Variable-frequency constant-pressure adjusting device of screw air compressor

Abstract

The utility model discloses a screw air compressor frequency conversion constant pressure adjusting device, including case, screw host, cooler, filter shell, be equipped with touch control display screen and frequency converter on the case, the screw host is installed in the case, and the screw host is equipped with oil cooling motor, the cooler is equipped with the oil cooling motor, and the filter shell is equipped with the oil cooling motor. The screw main engine and the oil cooling motor are communicated with an oil-gas separator, the oil-gas separator is provided with a circulating pipeline, the cooler is communicated with the oil-gas separator and the circulating pipeline, a sealing cover is arranged at the lower end of the filter shell, the filter shell is provided with a hook, a positioning seat is arranged on the filter, the positioning seat is rotationally connected with a handle, and the oil-gas separator is provided with an oil-gas outlet. The handle is connected with a hanging ring corresponding to the hook; and the rotating speed of the oil cooling motor is adjusted, so that the pressure of the air storage tank is maintained in a required constant pressure value range, and the pressure of an output air source is stabilized, so that the unloading time of the screw air compressor is shortened, the idle loss of the oil cooling motor is reduced, and more energy is saved.

Description

Screw air compressor frequency conversion constant pressure regulating device Technical Field

[0001] This utility model relates to the field of air compressor technology, specifically to a variable frequency constant pressure regulating device for screw air compressors. Background Technology

[0002] Screw air compressors have a wide range of applications. They compress air through the meshing rotation of male and female rotors, offering advantages such as high stability, high efficiency, low vibration, and low noise. To improve the purity of the output gas from a screw air compressor, a filter is typically used to filter the intake air. Common air filters are cylindrical, requiring the screws to be unscrewed for filter replacement, which is inconvenient for maintenance. Furthermore, the loading and unloading sequence of a screw air compressor is achieved by setting a gradient in the loading / unloading pressure band on the compressor itself. This results in significant system pressure fluctuations (large bandwidth) and energy waste, leading to long loading and unloading times and high power consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a variable frequency constant pressure regulating device for screw air compressors to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a screw air compressor variable frequency constant pressure regulating device, including a chassis, on which a touch screen and a frequency converter are installed. The frequency converter can flexibly control the high and low speed operation of the oil-cooled motor to save energy. The touch screen can display the air pressure and set the operating parameters of the screw air compressor.

[0005] The screw compressor is installed inside the chassis and has an oil-cooled motor installed on it. The screw compressor and the oil-cooled motor are connected by an oil-gas separator. The oil-gas separator is equipped with a circulation pipeline. The circulation pipeline, together with the cooler, cools the oil-cooled motor, improves the stability of the oil-cooled motor operation, and meets the requirements of low-temperature start-up and high-temperature continuous operation.

[0006] The cooler is connected to the oil-gas separator and the circulation pipeline. The cooler cools the cooling oil and the compressed air to ensure that the discharged air temperature is suitable.

[0007] The filter housing has a cover installed at its lower end and a hook. A positioning seat is installed on the filter and a handle is rotatably connected to the positioning seat. The handle is connected to a hanging ring corresponding to the hook. Rotating the handle allows for quick removal of the cover and convenient replacement of the filter element.

[0008] Furthermore, the chassis is equipped with two access doors. The access door on the left corresponds to the filter housing. An air inlet pipe communicating with the filter housing is provided on the side of the chassis. Opening the access door makes it convenient to inspect the filter housing and replace the filter element.

[0009] Furthermore, the cooler is connected to an air storage tank, the air storage tank is connected to an air supply network, and the frequency converter is connected to a first barometer and a second barometer. The first barometer and the second barometer are respectively connected to the air storage tank and the air supply network, which can detect the air storage tank and the air supply network and provide signal guidance for the operation of the oil-cooled motor.

[0010] Furthermore, the cooler includes a gas radiator and an oil radiator, and fans are installed on the gas radiator and the oil radiator. The air flows at high speed under the action of the fans to cool the gas radiator and the oil radiator, thereby reducing the temperature of the air and the cooling oil.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) The second barometer detects the pressure of the air supply network. The actual pressure of the air supply network is compared with the set reference pressure. The speed of the oil-cooled motor is adjusted to keep the pressure of the air tank within the required constant pressure range and stabilize the pressure of the output air source. This reduces the unloading time of the screw air compressor and the idling loss of the oil-cooled motor, making it more energy-efficient.

[0013] (2) Turn the handle to separate the hanging ring from the hook. At this time, the filter housing and the cover can be separated, and the cover can be quickly removed to facilitate the replacement of the filter element inside the filter housing. The operation is simple and quick, and maintenance is convenient.

[0014] (3) The cooling oil of the oil-cooled motor and the screw compressor is sent to the oil-gas separator. The cooling oil enters the oil cooling radiator for cooling, which can cool the oil-cooled motor and reduce the operating temperature of the screw compressor. The gas cooling radiator cools the compressed air, which can ensure that the air is at room temperature and meet the usage requirements. Attached Figure Description

[0015] Figure 1 is a structural schematic diagram of the chassis of this utility model;

[0016] Figure 2 is a structural diagram of the screw air compressor of this utility model;

[0017] Figure 3 is a schematic diagram of the connection between the filter housing and the cover of this utility model;

[0018] Figure 4 is a flowchart of the control process of the oil-cooled motor of this utility model.

[0019] In the diagram: 1. Chassis; 2. Inlet pipe; 3. Touch screen display; 4. Inspection door; 5. First barometer; 6. Gas storage tank; 7. Gas radiator; 8. Gas supply network; 9. Second barometer; 10. Filter housing; 11. Frequency converter; 12. Screw compressor; 13. Oil-cooled motor; 14. Circulation pipeline; 15. Temperature control valve; 16. Oil-gas separator; 17. Minimum pressure valve; 18. Fan; 19. Oil radiator; 20. Cover; 21. Hook; 22. Hanging ring; 23. Positioning seat; 24. Handle. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example:

[0022] Please refer to Figures 1-4. This utility model provides a technical solution: a variable frequency constant pressure regulating device for a screw air compressor, including a housing 1. The housing 1 protects the screw air compressor and provides a certain degree of anti-collision function. A touch screen display 3 and a frequency converter 11 are installed on the housing 1. The touch screen display 3 can view and set the parameters of the screw air compressor. The frequency converter 11 controls the operating status of the oil-cooled motor 13. The oil-cooled motor 13 can run on demand, reducing unnecessary high-speed operation and saving energy.

[0023] The screw compressor 12 is installed inside the housing 1, and an oil-cooled motor 13 is installed on the screw compressor 12. The screw compressor 12 and the oil-cooled motor 13 are connected by an oil-gas separator 16. The oil-gas separator 16 is equipped with a circulation pipe 14. The circulation pipe 14 sends the cooling oil of the oil-cooled motor 13 into the oil-gas separator 16, and also sends the cooling oil for lubrication and cooling of the screw compressor 12 into the oil-gas separator 16. The air discharged from the screw compressor 12 also enters the oil-gas separator 16 through the circulation pipe 14. The circulation pipe 14 sends the cooling oil in the oil-gas separator 16 to the oil cooler 19 for cooling. The cooling oil discharged from the oil cooler 19 is sent to the screw compressor 12 and the oil-cooled motor 13 for recycling.

[0024] The cooler is connected to the oil-gas separator 16 and the circulation pipeline 14, and the cooler cools the cooling oil and compressed air.

[0025] The filter housing 10 has a cover 20 installed at its lower end and a hook 21. A positioning seat 23 is installed on the filter housing, and a handle 24 is rotatably connected to the positioning seat 23. The handle 24 is connected to a hanging ring 22 corresponding to the hook 21. A cylindrical filter element is installed inside the filter housing 10, with its upper end in contact with the filter housing 10 and its lower end in contact with the cover 20, thus achieving a sealed installation of the cylindrical filter element. A sealing gasket can also be set between the cover 20 and the filter housing 10 to improve the sealing effect.

[0026] In this embodiment, as shown in Figure 1, the chassis 1 is equipped with two inspection doors 4. The left inspection door 4 is positioned corresponding to the filter housing 10. The side of the chassis 1 is provided with an air inlet pipe 2 that communicates with the filter housing 10. The filter housing 10 draws air through the air inlet pipe 2. Opening the left inspection door 4 facilitates the replacement of the cylindrical filter element. Opening the right inspection door 4 allows for the inspection of the screw compressor 123, the oil-cooled motor 13, the oil-gas separator 16, etc.

[0027] In this embodiment, as shown in Figure 1, the cooler is connected to an air storage tank 6, which can temporarily store compressed air to prevent the oil-cooled motor 13 from running continuously. The air storage tank 6 is connected to an air supply network 8, which transports the compressed air out for use.

[0028] In this embodiment, as shown in Figures 1 and 2, the frequency converter 11 is connected to a first barometer 5 and a second barometer 9. The first barometer 5 and the second barometer 9 are respectively connected to the air storage tank 6 and the air supply network 8. The first barometer 5 can detect the air pressure of the air storage tank 6 and view it through the touch screen 3. The second barometer 9 detects the air pressure of the air supply network 8, which facilitates the comparison of the air supply network 8 pressure with the set reference pressure, thereby adjusting the speed of the oil-cooled motor 13.

[0029] In this embodiment, as shown in Figure 2, a minimum pressure valve 17 is connected between the oil-gas separator 16 and the cooler. When the screw air compressor starts, the minimum pressure valve 17 can quickly establish the necessary circulating pressure to control the gas flow through the oil-gas separator filter element and prevent damage to the oil-gas separation effect. When the screw air compressor stops or runs under no-load, the pressure inside the oil-gas separator 16 drops, and the minimum pressure valve 17 can prevent gas from flowing back into the oil-gas separator 16, thus acting as a one-way valve.

[0030] In this embodiment, as shown in FIG2, the cooler includes a gas radiator 7 and an oil radiator 19. A fan 18 is installed on the gas radiator 7 and the oil radiator 19. The fan 18 accelerates the airflow through the gas radiator 7 and the oil radiator 19 to achieve a cooling effect. The gas radiator 7 is connected to the minimum pressure valve 17 of the oil-gas separator 16, and the oil radiator 19 is connected to the oil outlet of the oil-gas separator 16.

[0031] In this embodiment, as shown in Figure 2, the circulation pipeline 14 is equipped with a temperature control valve 15. The temperature control valve 15 senses the temperature of the cooling oil and adjusts the flow direction of the cooling oil to ensure sufficient lubrication during startup and prevent damage to the screw compressor 12 due to insufficient lubrication. When the oil temperature rises, the temperature control valve 15 opens the bypass circuit, allowing some of the cooling oil to pass through the oil cooler 19 to cool down before mixing with the direct-flow lubricating oil, thereby maintaining a stable oil temperature supply to the screw compressor 12 and the oil-cooled motor 13.

[0032] Specifically, during use, the oil-cooled motor 13 drives the screw compressor 12 to work. The screw compressor 12 draws in air filtered by the cylindrical filter element. After the air is compressed by the screw compressor 12, it is sent to the oil-gas separator 16. The oil-gas separator 16 separates the cooling oil from the air, ensuring that the pure air is sent to the air storage tank 6 for storage.

[0033] The cooling oil for the screw compressor 12 and the oil-cooled motor 13 enters the oil-gas separator 16 through the circulation pipe 14. The cooling oil flows into the oil cooling radiator 19, where it is cooled before flowing back to the screw compressor 12 and the oil-cooled motor 13 for use, thus achieving cooling and lubrication of the screw compressor 12 and cooling of the oil-cooled motor 13. The air discharged from the oil-gas separator 16 is cooled by the gas cooling radiator 7 and can be restored to room temperature.

[0034] The frequency converter 11 controls the operating status of the oil-cooled motor 13, enabling the screw air compressor to adjust the output frequency according to the actual air consumption to ensure stable air pressure and reduce reactive power consumption.

[0035] Based on the actual pressure of the gas supply network 8 detected by the second barometer 9, the actual pressure of the gas supply network 8 is compared with the set reference pressure, and the speed of the oil-cooled motor 13 is adjusted to maintain the pressure of the gas storage tank 6 at the required constant pressure value.

[0036] When air consumption increases and the actual pressure is lower than the set reference pressure, the output frequency of inverter 11 increases, and the speed of oil-cooled motor 13 increases. When air consumption decreases and the actual pressure is higher than the set reference pressure, the output frequency of inverter 11 decreases, and the speed of oil-cooled motor 13 decreases. Since the frequency of inverter 11 changes according to the actual load, it stabilizes the pressure of the output air source, thus reducing the unloading time of the screw air compressor and reducing the idling loss of oil-cooled motor 13, achieving the purpose of energy saving.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable frequency constant pressure regulating device for a screw air compressor, characterized in that, include: A chassis (1) is equipped with a touch screen (3) and a frequency converter (11); a screw motor (12) is installed inside the chassis (1) and an oil-cooled motor (13) is installed on the screw motor (12). The screw motor (12) and the oil-cooled motor (13) are connected to an oil-gas separator (16). The oil-gas separator (16) is equipped with a circulation pipeline (14); a cooler is connected to the oil-gas separator (16) and the circulation pipeline (14); a filter housing (10) is equipped with a cover (20) at the lower end of the filter housing (10). The filter housing (10) is provided with a hook (21). A positioning seat (23) is installed on the filter. The positioning seat (23) is rotatably connected to a handle (24). The handle (24) is connected to a hanging ring (22) corresponding to the hook (21).

2. The variable frequency constant pressure regulating device for a screw air compressor according to claim 1, characterized in that: The chassis (1) is equipped with two maintenance doors (4). The left maintenance door (4) is located corresponding to the filter housing (10). The side of the chassis (1) is provided with an air inlet pipe (2) that communicates with the filter housing (10).

3. The variable frequency constant pressure regulating device for a screw air compressor according to claim 1, characterized in that: The cooler is connected to an air storage tank (6), and the air storage tank (6) is connected to an air supply network (8).

4. The variable frequency constant pressure regulating device for a screw air compressor according to claim 3, characterized in that: The frequency converter (11) is connected to a first barometer (5) and a second barometer (9), which are respectively connected to the gas storage tank (6) and the gas supply network (8).

5. The variable frequency constant pressure regulating device for a screw air compressor according to claim 1, characterized in that: A minimum pressure valve (17) is connected between the oil-gas separator (16) and the cooler.

6. The variable frequency constant pressure regulating device for a screw air compressor according to claim 1, characterized in that: The cooler includes a gas radiator (7) and an oil radiator (19), and a fan (18) is mounted on the gas radiator (7) and the oil radiator (19).

7. The variable frequency constant pressure regulating device for a screw air compressor according to claim 6, characterized in that: The circulation pipeline (14) is equipped with a temperature control valve (15).

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