Low-noise oil-free brushless compressor

Abstract

The utility model discloses a low-noise oil-free brushless compressor which comprises a motor and two compression pump shells, the two compression pump shells are located on the two sides of the motor respectively and provided with silencing cavities, pump body assemblies are arranged in the silencing cavities, the motor is a double-output-shaft motor, and output shafts at the two ends penetrate into the silencing cavities of the two compression pump shells respectively. The motor output shaft is connected with the pump body assembly in the silencing cavity, and a bearing is arranged at the penetrating position of the motor output shaft in a sleeved mode and filled with lubricating grease. A double-output-shaft brushless direct-current motor is adopted in the motor, the silencing cavity is formed in the compression pump shell, the output shaft of the motor penetrates into the silencing cavity to be connected with the pump body assembly, the bearing is arranged at the penetrating position, the bearing is coated with the lubricating grease, the silencing cavity can be sealed through the lubricating grease, a closed space is formed in the silencing cavity, and therefore the silencing effect is improved. And meanwhile, the rotating effect of the bearing and the output end of the motor can be improved through the lubricating grease, so that the vibration feeling is reduced, and it is ensured that the compressor works more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a low-noise oil-free brushless compressor. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. The structure of a compressor is similar to that of a water pump. Most compressors are reciprocating piston type, rotating blade or rotating screw. The compressor is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover (usually a motor) into gas pressure energy. It is a compressed air pressure generating device.

[0003] Since the pump body assembly in the compressor is connected to the motor rotor assembly and the compressor housing assembly, when the pump body assembly is working, it receives a large amount of energy emitted by the motor and transmitted to the housing. Therefore, its own mode is excited, and the generated vibration has strong transmission properties and radiates outward through the gas channel, thereby causing a large noise problem. Therefore, in view of this, the structure of the compressor needs to be improved to reduce the noise of the compressor. Utility Model Content

[0004] The utility model aims to provide a low-noise oil-free brushless compressor with good stability and reduced noise.

[0005] In order to solve the above technical problems, the present invention can be implemented by adopting the following technical solutions:

[0006] A low-noise oil-free brushless compressor comprises a motor and two groups of compression pump housings, the two groups of compression pump housings are respectively located on both sides of the motor, and the two groups of compression pump housings have a silencer cavity, a pump body assembly is arranged in the silencer cavity, the motor is a double-shaft motor, the output shafts at both ends of the motor respectively penetrate into the silencer cavities of the two groups of compression pump housings, and are connected to the pump body assembly in the silencer cavity, a bearing is sleeved at the penetration point of the motor output shaft, and sound insulation covers are arranged on both sides of the bearing, and grease is filled in the ball gap of the bearing.

[0007] In one embodiment, the compression pump housing includes a main shell, a side cover and a top cover. One side of the main shell is connected to the motor, and the bearing is installed on the side wall of this side. The other side of the main shell is sealed with the side cover, and the top cover is sealed on the top of the main shell, thereby forming a closed space in the muffler chamber.

[0008] In one embodiment, the pump body assembly includes a connecting rod, a piston and an upper chamber cover. One end of the connecting rod is connected to the output shaft of the motor through an eccentric cam, and the other end is connected to the piston. The upper chamber cover is located on the top of the main shell and is pressed by the top cover. The motor drives the eccentric cam to rotate, thereby moving the piston up and down through the connecting rod.

[0009] In one of the embodiments, an air inlet connected to the muffler chamber is provided at the bottom of the main shell, an air inlet nozzle connected to the muffler chamber is installed on the side cover, and an air outlet nozzle connected to the muffler chamber is provided on the top cover.

[0010] In one embodiment, the piston and the upper chamber cover are both provided with air holes, and a one-way valve sheet is provided at the air hole.

[0011] In one of the embodiments, the air outlet nozzles of the top covers of the compression pump housing on both sides are connected by a three-way hose.

[0012] In one embodiment, the top of the top cover has heat dissipation fins.

[0013] In one of the embodiments, the upper side wall of the main shell is provided with heat dissipation ribs.

[0014] In one embodiment, the motor has a support ring, and the main shells of the compression pump housings on both sides are respectively interference-connected with the two sides of the support ring.

[0015] In one embodiment, the motor is a brushless DC motor. Beneficial Effects

[0016] The utility model discloses a low-noise oil-free brushless compressor, the motor adopts a double-output shaft brushless DC motor, and a silencer cavity is arranged in the compression pump housing, the pump body assembly is arranged in the silencer cavity, and the output shaft of the motor penetrates into the silencer cavity of the compression pump housing to be connected with the pump body assembly, and a bearing is arranged at the penetration position of the output shaft, and grease is coated on the bearing, the silencer cavity can be sealed by the grease, so that the silencer cavity forms a closed space, and the sealed silencer cavity effectively reduces noise, and the grease can also improve the effect of the bearing and the motor output end when rotating, thereby reducing the vibration and ensuring that the compressor is more stable when working. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the low-noise oil-free brushless compressor of the utility model;

[0018] Figure 2 This is an exploded view of one side of the low-noise oil-free brushless compressor of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the utility model low-noise oil-free brushless compressor;

[0020] Figure 4 This is a schematic diagram of the pump assembly structure of the utility model low-noise oil-free brushless compressor;

[0021] Figure 5 The utility model is a schematic diagram of the motor structure of the low-noise oil-free brushless compressor.

[0022] As shown in the attached figure:

[0023] 100, motor; 110, output shaft; 120, bracket ring;

[0024] 200, compression pump housing; 210, main housing; 211, air inlet; 212, heat dissipation ribs; 220, side cover; 221, air inlet nozzle; 230, top cover; 231, air outlet nozzle; 232, heat dissipation fins;

[0025] 300, anechoic chamber;

[0026] 400, pump body assembly; 410, connecting rod; 420, piston; 430, upper chamber cover; 440, eccentric cam; 450, air hole; 460, one-way valve plate;

[0027] 500, bearing; 510, silencer cover;

[0028] 600, three-way hose. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] See also Figures 1 to 3A low-noise oil-free brushless compressor comprises a motor 100 and two groups of compression pump housings 200, the two groups of compression pump housings 200 are respectively located on both sides of the motor 100, and the two groups of compression pump housings 200 have a muffler cavity 300, a pump body assembly 400 is arranged in the muffler cavity 300, the motor 100 is a double-shaft motor, and the output shafts 110 at both ends thereof respectively penetrate into the muffler cavity 300 of the two groups of compression pump housings 200, and are connected to the pump body assembly 400 in the muffler cavity 300, a bearing 500 is sleeved at the penetration of the output shaft 110 of the motor 100, and sound insulation covers 510 are arranged on both sides of the bearing 500, and grease is filled in the ball gap of the bearing 500.

[0033] Specifically, in this embodiment, the motor 100 adopts a double-shaft motor, and a compression pump housing 200 is respectively arranged on both sides of the motor 100. A silencer chamber 300 is arranged in the compression pump housing 200. The pump body assembly 400 is arranged in the silencer chamber 300 and connected to the output shaft 110 of the motor 100. When the motor 100 is running, the pump body assembly 400 is driven to work, thereby realizing air compression. In order to ensure that the motor 100 can drive the pump body assembly 400 to work more smoothly, a bearing 500 is provided at the place where the output shaft 110 of the motor 100 penetrates into the compression pump housing 200. The bearing 500 is a ball bearing. The bearing 500 can improve the rotation effect of the output shaft 110 of the motor 100, thereby reducing the vibration. At the same time, sound insulation covers 510 are provided on both sides of the bearing 500. The sound insulation covers 510 on both sides of the bearing 500 block the air on both sides, and the ball gap of the bearing 500 is filled with grease. Because the grease is thick Grease-like semi-solids can be used for the friction part of the machine, so as to play a good role in lubricating and sealing the bearing 500. By lubricating the bearing 500, the rotation effect of the output shaft 110 of the motor 100 can be better ensured, thereby improving the stability of the compressor during operation and reducing vibration. In addition, the sound insulation cover 510 on both sides of the bearing 500 and the grease filled inside are used to seal the silencer chamber 300, so that the noise generated by the pump body assembly 400 during operation can be effectively eliminated by the silencer chamber 300, thereby achieving noise reduction of the compressor and improving the noise reduction effect.

[0034] Of course, in order to better perform noise reduction processing, the motor 100 in this embodiment adopts a double-shaft brushless DC motor. Since the mechanical noise of the brushless motor itself is relatively low, combined with the silencer cavity 300, the silencer cover 510 on both sides of the bearing 500 and the grease filled inside the bearing 500, the overall noise reduction effect of the compressor can be better improved.

[0035] See also Figure 2In order to form a silencer chamber 300 in the compression pump housing 200 and to seal the silencer chamber 300, the compression pump housing 200 in this embodiment includes a main housing 210, a side cover 220 and a top cover 230. One side of the main housing 210 is connected to the motor 100, and the bearing 500 is installed on the side wall of this side. The other side of the main housing 210 is sealed with the side cover 220, and the top cover 230 is sealed on the top of the main housing 210. The silencer chamber 300 is formed inside the main housing 210 through the side cover 220, the top cover 230 and the bearing 500, and the silencer chamber 300 is formed into a closed space through the sealing of the side cover 220, the sealing of the top cover 230 and the filling of grease in the bearing 500, thereby realizing the noise reduction function through the sealed silencer chamber 300.

[0036] See also Figures 2 to 5 In order to achieve air compression, the compressor in this embodiment has a pump body assembly 400 including a connecting rod 410, a piston 420 and an upper chamber cover 430. One end of the connecting rod 410 is connected to the output shaft 110 of the motor 100 through an eccentric cam 440, and the other end is connected to the piston 420. The upper chamber cover 430 is located at the top of the main shell 210 and is pressed by the top cover 230. The motor 100 drives the eccentric cam 440 to rotate, thereby moving the piston 420 up and down through the connecting rod 410. At the same time, an air inlet 211 communicating with the muffler chamber 300 is provided at the bottom of the main shell 210, an air inlet nozzle 221 communicating with the muffler chamber 300 is installed on the side cover 220, and an air outlet nozzle 231 communicating with the muffler chamber 300 is provided on the top cover 230. In addition, air holes 450 are provided in the piston 420 and the upper chamber cover 430, and a one-way valve plate 460 is provided at the air hole 450.

[0037] When the compressor is working, the output shaft 110 of the motor 100 drives the eccentric cam 440 to rotate. When the eccentric cam 440 rotates, it drives the connecting rod 410 to move up and down. Since the piston 420 is connected to the connecting rod 410, the piston 420 moves up and down with the connecting rod 410, and the air enters the muffler chamber 300 of the compression pump housing 200 from the air inlet 211 and / or the air inlet nozzle 221. When the motor 100 drives the piston 420 to move downward, the single piston 420 on the piston 420 moves upward and downward. When the one-way valve plate 460 is opened and the one-way valve plate 460 of the upper chamber cover 430 is closed, the gas flows from the air hole 450 of the piston 420 and flows between the piston 420 and the upper chamber cover 430; when the motor 100 drives the piston 420 to move upward, the one-way valve plate 460 of the piston 420 is closed, and the one-way valve plate 460 of the upper chamber cover 430 is opened, and the gas is squeezed by the piston 420, flows from the air hole 450 of the upper chamber cover 430, and is discharged from the air outlet nozzle 231, thereby realizing the compression of the gas.

[0038] At the same time, the air inlet nozzle 221 and the air inlet port 211 can be flexibly selected according to usage requirements. For example, when only the air inlet nozzle 221 is needed, the air inlet port 211 can be closed with a head, and vice versa. The air inlet port 211 is arranged at the bottom of the compression pump housing 200, which can also effectively reduce the intake noise of the air inlet port 211.

[0039] In order to connect the motor 100 with the compression pump housings 200 on both sides, the motor 100 is provided with a bracket ring 120, and the main shells 210 of the compression pump housings 200 on both sides are respectively interference-connected with the two sides of the bracket ring 120. The interference connection can facilitate the connection between the compression pump housing 200 and the motor 100, and facilitate subsequent disassembly and assembly.

[0040] In addition, in order to make the compressor adaptable to different occasions, the top cover 230 of the compression pump housing 200 on both sides and the air outlet nozzle 231 are connected by a three-way hose 600, and the two air outlet nozzles 231 are connected by the three-way hose 600 to converge, so as to facilitate the setting and assembly of the compressor, so that the compressor can cope with different occasions and improve the practical performance of the compressor.

[0041] Finally, see Figure 2 Since the compressor generates heat when it is running, in order to ensure the service life of the compressor, in this embodiment, the top of the top cover 230 has a heat dissipation fin 232, and the upper side wall of the main shell 210 is provided with a heat dissipation rib 212. The heat dissipation fin 232 and the heat dissipation rib 212 can greatly improve the heat dissipation effect, thereby dissipating the heat generated when the compressor is running, thereby ensuring the service life of the compressor.

[0042] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Any technician in the industry can smoothly implement the utility model according to the drawings shown in the specification and the above description; however, any equivalent changes, modifications and evolutions made by any technician familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the scope of protection of the technical solution of the utility model.

Claims

1. A low-noise oil-free brushless compressor, characterized in that: It includes a motor and two sets of compression pump housings, the two sets of compression pump housings are respectively located on both sides of the motor, and the two sets of compression pump housings have a muffler cavity, and a pump body assembly is arranged in the muffler cavity; The motor is a double-shaft motor, and the output shafts at both ends of the motor respectively penetrate into the silencer chambers of the two sets of compression pump casings and are connected to the pump body assembly in the silencer chamber. Bearings are sleeved at the penetration points of the motor output shafts, and sound insulation covers are provided on both sides of the bearings, and grease is filled inside the ball gap of the bearings.

2. The low-noise oil-free brushless compressor according to claim 1, characterized in that: The compression pump housing includes a main housing, a side cover and a top cover. One side of the main housing is connected to the motor, and the bearing is installed on the side wall of this side. The other side of the main housing is sealed with the side cover, and the top cover is sealed on the top of the main housing, thereby forming a closed space in the muffler chamber.

3. The low-noise oil-free brushless compressor according to claim 2, characterized in that: The pump body assembly includes a connecting rod, a piston and an upper chamber cover. One end of the connecting rod is connected to the output shaft of the motor through an eccentric cam, and the other end is connected to the piston. The upper chamber cover is located on the top of the main shell and is pressed by the top cover. The motor drives the eccentric cam to rotate, thereby moving the piston up and down through the connecting rod.

4. The low-noise oil-free brushless compressor according to claim 3, characterized in that: The bottom of the main shell is provided with an air inlet connected to the muffler chamber, the side cover is provided with an air inlet nozzle connected to the muffler chamber, and the top cover is provided with an air outlet nozzle connected to the muffler chamber.

5. The low-noise oil-free brushless compressor according to claim 4, characterized in that: The piston and the upper cavity cover are both provided with air holes, and a one-way valve sheet is arranged at the air hole.

6. The low-noise oil-free brushless compressor according to claim 4, characterized in that: The air outlet nozzles of the top covers of the compression pump housings on both sides are connected via three-way hoses.

7. The low-noise oil-free brushless compressor according to claim 2, characterized in that: The top of the top cover is provided with heat dissipation fins.

8. The low-noise oil-free brushless compressor according to claim 2, characterized in that: The upper side wall of the main shell is provided with heat dissipation ribs.

9. The low-noise oil-free brushless compressor according to claim 2, characterized in that: The motor has a support ring, and main shells of compression pump housings on both sides are respectively connected with both sides of the support ring in interference connection.

10. The low-noise oil-free brushless compressor according to claim 1, characterized in that: The motor is a brushless DC motor.

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