Working method of positive displacement pump

Abstract

The invention relates to the technical field of fluid conveying devices, and provides a working method of a positive displacement pump, which comprises the following steps: S1, a first blocking part and a second blocking part respectively abut against two sides of a guide part, an outlet is closed, and a first inner cavity returns to zero; s2, the first blocking part isolates the inlet and the first outer cavity, and after the first outer cavity sucks materials, the outlet is opened; s3, an inlet and an outlet are opened at the same time, and a feeding cavity and a discharging cavity appear at the same time; s4, a second blocking part divides a discharging cavity, a second outer cavity appears and carries out the compression process, and a second inner cavity is in the discharging process; and S5, the steps from S1 to S4 are circulated and repeated. Compared with the prior art, the working method of the displacement pump is achieved based on a fluid driving mechanism of a parent case, the movable disc swings in the radial direction of the movable disc, the axial load of the movable disc is basically zero, and a complex axial supporting structure does not need to be arranged.

Description

[0001] This application is a divisional application of the parent application CN202311304565.4, which is entitled "Fluid Drive Mechanism for Positive Displacement Pump, Positive Displacement Pump and Working Method of Positive Displacement Pump". The application date is October 10, 2023, and the application number is 202311304565.4. Technical Field

[0002] This invention relates to the field of fluid transport device technology, and more specifically to a method for operating a positive displacement pump. Background Technology

[0003] A positive displacement pump is a type of pump that relies on the reciprocating or rotary motion of working components such as pistons, plungers, diaphragms, gears, or blades within the pump body to periodically change the volume of several working chambers within the pump body, thereby alternately drawing in and discharging liquid. It features high efficiency, strong self-priming capability, and the ability for some pumps to be preheated.

[0004] While existing piston-type positive displacement pumps can transport fluids, the piston rings wear at excessively high linear speeds due to sealing considerations during piston movement, leading to accelerated wear. Additionally, the high rotational speed and excessive vibration limit the operating speed of traditional positive displacement pumps to no more than 3000 r / min. Furthermore, the piston rings need to be replaced after a period of operation. Moreover, the characteristics of piston movement cause the entire positive displacement pump to bear a large load along the piston axis, requiring a complex and costly support structure along the piston axis.

[0005] To address the aforementioned issues, the parent application proposes a novel fluid drive mechanism for a positive displacement pump, and the corresponding positive displacement pump operating method enables radial oscillation of the moving disc for fluid transport, overcoming the shortcomings of traditional piston-type positive displacement pumps. This application, as a divisional application, specifically defines and protects the operating method of this positive displacement pump. Summary of the Invention

[0006] The purpose of this invention is to provide a method for operating a positive displacement pump, which achieves efficient fluid delivery based on a fluid drive mechanism, reduces the axial load on the positive displacement pump, reduces component friction, and increases the pump's rotational speed and service life.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A method for operating a volumetric pump is proposed. The volumetric pump includes a fluid drive mechanism, which includes a stationary disc, a moving disc, a housing, and a drive assembly. The stationary disc has a cavity and a guide portion disposed on the side wall of the cavity. The moving disc is oscillatingly disposed within the cavity and divides the cavity into a first outer cavity and a second outer cavity that are movably connected. A movable portion is provided on the moving disc, which is movably engaged with the guide portion to form a first inner cavity and a second inner cavity. The movable portion has a first blocking portion and a second blocking portion. The housing has an inlet and an outlet that communicate with the cavity. The operating method includes the following steps: S1, the first blocking part and the second blocking part abut against the two sides of the guide part respectively, and the outlet is closed. The first inner cavity is zeroed out, 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 part isolates the inlet and the first outer cavity. After the first outer cavity finishes feeding material, the outlet opens. The second inner cavity and the second outer cavity are connected to form the discharge cavity. The first inner cavity is connected to the inlet and is in the process of feeding material. S3. The inlet and outlet are opened simultaneously, the feed chamber and the discharge chamber appear at the same time, and the discharge chamber is connected to the outlet in the discharge process, the feed chamber is connected to the inlet in the feed process, the first outer chamber and the second outer chamber are connected, and the fluid absorbed by the first outer chamber is discharged into the second outer chamber. S4. The second blocking part separates the material chamber, the second outer chamber appears and undergoes a compression process, the second inner chamber is in the discharge process, and the feeding chamber continues to perform the feeding process. S5. Repeat steps S1-S4.

[0008] In the above-described method for operating a volumetric pump, the guide portion is T-shaped, the moving portion is a trapezoidal groove, and there is a gap between the trapezoidal groove and the guide portion forming the first inner cavity and the second inner cavity. In steps S1-S4, the moving portion swings along the outer contour line of the guide portion.

[0009] In the above-mentioned method of operating a volumetric pump, the contour lines on both sides of the guide section are one or more combinations of arc curves, cycloids, and involutes. In steps S1-S4, the moving part oscillates along the contour lines of the guide section.

[0010] In the above-described method of operating a positive displacement pump, the number of the guide section and the moving section are both two or more, and each moving section swings synchronously along the corresponding guide section and performs the feeding, compression, and discharging steps S1-S4.

[0011] In the above-mentioned method for operating a volumetric pump, the drive assembly includes a drive component, a rotating shaft, and a drive rod. The drive component drives the rotating shaft to rotate, the rotating shaft drives the drive rod to rotate eccentrically, and the drive rod drives the moving disc to oscillate within the cavity, thereby realizing the reciprocating oscillation action of the moving disc in steps S1-S4.

[0012] In the above-mentioned method of operating a volumetric pump, bearings are provided between the drive rod and the moving disc, and between the rotating shaft and the housing. The moving disc swings around the drive rod through the bearings, thereby reducing friction during the swinging process.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The working method of the volumetric pump of the present invention is based on the fluid drive mechanism of the parent design. The moving plate swings along its own radial direction, so that its axial load is basically zero, and there is no need to set up a complex axial support structure. During the process of fluid suction and compression, there is at most intermittent friction between the moving plate and the stationary plate. Even if the dimensional accuracy of the moving plate and the stationary plate is achieved with gap sealing, there will be no friction between them. This allows the rotational speed of the moving plate to exceed the limit of 3000 r / min in the prior art, and significantly improves the service life of the fluid drive mechanism.

[0014] Meanwhile, through the cooperation of the first and second blocking parts and the guide part, as well as the periodic changes in the volume of the first outer cavity, the second outer cavity, the first inner cavity, and the second inner cavity, continuous circulation of feeding, compression, and discharge is achieved, making the fluid transport process stable and efficient, and adaptable to various fluid transport equipment such as air compressors. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the fluid drive mechanism in this sub-case.

[0016] Figure 2 This is a schematic diagram showing the first and second outer cavities isolated and the first and second inner cavities connected when the scheme is in operation.

[0017] Figure 3 This is a schematic diagram showing the first outer cavity increasing and the second outer cavity decreasing, while the first inner cavity decreases and the second inner cavity increases, under the working conditions of this scheme.

[0018] Figure 4 This is a three-dimensional view of the first outer cavity and the second outer cavity when the first inner cavity and the second inner cavity are isolated from each other in the working state of this scheme.

[0019] Figure 5 This is a schematic diagram showing the first outer cavity decreasing and the second outer cavity increasing while the first inner cavity increases and the second inner cavity decreases during the working state of this scheme.

[0020] Figure 6This is a perspective view of the fluid drive mechanism of this scheme when it has two moving parts and two guiding parts.

[0021] Figure 7 This is a perspective view of the three-dimensional drive mechanism of this scheme when it has three moving parts and a guide part.

[0022] Figure 8 This is a 3D view of the positive displacement pump in this design.

[0023] Figure 9 yes Figure 8 The floor plan.

[0024] Figure 10 yes Figure 9 Sectional view along the AA direction.

[0025] Figure 11 yes Figure 9 A three-dimensional view of the middle part of the structure.

[0026] In the figure, 1 is the stationary disc; 2 is the guide part; 3 is the moving disc; 4 is the moving part; 5 is the first outer cavity; 6 is the second outer cavity; 7 is the first inner cavity; 8 is the second inner cavity; 9 is the shell; 10 is the inlet; 11 is the outlet; 12 is the first blocking part; 13 is the second blocking part; 14 is the driving component; 15 is the rotating shaft; 16 is the driving rod; 17 is the bearing; 18 is the feeding chamber; and 19 is the discharging chamber. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] 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 positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] This solution mainly focuses on the working condition of the drive mechanism in a positive displacement pump and details the specific structure of the drive mechanism. However, the drive mechanism of this solution is not limited to positive displacement pumps, but can also be used in equipment that transports fluids, such as air compressors.

[0031] This solution provides a fluid drive mechanism for a positive displacement pump, comprising: a stationary disc 1 having a cavity formed therein and a guide portion 2 disposed on the side wall of the cavity, the guide portion 2 being integrally formed with the stationary disc 1 or separately disposed; a movable disc 3, which is oscillatingly disposed within the cavity and dividing the cavity into a first outer cavity 5 and a second outer cavity 6 that are movably connected, the movable disc 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 guide portion 2, the first outer cavity 5 and the first inner cavity 7 being movably connected, and when the first outer cavity 5 and the first inner cavity 7 are connected, a feed cavity 18 is formed, the second outer cavity 6 and the second inner cavity 8 are movably connected, and when the second inner cavity 8 and the second outer cavity 6 are connected, a discharge cavity 19 is formed.

[0032] Based on the above embodiments, an exemplary structure of this solution is as follows: Figures 1 to 5 As shown, the moving disk 3 is disc-shaped, and the stationary disk 1 is ring-shaped. In this design, the guide part 2 and the stationary disk 1 are integrally formed. Of course, the guide part 2 can also be fixed to the stationary disk 1 by welding, gluing or threaded connection. The guide part 2 protrudes from the inner sidewall of the stationary disk 1, and the moving part 4 is a recessed structure. Of course, the guide part 2 can also be a recessed structure, while the moving part 4 is correspondingly made into a convex structure. During operation, the moving disk 3 swings in the cavity, driving the moving part 4 to move along the outer contour line of the guide part 2.

[0033] Specifically, with Figure 2 The state shown is the initial state. Figure 3 , Figure 4 , Figure 5 (Also the initial state). In this state, the lower part of the moving disk 3 (shown in the diagram) abuts against the inner wall of the stationary disk 1, isolating the first outer cavity 5 and the second outer cavity 6. The moving part 4 abuts against the middle position of the guide part 2 (shown in the diagram). The first inner cavity 7 returns to zero, and the second inner cavity 8 is in the maximum opening position. At this time, the moving disk 3 can move from... Figure 2 Switch to Figure 5 That is, the left end of the moving part 4 moves along the outer contour of the left side of the guide part 2, and can also be from Figure 2 Switch to Figure 3 That is, the right end of the moving part 4 moves along the outer contour of the right side of the guide part 2. For ease of understanding, the explanation here follows the numbering order of the attached drawings, that is, the movement path of the moving disk 3 is from... Figure 2 sequentially to Figure 3 , Figure 4 , Figure 5 Back to Figure 2 The state cycle repeats itself continuously.

[0034] When working, the moving plate 3 is facing... Figure 2The upper left position swings, causing the right end of the moving part 4 to move from bottom to top along the outer contour of the right side of the guide part 2. During this process, the first outer cavity 5 and the first inner cavity 7 gradually increase in size, while the second outer cavity 6 and the second inner cavity 8 gradually decrease in size, and the discharge cavity 19 gradually forms. The gradual increase in size of the first outer cavity 5 and the first inner cavity 7 can reduce the pressure inside the first outer cavity 5 and the first inner cavity 7, enabling the first outer cavity 5 and the first inner cavity 7 to have the ability to suck in fluid. The gradual decrease in size of the second outer cavity 6 and the second inner cavity 8 enables the second outer cavity 6 and the second inner cavity 8 to have the ability to compress and discharge fluid.

[0035] When the moving plate 3 swings to Figure 3 In the state shown, the first outer cavity 5 completes the intake of fluid, the right end of the moving 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 fluid and converge at a point, and the discharge cavity 19 is formed. At this time, the fluid in the first outer cavity 5 can flow into the second outer cavity 6.

[0036] When the moving plate 3 swings to Figure 4 At the indicated position, the upper part of the moving disk 3 abuts against the side wall of the stationary disk 1, causing the first outer cavity 5 to return to zero while the second outer cavity 6 is in its maximum expanded position. Simultaneously, the feed cavity 18 and the discharge cavity 19 appear. During this process, the first inner cavity 7 gradually enlarges again to enable it to draw in fluid, and both ends of the moving part 4 move to their extreme positions. The swing direction of the moving disk 3 begins to change, and the moving disk 3 begins to move along... Figure 4 Swing to the lower right Figure 5 As shown, the left end of the moving part 4 moves downwards along the left outer contour of the guide part 2. During this process, the first outer cavity 5 and the first inner cavity 7 gradually increase in size, and their internal pressure decreases again, preparing for the next fluid intake. The discharge cavity 19 gradually decreases in size, enabling it to compress the fluid within the cavity. After this, the moving disc 3 continues to move to... Figure 2 The state shown will be entered, and the next loop operation will be performed.

[0037] Compared with the prior art, the swing trajectory of the moving disk 3 in the fluid drive mechanism of this solution is always circular, and the direction of the force generated by the movement of the moving disk 3 is always perpendicular to the tangent of the movement trajectory of the moving disk 3. Its axial load is basically zero. Furthermore, during the suction and compression of the fluid, an oil film seal can be used between the moving disk 3 and the stationary disk 1, and there will be no friction between the moving disk 3 and the stationary disk 1. This allows the rotational speed of the moving disk 3 to break through the limit of 3000 r / min in the prior art and improve the service life of the fluid drive mechanism.

[0038] Furthermore, the guide part 2 is T-shaped, the moving part 4 is a trapezoidal groove, and there is a gap between the trapezoidal groove and the guide part 2 to form the first inner cavity 7 and the second inner cavity 8.

[0039] Furthermore, the outer contours on both sides of the guide portion 2 can be the arc curves shown in the figure, or the contour lines on both sides of the guide portion 2 can be set as cycloids or involutes.

[0040] Of course, the outer contours on both sides of the guide section 2 can also be any combination of two or three of the following: circular arc, cycloid, and involute.

[0041] Furthermore, the number of guide parts 2 and moving parts 4 are both two or more.

[0042] The more guide parts 2 and moving parts 4 there are, the higher the efficiency of the fluid drive mechanism in conveying fluid.

[0043] Furthermore, this solution also includes: a housing 9, which has a sealed chamber inside, both the stationary disk 1 and the moving disk 3 are disposed inside the housing 9, the housing 9 is provided with an inlet 10 and an outlet 11 located on both sides of the guide part 2 and communicating with the chamber, the moving part 4 has a first blocking part 12 and a second blocking part 13 that move against the inlet 10 and the outlet 11 respectively; and a drive assembly, which is disposed inside the housing 9 and is used to drive the moving disk 3 to swing within the chamber.

[0044] Inlet 10 is used to allow fluid to enter the chamber for compression, outlet 11 is used to discharge the compressed fluid, drive assembly is used to drive moving disk 3 to swing relative to stationary disk 1, first blocking part 12 and second blocking part 13 can be arranged symmetrically or asymmetrically.

[0045] Specifically, the drive assembly includes: a drive member 14, which is disposed within the housing 9; a rotating shaft 15, which is disposed 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 its own axis; a drive rod 16, which is integrally formed with the rotating shaft 15 or separately disposed therefrom, the axis of the drive rod 16 being parallel to and not collinear with the axis of the rotating shaft 15, and the moving disk 3 being sleeved on the outside of the drive rod 16; a counterweight, which is disposed at the end of the rotating shaft 15; and several bearings 17, with several bearings 17 disposed between the drive rod 16 and the moving disk 3, and between the rotating shaft 15 and the housing 9.

[0046] The drive component 14 is preferably a motor. During operation, the motor drives the rotating shaft 15 to rotate, which in turn drives the drive rod 16 to rotate eccentrically relative to the rotating shaft 15 within the housing 9. When the drive rod 16 rotates, it drives the moving disk 3 to oscillate back and forth relative to the stationary disk 1. The bearing 17 is used to reduce the friction between the rotating shaft 15 and the housing 9, and between the drive rod 16 and the moving disk 3. The counterweight is used to ensure that the dynamic balance of the entire mechanism meets the design requirements during operation. The number of counterweights can be one, two, or more. The counterweights can be set inside the cavity or outside the cavity.

[0047] This solution also includes a method for operating a positive displacement pump, comprising the following steps: S1, the first blocking part 12 and the second blocking part 13 abut against the two sides of the guide part 2, and the outlet 11 is closed. The first inner cavity 7 is zeroed, 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. S2, the first blocking part 12 isolates the inlet 10 and the first outer cavity 5. After the first outer cavity 5 finishes sucking up the material, the outlet 11 is opened. The second inner cavity 8 and the second outer cavity 6 are connected to form the discharge cavity 19. The first inner cavity 7 is connected to the inlet 10 and is in the process of sucking up the material. S3, Inlet 10 and outlet 11 are opened at the same time, feed chamber 18 and discharge chamber 19 appear at the same time, and discharge chamber 19 is connected to outlet 11 in the discharge process, feed chamber 18 is connected to inlet 10 in the feed process, first outer chamber 5 and second outer chamber 6 are connected, and the fluid sucked in by first outer chamber 5 is discharged into second outer chamber 6. S4. The second blocking part 13 separates the discharge chamber 19, the second outer chamber 6 is formed and undergoes a compression process, the second inner chamber 8 is in the discharge process, and the feed chamber 18 continues to perform the feeding process. S5. Repeat the above steps.

[0048] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for operating a positive displacement pump, characterized in that, The volumetric pump includes a fluid drive mechanism, which comprises a stationary disc, a moving disc, a housing, and a drive assembly. The stationary disc has a cavity and a guide portion disposed on the side wall of the cavity. The moving disc is oscillatingly disposed within the cavity and divides the cavity into a first outer cavity and a second outer cavity that are movably connected. The moving disc has a movable portion that is movably engaged with the guide portion to form a first inner cavity and a second inner cavity. The movable portion has a first blocking portion and a second blocking portion. The housing has an inlet and an outlet that communicate with the chamber. The operating method includes the following steps: S1, the first blocking part and the second blocking part abut against the two sides of the guide part respectively, and the outlet is closed. The first inner cavity is zeroed out, 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 part isolates the inlet and the first outer cavity. After the first outer cavity finishes feeding material, the outlet opens. The second inner cavity and the second outer cavity are connected to form the discharge cavity. The first inner cavity is connected to the inlet and is in the process of feeding material. S3. The inlet and outlet are opened simultaneously, the feed chamber and the discharge chamber appear at the same time, and the discharge chamber is connected to the outlet in the discharge process, the feed chamber is connected to the inlet in the feed process, the first outer chamber and the second outer chamber are connected, and the fluid absorbed by the first outer chamber is discharged into the second outer chamber. S4. The second blocking part separates the material chamber, the second outer chamber appears and undergoes a compression process, the second inner chamber is in the discharge process, and the feeding chamber continues to perform the feeding process. S5. Repeat steps S1-S4.

2. The method for operating a positive displacement pump as described in claim 1, characterized in that, The guide portion is T-shaped, and the moving portion is a trapezoidal groove. There is a gap between the trapezoidal groove and the guide portion that forms the first inner cavity and the second inner cavity. In steps S1-S4, the moving portion swings along the outer contour line of the guide portion.

3. The method for operating a positive displacement pump as described in claim 1, characterized in that, The contour lines on both sides of the guide are one or more combinations of arc curves, cycloids, and involutes. In steps S1-S4, the moving part oscillates along the contour lines of the guide.

4. The method of operating a positive displacement pump as described in claim 1, characterized in that, The number of the guide section and the moving section are both two or more. Each moving section swings synchronously along the corresponding guide section and performs the feeding, compression and discharging steps S1-S4.

5. The method for operating a positive displacement pump as described in claim 1, characterized in that, The drive assembly includes a drive component, a rotating shaft, and a drive rod. The drive component drives the rotating shaft to rotate, the rotating shaft drives the drive rod to rotate eccentrically, and the drive rod drives the moving plate to swing within the cavity, thereby realizing the reciprocating swing action of the moving plate in steps S1-S4.

6. The method of operating a positive displacement pump as described in claim 1, characterized in that, Bearings are provided between the drive rod and the moving disk, and between the rotating shaft and the housing. The moving disk swings around the drive rod through the bearings, reducing friction during the swinging process.

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