Cooling structure and two-stage air cooling compressor

Abstract

The utility model provides a cooling structure and a two-stage air cooling compressor. The cooling structure comprises a fan and a cooler, the fan is connected to the end of the crankshaft exposed out of the body; the cooler is connected with the machine body and located on the side, away from the machine body, of the fan, a first-stage cooling air duct and a second-stage cooling air duct are arranged in the cooler, the first-stage cooling air duct is connected with the exhaust end of the first-stage compression cylinder and connected with the air inlet end of the second-stage compression cylinder, and the second-stage cooling air duct is connected with the exhaust end of the second-stage compression cylinder and provided with a terminal exhaust port; and the fan synchronously rotates along with the crankshaft so as to blow cooling air for cooling the first-stage cooling air duct and the second-stage cooling air duct to the cooler. According to the cooling structure and the two-stage air cooling compressor, the first-stage cooling air duct and the second-stage cooling air duct are integrally arranged in the cooler, the cooling efficiency of the whole machine can be remarkably improved through the secondary cooling process, and the structural compactness of the whole machine can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air compressors, and in particular relates to a cooling structure and a two-stage air-cooling compressor. Background Art

[0002] An air compressor is a device used to compress gas. The structure of an air compressor is similar to that of a water pump. Most air compressors are reciprocating piston type, rotary vane type or rotary screw type structures. Among them, a reciprocating piston air compressor uses a motor or other power source to drive the crankshaft assembly to rotate, thereby achieving reciprocating motion of the piston in the compression cylinder to perform work. Its advantage lies in its high pressure output range and gas compression efficiency. Therefore, most vehicle air compression systems use reciprocating piston air compressors to provide the necessary high-pressure air source to the braking system, suspension system and other auxiliary air devices.

[0003] Currently, common piston air compressors usually use a two-stage compression method to obtain a relatively high air pressure. Since heat is generated during the air compression process, it is necessary to set up cooling mechanisms such as water cooling, air cooling, and oil cooling to cool the air compressor. Among them, the air cooling method has obvious advantages in overall cost control, but its disadvantage is that the cooling efficiency and overall compactness are not as good as water cooling and oil cooling methods. Therefore, it is necessary to improve the air cooling structure of the air compressor to enhance product competitiveness. Utility Model Content

[0004] The embodiment of the utility model provides a cooling structure, aiming to improve the air cooling efficiency and compactness of a two-stage air-cooled air compressor.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: in the first aspect, a cooling structure is provided, including a fan and a cooler; the fan is connected to the end of the crankshaft exposed from the machine body; the cooler is connected to the machine body and is located on the side of the fan away from the machine body, and a primary cooling air duct and a secondary cooling air duct are arranged in the cooler, the primary cooling air duct is connected to the exhaust end of the primary compression cylinder and to the intake end of the secondary compression cylinder, and the secondary cooling air duct is connected to the exhaust end of the secondary compression cylinder and has a terminal exhaust port;

[0006] The fan rotates synchronously with the crankshaft to blow cooling air to the cooler for cooling the primary cooling air duct and the secondary cooling air duct.

[0007] In combination with the first aspect, in a possible implementation, the cooler includes an intake tube shell, an exhaust tube shell, a plurality of first-level heat dissipation fins and a plurality of second-level heat dissipation fins; wherein the intake tube shell is connected to the body and is internally divided to form a first-level intake cavity and a second-level intake cavity; the exhaust tube shell is connected to the body and is spaced apart from the intake tube shell, and the internal division of the exhaust tube shell forms a first-level exhaust cavity and a second-level exhaust cavity; each first-level heat dissipation fin is spaced apart and the two ends of each first-level heat dissipation fin are respectively connected to the first-level intake cavity and the first-level exhaust cavity, and each first-level heat dissipation fin and the first-level intake cavity and the first-level exhaust cavity together form a first-level cooling air duct; each second-level heat dissipation fin is spaced apart and the two ends of each second-level heat dissipation fin are respectively connected to the second-level intake cavity and the second-level exhaust cavity; each second-level heat dissipation fin and the second-level intake cavity and the second-level exhaust cavity together form a second-level cooling air duct.

[0008] In some embodiments, the air intake pipe shell and the exhaust pipe shell are both arranged in the vertical direction, and the lower end of the first-stage exhaust cavity and the lower end of the second-stage exhaust cavity are both connected to a drainage component.

[0009] Exemplarily, the drain assembly includes a drain body and a solenoid valve; the drain body is connected to the exhaust pipe shell and communicated with the lower end of the primary exhaust chamber / secondary exhaust chamber; the solenoid valve is connected to the drain body and electrically connected to the whole machine controller, and is used to open or close according to the control signal sent by the whole machine controller; wherein, when the solenoid valve is opened, the condensed water gathered at the bottom of the primary exhaust chamber / secondary exhaust chamber is discharged through the drain body.

[0010] For example, the drainage component also includes electric heating, which is installed on the drainage body and electrically connected to the whole machine controller. The electric heating is used to heat the drainage body by electricity.

[0011] In a possible implementation, a drain port is further provided at the bottom of the primary exhaust chamber and the secondary exhaust chamber, and a plug is sealed and connected inside the drain port.

[0012] In some embodiments, the first-stage air intake chamber has a first-stage air intake port corresponding to the number of the first-stage compression cylinders, the first-stage exhaust chamber has a first-stage exhaust port corresponding to the number of the second-stage compression cylinders, the second-stage air intake chamber has a second-stage air intake port corresponding to the number of the second-stage compression cylinders, and the second-stage exhaust chamber is provided with a terminal exhaust port.

[0013] In some embodiments, a cover is connected to a side of the cooler close to the body, and the fan extends into the cover.

[0014] For example, a protective net is provided at one end of the cover shell close to the body, and the protective net has an avoidance hole suitable for the rotation shaft of the fan to pass through.

[0015] The beneficial effect of the cooling structure provided by the utility model is that compared with the prior art, the cooling structure of the utility model is that, the first-stage compressed air whose temperature rises after being compressed and done by the first-stage compression cylinder can be cooled and cooled in the first-stage cooling air duct, thereby reducing the intake temperature of the second-stage compression cylinder, and the second-stage compressed air whose temperature rises again after being further compressed and done by the second-stage compression cylinder can be cooled and cooled again in the second-stage cooling air duct and then discharged from the terminal exhaust port. Since the first-stage cooling air duct and the second-stage cooling air duct are integrated inside the cooler, both of them can contact the cooling air blown by the fan for heat exchange, thereby not only significantly improving the cooling efficiency of the whole machine through the secondary cooling process, but also improving the compactness of the whole machine structure.

[0016] In a second aspect, an embodiment of the utility model further provides a two-stage air-cooled compressor, comprising the above-mentioned cooling structure.

[0017] Compared with the prior art, the two-stage air-cooled compressor provided by the utility model adopts the above-mentioned cooling mechanism in the cooling structure of the utility model, and has the same beneficial effects as the above-mentioned cooling structure. The primary cooling air duct and the secondary cooling air duct are integrated inside the cooler, so both can contact the cooling air blown by the fan for heat exchange, thereby not only significantly improving the cooling efficiency of the whole machine through the secondary cooling process, but also improving the compactness of the whole machine structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the installation structure of the cooling structure provided by the embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the three-dimensional structure of the cooling structure provided by an embodiment of the utility model;

[0020] Figure 3 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the internal structure of the cooler used in the embodiment of the utility model.

[0022] In the figure: 10, fan; 20, cooler; 201, drain outlet; 202, plug; 21, air intake shell; 211, first-stage air intake cavity; 2111, first-stage air intake port; 212, second-stage air intake cavity; 2121, second-stage air intake port; 22, exhaust shell; 221, first-stage exhaust cavity; 2211, first-stage exhaust port; 222, second-stage exhaust cavity; 2221, terminal exhaust port; 23, first-stage heat dissipation fin; 24, second-stage heat dissipation fin; 30, drain assembly; 31, drain body; 32, solenoid valve; 33, electric heating; 40, cover; 50, protective net; 60, crankcase. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that when an element is referred to as being "disposed on" or "connected to" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meanings of "multiple" and "several" are two or more, unless otherwise clearly and specifically defined.

[0025] Please also read Figures 1 to 4 , the cooling structure provided by the utility model is now described. The cooling structure includes a fan 10 and a cooler 20; the fan 10 is connected to the end of the crankshaft exposed from the machine body; the cooler 20 is connected to the machine body and is located on the side of the fan 10 away from the machine body, and a primary cooling air duct and a secondary cooling air duct are arranged in the cooler 20, the primary cooling air duct is connected to the exhaust end of the primary compression cylinder and the intake end of the secondary compression cylinder, the secondary cooling air duct is connected to the exhaust end of the secondary compression cylinder, and has a terminal exhaust port 2221; wherein the fan 10 rotates synchronously with the crankshaft to blow cooling air for cooling the primary cooling air duct and the secondary cooling air duct to the cooler 20.

[0026] It should be noted that the fan 10 in this embodiment is an axial flow fan. Since the fan 10 is located between the cooler 20 and the machine body (specifically the crankcase 60), when the fan 10 blows air toward the cooler 20, a negative pressure draft is formed between the fan 10 and the crankcase 60, thereby enabling the cooling air to take away the heat on the surface of the crankcase 60. The cooling air blowing toward the cooler 20 can simultaneously exchange heat with the primary cooling air duct and the secondary cooling air duct, thereby taking away the heat on the surfaces of the primary cooling air duct and the secondary cooling air duct, so that the primary compressed air passing through the primary cooling air duct and the secondary compressed air passing through the secondary cooling air duct are cooled. Of course, as a variation of the heat dissipation method of the above-mentioned fan 10, the fan 10 can also blow air toward the surface of the crankcase 60 and draw air from the side of the cooler 20, thereby ensuring that the cooling air exchanges heat with the cooler 20 first, and then the surface of the crankcase 60 generates airflow to take away the heat; the above two methods can both have a good cooling effect. Considering that the obstruction of the crankcase 60 to the airflow may affect the airflow circulation efficiency, the present embodiment preferably adopts the setting method in which the fan 10 blows air toward the cooler 20.

[0027] Compared with the prior art, the cooling structure provided in this embodiment is that the first-stage compressed air whose temperature rises after being compressed and done by the first-stage compression cylinder can be cooled in the first-stage cooling air duct, thereby reducing the intake temperature of the second-stage compression cylinder; the second-stage compressed air whose temperature rises again after being further compressed and done by the second-stage compression cylinder can be cooled again in the second-stage cooling air duct and then discharged from the terminal exhaust port 2221. Since the first-stage cooling air duct and the second-stage cooling air duct are integrated inside the cooler 20, both of them can contact the cooling air blown by the fan 10 for heat exchange, thereby not only significantly improving the cooling efficiency of the whole machine through the secondary cooling process, but also improving the compactness of the whole machine structure.

[0028] Specifically, in this embodiment, see Figure 4 The cooler 20 comprises an air intake shell 21, an exhaust shell 22, a plurality of primary heat dissipation fins 23 and a plurality of secondary heat dissipation fins 24; wherein the air intake shell 21 is connected to the machine body and is internally divided to form a primary air intake cavity 211 and a secondary air intake cavity 212; the exhaust shell 22 is connected to the machine body and is spaced apart from the air intake shell 21, and the internal division of the exhaust shell 22 forms a primary exhaust cavity 221 and a secondary exhaust cavity 222; each primary heat dissipation fin 23 is spaced apart and the two ends of each primary heat dissipation fin 23 are respectively connected to the primary air intake cavity 211 and the primary exhaust cavity 221, and each primary heat dissipation fin 23 and the primary air intake cavity 211 and the primary exhaust cavity 221 jointly form a primary cooling air duct; each secondary heat dissipation fin 24 is spaced apart and the two ends of each secondary heat dissipation fin 24 are respectively connected to the secondary air intake cavity 212 and the secondary exhaust cavity 222; each secondary heat dissipation fin 24 and the secondary air intake cavity 212 and the secondary exhaust cavity 222 jointly form a secondary cooling air duct.

[0029] After the air is taken in by the intake pipe shell 21, the high-temperature intake air is diverted by using a plurality of parallel heat dissipation tube sheets and finally discharged after being gathered in the exhaust pipe shell 22. The heat dissipation tube sheets have a large surface area. When the cooling air blown by the fan 10 passes through the gaps between adjacent heat dissipation tube sheets, the heat on the heat dissipation tube sheets can be quickly taken away, thereby cooling the high-temperature intake air and reducing the temperature of the air discharged from the exhaust pipe shell 22. This structure can ensure the circulation efficiency of the compressed air and avoid the phenomenon of pipe expansion caused by air flow obstruction. Of course, it should be understood that since the primary cooling air duct and the secondary cooling air duct are not connected to each other, the inside of the intake pipe shell 21 can be divided by a baffle. The first-stage air intake chamber 211 and the second-stage air intake chamber 212 are separated and formed. Similarly, the interior of the exhaust pipe shell 22 is also separated by a baffle to form a first-stage exhaust chamber 221 and a second-stage exhaust chamber 222. The first-stage air intake chamber 211 and the first-stage exhaust chamber 221 are connected through a plurality of first-stage heat dissipation fins 23, and the second-stage air intake chamber 212 and the second-stage exhaust chamber 222 are connected through a plurality of second-stage heat dissipation fins 24. The first-stage heat dissipation fins 23 and the second-stage heat dissipation fins 24 respectively occupy half of the area of ​​the cooler 20, thereby achieving synchronous cooling of the first-stage compressed air and the second-stage compressed air, which can not only improve the cooling efficiency, but also ensure the compactness of the overall structure.

[0030] Please note that Figures 1 to 4 In this embodiment, the air intake shell 21 and the exhaust shell 22 are both arranged in the vertical direction, and the lower ends of the first exhaust chamber 221 and the lower ends of the second exhaust chamber 222 are both connected to a drainage assembly 30. Since the air intake of the air compressor is the outside atmosphere, the compressed air contains water molecules, so condensed water will be generated when the high-temperature compressed air is cooled. In order to avoid excessive condensed water from being discharged from the first exhaust chamber 221 with the first compressed air and entering the second compression cylinder, and from being discharged from the second exhaust chamber 222 with the second compressed air and entering the gas-using equipment, the air intake shell 21 and the exhaust shell 22 are arranged in the vertical direction. At the same time, considering that the cooling of the compressed air is mainly in the heat dissipation tube sheet, combined with the air flow direction, it can be judged that the condensed water will enter the exhaust chamber and drip to the bottom of the first exhaust chamber 221 and the second exhaust chamber 222 under the action of gravity. Therefore, drainage assemblies 30 are respectively arranged at the bottom of the first exhaust chamber 221 and the second exhaust chamber 222 to discharge the condensed water in time, so as to avoid excessive condensed water from gathering and affecting normal operation.

[0031] As a specific embodiment of the drainage assembly 30, please refer to Figure 3The drainage assembly 30 includes a drainage body 31 and a solenoid valve 32; the drainage body 31 is connected to the exhaust pipe shell 22, and is communicated with the lower end position of the first-stage exhaust chamber 221 / the second-stage exhaust chamber 222; the solenoid valve 32 is connected to the drainage body 31, and is electrically connected to the whole machine controller, and is used to open or close according to the control signal sent by the whole machine controller; wherein, when the solenoid valve 32 is opened, the condensed water collected at the bottom of the first-stage exhaust chamber 221 / the second-stage exhaust chamber 222 is discharged through the drainage body 31.

[0032] Here, the drain body 31 can be understood as a tubular component. The solenoid valve 32 is connected to the drain body 31 and can control the switch action through the whole machine controller, so as to facilitate the regular opening of the solenoid valve 32 to allow the drain body 31 to discharge the condensed water, and after the condensed water is discharged, the solenoid valve 32 is closed to prevent the compressed air in the exhaust chamber from leaking out of the drain body 31.

[0033] Some possible implementations include Figure 3 As shown, the drainage assembly 30 also includes an electric heat tracing 33, which is mounted on the drainage body 31 and electrically connected to the whole machine controller. The electric heat tracing 33 is used to energize and heat the drainage body 31. Since condensed water has the phenomenon of freezing, especially when the ambient temperature is low and the air compressor is shut down, the freezing problem is more serious. The freezing of the drainage body 31 will affect the normal drainage of the drainage body 31. Therefore, the electric heat tracing 33 is mounted on the drainage body 31, and the drainage body 31 is heated and melted by the electric heat tracing 33, so that the drainage body 31 can drain normally.

[0034] It should be noted that the electric heating 33 is a commonly used de-icing and anti-freezing device in the prior art. The specific structure is a heating cable. The electric heating 33 can be wrapped around the drainage body 31, and the installation method is simple.

[0035] In some embodiments, such as Figure 3 and Figure 4 As shown, the bottom of the primary exhaust chamber 221 and the secondary exhaust chamber 222 is also provided with a drain port 201, and a plug 202 is sealed and connected inside the drain port 201. In order to avoid the problem that the drain body 31 cannot drain water smoothly due to the failure of the solenoid valve 32, a spare drain port 201 can be provided at the bottom of the primary drain chamber and the secondary drain chamber. Under normal circumstances, the plug 202 blocks the drain port 201. When the drain assembly 30 cannot drain water smoothly or the water is not completely drained, the plug 202 can be unscrewed and the drain port 201 can be used to drain water, thereby avoiding the failure of the drain assembly 30 and affecting the normal operation of the air compressor.

[0036] It should be understood that, in this embodiment, the first-stage air intake chamber 211 has a first-stage air intake port 2111 corresponding to the number of the first-stage compression cylinders, the first-stage exhaust chamber 221 has a first-stage exhaust port 2211 corresponding to the number of the second-stage compression cylinders, the second-stage air intake chamber 212 has a second-stage air intake port 2121 corresponding to the number of the second-stage compression cylinders, and the second-stage exhaust chamber 222 is provided with a terminal exhaust port 2221. Corresponding air ports are configured according to the number of the first-stage compression cylinders and the second-stage compression cylinders configured in the air compressor, so that the intake and exhaust of each first-stage compression cylinder and each second-stage compression cylinder do not affect each other, which is conducive to improving the operation stability of the whole machine.

[0037] It should be noted that see Figure 1 and Figure 2 In some embodiments, a cover 40 is connected to the side of the cooler 20 close to the body, and the fan 10 extends into the cover 40. The cover 40 can be provided to allow all cooling air blown by the fan 10 to be blown toward the cooler 20 to improve cooling efficiency. On the other hand, a protective ring can be formed around the fan 10 to prevent foreign objects from invading and damaging the fan 10, and to prevent a safety accident caused by a human body accidentally touching the fan 10.

[0038] In order to further improve the protection effect of the fan 10 and prevent the human body from accidentally touching the fan 10, as Figure 2 As shown, a protective net 50 is provided at one end of the housing 40 close to the body, and the protective net 50 has an escape hole suitable for the rotation shaft of the fan 10 to pass through. The protective net 50 can prevent a person from being injured by touching the fan 10 through the gap between the fan 10 and the crankcase 60, and can also be used to cover the end of the housing 40 with the protective net 50 to prevent foreign objects from invading and damaging the fan 10.

[0039] Based on the same inventive concept, see Figures 1 to 4 It is understood that the embodiment of the present application also provides a two-stage air-cooled compressor, including the above-mentioned cooling structure.

[0040] Compared with the prior art, the two-stage air-cooled compressor provided in this embodiment adopts the above-mentioned cooling structure, and the primary cooling air duct and the secondary cooling air duct are integrated inside the cooler 20, so that both can be exposed to the cooling air blown out by the fan 10 for heat exchange, thereby not only significantly improving the cooling efficiency of the whole machine through the secondary cooling process, but also improving the compactness of the whole machine structure.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling structure, characterized in that: include: A fan connected to the end of the crankshaft exposed from the engine body; A cooler connected to the machine body and located on a side of the fan away from the machine body, wherein a primary cooling air duct and a secondary cooling air duct are provided in the cooler, wherein the primary cooling air duct is connected to the exhaust end of the primary compression cylinder and to the air inlet end of the secondary compression cylinder, and the secondary cooling air duct is connected to the exhaust end of the secondary compression cylinder and has a terminal exhaust port; The fan rotates synchronously with the crankshaft to blow cooling air to the cooler for cooling the primary cooling air duct and the secondary cooling air duct.

2. The cooling structure according to claim 1, characterized in that: The cooler comprises: An air intake pipe shell, connected to the engine body and internally divided into a primary air intake cavity and a secondary air intake cavity; An exhaust pipe shell connected to the engine body and spaced apart from the intake pipe shell, wherein the interior of the exhaust pipe shell is divided into a primary exhaust chamber and a secondary exhaust chamber; A plurality of first-level heat dissipation fins are arranged at intervals and both ends of each first-level heat dissipation fin are respectively connected to the first-level air inlet cavity and the first-level air outlet cavity, and each first-level heat dissipation fin, the first-level air inlet cavity and the first-level air outlet cavity jointly form the first-level cooling air duct; A plurality of secondary heat dissipation fins are distributed at intervals and both ends of each of the secondary heat dissipation fins are respectively connected to the secondary air inlet cavity and the secondary exhaust cavity; each of the secondary heat dissipation fins, the secondary air inlet cavity and the secondary exhaust cavity together form the secondary cooling air duct.

3. The cooling structure according to claim 2, characterized in that: The air intake pipe shell and the exhaust pipe shell are both arranged in a vertical direction, and the lower end of the first-stage exhaust cavity and the lower end of the second-stage exhaust cavity are both connected with a drainage component.

4. The cooling structure according to claim 3, characterized in that: The drainage assembly comprises: A drainage body, connected to the exhaust pipe shell and communicated with the lower end of the primary exhaust cavity / the secondary exhaust cavity; A solenoid valve connected to the drainage body and electrically connected to the whole machine controller, and used to open or close according to a control signal sent by the whole machine controller; Wherein, when the solenoid valve is opened, the condensed water collected at the bottom of the primary exhaust chamber / the secondary exhaust chamber is discharged through the drainage body.

5. The cooling structure according to claim 4, characterized in that: The drainage component also includes electric heating, which is mounted on the drainage body and electrically connected to the whole machine controller. The electric heating is used to heat the drainage body by electricity.

6. The cooling structure according to claim 2, characterized in that: The bottoms of the primary exhaust chamber and the secondary exhaust chamber are also provided with drainage ports, and plugs are sealed and connected inside the drainage ports.

7. The cooling structure according to claim 2, characterized in that: The first-stage air intake chamber has a first-stage air intake port corresponding to the number of the first-stage compression cylinders, the first-stage exhaust chamber has a first-stage exhaust port corresponding to the number of the second-stage compression cylinders, the second-stage air intake chamber has a second-stage air intake port corresponding to the number of the second-stage compression cylinders, and the second-stage exhaust chamber is provided with the terminal exhaust port.

8. The cooling structure according to any one of claims 1 to 7, characterized in that: A cover is connected to one side of the cooler close to the machine body, and the fan extends into the cover.

9. The cooling structure according to claim 8, characterized in that: A protective net is provided on one end of the cover shell close to the machine body, and the protective net has an avoidance hole suitable for the rotating shaft of the fan to pass through.

10. Two-stage air-cooled compressor, characterized in that: Comprising the cooling structure according to any one of claims 1 to 9.

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