Compression pump cooling structure, air compressor

Abstract

The present invention provides a compression pump body cooling structure and an air compressor. The compression pump body cooling structure includes a movable scroll and a fixed scroll that match each other to form a compression part. An end cover is provided on the side of the movable scroll away from the fixed scroll. A receiving hole is provided on the end cover. The crankshaft passes through the receiving hole and is driven and connected to the movable scroll. The receiving hole is provided with a first gear and a second gear. The first gear is mounted on the crankshaft and meshes with the second gear teeth to form a gear pump structure. The receiving hole is used to accommodate coolant. The gear pump structure can pump the coolant in the receiving hole to the fixed scroll to cool the fixed scroll. The present invention provides a compression pump body cooling structure and an air compressor. The first gear on the pump body crankshaft is meshed with the second gear in the end cover cavity to form a gear pump structure to pump the cooling medium to circulate between the end cover and the fixed scroll, making the structure of the compressor more compact and conducive to the miniaturization and lightweight design of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a compression pump body cooling structure and an air compressor. Background Art

[0002] In oil-free lubricated scroll air compressors, since the temperature rise of the pump body is obvious and high temperature has a great influence on the performance of the compressor, such oil-free lubricated air compressors basically have corresponding cooling structures. There are many types of cooling structures in the prior art, but their functions are to use a medium to generate circulating power through one or more specific structures, and there is a cooling link for the circulating medium, thereby circulating and absorbing the heat generated by the compression process of the pump body to reduce the temperature rise of the pump body. More commonly, the cooling structure in the prior art mostly adopts the arrangement of corresponding pumping components inside or outside the compressor (pump body) body, and uses the cooling device outside the compressor (pump body) body to cool the pump body. This method has a high heat dissipation efficiency, but has the disadvantages of complex structure and large overall size of the compressor. Based on this, the present invention is proposed. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a compression pump body cooling structure and an air compressor, which utilizes the first gear on the pump body crankshaft to engage with the second gear in the end cover cavity to form a gear pump structure to pump the cooling medium to form a circulation between the end cover and the static scroll, making the structure of the compressor more compact and conducive to the miniaturization and lightweight design of the compressor.

[0004] In order to solve the above problems, the present invention provides a compression pump body cooling structure, including a movable scroll and a fixed scroll that match each other to form a compression part, the movable scroll is provided with an end cover on the side away from the fixed scroll, the end cover is provided with a receiving hole, the crankshaft passes through the receiving hole and is driven and connected to the movable scroll, the receiving hole is provided with a first gear and a second gear, the first gear is mounted on the crankshaft and meshes with the second gear teeth to form a gear pump structure, the receiving hole is used to accommodate coolant, and the gear pump structure can pump the coolant in the receiving hole to the fixed scroll to cool the fixed scroll.

[0005] Preferably, it further comprises a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are respectively located at the axial ends of the accommodating hole.

[0006] Preferably, a cooling channel is constructed in the fixed scroll, and the accommodating hole is connected with the cooling channel to form a cooling circulation flow path.

[0007] Preferably, the compression pump body cooling structure further includes a bracket, the bracket is located between the static scroll and the end cover, a connecting flow channel is constructed on the bracket, and the connecting flow channel connects the cooling flow channel and the accommodating hole.

[0008] Preferably, when projected on a plane perpendicular to the axial direction of the fixed scroll, the cooling flow channel is in a vortex shape.

[0009] Preferably, a heat dissipation portion is provided on a side of the fixed scroll facing away from the movable scroll.

[0010] Preferably, the heat dissipation portion includes a plurality of heat dissipation fins.

[0011] Preferably, a liquid injection hole is provided on the wall corresponding to the cooling circulation flow path.

[0012] Preferably, there are a plurality of second gears, and the plurality of second gears are arranged around the first gear and mesh with the first gears respectively.

[0013] The present invention also provides an air compressor, comprising the above-mentioned compression pump body cooling structure.

[0014] The present invention provides a compression pump body cooling structure and an air compressor, wherein the accommodating hole serves as the main storage area for the coolant on the one hand, and is the arrangement area of the gear pump structure on the other hand. The gear pump structure makes full use of the structural type of the end cover and the crankshaft, and synchronously drives the gear pump structure by mounting the first gear sleeve on the crankshaft, so that the pumping capacity of the gear pump structure matches the compression working condition of the compressor pump body, without the need for independent control of the rotational speed of a separately arranged delivery pump as required in the prior art, thereby simplifying the control structure of the compressor pump body cooling structure. At the same time, this technical solution can make the structure of the compressor more compact, which is conducive to the miniaturization and lightweight design of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the internal structure of a compressor according to an embodiment of the present invention, showing a cooling structure of a compression pump body;

[0016] Figure 2 for Figure 1 Schematic diagram of radial section of the static vortex;

[0017] Figure 3 for Figure 1 A schematic structural diagram of another embodiment of the static scroll;

[0018] Figure 4 for Figure 1 Schematic diagram of the layout structure of the middle end cover, first gear, second gear and crankshaft.

[0019] The reference numerals indicate:

[0020] 1. Orbital scroll; 2. Stationary scroll; 21. Cooling channel; 22. Heat dissipation portion; 221. Heat dissipation fins; 3. End cover; 31. Receiving hole; 41. First gear; 42. Second gear; 51. First sealing ring; 52. Second sealing ring; 6. Bracket; 61. Connecting channel; 7. Crankshaft; 8. Motor assembly. DETAILED DESCRIPTION

[0021] See also Figures 1 to 4As shown, according to an embodiment of the present invention, a compression pump body cooling structure is provided, including a movable scroll 1 and a fixed scroll 2 that match each other to form a compression part, the movable scroll 1 is provided with an end cover 3 on the side away from the fixed scroll 2, and the end cover 3 is provided with a receiving hole 31, the crankshaft 7 passes through the receiving hole 31 and is driven and connected to the movable scroll 1, the receiving hole 31 has a first gear 41 and a second gear 42, the first gear 41 is sleeved on the crankshaft 7 and is meshed with the second gear 42 to form a gear pump structure, the receiving hole 31 has a sealing structure to make the receiving hole 31 a relatively closed cavity and accommodate coolant, the receiving hole 31 is used to accommodate coolant, and the gear pump structure can pump the coolant in the receiving hole 31 to the fixed scroll 2 to cool the fixed scroll 2, and it can be understood that the crankshaft 7 is driven and connected to the motor assembly 8, and the receiving hole 31 is similar in structure to the bearing chamber on the end cover 3. In this technical solution, the accommodating hole 31 serves as the main storage area for the coolant on the one hand, and is the layout area of the gear pump structure on the other hand. The gear pump structure makes full use of the structural type of the end cover 3 and the crankshaft 7, and synchronously drives the gear pump structure by mounting the first gear 41 on the crankshaft 7, so that the pumping capacity of the gear pump structure matches the compression working condition of the compressor pump body, without the need for independent control of the speed of a separately arranged delivery pump as required in the prior art, thereby simplifying the control structure of the compressor pump body cooling structure. At the same time, this technical solution can make the structure of the compressor more compact, which is conducive to the miniaturization and lightweight design of the compressor. Specifically, because the first gear 41 is coaxially mounted on the crankshaft 7, when the compressor pump body is operating at high frequency, the air in the pump body compression section generates a large amount of heat and requires a large amount of heat dissipation. The first gear 41 is simultaneously operating at high frequency, enabling the coolant in the cooling circulation path to circulate more rapidly, thereby ensuring greater heat dissipation efficiency and heat dissipation capacity. When the compressor pump body is operating at low frequency, the air in the pump body compression section generates less heat and requires a small amount of heat dissipation. The first gear 41 is simultaneously operating at low frequency, enabling the coolant in the cooling circulation path to circulate at a lower speed, thereby ensuring a match between the heat dissipation capacity and the heat dissipation capacity. A corresponding cooling channel 21 may be provided on the surface of the fixed scroll 2, and preferably, the cooling channel 21 is constructed within the fixed scroll 2, with the receiving hole 31 intersecting the cooling channel 21 to form a cooling circulation path. Placing the interior of the cooling channel 21 closer to the heat source (compressed air) in the compression section further enables more efficient heat dissipation of the fixed scroll 2.

[0022] Preferably, it also includes a first sealing ring 51 and a second sealing ring 52. The first sealing ring 51 and the second sealing ring 52 are respectively located at the axial ends of the accommodating hole 31. The first sealing ring 51 and the second sealing ring 52 reliably seal the axial ends of the accommodating hole 31 to prevent the coolant therein from entering the compression part or the cavity on one side of the motor assembly 8.

[0023] Preferably, the compression pump body cooling structure also includes a bracket 6, which is located between the static scroll 2 and the end cover 3. The axial length of the bracket 6 constitutes the installation space of the movable scroll 1. A connecting flow channel 61 is constructed on the bracket 6, and the connecting flow channel 61 connects the cooling flow channel 21 with the accommodating hole 31. Furthermore, the cooling flow channel 21 is arranged in a spiral shape around the axial direction of the bracket 6. And best, when projected on a plane perpendicular to the axial direction of the static scroll 2, the cooling flow channel 21 is in a spiral shape. Such a setting can increase the contact area between the cooling flow channel 21 and the connecting flow channel 61 and the wall body, thereby correspondingly increasing the heat exchange and heat dissipation area and improving the heat exchange efficiency.

[0024] Furthermore, a heat dissipation portion 22 is provided on the side of the fixed scroll 2 facing away from the movable scroll 1. Specifically, for example, the heat dissipation portion 22 includes a plurality of heat dissipation fins 221. This method can utilize the convection of the airflow outside the pump body to form a radiation heat dissipation effect on the heat of the fixed scroll 2.

[0025] It can be understood that the cooling circulation flow path in the present invention is a closed cycle, which has the characteristic of more efficient circulation of coolant. In order to be able to more conveniently fill the coolant when the cooling structure is insufficient due to leakage of coolant in the closed cycle, preferably, an injection hole is provided on the wall corresponding to the cooling circulation flow path. The wall body can be, for example, the outer wall of the static scroll 2, the outer wall of the bracket 6 or the outer wall of the end cover 3, and the present invention does not make any special limitations.

[0026] Furthermore, there are multiple second gears 42, and the multiple second gears 42 are arranged around the first gear 41 and mesh with the first gear 41 respectively. Specifically, the number of the second gears 42 can be selected according to the volume of the accommodating hole 31 and the heat dissipation requirements of the cooling structure (corresponding to the pumping amount of the coolant).

[0027] According to an embodiment of the present invention, an air compressor is further provided, comprising the above-mentioned compression pump body cooling structure, wherein the air compressor is a scroll air compressor, in particular an oil-free lubricated scroll air compressor.

[0028] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An air compressor, comprising a pump body cooling structure, characterized in that: The air compressor is an oil-free lubricated scroll compressor, and the pump body cooling structure includes a movable scroll (1) and a fixed scroll (2) that match each other to form a compression part. The movable scroll (1) is provided with an end cover (3) on the side away from the fixed scroll (2). The end cover (3) is provided with a receiving hole (31). The crankshaft (7) passes through the receiving hole (31) and is driven and connected to the movable scroll (1). The receiving hole (31) has a first gear (41) and a second gear (42). The first gear (41) is mounted on the crankshaft (7) and meshes with the second gear (42) to form a gear pump structure. The receiving hole (31) is used to accommodate the coolant. The gear pump structure can transfer the coolant to the crankshaft (7). The cooling liquid in the receiving hole (31) is pumped to the static vortex (2) to cool the static vortex (2); a cooling channel (21) is constructed in the static vortex (2), and the receiving hole (31) and the cooling channel (21) are connected to form a cooling circulation flow path; the cooling liquid also includes a bracket (6), the bracket (6) is located between the static vortex (2) and the end cover (3), and a connecting flow path (61) is constructed on the bracket (6), and the connecting flow path (61) connects the cooling channel (21) and the receiving hole (31); the cooling circulation flow path is a closed cycle, and an injection hole is provided on the outer wall of the static vortex (2), the outer wall of the bracket (6) or the outer wall of the end cover (3).

2. The air compressor according to claim 1, characterized in that The pump body cooling structure further comprises a first sealing ring (51) and a second sealing ring (52), wherein the first sealing ring (51) and the second sealing ring (52) are respectively located at two axial ends of the accommodating hole (31).

3. The air compressor according to claim 1, characterized in that When projected onto a plane perpendicular to the axial direction of the static scroll (2), the cooling flow channel (21) is in a vortex shape.

4. The air compressor according to claim 1, characterized in that A heat dissipation portion (22) is provided on the side of the fixed scroll (2) facing away from the movable scroll (1).

5. The air compressor according to claim 4, characterized in that The heat dissipation portion (22) includes a plurality of heat dissipation fins (221).

6. The air compressor according to any one of claims 1 to 5, characterized in that: There are a plurality of second gears (42), and the plurality of second gears (42) are arranged around the first gear (41) and are respectively meshed with the first gear (41).

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