CN220667795U

CN220667795U - Plunger pump

Info

Publication number: CN220667795U
Application number: CN202322204346.0U
Authority: CN
Inventors: 陈灵刚; 刘叶芝; 韩伟玉; 金作斌; 刘叶勇
Original assignee: Yuhuan Aoheng Machinery Co ltd
Current assignee: Yuhuan Aoheng Machinery Co ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-26
Anticipated expiration: 2033-08-15

Abstract

The utility model provides a plunger pump, and belongs to the technical field of machinery. It has solved the not good problem of current plunger pump seal. The plunger pump comprises a pump body with an oil inlet and an oil outlet, wherein a plunger capable of moving in the pump body is arranged in the pump body in a penetrating manner, a reset spring capable of enabling the plunger to move outwards and reset is further arranged in the pump body, a rod-shaped limiting rod is arranged in the pump body, the inner end of the limiting rod abuts against the inner wall of the pump body, the inner end of the plunger stretches into the pump body and is sleeved on the outer side of the limiting rod, a leather cup is further arranged on the inner wall of the pump body, the leather cup is closer to the inner end of the limiting rod than the oil inlet, and when the plunger moves towards the inner end direction, the outer side face of the plunger can abut against and seal with the leather cup. The plunger pump has the advantage of good sealing performance.

Description

Plunger pump

Technical Field

The utility model belongs to the technical field of machinery, and relates to a plunger pump.

Background

Plunger pumps are an important device of hydraulic systems. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity, so as to realize oil absorption and pressure oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.

In the use of the existing plunger pump, more impurities exist in oil liquid, and the face-sealed sealing piece is often adopted for sealing of the plunger pump, so that the oil liquid contacts with the sealing piece in the reciprocating movement process of the plunger, and the impurities remain at the sealing piece to influence the sealing effect of the sealing piece, so that the normal use of the plunger pump is influenced.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a plunger pump which solves the problem of poor sealing of the conventional plunger pump.

The aim of the utility model can be achieved by the following technical scheme:

the plunger pump comprises a pump body with an oil inlet and an oil outlet, wherein a plunger capable of moving in the pump body is arranged in the pump body in a penetrating manner, and a reset spring capable of enabling the plunger to move outwards and reset is further arranged in the pump body.

In the working process of the plunger pump, the plunger is internally moved to press oil, the plunger is externally moved to absorb oil, in the working process, the leather cup is used for providing sealing between the outer side surface of the plunger and the inner wall of the pump body, and the sealing mode of the leather cup is linear sealing, so that the sealing area is reduced, the condition that the sealing effect is influenced due to the fact that impurities in oil liquid remain is avoided, and the problem that the sealing effect is poor is solved.

In the above-mentioned plunger pump, plunger inner end tip has concave shrinkage pool first, the lateral part of plunger inner runs through and has seted up several inlet port, the outer end of gag lever post stretches into in shrinkage pool first and have the clearance between the lateral wall of gag lever post and shrinkage pool first, the outer end tip of gag lever post has concave shrinkage pool second, the gag lever post is located the lateral wall department of shrinkage pool second and runs through and has seted up the through-hole. The arrangement of the first concave hole, the second concave hole and the through hole can provide a path for exhausting air and discharging oil for the plunger and the limiting rod to move in opposite directions, so that the resistance is reduced.

In the above-mentioned plunger pump, the inboard of plunger inner has inwards to bulge and is annular fender shoulder, still be provided with in the plunger and be annular spring holder and this spring seat cover is established the outside of gag lever post, reset spring cover is established the outside of gag lever post, and reset spring's one end stretches into in the shrinkage pool one and support and lean on the spring holder, the spring holder can support under reset spring's elasticity effect and support and lean on keeping off the shoulder. The spring acts on the stop shoulder of the plunger through the spring seat, so that acting force is more uniform.

In the plunger pump, an annular clamping ring is fixed on the outer side of the outer end of the limiting rod, the outer diameter of the clamping ring is smaller than the inner diameter of the retaining shoulder, and the spring seat can be abutted against the clamping ring under the action of the elastic force of the return spring. The snap ring is used for limiting the spring seat, avoiding the spring seat from being entirely separated, and being limited at the position of the snap ring only after the plunger is far away from.

In the above-described plunger pump, the spring seat may have a tapered surface on an inner side thereof, the tapered surface being capable of abutting against the retainer ring. The conical surface is more beneficial to positioning.

In the plunger pump, the inner end of the limiting rod is provided with an annular abutting part protruding outwards, and the return spring abuts against the abutting part relative to the other end of the plunger. The provision of the abutment makes the spring abutment more stable.

In the plunger pump, the valve cover, the valve core and the one-way spring are arranged at the oil outlet of the pump body, the oil outlet hole which is communicated with the oil outlet and the inner cavity of the pump body is formed in the valve cover in a penetrating manner, the valve core can be propped against the valve cover and block the oil outlet hole under the elastic force action of the one-way spring, the valve core can overcome the elastic force of the one-way spring under the oil pressure action of the inner cavity of the pump body and move to enable the oil outlet hole to be communicated, the oil passing hole which is communicated with the oil outlet and the inner cavity of the pump body is formed in the valve cover in a penetrating manner, and the aperture of the oil passing hole is smaller than that of the oil outlet hole. The valve core and the spring are arranged, so that oil is prevented from being sucked from the oil outlet when the plunger moves outwards.

In the above-mentioned plunger pump, the inner chamber quantity of the pump body is two and sets up side by side, still has the intercommunicating pore that can communicate two inner chambers in the pump body, two the inner chamber all is provided with above-mentioned plunger, gag lever post and reset spring, the port department of intercommunicating pore is provided with the balanced case that can block the intercommunicating pore, the inner of balanced case stretches into in the pump body just can promote when the plunger is in the plunger balanced case withdraws into the intercommunicating pore and makes the intercommunicating pore switch on. The double-cavity plunger pump realizes double-cavity balance through the structures of the communication hole and the balance valve core.

In the above plunger pump, the side wall of the pump body is also provided with a mounting hole for mounting the alarm. The alarm can be selectively installed according to the requirement, and if not installed, the alarm can be blocked.

Compared with the prior art, in the working process of the plunger pump, the limiting rod provides a guide for the movement of the plunger, the leather cup provides a seal between the outer side surface of the plunger and the inner wall of the pump body, and the sealing mode of the leather cup avoids the sealing for a line, so that the sealing area is reduced, the condition that the sealing effect is influenced due to the fact that impurities remain in oil is avoided, and the problem that the sealing effect is poor is solved.

Drawings

Fig. 1 is a schematic cross-sectional view of the present plunger pump.

In the figure, 1, an oil inlet; 2. an oil outlet; 3. a pump body; 4. a plunger; 5. a return spring; 6. a limit rod; 7. a leather cup; 8. concave hole I; 9. an oil inlet hole; 10. concave holes II; 11. a through hole; 12. a shoulder; 13. a spring seat; 14. a clasp; 15. an abutting portion; 16. a valve cover; 17. a valve core; 18. a one-way spring; 19. an oil outlet hole; 20. an oil passing hole; 21. a communication hole; 22. a balance valve core; 23. and (5) mounting holes.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, the plunger pump comprises a pump body 3 with an opening at one end, an oil inlet 1 is formed in the side part of the pump body 3, and an oil outlet 2 is formed in the other end of the pump body 3 opposite to the opening. A columnar plunger 4 capable of moving into the pump body 3 is arranged in the opening of the pump body 3 in a penetrating manner, a long rod-shaped limiting rod 6 and a reset spring 5 capable of enabling the plunger 4 to move outwards and reset are further arranged in the pump body 3, and the limiting rod 6 and the plunger 4 are coaxially arranged.

The inner end of the limiting rod 6 abuts against the inner wall of the pump body 3, which is close to the oil outlet 2, the inner end of the plunger 4 stretches into the pump body 3 and is sleeved outside the limiting rod 6, a leather cup 7 is further fixed on the inner wall of the pump body 3, the leather cup 7 is closer to the inner end of the limiting rod 6 than the oil inlet 1, and when the plunger 4 moves towards the inner end direction, the outer side face of the plunger 4 can abut against the leather cup 7 to be sealed.

Specifically, the end part of the inner end of the plunger 4 is provided with a concave hole I8, a plurality of oil inlet holes 9 are formed in the side part of the inner end of the plunger 4 in a penetrating manner, the plurality of oil inlet holes 9 are distributed circumferentially around the axis of the plunger 4, and the plurality of oil inlet holes 9 can be communicated with the oil inlet 1. The outer end of the limiting rod 6 stretches into the concave hole I8, a gap is reserved between the outer side of the limiting rod 6 and the side wall of the concave hole I8, the end part of the outer end of the limiting rod 6 is provided with a concave hole II 10, and a through hole 11 is formed in the position, located on the side wall of the concave hole II 10, of the limiting rod 6.

The inner side of the inner end of the plunger 4 is provided with a retaining shoulder 12 protruding inwards to form a circular ring shape, the plunger 4 is internally provided with a circular ring-shaped spring seat 13, the spring seat 13 is sleeved outside the limiting rod 6, the reset spring 5 is sleeved outside the limiting rod 6, one end of the reset spring 5 stretches into the concave hole I8 and abuts against the spring seat 13, and the spring seat 13 can abut against the retaining shoulder 12 under the action of the elastic force of the reset spring 5. In the embodiment, a circular clamping ring 14 is fixed on the outer side of the outer end of the limiting rod 6, the outer diameter of the clamping ring 14 is smaller than the inner diameter of the retaining shoulder 12, and when the plunger 4 moves outwards until the retaining shoulder 12 exceeds the clamping ring 14, the spring seat 13 can be abutted against the clamping ring 14 under the action of the elasticity of the return spring 5, so that the limiting of the spring seat 13 is realized; the spring seat 13 has a tapered surface on the inner side thereof, which can abut against the retainer ring 14.

The inner end of the limit rod 6 is provided with an outward convex annular abutting part 15, and the other end of the return spring 5 opposite to the plunger 4 abuts against the abutting part 15. The end part of the inner end of the limiting rod 6 is provided with a concave oil passing concave hole, and the side part of the inner end of the limiting rod 6 is provided with a side hole which is communicated with the inner cavity of the pump body 3 and the oil passing concave hole. Still be provided with valve gap 16, case 17 and one-way spring 18 in the pump body 3 between the shrinkage pool that crosses of gag lever post 6 and the oil-out 2, valve gap 16 covers oil-out 2, and the last oil outlet 19 of having seted up intercommunication oil-out 2 and crossing the shrinkage pool that crosses of valve gap 16, case 17 can support and lean on valve gap 16 and shutoff oil outlet 19 under the elasticity effect of one-way spring 18, and case 17 can overcome the elasticity removal of one-way spring 18 and make oil outlet 19 switch on under the oil pressure effect of pump body 3 inner chamber, still run through on the valve gap 16 and set up the oil hole 20 that crosses the intercommunication oil-out 2 and cross the shrinkage pool that crosses, the aperture of oil hole 20 is less than the aperture of oil outlet 19 far away.

In the working process of the plunger pump, when the plunger 4 moves to the oil inlet hole 9 beyond the leather cup 7, the oil inlet 1 is not communicated with the inner cavity of the pump body 3, and the oil pressure in the inner cavity of the pump body 3 rises along with the continuous movement of the plunger 4 to push the valve core 17 to be opened, so that the oil is sent out from the oil outlet 2 to realize the oil pressing; otherwise, the valve core 17 blocks the oil outlet 2, the plunger 4 moves outwards, and oil at the oil inlet 1 is sucked into the pump body 3.

In the working process, the sealing is provided between the outer side surface of the plunger 4 and the inner wall of the pump body 3 by the leather cup 7, and the sealing mode of the leather cup 7 is linear sealing, so that the sealing area is reduced, and the condition that the sealing effect is influenced due to the fact that impurities in oil liquid remain is avoided.

In addition, the plunger pump is of a double-cavity structure and is provided with two cavities which are arranged in parallel, and the structures of the two cavities are the same and are not repeated. The pump body 3 is also internally provided with a communication hole 21 which can be communicated with the two inner cavities, a balance valve core 22 which can block the communication hole 21 under the action of the elasticity of a balance spring is arranged at the port of the communication hole 21, the inner end of the balance valve core 22 stretches into the pump body 3, and when the plunger 4 moves inwards, the balance valve core 22 can be pushed to retract into the communication hole 21 against the action of the elasticity of the balance spring, so that the communication hole 21 is conducted. The side wall of the pump body 3 is also provided with a mounting hole 23 for mounting an alarm.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The plunger pump comprises a pump body (3) with an oil inlet (1) and an oil outlet (2), wherein a plunger (4) capable of moving towards the inside of the pump body (3) is penetrated in the pump body (3), a reset spring (5) capable of enabling the plunger (4) to move outwards and reset is further arranged in the pump body (3), and the plunger pump is characterized in that a rod-shaped limiting rod (6) is arranged in the pump body (3), the inner end of the limiting rod (6) abuts against the inner wall of the pump body (3), the inner end of the plunger (4) stretches into the pump body (3) and is sleeved on the outer side of the limiting rod (6), a leather cup (7) is further arranged on the inner wall of the pump body (3), compared with the oil inlet (1), the leather cup (7) is closer to the inner end of the limiting rod (6), when the plunger (4) moves towards the inner direction, the outer side surface of the plunger (4) abuts against and seals, the inner end of the plunger (4) is provided with a concave hole (8), the inner end (8) and the inner end of the plunger (4) is provided with a concave hole (8) and the inner end (6) which stretches out of the concave hole (6), the outer end part of the limiting rod (6) is provided with a concave hole II (10), a through hole (11) is formed in the side wall of the limiting rod (6) at the concave hole II (10) in a penetrating way, an annular blocking shoulder (12) protruding inwards is arranged at the inner side of the inner end of the plunger (4), an annular spring seat (13) is further arranged in the plunger (4) and sleeved outside the limiting rod (6), a return spring (5) is sleeved outside the limiting rod (6), and one end of reset spring (5) stretches into in shrinkage pool one (8) and support and lean on spring holder (13), spring holder (13) can support under reset spring (5) elasticity effect keep off on shoulder (12), the outside of gag lever post (6) outer end is fixed with and is annular snap ring (14), the external diameter of snap ring (14) is less than keep off the internal diameter of shoulder (12), spring holder (13) can support under reset spring (5) elasticity effect and lean on snap ring (14).

2. Plunger pump according to claim 1, characterized in that the inside of the spring seat (13) has a conical surface which can abut against the snap ring (14).

3. Plunger pump according to claim 1 or 2, characterized in that the inner end of the stop lever (6) has an outwardly protruding annular abutment (15), the other end of the return spring (5) opposite the plunger (4) abutting against the abutment (15).

4. The plunger pump according to claim 1 or 2, characterized in that a valve cover (16), a valve core (17) and a one-way spring (18) are arranged at the oil outlet (2) of the pump body (3), an oil outlet hole (19) for communicating the oil outlet (2) with the inner cavity of the pump body (3) is formed in the valve cover (16) in a penetrating mode, the valve core (17) can be abutted to the valve cover (16) under the action of elastic force of the one-way spring (18) and is used for blocking the oil outlet hole (19), the valve core (17) can overcome the elastic force of the one-way spring (18) under the action of oil pressure of the inner cavity of the pump body (3) and enable the oil outlet hole (19) to be conducted, an oil passing hole (20) for communicating the oil outlet (2) with the inner cavity of the pump body (3) is formed in a penetrating mode on the valve cover (16), and the aperture of the oil passing hole (20) is smaller than the aperture of the oil outlet hole (19).

5. Plunger pump according to claim 1 or 2, characterized in that the number of the cavities of the pump body (3) is two and the cavities are arranged in parallel, a communication hole (21) capable of communicating the two cavities is also formed in the pump body (3), the two cavities are provided with the plunger (4), the limit rod (6) and the return spring (5), a balance valve core (22) capable of blocking the communication hole (21) is arranged at the port of the communication hole (21), the inner end of the balance valve core (22) stretches into the pump body (3), and when the plunger (4) moves inwards, the balance valve core (22) can be pushed to retract into the communication hole (21) and the communication hole (21) is communicated.

6. Plunger pump according to claim 1 or 2, characterized in that the side wall of the pump body (3) is also provided with mounting holes (23) for mounting alarms.