Variable-frequency driving air compressor

Abstract

The utility model discloses an air compressor capable of being driven in a variable frequency mode. The shell is fixedly connected to the base; the air pressure sensor is fixedly connected to the shell and located on the side, away from the base, of the shell. The frequency converter is integrally formed on the shell, and the frequency converter is electrically connected with the air pressure sensor; the motor is fixedly connected to the shell, and the motor is electrically connected with the frequency converter; wherein the air pressure sensor is communicated with the interior of the shell so as to measure the air pressure of the air compressor, and the frequency converter changes the rotating speed of the motor through the air pressure sensor. According to the air compressor, the frequency converter is electrically connected with the air pressure sensor, so that the air compressor can adjust the rotating speed of the motor, the air pressure sensor is adopted to measure the air pressure of the air compressor, and the frequency converter changes the rotating speed of the motor through the air pressure sensor, so that the energy consumption utilization rate of the air compressor is increased.

Description

Technical Field

[0001] The utility model relates to the field of mechanical equipment, in particular to an air compressor with variable frequency drive. Background Art

[0002] With the development of industry, air compressors are widely used in industrial production, such as driving pneumatic tools, manufacturing products, transporting gases, cooling and ventilation, etc. An air compressor is a device that compresses air or other gases to increase their pressure. It compresses the gas from a lower pressure to a higher pressure so that it can release greater energy in subsequent work.

[0003] At present, some of the air compressors on the market are non-variable frequency air compressors. Non-variable frequency air compressors tend to maintain a fixed speed during operation, and consume the same energy regardless of the actual air volume demand. This causes the air compressor to operate at full load even when the air volume demand is low, resulting in a large amount of electrical energy waste. In addition, variable frequency air compressors on the market usually use an inverter to achieve variable frequency drive of the air compressor. The inverter often controls the running speed of the motor only according to the preset speed or mode. When the air pressure fluctuates in the inverter, it is easy for the inverter to fail to accurately adjust the motor speed, and when there is an error between the actual air pressure demand and the preset speed or mode, the inverter cannot fully optimize the energy consumption of the air compressor.

[0004] Therefore, it is necessary to provide an air compressor with variable frequency drive that can adjust the rotation speed and effectively improve energy consumption utilization. Utility Model Content

[0005] The utility model aims to provide a variable frequency driven air compressor which can adjust the rotation speed and effectively improve the energy consumption utilization rate.

[0006] According to one aspect of the present application, there is provided an air compressor with variable frequency drive, the air compressor comprising:

[0007] Pedestal;

[0008] A housing, fixedly connected to the base;

[0009] An air pressure sensor, fixedly connected to the housing and located on a side of the housing facing away from the base;

[0010] A frequency converter, the frequency converter is integrally formed on the housing, and the frequency converter is electrically connected to the air pressure sensor;

[0011] A motor, fixedly connected to the housing, the motor being electrically connected to the frequency converter;

[0012] Among them, the pressure sensor is connected to the inside of the housing to measure the air pressure of the air compressor, and the frequency converter changes the rotation speed of the motor through the pressure sensor.

[0013] More preferably, the air compressor further includes:

[0014] A compressor, which is integrally formed on the housing and is located on the side of the housing away from the base.

[0015] More preferably, the compressor includes:

[0016] Cylinders, two of which are fixedly connected to the compressor;

[0017] A copper pipe, which integrally penetrates through the two cylinders, and one end of the copper pipe is fixedly connected to the housing;

[0018] A filter, which is fixedly connected to the other end of the copper pipe;

[0019] Among them, the cylinders conduct the heat of the gas inside the cylinders through the copper pipe to reduce the temperature of the compressor, and the compressor inhales and cleans air through the filter.

[0020] More preferably, the two bases are located on the side of the housing away from the motor, and the bases support the air compressor.

[0021] More preferably, the compressor further includes:

[0022] A mesh cover, which is fixedly connected to the housing, and the surface formed by the mesh cover is the first surface;

[0023] A driven wheel, which is fixedly connected to one side of the compressor and is located between the mesh cover and the compressor;

[0024] Among them, when observing along the direction parallel to the first surface, the mesh cover is located on the side of the compressor away from the frequency converter.

[0025] More preferably, when observing along the direction parallel to the first surface, the compressor, the motor, and the pressure sensor are sequentially arranged on the housing.

[0026] More preferably, the motor further includes:

[0027] A transmission wheel, which is fixedly connected to one side of the motor and is located between the mesh cover and the motor;

[0028] Among them, the motor drives the transmission wheel to rotate in the first direction.

[0029] More preferably, the air compressor further includes:

[0030] The crawler belt is fixedly connected to the driving wheel and the driven wheel;

[0031] Wherein, when observed in a direction perpendicular to the first surface, the driving wheel drives the driven wheel to rotate in the first direction through the crawler belt.

[0032] Preferably, the driven wheel is provided with blades, and the blades rotate in the first direction to form an air flow and blow towards the compressor to cool the compressor.

[0033] Preferably, the frequency converter is provided with a start button and a stop button, and the operation of the air compressor is controlled by the start button and the stop button.

[0034] The utility model has the following beneficial effects:

[0035] By electrically connecting the frequency converter with the air pressure sensor, the air compressor can adjust the rotation speed of the motor, and the air pressure of the air compressor is measured by the air pressure sensor. Moreover, the frequency converter changes the rotation speed of the motor through the air pressure sensor, thereby improving the energy consumption utilization rate of the air compressor. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 It is a three-dimensional structural schematic diagram of the air compressor according to an embodiment of the present utility model;

[0038] Figure 2 It is a three-dimensional structural schematic diagram of the compressor in the air compressor according to an embodiment of the present utility model;

[0039] Figure 3 It is a three-dimensional structural schematic diagram of the compressor and the motor in the air compressor according to an embodiment of the present utility model;

[0040] Figure 4 It is an enlarged three-dimensional structural schematic diagram of the frequency converter in the air compressor according to an embodiment of the present utility model;

[0041] Figure 5 It is a planar structural schematic diagram of the compressor and the motor in the air compressor according to an embodiment of the present utility model;

[0042] Figure 6Schematic three-dimensional structure diagram of the mesh cover in an air compressor according to an embodiment of the present utility model;

[0043] Explanation of reference numerals in the drawings: 100, air compressor; 10, base; 20, housing; 30, air pressure sensor; 40, frequency converter; 41, start button; 42, stop button; 50, motor; 51, driving wheel; 60, compressor; 61, cylinder; 62, copper pipe; 63, filter; 64, driven wheel; 64A, blade; 70, mesh cover; 80, crawler; S1, first surface; F1, first direction. Detailed implementation manners

[0044] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0047] Please refer to Figure 1 - Figure 6 , an embodiment of the present utility model provides a frequency-variable drive air compressor 100, and the air compressor 100 includes: a base 10, a housing 20, an air pressure sensor 30, a frequency converter 40 and a motor 50.

[0048] The housing 20 is fixedly connected to the base 10. The air pressure sensor 30 is fixedly connected to the housing 20 and is located on the side of the housing 20 away from the base 10. The inverter 40 is integrally formed on the housing 20, and the inverter 40 is electrically connected to the air pressure sensor 30. The motor 50 is fixedly connected to the housing 20, and the motor 50 is electrically connected to the inverter 40. The air pressure sensor 30 is connected to the inside of the housing 20 to measure the air pressure of the air compressor 100, and the inverter 40 changes the speed of the motor 50 through the air pressure sensor 30.

[0049] Among them, by using the air pressure sensor 30 and the frequency converter 40 together, the air pressure inside the air compressor 100 can be monitored in real time. When the air pressure sensor 30 detects a change in air pressure, the frequency converter 40 automatically adjusts the speed of the motor 50 according to the data fed back by the sensor to ensure that the system can maintain a stable air pressure output. This can avoid excessive or low air pressure and ensure the safety and work efficiency of the equipment. The frequency converter 40 can dynamically adjust the speed of the motor 50 according to actual needs, rather than letting the motor 50 run at a fixed speed all the time. This variable frequency drive method can reduce the speed of the motor 50 when the demand is low, thereby reducing energy consumption. In practical applications, this energy-saving effect is very obvious, especially in scenarios with large load changes. The motor 50 of the traditional air compressor 100 often runs at a constant speed, which easily leads to excessive wear of mechanical parts. By dynamically adjusting the speed of the motor 50 through the frequency converter 40, the mechanical burden can be reduced, the wear of parts can be reduced, and the service life of the equipment can be extended. Since the frequency converter 40 can quickly respond to the signal changes of the air pressure sensor 30, the air compressor 100 can adapt to different workloads more quickly. This design can avoid the delayed response problem caused by load fluctuation in the traditional air compressor 100, and improve the overall performance of the system. Through the integrated control of the inverter 40, the operator no longer needs to manually adjust the operating state of the motor 50. The automatic linkage between the air pressure sensor 30 and the inverter 40 makes the operation simple and intelligent.

[0050] Preferably, the air compressor 100 further includes a compressor 60 . The compressor 60 is formed integrally on the housing 20 and is located on a side of the housing 20 away from the base 10 .

[0051] Among them, the compressor 60 and the housing 20 are integrally formed to reduce the number of connectors between parts, reduce the complexity of installation, and make the overall structure of the air compressor 100 more compact and stable. This not only saves the space occupied by the equipment, but also reduces the cost of manufacturing and maintenance. Placing the compressor 60 on the side of the housing 20 away from the base 10 can make other key components (such as the motor 50, the air pressure sensor 30, etc.) have a more reasonable layout space, avoid space waste, and improve the integrity and functionality of the whole machine design. The integrated molding of the compressor 60 can also reduce the conduction and propagation of vibration, which is conducive to improving the overall operation stability and durability of the air compressor 100. The integrated design of the compressor 60 and the housing 20 makes the heat dissipation path more direct, ensuring that the heat of the compressor 60 can be quickly dissipated when it is working, avoiding overheating. Through the integrated design, the exposed connection between the compressor 60 and the housing 20 is reduced, the risk of leakage and failure is reduced, and there is no need to disassemble too many parts during maintenance, making the equipment easier to repair and maintain.

[0052] More preferably, the compressor 60 includes: a cylinder 61 , a copper tube 62 and a filter 63 .

[0053] The two cylinders 61 are fixedly connected to the compressor 60. The copper tube 62 integrally penetrates the two cylinders 61, and one end of the copper tube 62 is fixedly connected to the housing 20. The filter 63 is fixedly connected to the other end of the copper tube 62. The cylinder 61 conducts the heat of the gas inside the cylinder 61 through the copper tube 62 to reduce the temperature of the compressor 60, and the compressor 60 inhales and cleans the air through the filter 63.

[0054] Among them, a copper pipe 62 passes through two cylinders 61. The copper pipe 62 can effectively conduct the heat of the gas inside the cylinders 61. Copper has good thermal conductivity, which enables the copper pipe 62 to quickly transfer the heat in the cylinders 61 and prevent the cylinders 61 from overheating. This can ensure that the compressor 60 maintains a lower working temperature during long-term operation and prevent failures or damages caused by overheating. The two cylinders 61 are connected by the same copper pipe 62, and the heat transfer is more uniform, which can effectively balance the temperature difference between the cylinders 61 and further reduce the influence of thermal stress and temperature gradient. A filter 63 is provided at the other end of the copper pipe 62 to filter the air inhaled by the compressor 60, removing impurities and particulate matters in the air and ensuring the cleanliness of the air entering the cylinders 61. This not only improves the quality of the compressed air but also reduces the wear and blockage of the cylinders 61 and other internal components caused by impurities, extending the service life of the equipment. The copper pipe 62 is not only used for heat dissipation but also integrates the air flow between the cylinders 61. The design of the copper pipe 62 passing through the cylinders 61 integrally reduces the complexity of the air flow path, makes the air flow smoother, simplifies the internal structure, and improves the overall operating efficiency. This integrated design reduces the number of independent components that need to be maintained and cleaned, reducing the complexity and cost of equipment maintenance. The combined design of the copper pipe 62 and the filter 63 is convenient for cleaning and replacement, extending the service life of the compressor 60.

[0055] Preferably, the two bases 10 are located on the side of the housing 20 away from the motor 50, and the bases 10 support the air compressor 100.

[0056] Among them, by arranging the two bases 10 on the side of the housing 20 away from the motor 50, the center of gravity of the air compressor 100 can be better balanced. The motor 50 is a relatively heavy component, and placing the bases 10 at a position far from the motor 50 helps to maintain the overall balance during the operation of the air compressor 100, reducing the risk of tilting or moving caused by unstable center of gravity, thereby improving the stability of the equipment. The design of the bases 10 not only plays a supporting role but also can effectively absorb and relieve the vibration generated during equipment operation. Vibration will affect the performance and service life of the equipment. By optimizing the position of the bases 10 structurally, the propagation of vibration can be reduced, protecting the precision components inside the air compressor 100 from impact and extending its life. The motor is usually the main source of noise. Placing the bases 10 on the side away from the motor 50 can reduce the noise propagation path, thereby reducing the overall operating noise of the air compressor 100 and improving the working environment.

[0057] Preferably, the compressor 60 further includes: a mesh cover 70 and a driven wheel 64.

[0058] The mesh cover 70 is fixedly connected to the housing 20, and the surface formed by the mesh cover 70 is the first surface S1. The driven wheel 64 is fixedly connected to one side of the compressor 60 and is located between the mesh cover 70 and the compressor 60. When viewed in a direction parallel to the first surface S1, the mesh cover 70 is located on the side of the compressor 60 that is away from the inverter 40.

[0059] Among them, the function of the mesh cover 70 is to protect the rotating parts inside the compressor 60, especially the driven wheel 64, to prevent external objects or personnel from accidentally contacting the rotating driven wheel 64. Fixing the mesh cover 70 on the housing 20 ensures its firmness and stability, and avoids safety accidents caused by the loosening or falling off of the mesh cover 70. The design of the mesh cover 70 is not only used for safety protection, but also can guide the airflow and help control and guide the direction of air flow, especially during the cooling process, the airflow through the mesh cover 70 can more effectively dissipate heat from the compressor 60. This arrangement can effectively protect the driven wheel 64 from being exposed to the external environment, reduce the possibility of dust and foreign matter entering, and prevent damage to the driven wheel 64. At the same time, this also allows a safe gap between the driven wheel 64 and the mesh cover 70, further ensuring safety during operation.

[0060] More preferably, when viewed along a direction parallel to the first surface S1 , the compressor 60 , the motor 50 , and the air pressure sensor 30 are sequentially disposed on the housing 20 .

[0061] Among them, arranging the compressor 60, the motor 50, and the air pressure sensor 30 on the housing 20 in sequence can achieve a more compact equipment layout. Such an arrangement can effectively save space, reduce the floor area of the equipment, and at the same time ensure that each component can be reasonably arranged and fully utilized in terms of space. Arranging the compressor 60, the motor 50, and the air pressure sensor 30 in sequence on the same housing 20 also helps to achieve the organic combination of different functional modules. Among them, the physical distance between the air pressure sensor 30 and the compressor 60 and the motor 50 is shortened, which can enable the sensor data to be transmitted to the control system of the motor 50 faster and more accurately, improving the reaction speed and accuracy of the equipment. In addition, the air pressure sensor 30 is directly connected to the inside of the housing 20, and can monitor the air pressure change inside the compressor 60 in real time. Due to its short physical distance from the frequency converter 40 and the motor 50, such an arrangement can ensure that the pressure change signal can be transmitted to the control system more quickly, so as to quickly adjust the rotation speed of the motor 50 and achieve more accurate frequency conversion control. Finally, arranging the compressor 60, the motor 50, and the air pressure sensor 30 in sequence also helps to optimize the heat dissipation layout of the equipment. The air flow can pass through each component more smoothly, taking away the heat and avoiding local overheating. Especially in the layout between the compressor 60 and the motor 50, which are two components with relatively large heat generation, a reasonable interval and air flow channel design can effectively improve the heat dissipation performance of the entire system.

[0062] More preferably, the motor 50 further includes: a transmission wheel 51. The transmission wheel 51 is fixedly connected to one side of the motor 50 and is located between the mesh cover 70 and the motor 50. The motor 50 drives the transmission wheel 51 to rotate in the first direction F1.

[0063] Among them, fixing the transmission wheel 51 on one side of the motor 50 and located between the mesh cover 70 and the motor 50, such a design ensures that the rotational power of the motor 50 can be directly transmitted to the transmission wheel 51, thereby efficiently driving the compressor 60 or other loads. This direct drive method can reduce the loss during the power transmission process and improve the overall working efficiency of the air compressor 100. The transmission wheel 51 is directly connected to the motor 50, minimizing power loss. Such an arrangement reduces the intermediate transmission structure and ensures that the power output by the motor 50 can be transmitted to the required place more effectively, improving the power performance of the equipment. The transmission wheel 51 is located between the mesh cover 70 and the motor 50, which means that the mesh cover 70 can effectively protect the transmission wheel 51, prevent foreign objects from entering the transmission system, and avoid unnecessary damage. The mesh cover 70 can also prevent operators or other objects from accidentally contacting the transmission wheel 51, improving the safety of the equipment.

[0064] Preferably, the air compressor 100 further includes: a crawler 80. The crawler 80 is fixedly connected to the driving wheel 51 and the driven wheel 64. When observed in a direction perpendicular to the first surface S1, the driving wheel 51 drives the driven wheel 64 to rotate along the first direction F1 through the crawler 80.

[0065] Among them, the driving wheel 51 and the driven wheel 64 are connected by the crawler 80 to form a closed-loop drive system. Compared with other drive methods (such as belt drive), the crawler 80 can provide better stability during the drive process, reduce the risk of slipping, and thus ensure a more reliable and accurate drive process. The crawler 80 drive system has better rigidity during operation, which enables the power transmission to remain stable under high loads, thereby improving the operating efficiency of the air compressor 100. The crawler 80 can distribute the driving force on a larger contact surface. Compared with the traditional belt drive, it can transmit power more effectively and reduce the energy loss caused by friction. This efficient drive method can improve the overall energy efficiency of the air compressor 100 and reduce energy consumption. The crawler 80 system has a high load-bearing capacity and durability, and can adapt to the use requirements under a variety of complex working conditions. Especially in an industrial environment that requires long-term continuous operation, the reliability of the crawler 80 system is particularly important. Since the crawler 80 system can reduce wear and vibration, the maintenance cycle of the equipment can be extended, and the downtime and maintenance costs can be reduced. This is of great significance for improving the production efficiency and economy of the air compressor 100.

[0066] Preferably, the driven wheel 64 is provided with blades 64A, and the blades 64A rotate along the first direction F1 to form an air flow and blow towards the compressor 60 to cool the compressor 60.

[0067] Among them, when the blades 64A on the driven wheel 64 rotate, a strong air flow can be generated. This air flow can effectively flow through the surface of the compressor 60 and take away the heat generated by it, reducing the temperature of the compressor 60. This is crucial for keeping the compressor 60 within the optimal working temperature range, avoiding performance degradation or damage caused by overheating, and the lower working temperature helps to extend the service life of the equipment and reduce maintenance requirements. Combining the blades 64A with the driven wheel 64 simplifies the equipment structure and the cooling system, reducing additional components and complex arrangements. This simplification helps to reduce manufacturing and maintenance costs while improving the reliability of the equipment. By arranging the blades 64A on the driven wheel 64, it can ensure that the cooling air directly blows towards the key parts of the compressor 60. In this way, more targeted cooling can be achieved, especially in the high-temperature area of the compressor 60, thereby improving the cooling effect. The design of the blades 64A enables the cooling air to accurately flow to the area where the compressor 60 needs to be cooled, ensuring the uniformity and efficiency of the cooling effect.

[0068] Preferably, an on - button 41 and an off - button 42 are provided on the frequency converter 40, and the air compressor 100 is controlled to operate through the on - button 41 and the off - button 42.

[0069] Among them, the setting of the on - button and the off - button 42 enables the operator to directly control the start and stop of the air compressor 100 without going through a complex control system or remote operation. This direct control method is easy to operate, suitable for on - site quick response and adjustment. It allows the operator to quickly stop the machine in case of an emergency to ensure safety. The setting of the buttons makes the operation of the air compressor 100 more intuitive and user - friendly, reducing the dependence on a complex control panel and enhancing the user's operation experience. Even an operator without professional knowledge can complete the basic operation of the air compressor 100 through simple button control. The setting of the buttons also reduces the operation difficulty.

[0070] Thereby, through the electrical connection between the frequency converter 40 and the pressure sensor 30, the air compressor 100 can adjust the speed of the motor 50, measure the air pressure of the air compressor 100 using the pressure sensor 30, and the frequency converter 40 changes the speed of the motor 50 through the pressure sensor 30, improving the energy consumption utilization rate of the air compressor 100.

[0071] The above - described embodiments only represent several embodiments of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application.

Claims

1. A variable frequency driven air compressor, characterized in that: The air compressor comprises: Pedestal; A housing, fixedly connected to the base; An air pressure sensor, fixedly connected to the housing and located on a side of the housing facing away from the base; A frequency converter, the frequency converter is integrally formed on the housing, and the frequency converter is electrically connected to the air pressure sensor; A motor, fixedly connected to the housing, the motor being electrically connected to the frequency converter; The air pressure sensor is connected to the inside of the shell to measure the air pressure of the air compressor, and the frequency converter changes the rotation speed of the motor through the air pressure sensor.

2. The variable frequency driven air compressor according to claim 1, characterized in that: The air compressor also includes: A compressor is formed integrally on the shell and is located on a side of the shell away from the base.

3. The variable frequency driven air compressor according to claim 2, characterized in that: The compressor comprises: Cylinders, two of which are fixedly connected to the compressor; A copper tube integrally passing through the two cylinders, one end of which is fixedly connected to the housing; A filter, the filter being fixedly connected to the other end of the copper tube; The cylinder conducts heat of the gas inside the cylinder through the copper tube to reduce the temperature of the compressor, and the compressor inhales and cleans air through the filter.

4. The variable frequency driven air compressor according to claim 1, characterized in that: The two bases are located on a side of the shell away from the motor, and the bases support the air compressor.

5. The variable frequency driven air compressor according to claim 2, characterized in that: The compressor also includes: A mesh cover is fixedly connected to the housing, and a surface formed by the mesh cover is a first surface; A driven wheel is fixedly connected to one side of the compressor and is located between the mesh cover and the compressor; Wherein, when viewed along a direction parallel to the first surface, the mesh cover is located on a side of the compressor facing away from the inverter.

6. The variable frequency driven air compressor according to claim 5, characterized in that: Observing along a direction parallel to the first surface, the compressor, the motor, and the air pressure sensor are sequentially arranged on the housing.

7. The variable frequency driven air compressor according to claim 5, characterized in that: The motor also includes: A transmission wheel, fixedly connected to one side of the motor and located between the mesh cover and the motor; Wherein, the motor drives the transmission wheel to rotate along a first direction.

8. The variable frequency driven air compressor according to claim 7, characterized in that: The air compressor also includes: A crawler track, wherein the crawler track is fixedly connected to the driving wheel and the driven wheel; Wherein, when viewed in a direction perpendicular to the first surface, the driving wheel drives the driven wheel to rotate along the first direction via the track.

9. The variable frequency driven air compressor according to claim 8, characterized in that: The driven wheel is provided with blades, and the blades rotate along the first direction to form an airflow and blow it toward the compressor to cool the compressor.

10. The variable frequency driven air compressor according to claim 1, characterized in that: The frequency converter is provided with an on button and a stop button, and the operation of the air compressor is controlled by the on button and the stop button.

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