Fluid driving mechanism for positive displacement pump, positive displacement pump, and working method for positive displacement pump

Abstract

Provided are a fluid driving mechanism for a positive displacement pump, a positive displacement pump, and a working method for a positive displacement pump. The fluid driving mechanism comprises: a static disc (1), which is provided with a receiving cavity formed therein, and a guide portion (2) provided on a side wall of the receiving cavity; and a movable disc (3), which is arranged in the static disc (1) in a swinging manner, wherein a first outer cavity (5) and a second outer cavity (6) are formed between the movable disc (3) and the static disc (1), a moving portion (4) is arranged on the movable disc (3), the moving portion (4) is movably engaged with the guide portion (2), and a first inner cavity (7) and a second inner cavity (8) are formed between the moving portion (4) and an engagement portion, thereby prolonging the service life of the fluid driving mechanism.

Description

Fluid driving mechanism for positive displacement pump, positive displacement pump and working method of positive displacement pump Technical Field

[0001] The present invention relates to the technical field of fluid transport devices, and in particular to a fluid driving mechanism for a positive displacement pump, the positive displacement pump, and a working method of the positive displacement pump. Background Art

[0002] A positive displacement pump uses reciprocating or rotary motion of its pistons, plungers, diaphragms, gears, or vanes within the pump body, causing the volume of several working chambers within the pump body to change periodically, thereby alternately drawing in and out liquid. These pumps feature high efficiency, strong self-priming capabilities, and some pumps can be preheated.

[0003] Although the existing piston-type positive displacement pump can realize fluid transportation, due to the consideration of the sealing effect when the piston moves, the piston ring wear linear speed is too high, resulting in increased wear. In addition, the rotation speed is too high and the vibration is too large, resulting in the operating speed of the traditional positive displacement pump not exceeding 3000r / min, and the piston ring needs to be replaced after working for a period of time. Moreover, the characteristics of the piston movement will cause the entire positive displacement pump to bear a large load along the axial direction of the piston. Therefore, a relatively complex and expensive support structure needs to be set on the positive displacement pump along the axial direction of the piston. Technical issues

[0004] The technical problem to be solved by the present invention is to provide a fluid driving mechanism for a positive displacement pump, a positive displacement pump and a working method of the positive displacement pump in response to the current status of the existing technology. Technical Solutions

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: a fluid drive mechanism for a positive displacement pump is proposed, comprising: a stator plate having a cavity formed therein and a guide portion provided on a side wall of the cavity, wherein the guide portion is integrally formed with the stator plate or provided separately;

[0006] A movable disk is swingably arranged in the containing cavity and divides the containing cavity into a first outer cavity and a second outer cavity that are movably connected. A movable part is provided on the movable disk. The movable part is movably engaged with the guide part and forms a first inner cavity and a second inner cavity between the movable part and the engaging part. The first outer cavity and the first inner cavity are movably connected, and a feed cavity is formed when the first outer cavity and the first inner cavity are connected. The second outer cavity and the second inner cavity are movably connected, and a discharge cavity is formed when the second inner cavity and the second outer cavity are connected.

[0007] In the above-mentioned fluid drive mechanism for a positive displacement pump, the guide portion is T-shaped, the moving portion is a trapezoidal groove, and a gap is provided between the trapezoidal groove and the guide portion to form the first inner cavity and the second inner cavity.

[0008] In the above-mentioned fluid drive mechanism for a positive displacement pump, the contour lines on both sides of the guide portion are circular arc curves, cycloids or involutes.

[0009] In the above-mentioned fluid driving mechanism for a positive displacement pump, the contour lines on both sides of the guide portion are any two combinations of involutes, cycloids, and involutes, or a combination of involutes, cycloids, and involutes.

[0010] In the above-mentioned fluid driving mechanism for a positive displacement pump, the number of the guide parts and the number of the moving parts are two or more.

[0011] The fluid drive mechanism for the positive displacement pump further includes:

[0012] a housing having a sealed chamber therein, the static plate and the dynamic plate both being disposed within the housing, the housing being provided with an inlet and an outlet located on both sides of the guide portion and both communicating with the chamber, the movable portion having a first blocking portion and a second blocking portion movably abutting against the inlet and the outlet, respectively;

[0013] A driving assembly is arranged in the housing and is used to drive the movable plate to swing in the chamber.

[0014] In the above-mentioned fluid drive mechanism for a positive displacement pump, the drive assembly includes:

[0015] a driving member disposed in the housing;

[0016] a rotating shaft, which is arranged at the output end of the driving member, and the driving member is used to drive the rotating shaft to rotate along the axis direction of the rotating shaft;

[0017] a driving rod, which is arranged on the upper part of the rotating shaft and is integrally formed with the rotating shaft or separately provided, the axial direction of the driving rod is arranged parallel to the axial direction of the rotating shaft and is not collinear, and the moving disc is sleeved on the outside of the driving rod;

[0018] a counterweight block, which is arranged at the end of the rotating shaft;

[0019] Several bearings are provided between the driving rod and the moving plate, and between the rotating shaft and the housing.

[0020] The present invention solves the above technical problems and further provides a positive displacement pump, comprising the above-mentioned fluid driving mechanism for a positive displacement pump.

[0021] The present invention solves the above technical problems and further provides a working method, which includes the above-mentioned volumetric pump. Beneficial effects

[0022] Compared with the prior art, the advantage of the present invention is that by swinging the moving disc along its own radial direction, its axial load is basically zero, and during the suction and compression process of the fluid, there is at most intermittent friction between the moving disc and the static disc. Even when the dimensional accuracy of the moving disc and the static disc is such that the gap is sealed, there will not even be friction between the moving disc and the static disc 1, thereby making the rotation speed of the moving disc exceed the limit of 3000r / min in the prior art and improving the service life of the fluid drive mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a perspective view of the fluid drive mechanism of the present invention;

[0024] FIG2 is a schematic diagram of the working state of the present invention when the first outer cavity and the second outer cavity are isolated and the first inner cavity and the second inner cavity are connected;

[0025] FIG3 is a schematic diagram of the working state of the present invention when the first outer cavity is enlarged and the second outer cavity is reduced and the first inner cavity is reduced and the second inner cavity is enlarged;

[0026] FIG4 is a perspective view of the working state of the present invention when the first outer cavity and the second outer cavity are connected and the first inner cavity and the second inner cavity are isolated from each other;

[0027] FIG5 is a schematic diagram of the working state of the present invention in which the first outer cavity is reduced and the second outer cavity is increased, and the first inner cavity is increased and the second cavity is reduced;

[0028] FIG6 is a perspective view of the fluid drive mechanism of the present invention having two moving parts and two guide parts;

[0029] FIG7 is a perspective view of the three-dimensional driving mechanism of the present invention having three moving parts and a guide part;

[0030] FIG8 is a perspective view of the displacement pump of the present invention;

[0031] FIG9 is a plan view of FIG8;

[0032] FIG10 is a cross-sectional view taken along line AA in FIG9 ;

[0033] FIG11 is a perspective view of part of the structure in FIG9 .

[0034] In the figure, 1. static plate; 2. guide part; 3. dynamic plate; 4. moving part; 5. first outer cavity; 6. second outer cavity; 7. first inner cavity; 8. second inner cavity; 9. shell; 10. inlet; 11. outlet; 12. first blocking part; 13. second blocking part; 14. driving member; 15. rotating shaft; 16. driving rod; 17. bearing; 18. feed cavity; 19. discharge cavity. Modes for Carrying Out the Invention

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0036] In this solution, the working conditions of the driving mechanism when applied to a positive displacement pump and the specific structure of the driving mechanism are mainly described in detail. However, the driving mechanism of this solution is not limited to use in positive displacement pumps, but can also be used in equipment for transporting fluids, such as air compressors.

[0037] The present invention provides a fluid drive mechanism for a positive displacement pump, comprising: a static plate 1 having a cavity formed therein and a guide portion 2 arranged on a side wall of the cavity, the guide portion 2 being integrally formed with the static plate 1 or separately arranged; a dynamic plate 3 being swingably arranged in the cavity and dividing the cavity into a first outer cavity 5 and a second outer cavity 6 that are movably connected, the dynamic plate 3 being provided with a moving portion 4, the moving portion 4 being movably engaged with the guide portion 2 and forming a first inner cavity 7 and a second inner cavity 8 that are movably connected between the moving portion 4 and the engaging portion, the first outer cavity 5 and the first inner cavity 7 being movably connected, and forming a feed cavity 18 when the first outer cavity 5 and the first inner cavity 7 are connected, the second outer cavity 6 and the second inner cavity 8 being movably connected, and forming a discharge cavity 19 when the second inner cavity 8 and the second outer cavity 6 are connected.

[0038] Based on the above embodiments, an exemplary structure of the present scheme is shown in Figures 1 to 5, wherein the moving disk 3 is disc-shaped and the static disk 1 is a ring-shaped structure. In the present scheme, the guide portion 2 and the static disk 1 are integrally formed. Of course, the guide portion 2 can also be fixed to the static disk 1 by welding, gluing or threaded connection. The guide portion 2 protrudes from the inner side wall of the static disk 1 and the moving portion 4 is a recessed structure. Of course, the guide portion 2 can also be a recessed structure and the moving portion 4 is correspondingly made into a convex structure. During operation, the moving disk 3 swings in the cavity to drive the moving portion 4 to move along the outer contour line of the guide portion 2.

[0039] Specifically, the state shown in FIG2 is the initial state (FIG. 3, FIG4, and FIG5 may also be the initial state). In this state, the lower portion of the movable disk 3 shown in the figure abuts against the inner wall of the static disk 1, isolating the first outer cavity 5 and the second outer cavity 6. The movable portion 4 abuts against the middle position of the guide portion 2 shown in the figure, the first inner cavity 7 is reset to zero, and the second inner cavity 8 is at the maximum opening position. At this time, the movable disk 3 can be switched from FIG2 to FIG5, that is, the left end of the movable portion 4 moves along the outer contour of the left side of the guide portion 2, or it can be switched from FIG2 to FIG3, that is, the right end of the movable portion 4 moves along the outer contour of the right side of the guide portion 2. For ease of understanding, the explanation is given here in the order of the numbers of the accompanying drawings, that is, the movement path of the movable disk 3 is from FIG2 to FIG3, FIG4, FIG5, and then back to FIG2 in a cycle.

[0040] During operation, the movable disk 3 swings toward the upper left position of Figure 2, driving the right end of the movable part 4 to move from bottom to top along the outer contour of the right side of the guide part 2. In this process, the first outer cavity 5 and the first inner cavity 7 gradually increase, while the second outer cavity 6 and the second outer cavity 6 gradually decrease, and the discharge cavity 19 gradually appears. The gradual increase of the first outer cavity 5 and the first inner cavity 7 can reduce the internal pressure of the first outer cavity 5 and the first inner cavity 7, so that the first outer cavity 5 and the first inner cavity 7 have the ability to absorb fluid, while the second outer cavity 6 and the second inner cavity 8 gradually decrease, so that the second outer cavity 6 and the second inner cavity 8 have the ability to compress and discharge fluid.

[0041] When the movable disk 3 swings to the state shown in Figure 3, the first outer cavity 5 completes the suction of the fluid, the right end of the movable part 4 isolates the first inner cavity 7 and the first outer cavity 5, the second outer cavity 6 and the second inner cavity 8 complete the compression of the fluid and converge at one point and the discharge cavity appears. At this time, the first outer cavity 5 basically occupies the space outside and inside the movable disk 3, so that the fluid in the first outer cavity 5 can flow into the second outer cavity 6.

[0042] When the movable disk 3 swings to the position shown in Figure 4, the upper part of the movable disk 3 rests on the side wall of the static disk 1, so that the first outer cavity 5 returns to zero and the second outer cavity 6 is in the maximum expansion position, and the feed cavity 18 and the discharge cavity appear at the same time. In this process, the first inner cavity 7 gradually increases again so that it has the ability to absorb fluid, and both ends of the movable part 4 move to the extreme position, and the swing direction of the movable disk 3 begins to change. The movable disk 3 begins to swing along the lower right side of Figure 4 to the state shown in Figure 5, so that the left end of the movable part 4 moves from top to bottom along the left outer contour of the guide part 2. In this process, the first outer cavity 5 and the first inner cavity 7 also gradually increase, and the internal pressure decreases again to prepare for the next fluid absorption operation. The discharge cavity gradually decreases so that it can compress the fluid therein. After that, the movable disk 3 continues to move to the state shown in Figure 2 and performs the next cycle operation.

[0043] Compared with the prior art, the swinging direction of the moving disc 3 in the fluid drive mechanism in this scheme is always circular, the direction of the force generated by the movement of the moving disc 3 is always perpendicular to the tangent direction of the movement trajectory of the moving disc 3, and its axial load is basically zero. In addition, during the suction and compression process of the fluid, an oil film seal can be formed between the moving disc 3 and the static disc 1, and no friction will occur between the moving disc 3 and the static disc 1, thereby making the rotation speed of the moving disc 3 exceed the limit of 3000r / min in the prior art and improving the service life of the fluid drive mechanism.

[0044] Furthermore, the guide portion 2 is T-shaped, the movable portion 4 is a trapezoidal groove, and a gap is provided between the trapezoidal groove and the guide portion 2 to form a first inner cavity 7 and a second inner cavity 8 .

[0045] Furthermore, the outer contours on both sides of the guide portion 2 may be arc curves as shown in the figure, or the contour lines on both sides of the guide portion 2 may be set to cycloids or involutes.

[0046] Of course, the outer contours of both sides of the guide portion 2 may also be a combination of two circular arc curves, cycloids, and involutes, or a combination of the three.

[0047] Furthermore, the number of the guide parts 2 and the moving parts 4 is two or more.

[0048] The greater the number of guide parts 2 and moving parts 4 , the higher the efficiency of the fluid driving mechanism in transporting the fluid.

[0049] Furthermore, the present solution also includes: a shell 9, in which a sealed chamber is provided, the static disk 1 and the movable disk 3 are both arranged in the shell 9, the shell 9 is provided with an inlet 10 and an outlet 11 on both sides of the guide part 2 and connected to the chamber, the movable part 4 has a first blocking part 12 and a second blocking part 13 that are movably abutted against the inlet 10 and the outlet 11 respectively; a driving assembly, which is arranged in the shell 9 and is used to drive the movable disk 3 to swing in the chamber.

[0050] The inlet 10 is used for allowing fluid to enter the chamber for compression, and the outlet 11 is used for discharging the compressed fluid. The driving assembly is used to drive the movable plate 3 to swing relative to the static plate 1. The first blocking portion 12 and the second blocking portion 13 can be symmetrically arranged or asymmetrically arranged.

[0051] Specifically, the drive assembly includes: a drive member 14, which is arranged in the shell 9; a rotating shaft 15, which is arranged at the output end of the drive member 14, and the drive member 14 is used to drive the rotating shaft 15 to rotate along the axial direction of the rotating shaft 15; a drive rod 16, which is integrally formed with the rotating shaft 15 or separately arranged, the axial direction of the drive rod 16 is parallel to the axial direction of the rotating shaft 15 and is not colinear, and the movable disk 3 is sleeved on the outside of the drive rod 16; a counterweight block, which is arranged at one end of the drive rod 16 away from the rotating shaft 15; a plurality of bearings 17, and a plurality of bearings 17 are arranged between the drive rod 16 and the movable disk 3, and between the rotating shaft 15 and the shell 9.

[0052] The driving member 14 is preferably a motor. When working, the motor drives the rotating shaft 15 to rotate, thereby driving the driving rod 16 to rotate eccentrically relative to the rotating shaft 15 in the shell 9. When the rotating shaft 15 rotates, it drives the moving disk 3 to swing back and forth relative to the static disk 1. The bearing 17 is fixed in the shell 9 in a rotating manner and reduces the friction between the driving rod 16 and the moving disk 3. The counterweight block is used to ensure that the dynamic balance of the entire mechanism meets the design requirements during operation. The number of the counterweight block can be one, two or more, and the counterweight block can be inside the chamber or outside the chamber.

[0053] The present invention also includes a method for operating a positive displacement pump, comprising the steps of:

[0054] S1, the first blocking block and the second blocking block abut against both sides of the guide portion 2, and the outlet 11 is closed, the first inner cavity 7 returns to zero, the first outer cavity 5 is connected to the inlet 10 and is in the feeding process, and the second outer cavity 6 is isolated from the discharge cavity 19 and is in the compression process;

[0055] S2, the first blocking block isolates the feed port and the first outer chamber 5, the first outer chamber 5 completes the material absorption, and the outlet 11 opens, the second inner chamber 8 and the second outer chamber 6 are connected to form the discharge chamber 19, and the first inner chamber 7 is connected to the feed port and is in the material absorption process;

[0056] S3 The inlet 10 and the outlet 11 are opened at the same time, the feed cavity 18 and the discharge cavity 19 appear at the same time, and the discharge cavity 19 is connected with the outlet 11 in the discharge process, the feed cavity 18 is connected with the inlet 10 in the feeding process, the first outer cavity 5 is connected with the second outer cavity 6, and the fluid absorbed by the first outer cavity 5 is discharged into the second outer cavity 6;

[0057] S4, the second blocking block separates the discharge cavity 19, the second outer cavity 6 appears and performs the compression process, the second inner cavity 8 is in the discharge process, and the feed cavity 18 continues the feeding process;

[0058] S6. Repeat the above steps.

[0059] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0060] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0061] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0062] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them with similar methods without departing from the scope defined by the spirit of the present invention.

Claims

1. A fluid drive mechanism for a positive displacement pump, characterized in that: include: A static plate, the static plate having a cavity formed therein and a guide portion arranged on a side wall of the cavity, the guide portion being integrally formed with the static plate or being separately arranged; A movable plate is swingably arranged in the containing cavity and divides the containing cavity into a first outer cavity and a second outer cavity that are movably connected. A moving part is arranged on the movable plate. The moving part is movably engaged with the guide part and a first inner cavity and a second inner cavity are formed between the moving part and the engaging part. The first outer cavity and the first inner cavity are movably connected, and a feed cavity is formed when the first outer cavity and the first inner cavity are connected. The second outer cavity and the second inner cavity are movably connected, and a discharge cavity is formed when the second inner cavity and the second outer cavity are connected.

2. A fluid drive mechanism for a positive displacement pump as claimed in claim 1, characterized in that: The guide portion is T-shaped, the moving portion is a trapezoidal groove, and a gap is provided between the trapezoidal groove and the guide portion to form the first inner cavity and the second inner cavity.

3. A fluid drive mechanism for a positive displacement pump as claimed in claim 1, characterized in that: The contour lines on both sides of the guide portion are arc curves, cycloids or involutes.

4. A fluid drive mechanism for a positive displacement pump as claimed in claim 1, characterized in that: The contour lines on both sides of the guide portion are any two combinations of involutes, cycloids and involutes, or a combination of involutes, cycloids and involutes.

5. A fluid drive mechanism for a positive displacement pump as claimed in claim 1, characterized in that: The number of the guide parts and the number of the moving parts are both two or more.

6. A fluid drive mechanism for a positive displacement pump as claimed in claim 1, characterized in that: Also includes: A housing having a sealed chamber therein, the static plate and the dynamic plate both being disposed in the housing, the housing having an inlet and an outlet located on both sides of the guide portion and both being connected to the chamber, the movable portion having a first blocking portion and a second blocking portion respectively movably abutting against the inlet and the outlet; A driving assembly is arranged in the housing and is used to drive the moving plate to swing in the chamber.

7. A fluid drive mechanism for a positive displacement pump as claimed in claim 6, characterized in that: The drive assembly comprises: A driving member, which is disposed in the housing; A rotating shaft, which is arranged at the output end of the driving member, and the driving member is used to drive the rotating shaft to rotate along the axis direction of the rotating shaft; A driving rod is arranged on the upper part of the rotating shaft and is integrally formed with the rotating shaft or separately arranged, the axial direction of the driving rod is arranged parallel to the axial direction of the rotating shaft and is not colinear, and the moving plate is sleeved on the outer side of the driving rod; A counterweight block, which is arranged at the end of the rotating shaft; A plurality of bearings are arranged between the driving rod and the moving plate, and between the rotating shaft and the housing.

8. A positive displacement pump, characterized in that: Comprising a fluid drive mechanism for a positive displacement pump as described in claim 6.

9. A working method, characterized in that: A positive displacement pump as claimed in claim 8, comprising the steps of: S1, the first blocking block and the second blocking block abut against both sides of the guide part, and the outlet is closed, the first inner cavity returns to zero, the first outer cavity is connected to the inlet and is in the feeding process, and the second outer cavity is isolated from the discharge cavity and is in the compression process; S2, the first blocking block isolates the feed port and the first outer cavity, the first outer cavity completes the material absorption, the outlet is opened, the second inner cavity and the second outer cavity are connected to form a discharge cavity, the first inner cavity and the feed port are connected and are in the material absorption process; S3, the inlet and the outlet are opened at the same time, the feed cavity and the discharge cavity appear at the same time, and the discharge cavity is connected with the outlet in the discharge process, the feed cavity is connected with the inlet in the feed process, the first outer cavity is connected with the second outer cavity, and the fluid absorbed by the first outer cavity is discharged into the second outer cavity; S4, the second blocking block separates the discharge cavity, the second outer cavity appears and performs the compression process, the second inner cavity is in the discharge process, and the feed cavity continues the feeding process; S6, repeat the above steps repeatedly.

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