Air-tight seal air supply system of dry screw compressor

Abstract

The utility model provides an air-tight seal air supply system of a dry screw compressor, which is characterized in that a pressure container provided with a pressure sensor, a pressure regulating valve, an air charging solenoid valve and an air discharging solenoid valve is connected between an air source device and an air inlet of a dry screw main machine. The controller is linked with the pressure sensor in real time, the controller is used for electrically controlling the opening and closing actions of the inflating and deflating electromagnetic valves to realize the dual pressure stabilization purpose of the gas pressure in the pressure container, and the pressure in the buffer tank is always stabilized in a set pressure range, so that the air-tight sealing efficiency of the main engine is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of dry screw compressors, in particular to an air-sealed air supply system for dry screw compressors. Background Art

[0002] With the advancement of science and technology, some industries have higher and higher requirements for the quality of gas used, and the demand for dry screw compressors is also increasing. How to ensure that the compressed air produced by dry screw compressors is pure and oil-free has become a problem that manufacturers need to solve. At present, the application of main engine air sealing technology can greatly improve the quality of compressed air. However, in some occasions where the screw fan unit has a large gas volume, high gas pressure, or the pressure in the pipeline exceeds the exhaust setting, the pressure control component cannot accurately control the air pressure in the air pipeline due to excessive fluctuations in the pressure in the pipeline and too frequent fluctuations. Since the stability of the sealing gas pressure directly affects the air sealing effect, it is very important to develop a stable, adjustable and controllable pressure-stabilized air supply system for dry screw compressor air seals. Utility Model Content

[0003] The utility model aims to provide a dry screw compressor air seal air supply system to solve the above problems.

[0004] In order to solve the above technical problems, the utility model provides a dry screw compressor air-sealed air supply system including a pressure stabilizing part and an oil-gas separation part, wherein the pressure stabilizing part includes an air source device and a buffer tank provided with a pressure regulating valve and an air release solenoid valve; the buffer tank is a pressure vessel, an input end of which is connected to the air source device through an air charging solenoid valve, and an output end of which is connected to a dry screw main unit on the oil-gas separation part through a first joint;

[0005] The inflation solenoid valve and the deflation solenoid valve are connected to the signal output end of the controller, and the signal input end of the controller is connected to the pressure sensor.

[0006] In a preferred embodiment: the number of the first connectors is not less than 1.

[0007] In a preferred embodiment: the inflation solenoid valve and the deflation solenoid valve are respectively connected to the buffer tank via a second joint fixedly connected to the buffer tank.

[0008] In a preferred embodiment: the fixing is welding.

[0009] In a preferred embodiment: the oil-gas separation unit also includes an oil tank and an oil mist separator.

[0010] In a preferred embodiment: the first input end of the oil tank is connected to the output end of the dry screw main unit through an air pipe, and the second input end thereof is connected to the oil mist separator through an oil pipe;

[0011] The output end of the oil tank is connected to the input end of the oil mist separator.

[0012] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0013] The utility model provides an air-sealed air supply system for a dry screw compressor, in which a buffer tank equipped with a pressure sensor, a pressure regulating valve and a charging and discharging electromagnetic valve is connected between an external wind source device and an air inlet of a dry screw main engine. When the pressure flow fluctuation is too large and causes the pre-control failure of the pressure regulating valve, the opening and closing actions of the charging and discharging electromagnetic valves are electrically controlled by adjusting the controller, thereby achieving the purpose of double pressure stabilization protection. The controller and the pressure sensor are linked in real time to keep the pressure in the buffer tank always stable within the set pressure range, thereby providing stable sealing gas for the compression main engine and ensuring the air-sealing effect of the main engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an axial view of the buffer tank of the embodiment of the utility model;

[0015] Figure 2 It is a front view of a buffer tank according to an embodiment of the utility model;

[0016] Figure 3 It is a side view of a buffer tank according to an embodiment of the utility model;

[0017] Figure 4 It is a top view of the buffer tank of the embodiment of the utility model;

[0018] Figure 5 It is a flow chart of the air-sealed air supply system of the utility model embodiment. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0022] Since the dry screw compressor only ensures that the air is oil-free during compression, the bearings and gears of the main engine still need oil for lubrication and cooling. When the compressor is working, it is necessary to prevent the lubricating oil in the bearing chamber and gear box from entering the air compression chamber and contaminating the compressed air. Therefore, in addition to the labyrinth seal and carbon ring seal, an air seal is also added between the bearing chamber or gear box and the compression chamber when designing the dry screw main engine 3. The air seal mentioned here is actually a method of connecting oil-free compressed air of a certain pressure between the bearing chamber or gear box and the compression chamber of the dry screw main engine 3, and using the pressure difference between the physical properties of compressed air and lubricating oil to prevent lubricating oil from entering the air compression chamber.

[0023] It is not difficult to see from the working principle of the air seal that the air source pressure connected to the dry screw main unit 3 must be kept within a certain range, otherwise the air seal may fail. In view of this, the utility model proposes a dry screw compressor air seal air supply system, which includes a pressure stabilizing part and an oil-gas separation part, wherein the pressure stabilizing part refers to Figure 1-4 As shown, it comprises a wind source device 1 and a buffer tank 2 provided with a pressure regulating valve 201, a deflation solenoid valve 202, and an air charging solenoid valve 203. When the external pressure air source from the wind source device 1 is connected to the buffer tank 2 through the air charging solenoid valve 203, the air charging solenoid valve 203 on the buffer tank 2 is opened, and the compressed air enters the buffer tank 2 and enters the main unit 3 through the branch air pipe. The pressure in the buffer tank 2 can be initially controlled to the optimal pressure value we want through the pressure regulating valve 201 on the buffer tank 2, so as to ensure the air sealing effect of the air seal on the main unit 3.

[0024] However, the external gas source often has large pressure fluctuations due to various factors. In some cases, the supply pressure value may far exceed the controllable range of the pressure regulating valve 201. In view of this, the utility model is linked to the buffer tank 2 to set a pressure sensor 206 for monitoring the pressure in the tank. The pressure sensor 206 can monitor the pressure in the buffer tank 2 in real time and feedback to the controller of the whole machine. The controller adjusts the opening and closing of the inflation solenoid valve 203 and the deflation solenoid valve 202 according to the pressure feedback. In other words, the opening and closing of the inflation solenoid valve 203 and the deflation solenoid valve 202 can also be set independently on the controller. When the pressure fluctuation supplied by the wind source device 1 is so large that the pressure regulating valve 201 cannot adjust it, the inflation and deflation solenoid valves will intervene to make a second adjustment. Specifically, when the pressure of the buffer tank 2 is lower than the preset pressure value, the inflation solenoid valve 203 opens to replenish the buffer tank 2, and when the pressure in the buffer tank 2 is higher than the preset pressure value, the inflation solenoid valve 203 closes. Similarly, when the pressure in the buffer tank 2 is higher than the preset pressure value, the deflation solenoid valve 202 is opened to release air, and when the pressure in the buffer tank 2 is lower than the preset pressure value, the deflation solenoid valve 202 is closed. The pressurized gas flowing into the buffer tank 2 is adjusted by the mutual coordination of the pressure regulating valve 201, the inflation solenoid valve 203, and the deflation solenoid valve 202. Even in the case of large fluctuations in the external gas source, the sealing gas pressure in the buffer tank 2 can be kept stable within the required range, providing the host 3 with a stable sealing gas supply environment that can be flexibly adjusted and independently set. The pressure in the buffer tank 2 is further kept stable through dual control, thereby effectively ensuring the gas sealing effect of the host 3.

[0025] From the connection relationship between the components of the buffer tank 2, the inflation solenoid valve 203 and the deflation solenoid valve 202 are mechanically connected to the buffer tank 2 through the second joints 205 welded on the buffer tank 2, and the number of the second joints 205 is not less than 2. Since the output end of the gas in the buffer tank 2 is connected to the air inlet of the host 3 through the first joint 204, considering the ease of operation when connecting between the components, the first joint 204 is set as a labor-saving joint in this embodiment, and the number of the first joints 204 is determined according to the number of the hosts 3 used in conjunction. The buffer tank 2 is a pressure vessel, which is also provided with a pressure sensor 206. The output end of the pressure sensor 206 is connected to the signal input end of the external controller, and the output end of the controller realizes the electrical control of the free adjustment and setting of the air pressure value in the tank by connecting the inflation solenoid valve 203 and the deflation solenoid valve 202 respectively.

[0026] refer to Figure 5In addition to the dry screw main unit 3 connected to the buffer tank 2 through an air pipe, the oil-gas separation unit also includes an oil mist separator 5 and an oil tank 4. From the connection relationship, the first input end of the oil tank 4 is connected to the output end of the dry screw main unit 3 through an air pipe, the second input end of the oil tank 4 is connected to the oil mist separator 5 through an oil pipe, and its output end is connected to the input end of the oil mist separator 5 through an air pipe. After the constant-pressure airflow from the voltage stabilizing unit passes through the dry screw main unit 3, the airflow carrying oil mist is transported along the air pipe to the oil mist separator 5 for oil-gas separation, and the separated oil flows back to the oil tank 4 along the oil pipe connected between the oil mist separator 5 and the oil tank 4 for recovery, so as to prevent the lubricating oil in the bearing chamber and the gear box from directly entering the air compression chamber to pollute the compressed air when the dry screw compressor is working.

[0027] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A dry screw compressor air seal air supply system, comprising a pressure stabilizing part and an oil-gas separation part, characterized in that: The pressure stabilizing part includes a wind source device and a buffer tank provided with a pressure regulating valve and a deflation solenoid valve; the buffer tank is a pressure vessel, the input end of which is connected to the wind source device through the inflation solenoid valve, and the output end of which is connected to the dry screw main unit on the oil-gas separation part through the first joint; The inflation solenoid valve and the deflation solenoid valve are connected to the signal output end of the controller, and the signal input end of the controller is connected to the pressure sensor.

2. A dry screw compressor air seal air supply system according to claim 1, characterized in that: The number of the first connectors is no less than 1.

3. A dry screw compressor air seal air supply system according to claim 1, characterized in that: The inflation solenoid valve and the deflation solenoid valve are respectively connected to the buffer tank via a second joint fixedly connected to the buffer tank.

4. A dry screw compressor air seal air supply system according to claim 3, characterized in that: The fixing is welding.

5. The dry screw compressor air seal air supply system according to claim 1, characterized in that: The oil-gas separation unit also includes an oil tank and an oil mist separator.

6. A dry screw compressor air seal air supply system according to claim 5, characterized in that: The first input end of the oil tank is connected to the output end of the dry screw main unit through an air pipe, and the second input end thereof is connected to the oil mist separator through an oil pipe; The output end of the oil tank is connected to the input end of the oil mist separator.

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