CN212536059U - Internal gear pump with overflow function - Google Patents

Abstract

The utility model discloses an crescent gear pump with overflow function belongs to gear pump technical field. The novel oil-water separator is characterized by mainly comprising an inner gear ring and a gear which are matched with each other, wherein the crescent plate comprises a plate body, a containing cavity and a return channel arranged in the plate body, an overflow assembly is further arranged in the containing cavity of the plate body and comprises a shell, a valve core, an overflow valve spring and an adjusting screw, and an oil inlet channel, a communicating cavity, a valve port channel, an overflow channel, a sliding channel and a spring containing hole are sequentially arranged in the shell. The utility model discloses crescent gear pump with overflow function, inside its overflow subassembly that has the overflow function integrated the crescent moon board to the pump body in, not only improved its compact structure of functional while of gear pump, the installation environment is limited for a short time.

Description

Internal gear pump with overflow function

Technical Field

The utility model relates to a gear pump technical field, concretely relates to crescent gear pump with overflow function.

Background

The inner engaged gear pump adopts the principle of gear inner engagement, the pitch circle of the inner gear and the pitch circle of the outer gear are close to one side, and the other side is separated by a crescent moon plate on the pump cover. The driving inner gear on the main shaft drives the outer gears to rotate in the same direction, the gears are separated from each other at the inlet to form an oil suction cavity with negative pressure to suck liquid, and the gears are continuously embedded and meshed at the outlet to form an oil pressing cavity to extrude and output the liquid. Install the overflow valve and play the steady voltage effect on the one hand in the gear pump, thereby on the other hand prevents that the execute component from transshipping and plays overload protection to the gear pump, and current gear pump does not have the overflow function, and the function singleness needs additionally to install the overflow valve, and additional overflow valve makes the gear pump appearance increase and complicate to the installation environment that makes the gear pump receives certain restriction.

There is a need to provide a crescent gear pump with an overflow function to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem who solves: provided is an internal gear pump having an overflow function, which can reduce the installation environment limitation rate of the gear pump without increasing the size of the gear pump while having the overflow function.

In order to solve the technical problem, the utility model discloses a as follows technical scheme be: an internal gear pump with an overflow function comprises a pump body, a crescent plate, an inner gear ring, a gear, a driving shaft, an oil suction port and an oil discharge port, wherein the inner gear ring and the gear are correspondingly matched and rotatably arranged in the pump body; the crescent plate comprises a plate body, wherein a containing cavity and a backflow channel are formed in the plate body and face the side face of the end cover, one end of the backflow channel is communicated with the containing cavity, the other end of the backflow channel is connected with an oil suction cavity, an overflow assembly is further arranged in the containing cavity and comprises a shell, a valve core, an overflow valve spring and an adjusting screw, an oil inlet channel, a communicating cavity, a valve port channel, an overflow channel, a sliding channel and a spring containing hole are sequentially formed in the shell, the valve core is arranged in the sliding channel in a sliding mode, a valve head of the valve core penetrates through the overflow channel and extends into the valve port channel when the valve core is in a closed state, the overflow valve spring is arranged in the spring containing hole, and the adjusting screw is arranged at an opening of the spring; the oil pump is characterized in that a one-way valve connected with the oil pressing cavity is further arranged on the outer wall of the pump body, a connecting pipe is arranged at the other end of the one-way valve, the oil discharge port is arranged at the other end of the connecting pipe, an overflow port is formed in the side wall of the connecting pipe, an overflow pipeline is further arranged at the overflow port, and the other end of the overflow pipeline is communicated with an oil inlet channel in the overflow assembly.

Furthermore, the guide hole of the overflow assembly arranged in the accommodating cavity corresponds to and is communicated with the return channel on the crescent plate.

Furthermore, be equipped with the first recess corresponding with the crescent moon board on the medial surface of end cover, still be equipped with the second recess corresponding with overflow assembly on the crescent moon board on the first recess first through-hole has been seted up on the end cover and with the position that adjusting screw corresponds on the overflow assembly the second through-hole has been seted up on the end cover and with the position that the last oil feed passageway of overflow assembly corresponds.

Furthermore, one end of the overflow pipeline, which is close to the oil inlet channel, is connected to the opening of the second through hole.

Furthermore, a valve port is arranged in the check valve, an opening and closing ball body is arranged on one side of the valve port, and a check valve spring is arranged at the other end of the opening and closing ball body.

Furthermore, the overflow valve spring and the check valve spring are compression springs.

Further, one end of the driving shaft extends to the outer side of the pump body.

Further, the oil suction port is communicated with the oil suction cavity.

The beneficial technical effects are that: the utility model discloses an internal gear pump with overflow function, the crescent moon board side in the pump body is equipped with and holds the chamber, the plate internal of crescent moon board is equipped with the return channel who feeds through with oil absorption chamber, hold the intracavity portion and be equipped with the overflow subassembly, still be equipped with the overflow pipeline outside the pump body, the one end of overflow pipeline is linked together with the oil feed passageway in the overflow subassembly, the other end links to each other with the oil drain, pressure oil in the oil drain flows to the overflow subassembly through the overflow pipeline, like this when the oil pressure in the pressure oil chamber is too high, too high pressure will trigger the overflow subassembly, push open the case in the overflow subassembly, make some hydraulic oil flow to the return channel on the crescent moon board through the overflow subassembly, discharge back in the oil absorption chamber at last, until the pressure returns to normal in the pressure oil chamber, the utility model discloses gear pump with overflow function, its overflow subassembly that has the overflow function integrates to the crescent moon inboard in the, the gear pump has the advantages of improved functionality, compact structure and small limitation on installation environment.

Drawings

The present invention will be further explained with reference to the drawings and examples.

In the figure: fig. 1 is a schematic structural view of a ring gear pump with an overflow function according to the present invention (and an end cover is omitted for convenience of observation);

FIG. 2 is a partial cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural view of the crescent in FIG. 1;

FIG. 4 is a longitudinal cross-sectional view taken along the center line of symmetry in FIG. 3;

FIG. 5 is a schematic diagram of the overflow assembly of FIG. 1;

FIG. 6 is a horizontal cross-sectional view taken along the center line of symmetry in FIG. 5;

in the figure:

1. a pump body; 11. an inner gear ring; 111. an oil suction cavity; 112. pressing an oil cavity; 12. a gear; 13. a drive shaft; 14. an end cap; 141. a first groove; 142. a second groove; 143. a first through hole; 144. a second through hole; 15. an oil suction port; 16. a one-way valve; 161. a valve port; 162. opening and closing the ball body; 163. a check valve spring; 17. a connecting pipe; 171. an overflow port; 18. an oil discharge port; 19. an overflow conduit;

2. a crescent plate; 21. a plate body; 22. an accommodating chamber; 23. a return channel; 3. an overflow assembly; 31. a housing; 311. an oil inlet channel; 312. the cavity is communicated; 313. a valve port channel; 314. an overflow channel; 315. a guide hole; 316. a slipping channel; 317. a spring receiving cavity; 32. a valve core; 33. an overflow valve spring; 34. and adjusting the screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the internal gear pump with overflow function comprises a pump body 1, an oil suction port 15 and an oil discharge port 18 are arranged on the outer side wall of the pump body 1, an inner gear ring 11 and a gear 12 which are meshed with each other and arranged inside the pump body 1, a driving shaft 13 which is inserted through the center of the gear 12, when the driving shaft 13 drives the inner gear ring 11 and the gear 12 to rotate, an oil suction chamber 111 is formed in a region where the ring gear 11 is disengaged from the gear 12, hydraulic oil is sucked in, the oil suction cavity 111 and the oil pressing cavity 112 are separated into two independent areas by the crescent plate 2 fixedly arranged in a gap between the internal gear 11 and the gear 12, and the overflow assembly 3 is further arranged on the crescent plate 2 and performs overflow protection when the oil pressure at the position of the oil discharge port 18 is overhigh.

As shown in fig. 2, in the present embodiment, the oil suction port 15 is communicated with the oil suction cavity 111 in the pump body 1, a check valve 16 fixedly disposed on the pump body 1 and communicated with the oil pressing cavity 112 is further disposed between the oil discharge port 18 and the pump body 1, a valve port 161 is fixedly disposed inside the check valve 16 and near one side of the pump body 1, an opening and closing ball 162 attached to the valve port 161 is disposed at the other side of the valve port 161, a check valve spring 163 is fixedly disposed on the opening and closing ball 162 at the side opposite to the valve port 161, a connection pipe 17 is fixedly disposed between the check valve 16 and the oil discharge port 18, an overflow port 171 is disposed on the side wall of the, an overflow pipe 19 is fixed at the position of the overflow port 171, so that when the oil pressure at the position of the oil discharge port 18 is too high, the check valve 16 can firstly block the high-pressure hydraulic oil at the oil outlet 18, and the overflow protection is carried out through the overflow pipeline 19, so that the double protection effect is achieved on the gear pump.

As shown in fig. 3 and 4, the crescent 2 includes a plate body 21, a containing cavity 22 is formed in one side of the plate body 21, a return passage 23 is further formed inside the plate body 21, one end of the return passage 23 is connected to the containing cavity 22, and the other end of the return passage 23 extends to the oil suction cavity 111.

As shown in fig. 5 and 6, in the present embodiment, the relief assembly 3 includes a housing 31, a valve spool 32 provided in the housing 31, a relief valve spring 33, and an adjustment screw 34; the shape of the housing 31 corresponds to the shape of the accommodating cavity 22, so that the housing 31 is conveniently installed in the accommodating cavity 22, as shown in fig. 6, an oil inlet passage 311, a communication cavity 312, a valve port passage 313, an overflow passage 314, a sliding passage 316 and a spring accommodating hole 317 are further formed in the housing 31; an oil inlet passage 311 is provided along the length direction of the housing 31, and one end of the oil inlet passage 311 extends to the outside, a communication cavity 312 is located at the bottom position of the housing 31 and is vertically communicated with the oil inlet passage 311, a valve port passage 313 is parallel to the oil inlet passage 311, and one end of the oil inlet passage 311 is connected with the communication cavity 312, the other end of the oil inlet passage 311 is connected with an overflow passage 314, the other end of the overflow passage 314 is connected with a slide passage 316, a valve core 32 is slidably provided in the slide passage 313, and the valve core 32 extends into the valve port passage 313 through the overflow passage 314 in a closed state, one end of a spring accommodating hole 317 is connected with the slide passage 316, and the other end of the spring accommodating hole 317 extends to the outside of the housing 31, an adjusting screw 33 is screwed into an opening position outward of the spring accommodating hole 317, a relief valve spring 33 is interstitially provided in the spring accommodating hole, the valve port passage 313, the overflow passage 314, the slide passage 316, and the spring receiving hole 317 are coaxially disposed, a guide hole 315 communicating with the overflow passage 314 is further provided on the outer sidewall of the housing 31, and the guide hole 315 of the overflow assembly 3 placed in the receiving chamber 22 can communicate with the return passage 23.

As shown in fig. 2, the pump body 1 is further provided with an end cover 14 fastened to one end of the pump body 1 by bolts, and in order to stabilize the crescent plate 2, the inner side wall of the end cover 14 is provided with a first groove 141 correspondingly matched with the end surface of the plate body 21 of the crescent plate 2, and a second groove 142 corresponding to the housing 31 in the overflow assembly 3; in order to adjust the adjusting screw 34 in the overflow assembly 3 conveniently, a first through hole 143 for connecting the inside and the outside is further formed in the end cover 14 at a position corresponding to the adjusting screw 34 on the overflow assembly 3, a second through hole 144 for connecting the inside and the outside is formed in the end cover 14 at a position corresponding to the oil inlet channel 311 on the overflow assembly 3, and one end of the overflow pipeline 19 is fixedly connected to an opening at the outer side of the second through hole 144.

The working process of the inner gearing gear pump with overflow function of the utility model is described below with the accompanying drawings:

the overflow component 3 is inserted into the containing cavity 22 on the crescent plate 2 in a clearance fit manner, the end cover 14 buckled on the end face of the pump body 1 limits the crescent plate 2, and meanwhile, the overflow component 3 is pressed and fixed in the containing cavity 22, so that the overflow component 3 is hidden in the crescent plate 2; during normal operation, the driving shaft 13 is driven by the motor to rotate in the counterclockwise direction in fig. 1, the gear 12 is driven to rotate, the gear 12 is meshed to drive the inner gear ring 11 to rotate simultaneously, the gear 12 and the inner gear ring 11 are continuously disengaged in the oil suction cavity 111, the volume in the oil suction cavity 111 is increased, the pressure is reduced to form negative pressure, hydraulic oil enters the oil suction cavity 111 from the oil suction port 15, along with the rotation of the gear 12 and the inner gear ring 11 and the attachment of the gear 12 and the crescent plate 2, the hydraulic oil is locked in a closed space formed by an inter-tooth gap and the crescent plate 2, and finally moves to the right pressure oil cavity 112, the volume in the pressure oil cavity 112 is reduced by the hydraulic oil, the pressure is increased, the hydraulic oil pushes open and close ball 162 in the one-way valve 16 to move to the oil discharge port 18, when moving to the oil discharge port 18, part of the hydraulic oil flows to the overflow pipeline 19 through the, enters the oil inlet channel 311 of the overflow assembly 3 through the second through hole 144, finally flows into the communication cavity 312 and fills the valve port channel 313; if the oil pressure in the oil pressure chamber 112 is not higher than the rated value, the oil pressure cannot resist the elastic force of the relief valve spring 33 to push the valve core 32 open, if the oil pressure is higher than the rated value, that is, the set value of the relief valve spring 33, the valve core 32 will be forced to press the relief valve spring 33 and the valve core 32 will be retracted into the sliding channel 316, the valve port channel 313 is opened, a part of the hydraulic oil will flow from the relief channel 314 to the return channel 23 on the crescent plate 2 through the guide hole 315 and finally be returned into the oil suction chamber 111, so that the oil pressure in the oil pressure chamber 112 is reduced until the rated pressure value is reached, and the valve core 32 is closed again, thereby achieving the.

The utility model relates to an internal gear pump with overflow function, the side of crescent moon plate 2 in pump body 1 is provided with a holding cavity 22, a return channel 23 communicated with an oil suction cavity 111 is also arranged in a plate body 21 of crescent moon plate 2, an overflow component 3 is inserted in the holding cavity 22, the utility model is also provided with an overflow pipeline 19, one end of the overflow pipeline 19 is communicated with the outer end of an oil inlet channel 311 in the overflow component 3, the other end is connected with an oil discharge port 118, pressure oil in the oil discharge port 118 flows into the overflow component 3 through the overflow pipeline 19, thus when the oil pressure in the oil pressure cavity is overhigh, the overhigh pressure can trigger the overflow component 3 to push open a valve core 32 in the overflow component 3, so that partial hydraulic oil flows to the return channel 23 on the crescent moon plate 2 through the overflow component 3, and finally is discharged back to the oil suction cavity 111 until the pressure in the oil cavity 112 is recovered to be normal, the utility model discloses an internal gear pump with overflow, wherein the overflow assembly 3 with the overflow function is integrated into the crescent plate 2 in the pump body 1, thereby not only improving the functionality of the gear pump, but also ensuring the compact structure and the limited installation environment.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. An internal gear pump with an overflow function comprises a pump body (1), a crescent plate (2), an inner gear ring (11), a gear (12), a driving shaft (13), an oil suction port (15) and an oil discharge port (18), wherein the inner gear ring (11) and the gear (12) are correspondingly matched and rotatably arranged in the pump body (1), the crescent plate (2) is arranged in a gap between the inner gear ring (11) and the gear (12), the driving shaft (13) is arranged at the center of the gear (12), an oil suction cavity (111) is formed in the inner gear ring (11) and in an area where the inner gear ring (11) is disengaged from the gear (12), an oil pressing cavity (112) is formed in an area where the inner gear ring (11) and the gear (12) tend to be engaged, the oil suction port (15) and the oil discharge port (18) are arranged on the outer side face of the pump body (1), and an end cover (14) is further arranged at one end of, the method is characterized in that: the crescent plate (2) comprises a plate body (21), a containing cavity (22) and a return channel (23) arranged in the plate body (21) are formed in the side face, facing the end cover (14), of the plate body (21), one end of the return channel (23) is communicated with the containing cavity (22), the other end of the return channel (23) is connected with the oil suction cavity (111), an overflow assembly (3) is further arranged in the containing cavity (22), the overflow assembly (3) comprises a shell (31), a valve core (32), an overflow valve spring (33) and an adjusting screw (34), an oil inlet channel (311), a communicating cavity (312), a valve port channel (313), an overflow channel (314), a sliding channel (316) and a spring containing hole (317) are sequentially arranged in the shell (31), the valve core (32) is arranged in the sliding channel (316), and a valve head of the valve core (32) penetrates through the overflow channel (314) and extends to the valve port channel (317) when the valve core (32) is in a closed state 313) The overflow valve spring (33) is arranged in a spring accommodating hole (317), and the adjusting screw (34) is arranged at an opening of the spring accommodating hole (317) facing outwards; the oil pump is characterized in that a one-way valve (16) connected with an oil pressing cavity (112) is further arranged on the outer wall of the pump body (1), a connecting pipe (17) is arranged at the other end of the one-way valve (16), an oil discharge port (18) is arranged at the other end of the connecting pipe (17), an overflow port (171) is formed in the side wall of the connecting pipe (17), an overflow pipeline (19) is further arranged at the overflow port (171), and the other end of the overflow pipeline (19) is communicated with an oil inlet channel (311) in the overflow assembly (3).

2. A crescent gear pump with relief function as set forth in claim 1, wherein: the guide hole (315) of the overflow assembly (3) arranged in the containing cavity (22) corresponds to and is communicated with the return channel (23) on the crescent plate (2).

3. A crescent gear pump with relief function as set forth in claim 1, wherein: the inner side face of the end cover (14) is provided with a first groove (141) corresponding to the crescent plate (2), the first groove (141) is further provided with a second groove (142) corresponding to the overflow component (3) on the crescent plate (2), a first through hole (143) is formed in the end cover (14) and in a position corresponding to the adjusting screw (34) on the overflow component (3), and a second through hole (144) is formed in the end cover (14) and in a position corresponding to the oil inlet channel (311) on the overflow component (3).

4. A crescent gear pump with overflow function according to any of claims 1-3, characterized in that: one end of the overflow pipeline (19) close to the oil inlet channel (311) is connected to the opening of the second through hole (144).

5. A crescent gear pump with relief function as set forth in claim 1, wherein: a valve port (161) is arranged in the check valve (16), an opening and closing ball body (162) is arranged on one side of the valve port (161), and a check valve spring (163) is arranged at the other end of the opening and closing ball body (162).

6. An internal gear pump with overflow function according to claim 1 or 5, characterized in that: the overflow valve spring (33) and the check valve spring (163) are compression springs.

7. A crescent gear pump with relief function as set forth in claim 1, wherein: one end of the driving shaft (13) extends to the outer side of the pump body (1).

8. A crescent gear pump with relief function as set forth in claim 1, wherein: the oil suction opening (15) is communicated with the oil suction cavity (111).

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