Disclosure of Invention
The technical problem to be solved by the invention is to provide a sheath flow impedance counting device and a sheath flow impedance counting method, which can be used for disassembling a sample needle mounting part and a capturing tube mounting part, are convenient for cleaning and maintaining a gem hole, a sample needle, a capturing tube and front and rear pool inner cavities, and improve the maintainability; the dismouting is convenient, has improved assembly efficiency and sealing performance.
In order to solve the above technical problem, an embodiment of the present invention provides a sheath flow impedance counting apparatus, including: the device comprises a sample needle mounting part, a capturing tube mounting part, a front pool shell and a rear pool shell which are connected and fixed into a whole, wherein a counting assembly is arranged at the communication position of a front pool inner cavity of the front pool shell and a rear pool inner cavity of the rear pool shell; the sample needle is fixedly bonded in the through hole, and the tail part of the sample needle is connected with the tee joint which is communicated with the sample needle; the sample needle mounting part and/or the capturing tube mounting part are/is provided with a rotary buckle lug, the front pool shell and/or the rear pool shell are/is correspondingly provided with a rotary buckle seat, and the rotary buckle lug is matched, clamped and fixedly connected with the rotary buckle seat;
the sample needle mounting part is detachably fixed on the forepool shell to seal the forepool inner cavity, and the capture tube mounting part is detachably fixed on the rear pool shell to seal the rear pool inner cavity;
the rotary buckle lug is a flange structure which is arranged on a fixed seat of the sample needle installation part and/or the catching tube installation part in an extending way;
the spiral buckle seat is of a hollow groove structure arranged on the opening end of the inner cavity of the forebay and/or the inner cavity of the rear bay, the spiral buckle seat is provided with a notch for the spiral buckle lug to be screwed in, and the spiral buckle lug is screwed in the notch of the spiral buckle seat.
Preferably, an annular groove is arranged at the opening end of the inner cavity of the front pool and/or the inner cavity of the rear pool, and a sealing ring is arranged in the annular groove;
when the screwing lug is screwed into the screwing seat, the fixed seat extrudes the sealing ring to be hermetically connected on the opening end of the front pool inner cavity and/or the rear pool inner cavity.
Preferably, the sealing ring is an annular gasket structure with an O-shaped or square cross section.
Preferably, the fixing seat comprises an end head and an end cover which are integrally formed, the end head is butted on the inner wall of the front pool inner cavity and/or the rear pool inner cavity, and the end cover is abutted against the opening end of the front pool inner cavity and/or the rear pool inner cavity to seal the front pool inner cavity and/or the rear pool inner cavity;
the sealing ring is fastened at the joint of the end head and the end cover.
Preferably, the end of the rotary buckle lug is an arc surface, and two side bodies adjacent to the end of the rotary buckle lug are wedge surfaces.
Preferably, the inner wall of the screwing seat is provided with a bone position for preventing the screwing lug from reversely rotating and loosening.
Preferably, the bone site is a convex structure in any one of a semicircular shape, a triangular shape, a trapezoidal shape and a square shape.
The invention also discloses a sheath flow impedance counting method.
The sheath flow impedance counting device and the sheath flow impedance counting method provided by the invention are implemented, as the sample needle mounting part and/or the capturing tube mounting part are/is provided with the rotary buckle lugs, the front pool shell and/or the rear pool shell are/is provided with the rotary buckle seats, and the rotary buckle lugs are fixedly connected with the rotary buckle seats in a matched and clamped mode; the sample needle mounting part is detachably fixed on the forebay shell to seal the forebay inner cavity, and the capturing tube mounting part is detachably fixed on the rear bay shell to seal the rear bay inner cavity. Due to the adoption of the detachable structure, the gem hole, the sample needle and/or the capturing tube can be conveniently cleaned and replaced, and the front pool inner cavity and the rear pool inner cavity can be conveniently cleaned and maintained; the occurrence of the scrapping condition of the whole device caused by the failure of one or more components is avoided, the maintenance cost is reduced, and the assembly efficiency of the device is improved due to the reduction of bonding points; and the dismounting is convenient, the sealing performance is good, and the maintainability of the device is improved.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1 and 2 in combination, an embodiment of the present invention provides a sheath flow impedance counting apparatus, including: the device comprises a sample needle mounting part 1, a capturing tube mounting part 2, a front pool shell 3 and a rear pool shell 4 which are connected and fixed into a whole, wherein a counting assembly 5 is arranged at the communication position of a front pool inner cavity 31 of the front pool shell 3 and a rear pool inner cavity 41 of the rear pool shell 4, a rotary buckle lug 8 is arranged on the sample needle mounting part 1 and/or the capturing tube mounting part 2, a rotary buckle seat 9 is arranged on the front pool shell 3 and/or the rear pool shell 4, and the rotary buckle lug 8 is matched, clamped and connected with the rotary buckle seat 9;
the sample needle mounting part 1 is detachably fixed to the forecell casing 3 to seal the forecell inner chamber 31, and the trap tube mounting part 2 is detachably fixed to the rear cell casing 4 to seal the rear cell inner chamber 41.
The front tank shell 3 and the rear tank shell 4 are approximately square and are connected and fixed into a whole. In practice, the front tank shell 3 and the rear tank shell 4 may be connected by a conventional connection method such as bonding or screwing. In this embodiment, the two are connected as follows:
an accommodating groove 32 for fixing the counting assembly 5 is arranged at the other end opposite to the front pool inner cavity 31 of the front pool shell 3, and an outer convex annular wall 42 corresponding to the accommodating groove 32 is arranged at the other opposite side of the rear pool inner cavity 41 of the rear pool shell 4. The containing groove 32 and the outer convex annular wall 42 are respectively communicated with the front pool inner cavity 31 and the rear pool inner cavity 42, the outer diameter size of the outer convex annular wall 42 is equivalent to the inner diameter size of the containing groove 32, and the outer convex annular wall can be placed in the containing groove 32 to realize butt joint. Meanwhile, flanges 33 and 43 are arranged on the outer sides of the opposite connection end surfaces of the front tank shell 3 and the rear tank shell 4, fixing holes are arranged on the two flanges 33 and 43, and the front tank shell 3 and the rear tank shell 4 are connected by fastening the flanges 33 and 43 through screws 44. The accommodation groove 32 and the outer convex ring wall 42 are arranged on the front pool shell 3 and the rear pool shell 4, so that on one hand, the positioning effect can be realized in the connection process of the front pool shell 3 and the rear pool shell 4, the alignment of the fixing holes on the two flanges 33 and 43 is convenient, and the quick installation is realized; the positioning function of the front pool inner cavity 31 and the rear pool inner cavity 42 can be realized, so that the central axes of the front pool inner cavity and the rear pool inner cavity are on the same straight line, and the accuracy of the measurement of the instrument is ensured. On the other hand, the protruding wall 42 extending into the receiving groove 32 can also press and fix the counting assembly 5 therein.
The forebay shell 3 and the rear bay shell 4 further include a forebay inner cavity 31 and a rear bay inner cavity 32, the two inner cavities are cylindrical cavity structures (the cross section is circular), and the two inner cavities are respectively and oppositely narrowed at the respective bottoms and are in sealed communication and butt joint. After the front tank shell 3 and the rear tank shell 4 are fixed according to the installation mode of the front tank shell and the rear tank shell, the counting assembly 5 can be just arranged at the communicated butt joint part (between the accommodating groove 32 and the outer convex annular wall 42) of the front tank inner cavity 31 and the rear tank inner cavity 41.
In the preferred embodiment of the present invention, the open ends 312, 412 of the front tank inner chamber 31 and the rear tank inner chamber 42 are respectively provided with the annular grooves 314, 414, and the sealing rings 6 are arranged in the annular grooves 314, 414, when the screwing lug 8 is screwed into the screwing seat 9, the fixed seats 12, 22 press the sealing rings 6 to be connected to the open ends 312, 412 of the front tank inner chamber 31 and/or the rear tank inner chamber 41 in a sealing way. The seal ring 6 can provide an effect of enhancing the sealing performance when the sample needle mounting part 1 and the trap tube mounting part 2 are fixed to the front cell casing 3 and the rear cell casing 4, respectively. Preferably, the sealing ring 6 is a ring-shaped gasket structure with an O-shaped or square-shaped cross section. The specific assembly and sealing process will be described later.
The sample needle mounting part 1 is a structural member which is hermetically connected to the open end 312 of the forebay inner cavity 31 and has an axisymmetric structure. In a preferred embodiment of the present invention, the sample needle mounting part 1 includes a sample needle 11, a holder 12, and a tee joint 13. The fixing seat 12 comprises a head 122 and an end cover 124 which are integrally formed, and a through hole 126 which is arranged in the middle of the head 122 and the end cover 124 in a penetrating way; the sample needle 11 is bonded and fixed to the through hole 126, and a tee joint 13 communicating with the end of the sample needle 11 is connected to the end. The sample needle 11 is in the form of an elongated needle having a liquid flow channel disposed therein which narrows at one end at the outlet end (to the left as shown), and the opposite end is connected to a tee fitting 13 and is in liquid communication with the two components. The tip 122 and end cap 124 in this embodiment are integrally formed and are generally stepped frustoconical in shape. The main function of both structures is to secure the sample needle 11 and to seal off the forebay lumen 31. When the fixing base 12 is inserted into the forebay inner cavity 31, since the outer diameter of the tip 122 is the same as the inner diameter of the forebay inner cavity 31, the outer wall of the tip 122 presses (or contacts) the inner wall of the forebay inner cavity 31, and the end cap 124 extending from the tip 122 closes the open end 312 of the forebay inner cavity 31. When the fixing base 12 is completely clamped on the open end 312 of the front pool inner cavity 31, the annular groove 314 of the front pool inner cavity 31 is closed to form an annular hollow space. If the ring groove 314 is provided with the sealing ring 6, the end cover 124 of the fixing seat 12 can fasten the sealing ring (with a certain amount of compression deformation), so as to realize the sealing effect of the fixing seat 12 on the front pool inner cavity 31.
The axisymmetric structure of the sample needle mounting portion 1 in the present embodiment means: the central axes of sample needle 11 and holder 12 are collinear, and when sample needle mount 1 is fixed in anterior pool lumen 31, sample needle mount 1 can rotate along the common central axis of sample needle 11 and holder 12 during mounting without changing the position of sample needle 11 and holder 12 relative to anterior pool lumen 31, i.e., after fixation, the central axes of anterior pool lumen 31, sample needle 11, and holder 12 are collinear.
The trap pipe mounting part 2 is a structural member hermetically connected to the rear pool cavity 41, and is also of an axisymmetric structure. In the preferred embodiment of the present invention, the trap pipe mounting part 2 includes a trap pipe 21, a holder 22, and a rear cell electrode 23. The difference between the capturing tube mounting part 2 and the sample needle mounting part 1 is that the capturing tube 21 has a tubular structure surrounded by a fixing part 22, and the rear cell electrode 23 is fixed by the fixing base 22. The structure of the fixing seat 22 is similar to that of the fixing seat 12 of the sample needle mounting part 1, and mainly comprises a tip 222 and an end cover 224, which are integrally formed. When the retaining bracket 22 is placed in the rear tank interior 41, the outer wall of the tip 222 presses against (or contacts) the inner wall of the rear tank interior 41, and the end cap 224 closes the open end 412 of the rear tank interior 41. The axisymmetrical structure of the trap pipe mounting part 2 means: after the catching tube mounting part 2 is fixed on the rear pool shell 4, the central axes of the rear pool inner cavity 41, the catching tube 21 and the fixing seat 22 are on the same straight line, the catching tube mounting part 2 can rotate in the mounting process, and the relative positions of the catching tube 21 and the fixing seat 22 relative to the rear pool inner cavity 41 cannot be changed.
The preferred embodiment of the present invention is shown in fig. 3 and 4. The screwing lugs 8 are the same-structure components respectively arranged on the fixing seats 12 and 22 of the sample needle mounting part 1 and the catching tube mounting part 2, and the screwing seats 9 are the same-structure components respectively arranged on the front pool shell 3 and the rear pool shell 4. The structure and connection relationship of the rotary buckle ear 8 on the catching pipe mounting part 2 and the rotary buckle seat 9 on the rear pool shell 4 are described as follows:
the rotary buckle 8 is extended from the side of the end cap 224 of the fixing base 22 and is formed by two symmetrical flange structures. Because this spinner ear 8 is connected as an organic whole with fixing base 22, can reach the purpose of fastening fixing base 22 through the mode of this spinner ear 8 of extrusion. In this embodiment, the end 81 of the rotary buckle 8 is set to be a cambered surface, which reduces the area occupied by the rotary buckle 8 in the rotating process, so as to enable the rotary buckle to smoothly rotate and return. In a preferred embodiment, wedge surfaces 82 are provided on two side bodies adjacent to the end head 81, and the wedge surfaces 82 may be flat surfaces or arc surfaces, which function to facilitate the smooth guiding of the turnbuckle 8 into the turnbuckle seat 9 or the turning away of the turnbuckle 8 from the turnbuckle seat 9 during the assembling and disassembling process of the turnbuckle 8.
The screwing seat 9 is a hollow slotted structure arranged at the opening end of the forebay inner cavity 31 and/or the rear bay inner cavity 41 and is in a square shape. The screw seat 9 is fixed on the rear tank shell 4 and is located at the periphery of the opening end 412 of the rear tank chamber 41, and is also provided with two opposite symmetrical structures. The opening direction of the groove body of the screwing seat 9 is vertical to the direction of the opening end 412 of the inner cavity 41 of the rear tank. In this embodiment, the screwing seat 9 includes a notch 91 for screwing the screwing ear 8 in and a bone position 93 disposed on an inner wall 92 of the screwing seat 9 for preventing the screwing ear 8 from reversely rotating and loosening. The notch 91 is arranged on the side body of the screwing seat 9, the position of the notch 91 is approximately on the same horizontal plane with the position of the screwing lug 8 when the catching pipe mounting part 2 is placed in the rear pool inner cavity 41, the adjacent side of the notch 91 is a groove body with a vacant position, and the screwing lug 8 can be screwed into the screwing seat 9 through the notch 91; the bone 93 is a protrusion structure for preventing the reverse rotation and loosening of the screwing lug 8 screwed into the screwing seat 9, as shown in fig. 5. Preferably, the bony site 93 is a convex structure in any one of a semi-circular, triangular, trapezoidal, and square shape. In practice, after the screwing-buckling ear 8 is completely screwed through the bone position 93 and reaches the designated position, the protruded bone position 93 can clamp and fix the screwing-buckling ear 8.
The screwing lug 8 and the screwing seat 9 are matched, clamped and fixedly connected, which means that in specific implementation, the two screwing lugs 8 can be screwed into the groove bodies of the two corresponding screwing seats 9 through the notches 91, and after the screwing lugs 8 are all screwed through the bone positions 93 to reach the designated positions, the end surfaces of the two screwing lugs 8 are extruded on the inner walls 92 of the corresponding screwing seats 9, and extrusion surfaces 921 and 922 are respectively formed, wherein the screwing lugs 8 and the screwing seats 9 are clamped and fixedly connected. It should be noted that the pressing surfaces 921, 922 not only form the fastening between the fastening lug 8 and the fastening seat 9, but also the sealing ring 6 fastened at the joint between the end heads 122, 222 and the end caps 124, 224 plays a role in pressing: above-mentioned sealing washer 6 produces compression deformation back through the fastening of fixing base 12 end cover 124, and sealing washer 6 will generate the resilience force effect opposite with the effort direction on end cover 124, and the terminal surface of the spiral buckle ear 8 that sets up on fixing base 12 further pastes tight spiral buckle seat 9, increases the effort between the two, prevents to become flexible.
When the forecell shell 3 and the rear cell shell 4 are installed in a matching mode, the sample needle installation part 1 is fixed on the forecell shell 3 to seal the forecell inner cavity 31, and the capture tube installation part 2 is fixed on the rear cell shell 4 to seal the rear cell inner cavity 41, so that the sheath flow impedance counting device can be operated to operate. The counting assembly 5 is located at the communication position of the front cell inner cavity 31 of the front cell shell 3 and the rear cell inner cavity 41 of the rear cell shell 4, and is fixed by the extrusion between the accommodating groove 32 and the outer convex annular wall 42 which are arranged on the two shells respectively, and is a structural member for counting the tiny particles contained in the sample liquid.
The counting assembly 5 comprises a forebay gasket 51, a jewel hole 52 and a jewel hole gasket 53 which are connected in sequence. Wherein the front pool gasket 51 is provided at a side close to the front pool housing 3. The counting assembly 5 counts the tiny particles in the sample liquid according to the following principle: since the sample liquid containing fine particles passes through the jewel hole 52, and the sample liquid is a good electrical conductor, such as a bad electrical conductor, when the particles pass through the jewel hole 51, the electrical resistance at the two sides of the jewel hole 51 is significantly greater than that at the two sides of the jewel hole 51 when no particle passes through the jewel hole 51, and at this time, the information about the particles can be obtained by detecting the electrical signal generated by the change of the electrical resistance between the front cell inner cavity 31 and the rear cell inner cavity 41.
The invention implements the detachable connection of the sample needle mounting part 1 and the front pool shell 3 and the detachable connection of the capture tube mounting part 2 and the rear pool shell 4 by the matching clamping and fixing connection of the rotary buckle ear 8 and the rotary buckle seat 9 as follows: first, the rear cell electrode 23 is connected and fixed to the trap tube 21, and the holder 22 to which the trap tube 21 is fixed is connected to the rear cell case 4. Specifically, the front end of the fixing base 22 is inserted into the rear tank inner cavity 41, the outer wall of the tip 222 presses (or contacts) the inner wall of the rear tank inner cavity 41, and the end cap 224 is attached to the open end 412 of the rear tank inner cavity 41. Next, towards detaining seat 9 soon and setting up the clockwise or anticlockwise rotation of direction of breach 91 and fixing seat 22, owing to catch pipe installation department 2 and be the axisymmetric structure, fixed seat 22 rotation in-process can not change and catch pipe 21 and fixing seat 22 for the relative position of rear pool inner chamber 41, catch pipe 21 and keep the coincidence with rear pool inner chamber 41 the central axis all the time. As the screw is screwed, the screwing lug 8 is screwed into the screwing seat 9 through the notch 91. In the process, the cambered surface end 81 and the wedge surface 82 arranged on the screwing lug 8 enable the screwing lug 8 to smoothly rotate and return, and after the screwing lug 8 completely rotates through the bone position 93 and reaches a designated position, the end surfaces of the two screwing lugs 8 are extruded on the inner wall 92 of the corresponding screwing seat 9. When the fixing base 22 is completely fastened to the opening end 412 of the rear pool inner cavity 41, the end cap 124 of the fixing base 22 fastens the sealing ring 6 in the ring groove 414 (has a certain amount of compression deformation), so as to seal the rear pool inner cavity 41 by the fixing base 22, and the bone position 93 fastens and fixes the turnbuckle 8.
The sample needle mounting part 1 and the front cell housing 3 are detachably connected in the same manner as the above-described trap tube mounting part 2 and the rear cell housing 4. The assembled sheath flow impedance counting device can be used for counting according to the counting process.
When the sample needle 11, the capturing tube 21 and/or the counting assembly 5 need to be cleaned or replaced, the sample needle, the capturing tube 21 and/or the counting assembly 5 can be disassembled in a reverse manner according to the assembling process, and when the screwing lug 8 jumps off the bone position 93 on the inner wall 92 of the screwing seat 9 and is screwed out from the notch 91 of the screwing seat 9, the fixing seats 12 and 22, together with the sample needle 11 and/or the capturing tube 21, are separated from the front pool shell 3 and/or the rear pool shell 4. In the process of replacing the sample needle 11 and the capturing tube 21, the front cell inner cavity 31 and the rear cell inner cavity 41 can be cleaned, bubbles or other particles in the front cell inner cavity 31 or the rear cell inner cavity 41 can be removed, preparation is made for the next detection, and the counting accuracy is ensured.
The sheath flow impedance counting device of the present invention further comprises a plurality of connectors 7 communicating with the front cell inner chamber 31 and the rear cell inner chamber 41, such as a front sheath electrode connector 71, a cleaning tube connector 72, and a rear sheath inlet tube connector 73. The included angle between the central axis of any joint 7 and the central axis of the front pool inner cavity 31 or the rear pool inner cavity 41 is smaller than 90 degrees, namely the joint and the inner cavity are in a non-vertical state, and the cleaning liquid can be smoothly discharged from the inner cavity when the front pool inner cavity 31 and the rear pool inner cavity 41 are cleaned, so that the cleaning efficiency is improved.
The second embodiment of the present invention is different from the above-described structure in that: the above-structured screwing lug 8 is mounted only on the sample needle mounting part 1, and the above-structured screwing holder 9 is mounted on the forepool housing 3. The sample needle mounting part 1 is detachably connected and fixed on the forepool shell 3 through the clamping and fixing connection of the rotary buckle ear 8 and the rotary buckle seat 9. The catching pipe mounting part 2 and the rear tank case 4 may be connected by a common adhesive or a common screw, or may be implemented.
The third embodiment of the present invention is different from the above-described structure in that: the above-structured screwing lug 8 is mounted only on the trap pipe mounting part 2, and the above-structured screwing seat 9 is mounted on the rear pool housing 4. The catching pipe mounting part 2 is detachably connected and fixed on the rear pool shell 4 through the clamping and fixing connection of the rotary buckle ear 8 and the rotary buckle seat 9. The sample needle mounting part 1 and the cuvette housing 3 can be connected by common adhesive or screws without affecting the implementation.
As a variation of the above three preferred embodiments, the fastening lug 8 and the fastening seat 9 may be mounted by a snap-fit connection, instead of the above-mentioned snap-fit connection. For example, during the installation process, the turnbuckle seat 9 can be deformed (restored) to a certain extent by the action of external force, so that a space is formed between the turnbuckle seat and the turnbuckle seat, and the turnbuckle ear 8 can be placed in the groove body. After the placement is finished, the external force action is cancelled, the rotary buckle seat 9 resets, the groove body is clamped and fixed with the rotary buckle lug 8, the installation is finished, and the dismounting process is reversed. The structure does not change the essence of the clamping connection of the two. Meanwhile, in this embodiment, the end 81 of the screwing lug may not be a cambered surface, and may not be provided with the wedge surface 82; the corresponding spinner seat 9 can also be provided with no gap 91 and no bone position 93, and the implementation is not influenced.
In other embodiments of the sheath flow impedance counting device of the present invention, the mounting positions of the screwing lug and the screwing seat are not limited to the above embodiments, and the screwing seat 9 may be provided on the sample needle mounting part 1 and/or the capturing tube mounting part 2, the screwing lug 8 is provided on the front tank shell 3 and/or the rear tank shell 4, and the detachable fastening connection mode of the screwing lug 8 and the screwing seat 9 is not changed; meanwhile, the number of the fastening lugs 8 and the fastening seats 9 is not limited to two in the above embodiments, and may be adjusted according to the size of the device and the sealing strength, such as more than two. The screwing lug 8 and the screwing seat 9 can be matched, clamped and fixedly connected.
The invention also discloses a sheath flow impedance counting method, which comprises the following steps:
cleaning a front pool inner cavity and a rear pool inner cavity of the sheath flow impedance counting device;
a step of passing the sample liquid through the counting assembly 5;
and detecting an electric signal generated between the front cell inner cavity 31 and the rear cell inner cavity 41 due to the change of the resistance to acquire information related to the particles. Wherein,
the step of cleaning the front pool inner cavity and the rear pool inner cavity of the sheath flow impedance counting device comprises the following steps:
screwing the fixing seats 12 and 22 on the sample needle mounting part 1 and/or the catching tube mounting part 2, wherein the fixing seats 12 and 22 rotate coaxially with the sample needle 11 and/or the catching tube 21 and the screwing lug 8 on the fixing seats;
the screwing ear 8 trips out of a bone position 93 on the inner wall 92 of the screwing seat 9 and is screwed out from a gap 91 of the screwing seat 9, and the fixed seats 12 and 22, together with the sample needle 11 and/or the capture tube 21, are separated from the front pool shell 3 and/or the rear pool shell 4;
cleaning or replacing the sample needle 11, the capture tube 21 and/or the counting assembly 5;
screwing the sample needle mounting part 1 and/or the catching tube mounting part 2 to connect the screwing lug 8 on the sample needle mounting part with the screwing seat 9 on the front pool shell 3 and/or the rear pool shell 4 in a matching and screwing way. The implementation of the sheath flow impedance counting method according to the embodiment of the present invention is the same as the implementation of the sheath flow impedance counting apparatus, and is not described again.
The sheath flow impedance counting device and the sheath flow impedance counting method are implemented, as the sample needle mounting part and/or the capturing tube mounting part are/is provided with the rotary buckle lugs, the front pool shell and/or the rear pool shell are/is provided with the rotary buckle seats, and the rotary buckle lugs are fixedly connected with the rotary buckle seats in a matched and clamped mode; the sample needle mounting part is detachably fixed on the forebay shell to seal the forebay inner cavity, and the capturing tube mounting part is detachably fixed on the rear bay shell to seal the rear bay inner cavity. Due to the adoption of the detachable structure, the gem hole, the sample needle and/or the capturing tube can be conveniently cleaned and replaced, and the front pool inner cavity and the rear pool inner cavity can be conveniently cleaned and maintained; the occurrence of the scrapping condition of the whole device caused by the failure of one or more components is avoided, the maintenance cost is reduced, and the assembly efficiency of the device is improved due to the reduction of bonding points; and the dismounting is convenient, the sealing performance is good, and the maintainability of the device is improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.