Oiled two-stage air compressor and vehicle

Abstract

The utility model discloses an oiled two-stage air compressor and a vehicle. The oiled two-stage air compressor comprises an oil pump, a crankshaft, a low-pressure piston connecting rod assembly and a high-pressure piston connecting rod assembly, wherein the crankshaft is used for connecting the oil pump with a power device in a transmission manner; when the oiled two-stage air compressor is in a running state, the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly are driven by the crankshaft to do reciprocating motion, and the contact faces, connected with the crankshaft, of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly are provided with lubricating oil sucked through an oil pump. The two-stage supercharging structure is adopted, external lubricating oil pipes are removed, meanwhile, the crankcase and the oil tank are designed in an integrated mode, and therefore sealing faces are reduced, the pipeline leakage risk is effectively reduced, and high efficiency and saving are achieved.

Description

Technical Field

[0001] The utility model belongs to the field of air compressors, and in particular relates to an oil-containing two-stage air compressor and a vehicle. Background Art

[0002] An air compressor is a device that generates air pressure for compressed air. The difference between an oil-filled air compressor and an oil-free air compressor is that lubricating oil is present during operation. The lubricating oil during operation can reduce the wear caused by friction inside the air compressor, thereby extending the life of the air compressor.

[0003] However, existing automotive oil compressors basically adopt a single-stage two-cylinder structure, with low compression efficiency; they are equipped with a large number of external oil pipes, which are easily affected by external forces or body vibration during use; the power unit and the compressor are separate components and are connected with a coupling, which leads to more sealing surfaces and prone to leakage, especially at the external oil pipes, where the risk of leakage is high. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides an oil-containing two-stage air compressor and a vehicle.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] In a first aspect, an oil-containing two-stage air compressor is provided, comprising:

[0007] Oil pump;

[0008] A crankshaft drivingly connecting the oil pump to the power unit;

[0009] a low-pressure piston connecting rod assembly for initially compressing air and connected to the crankshaft;

[0010] A high-pressure piston connecting rod assembly for re-compressing air and connected to the crankshaft; and

[0011] The low-pressure piston connecting rod assembly, the high-pressure piston connecting rod assembly and the crankshaft constitute a reciprocating mechanism that causes the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly to reciprocate, wherein the crankshaft serves as a power supply part of the reciprocating mechanism;

[0012] When the oil-containing two-stage air compressor is in operation, the contact surfaces of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly connected to the crankshaft have lubricating oil sucked by the oil pump.

[0013] In certain embodiments, oil channel seals are used at a maximum of three sealing contact surfaces of the oil-filled two-stage air compressor.

[0014] In some embodiments, the oil-containing two-stage air compressor further comprises:

[0015] A piston cylinder, comprising a cylinder head with a safety valve, an air inlet connector and an exhaust connector; and

[0016] A valve plate, the outer periphery of which is sealingly connected to the inner wall of the piston cylinder;

[0017] Among them, the area formed by the inner wall of the piston cylinder, the bottom of the cylinder cover of the piston cylinder and the top of the valve plate constitutes a gas channel of the oil-containing two-stage air compressor, and the air inlet joint and the exhaust joint of the piston cylinder are connected to the interior of the piston cylinder through the gas channel.

[0018] In some embodiments, the oil pump comprises:

[0019] An oil pump shaft drivingly connected to the crankshaft; and

[0020] The lubricating oil is sucked into the pump oil passage of the contact surface where the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly are connected to the crankshaft.

[0021] In certain embodiments, the crankshaft comprises:

[0022] a shaft oil passage communicating with a pump oil passage of an oil pump; and

[0023] a bearing bushing connected to the rear section of the shaft oil passage;

[0024] The shaft oil passage is communicated with the contact surfaces of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly connected to the crankshaft.

[0025] In some embodiments, the low-pressure piston-connecting rod assembly and the high-pressure piston-connecting rod assembly have the same structure, both comprising a connecting rod end connected to the crankshaft and a piston end circumferentially sealed with the inner wall of the corresponding piston cylinder;

[0026] The connecting rod ends of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly are both split connecting rods.

[0027] In some embodiments, the oil-containing two-stage air compressor further comprises a crankcase for storing lubricating oil, and the crankcase comprises:

[0028] Sloping bottom wall;

[0029] An oil drain port for discharging sludge from the lowest point of the bottom wall;

[0030] A dipstick to observe lubricating oil levels; and

[0031] The filter screen has an outer periphery connected to the side wall inside the crankcase and is located between the crankshaft and the bottom wall of the crankcase.

[0032] In some embodiments, the oil-containing two-stage air compressor further comprises:

[0033] A first shock-absorbing pad is disposed at the bottom of the crankcase; and

[0034] A second shock-absorbing pad is arranged on a mounting plate connected to the power device;

[0035] The bottoms of the first shock-absorbing pad and the second shock-absorbing pad are both provided with transition plates for facilitating installation of the entire vehicle.

[0036] In certain embodiments, the crankcase further includes an exhaust gas pipeline for discharging exhaust gas, and the exhaust gas pipeline is provided with a one-way valve for preventing impurities from entering.

[0037] In certain embodiments, the oil-filled two-stage air compressor further includes a fan assembly and cooling fins for cooling.

[0038] In a second aspect, a vehicle is provided, comprising: the oil-containing two-stage air compressor.

[0039] The beneficial effects of the utility model are as follows: the utility model adopts a two-stage supercharging structure to achieve the requirements of high efficiency and high pressure; the utility model eliminates various external lubricating oil pipes (including an oil suction pipe, an oil outlet pipe, and an oil return pipe), and integrates the crankcase and the oil tank into an integrated design, thereby reducing the sealing surface, effectively reducing the risk of pipeline leakage of the utility model and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 It is a vertical cross-sectional view of an oil-containing two-stage air compressor provided in one embodiment of the utility model;

[0042] Figure 2 It is an elevation view of an oil-containing two-stage air compressor provided in one embodiment of the utility model;

[0043] Figure 3 A plan cross-sectional view of an oil-containing two-stage air compressor provided in one embodiment of the utility model;

[0044] Figure 4 A plan view of an oil-containing two-stage air compressor provided in one embodiment of the utility model;

[0045] Figure 5 This is a schematic diagram of the structure of a crankshaft in one embodiment of the utility model;

[0046] Figure 6 The utility model is a schematic structural diagram of the connecting rod ends of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly in one embodiment. DETAILED DESCRIPTION

[0047] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 As shown, the oil-containing two-stage air compressor comprises: an oil pump 10, a crankshaft 20 that drives the oil pump 10 and a power device 1001, a low-pressure piston connecting rod assembly 30 for initially compressing air, and a high-pressure piston connecting rod assembly 40 for re-compressing air. The low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are both connected to the crankshaft 20. In one embodiment, the power device 1001 is a motor.

[0049] When the oil-containing two-stage air compressor is in operation, the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 reciprocate driven by the crankshaft 20, and the contact surfaces of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 connected to the crankshaft 20 have lubricating oil sucked by the oil pump 10.

[0050] like Figure 1 As shown, in one embodiment, in order to reduce the sealing surface and effectively reduce the risk of pipeline leakage, the oil channel seal 1002 is used at a maximum of three sealing contact surfaces of the oil-containing two-stage air compressor.

[0051] In one embodiment, the oil channel seals 1002 used in three places include a first oil seal 1002a at the seal between the oil pump 10 and the crankcase 90, a second oil seal 1002b at the seal between the power unit 1001 and the crankcase 90, and a third oil seal 1002c between the piston cylinder 60 and the crankcase 90.

[0052] Specifically, compared with the original oil-containing air compressor, the oil-containing two-stage air compressor eliminates various external lubricating oil pipes (including the oil suction pipe 1021, the oil outlet pipe, and the oil return pipe), reduces the seals required due to the joint surfaces of the external oil pipes, and uses oil channel seals 1002 at a maximum of three sealing contact surfaces, and the rest use air path seals.

[0053] like Figure 1 As shown, in one embodiment, the oil pump 10 includes an oil pump shaft 101 drivingly connected to the crankshaft 20 and a pump oil passage 102 for sucking lubricating oil into the contact surface where the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are connected to the crankshaft 20. In one embodiment, the pump oil passage 102 includes an oil suction pipe 1021 at least partially immersed in the lubricating oil, an oil outlet passage 1022 communicating with the shaft oil passage 201 of the crankshaft 20, and an oil suction passage 1023 communicating the oil suction pipe 1021 with the oil outlet passage 1022.

[0054] Specifically, the lubricating oil enters the shaft oil passage 201 of the crankshaft 20 through the pump oil passage 102 of the oil pump 10, and finally enters the contact surface where the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are connected to the crankshaft 20. During the flow of the lubricating oil, it does not pass through the area of ​​compressed air in the piston cylinder 60, that is, the air circuit and the oil circuit are separated, so there is no need to worry about the oil circuit and the air circuit being mutually leaked (the original air circuit and oil circuit of the air compressor are the same circuit that are not separated, and the high-pressure and high-temperature compressed gas can easily cause the above-mentioned circuit to be poorly sealed, thereby causing oil leakage from the air compressor), thereby ensuring better sealing of the air circuit.

[0055] like Figure 1 and Figure 5 As shown, in one embodiment, the crankshaft 20 includes an axial oil passage 201 communicating with the pump oil passage 102 of the oil pump 10 and a bearing 202 communicating with the tail section of the axial oil passage 201. The axial oil passage 201 of the crankshaft 20 is communicated with the contact surface where the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are connected to the crankshaft 20.

[0056] Specifically, when the oil-containing two-stage air compressor is working, the operation of the power device 1001 drives the crankshaft 20 to operate, and then drives the oil pump shaft 101 of the oil pump 10 to operate. The operation of the oil pump shaft 101 of the oil pump 10 forms a vacuum inside the oil pump 10, so that the lubricating oil is discharged into the shaft oil passage 201 of the crankshaft 20 through the pump oil passage 102 of the oil pump 10, and then lubricates the contact surface of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 connected to the crankshaft 20, and finally flows to the bearing 202 of the crankshaft 20 for discharge.

[0057] like Figure 1 and Figure 6 As shown, in one embodiment, the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 have the same structure, both including a connecting rod end 501 connected to the crankshaft 20 and a piston end 502 circumferentially sealed with the inner wall of the corresponding piston cylinder 60; the connecting rod ends 501 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are both split connecting rods.

[0058] In one embodiment, the connecting rod ends 501 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 each include a connecting rod small end 5011 , a bolt 5012 , and a connecting rod large end 5013 connected to the connecting rod small end 5011 via the bolt 5012 .

[0059] In one embodiment, the piston ends 502 of the low-pressure piston-connecting rod assembly 30 and the high-pressure piston-connecting rod assembly 40 have gas rings and oil rings, and both of them are metal parts.

[0060] In one embodiment, in order to facilitate the return of the lubricating oil scraped off by the oil rings of the piston ends 502 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 to the piston cylinder 60, oil holes are provided at the oil ring mounting locations of the piston ends 502 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40.

[0061] like Figure 5 As shown, in one embodiment, because the connecting rod ends 501 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are both split connecting rods, the crankshaft 20 can be provided with different numbers of cranks 203 and balance blocks 204 according to specific needs.

[0062] Specifically, the connecting rod ends 501 of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 are of a split type, so that the crankshaft 20 does not affect its installation (the original oil-free air compressor uses a bearing sleeve on the connecting rod, and the bearing sleeve is mounted on the crankshaft to realize the operation of the crankshaft driving the connecting rod. Because the bearing needs to be pressed, it is impossible to set a corner on the crankshaft), so the crankshaft 20 can be set with different numbers of cranks 203 and balance blocks 204 according to specific needs.

[0063] like Figure 1-Figure 4 As shown, the oil-containing two-stage air compressor further includes a piston cylinder 60 and a valve plate 70. The piston cylinder 60 includes a cylinder head 601 having a safety valve 6011, an air inlet joint 602 and an air outlet joint 603; the periphery of the valve plate 70 is sealedly connected to the inner wall of the piston cylinder 60. The area formed by the inner wall of the piston cylinder 60, the bottom of the cylinder head 601 of the piston cylinder 60 and the top of the valve plate 70 constitutes a gas channel 80 of the oil-containing two-stage air compressor, and the air inlet joint 602 of the piston cylinder 60 and the air outlet joint 603 of the piston cylinder 60 are connected to the inside of the piston cylinder 60 through the gas channel 80.

[0064] Specifically, when the oil-containing two-stage air compressor is in operation, the power device 1001 drives the crankshaft 20 to operate, and the operation of the crankshaft 20 drives the low-pressure piston connecting rod assembly 30 to move downward, and the suction force generated by the low-pressure piston connecting rod assembly 30 allows the gas to enter the air channel through the air intake joint 602, and then enter the piston cylinder 60 from the air channel; the crankshaft 20 continues to operate to drive the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 to reciprocate, and the air in the piston cylinder 60 is compressed for the first time by the low-pressure piston connecting rod assembly 30 and for the second time by the high-pressure piston connecting rod assembly 40 in turn. After the compression is completed, the gas enters the air channel again, and is finally discharged through the exhaust joint 603 of the piston cylinder 60.

[0065] In one embodiment, the valve plate 70 has a low-pressure air inlet hole 701 , a low-pressure air outlet hole 702 , a high-pressure air inlet hole 703 , and a high-pressure air outlet hole 704 that penetrate the top and bottom of the valve plate 70 in sequence.

[0066] In one embodiment, the gas channel 80 is divided into a low-pressure air inlet chamber 801 , a low-pressure air exhaust chamber 802 , a high-pressure air inlet chamber 803 , a high-pressure air exhaust chamber 804 , and an air passage 805 connecting the low-pressure air exhaust chamber 802 and the high-pressure air inlet chamber 803 .

[0067] In one embodiment, the low-pressure air inlet chamber 801 is connected to the air inlet joint 602, and the high-pressure air exhaust chamber 804 is connected to the air exhaust joint 603; the area formed by the top of the piston end 502 of the low-pressure piston connecting rod assembly 30, the inner wall of the piston cylinder 60 and the bottom of the valve plate 70 constitutes a low-pressure compression chamber 301, and the low-pressure compression chamber 301 is connected to the low-pressure air inlet chamber 801 through the low-pressure air inlet hole 701 of the valve plate 70, and it is connected to the low-pressure exhaust chamber 802 through the low-pressure exhaust hole 702 of the valve plate 70; the area formed by the top of the piston end 502 of the high-pressure piston connecting rod assembly 40, the inner wall of the piston cylinder 60 and the bottom of the valve plate 70 constitutes a high-pressure compression chamber 401, and the high-pressure compression chamber 401 is connected to the high-pressure air inlet chamber 803 through the high-pressure air inlet hole 703 of the valve plate 70, and it is connected to the high-pressure exhaust chamber 804 through the high-pressure exhaust hole 704 of the valve plate 70.

[0068] Specifically, the safety valve 6011 on the cylinder head 601 of the piston cylinder 60 prevents the oil-containing two-stage air compressor from being blocked and forming a high pressure after being connected to the vehicle pipeline. When the oil-containing two-stage air compressor is working, the power device 1001 drives the crankshaft 20 to operate, and the operation of the crankshaft 20 drives the low-pressure piston connecting rod assembly 30 to move downward. The suction force generated by the low-pressure piston connecting rod assembly 30 allows the gas to enter the low-pressure intake chamber 801 through the intake joint 602, and then enter the low-pressure compression chamber 301 through the low-pressure intake hole 701 on the valve plate 70; then, when the crankshaft 20 operates to drive the low-pressure piston connecting rod assembly 30 upward, the gas will enter the low-pressure intake chamber 801 through the intake joint 602. , the gas in the low-pressure compression chamber 301 is compressed for the first time, and the gas after the first compression enters the low-pressure exhaust chamber 802 through the low-pressure exhaust hole 702 on the valve plate 70, and then enters the high-pressure intake chamber 803 through the air passage 805, and then enters the high-pressure compression chamber 401 through the high-pressure intake hole 703 on the valve plate 70; when the crankshaft 20 rotates and drives the high-pressure piston connecting rod assembly 40 upward, the gas after the first compression is compressed for the second time, and the gas after the second compression enters the high-pressure exhaust chamber 804 through the high-pressure exhaust hole 704 on the valve plate 70, and is finally discharged to the outside through the exhaust joint 603.

[0069] like Figure 1As shown, in one embodiment, the oil-containing two-stage air compressor further includes a crankcase 90 for storing lubricating oil. In order to facilitate the discharge of the oil sludge inside the crankcase 90, the crankcase 90 has a sloped bottom wall 901 and an oil drain port 902 for discharging the oil sludge from the lowest point of the bottom wall 901; in order to facilitate checking whether the lubricating oil inside the crankcase 90 is sufficient, the crankcase 90 has an oil dipstick 903 for observing the lubricating oil capacity inside the crankcase 90; in order to prevent the impurities generated by the wear caused by the friction between the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 and the piston cylinder 60 during operation from directly entering the lubricating oil, the crankcase 90 has a filter screen 904, the outer periphery of which is connected to the side wall inside the crankcase 90 and is located between the crankshaft 20 and the bottom wall 901 of the crankcase 90.

[0070] Specifically, the lubricating oil lubricates the contact surface between the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 and the crankshaft 20, flows to the bearing 202 and is discharged, and is filtered through the filter 904 of the crankcase 90 and then recycled into the crankcase 90 for recycling. The slope and the oil drain port 902 ensure that the sludge precipitated by the lubricating oil used multiple times can be easily discharged to protect the performance of the lubricating oil; the oil dipstick 903 observes the lubricating oil capacity inside the crankcase 90 to prevent the lubricating oil from being too little and affecting the normal operation of the oil-containing two-stage air compressor; the filter 904 filters out impurities caused by wear caused by friction between the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 and the piston cylinder 60 during operation, and prevents impurities from entering the contact surface between the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 and the crankshaft 20 through the lubricating oil again, causing damage to the components.

[0071] like Figure 2 and Figure 4 As shown, in one embodiment, in order to effectively reduce the vibration of the oil-containing two-stage air compressor after operation and transmit it to the whole vehicle, the oil-containing two-stage air compressor also includes a first shock-absorbing pad 1003a and a second shock-absorbing pad 1003b. The first shock-absorbing pad 1003a is arranged at the bottom of the crankcase 90; the second shock-absorbing pad 1003b is on the mounting plate 1004 connected to the power device 1001. In one embodiment, in order to facilitate the installation of the whole vehicle, the bottoms of the first shock-absorbing pad 1003a and the second shock-absorbing pad 1003b are both provided with a transition plate 1005.

[0072] like Figure 4 As shown, in one embodiment, in order to discharge the exhaust gas inside the oil-containing two-stage air compressor, the crankcase 90 also has an exhaust gas pipeline 1006; in order to prevent impurities from entering the oil-containing two-stage air compressor through the exhaust gas pipeline 1006, a one-way valve 1007 is provided on the exhaust gas pipeline 1006.

[0073] like Figure 2 and Figure 4As shown, in one embodiment, in order to prevent the oil-containing two-stage air compressor from having an excessively high body temperature when the compressor is in operation, the oil-containing two-stage air compressor further includes a fan assembly 1008 and cooling fins 1009 for cooling. In one embodiment, the fan assembly 1008 is disposed on the crankcase 90. In one embodiment, the cooling fins 1009 include a first fin 1009a disposed on the crankcase 90, a second fin 1009b disposed on the piston cylinder 60, and a third fin 1009c disposed on the cylinder head 601.

[0074] The workflow of this utility model is as follows:

[0075] When the oil-containing two-stage air compressor is in operation, the power device 1001 drives the crankshaft 20 to operate, and the operation of the crankshaft 20 drives the low-pressure piston connecting rod assembly 30 to move downward, and the suction force generated by the low-pressure piston connecting rod assembly 30 allows the gas to enter the air channel through the air intake joint 602, and then enter the piston cylinder 60 from the air channel; the crankshaft 20 continues to operate to drive the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 to reciprocate, and the air in the piston cylinder 60 is compressed for the first time by the low-pressure piston connecting rod assembly 30 and for the second time by the high-pressure piston connecting rod assembly 40 in turn. After the compression is completed, the gas enters the air channel again, and is finally discharged through the exhaust joint 603 of the piston cylinder 60.

[0076] At the same time, the operation of the power unit 1001 drives the crankshaft 20 to operate, and the crankshaft 20 drives the oil pump shaft 101 of the oil pump 10 to operate. The operation of the oil pump shaft 101 of the oil pump 10 forms a vacuum inside the oil pump 10, thereby discharging the lubricating oil in the crankcase 90 through the pump oil passage 102 of the oil pump 10 to the shaft oil passage 201 of the crankshaft 20, thereby lubricating the contact surfaces of the low-pressure piston connecting rod assembly 30 and the high-pressure piston connecting rod assembly 40 connected to the crankshaft 20, and finally flows to the bearing 202 of the crankshaft 20 for discharge. The discharged lubricating oil is then filtered through the filter screen 904 of the crankcase 90 and then recovered and stored in the crankcase 90 for recycling.

[0077] The above description is merely a preferred embodiment of one or more embodiments of the present specification and is not intended to limit one or more embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present specification shall be included in the scope of protection of one or more embodiments of the present specification.

Claims

1. An oil-containing two-stage air compressor, characterized in that: include: Oil pump; A crankshaft drivingly connecting the oil pump to the power unit; a low-pressure piston connecting rod assembly for initially compressing air and connected to the crankshaft; a high-pressure piston connecting rod assembly for re-compressing air and connected to the crankshaft; as well as The low-pressure piston connecting rod assembly, the high-pressure piston connecting rod assembly and the crankshaft constitute a reciprocating mechanism that causes the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly to reciprocate, wherein the crankshaft serves as a power supply part of the reciprocating mechanism; When the oil-containing two-stage air compressor is in operation, the contact surfaces of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly connected to the crankshaft have lubricating oil sucked by the oil pump.

2. The oil-free two-stage air compressor according to claim 1, characterized in that: The oil-filled two-stage air compressor has oil channel seals at a maximum of three sealing contact surfaces.

3. The oil-free two-stage air compressor according to claim 1, characterized in that: The oil-containing two-stage air compressor also includes: A piston cylinder, comprising a cylinder head with a safety valve, an air inlet connector and an exhaust connector; and A valve plate, the outer periphery of which is sealingly connected to the inner wall of the piston cylinder; Among them, the area formed by the inner wall of the piston cylinder, the bottom of the cylinder cover of the piston cylinder and the top of the valve plate constitutes the gas channel of the oil-containing two-stage air compressor, and the air inlet joint of the piston cylinder and the exhaust joint of the piston cylinder are connected to the interior of the piston cylinder through the gas channel.

4. The oil-filled two-stage air compressor according to claim 1, characterized in that: The oil pump comprises: An oil pump shaft drivingly connected to the crankshaft; and The lubricating oil is sucked into the pump oil passages of the contact surfaces of the low-pressure piston-connecting rod assembly and the high-pressure piston-connecting rod assembly connected to the crankshaft.

5. The oil-filled two-stage air compressor according to claim 4, characterized in that: The crankshaft comprises: a shaft oil passage communicating with a pump oil passage of the oil pump; and a bearing bushing in communication with the tail section of the shaft oil passage; The shaft oil passage is in communication with the contact surface where the low-pressure piston-connecting rod assembly and the high-pressure piston-connecting rod assembly are connected to the crankshaft.

6. The oil-filled two-stage air compressor according to claim 3, characterized in that: The low-pressure piston-connecting rod assembly and the high-pressure piston-connecting rod assembly have the same structure, and both include a connecting rod end connected to the crankshaft and a piston end circumferentially sealed with the inner wall of the corresponding piston cylinder; The connecting rod ends of the low-pressure piston connecting rod assembly and the high-pressure piston connecting rod assembly are both split connecting rods.

7. The oil-free two-stage air compressor according to claim 1, characterized in that: The oil-containing two-stage air compressor also includes a crankcase for storing lubricating oil, and the crankcase includes: Sloping bottom wall; an oil drain port for discharging the sludge from the lowest point of the bottom wall; A dipstick to observe lubricating oil levels; and The filter screen has an outer periphery connected to the side wall inside the crankcase and is located between the crankshaft and the bottom wall of the crankshaft.

8. The oil-filled two-stage air compressor according to claim 7, characterized in that: The oil-containing two-stage air compressor also includes: A first shock-absorbing pad is disposed at the bottom of the crankcase; and A second shock-absorbing pad is arranged on a mounting plate connected to the power device; Wherein, the bottoms of the first shock-absorbing pad and the second shock-absorbing pad are both provided with transition plates for facilitating installation of the whole vehicle.

9. The oil-free two-stage air compressor according to claim 7, characterized in that: The crankcase also includes: An exhaust gas pipeline for discharging exhaust gas, wherein the exhaust gas pipeline is provided with a one-way valve to prevent impurities from entering; Fan assembly and cooling fins for cooling.

10. A vehicle, characterized in that: The invention comprises an oil-containing two-stage air compressor as described in any one of claims 1 to 9.

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