Disclosure of Invention
The invention aims to overcome the technical defects, and provides a self-priming pump which solves the technical problems that in the prior art, a self-priming centrifugal pump is connected with a motor and an impeller through a coupling, has large volume and weight and is easy to cause abnormal vibration due to poor centering of a shaft system.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
The invention provides a self-priming pump, comprising:
The pump shell is provided with a cavity and a suction flow passage positioned in the cavity, a driving cavity is concavely arranged on the outer wall surface of the pump shell towards the cavity, the driving cavity and the suction flow passage are sequentially communicated, the cavity and the suction flow passage are respectively provided with a communication port communicated with the outside, and one side of the driving cavity far away from the cavity is opened;
an impeller axially rotatably disposed in the driving chamber and capable of driving fluid to sequentially flow through the suction flow passage, the driving chamber and the chamber body when rotated, and
And the shell cover of the driving motor is arranged at the opening of the driving cavity, and the rotating shaft of the driving motor extends into the driving cavity from the inside of the shell and is connected with the impeller to drive the impeller to rotate around the axial direction of the impeller.
In some embodiments, the driving motor further comprises a rotor and two groups of stators, wherein the rotor is located in the casing and sleeved on the periphery of the rotating shaft, and the two groups of stators are mounted on the inner wall of the casing and located on two sides of the rotor in the axial direction.
In some embodiments, stator cavities are arranged at two ends of the casing in the axial direction, an annular partition plate is arranged on the inner wall of each stator cavity, close to one end of the rotating shaft, towards the other stator cavity in an extending mode, two groups of stators are respectively arranged in the two groups of stator cavities, and a gap is reserved between the rotor and each stator;
The driving motor further comprises two groups of bearings and two groups of stator sealing cover plates, wherein the two groups of bearings are respectively arranged between the two annular partition plates and the rotating shaft, and the two groups of stator sealing cover plates are respectively covered at one ends, close to the other annular partition plates, of the two annular partition plates.
In some embodiments, the rotating shaft and the casing are spaced apart from the side wall of the cavity to form an overcurrent gap, and a backflow channel is axially arranged along the backflow gap, and the backflow channel is communicated with the overcurrent gap and the driving cavity.
In some embodiments, a transparent window is disposed on a side of the flow gap away from the cavity, the transparent window being opposite to the rotating shaft.
In some embodiments, the rotor comprises a supporting ring, two groups of permanent magnets, two groups of rotor cores and two rotor sealing cover plates, wherein the supporting ring is sleeved on the periphery of the rotating shaft and is positioned between the two annular partition plates, mounting grooves are respectively concavely formed on two sides of the supporting ring in the axial direction, the two groups of permanent magnets and the two groups of rotor cores are respectively arranged on the two mounting grooves, the two rotor sealing cover plates cover openings of the two mounting grooves, and/or,
And the stator cavity is filled with heat-conducting sealant.
In some embodiments, the impeller comprises a mounting sleeve, a first wheel plate and a plurality of blades, the mounting sleeve is provided with a second wheel plate along the radial extension of the mounting sleeve, the first wheel plate is arranged at one side of the second wheel plate at intervals and is provided with a suction inlet, and the blades are arranged between the first wheel plate and the second wheel plate;
One end of the rotating shaft extending into the driving cavity extends into the suction inlet from the mounting sleeve, and a step surface is arranged on one side of the mounting sleeve, which is close to the machine shell, wherein the communication position of the driving cavity and the suction flow channel is positioned in the axial direction of the rotating shaft, and the communication position of the driving cavity and the cavity is positioned on one side of the first wheel plate in the radial direction;
the self-priming pump further comprises a diversion cap, and the diversion cap is sleeved at one end of the rotating shaft extending into the suction inlet.
In some embodiments, the end of the first wheel plate, which is far away from the mounting sleeve, is convexly provided with a sealing boss, the self-priming pump further comprises a first sealing stationary ring and a first sealing movable ring, the first sealing stationary ring is arranged on the inner wall of the driving cavity and is positioned at the communication position of the driving cavity and the suction flow channel, and the first sealing movable ring is sleeved outside the sealing boss and corresponds to the first sealing stationary ring.
In some embodiments, the self-priming pump further comprises a second sealing stationary ring and a second sealing movable ring, wherein the second sealing stationary ring is installed on one side of the casing close to the driving cavity, the spacer ring is arranged on the periphery of the installation sleeve, and the second sealing movable ring is sleeved on the installation sleeve and corresponds to the second sealing stationary ring.
In some embodiments, the suction flow passage and external communication port is located above the impeller and below the cavity and external communication port.
Compared with the prior art, in the self-priming pump provided by the invention, the outer wall surface of the pump shell is concaved towards the cavity to form the driving cavity, the impeller is arranged in the driving cavity, and meanwhile, the shell of the driving motor is directly covered at the opening of the driving cavity, so that the rotating shaft of the driving motor can be directly connected with the impeller, and the rotating shaft of the driving motor can drive external fluid to enter the suction flow channel from the communication port of the suction flow channel when rotating, then sequentially passes through the driving cavity and the cavity, and finally is discharged from the communication port of the cavity, thereby realizing fluid delivery. Therefore, the pump shell and the shell are integrated together, the coupling is not needed for transmission, the vibration abnormal sound caused by the misalignment of the shafting is avoided, the whole structure of the self-priming pump is more compact, the volume and the weight of the self-priming pump are reduced, the occupied space of the whole structure is reduced, the installation in narrow space areas such as a ship cabin is facilitated, and the practicability is improved.
Drawings
FIG. 1 is a schematic diagram of a self-priming pump provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the self-priming pump of FIG. 1;
FIG. 3 is a cross-sectional view of the drive motor and impeller of FIG. 2;
FIG. 4 is a schematic view of the pump housing of FIG. 1;
FIG. 5 is a cross-sectional view of the pump housing of FIG. 4 corresponding to a fluid outlet;
FIG. 6 is a partial schematic view of the drive motor of FIG. 3;
FIG. 7 is a cross-sectional view of the housing of FIG. 3;
FIG. 8 is an enlarged schematic view at A in FIG. 3;
FIG. 9 is a cross-sectional view of the drive motor of FIG. 3;
FIG. 10 is a cross-sectional view of the impeller of FIG. 3;
FIG. 11 is a schematic view of the spindle of FIG. 2;
FIG. 12 is a schematic view of the support ring of FIG. 9;
Fig. 13 is a cross-sectional view of the support ring of fig. 12.
Reference numerals illustrate:
1. The pump casing comprises a pump shell, a cavity, a1, a liquid outlet, a 1a2, a waste discharge outlet, a 1b, a suction runner, a 1b1, a liquid inlet, a 1c, a driving cavity, a 1c1, a waste liquid outlet, a 1d, a communication port, a 1d1, a pump body inlet, a 1d2, a pump body outlet, a2, an impeller, a 21, a mounting sleeve, a 211, a second wheel plate, a22, a first wheel plate, a22 a, a suction inlet, a 221, a sealing boss, a 23, a blade, a3, a driving motor, a 31, a shell, a 31a, a stator cavity, a 31b, an overflow gap, a 31c, a wiring hole, a 311, an annular baffle, a 312, a stator shell, a 313, an end cover, a 32, a rotating shaft, a 32a backflow channel, a 321, a step surface, a 33, a rotor, a 331, a support ring, a 331a mounting groove, a permanent magnet, a 333, a rotor core, a 334, a rotor sealing cover plate, a 34, a stator, a 341, a stator core, a 342, a winding, a 35, a bearing, a 36, a stator sealing cover plate, a 37, a transparent window, a4, a diversion cap, a 5, a first sealing ring, a second sealing ring and a second sealing ring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to solve the technical problems that a self-priming centrifugal pump is connected with a motor and an impeller through a coupling, has large volume and weight and is easy to cause abnormal vibration due to poor centering of a shaft system, the invention provides the self-priming pump, which can avoid abnormal vibration caused by non-centering of the shaft system, has a more compact integral structure, reduces the volume and weight of the self-priming pump, reduces the space occupied by the integral structure, is beneficial to installation in small space areas such as a ship cabin and the like, and improves the practicability.
Referring to fig. 1 and 2, fig. 1 and 2 are schematic structural diagrams of a self-priming pump according to an embodiment of the present invention, the self-priming pump includes a pump housing 1, an impeller 2 and a driving motor 3, wherein the pump housing 1 has a cavity 1a and a suction flow channel 1b located in the cavity 1a, the outer wall surface of the pump housing is concavely provided with a driving cavity 1c towards the cavity 1a, the driving cavity 1c and the suction flow channel 1b are sequentially communicated, the cavity 1a and the suction flow channel 1b are respectively provided with a communication port 1d communicated with the outside, the driving cavity 1c is far away from one side opening of the cavity 1a, the impeller 2 is axially rotatably arranged in the driving cavity 1c around the impeller 2 and can drive fluid to sequentially flow through the suction flow channel 1b, the driving cavity 1c and the cavity 1a during rotation, a casing 31 of the driving motor 3 is covered on the opening of the driving cavity 1c, and a rotating shaft 32 is extended into the driving cavity 1c from the casing 31 and is connected to the impeller 2 for driving the impeller 2 to rotate around the axial direction.
In the self-priming pump provided by the invention, the outer wall surface of the pump shell 1 is concaved inwards towards the cavity body 1a to form the driving cavity 1c, the impeller 2 is arranged in the driving cavity 1c, and meanwhile, the shell 31 of the driving motor 3 is directly covered at the opening of the driving cavity 1c, so that the rotating shaft 32 of the driving motor 3 can be directly connected with the impeller 2, and the rotating shaft 32 of the driving motor 3 can drive external fluid to enter the suction flow channel 1b from the communication port 1d of the suction flow channel 1b during rotation, and then is discharged from the communication port 1d of the cavity body 1a through the driving cavity 1c and the cavity body 1a in sequence, thereby realizing fluid delivery. Therefore, the pump shell 1 and the shell 31 are integrated together, and the coupling is not needed for transmission, so that vibration abnormal sound caused by shafting misalignment is avoided, the whole structure of the self-priming pump is more compact, the volume and the weight of the self-priming pump are reduced, the space occupied by the whole structure is reduced, the installation in narrow and small space areas such as a ship cabin is facilitated, and the practicability is improved. The casing 31 is connected to the pump casing 1 by bolts, and is provided with a seal ring.
In one embodiment, referring to fig. 3, the driving motor 3 further includes a rotor 33 and two sets of stators 34, the rotor 33 is located in the housing 31 and sleeved on the periphery of the rotating shaft 32, and the two sets of stators 34 are mounted on the inner wall of the housing 31 and located on two sides of the rotor 33 in the axial direction.
In this embodiment, the stator 34 and the rotor 33 are arranged along the axial direction of the rotating shaft 32, specifically, one stator 34 is respectively disposed at two axial sides of the rotor 33, so that the rotation stability of the rotor 33 is ensured and the compactness of the overall structure is improved. In the present embodiment, each stator 34 includes a stator core 341 and a winding 342.
In one embodiment, referring to fig. 6 to 8, stator cavities 31a are disposed at two axial ends of the casing 31, an annular partition 311 is disposed on an inner wall of each stator cavity 31a near one end of the rotating shaft 32 and extends toward the other stator cavity 31a, two sets of stators 34 are respectively disposed in the two sets of stator cavities 31a, a rotor 33 is disposed between the two annular partition 311 and a gap is reserved between each stator 34, the driving motor 3 further comprises two sets of bearings 35 and two sets of stator sealing cover plates 36, the two sets of bearings 35 are respectively disposed between the two annular partition 311 and the rotating shaft 32, and the two sets of stator sealing cover plates 36 are respectively disposed on one ends of the two annular partition 311 near the other annular partition 311.
In this embodiment, referring to fig. 3, the annular partition 311 and the stator sealing cover 36 seal the stator 34 in the stator cavity 31a, so as to avoid erosion of the stator 34 by fluid and prolong the service life of the stator 34. Meanwhile, a gap is reserved between the stator 34 and the rotor 33, so that fluid in the driving cavity 1c can flow to one side of the rotating shaft 32 away from the cavity 1a after passing through the gap between the inner ring and the outer ring of the bearing 35 and the gap between the stator 34 and the rotor 33, namely, enters the right space of the rotating shaft 32, and cooling of the motor and lubrication of the bearing 35 are realized. The gap reserved between the rotor 33 and the stator 34 is an air gap between the stator and the rotor 33 of the axial flux motor, and the larger the power is, the larger the air gap is, usually 0.5 to 5 mm. In addition, a temperature sensor is provided in the stator cavity 31a to monitor the temperature of the windings 342.
In one embodiment, referring to fig. 6 and 7, the rotating shaft 32 and the side wall of the housing 31 far from the cavity 1a are spaced apart to form an overflow gap 31b, and a return channel 32a is axially arranged along the overflow gap 31b, and the return channel 32a communicates with the overflow gap 31b and the driving cavity 1c.
In this embodiment, the fluid can sequentially flow through the driving chamber 1c, the left bearing 35, the gap between the left stator 34 and the rotor 33, the right bearing 35, the gap between the right stator 34 and the rotor 33, and finally enter the right overcurrent gap 31b of the rotating shaft 32, and then flow back into the driving chamber 1c from the backflow channel 32a of the rotating shaft 32. Thus, the circulation of the fluid on the left and right sides of the rotating shaft 32 is realized, and the cooling and lubrication actions on the motor and the bearing 35 are further improved.
In one embodiment, referring to fig. 9, a transparent window 37 is disposed on a side of the flow gap 31b away from the cavity 1a, and the transparent window 37 is opposite to the rotating shaft 32.
In this embodiment, whether the turning and return passage 32a of the rotary shaft 32 is clogged or not can be observed through the transparent window 37. In addition, in an embodiment, a pressure sensor and a temperature sensor can be further disposed in the flow gap 31b, so as to monitor the pressure and the temperature of the chamber fluid on the right side of the rotating shaft 32.
In one embodiment, referring to fig. 12 and 13, the rotor 33 includes a support ring 331, two sets of permanent magnets 332, two sets of rotor cores 333 and two rotor sealing cover plates 334, the support ring 331 is sleeved on the periphery of the rotating shaft 32 and is located between the two annular partition plates 311, mounting grooves 331a are respectively concavely formed on two axial sides of the support ring 331, the two sets of permanent magnets 332 and the two sets of rotor cores 333 are respectively disposed in the two mounting grooves 331a, and the two rotor 33 sealing plates cover openings of the two mounting grooves 331 a.
In the present embodiment, the rotor 33 is set in the form of a supporting ring 331, and mounting slots 331a are provided on two sides of the supporting ring 331 for mounting the permanent magnets 332 and the rotor 33 core, so that the rotor 33 can stably drive the rotating shaft 32 to rotate, and the rotor 33 is relatively compact in structure. In addition, the permanent magnet 332 and the rotor 33 core can be sealed in the mounting groove 331a by the rotor 33 sealing plate, and the service life can be prolonged.
In addition, in an embodiment, the stator cavities 31a are filled with a heat-conducting sealant, specifically, each stator cavity 31a is respectively provided with a routing hole 31c communicated with the outside, and after the stator 34 is assembled, the heat-conducting sealant can be filled into the corresponding stator cavity 31a through the routing holes 31c, so that the heat dissipation performance and the sealing performance of the winding 342 are ensured.
In one embodiment, referring to fig. 10 and 11, the impeller 2 includes a mounting sleeve 21, a first wheel plate 22 and a plurality of blades 23, the mounting sleeve 21 is provided with a second wheel plate 211 along its radial extension, the first wheel plate 22 is arranged at a distance on one side of the second wheel plate 211 and is provided with a suction inlet 22a, the plurality of blades 23 are arranged between the first wheel plate 22 and the second wheel plate 211, one end of a rotating shaft 32 extending into a driving cavity 1c extends into the suction inlet 22a from the mounting sleeve 21, and one side of the mounting sleeve 21 near the casing 31 is provided with a step surface 321, wherein the connection part of the driving cavity 1c and the suction channel 1b is located in the axial direction of the rotating shaft 32, the connection part of the driving cavity 1c and the cavity 1a is located on one side of the first wheel plate 22 in the radial direction, the self-priming pump further includes a diversion cap 4, and the diversion cap 4 is sleeved at one end of the rotating shaft 32 extending into the suction inlet 22 a.
In this embodiment, the impeller 2 is locked on the rotating shaft 32 by the deflector cap 4, and when the impeller 2 rotates, the fluid enters the suction inlet 22a from the suction flow channel 1b, and is driven to be conveyed into the cavity 1a by the vane 23 between the two impeller plates. It should be noted that, referring to fig. 4, in this embodiment, a communication position between the suction flow channel 1b and the driving cavity 1c is defined as a liquid inlet 1b1, and a communication position between the driving cavity 1c and the cavity 1a is defined as a liquid outlet 1a1. Further, a communication port 1d through which the suction flow passage 1b communicates with the outside is defined as a pump body inlet 1d1, and a communication port 1d through which the cavity 1a communicates with the outside is defined as a pump body outlet 1d2.
In addition, in one embodiment, the deflector cap 4 is screwed with the rotating shaft 32, and further locked by the pin hole and the pin. Furthermore, in the above embodiment based on the backflow channel 32a, the diversion cap 4 is further provided with a hole for backflow.
In one embodiment, a sealing boss 221 is protruding from one end of the first wheel plate 22 away from the mounting sleeve 21, the self-priming pump further includes a first sealing stationary ring 5 and a first sealing moving ring 51, the first sealing stationary ring 5 is disposed on the inner wall of the driving cavity 1c and is located at the communication position between the driving cavity 1c and the suction flow channel 1b, and the first sealing moving ring 51 is sleeved outside the sealing boss 221 and corresponds to the first sealing stationary ring 5.
In this embodiment, a dynamic sealing ring and a static sealing ring are disposed at the interface between the sealing boss 221 and the suction flow channel 1b to prevent fluid from entering the driving cavity 1c without passing through the suction inlet 22a, that is, to ensure that fluid can enter between the two wheel plates from the suction flow channel 1b via the suction inlet 22a, so that the fluid can be effectively driven by the vane 23 to enter the cavity 1a from the liquid outlet 1a1 and finally be discharged from the pump body outlet 1d2, thereby improving the output lift. The radial clearance between the first seal stationary ring 5 and the first seal movable ring 51 is controlled to be 0.1mm to 0.2 mm.
In one embodiment, the self priming pump further includes a second seal stationary ring 6 and a second seal movable ring 61, the second seal stationary ring 6 is mounted on a side of the casing 31 close to the driving cavity 1c, the spacer ring is disposed on the outer periphery of the mounting sleeve 21, and the second seal movable ring 61 is sleeved on the mounting sleeve 21 and corresponds to the second seal stationary ring 6.
In this embodiment, a dynamic seal ring and a static seal ring are further disposed between the mounting sleeve 21 and the housing 31 to control the gap between the fluid rotation shaft 32 and the housing 31 to enter the housing 31. Specifically, in the present embodiment, based on the embodiment of the return passage 32a, a gap exists between the second seal stationary ring 6 and the second seal movable ring 61 in the radial direction, and the radial gap is controlled to be 0.2 mm to 0.4 mm, so that the fluid can pass through the radial gap between the second seal stationary ring 6 and the second seal movable ring 61.
In one embodiment, the communication port 1d between the suction flow passage 1b and the outside is located above the impeller 2 and below the communication port 1d between the chamber 1a and the outside.
In this embodiment, the pump inlet 1d1 is disposed above the impeller 2, and the pump outlet 1d2 is disposed above the pump inlet 1d1, so that the impeller 2 is immersed in the pumped liquid after each stop of the pump, and the pump can be effectively self-priming when started next time. The liquid outlet 1a1 is disposed at the upper end of the driving chamber 1c and corresponds to the pump outlet 1d2. In addition, the bottom of the driving cavity 1c is also provided with a waste liquid port 1c1, the waste liquid port 1c1 is communicated with the bottom of the cavity 1a, the bottom of the cavity 1a is also communicated with an external waste discharge port 1a2, and the waste discharge port 1a2 is provided with a waste discharge valve so as to be convenient for periodical cleaning.
In addition, it should be noted that, in an embodiment, the casing 31 is composed of two stator shells 312 and one end cover 313, the two stator shells 312 are enclosed together to form a cavity, the end cover 313 is covered on an end of the stator shell 312 far from the cavity 1a, and is provided with a transparent window 37, and each connection part is connected by a bolt, and a sealing ring is correspondingly arranged.
For a better understanding of the present invention, the following details of the technical solution of the present invention are described with reference to fig. 1 to 13:
In this embodiment, the pump unit is manufactured and assembled by assembling the above parts, assembling the stator 34 and rotor 33 components of the driving motor 3 in place, then assembling and locking the driving system and impeller 2 in place, and finally integrally installing them in the driving chamber 1c of the pump housing 1.
For the motor, the stator core 341 and the winding 342 of the driving motor 3, and the winding 342 coils, the position and the temperature sensor on the stator core and the winding 342 are firstly installed in the stator cavity 31a of the driving motor 3, and the stator sealing cover plate 36 is installed on the end face of the corresponding annular partition plate 311 in a welding mode or the like, so that the stator sealing cover plate 36 is ensured to be closely attached to the surfaces of the stator core 341 and the winding 342. With this encapsulation process, windings 342 are isolated from the external pumped liquid while motor stator 34 is cooled with the pumped liquid. After the installation is completed, the high heat conduction sealant is encapsulated through the wiring hole 31c, and the space except the stator core 341 and the winding 342 in the stator cavity 31a is filled.
For the rotor 33 assembly of the driving motor 3, the rotor core 333 of the driving motor 3 is firstly respectively installed on two sides of the supporting ring 331 to keep the centers of the three coaxial, then the permanent magnet 332 is installed on the outer side surface of the rotor core 333, and the rotor sealing cover plate 334 is respectively welded or otherwise installed on the port of the installation groove 331a of the supporting ring 331 to complete the encapsulation of the rotor core 333 and the magnet. After the encapsulation is completed, glue filling and glue filling hole plugging are carried out in the cavity 1a of the rotor 33 through the relevant reserved holes on the supporting ring 331, and the manufacturing of the rotor 33 assembly of the driving motor 3 is completed.
During assembly, the assembly of the drive system and the impeller 2 is completed. The method comprises the specific steps of (1) installing a rotor 33 assembly of a driving motor 3 on a rotating shaft 32 and pressing the rotor 33 assembly by using a gland, (2) installing a bearing 35 in an inner hole seat of an annular partition plate 311, inserting the rotating shaft 32 into an inner hole of the bearing 35 from the left side and installing the bearing in place, (3) installing another bearing 35 on the right side of the rotating shaft 32, and installing another gland to a corresponding seat hole for locking. The installation of the stator and rotor 33 assembly of the driving motor 3 is completed. (4) The second seal stationary ring 6 and the second seal movable ring 61 are installed at the corresponding inner holes of the casing 31, the first seal movable ring 51 is installed at the seal boss 221 of the impeller 2, and the impeller 2 is installed on the transmission shaft and locked by the diversion cap 4. The assembly of the drive system and the impeller 2 is completed. (6) The first seal stationary ring 5 is installed on the suction flow channel 1b near the liquid inlet 1b1, the assembled driving system and the impeller 2 are integrally installed in the driving cavity 1c of the pump body, the transparent window 37 is installed on the end cover 313 and is pressed by a pressing cover, and the end cover 313 is installed on the stator shell 312 of the driving motor 3. The installation of the entire pump is completed.
During operation, the pumped liquid is filled into the pump body, the whole impeller 2 is immersed, the pump set is started, liquid suction and discharge can be realized, and the rotation speed, flow and lift of the pump set can be regulated by regulating the frequency of input voltage. Under the action of pressure, liquid on the left side of the impeller 2 sequentially flows through the radial gap between the second sealing movable ring 61 and the second sealing stationary ring 6, the bearing 35, the air gap between the stator sealing cover plate 36 and the rotor sealing cover plate 334, enters the space on the right side of the rotating shaft 32, and enters the suction inlet 22a of the impeller 2 through the backflow channel 32a on the axis of the rotating shaft 32 and the holes on the diversion cap 4, so that the cooling of the motor and the lubrication of the bearing 35 are realized. The turning of the turning shaft and whether the return passage 32a is dirty or not can be observed through the transparent window 37. The end cover 313 can be further provided with a pressure sensor and a temperature sensor to monitor the pressure and the temperature of the flowing liquid in the right cavity of the transmission.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.