WO2020077788A1

WO2020077788A1 - Gas supply system of gas bearing for compressor, operation method and refrigeration system

Info

Publication number: WO2020077788A1
Application number: PCT/CN2018/121191
Authority: WO
Inventors: 刘华; 张治平; 李宏波; 陈玉辉; 叶文腾; 亓静利
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-10-18
Filing date: 2018-12-14
Publication date: 2020-04-23
Also published as: CN111076453A

Abstract

A gas supply system of a gas bearing (11) for a compressor, an operation method and a refrigeration system. The gas supply system of the gas bearing (11) for a compressor comprises: a refrigeration cycle pipeline, comprising a first compressor (1), the gas bearing (11) being provided in the first compressor (1); and a second compressor (41), used for pressurizing part of gaseous refrigerants in the refrigeration cycle pipeline to provide same to the gas bearing (11). In a case where the gas pressure in the refrigeration cycle pipeline does not reach the gas pressure required by the gas bearing (11), a part of the gaseous refrigerants in the refrigeration cycle pipeline are pressurized by means of the second compressor (41) so as to achieve the gas pressure required by the gas bearing (11) to work, thus being able to provide continuous and pressure-stable gas for the gas bearing (11), which helps to ensure the continuous and stable operation of the gas bearing (11).

Description

Gas supply system, operation method and refrigeration system of gas bearing for compressor

This application is based on the CN application number 201811213211.8 and the application date is October 18, 2018. Basis, and claim its priority, the disclosure content of the CN application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the field of refrigeration systems, and in particular to an air supply system, operation method, and refrigeration system of a gas bearing for a compressor.

Background technique

Centrifugal refrigeration compressors are usually used in various commercial buildings. At present, centrifugal refrigeration compressors mainly use oil-lubricated bearings and electromagnetic bearings. Lubricating bearings with oil requires an additional lubricant supply system, which increases the complexity of the system; in addition, lubricant will enter the refrigerant system during the operation of the compressor, and a lubricating oil return system is required; in order to prevent impurities contained in the lubricant Lubricating oil filtration system is also needed to enter the bearing; in addition, lubricating oil needs regular maintenance and replacement, which makes the lubricating oil system complicated and difficult to maintain. Centrifugal compressors with electromagnetic bearings have complicated bearing control and poor impact resistance of the system. In addition, additional abnormal power-off protection measures are required.

In recent years, porous gas bearings have also been used in centrifugal compressors. Gas bearings use gas force to support the rotating shaft. Compared with compressors using oil-lubricated bearings, compressors using gas bearings do not require oil system and lubricant maintenance; compared with compressors using electromagnetic bearings, they do not require complicated control systems and abnormal power-off protection systems.

Since the gas bearing needs external air supply during operation, the pressure difference between the suction and exhaust parts of the compressor after the unit is started can be used to supply gas to the gas bearing, but before the unit is started, there is no pressure difference to supply gas to the gas bearing.

Summary of the invention

One of the objectives of the present disclosure is to propose an air supply system, an operation method, and a refrigeration system for a gas bearing for a compressor, which are at least used to alleviate the problem of not supplying the gas bearing with a sufficient pressure difference.

According to an aspect of some embodiments of the present disclosure, a gas supply system of a gas bearing for a compressor includes: a refrigeration cycle line, the refrigeration cycle line includes a first compressor, and the gas bearing is provided at the first compression Inside the machine; and a second compressor for pressurizing and supplying part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing.

In some embodiments, the second compressor is configured to pressurize and supply a part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing before the first compressor is started.

In some embodiments, the second compressor is configured to pressurize and supply part of the gaseous refrigerant in the refrigeration cycle line to the gas under the first compressor's just started state or unsteady working state Bearing.

In some embodiments, the refrigeration cycle includes a condenser; the second compressor is used to pressurize a portion of the gaseous refrigerant in the condenser to the gas bearing.

In some embodiments, the gas supply system of the gas bearing for the compressor includes: a first pipe whose first end is in gas communication with the refrigeration cycle pipe and whose second end is in gas communication with the gas bearing; A first regulating valve is provided on the first pipeline, and the first regulating valve is used to control at least one of on-off and flow of the first pipeline; and a second pipeline, the first end of which is connected to the refrigeration The gas circulation of the circulation pipeline is connected with the second end of the gas bearing, and the second compressor is arranged in the second pipeline.

In some embodiments, the gas supply system of the gas bearing for the compressor includes a gas storage tank, and at least one of the second end of the second pipeline and the second end of the first pipeline passes through the gas storage tank Gaseous communication with the gas bearing.

In some embodiments, the gas storage tank is provided with at least one of a pressure sensor and a temperature sensor.

In some embodiments, the gas supply system of the gas bearing for the compressor includes a third pipeline, a first end of the third pipeline communicates with the gas storage tank, and a second end of the third pipeline communicates with The refrigeration cycle pipeline is connected to guide the liquid refrigerant in the gas storage tank to the refrigeration cycle pipeline; the third pipeline is provided with a second regulating valve for controlling the third pipeline At least one of on and off and flow.

In some embodiments, the first end of the third pipeline communicates with the gas storage tank via the bottom of the gas storage tank.

In some embodiments, the first end of the third pipe is higher than the second end of the third pipe.

In some embodiments, the first pipeline is provided with a first check valve.

In some embodiments, the second pipeline is provided with a second check valve.

In some embodiments, the gas supply system of the gas bearing for the compressor includes a fourth pipeline, and the second end of the first pipeline and the second end of the second pipeline both pass through the fourth pipeline In gas communication with the gas bearing, a third regulating valve is provided on the fourth pipeline, and the third regulating valve is used to control at least one of on-off and flow of the fourth pipeline.

In some embodiments, the first compressor includes a centrifugal compressor.

In some embodiments, the second compressor includes a scroll compressor, a rotor compressor, or a piston compressor.

In some embodiments, the volumetric flow of the first compressor is greater than the volumetric flow of the second compressor.

In some embodiments, the condenser includes a flooded condenser.

Some embodiments of the present disclosure provide an operation method of a gas supply system for a gas bearing of a compressor: before the first compressor is operated, or the first compressor is just started, or the first compressor is in an unstable working state, by The second compressor pressurizes part of the gaseous refrigerant in the refrigeration cycle pipe and sends it to the gas bearing.

In some embodiments, before the first compressor is operated, part of the gaseous refrigerant in the refrigeration cycle is pressurized and delivered to the gas bearing through the second compressor; when the pressure of the gaseous refrigerant after pressurization reaches the pressure required by the gas bearing When the first compressor is running, when the pressure of the gaseous refrigerant in the refrigeration cycle rises to the pressure required by the gas bearing, the second compressor is turned off and the high pressure in the refrigeration cycle is used. The gaseous refrigerant supplies gas to the gas bearing.

In some embodiments, a second pipeline, an air storage tank, and a third pipeline are provided; the first end of the third pipeline communicates with the air storage tank, and the second end of the third pipeline communicates with the refrigeration cycle pipeline; The first end of the second line is in gas communication with the refrigeration cycle line; the second end of the second line is in gas communication with the gas bearing through the gas storage tank; before the first compressor is operated, the liquid refrigerant of the gas storage tank is passed through the The three pipelines are discharged into the refrigeration cycle pipeline; the gas refrigerant in the refrigeration cycle pipeline is pressurized by the second compressor and then sent to the gas storage tank through the second pipeline, and the gas refrigerant in the gas storage tank is supplied to the gas bearing; When the pressure of the gaseous refrigerant in the gas storage tank reaches the pressure required by the gas bearing, the first compressor is turned on.

Some embodiments of the present disclosure provide a refrigeration system including the above-mentioned gas supply system for a gas bearing of a compressor

An air supply system for a gas bearing for a compressor according to an embodiment of the present disclosure includes a refrigeration cycle line and a second compressor. The refrigeration cycle line includes a first compressor, and the gas bearing is provided in the first compressor. The second compressor is used to pressurize part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing; when the gas pressure in the refrigeration cycle line does not reach the gas pressure required by the gas bearing, the refrigeration cycle is performed by the second compressor Part of the gaseous refrigerant in the pipeline is pressurized to meet the gas pressure required by the gas bearing, which is used to provide continuous and stable gas for the gas bearing, which is conducive to ensuring the continuous and stable operation of the gas bearing.

BRIEF DESCRIPTION

1 is a schematic diagram illustrating a gas supply system of a gas bearing for a compressor according to some embodiments of the present disclosure;

2 is a schematic diagram illustrating a first compressor according to some embodiments of the present disclosure.

Explanation of symbols in the drawings:

1-first compressor; 11-bearing; 111-axial bearing; 112-composite bearing; 12-chassis; 121-intake hole; 13-motor rotor; 14-motor stator; 15-first-stage impeller; 16 -Two-stage impeller; 17-thrust disk; 18-first-stage diffuser; 19-stage volute; 110-bearing housing;

2-Condenser;

3- the first pipeline; 31- the first regulating valve; 32- the first check valve;

4- Second pipeline; 41- Second compressor; 43- Second check valve;

5- gas storage tank;

6- third pipeline; 61- second regulating valve;

7- fourth pipeline; 71- third regulating valve.

detailed description

The technical solutions in the embodiments will be described clearly and completely in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be understood that the terms "center", "portrait", "landscape", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present disclosure and simplifying the description, not to indicate or imply The device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of protection of the present disclosure.

As shown in FIG. 1, a gas supply system for a gas bearing for a compressor provided in some embodiments includes a refrigeration cycle line. The refrigeration cycle line includes a first compressor 1, and the gas bearing 11 described above is provided at the first compression Inside machine 1. The gaseous refrigerant in the refrigeration cycle can be supplied to the gas bearing 11 to meet the working conditions of the gas bearing 11.

After the gas pressure required by the gas bearing is satisfied, the rotor of the compressor can leave the gas bearing and become suspended. The compressor motor rotates. The gas supply pressure of the gas bearing is sufficient to be a prerequisite for the normal operation of the compressor.

In some embodiments, the gas supply system of the gas bearing for the compressor includes a second compressor 41, and the second compressor 41 is used to pressurize a part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing 11.

When the gas pressure in the refrigeration cycle line does not reach the gas pressure required by the gas bearing 11, a part of the gaseous refrigerant in the refrigeration cycle line is pressurized by the second compressor 41 to meet the requirements of the gas bearing 11 Gas pressure to solve the problem that there is not enough pressure difference in the unit to supply gas to the gas bearing 11.

The second compressor 41 pressurizes part of the gaseous refrigerant in the refrigeration cycle line, which can provide the gas bearing 11 with continuous and stable pressure gas, which is conducive to ensuring continuous and stable operation of the gas bearing 11; and the gaseous state supplied to the gas bearing 11 The refrigerant is relatively pure and is not easy to be doped with liquid refrigerant, which helps to ensure the working reliability of the gas bearing 11.

A part of the gaseous refrigerant in the refrigeration cycle is pressurized and supplied to the gas bearing 11 by the second compressor 41. This process has no liquid medium, and there is no need to provide a throttle device, a gas-liquid separation device, etc. The structure is simple and the operation is convenient.

In some embodiments, the second compressor 41 is configured to pressurize a part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing 11 before the first compressor 1 is started.

Before the first compressor 1 is started, the pressure of the gaseous refrigerant in the refrigeration cycle is low, and the working pressure required by the gas bearing 11 cannot be reached. The second compressor 41 supplies part of the gaseous refrigerant in the refrigeration cycle through pressurization. The gas bearing 11 can solve the problem that there is not enough pressure difference in the unit to supply gas to the gas bearing 11 before the unit is started.

In some embodiments, the second compressor 41 is configured to pressurize a portion of the gaseous refrigerant in the first refrigeration cycle line to the gas bearing 11 immediately after the first compressor 1 is started.

When the first compressor 1 is just started, the pressure of the gaseous refrigerant in the refrigeration cycle gradually increases, but it has not yet reached the working pressure required by the gas bearing 11, and the second compressor 41 places the refrigerant in the refrigeration cycle Part of the gaseous refrigerant is supplied to the gas bearing 11 under pressure, which can solve the problem that there is not enough pressure difference in the unit to supply gas to the gas bearing 11.

In some embodiments, the second compressor 41 is configured to pressurize a part of the gaseous refrigerant in the refrigeration cycle line to the gas bearing 11 under the unsteady operation state of the first compressor 1.

When the first compressor 1 is in an unstable working state, the pressure of the gaseous refrigerant in the refrigeration cycle may be unstable, and there may be cases where the working pressure required by the gas bearing 11 cannot be met. The second compressor 41 will Part of the gaseous refrigerant in the refrigeration cycle is supplied to the gas bearing 11 under pressure, and the gas bearing 11 can be supplied with a continuous and stable gas.

In some embodiments, the refrigeration cycle includes a condenser 2; the second compressor 41 is used to pressurize a portion of the gaseous refrigerant in the condenser 2 to the gas bearing 11.

Of course, the second compressor 41 is not limited to pressurizing and supplying the gaseous refrigerant in the condenser 2 to the gas bearing 11. The gaseous refrigerant contained in the evaporator, throttling device, and piping in the refrigeration cycle pipeline can be pressurized and supplied to the gas bearing 11 by the second compressor 41.

In some embodiments, the second compressor 41 may also pressurize a part of the gaseous refrigerant in the pipeline between the first compressor 1 and the condenser 2 to the gas bearing 11.

In some embodiments, the second compressor 41 may also pressurize a part of the gaseous refrigerant in the evaporator in the refrigeration cycle to the gas bearing 11.

In some embodiments, the gas supply system of the gas bearing for the compressor includes a first pipe 3, the first end of the first pipe 3 is in gas communication with the refrigeration cycle pipe, and the second end of the first pipe 3 is in gas The bearing 11 is in gas communication; a first regulating valve 31 is provided on the first pipeline 3, and the first regulating valve 31 is used to control at least one of the on-off of the first pipeline 3 and the flow rate.

The first pipeline 3 can directly supply a part of the gaseous refrigerant in the refrigeration cycle pipeline to the gas bearing 11. The first regulating valve 31 is used to control the flow rate of the first pipeline 3 so that the gas pressure in the first pipeline 3 meets the pressure required by the gas bearing 11.

In some embodiments, the gas supply system of the gas bearing for the compressor further includes a second pipeline 4, the first end of the second pipeline 4 is in gas communication with the refrigeration cycle pipeline, and the second end of the second pipeline 4 is The gas bearing 11 is in gas communication; the second compressor 41 is provided in the second pipeline 4.

In some embodiments, the first pipeline 3 and the second pipeline 4 are connected in parallel. When the pressure of the gaseous refrigerant in the refrigeration cycle pipeline meets the gas pressure required by the gas bearing 11, the first pipeline 3 can be The gas bearing 11 supplies gas. In the case where the pressure of the gaseous refrigerant in the refrigeration cycle line cannot meet the gas pressure required by the gas bearing 11, a part of the gaseous refrigerant in the refrigeration cycle line can be pressurized and supplied through the second compressor 41 on the second line 4 Gas bearing 11.

In some embodiments, the gas supply system of the gas bearing for the compressor further includes a gas storage tank 5, and the second end of the second pipeline 4 is in gas communication with the gas bearing 11 through the gas storage tank 5. The second pipeline 4 leads part of the gaseous refrigerant in the refrigeration cycle pipeline, and after being pressurized by the second compressor 41, it leads to the gas storage tank 5. The gaseous refrigerant in the gas storage tank 5 is supplied to the gas bearing 11, which is beneficial to The gas bearing 11 is supplied with a gas having a stable pressure.

In some embodiments, the gas supply system of the gas bearing for the compressor further includes a gas storage tank 5, and the second end of the first pipeline 3 is in gas communication with the gas bearing 11 through the gas storage tank 5. The first pipeline 3 leads part of the gaseous refrigerant in the refrigeration cycle pipeline to the gas storage tank 5, and the gaseous refrigerant in the gas storage tank 5 is supplied to the gas bearing 11. The gas pressure in the gas storage tank 5 is easy to detect, so as to facilitate the adjustment of the gas pressure in the gas storage tank 5 according to the actual situation, so as to provide the gas bearing 11 with stable pressure gas.

In some embodiments, the gas storage tank 5 is provided with a pressure sensor, and the pressure sensor is used to detect the gas pressure in the gas storage tank 5. When the gas pressure in the gas storage tank 5 does not reach the pressure required by the gas bearing 11, the gas can be pressurized by the second compressor 41 so that the gas pressure in the gas storage tank 5 meets the pressure required by the gas bearing 11.

In some embodiments, the gas storage tank 5 is provided with a temperature sensor, and the temperature sensor is used to detect the temperature of the gas in the gas storage tank 5.

In some embodiments, the gas supply system of the gas bearing for the compressor further includes a third pipeline 6, the first end of the third pipeline 6 communicates with the gas storage tank 5, and the second end of the third pipeline 6 communicates with refrigeration The circulation pipeline is connected to guide the liquid refrigerant in the gas storage tank 5 to the refrigeration circulation pipeline for refrigerant recovery. The third pipeline 6 is provided with a second regulating valve 61, and the second regulating valve 61 is used to control at least one of the on-off of the third pipeline 6 and the flow rate.

The gas storage tank 5 is used to receive a part of the gaseous refrigerant in the refrigeration cycle line introduced by at least one of the first line 3 and the second line 4. The gaseous refrigerant in the gas storage tank 5 may be liquefied. The liquid refrigerant in the gas storage tank 5 can be led back to the refrigeration circulation pipe through the third pipe 6 to recover the refrigerant.

In some embodiments, the first end of the third pipeline 6 communicates with the gas storage tank 5 via the bottom of the gas storage tank 5, which facilitates the use of gravity to guide the liquid refrigerant in the gas storage tank 5 back into the refrigeration cycle line.

In some embodiments, the first end of the third pipeline 6 is higher than the second end of the third pipeline 6, which facilitates the use of gravity to guide the liquid refrigerant in the gas storage tank 5 back into the refrigeration cycle pipeline.

In some embodiments, the first pipeline 3 is provided with a first one-way valve 32, which facilitates the flow of the gaseous refrigerant in the refrigeration cycle to the gas bearing 11, and prevents the gaseous refrigerant at the gas bearing 11 from flowing to the refrigeration cycle.

In some embodiments, the second pipeline 4 is provided with a second one-way valve 42, which facilitates the flow of the gaseous refrigerant in the refrigeration cycle to the gas bearing 11 and prevents the gaseous refrigerant at the gas bearing 11 from flowing to the refrigeration cycle.

In some embodiments, the gas supply system of the gas bearing for the compressor further includes a fourth pipeline 7, and the second end of the first pipeline 3 and the second end of the second pipeline 4 both pass through the fourth pipeline 7 and The gas bearing 11 is in gas communication, and a third regulating valve 71 is provided on the fourth pipeline 7. The third regulating valve 71 is used to control at least one of the on-off of the fourth pipeline 7 and the flow rate.

In the case where at least one of the first line 3 and the second line 4 has a gas pressure that reaches the pressure required by the gas bearing 11, the third regulating valve 71 is opened, and the gas bearing is passed through the fourth line 7 11 Gas supply. And the gas flow rate in the fourth pipeline 7 is controlled by the third regulating valve 71 so that the pressure supplied to the gas bearing 11 through the fourth pipeline 7 always meets the requirements.

In some embodiments, the first compressor 1 includes a centrifugal compressor.

In some embodiments, the second compressor 41 includes a compressor with a small volume flow such as a scroll compressor, a rotor compressor, or a piston compressor.

In some embodiments, the volumetric flow of the first compressor 1 is greater than the volumetric flow of the second compressor 41.

In some embodiments, the condenser 2 includes a flooded condenser. The gas refrigerant of the first compressor 1 leads to the condenser 2, the upper layer of the condenser 2 is gas refrigerant, and the lower layer of the condenser 2 is liquid refrigerant.

Some embodiments provide an operation method of the above gas supply system for a gas bearing of a compressor, which is performed before the first compressor 1 is operated, or immediately after the first compressor 1 is started, or in the first compressor 1 In the non-steady operation state, part of the gaseous refrigerant in the refrigeration cycle is pressurized by the second compressor 41 and then sent to the gas bearing 11.

In some embodiments, before the first compressor 1 is operated, part of the gaseous refrigerant in the refrigeration cycle is pressurized and sent to the gas bearing 11 through the second compressor 41; when the pressure of the gaseous refrigerant after the pressurization reaches the gas bearing 11 At the required pressure, the first compressor 1 is turned on.

After the operation of the first compressor 1, when the pressure of the gaseous refrigerant in the refrigeration cycle rises to the pressure required by the gas bearing 11, the second compressor 41 is turned off, and the high-pressure gaseous refrigerant in the refrigeration cycle is used to feed the gas bearing 11 Gas supply.

In some embodiments, the gas supply system of the gas bearing for the compressor is provided with a second pipeline 4, an air storage tank 5 and a third pipeline 6; the first end of the third pipeline 6 communicates with the air storage tank 5, The second end of the third pipeline 6 is in communication with the refrigeration cycle pipeline; the second pipeline 4 is in gas communication with the gas bearing 11 through the gas storage tank 5.

Before the first compressor 1 is operated, the liquid refrigerant of the gas storage tank 5 is discharged into the refrigeration cycle pipe through the third pipe 6.

Part of the gaseous refrigerant in the refrigeration cycle line is pressurized by the second compressor 41 and then sent to the gas storage tank 5 through the second line 4, and the gaseous refrigerant in the gas storage tank 5 is supplied to the gas bearing 11.

When the pressure of the gaseous refrigerant in the gas storage tank 5 reaches the pressure required by the gas bearing 11, the first compressor 1 is turned on.

The operation methods of some specific embodiments of the gas supply system of the gas bearing for the compressor are listed below:

In some specific embodiments, the discharge end of the first compressor 11 communicates with the condenser 2, the upper layer of the condenser 2 is a gas refrigerant, and the lower layer of the condenser 2 is a liquid refrigerant.

The upper layer of the condenser 2 communicates with the gas storage tank 5 through the first pipe 3. The first pipeline 3 is provided with a first regulating valve 31.

The upper layer of the condenser 2 also communicates with the gas storage tank 5 through a second pipe 4 parallel to the first pipe 3. The second pipeline 4 is provided with a second compressor 41.

The bottom of the gas storage tank 5 communicates with the lower layer of the condenser 2 through the third pipe 6. The third pipeline 6 is provided with a second regulating valve 61.

The top of the gas storage tank 5 is in gas communication with the gas bearing 11 through the fourth pipe 7. The fourth pipeline 7 is provided with a third regulating valve 71.

Before the first compressor 1 is operated, the gas refrigerant at the top of the condenser 2 has the same pressure as the gas refrigerant in the gas storage tank 5, the second regulating valve 61 is opened, and the liquid refrigerant in the gas storage tank 5 is discharged to the condenser by gravity 2; after a period of time, the second compressor 41 is turned on, and the second compressor 41 compresses part of the gaseous refrigerant at the top of the condenser 2 into the gas storage tank 5, and the pressure of the gas storage tank 5 rises. After the liquid refrigerant in the tank 5 is emptied, the second regulating valve 61 is closed.

When the pressure of the gas storage tank 5 rises to the pressure required by the gas bearing 11, the third regulating valve 71 is opened to ensure that the gas supply of the gas bearing 11 meets the requirements.

The first compressor 1 is started, and at this time, the second compressor 41 continuously compresses the gaseous refrigerant in the condenser 2 to the gas storage tank 5, and the gas storage tank 5 supplies the gas bearing 11 gas.

After the first compressor 1 operates stably, the pressure in the condenser 2 gradually increases. When the pressure of the condenser 2 rises to meet the gas pressure required by the gas bearing 11, the first regulating valve 31 is opened and the first二 compressor 41.

At this time, the gas bearing 11 uses the high-pressure gaseous refrigerant in the condenser 2 to supply gas and work, and the pressure in the gas storage tank 5 is controlled within a reasonable range by adjusting the first regulating valve 31 to ensure the stability of the gas bearing 11 gas supply.

Some embodiments provide a refrigeration system that includes the gas supply system of the gas bearing for a compressor described above.

The refrigeration cycle includes a first compressor 1, a condenser 2, and an evaporator and throttle device.

The circulation process of the refrigeration circulation pipeline is: first compressor 1-condenser 2-throttling device-evaporator-first compressor 1.

As shown in FIG. 2, some specific embodiments of the first compressor 1 are listed below:

The first compressor 1 includes a gas bearing 11, a casing 12, a motor rotor 13, a motor stator 14, a first-stage impeller 15, a second-stage impeller 16, a thrust disk 17, a first-stage diffuser 18, a first-stage volute 19, etc. .

The motor rotor 13 and the motor stator 14 are provided in the casing 12. The inner diameter of the inside of the casing 12 matched with the motor stator 14 is provided with a spiral groove structure. When the first compressor 1 is in operation, the throttling refrigerant is passed into the spiral groove. When the refrigerant flows in the spiral groove, the heat on the surface of the motor can be evaporated, thereby cooling the motor and reducing the temperature when the motor is working.

The first-stage impeller 15 and the second-stage impeller 16 are arranged at both ends of the motor rotor 13 in back-to-back direction. With this structural arrangement, the axial force of the motor rotor 13 can be reduced.

The thrust disk 17 is arranged downstream of the first-stage impeller 15 in the airflow direction.

The gas bearing 11 includes an axial bearing 111 and a composite bearing 112. The axial bearing 111 and the compound bearing 112 are arranged on both sides of the thrust plate 17.

The axial bearing 111 is axially positioned by a positioning ring to ensure the clearance between the axial bearing 111 and the thrust plate 17.

The composite bearing 112 is an axial and radial composite bearing. The composite bearing 112 can bear both axial loads and radial loads.

The primary diffuser 18 serves as a diffuser flow path, and the inner ring contains a comb-tooth structure as a seal to prevent the high-pressure gaseous refrigerant flowing out of the primary impeller 15 from leaking into the motor cavity.

The first-stage volute 19 includes a volute structure for collecting the compressed gaseous refrigerant of the first-stage impeller 14 and flowing to the inlet of the second-stage impeller 16.

The casing 12, the first-stage diffuser 18 and the bearing base 110 are respectively provided with air passages for supplying gaseous refrigerant to the gas bearing 11, and the air inlet 121 communicating with the gas supply system is provided in the casing 12, and the gas supply system provides Of the gaseous refrigerant flows into the gas bearing 11 through the air holes provided in the inlet hole 121 and the casing 12, the first-stage diffuser 18 and the bearing seat 110, and forms a gas film to support the motor rotor 13 to complete the bearing working process .

Before the first compressor 1 starts to work, it is necessary to supply gas to the gas bearing 11, and the gas supply can be stopped only after the first compressor 1 has completely stopped rotating.

In the description of this disclosure, it should be understood that the use of "first", "second", "third" and other words to define components is only for the purpose of distinguishing the above-mentioned components, unless otherwise stated, The above words have no special meaning, and therefore cannot be understood as limiting the protection scope of the present disclosure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit it; although the present disclosure has been described in detail with reference to the preferred embodiments, persons of ordinary skill in the art should understand that: The disclosed specific embodiments are modified or equivalently replaced with some technical features; without departing from the spirit of the technical solutions of the present disclosure, they should be covered by the technical solutions claimed by the present disclosure.

Claims

An air supply system for a gas bearing of a compressor, including:

A refrigeration cycle pipeline, which includes a first compressor (1), and the gas bearing (11) is provided in the first compressor (1); and

The second compressor (41) is used to pressurize and supply part of the gaseous refrigerant in the refrigeration cycle to the gas bearing (11).
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the second compressor (41) is configured to connect the refrigeration cycle line before the first compressor (1) is started Part of the gaseous refrigerant in is supplied to the gas bearing (11) under pressure.
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the second compressor (41) is configured to be in a state where the first compressor (1) has just started or an unsteady working state , Pressurizing and supplying part of the gaseous refrigerant in the refrigeration cycle to the gas bearing (11).
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the refrigeration cycle line includes a condenser (2); the second compressor (41) is used to connect the condenser (2) ) Part of the gaseous refrigerant is supplied to the gas bearing (11) under pressure.
The gas supply system of a gas bearing for a compressor according to claim 1, comprising:

The first pipe (3) has a first end in gas communication with the refrigeration cycle pipe and a second end in gas communication with the gas bearing (11); the first pipe (3) is provided with a A regulating valve (31), the first regulating valve (31) is used to control at least one of the on-off and flow rate of the first pipeline (3); and

The second line (4) has a first end in gas communication with the refrigeration cycle line and a second end in gas communication with the gas bearing (11); the second compressor (41) is provided on the The second pipeline (4).
The gas supply system of a gas bearing for a compressor according to claim 5, comprising an air storage tank (5), a second end of the second pipeline (4) and the first pipeline (3) At least one of the second ends of the gas is in gas communication with the gas bearing (11) through the gas storage tank (5).
The gas supply system of a gas bearing for a compressor according to claim 6, wherein the gas storage tank (5) is provided with at least one of a pressure sensor and / or a temperature sensor.
The gas supply system of a gas bearing for a compressor according to claim 6, wherein it includes a third pipeline (6), the first end of the third pipeline (6) and the gas storage tank (5) Communication, the second end of the third pipeline (6) communicates with the refrigeration cycle pipeline for guiding the liquid refrigerant in the gas storage tank (5) to the refrigeration cycle pipeline; the first The third pipeline (6) is provided with a second regulating valve (61) for controlling at least one of the on-off and flow of the third pipeline (6).
The gas supply system of a gas bearing for a compressor according to claim 8, wherein the first end of the third pipeline (6) passes through the bottom of the gas storage tank (5) and the gas storage tank ( 5) Connectivity.
The air supply system of a gas bearing for a compressor according to claim 8, wherein the first end of the third line (6) is higher than the second end of the third line (6).
The gas supply system of a gas bearing for a compressor according to claim 5, wherein the first line (3) is provided with a first check valve (32), and / or, the second line ( 4) A second check valve (42) is provided.
The gas supply system of a gas bearing for a compressor according to claim 5, comprising a fourth pipeline (7), a second end of the first pipeline (3) and the second pipeline (4 ) Both of the second ends are in gas communication with the gas bearing (11) through the fourth pipeline (7), and a third regulating valve (71) is provided on the fourth pipeline (7), the first The three regulating valve (71) is used to control at least one of the on-off and flow of the fourth pipeline (7).
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the first compressor (1) includes a centrifugal compressor.
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the second compressor (41) includes a scroll compressor, a rotor compressor, or a piston compressor.
The gas supply system of a gas bearing for a compressor according to claim 1, wherein the volumetric flow rate of the first compressor (1) is greater than the volumetric flow rate of the second compressor (41).
The gas supply system of a gas bearing for a compressor according to claim 4, wherein the condenser (2) includes a flooded condenser.
An operation method of a gas supply system for a gas bearing of a compressor according to claim 1, wherein before the first compressor (1) is operated, or immediately after the first compressor (1) is started, or the first compression In the unsteady working state of the machine (1), part of the gaseous refrigerant in the refrigeration cycle pipe is pressurized by the second compressor (41) and then sent to the gas bearing (11).
The method for operating a gas supply system of a gas bearing for a compressor according to claim 17, wherein:

Before the first compressor (1) is operated, part of the gas refrigerant in the refrigeration cycle is pressurized and sent to the gas bearing (11) through the second compressor (41); when the pressure of the gas refrigerant after pressurization reaches the gas bearing (11) When the required pressure, turn on the first compressor (1);

After the first compressor (1) is operated, when the pressure of the gaseous refrigerant in the refrigeration cycle rises to the pressure required by the gas bearing (11), the second compressor (41) is turned off, and the The high-pressure gaseous refrigerant supplies gas to the gas bearing (11).
The method for operating a gas supply system of a gas bearing for a compressor according to claim 18, wherein a second pipeline (4), an air storage tank (5) and a third pipeline (6) are provided; the third pipeline The first end of (6) communicates with the gas storage tank (5), the second end of the third pipeline (6) communicates with the refrigeration cycle pipeline; the first end of the second pipeline (4) communicates with the refrigeration cycle pipeline Communication; the second end of the second pipeline (4) is in gas communication with the gas bearing (11) through the gas storage tank (5);

Before the first compressor (1) is operated, the liquid refrigerant of the gas storage tank (5) is discharged into the refrigeration cycle pipe through the third pipe (6);

The second compressor (41) pressurizes part of the gaseous refrigerant in the refrigeration cycle line and sends it to the gas storage tank (5) through the second line (4). The gaseous refrigerant in the gas storage tank (5) supplies gas Bearing (11);

When the pressure of the gaseous refrigerant in the gas storage tank (5) reaches the pressure required by the gas bearing (11), the first compressor (1) is turned on.
A refrigeration system, comprising the gas supply system of the gas bearing for a compressor according to any one of claims 1 to 16.