CN113530794A - High-temperature area compressor overheating control system and control method - Google Patents

High-temperature area compressor overheating control system and control method Download PDF

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Publication number
CN113530794A
CN113530794A CN202110932028.9A CN202110932028A CN113530794A CN 113530794 A CN113530794 A CN 113530794A CN 202110932028 A CN202110932028 A CN 202110932028A CN 113530794 A CN113530794 A CN 113530794A
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temperature
throttling element
superheat
compressor
ring
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CN113530794B (en
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王伟
宫玲
柴恒炜
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Hefei Swan Refrigeration Technology Co Ltd
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Hefei Swan Refrigeration Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/064—Cooling by a cooling jacket in the pump casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a system and a method for controlling overheating of a compressor in a high-temperature area, wherein the system comprises a main throttling element, an auxiliary control unit, an evaporator, a gas-liquid separator, a compressor and the like; in the method, when the auxiliary control unit detects that the main throttling element cannot realize the accurate control of superheat degree or exhaust temperature within the set working range of the high-temperature area, a control target is determined according to a two-point linear control method, and the opening degree of the auxiliary throttling element is adjusted to dynamically respond in real time, so that the defect of the main throttling element in the high-temperature area is improved and compensated, and the high-temperature area (such as 50-80 ℃) of a compressor refrigerating system can run more reliably and save energy.

Description

High-temperature area compressor overheating control system and control method
Technical Field
The invention relates to the field of compressor control systems, in particular to a system and a method for controlling overheat of a compressor in a high-temperature area.
Background
Because of the gradual rise of global temperature, the temperature in summer of individual areas is higher and higher to become a normal state, air conditioning equipment for improving indoor environment is also more and more attacked by high temperature, so that adverse factors such as high-temperature protection, high-temperature power consumption increase and the like are caused, and the safe operation of the equipment is influenced. Especially for some desert gobi high temperature areas or high temperature hot furnace and other industrial factory building operation areas, sometimes the temperature is as high as 50-80 ℃. The relevant standards also show that the high-temperature environment also has assessment requirements, such as JB/T11965-2014 air conditioners for high-environment-temperature vehicles, and the maximum environment temperature is 80 ℃; GB/T7725-; GJB/T1913A-2006 general Specification for military shelter air-conditioning equipment, with a maximum ambient temperature of 55 ℃; the maximum environmental temperature of GJB/T9168 and 2017 general Specification for military Radar circulating cooling liquid refrigerating unit is 55 ℃ and the like.
In a high-temperature environment, refrigeration equipment designed by a vapor compression refrigeration principle consumes more and more power due to the influence of a condensation load and a system high pressure, so that a compressor is in a high-load or overload working state, sometimes the exhaust temperature of the compressor is higher than 120 ℃, so that the deterioration of lubricating oil and the damage of an oil film in the compressor are caused, and the failure risk of the compressor is increased steeply. The general practice of the industry is 3, firstly, an exhaust temperature response valve is additionally arranged in a system, a fixed temperature is taken as a control target, the highest exhaust temperature of a compressor is controlled to meet the working requirement of the compressor, and the optimal control in the whole high-temperature interval cannot be realized; a bypass injection valve is additionally arranged in the system, and the highest exhaust temperature of the compressor is controlled by a fixed target temperature, which is not the same as the above; and thirdly, adjusting the superheat degree of the throttling element, wherein for a thermal expansion valve or an electronic expansion valve, the superheat degree is designed for realizing the superheat degree, and the superheat degree adjusting device has an automatic adjusting function, and has a good performance at normal temperature, but the area of an evaporator cannot be automatically reduced along with the rise of the ambient temperature, and the superheat degree of the throttling element cannot be effectively controlled, so that the exhaust temperature of the compressor exceeds the standard.
Along with the development requirement of the efficient operation under all working conditions, how to accurately control the working temperature of the compressor in the whole high-temperature area particularly realizes the energy-saving operation, and is worthy of research.
Disclosure of Invention
The invention aims to provide a system and a method for controlling the overheating of a compressor in a high-temperature area, which solve the problem that the compressor in the high-temperature area in the prior art is difficult to control accurately by utilizing a fitting function of ambient temperature and overheating degree or exhaust temperature.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high temperature zone compressor overheat control system, the compressor exit end is connected with the pipeline in order to export the refrigerant, the entrance point of compressor passes through the pipeline and communicates with vapour and liquid separator exit end, vapour and liquid separator entrance point passes through the pipeline and communicates with the exit end of evaporimeter, the entrance point of evaporimeter passes through the pipeline and is connected with main throttling element's exit end, main throttling element entrance point is connected with the pipeline in order to input the refrigerant, including assisting the control unit, assisting throttling element, a plurality of sensor, wherein:
the inlet end of the auxiliary throttling element is communicated with the pipeline at the inlet end of the main throttling element in parallel, and the outlet end of the auxiliary throttling element is communicated with the pipeline at the outlet end of the evaporator in parallel;
besides detecting the ambient temperature, the multiple sensors also realize the detection of 2 parameters, namely the detection of superheat degree and the detection of exhaust temperature, wherein the detection of superheat degree can adopt 2 modes: the superheat degree detection method 1 is characterized in that a pressure sensor is arranged on a pipeline between an outlet end of an evaporator and an inlet end of a gas-liquid separator, the pressure of an evaporation medium is detected, the temperature of saturated steam is obtained through a saturated steam pressure gauge or a curve diagram of a corresponding refrigerant, meanwhile, a temperature sensor is arranged at the outlet end of the evaporator to obtain the temperature of the superheated steam, and the superheat degree is the difference value obtained by subtracting the temperature of the saturated steam from the temperature of the superheated steam; in the mode 2 for detecting the superheat degree, a temperature sensor is respectively arranged at the middle part and the outlet end of the evaporator, and the superheat degree is the difference value of the superheated steam temperature at the outlet end of the evaporator minus the temperature of the middle part.
Furthermore, the auxiliary throttling element is an electronic expansion valve or an electronic control valve with the functions of closing and opening proportion adjustment, and the closing and the opening of the auxiliary throttling element are controlled by an auxiliary control unit.
Further, when being used for the air conditioner, the evaporimeter adopts the finned radiator, and when being used for cold liquid machine or liquid cooling source, the evaporimeter adopts plate heat exchanger or shell and tube heat exchanger.
Further, the main throttling element is a capillary tube, or a thermal expansion valve, or an electronic expansion valve.
The auxiliary control unit signal obtains a superheat degree linear control function T through a two-point linear equation according to a superheat degree linear control method and upper and lower limit values of ambient temperature and superheat degreeFor treating＝(TPassing through- TTo cross)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TTo crossWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isTo cross-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone; t isPassing through-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone;
the superheat value T at the lower limit value of the high-temperature area environmentTo crossThe superheat degree value T is larger than the upper limit value of the high-temperature area environmentPassing throughAnd the two values are not less than zero, so as to control the power of the compressor and prevent liquid impact;
the auxiliary control unit obtains a superheat target value needing to be controlled in real time through a formula according to the detected ambient temperature, real-time comparison is carried out on the superheat target value and the actual superheat obtained through the sensor, then the opening degree of the auxiliary throttling element is opened in an equal proportion, the auxiliary throttling element enables the refrigerant in front of the inlet end of the main throttling element to be cooled to the inlet end of the compressor in an equal proportion in a liquid spraying mode, and therefore control of the superheat degree is achieved.
Furthermore, the auxiliary control unit signal obtains an exhaust temperature linear control function T through a two-point linear equation according to an exhaust temperature linear control method and upper and lower limit values of the ambient temperature and the exhaust temperatureRow board＝(TOn row- TIs arranged at the lower part)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TIs arranged at the lower partWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isOn row-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone; t isIs arranged at the lower part-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone;
the auxiliary control unit obtains a real-time exhaust temperature target value to be controlled according to the detected ambient temperature, compares the real-time exhaust temperature with the actual exhaust temperature obtained by the sensor in real time, and then opens the opening of the auxiliary throttling element in an equal proportion to ensure that the auxiliary throttling element sprays and cools the refrigerant in front of the inlet end of the main throttling element to the inlet end of the compressor in an equal proportion, so that the control of the exhaust temperature is realized, the superheat degree is controlled substantially and equivalently by controlling the exhaust temperature, and the overheat protection of the compressor is prevented.
Compared with the prior art, the invention has the advantages that:
1. the invention dynamically responds to different superheat degrees or exhaust temperatures in a high-temperature area according to different environmental temperatures so as to improve and make up the defects of the original throttling element and ensure that the high-temperature operation of the system is more stable.
2. The invention reduces the power consumption of a high-temperature area by effectively controlling the suction and exhaust temperatures of the compressor and realizes that the energy saving of the compressor part exceeds 10 percent.
3. The invention can be conveniently grafted to various products such as air conditioners, liquid coolers, heat pump units and the like at high ambient temperature, and has strong popularization.
4. The invention has clear flow, simple function and easy realization.
Drawings
Fig. 1 is a schematic diagram of the structure of the system of the present invention when it is used for air conditioning.
Fig. 2 is a schematic diagram of the structure of the system of the invention when the system is used in a liquid cooling machine or a liquid cooling source.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 and 2, in the overheat control system for the compressor in the high temperature region according to the present invention, an outlet end of the compressor 4 is connected to a pipeline to output the refrigerant, an inlet end of the compressor 4 is communicated with an outlet end of the gas-liquid separator 3 through a pipeline, an inlet end of the gas-liquid separator 3 is communicated with an outlet end of the evaporator 2 through a pipeline, an inlet end of the evaporator 2 is connected to an outlet end of the main throttling element 1 through a pipeline, and an inlet end of the main throttling element 1 is connected to a pipeline to input the refrigerant. When the invention is used for an air conditioner, the evaporator 2 adopts a finned radiator, and when the invention is used for a liquid cooling machine or a liquid cooling source, the evaporator 2 adopts a plate heat exchanger or a shell-and-tube heat exchanger. The main throttling element 1 is a capillary tube, or a thermal expansion valve, or an electronic expansion valve.
The invention comprises an auxiliary control unit 5, an auxiliary throttling element 6 and a plurality of sensors, wherein the auxiliary throttling element 6 is an electronic expansion valve or an electronic control valve with the functions of closing and opening proportion regulation, and the auxiliary control unit controls the closing and opening of the auxiliary throttling element. Wherein:
the inlet end of the auxiliary throttling element 5 is communicated with the pipeline at the inlet end of the main throttling element 1 in parallel, and the outlet end of the auxiliary throttling element 5 is communicated with the pipeline at the outlet end of the evaporator 2 in parallel;
besides detecting the ambient temperature, the multiple sensors also realize the detection of 2 parameters, namely the detection of superheat degree and the detection of exhaust temperature, wherein the detection of superheat degree can adopt 2 modes: the superheat degree detection method 1 is characterized in that a pressure sensor is arranged on a pipeline between an outlet end of an evaporator 2 and an inlet end of a gas-liquid separator 3, the pressure of an evaporation medium is detected, the temperature of saturated steam is obtained through a saturated steam pressure gauge or a curve chart of a corresponding refrigerant, meanwhile, a temperature sensor is arranged at the outlet end of the evaporator 2 to obtain the temperature of superheated steam, and the superheat degree is the difference value obtained by subtracting the temperature of the saturated steam from the temperature of the superheated steam; in the mode 2 for detecting the degree of superheat, a temperature sensor is respectively arranged at the middle part and the outlet end of the evaporator 2, and the degree of superheat is a difference value obtained by subtracting the temperature of the middle part from the temperature of superheated steam at the outlet end of the evaporator 2.
The invention relates to a superheat control method for a compressor in a high-temperature area, wherein a signal of an auxiliary control unit 5 is used for obtaining a superheat linear control function T through a two-point linear equation according to a superheat linear control method and upper and lower limit values of ambient temperature and superheatFor treating＝(TPassing through- TTo cross)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TTo crossWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isTo cross-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone; t isPassing through-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone;
superheat value T at lower limit in high-temperature zone environmentTo crossThe superheat degree value T is larger than the upper limit value of the high-temperature area environmentPassing throughAnd both values are not less than zero, so as to control the power of the compressor 4 and prevent liquid impact;
the auxiliary control unit 5 obtains a superheat target value to be controlled in real time through a formula according to the detected ambient temperature, compares the superheat target value with an actual superheat obtained through a sensor in real time, and then opens the opening of the auxiliary throttling element 6 in an equal proportion to enable the auxiliary throttling element 6 to cool the refrigerant in front of the inlet end of the main throttling element 1 to the inlet end of the compressor 4 in an equal proportion in a spraying manner, so that the control of the superheat is realized.
The auxiliary control unit 5 signal obtains the linear control function of the exhaust temperature T through a two-point linear equation according to the linear control method of the exhaust temperature and the upper limit value and the lower limit value of the ambient temperature and the exhaust temperatureRow board＝(TOn row- TIs arranged at the lower part)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TIs arranged at the lower partWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isOn row-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone; t isIs arranged at the lower part-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone;
the auxiliary control unit 5 obtains a target value of the exhaust temperature to be controlled in real time according to the detected ambient temperature, compares the target value with the actual exhaust temperature obtained by the sensor in real time, and then opens the opening of the auxiliary throttling element 6 in an equal proportion to enable the auxiliary throttling element 6 to cool the refrigerant in front of the inlet end of the main throttling element 1 to the inlet end of the compressor 4 in an equal proportion in a spraying manner, so that the control of the exhaust temperature is realized, the superheat degree is controlled substantially and equivalently by controlling the exhaust temperature, and the overheat protection of the compressor 4 is prevented.
The invention is further illustrated as follows:
the working range of the high-temperature region of the compressor 4 is determined according to the working environment requirements of products and the refrigerant and other factors suitable for the high-temperature region, for example, when medium-high temperature type refrigerants (such as R22, R134a, R142b, R227ea, XP140 and the like) are adopted, the upper limit value is even more than 80 ℃; the lower limit is not limited to 50 deg.C depending on design requirements.
The auxiliary control unit 6 may be a separate unit, not controlled by the original control system, which is convenient for installation or modification, but it is not excluded that in the electric control design, this part of the functions and algorithms are embedded in the new control system and become part of the overall control system.
In the two-point linear control method, when the high temperature zone range is large, it is not excluded to set up the high temperature zone in sections, but the basic method is not changed.
And the superheat degree value corresponding to the lower limit value of the environment temperature of the high-temperature area is the superheat degree value under the standard working condition. If the ambient temperature under the standard working condition is 35 ℃, the superheat degree is designed to be 5 ℃; when the lower limit value of the environmental temperature of the high-temperature area is 50 ℃, the superheat degree is designed to be 5 ℃; controlled by a main throttling element at the temperature of between 35 and 50 ℃.
When the main throttling element 1 can not realize superheat degree control in a high-temperature area, effective dynamic control can be achieved through the auxiliary throttling element 5, response of different superheat degrees or exhaust temperatures is achieved at each environment temperature, continuous control can be achieved continuously, and the method is an important way for bringing optimal control.
Energy-saving comparative analysis: for example, taking the ambient temperature of 70 ℃, the condensation temperature of 85 ℃, the evaporation temperature of 20 ℃, the refrigerant R134a, the auxiliary throttling element does not work, the evaporator usually generates serious overheating, taking the degree of overheating as 20 ℃ (the return air temperature of the compressor is 40 ℃), obtaining a corresponding thermodynamic cycle diagram by a corresponding refrigerant pressure-enthalpy diagram, obtaining the theoretical exhaust temperature of the compressor as 106 ℃, and obtaining the front and rear enthalpy values of 428.5kj/kg and 465.7 kj/kg respectively, namely the enthalpy difference is 37.2 kj/kg; if the auxiliary throttling element works and the superheat degree is controlled to be 1 ℃ (the return air temperature of the compressor is 21 ℃), a corresponding thermodynamic cycle diagram is obtained through a corresponding refrigerant pressure-enthalpy diagram, the theoretical exhaust temperature of the compressor is 92 ℃, the front enthalpy and the rear enthalpy are respectively 409.6kj/kg and 442.3 kj/kg, and the enthalpy difference is 32.7 kj/kg. If the circulation volumes of the working media of the 4kW air conditioner are all 150kg/h, the theoretical power consumption of the compressor is 1550W and 1362.5W respectively, and the electricity is saved by about 12.1 percent.
The case can be known as follows: firstly, the exhaust temperature is reduced by 14 ℃, and the oil temperature of a compressor and the temperature rise of a motor in a high-temperature area are effectively controlled; secondly, the theoretical power consumption of the compressor is reduced by 12.1 percent, and the maximum running current of the compressor in the high-temperature area is effectively relieved.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.

Claims (6)

1. The utility model provides a high temperature zone compressor overheat control system, the compressor exit end is connected with the pipeline in order to export the refrigerant, and the entrance point of compressor passes through the pipeline and communicates with vapour and liquid separator exit end, and vapour and liquid separator entrance point passes through the pipeline and communicates with the exit end of evaporimeter, and the entrance point of evaporimeter passes through the pipeline and is connected with main throttling element's exit end, and main throttling element entrance point is connected with the pipeline in order to input the refrigerant, its characterized in that, including assisting the control unit, assisting throttling element, a plurality of sensor, wherein:
the inlet end of the auxiliary throttling element is communicated with the pipeline at the inlet end of the main throttling element in parallel, and the outlet end of the auxiliary throttling element is communicated with the pipeline at the outlet end of the evaporator in parallel;
besides detecting the ambient temperature, the multiple sensors also realize the detection of 2 parameters, namely the detection of superheat degree and the detection of exhaust temperature, wherein the detection of superheat degree can adopt 2 modes: the superheat degree detection method 1 is characterized in that a pressure sensor is arranged on a pipeline between an outlet end of an evaporator and an inlet end of a gas-liquid separator, the pressure of an evaporation medium is detected, the temperature of saturated steam is obtained through a saturated steam pressure gauge or a curve diagram of a corresponding refrigerant, meanwhile, a temperature sensor is arranged at the outlet end of the evaporator to obtain the temperature of the superheated steam, and the superheat degree is the difference value obtained by subtracting the temperature of the saturated steam from the temperature of the superheated steam; in the mode 2 for detecting the superheat degree, a temperature sensor is respectively arranged at the middle part and the outlet end of the evaporator, and the superheat degree is the difference value of the superheated steam temperature at the outlet end of the evaporator minus the temperature of the middle part.
2. The system of claim 1, wherein the system further comprises: the auxiliary throttling element is an electronic expansion valve or an electronic control valve with the functions of closing and opening proportion adjustment, and the closing and the opening of the auxiliary throttling element are controlled by an auxiliary control unit.
3. The system of claim 1, wherein the system further comprises: when the finned evaporator is used for an air conditioner, the finned evaporator is adopted, and when the finned evaporator is used for a liquid cooling machine or a liquid cooling source, the plate heat exchanger or the shell-and-tube heat exchanger is adopted by the evaporator.
4. The system of claim 1, wherein the system further comprises: the main throttling element is a capillary tube, or a thermal expansion valve, or an electronic expansion valve.
5. A control method based on the overheat control system of the high temperature zone compressor according to any one of claims 1 to 4, wherein: the auxiliary control unit signal obtains a superheat degree linear control function T through a two-point linear equation according to a superheat degree linear control method and upper and lower limit values of ambient temperature and superheat degreeFor treating＝(TPassing through- TTo cross)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TTo crossWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isTo cross-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone; t isPassing through-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone;
the superheat value T at the lower limit value of the high-temperature area environmentTo crossThe superheat degree value T is larger than the upper limit value of the high-temperature area environmentPassing throughAnd the two values are not less than zero, so as to control the power of the compressor and prevent liquid impact;
the auxiliary control unit obtains a superheat target value needing to be controlled in real time through a formula according to the detected ambient temperature, real-time comparison is carried out on the superheat target value and the actual superheat obtained through the sensor, then the opening degree of the auxiliary throttling element is opened in an equal proportion, the auxiliary throttling element enables the refrigerant in front of the inlet end of the main throttling element to be cooled to the inlet end of the compressor in an equal proportion in a liquid spraying mode, and therefore control of the superheat degree is achieved.
6. The control method according to claim 5, characterized in that: the auxiliary control unit signal obtains an exhaust temperature linear control function T through a two-point linear equation according to an exhaust temperature linear control method and upper and lower limit values of the ambient temperature and the exhaust temperatureRow board＝(TOn row- TIs arranged at the lower part)( TRing (C)- TUnder the ring)/( TOn the ring- TUnder the ring)+ TIs arranged at the lower partWherein:
Ton the ring-means the upper environmental limit in high temperature zones, in units; t isUnder the ring-means the environmental lower limit in high temperature zone, in units; t isOn row-means the degree of superheat, in units, corresponding to an upper limit value of the environment of the high temperature zone; t isIs arranged at the lower part-means the degree of superheat, in units, corresponding to a lower limit value of the environment of the high temperature zone;
the auxiliary control unit obtains a real-time exhaust temperature target value to be controlled according to the detected ambient temperature, compares the real-time exhaust temperature with the actual exhaust temperature obtained by the sensor in real time, and then opens the opening of the auxiliary throttling element in an equal proportion to ensure that the auxiliary throttling element sprays and cools the refrigerant in front of the inlet end of the main throttling element to the inlet end of the compressor in an equal proportion, so that the control of the exhaust temperature is realized, the superheat degree is controlled substantially and equivalently by controlling the exhaust temperature, and the overheat protection of the compressor is prevented.
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Citations (11)

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