Water vapor compression system and bearing air supply method

Abstract

The invention discloses a water vapor compression system and a bearing gas supply method, the water vapor compression system comprises: a water vapor compressor comprising a gas bearing, a gas supply port and a gas exhaust port for respectively supplying gas to and exhausting gas from the gas bearing, a water vapor inlet for inputting water vapor to be compressed, and a water vapor outlet for outputting compressed water vapor; a first tank for storing compressed gas for the gas bearing, the first tank including a first port and a second port connected to the gas supply port and the gas discharge port, respectively; the steam driving air pump comprises a first driving end used for providing driving force and a first air pumping end used for pumping air and discharging air, the first driving end comprises a steam inlet connected with the steam outlet, and the first air pumping end is arranged on a connecting pipeline between the first opening and the air supply opening; the first air pumping end comprises a first air extraction opening connected with the first opening and a first air outlet connected with the air supply opening.

Description

Technical Field

[0001] The present invention relates to the technical field of water vapor compression, and in particular to a water vapor compression system and a bearing air supply method. Background Art

[0002] Water vapor compression is widely used in heat recovery, heat pump systems, power generation and other fields. After water vapor is compressed, it is converted into high-temperature and high-pressure water vapor and output for use in subsequent links. Many water vapor compressors used in water vapor compression use gas bearings to support the rotor. Water vapor compressors using gas bearings need to supply air to the bearings during operation. The air supply for the bearings of current water vapor compressors is supplied by the air compressor after compressing the external ordinary air. The air coming out of the air compressor exhaust port flows through radial and axial air intake pipes to the water vapor compressor bearings to support the compressor bearings. Since the bearings need to be continuously supplied with air, the air compressor must be kept on, which greatly increases the operating load of the unit. Summary of the Invention

[0003] The object of the present invention is to provide a water vapor compression system which helps to reduce the operating load of a unit.

[0004] A first aspect of the present invention discloses a water vapor compression system comprising:

[0005] A water vapor compressor comprising a gas bearing, a gas supply port and a gas exhaust port for supplying gas to and exhausting gas from the gas bearing, respectively, a water vapor inlet for inputting water vapor to be compressed, and a water vapor outlet for outputting the compressed water vapor;

[0006] a first tank for storing compressed gas for the gas bearing, comprising a first port and a second port connected to the gas supply port and the gas exhaust port, respectively;

[0007] A steam-driven air pump includes a first driving end for providing driving force and a first pumping end for extracting and discharging air, wherein the first driving end includes a steam inlet connected to the water vapor outlet, and the first pumping end is arranged on a connecting pipeline between the first port and the air supply port, and the first pumping end includes a first air extraction port connected to the first port and a first air outlet connected to the air supply port.

[0008] The water vapor compression system of this embodiment, for a water vapor compressor using gas bearings, provides a first tank connected to the air supply port and the exhaust port of the gas bearing and adopts a steam-driven air pump. After the water vapor compressor is working, the water vapor compressed by the water vapor compressor is used to drive the steam-driven air pump to work and to extract air from the first tank to supply air to the gas bearing and to circulate the gas. Therefore, after the water vapor compressor is working, there is no need to use an air compressor to continuously supply air. The water vapor discharged from the water vapor compressor is used as power to circulate and supply air to the bearings, which can reduce the operating load of the unit.

[0009] In some embodiments, the first driving end further includes a steam outlet connected to the water vapor inlet.

[0010] In this embodiment, the first driving end can output water vapor from the steam outlet to the water vapor inlet, and then enter the water vapor compressor for compression again. By returning the water vapor that has entered the first driving end and performed work on the first driving end to the water vapor compressor for compression, the water vapor that has performed work on the steam-driven air pump can be reused, thereby improving the utilization efficiency of the water vapor.

[0011] In some embodiments, further comprising:

[0012] A first control valve is provided on the connecting pipeline between the steam inlet and the water vapor outlet, and is used to control the on-off of the pipeline in which it is located;

[0013] a first pressure sensor, configured to detect the pressure of water vapor on the connecting pipe between the steam inlet and the water vapor outlet;

[0014] The controller is connected to the first control valve and the first pressure sensor signal, and is used to control the first control valve to open and close the pipeline in which it is located according to the detection result of the first pressure sensor.

[0015] In this embodiment, the pressure of the water vapor output from the water vapor outlet is detected by the first pressure sensor. When it is detected that the pressure of the water vapor increases to a pressure that can enable the steam-driven air pump to work effectively, the controller controls the first control valve to open, allowing the water vapor to flow into the steam-driven air pump for driving. This can ensure that the steam-driven air pump works reliably and effectively after it is turned on, thereby ensuring that the turning on of the steam-driven air pump can reliably drive the operation of the air supply cycle of the gas bearing.

[0016] In some embodiments, further comprising:

[0017] A pressure control valve includes a valve body, a valve core, a first valve port provided on the valve body, a second valve port connected to the first valve port and provided on the valve body, a feedback valve port provided on the valve body and connected to the second valve port, and a spring connected to the valve core. The elastic force of the spring causes the valve core to tend to move in a direction that increases the flow area connecting the first valve port and the second valve port. The pressure of the fluid introduced into the feedback valve port causes the valve core to tend to move in a direction that reduces the flow area connecting the first valve port and the second valve port. The first valve port is connected to the first air outlet, and the second valve port is connected to the air supply port.

[0018] In this embodiment, when the water vapor compressor is working, the gas output from the first tank enters the pressure control valve through the first valve port of the pressure control valve, and is then output to the air supply port from the second valve port. Since the valve core is subjected to the pressure of the spring and the feedback valve port at the same time, when the forces on the valve core are balanced, the pressure at the feedback valve port is equal to the elastic force of the spring, and the elastic force of the spring remains stable, thereby maintaining the pressure at the feedback valve port stable. That is, the pressure at the second valve port connected to the feedback valve port, which has the same pressure as the pressure at the feedback valve port, also remains stable. Therefore, the setting of the pressure control valve can keep the air supply pressure to the gas bearing stable, thereby ensuring the stable operation of the bearing and the life of the bearing.

[0019] In some embodiments, further comprising:

[0020] an air compressor, comprising an air compressor inlet and an air compressor outlet for inputting air and outputting compressed air respectively, wherein the air compressor outlet is connected to the first tank;

[0021] A second control valve is provided on the connecting pipeline connecting the air compressor outlet and the first tank, and is used to control the on-off of the pipeline in which it is located;

[0022] a second tank including a third port and a fourth port connected to the air compressor outlet and the air compressor inlet, respectively;

[0023] A pneumatic pump comprising a second driving end for providing a driving force and a second pumping end for extracting and discharging air, wherein the second driving end comprises an air inlet connected to the fourth port and an air outlet connected to the air compressor outlet, the second pumping end is provided on a connecting pipeline between the first tank and the air supply port, and the second pumping end comprises a second air extraction port connected to the first tank and a second air outlet connected to the air supply port;

[0024] The third control valve is provided on the connecting pipeline between the fourth port and the air inlet, and is used to control the on-off of the pipeline in which it is located.

[0025] This embodiment, through the arrangement of structures such as the air compressor, the second tank, the pneumatic pump, the second control valve and the third control valve, can realize the inflation of the first tank and the use of the air compressor to extract gas from the first tank and supply gas to the gas bearing. Therefore, before the water vapor compressor is working stably, the operation of the air compressor can be used to supply gas to the gas bearing, thereby ensuring the safe and stable startup of the water vapor compressor. After the water vapor compressor is working stably, the air supply drive to the gas bearing can be switched to the water vapor and steam-driven air pump of the water vapor compressor by closing the air compressor, thereby reducing the unit load and improving the water vapor utilization efficiency.

[0026] In some embodiments, further comprising:

[0027] a fourth control valve, provided on the connecting pipeline between the air compressor outlet and the third port, for controlling the on-off of the pipeline in which it is located;

[0028] An electrically controlled valve has one end connected to the second tank and the other end connected to the air inlet. When the power is off, the electrically controlled valve opens and controls the pipeline in which it is located to connect the second tank and the air inlet. When the power is on, the electrically controlled valve closes and controls the pipeline in which it is located to disconnect.

[0029] The fourth control valve and the electrically controlled valve in this embodiment provide power-off protection for the water vapor compression system. For example, after the water vapor compressor stabilizes, the second tank can be inflated and the fourth control valve closed to maintain a certain pressure of compressed air in the second tank. If the water vapor compression system loses power due to a fault, the electrically controlled valve opens and conducts, allowing compressed air in the second tank to enter the air inlet through the electrically controlled valve, driving the pneumatic pump for a period of time, maintaining air supply to the gas bearing for a period of time, and thus ensuring a stable stop of the gas bearing.

[0030] In some embodiments, further comprising:

[0031] a second pressure sensor, configured to detect the pressure of the gas in the first tank;

[0032] a third pressure sensor, configured to detect the pressure of the gas in the second tank;

[0033] The controller is connected to the second control valve, the third control valve, the fourth control valve, the second pressure sensor and the third pressure sensor signals, and is used to control the second control valve, the third control valve and the fourth control valve to open and close the pipelines in which they are located according to the detection results of the second pressure sensor and the third pressure sensor.

[0034] The water vapor compression system of this embodiment, with its second and third pressure sensors, can promptly monitor the gas pressures within the first and second tanks, enabling the controller to promptly control the water vapor compression system. For example, before the water vapor compressor is started, the air compressor inflates the first tank. When the second pressure sensor detects that the gas pressure within the first tank is greater than a first set value, indicating that sufficient air has been introduced into the first tank, the second control valve can be promptly closed and the fourth control valve opened to inflate the second tank. When the third pressure sensor detects that the gas pressure within the second tank is greater than a second set value, indicating that the pressure of the air introduced into the second tank is sufficient to effectively drive the pneumatic pump, the third control valve can be promptly opened, and the gas output from the second tank can be used to drive the pneumatic pump, which in turn evacuates air from the first tank and supplies air to the gas bearing. After closing the third control valve to shut down the drive of the pneumatic pump and using the water vapor output by the water vapor compressor to drive the steam-driven air pump to supply air to the gas bearing, when the third pressure sensor detects that the gas pressure in the tank of the second tank is greater than the fourth set value, it means that the air filled in the tank of the second tank can drive the pneumatic pump to work effectively for a period of time after a power failure, thereby ensuring that the gas bearing can stop safely. At this time, the fourth control valve can be controlled to close, so that the compressed air for power failure protection is stored in the second tank.

[0035] In some embodiments, an air treatment device is also included, which includes a drying filter for drying the air and / or an electrostatic dust collection device for removing dust from the air. The air treatment device is arranged on the connecting pipeline between the air compressor outlet and the first tank and is also arranged on the connecting pipeline between the air compressor outlet and the third port.

[0036] This embodiment introduces a drying filter and an electrostatic dust collector to reduce moisture in the air, improve the cleanliness of the air supply, ensure stable operation of the bearing, and guarantee the life of the bearing.

[0037] A second aspect of the present invention discloses a bearing air supply method using any of the above-mentioned water vapor compression systems, comprising:

[0038] After the water vapor compressor starts to work, the partially compressed water vapor outputted from the water vapor outlet is inputted into the first driving end to drive the first pumping end to work;

[0039] The first pumping port is used to extract gas from the first tank and pump gas to the gas bearing through the gas supply port, and the gas output from the exhaust port is input to the first tank through the second port.

[0040] The bearing air supply method of this embodiment uses the water vapor compressed by the water vapor compressor to drive the steam-driven air pump to work and extract air from the first tank to supply air to the gas bearing and circulate the gas after the water vapor compressor works. Therefore, there is no need to use an air compressor to continuously supply air after the water vapor compressor works. The water vapor discharged from the water vapor compressor is used as power to circulate air to the bearing, which can reduce the operating load of the unit.

[0041] In some embodiments, the first driving end further includes a steam outlet connected to the water vapor inlet, and the bearing air supply method further includes: returning the water vapor output from the first driving end to the water vapor inlet to be compressed again by the water vapor compressor.

[0042] In the bearing air supply method of this embodiment, the first driving end can output water vapor from the steam outlet to the water vapor inlet, and then enter the water vapor compressor for compression again. By returning the water vapor that has entered the first driving end and performed work on the first driving end to the water vapor compressor for compression, the water vapor that has performed work on the steam-driven air pump can be reused, thereby improving the utilization efficiency of the water vapor.

[0043] In some embodiments, the water vapor compression system further comprises:

[0044] an air compressor, comprising an air compressor inlet and an air compressor outlet for inputting air and outputting compressed air respectively, wherein the air compressor outlet is connected to the first tank;

[0045] A second control valve is provided on the connecting pipeline connecting the air compressor outlet and the first tank, and is used to control the on-off of the pipeline in which it is located;

[0046] a second tank including a third port and a fourth port connected to the air compressor outlet and the air compressor inlet, respectively;

[0047] A pneumatic pump comprising a second driving end for providing a driving force and a second pumping end for extracting and discharging air, wherein the second driving end comprises an air inlet connected to the fourth port and an air outlet connected to the air compressor outlet, the second pumping end is provided on a connecting pipeline between the first tank and the air supply port, and the second pumping end comprises a second air extraction port connected to the first tank and a second air outlet connected to the air supply port;

[0048] a third control valve, provided on the connecting pipeline between the fourth port and the air inlet, for controlling the on-off of the pipeline in which it is located;

[0049] The bearing air supply method further comprises:

[0050] Before the water vapor compressor starts working, the second control valve is opened and the air compressor is started, so that the air compressor inhales air from the external environment and inputs air into the first tank and detects the gas pressure P1 in the tank of the first tank; when it is detected that P1 is greater than the first set value P11, the second control valve is closed and the air compressor inputs air into the second tank and detects the gas pressure P2 in the tank of the second tank; when it is detected that P2 is greater than the second set value P21, the third control valve is opened to allow the pneumatic pump to extract gas from the first tank and pump gas to the gas bearing through the air supply port, and after time t1, the water vapor compressor is started and the pressure P3 of the water vapor output from the water vapor outlet is detected; when it is detected that P3 is greater than the third set value P31, the partially compressed water vapor output from the water vapor outlet is input to the first driving end to drive the first pump gas end to work and close the third control valve, and then the air compressor is closed.

[0051] This embodiment detects the pressure of the water vapor output from the water vapor outlet. When it is detected that the water vapor pressure has increased to a pressure that enables the steam-driven air pump to operate effectively, such as a third set value, the controller controls the first control valve to open, allowing water vapor to flow into the steam-driven air pump for driving. This ensures that the steam-driven air pump operates reliably and effectively after startup, thereby ensuring that the steam-driven air pump can reliably drive the air supply cycle for the gas bearing. Before the water vapor compressor is started and before it has started and is operating stably, the air compressor is used to supply air to the gas bearing, ensuring safe and stable startup of the water vapor compressor. After the water vapor compressor is operating stably, the air compressor, the second control valve, the third control valve, and other structures can be closed to switch the air supply drive for the gas bearing to the water vapor of the water vapor compressor and the steam-driven air pump, thereby reducing the unit load and improving water vapor utilization efficiency.

[0052] In some embodiments, the water vapor compression system further comprises:

[0053] a fourth control valve, provided on the connecting pipeline between the air compressor outlet and the third port, for controlling the on-off of the pipeline in which it is located;

[0054] an electrically controlled valve, one end of which is connected to the second tank and the other end of which is connected to the air inlet; when power is off, the electrically controlled valve opens and controls the pipeline in which it is located to connect the second tank and the air inlet; when power is on, the electrically controlled valve closes and controls the pipeline in which it is located to disconnect;

[0055] The bearing air supply method also includes: when it is detected that P3 is greater than the third set value P31, after closing the third control valve, when it is detected that P2 is greater than the fourth set value P22, closing the fourth control valve, and when the power is off, the electric control valve opens and controls the pipeline in which it is located to connect the second tank and the air inlet.

[0056] The bearing air supply method of this embodiment can provide power-off protection for the water vapor compression system. For example, after the water vapor compressor is operating stably, by inflating the second tank and closing the fourth control valve, a certain pressure of compressed air can be maintained in the second tank. If the water vapor compression system loses power due to a fault, the electronically controlled valve opens and conducts, allowing compressed air in the second tank to enter the air inlet through the electronically controlled valve, driving the pneumatic pump to operate for a period of time, maintaining air supply to the gas bearing for a period of time, and thus ensuring that the gas bearing can stop rotating stably.

[0057] Based on the water vapor compression system provided by the present invention, for a water vapor compressor using a gas bearing, a first tank connected to the air supply port and the exhaust port of the gas bearing is provided and a steam-driven air pump is adopted. After the water vapor compressor is working, the water vapor compressed by the water vapor compressor is used to drive the steam-driven air pump to work and to extract air from the first tank to supply air to the gas bearing and to circulate the gas. Therefore, after the water vapor compressor is working, there is no need to use an air compressor to continuously supply air. The water vapor discharged from the water vapor compressor is used as power to circulate and supply air to the bearing, which can reduce the operating load of the unit.

[0058] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0060] Figure 1 Schematic diagram of the structural principle of a water vapor compression system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0062] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0064] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] like Figure 1 As shown, the water vapor compression system of this embodiment includes a water vapor compressor 1, a first tank 2 and a steam-driven air pump.

[0067] like Figure 1 As shown, the water vapor compressor 1 is used to compress water vapor. The water vapor compressor 1 includes a gas bearing, an air supply port 11 and an air exhaust port 12 for supplying and exhausting gas to the gas bearing, respectively, a water vapor inlet 13 for inputting the water vapor to be compressed, and a water vapor outlet 14 for outputting the compressed water vapor. The water vapor compressor of this embodiment uses a gas bearing to support the rotor. The gas bearing is a sliding bearing that uses gas as a lubricant. The most commonly used gas lubricant is air, but nitrogen, argon, hydrogen, helium, or carbon dioxide can also be used as needed. In this embodiment, gas is introduced into the gas bearing through the air supply port 11 for lubrication, and the gas is then discharged through the air exhaust port 12. When the water vapor compressor 1 is in operation, the water vapor to be compressed is introduced through the water vapor inlet 13. After the water vapor is compressed by the water vapor compressor, its temperature and pressure are increased, and then it is output through the water vapor outlet 14.

[0068] The first tank 2 is used to store compressed gas for the gas bearing. The first tank 2 includes a first port 21 and a second port 22 connected to the gas supply port 11 and the exhaust port 12, respectively. When the gas bearing uses air as a lubricant, the first tank 2 is used to store compressed air. When other gases are used as lubricants for the gas bearing, the first tank is used to store other compressed gases. When gas is introduced into the gas bearing, the first tank 2 outputs the gas in the tank through the first port 21, and sends the output gas into the gas bearing through the gas supply port 11. The gas output by the gas bearing is then output through the exhaust port, and then returns to the first tank through the second port 22 of the first tank 2. During the continuous operation of the water vapor compressor, the gas in the first tank 2 is continuously output to the gas bearing, and the gas bearing is continuously sent back to the first tank. The gas circulates, and the gas bearing is continuously supported and lubricated by the continuous gas.

[0069] like Figure 1 As shown, the steam-driven air pump includes a first driving end 15 for providing driving force and a first pumping end 16 for extracting and discharging air. The first driving end 15 includes a steam inlet 151 connected to the water vapor outlet 14. The first pumping end 16 is provided on the connecting pipeline between the first port 21 and the air supply port 11. The first pumping end 16 includes a first air extraction port 161 connected to the first port 21 and a first air outlet 162 connected to the air supply port 11. That is, the steam-driven air pump drives the steam-driven air pump to operate by inputting water vapor into the first driving end. For example, the first driving end and the first pumping end are coaxially arranged. After the first driving end rotates after inputting water vapor, the rotating shaft of the first driving end drives the rotating shaft of the first pumping end to rotate. The first pumping end realizes the function of extracting air from the first tank and outputting gas to the air supply port 11.

[0070] The water vapor compression system of this embodiment, for the water vapor compressor 1 using gas bearings, is provided with a first tank 2 connected to the air supply port 11 and the exhaust port 12 of the gas bearing and a steam-driven air pump. After the water vapor compressor 1 is working, the water vapor compressed by the water vapor compressor 1 is used to drive the steam-driven air pump to work and to extract air from the first tank 2 to supply air to the gas bearing and to circulate the gas. Therefore, after the water vapor compressor 1 is working, there is no need to use an air compressor to continuously supply air. The water vapor discharged from the water vapor compressor 1 is used as power to circulate and supply air to the bearings, which can reduce the operating load of the unit.

[0071] In some embodiments, as Figure 1As shown, the first driving end 15 further includes a steam outlet 152 connected to the water vapor inlet 13. In this embodiment, the first driving end 15 can output water vapor from the steam outlet 152 to the water vapor inlet 13, and then enter the water vapor compressor for compression again. By returning the water vapor that has entered the first driving end 15 and performed work on the first driving end to the water vapor compressor for compression, the water vapor that has performed work on the steam-driven air pump can be reused, thereby improving the utilization efficiency of the water vapor.

[0072] In some embodiments, as Figure 1 As shown, the water vapor compression system further includes a first control valve 31, a first pressure sensor 41 and a controller.

[0073] The first control valve 31 is disposed in the connecting pipeline between the steam inlet 151 and the water vapor outlet 14. The first control valve 31 is used to control the on / off state of the pipeline. When the first control valve 31 is open, it is connected, and the pipeline in which it is located is connected. When the first control valve 31 is closed, it is disconnected, and the pipeline in which it is located is disconnected. Specifically, the first control valve 31 comprises an on / off valve, such as an electromagnetic on / off valve, and is opened and closed by energizing and de-energizing the first control valve 31.

[0074] The first pressure sensor 41 is used to detect the pressure of water vapor in the connecting pipeline between the steam inlet 151 and the water vapor outlet 14. In the embodiment shown in the figure, the first pressure sensor 41 detects the pressure of water vapor in the connecting pipeline between the first control valve 31 and the water vapor outlet 14.

[0075] The controller is signal-connected to the first control valve 31 and the first pressure sensor 41 . The controller is used to control the first control valve 31 to open or close the pipeline in which it is located according to the detection result of the first pressure sensor 41 .

[0076] In the initial startup phase after the water vapor compressor starts, the pressure of the water vapor output from the water vapor outlet 14 is still unstable, and the pressure of the water vapor is not sufficient to enable the steam-driven air pump to operate stably. In this embodiment, the pressure of the water vapor output from the water vapor outlet is detected by a first pressure sensor. When it is detected that the water vapor pressure increases to a pressure that enables the steam-driven air pump to work effectively, for example, increases to a third set value P31, the controller controls the first control valve 31 to open, allowing water vapor to flow into the steam-driven air pump for driving. This ensures that the steam-driven air pump works reliably and effectively after it is started, thereby ensuring that the start of the steam-driven air pump can reliably drive the operation of the air supply cycle for the gas bearing.

[0077] In some embodiments, the water vapor compression system further includes a pressure control valve 5 .

[0078] like Figure 1 As shown, the pressure control valve 5 includes a valve body 55, a valve core 56, a first valve port 51 provided on the valve body 55, a second valve port 52 connected to the first valve port 51 and provided on the valve body 55, a feedback valve port 53 provided on the valve body 55 and connected to the second valve port 52, and a spring 54 connected to the valve core 56. The elastic force of the spring 54 causes the valve core 56 to move in a direction that increases the flow area connecting the first valve port 51 and the second valve port 52. The pressure of the fluid entering the feedback valve port 53 causes the valve core 56 to move in a direction that reduces the flow area connecting the first valve port 51 and the second valve port 52. The first valve port 51 is connected to the first air outlet 162, and the second valve port 52 is connected to the air supply port 11. In this embodiment, when the water vapor compressor is working, the gas output from the first tank enters the pressure control valve 5 through the first valve port 51 of the pressure control valve 5, and is then output to the air supply port from the second valve port 52. Since the valve core 56 is subjected to the pressure of the spring 56 and the feedback valve port 53 at the same time, when the forces on the valve core are balanced, the pressure at the feedback valve port 53 is equal to the elastic force of the spring 56, and the elastic force of the spring 56 remains stable, thereby maintaining the pressure at the feedback valve port 53 stable. That is, the pressure at the second valve port 52 connected to the feedback valve port 53, which has the same pressure as the pressure at the feedback valve port 53, also remains stable. Therefore, the setting of the pressure control valve can keep the air supply pressure to the gas bearing stable, thereby ensuring the stable operation of the bearing and the life of the bearing.

[0079] In some embodiments, as Figure 1 As shown, the water vapor compression system further includes an air compressor 6 , a second control valve 32 , a second tank 7 , a pneumatic pump and a third control valve 33 .

[0080] The air compressor 6 includes an air compressor inlet 61 and an air compressor outlet 62 for inputting air and outputting compressed air respectively. The air compressor outlet 62 is connected to the first tank 2 .

[0081] The second control valve 32 is located in the connecting pipeline between the air compressor outlet 62 and the first tank 2. It controls the flow of the pipeline. The air compressor 6 draws in air through the compressor inlet 61, compresses it, and then outputs the compressed air from the compressor outlet 62. When the second control valve 32 is open, the compressed air output from the compressor outlet is input into the first tank 2. The function and principle of the second control valve 32 are similar to those of the first control valve 31.

[0082] The second tank 7 includes a third port 71 and a fourth port 72 connected to the air compressor outlet 62 and the air compressor inlet 61, respectively. Thus, a connecting pipe is directly provided between the air compressor outlet 62 and the second tank 7. When the connecting pipe is connected, the compressed air output from the air compressor outlet is input into the second tank 7. A connecting pipe is directly provided between the fourth port of the second tank 7 and the air compressor inlet 61. When the connecting pipe is connected, the air output from the fourth port of the second tank 7 is input into the air compressor inlet 61.

[0083] The pneumatic pump includes a second driving end 73 for providing driving force and a second pumping end 74 for extracting and discharging air. The second driving end 73 includes an air inlet connected to the fourth port 72 and an air outlet connected to the air compressor outlet 62. The second pumping end 74 is arranged on the connecting pipeline between the first tank 2 and the air supply port 11. The second pumping end 74 includes a second air extraction port connected to the first tank 2 and a second air outlet connected to the air supply port 11. The pneumatic pump of this embodiment has a similar function to that of a steam-driven air pump. The pneumatic pump is driven to work by inputting compressed air into the first driving end. For example, the second driving end and the second pumping end are coaxially arranged. After the second tank outputs compressed air through the fourth port and inputs compressed air to the second driving end through the air inlet, the second driving pump rotates, and the rotating shaft of the second driving end drives the rotating shaft of the second pumping end to rotate. The second pumping end realizes the function of extracting air from the second tank and outputting gas to the air supply port 11.

[0084] The third control valve 33 is located in the connecting pipeline between the fourth port 72 and the air inlet. It controls the flow of the pipeline. When the third control valve 33 is opened, compressed air from the second tank is fed through it and into the air inlet, thereby driving the pneumatic pump. The function and principle of the third control valve 33 are similar to those of the first control valve 31.

[0085] This embodiment, through the arrangement of structures such as the air compressor, the second tank, the pneumatic pump, the second control valve and the third control valve, can realize the inflation of the first tank and the use of the air compressor to extract gas from the first tank and supply gas to the gas bearing. Therefore, before the water vapor compressor is working stably, the operation of the air compressor can be used to supply gas to the gas bearing, thereby ensuring the safe and stable startup of the water vapor compressor. After the water vapor compressor is working stably, the air supply drive to the gas bearing can be switched to the water vapor and steam-driven air pump of the water vapor compressor by closing the air compressor, thereby reducing the unit load and improving the water vapor utilization efficiency.

[0086] In some embodiments, the water vapor compression system further includes a fourth control valve 34 and an electric control valve 35 .

[0087] The fourth control valve 34 is located in the connecting pipeline between the air compressor outlet 62 and the third port 71. The fourth control valve 34 is used to control the on / off state of the pipeline in which it is located. After the air compressor 6 draws in air through the air compressor inlet 61, it compresses the air and then outputs the compressed air from the air compressor outlet 62. When the fourth control valve 34 is open, the compressed air output from the air compressor outlet is input into the second tank 7 through the fourth control valve 34. When the fourth control valve 34 is closed, the connecting pipeline between the air compressor and the third port 71 of the second tank 7 is disconnected, and the compressed air output from the air compressor is not input into the second tank 7. The function and principle of the fourth control valve 34 are similar to those of the first control valve 31.

[0088] One end of the electrically controlled valve 35 is connected to the second tank 7, and the other end is connected to the air inlet. The connection between the electrically controlled valve 35 and the second tank 7 can be achieved through a fourth port 72, or by providing a separate connection port on the second tank 7. When the power is off, the electrically controlled valve 35 opens and controls the connection of the pipeline in which it is located, thereby connecting the second tank 7 to the air inlet. When the power is on, the electrically controlled valve 35 closes and controls the disconnection of the pipeline in which it is located. The electrically controlled valve 35 can be a solenoid-controlled valve. When the power is on, the electrically controlled valve 35 opens, and when the power is off, the electrically controlled valve 35 opens, allowing the compressed air in the second tank 7 to enter the air inlet through the electrically controlled valve 35, thereby driving the pneumatic pump. The provision of the fourth control valve and the electrically controlled valve in this embodiment can provide a power-off protection for the water vapor compression system. For example, after the water vapor compressor stabilizes, the compressed air in the second tank can be maintained at a certain pressure by inflating the second tank and closing the fourth control valve. When the water vapor compression system loses power due to a fault, the electric control valve 35 opens and conducts due to the power failure, and the compressed air in the second tank 7 can enter the air inlet through the electric control valve 35, driving the pneumatic pump to work for a period of time, so that the gas bearing can maintain air supply for a period of time, thereby ensuring that the gas bearing can stop safely.

[0089] In some embodiments, the water vapor compression system further includes a second pressure sensor 42 and a third pressure sensor 43 .

[0090] The second pressure sensor 42 is used to detect the pressure of the gas in the first tank 2;

[0091] The third pressure sensor 43 is used to detect the pressure of the gas in the second tank 7;

[0092] The controller is signal-connected to the second control valve 32, the third control valve 33, the fourth control valve 34, the second pressure sensor 42, and the third pressure sensor 43. The controller is configured to control the opening and closing of the pipelines in which the second control valves 32, the third control valve 33, and the fourth control valve 34 are located based on the detection results of the second pressure sensor 42 and the third pressure sensor 43. In the water vapor compression system of this embodiment, the provision of the second pressure sensor 42 and the third pressure sensor 43 enables timely monitoring of the gas pressures within the first and second tanks, thereby enabling the controller to promptly control the water vapor compression system. For example, before the water vapor compressor is started, the air compressor inflates the first tank. When the second pressure sensor 42 detects that the gas pressure P1 within the first tank is greater than the first set value P11, indicating that sufficient air has been filled into the first tank, the second control valve can be promptly closed and the fourth control valve opened to inflate the second tank. When the third pressure sensor 43 detects that the gas pressure P2 in the second tank is greater than the second set value P21, it means that the pressure of the air filled in the second tank can effectively drive the pneumatic pump. At this time, the third control valve can be opened in time to use the gas output from the second tank to drive the pneumatic pump, and the pneumatic pump can be used to evacuate the first tank and supply air to the gas bearing. After closing the third control valve to stop driving the pneumatic pump and using the water vapor output from the water vapor compressor to drive the steam-driven air pump to supply air to the gas bearing, when the third pressure sensor 43 detects that the gas pressure P2 in the second tank is greater than the fourth set value P22, it means that the air filled in the second tank can drive the pneumatic pump to work effectively for a period of time after a power failure, ensuring that the gas bearing can stop stably. At this time, the fourth control valve can be controlled to close, so that the compressed air for power failure protection is stored in the second tank.

[0093] In some embodiments, the water vapor compression system further includes an air treatment device, which includes a drying filter 81 for drying the air and / or an electrostatic dust collector 82 for removing dust from the air. The air treatment device is provided on the connecting pipeline between the air compressor outlet 62 and the first tank 2 and is also provided on the connecting pipeline between the air compressor outlet 62 and the third port 71. During the process of the air compressor inhaling external air and compressing the air, various components in the air may undergo physical or chemical changes, thereby forming various impurities such as moisture and dust particles. If these impurities are not treated and directly enter the gas bearings of the water vapor compressor, they will damage the gas bearings during operation, thereby reducing the service life of the bearings. By introducing a drying filter and an electrostatic dust collector, this embodiment can reduce moisture in the air, improve the cleanliness of the air supply, ensure stable operation of the bearings, and guarantee the service life of the bearings.

[0094] In some embodiments, a bearing air supply method using any of the above-mentioned water vapor compression systems is also disclosed. The bearing air supply method includes:

[0095] After the water vapor compressor 1 starts working, the partially compressed water vapor outputted from the water vapor outlet 14 is inputted into the first driving end 15 to drive the first pumping end 16 to work;

[0096] The first pumping port 16 is used to extract gas from the first tank 2 and pump the gas to the gas bearing through the gas supply port 11 , and the gas output from the exhaust port 12 is input to the first tank 2 through the second port 22 .

[0097] The bearing air supply method of this embodiment uses the water vapor compressed by the water vapor compressor 1 to drive the steam-driven air pump to work and extract air from the first tank 2 to supply air to the gas bearing and circulate the gas after the water vapor compressor 1 starts working. Therefore, there is no need to use an air compressor to continuously supply air after the water vapor compressor 1 starts working. The water vapor discharged from the water vapor compressor 1 is used as power to circulate air to the bearing, which can reduce the operating load of the unit.

[0098] In some embodiments, the first driving end 15 further includes a steam outlet 152 connected to the water vapor inlet 13 , and the bearing air supply method further includes: returning the water vapor output from the first driving end 15 to the water vapor inlet 13 to be compressed again by the water vapor compressor 1 .

[0099] In the bearing air supply method of this embodiment, the first driving end 15 can output water vapor from the steam outlet 152 to the water vapor inlet 13, and then enter the water vapor compressor for compression again. By returning the water vapor that has entered the first driving end 15 and performed work on the first driving end to the water vapor compressor for compression, the water vapor that has performed work on the steam-driven air pump can be reused, thereby improving the utilization efficiency of the water vapor.

[0100] In some embodiments, the water vapor compression system further includes an air compressor 6 , a second control valve 32 , a second tank 7 , a third tank 7 , and a third control valve 33 .

[0101] The air compressor 6 includes an air compressor inlet 61 and an air compressor outlet 62 for inputting air and outputting compressed air respectively, and the air compressor outlet 62 is connected to the first tank 2;

[0102] The second control valve 32 is provided on the connecting pipeline between the air compressor outlet 62 and the first tank 2, and is used to control the on-off of the pipeline in which it is located;

[0103] The second tank 7 includes a third port 71 and a fourth port 72 connected to the air compressor outlet 62 and the air compressor inlet 61, respectively;

[0104] The pneumatic pump includes a second driving end 73 for providing driving force and a second pumping end 74 for extracting and discharging air. The first driving end 15 includes an air inlet connected to the fourth port 72 and an air outlet connected to the air compressor outlet 62. The second pumping end 74 is provided on the connecting pipeline between the first tank 2 and the air supply port 11. The second pumping end 74 includes a second air extraction port connected to the first tank 2 and a second air outlet connected to the air supply port 11.

[0105] The third control valve 33 is provided on the connecting pipeline between the fourth port 72 and the air inlet, and is used to control the on-off of the pipeline in which it is located;

[0106] Bearing air supply methods also include:

[0107] Before the water vapor compressor 1 starts working, the second control valve 32 is opened and the air compressor 6 is started, so that the air compressor 6 inhales air from the external environment and inputs air to the first tank 2, and the gas pressure P1 in the tank of the first tank 2 is detected; when it is detected that P1 is greater than the first set value P11, the second control valve 32 is closed and the air compressor 6 inputs air to the second tank 7, and the gas pressure P2 in the tank of the second tank 7 is detected; when it is detected that P2 is greater than the second set value P21, the third control valve 33 is opened to allow the pneumatic pump to extract gas from the first tank 2 and pump gas to the gas bearing through the gas supply port 11, and after time t1 (for example, after 5 minutes, at this time the entire gas supply circuit for supplying gas to the gas bearing has completed the cycle and is operating stably), the water vapor compressor 1 is started and the pressure P3 of the water vapor output from the water vapor outlet 14 is detected; when it is detected that P3 is greater than the third set value P31, the partially compressed water vapor output from the water vapor outlet 14 is input to the first driving end 15 to drive the first pumping end 16 to work, the third control valve 33 is closed, and then the air compressor 6 is turned off.

[0108] This embodiment detects the pressure of the water vapor output from the water vapor outlet. When it is detected that the water vapor pressure has increased to a pressure that enables the steam-driven air pump to operate effectively, such as a third set value P31, the controller controls the first control valve 31 to open, allowing water vapor to flow into the steam-driven air pump for driving. This ensures that the steam-driven air pump operates reliably and effectively after startup, thereby ensuring that the steam-driven air pump can reliably drive the air supply cycle for the gas bearing. Before the water vapor compressor is started and before it has stabilized after startup, the air compressor is used to supply air to the gas bearing, ensuring safe and stable startup of the water vapor compressor. After the water vapor compressor stabilizes, the air compressor, the second control valve, the third control valve, and other structures can be closed to switch the air supply drive for the gas bearing to the water vapor of the water vapor compressor and the steam-driven air pump, thereby reducing the unit load and improving water vapor utilization efficiency.

[0109] In some embodiments, the water vapor compression system further comprises:

[0110] The fourth control valve 34 is provided on the connecting pipeline between the air compressor outlet 62 and the third port 71, and is used to control the on-off of the pipeline in which it is located;

[0111] The electric control valve 35 has one end connected to the second tank 7 and the other end connected to the air inlet. When the power is off, the electric control valve 35 opens and controls the pipeline in which it is located to connect the second tank 7 and the air inlet. When the power is on, the electric control valve 35 closes and controls the pipeline in which it is located to disconnect.

[0112] The bearing air supply method also includes: when it is detected that P3 is greater than the third set value P31, after closing the third control valve 33, when it is detected that P2 is greater than the fourth set value P22, closing the fourth control valve 34, and when the power is off, the electric control valve 35 opens and controls the pipeline in which it is located to connect the second tank 7 and the air inlet.

[0113] The bearing air supply method of this embodiment can provide power-off protection for the water vapor compression system. For example, after the water vapor compressor is operating stably, by inflating the second tank and closing the fourth control valve, a certain pressure of compressed air can be maintained in the second tank. If the water vapor compression system loses power due to a fault, the electronically controlled valve 35 opens and conducts due to the power outage. The compressed air in the second tank 7 can enter the air inlet through the electronically controlled valve 35, drive the pneumatic pump to operate for a period of time, and maintain the air supply to the gas bearing for a period of time, thus ensuring that the gas bearing can stop rotating stably.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A water vapor compression system, characterized in that: include: A water vapor compressor (1) comprises a gas bearing, a gas supply port (11) and a gas exhaust port (12) for respectively supplying gas to and exhausting gas from the gas bearing, a water vapor inlet (13) for inputting water vapor to be compressed, and a water vapor outlet (14) for outputting the compressed water vapor; a first tank (2) for storing compressed gas for the gas bearing, comprising a first port (21) and a second port (22) connected to the gas supply port (11) and the gas exhaust port (12) respectively; A steam-driven air pump comprises a first driving end (15) for providing driving force and a first air pumping end (16) for extracting and discharging air, wherein the first driving end (15) comprises a steam inlet (151) connected to the water vapor outlet (14), the first air pumping end (16) is arranged on a connecting pipeline between a first port (21) and the air supply port (11), and the first air pumping end (16) comprises a first air extraction port (161) connected to the first port (21) and a first air outlet (162) connected to the air supply port (11).

2. The water vapor compression system according to claim 1, wherein The first driving end (15) further comprises a steam outlet (152) connected to the water vapor inlet (13).

3. The water vapor compression system according to claim 1, wherein Also includes: a first control valve (31), provided on the connecting pipeline between the steam inlet (151) and the water vapor outlet (14), for controlling the on-off of the pipeline in which it is located; a first pressure sensor (41) for detecting the pressure of water vapor on the connecting pipe between the steam inlet (151) and the water vapor outlet (14); A controller is connected to the first control valve (31) and the first pressure sensor (41) via signals, and is used to control the first control valve (31) to open or close the pipeline in which it is located according to the detection result of the first pressure sensor (41).

4. The water vapor compression system according to claim 1, wherein Also includes: A pressure control valve (5) comprises a valve body (55), a valve core (56), a first valve port (51) provided on the valve body (55), a second valve port (52) provided on the valve body (55) and communicating with the first valve port (51), a feedback valve port (53) provided on the valve body (55) and communicating with the second valve port (52), and a spring (54) connected to the valve core (56). The elastic force of the spring (54) causes the valve core (56) to move in a direction that increases the flow area of ​​the first valve port (51) and the second valve port (52). The pressure of the fluid introduced into the feedback valve port (53) causes the valve core (56) to move in a direction that decreases the flow area of ​​the first valve port (51) and the second valve port (52). The first valve port (51) is connected to the first air outlet (162), and the second valve port (52) is connected to the air supply port (11).

5. The water vapor compression system according to any one of claims 1 to 4, characterized in that: Also includes: an air compressor (6), comprising an air compressor inlet and an air compressor outlet for inputting air and outputting compressed air respectively, wherein the air compressor outlet is connected to the first tank (2); A second control valve (32) is provided on the connecting pipeline connecting the air compressor outlet and the first tank (2), and is used to control the on-off of the pipeline in which it is located; The second tank (7) includes a third port (71) and a fourth port (72) connected to the air compressor outlet and the air compressor inlet, respectively; A pneumatic pump comprising a second driving end (73) for providing a driving force and a second pumping end (74) for extracting and discharging air, wherein the second driving end (73) comprises an air inlet connected to the fourth port (72) and an air outlet connected to the air compressor outlet, and the second pumping end (74) is provided on a connecting pipeline between the first tank (2) and the air supply port (11), and the second pumping end (74) comprises a second air extraction port connected to the first tank (2) and a second air outlet connected to the air supply port (11); The third control valve (33) is provided on the connecting pipeline between the fourth port (72) and the air inlet, and is used to control the on-off of the pipeline in which it is located.

6. The water vapor compression system according to claim 5, wherein: Also includes: a fourth control valve (34), provided on the connecting pipeline between the air compressor outlet and the third port (71), for controlling the on-off of the pipeline in which it is located; An electric control valve (35) is connected to the second tank (7) at one end and to the air inlet at the other end. When the power is off, the electric control valve (35) opens and controls the pipeline in which it is located to connect the second tank (7) and the air inlet. When the power is on, the electric control valve (35) closes and controls the pipeline in which it is located to disconnect.

7. The water vapor compression system according to claim 6, wherein: Also includes: a second pressure sensor (42) for detecting the pressure of the gas in the first tank (2); a third pressure sensor (43) for detecting the pressure of the gas in the second tank (7); A controller is connected to the second control valve (32), the third control valve (33), the fourth control valve (34), the second pressure sensor (42) and the third pressure sensor (43) for controlling the second control valve (32), the third control valve (33) and the fourth control valve (34) to open or close the pipeline in which they are located according to the detection results of the second pressure sensor (42) and the third pressure sensor (43).

8. The water vapor compression system according to claim 5, wherein: The invention also includes an air treatment device, which includes a drying filter for drying the air and / or an electrostatic dust collection device for removing dust from the air. The air treatment device is arranged on the connecting pipeline between the air compressor outlet and the first tank (2) and is also arranged on the connecting pipeline between the air compressor outlet and the third port (71).

9. A bearing air supply method using the water vapor compression system according to any one of claims 1 to 8, characterized in that: include: After the water vapor compressor (1) starts to work, the partially compressed water vapor outputted from the water vapor outlet (14) is inputted into the first driving end (15) to drive the first pumping end (16) to work; The first pumping port (16) is used to extract gas from the first tank (2) and pump gas to the gas bearing through the gas supply port (11), and the gas output from the exhaust port (12) is input to the first tank (2) through the second port (22).

10. The bearing air supply method according to claim 9, characterized in that: The first driving end (15) further includes a steam outlet (152) connected to the water vapor inlet (13), and the bearing air supply method further includes: returning the water vapor output from the first driving end (15) to the water vapor inlet (13) to be compressed again by the water vapor compressor (1).

11. The bearing air supply method according to claim 9, characterized in that: The water vapor compression system further comprises: an air compressor (6), comprising an air compressor inlet and an air compressor outlet for inputting air and outputting compressed air respectively, wherein the air compressor outlet is connected to the first tank (2); A second control valve (32) is provided on the connecting pipeline connecting the air compressor outlet and the first tank (2), and is used to control the on-off of the pipeline in which it is located; The second tank (7) includes a third port (71) and a fourth port (72) connected to the air compressor outlet and the air compressor inlet, respectively; A pneumatic pump comprising a second driving end (73) for providing a driving force and a second pumping end (74) for extracting and discharging air, wherein the second driving end (73) comprises an air inlet connected to the fourth port (72) and an air outlet connected to the air compressor outlet, and the second pumping end (74) is provided on a connecting pipeline between the first tank (2) and the air supply port (11), and the second pumping end (74) comprises a second air extraction port connected to the first tank (2) and a second air outlet connected to the air supply port (11); a third control valve (33), provided on the connecting pipeline between the fourth port (72) and the air inlet, for controlling the on-off of the pipeline in which it is located; The bearing air supply method further comprises: Before the water vapor compressor (1) starts working, the second control valve (32) is opened and the air compressor (6) is started, so that the air compressor (6) inhales air from the external environment and inputs air to the first tank (2) and detects the gas pressure P1 in the tank of the first tank (2); when it is detected that P1 is greater than a first set value P11, the second control valve (32) is closed and the air compressor (6) inputs air to the second tank (7) and detects the gas pressure P2 in the tank of the second tank (7); when it is detected that P2 is greater than a second set value P21, the second control valve (32) is opened. The third control valve (33) is used to enable the pneumatic pump to extract gas from the first tank (2) and pump gas to the gas bearing through the gas supply port (11), and after a time t1, the water vapor compressor (1) is started and the pressure P3 of the water vapor output from the water vapor outlet (14) is detected; when it is detected that P3 is greater than a third set value P31, the partially compressed water vapor output from the water vapor outlet (14) is input to the first driving end (15) to drive the first pumping end (16) to work and close the third control valve (33), and then the air compressor (6) is closed.

12. The bearing air supply method according to claim 11, characterized in that: The water vapor compression system further comprises: a fourth control valve (34), provided on the connecting pipeline between the air compressor outlet and the third port (71), for controlling the on-off of the pipeline in which it is located; an electrically controlled valve (35), one end of which is connected to the second tank (7) and the other end of which is connected to the air inlet; when the power is off, the electrically controlled valve (35) opens and controls the pipeline in which it is located to connect the second tank (7) and the air inlet; when the power is on, the electrically controlled valve (35) closes and controls the pipeline in which it is located to disconnect; The bearing air supply method further includes: when it is detected that P3 is greater than a third set value P31, after closing the third control valve (33), when it is detected that P2 is greater than a fourth set value P22, closing the fourth control valve (34), and when the power is off, the electric control valve (35) opens and controls the pipeline in which it is located to connect the second tank (7) and the air inlet.

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