An air compressor

Abstract

The present invention discloses an air compressor, wherein an air compression component (10, 20) comprises a transmission component (140) arranged in a cylinder body (11) and connected to a drive component (30) and a compression component (141) respectively; a fan (15) arranged outside the transmission component (140) for heat dissipation; and an inner shell (40) extending inside the fan (15) and arranged between the side wall and the bottom plate of the cylinder body (11) to airtightly envelop the transmission component (140) and isolate the noise generated by it.

Description

Technical Field

[0001] The present application belongs to the technical field of air compressors, and in particular, relates to an air compressor. Background Art

[0002] At present, there are mainly two types of oil-free air compressors for oxygen concentrators on the market. One type of oil-free air compressor has connecting rod components, eccentric wheels, rotor bearings, and eccentric wheel bearings that are exposed to the atmosphere. When the oil-free air compressor is working, the connecting rod components, eccentric wheels, rotor bearings, and eccentric wheel bearings rotate at high speed. Therefore, the noise generated is relatively large. The other type of oil-free air compressor is a sealed shell that wraps the connecting rod components, eccentric wheels, rotor bearings, and eccentric wheel bearings inside the oil-free air compressor. The noise is reduced, but this structure cannot be equipped with fan blades, so the operating temperature is relatively high, which also leads to a significant drop in the temperature coefficient of the oil-free air compressor and low working efficiency of the oil-free air compressor.

[0003] In summary, existing air compressors have the defects of relatively loud noise during operation and poor heat dissipation of the drive component (usually the motor). Summary of the invention

[0004] The present application provides an air compressor, comprising: a driving component, both ends of which are respectively connected to two symmetrically arranged air compression components to drive the two components to work; wherein any one of the air compression components comprises: a cylinder body; a transmission component, which is arranged in the cylinder body and is respectively connected to the driving component and the compression component, and is used to transmit the power output by the driving component to the compression component to work; the compression component, which reciprocates under the drive of the transmission component; a fan, which is arranged on the outside of the transmission component and is used to dissipate heat inside the cylinder body; and an inner shell, which is extended and arranged on the inside of the fan between the side wall and the bottom plate of the cylinder body to air-tightly envelop the transmission component; wherein the distance between the side wall of the inner shell and the fan is at least greater than 1 / 2 of the distance between the fan and the transmission component.

[0005] Furthermore, the distance between the side wall of the inner shell and the end surface formed by the rotation of the transmission assembly is between 0.5-2 mm.

[0006] Further, the inner shell extends and is connected between the side wall and the bottom plate of the cylinder body.

[0007] Furthermore, the portion of the inner shell below the transmission assembly extends toward the drive assembly to form a bottom plate, so that a transverse air duct for heat dissipation is formed between the bottom plate of the inner shell and the bottom plate of the cylinder body.

[0008] Furthermore, the bottom plate of the inner shell extends toward the driving assembly and is connected to the inner side wall of the cylinder body, and the lower portion of the inner side wall of the cylinder body has an opening so that the transverse air duct is connected to the driving assembly.

[0009] Furthermore, the transmission assembly includes an eccentric wheel assembly and a connecting rod, and the rotation radius of the eccentric wheel assembly is reduced to within 60% of the outer shell radius of the driving assembly.

[0010] Furthermore, a gap between an outer peripheral edge of the rotating surface of the eccentric wheel assembly and the inner shell is greater than or equal to 0.5 mm.

[0011] Furthermore, the spacing of the transverse air duct between the bottom plate of the inner shell and the bottom plate of the cylinder body is between 3-30 mm.

[0012] Furthermore, an arc transition portion is provided between the side wall and the bottom plate of the inner shell, and the arc radius is at least 1 mm.

[0013] Furthermore, a plurality of ventilation holes are provided on a side of the cylinder body close to the driving assembly.

[0014] Further, the driving component is a motor, and the transverse air duct extends to the stator and / or rotor of the motor;

[0015] A stepped connection portion with an inner chamfer is formed between the bottom plate of the inner shell and the inner wall of the cylinder body, so that a heat dissipation chamber is formed between the stepped connection portion and the inner wall of the cylinder body to accommodate the stator or rotor of the motor exposed in the heat dissipation chamber.

[0016] The inner shell is provided with a plurality of ribs, one end of the ribs is connected to the outer wall surface of the inner shell, and the other end is connected to the inner wall of the cylinder body.

[0017] The above technical solution of the present invention has at least the following beneficial technical effects:

[0018] In the present application, the inner shell extends inside the fan and is disposed between the side wall and the bottom plate of the cylinder body to airtightly envelop the transmission assembly, so that the noise of the movement of the transmission assembly and the compression assembly is not easily transmitted to the outside, thereby reducing the noise. At the same time, since the overall size of the transmission assembly is reduced, the distance between the side wall of the inner shell and the transmission assembly is set smaller, and correspondingly, the distance between the inner shell and the fan can be set larger. In this way, without affecting the original size of the air compressor, the transmission assembly and the drive assembly enveloping the inner shell have a larger heat dissipation area and heat dissipation channel, and the heat generated by them is dissipated faster through the fan, resulting in a better heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a front cross-sectional view of an air compressor in one embodiment of the present application.

[0021] Figure 2 It is a three-dimensional diagram of an air compressor in one embodiment of the present application.

[0022] Figure 3 It is a partial front cross-sectional view of an air compressor in one embodiment of the present application.

[0023] Figure 4 It is a left view of a cylinder body in one embodiment of the present application.

[0024] Figure 5 It is a top view of a cylinder body in one embodiment of the present application.

[0025] Figure 6 It is a three-dimensional diagram of a cylinder body in one embodiment of the present application.

[0026] Figure 7 It is a three-dimensional diagram of a cylinder body in one embodiment of the present application.

[0027] in, Figures 1 to 7 The corresponding relationship between the reference numerals and component names in the figure is:

[0028] 10 / 20, air compression assembly; 11, cylinder body; 13, first sealed bearing; 140, transmission assembly; 1400, connecting rod; 1401, third bearing; 1402, eccentric wheel assembly; 141, compression assembly; 15, fan; 16, second sealed bearing; 17, air duct; 206, step connection; 207, ribs; 210, ventilation holes;

[0029] 30. Drive assembly; 301. Output shaft; 31. Rotor; 32. Stator; 40. Inner housing. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined with each other and quoted from each other without contradiction.

[0031] At present, the existing air compressor has the problem of relatively loud noise during operation and poor heat dissipation of the drive assembly 30 .

[0032] To solve the above problems, Figure 1-3 As shown, an embodiment of the present application discloses an air compressor, comprising:

[0033] The driving component 30 has its two ends connected to two symmetrically arranged air compression components 10 / 20 to drive the two to work; the driving component 30 and the two air compression components 10 / 20 are usually placed horizontally, that is, the two air compression components 10 / 20 are located on the left and right sides of the driving component 30, and the driving component 30 acts as a power source to simultaneously drive the two air compression components 10 / 20 to perform compression work.

[0034] Among them, any one of the air compression components 10 / 20 includes a cylinder body 11 , a transmission component 140 , a compression component 141 , a fan 15 , and an inner shell 40 arranged inside the cylinder body 11 .

[0035] The transmission assembly 140 is installed in the cylinder body 11, and is connected to the drive assembly 30 and the compression assembly 141 respectively, and is used to transmit the power output by the drive assembly 30 to the compression assembly 141 to work;

[0036] The compression assembly 141 performs reciprocating motion driven by the transmission assembly 140 ; ​​the reciprocating motion of the compression assembly 141 can be used for air compression.

[0037] The fan 15 is arranged outside the transmission assembly 140 to dissipate heat inside the cylinder body 11;

[0038] like Figure 4 , 5 As shown in FIGS. 6 and 7 , the inner housing 40 is extended inside the fan 15 and disposed between the side wall and the bottom plate of the cylinder body 11 to airtightly envelop the transmission assembly 140, so that the noise generated by the movement of the transmission assembly 140 and the compression assembly 141 is not easily transmitted to the outside, thereby reducing the noise.

[0039] The distance between the side wall of the inner housing 40 and the fan 15 is at least greater than 1 / 2 of the distance between the fan 15 and the transmission assembly 140. In the preferred embodiment of the present application, the size of the distance can preferably be achieved by reducing the overall size of the transmission assembly, which makes the distance between the side wall of the inner housing 40 and the transmission assembly smaller, and correspondingly, the distance between the side wall of the inner housing 40 and the fan 15 can be set larger. In this way, without affecting the original size of the air compressor, the transmission assembly 140 and the drive assembly enclosed by the inner housing 40 have a larger heat dissipation area and heat dissipation channel, and the heat generated by them is dissipated faster through the fan 15, and the heat dissipation effect is better.

[0040] Embodiment 1

[0041] In this embodiment, the distance between the side wall of the inner housing 40 and the end surface formed by the rotation of the transmission assembly 140 is between 0.5-2 mm, so that the space occupied by the inner housing 40 is smaller.

[0042] The inner housing 40 is extended and connected between the side wall and the bottom plate of the cylinder body 11 .

[0043] Preferably, the portion of the inner shell 40 below the transmission assembly 140 extends toward the bottom of the drive assembly 30 to form a bottom plate, so that a transverse air duct 17 for heat dissipation is formed between the bottom plate of the inner shell 40 and the bottom plate of the cylinder body 11. The extended air duct 17 expands the heat dissipation space and increases the heat dissipation effect of the transmission assembly 140 and the drive assembly 30.

[0044] Preferably, the bottom plate of the inner housing 40 extends upward toward the driving assembly 30 and is connected to the inner side wall of the cylinder body 11, and the lower part of the inner side wall of the cylinder body 11 has an opening so that the transverse air duct 17 is connected to the driving assembly 30. The heat dissipation transverse air duct 17 is further connected to the driving assembly 30, so that the driving assembly 30 is directly exposed to the airflow of the air duct 17, which increases the heat dissipation area and enhances the heat dissipation effect.

[0045] Preferably, an air duct 17 is formed between the inner shell 40 and the cylinder body 11, wherein the side wall and the bottom plate of the inner shell 40 have gaps with the inner wall of the cylinder body 11, respectively forming a vertical air duct 17 and a horizontal air duct 17, and the air duct 17 is finally connected to the chamber where the drive assembly 30 is located by ribs 207 arranged between the inner shell 40 and the cylinder body 11. The inner shell 40 is provided with a plurality of ribs 207, one end of the rib 207 is connected to the outer wall surface of the inner shell 40, and the other end is connected to the inner wall of the cylinder body 11.

[0046] Specifically, the left and right sides of the lower end of the cylinder body 11 have a first opening and a second opening respectively; the fan 15 is installed in the first opening; the drive assembly 30 is installed on the second opening side, and the drive assembly 30 is fixedly connected to the second opening and is detachable. The inner shell 40 is located inside the lower end of the cylinder body 11, and a first through hole is provided on a side of the inner shell 40 adjacent to the first opening, and a second through hole is provided on a side of the inner shell 40 adjacent to the second opening, the first sealed bearing 13 is provided in the first through hole, and the second sealed bearing 16 is provided in the second through hole;

[0047] The output shaft 301 of the driving assembly 30 first passes through the second through hole to connect and drive the transmission assembly 140, and then passes through the first through hole to connect and drive the fan 15. The first through hole, the first sealed bearing 13 and the output shaft 301, as well as the first through hole, the first sealed bearing 13 and the output shaft 301 are all sealed connections, so that the inner housing 40 and the upper part of the cylinder body 11 together form an airtight chamber; the airtight chamber makes it difficult for the sound generated by the movement of the transmission assembly 140 in the inner housing 40 to be transmitted to the outside, that is, the noise is reduced.

[0048] Embodiment 2

[0049] In order to obtain sufficient deflection force, the rotation radius of the eccentric wheel of a conventional air compressor is usually set at least 80% of the outer shell radius of the drive assembly 30, close to or equal to the outer shell radius, which causes problems such as high noise, high energy consumption, and high heat generation, and there is no space for setting an airtight inner shell 40. In this embodiment, the transmission assembly 140 includes an eccentric wheel assembly 1402 and a connecting rod 1400, and the rotation radius of the eccentric wheel assembly 1402 is set within 60% of the outer shell radius of the drive assembly 30.

[0050] Furthermore, the gap between the outer peripheral edge of the rotating surface of the eccentric wheel assembly 1402 and the inner shell 40 is greater than or equal to 0.5 mm; this size limitation can be achieved by changing the center of gravity or shape of the counterweight, that is, reducing the rotation radius of the eccentric wheel assembly 1402 (mainly the counterweight) and expanding the size of the transverse air duct 17.

[0051] The smaller the distance between the side wall of the inner housing 40 and the end surface formed by the rotation of the eccentric wheel assembly 1402, the better, preferably 0.5-2 mm.

[0052] The circle formed with the rotation center of the output shaft 301 as the center and a radius of R (the maximum distance from the center of the eccentric assembly 1402 for assembling the output shaft 301 to the edge of the eccentric assembly 1402) is the sector rotation area; R is the rotation radius.

[0053] The outer contour of the rotating area is at a distance X from the inner shell 40. The smaller the distance X, the better, generally in the range of 0.5 to 1.5 mm, to prevent the cumulative tolerance caused by processing, manufacturing, assembly and other links from making X < 0, that is, the eccentric wheel assembly 1402 interferes with the inner shell 40 (collides with each other) and cannot rotate.

[0054] Preferably, the spacing of the air duct 17 between the bottom plate of the inner shell 40 and the bottom plate of the cylinder body 11 is at least greater than 3 mm. The larger the cross-sectional area of ​​the heat dissipation air duct 17, the greater the ventilation volume, and the better the heat dissipation effect on the drive assembly 30. It should be noted that this size does not include the size of the position where the inner shell 40 is directly connected to the cylinder body 11.

[0055] Preferably, the distance between the bottom plate of the inner shell 40 and the bottom plate of the cylinder body 11 is between 3-30 mm, and the most preferred is 10 mm. The larger the distance, the better, but the inner wall diameter of the cylinder body 11 is not greater than the outer shell diameter of the drive assembly 30.

[0056] The outer wall surface of the inner shell 40 on one side close to the fan 15 is a curved surface that smoothly transitions from the center to the surrounding area, and / or the edge of the outer wall surface is provided with an outer chamfer that is greater than or equal to 1m and is streamlined, which is conducive to wind entering the heat dissipation duct 17 and dissipating heat for the drive component 30.

[0057] Preferably, an arc transition portion is provided between the side wall and the bottom plate of the inner shell 40, and the arc radius is at least 1 mm.

[0058] Embodiment 4

[0059] like Figure 2 and 6 As shown, a plurality of ventilation holes 210 are provided on the cylinder body 11 near the driving assembly 30 ; the hot air formed by the wind from the air duct 17 blowing onto the inner shell 40 or the driving assembly 30 is dissipated to the external space of the air compressor through the ventilation holes 210 .

[0060] Optionally, a plurality of ventilation holes 210 are arranged along the outer periphery of the cylinder body 11 on one side close to the driving assembly 30 , the number of the ventilation holes 210 corresponds to the number of the ribs 207 , and the ventilation holes 210 are distributed at staggered intervals with the ribs 207 .

[0061] Optionally, the fan 15 can blow air toward the inner shell 40 and the air duct 17 , or can rotate in the opposite direction so that the wind is sucked in from the ventilation holes 210 and then flows through the drive assembly 30 , the air duct 17 , the inner shell 40 , etc., and finally blown out from the fan 15 .

[0062] Embodiment 5

[0063] In this embodiment, Figure 3As shown, the upper part of the air compression component 10 / 20 is a cylinder, and the driving component 30 is a motor; the lower part of the outer shell of the cylinder is the cylinder body 11 in the above embodiment, the transmission component 140 includes a connecting rod 1400 and an eccentric wheel component 1402, and the compression component 141 is a piston; the left and right sides of the cylinder body 11 are respectively provided with a first through hole and a second through hole, and a first sealed bearing 13 and a second sealed bearing 16 are installed inside; the output shaft 301 of the driving component 30 first passes through the second through hole to connect and can drive the connecting rod 1400, wherein the eccentric wheel component 1402 It is fixedly mounted on the output shaft 301, and is movably connected to the connecting rod 1400 via the third bearing 1401 or the bearing shell; it then passes through the first through hole, connects to and drives the fan 15, and the first through hole, the first sealed bearing 13 and the output shaft 301, as well as the second through hole, the second sealed bearing 16 and the output shaft 301 are all sealed connections, so that the inner housing 40 and the upper part of the cylinder body 11 together form an airtight chamber; the sound generated by the movement of the connecting rod 1400 in the inner housing 40 and the piston in the cylinder body 11 is not easily transmitted to the outside, that is, the noise is reduced.

[0064] The air duct 17 is connected to the rotor 31 and stator 32 of the motor, which is more conducive to heat dissipation. Preferably, there is an outer chamfer between the side wall and the bottom plate of the inner housing 40, facing the fan 15; the bottom plate of the inner housing 40 has a stepped connection portion 206 on the side close to the drive assembly 30, and the stepped connection portion 206 is fixedly connected between the bottom edge of the inner housing 40 and the inner wall of the cylinder body 11. Preferably, the stepped connection portion 206 has an inner chamfer, so that a heat dissipation chamber as large as possible is formed between the stepped connection portion 206 and the inner wall of the cylinder body 11 to accommodate the end of the stator 32 of the motor (if the coil is on the stator 32, it is the coil on the stator 32), and there is a gap with the end of the stator 32; the gap at the position of the stepped connection portion 206 can allow wind to pass through, and its position is close to the gap between the stator 32 and the rotor 31, which is more conducive to heat dissipation for the stator 32 and rotor 31 of the motor.

[0065] Preferably, in the case where the rotor 31 is inside and the stator 32 is outside and surrounds the rotor 31 , the rotation radius of the eccentric wheel assembly 1402 is set within 60% of the contour radius of the stator 32 .

[0066] In another optional embodiment, in the case where the rotor 31 is outside and the stator 32 is inside, and the rotor 31 surrounds the stator 32, the rotation radius of the eccentric wheel assembly 1402 is set within 60% of the contour radius of the rotor 31. In this case, the transverse heat dissipation duct 17 can extend and connect to a part or all of the rotor 31, or even a part of the stator 32.

[0067] In the description of the present invention, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] It should be understood that the above specific embodiments of the present application are only used to illustrate or explain the principles of the present application, and do not constitute a limitation to the present application. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present application should be included in the protection scope of the present application. In addition, the claims attached to the present application are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. An air compressor, characterized in that: include: A driving component (30), two ends of which are respectively connected to two symmetrically arranged air compression components (10, 20) to drive the two components to work; Wherein, any one of the air compression components (10, 20) comprises: Cylinder body (11); A transmission assembly (140) is disposed in the cylinder body (11), and is connected to the drive assembly (30) and the compression assembly (141) respectively, and is used to transmit the power output by the drive assembly (30) to the compression assembly (141) for operation; A compression assembly (141) performs reciprocating motion driven by the transmission assembly (140); a fan (15), arranged outside the transmission assembly (140) and used for dissipating heat inside the cylinder body (11); and An inner casing (40) is extended inside the fan (15) and arranged between the side wall and the bottom plate of the cylinder body (11) to airtightly envelop the transmission assembly (140); Wherein, the distance between the side wall of the inner shell (40) and the fan (15) is at least greater than 1 / 2 of the distance between the fan (15) and the transmission assembly (140).

2. The air compressor according to claim 1, characterized in that: The distance between the side wall of the inner shell (40) and the end surface formed by the rotation of the transmission assembly (140) is between 0.5-2 mm.

3. The air compressor according to claim 1 or 2, characterized in that: The inner housing (40) is extended and connected between the side wall and the bottom plate of the cylinder body (11).

4. The air compressor according to claim 1 or 2, characterized in that: The portion of the inner shell (40) below the transmission assembly (140) extends toward the drive assembly (30) to form a bottom plate, so that a transverse air duct (17) for heat dissipation is formed between the bottom plate of the inner shell (40) and the bottom plate of the cylinder body (11).

5. The air compressor according to claim 4, characterized in that: The bottom plate of the inner shell (40) extends toward the driving assembly (30) and is connected to the inner wall of the cylinder body (11); the lower portion of the inner wall of the cylinder body (11) has an opening so that the transverse air duct (17) is connected to the driving assembly (30).

6. The air compressor according to any one of claims 1 to 5, characterized in that: The transmission assembly (140) comprises an eccentric assembly (1402) and a connecting rod (1400), and the rotation radius of the eccentric assembly (1402) is set within 60% of the outer shell radius of the driving assembly (30).

7. The air compressor according to claim 6, characterized in that: The gap between the outer peripheral edge of the rotating surface of the eccentric wheel assembly (1402) and the inner shell (40) is greater than or equal to 0.5 mm.

8. The air compressor according to any one of claims 1 to 7, characterized in that: The spacing between the bottom plate of the inner shell (40) and the bottom plate of the cylinder body (11) and the transverse air duct (17) is between 3 and 30 mm.

9. The air compressor according to any one of claims 1 to 8, characterized in that: An arc transition portion is provided between the side wall and the bottom plate of the inner shell (40), and the arc radius is at least 1 mm.

10. The air compressor according to claim 1, characterized in that A plurality of ventilation holes (210) are provided on a side of the cylinder body (11) close to the driving assembly (30).

11. The air compressor according to any one of claims 3 to 10, characterized in that: The driving assembly (30) is a motor, and the transverse air duct (17) extends to the stator (32) and / or the rotor (31) of the motor.

12. The air compressor according to claim 11, characterized in that: A stepped connection portion (206) with an inner chamfer is formed on the bottom plate of the inner housing 40 near the side of the drive assembly (30), so that a heat dissipation chamber is formed between the stepped connection portion (206) and the inner wall of the cylinder body (11) to accommodate the stator (32) or rotor (31) of the motor exposed in the heat dissipation chamber.

13. The air compressor according to any one of claims 1 to 11, characterized in that: The inner shell (40) is provided with a plurality of ribs (207), one end of the rib (207) is connected to the outer wall surface of the inner shell (40), and the other end is connected to the inner wall of the cylinder (11).

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