Positive and negative pressure integrated air compressor

Abstract

The invention relates to the technical field of air compression devices, in particular to a positive and negative pressure integrated air compressor which comprises a prime mover, a positive and negative pressure generator and a negative pressure generator. A base; the positive pressure generating structure comprises a positive pressure gas inlet and a positive pressure gas outlet, and the positive pressure generating structure is used for compressing low-pressure gas entering from the positive pressure gas inlet and discharging the low-pressure gas from the positive pressure gas outlet; the negative pressure generating structure comprises a negative pressure air inlet and a negative pressure air outlet, and the negative pressure generating structure is used for compressing low-pressure air sucked by the negative pressure air inlet and discharging the low-pressure air from the negative pressure air outlet; compared with the prior art, according to the positive and negative pressure integrated air compressor, the positive pressure generating structure is driven by the prime motor to generate positive pressure, the negative pressure generating structure is driven by the prime motor to generate negative pressure, the air compressor can generate the positive pressure and the negative pressure at the same time, and the size of a positive pressure generating device and the size of a negative pressure generating device in the prior art are reduced; and a richer application scene is provided.

Description

Technical Field

[0001] This invention relates to the field of air compression device technology, and in particular to an integrated positive and negative pressure air compressor. Background Technology

[0002] An air compressor is a mechanical device that achieves efficient gas compression through the alternating operation of cylinders. Its core structure consists of cylinders, pistons, crankshafts, and a cooling system. It can be arranged vertically or horizontally, and the piston reciprocates through a crankshaft connecting rod mechanism to complete the intake, compression, and exhaust cycles. It is mainly used in automotive air conditioning refrigeration, industrial pneumatic tools, food packaging, and medical equipment.

[0003] CN118128723A discloses a dual-cylinder air compressor, including a prime mover, a drive shaft, and an eccentric bushing mounted on the drive shaft; a compression assembly, including a cylinder, a connecting rod, and a piston, wherein a first end of the connecting rod is rotatably connected to the eccentric bushing, and a second end of the connecting rod is fixedly connected to the piston; the compression assembly includes two components, each disposed on one side of the drive shaft; the drive shaft drives the piston to reciprocate along the axial direction of the cylinder, and during the reciprocating motion of the piston, there is a process in which both pistons simultaneously move closer to or further away from the axis of the drive shaft. By limiting the process in which the two pistons simultaneously move closer to or further away from the axis of the drive shaft, it is beneficial to reduce the vibration generated by the two compression assemblies during operation, thus solving the vibration problem at its source.

[0004] CN221800009U discloses an air compressor device, comprising: a drive mechanism, a compressor housing, and two compression assemblies; the two compression assemblies are mounted on opposite end faces of the compressor housing, and the drive mechanism is mounted on one side of the compressor housing and simultaneously connected to both compression assemblies; a first cavity is formed between the compressor housing and the two compression assemblies, and the volume of the first cavity changes periodically during the reciprocating motion of the compression assemblies; cooling holes are provided on the compressor housing. The periodic change in the volume of the first cavity causes gas exchange between the gas in the first cavity and the external ambient gas, and the gas exchange is generated by the movement of the air compressor itself, thereby cooling the air compressor.

[0005] In existing technologies, air compressors can only provide positive pressure, which cannot meet the requirements of special scenarios that require both positive and negative pressure at the same time. Summary of the Invention

[0006] In existing technologies, air compressors can only provide positive pressure, which cannot meet the requirements of special scenarios that require both positive and negative pressure at the same time.

[0007] In view of this, the present invention provides an integrated positive and negative pressure air compressor, comprising: prime mover; The base includes multiple sides, the prime mover is mounted on one of the sides, and mounting holes are provided on at least two sides; A positive pressure generating structure includes a positive pressure inlet and a positive pressure outlet. The positive pressure generating structure is used to compress low-pressure gas entering from the positive pressure inlet and discharge it from the positive pressure outlet. The positive pressure generating structure is connected to a mounting hole. The prime mover cooperates with the positive pressure generating structure and drives the positive pressure generating structure to move. The negative pressure generating structure includes a negative pressure inlet and a negative pressure outlet. The negative pressure generating structure is used to compress the low-pressure gas drawn in through the negative pressure inlet and discharge it through the negative pressure outlet. The negative pressure generating structure is connected to a mounting hole. The prime mover cooperates with the negative pressure generating structure and drives the movement of the negative pressure generating structure.

[0008] In one embodiment, the positive pressure generating structure includes a positive pressure cylinder assembly, which includes a cylinder, a connecting rod, a piston, and a valve plate. A first end of the connecting rod is rotatably connected to the output shaft of the prime mover, and a second end of the connecting rod is fixedly connected to the piston. The piston is installed inside the cylinder, and the valve plate is installed at the end of the cylinder away from the connecting rod. A one-way valve is provided on the valve plate. The negative pressure generating structure includes a negative pressure cylinder assembly, which includes a cylinder, a connecting rod, a piston, and a valve plate. The first end of the connecting rod is rotatably connected to the output shaft of the prime mover, and the second end of the connecting rod is fixedly connected to the piston. The piston is installed inside the cylinder, and the valve plate is installed at the end of the cylinder away from the connecting rod. A one-way valve is provided on the valve plate.

[0009] In one embodiment, the number of positive pressure cylinder assemblies is two, and the two positive pressure cylinder assemblies are disposed on two opposite sides of the base; The number of negative pressure cylinder assemblies is two, and the two negative pressure cylinder assemblies are arranged on two opposite sides of the machine base.

[0010] In one embodiment, the prime mover includes an output shaft, an eccentric shaft is disposed on the output shaft, and the connecting rod is rotatably connected to the output shaft through the eccentric shaft.

[0011] In one embodiment, the eccentric shaft is provided with a through hole and a first eccentric portion and a second eccentric portion arranged along the length direction of the through hole. The two connecting rods of the positive pressure cylinder assembly are connected to the first eccentric portion, and the two connecting rods of the negative pressure cylinder assembly are connected to the second eccentric portion.

[0012] In one embodiment, the first eccentric portion and the second eccentric portion are cylindrical, the through hole is a circular hole, and the axes of the first eccentric portion and the second eccentric portion are disposed on both sides of the axis of the through hole and are located in the same plane as the axis of the through hole.

[0013] In one embodiment, the eccentricity of the eccentric shaft is e, and the effective length of the connecting rod is L, satisfying: 10≤L / e≤16.

[0014] In one embodiment, in the interconnected connecting rod and the piston, the connecting rod is offset relative to the axis of the piston.

[0015] In one embodiment, the plurality of sides of the base form a sealed space, the positive pressure air inlet is disposed on the side, connecting the sealed space with the outside air, and the piston of the positive pressure cylinder assembly is provided with a one-way valve; the positive pressure air outlet is connected to the one-way valve on the valve plate.

[0016] In one embodiment, the negative pressure cylinder assembly further includes a cylinder head, which is fixedly connected to the cylinder. A valve plate is disposed between the cylinder head and the cylinder, forming a first sealing area and a second sealing area between the cylinder head and the valve plate. A one-way valve is respectively disposed on the valve plate at a position corresponding to the first sealing area and the second sealing area, and the two one-way valves have opposite conduction directions. The negative pressure inlet and the negative pressure outlet are respectively connected to one of the one-way valves.

[0017] Compared with existing technologies, the positive and negative pressure integrated air compressor provided by the present invention generates positive pressure by driving a positive pressure generating structure through a prime mover and generates negative pressure by driving a negative pressure generating structure through a prime mover. This allows the air compressor to generate both positive and negative pressure simultaneously, reducing the size of the positive and negative pressure generating devices in existing technologies. This is beneficial for miniaturization and weight reduction of equipment and provides a wider range of application scenarios.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a perspective view of an integrated positive and negative pressure air compressor according to one embodiment of the present invention; Figure 2 This is a top view of an integrated positive and negative pressure air compressor according to one embodiment of the present invention; Figure 3This is a partial structural schematic diagram of an integrated positive and negative pressure air compressor according to one embodiment of the present invention; Figure 4 This is a partial structural schematic diagram of an integrated positive and negative pressure air compressor according to one embodiment of the present invention; Figure 5 This is a schematic diagram of the piston structure according to one embodiment of the present invention; Figure 6 This is a schematic diagram of the piston structure according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of an eccentric shaft according to one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] To address the limitation of miniaturization in existing integrated positive and negative pressure air compressors, this invention provides an integrated positive and negative pressure air compressor, such as... Figures 1 to 7 As shown, it includes: Prime mover 1, for providing rotational power, including an internal combustion engine or an electric motor, said prime mover 1 includes an output shaft 11; The base 2 includes multiple sides 21, which surround a sealed space. The prime mover 1 is mounted on one of the sides 21, and the output shaft 11 of the prime mover 1 extends into the sealed space. At least two sides 21 are provided with mounting holes 22. The positive pressure generating structure 3 includes a positive pressure inlet 31 and a positive pressure outlet 32. The positive pressure generating structure 3 is used to compress the low-pressure gas entering from the positive pressure inlet 31 and discharge it from the positive pressure outlet 32. The positive pressure generating structure 3 is connected to a mounting hole 22. The prime mover 1 cooperates with the positive pressure generating structure 3 and drives the positive pressure generating structure 3 to move. The negative pressure generating structure 4 includes a negative pressure inlet 41 and a negative pressure outlet 42. The negative pressure generating structure 4 is used to compress the low-pressure gas drawn in by the negative pressure inlet 41 and discharge it from the negative pressure outlet 42. The negative pressure generating structure 4 is connected to a mounting hole 22. The prime mover 1 cooperates with the negative pressure generating structure 4 and drives the negative pressure generating structure 4 to move.

[0025] The positive and negative pressure integrated air compressor provided by the present invention generates positive pressure by driving the positive pressure generating structure 3 through the prime mover 1 and generates negative pressure by driving the negative pressure generating structure 4 through the prime mover 1, so that the air compressor can generate positive pressure and negative pressure at the same time, reducing the size of the positive pressure generating device and the negative pressure generating device in the prior art, which is conducive to the miniaturization and weight reduction of the equipment and provides a wider range of application scenarios.

[0026] To achieve positive pressure output, such as Figure 3 and Figure 5 As shown, the positive pressure generating structure 3 includes a positive pressure cylinder assembly 33, which includes a cylinder 51, a connecting rod 52, a piston 53, and a valve plate 54. The cylinder 51 communicates with the mounting hole 22. The first end of the connecting rod 52 is rotatably connected to the output shaft 11 of the prime mover 1, and the second end of the connecting rod 52 is fixedly connected to the piston 53. The piston 53 is installed inside the cylinder 51. The valve plate 54 is installed at the end of the cylinder 51 away from the connecting rod 52, and a one-way valve 56 is provided on the valve plate 54. According to one embodiment of the present invention... A one-way valve 56 is provided on the valve plate 54, which allows gas to pass through the valve plate 54 from the cylinder 51; a one-way valve 56 is provided on the piston 53, which allows gas to pass through the piston 53 from the sealed space into the cylinder 51; according to another embodiment of the present invention, two one-way valves 56 are provided on the valve plate 54, one of which allows gas to pass through the valve plate 54 from the cylinder 51; the other one-way valve 56 allows gas to pass through the valve plate 54 from the outside into the cylinder 51. The reciprocating motion of the piston 53 realizes the compression and intake of gas.

[0027] To achieve negative pressure output, such as Figure 3 and Figure 5 As shown, the negative pressure generating structure 4 includes a negative pressure cylinder assembly 43, which includes a cylinder 51, a connecting rod 52, a piston 53, and a valve plate 54. The first end of the connecting rod 52 is rotatably connected to the output shaft 11 of the prime mover 1, and the second end of the connecting rod 52 is fixedly connected to the piston 53. The piston 53 is installed inside the cylinder 51, and the valve plate 54 is installed at the end of the cylinder 51 away from the connecting rod 52. A one-way valve 56 is provided on the valve plate 54. According to one embodiment of the present invention, a one-way valve 56 is provided on the valve plate 54, which allows gas to pass through the valve plate 54 from the cylinder 51; a one-way valve 56 is provided on the piston 53, which allows gas to pass through the piston 53 from the sealed space into the cylinder 51; according to another embodiment of the present invention, two one-way valves 56 are provided on the valve plate 54, one of which allows gas to pass through the valve plate 54 from the cylinder 51; the other one-way valve 56 allows gas to pass through the valve plate 54 from the outside into the cylinder 51. The reciprocating motion of the piston 53 generates negative pressure.

[0028] To improve work efficiency, such as Figure 2 As shown, there are two positive pressure cylinder assemblies 33, which are arranged on two opposite sides 21 of the base 2; preferably, when one positive pressure cylinder assembly 33 compresses gas, the other positive pressure cylinder assembly 33 draws in gas. The number of negative pressure cylinder assemblies 43 is two, and the two negative pressure cylinder assemblies 43 are arranged on two opposite sides 21 of the base 2. Preferably, when one negative pressure cylinder assembly 43 is compressing gas, the other negative pressure cylinder assembly 43 is drawing in gas. This arrangement makes the power output of the prime mover 1 smooth and the noise low during rotation. At the same time, it can also reduce the maximum power of the prime mover 1, which is beneficial to reducing the overall size and weight of the machine.

[0029] Furthermore, the positive pressure cylinder assembly 33 and the negative pressure cylinder assembly 43 are arranged at intervals.

[0030] In order to achieve the reciprocating motion of piston 53, such as Figure 3 As shown, the prime mover 1 includes an output shaft 11, on which an eccentric shaft 12 is mounted. The connecting rod 52 is rotatably connected to the output shaft 11 via the eccentric shaft 12. The eccentric shaft 12 can be a crankshaft or an eccentric bushing.

[0031] Furthermore, such as Figure 7As shown, the eccentric shaft 12 is provided with a through hole and a first eccentric part 121 and a second eccentric part 122 arranged along the length direction of the through hole. The two connecting rods 52 of the positive pressure cylinder assembly 33 are connected to the first eccentric part 121, and the two connecting rods 52 of the negative pressure cylinder assembly 43 are connected to the second eccentric part 122. This arrangement ensures that when the output shaft 11 rotates, the two positive pressure cylinder assemblies 33 or the negative pressure cylinder assembly 43 sequentially achieve air intake and compression, avoiding simultaneous air intake or compression by the two positive pressure cylinder assemblies 33 or the negative pressure cylinder assembly 43, thereby preventing overload of the prime mover 1's power output.

[0032] Furthermore, the first eccentric portion 121 and the second eccentric portion 122 are cylindrical, and the through hole is a circular hole. The axes of the first eccentric portion 121 and the second eccentric portion 122 are located on both sides of the axis of the through hole and are in the same plane as the axis of the through hole. In addition, this arrangement can effectively reduce the vibration of the whole machine. Specifically, when one of the positive pressure cylinder assemblies 33 is compressed, the center of gravity of the positive pressure generating mechanism and the first eccentric portion 121 is biased towards the positive pressure cylinder assembly 33. At this time, the center of gravity of the negative pressure generating mechanism and the second eccentric portion 122 is biased towards the other positive pressure cylinder assembly 33, thereby offsetting the vibration caused by the change in center of gravity. Similarly, when one of the negative pressure cylinder assemblies 43 is compressed, the center of gravity of the positive pressure generating mechanism and the second eccentric portion 122 is biased towards the negative pressure cylinder assembly 43. At this time, the center of gravity of the positive pressure generating mechanism and the first eccentric portion 121 is biased towards the other negative pressure cylinder assembly 43, thereby offsetting the vibration caused by the change in center of gravity.

[0033] In one embodiment, such as Figure 5 As shown, the eccentricity of the eccentric shaft 12 is e, and the effective length of the connecting rod 52 is L, satisfying: 10 ≤ L / e ≤ 16. Under this design, the maximum swing angle β of the connecting rod 52 during operation is not greater than 10°, preferably, the maximum swing angle β of the connecting rod 52 during operation is between 6° and 9°. Preferably, the minimum included angle θ between the two connecting rods 52 of the positive pressure cylinder assembly 33 or the negative pressure cylinder assembly 43 during operation is not less than 160°. This design, in conjunction with the symmetrical layout of the positive and negative pressure cylinders and the eccentric shaft design with a 180° phase difference, further optimizes the stress state from the source of the transmission chain, achieving the best balance between vibration, wear, and structural dimensions, providing a key guarantee for the high reliability, long life, and low noise operation of this integrated positive and negative pressure machine. In the above, the effective length L of the connecting rod 52 refers to the straight-line distance between the mating center of its first end and the eccentric shaft 12 (i.e., the center of the eccentric part) and the mating center of its second end and the piston 53 when the connecting rod 52 is at any position within its range of motion.

[0034] In one embodiment, such as Figure 4 As shown, the cylinders 51 of the two positive pressure cylinder assemblies 33 are coaxially arranged; the cylinders 51 of the two negative pressure cylinder assemblies 43 are also coaxially arranged. This arrangement helps to compress the length of the positive and negative pressure air compressor in the axial direction of the output shaft 11, thereby reducing the overall length of the positive and negative pressure air compressor.

[0035] To ensure the coaxial arrangement of the positive pressure cylinder assembly 33 and the negative pressure cylinder assembly 43, the connection point between the connecting rod 52 and the piston 53 is located outside the axis of the piston 53. In one embodiment, in the interconnected connecting rod 52 and piston 53, the connecting rod 52 is offset relative to the axis of the piston 53.

[0036] In one embodiment, the plurality of sides 21 of the base 2 enclose a sealed space, the positive pressure air inlet 31 is disposed on the side 21, connecting the sealed space with the outside air, and the piston 53 of the positive pressure cylinder assembly 33 is provided with a one-way valve 56, such as Figure 6 As shown, the positive pressure outlet 32 ​​is connected to the one-way valve 56 on the valve plate 54. Specifically, the base 2, the positive pressure cylinder assembly 33, and the negative pressure cylinder assembly 43 together form the sealed space. External gas enters the sealed space through the positive pressure inlet 31 and passes through the one-way valve 56 on the piston 53 of the positive pressure cylinder assembly 33, entering between the cylinder 51 and the valve plate 54, thereby enabling the piston 53 to compress this portion of gas. This arrangement, on the one hand, helps improve the intake efficiency and compression efficiency of the positive pressure cylinder assembly 33; on the other hand, the continuous flow of external gas can provide continuous forced air cooling for the components within the sealed space, which is beneficial to improving the working continuity and stability of the positive and negative pressure air compressor.

[0037] In one embodiment, such as Figure 4As shown, the negative pressure cylinder assembly 43 also includes a cylinder head 55, which is fixedly connected to the cylinder 51. A valve plate 54 is disposed between the cylinder head 55 and the cylinder 51, forming a first sealing area 57 and a second sealing area 58 between the cylinder head 55 and the valve plate 54. A one-way valve 56 is respectively disposed on the valve plate 54 at a position corresponding to the first sealing area 57 and the second sealing area 58, and the two one-way valves 56 have opposite conduction directions. The negative pressure inlet 41 and the negative pressure outlet 42 are respectively connected to one of the one-way valves 56. External gas enters between the cylinder 51 and the piston 53 through the first sealing area 57. After being compressed, the gas enters the second sealing area 58 again through the valve plate 54 and is discharged through the negative pressure outlet 42, thereby realizing negative pressure output. By setting independent negative pressure inlet 41 and negative pressure outlet 42 and gas flow pipeline in the negative pressure cylinder assembly 43, the gas flow path of the negative pressure generating structure 4 is independent of the positive pressure generating mechanism, thereby enabling the positive and negative pressure air compressor to simultaneously achieve positive and negative pressure output.

[0038] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0039] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0040] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A positive and negative pressure integrated air compressor, characterized by, The utility model relates to a kind of positive pressure and negative pressure generation structure, comprising: A prime mover (1); A machine base (2) comprising a plurality of side faces (21), the prime mover (1) is installed on a side face (21), at least two side faces (21) are provided with mounting holes (22); A positive pressure generation structure (3) comprising a positive pressure inlet (31) and a positive pressure outlet (32), the positive pressure generation structure (3) is used for compressing low-pressure gas entering from the positive pressure inlet (31), and is discharged from the positive pressure outlet (32);The positive pressure generation structure (3) is connected with a mounting hole (22);The prime mover (1) cooperates with the positive pressure generation structure (3) and drives the positive pressure generation structure (3) to move. A negative pressure generation structure (4) comprising a negative pressure inlet (41) and a negative pressure outlet (42), the negative pressure generation structure (4) is used for compressing low-pressure gas suctioned by the negative pressure inlet (41), and is discharged from the negative pressure outlet (42);The negative pressure generation structure (4) is connected with a mounting hole (22);The prime mover (1) cooperates with the negative pressure generation structure (4) and drives the negative pressure generation structure (4) to move.

2. The positive and negative pressure integrated air compressor according to claim 1, characterized by, The positive pressure generation structure (3) comprises a positive pressure cylinder assembly, the positive pressure cylinder assembly comprises a cylinder (51), a connecting rod (52), a piston (53) and a valve plate (54), the first end of the connecting rod (52) is rotatably connected with the output shaft (11) of the prime mover (1), the second end of the connecting rod (52) is fixedly connected with the piston (53), the piston (53) is installed in the cylinder (51), the valve plate (54) is installed at one end of the cylinder (51) away from the connecting rod (52), and a one-way valve (56) is arranged on the valve plate (54); The negative pressure generation structure (4) comprises a negative pressure cylinder assembly (43), the negative pressure cylinder assembly (43) comprises a cylinder (51), a connecting rod (52), a piston (53) and a valve plate (54), the first end of the connecting rod (52) is rotatably connected with the output shaft (11) of the prime mover (1), the second end of the connecting rod (52) is fixedly connected with the piston (53), the piston (53) is installed in the cylinder (51), the valve plate (54) is installed at one end of the cylinder (51) away from the connecting rod (52), and a one-way valve (56) is arranged on the valve plate (54).

3. The positive and negative pressure integrated air compressor according to claim 2, characterized by, The number of the positive pressure cylinder assembly is two, and the two positive pressure cylinder assemblies are arranged on two opposite side faces (21) of the machine base (2); The number of the negative pressure cylinder assembly (43) is two, and the two negative pressure cylinder assemblies (43) are arranged on two opposite side faces (21) of the machine base (2).

4. The positive and negative pressure integrated air compressor according to claim 3, characterized by, The prime mover (1) comprises an output shaft (11), an eccentric shaft (12) is arranged on the output shaft (11), and the connecting rod (52) is rotatably connected with the output shaft (11) through the eccentric shaft (12).

5. The positive and negative pressure integrated air compressor according to claim 4, characterized by, The eccentric shaft (12) is provided with a through hole and a first eccentric part (121) and a second eccentric part (122) arranged along the length direction of the through hole, two connecting rods (52) of the positive pressure cylinder assembly are connected with the first eccentric part (121), and two connecting rods (52) of the negative pressure cylinder assembly (43) are connected with the second eccentric part (122).

6. The positive and negative pressure integrated air compressor according to claim 5, characterized by, The first eccentric part (121) and the second eccentric part (122) are cylindrical, the through hole is a circular hole, the axes of the first eccentric part (121) and the second eccentric part (122) are arranged on both sides of the axis of the through hole and are located in the same plane as the axis of the through hole.

7. The positive and negative pressure integrated air compressor according to claim 4, characterized by, The eccentricity of the eccentric shaft (12) is e, and the effective length of the connecting rod (52) is L, and 10≤L / e≤16 is satisfied.

8. The positive and negative pressure integrated air compressor according to claim 7, characterized by, In the connecting rod (52) and the piston (53) connected with each other, the connecting rod (52) is arranged offset relative to the axis of the piston (53).

9. The positive and negative pressure integrated air compressor according to claim 2, characterized by, The plurality of side surfaces (21) of the machine base (2) surround to form a closed space, the positive pressure air inlet (31) is arranged on the side surface (21) and communicates the closed space with external air, and the piston (53) of the positive pressure cylinder assembly is provided with a one-way valve (56); the positive pressure air outlet (32) communicates with the one-way valve (56) on the valve plate (54).

10. The positive and negative pressure integrated air compressor according to claim 2, characterized by, The negative pressure cylinder assembly (43) further comprises a cylinder cover (55), the cylinder cover (55) is fixedly connected with the cylinder (51), the valve plate (54) is arranged between the cylinder cover (55) and the cylinder (51), a first sealing area (57) and a second sealing area (58) are formed between the cylinder cover (55) and the valve plate (54), one one-way valve (56) is arranged on the valve plate (54) corresponding to the first sealing area (57) and the second sealing area (58) respectively, and the conducting directions of the two one-way valves (56) are opposite; the negative pressure air inlet (41) and the negative pressure air outlet (42) respectively communicate with one one-way valve (56).

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