Silent pump

Abstract

The utility model discloses a mute pump, which belongs to the technical field of diaphragm pumps and comprises a driver, a pump body and a pump cavity, the driver is connected to one side of the pump body, the pump cavity is connected to the other side of the pump body, the pump body comprises a coupler, an eccentric shaft, an eccentric wheel and a connecting rod assembly, one end of the coupler is connected with the driver, and the other end of the coupler is connected with the eccentric shaft. One end of the connecting rod assembly is connected with the pump cavity, the other end of the connecting rod assembly is connected with the eccentric shaft, the eccentric shaft is sleeved with the eccentric wheel to form an eccentric structure, one end of the connecting rod assembly is rotationally connected to the eccentric wheel, and the other end of the connecting rod assembly does piston motion in the pump cavity so as to change the volume of the pump cavity; and the rubber coating layer is arranged on the inner wall, making contact with the connecting rod assembly, of the eccentric wheel, the coupler and the rubber coating layer can absorb vibration in transmission, noise generated during operation of the mute pump is reduced, the noise frequency of the mute pump is fixed, and external noise reduction treatment is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm pumps, in particular to a silent pump. Background Art

[0002] A micro air pump is a gas delivery device that is small in size, uses a gaseous working medium, and is mainly used for gas sampling, gas circulation, vacuum adsorption, vacuum pressure maintenance, exhaust, inflation, and pressurization. Micro air pumps are divided into: micro negative pressure pumps, micro vacuum pumps, micro gas circulation pumps, micro air pumps, micro gas sampling pumps, micro air pumps, micro air pumps, and micro air exhaust and inflation dual-purpose pumps, etc.; according to the working principle, there are diaphragm type, electromagnetic type, impeller type, and piston type, etc. The micro air pumps that are widely used in general medical and health, scientific research, laboratories, environmental protection, instrumentation, chemicals, robots and other industries mainly refer to micro vacuum pumps. Traditional air pumps will generate a lot of noise when working due to their fixed connecting rod and piston structure, which will not provide a good user experience. It will also cause excessive vibration of internal parts, reducing the life of the micro air pump. Now there is a need for a silent pump that can reduce the internal vibration of the connecting rod and piston.

[0003] The existing patent application with publication number CN105134562A discloses a micro piston air pump, including a pump air chamber and a pressure storage chamber which is an integral structure with the pump air chamber and connected by a pipeline; the pump air chamber includes a cylinder and a power chamber fixed on the lower side of the cylinder, and the piston in the cylinder is connected to the motor in the power chamber through a connecting rod; a cylinder head is provided on the top of the cylinder, and the cylinder head is screwed together with the cylinder; a cover plate is provided at the bottom of the power chamber, and the cover plate is snapped together with the power chamber; the connecting rod is movably connected to the piston. The micro piston air pump is limited by the connecting rod and piston structure, and will generate fixed vibration and noise during operation, resulting in poor user experience and shortened life. Utility Model Content

[0004] The utility model aims to provide a silent pump, which solves the problem of excessive noise and vibration generated by the existing micro air pump during operation.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] A silent pump comprises a driver, a pump body and a pump chamber, wherein the driver is connected to one side of the pump body, and the pump chamber is connected to the other side of the pump body. The pump body comprises a coupling, an eccentric shaft, an eccentric wheel and a connecting rod assembly, wherein one end of the coupling is connected to the driver, and the other end is connected to the eccentric shaft. The eccentric wheel is sleeved on the eccentric shaft to form an eccentric structure, one end of the connecting rod assembly is rotatably connected to the eccentric wheel, and the other end performs piston motion in the pump chamber to change the volume of the pump chamber. The eccentric wheel comprises a rubber coating, and the rubber coating is arranged on the inner wall where the eccentric wheel contacts the connecting rod assembly. The coupling and the rubber coating can absorb vibration in transmission, reduce noise during operation of the silent pump, and fix the noise frequency of the silent pump, thereby facilitating external noise reduction treatment.

[0007] Furthermore, the coupling includes a plurality of diaphragms, and two adjacent diaphragms are flexibly connected to absorb the error of vibration and the impact during speed change.

[0008] Furthermore, the rubber coating layer is made of silicone, and the rubber coating layer and the eccentric wheel are integrally formed, so as to absorb the transmission deviation between the eccentric wheel and the connecting rod assembly.

[0009] Preferably, it further comprises a first bearing, the outer ring of the first bearing abuts against the connecting rod assembly, and the inner ring of the first bearing abuts against the eccentric wheel, so as to extend the service life of the connecting rod assembly.

[0010] More preferably, it further includes a second bearing, which is arranged at both ends of the eccentric shaft to ensure stable rotation of the eccentric shaft.

[0011] Preferably, the connecting rod assembly includes a rod head, a rod body and a piston part, the rod head is rotationally connected to the eccentric shaft, the rod body is arranged between the rod head and the piston part, and the piston part is slidably connected in the pump chamber for transmitting piston movement.

[0012] More preferably, the pump chamber includes a piston chamber and a diaphragm, the diaphragm is disposed in the piston chamber, and the diaphragm is fixedly connected to the piston portion for changing the volume, thereby outputting pressurized fluid.

[0013] More preferably, the diaphragm is fixed in the middle of the piston part by screws, which is convenient for assembly.

[0014] Preferably, the pump body further comprises a reinforcement member, which is embedded on the inner wall of the pump body close to the driver and is located between the coupling and the connecting rod assembly to improve the stability of the moving parts in the pump body.

[0015] Preferably, the driver is detachably connected to the pump body, which facilitates replacement of the driver and reduces usage costs.

[0016] The beneficial effects of the utility model are:

[0017] (1) The silent pump is provided with a coupling between the driver and the eccentric shaft. The coupling can eliminate the eccentric motion transmitted from the driver and prevent the vibration generated by the driver from affecting the rotation of the eccentric shaft. A rubber coating is provided at the connection between the eccentric wheel and the eccentric shaft. The rubber coating absorbs the eccentric motion generated by the eccentric shaft, thereby reducing the noise of the entire pump during operation, making the sound generated by the pump within the natural frequency, and reducing the difficulty of eliminating the sound externally.

[0018] (2) The silent pump is provided with reinforcements to improve the working stability of the driver. The reinforcements separate the coupling and the connecting rod assembly to prevent the coupling from affecting the movement of the connecting rod assembly. In addition, ball bearings are provided at both ends of the eccentric shaft to improve the long-term rotation stability of the eccentric shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An axonometric diagram of the silent pump provided by the utility model;

[0020] Figure 2 A front view of the silent pump provided by the utility model;

[0021] Figure 3 for Figure 2 Section view along line AA;

[0022] Figure 4 This is a partial structural diagram of the silent pump provided by the utility model.

[0023] Reference numerals:

[0024] 1. Driver; 2. Pump body; 21. Eccentric wheel; 211. Rubber coating; 22. Coupling; 221. Diaphragm; 23. First bearing; 24. Eccentric shaft; 25. Second bearing; 26. Connecting rod assembly; 261. Rod body; 262. Piston; 263. Rod head; 27. Reinforcement; 28. Bracket; 3. Pump chamber; 31. Piston chamber; 32. Diaphragm; 4. Pump port. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Embodiment 1

[0027] like Figure 1-Figure 4 As shown, this embodiment discloses a silent pump, including a driver 1, a pump body 2 and a pump chamber 3, wherein the driver 1 is connected to one side of the pump body 2, and the pump chamber 3 is connected to the other side of the pump body 2, and the pump body 2 includes a coupling 22, an eccentric shaft 24, an eccentric wheel 21 and a connecting rod assembly 26, one end of the coupling 22 is connected to the driver 1, and the other end is connected to the eccentric shaft 24, and is used for the driver 1 to transmit power to the eccentric shaft 24, the eccentric wheel 21 is sleeved on the eccentric shaft 24 to form an eccentric structure, one end of the connecting rod assembly 26 is rotatably connected to the eccentric wheel 21, and the other end A piston moves in the pump chamber 3 to change the volume of the pump chamber 3, thereby outputting pressurized liquid. The eccentric wheel 21 includes a rubber layer 211, which is arranged on the inner wall where the eccentric wheel 21 contacts the connecting rod assembly 26. The rubber layer 211 can absorb the vibration between the connecting rod assembly 26 and the eccentric shaft 24. The vibration and deviation of each transmission part of the silent pump can be absorbed in turn through the coupling 22, the eccentric wheel 21 and the diaphragm 32, so that the running noise of the silent pump is reduced and the frequency of the generated noise is fixed, which is convenient for external noise reduction treatment of the silent pump.

[0028] Furthermore, the coupling 22 includes a plurality of diaphragms 221 , and two adjacent diaphragms 221 are flexibly connected. The plurality of diaphragms 221 are distributed axially to absorb radial runout tolerance, thereby preventing the vibration generated by the driver 1 from being transmitted to the eccentric shaft 24 .

[0029] Preferably, the rubber coating layer 211 is made of silica gel, and the rubber coating layer 211 and the eccentric wheel 21 are integrally formed, and have high bonding strength.

[0030] Preferably, it also includes a first bearing 23, the outer ring of the first bearing 23 abuts against the connecting rod assembly 26, and the inner ring of the first bearing 23 abuts against the eccentric wheel 21. The first bearing 23 can reduce the rotational resistance between the connecting rod assembly 26 and the eccentric wheel 21 and extend the service life.

[0031] More preferably, it further includes a second bearing 25 , which is disposed at both ends of the eccentric shaft 24 . The second bearing 25 is a double ball bearing, and both ends of the eccentric shaft 24 are fixedly supported, thereby ensuring the stability of the rotation of the eccentric shaft 24 .

[0032] Preferably, the connecting rod assembly 26 includes a rod head 263, a rod body 261 and a piston portion 262. The rod head 263 is rotatably connected to the eccentric shaft 24. The rod head 263 is provided with a groove connected to the first bearing 23. The rod body 261 is arranged between the rod head 263 and the piston portion 262. Changing the length of the rod body 261 can change the output capacity of a single piston movement. The piston portion 262 is slidably connected in the pump chamber 3, thereby improving the stability of the continuous connecting rod assembly 26 in piston movement.

[0033] Preferably, the pump chamber 3 includes a piston chamber 31 and a diaphragm 32 . The diaphragm 32 is disposed in the piston chamber 31 , and the diaphragm 32 is fixedly connected to the piston portion 262 . The diaphragm 32 is made of rubber.

[0034] More preferably, the diaphragm 32 is fixed in the middle of the piston part 262 by screws, one side of the diaphragm 32 abuts against the piston part 262, and the other side is provided with a pressing plate. The screws apply pressure to press the diaphragm 32 between the pressing plate and the piston part 262 to ensure the stability of the output pressure of the continuous movement of the diaphragm 32.

[0035] Furthermore, the pump body 2 also includes a reinforcement member 27, which is embedded in the inner wall of the pump body 2 close to the driver 1, and the reinforcement member 27 is between the coupling 22 and the connecting rod assembly 26. The end face of the reinforcement member 27 is hollowed out, and a through hole for installing the second bearing 25 is provided in the middle. The reinforcement member 27 provides an installation position for the second bearing 25 close to the driver; the two second bearings 25 clamp the eccentric wheel 21 in the middle to prevent the eccentric wheel 21 from loosening along the axial direction.

[0036] The working process of the silent pump is as follows:

[0037] The pump port 4 is connected to the external pipeline. When the silent pump power is turned on, the driver 1 rotates to drive the eccentric shaft 24 to rotate through the coupling 22. The eccentric shaft 24 drives the eccentric wheel 21 to rotate eccentrically. The eccentric wheel 21 drives the connecting rod assembly 26 to perform piston movement. The piston part 262 of the connecting rod assembly 26 repeatedly stretches and compresses the diaphragm 32. The reciprocating motion of the diaphragm 32 changes the volume of the piston chamber 31, thereby outputting pressure outward. The fluid in the piston chamber 31 flows outward through the pump port 4.

[0038] Embodiment 2

[0039] The present embodiment further discloses a silent pump, in which the driver 1 is detachably connected to the pump body 2, a bracket 28 is provided on the outer wall of the pump body 2 connected to the driver 1, and the driver 1 is connected to the bracket 28 by bolts, so as to facilitate disassembly and assembly after damage.

[0040] According to the disclosure and teaching of the above description, the technical personnel in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes of the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A silent pump, comprising a driver (1), a pump body (2) and a pump chamber (3), wherein the driver (1) is connected to one side of the pump body (2), and the pump chamber (3) is connected to the other side of the pump body (2), characterized in that: The pump body (2) comprises a coupling (22), an eccentric shaft (24), an eccentric wheel (21) and a connecting rod assembly (26); one end of the coupling (22) is connected to the driver (1), and the other end is connected to the eccentric shaft (24); the eccentric wheel (21) is sleeved on the eccentric shaft (24) to form an eccentric structure; one end of the connecting rod assembly (26) is rotatably connected to the eccentric wheel (21), and the other end performs piston motion in the pump chamber (3) to change the volume of the pump chamber (3); the eccentric wheel (21) comprises a rubber coating (211), and the rubber coating (211) is arranged on the inner wall of the eccentric wheel (21) in contact with the connecting rod assembly (26).

2. The silent pump according to claim 1, characterized in that: The coupling (22) comprises a plurality of diaphragms (221), and two adjacent diaphragms (221) are flexibly connected.

3. The silent pump according to claim 1, characterized in that: The rubber coating layer (211) is made of silica gel, and the rubber coating layer (211) and the eccentric wheel (21) are integrally formed.

4. The silent pump according to claim 3, characterized in that: It also includes a first bearing (23), the outer ring of the first bearing (23) abuts against the connecting rod assembly (26), and the inner ring of the first bearing (23) abuts against the eccentric wheel (21).

5. The silent pump according to claim 4, characterized in that: It also includes a second bearing (25), which is arranged at both ends of the eccentric shaft (24).

6. The silent pump according to claim 1, characterized in that: The connecting rod assembly (26) comprises a rod head (263), a rod body (261) and a piston part (262); the rod head (263) is rotatably connected to the eccentric shaft (24); the rod body (261) is arranged between the rod head (263) and the piston part (262); and the piston part (262) is slidably connected in the pump chamber (3).

7. The silent pump according to claim 6, characterized in that: The pump chamber (3) comprises a piston chamber (31) and a diaphragm (32); the diaphragm (32) is arranged in the piston chamber (31), and the diaphragm (32) is fixedly connected to the piston part (262).

8. The silent pump according to claim 7, characterized in that: The diaphragm (32) is fixed in the middle of the piston part (262) by screws.

9. The silent pump according to claim 1, characterized in that: The pump body (2) further comprises a reinforcing member (27), wherein the reinforcing member (27) is embedded in the inner wall of the pump body (2) close to the driver (1), and the reinforcing member (27) is located between the coupling (22) and the connecting rod assembly (26).

10. The silent pump according to any one of claims 1 to 9, characterized in that: The driver (1) is detachably connected to the pump body (2).

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