CN117090764A - Low-friction reciprocating pump, cluster and working method - Google Patents

Abstract

The invention discloses a low-friction reciprocating pump, a cluster and a working method, wherein the reciprocating pump comprises a hollow cylinder body and a driving plate capable of transversely moving, and a protruding part is arranged on the lower surface of the driving plate: the cylinder body comprises a columnar cylinder barrel communicated with a sealing cavity, a rotationally symmetrical 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 rotation curved surface of the plug body is abutted to the protruding part; when the driving plate transversely translates, the protruding part can press the plug body to roll from the initial position to the sealing cavity along the inner wall surface of the cylinder barrel; and a return structure for pushing the plug body to return to the initial position. The rolling plug body is used for pressurizing fluid to be driven in the sealing cavity, 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 reduced, friction heat production and heating 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.

Description

Low-friction reciprocating pump, cluster and working method

Technical Field

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

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 invention is directed to a low-friction reciprocating pump, a cluster and a working method thereof, 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 invention discloses a low-friction reciprocating pump, which comprises:

a hollow cylinder body and a drive plate capable of transversely moving, wherein the lower surface of the drive plate is provided with a protruding part:

the cylinder body 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 abutted against the protruding part;

the sealed cavity is communicated with the suction pipe through the inflow one-way valve and is used for sucking fluid to be driven from the outside; the discharge pipe is communicated with the outflow check valve and is used for discharging the fluid to be driven;

when the driving plate transversely translates, the protruding part can press the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity;

a return structure is also included for urging the plug body to remain in abutment with the boss.

According to the low-friction reciprocating pump, the positive pressure applied to the plug body by the convex part pushes the plug body to roll along the inner wall surface of the cylinder barrel facing 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.

Preferably, the boss includes an elongate end portion abutting the plug body for driving the plug body in rolling and translating. The part of the protruding part adjacent to the plug body is designed to be slender, so that the protruding part can be more conveniently kept in abutting connection with the plug body, and particularly, when the plug body is pushed into the cylinder barrel, the slender end part can be more easily and partially penetrated into the cylinder barrel, and the protruding part can be kept in abutting connection with the plug body. Preferably, the elongated end portion may also be added with a rotatable design, such as adding a rotatable drive wheel. Because when the driving plate moves forward, though the positive pressure (normal direction, namely, the curved surface perpendicular to the plug body and pointing to the circle center of the circular section of the plug body) of the direct contact between the protruding part and the plug body can drive the plug body to rotate around the rotating point of the plug body on the front wall, which is contacted with the cylinder barrel, towards the direction of the sealing cavity, but the friction force between the protruding part and the plug body drives the plug body to roll around the rotating point towards the direction deviating from the sealing cavity, so the rolling direction of the plug body can be changed into the rolling direction towards the direction of the sealing cavity by adding the driving wheel, the friction force between the plug body and the contact point of the cylinder barrel can be further reduced, and the friction heat generation is reduced.

Preferably, the plug body is a cylinder, and the opening section of the cylinder barrel is rectangular. 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.

Preferably, 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 elastic device arranged in the sealing cavity, and the elastic device is used for pushing the plug body to move and abut against the protruding part. In this embodiment, an elastic means 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, the fluid to be driven in the seal chamber is pressed and discharged while the elastic means is compressed. When the highest point of the bulge part moves away from the plug body, the plug body generates a movement trend away from the sealing cavity under the action of the resilience force of the elastic device, and the bulge part is kept in close contact with the plug body, 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 suction pipe to prepare for the next compression stroke.

More preferably, the elastic means comprise an elastomer fixed to the inner wall of the cylinder, said elastomer abutting said plug by a rigid post. Because the plug body rotates, the elastic device and the plug body slide relatively to generate sliding friction force, and a rigid column is arranged between the elastic device and the plug body, so that the contact area is reduced, and friction heat generation is reduced.

In one embodiment, the return structure comprises a pressurizing device connected to the suction tube for applying an initial pressure to the fluid to be driven in the suction tube, the initial pressure being used to drive the fluid to be driven from the inflow check valve into the sealing chamber and to push the plug body against the boss. In the embodiment, the pressurizing device is used for pressurizing the suction pipe to press the fluid to be driven into the sealing cavity instead of moving the plug body, so that the volume of the sealing cavity is enlarged, the generated negative pressure 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 in contact with the convex part, 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.

The invention also discloses a reciprocating pump cluster, which comprises at least two reciprocating pumps, wherein each suction pipe is communicated with each other, and each discharge pipe is communicated with each other; the driving plates are connected into a whole and synchronously move. The reciprocating pump cluster is characterized in that a plurality of reciprocating pumps are arranged in parallel, and suction pipes of the reciprocating pumps are mutually communicated and commonly connected to an external inflow pipe; the discharge pipes of the respective reciprocating pumps are also connected to each other and to an external outflow pipe. This can further increase the volume of fluid to be driven that 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.

Preferably, the driving plates are connected with each other to form cylindrical surfaces, and the lower surface is positioned inside the cylindrical surfaces; the cylinder barrel is circumferentially arranged in the cylindrical surface, and each plug body is abutted against each protruding portion. Each reciprocating pump is arranged according to the shape of a cylinder, the plug body is outwards abutted to each protruding portion of the driving plate, the sealing cavity is located in the cylinder, the size of the whole reciprocating pump cluster is reduced, the driving plate is conveniently driven to rotate from the outside, the protruding portions translate relative to each plug body, and the plug body is pushed to roll and translate along the cylinder barrel.

The invention further discloses a working method of the reciprocating pump, which comprises the following steps:

A. the driving plate transversely moves, and the protruding part presses the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity;

B. the plug body compresses the fluid to be driven in the sealing cavity until the pressure in the cavity to be sealed is higher than the opening pressure of the outflow check valve; the inflow one-way valve is closed under the action of the increased pressure in the sealing cavity;

C. the outflow check valve is opened, and the fluid to be driven flows out of the discharge pipe;

D. the pressure in the sealing cavity is reduced, and the outflow check valve is closed. At this time, the return structure drives the plug body to still keep abutting against the protruding part, namely drives the plug body to leave the sealing cavity, and further reduces the pressure in the sealing cavity;

E. the inflow check valve is opened, and fluid to be driven flows into the sealing cavity from the suction pipe. When the pressure in the sealing cavity is lower than the closing pressure of the inflow one-way valve, the inflow one-way valve is opened. This may be lifted by the positive pressure that is always present in the suction pipe, i.e. the fluid to be driven is driven into the sealed cavity by the positive pressure generated by the pressurizing means; it is also possible to suck the fluid to be driven from the suction pipe by sucking in the inflow check valve at a low pressure in the seal chamber.

The sliding friction between the plug body and the cylinder barrel in the prior art is changed into rolling friction, so that the sealing performance of the sealing cavity is ensured, meanwhile, the friction force and friction heat generation between the plug body and the cylinder barrel are greatly reduced, the sealing performance of the reciprocating pump is maintained, and the working effect and the service life of the reciprocating pump are prolonged.

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

Drawings

FIG. 1 is an overall block diagram of a first embodiment of a low friction reciprocating pump of the present invention;

FIG. 2 is an overall block diagram of a second embodiment of the low friction reciprocating pump of the present invention;

FIG. 3 is an overall block diagram of a third embodiment of a low friction reciprocating pump of the present invention;

FIG. 4 is a cross-sectional view showing an operation state of a third embodiment of the low friction reciprocating pump of the present invention;

FIG. 5 is an overall block diagram of one embodiment of a low friction reciprocating pump cluster of the present invention;

in the figure, a 5-plug body, a 10-round plunger, a 15-ball plug, a 20-cylinder barrel, a 21-suction pipe, a 22-discharge pipe, a 23-inflow check valve and a 24-outflow check valve are shown; 25-elastic device, 26-rotation point, 27-inflow pipe, 28-outflow pipe, 30-driving plate, 31-bulge, 33-bracket, 35-driving wheel, 50-reciprocating pump, d-rotation power arm, h-translation distance, R-driving wheel radius, N-acting force, R-ball plug radius and alpha-included angle.

Description of the embodiments

The invention provides a low-friction reciprocating pump, a cluster and a working method, and aims to make the purposes, the technical scheme and the effects of the invention clearer and more definite. 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.

The present invention provides a low friction reciprocating pump, as shown, comprising a transversely translatable drive plate 30 and a cylinder below the drive plate 30. The cylinder body comprises a hollow columnar cylinder 20 and an axisymmetric plug body 5 for keeping and sealing the cylinder 20, and the plug body 5 is opposite to the lower surface of the driving plate 30. The plug body 5 can roll back and forth along the cylinder wall in the cylinder 20 under drive. And the portion of the cylinder 20 remote from the driving plate 30 constitutes or communicates with a sealed chamber which communicates with the suction pipe 21 through the inflow check valve 23 and with the discharge pipe 22 through the outflow check valve 24. The inflow check valve 23 allows fluid under pressure to flow from the suction pipe 21 into the sealed chamber only, while the outflow check valve 24 allows fluid under pressure to flow from the sealed chamber to the discharge pipe 22 only, through the elastic structure. Among them, the check valve is a common prior art, and is not described in detail herein.

A first embodiment of the present invention is shown in fig. 1, wherein the plug body 5 adopts a cylindrical plunger 10, and the opening section of the cylinder 20, corresponding to the cross section of the plunger 10 along the rotational symmetry axis, is configured as a close-fitting rectangle; wherein the maximum cross section of the cylinder 10, i.e. the cross section comprising the axis of rotation (area equal to cylinder diameter times cylinder length), completely encloses the cylinder barrel 20. Of course, the sealing cavity 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 farthest position of the plug body 5 is ensured not to fall into the sealing cavity, and it is difficult to restore the plug body 5 to the initial position.

At the lower surface of drive plate 30, be provided with a bellying 31, when drive plate 30 translation, bellying 31 from bottom to top butt in proper order and oppression cock body 5, promote cock body 5 to descend in the roll, translate towards the sealed chamber promptly, just can oppress the fluid of waiting in the sealed chamber, increase the pressure of waiting to drive fluid in the sealed chamber.

In the first embodiment, the portion of the cylinder 10 exposed from the cylinder 20 is abutted against the boss 31, so that when the driving plate 30 translates, the pressure and friction force of the boss 31 on the curved surface of the cylinder 10 drive the cylinder 10 to roll on the inner wall surface of the cylinder 20 (specifically, the inner wall surface is the front wall surface of the cylinder 20 in the moving direction of the driving plate 30, the contact point between the inner wall surface and the cylinder 10 forms the rotation point 27, and for the cylinder 10, one contact line) but the pressure and friction force are opposite to the direction in which the cylinder 10 drives to roll.

The second embodiment of the invention, shown in figure 2, is similar in basic construction to the first embodiment but employs a ball-type plug body, ball plug 15. Accordingly, the cylinder 20 is circular in cross section. Similarly, when the drive plate 30 is moved laterally by an external force, the pressure drives the ball plunger 15 to rotate and force the ball plunger 15 to move toward the seal cavity, again because the boss 31 is in close proximity to the ball plunger 15.

To ensure that the plug body 5 abuts against the boss 31, the reciprocating pump of the present invention is further provided with a return structure, for example, in one embodiment, as shown in fig. 3, a resilient means 25, such as a spring or a resilient pad or other means that returns to its original length and outputs a resilient force after being compressed, disposed in the seal cavity. This compresses the resilient means 25 as the plug body rolls towards the seal cavity under the pressure of the boss 31. When the driving plate 30 translates to drive the highest point of the protruding portion 31 to leave the plug body 5, the elastic device 25 rebounds to push the plug body 5 back towards the driving plate 30, so as to keep the plug body 5 abutting against the protruding portion 31. 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 below the closing pressure threshold of the inflow non-return valve 2, the inflow non-return valve 23 opens and new fluid to be driven flows from the suction pipe 21 into the sealing chamber, ready for the next stroke.

Considering that the elastic means 25 always remain under pressure against the plug body, the rolling of the plug body 5 has a relative movement with respect to the elastic means 25, generating friction. In order to reduce friction, a rigid post 26, especially a surface, may be added between the elastic means 25 and the plug body 5, in order to ensure a rigid contact with the plug body 5 and minimize the contact area. Specifically, the elastic means 25 is provided as 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 a rigid column 26, and the rigid column 26 is then abutted to the plug 5.

In a preferred embodiment, considering that the volume of the seal chamber is directly related to the discharge amount of the reciprocating pump, the elastic means 25 is not provided in the seal chamber, but a pressurizing means is connected to the suction pipe 21, by which an initial pressure is applied to the fluid to be driven in the suction pipe 21 in advance, and when the highest point of the boss 31 is separated from the plug body 5, the pressure in the seal chamber is reduced, and the fluid to be driven in the suction pipe 21 is pushed up to the inflow check valve 23 under the initial pressure and flows into the seal chamber. Meanwhile, the initial pressure further pushes the plug body 5 to generate a movement trend of leaving the sealing cavity, so that the plug body 5 is kept to be abutted against the protruding portion 31, the volume of the sealing cavity is enlarged or the pressure in the sealing cavity is reduced, and the friction force between the protruding portion 31 and the plug body 5 can be ensured.

Considering that the boss 31 is difficult to extend into the cylinder 20 due to its width when the plug body 5 is deep into the cylinder 20, in a more preferred embodiment, the end of the boss 31 is designed to be elongated so as to be conveniently deep into the cylinder 20 to remain in abutment with the plug body. In a preferred embodiment, considering the friction between the boss 31 and the plug body, the plug body is driven to roll away from the sealing cavity (the plug body 5 rotates clockwise in fig. 3), so that a rotatable animal, such as a driving wheel 35, can be further connected to the elongated end, and can be specifically rotatably fixed on the lower surface through a bracket 33, so as to realize that the boss 31 drives the plug body 5 to roll downwards. Specifically, as shown in the cross-sectional view of fig. 4, when the driving plate 30 moves to the right in the drawing, the support 33 drives the driving wheel 35 to move to the right, and at the same time, the driving wheel 35 abuts against the upper surface of the plug body 5, the driving wheel 35 rotates clockwise, the force of the driving wheel 35 to the plug body 5 points to the center of the circle in the radial direction of the plug body 5 and falls below the rotation point 27 where the plug body 5 interfaces with the front wall, so that the driving plug body 5 rotates counterclockwise, and the friction force of the driving wheel 35 to the plug body 5 also drives the plug body 5 to rotate counterclockwise, and the plug body 5 keeps close to the rotation point 27 on the front wall of the cylinder 20 under the action of the lateral component of the pressing force of the driving wheel 35. The plug body 5 will roll counter-clockwise around the rotation point 27 under the drive of the drive wheel 35 and move in the direction of the sealing chamber downwards in the figure until the position of the broken line in fig. 4 is reached. At this point the drive wheel 35 translates to and forces the highest point of the plug body 5 inwards (pointing in the direction of the sealing chamber) (the point of the plug body 5 furthest from the sealing chamber), the plug body 5 also reaches the lowest point, i.e. the position furthest into the sealing chamber, at which point the residual volume of the sealing chamber is minimal, and the fluid to be driven in the sealing chamber, under pressure, has mostly passed said outflow non-return valve 24 into the discharge pipe 22. The plug body 5 is driven by the return structure to keep close to the protruding part 31, and moves in a direction away from the sealing cavity, the sealing cavity expands in volume and reduces in pressure, the outflow check valve 24 is closed, the inflow check valve 23 is opened, new fluid to be driven flows into the sealing cavity, and the next stroke is started. The plug body 5 may be a ball plug 15 or a plunger 10, whether it is a ball plug 15 or a plunger 10, or other plug body that is axisymmetric and whose axis of symmetry spans the opening of the cylinder 20, as well as the operation thereof.

The reciprocating pump of the present invention is designed with various parameters as shown in fig. 4, and the plug body 5 in fig. 4 may represent an over-diameter section of the ball plunger 15 or a cross section of the plunger 10 perpendicular to the axial direction. For convenience of explanation, this section is described in terms of the up-down and left-right orientations in fig. 4, and it should be noted that this does not mean that in actual use, only the same orientations can be used. Here, the radius of the driving wheel 35 is taken asrThe radius of the plug body 5 isRThe force exerted by the driving wheel 35 on the plug body 5 is taken asN(assuming that the driving wheel 35 and the plug body 5 are both smooth, with no friction, after analysis in the presence of friction), and forceNThe turning force arm between the rotation point 27 is taken asd. In operation, the driving wheel 35 is driven by the driving plate 30 to move right along with the support 33, acting forceNDirected in a direction from the center of the driving wheel 35 to the center of the plug body 5NForm an included angle with the line from the rotation point 27 to the center of the plug body 5α. Obviously, the forceNTurning force arm between rotation point 27 anddis equal to the included angleαPositive correlation, specifically, satisfies the formula:

or (b)

Meanwhile, referring to fig. 4, there are:

according to

We have:

the method comprises the following steps:

or:

as can be seen in the formula, with the radius of the drive wheelrIncrease the translation distance of the plug body 5hThe amount of fluid to be driven that can be driven out of the outflow check valve 24 by such a compression stroke is reduced, and similarly, the amount of fluid to be driven that can be absorbed by an expansion stroke is also reduced, resulting in a reduction in the working efficiency.

Therefore, the diameter of the driving wheel 35 in the present invention needs to be specifically set according to the practical application requirements.

When the driving wheel 35 is provided, if the contact friction between the driving wheel 35 and the plug body 5 is considered, as shown in fig. 4, since the driving wheel 35 moves to the right, the driving wheel 35 will rotate clockwise, and the friction force drives the plug body 5 to rotate counterclockwise, i.e. the friction force between the driving wheel 35 and the plug body 5 is beneficial, as the plug body 5 is enhanced to rotate downward (in the direction of the bottom of the sealing cavity) around the rotation point 27.

The reciprocating pump of the present invention may be connected to each other, for example, by connecting the suction pipes 21 to each other and connecting the suction pipes to the inflow pipe 27, and connecting the discharge pipes 22 to each other and connecting the discharge pipes 28. At the same time, the driving plates 30 are also connected to form a whole body and synchronously move, so that a reciprocating pump cluster is formed, and the amount of fluid to be driven and the working reliability which can be driven at a time are increased. In particular, the reciprocating pump cluster may be a group of reciprocating pumps 50 arranged in a matrix form in a plane, or may be a group of reciprocating pumps 50 arranged in a cylinder as shown in fig. 5. In fig. 5, the suction pipe 21 of each reciprocating pump 50 is connected to the inflow pipe 27 closer to the middle of the cylinder, and the discharge pipe 22 of each reciprocating pump 50 is connected to the outflow pipe 28 closer to the middle of the cylinder. And is in turn connected to an external source of fluid to be driven via said inflow conduit 27 and said outflow conduit 28. The driving plates 30 are connected with each other to form a cylindrical surface of the cylinder, and rotate around the central line of the cylinder when in operation, and the protrusions 31 on the lower surface drive the plug body to rotate and translate, so that the aim of outputting the fluid to be driven after being pressurized is fulfilled.

In summary, the working method of the low-friction reciprocating pump of the invention is as follows:

A. the driving plate 30 moves transversely, and the protruding part 31 presses the plug body to roll along the inner wall surface of the cylinder 20 towards the sealing cavity;

B. the plug body compresses the fluid to be driven in the sealing cavity until the pressure in the sealing cavity is higher than the opening pressure of the outflow check valve 24; when the plug body starts to compress the fluid to be driven in the sealing cavity downwards, the pressure in the sealing cavity firstly closes the inflow one-way valve 23;

C. the outflow check valve 24 is forced open by the further increased pressure in the sealing chamber, and the fluid to be driven flows out of the discharge pipe 22;

D. the pressure in the sealed chamber decreases and the outflow check valve 24 closes;

E. the inflow check valve 23 is opened, and the fluid to be driven flows into the sealed cavity from the suction pipe 21; the pressure in the sealing cavity is partially compensated by the inflow fluid to be driven;

after one stroke is completed, the drive plate 30 is again moved laterally and the low friction reciprocating pump enters the next stroke.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention 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 (10)

1. A low friction reciprocating pump comprising:

a hollow cylinder body and a drive plate capable of transversely moving, wherein the lower surface of the drive plate is provided with a protruding part:

the cylinder body 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 abutted against the protruding part;

the sealed cavity is communicated with the suction pipe through the inflow one-way valve and is used for sucking fluid to be driven from the outside; the discharge pipe is communicated with the outflow check valve and is used for discharging the fluid to be driven;

when the driving plate transversely translates, the protruding part can press the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity;

a return structure is also included for urging the plug body to remain in abutment with the boss.

2. The reciprocating pump of claim 1, wherein the boss comprises an elongated end that abuts the plug body for driving the plug body in rolling and translating.

3. A reciprocating pump according to claim 1 or 2, wherein the plug body is cylindrical and the bore has a rectangular cross-section.

4. A reciprocating pump according to claim 1 or 2, wherein the plug body is a sphere and the bore is circular in open cross-section.

5. A reciprocating pump according to claim 1 or 2, wherein the return structure comprises a resilient means provided in the seal chamber for urging the plug body to move and abut the boss.

6. The reciprocating pump of claim 5, wherein said elastic means comprises an elastic body fixed to the inner wall of the cylinder, said elastic body abutting said plug body through a rigid post.

7. A reciprocating pump according to claim 1 or 2, wherein the return structure comprises a pressurizing means connected to the suction tube for applying an initial pressure to the fluid to be driven in the suction tube for driving the fluid to be driven from the inflow non-return valve into the sealing chamber and pushing the plug body against the boss.

8. A reciprocating pump cluster comprising at least two reciprocating pumps according to any of claims 1 to 7, characterized in that the suction pipes are in communication with each other and the discharge pipes are in communication with each other; the driving plates are connected into a whole and synchronously move.

9. The cluster of reciprocating pumps of claim 8 wherein said drive plates are interconnected as cylindrical surfaces, said lower surface being located inwardly of said cylindrical surfaces; the cylinder barrel is circumferentially arranged in the cylindrical surface, and each plug body is abutted against each protruding portion.

10. A method of operating a reciprocating pump according to any one of claims 1 to 7, comprising the steps of:

A. the driving plate transversely moves, and the protruding part presses the plug body to roll along the inner wall surface of the cylinder barrel towards the sealing cavity;

B. the plug body compresses the fluid to be driven in the sealing cavity until the pressure in the cavity to be sealed is higher than the opening pressure of the outflow check valve;

C. the outflow check valve is opened, and the fluid to be driven flows out of the discharge pipe;

D. the pressure in the sealing cavity is reduced, and the outflow check valve is closed;

E. the inflow check valve is opened, and fluid to be driven flows into the sealing cavity from the suction pipe.