Double-cam structure of plunger metering pump
Through the dual cam structure and sliding cavity design, the problem of unstable flow of the backflow of the plunger metering pump under high pressure is solved, and a stable liquid transport effect is achieved.
Patent Information
- Application Number
- CN202421978967.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-15
AI Technical Summary
In the case of high flow and high pressure, the repetition accuracy of the return flow inlet is unstable and cannot accurately fit the cam, resulting in large changes in flow accuracy.
The double cam structure adopts, and the two cams rotatably connected to the box drive the piston rod to perform stable reciprocating linear motion. Combined with the design of the sliding cavity, diaphragm and spring, it ensures that the piston rod accurately fits with the cam under high pressure and achieves stable liquid transportation.
Under large flow and high pressure, the repetition accuracy of the return flow flow is ensured to stable, improve the use effect, and reduce the instability of flow changes.
Smart Images
Figure CN223075698U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plunger metering pumps, in particular to a double-cam structure of a plunger metering pump. Background Technique
[0002] The operation of a plunger metering pump is completed by the reciprocating movement of a plunger. The plunger pump uses a cam to drive the lift and a spring to drive the return stroke. Therefore, it is also called a reciprocating spring plunger cam pump. It has the advantages of high pressure resistance, high flow accuracy, and mature control technology. However, limited by the frequency of the reciprocating movement of the spring, in the case of large flow and high pressure operation, the return stroke cannot accurately fit the cam, and the repeatability accuracy of the liquid inflow during the return stroke varies greatly under different pressure conditions. Content of the Utility Model
[0003] The purpose of the utility model is to provide a double-cam structure of a plunger metering pump, aiming to solve the problems mentioned in the above background technique.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme: The double-cam structure of the plunger metering pump includes a driving part, a sliding part, and a conveying part. The driving part includes a box body. Two cams are horizontally arranged inside the box body. The cams are rotationally connected to the box body through rotating shafts. The end parts of the two rotating shafts are respectively provided with driven gears. A housing is arranged on the side of the box body. The two driven gears are located inside the housing. A motor is arranged inside the housing. The output end of the motor is provided with a main gear. The main gear is externally meshed with the two driven gears at the same time. The sliding part includes a sliding cavity that is connected to the box body in a penetrating manner. A piston rod is slidably connected inside the sliding cavity. One end of the piston rod is provided with a U-shaped card slot. One end of the card slot is provided with a cross bar. The cross bar is located between the two cams. The outer surface of the cross bar is in contact with the outer surfaces of the two cams on both sides. Through grooves are symmetrically opened on the outer surface of the card slot. The rotating shaft located between the piston rod and the cross bar is located inside the through grooves. The driving part controls the movement of the sliding part to control the liquid to pass through the conveying part.
[0005] Preferably, the conveying part includes a conveying cavity. The two ends and the middle position of the conveying cavity are open. One end of the sliding cavity is arranged at the middle opening position of the conveying cavity and is fixedly connected to the conveying cavity. A diaphragm is arranged at the middle opening of the sliding cavity. The diaphragm is used to separate the middle opening of the conveying cavity from the two end openings of the conveying cavity. One end of the piston rod is fixedly connected to the diaphragm. Annular partition plates are arranged on the upper and lower sides inside the conveying cavity. An annular baffle is arranged above each partition plate. A first spring is arranged at the lower end of the baffle. A sphere for closing the partition plate is arranged at the lower end of the first spring.
[0006] Preferably, the outer surface of the card slot is symmetrically provided with a retaining rod, and further includes a second spring sleeved on the piston rod. One end of the second spring abuts against the sliding cavity, and the other end of the second spring abuts against the retaining rod.
[0007] Preferably, the cross bar is rotatably connected to the card slot.
[0008] Preferably, a sealing ring is provided on the outer surface of the piston rod.
[0009] The beneficial effects of the present utility model are:
[0010] Through the double-cam structure provided, the device can control the piston rod to perform stable reciprocating linear motion. Under the working conditions of large flow rate and high pressure, the cross bar can always accurately fit the cam, and the repeatability accuracy of the liquid inflow during the return stroke changes little under different pressure conditions, with good use effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a top view of a specific embodiment of the present utility model.
[0012] Figure 2 is a side view of the box body of a specific embodiment of the present utility model.
[0013] Figure 3 is a schematic structural diagram of the card slot of a specific embodiment of the present utility model.
[0014] In the figure: 1, box body; 2, cam; 3, rotating shaft; 4, driven gear; 5, housing; 6, motor; 7, main gear; 8, sliding cavity; 9, piston rod; 10, card slot; 11, cross bar; 12, through groove; 13, conveying cavity; 14, diaphragm; 15, partition board; 16, baffle; 17, first spring; 18, sphere; 19, retaining rod; 20, second spring; 21, sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following further describes the specific embodiments of the present utility model with reference to the drawings.
[0016] Such as Figures 1-3As shown in the figure, a double-cam structure of a plunger metering pump includes a driving part, a sliding part and a conveying part. The driving part includes a box body 1. Inside the box body 1, two cams 2 are horizontally arranged. The cams 2 are rotatably connected to the box body 1 through a rotating shaft 3. At the end parts of the two rotating shafts 3, driven gears 4 are respectively arranged. On the side part of the box body 1, a housing 5 is arranged. The two driven gears 4 are located inside the housing 5. Inside the housing 5, a motor 6 is arranged. At the output end of the motor 6, a main gear 7 is arranged. The main gear 7 is externally meshed with the two driven gears 4 at the same time. The sliding part includes a sliding cavity 8 which is connected to the box body 1 in a penetrating manner. Inside the sliding cavity 8, a piston rod 9 is slidably connected. At one end of the piston rod 9, a U-shaped clamping groove 10 is arranged. At one end of the clamping groove 10, a cross bar 11 is arranged. The cross bar 11 is located between the two cams 2. The outer surface of the cross bar 11 keeps in contact with the outer surfaces of the two cams 2 on both sides. Through holes 12 are symmetrically arranged on the outer surface of the clamping groove 10. The rotating shaft 3 located between the piston rod 9 and the cross bar 11 is located inside the through holes 12. The driving part controls the movement of the sliding part to control the liquid to pass through the conveying part.
[0017] The placement methods of the two cams 2 are the same. When the cams 2 rotate, the cross bar 11 will follow the cams 2 to make a linear reciprocating movement, thereby driving the piston rod 9 to make a linear reciprocating movement inside the sliding cavity 8. Specifically, control the motor 6 to start. The output end of the motor 6 drives the main gear 7 to rotate. When the main gear 7 rotates, it drives the two driven gears 4 externally meshed with it to rotate at the same time. The specifications of the two driven gears 4 are exactly the same, and the main gear 7 is located at the exact middle position between the two driven gears 4. When the main gear 7 rotates, the rotation directions of the two driven gears 4 are the same. When the two driven gears 4 rotate, they drive the two cams 2 to rotate through the rotating shaft 3. The rotation directions of the two cams 2 are the same. When the cams 2 rotate, through continuous abutment with the cross bar 11, the clamping groove 10 can be driven to move, and then the piston rod 9 is driven to make a reciprocating linear movement inside the sliding cavity 8 through the clamping groove 10.
[0018] Furthermore, the conveying part includes a conveying cavity 13. Both ends and the middle position of the conveying cavity 13 are open. One end of the sliding cavity 8 is arranged at the middle opening position of the conveying cavity 13 and is fixedly connected to the conveying cavity 13. A diaphragm 14 is arranged at the middle opening of the sliding cavity 8. The diaphragm 14 is used to separate the middle opening of the conveying cavity 13 from the openings at both ends of the conveying cavity 13. One end of the piston rod 9 is fixedly connected to the diaphragm 14. Annular partitions 15 are arranged on both the upper and lower sides inside the conveying cavity 13. An annular baffle 16 is arranged above each partition 15. A first spring 17 is arranged at the lower end of the baffle 16. A sphere 18 for closing the partition 15 is arranged at the lower end of the first spring 17. When the piston rod 9 makes a reciprocating linear motion, the liquid can be conveyed through the cooperation with the diaphragm 14. Specifically, when the piston rod 9 squeezes the space inside the conveying cavity 13 through the diaphragm 14, the first spring 17 located below always presses the sphere 18 against the partition 15 where it is located. The liquid inside the conveying cavity 13 applies pressure to the sphere 18 above, causing the first spring 17 above to compress and the sphere 18 above to move upward, so that the partition 15 above is penetrated. The liquid inside the conveying cavity 13 can enter the outside of the conveying cavity 13 through the partition 15 above. When the piston rod 9 retracts, it drives the diaphragm 14 to move towards the sliding cavity 8. Under the action of the external atmospheric pressure, the sphere 18 above blocks the partition 15 above. The sphere 18 below will move upward under the action of the atmospheric pressure and compress the first spring 17 below. At this time, the partition 15 below is penetrated, and the external liquid can enter the conveying cavity 13 through the partition 15 below. Therefore, by driving the reciprocating movement of the diaphragm 14 by the piston rod 9, the liquid can be continuously conveyed.
[0019] Furthermore, stop rods 19 are symmetrically arranged on the outer surface of the card slot 10. A second spring 20 sleeved on the piston rod 9 is also included. One end of the second spring 20 abuts against the sliding cavity 8, and the other end of the second spring 20 abuts against the stop rod 19. The second spring 20 is always in a compressed state. The second spring 20 can keep the cross bar 11 in contact with the outer surface of the cam 2 relatively far from the second spring 20 through the stop rod 19, thereby improving the smoothness of the piston rod 9 during reciprocating linear motion.
[0020] Furthermore, the cross bar 11 is rotatably connected to the card slot 10. The cross section of the cross bar 11 is circular. The cross bar 11 can reduce the friction with the cam 2 through its own rotation, thereby reducing wear.
[0021] Furthermore, a sealing ring 21 is arranged on the outer surface of the piston rod 9 to improve the sealing between the piston rod 9 and the sliding cavity 8.
[0022] Through the double-cam 2 structure provided, the device can control the piston rod 9 to perform stable reciprocating linear motion. Under the working conditions of large flow rate and high pressure, the cross bar 11 can always accurately fit the cam 2, and the repeatability accuracy of the liquid inflow during the return stroke varies little under different pressure conditions, with good use effects.
[0023] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
Claims
1. A double-cam structure of a plunger metering pump, characterized in that, It includes a driving part, a sliding part and a conveying part. The driving part includes a box body. Inside the box body, two cams are horizontally arranged. The cams are rotationally connected to the box body through rotating shafts. At the end parts of the two rotating shafts, driven gears are respectively arranged. On the side part of the box body, a housing is arranged. The two driven gears are located inside the housing. Inside the housing, a motor is arranged. At the output end of the motor, a main gear is arranged. The main gear is externally meshed with the two driven gears at the same time. The rotation directions of the two driven gears are the same, and the rotation directions of the two cams are the same. The sliding part includes a sliding cavity that is connected to the box body in a penetrating manner. Inside the sliding cavity, a piston rod is slidably connected. At one end of the piston rod, a U-shaped clamping groove is arranged. At one end of the clamping groove, a cross bar is arranged. The cross bar is located between the two cams. The outer surface of the cross bar keeps in contact with the outer surfaces of the two cams on both sides. Through grooves are symmetrically arranged on the outer surface of the clamping groove. The rotating shaft located between the piston rod and the cross bar is located inside the through grooves. The driving part controls the movement of the sliding part to control the liquid to pass through the conveying part.
2. The double-cam structure of the plunger metering pump according to claim 1, wherein The conveying part includes a conveying cavity. The two ends and the middle position of the conveying cavity are open. One end of the sliding cavity is arranged at the middle opening position of the conveying cavity and is fixedly connected to the conveying cavity. At the middle opening of the sliding cavity, a diaphragm is arranged. The diaphragm is used to separate the middle opening of the conveying cavity from the two end openings of the conveying cavity. One end of the piston rod is fixedly connected to the diaphragm. Annular partitions are arranged on the upper and lower sides inside the conveying cavity. Above each partition, an annular baffle is arranged. At the lower end of the baffle, a first spring is arranged. At the lower end of the first spring, a sphere for closing the partition is arranged.
3. The double-cam structure of the plunger metering pump according to claim 1, characterized in that, On the outer surface of the clamping groove, retaining rods are symmetrically arranged. It also includes a second spring sleeved on the piston rod. One end of the second spring abuts against the sliding cavity, and the other end of the second spring abuts against the retaining rod.
4. The double-cam structure of the plunger metering pump according to claim 1, characterized in that, The cross bar is rotationally connected to the clamping groove.
5. The double-cam structure of the plunger metering pump according to any one of claims 1-4, characterized in that, A sealing ring is arranged on the outer surface of the piston rod.