CN221195306U

CN221195306U - Low-friction reciprocating pump cluster

Info

Publication number: CN221195306U
Application number: CN202322745346.1U
Authority: CN
Inventors: 李红炜; 陈黄海; 葛永文; 请求不公布姓名
Original assignee: Shanghai Lile Bridgeman Hydraulic Machinery Co ltd
Current assignee: Shanghai Lile Bridgeman Hydraulic Machinery Co ltd
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-06-21
Anticipated expiration: 2033-10-13

Abstract

The utility model discloses a low-friction reciprocating pump cluster, which comprises a group of reciprocating pumps and a driving disc capable of transversely rotating/moving, wherein a group of bulges are arranged on the bottom surface of the driving disc. The positive pressure applied to the plug body by the protrusions pushes the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity and pressurizes fluid to be driven in the sealing cavity, so that sliding friction between the plug body and the cylinder barrel in the conventional reciprocating pump is changed into rolling friction, friction force between the plug body and the cylinder barrel is greatly reduced, friction heat production and temperature rise between the plug body and the cylinder barrel are further reduced, and technical defects of increased working energy consumption, reduced sealing and pressurizing effects, reduced service life and the like of the reciprocating pump caused by temperature rise are overcome. Meanwhile, because the reciprocating pump clusters are adopted, the driving disc transversely moves/rotates to uniformly drive the plug body to reciprocate, the volume of a single reciprocating pump and the driving fluid quantity can be reduced, the working requirement on the single reciprocating pump is reduced, and the service life of the reciprocating pump is prolonged.

Description

Low-friction reciprocating pump cluster

Technical Field

The utility model belongs to the technical field of fluid conveying, and particularly relates to a low-friction reciprocating pump cluster.

Background

In the field of fluid transport, including liquids and gases, many involve processes that require the fluid to be driven forward by pressure, typically by pressurizing the fluid using a Pump (Pump). Common pumps mainly include vane pumps such as Centrifugal pumps (Centrifugal pumps) and positive displacement pumps such as reciprocating pumps (Reciprocating pump). The impeller pump uses rotating blades to continuously boost pressure, drives fluid to move forwards, and is generally large in flow rate, relatively low in pressure boost amplitude and more suitable for outputting large-flow low-pressure fluid, such as a fan. The reciprocating pump is characterized in that a piston or a plunger is utilized to reciprocate in a cylinder barrel to change the volume of a sealed space in the cylinder barrel, further change the pressure of fluid in the cylinder barrel, and is matched with a one-way valve to open and close under the pressure, so that the fluid to be driven is sucked, pressurized and discharged, and the higher pressure requirement but the flow rate is relatively low, therefore, the reciprocating pump is more suitable for occasions requiring high-pressure low-volume liquid, such as a water/oil jet pump, when in operation, the high pressure in the fluid is converted into high speed, and the nearby low-speed fluid is sucked and driven to jointly advance in the injection, so that the purpose of increasing the flow rate is achieved. Because the liquid is incompressible, when the plug body compresses and conveys the liquid, the liquid can bear high pressure, and therefore high lift is obtained.

However, for a reciprocating pump, because the plunger or piston moves in a reciprocating manner against the inner wall of the cylinder barrel to generate sliding friction force, and because the fluid in the cylinder barrel needs to be pressurized, the sealing degree between the plug body and the cylinder barrel is required to be high, and the sliding friction force is further increased. The larger sliding friction force increases the movement resistance on one hand, and generates unnecessary energy consumption; on the other hand, friction generates heat, so that the plug body and the cylinder barrel are heated up rapidly, expand with heat and contract with cold, the extrusion degree between the plug body and the cylinder barrel is further increased, and the friction force is further increased, so that a positive feedback process is formed; if the internal structure is uneven, the expansion is uneven, so that the plug body and/or the cylinder barrel are deformed, and the degree of fit/tightness between the plug body and the cylinder barrel is reduced, so that the pressurizing effect on the fluid in the cylinder barrel is affected. Meanwhile, the service lives of the plug body and the cylinder barrel are obviously affected by high temperature.

Accordingly, there is a need for further improvements and enhancements in the art.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is directed to a low-friction reciprocating pump assembly, so as to solve the technical drawbacks of the prior art that the energy consumption of the reciprocating pump is increased, the sealing and pressurizing effects are reduced, and the service life is reduced due to the excessive sliding friction force between the plug body and the cylinder barrel of the reciprocating pump.

The utility model discloses a low-friction reciprocating pump cluster, which comprises a group of reciprocating pumps and a driving disc capable of transversely rotating/moving, wherein a group of protrusions are arranged on the bottom surface of the driving disc:

The reciprocating pump comprises a columnar cylinder barrel communicated with a sealing cavity, an axisymmetric plug body capable of sealing the cylinder barrel is arranged in the cylinder barrel, a symmetry axis transversely spans an opening of the cylinder barrel, and a rotating curved surface of the plug body is directly or indirectly connected with the bottom surface of the driving disc in an abutting manner through a bracket;

The sealing cavity is communicated with the inflow pipe through an inflow one-way valve and is used for sucking fluid to be driven from the outside; the outlet pipe is communicated with the outflow pipe through an outflow check valve and is used for discharging the fluid to be driven;

When the driving disc transversely rotates/moves, the bulge can press the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity;

And a return structure for urging the plug body to remain against the bottom surface.

According to the low-friction reciprocating pump cluster, positive pressure applied to the plug body by the protrusions pushes the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity, and fluid to be driven in the sealing cavity is pressurized, so that sliding friction between the plug body and the cylinder barrel in the conventional reciprocating pump is changed into rolling friction, friction force between the plug body and the cylinder barrel is greatly reduced, friction heat generation and heating between the plug body and the cylinder barrel are further reduced, and technical defects of increased working energy consumption, reduced sealing and pressurizing effects, reduced service life and the like of the reciprocating pump caused by heating are overcome. Meanwhile, the utility model adopts the reciprocating pump cluster, and the driving disc transversely moves/rotates to uniformly drive the plug body to reciprocate, so that the volume of a single reciprocating pump and the driving fluid quantity can be reduced, the working requirement on the single reciprocating pump is reduced, and the service life of the reciprocating pump is prolonged.

Preferably, the two ends of the bracket are respectively provided with an upper pulley and a lower pulley, and the upper pulley and the lower pulley are respectively abutted to the bottom surface and the rotating curved surface and used for driving the plug body to roll and translate along the inner wall surface of the cylinder barrel. The support is arranged between the driving disc and the plug body, so that after the outer surface of the plug body is pressed into the cylinder barrel, the plug body can also extend into the cylinder barrel to continuously abut against the plug body. And the pulleys are arranged at the two ends of the bracket and respectively abut against the bottom surface and the rotating curved surface, so that the sliding friction is reduced to rolling friction, and the friction force and friction loss are further reduced. The positive pressure of the support or the roller acting on the surface of the plug body points to the center of the circular section of the plug body and is positioned above the contact point (line) of the plug body on the inner wall surface of the cylinder barrel, and the generated moment drives the plug body to roll towards the sealing cavity.

Preferably, the device further comprises a fixed limiting ring, and the bracket is inserted into the limiting ring and can reciprocate up and down. The retainer ring, such as a ring with an opening slightly larger than the outer diameter of the bracket, is provided to constrain the bracket to translate up and down only within the retainer ring, and to transmit the convex pressure to the plug body to drive the plug body to roll around the contact point (wire).

In one embodiment, the plug body is a cylinder, and the opening section of the cylinder barrel is square. The length of the plug body along the axial direction can be increased by adopting the plug body of the cylinder, namely, the cross section area of the cylinder barrel is increased, and the cross section area is multiplied by the distance of the plug body moving along the wall surface of the cylinder barrel, so that the volume of fluid to be driven, which is compressed or reduced in the movement of the plug body, is obtained, and the cross section area is increased, so that the amount of fluid to be driven, which is driven by one compression stroke, can be increased.

In another embodiment, the plug body is a sphere, and the opening section of the cylinder barrel is circular. The plug body in a spherical shape is arranged, and the volume of the reciprocating pump is reduced by being opposite to that of the plug body in a cylinder shape, so that a plurality of reciprocating pumps can work side by side more conveniently.

In one embodiment, the return structure comprises an elastomer disposed in the seal cavity for urging the plug to roll and abut the protrusion. In this embodiment, an elastic body such as a spring or an elastic pad is used, and when the plug body moves toward the seal chamber under the pressing of the boss/bracket, the fluid to be driven in the seal chamber is pressed and discharged while the elastic body is compressed. When the highest point of the bulge moves away from the plug body/support, the plug body generates a movement trend away from the sealing cavity under the action of the resilience force of the elastic body, and the plug body is kept close to the bulge/support, so that the volume of the sealing cavity is enlarged, the pressure of fluid to be driven in the sealing cavity is reduced, and the outflow check valve is closed; at the same time, after the pressure in the sealing cavity is reduced to a negative value or lower than the closing threshold value of the inflow one-way valve, the inflow one-way valve is opened, and new fluid to be driven flows into the sealing cavity from the inflow pipe to prepare for the next compression stroke.

More preferably, the return structure further comprises a rigid body, one end of the elastic body is fixed on the inner wall of the cylinder body, and the other end is abutted to the plug body through the rigid body. In consideration of the fact that the plug body rotates, relative sliding exists between the elastic body and the plug body to generate sliding friction force, a rigid column is arranged between the elastic body and the plug body, and the surface of the rigid column is coated with a low friction coefficient coating, so that friction force is reduced, and friction heat generation is reduced.

In one embodiment, the return structure comprises a pressurizing device connected to the inflow tube for applying an initial pressure to the fluid to be driven in the inflow tube, the initial pressure being used to drive the fluid to be driven from the inflow check valve into the sealing cavity and to push the plug body against the protrusion. In the embodiment, the pressurizing device is used for pressurizing the interior of the inflow pipe to press the fluid to be driven into the sealing cavity, the negative pressure generated by the movement of the plug body to expand the volume of the sealing cavity sucks the fluid to be driven into the sealing cavity, and on one hand, the speed of the fluid to be driven entering the sealing cavity can be increased; on the other hand, the plug body is pushed to be kept abutting against the bulge, so that the next compression process is prepared; meanwhile, the defect that the effective volume of the sealing cavity is reduced by arranging the rebound device in the sealing cavity is avoided.

Preferably, the driving disc is a circular plate capable of rotating around the circle center, the protrusions are circumferentially arranged on the bottom surface, and when the driving disc rotates, the protrusions sequentially drive the plug body to roll in the cylinder barrel in a reciprocating mode. The reciprocating pump cluster can further increase the volume of fluid to be driven which is pressurized and driven in a single pass of the reciprocating pump. And provides overall reliability of operation of the reciprocating pumps without failure of the entire pressurized drive sequence due to one or two reciprocating pumps not operating.

More preferably, the reciprocating pumps are arranged in parallel in the circumferential direction, each inflow pipe is respectively connected to an inflow manifold, and/or each outflow pipe is respectively connected to an outflow manifold. The inflow pipes of the reciprocating pumps are mutually communicated and commonly connected to an external fluid source to be driven through an inflow header pipe so as to introduce the fluid to be driven; and/or the outflow pipes of the reciprocating pumps are mutually communicated and commonly connected to the outflow header pipe to output the pressurized fluid to be driven.

The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.

Drawings

FIG. 1 is a block diagram of the overall construction of a low friction reciprocating pump cluster of the present utility model;

FIG. 2 is an enlarged view of a single reciprocating pump in a low friction reciprocating pump cluster of the present utility model;

In the figure, a 1-inflow main pipe, a 2-outflow main pipe, a 5-reciprocating pump, a 10-driving disc, 11-bulges, a 15-plug body, a 20-cylinder barrel, a 21-inflow pipe, a 22-outflow pipe, a 23-inflow check valve and a 24-outflow check valve; 25-elastomer, 26-rigid body, 27-rotation point, 31-upper pulley, 33-bracket, 35-lower pulley.

Description of the embodiments

The utility model provides a low-friction reciprocating pump cluster, which aims to make the purposes, technical schemes and effects of the utility model clearer and more definite, and the utility model is further described in detail below by referring to the accompanying drawings and examples. 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 utility model.

The low friction reciprocating pump provided by the utility model, as shown in figure 1, comprises a driving disc 10 capable of transversely rotating/moving and a group of reciprocating pumps 5 below the driving disc 10, wherein a group of bulges 11 are arranged on the bottom surface of the driving disc 10, namely the surface facing the reciprocating pumps 5. In normal operation, the projections 11 are always in direct contact with the curved surface of rotation of the plug body 15 in each reciprocating pump 5, or indirectly via the brackets 33, in cooperation with the return structure provided in the reciprocating pump 5. At the same time, the plug body 15 is kept close to the wall surface of the cylinder 20 under the action of the transverse component of the pressing force of the bulge 11, and rolling is generated. That is, the height variation of the boss 11 drives the plug body 15 to reciprocate in the cylinder 20, changing the volume of the sealing chamber communicated with the other end of the cylinder 20 to suck and discharge the fluid to be driven. Wherein the inflow pipe 21 of each reciprocating pump 5 is connected to an inflow header pipe 1, and the inflow header pipe 1 is connected to a fluid source to be driven, so that the fluid to be driven is input into the sealed cavity; and/or each outflow pipe 22 is connected to an outflow manifold 2, and the outflow manifold 2 outputs the pressurized fluid to be driven outwards to complete the pressurized output process of the fluid to be driven.

The specific shape of the driving disc 10 and the specific arrangement of the protrusions 11 should be consistent with the arrangement of the groups of reciprocating pumps below, for example, each reciprocating pump is arranged in a rectangular square matrix, so that the driving disc 11 is square, and a plug 15 is aligned below each protrusion 11. The manner of translation of the drive disk 11 is also related to the arrangement of the array of lower reciprocating pump groups. The reciprocating pumps 5 in fig. 1 are arranged circumferentially, and the driving disk 10 is designed as a circular disk rotating around the center of a circle, and the protrusions 11 are also arranged circumferentially on the bottom surface of the driving disk 10. Thus, when the driving disc 10 rotates around the circle center, the bulge 11 sequentially drives the plug body 15 to roll reciprocally in the cylinder 20, so that the volume of the sealing cavity is changed, and the work of sucking and pressing out the fluid to be driven is completed.

The specific structure of the reciprocating pump 5 is shown in fig. 2, and the reciprocating pump comprises a hollow cylindrical cylinder 20 and an axisymmetric plug body 15 which is used for keeping the cylinder 20 sealed and can roll along the cylinder wall. The portion of the cylinder 20 away from the driving disc 10 forms or communicates with a sealing cavity, which may have the same shape as the cylinder 20, form a part of the cylinder 20, or may have a different shape from the cylinder 20, and form an extension of the cylinder 20, so long as the furthest moving position of the plug body 15 is ensured, the plug body 15 does not fall into the sealing cavity, and the return to the initial position is difficult.

The sealed cavity is communicated with the inflow pipe 21 through an inflow one-way valve 23 and is communicated with the outflow pipe 22 through an outflow one-way valve 24. The inflow check valve 23 allows fluid under pressure to flow from the inflow tube 21 into the sealed cavity only, while the outflow check valve 24 allows fluid under pressure to flow from the sealed cavity to the outflow tube 22 only. Among them, the check valve, particularly the pressure-driven opening and closing check valve, is a common prior art, and is not described in detail herein.

Wherein the plug body 15 can be a sphere or a cylinder, and the rotation shaft spans the opening of the cylinder 20; accordingly, the cylinder 20 is circular or square in cross section and is in transition fit with the cross-sectional shape of the plug body 15 including the rotation axis. I.e., neither an interference fit nor a clearance fit, because the interference fit will cause the plug body 15 to not roll in the cylinder 20, but the clearance fit will leak, causing a reduction in the tightness in the seal chamber, losing or weakening the driving and pressurizing effect on the fluid to be driven in the seal chamber.

The projection 11 may directly abut against the plug body 15, but it is preferable to indirectly abut against the curved surface of rotation through the bracket 33, in view of the fact that the highest point may be deep into the cylinder 20. In particular, a fixed-position stop collar is provided, in which the support 33 is inserted and can be reciprocally moved up and down by the projection 11 in cooperation with the return structure. As shown in fig. 2, the bracket 33 is preferably provided with pulley structures at both ends, that is, an upper pulley 31 abutting against the bottom surface or the protrusion 11 and a lower pulley 35 abutting against the curved surface of rotation. Because relative displacement exists between the bulge 11 and the bracket 33 and between the bracket 33 and the plug body 15, friction force can be generated, so that a pulley structure is increased, sliding friction is changed into rolling friction, and friction force is greatly reduced; further, the friction force between the lower pulley 35 and the plug body 15 is the same as the moment of the positive pressure of the lower pulley 35 against the plug body 15 (counterclockwise in fig. 2), and thus helps to drive the plug body 15 to roll in the direction of the seal chamber.

The return structure may be, in one embodiment, as shown in fig. 2, an elastic body 25, such as a spring or a resilient pad, or other means that returns to its original length and outputs an elastic force after being compressed, disposed in the seal cavity. This compresses the elastomer 25 as the plug body 15 rolls against the seal cavity under pressure from the boss 11. When the driving disc 10 translates to drive the highest point of the protrusion 11 to leave the plug body 15, the elastic body 25 rebounds to push the plug body 15 back towards the driving disc 10 so as to keep the plug body 15 abutting against the protrusion 11. This increases the volume of the seal chamber, reducing the pressure in the seal chamber, even to negative pressure. When the pressure in the sealing chamber is lower than the closing pressure threshold of the inflow non-return valve 23, the inflow non-return valve 23 is opened and new fluid to be driven flows from the inflow pipe 21 into the sealing chamber, ready for the next stroke.

In a preferred embodiment, as shown in fig. 2, it is contemplated that the elastomer 25 is always held under pressure against the plug 15, and that the rolling motion of the plug 15 has a relative movement with respect to the elastomer 25, creating friction. In order to reduce friction, a rigid body 26 may be added between the elastic body 25 and the plug body 15, and the surface of the rigid body 26 may be coated with a low friction coating. Specifically, the elastic body 25 is an elastic body, such as a spring, one end of which is fixed to the inner wall surface of the cylinder, and the other end of which is fixedly connected to the rigid body 26, and the rigid body 26 is then abutted against the plug 15.

In one embodiment, considering that the volume of the sealing chamber is directly related to the discharge amount of the reciprocating pump 5, the elastic body 25 is not arranged in the sealing chamber, but a pressurizing device is connected to the inflow pipe 21, an initial pressure is applied to the fluid to be driven in the inflow pipe 21 in advance through the pressurizing device, when the highest point of the protrusion 11 leaves the plug body 15, the pressure in the sealing chamber is reduced, and the fluid to be driven in the inflow pipe 21 pushes up the inflow one-way valve 23 under the initial pressure and actively flows into the sealing chamber. At the same time, the initial pressure further pushes the plug body 15 to generate a movement trend of leaving the sealing cavity, so as to keep the plug body 15 abutting against the protrusion 11, expand the volume of the sealing cavity or reduce the pressure in the sealing cavity, and further ensure the friction force between the lower pulley 35 and the plug body 15.

Under the combined action of the projection 11 and the return structure, the plug body 15 can roll back and forth in the cylinder 20 along a rotation point 27. Along with the rotation/translation of the driving disc 10, from the bottom surface of the driving disc 10 to the top of the protrusion 11, the protrusion 11 sequentially abuts against and presses the plug body 15, so that the plug body 15 is pushed to move downwards in rolling, namely, move towards the sealing cavity in a translating manner, the fluid to be driven in the sealing cavity is pressed, the pressure of the fluid to be driven in the sealing cavity is increased, the inflow check valve 23 is pressed to be closed at first, the pressure is further increased, the outflow check valve 24 is pressed to be opened, the pressurized fluid to be driven is pressed out, and the pressurizing and discharging process of the fluid to be driven is completed. The rotation point 27 is a contact point between the plug 15 and the inner wall surface of the cylinder 20, and changes along with the change of the moving position of the plug 15 on the cylinder wall, and naturally, if the plug 15 is a cylinder, the contact point forms a rotation line.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. A low friction reciprocating pump cluster comprising a set of reciprocating pumps and a laterally rotatable/movable drive plate, the bottom surface of the drive plate being provided with a set of protrusions:

2. The reciprocating pump cluster according to claim 1, wherein two ends of the bracket are respectively provided with an upper pulley and a lower pulley, which are respectively abutted against the bottom surface and the rotating curved surface, and are used for driving the plug body to roll and translate along the inner wall surface of the cylinder barrel.

3. The reciprocating pump assembly of claim 1 or 2, further comprising a fixed stop collar, said bracket being inserted into said stop collar for reciprocal movement up and down.

4. A reciprocating pump cluster according to claim 1 or 2, wherein the plug body is a cylinder and the cylinder barrel has a square open cross-section.

5. A reciprocating pump cluster according to claim 1 or 2, wherein the plug body is a sphere and the cylinder barrel has a circular open cross-section.

6. A reciprocating pump assembly according to claim 1 or 2, wherein the return structure comprises an elastomer provided to the seal chamber for urging the plug body to roll and abut the projection.

7. The reciprocating pump assembly of claim 6 wherein said return structure further comprises a rigid body, one end of said elastomer being secured to the cylinder inner wall and the other end being abutted to said plug body by said rigid body.

8. A reciprocating pump assembly according to claim 1 or 2, wherein the return structure comprises a pressurizing means connected to the inflow tube for applying an initial pressure to the fluid to be driven in the inflow tube, the initial pressure being used to drive the fluid to be driven from the inflow one-way valve into the sealed cavity and to urge the plug body against the projection.

9. The reciprocating pump cluster according to claim 1 or 2, wherein the driving disc is a circular plate capable of rotating around a circle center, the protrusions are circumferentially arranged on the bottom surface, and when the driving disc rotates, the protrusions sequentially drive the plug body to reciprocate in the cylinder barrel.

10. The reciprocating pump assembly of claim 9, wherein each of said reciprocating pumps is circumferentially parallel, each of said inlet pipes being respectively connected to an inlet manifold and/or each of said outlet pipes being respectively connected to an outlet manifold.