A static pressure gas suspension system and a method and device for regulating the same

Abstract

The application discloses a static pressure gas suspension system and a regulating method and device thereof. The system comprises an auxiliary gas supply pipeline added to a gas suspension compressor from a high-pressure side, an electronic expansion valve arranged on the auxiliary gas supply pipeline and used for adjusting gas supply superheat, and a flow regulating pipeline added between a gas supply pipeline and a gas return pipeline, a bypass electromagnetic valve arranged on the flow regulating pipeline and used for adjusting gas supply flow to stabilize a gas supply pressure difference of a gas bearing. The electronic expansion valve of the auxiliary gas supply pipeline is used for controlling the gas supply superheat, the bypass electromagnetic valve of the flow regulating pipeline is used for controlling the gas supply flow, and the static pressure gas suspension bearing obtains continuous, stable and temperature-controllable gaseous refrigerant during unit operation, so that the static pressure gas suspension bearing is ensured to be stably operated and precision-controllable, and unit reliability is improved. Meanwhile, the gas supply amount of the compressor bearing is avoided to be excessive, power consumption is saved, and operation efficiency of the water chiller is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of static pressure gas suspension system, in particular to a static pressure gas suspension system and a control method and device thereof. BACKGROUND

[0002] At present, the compressor bearing of the centrifugal unit mainly adopts oil lubricated bearing, and in recent years, new bearing suspension technologies such as magnetic suspension bearing and gas bearing have also begun to emerge. The static pressure gas suspension centrifugal compressor uses the buoyancy generated by high pressure gas to lift the rotor away from the bearing, thereby realizing the suspension of the rotor, and has the advantages of small friction loss, small size, and no oil. Compared with oil lubricated bearing, the gas suspension bearing has small bearing capacity and is easy to wear. Ensuring the stability of the gas supply of the gas bearing to provide sufficient buoyancy is a necessary condition for the stable operation of the gas suspension compressor.

[0003] Figure 1 The static pressure gas suspension system of the related art is shown in the structural schematic diagram as Figure 1 The system includes a condenser 1, a gas supply compressor 2, a gas storage tank 3, a gas suspension compressor 5, a gas storage tank temperature sensor 7, and a gas supply temperature sensor 8. In the static pressure gas suspension bearing water chiller, a certain flow, pressure, and temperature of gaseous refrigerant need to be continuously provided to the gas suspension bearing to ensure the normal and reliable operation of the static pressure gas suspension bearing. When the unit is normally operated, the pressure difference between the evaporator and the condenser is generally directly used to meet the bearing gas supply demand, that is, high pressure gas is directly taken from the condenser to supply gas to the static pressure gas suspension bearing. However, the high pressure gas has a large flow rate and a high temperature, and improper control may cause problems such as bearing overheating and unstable suspension, directly affecting the bearing accuracy and reliability.

[0004] For the poor running stability of the static pressure gas suspension bearing in the prior art, no effective solution has been proposed. SUMMARY

[0005] The static pressure gas suspension system and the control method and device thereof provided in the embodiments of the present application solve the problem of poor running stability of the static pressure gas suspension bearing in the prior art.

[0006] To solve the above technical problems, the present application provides a static pressure gas suspension system, which comprises a gas supply pipeline from the high pressure side to the gas suspension compressor, and the gas supply pipeline is connected in sequence with a condenser, a gas supply compressor, a gas storage tank, and a gas suspension compressor; the system further comprises a gas return pipeline from the gas suspension compressor to the low pressure side, wherein the system further comprises an auxiliary gas supply pipeline added from the high pressure side to the gas suspension compressor, an electronic expansion valve is arranged on the auxiliary gas supply pipeline, and the electronic expansion valve is used for adjusting the superheat degree of the gas supply; a flow adjusting pipeline is added between the gas supply pipeline and the gas return pipeline, a bypass electromagnetic valve is arranged on the flow adjusting pipeline, and the bypass electromagnetic valve is used for adjusting the gas supply flow to stabilize the gas supply pressure difference of the gas bearing.

[0007] Further, the high-pressure side is a high-pressure side of the condenser, and the low-pressure side is a low-pressure side of the condenser; one end of the auxiliary gas supply pipeline is connected to the gas storage tank, and the other end is arranged on a pipeline between the gas storage tank and the gas suspension compressor.

[0008] The application further provides a regulating method of the static pressure gas suspension system, which is applied to the static pressure gas suspension system and comprises the following steps: obtaining a gas supply superheat degree of the static pressure gas suspension system; adjusting an opening degree of an electronic expansion valve on the auxiliary gas supply pipeline according to the gas supply superheat degree; obtaining a gas supply saturation temperature of the static pressure gas suspension system; and adjusting the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of a bypass electromagnetic valve according to the gas supply saturation temperature.

[0009] Further, the step of obtaining the gas supply superheat degree of the static pressure gas suspension system comprises the following steps: obtaining a gas storage tank temperature and a gas supply temperature of the static pressure gas suspension system; and calculating the gas supply superheat degree according to the following formula: gas supply superheat degree = gas supply temperature - gas storage tank temperature.

[0010] Further, the step of adjusting the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline according to the gas supply superheat degree comprises the following steps: if the gas supply superheat degree is in a first superheat degree interval, periodically reducing a first preset opening degree of the electronic expansion valve; if the gas supply superheat degree is in a second superheat degree interval, periodically reducing a second preset opening degree of the electronic expansion valve; if the gas supply superheat degree is in a third superheat degree interval, restoring automatic control of the electronic expansion valve; and wherein the first preset opening degree is greater than the second preset opening degree, and the first superheat degree interval to the third superheat degree interval is divided according to an increasing trend of the superheat degree.

[0011] Further, the step of obtaining the gas supply saturation temperature of the static pressure gas suspension system comprises the following steps: obtaining a gas supply pressure of the static pressure gas suspension system; and converting the gas supply pressure into the gas supply saturation temperature; or obtaining a gas storage tank pressure of the static pressure gas suspension system; and converting the gas storage tank pressure into a gas storage tank saturation temperature, and taking the gas storage tank saturation temperature as the gas supply saturation temperature.

[0012] Further, the step of adjusting the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of the bypass electromagnetic valve according to the gas supply saturation temperature comprises the following steps:

[0013] calculating a temperature difference between the gas supply saturation temperature and a target gas supply temperature;

[0014] if the temperature difference is in a first temperature difference interval, periodically increasing a third preset opening degree of the electronic expansion valve and closing the bypass electromagnetic valve;

[0015] If the temperature difference is in a second temperature difference interval, the opening degree of the electronic expansion valve is controlled to remain the current opening degree, and the bypass electromagnetic valve is controlled to be closed.

[0016] If the temperature difference is in a third temperature difference interval, the opening degree of the electronic expansion valve is controlled to periodically decrease by a third preset opening degree, and the bypass electromagnetic valve is controlled to be closed.

[0017] If the temperature difference is in a fourth temperature difference interval, the opening degree of the electronic expansion valve is controlled to periodically decrease by a fourth preset opening degree, and the bypass electromagnetic valve is controlled to be closed.

[0018] If the temperature difference is in a fifth temperature difference interval, the opening degree of the electronic expansion valve is controlled to decrease to zero, and the bypass electromagnetic valve is controlled to be opened.

[0019] Wherein, from the first temperature difference interval to the fifth temperature difference interval is divided in a decreasing temperature trend.

[0020] The application also provides a regulating and controlling device of the static pressure gas suspension system, wherein the device comprises: a first regulating and controlling module, configured to acquire the superheat of the static pressure gas suspension system; adjust the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline according to the superheat; and / or a second regulating and controlling module, configured to acquire the saturation temperature of the static pressure gas suspension system; adjust the opening degree of the electronic expansion valve and the opening and closing of the bypass electromagnetic valve on the auxiliary gas supply pipeline according to the saturation temperature.

[0021] The application also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the method.

[0022] The application provides a static pressure gas suspension bearing water chiller air supply scheme, which controls the superheat of the air supply through the electronic expansion valve on the auxiliary gas supply pipeline, controls the air supply flow through the bypass electromagnetic valve on the flow regulating pipeline, ensures that the static pressure gas suspension bearing obtains continuous, stable and temperature controllable gaseous refrigerant during the operation of the unit, ensures the stable operation and controllable precision of the static pressure gas suspension bearing, and improves the reliability of the unit. Meanwhile, the air supply amount of the compressor bearing is avoided to be too much, the power consumption is saved, and the operation efficiency of the water chiller is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a static pressure gas suspension system of a related technology;

[0024] Figure 2 is a structural schematic diagram of a static pressure gas suspension system according to an embodiment of the application;

[0025] Figure 3is a flow chart of a regulating method of a static pressure gas suspension system according to an embodiment of the present application;

[0026] Figure 4 is a structure block diagram of a regulating device of a static pressure gas suspension system according to an embodiment of the present application;

[0027] 1 - condenser, 2 - supply gas compressor, 3 - gas storage tank, 4 - electronic expansion valve, 5 - gas suspension compressor, 6 - bypass solenoid valve, 7 - gas storage tank temperature sensor, 8 - supply gas temperature sensor, 9 - gas storage tank pressure sensor, 10 - supply gas pressure sensor. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those ordinarily skilled in the art without creative work fall within the scope of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0030] It should be understood that the term "and / or" used herein only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0031] Depending on the context, the word "if" as used herein can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".

[0032] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0033] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example 1

[0035] Figure 2 This is a schematic diagram of the static pressure air suspension system according to an embodiment of the present invention, as shown below. Figure 2 As shown, the system includes: a gas supply line from the high-pressure side to the air-suspension compressor, and a return line from the air-suspension compressor to the low-pressure side. It should be noted that the gas supply line runs from the condenser 1 to the gas supply compressor 2, then to the gas storage tank 3, and finally to the air-suspension compressor 5. The return line runs from the air-suspension compressor 5 to the condenser 1. Therefore, the aforementioned high-pressure side is the high-pressure side of the condenser, and the aforementioned low-pressure side is the low-pressure side of the condenser.

[0036] The system also includes: an auxiliary gas supply pipeline added from the high-pressure side to the air-suspension compressor, one end of which is connected to the gas storage tank 3, and the other end is located on the pipeline between the gas storage tank 3 and the air-suspension compressor 5. An electronic expansion valve 4 is installed on the auxiliary gas supply pipeline to regulate the superheat of the supplied gas; a flow regulating pipeline is added between the gas supply pipeline and the return gas pipeline, and a bypass solenoid valve 6 is installed on the flow regulating pipeline to regulate the gas supply flow rate to stabilize the gas supply pressure difference of the gas bearing.

[0037] In the static pressure gas suspension system provided in this embodiment, the gas supply compressor 2 pressurizes the refrigerant gas and discharges it into the gas storage tank 3. The high-pressure gas in the gas storage tank 3 is then supplied to the gas bearing to generate sufficient buoyancy to lift the rotor away from the bearing, thereby achieving rotor suspension. The gas supply compressor 2 draws gaseous refrigerant from the evaporator. The gas storage tank 3 is equipped with a gas storage tank temperature sensor 7 and a gas storage tank pressure sensor 9. A main gas supply path, an electronic expansion valve temperature regulating gas path, and a solenoid valve bypass path are provided between the gas storage tank 3 and the bearing. An inlet gas temperature sensor 8 and a gas supply pressure sensor 10 are installed before the main gas supply path enters the compressor bearing.

[0038] In a specific implementation, the number of the gas supply compressors 3 can be one, two or more, and different numbers of the gas supply compressors 3 can be set according to actual needs. The number of the bypass solenoid valves 6 can be one, two or more, and the bypass solenoid valves 6 can be electric ball valves or electric butterfly valves, and different numbers of the bypass solenoid valves 6 can be set according to actual needs. The number of the electronic expansion valves 4 can be one, two or more, and the electronic expansion valves 4 can be electric ball valves, and the electronic expansion valves 4 can be set according to actual needs.

[0039] The static pressure gas suspension system provided in the embodiment adjusts the gas supply superheat through the electronic expansion valve arranged on the auxiliary gas supply pipeline, supplies the refrigerant with a suitable temperature, ensures stable operation and controllable precision of the static pressure gas suspension bearing, and improves reliability of the unit.

[0040] Embodiment 2

[0041] Figure 3 The control method of the static pressure gas suspension system according to the embodiment of the application is applied to the static pressure gas suspension system, as shown in Figure 3 The method comprises the following steps:

[0042] In step S301, the gas supply superheat of the static pressure gas suspension system is obtained, and the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline is adjusted according to the gas supply superheat.

[0043] In step S302, the gas supply saturation temperature of the static pressure gas suspension system is obtained, and the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of the bypass solenoid valve are adjusted according to the gas supply saturation temperature.

[0044] The above-mentioned steps S301 and S302 are sequentially executed in the embodiment, and in actual application, the two steps can be executed simultaneously or sequentially (the sequential order is not fixed), and the two steps can be executed independently or together.

[0045] The embodiment provides a gas supply scheme of a static pressure gas suspension bearing water chiller unit. The electronic expansion valve of the auxiliary gas supply pipeline controls the gas supply superheat, the bypass solenoid valve of the flow regulating pipeline controls the gas supply flow, the static pressure gas suspension bearing obtains continuous, stable and temperature-controllable gaseous refrigerant during operation of the unit, and stable operation and controllable precision of the static pressure gas suspension bearing are ensured, and reliability of the unit is improved. Meanwhile, the compressor bearing gas supply amount is avoided to be too large, power consumption is saved, and operation efficiency of the water chiller unit is improved.

[0046] The following describes a scheme for controlling the superheat of the supply gas by means of the electronic expansion valve of the auxiliary supply gas pipeline.

[0047] a1) Obtain the superheat of the supply gas of the static pressure gas suspension system, preferably by obtaining the temperature of the gas tank and the temperature of the supply gas of the static pressure gas suspension system; calculate the superheat of the supply gas according to the following formula: superheat of the supply gas = temperature of the supply gas - temperature of the gas tank. The temperature of the gas tank can be obtained by monitoring the temperature of the gas tank by a temperature sensor, and the temperature of the supply gas can be obtained by monitoring the temperature of the supply gas by a temperature sensor.

[0048] a2) Adjust the opening of the electronic expansion valve on the auxiliary supply gas pipeline according to the superheat of the supply gas, preferably by the following method:

[0049] If the superheat of the supply gas is in the first superheat interval (for example, ≤2℃), control the electronic expansion valve to periodically decrease the first preset opening (for example, 10%);

[0050] If the superheat of the supply gas is in the second superheat interval (for example, 2℃~4℃), control the electronic expansion valve to periodically decrease the second preset opening; wherein the first preset opening is greater than the second preset opening (for example, 5%);

[0051] If the superheat of the supply gas is in the third superheat interval (for example, ≥4℃), control the electronic expansion valve to restore automatic control. Wherein, the first superheat interval to the third superheat interval is divided according to the increasing trend of the superheat.

[0052] It should be noted that the unit control system contains a unit control board, and the control program is burned in the board, which can automatically control various hardware configured by the unit. Among them, the automatic control of the above-mentioned electronic expansion valve means that the control board calculates the current superheat of the supply gas according to the supply gas temperature, the temperature of the gas tank and other parameters collected by the unit, and controls the automatic control action of the electronic expansion valve with the set target superheat of the supply gas as the adjustment target.

[0053] The embodiment realizes the automatic control of the superheat of the supply gas to ensure sufficient supply of the bearing and avoid the liquefaction of the supply gas, which causes the unstable operation of the bearing.

[0054] The following describes a scheme for controlling the flow of the supply gas by means of the bypass electromagnetic valve of the flow regulating pipeline:

[0055] b1) Obtaining the supply saturation temperature of the static pressure air suspension system can preferably be achieved by: obtaining the supply pressure of the static pressure air suspension system; and converting the supply pressure into the supply saturation temperature. Considering that the values ​​of the storage tank saturation temperature and the supply saturation temperature are relatively close, it can also be achieved by: obtaining the storage tank pressure of the static pressure air suspension system; converting the storage tank pressure into the storage tank saturation temperature, and using the storage tank saturation temperature as the supply saturation temperature. The storage tank pressure can be monitored by a storage tank pressure sensor, and the supply pressure can be monitored by a supply pressure sensor.

[0056] b2) Adjusting the opening degree of the electronic expansion valve and the opening and closing of the bypass solenoid valve on the auxiliary gas supply pipeline according to the gas supply saturation temperature can preferably be achieved in the following way:

[0057] Calculate the temperature difference between the gas supply saturation temperature and the target gas supply temperature;

[0058] If the temperature difference is within the first temperature difference range (e.g., greater than 5℃), the opening of the electronic expansion valve is periodically increased to a third preset opening, for example (1℃~5℃), and the bypass solenoid valve is closed.

[0059] If the temperature difference is within the second temperature difference range, for example (-1℃ to 1℃), then the opening of the electronic expansion valve is maintained at the current opening, and the bypass solenoid valve is closed.

[0060] If the temperature difference is within the third temperature difference range, for example (-3℃ to -1℃), the opening of the electronic expansion valve is periodically reduced by the third preset opening (e.g., 5%), and the bypass solenoid valve is closed.

[0061] If the temperature difference is within the fourth temperature difference range, for example [-5℃ to -3℃], the opening of the electronic expansion valve is periodically reduced by the fourth preset opening (e.g., 10%), and the bypass solenoid valve is closed.

[0062] If the temperature difference is within the fifth temperature difference range (e.g., less than -5℃), the opening of the electronic expansion valve is reduced to zero, and the bypass solenoid valve is opened. The temperature difference ranges from the first to the fifth are divided according to a decreasing temperature trend.

[0063] This embodiment controls the superheat of the supplied gas through an electronic expansion valve in the auxiliary gas supply pipeline, supplying gaseous refrigerant at a suitable temperature to ensure stable and precise operation of the static pressure air suspension bearing, thereby improving unit reliability. The bypass solenoid valve in the flow regulation pipeline adjusts the gas supply flow from the high-pressure side to the low-pressure side, regulating the appropriate gas supply volume and maintaining a stable gas bearing supply pressure differential. Based on the above control logic, suitable gas supply temperature and controllable flow are ensured, improving unit reliability.

[0064] Embodiment 3

[0065] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The present embodiment provides a hierarchical adjustment control method for a gas suspension system of aerostatic pressure, which is applied to the gas suspension system of aerostatic pressure in Figure 2 The upper limit of temperature difference, temperature difference 1, temperature difference 2, temperature difference 3, lower limit of temperature difference, temperature difference 4 and temperature difference 5 are set. The default values of the above parameters can be preset values or set according to actual needs. The range of the upper limit of temperature difference, temperature difference 1, temperature difference 2, temperature difference 3, lower limit of temperature difference, temperature difference 4 and temperature difference 5 can be the setting range values shown in this embodiment, or other setting range values, or set according to actual needs.

[0066] The overall process of the adjustment control method of the gas suspension system of aerostatic pressure will be introduced below, which includes the following steps:

[0067] Step 1: Set each temperature limit in the unit controller. Specifically: set the target supply temperature, the upper limit of temperature difference

default 5℃, can be set, range -50℃~50℃

default 1℃, can be set, range -50℃~50℃

default -1℃, can be set, range -50℃~50℃

default -3℃, can be set, range -50℃~50℃

default -5℃, can be set, range -50℃~50℃

default 2℃, can be set, range -50℃~50℃

default 4℃, can be set, range -50℃~50℃

[0068] Step 2: The unit controller automatically converts the supply pressure detected by the supply pressure sensor into the supply saturation temperature according to the refrigerant thermodynamic table; or automatically converts the storage tank pressure detected by the storage tank pressure sensor into the storage tank saturation temperature, and takes the storage tank saturation temperature as the supply saturation temperature. Compare the supply saturation temperature before the supply inlet pipe with the set target supply temperature, and the control target of the electronic expansion valve and the bypass electromagnetic valve = supply saturation temperature-target supply temperature.

[0069] Step 3: Implement hierarchical adjustment control of supply temperature and supply superheat adjustment control according to the control algorithm. Specifically:

[0070] ①Hierarchical adjustment control of supply temperature:

[0071] When “supply saturation temperature-target supply temperature”>5℃

upper limit of temperature difference, can be set

[0072] When “supply saturation temperature-target supply temperature”>1℃

temperature difference 1, can be set

[0073] When "supply gas saturation temperature-target supply gas temperature" <-1℃

temperature difference 2, can be set

[0074] When "supply gas saturation temperature-target supply gas temperature" <-3℃

temperature difference 3, can be set

[0075] When "supply gas saturation temperature-target supply gas temperature" <-5℃

temperature difference lower limit, can be set

[0076] ②Supply gas superheat degree adjustment control:

[0077] In order to ensure sufficient bearing supply and avoid bearing operation instability caused by supply refrigerant liquefaction, the supply gas superheat degree is automatically controlled, and the control priority is ② higher than ①. The supply gas superheat degree = supply gas temperature-tank temperature, which is measured by the tank temperature sensor and the supply gas temperature sensor.

[0078] When the supply gas superheat degree ≤2℃

temperature difference 4, can be set

[0079] When 2℃

temperature difference 4, can be set

temperature difference 5, can be set

[0080] When 4℃

temperature difference 5, can be set

[0081] The main points of the embodiment are: 1) The high-pressure side gas supply pipeline is provided with an electronic expansion valve, which automatically adjusts by detecting the front and rear pressure and temperature, supplies temperature suitable gaseous refrigerant, and ensures that the static pressure gas suspension bearing operating environment temperature is suitable and the bearing precision is controllable according to the hierarchical adjustment algorithm. 2) Under the condition of ensuring sufficient gas supply of the gas bearing, the compressor inlet pressure and inlet quantity are reduced, the auxiliary compressor power consumption is reduced, and the energy efficiency of the water chiller is improved.

[0082] Embodiment 4

[0083] Corresponding to Figure 3 The static pressure gas suspension system control method introduced in the embodiment provides a static pressure gas suspension system control device, as shown in the structural block diagram of the static pressure gas suspension system control device, the device comprises: Figure 4

[0084] The first control module 10 is used for acquiring the supply gas superheat degree of the static pressure gas suspension system; adjusting the opening of the electronic expansion valve on the auxiliary supply pipeline according to the supply gas superheat degree; and / or,

[0085] ​The second regulation module 20 is configured to acquire the supply gas saturation temperature of the static pressure gas suspension system, and adjust the opening degree of the electronic expansion valve on the auxiliary supply gas pipeline and the opening and closing of the bypass electromagnetic valve according to the supply gas saturation temperature.

[0086] The static pressure gas suspension system regulation device provided by the embodiment can adjust the superheat of the supply gas by the electronic expansion valve arranged on the auxiliary supply gas pipeline, supply the refrigerant with appropriate temperature, ensure the stable operation and controllable precision of the static pressure gas suspension bearing, and improve the reliability of the unit.

[0087] Embodiment 5

[0088] The embodiment of the present application provides a software for executing the technical solutions described in the above embodiments and preferred embodiments.

[0089] The embodiment of the present application provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions can execute the static pressure gas suspension system regulation method in any method embodiment.

[0090] The storage medium stores the software, and the storage medium includes but is not limited to an optical disc, a floppy disk, a hard disk, a rewritable memory and the like.

[0091] The product can execute the method provided by the embodiment of the present application, has the function modules and beneficial effects corresponding to the executed method. The technical details not described in the embodiment can be referred to the method provided by the embodiment of the present application.

[0092] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, can be located in one place, or can be distributed on multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment.

[0093] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A static pressure air suspension system, the system comprising a gas supply pipeline from the high-pressure side to an air suspension compressor, the gas supply pipeline being sequentially connected to a condenser, a gas supply compressor, a gas storage tank, and an air suspension compressor; the system further comprising a return gas pipeline from the air suspension compressor to the low-pressure side, characterized in that, The system also includes: An auxiliary gas supply pipeline is added from the high-pressure side to the air suspension compressor. An electronic expansion valve is installed on the auxiliary gas supply pipeline to regulate the superheat of the supplied gas. The high-pressure side is the high-pressure side of the condenser, and the low-pressure side is the low-pressure side of the condenser. One end of the auxiliary gas supply pipeline is connected to the gas storage tank, and the other end is set on the pipeline between the gas storage tank and the air suspension compressor. A flow regulating pipeline is added between the gas supply pipeline and the gas return pipeline. A bypass solenoid valve is installed on the flow regulating pipeline to regulate the gas supply flow rate in order to stabilize the gas supply pressure difference of the gas bearing.

2. A method for controlling a static pressure air suspension system, applied to the static pressure air suspension system of claim 1, characterized in that, The method includes: Obtain the superheat of the gas supply to the static pressure air suspension system; adjust the opening of the electronic expansion valve on the auxiliary gas supply pipeline according to the superheat of the gas supply; and / or, Obtain the gas supply saturation temperature of the static pressure air suspension system; adjust the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of the bypass solenoid valve according to the gas supply saturation temperature.

3. The method according to claim 2, characterized in that, Obtaining the superheat of the air supply in the static pressure air suspension system includes: Obtain the temperature of the gas storage tank and the gas supply temperature of the static pressure air suspension system; The gas supply superheat is calculated using the following formula: Gas supply superheat = Gas supply temperature - Gas storage tank temperature.

4. The method according to claim 2, characterized in that, Adjusting the opening of the electronic expansion valve on the auxiliary gas supply pipeline according to the aforementioned gas supply superheat includes: If the gas supply superheat is within the first superheat range, then the electronic expansion valve is controlled to periodically reduce the first preset opening degree; If the gas supply superheat is within the second superheat range, the electronic expansion valve is controlled to periodically decrease the second preset opening degree; wherein, the first preset opening degree is greater than the second preset opening degree; If the gas supply superheat is in the third superheat range, the electronic expansion valve is controlled to resume automatic control; wherein, the range from the first superheat range to the third superheat range is divided according to the increasing trend of superheat.

5. The method according to claim 2, characterized in that, Obtaining the air supply saturation temperature of the static pressure air suspension system includes: Obtain the air supply pressure of the static pressure air suspension system; convert the air supply pressure into the air supply saturation temperature; or... Obtain the pressure of the gas storage tank in the static pressure air suspension system; convert the pressure of the gas storage tank into the saturation temperature of the gas storage tank, and use the saturation temperature of the gas storage tank as the gas supply saturation temperature.

6. The method according to claim 5, characterized in that, Adjusting the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of the bypass solenoid valve according to the gas supply saturation temperature includes: Calculate the temperature difference between the gas supply saturation temperature and the target gas supply temperature; If the temperature difference is within the first temperature difference range, the opening of the electronic expansion valve is periodically increased to a third preset opening, and the bypass solenoid valve is closed. If the temperature difference is within the second temperature difference range, the opening of the electronic expansion valve is controlled to maintain the current opening, and the bypass solenoid valve is controlled to close. If the temperature difference is within the third temperature difference range, the opening of the electronic expansion valve is controlled to periodically decrease to a third preset opening, and the bypass solenoid valve is controlled to close. If the temperature difference is within the fourth temperature difference range, the opening of the electronic expansion valve is controlled to periodically decrease to the fourth preset opening, and the bypass solenoid valve is controlled to close. If the temperature difference is within the fifth temperature difference range, the opening of the electronic expansion valve is reduced to zero, and the bypass solenoid valve is opened. The first temperature difference interval to the fifth temperature difference interval are divided according to the decreasing temperature trend.

7. A control device for a static pressure air suspension system, used to implement the control method for the static pressure air suspension system according to any one of claims 2 to 6, characterized in that, The device includes: The first control module is used to acquire the superheat of the gas supply to the static pressure air suspension system; adjust the opening of the electronic expansion valve on the auxiliary gas supply pipeline according to the superheat of the gas supply; and / or, The second control module is used to obtain the gas supply saturation temperature of the static pressure air suspension system; and to adjust the opening degree of the electronic expansion valve on the auxiliary gas supply pipeline and the opening and closing of the bypass solenoid valve according to the gas supply saturation temperature.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 2 to 6.

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