CN112903178A - Oil-immersed pressure sensor - Google Patents

Abstract

The application relates to an oil-immersed pressure sensor, which comprises a shell, a capsule, a circuit board and a pressing piece; the inner part of the shell is hollow, an annular edge is arranged on the inner wall of the shell, and the annular edge divides the inner cavity of the shell into a sealing cavity and a detection cavity; the utricule is put into and is detected in the chamber and the border of utricule is contradicted on annular edge, compress tightly piece and circuit board and all set up in the sealed chamber of casing, compress tightly the piece and be used for compressing tightly the circuit board on the utricule and the utricule compresses tightly on annular edge, liquid oil is filled between utricule and the circuit board. Through the setting of utricule in this application to avoid external water etc. direct and circuit board contact, in order to improve this oil-immersed pressure sensor's life.

Description

Oil-immersed pressure sensor

Technical Field

The application relates to the field of sensors, in particular to an oil-immersed pressure sensor.

Background

A pressure sensor is the most common sensor in industrial practice, and is generally composed of a pressure sensitive element and a signal processing unit, so that the pressure sensor is a device or apparatus capable of sensing a pressure signal and converting the pressure signal into a usable output electric signal according to a certain rule.

Chinese patent with the current publication number of CN206945209U discloses a pressure sensor assembly structure, which comprises a circuit board, the screw thread clamping ring, grafting complex plug connector and casing, the upper portion of casing sets up the tube-shape cavity, the inner wall at this tube-shape cavity middle part sets up the internal thread, the outer wall setting of screw thread clamping ring and internal thread matched with external screw thread, the bottom in the tube-shape cavity is arranged in to the circuit board during assembly, screw thread clamping ring and tube-shape cavity screw-thread fit, the screw thread clamping ring carries on spacingly to the circuit board, form sealed chamber between circuit board up end and the screw thread clamping ring inner chamber, form the detection chamber under the circuit board between terminal surface.

Therefore, gas or liquid enters the detection cavity to be in contact with the sensor on the circuit board, and the pressure of the gas or liquid is detected, but the gas or liquid is in direct contact with the sensor on the circuit board, so that the service life of the pressure sensor is easily influenced.

Disclosure of Invention

In order to improve life, this application provides an oil-immersed pressure sensor.

The application provides an oily formula pressure sensor adopts following technical scheme:

an oil-immersed pressure sensor comprises a shell, a capsule, a circuit board and a pressing piece;

the inner part of the shell is hollow, an annular edge is arranged on the inner wall of the shell, and the annular edge divides the inner cavity of the shell into a sealing cavity and a detection cavity;

the utricule is put into and is detected in the chamber and the border of utricule is contradicted on annular edge, compress tightly piece and circuit board and all set up in the sealed chamber of casing, compress tightly the piece and be used for compressing tightly the circuit board on the utricule and the utricule compresses tightly on annular edge, liquid oil is filled between utricule and the circuit board.

Through adopting above-mentioned technical scheme, the utricule is put into the detection chamber from the sealed chamber of casing, the border of utricule is contradicted on the annular edge, the circuit board is arranged in on the utricule, sensor on the circuit board is towards utricule one side, liquid oil is filled between utricule and the circuit board, it compresses tightly the circuit board on the utricule to compress tightly the piece, and then can compress tightly the utricule on the annular edge, therefore, use the oily formula pressure sensor of this application, if install oily formula pressure sensor on the water pump, the water in the water pump is introduced into and is detected the chamber, the utricule can transmit the pressure that receives for the sensor on the circuit board and then realize the detection of pressure through the setting of utricule, thereby avoid direct and circuit board contact such as external water, in order.

Optionally, an internal thread is arranged on the cavity wall of the housing sealing cavity, and an external thread matched with the internal thread is arranged on the compressing member, or;

the wall of the shell sealing cavity is provided with a clamping groove, and the pressing piece is a clamping spring which is mutually clamped and embedded with the clamping groove.

By adopting the technical scheme, the pressing piece is installed on the sealing cavity of the shell in a threaded mode, so that the circuit board can be gradually pressed on the capsule body by the pressing piece, and the capsule body is pressed on the annular edge, so that the tightness between the capsule body and the annular plate and between the circuit board and the capsule body are ensured;

the clamp spring is used as the pressing piece, the clamp spring is embedded in the clamping groove, the circuit board can be pressed on the bag body through the clamp spring, the pressing piece adopts the design of the clamp spring, the structure is simpler, the processing convenience is high, and the processing cost is low.

Optionally, the sealing cavity is filled with epoxy resin, and the housing is provided with an end cover for closing the sealing cavity through threads.

Through adopting above-mentioned technical scheme, the end cover seals the seal chamber opening, and epoxy is used for filling whole seal chamber to ensure the leakproofness of seal chamber, compress tightly the fastening nature of a compact disc circuit board, also avoid the liquid oil infiltration in the utricule to seal chamber, improve the detection precision of circuit board to pressure.

Optionally, an extension groove is arranged at a joint between the cavity wall of the shell sealing cavity and the annular edge, and the extension groove is used for accommodating the edge of the capsule body.

Through adopting above-mentioned technical scheme, the border at the utricule is compressed tightly the back by the circuit board, because the border of utricule has certain ductility, consequently, the utricule will extend to the chamber wall of seal chamber, if do not have the setting of extending groove, the border of utricule will produce certain warpage after the chamber wall of seal chamber blocks, because the utricule receives the pressure of each direction in detecting the chamber, the border of utricule is dragged, cause easily that certain clearance produces between utricule border and the annular limit, influence the detection precision of sensor to pressure in the circuit board.

Optionally, the extension groove comprises a first ring groove formed in the wall of the sealing cavity of the shell and a second ring groove formed in the annular edge, and the first ring groove and the second ring groove are communicated with each other.

By adopting the technical scheme, the first ring groove is arranged on the wall of the sealing cavity, the second ring groove is arranged on the annular edge, therefore, the edge of the bag body is firstly embedded into the first ring groove after being extended, then the bag body is blocked by the first ring groove and is embedded into the second ring groove, therefore, the edge of the bag body forms a folding state, thereby the second ring groove realizes the limit fixation of the edge of the bag body, the contact tightness between the edge of the bag body and the ring-shaped edge is better, therefore, after the capsule body is pressed in all directions in the detection cavity, the edge of the capsule body is not easy to pull, the liquid oil in the capsule body is not easy to leak, and the liquid oil is not easy to seep out through the layer-by-layer sealing between the second ring groove and the edge of the capsule body, therefore, through the arrangement of the first ring groove and the second ring groove, the detection precision of the oil-immersed pressure sensor on the pressure is ensured.

Optionally, the groove depth of the first ring groove is 1mm, and the groove depth of the second ring groove is 0.5 mm.

Through adopting above-mentioned technical scheme, the groove depth setting of above-mentioned first annular and second annular can make the utricule border after the extension fully enter into first annular and second annular to with the compactness of being connected between first annular and the second annular better.

Optionally, a chamfer is provided at a position of the annular edge near the balloon body.

Through adopting above-mentioned technical scheme, when the utricule received the pressure of each direction in detecting the chamber, will produce great friction between the border on utricule and annular limit, through the setting of chamfer, can reduce the injury of annular border to the utricule outer wall face.

Optionally, when the capsule is placed in the detection cavity, the outer wall surface of the capsule is abutted against the inner ring wall surface of the annular edge.

Through adopting above-mentioned technical scheme, the outer wall of utricule is inconsistent with the inner ring wall on annular limit, from this, the water in the detection chamber only is used in the utricule part that is located the detection chamber, is difficult for entering into on the contact surface on utricule border and annular limit.

Optionally, the liquid oil is silicone oil.

Through adopting above-mentioned technical scheme, silicon oil can be effectively transmit the pressure that the utricule received to the sensor on the circuit board.

Optionally, the capsule body is made of fluorosilicone rubber.

By adopting the technical scheme, the fluorosilicone rubber has better corrosion resistance and flexibility, and the rebound force after being compressed.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the oil-immersed pressure sensor, due to the arrangement of the bag body, external water bodies and the like are prevented from being directly contacted with the circuit board, and the service life of the oil-immersed pressure sensor is prolonged;

2. the setting of first annular and second annular in this application for the utricule border is drawn in spacingly, thereby the utricule receives the pressure of each direction in detecting the chamber and makes the border of utricule pulled, also is difficult for causing the utricule border and annular to produce the clearance between the limit, thereby ensures the detection precision of sensor to pressure on the circuit board.

Drawings

FIG. 1 is a schematic diagram of an oil-immersed pressure sensor;

FIG. 2 is an exploded schematic view of an oil immersed pressure sensor;

FIG. 3 is a cross-sectional view of an oil-immersed pressure sensor;

FIG. 4 is a schematic view showing the installation of the pressing member in the present embodiment;

figure 5 is a schematic view of the bladder installation in the present embodiment;

FIG. 6 is a schematic view showing the structure of another embodiment of the pressing member of the present embodiment;

fig. 7 is a schematic view showing the installation of another embodiment of the pressing member in this embodiment.

Description of reference numerals: 1. a housing; 2. a capsule body; 3. a circuit board; 31. a sensor; 4. a compression member; 5. an installation section; 6. an annular edge; 7. sealing the cavity; 8. a detection chamber; 9. a drainage duct; 10. a wire; 11. liquid oil; 12. an epoxy resin; 13. an end cap; 14. an extension groove; 141. a first ring groove; 142. a second ring groove.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

Referring to fig. 1, the oil-immersed pressure sensor includes ahousing 1, acapsule 2, acircuit board 3, and apressing member 4. Use the oil-immersed pressure sensor of this application,utricule 2 can transmit the pressure that receives forsensor 31 on thecircuit board 3 and then realize the detection of pressure throughliquid oil 11, through the setting ofutricule 2 to avoid direct andcircuit board 3 contacts such as external water, in order to improve this oil-immersed pressure sensor's life.

Specifically, thecasing 1 is cylindrical as a whole, and both ends of thecasing 1 are open and the inside of thecasing 1 is hollow. Wherein, casing 1's one end isinstallation section 5, is provided with the external screw thread oninstallation section 5, andcasing 1 can be installed on the equipment or the device that correspond through the external screw thread ofinstallation section 5 by the screw thread, and in an embodiment, the oily formula pressure sensor in this application uses in the water pump field, andcasing 1'sinstallation section 5 is used for the screw thread to install on the water pump to the realization detects the water pressure of water pump.

Referring to fig. 2 and 3, the inner wall of thehousing 1 is provided with anannular edge 6, and theannular edge 6 is located at the middle position of thehousing 1. In this embodiment, theannular rim 6 is integrally formed on the inner wall of thehousing 1. Through the setting ofannular limit 6,annular limit 6 separates intoseal chamber 7 anddetection chamber 8 with the inner chamber ofcasing 1, and sealchamber 7 anddetection chamber 8 communicate each other.

The sealingcavity 7 is far away from one side of the mountingsection 5 of theshell 1, and the sealingcavity 7 is communicated with the end face of theshell 1. Thedetection cavity 8 is close to one side of theinstallation section 5 of theshell 1, and theshell 1 is provided with adrainage channel 9 on theinstallation section 5, so that the end surface of theinstallation section 5 of theshell 1 is communicated with thedetection cavity 8 inside theshell 1 through thedrainage channel 9.

Utricule 2 adopts fluorine silicon rubber, in order to pass through mould injection moulding,utricule 2 wholly is the semicircle sphere, utricule 2's one end opening,utricule 2 has the border around the opening round, from this,utricule 2 is from putting into when detecting thechamber 8 in the sealedchamber 7,utricule 2's outer wall is inconsistent with the inner ring wall ofannular edge 6,utricule 2's border is contradicted onannular edge 6, thereby makeutricule 2 embedding install the middle part position atcasing 1.

Wherein, 6 departments that are close toutricule 2 on annular limit are provided with the chamfer, through the setting of chamfer, can reduce the injury of 6 borders on annular limit to 2 outer wall faces of utricule.

Thecircuit board 3 is disposed in the sealedcavity 7 of thehousing 1, thecircuit board 3 is closely attached to thecapsule 2, thecircuit board 3 is provided with asensor 31, thesensor 31 faces one side of thecapsule 2 and is located in an opening of thecapsule 2, and aliquid oil 11 is filled between thecapsule 2 and thecircuit board 3, in this embodiment, theliquid oil 11 is silicone oil. Wherein, thecircuit board 3 is provided with a lead 10, the lead 10 passes through the sealedcavity 7 of theshell 1 and is led out from the opening of the sealedcavity 7,

thepressing piece 4 is installed in the sealingcavity 7 of theshell 1, thepressing piece 4 is in contact with thecircuit board 3, thepressing piece 4 is used for pressing thecircuit board 3 on thecapsule body 2, and then thepressing piece 4 can press the edge of thecapsule body 2 on theannular edge 6.

In one embodiment, referring to fig. 4 and 5, the compressingelement 4 is connected with the sealedcavity 7 of thehousing 1 in a threaded manner, that is, an internal thread is provided on the wall of the sealedcavity 7 of thehousing 1, the compressingelement 4 is arranged in a ring shape, and an external thread matched with the internal thread is provided on the compressingelement 4.

From this, compress tightly the mode thatpiece 4 installed on 1 sealedchamber 7 of casing through the screw thread, compress tightlypiece 4 can compress tightlycircuit board 3 onutricule 2 gradually, and then compress tightly the border ofutricule 2 onannular edge 6, ensure the compactness betweenutricule 2 and annular board,circuit board 3 andutricule 2,liquid oil 11 betweenutricule 2 and thecircuit board 3 can not ooze fromutricule 2.

In another embodiment, referring to fig. 6 and 7, a clamping groove is formed in a wall of the sealedcavity 7 of thehousing 1, the pressingmember 4 is a clamp spring which is in clamping fit with the clamping groove, and a gasket is further arranged between the clamp spring and thecircuit board 3 and used for reducing damage caused when the clamp spring presses thecircuit board 3. It is worth to be noted that the clamping groove is arranged at a specific position on the wall of the sealedcavity 7 of theshell 1, after thecapsule 2, thecircuit board 3 and the gasket are installed, when the clamp spring is placed on the gasket, the clamp spring can be opposite to the clamping groove by providing downward pressing force of the clamp spring, and the clamp spring can be clamped into the clamping groove so as to press thecircuit board 3. Consequently, compress tightly 4 and be the jump ring, through the jump ring gomphosis in the draw-in groove, the jump ring can compress tightlycircuit board 3 on the utricule, compresses tightly 4 designs that adopt the jump ring, and the structure is simpler, and the processing convenience is high, and the processing cost is low.

From this, if install oily formula pressure sensor on the water pump, duringdetection chamber 8 is introduced to the water in the water pump,utricule 2 can transmit the pressure that receives forsensor 31 oncircuit board 3 throughliquid oil 11, and then realizes the detection of pressure, through the setting ofutricule 2 to avoid direct andcircuit board 3 contacts such as external water, in order to improve this oily formula pressure sensor's life.

In order to realize the sealing of thepressing piece 4 and thecircuit board 3 in the sealingcavity 7, the sealingcavity 7 is filled withepoxy resin 12, theepoxy resin 12 is blackepoxy resin 12, anend cover 13 for sealing the sealingcavity 7 is installed on theshell 1 in a threaded manner, and theend cover 13 and thepressing piece 4 share the internal thread of the inner wall of the sealingcavity 7 of theshell 1. It should be noted that, the middle portion of theend cap 13 is provided with a through hole for thewire 10 of thecircuit board 3 to pass through, and after thesealing cavity 7 of thehousing 1 is filled with theepoxy resin 12, theepoxy resin 12 can fill the gap between the through hole of theend cap 13 and thewire 10 of thecircuit board 3 to ensure sealing.

Because, the border ofutricule 2 is compressed tightly the back bycircuit board 3, and the border ofutricule 2 will produce certain extension, for the compactness of being connected between ensureing utricule 2 border andannular edge 6, this application will carry out following improvement to the structure oncasing 1 installation cavity andannular edge 6.

Specifically, as shown in fig. 4 and 5, anextension groove 14 is disposed at a joint between a cavity wall of the sealingcavity 7 of thehousing 1 and theannular edge 6, theextension groove 14 is used for accommodating an edge of thecapsule 2, theextension groove 14 includes a firstannular groove 141 opened on the cavity wall of the sealingcavity 7 of thehousing 1 and a secondannular groove 142 opened on theannular edge 6, the firstannular groove 141 and the secondannular groove 142 are communicated with each other, the firstannular groove 141 extends in a radial direction of thehousing 1, and the secondannular groove 142 extends in an axial direction of thehousing 1, in an embodiment, a groove depth of the firstannular groove 141 is 1mm, and a groove depth of the secondannular groove 142 is 0.5 mm. Thus, the first andsecond ring grooves 141 and 142 are formed in an L-shaped cross section.

Therefore, after the edge of thecapsule body 2 is abutted against theannular edge 6, the edge of thecapsule body 2 is embedded in the firstannular groove 141, after thecircuit board 3 is pressed on thecapsule body 2 by thepressing piece 4, the edge of thecapsule body 2 generates a certain extension, since the upper surface of the rim of thecapsule 2 is blocked by thefirst ring groove 141, the rim of thecapsule 2 is inserted into thesecond ring groove 142, therefore, the edge of thecapsule 2 is folded, on one hand, the secondannular groove 142 realizes the limit fixation of the edge of thecapsule 2, the contact tightness between the edge of thecapsule 2 and theannular edge 6 is better, after thecapsule 2 is pressed in all directions in thedetection cavity 8, the edge of thecapsule body 2 is not easy to pull, theliquid oil 11 in thecapsule body 2 is not easy to leak, and on the other hand, theliquid oil 11 is not easy to leak out from the space between thecapsule body 2 and theannular edge 6 through the layer-by-layer sealing between the secondannular groove 142 and the edge of thecapsule body 2. Accordingly, thefirst ring groove 141 and thesecond ring groove 142 are provided, so that stability of theliquid oil 11 in thebladder 2 after being pressurized is ensured, and detection accuracy of the oil-immersed pressure sensor for pressure in the present application is ensured.

Throughutricule 2's setting in this application to avoid direct andcircuit board 3 contacts such as external water, with improve this oil-immersed pressure sensor's life.

Moreover, the setting of firstannular groove 141 and secondannular groove 142 in this application for 2 borders of utricule are drawn in spacingly, thereby utricule 2 receives the pressure of each direction in detectingchamber 8 and makes the border ofutricule 2 pulled, also is difficult for causing the border ofutricule 2 and theannular edge 6 between to produce the clearance, thereby ensuressensor 31 on thecircuit board 3 to the detection precision of pressure.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

Translated fromChinese

1.一种油浸式压力传感器，其特征在于，包括壳体(1)、囊体(2)、电路板(3)和压紧件(4)；1. An oil-immersed pressure sensor, characterized in that it comprises a housing (1), a capsule (2), a circuit board (3) and a pressing member (4);所述壳体(1)内部呈中空设置，所述壳体(1)的内壁上设置有环形边(6)，所述环形边(6)将壳体(1)的内腔分隔成密封腔(7)和检测腔(8)；The interior of the housing (1) is hollow, an annular edge (6) is provided on the inner wall of the housing (1), and the annular edge (6) divides the inner cavity of the housing (1) into a sealed cavity (7) and the detection cavity (8);所述囊体(2)置入到检测腔(8)中且囊体(2)的边沿抵触在环形边(6)上，所述压紧件(4)和电路板(3)均设置在壳体(1)的密封腔(7)中，所述压紧件(4)用于将电路板(3)压紧在囊体(2)上及囊体(2)压紧在环形边(6)上，所述囊体(2)与电路板(3)之间填充液状油(11)。The capsule body (2) is placed in the detection cavity (8), the edge of the capsule body (2) is in contact with the annular edge (6), and the pressing member (4) and the circuit board (3) are both arranged on the In the sealed cavity (7) of the housing (1), the pressing member (4) is used for pressing the circuit board (3) on the capsule body (2) and pressing the capsule body (2) on the annular edge ( 6), the liquid oil (11) is filled between the bladder (2) and the circuit board (3).2.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述壳体(1)密封腔(7)的腔壁上设置有内螺纹，所述压紧件(4)上设置有与内螺纹配合的外螺纹，或；2. An oil-immersed pressure sensor according to claim 1, characterized in that, an inner thread is provided on the cavity wall of the sealing cavity (7) of the casing (1), and the pressing member (4) There is an external thread matched with the internal thread, or;所述壳体(1)密封腔(7)的腔壁上设置有卡槽，所述压紧件(4)为与卡槽相互卡嵌配合的卡簧。A clamping groove is provided on the cavity wall of the sealing cavity (7) of the casing (1), and the pressing member (4) is a clamping spring which is interlocked with the clamping groove.3.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述密封腔(7)内填充有环氧树脂(12)，所述壳体(1)上螺纹安装有用于封闭密封腔(7)的端盖(13)。3. An oil-immersed pressure sensor according to claim 1, characterized in that the sealing cavity (7) is filled with epoxy resin (12), and the shell (1) is threadedly mounted with a The end cap (13) that closes the sealing chamber (7).4.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述壳体(1)密封腔(7)的腔壁与环形边(6)之间的衔接处设置有延伸槽(14)，所述延伸槽(14)用于容纳囊体(2)的边沿。4. An oil-immersed pressure sensor according to claim 1, characterized in that, the joint between the cavity wall of the sealing cavity (7) of the casing (1) and the annular edge (6) is provided with an extension A groove (14), the extending groove (14) is used for accommodating the edge of the bag body (2).5.根据权利要求4所述的一种油浸式压力传感器，其特征在于，所述延伸槽(14)包括开设在壳体(1)密封腔(7)腔壁上的第一环槽(141)、以及开设在环形边(6)上的第二环槽(142)，所述第一环槽(141)和第二环槽(142)相互连通。5. An oil-immersed pressure sensor according to claim 4, characterized in that the extension groove (14) comprises a first annular groove ( 141), and a second annular groove (142) formed on the annular edge (6), the first annular groove (141) and the second annular groove (142) communicate with each other.6.根据权利要求5所述的一种油浸式压力传感器，其特征在于，所述第一环槽(141)的槽深为1mm，所述第二环槽(142)的槽深为0.5mm。The oil-immersed pressure sensor according to claim 5, wherein the groove depth of the first annular groove (141) is 1 mm, and the groove depth of the second annular groove (142) is 0.5 mm mm.7.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述环形边(6)靠近囊体(2)处设置有倒角。7 . The oil-immersed pressure sensor according to claim 1 , wherein the annular edge ( 6 ) is provided with a chamfer near the capsule body ( 2 ). 8 .8.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述囊体(2)置入到检测腔(8)中时，所述囊体(2)的外壁面与环形边(6)的内环壁面相抵触。8. An oil-immersed pressure sensor according to claim 1, characterized in that, when the capsule body (2) is placed in the detection cavity (8), the outer wall surface of the capsule body (2) is the same as the outer wall surface of the capsule body (2). The inner ring walls of the annular edge (6) are in contact with each other.9.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述液状油(11)为硅油。9 . The oil-immersed pressure sensor according to claim 1 , wherein the liquid oil ( 11 ) is silicone oil. 10 .10.根据权利要求1所述的一种油浸式压力传感器，其特征在于，所述囊体(2)采用氟硅橡胶。10 . The oil-immersed pressure sensor according to claim 1 , wherein the capsule body ( 2 ) is made of fluorosilicone rubber. 11 .

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