Power frequency and frequency conversion oil-free screw blower

Abstract

The utility model relates to a power frequency and frequency conversion oil-free screw air blower which comprises a safety protection assembly, a screw main machine, an air filtering assembly, an exhaust noise reduction assembly, a driving source and a lubricating oil assembly, the air filtering assembly comprises an air filter, and the exhaust noise reduction assembly comprises an exhaust silencer. The safety protection assembly comprises a safety valve, a temperature detection element and a pressure detection element; the lubricating oil assembly comprises an oil tank, an oil pump, an air cooling type cooling element and an oil filtering element. The variable-frequency operation mode and the power-frequency operation mode are arranged on the driving source, dual-mode setting is achieved, and the situation that the variable-frequency operation mode is switched to the power-frequency operation mode to work when the variable-frequency operation mode is abnormal can be avoided. According to the power frequency and frequency conversion oil-free screw blower, safe operation of the screw main machine is ensured through the safety protection assembly, the cooling effect of lubricating oil in the screw main machine is ensured through the air cooling type cooling element, and therefore the problems that no safety protection exists in the working process of the oil-free screw blower, and the lubricating oil cooling effect is poor are avoided; and the working efficiency is low.

Description

Technical Field

[0001] The utility model relates to the technical field of blowers, in particular to an industrial variable frequency oil-free screw blower. Background Art

[0002] Oil-free twin-screw screw blowers are divided into single-screw and twin-screw types. Oil-free screw blowers are generally composed of outer cover, host, motor, air filter, exhaust muffler, oil pump tank and oil filter. Among them, the screw host is mainly composed of casing, screw rotor, synchronous gear, bearing, shaft seal and other main components. The operation of oil-free screw blower is divided into three processes: suction process, compression process and exhaust process. The oil-free screw blower has a simple and stable structure and is widely used in aeration, air-water backwash, oxidation desulfurization, fluidization / homogenization process, pneumatic conveying and other projects.

[0003] Existing oil-free screw blowers have no safety protection during operation and poor lubricating oil cooling, resulting in low efficiency. If the inverter fails, the blower will not be able to supply air normally. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art and solve the problems of low working efficiency caused by the lack of safety protection during operation of the existing oil-free screw blower and poor cooling effect of lubricating oil, the utility model provides an industrial variable frequency oil-free screw blower.

[0005] The technical solution of the utility model is as follows:

[0006] A variable frequency oil-free screw blower, comprising a safety protection component, an exhaust silencer component, a screw main unit, and an air filter component and a lubricating oil component connected to the screw main unit, the air filter component comprising an air filter, the exhaust silencer component comprising an exhaust muffler, the safety protection component comprising a safety valve, a temperature detection element, and a pressure detection element, the air filter being connected to the air inlet of the screw main unit through a connecting pipe, the exhaust muffler being connected to the exhaust port of the screw main unit through a connecting pipe, the safety valve being installed on the exhaust muffler, and the temperature detection element being installed at the exhaust port of the screw main unit; the lubricating oil component comprising an oil tank, an oil pump connected to the oil tank, an air-cooled cooling element connected to the oil pump, and an oil filter element connected to the air-cooled cooling element, the oil filter element being connected to the oil inlet of the screw main unit, and the oil outlet of the screw main unit being connected to the oil tank; the screw main unit is also connected to a driving source, and the driving source is provided with a variable frequency operation mode and a power frequency operation mode for dual-mode operation.

[0007] Preferably, the safety protection component further includes a safety switch connected between the driving source and the screw main unit, and the safety switch can be selected as a circuit breaker.

[0008] Preferably, the screw main unit includes a pair of meshing spiral rotors.

[0009] Preferably, a check valve is provided on the connecting pipe between the exhaust muffler and the exhaust port of the screw main unit.

[0010] Preferably, the air-cooled cooling element is a plate-fin air-cooled cooler.

[0011] Preferably, the air filter comprises an air inlet, and a paper filter element is provided at the air inlet.

[0012] Preferably, the paper filter element is provided with a plurality of micropores for filtering solid impurities.

[0013] Preferably, the temperature detection element is a temperature sensor.

[0014] Preferably, the pressure detection element is a pressure sensor or a pressure transmitter.

[0015] Preferably, the industrial variable frequency oil-free screw blower includes a PLC controller for controlling the driving source to switch from the variable frequency operation mode to the industrial frequency operation mode or from the industrial frequency operation mode to the variable frequency operation mode to operate.

[0016] The beneficial effects of the utility model are as follows: compared with the prior art, the industrial variable frequency oil-free screw blower includes a safety protection component, an exhaust silencer component, a screw main unit, and an air filter component and a lubricating oil component connected to the screw main unit, the air filter component includes an air filter, the exhaust silencer component includes an exhaust muffler, the safety protection component includes a safety valve, a temperature detection element and a pressure detection element, the air filter is connected to the air inlet of the screw main unit through a connecting pipe, the exhaust muffler is connected to the exhaust port of the screw main unit through a connecting pipe, the safety valve is installed on the exhaust muffler, and the temperature detection element is installed at the exhaust port of the screw main unit; the lubricating oil component includes an oil tank, an oil pump connected to the oil tank, an air-cooled cooling element connected to the oil pump, and an oil filter element connected to the air-cooled cooling element, the oil filter element is connected to the oil inlet of the screw main unit, and the oil outlet of the screw main unit is connected to the oil tank; the screw main unit is also connected to a driving source, and the driving source is provided with a variable frequency operation mode and an industrial frequency operation mode for dual-mode operation. The industrial variable frequency oil-free screw blower ensures the safe operation of the screw host through a safety valve, temperature detection element and pressure detection element, and ensures the cooling effect of the lubricating oil in the screw host through an air-cooled cooling element, thereby avoiding the lack of safety protection during the operation of the oil-free screw blower and poor cooling effect of the lubricating oil, which leads to low working efficiency.

[0017] The industrial variable frequency oil-free screw blower adopts a dual-mode control method of variable frequency operation mode and industrial frequency operation mode of the driving source. When the driving source fails in the variable frequency operation mode, the PLC controller can switch to the industrial frequency operation mode with one click, thereby not affecting the operation of the industrial variable frequency oil-free screw blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the industrial variable frequency oil-free screw blower described in the utility model. DETAILED DESCRIPTION

[0019] In order to make the invention purpose, technical scheme and technical effect of the utility model more clear, the utility model is further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] Please refer to Figure 1 The utility model of the variable frequency oil-free screw blower includes a safety protection component, an exhaust silencer component, a screw host 20, and an air filter component and a lubricating oil component connected to the screw host. The air filter component includes an air filter 11, the exhaust silencer component includes an exhaust silencer 12, the safety protection component includes a safety valve 21, a temperature detection element and a pressure detection element. The air filter 11 is connected to the air inlet of the screw host 20 through a connecting pipe 10, the exhaust silencer 12 is connected to the exhaust port of the screw host 20 through a connecting pipe 10, and the safety valve 21 is installed on the exhaust muffler 12, and the temperature detection element is installed at the exhaust port of the screw main unit 20; the lubricating oil assembly includes an oil tank 31, an oil pump 32 connected to the oil tank 31, an air-cooled cooling element 33 connected to the oil pump 32, and an oil filter element 34 connected to the air-cooled cooling element 33, the oil filter element 34 is connected to the oil inlet of the screw main unit 20, and the oil outlet of the screw main unit 20 is connected to the oil tank 31; the screw main unit 20 is also connected to the drive source 24, and the drive source 24 is provided with a variable frequency operation mode and an industrial frequency operation mode for dual-mode operation.

[0021] It is further explained that if Figure 1As shown, the air filter 11 includes an air inlet 13, and a paper filter element is provided at the air inlet 13. The paper filter element is provided with several micropores for filtering solid impurities. In this embodiment, the air filter 13 is mainly composed of a paper filter element and a shell. Air enters from the air inlet 13 and passes through the micropores of the paper filter element, so that solid impurities such as dust are filtered on the outer surface of the paper filter element and do not enter the spiral main unit 20 to prevent wear of relative moving parts. The air filter 11 can also be cleaned or the paper filter element replaced in time according to the use environment and usage time. The paper filter element can be cleaned by removing the paper filter element from the shell of the air filter 11 and gently tapping its upper and lower end surfaces, or by gently blowing away with compressed air to clean the dust and dirt on the paper filter element.

[0022] Please refer to Figure 1 In an embodiment of the present invention, a safety valve 21 is installed on the exhaust muffler 12. When the exhaust pressure at the exhaust port of the screw main unit 20 rises to the opening pressure of the safety valve 21, the gas at the exhaust port of the screw main unit 20 pushes open the valve core of the safety valve 21 and is ejected into the atmosphere, causing the pressure in the pipeline connected to the output end of the exhaust muffler 12 to drop. When the pressure drops to the closing pressure of the safety valve 21, the safety valve 21 automatically closes, allowing the oil-free screw blower to achieve safe exhaust through the industrial variable frequency oil-free screw blower.

[0023] Please refer to Figure 1 In the embodiment of the present invention, the temperature detection element can be a temperature sensor. The pressure detection element can be a pressure sensor or a pressure transmitter, and the pressure detection element is disposed in the screw main unit 20.

[0024] To further explain, when the exhaust temperature of the screw main unit 20 exceeds a set value, a temperature sensing element connected to the exhaust port of the screw main unit 20 sends a signal, causing the screw main unit 20 to shut down urgently. When the actual exhaust pressure of the screw main unit 20 exceeds the set upper exhaust pressure limit, the pressure sensing element transmits a signal to the PLC controller, which in turn cuts off the power to the drive source 24, shutting down the screw main unit 20.

[0025] Please refer to Figure 1 In an embodiment of the present invention, the air-cooled cooling element 33 can be selected as a plate-fin air-cooled cooler.

[0026] To further clarify, the plate-fin air-cooled cooler is welded from an aluminum alloy. Its function is to cool the lubricating oil in the screw main unit 20. Heat from the lubricating oil is removed by cooling air through forced convection within the air-cooled cooling element 33. During air-cooled heat exchange, the thermal resistance on the air side plays a dominant role, so ensuring good cooling of the lubricating oil is crucial. In this embodiment, the oil tank 31 is used to hold the lubricating oil used to cool the screw main unit 20.

[0027] Please refer to Figure 1 In an embodiment of the present invention, the oil filter element can be selected as an oil filter.

[0028] It is further explained that the oil filter is used to remove impurities in the lubricating oil, keep the lubricating oil clean, and protect the operation of the bearings and gears in the screw main unit 20.

[0029] Please refer to Figure 1 In the embodiment of the present invention, the driving source 24 can be a permanent magnet motor. The working modes of the driving source 24 include a variable frequency operation mode and a power frequency operation mode.

[0030] It is further explained that when the driving source 24 fails when operating in the variable frequency operation mode, the driving source 24 can be switched from the variable frequency operation mode to the industrial frequency operation mode to continue to provide transmission capacity to the driving source 24, thereby avoiding the shutdown of the industrial frequency oil-free screw blower, which causes the entire industrial frequency oil-free screw blower to be unable to be used normally, and does not affect the normal use of the industrial frequency oil-free screw blower.

[0031] The utility model provides an industrial variable frequency oil-free screw blower, comprising a safety protection component, a screw main unit, and an air filter component and a lubricating oil component connected to the screw main unit, the air filter component comprising an air filter and an exhaust muffler, the safety protection component comprising a safety valve and a temperature detection element, the air filter being connected to the air inlet of the screw main unit through a connecting pipe, the exhaust muffler being connected to the exhaust port of the screw main unit through a connecting pipe, the safety valve being installed on the exhaust muffler, and the temperature detection element being installed at the exhaust port of the screw main unit; the lubricating oil component comprising an oil tank, an oil pump connected to the oil tank, an air-cooled cooling element connected to the oil pump, and an oil filter component connected to the air-cooled cooling element, the oil filter component being connected to the oil inlet of the screw main unit, and the oil outlet of the screw main unit being connected to the oil tank. The industrial variable frequency oil-free screw blower ensures the safe operation of the screw host through a safety valve and a temperature detection element, and ensures the cooling effect of the lubricating oil in the screw host through an air-cooled cooling element, thereby avoiding the lack of safety protection during the operation of the oil-free screw blower and the poor cooling effect of the lubricating oil, which leads to low working efficiency.

[0032] Please refer to Figure 1 In one embodiment of the present invention, the safety protection component further includes a safety switch connected between the driving source 24 and the screw main unit 20.

[0033] It is further explained that the power supply of the screw main unit 20 is cut off by the safety switch, thereby further ensuring the safe operation of the screw main unit 20. The safety switch can be selected as a circuit breaker.

[0034] Please refer to Figure 1 In order to ensure that in one embodiment of the present utility model, a check valve 40 is provided on the connecting pipe between the exhaust muffler 12 and the exhaust port of the screw main unit 20.

[0035] It is further explained that the check valve 40 is used to prevent the gas at the exhaust port of the screw main unit 20 from flowing back into the screw main unit 20 .

[0036] Please refer to Figure 1 In one embodiment of the present invention, the screw main unit 20 includes a pair of meshing spiral rotors.

[0037] To further clarify, the screw main unit 20 can use a coupling or coaxial drive as the main drive to drive the screw rotor to compress air. Air enters the screw compression chamber through an air filter for compression. During rotation, air is drawn in from the intake end, compressed, and discharged to the exhaust end. The compression chamber of the screw main unit 20 is lubricated, and the two meshing rotors are synchronized by synchronous gears.

[0038] The above description further details the present invention in conjunction with specific preferred embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. A person skilled in the art of the present invention will appreciate that its architecture is flexible and adaptable, allowing for the development of a series of products without departing from the present invention. Simple deductions or substitutions should be considered within the scope of patent protection for the present invention as defined by the submitted claims.

Claims

1. An industrial variable frequency oil-free screw blower, characterized in that: It includes a safety protection component, an exhaust silencer component, a screw main unit, and an air filter component and a lubricating oil component connected to the screw main unit, the air filter component includes an air filter, the exhaust silencer component includes an exhaust muffler, the safety protection component includes a safety valve, a temperature detection element and a pressure detection element, the air filter is connected to the air inlet of the screw main unit through a connecting pipe, the exhaust muffler is connected to the exhaust port of the screw main unit through a connecting pipe, the safety valve is installed on the exhaust muffler, and the temperature detection element is installed at the exhaust port of the screw main unit; the lubricating oil component includes an oil tank, an oil pump connected to the oil tank, an air-cooled cooling element connected to the oil pump, and an oil filter element connected to the air-cooled cooling element, the oil filter element is connected to the oil inlet of the screw main unit, and the oil outlet of the screw main unit is connected to the oil tank; the screw main unit is also connected to a drive source, and the drive source is provided with a variable frequency operation mode and an industrial frequency operation mode for dual-mode operation.

2. The industrial variable frequency oil-free screw blower according to claim 1, characterized in that: The screw main unit includes a pair of meshing spiral rotors.

3. The industrial variable frequency oil-free screw blower according to claim 1, characterized in that: A check valve is provided on the connecting pipe between the exhaust muffler and the exhaust port of the screw main unit.

4. The industrial variable frequency oil-free screw blower according to any one of claims 1 to 3, characterized in that: The air-cooled cooling element is a plate-fin air-cooled cooler.

5. The industrial variable frequency oil-free screw blower according to any one of claims 1 to 3, characterized in that: The air filter comprises an air inlet, and a paper filter element is arranged at the air inlet.

6. The industrial variable frequency oil-free screw blower according to any one of claims 1 to 3, characterized in that: The temperature detection element is a temperature sensor.

7. The industrial variable frequency oil-free screw blower according to any one of claims 1 to 3, characterized in that: The pressure detection element is a pressure sensor or a pressure transmitter.

8. The industrial variable frequency oil-free screw blower according to any one of claims 1 to 3, characterized in that: It includes a PLC controller for controlling the driving source to switch from the variable frequency operation mode to the industrial frequency operation mode or from the industrial frequency operation mode to the variable frequency operation mode.

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