Linkage assembly and cam pump with same

Abstract

The utility model relates to a linkage assembly and a cam pump with the linkage assembly, in particular to the technical field of cam pumps. The utility model provides a linkage assembly which comprises an eccentric wheel and a piston and is characterized in that the eccentric wheel is provided with a balance weight groove and a balance weight piece so as to adjust the position of the center of mass, reduce centrifugal force generated in rotation and achieve the vibration and noise reduction effect. In addition, the utility model further provides a cam pump which comprises the linkage assembly, a motor and an air cover assembly. The cam pump is ingenious in design, and efficient and low-noise gas transmission can be achieved. By optimizing the structural design and particularly introducing innovative elements such as the balance weight groove, the balance weight piece and the wall thickness adjusting groove, the working performance and the user experience of the cam pump are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of cam pumps, and in particular to a linkage assembly and a cam pump having the same. Background Art

[0002] Cam pumps, as a key equipment for fluid transmission, have played an indispensable role in many fields such as gas compression or liquid extraction. The core working principle of the cam pump is to rely on the cam mechanism driven by the motor, which further drives the piston to complete the reciprocating motion through the operation of this mechanism. The effective implementation of this reciprocating motion can periodically change the volume ratio of the air chamber, thereby ensuring that the fluid can be smoothly inhaled and discharged. Especially in medical and daily life applications, due to its strict requirements on the acoustic environment, the noise control level of the cam pump has gradually become an important indicator for evaluating its comprehensive performance.

[0003] The requirements for low noise in cam pump-related usage scenarios are becoming increasingly higher. Existing cam pumps have greater vibrations during actual use, resulting in greater noise, making it difficult to meet the increasingly lower noise requirements. Summary of the invention

[0004] In order to effectively reduce noise, the purpose of the present application is to provide a linkage assembly and a cam pump having the same.

[0005] In the first aspect, a linkage component provided by the present application adopts the following technical solution:

[0006] A linkage assembly includes an eccentric wheel and a piston, the piston has an adapter end, the eccentric wheel is provided with a connecting part, the adapter end is rotatably connected to the connecting part, the rotation axis of the connection between the adapter end and the connecting part is the output axis, the connecting part is provided with a power input hole for connecting to a motor, the axis of the power input hole is the input axis, the output axis is parallel to the input axis, the connecting part is also provided with a counterweight groove, the counterweight groove is located on the side of the input axis away from the output axis, and a counterweight piece is provided in the counterweight groove.

[0007] By adopting the above technical solution, the setting of the counterweight increases the weight on the side of the input axis away from the output axis, which can balance the forces on both sides of the input axis to reduce the centrifugal force of the eccentric wheel during movement. Since noise is mainly generated by vibration, and the linkage assembly in the cam pump has a precise structure and is more prone to vibration noise such as collision, the reduction of centrifugal force will also reduce the vibration caused by centrifugal force, thereby enabling the linkage assembly structure to reduce the noise of the cam pump.

[0008] Optionally, the counterweight piece is arranged in a block shape or a column shape, and there is an interference fit between the counterweight piece and the counterweight groove.

[0009] By adopting the above technical solution, the interference fit can ensure that the counterweight is firmly in the counterweight groove and will not fall off or shift during the rotation of the eccentric wheel. The stability of the counterweight installation is significantly improved, thereby reducing the additional noise and vibration caused by the displacement or falling of the counterweight, and further optimizing the vibration reduction and noise reduction effect.

[0010] Optionally, the eccentric wheel is provided with a wall thickness adjustment groove, and the wall thickness adjustment groove is located on a side of the input axis away from the counterweight groove.

[0011] By adopting the above technical solution, the wall thickness adjustment groove controls the wall thickness of the area where the input axis and the output axis are located by grooving, so that the wall thickness consistency of each part of the eccentric wheel itself is better, so that the eccentric wheel produced by injection molding has better life and performance.

[0012] Optionally, the cross section of the wall thickness adjustment groove is set in a crescent shape.

[0013] By adopting the above technical solution, the crescent-shaped setting can further adjust the local wall thickness of the eccentric wheel and can more finely adjust the center of mass position, which can ensure the adjustment effect without affecting the stability of the overall structure, effectively reduce the centrifugal force caused by the center of mass offset, and further reduce vibration and noise.

[0014] Optionally, the cross-sectional opening of the wall thickness adjustment groove faces the input axis.

[0015] By adopting the above technical solution, the output axis can be located inside the wall thickness adjustment groove or outside the groove and biased toward the input axis, thereby making the eccentric wheel structure compact.

[0016] Optionally, the bottom of the wall thickness adjustment groove is located in the connecting portion.

[0017] By adopting the above technical solution, the groove bottom is set in the connecting part, which can effectively deepen the depth of the wall thickness adjustment groove, so that the wall thickness of the connecting part can also be effectively controlled, so that the wall thickness consistency of multiple parts of the eccentric wheel is better, and it can be ensured that the opening of the wall thickness adjustment groove will not affect the overall strength of the eccentric wheel, thereby ensuring the long-term performance and safety of the linkage assembly.

[0018] Optionally, the openings of the connecting portion and the counterweight groove are located on two opposite surfaces of the eccentric wheel.

[0019] By adopting the above technical solution, this layout is convenient for the installation and adjustment of the counterweight and is also conducive to maintaining the dynamic balance of the eccentric wheel, thereby balancing the requirements of installation convenience and dynamic balance, and helping to improve the overall performance and service life of the linkage assembly.

[0020] In the second aspect, the present application provides a cam pump adopting the following technical solution:

[0021] A cam pump comprises the linkage assembly described in any one of the above items.

[0022] By adopting the above technical solution, the linkage assembly reduces the centrifugal force so that the vibration caused by the centrifugal force will also be reduced, thereby achieving the effect of reducing the overall vibration of the cam pump, thereby effectively reducing the noise of the cam pump.

[0023] Optionally, also include:

[0024] The motor provides power input to the linkage assembly;

[0025] The air cover assembly is installed on the motor, and the linkage assembly is located inside the air cover assembly; the air cover assembly includes a base, a valve seat, a pump cover and a diaphragm; the valve seat and the pump cover are fixed and sealed, the valve seat is installed with an intake check valve and an exhaust check valve, the pump cover has an intake chamber and an exhaust chamber, and the intake chamber and the exhaust chamber are not connected;

[0026] The diaphragm is clamped between the base and the valve seat, and a circulation air chamber is formed between the diaphragm and the valve seat. The circulation air chamber is unidirectionally connected to the air inlet chamber, and the circulation air chamber is unidirectionally connected to the exhaust chamber. The air inlet chamber and the exhaust chamber are not simultaneously connected to the circulation air chamber.

[0027] The piston has a reciprocating end, and the middle portion of the diaphragm is fixedly connected to the reciprocating end of the piston.

[0028] By adopting the above technical solution, the linkage assembly will drive the middle part of the diaphragm to reciprocate when working, thereby realizing the periodic change of the volume of the circulation chamber. The airflow noise generated during the periodic change of the volume of the circulation chamber can be further reduced by optimizing the sealing effect between the valve seat and the pump cover, thereby further reducing the noise of the cam pump.

[0029] Optionally, the pump cover and / or the valve seat are provided with ultrasonic wires, and the pump cover and the valve seat are fixedly connected by ultrasonic melting.

[0030] By adopting the above technical solution, the ultrasonic fusion connection technology can make the connection between the pump cover and the valve seat more firm and reliable, thereby improving the sealing of the air cover assembly, thereby reducing the noise leakage inside the air cover assembly to further achieve the noise reduction effect.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. Through the clever design of the counterweight slot and counterweight, the center of mass position is effectively adjusted, significantly reducing the generation of vibration and noise;

[0033] 2. The introduction of the wall thickness adjustment slot design makes the adjustment of the center of mass more precise and flexible, further reducing the vibration level while ensuring the consistency of the structure;

[0034] 3. The overall structural design of the cam pump is compact and reasonable. Through the synergistic effect of various components, efficient and low-noise gas transmission is achieved, meeting the user's demand for low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a vertical cross-sectional structure of the overall structure of an embodiment of the present application;

[0036] Figure 2 It is a schematic diagram of the explosion structure of an embodiment of the present application;

[0037] Figure 3 is a schematic cross-sectional structural diagram of a linkage assembly according to an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of the exploded structure of the linkage assembly of the embodiment of the present application;

[0039] Figure 5 It is a schematic diagram of the transverse cross-sectional structure of the linkage assembly of the embodiment of the present application.

[0040] In the figure, 1. motor; 11. power shaft; 2. linkage assembly; 21. eccentric wheel; 211. connecting part; 212. power input hole; 213. extension part; 214. counterweight groove; 215. wall thickness adjustment groove; L1. input axis; L2. output axis; 22. piston; 221. adapter end; 222. reciprocating end; 24. counterweight; 3. air cover assembly; 31. base; 32. back cover; 33. valve seat; 331. air inlet hole; 332. exhaust hole; 333. air inlet check valve; 334. exhaust check valve; 34. pump cover; 341. air inlet chamber; 342. exhaust chamber; 35. diaphragm; 351. circulation air chamber; 36. fixing part; 37. ultrasonic line. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-5 , further details of this application are given.

[0042] The embodiment of the present application discloses a cam pump, which mainly achieves noise reduction by optimizing the structural design of the linkage assembly. The cam pump is also known by various names such as diaphragm pump, piston pump or horizontal pump in the cognition of those skilled in the art. It can transport fluid, and the transported fluid object can be gas or liquid. For the convenience of description, the gas used in this embodiment is illustrated by way of example. Therefore, the gas cover assembly is only used for gas transportation in this embodiment, and can also be used for fluid transportation in the actual operating environment. The design core of the present application lies in the linkage assembly, which can be replaced in various types of cam pumps.

[0043] Reference Figure 1 and Figure 2A cam pump includes a motor 1, a linkage assembly 2 and an air cap assembly 3. The motor 1 has a power shaft 11, and the motor 1 can output power through the power shaft 11 after being energized. The linkage assembly 2 is used to receive the power transmitted from the power shaft 11 of the motor 1. The air cap assembly 3 is installed on the motor 1, and the linkage assembly 2 is located in the air cap assembly 3. The linkage assembly 2 causes the volume of the air chamber in the air cap assembly 3 to change periodically, thereby ensuring that the fluid can be smoothly inhaled and discharged.

[0044] Reference Figure 1 and Figure 2 The linkage assembly 2 includes an eccentric wheel 21 and a piston 22.

[0045] Reference Figure 2 and Figure 3 The eccentric wheel 21 is provided with a connection portion 211 protruding downward, and the connection portion 211 is provided with a power input hole 212 for connecting the motor 1. The power input hole 212 is fixedly connected to the power shaft 11 of the motor 1 by interference fit, so that the eccentric wheel 21 can be driven to rotate by the power shaft 11. In order to improve the connection stability between the power shaft 11 and the power input hole 212, the eccentric wheel 21 is also provided with an extension portion 213 protruding upward, and the bottom of the power input hole 212 extends into the extension portion 213, thereby increasing the hole depth of the power input hole 212 to increase the direct contact area between the power shaft 11 and the power input hole 212, thereby achieving the effect of increasing the maximum friction force.

[0046] Reference Figure 3 and Figure 4 The piston 22 has a transfer end 221 and a reciprocating end 222, which are respectively located at two ends of the piston 22. The transfer end 221 is arranged in a quasi-annular or cylindrical shape, and the shape of the connecting portion 211 of the eccentric wheel 21 is adapted to the shape of the reciprocating end 222. The transfer end 221 and the connecting portion 211 are connected through a bearing so that the transfer end 221 and the connecting portion 211 are rotatably connected and will not be separated.

[0047] The axis of the power input hole 212 is the input axis L1, and the rotation axis of the connection between the adapter end 221 and the connecting portion 211 is the output axis L2. The output axis L2 is parallel to the input axis L1. When the eccentric wheel 21 rotates, the output axis L2 rotates around the input axis L1. When the motor 1 is powered on, the power shaft 11 rotates to drive the eccentric wheel 21 to rotate. The adapter end 221 of the piston 22 drives the reciprocating end 222 of the piston 22 to periodically approach and move away from the eccentric wheel 21 under the drive of the eccentric wheel 21.

[0048] In order to reduce the centrifugal force, the connecting portion 211 is also provided with a counterweight groove 214, which is located on the side of the input axis L1 away from the output axis L2, and the opening of the counterweight groove 214 and the connecting portion 211 are located on two opposite surfaces of the eccentric wheel 21. A counterweight 24 is provided in the counterweight groove 214. The counterweight 24 is a metal part. Compared with the eccentric wheel 21 made of plastic, the density of the counterweight 24 is greater. By changing the material and / or weight of the counterweight 24, the position of the center of mass of the eccentric wheel 21 can be conveniently adjusted. The counterweight 24 is arranged in a block or columnar shape, and the shape and depth of the counterweight groove 214 are adapted to the counterweight 24, and the counterweight 24 and the counterweight groove 214 are interference fit. The edge of the counterweight 24 can be provided with a chamfer to facilitate the installation of the counterweight 24 into the counterweight groove 214.

[0049] In order to improve the consistency of the wall thickness of the eccentric wheel 21, the eccentric wheel 21 is provided with a wall thickness adjustment groove 215, and the opening of the wall thickness adjustment groove 215 and the opening of the counterweight groove 214 are located on the same surface of the eccentric wheel 21. The wall thickness adjustment groove 215 is located on the side of the input axis L1 away from the counterweight groove 214, and the groove bottom of the wall thickness adjustment groove 215 is located in the connecting portion 211 so that the output axis L2 is located within the range of the wall thickness adjustment groove 215, so that when the connecting portion 211 of the eccentric wheel 21 and the adapter end 221 of the piston 22 interact with each other, the connecting portion 211 is not easy to deform, thereby balancing the structural stability of the eccentric wheel 21 and the wall thickness consistency requirements as much as possible. The cross section of the wall thickness adjustment groove 215 is set in a crescent shape, and the crescent opening of the wall thickness adjustment groove 215 faces the input axis L1.

[0050] Reference Figure 5 The air cover assembly 3 includes a base 31 , a back cover 32 , a valve seat 33 , a pump cover 34 and a diaphragm 35 .

[0051] The base 31 is fixedly connected to one end of the power shaft 11 of the motor 1, and the power shaft 11 of the motor 1 extends into the base 31. The side of the base 31 away from the motor 1 has an opening for installing the back cover 32. After the linkage assembly 2 and the power shaft 11 of the motor 1 are installed, the back cover 32 is installed in the opening to close the base 31, thereby reducing dust and other foreign matter from entering the base 31.

[0052] The diaphragm 35 is designed in a disk-like shape and is made of elastic materials such as rubber or silicone. The edge of the diaphragm 35 is sandwiched between the base 31 and the valve seat 33. The diaphragm 35 completely isolates the space between the base 31 and the valve seat 33 so that the gas between the base 31 and the valve seat 33 cannot flow. The space formed between the diaphragm 35 and the valve seat 33 is a circulation air chamber 351.

[0053] The reciprocating end 222 of the piston 22 is arranged in a disc-like shape, and the plane where the reciprocating end 222 is located is perpendicular to the plane where the cross section of the adapter end 221 is located. The middle part of the diaphragm 35 is fixed to the reciprocating end 222 of the piston 22 by a fixing member 36. When the reciprocating end 222 of the piston 22 is driven by the eccentric wheel 21 to move away from the eccentric wheel 21, the reciprocating end 222 of the piston 22 drives the middle part of the diaphragm 35 to move in a direction away from the eccentric wheel 21 so that the volume of the circulation air chamber 351 is reduced. When the reciprocating end 222 of the piston 22 is driven by the eccentric wheel 21 to approach the eccentric wheel 21, the reciprocating end 222 of the piston 22 drives the middle part of the diaphragm 35 to move in a direction away from the eccentric wheel 21 so that the volume of the circulation air chamber 351 is increased.

[0054] The pump cover 34 and the valve seat 33 are fixedly and sealedly connected, and the fixing method may be ultrasonic melting connection, that is, an ultrasonic line 37 is provided on the pump cover 34 and / or the valve seat 33, and the pump cover 34 and the valve seat 33 are fixedly connected by ultrasonic melting. In this embodiment, the ultrasonic line 37 is located on the side of the pump cover 34 facing the valve seat 33, and is arranged around the edge of the pump cover 34, and the valve seat 33 is adaptively provided with an ultrasonic groove for the ultrasonic line 37 to be embedded.

[0055] The pump cover 34 has an air inlet chamber 341 and an air outlet chamber 342, which are isolated from each other and not connected. The valve seat 33 is provided with an air inlet hole 331 and an air outlet hole 332, which are isolated from each other and not connected. One end of the air inlet hole 331 is used to connect to the air inlet chamber 341 and the other end is connected to the circulation chamber 351, and one end of the air outlet hole 332 is used to connect to the exhaust chamber 342 and the other end is connected to the circulation chamber 351.

[0056] An intake check valve 333 is installed at the open end surface area of ​​the circulation air chamber 351 connected to the air inlet hole 331, so that the circulation air chamber 351 is connected to the air inlet chamber 341 in one direction, that is, the gas in the air inlet chamber 341 can only flow in one direction to the circulation air chamber 351. An exhaust check valve 334 is installed at the open end surface area of ​​the exhaust hole 332 for connecting to the exhaust chamber 342, so that the circulation air chamber 351 is connected to the exhaust chamber 342 in one direction, that is, the gas in the circulation air chamber 351 can only flow in one direction to the exhaust chamber 342, thereby realizing that the air inlet chamber 341 and the exhaust chamber 342 are not connected to the circulation air chamber 351 at the same time.

[0057] When the volume of the circulation chamber 351 increases, the air pressure in the circulation chamber 351 is lower than the air pressure in the intake chamber 341, so that the intake check valve 333 is opened, and the air pressure in the circulation chamber 351 is lower than the air pressure in the exhaust chamber 342, so that the exhaust check valve 334 is closed, and the gas in the intake chamber 341 flows unidirectionally to the circulation chamber 351 to complete the intake. When the volume of the circulation chamber 351 decreases, the air pressure in the circulation chamber 351 is higher than the air pressure in the exhaust chamber 342, so that the exhaust check valve 334 is opened, and the air pressure in the circulation chamber 351 is lower than the air pressure in the intake chamber 341, so that the intake check valve 333 is closed, and the gas in the circulation chamber 351 flows unidirectionally to the exhaust chamber 342 to complete the exhaust.

[0058] The implementation principle of a cam pump in the embodiment of the present application is:

[0059] (1) When air is inhaled, the motor 1 is energized to rotate the power shaft 11, and the eccentric wheel 21 is driven to rotate by the power shaft 11. The adapter end 221 of the piston 22 is driven by the eccentric wheel 21 to drive the reciprocating end 222 of the piston 22 to move away from the eccentric wheel 21 by the eccentric wheel 21. The reciprocating end 222 of the piston 22 drives the middle part of the diaphragm 35 to move in a direction away from the eccentric wheel 21 to reduce the volume of the circulation air chamber 351. At this time, the air pressure in the circulation air chamber 351 is lower than the air pressure in the intake chamber 341, so that the intake check valve 333 is opened, and the air pressure in the circulation air chamber 351 is lower than the air pressure in the exhaust chamber 342, so that the exhaust check valve 334 is closed. The gas in the intake chamber 341 flows unidirectionally to the circulation air chamber 351 to complete the air intake.

[0060] (2) During exhaust, the motor 1 is energized to make the power shaft 11 continue to rotate, and the eccentric wheel 21 is driven to rotate by the power shaft 11. The adapter end 221 of the piston 22 is driven by the eccentric wheel 21 to drive the reciprocating end 222 of the piston 22 to approach the eccentric wheel 21. The reciprocating end 222 of the piston 22 drives the middle part of the diaphragm 35 to move away from the eccentric wheel 21 to increase the volume of the circulation air chamber 351. At this time, the air pressure in the circulation air chamber 351 is greater than the air pressure in the exhaust chamber 342, so that the exhaust check valve 334 is opened, and the air pressure in the circulation air chamber 351 is less than the air pressure in the intake chamber 341, so that the intake check valve 333 is closed. The gas in the circulation air chamber 351 flows unidirectionally to the exhaust chamber 342 to complete the exhaust.

[0061] The embodiments of this specific implementation method are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, and the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A linkage component, characterized in that: The invention comprises an eccentric wheel (21) and a piston (22), wherein the piston (22) has a transfer end (221), the eccentric wheel (21) is provided with a connecting portion (211), the transfer end (221) is rotatably connected to the connecting portion (211), the rotation axis at the connection between the transfer end (221) and the connecting portion (211) is an output axis (L2), the connecting portion (211) is provided with a power input hole (212) for connecting to a motor (1), the axis of the power input hole (212) is an input axis (L1), the output axis (L2) is parallel to the input axis (L1), and the connecting portion (211) is further provided with a counterweight groove (214), the counterweight groove (214) is located on a side of the input axis (L1) away from the output axis (L2), and a counterweight member (24) is provided in the counterweight groove (214).

2. A linkage assembly according to claim 1, characterized in that: The counterweight piece (24) is arranged in a block shape or a column shape, and the counterweight piece (24) and the counterweight groove (214) are interference-fitted.

3. A linkage assembly according to claim 1, characterized in that: The eccentric wheel (21) is provided with a wall thickness adjustment groove (215), and the wall thickness adjustment groove (215) is located on a side of the input axis (L1) away from the counterweight groove (214).

4. A linkage assembly according to claim 3, characterized in that: The cross section of the wall thickness adjustment groove (215) is arranged in a crescent shape.

5. A linkage assembly according to claim 4, characterized in that: The cross-sectional opening of the wall thickness adjustment groove (215) faces the input axis (L1).

6. A linkage assembly according to claim 3, characterized in that: The output axis (L2) is located within the range of the wall thickness adjustment groove (215).

7. A linkage assembly according to claim 1, characterized in that: The openings of the connecting portion (211) and the counterweight groove (214) are located on two opposite surfaces of the eccentric wheel (21).

8. A cam pump, characterized in that: It comprises a linkage assembly (2) as described in any one of claims 1 to 7.

9. A cam pump according to claim 8, characterized in that: Also includes: A motor (1) is provided to provide power input to the linkage assembly (2); An air cover assembly (3) is mounted on the motor (1), and the linkage assembly (2) is located inside the air cover assembly (3); the air cover assembly (3) comprises a base (31), a valve seat (33), a pump cover (34) and a diaphragm (35); The valve seat (33) and the pump cover (34) are fixedly and sealedly connected, the valve seat (33) is equipped with an intake check valve (333) and an exhaust check valve (334), the pump cover (34) has an intake chamber (341) and an exhaust chamber (342), and the intake chamber (341) and the exhaust chamber (342) are not connected; The diaphragm (35) is clamped between the base (31) and the valve seat (33); a circulation air chamber (351) is formed between the diaphragm (35) and the valve seat (33); the circulation air chamber (351) is unidirectionally connected to the air inlet chamber (341); the circulation air chamber (351) is unidirectionally connected to the air exhaust chamber (342); the air inlet chamber (341) and the air exhaust chamber (342) are not simultaneously connected to the circulation air chamber (351); the piston (22) has a reciprocating end (222); the middle portion of the diaphragm (35) is fixedly connected to the reciprocating end (222) of the piston (22).

10. A cam pump according to claim 9, characterized in that: The pump cover (34) and / or the valve seat (33) are provided with an ultrasonic line (37), and the pump cover (34) and the valve seat (33) are fixedly connected by ultrasonic melting.

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