CN215521171U - Single-phase variable frequency air compressor - Google Patents

Abstract

The utility model discloses a single-phase variable frequency air compressor, which comprises: a base; the compression tank is embedded in the side wall of the inner cavity of the base; the exhaust pipe is arranged at the right end of the top of the base and communicated with the compression tank; the PLC controller is fixedly installed at the left end of the front side of the base, and the exhaust pipe is electrically connected with the PLC controller; the four universal wheels are respectively arranged at the four corners of the bottom of the base; the driving mechanism is arranged on the left side of the top of the base and is electrically connected with the PLC; and the compression mechanism is arranged on the left side of the top of the driving mechanism and is electrically connected with the PLC. This single-phase frequency conversion air compressor machine can not produce great unbalanced moment, and the impact is less, avoids equipment to produce great vibration to reduce the rhythm of belt effectively, avoid spare part fatigue, increase of service life.

Description

Single-phase variable frequency air compressor

Technical Field

The utility model relates to the technical field of air compressors, in particular to a single-phase variable-frequency air compressor.

Background

The air compressor is generally an air compressor, which is a device for compressing air, and is similar to a water pump in structure, most of the air compressors are of a reciprocating piston type, and the compressor is directly driven by a motor to enable a crankshaft to generate rotary motion and drive a connecting rod to enable a piston to generate reciprocating motion, so that the volume of a cylinder is changed. Because of the change of the pressure in the cylinder, the air enters the cylinder through the air filter (muffler) by the air inlet valve, in the compression stroke, the compressed air enters the air storage tank through the exhaust pipe and the one-way valve (check valve) under the action of the exhaust valve due to the reduction of the volume of the cylinder, and the automatic stop is realized by the control of the pressure switch when the exhaust pressure reaches the rated pressure of 0.7 MPa; when the pressure of the air storage tank is reduced to 0.5-0.6MPa, the pressure switch is automatically connected and started, the air compressor provides air source power, is the core equipment of a pneumatic system, and is the main body in an electromechanical air-entraining source device, which is a device for converting mechanical energy of a prime mover (usually a motor or a diesel engine) into gas pressure energy and is an air pressure generating device for compressing air;

the most use crank that current air compressor machine drove piston reciprocating motion, this kind of mode can produce great unbalanced moment, the impact is great, can make equipment produce great vibration, in addition, current air compressor machine's actuating mechanism adopts belt drive mechanism with the torque transmission of motor output shaft to the crank, and the belt drive operation in-process, the both sides of belt form loose edge and tight limit, the stress unbalance that produces by tight limit and loose edge pulling force, this kind of unbalanced stress makes the belt produce anomalous deformation when accelerating, this kind of deformation will make belt transmission in-process can produce the rhythm, spare part fatigue with higher speed, life shortens substantially.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a single-phase variable frequency air compressor, which at least solves the problems of unbalanced moment and belt rhythm of a compression mechanism in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a single-phase variable frequency air compressor machine, includes: a base; the compression tank is embedded in the side wall of the inner cavity of the base; the exhaust pipe is arranged at the right end of the top of the base and communicated with the compression tank; the PLC controller is fixedly installed at the left end of the front side of the base, and the exhaust pipe is electrically connected with the PLC controller; the four universal wheels are respectively arranged at the four corners of the bottom of the base; the driving mechanism is arranged on the left side of the top of the base and is electrically connected with the PLC; the compression mechanism is arranged on the left side of the top of the driving mechanism and is electrically connected with the PLC;

the drive mechanism includes: the shell is fixedly arranged on the left side of the top of the base; the motor is fixedly arranged at the right end of the top of the shell and is electrically connected with the PLC; the transmission assembly is arranged at the bottom end of the inner cavity of the shell and is connected with the output end of the motor; the anti-rhythm component is arranged in the middle of the bottom of the inner cavity of the shell;

the compression mechanism includes: the base is fixedly arranged on the left side of the top of the shell; the number of the piston assemblies is a plurality, and the piston assemblies are respectively arranged on the outer side of the top of the base along the circumferential direction; the mounting plates are arranged on the outer side of the top of the base along the circumferential direction respectively, and the piston assemblies are fixedly connected with the mounting plates; the flywheel assembly is rotatably arranged in the middle of the top of the base and is connected with the transmission assembly, and the plurality of piston assemblies are connected with the flywheel assembly; the top cover is fixedly arranged at the top ends of the mounting plates; coupling assembling, fixed mounting in the top of top cap, coupling assembling is connected a plurality of piston assembly and compression jar, just coupling assembling and PLC controller electric connection.

Preferably, the transmission assembly comprises: the first belt wheel is rotatably arranged on the left side of the bottom of the inner cavity of the shell and is connected with the flywheel component; the second belt wheel is rotatably arranged on the right side of the bottom of the inner cavity of the shell and is fixedly connected with the output end of the motor; and the belt is sleeved on the side walls of the first belt wheel and the second belt wheel in a matched manner.

Preferably, the anti-dysrhythmic assembly comprises: the stop block is arranged in the middle of the bottom of the inner cavity of the shell, and a gap is formed between the stop block and the inner side of the belt; and the extrusion wheel is arranged in the middle of the front side of the inner cavity of the shell and limits the outer side of the belt.

Preferably, the flywheel assembly comprises: the flywheel is rotatably arranged in the middle position of the top of the base and is fixedly connected with the output end of the motor, and the flywheel is in a water drop shape; and the driving rod is arranged on one side of the top tip end of the flywheel.

Preferably, the piston assembly includes: the cylinders of the plurality of piston assemblies are respectively circumferentially arranged on the outer side of the top of the base and are fixedly connected with the mounting plate; the piston is slidably arranged on the inner wall of the cylinder; one end of the mounting rod is arranged on the inner side of the piston; one end of each connecting rod is rotatably connected to the other end of the mounting rod, and the other ends of the connecting rods of the plurality of piston assemblies are rotatably connected with the driving rod; the sealing strips, the quantity is a plurality of, from the past respectively to ground embedded in the outer wall of piston, just the sealing strip is with the inner chamber lateral wall in close contact with of cylinder.

Preferably, the connection assembly includes: the number of the one-way valves is a plurality of groups, each group is two, a group of one-way valves is arranged on the outer side of the top of each of the cylinders, and the mounting directions of the two one-way valves in each group are opposite; the number of the filters is a plurality, and the filters are arranged at the top ends of the check valves of the groups of check valves; the first connecting pipes are provided with a plurality of numbers, and one ends of the first connecting pipes are fixedly connected with the top ends of the other one-way valves in the plurality of groups of one-way valves; the communicating vessel is fixedly arranged in the middle of the top end of the top cover, and the other ends of the first connecting pipes are connected with the side wall of the communicating vessel; one end of the second connecting pipe is connected with the top end of the communicating vessel; the manometer set up in the top of base, the manometer is connected with the compression jar, just the manometer is connected with the other end of second connecting pipe.

Preferably, the check valve with the filter mounted thereon allows only air to flow through the filter to the inner chamber of the cylinder, and the check valve connected to the first connection pipe allows only air to flow from the inner chamber of the cylinder to the first connection pipe.

Compared with the prior art, the utility model has the beneficial effects that: according to the single-phase variable-frequency air compressor, the output end of the motor is driven by the PLC controller to drive the second belt wheel to rotate, the second belt wheel drives the first belt wheel to rotate through the belt, when the belt does rhythm, the inner side of the belt shakes to flap the stop block, the stop block absorbs the internal stress of the belt, and therefore rhythm of the belt is effectively reduced, and the first belt wheel can stably drive the compression mechanism to operate; the flywheel is driven to rotate by the first belt wheel, the driving rod at the top end of the flywheel drives the mounting rod to move towards the inner side or the outer side by the connecting rod, when the piston moves towards the inner side, the volume of an inner cavity formed by the cylinder and the piston is increased, air is sucked from the filter through the one-way valve, when the piston moves outwards, the volume of an inner cavity formed by the cylinder and the piston is compressed, compressed air is conveyed to the communicating device through the first connecting pipe, the resisting moment received by the flywheel is constant no matter the flywheel rotates to any angle, and the gravity center of the flywheel is far away from one end of the driving rod, so that when the flywheel component rotates, keep moment balance under the effect of the resisting moment of a plurality of connecting rods, consequently, can not produce great unbalanced moment, strike less, avoid equipment to produce great vibration to reduce the rhythm of belt effectively, avoid spare part fatigue, increase of service life.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top sectional view of the drive mechanism;

FIG. 3 is a schematic view of a compression mechanism;

FIG. 4 is a top sectional view of the compression mechanism;

fig. 5 is an enlarged view at a.

In the figure: 2. the device comprises a base, 3, a compression tank, 4, a driving mechanism, 41, a shell, 42, a motor, 43, a transmission assembly, 431, a first belt wheel, 432, a second belt wheel, 433, a belt, 44, an anti-rhythm assembly, 441, a stop, 442, a squeezing wheel, 5, a compression mechanism, 51, a base, 52, a piston assembly, 521, a cylinder, 522, a piston, 523, a mounting rod, 524, a connecting rod, 525, a sealing strip, 53, a mounting plate, 54, a flywheel assembly, 541, a flywheel, 542, a driving rod, 55, a connecting assembly, 551, a one-way valve, 552, a filter, 553, a communicating device, 554, a first connecting pipe, 555, a second connecting pipe, 556, a pressure gauge, 56, a top cover, 6, an exhaust pipe, 7, a PLC controller, 8 and a universal wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a single-phase variable frequency air compressor machine, includes: the device comprises a base 2, a compression tank 3, a driving mechanism 4, a compression mechanism 5, an exhaust pipe 6, a PLC (programmable logic controller) 7 and universal wheels 8, wherein the compression tank 3 is embedded in the side wall of an inner cavity of the base 2, the exhaust pipe 6 is arranged at the right end of the top of the base 2 and is communicated with the compression tank 3, high-pressure air can be output to the outside through the exhaust pipe 6, the PLC 7 is fixedly arranged at the left end of the front side of the base 2, the exhaust pipe 6 is electrically connected with the PLC 7, the PLC 7 is formed by modularly combining an internal CPU, an instruction and data memory, an input and output unit, a power supply module, a digital analog unit and other units, instructions for executing operations such as logic operation, sequence control, timing, counting, arithmetic operation and the like are stored in the PLC 7, various types of mechanical equipment or production processes are controlled through digital or analog input and output, the number of the four universal wheels 8 is four, the compression mechanism is arranged at the four corners of the bottom of the base 2, the driving mechanism 4 is arranged at the left side of the top of the base 2 and is electrically connected with the PLC controller 7, and the compression mechanism 5 is arranged at the left side of the top of the driving mechanism 4 and is electrically connected with the PLC controller 7;

the drive mechanism 4 includes: the anti-rhythm device comprises a shell 41, a motor 42, a transmission assembly 43 and an anti-rhythm assembly 44, wherein the shell 41 is fixedly arranged on the left side of the top of the base 2, the motor 42 is fixedly arranged at the right end of the top of the shell 41 and is electrically connected with the PLC 7, the transmission assembly 43 is arranged at the bottom end of an inner cavity of the shell 41 and is connected with an output end of the motor 42, the anti-rhythm assembly 44 is arranged in the middle of the bottom of the inner cavity of the shell 41, and the anti-rhythm assembly 44 is used for preventing the transmission assembly 44 from rhythm generation, avoiding fatigue of parts and greatly prolonging the service life;

the compression mechanism 5 includes: the compressor comprises a base 51, piston assemblies 52, a mounting plate 53, flywheel assemblies 54, a connecting assembly 55 and a top cover 56, wherein the base 51 is fixedly mounted on the left side of the top of the shell 41, the number of the piston assemblies 52 is several, the piston assemblies 52 are respectively mounted on the outer side of the top of the base 51 along the circumferential direction, the number of the mounting plate 53 is several, the mounting plate 53 is respectively disposed on the outer side of the top of the base 51 along the circumferential direction, the piston assemblies 52 are fixedly connected with the mounting plate 53, the mounting plate 53 is used for fixing the piston assemblies 52 and the top cover 56, the flywheel assemblies 54 are rotatably mounted at the middle positions of the top of the base 51, the flywheel assemblies 54 are connected with the transmission assembly 43, the piston assemblies 52 are all connected with the flywheel assemblies 54, the top cover 56 is fixedly mounted at the top ends of the mounting plates 53, the connecting assembly 55 is fixedly mounted at the top ends of the top cover 56, the connecting assembly 55 connects the piston assemblies 52 with the compression tank 3, and the connection assembly 55 is electrically connected to the PLC controller 7.

Preferably, the transmission assembly 43 further comprises: the belt transmission device comprises a first belt wheel 431, a second belt wheel 432 and a belt 433, wherein the first belt wheel 431 is rotatably arranged on the left side of the bottom of an inner cavity of the shell 41 and is connected with the flywheel component 54, the second belt wheel 432 is rotatably arranged on the right side of the bottom of the inner cavity of the shell 41 and is fixedly connected with the output end of the motor 42, the belt 433 is fittingly sleeved on the side walls of the first belt wheel 431 and the second belt wheel 432, the first belt wheel 431, the second belt wheel 432 and the belt 433 form synchronous belt transmission, an annular belt with tooth shapes at equal intervals is arranged on the inner peripheral surface of the belt 433, the first belt wheel 431 and the second belt wheel 432 are wheels correspondingly matched with the belt 433, and when the belt 433 is rotated, the belt is meshed with tooth grooves of the first belt wheel 431 and the second belt wheel 432 to transmit power.

Preferably, the anti-dysrhythmic assembly 44 further includes: stopper 441 and extrusion wheel 442, stopper 441 sets up the inner chamber bottom intermediate position of shell 41, and there is the clearance between the inboard with belt 433, belt 433 forms loose limit and tight limit in the operation both sides, the stress that produces by tight limit and loose limit pulling force is uneven, this kind of unbalanced stress makes the belt produce anomalous deformation when accelerating, this kind of deformation will make belt 433 transmission in-process can produce the rhythm, when the rhythm takes place for belt 433, the inboard shake of belt 433 can pat stopper 441, stopper 441 absorbs the internal stress of belt 433, thereby reduce the rhythm of belt 433 effectively, extrusion wheel 442 sets up the inner chamber front side intermediate position of shell 41, and carry on spacingly to the outside of belt 433, avoid belt 433 to break away from the outer wall of first belt wheel 431.

Still further, the flywheel assembly 54 preferably includes: the flywheel 541 is rotatably installed in the middle position of the top of the base 51 and is fixedly connected with the output end of the motor 42, the flywheel 541 is in a droplet shape, the driving rod 542 is arranged on one side of the top tip end of the flywheel 541, and the center of gravity of the flywheel 541 is far away from one end of the driving rod 542, so that when the flywheel assembly 54 rotates, the moment balance is kept under the action of resisting moment of the connecting rods 524.

Preferably, the piston assembly 52 further comprises: the air cylinder 521 of the piston assemblies 52 of the air cylinder 521 is respectively and circumferentially mounted on the outer side of the top of the base 51 and is fixedly connected with the mounting plate 53, the piston 522 is slidably mounted on the inner wall of the air cylinder 521, the mounting rod 523 is provided with one end arranged on the inner side of the piston 522, one end of the connecting rod 524 is rotatably connected to the other end of the mounting rod 523, the other ends of the connecting rods 524 of the piston assemblies 52 are rotatably connected with the driving rod 542, the sealing strips 525 are respectively embedded in the outer wall of the piston 522 from front to back, and the sealing strips 525 are in close contact with the side wall of the inner cavity of the air cylinder 521, so that the air tightness between the piston 522 and the inner cavity of the air cylinder 521 is ensured.

Preferably, the connection assembly 55 further includes: the air purifier comprises check valves 551, filters 552, a communicating vessel 553, a first connecting pipe 554, a second connecting pipe 555 and a pressure gauge 556, wherein the number of the check valves 551 is a plurality of groups, each group is two, the outer sides of the tops of a plurality of air cylinders 521 are respectively provided with a group of check valves 551, the installation directions of the two check valves 551 in each group are opposite, the number of the filters 552 is a plurality, each group of check valves 551 is provided with a filter 552 on the top end of one check valve 551, the filters 552 are used for filtering dust in air, the number of the first connecting pipes 554 is a plurality, one ends of the first connecting pipes 554 are fixedly connected with the top end of the other check valve 551 in the groups of check valves 551, the communicating vessel 553 is fixedly arranged at the middle position of the top end of the top cover 56, the other ends of the first connecting pipes 554 are connected with the side wall of the communicating vessel 553, one end of the second connecting pipe 555 is connected with the top end of the communicating vessel 553, the pressure gauge 556 is arranged at the top of the base 2, pressure gauge 556 is connected with compression jar 3, and pressure gauge 556 is connected with the other end of second connecting pipe 555, and pressure gauge 556 is arranged in reading the atmospheric pressure in the compression jar 3 inner chamber.

Preferably, further, the check valve 551 with the filter 552 mounted thereon allows only air to flow to the inner chamber of the cylinder 521 through the filter, and the check valve 551 connected to the first connection pipe 554 allows only air to flow from the inner chamber of the cylinder 521 to the first connection pipe 554, thereby ensuring that the volume of the inner chamber formed by the cylinder 521 and the piston 522 is increased and air is sucked from the filter 552 through the check valve 551 when the piston 522 moves to the inner side, and the volume of the inner chamber formed by the cylinder 521 and the piston 522 is compressed and compressed air is delivered to the communication pipe 553 through the first connection pipe 554 when the piston 522 moves to the outer side.

The detailed connection means is a technique known in the art, and the following mainly describes the working principle and process, and the specific operation is as follows.

Step one, the output end of a driving motor 42 of a PLC 7 drives a second belt wheel 432 to rotate, a synchronous belt transmission is formed by a first belt wheel 431, a second belt wheel 432 and a belt 433, an annular belt with tooth shapes at equal intervals is arranged on the inner peripheral surface of the belt 433, the first belt wheel 431 and the second belt wheel 432 are wheels with corresponding inosculation of the belt 433, when the belt 433 rotates, the belt teeth mesh with tooth grooves of the first belt wheel 431 and the second belt wheel 432 to transmit power, but because both sides of the belt 433 form a loose edge and a tight edge during operation, stress generated by the tension of the tight edge and the loose edge is unbalanced, the unbalanced stress generates irregular deformation during acceleration, the deformation can generate rhythm during the transmission process of the belt 433, when the belt 433 generates rhythm, the inner side shake of the belt 433 can absorb the internal stress of the beating the belt 433 by a stopper 441, so as to effectively reduce the rhythm of the belt 433, thereby ensuring that the first belt wheel 431 can stably drive the compression mechanism 5 to operate;

step two, the first pulley 431 drives the flywheel 541 to rotate, the driving rod 542 at the top end of the flywheel 541 drives the mounting rod 523 to move inwards or outwards through the connecting rod 524, when the piston 522 moves inwards, the volume of an inner cavity formed by the cylinder 521 and the piston 522 is increased, air is sucked from the filter 552 through the one-way valve 551, when the piston 522 moves outwards, the volume of the inner cavity formed by the cylinder 521 and the piston 522 is compressed, the compressed air is conveyed to the communicating device 553 through the first connecting pipe 554, the high-pressure air is continuously conveyed to the communicating device 553 by the plurality of first connecting pipes 554, the high-pressure air is converged and conveyed to the compression tank 3 by the communicating device 553, during the rotation of the flywheel 541, the plurality of pistons 522 are in different positions, so that the received resisting moment is constant no matter the flywheel 541 rotates to any angle, and the gravity center of the flywheel 541 is far away from one end of the driving rod 542, thereby ensuring that as flywheel assembly 54 rotates, moment balance is maintained under the resisting moment of the plurality of links 524;

the device effectively reduces the rhythm of the belt in the transmission assembly, and the compression mechanism can not generate unbalanced moment in the operation process, so that the impact is small, and the equipment is prevented from generating large vibration.

In the description of the present invention, it is to be understood that the terms "bottom", "one end", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated; unless otherwise specifically stated or limited, the terms "snap" and "connect" and "set" and "open" and "electrically connect" and "fixedly connect" are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a single-phase variable frequency air compressor machine, includes: base (2), compression jar (3), blast pipe (6), PLC controller (7) and universal wheel (8), compression jar (3) are embedded in the inner chamber lateral wall of base (2), blast pipe (6) set up in the top right-hand member of base (2), and with compression jar (3) are linked together, PLC controller (7) fixed mounting is in the front side left end of base (2), just blast pipe (6) and PLC controller (7) electric connection, universal wheel (8) quantity is four, sets up respectively in the bottom four corners of base (2), and its characterized in that still includes:

the driving mechanism (4) is arranged on the left side of the top of the base (2) and is electrically connected with the PLC (7);

the compression mechanism (5) is arranged on the left side of the top of the driving mechanism (4) and is electrically connected with the PLC (7);

the drive mechanism (4) comprises:

the shell (41) is fixedly arranged on the left side of the top of the base (2);

the motor (42) is fixedly arranged at the right end of the top of the shell (41) and is electrically connected with the PLC (7);

the transmission assembly (43) is arranged at the bottom end of the inner cavity of the shell (41) and is connected with the output end of the motor (42);

the anti-rhythm assembly (44) is arranged at the middle position of the bottom of the inner cavity of the shell (41);

the compression mechanism (5) includes:

the base (51) is fixedly arranged on the left side of the top of the shell (41);

the number of the piston assemblies (52) is several, and the piston assemblies are respectively arranged on the outer side of the top of the base (51) along the circumferential direction;

the mounting plates (53) are arranged on the outer side of the top of the base (51) in the circumferential direction, and the piston assembly (52) is fixedly connected with the mounting plates (53);

the flywheel assembly (54) is rotatably arranged in the middle of the top of the base (51), the flywheel assembly (54) is connected with the transmission assembly (43), and the plurality of piston assemblies (52) are connected with the flywheel assembly (54);

the top cover (56) is fixedly arranged at the top ends of the mounting plates (53);

coupling assembling (55), fixed mounting in the top of top cap (56), coupling assembling (55) are connected a plurality of piston assembly (52) and compression jar (3), just coupling assembling (55) and PLC controller (7) electric connection.

2. The single-phase variable-frequency air compressor of claim 1, wherein: the transmission assembly (43) comprises:

a first belt wheel (431) rotatably arranged at the left side of the bottom of the inner cavity of the shell (41) and connected with the flywheel assembly (54);

the second belt wheel (432) is rotatably arranged on the right side of the bottom of the inner cavity of the shell (41) and is fixedly connected with the output end of the motor (42);

and the belt (433) is sleeved on the side walls of the first belt wheel (431) and the second belt wheel (432) in a matching mode.

3. The single-phase variable-frequency air compressor of claim 2, wherein: the anti-rhythmic assembly (44) includes:

the stop block (441) is arranged at the middle position of the bottom of the inner cavity of the shell (41), and a gap is formed between the stop block and the inner side of the belt (433);

and the extrusion wheel (442) is arranged in the middle of the front side of the inner cavity of the shell (41) and limits the outer side of the belt (433).

4. The single-phase variable-frequency air compressor of claim 3, wherein: the flywheel assembly (54) comprising:

the flywheel (541) is rotatably arranged in the middle position of the top of the base (51) and is fixedly connected with the output end of the motor (42), and the flywheel (541) is in a water drop shape;

and the driving rod (542) is arranged on one side of the top tip of the flywheel (541).

5. The single-phase variable-frequency air compressor of claim 4, wherein: the piston assembly (52) includes:

the cylinders (521) of the piston assemblies (52) are respectively installed on the outer side of the top of the base (51) along the circumferential direction and are fixedly connected with the installation plate (53);

a piston (522) slidably mounted to an inner wall of the cylinder (521);

a mounting rod (523) having one end disposed inside the piston (522);

one end of each connecting rod (524) is rotatably connected to the other end of the mounting rod (523), and the other ends of the connecting rods (524) of the plurality of piston assemblies (52) are rotatably connected with the driving rod (542);

the sealing strips (525) are embedded in the outer wall of the piston (522) from front to back, and the sealing strips (525) are in close contact with the side wall of the inner cavity of the cylinder (521).

6. The single-phase variable-frequency air compressor of claim 5, wherein: the connection assembly (55) comprises:

the number of the one-way valves (551) is a plurality of groups, each group is two, a group of one-way valves (551) are arranged on the outer sides of the tops of the cylinders (521), and the mounting directions of the two one-way valves (551) in each group are opposite;

a plurality of filters (552), wherein the top end of each check valve (551) of the plurality of groups of check valves (551) is provided with the filter (552);

the number of the first connecting pipes (554) is several, and one end of each first connecting pipe is fixedly connected with the top end of another one-way valve (551) in the several groups of one-way valves (551);

the communicating vessel (553) is fixedly arranged at the middle position of the top end of the top cover (56), and the other ends of the first connecting tubes (554) are connected with the side wall of the communicating vessel (553);

a second connection pipe (555) having one end connected to the top end of the communicator (553);

manometer (556), set up in the top of base (2), manometer (556) is connected with compression jar (3), just manometer (556) is connected with the other end of second connecting pipe (555).

7. The single-phase variable-frequency air compressor of claim 6, wherein: the check valve 551 with the filter 552 mounted thereon allows only air to flow through the filter to the inner cavity of the cylinder 521, and the check valve 551 connected to the first connection pipe 554 allows only air to flow from the inner cavity of the cylinder 521 to the first connection pipe 554.

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