Intake start control structure of a screw supercharger

Abstract

This application provides an intake start-up control structure for a screw supercharger, including an intake valve, a supercharger main unit, and an oil-gas separator connected in sequence. The outlet of the oil-gas separator is connected to the closing chamber of the intake valve via a pneumatic control pipeline. The front end of the intake port of the intake valve is connected to the closing chamber of the intake valve via an auxiliary control pipeline A, on which an auxiliary solenoid valve and a check valve A are connected in series. The opening chamber of the intake valve is connected to the atmosphere via an auxiliary control pipeline B, on which a check valve B and a throttling orifice are connected in series. When the system starts, opening the auxiliary solenoid valve introduces the compressed gas at the front end of the intake valve into the closing chamber of the intake valve, assisting in closing the intake valve before the system pressure is established. The check valve B can exhaust gas to form a negative pressure during intake action, thereby further strengthening the closing action of the intake valve and realizing light-load start-up of the system. The control of the screw supercharger can be achieved with slight adjustments to the original pneumatic control pipeline, resulting in low modification costs.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor technology, specifically to an intake start control structure for a screw compressor. Background Technology

[0002] The intake pressure at the front end of the intake valve of a conventional air compressor is atmospheric pressure (1 bar absolute pressure). However, the intake pressure at the front end of a screw compressor may be 4 to 6 bar. If the air control method of a conventional air compressor is used to start the intake valve of a screw compressor, the pressure difference between the negative pressure formed in the valve chamber and the intake pressure at the front end of the intake valve may be too large during startup. This may cause the intake valve to open too much and be difficult to close, resulting in a large system startup load and making it difficult or impossible to start the machine. Utility Model Content

[0003] In view of this, the present invention provides an intake start control structure for a screw compressor to solve the technical problem that if the screw compressor directly adopts the air control method of a conventional air compressor, it will be difficult to start the machine or even fail to start.

[0004] This utility model provides an intake start control structure for a screw compressor, including an intake valve, a compressor main unit, and an oil-gas separator. The outlet of the intake valve is connected to the intake end of the compressor main unit, and the outlet end of the compressor main unit is connected to the intake end of the oil-gas separator. The outlet end of the oil-gas separator is connected to the valve closing chamber of the intake valve through a pneumatic control pipeline. The front end of the intake port of the intake valve is connected to the valve closing chamber of the intake valve through an auxiliary control pipeline A. An auxiliary solenoid valve and a one-way valve A are connected in series on the auxiliary control pipeline A.

[0005] Optionally, the opening chamber of the intake valve is connected to the atmosphere through an auxiliary control line B, and a one-way valve B and a throttle orifice are connected in series on the auxiliary control line B.

[0006] Optionally, the pneumatic control pipeline is connected in series with a filter, a pressure reducing valve, a start solenoid valve, and a one-way valve C along its gas flow direction.

[0007] Optionally, the pneumatic control pipeline is connected in parallel with a shutdown vent valve, one end of which is connected to the outlet of the oil-gas separator, and the other end is connected between the start-up solenoid valve and the one-way valve C.

[0008] Optionally, the opening chamber of the intake valve is provided with an unloading hole, which is connected to the outlet end of the oil-gas separator through an unloading valve.

[0009] The present invention has the following beneficial effects:

[0010] 1. The front end of the intake port of the intake valve is connected to the valve closing chamber of the intake valve through auxiliary control line A. When the system starts, the compressed gas at the front end of the intake valve can be introduced into the valve closing chamber of the intake valve through auxiliary control line A to assist in closing the intake valve before the system pressure is established.

[0011] 2. The opening chamber of the intake valve is connected to the atmosphere through the auxiliary control line B. The one-way valve B on the auxiliary control line B can exhaust and form negative pressure when the intake is activated, thereby further strengthening the closing action of the intake valve and ultimately realizing the system's light-load start-up.

[0012] 3. By directly adding two auxiliary control lines to the existing air control lines, the conventional air compressor air control lines can be utilized to the maximum extent. Only minor adjustments are needed to achieve control of the screw compressor. The number of modified parts is small, the modification cost is low, and the economic value is high. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] The numbers in the diagram represent:

[0016] 1. Intake valve; 2. Booster compressor main unit; 3. Oil-gas separator; 4. Auxiliary solenoid valve; 5. Check valve A; 6. Check valve B; 7. Throttling orifice; 8. Filter; 9. Pressure reducing valve; 10. Start-up solenoid valve; 11. Check valve C; 12. Shutdown vent valve; 13. Unloading valve. Detailed Implementation

[0017] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1As shown, an embodiment of this utility model provides an intake start control structure for a screw compressor, including an intake valve 1, a compressor main unit 2, and an oil-gas separator 3. The outlet of the intake valve 1 is connected to the intake end of the compressor main unit 2, and the outlet end of the compressor main unit 2 is connected to the intake end of the oil-gas separator 3. The outlet end of the oil-gas separator 3 is connected to the valve closing chamber of the intake valve 1 through a pneumatic control pipeline, so that the pneumatic control pipeline can introduce the compressed gas separated by the oil-gas separator 3 into the valve closing chamber of the intake valve 1 as a control gas source.

[0019] The front end of the intake port of intake valve 1 is connected to the closing chamber of intake valve 1 through auxiliary control line A. An auxiliary solenoid valve 4 and a one-way valve A5 are connected in series on auxiliary control line A. Furthermore, the opening chamber of intake valve 1 is connected to the atmosphere through auxiliary control line B. A one-way valve B6 and a throttle orifice 7 are connected in series on auxiliary control line B.

[0020] When the system starts up, opening the auxiliary solenoid valve 4 introduces the compressed gas at the front end of the intake valve 1 into the closing chamber of the intake valve 1, assisting in closing the intake valve 1 before the system pressure is established; at the same time, the one-way valve B6 connected in series with the opening chamber of the intake valve 1 can exhaust to form a negative pressure when the intake action is performed, thereby further strengthening the closing action of the intake valve 1, and finally realizing the system light load start-up.

[0021] This utility model embodiment directly adds two auxiliary control pipelines to the original air control pipeline, which can make the most of the conventional air compressor air control pipeline. Only minor local adjustments are needed to achieve the control of the screw compressor. It involves fewer modified parts, lower modification costs, and higher economic value.

[0022] Since the auxiliary control pipeline A and auxiliary control pipeline B in this embodiment of the present invention are independent of each other and do not interfere with each other, theoretically there is no need to impose too many restrictions on the pneumatic control pipeline. The pneumatic control pipeline in this embodiment of the present invention can directly adopt the conventional pneumatic control pipeline structure, or it can be specifically designed according to the machine's operating conditions.

[0023] As an optional implementation, in this embodiment of the invention, a filter 8, a pressure reducing valve 9, a start solenoid valve 10, and a one-way valve C11 are connected in series along the gas flow direction in the pneumatic control pipeline. A shutdown vent valve 12 is connected in parallel to the pneumatic control pipeline. One end of the shutdown vent valve 12 is connected to the outlet of the oil-gas separator 3, and the other end is connected between the start solenoid valve 10 and the one-way valve C11. In addition, the opening chamber of the inlet valve 1 is also provided with an unloading hole, which is connected to the outlet of the oil-gas separator 3 through an unloading valve 13.

[0024] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An intake start control structure for a screw compressor, comprising an intake valve, a compressor main unit, and an oil-gas separator, wherein the outlet of the intake valve is connected to the intake end of the compressor main unit, the outlet end of the compressor main unit is connected to the intake end of the oil-gas separator, and the outlet end of the oil-gas separator is connected to the valve closing chamber of the intake valve via a pneumatic control pipeline; characterized in that: The front end of the air inlet of the air inlet valve is connected to the valve closing chamber of the air inlet valve through an auxiliary control pipeline A. An auxiliary solenoid valve and a one-way valve A are connected in series on the auxiliary control pipeline A.

2. A structure for controlling the start of the intake of a screw supercharger according to claim 1, characterized in that: The intake valve's opening chamber is connected to the atmosphere via an auxiliary control line B, which is connected in series with a one-way valve B and a throttle orifice.

3. A structure for controlling the start of the intake of a screw supercharger according to claim 1, characterized in that: The pneumatic control pipeline is connected in series with a filter, a pressure reducing valve, a start solenoid valve, and a check valve C along its gas flow direction.

4. A structure for controlling the start of the intake of a screw supercharger according to claim 3, characterized in that: The pneumatic control pipeline is connected in parallel with a shutdown vent valve. One end of the shutdown vent valve is connected to the outlet of the oil-gas separator, and the other end is connected between the start solenoid valve and the one-way valve C.

5. A structure for controlling the start of the intake of a screw supercharger according to claim 1, characterized in that: The intake valve has an unloading hole in its opening chamber, and the unloading hole is connected to the outlet of the oil-gas separator through the unloading valve.

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