Plunger pump with suction and discharge combination valve

Abstract

The utility model relates to the technical field of plunger pumps, and discloses a plunger pump with a suction and discharge combination valve, which comprises a front shell, a rear shell and an end cover provided with a suction channel and a discharge channel. When the ceramic plunger moves outwards, fluid sucked into the channel pushes away the sealing plate to enter the cylinder under the action of pressure difference, when the ceramic plunger moves inwards, fluid in the cylinder pushes away the partition plate to enter the discharging channel under the action of pressure difference, and after fluid pressure disappears, the reset spring and the compression spring can enable the sealing plate and the partition plate to reset in time. The channel is closed, fluid backflow is effectively prevented, and normal work and work efficiency of the plunger pump are guaranteed; the sealing plate is used for sealing a cavity communicated with the tungsten carbide ceramic plunger type cylinder and the cone valve shell, the partition plate is used for sealing a cavity communicated with the discharging channel and the second through hole, fluid leakage is effectively prevented through sealing, the working reliability of the plunger pump is improved, and meanwhile environmental pollution and resource waste possibly caused by fluid leakage are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of plunger pump, concretely relates to a plunger pump with suction and discharge combined valve. BACKGROUND

[0002] In the pharmaceutical industry and chemical industry, as a kind of key fluid conveying equipment, the performance of plunger pump directly influences the running efficiency and stability of whole system. Among them, accurate fluid suction and discharge control mechanism and reliable sealing structure are the core elements to measure the performance of plunger pump.

[0003] Traditional plunger pump has certain deficiency in fluid control and sealing, for example, cannot accurately control fluid according to plunger movement state and cylinder pressure variation, easily leads to fluid backflow and influences the working efficiency of pump;Sealing structure design is unreasonable, so that fluid leakage phenomenon occurs frequently, which not only reduces the working reliability of pump, but also can cause pollution to environment and waste resources.

[0004] Therefore, the utility model is provided. UTILITY MODEL CONTENT

[0005] To solve the technical problems of traditional plunger pump in fluid control and sealing, for example, cannot accurately control fluid according to plunger movement state and cylinder pressure variation, easily leads to fluid backflow and influences the working efficiency of pump;Sealing structure design is unreasonable, so that fluid leakage phenomenon occurs frequently, which not only reduces the working reliability of pump, but also can cause pollution to environment and waste resources, the basic concept of technical scheme adopted by the utility model is:

[0006] A kind of plunger pump with suction and discharge combined valve, including front shell, the rear shell suitable for front shell and the end cover installed on the rear shell and opened with suction passage and discharge passage.

[0007] The first taper valve core with first through hole and the second taper valve core with second through hole are respectively slidably arranged in the taper valve shell, the suction inlet is opened in the top of the taper valve shell and communicated with the suction passage and the first through hole, the sealing plate is installed on the first taper valve core, the sealing plate is used to seal the chamber communicated by the tungsten carbide ceramic plunger cylinder and the taper valve shell, the back surface of the second taper valve core is installed with the partition plate, the partition plate is used to seal the chamber communicated by the discharge passage and the second through hole, and the flow passage for connecting the inner cavity of the tungsten carbide ceramic plunger cylinder and the second through hole is opened in the taper valve shell.

[0008] As a preferred embodiment of the utility model, the input shaft is rotatably installed in the front shell, the swash plate is installed on the input shaft, axial thrust bearings are installed at both ends of the swash plate, and the axial thrust bearings are installed on the inner wall of the front shell, the outer wall of the axial thrust bearing is slidably connected with the ceramic plunger.

[0009] As a preferred embodiment of the utility model, the ceramic sliding shoe is arranged on the end face of the axial thrust bearing, the ceramic sliding shoe is provided with an arc-shaped groove, a ball head is slidably arranged in the arc-shaped groove, the ball head is connected with the tail end of the ceramic plunger, a metal-coated sheet metal is installed on the side wall of the ceramic sliding shoe, the metal-coated sheet metal is connected with the ceramic plunger, and the metal-coated sheet metal is coated on the outer wall of the ball head.

[0010] As a preferred embodiment of the utility model, the ceramic plunger is provided with a baffle, the tungsten carbide ceramic plunger is provided with a nickel-based alloy spring, one end of the nickel-based alloy spring is clamped on the end face of the rear shell, and the other end of the nickel-based alloy spring is clamped on the baffle.

[0011] As a preferred embodiment of the utility model, the side wall of the sealing plate is provided with a push plate, the outer wall of the push plate is movably inserted into a mounting cover, the mounting cover is installed in the cone valve shell, a return spring is clamped between the inner part of the mounting cover and the push plate, and the compression direction of the return spring and the moving direction of the push plate are located on the same straight line.

[0012] As a preferred embodiment of the utility model, the side wall of the partition plate is provided with a top block, the top block is provided with a compression spring, the tail end of the compression spring is provided with a cover body, the cover body is installed on the side wall of the discharge channel, and the top block is inserted into the cover body.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model can accurately control the suction and discharge of fluid according to the motion state of the ceramic plunger and the change of the cylinder pressure, when the ceramic plunger moves outward, the fluid in the suction channel pushes away the sealing plate under the action of the pressure difference and enters the cylinder, when the ceramic plunger moves inward, the fluid in the cylinder pushes away the partition plate under the action of the pressure difference and enters the discharge channel, and after the fluid pressure disappears, the return spring and the compression spring can reset the sealing plate and the partition plate in time, close the channel, effectively prevent the backflow of fluid, ensure the normal work and work efficiency of the plunger pump, the sealing plate is used for sealing the chamber connected by the tungsten carbide ceramic plunger cylinder and the cone valve shell, the partition plate is used for sealing the chamber connected by the discharge channel and the second through hole, the sealing design effectively prevents the leakage of fluid, improves the work reliability and efficiency of the plunger pump, and reduces the environmental pollution and resource waste possibly caused by the leakage of fluid.

[0015] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] In the drawings:

[0017] Figure 1 is a planar sectional view of the present application;

[0018] Figure 2 is a partial enlarged view of the present application Figure 1

[0019] Figure 3 is an enlarged view of A in the present application Figure 1

[0020] In the figure: 1, front shell; 2, rear shell; 3, end cover; 4, suction passage; 5, discharge passage; 6, input shaft; 7, swash plate; 8, axial thrust bearing; 9, ceramic sliding shoe; 10, metal-coated sheet metal; 11, tungsten carbide ceramic plunger cylinder; 12, ceramic plunger; 13, ball head; 14, baffle; 15, nickel-based alloy spring; 16, cone valve housing; 17, suction port; 18, first cone valve core; 19, first through hole; 20, sealing plate; 21, push plate; 22, return spring; 23, mounting cover; 24, flow-through passage; 25, second cone valve core; 26, second through hole; 27, partition; 28, top block; 29, compression spring; 30, cover body. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be clearly and completely described below with reference to the drawings of the embodiments of the present application, and the following embodiments are used to illustrate the present application.

[0022] As Figures 1 to 3 shown, a plunger pump with a suction and discharge combined valve comprises a front shell 1, a rear shell 2 adapted to the front shell, and an end cover 3 installed on the rear shell and provided with a suction passage 4 and a discharge passage 5.

[0023] ​​A tungsten carbide ceramic plunger cylinder 11 is installed inside the front housing 1. A ceramic plunger 12 is inserted into the tungsten carbide ceramic plunger cylinder 11. A cone valve housing 16 is installed between the suction channel 4 and the discharge channel 5. A first cone valve core 18 with a first through hole 19 and a second cone valve core 25 with a second through hole 26 are slidably arranged inside the cone valve housing 16. A suction port 17 communicating with the suction channel 4 and the first through hole 19 is opened at the top of the cone valve housing 16. A sealing plate 20 is installed on the first cone valve core 18. The sealing plate 20 is used to seal the chamber connected between the tungsten carbide ceramic plunger cylinder 11 and the cone valve housing 16. A partition plate 27 is installed on the back of the second cone valve core 25. The partition plate 27 is used to seal the chamber connected between the discharge channel 5 and the second through hole 26. A flow channel 24 for connecting the inner cavity of the tungsten carbide ceramic plunger cylinder 11 and the second through hole 26 is opened inside the cone valve housing 16.

[0024] like Figures 1 to 3 As shown, in a specific embodiment, an input shaft 6 is rotatably mounted inside the front housing 1. A swashplate 7 is mounted on the input shaft 6, and axial thrust bearings 8 are mounted at both ends of the swashplate 7. The axial thrust bearings 8 are installed in the inner wall of the front housing 1, and the outer wall of the axial thrust bearings 8 is slidably connected to the ceramic plunger 12. This structure not only efficiently converts the rotation of the input shaft 6 into the reciprocating linear motion of the ceramic plunger 12, but also greatly reduces frictional losses between components, extends the service life of the equipment, and improves energy conversion efficiency while reducing energy consumption.

[0025] like Figures 1 to 3 As shown, furthermore, a ceramic slipper 9 is fitted to the end face of the axial thrust bearing 8. The ceramic slipper 9 has an arc-shaped groove, and a ball head 13 is slidably disposed in the arc-shaped groove. The ball head 13 is connected to the end of the ceramic plunger 12. A metal-clad sheet metal 10 is installed on the side wall of the ceramic slipper 9. The metal-clad sheet metal 10 is connected to the ceramic plunger 12, and the metal-clad sheet metal 10 covers the outer side wall of the ball head 13. This tightly fitted structure makes the force transmission more stable and precise, effectively reduces the gaps and looseness during the movement process, significantly improves the working accuracy and stability of the plunger pump, and thus improves the accuracy and stability of fluid delivery.

[0026] like Figures 1 to 3As shown, further, the ceramic plunger 12 is provided with a baffle 14, the outer wall of the tungsten carbide ceramic plunger cylinder 11 is provided with a nickel-based alloy spring 15, one end of the nickel-based alloy spring 15 is clamped on the end face of the rear shell 2, and the other end of the nickel-based alloy spring 15 is clamped on the baffle 14. The nickel-based alloy spring 15 has excellent elasticity and stability, which can not only ensure that the ceramic plunger 12 can be reset very smoothly when returning, but also can greatly buffer the movement of the ceramic plunger 12, effectively reducing the impact and wear between the ceramic plunger 12 and the tungsten carbide ceramic plunger cylinder 11, further prolonging the service life of the equipment and reducing the maintenance cost.

[0027] As shown in Figures 1 to 3 , further, the side wall of the sealing plate 20 is provided with a push plate 21, the outer wall of the push plate 21 is movably inserted with a mounting cover 23, the mounting cover 23 is mounted in the spool valve shell 16, the reset spring 22 is clamped between the inside of the mounting cover 23 and the push plate 21, and the compression direction of the reset spring 22 and the moving direction of the push plate 21 are on the same straight line. This design can ensure that the sealing plate 20 can be quickly and accurately opened and closed under the action of fluid pressure, efficiently control the suction process of the fluid, and after the fluid pressure disappears, the reset spring 22 can timely push the push plate 21 and the sealing plate 20 to reset, reliably close the communication between the tungsten carbide ceramic plunger cylinder 11 and the suction passage 4, effectively prevent the backflow of the fluid, and ensure the normal work and efficient operation of the plunger pump.

[0028] As shown in Figures 1 to 3 , further, the side wall of the partition plate 27 is provided with a top block 28, the top block 28 is provided with a compression spring 29, the end of the compression spring 29 is provided with a cover body 30, the cover body 30 is mounted on the side wall of the discharge passage 5, and the top block 28 is inserted in the cover body 30. This structure design can accurately control the discharge process of the fluid, when the pressure in the tungsten carbide ceramic plunger cylinder 11 rises, the partition plate 27 can smoothly overcome the elastic force of the compression spring 29 under the action of fluid pressure, timely open, make the tungsten carbide ceramic plunger cylinder 11 communicate with the discharge passage 5, and efficiently discharge the fluid. When the fluid pressure disappears, the compression spring 29 can quickly push the top block 28 and the partition plate 27 to reset, reliably close the communication between the tungsten carbide ceramic plunger cylinder 11 and the discharge passage 5, and also effectively prevent the backflow of the fluid, ensuring the stability and efficiency of the plunger pump.

[0029] The implementation principle of the plunger pump with a suction and discharge combined valve in this embodiment is as follows:

[0030] When the input shaft 6 rotates, the swash plate 7 mounted on the input shaft 6 rotates. Since the swash plate 7 is mounted with axial thrust bearings 8 at both ends, and the outer wall of the axial thrust bearings 8 is connected with the ceramic plunger 12 through the ceramic sliding shoe 9, ball head 13 and other structures, the rotation of the swash plate 7 will cause the eccentric movement of the axial thrust bearings 8. The eccentric movement of the axial thrust bearings 8 is transmitted to the ceramic plunger 12 through the ceramic sliding shoe 9 and the ball head 13, so that the ceramic plunger 12 makes reciprocating linear motion in the tungsten carbide ceramic plunger cylinder 11. The nickel-based alloy spring 15 is sleeved on the outer wall of the tungsten carbide ceramic plunger cylinder 11, one end is clamped on the end face of the rear shell 2, and the other end is clamped on the baffle 14 of the ceramic plunger 12, which can ensure the smooth reset of the ceramic plunger 12 during return, and can also buffer the movement of the ceramic plunger 12 to a certain extent.

[0031] When the ceramic plunger 12 moves outward in the tungsten carbide ceramic plunger cylinder 11 (away from the direction of the spool valve housing 16), the volume in the tungsten carbide ceramic plunger cylinder 11 increases, and the pressure decreases. At this time, the pressure in the suction passage 4 is greater than the pressure in the tungsten carbide ceramic plunger cylinder 11, and under the action of the pressure difference, the fluid enters the tungsten carbide ceramic plunger cylinder 11 by pushing away the sealing plate 20 through the suction port 17 and the first through hole 19. The sealing plate 20 overcomes the elastic force of the return spring 22 under the action of fluid pressure, so that the tungsten carbide ceramic plunger cylinder 11 is connected with the suction passage 4. When the fluid pressure disappears, the return spring 22 will push the push plate 21 and the sealing plate 20 to reset, closing the connection between the tungsten carbide ceramic plunger cylinder 11 and the suction passage 4.

[0032] When the ceramic plunger 12 moves inward in the tungsten carbide ceramic plunger cylinder 11 (towards the direction of the spool valve housing 16), the volume in the tungsten carbide ceramic plunger cylinder 11 decreases, and the pressure increases. At this time, the pressure in the tungsten carbide ceramic plunger cylinder 11 is greater than the pressure in the discharge passage 5, and the fluid enters the discharge passage 5 by pushing away the partition plate 27 through the flow passage 24 and the second through hole 26. The partition plate 27 overcomes the elastic force of the compression spring 29 under the action of fluid pressure, so that the tungsten carbide ceramic plunger cylinder 11 is connected with the discharge passage 5. The compression spring 29 is installed between the top block 28 and the cover body 30, and when the fluid pressure disappears, the compression spring 29 will push the top block 28 and the partition plate 27 to reset, closing the connection between the tungsten carbide ceramic plunger cylinder 11 and the discharge passage 5.

[0033] Through the continuous rotation of the input shaft 6, the ceramic plunger 12 is continuously reciprocated, realizing the continuous suction and discharge of the fluid, thereby completing the working process of the plunger pump. The design of the suction and discharge combined valve can effectively control the flow direction of the fluid and ensure the normal work of the plunger pump.

Claims

1. A plunger pump with suction and discharge combined valve, comprising a front shell (1), a rear shell (2) matched with the front shell, and an end cover (3) mounted on the rear shell and provided with a suction passage (4) and a discharge passage (5), characterized in that: the inside of the front shell (1) is provided with a tungsten carbide ceramic plunger cylinder (11), the inside of the tungsten carbide ceramic plunger cylinder (11) is inserted with a ceramic plunger (12), the tungsten carbide ceramic plunger cylinder (11) is installed with a conical valve shell (16) between the suction passage (4) and the discharge passage (5), the inside of the conical valve shell (16) is slidably provided with a first conical valve core (18) provided with a first through hole (19) and a second conical valve core (25) provided with a second through hole (26), the top of the conical valve shell (16) is provided with a suction port (17) communicated with the suction passage (4) and the first through hole (19), the first conical valve core (18) is installed with a sealing plate (20) for sealing the chamber communicated between the tungsten carbide ceramic plunger cylinder (11) and the conical valve shell (16), the back of the second conical valve core (25) is installed with a partition plate (27) for sealing the chamber communicated between the discharge passage (5) and the second through hole (26), and the inside of the conical valve shell (16) is provided with a flow passage (24) for connecting the inner cavity of the tungsten carbide ceramic plunger cylinder (11) and the second through hole (26). The input shaft (6) is rotatably installed in the inside of the front shell (1), the input shaft (6) is installed with a swash plate (7), the both ends of the swash plate (7) are installed with an axial thrust bearing (8), the axial thrust bearing (8) is installed in the inner wall of the front shell (1), and the outer side wall of the axial thrust bearing (8) is slidably connected with the ceramic plunger (12).

2. A piston pump with a suction and discharge combination valve according to claim 1, characterized in that The end face of the axial thrust bearing (8) is abuttingly provided with a ceramic sliding shoe (9), the ceramic sliding shoe (9) is provided with an arc-shaped groove, the arc-shaped groove is slidably provided with a ball head (13), the ball head (13) is connected with the tail end of the ceramic plunger (12), the side wall of the ceramic sliding shoe (9) is installed with a metal-coated sheet metal (10), the metal-coated sheet metal (10) is connected with the ceramic plunger (12), and the metal-coated sheet metal (10) is coated on the outer side wall of the ball head (13).

3. A piston pump with a suction and discharge combination valve according to claim 2, characterized in that The ceramic plunger (12) is installed with a baffle (14), the tungsten carbide ceramic plunger cylinder (11) is sleeved with a nickel-based alloy spring (15), one end of the nickel-based alloy spring (15) is clamped on the end face of the rear shell (2), and the other end of the nickel-based alloy spring (15) is clamped on the baffle (14).

4. A piston pump with a suction and discharge combination valve according to claim 1, characterized in that The side wall of the sealing plate (20) is installed with a push plate (21), the outer wall of the push plate (21) is movably inserted with a mounting cover (23), the mounting cover (23) is mounted in the conical valve shell (16), the inside of the mounting cover (23) and the push plate (21) are clamped with a reset spring (22), and the compression direction of the reset spring (22) and the moving direction of the push plate (21) are located on the same straight line.

5. A piston pump with a suction and discharge combination valve according to claim 1, characterized in that ​ 6. A piston pump with a suction and discharge combination valve according to claim 1, characterized in that The side wall of the partition (27) is provided with a top block (28), the top block (28) is provided with a compression spring (29), the end of the compression spring (29) is provided with a cover (30), the cover (30) is installed on the side wall of the discharge channel (5), and the top block (28) is inserted into the cover (30).

Images