Air inlet valve structure of screw compressor

Abstract

The air inlet valve structure of the screw compressor comprises an air inlet valve body, a valve plate and a driving assembly, the valve plate is rotatably installed in an air inlet channel of the air inlet valve body, and the driving assembly is used for driving the valve plate to rotate in a reciprocating mode so as to open or close the air inlet channel; the air inlet side and the air outlet side of the valve plate are communicated through the bypass pipeline, and when the valve plate is closed, a small amount of air can be fed through the bypass pipeline so as to maintain the minimum tank pressure of the compressor; a stop valve is arranged on the bypass pipeline, and the air inlet flow of the bypass pipeline can be adjusted according to the discharge flow of the rear-end discharge pipeline, so that the vacuum degree of the air outlet side of the valve plate and the minimum tank pressure are maintained within the required range.

Description

Technical Field

[0001] The utility model relates to the field of air compressors, and particularly relates to an air inlet valve structure of a screw compressor. Background Art

[0002] As an important part of the compressor, the air inlet valve controls the loading and unloading of the entire compressor. Currently, in a commonly used air inlet valve structure of a screw compressor, holes are opened on the valve plate of the air inlet valve so that when the compressor starts and the valve plate is not opened, a small amount of air can enter through the reserved holes to start the compressor without load and build the tank pressure at the same time; meanwhile, when the compressor unloads and the valve plate is closed, an internal circulation of the system is established through the reserved holes to maintain the minimum tank pressure so that the lubricating oil can circulate and lubricate. However, due to factors such as the size and number of the reserved holes and the diameter of the air control and relief pipeline at the rear end, sometimes the vacuum degree under the valve plate of the air inlet valve is too high, and the minimum tank pressure is too high and cannot be reduced to the required range. Content of the Utility Model

[0003] In view of this, an embodiment of the utility model provides an air inlet valve structure of a screw compressor to solve the technical problem that the existing structure with holes on the valve plate is difficult to meet the requirement of the compressor to maintain the minimum tank pressure.

[0004] An air inlet valve structure of a screw compressor provided by an embodiment of the utility model includes:

[0005] An air inlet valve body, in which an air inlet channel is formed;

[0006] A valve plate, which is rotatably installed in the air inlet channel;

[0007] A driving assembly, which is in transmission connection with the valve plate and is used to drive the valve plate to reciprocally rotate to open or close the air inlet channel;

[0008] Wherein, the air inlet side and the air outlet side of the valve plate are connected through a bypass pipeline, and a stop valve is arranged on the bypass pipeline, and the stop valve is in an always-open state.

[0009] Optionally, the driving assembly includes a driving cylinder and a driving connecting rod; an installation frame is fixedly arranged on the outer side wall of the air inlet valve body, and one end of the driving cylinder far from its piston rod is hinged to the installation frame; one end of the driving connecting rod is hinged to the piston rod of the driving cylinder, and the other end is in transmission connection with the rotating shaft of the valve plate.

[0010] Optionally, a vent valve is further arranged on the air inlet valve body for relieving the internal pressure of the air inlet channel.

[0011] The embodiments of the present utility model have the following beneficial effects: The intake side and the outlet side of the valve plate are connected through a bypass pipeline. When the valve plate is closed, a small amount of air can enter through this bypass pipeline to maintain the minimum tank pressure of the compressor; A stop valve is provided on the bypass pipeline. When the compressor is operating under the condition of maintaining the minimum tank pressure, the intake air flow can be adjusted through the stop valve according to the discharge flow of the rear-end discharge pipeline, so as to maintain the vacuum degree and the minimum tank pressure on the outlet side of the valve plate within the required range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0014] Figure 2 is a cross-sectional view of an embodiment of the present utility model;

[0015] The numbers in the figure represent:

[0016] 1, intake valve body; 2, valve plate; 3, intake passage; 4, driving cylinder; 5, driving connecting rod; 6, mounting bracket; 7, vent valve; 8, bypass pipeline; 9, stop valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0018] Please refer to Figure 1 、 Figure 2 As shown, the embodiments of the present utility model provide an intake valve structure for a screw compressor, including an intake valve body 1, a valve plate 2 and a driving assembly; An intake passage 3 is formed in the intake valve body 1, and the valve plate 2 is rotatably installed in the intake passage 3; The driving assembly is in transmission connection with the valve plate 2 and is used to drive the valve plate 2 to reciprocally rotate to open or close the intake passage 3.

[0019] Specifically, the drive assembly in the embodiment of the present utility model includes a drive cylinder 4 and a drive link 5; an installation bracket 6 is fixedly arranged on the outer side wall of the intake valve body 1, and one end of the drive cylinder 4 away from its piston rod is hinged to the installation bracket 6; one end of the drive link 5 is hinged to the piston rod of the drive cylinder 4, and the other end is in transmission connection with the rotating shaft of the valve plate 2. Operating the drive cylinder 4 can drive the valve plate 2 to rotate through the drive link 5.

[0020] In addition, a vent valve 7 is provided on the intake valve body 1 in the embodiment of the present utility model. The vent valve 7 is communicated with the intake passage 3 and is used to relieve the internal pressure of the intake passage 3.

[0021] The intake side and the outlet side of the valve plate 2 are communicated through a bypass pipeline 8. A stop valve 9 is arranged on the bypass pipeline 8. The stop valve 9 is normally open. When the valve plate 2 is closed, a small amount of gas can be supplied to the outlet side of the valve plate 2 through the bypass pipeline 8 to maintain the minimum tank pressure of the compressor. At the same time, when the compressor is operating under the condition of maintaining the minimum tank pressure, the intake flow of the bypass pipeline 8 can be adjusted through the stop valve 9 according to the discharge flow of the rear discharge pipeline, so as to maintain the vacuum degree and the minimum tank pressure on the outlet side of the valve plate 2 within the required range. The diameter of the bypass pipeline 8 can be selected as large as possible within the use range of the intake valve, and a stop valve 9 with a diameter matching its gas volume range is connected. There is no need to adjust the number and size of the openings on the valve plate 2, nor to increase or decrease the diameter of the rear discharge pipeline. The structure is simple and convenient to adjust.

[0022] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present utility model; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An intake valve structure of a screw compressor, characterized in that: include: An intake valve body, wherein an intake passage is formed in the intake valve body; a valve plate rotatably mounted in the air inlet passage; A driving assembly, the driving assembly is drivingly connected to the valve plate and is used to drive the valve plate to reciprocate to open or close the air inlet passage; The air inlet side and the air outlet side of the valve plate are connected via a bypass pipeline, a stop valve is provided on the bypass pipeline, and the stop valve is in a normally open state.

2. The air intake valve structure of a screw compressor according to claim 1, characterized in that: The driving assembly includes a driving cylinder and a driving connecting rod; a mounting bracket is fixedly arranged on the outer wall of the intake valve body, and one end of the driving cylinder away from its piston rod is hinged to the mounting bracket; one end of the driving connecting rod is hinged to the piston rod of the driving cylinder, and the other end is transmission-connected to the rotating shaft of the valve plate.

3. The air intake valve structure of a screw compressor according to claim 1, characterized in that: The intake valve body is also provided with a vent valve for releasing the internal pressure of the intake passage.

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