A portable air compressor

Abstract

The present invention relates to the field of air compressors, and in particular to a portable air compressor, comprising a motor and a chassis arranged at the output end of the motor, a head assembly for compressing air arranged on the chassis, a pressure stabilizing tank arranged on the chassis, the pressure stabilizing tank and the motor arranged on opposite sides of the chassis, and the outer dimensions of the pressure stabilizing tank do not exceed the chassis; the pressure stabilizing tank comprises a side wall and an end cover arranged at the end of the side wall, a cavity is formed between the side wall and the end cover, and the other end of the side wall is sealed and connected to the chassis, so that the cavity becomes an air storage chamber; a mounting portion is arranged on the side wall, and a gas transmission channel connected to the air storage chamber is arranged in the mounting portion, and the input end of the gas transmission channel is connected to the high-pressure end in the head assembly. The present invention is provided with a pressure stabilizing tank at one end of the air compressor, and the outer dimensions of the pressure stabilizing tank do not exceed the chassis, so that it is easy to carry.

Description

Technical Field

[0001] The invention relates to the field of air compressors, in particular to a portable air compressor. Background Art

[0002] An air compressor is a device used to compress gas. It is widely used in various fields of industrial production and is mainly used to provide power sources for pneumatic tools. When using an air compressor, it needs to be connected to a gas tank. Usually, the air compressor host is installed on the gas tank. The gas tank and the air compressor host are connected through a pressure valve, a control valve and a pipeline. Due to the large size of the gas tank, it is inconvenient to move and carry.

[0003] Existing portable air compressors, such as the Chinese utility model patent (publication number: CN201891572U, publication date: 20110706), disclose a portable air compressor, including an air compressor body, the bottom feet on both sides of the front end of the body are fastened with casters by fixing bolts and flat washers, and the rear end of the body is provided with a handle for moving the air compressor, characterized in that: the body is provided with a retractable pull rod on the same side of the handle. Through the cooperation of the handle, casters and pull rod, the air compressor can be easily moved or rotated at an angle, can also be moved in a small or large range, and can even be carried as conveniently as a suitcase, which is light and convenient, greatly improves work efficiency, and saves a lot of non-working time and energy. The whole machine has high efficiency, compact structure, light weight, small size, and is easy to carry and move.

[0004] However, the portable air compressor has the following problems: the air compressor host is still installed on the gas storage tank, and the volume of the gas storage tank is much larger than the air compressor host, which is inconvenient to carry the air compressor, especially when working in some small spaces, the air compressor cannot be brought in. Summary of the invention

[0005] To solve the above problems, the purpose of the present invention is to provide a portable air compressor, wherein a pressure-stabilizing tank is arranged at one end of the chassis, and the outer dimensions of the pressure-stabilizing tank do not exceed the chassis, so that the outer dimensions of the entire air compressor are greatly reduced and easy to carry.

[0006] For the purpose of the present invention, the following technical solutions are adopted to implement:

[0007] A portable air compressor comprises a motor and a chassis arranged at the output end of the motor, a head assembly for compressing air is arranged on the chassis,

[0008] A pressure-stabilizing tank is also provided on the chassis. The pressure-stabilizing tank and the motor are arranged on opposite sides of the chassis. The outer dimensions of the pressure-stabilizing tank do not exceed those of the chassis. The pressure-stabilizing tank includes a side wall and an end cover arranged at the end of the side wall. A cavity is formed between the side wall and the end cover. The other end of the side wall is sealed and connected to the chassis, so that the cavity becomes an air storage chamber. A mounting portion is provided on the side wall. A gas transmission channel connected to the air storage chamber is provided in the mounting portion, and the input end of the gas transmission channel is connected to the high-pressure end in the head assembly.

[0009] Preferably, the head assembly includes a cylinder arranged on a chassis, a cylinder head arranged on the cylinder, and a valve plate located between the cylinder head and the 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 that are not directly connected are arranged between the cylinder head and the valve plate, and the air inlet chamber and the air outlet chamber are separated by a partition arranged in the cylinder head; there is selectable one-way connection between the air inlet chamber and the compression chamber and between the compression chamber and the air outlet chamber; the input end of the air transmission channel is connected to the air outlet chamber.

[0010] Preferably, a second through hole connected to the air outlet chamber is provided on the valve plate, a first air outlet channel connected to the air outlet end of the second through hole is provided on the cylinder, a second air outlet channel connected to the air outlet end of the first air outlet channel is provided on the chassis, and the second air outlet channel extends horizontally along the upper part of the crankcase to the end of the air compressor, and is finally connected to the air supply channel.

[0011] Preferably, a one-way valve is provided in the gas delivery channel to allow gas to flow into the gas storage chamber in only one direction.

[0012] Preferably, the mounting portion is provided with a plurality of mounting ports, and a pressure sensor, a safety valve and a venting connector are respectively mounted on each mounting port.

[0013] Preferably, an inner cavity is provided in the chassis, an air inlet connecting the outside air and the inner cavity, and a first air inlet channel connected to the inner cavity are provided on the chassis; a second air inlet channel connected to the air outlet end of the first air inlet channel is provided on the cylinder, a first through hole connected to the air outlet end of the second air inlet channel is provided on the valve plate, and the first through hole is connected to the air inlet chamber.

[0014] Preferably, an intermediate chamber is provided between the inner wall and the outer wall of the chassis, an opening connecting the inner chamber and the intermediate chamber is provided on the inner wall, and the air inlet end of the first air inlet passage is connected to the intermediate chamber.

[0015] Preferably, a silencer sponge is provided in the air intake chamber of the cylinder head, and the silencer sponge covers the first through hole; a baffle is provided in the air intake chamber of the cylinder head, and the baffle separates a silencer cavity in the air intake chamber, and the silencer sponge is located in the silencer cavity.

[0016] Preferably, a connecting portion is provided on the pressure-stabilizing tank, the connecting portion passes through the air storage chamber and is connected to the chassis, a channel which is not connected to the air storage chamber is provided inside the connecting portion, the outer end of the channel is connected to the outside air, and the inner end is connected to the air inlet on the chassis.

[0017] Preferably, one end of the motor shaft of the motor extends into the chassis, and a first fan blade is arranged on this end of the motor shaft, and the first fan blade is directly opposite to the air inlet; a connecting port for connecting the cylinder is arranged at the upper part of the chassis, and a gap for air to flow upward is arranged between the cylinder and the connecting port.

[0018] In summary, the advantages of the present invention are:

[0019] 1. When the air compressor is taking in air, the air flow direction is: outside air → air inlet → inner cavity of the chassis → first air inlet channel → second air inlet channel → first through hole → air inlet chamber. Compared with the conventional air compressor that has an air inlet on one side of the cylinder head, the air intake path is greatly extended and the silencing effect is improved. Unlike traditional air compressors, which no longer require an additional muffler, this air compressor achieves silencing by changing its own structure, reducing costs.

[0020] 2. An intermediate chamber is set on the side wall of the box body to further extend the air intake path and improve the silencing effect. A silencing chamber is set in the air intake chamber of the cylinder head, and a silencing sponge is set in the silencing chamber to improve the silencing effect. At the same time, since the silencing sponge is inside the cylinder head, the silencing structure is hidden, which improves the integration rate of the air compressor.

[0021] 3. When the air compressor is intake, no additional pipes are used to connect the channels. Instead, the channels required for gas diversion are integrated into the original structure, making the entire equipment compact and reducing the failure rate of the equipment.

[0022] 4. When the air compressor is exhausted, the compressed air passes through the cylinder head, valve plate and cylinder in turn, and is directed to the second air outlet channel of the box. No additional connecting pipe is required during the process, which extends the air flow path and simplifies the connection structure. A pressure-suppressing tank for the final collection of gas is set at one end of the air compressor. The outer dimensions of the pressure-suppressing tank do not exceed the chassis, which greatly reduces the size of the entire air compressor and makes it easy to carry.

[0023] 5. A first fan blade and a second fan blade are respectively arranged at both ends of the motor shaft of the motor. The second fan blade dissipates heat for the motor, and the first fan blade allows outside air to enter the inner cavity of the chassis more smoothly, while allowing part of the air in the inner cavity to be discharged from the gap between the chassis and the cylinder, thereby taking away the heat in the cylinder. This part of the airflow will continue to flow upward along the outer wall of the cylinder, and also have a certain heat dissipation effect on the cylinder head. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of a single-cylinder air compressor.

[0025] Figure 2 This is a bottom view of a single-cylinder air compressor.

[0026] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0027] Figure 4 for Figure 2 Cross-sectional view at BB in the middle.

[0028] Figure 5 A three-dimensional diagram of the chassis.

[0029] Figure 6 This is a schematic diagram of the exploded structure of the chassis.

[0030] Figure 7 The side view of the chassis.

[0031] Figure 8 for Figure 7 Cross-sectional view at CC.

[0032] Fig. 9 Schematic diagram of the exploded structure of the cylinder, valve plate and cylinder head.

[0033] Fig.10 It is a schematic diagram of the structure of the valve plate and the inlet and outlet valve plates.

[0034] Fig.11 It is a schematic diagram of the structure of the bottom of the cylinder head.

[0035] Fig.12 This is a schematic diagram of the explosion structure of a single-cylinder air compressor.

[0036] Fig.13 It is a structural diagram of the pressure-stabilizing tank.

[0037] Fig.14 It is a schematic diagram of the structure in which the fan blades are located inside the chassis.

[0038] Fig.15 Schematic diagram of the exploded structure of the fan blades and chassis.

[0039] Fig.16 Schematic diagram of air flow direction during heat dissipation.

[0040] Fig.17 It is a schematic diagram of the three-dimensional structure of a twin-cylinder air compressor.

[0041] Fig.18 This is a bottom view of a twin-cylinder air compressor.

[0042] Fig.19 for Fig.18Cross-sectional view at DD in the middle.

[0043] Fig. 20 for Fig.18 Cross-sectional view at EE.

[0044] Fig.21 This is a schematic diagram of the exploded structure of the chassis of a twin-cylinder air compressor.

[0045] Fig. 22 It is a schematic diagram of the structure of the chassis of a twin-cylinder air compressor. DETAILED DESCRIPTION

[0046] like Figure 1 and 3 The air compressor shown includes a motor 1 arranged transversely, a case 2 is arranged at the left end of the motor 1, an inner cavity is arranged inside the case 2, the left end of the motor shaft on the motor 1 extends into the inner cavity, and a crank 3 is arranged on the left end of the motor shaft, the crank 3 includes an eccentric portion eccentrically arranged with the motor shaft, a connecting rod 4 extending upward is arranged on the eccentric portion, a piston 5 is arranged at the upper end of the connecting rod 4, the piston 5 is matched in a cylinder 6, the cylinder 6 is installed at the upper part of the case 2, the side wall of the piston 5 is sealed with the inner wall of the cylinder 6, and the piston 5 can move up and down inside the cylinder 6. A valve plate 7 is arranged at the upper part of the cylinder 6, a compression chamber is formed between the top surface of the piston 5 and the valve plate 7, and a hole (one in and one out) for one-way air circulation is arranged on the valve plate 7, which penetrates from top to bottom, so that the compression chamber can inhale and exhale. A cylinder head 8 is arranged at the upper part of the valve plate 7, and an air inlet chamber (low-pressure end) for uncompressed air intake and an air outlet chamber (high-pressure end) for compressed air discharge are arranged in the cylinder head 8. The crank 3, the connecting rod 4, the piston 5, the cylinder 6, the valve plate 7 and the cylinder cover 8 together constitute a machine head assembly.

[0047] When the air compressor is working, the motor shaft of the motor 1 rotates, driving the crank 3 to rotate, so that the connecting rod 4 reciprocates up and down, and the connecting rod 4 drives the piston 5 to reciprocate up and down in the cylinder 6, so that the volume of the compression chamber changes between increasing and decreasing. When the volume of the compression chamber increases, the air pressure in the compression chamber decreases, so that the air in the air inlet chamber enters the compression chamber under the action of the air pressure difference, and then the volume of the compression chamber gradually decreases, and the air in the compression chamber is compressed. 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.

[0048] The holes for one-way air flow on the valve plate 7 mentioned above are realized in the following manner: Fig. 9 As shown, a valve plate 7 is disposed on the upper part of the cylinder 6, and a valve plate air inlet 71 and a valve plate air outlet 72 are disposed on the valve plate 7, which penetrate the upper and lower surfaces of 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. A cylinder head 8 is disposed on the upper part of the valve plate 7, and a partition plate 81 (such as Fig.11As shown in the figure, the partition plate 81 separates the valve plate air inlet 71 and the valve plate air outlet 72, so that a non-connected air inlet chamber (on the right side of the partition plate 81) and an air outlet chamber (on the left side of the partition plate 81) are formed inside the cylinder head 8.

[0049] It can be seen from the above structure that only when the volume of the compression chamber increases and the pressure difference between the air intake chamber and the compression chamber can open the air intake valve plate 711, the air, under the action of negative pressure, pushes the air intake valve plate 711 downward from the air intake chamber and enters the compression chamber. When a certain amount of air is stored in the compression chamber, the piston 5 moves upward, the volume of the compression chamber begins to gradually decrease, and the air in the compression chamber begins to be compressed, so that the pressure of the compression chamber increases. When the pressure difference between the compression chamber and the air outlet chamber can push up the air outlet valve plate 721, 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 a selectable one-way connection.

[0050] like Figure 5 and 6 As shown, the chassis 2 is provided with an air inlet 21 connecting the inner cavity with the outside air, so that the outside air can enter the inner cavity. And a first air inlet channel 22 connected with the inner cavity is provided at the upper part of the chassis 2. Figure 4 As shown, the cylinder 6 is provided with a second air intake passage 61 communicating with the first air intake passage 22. 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 is communicated with the air intake chamber.

[0051] After using the above structure, when the air compressor is taking in air, the air flow direction (such as Figure 4 ) is: outside air→air inlet 21→inner cavity of chassis 2→first air inlet passage 22→second air inlet passage 61→first through hole 73→inlet chamber.

[0052] Compared with the conventional air compressor that opens the air inlet on one side of the cylinder head, the above structure greatly extends the path of air during intake and improves the silencing effect. In addition, the above structure achieves silencing by changing the structure of the air compressor itself, and no longer requires the use of an additional muffler like a traditional air compressor. Therefore, the air compressor reduces costs. It should also be noted that the above structure does not use additional pipes to connect the channels, but integrates the required gas channels into the original structure, making the entire device compact. After adopting the above structure, no new components are added, and the number of mufflers is reduced, which reduces the failure rate of the equipment.

[0053] In order to further extend the air intake path and improve the silencing effect, the following methods can also be used: Figures 4 to 6 As shown, a longitudinally extending middle chamber 23 ( Figure 4(right side in the figure), an opening 24 communicating with the middle chamber 23 is provided on the inner wall of the case 2. It should be noted that the position of the opening 24 is not limited here, and it only needs to communicate with the middle chamber 23. For example, the opening 24 is provided at the bottom of the middle chamber 23. The first air inlet passage 22 is located at the upper end of the middle chamber 23. Air can enter the middle chamber 23 through the opening 24 and be temporarily stored in the middle chamber 23. When the air compressor is inhaled, the air will flow upward from the bottom of the middle chamber 23 into the first air inlet passage 22, which further increases the air flow path and reduces noise.

[0054] In order to realize the setting of the intermediate chamber 23, the chassis 2 specifically includes a left box body 201 and a right box body 202 that are detachably connected. Figure 6 The right side of the right box body 202 is provided with grooves corresponding to each other, and the two grooves are spliced ​​to form an intermediate chamber 23. The right box body 202 is used to connect with the motor 1, and a supporting hole 2021 for supporting the motor shaft of the motor 1 and a right baffle 2022 for separating the inner cavity from the motor 1 are provided on the right box body 202.

[0055] In order to further improve the noise reduction effect, the following methods can also be used: Fig.11 As shown, a silencer chamber 82 is provided in the air intake chamber of the cylinder head 8, and a silencer sponge is provided in the silencer chamber 82, and the silencer sponge covers the first through hole 73. This allows the air to immediately enter the silencer sponge after exiting the first through hole 73, effectively reducing noise. Further, in order to facilitate the fixing of the silencer sponge, a baffle 83 is provided between the air intake chamber and the silencer chamber 82, but it should be noted that the baffle 83 does not close the silencer chamber 82, so that air can enter the air intake chamber from the silencer chamber.

[0056] In order to facilitate the assembly between the cylinder head 8, the valve plate 7 and the cylinder 6, longitudinally connected mounting holes for mounting screws can be provided on the cylinder head 8, the valve plate 7 and the cylinder 6. During installation, the screws pass through the cylinder head 8, the valve plate 7 and the cylinder 6 in sequence from top to bottom to fix the three together. The cylinder 6 is connected to the chassis 2 separately.

[0057] The exhaust part of the air compressor is described below:

[0058] like Figure 4 As shown on the left side of the figure, the valve plate 7 is provided with a second through hole 74 communicating with the gas outlet chamber of the cylinder head 8 (the left side of the partition 81), the cylinder 6 is provided with a first gas outlet passage 62 communicating with the bottom of the second through hole 74, and the chassis 2 is provided with a second gas outlet passage 25 communicating with the bottom of the first gas outlet passage 62. Figure 8As shown, the second air outlet channel 25 extends laterally along the upper part of the chassis 2 toward the end of the air compressor. A solenoid valve 12 is provided on the second air outlet channel 25. The second air outlet channel 25 of the single-cylinder air compressor is roughly L-shaped, and the solenoid valve 12 is provided at the corner of the L-shape, and the solenoid valve 12 controls the opening and closing of the second air outlet channel 25.

[0059] like Figure 1 and 3 As shown, a pressure stabilizing tank 9 is provided at the left end of the air compressor. It is easy to see from the figure that the outer dimensions of the pressure stabilizing tank 9 do not exceed the chassis 2, thereby greatly reducing the volume of the entire air compressor and making it easy to carry. The specific structure of the pressure stabilizing tank 9 is as follows Figure 3 and Fig.13 As shown, it includes a side wall 91, an end cover 92 and a mounting portion 93, the inner end of the side wall 91 ( Figure 3 The outer end of the side wall 91 ( Figure 3 An end cover 92 is provided at the middle left end of the chassis 2, so that an air storage chamber 94 is formed between the left side of the chassis 2 and the area inside the pressure-surge tank 9. The mounting portion 93 is located at the upper part of the pressure-surge tank 9, and a gas delivery channel 931 is provided in the mounting portion 93. One end of the gas delivery channel 931 is connected to the outlet of the second gas outlet channel 25, and the other end is connected to the air storage chamber 94.

[0060] Compared with the traditional cylindrical air storage tank, the structure of the pressure stabilizing tank 9 greatly reduces the volume, so that the pressure stabilizing tank 9 is integrated at one end of the air compressor, which is convenient for carrying the air compressor. In addition, no additional pipe is required for the delivery of compressed air, and the air delivery channel 931 is directly connected to the second air outlet channel 25, which simplifies the structure and reduces the cost.

[0061] like Figure 1 As shown, the mounting portion 93 is further provided with a plurality of mounting openings, on which the pressure sensor 13, the safety valve 14 and the air release connector 15 are respectively mounted.

[0062] like Figure 3 As shown, a one-way valve 16 is provided at the connection between the gas supply channel 931 and the second gas outlet channel 25 to prevent gas from returning when the machine stops.

[0063] like Fig.12 As shown, the pressure stabilizing tank 9 and the left box body 201 are detachably connected by screws, which is convenient for disassembly and assembly and is conducive to maintenance.

[0064] like Figure 3 and 13As shown, a connecting portion 921 is provided in the middle of the end cover 92, and the connecting portion 921 passes through the air storage chamber 94 horizontally and is connected to the left end of the chassis 2. A channel running through the left and right is provided inside the connecting portion 921, and the outer end of the channel is connected to the outside air, and the inner end is connected to the air inlet 21 on the chassis 2. A mounting groove is provided at the outer end of the connecting portion 921, and a fixing rod 9211 is provided at the inner end of the mounting groove. A filter cover 10 is installed on the fixing rod 9211, and the inner end of the filter cover 10 is arranged on the fixing rod 9211. The filter cover 10 can be connected to the mounting groove in a detachable manner such as a buckle or a thread. The above structure allows the external air to enter the inner cavity of the chassis and filter large particles of impurities in the air through the filter cover 10.

[0065] In order to improve the heat dissipation effect of the air compressor, the following structure can be adopted:

[0066] like Figure 3 As shown, a first fan blade 11 and a second fan blade 17 are respectively arranged at the left end and the right end of the motor shaft of the motor 1, wherein the second fan blade 17 is used to blow air to the left when the air compressor is working, thereby reducing the temperature of the motor. An air guide cover 18 is arranged on the outer side of the second fan blade 17, and the left side of the air guide cover 18 is fixedly arranged on the motor 1, and a gap is left between the air guide cover 18 and the outer shell of the motor 1.

[0067] The following focuses on describing the first fan blade 11 and the effects it can produce:

[0068] like Fig.14 and Fig.15 As shown, the first fan blade 11 is located in the inner cavity of the chassis 2, and the air inlet 21 is arranged opposite to the middle of the first fan blade 11. Under the action of the first fan blade 11, air is more likely to enter the inner cavity from the air inlet 21, and the gas in the inner cavity will be blocked by the right baffle 2022 on the right box body 202, so that it flows upward, so that the first air inlet channel 22 is filled with gas.

[0069] like Fig.15 As shown, a flange 27 protruding toward the inner cavity is provided on the air inlet 21 of the chassis 2. 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, and the blade mounting portion 111 is directly opposite to the air inlet. A plurality of blades 112 are provided on the outer circumference of the blade mounting portion 111. The blades 112 surround the outer side of the flange 27 in the radial direction. The reinforcing plate 113 is provided on the other side of the blade 112 (i.e., the side close to the flange 27) to improve the connection strength of the blade 112.

[0070] like Figure 5 and 9As shown, the upper part of the chassis 2 is provided with a connection port 26 for connecting the cylinder 6, and the lower part of the cylinder 6 is provided with an extension plate 63, which 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 connected to the outside air upward. After adopting the above structure, the flow direction of the air during heat dissipation is as follows Fig.16 As shown, while the air in the inner cavity of the box body 2 flows upward, a part of it will be discharged from the gap between the extension plate 63 and the connection port 26, taking away part of the heat in the cylinder, and this part of the airflow continues to flow upward, contacts the outer side of the cylinder head 8, and flows upward along the outer surface of the cylinder 6, and finally contacts the surface of the cylinder head 8, so that the temperature of the cylinder head 8 decreases. The above structure cooperates with the first fan blade 11 to effectively reduce the temperature of the cylinder 6 and the temperature of the cylinder head 8.

[0071] The bottom of the motor 1 is provided with a support leg, and the support leg is provided with a connection hole, so as to facilitate the fixing of the motor. The bottom of the chassis 2 is roughly aligned with the height of the support leg, so as to facilitate the installation of the entire air compressor.

[0072] A plurality of fins for heat dissipation are arranged on the outer surfaces of the motor 1 , the chassis 2 , the cylinder 6 , the cylinder head 8 and the surge tank 9 .

[0073] A frequency converter is arranged above the motor 1 .

[0074] like Figures 17 to 22 The figure shows a twin-cylinder air compressor, which differs from a single-cylinder air compressor in that two cylinders are disposed on the chassis 2, and each cylinder has corresponding components such as a piston and a cylinder head. In order to apply the above-mentioned inventive concept to the twin-cylinder air compressor, it is necessary to correspondingly dispose two mutually independent first air inlet passages 22 on the chassis 2, each first air inlet passage 22 is connected to a single cylinder, and intermediate chambers 23 are disposed on the left and right sides of the chassis 2, and openings 24 are disposed on each intermediate chamber 23. At the same time, in order to collect the compressed gas in the two cylinders, the second air outlet passage 25 is located in the middle of the top of the chassis 2. As shown in FIG. Fig.19 As shown, the two cylinders and the connecting parts on the cylinders are arranged symmetrically on the left and right, and the rest of the structure is consistent with the single-cylinder air compressor.

Claims

1. A portable air compressor, comprising a motor (1) and a housing (2) arranged at an output end of the motor (1), a head assembly for compressing air being arranged on the housing (2), characterized in that: The chassis (2) is also provided with a pressure stabilizing tank (9), the pressure stabilizing tank (9) and the motor (1) are provided on opposite sides of the chassis (2), and the outer dimensions of the pressure stabilizing tank (9) do not exceed those of the chassis (2); the pressure stabilizing tank (9) comprises a side wall (91) and an end cover (92) provided at an end of the side wall (91), a cavity is formed between the side wall (91) and the end cover (92), and the other end of the side wall (91) is sealedly connected to the chassis (2), so that the cavity becomes an air storage chamber (94); a mounting portion (93) is provided on the side wall (91), and a gas transmission channel (931) communicating with the gas storage chamber (94) is provided in the mounting portion (93), and an input end of the gas transmission channel (931) is communicated with a high-pressure end in the head assembly; The head assembly comprises a cylinder (6) arranged on a chassis (2), a cylinder head (8) arranged on the cylinder (6), and a valve plate (7) located between the cylinder head (8) and the cylinder (6); a compression chamber is arranged between the cylinder (6) and the valve plate (7); an air inlet chamber and an air outlet chamber that are not directly connected are arranged between the cylinder head (8) and the valve plate (7), and the air inlet chamber and the air outlet chamber are separated by a partition (81) arranged in the cylinder head (8); the air inlet chamber and the compression chamber, and the compression chamber and the air outlet chamber are selectively connected in one direction; the input end of the air transmission channel (931) is connected to the air outlet chamber; The valve plate (7) is provided with a second through hole (74) in communication with the gas outlet chamber, the cylinder (6) is provided with a first gas outlet channel (62) in communication with the gas outlet end of the second through hole (74), the chassis (2) is provided with a second gas outlet channel (25) in communication with the gas outlet end of the first gas outlet channel (62), the second gas outlet channel (25) extends laterally along the upper part of the chassis (2) toward the end of the air compressor, and finally communicates with the gas supply channel (931); a one-way valve (16) is provided in the gas supply channel (931) for allowing gas to flow into the gas storage chamber (94) in one direction only; a plurality of mounting ports are provided on the mounting portion (93), and a pressure sensor (13), a safety valve (14) and a gas release connector (15) are respectively installed on each mounting port; An inner cavity is provided in the case (2); an air inlet (21) communicating with the outside air and the inner cavity, and a first air inlet passage (22) communicating with the inner cavity are provided on the case (2); a second air inlet passage (61) connected with the air outlet end of the first air inlet passage (22) is provided on the cylinder (6); a first through hole (73) communicating with the air outlet end of the second air inlet passage (61) is provided on the valve plate (7); the first through hole (73) is communicated with the air inlet chamber; an intermediate chamber (23) is provided between the inner wall and the outer wall of the case (2); an opening (24) communicating with the inner cavity and the intermediate chamber (23) is provided on the inner wall; the air inlet end of the first air inlet passage (22) is communicated with the intermediate chamber.

2. A portable air compressor according to claim 1, characterized in that: A silencer sponge is arranged in the air intake chamber of the cylinder head (8), and the silencer sponge covers the first through hole (73); a baffle (83) is arranged in the air intake chamber of the cylinder head (8), and the baffle separates a silencer cavity (82) in the air intake chamber, and the silencer sponge is located in the silencer cavity (82).

3. A portable air compressor according to claim 2, characterized in that: The pressure stabilizing tank (9) is provided with a connecting portion (921), the connecting portion (921) passes through the air storage chamber (94) and is connected to the chassis (2), a passage not connected to the air storage chamber (94) is provided inside the connecting portion (921), the outer end of the passage is connected to the outside air, and the inner end is connected to the air inlet (21) on the chassis (2).

4. A portable air compressor according to claim 2 or 3, characterized in that: One end of the motor shaft of the motor (1) extends into the chassis (2), and a first fan blade (11) is arranged on the end of the motor shaft, and the first fan blade (11) is directly opposite to the air inlet (21); The upper part of the chassis (2) is provided with a connection port (26) for connecting to the cylinder (6), and a gap for air to flow upward is provided between the cylinder (6) and the connection port.

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