CN111520925B - Compressor air supply system and compressor air supply control method - Google Patents
Compressor air supply system and compressor air supply control method Download PDFInfo
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- CN111520925B CN111520925B CN202010372687.7A CN202010372687A CN111520925B CN 111520925 B CN111520925 B CN 111520925B CN 202010372687 A CN202010372687 A CN 202010372687A CN 111520925 B CN111520925 B CN 111520925B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention provides a compressor air supply system and a compressor air supply control method, the air supply system comprises a compressor, a condenser, an economizer, an evaporator, a first air supply loop and a second air supply loop, wherein the first air supply loop is connected between the output end of the condenser and the air inlet end of the compressor, the second air supply loop is connected between the exhaust end of the compressor and the air inlet end of the compressor, when the exhaust pressure of the compressor meets the air supply condition, the second air supply loop is adopted and the exhaust of the compressor supplies air to the compressor to ensure the pressure required by the work of the gas bearing, when the exhaust pressure of the compressor does not meet the air supply condition, the pressure stabilizing tank in the first air supply loop supplies air to the compressor to ensure the pressure required by the work of the gas bearing, therefore, a stable and reliable air source is provided for the static pressure gas bearing to work and the working stability of the static pressure gas bearing is ensured.
Description
Technical Field
The invention relates to the technical field of refrigeration air-conditioning equipment, in particular to a compressor air supply system and a compressor air supply control method.
Background
The oil-free technology is one of the important development directions of the centrifugal refrigeration compressor, and the centrifugal refrigeration compressor adopting the gas bearing as a supporting structure has the characteristics of oil-free performance, high speed and good stability. The adopted gas bearings can be divided into static pressure gas bearings and dynamic pressure gas bearings, and compared with the dynamic pressure gas bearings, the static pressure gas bearings have larger bearing capacity and more excellent working performance, but a stable gas source is required to supply gas to the gas bearings to ensure the stable and reliable work of the gas bearings.
Usually, the high-pressure gas discharged in the working process of the compressor can be used as a gas source, or an external gas source is used for supplying gas to the gas bearing, while the centrifugal refrigeration or heat pump unit works under the condition of a non-rated load working condition in most of the working time, namely under the condition of a partial load working condition, the maximum pressure difference of the system can be changed due to the change of evaporation pressure or condensation pressure under the working condition of the partial load, the gas supply pressure of the bearing can be insufficient at the moment, and in addition, the gas supply pressure of the system can be greatly changed under the extreme working conditions such as other high-temperature working conditions or low-temperature working conditions.
Insufficient supply pressure can result in reduced gas bearing load capacity, which can affect bearing and machine stability and reliability. The use of an external gas source adds complexity to the system and consumes excessive energy.
Therefore, providing a stable and reliable gas source for the static pressure gas bearing is one of the important key technologies of the gas bearing centrifugal compressor, and in view of the above disadvantages, how to provide a gas supply system capable of providing a stable and reliable gas source for the static pressure gas bearing for its operation and ensuring the stable operation of the static pressure gas bearing is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the technical problems to be solved by the present invention are: how to provide a gas supply system which can provide a stable and reliable gas source for the static pressure gas bearing to work and ensure the stable work of the static pressure gas bearing.
In order to achieve the above object, a first aspect of the present application provides a compressor air supply system, including a compressor, a condenser, an economizer, an evaporator, a first air supply loop and a second air supply loop, wherein the compressor, the condenser, the economizer and the evaporator are sequentially connected, the evaporator is connected to the compressor, an output end of the economizer is respectively connected to the evaporator and the compressor, and the compressor is a gas bearing supported centrifugal compressor, wherein;
the first gas supply loop is connected between the output end of the condenser and the gas inlet end of the compressor, and comprises a first one-way valve, a first control valve, a liquid supply pump, a gas supply tank, a second control valve, a pressure stabilizing tank, a gas filter, a pressure stabilizing valve and an electromagnetic valve which are sequentially connected, wherein the liquid supply pump is used for supplying liquid refrigerant into the gas supply tank, the gas supply tank is used for supplying gas to the gas inlet end of the compressor, and the gas conveyed by the gas supply tank is subjected to pressure stabilizing treatment by the pressure stabilizing tank and then is conveyed to the gas inlet end of the compressor through the gas filter and the pressure stabilizing valve so as to improve the working pressure of a gas bearing;
the second gas supply loop is connected between the exhaust end of the compressor and the gas inlet end of the compressor and comprises a second one-way valve, a second control valve, the pressure stabilizing tank, the gas filter, the pressure stabilizing valve and the electromagnetic valve which are connected in sequence, the exhaust end of the compressor is provided with a first pressure sensor to detect the exhaust pressure of the compressor, and if the exhaust pressure detected by the first pressure sensor is greater than the exhaust pressure threshold value, the second control valve is conducted to enable the gas discharged from the exhaust end of the compressor to be subjected to pressure stabilizing treatment by the pressure stabilizing tank and then to be conveyed to the gas inlet end of the compressor by the gas filter and the pressure stabilizing valve to improve the working pressure of the gas bearing.
The second aspect of the present application further provides a compressor air supply control method, which is applied to the compressor air supply system provided by the first aspect, and includes:
detecting whether the discharge pressure value of the compressor is larger than a discharge pressure threshold value;
if the exhaust pressure value of the compressor is larger than the exhaust pressure threshold, opening the third control valve and detecting whether the air pressure in the surge tank is larger than the pressure threshold of the surge tank;
if the air pressure in the surge tank is greater than the surge tank pressure threshold, determining whether the difference value of the detection values of the fourth pressure sensor and the fifth pressure sensor is lower than the lowest air supply pressure difference of the bearing;
if the difference value is lower than the lowest air supply pressure difference of the bearing, the electromagnetic valve is controlled to be closed, and the compressor is controlled to stop after a preset time period after the electromagnetic valve is closed;
and if the difference value is not lower than the lowest air supply pressure difference of the bearing, closing the first control valve, and supplying air from the air outlet end of the compressor to the air inlet end of the compressor.
Compared with the prior art, the invention provides a compressor air supply system and a compressor air supply control method, the air supply system comprises a compressor, a condenser, an economizer, an evaporator, a first air supply loop and a second air supply loop, wherein the first air supply loop is connected between the output end of the condenser and the air inlet end of the compressor, the first air supply loop comprises a first one-way valve, a first control valve, a liquid supply pump, an air supply tank, a second control valve, a pressure stabilizing tank, an air filter, a pressure stabilizing valve and an electromagnetic valve which are sequentially connected, the second air supply loop is connected between the exhaust end of the compressor and the air inlet end of the compressor and comprises a second one-way valve, a third control valve, a pressure stabilizing tank, an air filter, a pressure stabilizing valve and an electromagnetic valve which are sequentially connected, when the exhaust pressure of the compressor meets the air supply condition, the second air supply loop is adopted and the exhaust of the compressor supplies air to the compressor to ensure the pressure required by the work of the air bearing, when the exhaust pressure of the compressor does not meet the air supply condition, the pressure stabilizing tank in the first air supply loop supplies air to the compressor to ensure the pressure required by the work of the gas bearing, so that a stable and reliable air source is provided for the static pressure gas bearing to be used for the work of the static pressure gas bearing, and the work stability of the static pressure gas bearing is ensured.
Drawings
FIG. 1 is a system diagram of a compressor air supply system according to an embodiment of the present invention;
FIG. 2 is a logic block diagram of a compressor air supply control valve in an embodiment of the present invention;
fig. 3 is a logic block diagram of a compressor air supply control valve in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the present invention provides a compressor air supply system including a compressor 1, a condenser 2, an economizer 4, an evaporator 6, and first and second air supply circuits. The compressor 1, the condenser 2, the economizer 4 and the evaporator 6 are sequentially connected, the evaporator 6 is connected with the compressor 1, the output end of the economizer 4 is respectively connected with the evaporator 6 and the compressor 1, the compressor 1 is a gas bearing support type centrifugal compressor 1, a first throttle valve 3 is arranged between the condenser 2 and the economizer 4, and a second throttle valve 5 is arranged between the economizer 4 and the evaporator 6.
High-pressure gas from the compressor 1 is cooled into refrigerant liquid by the condenser 2, then enters the economizer 4 by the first throttling valve 3, is divided into two loops from the economizer 4, and one loop enters a flow passage position in front of an inlet of a 2-stage impeller of the centrifugal compressor from an upper outlet of the economizer for air supplement. The other path of refrigerant fluid enters the evaporator 6 after passing through the second throttling valve 5, and saturated or superheated steam from the outlet of the evaporator 6 enters the inlet of the low-pressure stage of the compressor 1 for compression.
The first air supply loop is connected between the output end of the condenser 2 and the air inlet end of the compressor 1, and comprises a first one-way valve 7, a first control valve 8, a liquid supply pump 9, an air supply tank 10, a second control valve 11, a pressure stabilizing tank 12, an air filter 13, a pressure stabilizing valve 14 and an electromagnetic valve 15 which are sequentially connected.
When the second control valve 11 is opened and conducted, the liquid supply pump 9 is used for supplying liquid refrigerant into the gas supply tank 10, the gas supply tank 10 is used for supplying gas to the gas inlet end of the compressor 1, and the gas conveyed by the gas supply tank 10 is subjected to pressure stabilization treatment by the pressure stabilization tank 12 and then is conveyed to the gas inlet end of the compressor 1 through the gas filter 13 and the pressure stabilization valve 14 so as to improve the working pressure of the gas bearing.
The first gas supply loop further comprises a second pressure sensor 22 and a liquid level sensor 31, the second pressure sensor 22 and the liquid level sensor 31 are connected to the gas supply tank 10, the second pressure sensor 22 detects the gas pressure in the gas supply tank 10, the liquid level sensor 31 detects the liquid level height of liquid refrigerant in the gas supply tank 10, and when the liquid level height detected by the liquid level sensor 31 is lower than a low liquid level threshold value, the liquid supply pump 9 starts to work to convey the liquid refrigerant into the gas supply tank 10; when the liquid level detected by the liquid level sensor 31 is higher than the high liquid level threshold, the liquid supply pump 9 stops working, and therefore the air supply tank 10 is ensured to provide a stable air source.
The third pressure sensor 23 is connected to the surge tank 12, the fourth pressure sensor 24 is connected between the surge valve 14 and the electromagnetic valve 15, the fifth pressure sensor 25 is connected to the air return end of the shell of the compressor 1, the third pressure sensor 23 detects the gas pressure in the surge tank 12, the fourth pressure sensor 24 detects the pressure value of the air inlet end of the compressor 1, and the fifth pressure sensor 25 detects the air return pressure value of the compressor 1. The difference value of the detection values of the fourth pressure sensor 24 and the fifth pressure sensor 25 is used as the detection value of the bearing air supply pressure difference, the difference value is compared with the set lowest bearing air supply pressure difference value, if the bearing air supply pressure difference is lower than the set lowest bearing air supply pressure difference value, the electromagnetic valve 15 is used as an air supply protection device, the electromagnetic valve 15 is closed to cut off an air supply system and control the compressor 1 to stop, the compressor is protected from being damaged, specifically, the compressor 1 is controlled to stop after a preset time period after the electromagnetic valve 15 is closed, and the purpose of controlling the compressor 1 to stop after the preset time period after the electromagnetic valve 15 is closed is as follows: when the difference between the values detected by the fourth pressure sensor 24 and the fifth pressure sensor 25 is lower than the minimum bearing gas supply pressure difference, part of the low-pressure gas is still delivered to the gas bearing in the compressor 1 for the operation of the gas bearing, and thus the compressor 1 and the gas bearing are protected by part of the low-pressure gas during the shutdown of the compressor 1.
An electric heater 19 is provided in the gas supply tank 10, and the electric heater 19 is used to heat the gas supply tank 10 to increase the gas pressure in the gas supply tank 10. When the second pressure sensor 22 detects that the gas pressure in the gas supply tank 10 is insufficient or the third pressure sensor 23 detects that the gas pressure in the surge tank 12 is insufficient, the electric heater 19 is controlled to work to raise the pressure values of the gas in the gas supply tank 10 and the surge tank 12, thereby ensuring that the pressure of the gas delivered by the gas bearing meets the requirement.
The second air supply loop is connected between the exhaust end of the compressor 1 and the air inlet end of the compressor 1, and comprises a second one-way valve 16, a third control valve 17, a pressure stabilizing tank 12, an air filter 13, a pressure stabilizing valve 14 and an electromagnetic valve 15 which are connected in sequence, wherein the exhaust end of the compressor 1 is provided with a first pressure sensor 21 to detect the exhaust pressure of the compressor 1, and if the exhaust pressure detected by the first pressure sensor 21 is greater than the exhaust pressure threshold value, the third control valve 17 is conducted to enable the air discharged from the exhaust end of the compressor 1 to be subjected to pressure stabilizing treatment by the pressure stabilizing tank 12 and then to be conveyed to the air inlet end of the compressor 1 by the air filter 13 and the pressure stabilizing valve 14 to improve the working pressure of the air bearing.
In order to ensure cooling of the motor of the compressor 1, a cooling circuit is provided in the lower part of the condenser 2. The cooling circuit comprises an electronic expansion valve and a first one-way valve 7, the cooling circuit is connected with the output end of a condenser 2 and the inlet end of a compressor 1, a refrigerant enters the inlet end of the compressor 1 from the output end of the condenser 2 through the first one-way valve 7 and the electronic expansion valve, refrigerant liquid enters a shell of the compressor 1 through the one-way valve 7 and the electronic expansion valve 18 to cool a stator and a rotor of a motor, and cooled refrigerant gas enters a first-stage inlet of the compressor 1.
In this embodiment, a method for controlling air supply to a compressor is also provided, and the method for controlling air supply to a compressor is applied to the air supply system of the compressor described above, please refer to fig. 1 to 3.
It is detected whether the discharge pressure value of the compressor 1 is greater than a discharge pressure threshold value, and the discharge pressure of the compressor 1 is detected by a first pressure sensor 21 provided on the discharge end of the compressor 1.
If the discharge pressure value of the compressor 1 is greater than the discharge pressure threshold value, the third control valve 17 is opened to detect whether the pressure in the surge tank 12 is greater than the pressure threshold value of the surge tank 12, and the third pressure sensor 23 detects the pressure in the surge tank 12.
If the air pressure in the surge tank 12 is greater than the pressure threshold of the surge tank 12, determining whether the difference between the detection values of the fourth pressure sensor 24 and the fifth pressure sensor 25 is lower than the minimum air supply pressure difference of the bearing;
if the difference is lower than the bearing minimum air supply pressure difference, the control solenoid valve 15 is closed, and the compressor 1 is controlled to stop after a preset time period after the control solenoid valve 15 is closed, specifically, when the difference is lower than the bearing minimum air supply pressure difference, the solenoid valve 15 is closed to maintain the pressure in the air supply tank 10 or the surge tank 13, and the compressor 1 is controlled to stop to protect the compressor 1. The purpose of controlling the compressor 1 to stop after a preset period of time after the control solenoid 15 is closed is: when the difference between the values detected by the fourth pressure sensor 24 and the fifth pressure sensor 25 is lower than the minimum bearing gas supply pressure difference, part of the low-pressure gas is still delivered to the gas bearing in the compressor 1 for the operation of the gas bearing, and thus the compressor 1 and the gas bearing are protected by part of the low-pressure gas during the shutdown of the compressor 1.
If the difference is not lower than the lowest air supply pressure difference of the bearing, the first control valve 8 is closed, air is supplied from the air outlet end of the compressor 1 to the air inlet end of the compressor 1, namely, air is supplied to the compressor from the second air supply loop to ensure the air pressure required by the work of the air bearing.
Further, it comprises: if the exhaust pressure value of the compressor 1 is not greater than the exhaust pressure threshold value, the first control valve 8 is opened, the third control valve 17 is closed, whether the air pressure in the surge tank 12 is greater than the pressure threshold value of the surge tank 12 or not is detected, and if the air pressure in the surge tank 12 is greater than the pressure threshold value of the surge tank 12, whether the difference value between the detection values of the fourth pressure sensor 24 and the fifth pressure sensor 25 is lower than the lowest air supply pressure difference of the bearing or not is determined; if the difference value is lower than the lowest air supply pressure difference of the bearing, the electromagnetic valve 15 is controlled to be closed, and the compressor 1 is stopped; if the difference is not lower than the bearing minimum air supply pressure difference, air is supplied from the air supply tank 10 to the surge tank 12 and to the air inlet side of the compressor 1, that is, through the first air supply circuit.
Further, if the air pressure in the surge tank 12 is less than or equal to the pressure threshold of the surge tank 12, the electric heater 19 is driven to operate.
Further, if the liquid level height of the liquid in the gas supply tank 10 is lower than the low liquid level threshold, the liquid supply pump 9 starts to work to supply liquid refrigerant into the gas supply tank 10; when the liquid level detected by the liquid level sensor 31 is higher than the high liquid level threshold, the liquid supply pump 9 stops working.
In summary, the present invention provides a compressor air supply system and a compressor air supply control method, the air supply system includes a compressor, a condenser, an economizer, an evaporator, a first air supply loop and a second air supply loop, wherein the first air supply loop is connected between an output end of the condenser and an air inlet end of the compressor, the first air supply loop includes a first one-way valve, a first control valve, a liquid supply pump, an air supply tank, a second control valve, a pressure stabilizing tank, an air filter, a pressure stabilizing valve and an electromagnetic valve which are connected in sequence, the second air supply loop is connected between an exhaust end of the compressor and the air inlet end of the compressor, the second air supply loop includes a second one-way valve, a second control valve, a pressure stabilizing tank, an air filter, a pressure stabilizing valve and an electromagnetic valve which are connected in sequence, when an exhaust pressure of the compressor meets an air supply condition, the second air supply loop supplies air to the compressor by exhaust of the compressor to ensure a pressure required by the operation of an air bearing, when the exhaust pressure of the compressor does not meet the air supply condition, the pressure stabilizing tank in the first air supply loop supplies air to the compressor to ensure the pressure required by the work of the gas bearing, so that a stable and reliable air source is provided for the static pressure gas bearing to be used for the work of the static pressure gas bearing, and the work stability of the static pressure gas bearing is ensured.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A compressor gas supply system is characterized by comprising a compressor, a condenser, an economizer, an evaporator, a first gas supply loop and a second gas supply loop, wherein the compressor, the condenser, the economizer and the evaporator are sequentially connected, the evaporator is connected with the compressor, the output end of the economizer is respectively connected with the evaporator and the compressor, and the compressor is a gas bearing support type centrifugal compressor, wherein the condenser is arranged in the condenser;
the first gas supply loop is connected between the output end of the condenser and the gas inlet end of the compressor, and comprises a first one-way valve, a first control valve, a liquid supply pump, a gas supply tank, a second control valve, a pressure stabilizing tank, a gas filter, a pressure stabilizing valve and an electromagnetic valve which are sequentially connected, wherein the liquid supply pump is used for supplying liquid refrigerant into the gas supply tank, the gas supply tank is used for supplying gas to the gas inlet end of the compressor, and the gas conveyed by the gas supply tank is subjected to pressure stabilizing treatment by the pressure stabilizing tank and then is conveyed to the gas inlet end of the compressor through the gas filter and the pressure stabilizing valve so as to improve the working pressure of a gas bearing;
the second gas supply loop is connected between the exhaust end of the compressor and the gas inlet end of the compressor and comprises a second one-way valve, a third control valve, the surge tank, the gas filter, the surge valve and the electromagnetic valve which are connected in sequence, the exhaust end of the compressor is provided with a first pressure sensor to detect the exhaust pressure of the compressor, and if the exhaust pressure detected by the first pressure sensor is greater than an exhaust pressure threshold value, the third control valve is conducted to ensure that the gas discharged from the exhaust end of the compressor is subjected to pressure stabilization treatment by the surge tank and then is conveyed to the gas inlet end of the compressor by the gas filter and the surge valve to improve the working pressure of a gas bearing;
the first gas supply loop further comprises a second pressure sensor and a liquid level sensor, the second pressure sensor and the liquid level sensor are connected to the gas supply tank, the second pressure sensor detects gas pressure in the gas supply tank, the liquid level sensor detects the liquid level height of liquid refrigerant in the gas supply tank, and when the liquid level height detected by the liquid level sensor is lower than a low liquid level threshold value, the liquid supply pump starts to work to convey the liquid refrigerant into the gas supply tank; when the liquid level detected by the liquid level sensor is higher than a high liquid level threshold value, the liquid supply pump stops working;
the compressor further comprises a third pressure sensor connected with the pressure stabilizing tank, a fourth pressure sensor connected between the pressure stabilizing valve and the electromagnetic valve, and a fifth pressure sensor connected with the air return end of the shell of the compressor, wherein the third pressure sensor is used for detecting the gas pressure in the pressure stabilizing tank, the fourth pressure sensor is used for detecting the pressure value of the air inlet end of the compressor, and the fifth pressure sensor is used for detecting the air return pressure value of the compressor;
an electric heater is arranged in the gas supply tank and used for heating the gas supply tank so as to improve the gas pressure in the gas supply tank.
2. The compressor air supply system of claim 1, wherein a first throttle valve is disposed between the condenser and the economizer, and a second throttle valve is disposed between the economizer and the evaporator.
3. The compressor air supply system according to claim 1, further comprising a cooling circuit, wherein the cooling circuit includes an electronic expansion valve and the first check valve, the cooling circuit is connected to the output end of the condenser and the inlet end of the compressor, a refrigerant enters the inlet end of the compressor from the output end of the condenser through the first check valve and the electronic expansion valve, and the compressor is cooled by the refrigerant.
4. A method for controlling air supply to a compressor, which is applied to the air supply system for a compressor according to any one of claims 1 to 3, comprising:
detecting whether the discharge pressure value of the compressor is larger than a discharge pressure threshold value;
if the exhaust pressure value of the compressor is larger than the exhaust pressure threshold, opening the third control valve and detecting whether the air pressure in the surge tank is larger than the pressure threshold of the surge tank;
if the air pressure in the surge tank is greater than the surge tank pressure threshold, determining whether the difference value of the detection values of the fourth pressure sensor and the fifth pressure sensor is lower than the lowest air supply pressure difference of the bearing;
if the difference value is lower than the lowest air supply pressure difference of the bearing, the electromagnetic valve is controlled to be closed, and the compressor is controlled to stop after a preset time period after the electromagnetic valve is closed;
if the difference value is not lower than the lowest air supply pressure difference of the bearing, closing the first control valve, and supplying air from the air exhaust end of the compressor to the air inlet end of the compressor; it includes: if the exhaust pressure value of the compressor is not greater than the exhaust pressure threshold, opening the first control valve, closing the third control valve, and detecting whether the air pressure in the surge tank is greater than the surge tank pressure threshold; if the air pressure in the surge tank is greater than the surge tank pressure threshold, determining whether the difference value of the detection values of the fourth pressure sensor and the fifth pressure sensor is lower than the lowest air supply pressure difference of the bearing; if the difference value is lower than the lowest air supply pressure difference of the bearing, the electromagnetic valve is controlled to be closed, and the compressor is controlled to stop after a preset time period after the electromagnetic valve is closed; if the difference value is not lower than the lowest air supply pressure difference of the bearing, the air supply tank delivers air to the pressure stabilizing tank and supplies air to the air inlet end of the compressor;
and if the air pressure in the pressure stabilizing tank is less than or equal to the pressure threshold value of the pressure stabilizing tank, driving the electric heater to work.
5. The method of controlling compressor air supply according to claim 4, including, if the level of liquid in the air supply tank is below a low level threshold, activating the liquid supply pump to supply liquid refrigerant into the air supply tank; and when the liquid level height detected by the liquid level sensor is higher than a high liquid level threshold value, the liquid supply pump stops working.
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| CN202010372687.7A CN111520925B (en) | 2020-05-06 | 2020-05-06 | Compressor air supply system and compressor air supply control method |
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