CN220748542U

CN220748542U - Balance disc structure of screw compressor

Info

Publication number: CN220748542U
Application number: CN202322207410.0U
Authority: CN
Inventors: 李敏; 王彪; 李少昂; 卞志远; 李佳骏
Original assignee: Shanghai Qiyao Screw Machinery Co ltd
Current assignee: Shanghai Qiyao Screw Machinery Co ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-04-09
Anticipated expiration: 2033-08-16

Abstract

A balance disc structure of a screw compressor comprises a shell, a rotor shaft, a balance disc and a pneumatic cylinder. The rotor shaft is rotatably arranged on the shell, the balance disc is fixed on the rotor shaft, and a high-pressure cavity and a low-pressure cavity are respectively formed on two sides of the balance disc. The pneumatic cylinder is arranged in the high-pressure cavity; the pneumatic cylinder comprises a cylinder body and an elastic diaphragm; the cylinder body is provided with an inner cavity with one end open, and the inner cavity is communicated with an exhaust port of the screw compressor through a pressure guide pipeline; the elastic diaphragm covers the opening of the inner cavity and is connected with the cylinder body, and the elastic diaphragm is abutted against the end face of the balance disc, which faces one end of the high-pressure cavity. The utility model has simple structure, wide application range, safe use and low energy consumption.

Description

Balance disc structure of screw compressor

Technical Field

The utility model relates to a balance disc structure of a screw compressor.

Background

Due to the structural characteristics of the screw compressor, the condition of overlarge axial force can occur when the screw compressor compresses gas with higher pressure. The prior art is solved by a method for enhancing the bearing capacity of the thrust bearing and increasing the oil pressure of the balance disc, wherein the oil pressure of the balance disc is applied to the balance disc through comb gap throttling around the balance disc, so that the effect of relieving the axial direction of the screw machine is achieved. Because the magnitude of the oil pressure determines the magnitude of the axial force which can be provided by the balance disc, when the variable working condition is switched, a very high control requirement is put forward on an oil circuit system of the balance disc, if the control is not good, the abrasion of auxiliary pushing of the screw compressor can be caused, and the risk of rotor abrasion exists under serious conditions.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a balance disc structure of a screw compressor, which has the advantages of simple structure, wide application range, safe use and low energy loss.

The balance disc structure of the screw compressor comprises a shell, a rotor shaft and a balance disc; the rotor shaft is rotatably arranged on the shell, the balance disc is fixed on the rotor shaft, and a high-pressure cavity and a low-pressure cavity are respectively formed at two sides of the balance disc; the balance disc structure is characterized by comprising a pneumatic cylinder, wherein the pneumatic cylinder is arranged in the high-pressure cavity; the pneumatic cylinder comprises a cylinder body and an elastic diaphragm; the cylinder body is provided with an inner cavity with one end open, and the inner cavity is communicated with an exhaust port of the screw compressor through a pressure guide pipeline; the elastic diaphragm covers the opening of the inner cavity and is connected with the cylinder body, and the elastic diaphragm is abutted against the end face of the balance disc, which faces one end of the high-pressure cavity.

The utility model has at least the following advantages and characteristics:

1. according to the embodiment of the utility model, a complex oil pressure control system is eliminated, the axial force is directly balanced by means of the exhaust pressure of the screw compressor through the elastic diaphragm, logic control is not needed, the structure of the whole device is simpler, and the realization cost is lower;

2. according to the embodiment of the utility model, the gas exhausted by the screw compressor is introduced into the closed pneumatic cylinder, so that the risk of gas leakage is reduced, the use safety can be ensured when the screw compressor is applied to combustible gas, the application range is widened, and the energy consumption is lower.

Drawings

Fig. 1 shows a schematic diagram of a balance disc structure of a screw compressor according to an embodiment of the present utility model.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples.

Please refer to fig. 1. The balance disc structure of the screw compressor according to the embodiment of the utility model comprises a shell 1, a rotor shaft 2, a balance disc 3 and a pneumatic cylinder 4.

The rotor shaft 2 is rotatably provided to the housing 1, the balance disc 3 is fixed to the rotor shaft 2, and a high-pressure chamber 11 and a low-pressure chamber 12 are formed on both sides of the balance disc 3, respectively.

In this embodiment, the balance disc 3 is sleeved at one end of the rotor shaft 2 and is in interference fit with the rotor shaft 2. In other embodiments, the balance disc 3 may be connected to the rotor shaft 2 by screwing, bolting, or the like.

The pneumatic cylinder 4 is arranged in the high-pressure chamber 11. The pneumatic cylinder 4 includes a cylinder body 41 and an elastic diaphragm 42. The cylinder 41 has an inner chamber 410 open at one end, and the inner chamber 410 communicates with the discharge port of the screw compressor through the pressure introduction pipe 5. The elastic diaphragm 42 covers the opening of the inner cavity 410 and is connected with the cylinder 41, and the elastic diaphragm 42 abuts against the end face of the balance disc 3 facing one end of the high pressure cavity 11.

In the present embodiment, the elastic diaphragm 42 is detachably connected to the cylinder 41. The detachable connection may be a bolt connection or the like, but is not limited thereto. The thickness of the elastic membrane is 0.3mm to 0.5mm, but the elastic membrane is not limited thereto, and a multi-layer elastic membrane design can be adopted. The elastic membrane 42 may be made of metal or the like.

The aforementioned casing 1 is a casing of the screw compressor 100. The rotor shaft 2 is a male rotor shaft or a female rotor shaft of a screw compressor. In one particular application, the screw compressor described above is a twin screw compressor.

In normal operation of the screw compressor, the axial force is directed from the discharge end to the intake end, and in order to balance a portion of the axial force, it is necessary to provide an axial force directed from the intake end to the discharge end through the balance disc structure, thereby balancing a portion of the axial force. The axial force required to be balanced is in a positive relationship with the discharge pressure of the screw compressor. The pressure guiding pipeline 5 is used for guiding air from the exhaust pipeline of the screw compressor to the pneumatic cylinder 4, and the pneumatic cylinder 4 is of a closed structure. The elastic diaphragm 42 applies a balance force to the balance disc 3, the balance force rises with the rise of the discharge pressure, and the magnitude of the balance force determines the factors: the exhaust pressure, the contact area of the elastic membrane 42 with the balance disc 3 (which can be controlled by the mounting distance d between the two). Once the machine is stopped, the discharging speed and the balance force of the discharging pressure are reduced at the same time, so that the machine set is ensured not to be subjected to back pressure under the condition of no pressure.

The balance disc structure of the embodiment cancels the oil pressure control system in the traditional balance disc structure, directly balances the axial force by the exhaust pressure of the screw compressor by means of the elastic diaphragm, simplifies the structure and reduces the realization cost. Meanwhile, in the embodiment, the gas exhausted by the screw compressor is introduced into the closed pneumatic cylinder, so that the risk of gas leakage is reduced, the use safety can be ensured when the screw compressor is applied to combustible gas, the application range is widened, and the energy consumption is lower.

Claims

1. A balance disc structure of a screw compressor comprises a shell, a rotor shaft and a balance disc; the rotor shaft is rotatably arranged on the shell, the balance disc is fixed on the rotor shaft, and a high-pressure cavity and a low-pressure cavity are respectively formed on two sides of the balance disc; the balance disc structure is characterized by comprising a pneumatic cylinder, wherein the pneumatic cylinder is arranged in the high-pressure cavity;

the pneumatic cylinder comprises a cylinder body and an elastic diaphragm; the cylinder body is provided with an inner cavity with one end open, and the inner cavity is communicated with an exhaust port of the screw compressor through a pressure guide pipeline; the elastic diaphragm covers the opening of the inner cavity and is connected with the cylinder body, and the elastic diaphragm abuts against the end face of the balance disc, which faces one end of the high-pressure cavity.

2. The balance disc structure of a screw compressor according to claim 1, wherein the elastic diaphragm is detachably connected to the cylinder.

3. The balance disc structure of a screw compressor according to claim 1, wherein the elastic membrane has a thickness of 0.3mm to 5mm.

4. The balance disc structure of a screw compressor of claim 1, wherein the screw compressor is a twin screw compressor.

5. The balance disc structure of a screw compressor according to claim 1 or 4, wherein the rotor shaft is a male rotor shaft or a female rotor shaft.