CN114542414A

CN114542414A - Portable air compressor

Info

Publication number: CN114542414A
Application number: CN202210171350.9A
Authority: CN
Inventors: 钟仁志; 沈立明; 刘梦林
Original assignee: Xinlei Compressor Co Ltd
Current assignee: Xinlei Compressor Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-05-27

Abstract

The invention relates to the field of air compressors, in particular to a portable air compressor which comprises a motor and a case arranged at the output end of the motor, wherein a machine head assembly for compressing air is arranged on the case; the pressure stabilizing tank comprises a side wall and an end cover arranged at the end part of the side wall, a cavity is formed between the side wall and the end cover, and the other end part of the side wall is hermetically connected with the case, so that the cavity is changed into an air storage chamber; the side wall is provided with an installation part, an air transmission channel communicated with the air storage chamber is arranged in the installation part, and the input end of the air transmission channel is communicated with the high-pressure end in the machine head assembly. According to the invention, the pressure stabilizing tank is arranged at one end of the air compressor, the external dimension of the pressure stabilizing tank does not exceed the chassis, and the air compressor is convenient to carry.

Description

Portable air compressor

Technical Field

The invention relates to the field of air compressors, in particular to a portable air compressor.

Background

The air compressor is a device used for compressing gas, is widely applied to various fields of industrial production, and is mainly used for providing power sources for pneumatic tools and the like. The air compressor is used by being connected with the air storage tank, the main machine of the air compressor is usually installed on the air storage tank, the air storage tank is connected with the main machine of the air compressor through the pressure valve, the control valve and the pipeline, and the air storage tank is large in size and inconvenient to move and carry.

The prior portable air compressor, for example, the chinese utility model patent (publication No. CN201891572U, published japanese patent No. 20110706) discloses a portable air compressor, which comprises an air compressor body, wherein casters are fastened to feet on both sides of the front end of the air compressor body through fixing bolts and flat washers, and a handle for moving the air compressor is arranged at the rear end of the air compressor body, and is characterized in that: the machine body is provided with a telescopic pull rod at the same side of the handle. Through the cooperation of handle, truckle and pull rod, the air compressor machine can easily move or rotate an angle, also can be the removal on a small scale or on a large scale, can conveniently carry like the travelling basket even, and is light and swift convenient, and work efficiency improves greatly, has saved a lot of non-operating time and energy. The whole machine has high efficiency, compact structure, light weight, small volume and convenient carrying and moving.

However, the portable air compressor has the following problems: still install the air compressor machine host computer on the gas holder, and the volume of gas holder is greater than the air compressor machine host computer far away, the carrying of the air compressor machine of being not convenient for, especially when the operation in some narrow and small spaces, can't bring the air compressor machine into.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a portable air compressor, wherein a surge tank is disposed at one end of a housing, and the overall dimension of the surge tank does not exceed the housing, so that the overall dimension of the entire air compressor is greatly reduced and the portable air compressor is convenient to carry.

For the purpose of the invention, the following technical scheme is adopted for implementation:

a portable air compressor comprises a motor and a machine case arranged at the output end of the motor, wherein a machine head component for compressing air is arranged on the machine case,

the chassis is also provided with a pressure stabilizing tank, the pressure stabilizing tank and the motor are arranged on two opposite sides of the chassis, and the overall dimension of the pressure stabilizing tank does not exceed the chassis; the pressure stabilizing tank comprises a side wall and an end cover arranged at the end part of the side wall, a cavity is formed between the side wall and the end cover, and the other end part of the side wall is hermetically connected with the case, so that the cavity is changed into an air storage chamber; the side wall is provided with an installation part, an air transmission channel communicated with the air storage chamber is arranged in the installation part, and the input end of the air transmission channel is communicated with the high-pressure end in the machine head assembly.

Preferably, the machine head assembly comprises an air cylinder arranged on the case, a cylinder cover arranged on the air cylinder and a valve plate positioned between the cylinder cover and the air cylinder; a compression chamber is arranged between the inside of the cylinder and the valve plate; an air inlet chamber and an air outlet chamber which are not directly communicated are arranged between the cylinder cover and the valve plate, and the air inlet chamber and the air outlet chamber are separated by a partition plate arranged in the cylinder cover; the air inlet chamber and the compression chamber and the air outlet chamber are selectively communicated in a one-way mode; the input end of the gas transmission channel is communicated with the gas outlet chamber.

Preferably, the valve plate is provided with a second through hole communicated with the air outlet chamber, the cylinder is provided with a first air outlet channel communicated with an air outlet end of the second through hole, the case is provided with a second air outlet channel communicated with an air outlet end of the first air outlet channel, and the second air outlet channel transversely extends to the end part of the air compressor along the upper part of the crankcase and is finally communicated with the air conveying channel.

Preferably, a one-way valve which only allows gas to flow into the air storage chamber in one way is arranged in the gas transmission channel.

Preferably, the mounting portion is provided with a plurality of mounting ports, and each of the mounting ports is provided with a pressure sensor, a safety valve and a gas release joint.

Preferably, an inner cavity is arranged in the case, and the case is provided with an air inlet communicated with the outside air and the inner cavity and a first air inlet channel communicated with the inner cavity; the cylinder is provided with a second air inlet channel connected with the air outlet end of the first air inlet channel, the valve plate is provided with a first through hole communicated with the air outlet end of the second air inlet channel, and the first through hole is communicated with the air inlet chamber.

Preferably, an intermediate chamber is arranged between the inner wall and the outer wall of the case, an opening for communicating the inner cavity with the intermediate chamber is arranged on the inner wall, and the air inlet end of the first air inlet channel is communicated with the intermediate chamber.

Preferably, a silencing sponge is arranged in the air inlet chamber of the cylinder cover and covers the first through hole; a baffle is arranged in the air inlet chamber of the cylinder cover, a silencing cavity is formed in the air inlet chamber by the baffle, and a silencing sponge is positioned in the silencing cavity.

Preferably, the pressure stabilizing tank is provided with a connecting part, the connecting part penetrates through the air storage chamber and is connected to the case, a channel which is not communicated with the air storage chamber is arranged inside the connecting part, the outer end of the channel is connected with the outside air, and the inner end of the channel is communicated with an air inlet on the case.

Preferably, one end of a motor shaft of the motor extends into the case, a first fan blade is arranged at the end of the motor shaft, and the first fan blade is opposite to the air inlet; the upper part of the case is provided with a connecting port for connecting the cylinder, and a gap for air to flow upwards is arranged between the cylinder and the connecting port.

In conclusion, the invention has the advantages that:

1. when the air compressor machine is admitting air, the flow direction of air is: outside air → air intake → inner cavity of chassis → first air intake channel → second air intake channel → first through hole → air intake chamber. Compared with the conventional air compressor, the air inlet is formed in one side of the cylinder cover, so that the path of air when the air enters is greatly prolonged, and the noise reduction effect is improved. Unlike the traditional air compressor, the air compressor does not need to additionally use a silencer, and the air compressor can realize silencing by changing the structure of the air compressor, so that the cost is reduced.

2. Set up middle cavity on the lateral wall of box for route when air admits air further prolongs, improves noise cancelling effect. Set up the amortization chamber in the air inlet chamber of cylinder cap to set up the amortization sponge in the amortization intracavity, improve noise cancelling effect, simultaneously because the amortization sponge be with the cylinder cap inside, hidden the amortization structure, improved the integration rate of air compressor machine.

3. When the air compressor enters air, an extra connecting pipe is not adopted for connecting the channels, but the required channels for gas diversion are integrated in the original structure, so that the whole equipment is compact in structure, and the failure rate of the equipment is reduced.

4. During the exhaust of air compressor machine, compressed air loops through cylinder cap, valve plate and cylinder, and the water conservancy diversion is to the second outlet channel of box, and the in-process does not need extra connecting pipe to connect, has simplified the structure of connecting when prolonging the air current route. And set up the surge tank that is used for finally collecting gas in the one end of air compressor machine, the overall dimension of surge tank is no longer than quick-witted case for the size of whole air compressor machine reduces greatly, portable.

5. The two ends of a motor shaft of the motor are respectively provided with the first fan blade and the second fan blade, the second fan blade is used for radiating the motor, the first fan blade enables outside air to enter the inner cavity of the case more smoothly, and meanwhile, a part of air in the inner cavity can be discharged from a gap between the case and the cylinder, so that heat in the cylinder is taken away, the part of air flow can continue to flow upwards along the outer wall of the cylinder, and a certain radiating effect is achieved on a cylinder cover.

Drawings

Fig. 1 is a schematic perspective view of a single-cylinder air compressor.

Fig. 2 is a bottom view of the single cylinder air compressor.

Fig. 3 is a cross-sectional view taken at a-a in fig. 2.

Fig. 4 is a cross-sectional view at B-B in fig. 2.

Fig. 5 is a perspective view of the cabinet.

Fig. 6 is an exploded view of the cabinet.

Fig. 7 is a side view of the chassis.

Fig. 8 is a cross-sectional view at C-C in fig. 7.

Fig. 9 is an exploded view of the cylinder, valve plate and cylinder head.

FIG. 10 is a schematic view of the structure of the valve plate and the air inlet/outlet valve plate.

Fig. 11 is a schematic structural view of the bottom of the cylinder head.

Fig. 12 is an exploded view of the single cylinder air compressor.

Fig. 13 is a schematic structural view of the surge tank.

Fig. 14 is a schematic structural diagram of a fan blade located in a chassis.

Fig. 15 is an exploded structure diagram of a fan blade and a chassis.

Fig. 16 is a schematic view showing the flow direction of air during heat dissipation.

Fig. 17 is a schematic perspective view of a double-cylinder air compressor.

Fig. 18 is a bottom view of the two-cylinder air compressor.

Fig. 19 is a cross-sectional view taken at D-D in fig. 18.

Fig. 20 is a cross-sectional view at E-E in fig. 18.

Fig. 21 is an exploded view of the cabinet of the two-cylinder air compressor.

Fig. 22 is a schematic structural diagram of a cabinet of the double-cylinder air compressor.

Detailed Description

As shown in fig. 1 and 3, including the motor 1 that transversely sets up, the left end of motor 1 sets up quick-witted case 2, the inside inner chamber that is provided with of quick-witted case 2, the left end of the motor shaft on the motor 1 stretches into in the inner chamber, and be provided with crank 3 on the left end of motor shaft, crank 3 includes an eccentric portion with motor shaft eccentric settings, set up the connecting rod 4 that upwards extends on the eccentric portion, the upper end of connecting rod 4 sets up piston 5, piston 5 cooperation is in cylinder 6, cylinder 6 installs the upper portion at quick-witted case 2, sealing connection and piston 5 can reciprocate inside cylinder 6 between piston 5 lateral wall and the cylinder 6 inner wall. The upper portion of cylinder 6 is provided with valve plate 7, forms the compression chamber between the top surface of piston 5 and valve plate 7, is provided with the hole (one advances one play) that is used for the one-way circulation of air that runs through from top to bottom on the valve plate 7 for the compression chamber can be breathed in and exhale. The upper portion of the valve plate 7 is provided with a cylinder cover 8, and the cylinder cover 8 is provided with an air inlet chamber (low-pressure end) for inlet of uncompressed air and an air outlet chamber (high-pressure end) for discharge of compressed air. The crank 3, the connecting rod 4, the piston 5, the cylinder 6, the valve plate 7 and the cylinder cover 8 form a machine head assembly together.

When the air compressor works, a motor shaft of the motor 1 rotates to drive the crank 3 to rotate, so that the connecting rod 4 can reciprocate up and down, the connecting rod 4 drives the piston 5 to reciprocate up and down in the cylinder 6, and the volume of the compression chamber is continuously changed between increasing and reducing. When the volume of the compression chamber is increased, the air pressure of the compression chamber is reduced, so that the air in the air inlet chamber enters the compression chamber under the action of air pressure difference, then the volume of the compression chamber is gradually reduced, the air in the compression chamber is compressed, and when the air pressure in the compression chamber reaches a preset value, the compressed air in the compression chamber is discharged into the air outlet chamber.

The above mentioned holes for the unidirectional circulation of air in the valve plate 7 are obtained by: as shown in fig. 9, a valve plate 7 is disposed on the upper portion of the cylinder 6, a valve plate air inlet 71 and a valve plate air outlet 72 penetrating the upper and lower surfaces of the valve plate 7 are disposed on the valve plate 7, an air inlet valve plate 711 is disposed below the valve plate air inlet 71, and an air outlet valve plate 721 is disposed above the valve plate air outlet 72. The upper part of the valve plate 7 is provided with a cylinder cover 8, the cylinder cover 8 is provided with a partition plate 81 (as shown in fig. 11), and the partition plate 81 separates a valve plate air inlet 71 from a valve plate air outlet 72, so that an air inlet chamber (the right side of the partition plate 81) and an air outlet chamber (the left side of the partition plate 81) which are not communicated are formed inside the cylinder cover 8.

With the structure, only when the volume of the compression chamber is increased and the pressure difference between the intake chamber and the compression chamber can open the intake valve plate 711, air pushes the intake valve plate 711 downwards from the intake chamber into the compression chamber under the action of negative pressure. When a certain amount of air is reserved in the compression chamber, the piston 5 moves upwards, the volume of the compression chamber begins to be gradually reduced, the air in the compression chamber begins to be compressed, the pressure of the compression chamber is increased, and when the pressure difference between the compression chamber and the air outlet chamber can push the air outlet valve plate 721 up, the compressed air in the compression chamber passes through the air outlet valve plate 721 and enters the air outlet chamber. The above process is optional one-way communication.

As shown in fig. 5 and 6, the cabinet 2 is provided with an air inlet 21 for communicating the inner cavity with the outside air, which allows the outside air to enter the inner cavity. A first air intake passage 22 communicating with the inner chamber is provided in the upper portion of the casing 2, and a second air intake passage 61 communicating with the first air intake passage 22 is provided in the cylinder 6 as shown in fig. 4. The valve plate 7 is provided with a first through hole 73 communicating with the second air intake passage 61, and the first through hole 73 communicates with the air intake chamber.

After the structure is used, when the air compressor is used for air intake, the flowing direction of air (as shown in fig. 4) is as follows: outside air → the intake port 21 → the inner cavity of the casing 2 → the first air intake passage 22 → the second air intake passage 61 → the first through hole 73 → the intake chamber.

Above-mentioned structure sets up the air inlet in one side of cylinder cap for conventional air compressor machine, has prolonged the route of air when admitting air greatly, has improved the noise cancelling effect to above-mentioned structure realizes the amortization through the structure that changes air compressor machine self, no longer needs additionally to use the muffler like traditional air compressor machine, consequently this air compressor machine reduce cost. Meanwhile, the required gas channels are integrated in the original structure instead of adopting additional connecting pipes for connecting the channels, so that the whole equipment is compact in structure. After adopting above-mentioned structure, do not increase new part, and reduced the setting of muffler, reduced the fault rate of equipment.

In order to further extend the air intake path and improve the noise reduction effect, the following method can be adopted: as shown in fig. 4 to 6, a longitudinally extending intermediate chamber 23 (right side in fig. 4) is provided between the inner wall and the outer wall of the cabinet 2, and an opening 24 communicating with the intermediate chamber 23 is provided on the inner wall of the cabinet 2, and it should be noted that the position of the opening 24 is not limited herein, and only the opening 24 communicating with the intermediate chamber 23 is required, for example, the opening 24 is provided at the bottom of the intermediate chamber 23. The first intake passage 22 is located at the upper end of the intermediate chamber 23. Air can enter the intermediate chamber 23 through the opening 24 and be temporarily stored in the intermediate chamber 23, and when the air compressor is used for air intake, the air can flow upwards from the bottom of the intermediate chamber 23 into the first air intake passage 22, so that the flow path of the air is further increased, and the noise is reduced.

In order to realize the arrangement of the middle chamber 23, the casing 2 specifically includes a left casing 201 and a right casing 202 detachably connected to each other, and corresponding grooves are formed on the same side (for example, the right side in fig. 6) of the left casing 201 and the right casing 202, and the two grooves are spliced to form the middle chamber 23. The right box 202 is used for connecting with the motor 1, and a support hole 2021 for supporting a motor shaft of the motor 1 and a right baffle 2022 for separating an inner cavity from the motor 1 are provided on the right box 202.

In order to further improve the silencing effect, the following method can be adopted: as shown in fig. 11, a silencing chamber 82 is provided in the intake chamber of the cylinder head 8, and a silencing sponge is provided in the silencing chamber 82 and covers the first through hole 73. This makes the air get into the amortization sponge immediately after coming out from first through-hole 73, effectively noise reduction. Further, in order to facilitate the fixing of the silencing sponge, a baffle 83 is arranged between the air inlet chamber and the silencing cavity 82, but it should be noted that the baffle 83 does not close the silencing cavity 82, so that air can enter the air inlet chamber from the silencing cavity.

In order to facilitate the assembly among the cylinder cover 8, the valve plate 7 and the cylinder 6, the cylinder cover 8, the valve plate 7 and the cylinder 6 can be provided with longitudinally communicated mounting holes for mounting screws, and during mounting, the screws sequentially penetrate through the cylinder cover 8, the valve plate 7 and the cylinder 6 from top to bottom to fix the three parts together. The cylinder 6 is separately connected to the cabinet 2.

The exhaust section of the air compressor is described below:

as shown in the left side of fig. 4, the valve plate 7 is provided with a second through hole 74 communicating with the air outlet chamber of the cylinder head 8 (left side of the partition plate 81), the cylinder 6 is provided with a first air outlet passage 62 communicating with the bottom of the second through hole 74, and the housing 2 is provided with a second air outlet passage 25 communicating with the bottom of the first air outlet passage 62. As shown in fig. 8, second air outlet channel 25 extends along the upper portion of cabinet 2 in the lateral direction toward the end of the air compressor. The second air outlet channel 25 is provided with an electromagnetic valve 12. The second air outlet channel 25 of the single-cylinder air compressor is approximately L-shaped, the electromagnetic valve 12 is arranged on the corner of the L-shaped air outlet channel, and the electromagnetic valve 12 controls the on-off of the second air outlet channel 25.

As shown in fig. 1 and 3, the pressure stabilizing tank 9 is arranged at the left end of the air compressor, and the overall dimension of the pressure stabilizing tank 9 is easily found not to exceed the cabinet 2, so that the volume of the whole air compressor is greatly reduced, and the air compressor is convenient to carry. As shown in fig. 3 and 13, the surge tank 9 includes a side wall 91, an end cap 92, and a mounting portion 93, and an inner end (right end in fig. 3) of the side wall 91 abuts against and is connected to a left end of the left case 201 in a sealed manner. An end cap 92 is provided at the outer end (left end in fig. 3) of the side wall 91 so that an air reservoir 94 is formed between the left side of the cabinet 2 and the area inside the surge tank 9. The mounting part 93 is located at the upper part of the surge tank 9, a gas transmission channel 931 is arranged in the mounting part 93, one end of the gas transmission channel 931 is communicated with the outlet of the second gas outlet channel 25, and the other end of the gas transmission channel 931 is communicated with the gas storage chamber 94.

The structure of surge tank 9 has reduced the volume for the gas holder of traditional cylinder greatly for the one end of surge tank 9 integration at the air compressor machine, the carrying of the air compressor machine of being convenient for. And the compressed air is conveyed without an additional connecting pipe, and the air conveying channel 931 is directly communicated with the second air outlet channel 25, so that the structure is simplified, and the cost is reduced.

As shown in fig. 1, the mounting portion 93 is further provided with a plurality of mounting ports, and the pressure sensor 13, the relief valve 14, and the air bleeding connector 15 are mounted on the mounting ports, respectively.

As shown in fig. 3, a check valve 16 is disposed at the junction of the air input passage 931 and the second air output passage 25 to prevent machine shutdown air return.

As shown in fig. 12, the surge tank 9 is detachably connected to the left case 201 by screws, so that the surge tank is easy to disassemble and assemble, and is convenient for maintenance.

As shown in fig. 3 and 13, the end cap 92 is provided at a middle portion thereof with a connection portion 921, and the connection portion 921 is connected to the left end of the cabinet 2 by passing through the air reservoir 94 in a transverse direction. The connecting portion 921 is provided therein with a left-right through passage, an outer end of the passage is connected to the outside air, and an inner end thereof is communicated with the air inlet 21 of the cabinet 2. The outer end of connecting portion 921 is provided with the mounting groove, and the inner of mounting groove is provided with dead lever 9211, installs filter mantle 10 on the dead lever 9211, and the inner setting of filter mantle 10 is on dead lever 9211, and filter mantle 10 can be connected in the mounting groove through detachable mode such as buckle or screw thread. The structure enables external air to enter the inner cavity of the case, and large-particle impurities in the air are filtered through the filter cover 10.

In order to improve the heat dissipation effect of the air compressor, the following structure can be adopted:

as shown in fig. 3, a first fan blade 11 and a second fan blade 17 are respectively arranged at the left end and the right end of a motor shaft of the motor 1, wherein the second fan blade 17 is used for blowing air to the left when the air compressor works, so that the temperature of the motor is reduced. An air guide cover 18 is arranged on the outer side of the second fan blade 17, the left side of the air guide cover 18 is fixedly arranged on the motor 1, and a gap is reserved between the air guide cover 18 and the shell of the motor 1.

The following description focuses on the first fan blade 11 and the effects it can produce:

as shown in fig. 14 and 15, the first fan blade 11 is located in the inner cavity of the chassis 2, and the air inlet 21 is disposed opposite to the middle of the first fan blade 11. Under the action of the first fan blade 11, air can more easily enter the inner cavity from the air inlet 21, and the air in the inner cavity is blocked by the right baffle 2022 on the right box 202, so that the air flows upwards, and the first air inlet channel 22 is filled with air.

As shown in fig. 15, the air inlet 21 of the casing 2 is provided with a flange 27 projecting in the direction of the inner cavity. The first fan blade 11 includes a blade mounting portion 111, a blade 112 and a reinforcing plate 113, the blade mounting portion 111 is mounted on the motor shaft, the blade mounting portion 111 faces the air inlet, the outer circumference of the blade mounting portion 111 is provided with a plurality of blades 112, the blade 112 surrounds the radial outer side of the flange 27, and the reinforcing plate 113 is arranged on the other side (i.e. the side close to the flange 27) of the blade 112 to improve the connection strength of the blade 112.

As shown in fig. 5 and 9, the upper portion of the housing 2 is provided with a connection port 26 for connecting the cylinder 6, the lower portion of the cylinder 6 is provided with an extension plate 63, the extension plate 63 extends into the connection port 26, and a gap is left between the extension plate 63 and the connection port 26, and the gap is communicated with the outside air. After the structure is adopted, the flowing direction of air during heat dissipation is as shown in fig. 16, while the air in the inner cavity of the box body 2 flows upwards, a part of air is discharged from the gap between the extension plate 63 and the connecting port 26 to take away part of heat in the cylinder, and the part of air flow continues to flow upwards, contacts with the outer side of the cylinder cover 8, flows upwards along the outer surface of the cylinder 6 and finally contacts with the surface of the cylinder cover 8, so that the temperature of the cylinder cover 8 is reduced. The structure is matched with the first fan blade 11 to effectively reduce the temperature of the air cylinder 6 and the temperature of the cylinder cover 8.

The bottom of the motor 1 is provided with a support leg, and the support leg is provided with a connecting hole, so that the motor can be conveniently fixed. The bottom of the case 2 is approximately aligned with the height of the support legs, so that the whole air compressor can be conveniently installed.

A plurality of fins for heat dissipation are arranged on the outer surfaces of the motor 1, the case 2, the cylinder 6, the cylinder cover 8 and the pressure stabilizing tank 9.

A frequency converter is arranged above the motor 1.

As shown in fig. 17 to 22, a two-cylinder air compressor is distinguished from a single-cylinder air compressor in that two cylinders are provided on the housing 2, and a piston, a cylinder cover, and the like are respectively and correspondingly provided in each cylinder. In order to apply the above inventive concept to the two-cylinder air compressor, two independent first air inlet channels 22 are correspondingly disposed on the cabinet 2, each first air inlet channel 22 is connected to a single cylinder, the left and right sides of the cabinet 2 are respectively provided with the middle chamber 23, and each middle chamber 23 is provided with the opening 24. Meanwhile, in order to collect the compressed gas in the two cylinders, the second outlet channel 25 is located at the middle position of the top of the cabinet 2. As shown in fig. 19, the two cylinders and the connecting parts on the cylinders are arranged in bilateral symmetry, and the rest structure is consistent with that of the single-cylinder air compressor.

Claims

1. A portable air compressor comprises a motor (1) and a machine box (2) arranged at the output end of the motor (1), wherein a machine head component for compressing air is arranged on the machine box (2),

the case (2) is also provided with a pressure stabilizing tank (9), the pressure stabilizing tank (9) and the motor (1) are arranged on two opposite sides of the case (2), and the appearance size of the pressure stabilizing tank (9) does not exceed that of the case (2); the pressure stabilizing tank (9) comprises a side wall (91) and an end cover (92) arranged at the end part of the side wall (91), a cavity is formed between the side wall (91) and the end cover (92), and the other end part of the side wall (91) is hermetically connected with the case (2) so that the cavity becomes an air storage chamber (94); an installation part (93) is arranged on the side wall (91), an air conveying channel (931) communicated with the air storage chamber (94) is arranged in the installation part (93), and the input end of the air conveying channel (931) is communicated with the high-pressure end in the machine head assembly.

2. The portable air compressor as claimed in claim 1, wherein the head assembly includes a cylinder (6) disposed on the housing (2), a cylinder cover (8) disposed on the cylinder (6), and a valve plate (7) disposed between the cylinder cover (8) and the cylinder (6); a compression chamber is arranged between the inside of the cylinder (6) and the valve plate (7); an air inlet chamber and an air outlet chamber which are not directly communicated are arranged between the cylinder cover (8) and the valve plate (7), and the air inlet chamber and the air outlet chamber are separated by a partition plate (81) arranged in the cylinder cover (8); the air inlet chamber and the compression chamber and the air outlet chamber are selectively communicated in a one-way mode; the input end of the gas transmission channel (931) is communicated with the gas outlet chamber.

3. The portable air compressor as claimed in claim 2, wherein the valve plate (7) is provided with a second through hole (74) communicating with the outlet chamber, the cylinder (6) is provided with a first outlet channel (62) communicating with the outlet end of the second through hole (74), the housing (2) is provided with a second outlet channel (25) communicating with the outlet end of the first outlet channel (62), and the second outlet channel (25) extends along the upper portion of the crankcase (2) transversely to the end of the air compressor and finally communicates with the air delivery channel (931).

4. The portable air compressor as claimed in any one of claims 1-3, wherein a check valve (16) is disposed in the air delivery passage (931) to allow only one-way air to flow into the air receiver (94).

5. The portable air compressor as claimed in claim 4, wherein the mounting portion (93) is provided with a plurality of mounting openings, and each of the mounting openings is provided with a pressure sensor (13), a safety valve (14) and a discharge connector (15).

6. The portable air compressor as claimed in claim 2, wherein an inner cavity is formed in the housing (2), and the housing (2) is provided with an air inlet (21) communicating the outside air with the inner cavity and a first air inlet passage (22) communicating with the inner cavity; the cylinder (6) is provided with a second air inlet channel (61) connected with the air outlet end of the first air inlet channel (22), the valve plate (7) is provided with a first through hole (73) communicated with the air outlet end of the second air inlet channel (61), and the first through hole (73) is communicated with the air inlet chamber.

7. The portable air compressor as claimed in claim 6, wherein an intermediate chamber (23) is disposed between the inner wall and the outer wall of the housing (2), an opening (24) is disposed on the inner wall to communicate the inner chamber with the intermediate chamber (23), and an air inlet end of the first air inlet passage (22) is communicated with the intermediate chamber.

8. The portable air compressor as claimed in claim 6 or 7, wherein a silencing sponge is disposed in the inlet chamber of the cylinder cover (8), and covers the first through hole (73); a baffle (83) is arranged in an air inlet chamber of the cylinder cover (8), the baffle separates a silencing cavity (82) in the air inlet chamber, and a silencing sponge is positioned in the silencing cavity (82).

9. The portable air compressor as claimed in claim 6, wherein the surge tank (9) is provided with a connecting portion (921), the connecting portion (921) passes through the air receiver (94) and is connected to the housing (2), the connecting portion (921) is provided with a passage which is not communicated with the air receiver (94), the outer end of the passage is connected to the outside air, and the inner end of the passage is communicated with the air inlet (21) of the housing (2).

10. The portable air compressor as claimed in claim 6 or 9, wherein one end of a motor shaft of the motor (1) extends into the housing (2), and a first blade (11) is disposed at the end of the motor shaft, the first blade (11) facing the air inlet (21); a connecting port (26) for connecting the cylinder (6) is arranged at the upper part of the case (2), and a gap for air to flow upwards is arranged between the cylinder (6) and the connecting port.