V-type four-cylinder water-cooled oil-free air compressor and new energy vehicle

Abstract

The application relates to the technical field of oil-free air compressors, in particular to a V-shaped four-cylinder water-cooled oil-free air compressor and a new energy vehicle. The V-shaped four-cylinder water-cooled oil-free air compressor comprises a box body, a high-pressure piston cylinder assembly and a low-pressure piston cylinder assembly arranged in a V shape on the box body, a first expansion chamber arranged in the low-pressure piston cylinder assembly, a second expansion chamber and a high-pressure air inlet cavity arranged in the high-pressure piston cylinder assembly, and an inter-stage air passage arranged between the first expansion chamber and the second expansion chamber; according to the flow direction of compressed air, the first expansion chamber, the inter-stage air passage, the second expansion chamber and the high-pressure air inlet cavity are sequentially arranged and connected. The application solves the technical problems existing in the prior art, i.e. how to reduce the gas pulsation noise of the oil-free air compressor.

Description

Technical Field

[0001] This application relates to the field of oil-free air compressor technology, and in particular to a V-type four-cylinder water-cooled oil-free air compressor and a new energy vehicle. Background Technology

[0002] Electric air compressors are directly driven by motors and can be started, stopped, and speed adjusted according to the air demand of the vehicle. They are a core safety component of the braking system of new energy commercial vehicles.

[0003] Electric air compressors provide compressed air for braking in new energy commercial vehicles. Existing oil-free piston air compressors have the drawback of high noise levels. Oil-free air compressors eliminate lubricating oil and lack the buffering and attenuation effect of an oil film on airflow pulsation. The noise from gas pulsation is directly transmitted to the vehicle chassis, which can easily cause chassis and frame resonance, further amplifying the noise.

[0004] Therefore, how to reduce the gas pulsation noise of oil-free air compressors is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned deficiencies in the prior art by providing a V-type four-cylinder water-cooled oil-free air compressor and a new energy vehicle.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A V-type four-cylinder water-cooled oil-free air compressor includes a housing and a high-pressure piston cylinder assembly and a low-pressure piston cylinder assembly arranged in a V-shape on the housing. The low-pressure piston cylinder assembly is provided with a first expansion chamber, and the high-pressure piston cylinder assembly is provided with a second expansion chamber and a high-pressure intake chamber. An interstage air passage is provided between the first expansion chamber and the second expansion chamber. The first expansion chamber, the interstage air passage, the second expansion chamber, and the high-pressure intake chamber are arranged and connected in sequence according to the flow direction of compressed air.

[0008] Furthermore, the cross-sectional dimensions and shape of the interstage airway are different from those of the first expansion chamber and the second expansion chamber.

[0009] Furthermore, an air inlet is provided on one side of the enclosure.

[0010] The low-pressure piston cylinder assembly includes a low-pressure cylinder body, a low-pressure valve plate, a low-pressure cylinder head, and a low-pressure piston connecting rod. Two low-pressure cylinder bores are provided in the low-pressure cylinder body. The low-pressure cylinder head is fastened to the low-pressure cylinder body and is integrally formed with the low-pressure cylinder body. A low-pressure valve plate is provided between the low-pressure cylinder head and the low-pressure cylinder body. The low-pressure cylinder head and the low-pressure valve plate together restrict the formation of a first expansion chamber. A low-pressure check valve is provided on the low-pressure valve plate. The low-pressure check valve is used to unilaterally guide the low-pressure cylinder bores toward the first expansion chamber.

[0011] There are two low-pressure piston connecting rods, one low-pressure cylinder bore corresponds to one low-pressure piston connecting rod, the low-pressure piston of the low-pressure piston connecting rod can be movably inserted into the low-pressure cylinder bore, and the low-pressure connecting rod of the low-pressure piston connecting rod is rotatably connected to the crankshaft assembly inside the housing.

[0012] The high-pressure piston cylinder assembly includes a high-pressure cylinder body, a high-pressure valve plate, a high-pressure cylinder head, and a high-pressure piston connecting rod.

[0013] The high-pressure valve plate is positioned between the high-pressure cylinder body and the high-pressure cylinder head, and the high-pressure cylinder head, high-pressure valve plate, and high-pressure cylinder body are detachably connected. Two high-pressure cylinder bores are provided within the high-pressure cylinder body, and the high-pressure cylinder head and high-pressure valve plate together restrict the formation of a high-pressure intake chamber and a high-pressure exhaust chamber. The high-pressure valve plate is equipped with a first high-pressure check valve, which directs the high-pressure intake chamber unidirectionally toward the high-pressure cylinder bores. The high-pressure valve plate also has a second high-pressure check valve, which directs the high-pressure cylinder bores unidirectionally toward the high-pressure exhaust chambers. An exhaust port is located on one side of the high-pressure cylinder body.

[0014] There are two high-pressure piston connecting rods, one high-pressure cylinder bore corresponds to one high-pressure piston connecting rod, the high-pressure piston of the high-pressure piston connecting rod can be movably inserted into the high-pressure cylinder bore, and the high-pressure connecting rod of the high-pressure piston connecting rod is rotatably connected to the crankshaft assembly;

[0015] The interstage air passage is located inside the combination of the low-pressure cylinder block and the high-pressure cylinder block. One end of the interstage air passage is connected to the first expansion chamber, and the other end is connected to the second expansion chamber.

[0016] The air inlet, low-pressure cylinder bore, first expansion chamber, interstage air passage, second expansion chamber, high-pressure air inlet chamber, high-pressure cylinder bore, high-pressure exhaust chamber, and air outlet are connected in sequence.

[0017] Furthermore, a water inlet connector is provided on one side of the low-pressure cylinder block, a first cooling water channel is provided inside the low-pressure cylinder block, a second cooling water channel is provided inside the high-pressure cylinder block, a water-passing bolt is provided between the high-pressure valve plate and the high-pressure cylinder head, and a water-passing channel is provided on the water-passing bolt; a high-pressure inner cavity is provided inside the high-pressure cylinder head, and a water outlet connector is provided on one side of the high-pressure cylinder block.

[0018] The water inlet connector, the first cooling water channel, the second cooling water channel, the water passage, the high-pressure inner cavity, and the water outlet connector are arranged and connected in sequence.

[0019] The coolant inside the high-pressure inner cavity can exchange heat with both the high-pressure intake cavity and the high-pressure exhaust cavity simultaneously.

[0020] The first cooling water channel is annular and surrounds the first expansion chamber and the two low-pressure cylinder bores;

[0021] The second cooling water channel is annular and surrounds the two high-pressure cylinder bores, and the second expansion chamber is annular and surrounds the second cooling water channel.

[0022] Furthermore, within the outline of the first expansion chamber, the low-pressure cylinder head has several spaced low-pressure heat dissipation columns on the side facing the low-pressure cylinder bore.

[0023] Furthermore, the axis of the low-pressure cylinder bore is set at a right angle to the axis of the high-pressure cylinder bore.

[0024] Furthermore, the cavity of the high-pressure inner cavity has several high-pressure heat dissipation columns arranged at intervals.

[0025] Furthermore, it also includes an air-cooled motor, which is installed on one side of the housing, and the output shaft of the air-cooled motor is used to drive the crankshaft assembly to rotate synchronously;

[0026] It also includes mounting brackets and shock-absorbing pads. The combination of the housing and the air-cooled motor is connected to the shock-absorbing pads via the mounting brackets.

[0027] Alternatively, the V-type four-cylinder water-cooled oilless air compressor also includes a water-cooled motor and a water hose. The water-cooled motor is located on one side of the housing, and the output shaft of the water-cooled motor is used to drive the crankshaft assembly to rotate synchronously.

[0028] The water-cooled motor has a water-cooling inlet and a water-cooling outlet on the outside of its casing. The water-cooling inlet, water-cooling outlet, water hose, water inlet connector, first cooling water channel, second cooling water channel, water passage, high-pressure inner cavity, and water outlet connector are arranged and connected in sequence.

[0029] A new energy vehicle was also proposed, which includes the aforementioned V-type four-cylinder water-cooled oil-free air compressor.

[0030] Compared with existing technologies, the advantages of this utility model are:

[0031] I. In this utility model, the gas flows sequentially through the first expansion chamber, the interstage air passage, the second expansion chamber, and the high-pressure intake chamber, resulting in multiple abrupt changes in the flow cross section. The gas pulsation sound energy is dissipated, achieving resistance noise reduction and effectively reducing the airflow pulsation noise of the two-stage compression. This meets the low-noise requirements of the vehicle and solves the technical problems existing in the prior art.

[0032] II. In this utility model, the interstage air passage is located inside the low-pressure cylinder and the high-pressure cylinder combination. This brings the following benefits: First, it can reduce the number of external pipelines, connectors and other parts, simplify the assembly process of the whole machine, and reduce the cost of parts and the risk of leakage; Second, the built-in interstage air passage shortens the gas transmission path between the high-pressure and low-pressure cylinders, reduces the pressure loss of gas along the path, and helps to improve the volumetric efficiency of two-stage compression; Third, the interstage air passage is integrated inside the low-pressure cylinder and the high-pressure cylinder combination, with a compact structure, occupies less external space, and helps to reduce the overall size of the air compressor.

[0033] Third, in this utility model, the coolant in the high-pressure inner cavity can simultaneously exchange heat with the high-pressure air intake cavity and the high-pressure exhaust cavity, thereby achieving the maximum cooling efficiency of the high-pressure inner cavity.

[0034] IV. In this utility model, the first cooling water channel is annular and surrounds the first expansion chamber and the two low-pressure cylinder bores; the annular first cooling water channel forms an encircling heat exchange cooling for the first expansion chamber and the two low-pressure cylinder bores, increasing the heat exchange contact range, quickly removing the heat generated by the first-stage compressed gas, effectively controlling the working temperature of the low-pressure cylinder bores and the gas temperature of the first-stage compressed gas flowing in the first expansion chamber, reducing the heat generated by the reciprocating friction of the low-pressure piston connecting rod, and helping to extend the service life of the components.

[0035] V. In this utility model, the second cooling water channel is annular and surrounds the two high-pressure cylinder bores, and the second expansion chamber is annular and surrounds the second cooling water channel. The high-pressure cylinder bores are the secondary compression area with a higher compression ratio and greater heat generation. The annular second cooling water channel can form a circumferential wrapping cooling effect on the high-pressure cylinder bores, increasing the heat exchange area and quickly removing the compression heat of the high-pressure stage and the frictional heat of the oil-free piston assembly. This effectively controls the heat generated by friction in the high-pressure cylinder bores and components such as the high-pressure piston connecting rod within the high-pressure cylinder bores, reducing high-temperature wear of the friction pairs, ensuring the volumetric efficiency of the high-pressure stage, and extending the service life of the entire machine. Simultaneously, the annular second expansion chamber surrounds the outer side of the second cooling water channel. When the high-temperature compressed gas is transferred within the second expansion chamber, heat can be directly transferred through the cavity wall to the inner second cooling water channel, achieving indirect cooling of the gas inside the second expansion chamber. This further reduces the temperature of the compressed gas entering the high-pressure intake chamber, preventing overheating of the secondary compressed gas and reducing the overall exhaust temperature of the machine.

[0036] VI. In this utility model, the first expansion chamber is formed by the low-pressure cylinder head and the low-pressure valve plate. This utility model provides mutually spaced low-pressure heat dissipation columns on the side of the low-pressure cylinder head facing the low-pressure cylinder bore, which increases the heat exchange area between the low-pressure cylinder head and the first expansion chamber. The low-pressure heat dissipation columns can quickly absorb and dissipate the heat of the gas in the first expansion chamber.

[0037] VII. In this utility model, the axis of the low-pressure cylinder bore is set at a right angle to the axis of the high-pressure cylinder bore. This vertical layout provides space for the interstage air passage, expansion chamber, and cooling water passage, resulting in a compact overall structure and facilitating chassis layout. The reciprocating inertial forces of the pistons in the low-pressure and high-pressure cylinder bores can be partially offset, reducing overall machine vibration, lowering the risk of resonance, and improving overall machine reliability.

[0038] 8. In this utility model, the cavity of the high-pressure inner cavity has several spaced high-pressure heat dissipation columns inside, which are used to increase the heat exchange area between the cavity sidewall of the high-pressure inner cavity and the compressed gas inside the high-pressure inner cavity.

[0039] 9. In this utility model, the combination of the housing and the air-cooled motor is connected to the shock-absorbing pad through the mounting bracket. The shock-absorbing pad is usually made of elastic material, so that the connection between the combination of the housing and the air-cooled motor and the frame is elastic contact. The elastic contact can isolate the vibration generated by the operation of the V-type four-cylinder water-cooled oil-free air compressor from being transmitted to the frame, suppress the resonance between the V-type four-cylinder water-cooled oil-free air compressor and the frame, and reduce the risk of fastener loosening and air leakage failure. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the V-type four-cylinder water-cooled oil-free air compressor in Example 1;

[0041] Figure 2 yes Figure 1 A cross-sectional view from one perspective;

[0042] Figure 3 This is a schematic diagram of the low-pressure cylinder block in Example 1;

[0043] Figure 4 yes Figure 1 A cross-sectional view from another perspective;

[0044] Figure 5 This is a schematic diagram of the structure of the second expansion chamber in Example 1;

[0045] Figure 6 yes Figure 2 Cross-sectional views of different sections from the shown perspective;

[0046] Figure 7 This is a schematic diagram of the high-pressure heat dissipation column in Example 1;

[0047] Figure 8 This is a schematic diagram of the structure of the V-type four-cylinder water-cooled oil-free air compressor in Example 2.

[0048] The diagram shows: housing 1, air inlet 101, crankshaft assembly 102, low-pressure piston cylinder assembly 2, first expansion chamber 201, low-pressure cylinder block 202, low-pressure valve plate 203, low-pressure cylinder head 204, low-pressure piston connecting rod 205, low-pressure cylinder bore 206, water inlet connector 208, first cooling water channel 209, low-pressure heat dissipation column 210, high-pressure piston cylinder assembly 3, second expansion chamber 301, high-pressure air inlet chamber 302, high-pressure cylinder block 303, and high-pressure valve plate. 304, High-pressure cylinder head; 305, High-pressure piston connecting rod; 306, High-pressure cylinder bore; 307, High-pressure exhaust chamber; 308, Air outlet; 309, Second cooling water passage; 310, Water supply bolt; 311, Water supply channel; 312, High-pressure inner cavity; 313, Water outlet connector; 314, High-pressure heat dissipation column; 315, Interstage air passage; 4, Air-cooled motor; 5, Mounting bracket; 6, Vibration damping pad; 7, Water-cooled motor; 8, Water-cooled inlet; 801, Water-cooled outlet; 802, Water supply hose; 803. Detailed Implementation

[0049] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length h," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0050] Example 1

[0051] like Figures 1-3 As shown, a preferred embodiment of this utility model proposes a V-type four-cylinder water-cooled oil-free air compressor, which includes a housing 1 and a high-pressure piston cylinder assembly 3 and a low-pressure piston cylinder assembly 2 arranged in a V-shape on the housing 1. The low-pressure piston cylinder assembly 2 is provided with a first expansion chamber 201, and the high-pressure piston cylinder assembly 3 is provided with a second expansion chamber 301 and a high-pressure air intake chamber 302. An interstage air passage 4 is provided between the first expansion chamber 201 and the second expansion chamber 301. According to the flow direction of compressed air, the first expansion chamber 201, the interstage air passage 4, the second expansion chamber 301, and the high-pressure air intake chamber 302 are arranged and connected in sequence.

[0052] Preferably, the cross-sectional dimensions and shape of the interstage airway 4 are different from those of the first expansion chamber 201 and the second expansion chamber 301.

[0053] like Figures 1-4As shown, specifically, an air inlet 101 is provided on one side of the housing 1. The low-pressure piston cylinder assembly 2 includes a low-pressure cylinder body 202, a low-pressure valve plate 203, a low-pressure cylinder head 204, and a low-pressure piston connecting rod 205. Two low-pressure cylinder holes 206 are provided inside the low-pressure cylinder body 202. The low-pressure cylinder head 204 is fastened to the low-pressure cylinder body 202 and is integrally formed with the low-pressure cylinder body 202. A low-pressure valve plate 203 is provided between the low-pressure cylinder head 204 and the low-pressure cylinder body 202. The low-pressure cylinder head 204 and the low-pressure valve plate 205 are connected. 03 together restrict the formation of the first expansion chamber 201. A low-pressure check valve is provided on the low-pressure valve plate 203. The low-pressure check valve is used to unilaterally guide the low-pressure cylinder bore 206 toward the first expansion chamber 201. There are two low-pressure piston connecting rods 205. One low-pressure cylinder bore 206 corresponds to one low-pressure piston connecting rod 205. The low-pressure piston of the low-pressure piston connecting rod 205 can be movably inserted into the low-pressure cylinder bore 206. The low-pressure connecting rod of the low-pressure piston connecting rod 205 is rotatably connected to the crankshaft assembly 102 in the housing 1.

[0054] like Figure 1 , Figures 5-6 As shown, the high-pressure piston cylinder assembly 3 includes a high-pressure cylinder body 303, a high-pressure valve plate 304, a high-pressure cylinder head 305, and a high-pressure piston connecting rod 306. The high-pressure valve plate 304 is disposed between the high-pressure cylinder body 303 and the high-pressure cylinder head 305, and the high-pressure cylinder head 305, high-pressure valve plate 304, and high-pressure cylinder body 303 are detachably connected. Two high-pressure cylinder bores 307 are provided within the high-pressure cylinder body 303. The high-pressure cylinder head 305 and the high-pressure valve plate 304 together restrict the formation of a high-pressure intake chamber 302 and a high-pressure exhaust chamber 308. The high-pressure valve plate 304 is provided with a first high-pressure check valve, which is used to unidirectionally guide the high-pressure intake chamber 302 toward the high-pressure cylinder bores 307. The high-pressure valve plate 304 is also provided with a second high-pressure check valve, which is used to unidirectionally guide the high-pressure cylinder bores 307 toward the high-pressure exhaust chamber 308. The high-pressure cylinder block 303 has an outlet 309 on one side; there are two high-pressure piston connecting rods 306, with one high-pressure cylinder bore 307 corresponding to one high-pressure piston connecting rod 306. The high-pressure piston of the high-pressure piston connecting rod 306 can be movably inserted into the high-pressure cylinder bore 307, and the high-pressure connecting rod of the high-pressure piston connecting rod 306 is rotatably connected to the crankshaft assembly 102; the interstage air passage 4 is located inside the combination of the low-pressure cylinder block 202 and the high-pressure cylinder block 303. One end of the interstage air passage 4 is connected to the first expansion chamber 201, and the other end is connected to the second expansion chamber 301; the inlet 101, the low-pressure cylinder bore 206, the first expansion chamber 201, the interstage air passage 4, the second expansion chamber 301, the high-pressure inlet chamber 302, the high-pressure cylinder bore 307, the high-pressure exhaust chamber 308, and the outlet 309 are connected in sequence.

[0055] The volume of the first expansion chamber 201 has been increased compared to the prior art; for example, the volume of the first expansion chamber 201 is greater than or equal to 0.3L.

[0056] The cross-sectional dimension of the second expansion chamber 301 is larger than that of the interstage airway 4, and the volume of the second expansion chamber 301 is greater than or equal to 0.35L.

[0057] In use, when the first-stage compressed gas is discharged from the low-pressure one-way valve, it enters the first expansion chamber 201, at which point the first abrupt change in the gas flow cross section is formed. The gas then enters the interstage air passage 4 from the first expansion chamber 201, at which point the second abrupt change in the gas flow cross section is formed. The gas then enters the second expansion chamber 301 from the interstage air passage 4, at which point the third abrupt change in the gas flow cross section is formed. The gas then enters the high-pressure intake chamber 302 from the second expansion chamber 301, at which point the fourth abrupt change in the gas flow cross section is formed. The multiple abrupt changes in the gas flow cross section significantly consume the gas pulsation sound energy and effectively reduce gas pulsation noise.

[0058] As can be seen from the background technology, the existing technical problem is how to reduce the gas pulsation noise of oil-free air compressors.

[0059] In this embodiment, the gas flows sequentially through the first expansion chamber 201, the interstage air passage 4, the second expansion chamber 301, and the high-pressure intake chamber 302, resulting in multiple sudden changes in the flow cross section. The gas pulsation sound energy is dissipated, achieving resistance noise reduction and effectively reducing the airflow pulsation noise of the two-stage compression. This meets the low-noise requirements of the vehicle and solves the technical problems existing in the prior art.

[0060] Furthermore, in this embodiment, the noise reduction structure, namely the first expansion chamber 201, the interstage air passage 4, the second expansion chamber 301, and the high-pressure air intake chamber 302, are all integrated inside the cylinder body, eliminating the need for additional noise reduction parts and making reasonable and efficient use of the internal space of the air compressor.

[0061] In this embodiment, the interstage air passage 4 is located inside the combination of the low-pressure cylinder 202 and the high-pressure cylinder 303. This has the following advantages: First, it can reduce the number of external pipelines, connectors and other parts, simplify the assembly process of the whole machine, and reduce the cost of parts and the risk of leakage; Second, the built-in interstage air passage 4 shortens the gas transmission path between the high-pressure and low-pressure cylinders, reduces the pressure loss of gas along the path, and helps to improve the volumetric efficiency of two-stage compression; Third, the interstage air passage 4 is integrated inside the combination of the low-pressure cylinder 202 and the high-pressure cylinder 303, with a compact structure, occupies less external space, and helps to reduce the overall size of the air compressor.

[0062] The cooling structure of the V-type four-cylinder water-cooled oil-free air compressor in this embodiment is described below:

[0063] like Figures 1-3 , Figures 5-6As shown, a water inlet connector 208 is provided on one side of the low-pressure cylinder block 202, a first cooling water channel 209 is provided inside the low-pressure cylinder block 202, a second cooling water channel 310 is provided inside the high-pressure cylinder block 303, a water-passing bolt 311 is provided between the high-pressure valve plate 304 and the high-pressure cylinder head 305, and a water-passing channel 312 is provided on the water-passing bolt 311; a high-pressure inner cavity 313 is provided inside the high-pressure cylinder head 305, and a water outlet connector 314 is provided on one side of the high-pressure cylinder block 303; the water inlet connector 208, the first cooling water channel 209, and the second cooling water channel 310 are all present. Water channel 310, water passage 312, high-pressure inner cavity 313, and water outlet connector 314 are arranged and connected in sequence; the coolant in the high-pressure inner cavity 313 can exchange heat with the high-pressure air intake cavity 302 and the high-pressure exhaust cavity 308 at the same time; the first cooling water channel 209 is arranged in a ring and surrounds the first expansion chamber 201 and the two low-pressure cylinder bores 206; the second cooling water channel 310 is arranged in a ring and surrounds the two high-pressure cylinder bores 307, and the second expansion chamber 301 is arranged in a ring and surrounds the second cooling water channel 310.

[0064] In use, the coolant enters through the inlet connector 208, passes through the first cooling water channel 209, the second cooling water channel 310, the water passage 312, the high-pressure inner cavity 313, and finally flows out through the outlet connector 314.

[0065] Preferably, in terms of structural design, the cavity of the high-pressure inner cavity 313 is large enough to cover the high-pressure intake cavity 302 and the high-pressure exhaust cavity 308, thereby enabling sufficient heat exchange with the high-pressure intake cavity 302 and the high-pressure exhaust cavity 308.

[0066] In this embodiment, the coolant in the high-pressure inner cavity 313 can simultaneously exchange heat with the high-pressure intake cavity 302 and the high-pressure exhaust cavity 308, thereby achieving the maximum cooling efficiency of the high-pressure inner cavity 313.

[0067] In this embodiment, the first cooling water channel 209 is annular and surrounds the first expansion chamber 201 and the two low-pressure cylinder bores 206. The annular first cooling water channel 209 forms an encircling heat exchange cooling for the first expansion chamber 201 and the two low-pressure cylinder bores 206, increasing the heat exchange contact range, quickly removing the heat generated by the primary compressed gas, effectively controlling the working temperature of the low-pressure cylinder bores and the gas temperature of the primary compressed gas flowing in the first expansion chamber 201, reducing the heat generated by the reciprocating friction of the low-pressure piston connecting rod, and helping to extend the service life of the components.

[0068] In this embodiment, the second cooling water channel 310 is annular and surrounds the two high-pressure cylinder bores 307, and the second expansion chamber 301 is annular and surrounds the second cooling water channel 310. The high-pressure cylinder bores 307 are the secondary compression region with a higher compression ratio and greater heat generation. The annular second cooling water channel 310 can form a circumferential wrapping cooling of the high-pressure cylinder bores 307, increasing the heat exchange area and quickly removing the compression heat of the high-pressure stage and the frictional heat of the oil-free piston assembly. This effectively controls the heat generated by friction of the high-pressure cylinder bores 307 and components such as the high-pressure piston connecting rod within the high-pressure cylinder bores 307, reduces high-temperature wear of the friction pairs, ensures the volumetric efficiency of the high-pressure stage, and extends the service life of the entire machine. At the same time, the second expansion chamber 301 is annularly surrounding the outside of the second cooling water channel 310. When the high-temperature compressed gas is transferred within the second expansion chamber 301, the heat can be directly transferred to the inner second cooling water channel 310 through the cavity wall, achieving indirect cooling of the gas inside the second expansion chamber 301. This further reduces the temperature of the compressed gas entering the high-pressure intake chamber, avoids overheating of the secondary compressed gas, and reduces the overall exhaust temperature of the machine.

[0069] like Figure 4 As shown, further, in the V-type four-cylinder water-cooled oil-free air compressor of this embodiment, within the outline of the first expansion chamber 201, the low-pressure cylinder head 204 has a number of spaced low-pressure heat dissipation columns 210 on the side facing the low-pressure cylinder bore 206.

[0070] In this embodiment, the first expansion chamber 201 is formed by the low-pressure cylinder head 204 and the low-pressure valve plate 203. In this embodiment, low-pressure heat dissipation columns 210 are provided on the side of the low-pressure cylinder head 204 facing the low-pressure cylinder bore 206, which increases the heat exchange area between the low-pressure cylinder head 204 and the first expansion chamber 201. The low-pressure heat dissipation columns 210 can quickly absorb and dissipate the heat of the gas in the first expansion chamber 201.

[0071] In this embodiment, the axis of the low-pressure cylinder bore 206 is set at a right angle to the axis of the high-pressure cylinder bore 307. This vertical layout provides space for the interstage air passage, expansion chamber, and cooling water passage, resulting in a compact overall structure and facilitating chassis layout. The reciprocating inertial forces of the pistons in the low-pressure cylinder bore 206 and the high-pressure cylinder bore 307 can be partially offset, reducing overall machine vibration, lowering the risk of resonance, and improving overall machine reliability.

[0072] like Figure 7 As shown, in this embodiment, the high-pressure inner cavity 313 has several spaced high-pressure heat dissipation columns 315 inside the cavity, which are used to increase the heat exchange area between the cavity sidewall of the high-pressure inner cavity 313 and the compressed gas inside the high-pressure inner cavity 313.

[0073] Furthermore, the V-type four-cylinder water-cooled oil-free air compressor also includes an air-cooled motor 5, which is installed on one side of the housing 1. The output shaft of the air-cooled motor 5 is used to drive the crankshaft assembly 102 to rotate synchronously. It also includes a mounting bracket 6 and a shock-absorbing pad 7. The combination of the housing 1 and the air-cooled motor 5 is connected to the shock-absorbing pad 7 through the mounting bracket 6.

[0074] The air-cooled motor 5 is installed on one side of the housing 1 to accelerate the airflow around the low-pressure piston cylinder assembly 2 and the high-pressure piston cylinder assembly 3, and quickly dissipate heat from the low-pressure piston cylinder assembly 2 and the high-pressure piston cylinder assembly 3.

[0075] The assembly of housing 1 and air-cooled motor 5 is connected to shock-absorbing pad 7 via mounting bracket 6. The shock-absorbing pad 7 is usually made of elastic material, so that the connection between the assembly of housing 1 and air-cooled motor 5 and the frame is elastic contact. The elastic contact can isolate the vibration generated by the operation of the V-type four-cylinder water-cooled oil-free air compressor from being transmitted to the frame, suppress the resonance between the V-type four-cylinder water-cooled oil-free air compressor and the frame, and reduce the risk of fastener loosening and air leakage failure.

[0076] Example 2

[0077] The V-type four-cylinder water-cooled oil-free air compressor in this embodiment is largely the same as the V-type four-cylinder water-cooled oil-free air compressor in Embodiment 1. The difference from Embodiment 1 is that the air-cooled motor 5 in Embodiment 1 is replaced with a water-cooled motor 8, and the corresponding water channel structure is modified.

[0078] like Figure 8 As shown, specifically, the V-type four-cylinder water-cooled oil-free air compressor of this embodiment also includes a water-cooled motor 8 and a water hose 803. The water-cooled motor 8 is located on one side of the housing 1, and the output shaft of the water-cooled motor 8 is used to drive the crankshaft assembly 102 to rotate synchronously. A water-cooled inlet 801 and a water-cooled outlet 802 are provided on the outer side of the housing of the water-cooled motor 8. The water-cooled inlet 801, water-cooled outlet 802, water hose 803, water inlet connector 208, first cooling water channel 209, second cooling water channel 310, water passage 312, high-pressure inner cavity 313, and water outlet connector 314 are arranged and connected in sequence.

[0079] The internal structure of the water-cooled motor 8 is existing technology and will not be described in detail here.

[0080] Compared to the air-cooled motor 5, the water-cooled motor 8 has lower heat dissipation noise, avoiding the rotational noise source caused by the cooling fan of the air-cooled motor 5, and is more suitable for the low-noise installation requirements of new energy commercial vehicles.

[0081] Example 3

[0082] This embodiment proposes a new energy vehicle, which includes the V-type four-cylinder water-cooled oil-free air compressor as described in Embodiment 1 or Embodiment 2.

[0083] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A V-type four-cylinder water-cooled oil-free air compressor, characterized in that, It includes a housing (1) and a high-pressure piston cylinder assembly (3) and a low-pressure piston cylinder assembly (2) arranged in a V-shape on the housing (1). The low-pressure piston cylinder assembly (2) is provided with a first expansion chamber (201), and the high-pressure piston cylinder assembly (3) is provided with a second expansion chamber (301) and a high-pressure air inlet chamber (302). An interstage air passage (4) is provided between the first expansion chamber (201) and the second expansion chamber (301). The first expansion chamber (201), the interstage air passage (4), the second expansion chamber (301), and the high-pressure air inlet chamber (302) are arranged and connected in sequence according to the flow direction of compressed air.

2. The V-type four-cylinder water-cooled oil-free air compressor according to claim 1, characterized in that, The cross-sectional dimensions and shape of the interstage airway (4) are different from those of the first expansion chamber (201) and the second expansion chamber (301).

3. The V-type four-cylinder water-cooled oil-free air compressor according to claim 1 or 2, characterized in that, An air inlet (101) is provided on one side of the housing (1). The low-pressure piston cylinder assembly (2) includes a low-pressure cylinder body (202), a low-pressure valve plate (203), a low-pressure cylinder head (204), and a low-pressure piston connecting rod (205). Two low-pressure cylinder holes (206) are provided in the low-pressure cylinder body (202). The low-pressure cylinder head (204) is fastened to the low-pressure cylinder body (202). The low-pressure cylinder head (204) and the low-pressure cylinder body (202) are integrally formed. The low-pressure valve plate (203) is provided between the low-pressure cylinder head (204) and the low-pressure cylinder body (202). The low-pressure cylinder head (204) and the low-pressure valve plate (203) together restrict the formation of the first expansion chamber (201). A low-pressure check valve is provided on the low-pressure valve plate (203). The low-pressure check valve is used to unidirectionally guide the low-pressure cylinder holes (206) toward the first expansion chamber (201). There are two low-pressure piston connecting rods (205), one low-pressure cylinder bore (206) corresponds to one low-pressure piston connecting rod (205), the low-pressure piston of the low-pressure piston connecting rod (205) can be movably inserted into the low-pressure cylinder bore (206), and the low-pressure connecting rod of the low-pressure piston connecting rod (205) is rotatably connected to the crankshaft assembly (102) in the housing (1); The high-pressure piston cylinder assembly (3) includes a high-pressure cylinder body (303), a high-pressure valve plate (304), a high-pressure cylinder head (305), and a high-pressure piston connecting rod (306). The high-pressure valve plate (304) is disposed between the high-pressure cylinder body (303) and the high-pressure cylinder head (305). The high-pressure cylinder head (305), the high-pressure valve plate (304), and the high-pressure cylinder body (303) are detachably connected. Two high-pressure cylinder holes (307) are provided inside the high-pressure cylinder body (303). The high-pressure cylinder head (305) and the high-pressure valve plate (306) are connected together. 304) Together they restrict the formation of a high-pressure intake chamber (302) and a high-pressure exhaust chamber (308); the high-pressure valve plate (304) is provided with a first high-pressure check valve, which is used to unidirectionally guide the high-pressure intake chamber (302) toward the high-pressure cylinder bore (307); the high-pressure valve plate (304) is also provided with a second high-pressure check valve, which is used to unidirectionally guide the high-pressure cylinder bore (307) toward the high-pressure exhaust chamber (308); an exhaust port (309) is provided on one side of the high-pressure cylinder body (303); There are two high-pressure piston connecting rods (306), one high-pressure cylinder bore (307) corresponds to one high-pressure piston connecting rod (306), the high-pressure piston of the high-pressure piston connecting rod (306) can be movably inserted into the high-pressure cylinder bore (307), and the high-pressure connecting rod of the high-pressure piston connecting rod (306) is rotatably connected to the crankshaft assembly (102); Interstage air passage (4) is disposed inside the combination of low-pressure cylinder block (202) and high-pressure cylinder block (303). One end of the interstage air passage (4) is connected to the first expansion chamber (201), and the other end is connected to the second expansion chamber (301). The air inlet (101), low-pressure cylinder bore (206), first expansion chamber (201), interstage air passage (4), second expansion chamber (301), high-pressure air inlet chamber (302), high-pressure cylinder bore (307), high-pressure exhaust chamber (308), and air outlet (309) are connected in sequence.

4. The V-type four-cylinder water-cooled oil-free air compressor according to claim 3, characterized in that, A water inlet connector (208) is provided on one side of the low-pressure cylinder block (202), a first cooling water channel (209) is provided inside the low-pressure cylinder block (202), a second cooling water channel (310) is provided inside the high-pressure cylinder block (303), a water-passing bolt (311) is provided between the high-pressure valve plate (304) and the high-pressure cylinder head (305), and a water-passing channel (312) is provided on the water-passing bolt (311); a high-pressure inner cavity (313) is provided inside the high-pressure cylinder head (305), and a water outlet connector (314) is provided on one side of the high-pressure cylinder block (303); The water inlet connector (208), the first cooling water channel (209), the second cooling water channel (310), the water passage (312), the high-pressure inner cavity (313), and the water outlet connector (314) are arranged and connected in sequence; The coolant in the high-pressure inner cavity (313) can exchange heat with the high-pressure intake cavity (302) and the high-pressure exhaust cavity (308) at the same time; The first cooling water passage (209) is annular and surrounds the first expansion chamber (201) and the two low-pressure cylinder bores (206); The second cooling water channel (310) is annular and surrounds the two high-pressure cylinder bores (307), and the second expansion chamber (301) is annular and surrounds the second cooling water channel (310).

5. The V-type four-cylinder water-cooled oil-free air compressor according to claim 3, characterized in that, Within the outline of the first expansion chamber (201), the low-pressure cylinder head (204) has several spaced low-pressure heat dissipation columns (210) on the side facing the low-pressure cylinder bore (206).

6. The V-type four-cylinder water-cooled oil-free air compressor according to claim 3, characterized in that, The axis of the low-pressure cylinder bore (206) is set at a right angle to the axis of the high-pressure cylinder bore (307).

7. The V-type four-cylinder water-cooled oil-free air compressor according to claim 4, characterized in that, The cavity of the high-pressure inner cavity (313) has several high-pressure heat dissipation columns (315) arranged at intervals.

8. The V-type four-cylinder water-cooled oil-free air compressor according to claim 4, characterized in that, It also includes an air-cooled motor (5), which is installed on one side of the housing (1). The output shaft of the air-cooled motor (5) is used to drive the crankshaft assembly (102) to rotate synchronously. It also includes a mounting bracket (6) and a shock-absorbing pad (7), and the combination of the housing (1) and the air-cooled motor (5) is connected to the shock-absorbing pad (7) via the mounting bracket (6).

9. The V-type four-cylinder water-cooled oil-free air compressor according to claim 4, characterized in that, It also includes a water-cooled motor (8) and a water hose (803). The water-cooled motor (8) is located on one side of the housing (1). The output shaft of the water-cooled motor (8) is used to drive the crankshaft assembly (102) to rotate synchronously. The water-cooled motor (8) has a water-cooled inlet (801) and a water-cooled outlet (802) on the outside of its casing. The water-cooled inlet (801), water-cooled outlet (802), water hose (803), water inlet connector (208), first cooling water channel (209), second cooling water channel (310), water channel (312), high-pressure inner cavity (313), and water outlet connector (314) are arranged and connected in sequence.

10. A new energy vehicle, characterized in that, Including the V-type four-cylinder water-cooled oil-free air compressor as described in any one of claims 1-9.

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