CN215860664U - Overheating control enhancement system for compressor in high-temperature area - Google Patents
Overheating control enhancement system for compressor in high-temperature area Download PDFInfo
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- CN215860664U CN215860664U CN202121805103.7U CN202121805103U CN215860664U CN 215860664 U CN215860664 U CN 215860664U CN 202121805103 U CN202121805103 U CN 202121805103U CN 215860664 U CN215860664 U CN 215860664U
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Abstract
The utility model discloses a high-temperature region compressor overheating control enhancement system which comprises a main throttling element, an auxiliary control unit, an evaporator, a gas-liquid separator and a compressor, wherein the inlet end of the auxiliary throttling element is connected with the inlet end of the main throttling element in parallel, the outlet end of the auxiliary throttling element is combined with the outlet end of the evaporator and is connected to the inlet of the gas-liquid separator after being combined, the outlet of the gas-liquid separator is connected to the inlet of the compressor, and the signal output end of the auxiliary control unit is connected with the control end of the auxiliary throttling element. The utility model dynamically responds to different superheat degrees 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. The utility model 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.
Description
Technical Field
The utility model relates to the technical field of various air conditioners, liquid coolers, heat pump units and the like at high ambient temperature, in particular to a system for controlling and enhancing overheating 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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides an overheating control enhancement system for a compressor in a high-temperature area.
The utility model is realized by the following technical scheme:
the utility model provides a high temperature district compressor overheat control reinforcing system, including main throttling element, assistance control unit, evaporimeter, vapour and liquid separator and compressor, the entry end of assisting throttling element with the entry end of main throttling element is parallelly connected, the exit end of assisting throttling element with the exit end of evaporimeter merges, inserts after merging vapour and liquid separator entry, the export of vapour and liquid separator inserts the compressor entry, the signal output part of assisting control unit connect the control end of assisting throttling element, the signal input part of assisting control unit is connected with ambient temperature sensor TRing (C)An exhaust temperature sensor T is arranged at the outlet end of the compressorRow boardA temperature sensor T is arranged in the middle of the evaporatorSteaming foodAn evaporation pressure sensor P is arranged at the outlet end of the evaporatorCAnd a temperature sensor TSuction deviceThe outlet end of the evaporator and the back of the temperature sensing bulb and the outer balance tube of the main throttling element are respectively provided with a temperature sensor TC, and the environmental temperature sensor TRing (C)Exhaust gas temperature sensor TRow boardTemperature sensor TSteaming foodAnd an evaporation pressure sensor PCTemperature sensor TSuction deviceAnd the temperature sensor TC is connected with the auxiliary control unit.
The auxiliary throttling element adopts an electronic expansion valve or an electronic control valve, has the functions of shutoff and opening proportion regulation and is controlled by an auxiliary control unit.
When the evaporator is used for an air conditioner, a fin type heat exchanger is adopted; when the evaporator is used for a liquid cooling machine or a liquid cooling source, a plate heat exchanger or a shell and tube heat exchanger is adopted.
The main throttling element adopts a capillary tube or a thermal expansion valve or an electronic expansion valve.
The working principle of the utility model is as follows:
when the auxiliary control unit detects that the main throttling element cannot realize the superheat degree or the accurate control of the exhaust temperature in a high-temperature area, the auxiliary throttling element is started according to a preset control target, and the refrigerant in front of the main throttling element is directly cooled to the air suction end of the compressor in an equal-proportion liquid spraying mode to realize superheat enhancement control. The auxiliary control unit firstly determines the working range of the environment of the high-temperature area, if the environment of the high-temperature area is designed to be 50-70 ℃, the upper limit value and the lower limit value of the environment temperature are correspondingly obtained to be 70 ℃ and 50 ℃, and then the overheating of the compressor is controlled by adopting a two-point linear control method, which specifically comprises the following steps:
obtaining corresponding superheat degree value according to the upper limit value, the lower limit value and the optimized design parameters, and obtaining superheat degree T through a two-point linear equationFor treating＝f(TRing (C)) A function. For example, the superheat corresponding to an upper limit of 70 ℃ and a lower limit of 50 ℃ is 1 ℃ and 5 ℃, i.e., TFor treating＝(70－TRing (C))/5+1。
The auxiliary control unit is based on the ambient temperature TRing (C)And fitting a function, and opening the opening degree of the auxiliary throttling element in equal proportion to realize superheat degree control.
The gas-liquid separator provides further heat exchange, buffering and separation for the low-temperature unsaturated liquid sprayed by the auxiliary throttling element, and the compressor with the gas-liquid separator can be omitted.
The utility model is further illustrated as follows:
the working range of the high-temperature area of the compressor is determined according to the working environment requirements of products, the refrigerant suitable for the high-temperature area and other factors, and 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 can be an independent unit and is not controlled by the original control system, the mode is convenient to install or modify, but the mode does not exclude that when the electric control is designed, the part of functions and algorithms are embedded into a new control system to form a 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 ℃; the main throttling element is used for controlling the temperature between 35 ℃ and 50 ℃.
When the main throttling element can not realize superheat degree control in a high-temperature area, the auxiliary throttling element can be effectively and dynamically controlled, response of different superheat degrees is realized at each environment temperature, uninterrupted continuous control can be realized, and an important way for optimal control is brought.
The utility model has the advantages that: 1. the utility model dynamically responds to different superheat degrees 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 utility model 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 utility model 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.
Drawings
Fig. 1 is a schematic view of the principle of the air conditioner of the present invention.
Fig. 2 is a schematic diagram of the liquid cooling machine of the present invention.
Detailed Description
As shown in figures 1 and 2, the overheating control enhancement system of the compressor in the high-temperature area comprises a main jointFlow element 1, assist restrictive element 5, assist control unit 6, evaporimeter 2, vapour and liquid separator 3 and compressor 4, assist restrictive element 5's entry end with main restrictive element 1's entry end is parallelly connected, assist restrictive element 5's exit end with the exit end of evaporimeter 2 merges, inserts after merging vapour and liquid separator 3 entry, 3 exports of vapour and liquid separator insert compressor 4 entry, assist control unit 6's signal output part connect and assist restrictive element 5's control end, assist control unit 6's signal input part and be connected with ambient temperature sensor TRing (C)An exhaust temperature sensor T is arranged at the outlet end of the compressor 4Row boardA temperature sensor T is arranged in the middle of the evaporator 2Steaming foodAn evaporation pressure sensor P is arranged at the outlet end of the evaporator 2CAnd a temperature sensor TSuction deviceTemperature sensors TC are respectively arranged at the outlet end of the evaporator 2 and behind the temperature sensing bulb and the outer balance tube of the main throttling element, and the ambient temperature sensor TRing (C)Exhaust gas temperature sensor TRow boardTemperature sensor TSteaming foodAnd an evaporation pressure sensor PCTemperature sensor TSuction deviceAnd the temperature sensor TC are connected to the auxiliary control unit 6.
The auxiliary throttling element 5 adopts an electronic expansion valve or an electronic control valve, has the functions of closing and opening proportion adjustment and is controlled by an auxiliary control unit.
When the evaporator 2 is used for air conditioning, a finned heat exchanger is adopted; when the evaporator is used for a liquid cooling machine or a liquid cooling source, a plate heat exchanger or a shell and tube heat exchanger is adopted.
The main throttling element 1 adopts a capillary tube or a thermal expansion valve or an electronic expansion valve.
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.
Claims (5)
1. A high temperature zone compressor superheat control enhancement system, characterized by: the auxiliary throttling element is connected with the inlet end of the main throttling element in parallel, the outlet end of the auxiliary throttling element is combined with the outlet end of the evaporator and then connected into the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected into the inlet of the compressor, and the signal output end of the auxiliary control unit is connected with the control end of the auxiliary throttling element.
2. The hot zone compressor superheat control enhancement system of claim 1, wherein: the signal input end of the auxiliary control unit is connected with an environment temperature sensor TRing (C)(ii) a The outlet end of the compressor is provided with an exhaust temperature sensor TRow board(ii) a The middle part of the evaporator is provided with a temperature sensor TSteaming food(ii) a An evaporation pressure sensor P is arranged at the outlet end of the evaporatorCAnd a temperature sensor TSuction device(ii) a Temperature sensors TC are respectively arranged at the outlet end of the evaporator and behind the temperature sensing bulb and the outer balance pipe of the main throttling element; the environment temperature sensor TRing (C)Exhaust gas temperature sensor TRow boardTemperature sensor TSteaming foodAnd an evaporation pressure sensor PCTemperature sensor TSuction deviceAnd the temperature sensor TC is connected with the auxiliary control unit.
3. The hot zone compressor superheat control enhancement system of claim 1, wherein: the auxiliary throttling element adopts an electronic expansion valve or an electronic control valve.
4. The hot zone compressor superheat control enhancement system of claim 1, wherein: when the evaporator is used for an air conditioner, a fin type heat exchanger is adopted; when the evaporator is used for a liquid cooling machine or a liquid cooling source, a plate heat exchanger or a shell and tube heat exchanger is adopted.
5. The hot zone compressor superheat control enhancement system of claim 1, wherein: the main throttling element adopts a capillary tube or a thermal expansion valve or an electronic expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121805103.7U CN215860664U (en) | 2021-08-04 | 2021-08-04 | Overheating control enhancement system for compressor in high-temperature area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121805103.7U CN215860664U (en) | 2021-08-04 | 2021-08-04 | Overheating control enhancement system for compressor in high-temperature area |
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| Publication Number | Publication Date |
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| CN215860664U true CN215860664U (en) | 2022-02-18 |
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| CN202121805103.7U Active CN215860664U (en) | 2021-08-04 | 2021-08-04 | Overheating control enhancement system for compressor in high-temperature area |
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2021
- 2021-08-04 CN CN202121805103.7U patent/CN215860664U/en active Active
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