Air compressor

Abstract

The invention discloses an air compressor, and belongs to the technical field of compressors. An air compressor comprises a support and further comprises a cylinder body with a downward end opening, the cylinder body is fixedly installed on the support, a piston block is longitudinally installed in the cylinder body in a sliding mode, an output pipe and an input pipe which are communicated with the cylinder body are arranged on the outer wall of the cylinder body, and a lifting part for driving the piston block to vertically ascend and descend in a reciprocating mode is arranged on the support. The spiral pipe is fixedly installed in the inner wall of the cylinder body, one end of the spiral pipe is communicated with the input pipe, and the other end of the spiral pipe is fixedly connected with a short pipe extending to the top in the cylinder body; according to the air compressor, efficient heat dissipation work of the piston block can be achieved, the piston block works more stably, and then the whole air compressor operates more stably and is longer in service life.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an air compressor. Background Art

[0002] Air compressors are mainly divided into two categories: positive displacement and dynamic. The former compresses gas by changing the gas volume (such as piston type, screw type), and the latter uses high-speed rotating components to increase the gas kinetic energy and convert it into pressure. According to the cooling method, there are air-cooled and water-cooled types; according to the drive method, it is divided into motor-driven and internal combustion engine-driven; according to the exhaust pressure, it can be divided into low-pressure, medium-pressure and high-pressure compressors; according to the use, it can be for general use or special industry-specific; finally, based on the lubrication method, there is also a difference between oil lubrication and oil-free lubrication. Among them, when a piston air compressor works, it is mainly completed by the reciprocating piston inside.

[0003] In the prior art, the cylinder block in the piston compressor mainly completes the cooling work through external air-cooling and water-cooling. The outer wall of the cylinder block often has good heat dissipation, which will cause the temperature inside the cylinder block to be difficult to dissipate efficiently. The main reason is that the temperature generated by the friction between the piston and the inner wall of the cylinder block mainly accumulates on the inner wall of the cylinder block, which will affect the working stability and service life of the air compressor. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the prior art, the external heat dissipation structure makes it difficult to efficiently dissipate the temperature inside the cylinder block, which will affect the working stability and service life of the air compressor, and to propose an air compressor.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An air compressor includes a bracket, and further includes: a cylinder block with the port facing downwards, fixedly installed on the bracket. Among them, a piston block is longitudinally slidably installed inside the cylinder block. An output pipe and an input pipe communicated with the cylinder block are arranged on the outer wall of the cylinder block. A lifting part for driving the piston block to reciprocate up and down is arranged on the bracket; a spiral pipe fixedly installed inside the inner wall of the cylinder block, one end of the spiral pipe is communicated with the input pipe, and the other end of the spiral pipe is fixedly connected with a short pipe extending to the top inside the cylinder block.

[0007] In order to drive the piston block to move up and down inside the cylinder block, preferably, the lifting part includes a disc rotatably connected to the bracket, an eccentrically arranged connecting rod is rotatably connected to the shaft end of the disc, a top column is fixedly connected to the lower end of the piston block, and the end of the connecting rod is rotatably connected to the lower end of the top column.

[0008] In order to facilitate the continuous rotation of the driving disc, preferably, a driving motor is fixedly installed on the bracket, and the output shaft of the driving motor is connected to the disc through a belt transmission assembly.

[0009] In order to facilitate the heat dissipation of the piston block, preferably, a plurality of left slotted grooves and right slotted grooves are respectively arranged on both sides of the upper end of the piston block, the left slotted groove and the right slotted groove are communicated through a guide through hole, and the connection part is connected between the left slotted groove and the short pipe.

[0010] In order to allow air to enter the left slotted groove, preferably, the connection part includes a cross pipe fixedly connected to the end of the short pipe, a slant pipe communicated with the cross pipe is rotatably connected to the axial end of the cross pipe, slide rails located on both sides of the left slotted groove are fixedly connected to the piston block, an exhaust hood with an opening facing the upper end face of the piston block is slidably installed on the slide rails, and the end of the slant pipe is rotatably connected to and communicated with the exhaust hood.

[0011] In order to effectively lubricate the piston block, preferably, an annular plate is fixedly connected to the upper edge of the piston block, an annular upper oil groove is formed between the annular plate and the inner wall of the cylinder block, an annular baffle is fixedly connected to the inner wall of the lower port of the cylinder block, an annular lower oil groove is formed between the annular baffle and the inner wall of the cylinder block, and lubricating oil is stored in both the annular upper oil groove and the annular lower oil groove.

[0012] In order to effectively lubricate the piston block, preferably, a plurality of fuel injection pipes distributed circumferentially are fixedly connected to the lower end of the piston block, the ends of the plurality of fuel injection pipes all face the inner wall of the cylinder block, and a pump oil component for delivering oil to the fuel injection pipes is arranged at the lower end of the piston block.

[0013] In order to automatically deliver lubricating oil to the fuel injection pipes, preferably, the pump oil component includes an annular block fixedly connected to the lower end of the piston block, an annular groove is arranged at the lower end of the annular block, an annular piston plate is longitudinally slidably installed in the annular groove, wherein, a suction pipe extending to the bottom of the annular lower oil groove is fixedly connected to the annular piston plate, the upper end of the suction pipe extends into the annular groove, the input end of the fuel injection pipe extends into the annular groove, one-way valves are fixedly installed in both the suction pipe and the fuel injection pipe, and a spring is installed between the annular piston plate and the inner top of the annular groove.

[0014] In order to automatically supplement the lubricating oil in the annular upper oil groove, further, a thin pipe extending to the bottom of the annular upper oil groove is fixedly connected to the fuel injection pipe, the diameter of the thin pipe is smaller than that of the fuel injection pipe, and a one-way valve is fixedly installed in the thin pipe.

[0015] In order to facilitate the storage of compressed air, further, an air storage tank is fixedly installed on the bracket, and the output pipe is fixedly connected to the input end of the air storage tank through a connecting pipe.

[0016] Compared with the prior art, the present invention provides an air compressor, which has the following beneficial effects:

[0017] 1. In this air compressor, air enters the spiral tube and then is discharged into the cylinder body through the short tube at the other end of the spiral tube. When the air passes through the spiral tube, the flowing air will take away part of the temperature inside the inner wall of the cylinder body, thus dissipating heat from the cylinder body more efficiently.

[0018] 2. In this air compressor, air is conveyed into the horizontal tube through the short tube. When the exhaust hood is aligned with one of the left slots, the exhaust hood will convey air into the left slot. When the air passes through the left slot, the guide through-hole and the right slot, the air will take away part of the temperature on the piston block, thus enabling efficient heat dissipation of the piston block, making the piston block work more stably, and further making the entire air compressor operate more stably and have a longer service life.

[0019] 3. In this air compressor, due to the setting of the annular plate, the lubricating oil is always located in the annular oil groove. When the piston block slides upward, the piston block will push the lubricating oil in the annular oil groove to move along the inner wall of the cylinder body. Thus, the inner wall at the upper end of the cylinder body will be lubricated before the piston block contacts it, so that the lubricating effect of the piston block is better and the service life of the entire device is extended.

[0020] 4. In this air compressor, when the piston block slides downward, the lubricating oil in the annular groove will be sprayed from the spray oil pipe onto the inner wall of the cylinder body, that is, the inner wall of the cylinder body that the piston block is about to contact when sliding downward. Thus, no matter whether the piston block slides upward or downward, the inner wall of the cylinder body has been lubricated in advance, so that the lubricating effect on the piston block is significantly improved and the service life of the entire air compressor is significantly extended.

[0021] 5. In this air compressor, when the liquid level of the lubricating oil in the annular oil groove is low, the pressure at the output end of the thin tube will decrease. Then, when the lubricating oil enters the spray oil pipe, part of the lubricating oil will also enter the thin tube and then be discharged into the annular oil groove from the upper port of the thin tube, automatically completing the oil replenishment work of the annular oil groove, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a first perspective axonometric structural schematic diagram of an air compressor proposed by the present invention;

[0023] Figure 2 is a second perspective axonometric structural schematic diagram of an air compressor proposed by the present invention;

[0024] Figure 3 is a partial axonometric structural schematic diagram of an air compressor proposed by the present invention;

[0025] Figure 4Schematic diagram of the axonometric structure of the cylinder block of an air compressor proposed by the present invention Figure 1 ;

[0026] Figure 5 Schematic diagram of the axonometric structure of the cylinder block of an air compressor proposed by the present invention Figure 2 ;

[0027] Figure 6 Schematic diagram of the front view sectional structure of the cylinder block of an air compressor proposed by the present invention;

[0028] Figure 7 Schematic diagram of the axonometric structure of the piston block of an air compressor proposed by the present invention;

[0029] Figure 8 Schematic diagram of the sectional axonometric structure of the piston block of an air compressor proposed by the present invention;

[0030] Figure 9 Schematic diagram of the axonometric structure of the exhaust hood of an air compressor proposed by the present invention.

[0031] In the figure: 1, bracket; 2, cylinder block; 3, piston block; 4, output pipe; 5, input pipe; 6, drive motor; 7, disc; 8, connecting rod; 9, belt drive assembly; 10, top column; 11, spiral pipe; 12, short pipe; 13, cross pipe; 14, left slot; 15, right slot; 16, guide through hole; 17, slide rail; 18, exhaust hood; 19, inclined pipe; 20, gas storage tank; 21, connecting pipe; 22, annular plate; 23, annular upper oil groove; 24, annular baffle; 25, annular lower oil groove; 26, annular block; 27, annular groove; 28, annular piston plate; 29, oil suction pipe; 30, oil injection pipe; 31, spring; 32, thin pipe; 33, filter element. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0034] Embodiment 1:

[0035] Refer to Figures 1 - 9, an air compressor, including a bracket 1 for supporting the whole device, and further including: a cylinder block 2 with its port facing downwards, fixedly installed on the bracket 1. Wherein, a piston block 3 for compressing air is longitudinally slidably installed in the cylinder block 2. An output pipe 4 and an input pipe 5 communicating with the cylinder block 2 are arranged on the outer wall of the cylinder block 2. The input pipe 5 is used for sucking air, the output pipe 4 is used for discharging air, and a filter element 33 for filtering air is installed at the input end of the input pipe 5. One-way valves are installed inside both of them. A lifting part for driving the piston block 3 to reciprocate up and down is arranged on the bracket 1; a spiral pipe 11 fixedly installed inside the inner wall of the cylinder block 2. Wherein, one end of the spiral pipe 11 is communicated with the input pipe 5, and the other end of the spiral pipe 11 is fixedly connected with a short pipe 12 extending to the top inside the cylinder block 2. A gas storage tank 20 for storing compressed air is fixedly installed on the bracket 1, and the output pipe 4 is fixedly connected with the input end of the gas storage tank 20 through a connecting pipe 21.

[0036] Specifically, during use, the lifting part will drive the piston block 3 to reciprocate up and down in the cylinder block 2. When the piston block 3 slides towards the top inside the cylinder block 2, the air inside the cylinder block 2 will be compressed and discharged through the connecting pipe 21. When the piston block 3 moves downwards, a negative pressure will be generated at the top inside the cylinder block 2, and external air will be sucked through the input pipe 5. When the input pipe 5 sucks air, the air will enter the spiral pipe 11 and then be discharged from the short pipe 12 at the other end of the spiral pipe 11 into the cylinder block 2. When the air passes through the spiral pipe 11, the flowing air will take away part of the temperature inside the inner wall of the cylinder block 2, thereby more efficiently dissipating heat from the cylinder block 2. When the compressed air is discharged through the output pipe 4, the compressed air will be transported to the gas storage tank 20 through the connecting pipe 21, and the storage work of the compressed air can be completed, so as to facilitate the subsequent use of the compressed air.

[0037] Embodiment 2:

[0038] Refer to Figures 1 - 4 , which is basically the same as Embodiment 1. Further, the specific implementation scheme of the lifting part is specifically disclosed.

[0039] The above-mentioned lifting part includes a disc 7 rotatably connected to the bracket 1. An eccentrically arranged connecting rod 8 is rotatably connected to the shaft end of the disc 7. A top column 10 is fixedly connected to the lower end of the piston block 3. The end of the connecting rod 8 is rotatably connected to the lower end of the top column 10. A driving motor 6 is fixedly installed on the bracket 1, and the output shaft of the driving motor 6 is connected to the disc 7 through a belt transmission assembly 9.

[0040] Specifically, during use, the drive motor 6 is started. The drive motor 6 drives the disc 7 to rotate through the belt drive assembly 9. The disc 7 then drives the piston block 3 to reciprocate up and down in the cylinder block 2 based on the principle of a crank-slider through the connecting rod 8. When the piston block 3 slides towards the inner top of the cylinder block 2, the air in the cylinder block 2 is compressed and discharged through the connecting pipe 21. When the piston block 3 moves downward, a negative pressure is generated at the inner top of the cylinder block 2, and external air is sucked through the input pipe 5.

[0041] Embodiment Three:

[0042] Refer to Figures 4 - 9 , which is basically the same as Embodiment Two. Furthermore, a specific implementation scheme for dissipating heat from the piston block 3 is specifically added.

[0043] On both sides of the upper end of the above-mentioned piston block 3, a plurality of left slots 14 and right slots 15 are respectively provided. The left slots 14 and the right slots 15 are connected through a guide through-hole 16. The connection part between the left slots 14 and the short pipe 12 is connected; the connection part includes a cross pipe 13 fixedly connected to the end of the short pipe 12. The axial end of the cross pipe 13 is rotatably connected to an inclined pipe 19 communicating with it. On the piston block 3, slide rails 17 are fixedly connected on both sides of the left slots 14. An exhaust hood 18 with an opening facing the upper end face of the piston block 3 is slidably installed on the slide rails 17. The end of the inclined pipe 19 is rotatably connected to and communicates with the exhaust hood 18.

[0044] Specifically, when the short pipe 12 discharges air, the short pipe 12 conveys air into the cross pipe 13. The cross pipe 13 conveys air into the exhaust hood 18 through the inclined pipe 19. The exhaust hood 18 conveys air to the upper end face of the piston block 3 through the lower port. When the piston block 3 reciprocates up and down, the exhaust hood 18 reciprocates along the upper end face of the piston block 3 on the slide rails 17. When the exhaust hood 18 aligns with one of the left slots 14, the exhaust hood 18 conveys air into the left slot 14. The air then enters the right slot 15 through the guide through-hole 16, and the right slot 15 discharges the air. Finally, the air is discharged from the cylinder block 2 through the output pipe 4. When the air passes through the left slot 14, the guide through-hole 16, and the right slot 15, the air takes away part of the temperature on the piston block 3, thereby realizing the efficient heat dissipation of the piston block 3, making the piston block 3 work more stably, and further making the entire air compressor operate more stably and have a longer service life.

[0045] Embodiment Four:

[0046] Refer to Figures 4 - 6 , which is basically the same as Embodiment Three. Furthermore, a specific implementation scheme for lubricating the piston block 3 is specifically added.

[0047] An annular plate 22 is fixedly connected to the upper end edge of the piston block 3. An annular upper oil groove 23 is formed between the annular plate 22 and the inner wall of the cylinder block 2. An annular baffle 24 is fixedly connected to the inner wall of the lower port of the cylinder block 2. An annular lower oil groove 25 is formed between the annular baffle 24 and the inner wall of the cylinder block 2. Lubricating oil is stored in both the annular upper oil groove 23 and the annular lower oil groove 25.

[0048] Specifically, during use, the setting of the annular plate 22 causes the lubricating oil to always be located in the annular upper oil groove 23. When the piston block 3 slides upward, the piston block 3 will push the lubricating oil in the annular upper oil groove 23 to move along the inner wall of the cylinder block 2. Thus, the inner wall at the upper end of the cylinder block 2 will be lubricated before the piston block 3 comes into contact, thereby making the lubrication effect of the piston block 3 better and extending the service life of the entire device. The lubricating oil flowing downward along the inner wall of the cylinder block 2 will also flow back into the annular lower oil groove 25.

[0049] Embodiment Five:

[0050] Refer to Figures 4 - 6 , which is basically the same as Embodiment Four. Further, a specific implementation scheme for spraying oil on the inner wall of the cylinder block 2 is specifically added.

[0051] A plurality of spray oil pipes 30 distributed circumferentially are fixedly connected to the lower end of the piston block 3. The number of the spray oil pipes 30 is 15 - 50. The preferred number in this application is 30. The ends of the plurality of spray oil pipes 30 all face the inner wall of the cylinder block 2. A pump oil component for delivering oil to the spray oil pipes 30 is provided at the lower end of the piston block 3; the pump oil component includes an annular block 26 fixedly connected to the lower end of the piston block 3. An annular groove 27 is provided at the lower end of the annular block 26. An annular piston plate 28 is longitudinally slidably installed in the annular groove 27. Among them, a suction oil pipe 29 extending to the bottom of the annular lower oil groove 25 is fixedly connected to the annular piston plate 28. The upper end of the suction oil pipe 29 extends into the annular groove 27. The input end of the spray oil pipe 30 extends into the annular groove 27. Check valves are fixedly installed in both the suction oil pipe 29 and the spray oil pipe 30. A spring 31 is installed between the annular piston plate 28 and the inner top of the annular groove 27.

[0052] Specifically, when the piston block 3 slides downward, the oil suction pipe 29 will be pressed by the annular lower oil groove 25, and the oil suction pipe 29 will drive the annular piston plate 28 to slide upward. The lubricating oil at the top inside the annular groove 27 and the spring 31 will both be pressed, and thus will be sprayed from the fuel injection pipe 30 onto the inner wall of the cylinder block 2, that is, the inner wall of the cylinder block 2 that the piston block 3 is about to contact when it slides downward. Therefore, whether the piston block 3 slides upward or downward, the inner wall of the cylinder block 2 is lubricated in advance, so the lubrication effect on the piston block 3 is significantly improved, and the service life of the entire air compressor is significantly increased. When the piston block 3 slides upward, the spring 31 will elastically reset, so that the annular piston plate 28 will slide downward and reset in the annular groove 27, and the lower end of the oil suction pipe 29 will always be pressed against the inner bottom of the annular lower oil groove 25. At this time, the top inside the annular groove 27 will be reset, so that the lubricating oil in the annular lower oil groove 25 will be sucked through the oil suction pipe 29 to realize the reuse of the lubricating oil.

[0053] A thin pipe 32 extending to the inner bottom of the annular upper oil groove 23 is fixedly connected to the above fuel injection pipe 30. The diameter of the thin pipe 32 is smaller than that of the fuel injection pipe 30, and a one-way valve is fixedly installed in the thin pipe 32.

[0054] Specifically, when the liquid level of the lubricating oil in the annular upper oil groove 23 is relatively low, the output pressure of the thin pipe 32 will decrease. Therefore, when the lubricating oil enters the fuel injection pipe 30, part of the lubricating oil will also enter the thin pipe 32 and then be discharged into the annular upper oil groove 23 from the upper port of the thin pipe 32, automatically completing the oil replenishment work of the annular upper oil groove 23, which is more convenient to use. When the liquid level of the lubricating oil in the annular upper oil groove 23 is relatively high, the resistance at the output end of the thin pipe 32 will increase, so the lubricating oil in the fuel injection pipe 30 cannot be transported into the thin pipe 32, which can prevent the lubricating oil in the annular upper oil groove 23 from being excessive.

[0055] When this air compressor is in use, start the driving motor 6. The driving motor 6 will drive the disc 7 to rotate through the belt drive assembly 9. The disc 7 will drive the piston block 3 to reciprocate up and down in the cylinder block 2 in the principle of a crank-slider through the connecting rod 8. When the piston block 3 slides toward the inner top of the cylinder block 2, the air in the cylinder block 2 will be compressed and discharged through the connecting pipe 21. When the piston block 3 moves downward, a negative pressure will be generated at the inner top of the cylinder block 2, and external air will be sucked through the input pipe 5. When the input pipe 5 sucks air, the air will enter the spiral pipe 11 and then be discharged into the cylinder block 2 from the short pipe 12 at the other end of the spiral pipe 11. When the air passes through the spiral pipe 11, the flowing air will take away part of the temperature inside the inner wall of the cylinder block 2, thus more efficiently dissipating heat from the cylinder block 2.

[0056] When the short pipe 12 discharges air, the short pipe 12 will convey air into the horizontal pipe 13, the horizontal pipe 13 will convey air into the exhaust hood 18 through the inclined pipe 19, and the exhaust hood 18 will convey air to the upper end face of the piston block 3 through the lower port. When the piston block 3 reciprocates up and down, the exhaust hood 18 will reciprocate along the upper end face of the piston block 3 on the slide rail 17. When the exhaust hood 18 aligns with one of the left slots 14, the exhaust hood 18 will convey air into the left slot 14, and the air will enter the right slot 15 through the through hole 16, and the right slot 15 will discharge air. Finally, the air will be discharged from the output pipe 4 out of the cylinder block 2. When the air passes through the left slot 14, the through hole 16 and the right slot 15, the air will take away part of the temperature on the piston block 3, thereby realizing the efficient heat dissipation of the piston block 3, making the piston block 3 work more stably, and further making the entire air compressor operate more stably and have a longer service life.

[0057] During use, the setting of the annular plate 22 will keep the lubricating oil always in the annular oil groove 23. When the piston block 3 slides upward, the piston block 3 will push the lubricating oil in the annular oil groove 23 to move along the inner wall of the cylinder block 2. Therefore, the inner wall at the upper end of the cylinder block 2 will be lubricated before the piston block 3 touches it, so that the lubricating effect of the piston block 3 is better and the service life of the entire device is improved.

[0058] When the piston block 3 slides downward, the oil suction pipe 29 will be pressed by the annular lower oil groove 25, and the oil suction pipe 29 will drive the annular piston plate 28 to slide upward. The lubricating oil and the spring 31 at the top of the annular groove 27 will both be pressed, and then will be sprayed from the spray pipe 30 to the inner wall of the cylinder block 2, that is, the inner wall of the cylinder block 2 that the piston block 3 will touch when sliding downward. Therefore, whether the piston block 3 slides upward or downward, the inner wall of the cylinder block 2 is lubricated in advance, so the lubricating effect on the piston block 3 is significantly improved, and the service life of the entire air compressor is significantly improved. When the piston block 3 slides upward, the spring 31 will elastically reset, so that the annular piston plate 28 will slide downward and reset in the annular groove 27, and the lower end of the oil suction pipe 29 will always be pressed against the inner bottom of the annular lower oil groove 25. At this time, the top of the annular groove 27 will be reset, so that the lubricating oil in the annular lower oil groove 25 will be sucked through the oil suction pipe 29, and the lubricating oil flowing downward along the inner wall of the cylinder block 2 will also flow back into the annular lower oil groove 25 to realize the reuse of the lubricating oil.

[0059] When the lubricating oil level in the annular oil groove 23 is relatively low, the pressure at the output end of the thin tube 32 will decrease. Then, when the lubricating oil enters the spray oil pipe 30, part of the lubricating oil will also enter the thin tube 32 and then be discharged into the annular oil groove 23 from the upper port of the thin tube 32, automatically completing the oil replenishment work of the annular oil groove 23, which is more convenient to use. When the lubricating oil level in the annular oil groove 23 is relatively high, the resistance at the output end of the thin tube 32 will increase, so the lubricating oil in the spray oil pipe 30 cannot be transported into the thin tube 32, thus preventing excessive lubricating oil in the annular oil groove 23.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. An air compressor, comprising a bracket (1), characterized in that, Further included are: A cylinder block (2) with its port facing downward, fixedly installed on the bracket (1), wherein a piston block (3) is longitudinally and slidably installed in the cylinder block (2), an output pipe (4) and an input pipe (5) communicating with the cylinder block (2) are provided on the outer wall of the cylinder block (2), and a lifting part for driving the piston block (3) to reciprocate up and down is provided on the bracket (1); A spiral pipe (11) fixedly installed inside the inner wall of the cylinder block (2), wherein one end of the spiral pipe (11) is communicated with the input pipe (5), and the other end of the spiral pipe (11) is fixedly connected with a short pipe (12) extending to the top inside the cylinder block (2).

2. The air compressor according to claim 1, characterized in that, The lifting part includes a disc (7) rotatably connected to the bracket (1), an eccentrically arranged connecting rod (8) is rotatably connected to the shaft end of the disc (7), a top column (10) is fixedly connected to the lower end of the piston block (3), and the end of the connecting rod (8) is rotatably connected to the lower end of the top column (10).

3. An air compressor according to claim 2, characterized in that, A driving motor (6) is fixedly installed on the bracket (1), and the output shaft of the driving motor (6) is connected to the disc (7) through a belt transmission assembly (9).

4. An air compressor according to claim 1, characterized in that, On both sides of the upper end of the piston block (3), a plurality of left slots (14) and right slots (15) are respectively provided, the left slots (14) and the right slots (15) are communicated through a guide through hole (16), and a connecting part is connected between the left slots (14) and the short pipe (12).

5. An air compressor according to claim 4, characterized in that, The connecting part includes a cross pipe (13) fixedly connected to the end of the short pipe (12), an inclined pipe (19) communicated with the cross pipe (13) is rotatably connected to the shaft end of the cross pipe (13), sliding rails (17) located on both sides of the left slot (14) are fixedly connected to the piston block (3), an exhaust hood (18) with an opening facing the upper end surface of the piston block (3) is slidably installed on the sliding rails (17), and the end of the inclined pipe (19) is rotatably connected to and communicated with the exhaust hood (18).

6. The air compressor according to claim 1, characterized in that, A ring plate (22) is fixedly connected to the upper end edge of the piston block (3), an annular upper oil groove (23) is formed between the ring plate (22) and the inner wall of the cylinder block (2), an annular baffle (24) is fixedly connected to the inner wall of the lower port of the cylinder block (2), an annular lower oil groove (25) is formed between the annular baffle (24) and the inner wall of the cylinder block (2), and lubricating oil is stored in both the annular upper oil groove (23) and the annular lower oil groove (25).

7. An air compressor according to claim 6, characterized in that, A plurality of fuel injection pipes (30) distributed circumferentially are fixedly connected to the lower end of the piston block (3), the ends of the plurality of fuel injection pipes (30) all face the inner wall of the cylinder block (2), and an oil pumping component for delivering oil to the fuel injection pipes (30) is provided at the lower end of the piston block (3).

8. An air compressor according to claim 7, characterized in that, The oil pumping component includes an annular block (26) fixedly connected to the lower end of the piston block (3), an annular groove (27) is provided at the lower end of the annular block (26), and an annular piston plate (28) is longitudinally and slidably installed in the annular groove (27), Among them, an oil suction pipe (29) extending to the inner bottom of the annular lower oil groove (25) is fixedly connected to the annular piston plate (28). The upper end of the oil suction pipe (29) extends into the annular groove (27). The input end of the fuel injection pipe (30) extends into the annular groove (27). Check valves are fixedly installed in both the oil suction pipe (29) and the fuel injection pipe (30). A spring (31) is installed between the annular piston plate (28) and the inner top of the annular groove (27).

9. An air compressor according to claim 8, characterized in that, A thin pipe (32) extending to the inner bottom of the annular upper oil groove (23) is fixedly connected to the fuel injection pipe (30). The diameter of the thin pipe (32) is smaller than that of the fuel injection pipe (30). A check valve is fixedly installed in the thin pipe (32).

10. An air compressor according to claim 1, characterized in that, An air storage tank (20) is fixedly installed on the bracket (1). The output pipe (4) is fixedly connected to the input end of the air storage tank (20) through a connecting pipe (21).

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