CN211174573U

CN211174573U - Backflow structure of plunger pump

Info

Publication number: CN211174573U
Application number: CN201922484467.9U
Authority: CN
Inventors: 邱琦勇
Original assignee: Taizhou Yizhou Agricultural Machinery Co ltd
Current assignee: Taizhou Yizhou Agricultural Machinery Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-04
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a backflow structure of plunger pump belongs to mechanical technical field. The plunger pump solves the problem that the existing plunger pump is easy to break a pipeline due to overlarge pressure when closed. This backflow structure of plunger pump, the plunger pump includes the pump head, the pump head includes water inlet nozzle and pump chamber, water inlet nozzle and pump chamber are linked together, backflow structure is including setting up the three-way valve on the pump head, the three-way valve includes the water inlet that communicates each other, the delivery port, backward flow export and valve pocket, delivery port and backward flow export all are linked together with the valve pocket, the valve pocket is linked together with the pump chamber through the water inlet, be provided with the case subassembly in the valve pocket, and the top of valve pocket has the backward flow chamber, the backward flow chamber is linked together through backward flow passageway and delivery port, the pump head still includes the backward flow entry that is. After pumping pressure is finished, liquid medicine can flow back to the pump cavity from the valve cavity of the three-way valve, pressure is quickly released, and pipelines are prevented from being damaged.

Description

Backflow structure of plunger pump

Technical Field

The utility model belongs to the technical field of belong to machinery, a backflow structure of plunger pump, especially a plunger pump is related to.

Background

The plunger pump is an important device in a hydraulic system, and water is sucked and pressed by means of reciprocating motion of a plunger in a cylinder body and changing the sealed volume. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing to be regulated. Chinese patent [ grant publication No.: CN2406079Y discloses a reciprocating plunger pump, which comprises a pump body, a pump head, a crankshaft, a connecting rod, a plunger, a water inlet and a water outlet, wherein the pump body is connected with the pump head, a pump cavity is arranged in the pump head, the pump head is provided with the water inlet and the water outlet, the water inlet and the water outlet are communicated with the pump cavity, the plunger is partially positioned in the pump cavity, one end of the connecting rod is hinged with the crankshaft, the other end of the connecting rod is hinged with the plunger, the crankshaft rotates to drive the plunger to reciprocate in the pump cavity, so that water is sucked into the pump cavity, and then high pressure. In actual use, the reciprocating plunger pump is usually installed in a pipeline, and if the pressure in the pipeline is too high when the plunger pump is closed, the pipeline can burst, so that a safety hazard exists.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a backflow structure of plunger pump, the technical problem that it will solve is how to realize the liquid pumpback in the plunger pump pipeline.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a backflow structure of plunger pump, the plunger pump includes the pump head, the pump head includes intake nozzle and pump chamber, intake nozzle and pump chamber are linked together, a serial communication port, backflow structure is including setting up the three-way valve on the pump head, the three-way valve is including water inlet, delivery port, backward flow export and the valve pocket that communicates each other, delivery port and backward flow export all are linked together with the valve pocket, the valve pocket is linked together through water inlet and pump chamber, be provided with the case subassembly in the valve pocket, and the top of valve pocket has the backward flow chamber, the backward flow chamber is linked together through backflow passage and delivery port, the pump head still includes the backward flow entry that is linked together with the pump chamber, backward flow export and backward.

In the backflow structure of the plunger pump, the valve core assembly comprises a valve rod, a valve ring, a gasket, a valve ball, a first spring and a water inlet seat, the water inlet seat is fixedly arranged in the water inlet, the water inlet seat is provided with a water inlet hole communicated with the valve cavity, the first spring is arranged between the valve ball and the water inlet seat, the gasket is arranged at the top of the valve ball, the valve ring is fixedly sleeved on the valve rod, and the bottom end of the valve rod penetrates through the gasket and abuts against the valve ball.

In the backflow structure of the plunger pump, the valve cover is arranged at the top of the valve cavity, and an elastic part used for pressing the valve rod downwards on the valve ball is arranged between the valve rod and the valve cover.

In the backflow structure of the plunger pump, the valve core assembly further comprises an adjusting knob, the valve rod is inserted into the valve cover, the adjusting knob is screwed at the upper end of the valve rod through threads, a second spring is arranged on the adjusting knob, and the second spring is sleeved on the valve rod and located between the adjusting knob and the valve cover.

In the backflow structure of the plunger pump, the water outlet and the backflow outlet are respectively located on two sides of the valve cavity, and the water outlet is located below the backflow outlet.

In the above-mentioned backflow structure of the plunger pump, a check valve is provided on the water outlet.

In the above-mentioned backflow structure of plunger pump, the three-way valve sets up on the top of pump head, water inlet nozzle and backward flow entry all set up the lower part at the pump head, and the backward flow entry is located the below of water inlet nozzle.

In the above-mentioned return structure of the plunger pump, the pump head is provided with a pressure gauge, and the pressure gauge is communicated with the pump cavity.

Compared with the prior art, the utility model discloses after the pumping pressure finishes, can carry out the liquid medicine by the valve pocket backward flow of three-way valve to the pump chamber in, quick release pressure avoids the pipeline impaired.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the three-way valve in the water pumping stop state of the present invention.

Fig. 3 is a cross-sectional view of the three-way valve in the water pumping operation state of the present invention.

In the figure, 1, a pump head; 2. a water inlet nozzle; 3. a three-way valve; 4. a water inlet; 5. a water outlet; 6. a return outlet; 7. a valve cavity; 8. a reflux cavity; 9. a return channel; 10. a reflux inlet; 11. a connecting pipe; 12. a valve stem; 13. a valve ring; 14. a gasket; 15. a valve ball; 16. a first spring; 17. a water inlet seat; 18. a water inlet hole; 19. a valve cover; 20. adjusting a knob; 21. a second spring; 22. a check valve; 23. and a pressure gauge.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Referring to fig. 1-3, this embodiment is a backflow structure of plunger pump, the plunger pump includes pump head 1, pump head 1 includes water inlet nozzle 2, pump chamber and backflow inlet 10, water inlet nozzle 2 and pump chamber are linked together, backflow structure is including setting up three-way valve 3 on pump head 1, three-way valve 3 is including the water inlet 4 of mutual intercommunication, delivery port 5, backflow outlet 6 and valve pocket 7, delivery port 5 and backflow outlet 6 all are linked together with valve pocket 7, valve pocket 7 is linked together with the pump chamber through water inlet 4, be provided with the case subassembly in the valve pocket 7, and the top of valve pocket 7 has backflow cavity 8, backflow cavity 8 is linked together with delivery port 5 through backflow passage 9, pump head 1 still includes backflow inlet 10 that is linked together with the pump chamber, backflow outlet 6 and backflow inlet 10 are linked together through connecting pipe 11. Specifically, the valve core assembly comprises a valve rod 12, a valve ring 13, a gasket 14, a valve ball 15, a first spring 16 and a water inlet seat 17, a valve cover 19 is arranged at the top of the valve cavity 7, an elastic part used for pressing the valve rod 12 downwards on the valve ball 15 is arranged between the valve rod 12 and the valve cover 19, the water inlet seat 17 is fixedly arranged in the water inlet 4, the water inlet seat 17 is provided with a water inlet hole 18 communicated with the valve cavity 7, the first spring 16 is arranged between the valve ball 15 and the water inlet seat 17, the gasket 14 is arranged at the top of the valve ball 15, the valve ring 13 is fixedly sleeved on the valve rod 12, and the bottom end of the valve rod 12 penetrates through the gasket 14 and is always abutted against. The valve core assembly is used for controlling the on-off of the water outlet 5 and the backflow outlet 6, when water is pumped out, the water outlet 5 is opened, the backflow outlet 6 is closed, when the pumping is finished, the water outlet 5 is closed, and the water outlet 5 is communicated with the backflow outlet through a backflow hole. In addition, the valve core assembly in the embodiment can also be an existing three-way valve core assembly.

Further, the case subassembly still includes adjust knob 20, and valve rod 12 alternates on valve gap 19, and the upper portion of valve rod 12 is provided with the external screw thread, and adjust knob 20 connects in the upper end of valve rod 12 through the screw thread soon, and is provided with second spring 21 on adjust knob 20, and second spring 21 cover is established on valve rod 12, and is located between adjust knob 20 and valve gap 19. When the plunger pump is not operated, the bottom end of the second spring 21 is compressed and abutted against the valve cover 19, the pump pressure can be initially set through the adjusting knob 20 and the second spring 21,

further, the water outlet 5 and the backflow outlet 6 are respectively located on two sides of the valve cavity 7, and the water outlet 5 is located below the backflow outlet 6.

Further, a check valve 22 is disposed on the water outlet 5.

Further, three-way valve 3 sets up on the top of pump head 1, and water inlet tap 2 and backward flow entry 10 all set up the lower part at pump head 1, and backward flow entry 10 is located the below of water inlet tap 2.

Further, the pump head 1 is provided with a pressure gauge 23, the pressure gauge 23 is communicated with the pump cavity, and the pressure value in the pump cavity can be observed more visually.

The working principle of the embodiment is as follows: when water is pumped out by a pump, the gasket 13 drives the valve rod 12 to move upwards under the action of the first spring 16 and water pressure, the water outlet 5 is communicated with the valve cavity 7 and the pump cavity and begins to discharge water, and meanwhile, the valve ring 13 moves upwards along with the valve rod 12 to close the backflow outlet 6; when the pumping is finished, the valve ring 13 moves downwards in the process that the valve ring 13 descends along with the valve rod 12 to close the water outlet 5, the backflow outlet 6 is opened, and redundant liquid medicine in the valve cavity 7 flows back to the pump cavity from the backflow outlet 6.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a backflow structure of plunger pump, the plunger pump includes pump head (1), pump head (1) includes water inlet nozzle (2) and pump chamber, water inlet nozzle (2) and pump chamber are linked together, its characterized in that, backflow structure is including setting up three-way valve (3) on pump head (1), three-way valve (3) are including water inlet (4), delivery port (5), backward flow export (6) and valve pocket (7) that communicate each other, delivery port (5) and backward flow export (6) all are linked together with valve pocket (7), valve pocket (7) are linked together with the pump chamber through water inlet (4), be provided with the case subassembly in valve pocket (7), and the top of valve pocket (7) has chamber (8), backward flow chamber (8) are linked together with delivery port (5) through backflow passage (9), pump head (1) still includes backflow entrance (10) that are linked together with the pump chamber, the backflow outlet (6) is communicated with the backflow inlet (10) through a connecting pipe (11).

2. The backflow structure of the plunger pump according to claim 1, wherein the valve core assembly comprises a valve rod (12), a valve ring (13), a gasket (14), a valve ball (15), a first spring (16) and a water inlet seat (17), the water inlet seat (17) is fixedly arranged in the water inlet (4), the water inlet seat (17) is provided with a water inlet hole (18) communicated with the valve cavity (7), the first spring (16) is arranged between the valve ball (15) and the water inlet seat (17), the gasket (14) is arranged at the top of the valve ball (15), the valve ring (13) is fixedly sleeved on the valve rod (12), and the bottom end of the valve rod (12) passes through the gasket (14) and abuts against the valve ball (15).

3. The structure of the return flow of a plunger pump according to claim 2, characterized in that a valve cover (19) is provided at the top of the valve chamber (7), and an elastic member for pressing the valve stem (12) downward on the valve ball (15) is provided between the valve stem (12) and the valve cover (19).

4. The backflow structure of the plunger pump according to claim 3, wherein the valve core assembly further comprises an adjusting knob (20), the valve rod (12) is inserted on the valve cover (19), the adjusting knob (20) is screwed on the upper end of the valve rod (12) through threads, a second spring (21) is arranged on the adjusting knob (20), and the second spring (21) is sleeved on the valve rod (12) and is located between the adjusting knob (20) and the valve cover (19).

5. The backflow structure of the plunger pump according to claim 4, wherein the water outlet (5) and the backflow outlet (6) are respectively located at two sides of the valve cavity (7), and the water outlet (5) is located below the backflow outlet (6).

6. The backflow structure of a plunger pump according to claim 5, wherein a check valve (22) is provided on the water outlet (5).

7. The structure of a plunger pump for returning fluid according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein the three-way valve (3) is disposed at the top end of the pump head (1), the water inlet nozzle (2) and the return inlet (10) are both disposed at the lower portion of the pump head (1), and the return inlet (10) is located below the water inlet nozzle (2).

8. The return flow structure of a plunger pump according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein a pressure gauge (23) is provided on the pump head (1), and the pressure gauge (23) communicates with the pump chamber.