Eccentric crankshaft with cooling structure and reciprocating air compressor

Abstract

The application relates to the field of air compressors, and relates to an eccentric crankshaft with a cooling structure and a reciprocating air compressor. The eccentric crankshaft with the cooling structure is internally provided with an air duct, the eccentric shaft body surface is provided with a plurality of air inlets, the air inlets are communicated with the air duct; the eccentric shaft body surface is provided with a fan, the eccentric shaft body surface is provided with a plurality of air outlets corresponding to the fan, the air outlets are communicated with the air duct; the fan is relatively fixed with the eccentric shaft body, the fan can generate negative pressure when rotating with the eccentric shaft body, an air flow path flowing from the air inlets to the air outlets is formed, and the heat in the eccentric shaft body and on one side of the shaft body is discharged from the air outlets. The application increases the ventilation channel on the eccentric crankshaft without affecting the structural strength of the eccentric crankshaft, improves the heat dissipation of the shafting, reduces the temperature of the crankshaft, and can effectively prolong the service life of the crankshaft and the corresponding bearing.

Description

Technical Field

[0001] This application relates to the field of air compressors, and specifically to an eccentric crankshaft with a cooling structure and a reciprocating air compressor. Background Technology

[0002] The eccentric crankshaft is a crucial component of reciprocating air compressors. It has cams mounted on its surface, one end of which connects to the motor to transmit torque. Since most eccentric crankshafts are solid, they generate heat during high-speed operation. If this heat concentrates and causes excessively high local temperatures, it can lead to crankshaft deformation, hindering the normal operation of the reciprocating air compressor and affecting its lifespan. Therefore, the heat dissipation problem of traditional eccentric crankshafts needs improvement. Utility Model Content

[0003] In order to solve or at least partially solve the above-mentioned technical problems, this application provides an eccentric crankshaft with a cooling structure, including an eccentric shaft body;

[0004] The eccentric shaft is equipped with an air duct inside;

[0005] The surface of the eccentric shaft is provided with a plurality of air inlets, which are connected to the air duct;

[0006] A fan is provided on the surface of the eccentric shaft, and a plurality of air outlets are provided on the surface of the eccentric shaft corresponding to the area of ​​the fan, and the air outlets are connected to the air duct.

[0007] The fan is fixed relative to the eccentric shaft so that it generates negative pressure when rotating with the eccentric shaft, forming an airflow path from the air inlet to the air outlet.

[0008] Optionally, the fan is located near one end of the eccentric shaft, and the air inlet is located on the same side of the fan.

[0009] Optionally, the eccentric shaft includes a first shaft and a second shaft;

[0010] The air inlet includes a first air inlet located on a first shaft and a second air inlet located on a second shaft;

[0011] The fan is located at the end of the second shaft away from the first shaft, and the air outlet is located on the second shaft.

[0012] Optionally, the eccentric shaft may further include a third shaft;

[0013] The third shaft is connected to the end of the second shaft away from the first shaft and is coaxially arranged with the first shaft.

[0014] Bearings are respectively mounted on the surfaces of the first shaft and the third shaft.

[0015] Optionally, a cam is mounted on the surface of the second shaft, and the second air inlet is offset from the cam.

[0016] Optionally, the cam is disposed at the end of the second shaft away from the first shaft, and the fan is mounted on the side surface of the cam away from the first shaft.

[0017] Optionally, a first gap is formed between the cam and the bearing on the third shaft, the fan extends from inside the first gap to the outside of the bearing, and the air outlet is disposed within the first gap.

[0018] Optionally, the fan includes a mounting base and a plurality of blades, the mounting base being detachably connected to the cam, and the blades being fixedly mounted on a side surface of the mounting base away from the cam.

[0019] Optionally, the blade is L-shaped and extends from inside the first gap to the outside of the bearing, and a second gap is formed between the blade and the surface of the second shaft.

[0020] This application provides a reciprocating air compressor, comprising:

[0021] A compression mechanism includes a compression cylinder and a piston inside the compression cylinder, the piston being connected to an eccentric crankshaft with a cooling structure as described above;

[0022] A drive mechanism, connected to the eccentric crankshaft, is used to drive the eccentric crankshaft to rotate;

[0023] An air storage tank, connected to the compression cylinder, is used to store compressed air;

[0024] The unit base is used to mount at least one of the compression mechanism, the drive mechanism, and the gas storage tank.

[0025] The eccentric crankshaft with a cooling structure provided in this application has an internal air duct and several air inlets on its surface, which are connected to the air duct. A fan is mounted on the surface of the eccentric crankshaft, and several air outlets are located on the surface of the eccentric crankshaft corresponding to the fan, which are also connected to the air duct. The fan is fixed relative to the eccentric crankshaft and generates negative pressure when it rotates with the eccentric crankshaft, forming an airflow path from the air inlets to the air outlets. This allows heat from inside the eccentric crankshaft and one side of the shaft to be discharged from the air outlets. This application adds ventilation channels to the eccentric crankshaft without affecting its structural strength, thus improving the heat dissipation of the shaft system, reducing the crankshaft temperature, and effectively increasing the service life of the crankshaft and its corresponding bearings.

[0026] The reciprocating air compressor provided in this application, due to the installation of the aforementioned eccentric crankshaft with cooling structure, also possesses all the advantages described above. Attached Figure Description

[0027] To more clearly illustrate the embodiments of this application, the relevant drawings will be briefly described below. It is understood that the drawings described below are only for illustrating some embodiments of this application, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0028] Figure 1 This is a schematic diagram of the eccentric crankshaft with a cooling structure according to this application;

[0029] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0030] Figure 3 This is a schematic diagram of the fan with an eccentric crankshaft having a cooling structure according to this application;

[0031] Figure 4 for Figure 2 Enlarged schematic diagram of section B.

[0032] Explanation of reference numerals in the attached figures:

[0033] 110. First shaft; 111. First air inlet; 120. Second shaft; 121. Second air inlet; 130. Third shaft; 200. Air duct; 300. Air outlet; 400. Fan; 401. Blade; 402. Mounting base; 403. Fixing bolt; 500. Cam; 600. Bearing; 700. Shaft connecting bolt; 800. First clearance; 900. Second clearance. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0037] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides an eccentric crankshaft with a cooling structure for use in a reciprocating air compressor. The eccentric crankshaft includes an eccentric shaft body, on which a cam 500 or a crankshaft connection can be provided. Bearings 600 are connected to both ends of the eccentric shaft body for mounting and fixing. One end of the eccentric shaft body is connected to a motor output shaft, and rotates with the motor output shaft to drive the cam 500 to rotate, thereby realizing the piston movement inside the reciprocating air compressor.

[0040] like Figure 2 As shown, the eccentric shaft in this embodiment has an internal air duct 200 and a number of air inlets on its surface, which are connected to the air duct 200. Similarly, the eccentric shaft also has a number of air outlets 300 on its surface, which are also connected to the air duct 200.

[0041] In this embodiment, the air inlet and air outlet 300 are distributed at different positions along the axial direction of the eccentric shaft. The air duct 200 is arranged along the axial direction of the eccentric shaft, passing through the interior of the eccentric shaft and connecting the air inlet and air outlet 300. In this way, a channel is formed on the eccentric crankshaft from the air inlet to the air duct 200 and then to the air outlet 300.

[0042] like Figure 1 As shown, in this embodiment, a fan 400 is provided on the surface of the eccentric shaft. The fan 400 is arranged around the eccentric shaft, which is the rotating shaft of the fan 400. The fan 400 and the eccentric shaft are fixedly connected. When the eccentric shaft rotates, it drives the fan 400 to rotate.

[0043] In this embodiment, several air outlets 300 are set on the surface of the eccentric shaft in the area corresponding to the fan 400. That is, the air outlets 300 are set close to the fan 400, so that the negative pressure area formed when the fan 400 rotates is near the air outlets 300.

[0044] In this embodiment, the eccentric shaft is equipped with a fan 400, and a channel is formed on the eccentric crankshaft from the air inlet to the air duct 200 and then to the air outlet 300. When the eccentric shaft rotates, the fan 400 rotates with it. The fan 400 approaches the air outlet 300 on the surface of the eccentric shaft, creating a negative pressure. This forms an airflow path from the air inlet to the air outlet 300. Air from outside the eccentric shaft enters the interior of the eccentric shaft through the air inlet, flows along the air duct 200, and is then discharged from the air outlet 300. The flowing air dissipates heat from the area near the air inlet and from the interior of the shaft through the air outlet 300, improving heat dissipation of the shaft system, reducing the temperature of the eccentric shaft, and effectively increasing the service life of the crankshaft and corresponding bearings.

[0045] It is worth mentioning that the larger the area of ​​the air inlet, air outlet 300 and air duct 200 on the eccentric shaft, the better it is for heat dissipation. However, a larger proportion of the opening area will inevitably affect the strength of the eccentric shaft. In order to ensure the necessary strength for the eccentric shaft to transmit torque, the area of ​​the air inlet, air outlet 300 and air duct 200 on the eccentric shaft in this embodiment should be adaptively designed. Under the premise of not affecting the structural strength of the eccentric crankshaft, ventilation channels should be added to the eccentric crankshaft, and the size of the air inlet, air outlet 300 and air duct 200 should be reasonably adjusted to ensure that the strength of the eccentric shaft and the ventilation effect are balanced.

[0046] In one embodiment, the fan 400 is positioned near one end of the eccentric shaft, and the air inlet is located on the same side of the fan 400. This way, when the fan 400 rotates, it draws air from one end of the shaft to the other, ensuring a consistent airflow direction within the shaft and facilitating heat dissipation. Positioning the fan 400 near one end of the eccentric shaft also avoids the cam 500, providing space for the movement of the cam 500 and the piston.

[0047] Of course, in some embodiments, depending on the requirements, the fan 400 can also be located in the middle of the eccentric shaft to concentrate and extract air from both ends of the shaft towards the middle. The specific location of the fan 400 can be determined according to the internal structure of the reciprocating air compressor, and this embodiment is not limited to a single location.

[0048] In one embodiment, such as Figure 1 and Figure 2 As shown, the eccentric shaft includes a first shaft 110, a second shaft 120, and a third shaft 130. The air inlet includes a first air inlet 111 located on the first shaft 110 and a second air inlet 121 located on the second shaft 120. Preferably, the first air inlets 111 are uniformly arranged on the outer peripheral surface of the first shaft 110, and the second air inlets 121 are uniformly arranged on the outer peripheral surface of the second shaft 120.

[0049] The third shaft 130 is connected to the end of the second shaft 120 away from the first shaft 110 and is coaxially arranged with the first shaft 110. The fan 400 is located at the end of the second shaft 120 away from the first shaft 110, and the air outlet 300 is arranged on the second shaft 120. The fan 400 can be located at the connection position between the second shaft 120 and the third shaft 130.

[0050] like Figure 2 As shown, the first shaft 110, the second shaft 120 and the third shaft 130 are connected by shaft connecting bolts 700. The shaft connecting bolts 700 pass through the shaft holes inside the first shaft 110, the second shaft 120 and the third shaft 130 in sequence to connect and fix the three along the axial direction. The shaft hole can be a through hole inside the shaft or a duct 200.

[0051] Bearings 600 are respectively installed on the surfaces of the first shaft 110 and the third shaft 130 for fixing the shaft as a whole.

[0052] In one embodiment, the fan 400 is located on the second shaft 120, and the air outlet 300 is also located on the second shaft 120. The first shaft 110 and the second shaft 120 achieve ventilation and heat dissipation effects, and the third shaft 130 can simply be used as a mounting part of the shaft.

[0053] In another embodiment, such as Figure 2 or Figure 4 As shown, the third shaft 130 also has a through hole. The third shaft 130 is sleeved on one end of the second shaft 120, and the third shaft 130 covers the portion of the second shaft 120 that has an air outlet 300. The through hole on the third shaft 130 communicates with the air outlet 300 on the second shaft 120 to form a new air outlet. It can be understood that the air outlet 300 includes the through hole on the third shaft 130 and the original air outlet 300 on the second shaft 120.

[0054] like Figure 1 As shown, two cams 500 are mounted on the surface of the second shaft 120. The second air inlet 121 is offset from the cams 500. Preferably, the cams 500 are located on both sides of the second air inlet 121. In this embodiment, the second air inlet 121 is opened on the surface of the second shaft 120 at a position that avoids the cams 500, so as to avoid interference between the cams 500 and the second air inlet 121.

[0055] Similarly, the first air inlet 111 on the first shaft 110 is offset from the bearing 600 on the first shaft 110.

[0056] In one embodiment, a gap is also provided between the cam 500 and the bearing 600, and an air inlet can also be provided on the surface of the first shaft 110 or the second shaft 120 at the gap to enhance the heat dissipation effect in the area between the cam 500 and the bearing 600.

[0057] In one embodiment, the first shaft 110 and a cam 500 adjacent to it are integrally formed, and the third shaft 130 and a cam 500 adjacent to it are also integrally formed. That is, the first shaft 110 and the third shaft 130 are crank shafts, and the two crank shafts are sleeved at both ends of the second shaft 120. Both crank shafts are provided with through holes for connecting the ventilation channel 200.

[0058] like Figure 1 As shown, in one embodiment, the cam 500 is disposed at the end of the second shaft 120 away from the first shaft 110, and the fan 400 is mounted on the side surface of the cam 500 away from the first shaft 110. In this embodiment, the fan 400 is mounted on the surface of the cam 500, and the rotation of the cam 500 drives the fan 400 to operate, thereby improving the stability of the fan 400 connection.

[0059] like Figure 4 As shown, a first gap 800 is formed between the cam 500 and the bearing 600 on the third shaft 130. The fan 400 extends from inside the first gap 800 to the outside of the bearing 600, and the air outlet 300 is located inside the first gap 800. When the fan 400 rotates, a negative pressure is formed inside the first gap 800, and the air inside the air duct 200 is discharged from the air outlet 300, thereby carrying away the heat inside the shaft and achieving a heat dissipation effect.

[0060] like Figure 3As shown, in one embodiment, the fan 400 includes a mounting base 402 and a plurality of blades 401. The mounting base 402 has a disc structure, and the plurality of blades 401 are evenly arranged on its surface. The mounting base 402 is detachably connected to one side of the cam 500 by fixing bolts 403, and the blades 401 are fixedly mounted on the surface of the mounting base 402 away from the cam 500. A gap is also maintained between the blades 401 and the bearing 600 to facilitate airflow.

[0061] Specifically, such as Figure 3 and Figure 4 As shown, the blade 401 is vertically mounted on the mounting base 402. The blade 401 is L-shaped, with one side of the L-shape extending outward from the first gap 800 and the other side of the L-shape extending along the axial direction of the shaft to the outside of the bearing 600, so as to increase the blowing effect of the fan 400.

[0062] A second gap 900 is formed between the blade 401 and the surface of the second shaft 120 or the third shaft 130, which facilitates airflow near the air outlet 300.

[0063] Example 2

[0064] This embodiment provides a reciprocating air compressor, which includes a compression mechanism and a drive mechanism. The compression mechanism includes a compression cylinder and a piston inside the compression cylinder. The piston moves inside the compression cylinder to achieve normal operation of the air compressor. The operation of the compression mechanism of the reciprocating air compressor is common knowledge in the field and will not be described in this embodiment.

[0065] The reciprocating air compressor in this embodiment has an eccentric crankshaft with a cooling structure as mentioned in the above embodiment installed inside. The eccentric crankshaft is connected to the piston, and the drive mechanism is connected to the eccentric crankshaft to drive the eccentric crankshaft to rotate.

[0066] This embodiment also includes an air storage tank and a unit base. The air storage tank is connected to the compression cylinder and is used to store compressed air. The unit base is used to install and fix the compression mechanism, the drive mechanism, and the air storage tank.

[0067] The reciprocating air compressor provided in this embodiment has all the advantages mentioned above because it has an eccentric crankshaft with a cooling structure as mentioned in the above embodiment. Therefore, it will not be repeated here.

[0068] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An eccentric crankshaft with a cooling structure, characterized in that, Including eccentric shafts; The eccentric shaft is provided with an air duct (200). The surface of the eccentric shaft is provided with a plurality of air inlets, which are connected to the air duct (200); A fan (400) is provided on the surface of the eccentric shaft, and a plurality of air outlets (300) are provided on the surface of the eccentric shaft corresponding to the area of ​​the fan (400), and the air outlets (300) are connected to the air duct (200); The fan (400) is fixed relative to the eccentric shaft so as to generate negative pressure when it rotates with the eccentric shaft, forming an airflow path from the air inlet to the air outlet (300).

2. The eccentric crankshaft with a cooling structure according to claim 1, characterized in that, The fan (400) is located near one end of the eccentric shaft, and the air inlet is located on the same side of the fan (400).

3. The eccentric crankshaft with a cooling structure according to claim 1, characterized in that, The eccentric shaft includes a first shaft (110) and a second shaft (120); The air inlet includes a first air inlet (111) located on the first shaft (110) and a second air inlet (121) located on the second shaft (120). The fan (400) is located at the end of the second shaft (120) away from the first shaft (110), and the air outlet (300) is disposed on the second shaft (120).

4. The eccentric crankshaft with a cooling structure according to claim 3, characterized in that, The eccentric shaft also includes a third shaft (130). The third shaft (130) is connected to the end of the second shaft (120) away from the first shaft (110) and is coaxially arranged with the first shaft (110); Bearings (600) are respectively mounted on the surfaces of the first shaft (110) and the third shaft (130).

5. The eccentric crankshaft with a cooling structure according to claim 4, characterized in that, A cam (500) is mounted on the surface of the second shaft (120), and the second air inlet (121) is offset from the cam (500).

6. The eccentric crankshaft with a cooling structure according to claim 5, characterized in that, The cam (500) is disposed at one end of the second shaft (120) away from the first shaft (110), and the fan (400) is mounted on the side surface of the cam (500) away from the first shaft (110).

7. The eccentric crankshaft with a cooling structure according to claim 6, characterized in that, A first gap (800) is formed between the cam (500) and the bearing (600) on the third shaft (130), the fan (400) extends from inside the first gap (800) to the outside of the bearing (600), and the air outlet (300) is disposed in the first gap (800).

8. The eccentric crankshaft with a cooling structure according to claim 7, characterized in that, The fan (400) includes a mounting base (402) and a plurality of blades (401). The mounting base (402) is detachably connected to the cam (500), and the blades (401) are fixedly mounted on the side surface of the mounting base (402) away from the cam (500).

9. The eccentric crankshaft with a cooling structure according to claim 8, characterized in that, The blade (401) is L-shaped and extends from the inside of the first gap (800) to the outside of the bearing (600), and a second gap (900) is formed between the blade (401) and the surface of the second shaft (120).

10. A reciprocating air compressor, characterized in that, include: A compression mechanism includes a compression cylinder and a piston inside the compression cylinder, the piston being connected to an eccentric crankshaft with a cooling structure as described in any one of claims 1-9; A drive mechanism, connected to the eccentric crankshaft, is used to drive the eccentric crankshaft to rotate; An air storage tank, connected to the compression cylinder, is used to store compressed air; The unit base is used to mount at least one of the compression mechanism, the drive mechanism, and the gas storage tank.

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