CN210466150U - High-low temperature liquid circulation precise temperature control system - Google Patents
High-low temperature liquid circulation precise temperature control system Download PDFInfo
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- CN210466150U CN210466150U CN201921061226.7U CN201921061226U CN210466150U CN 210466150 U CN210466150 U CN 210466150U CN 201921061226 U CN201921061226 U CN 201921061226U CN 210466150 U CN210466150 U CN 210466150U
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Abstract
The utility model discloses a high low temperature liquid circulation precision temperature control system, which comprises an evaporator, an input pipe communicated with the evaporator, a circulating pump and a heater arranged on the input pipe, an output pipe communicated with the evaporator, and a refrigeration cycle unit communicated with the evaporator, wherein the refrigeration cycle unit comprises a gas-liquid separator, a compressor and a condenser which are communicated with the evaporator to form a loop, and the output end of the condenser is divided into a first pipeline, a second pipeline and a third pipeline; the first pipeline is communicated with the evaporator and is provided with an electronic injection valve and a first electronic expansion valve; the second pipeline is communicated with a pipeline communicated with the evaporator and the gas-liquid separator and is provided with a second electronic expansion valve; the third pipeline is communicated with the pipeline connecting the gas-liquid separator and the compressor and is directly communicated with the inner cavity of the compressor, and the third pipeline is provided with an electromagnetic valve and a throttle valve. The utility model has the advantages of compact equipment volume, high control precision, low cost, energy conservation and the like.
Description
Technical Field
The utility model belongs to the technical field of the temperature control equipment, especially, relate to a high low temperature liquid circulation accurate temperature control system, mainly be applied to high low temperature test trade.
Background
In the experimental test industry, temperature control of a tested part is generally required within a large temperature variation range, for example, in the field of automobile part testing, a liquid circulation test with dynamic temperature variation of minus 40 ℃ to 200 ℃ is generally required.
The tested piece of the general test needs to be heated at high temperature, and higher stable temperature is maintained; however, there are some special cases, for example, when the new energy motor or the battery pack is in a high temperature stage, the tested piece is still in a heat release state, which requires a refrigeration operation at a high temperature to maintain a stable operation for a long time.
The current technical means is that cooling water circulation or air circulation is adopted in a high-temperature area to indirectly control the temperature of a medium, and the defects are that the equipment size is large, and in addition, an additional set of heat exchange system needs high cost. In addition, the temperature control in the low temperature region generally adopts an electric heating offset mode, and the defect is that the energy consumption is larger.
Therefore, it is necessary to provide a new precise temperature control system for high and low temperature liquid circulation to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a high low temperature liquid circulation accurate temperature control system, adopts and all adopts the compressor operation to carry out the mechanism of whole cooling to the medium in high temperature district and low temperature district, and can ensure the normal operating of compressor and avoid self overheated and influence work, has advantages such as equipment volume compactness, control accuracy height, cost are low, energy-conservation.
The utility model discloses a following technical scheme realizes above-mentioned purpose: a high-low temperature liquid circulation precise temperature control system comprises an evaporator, a high-temperature medium input pipe communicated with the evaporator, a circulating pump and a heater which are arranged on the high-temperature medium input pipe, a low-temperature medium output pipe communicated with the evaporator, and a refrigeration circulation unit which cools the medium in the high-temperature medium input pipe in the evaporator, wherein the refrigeration circulation unit comprises a gas-liquid separator, a compressor and a condenser which are communicated with the evaporator to form a loop, and the output end of the condenser is divided into a first pipeline, a second pipeline and a third pipeline; a refrigerant circulates in the refrigeration cycle unit;
the first pipeline is communicated with the evaporator and is provided with an electronic injection valve and a first electronic expansion valve;
the second pipeline is communicated with a pipeline for communicating the evaporator and the gas-liquid separator, and a second electronic expansion valve is arranged on the second pipeline;
the third pipeline is communicated with a pipeline communicated with the gas-liquid separator and the compressor and is directly communicated with the inner cavity of the compressor, and an electromagnetic valve and a throttle valve are arranged on the third pipeline.
Further, the throttle valve is a thermostatic expansion valve, an electronic expansion valve or a throttle capillary tube.
Furthermore, a first thermometer and a second thermometer are respectively arranged at the fluorine side inlet and outlet ends of the evaporator, and the first electronic expansion valve collects the temperatures of two temperature points of the first thermometer and the second thermometer through a superheat controller to carry out proportional control on the opening degree of the first electronic expansion valve and the second electronic expansion valve.
Further, the electronic injection valve performs proportional control on the opening of the valve through a valve analog quantity controller.
Further, the circulating pump is a high-temperature-resistant magnetic pump.
Further, a third thermometer is connected to the second electronic expansion valve; and a fourth thermometer is arranged between the gas-liquid separator and a pipeline communicated with the compressor, and the second electronic expansion valve collects the temperatures of two temperature points of the third thermometer and the fourth thermometer through a superheat controller to carry out proportional control on the opening degree of the second electronic expansion valve.
Furthermore, a fifth thermometer is arranged on a pipeline for communicating the compressor with the condenser.
Furthermore, a pressure maintaining valve is arranged between the suction pipeline and the exhaust pipeline of the compressor.
Further, an expansion tank is arranged on the high-temperature medium input pipe and located at the upstream of the circulating pump.
Furthermore, a second thermometer is arranged on the low-temperature medium output pipe.
Compared with the prior art, the utility model relates to a high low temperature liquid circulation accurate temperature control system's beneficial effect lies in: the air suction pipeline and the air suction cavity of the compressor are cooled in the high-temperature area through liquid spraying, so that the running safety of the compressor is ensured; meanwhile, the refrigerant flow is proportionally controlled, and electric heating hedging temperature control is not adopted, so that accurate temperature control can be realized, and energy is saved; the device has the advantages of compact volume, high control precision, low cost, energy conservation and the like.
Drawings
Fig. 1 is a schematic control diagram according to an embodiment of the present invention;
the figures in the drawings represent:
1, an evaporator; 2, a high-temperature medium input pipe; 3, a circulating pump; 4, a heater; 5, a low-temperature medium output pipe; 6, a gas-liquid separator; 7, a compressor; 8, a condenser; 9 a first conduit; 10 a second pipeline; 11 a third pipeline; 12 an electronic injection valve; 13 a first electronic expansion valve; 14 a second electronic expansion valve; 15 electromagnetic valve; a 16 throttle valve; 17 a pressure maintenance valve; 18 expansion tank.
Detailed Description
Example (b):
referring to fig. 1, the present embodiment is a high-low temperature liquid circulation precision temperature control system 100, which includes an evaporator 1, a high-temperature medium input pipe 2 communicated with the evaporator 1, a circulation pump 3 and a heater 4 disposed on the high-temperature medium input pipe 2, a low-temperature medium output pipe 5 communicated with the evaporator 1, and a refrigeration cycle unit (not identified in the figure) in the evaporator 1 for cooling a medium in the high-temperature medium input pipe 2, where the refrigeration cycle unit includes a gas-liquid separator 6 communicated with the evaporator 1 to form a loop, a compressor 7, and a condenser 8, and is divided into three paths, i.e., a first pipeline 9, a second pipeline 10, and a third pipeline 11, at an output end of the condenser 8; refrigerant circulates inside the refrigeration cycle unit.
The first pipeline 9 is communicated with the evaporator 1 and is provided with an electronic injection valve 12 and a first electronic expansion valve 13; through the first electronic expansion valve 13, the high-temperature and high-pressure liquid refrigerant is throttled and depressurized to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, so that conditions are created for the subsequent evaporation and heat absorption of the refrigerant; and the first electronic expansion valve 13 can control the superheat degree of the stable refrigerant in the evaporator 1, so that the over-large or over-small flow of the refrigerant is avoided, and the safety of the compressor is protected.
The second pipe 10 is communicated with a pipe for communicating the evaporator 1 and the gas-liquid separator 6, and a second electronic expansion valve 14 is provided on the second pipe 10. The second electronic expansion valve 14 can control the superheat degree of the stable refrigerant in the suction pipe section of the compressor 7, wherein the superheat degree is the difference between the ambient temperature and the suction temperature of the compressor, so as to maintain the relatively stable suction temperature of the compressor and protect the safe operation of the compressor 7 at the high medium temperature.
The third pipeline 11 is communicated with the pipeline connecting the gas-liquid separator 6 and the compressor 7 and is directly communicated with the inner cavity of the compressor 7, and the third pipeline 11 is provided with an electromagnetic valve 15 and a throttle valve 16. The throttle valve 16 can be made of a thermal expansion valve, an electronic expansion valve or a throttle capillary tube.
The evaporator 1 is provided at the fluorine side inlet end thereof with a first thermometer T1 and a second thermometer T2, respectively. The first electronic expansion valve 13 controls the opening of the valve in proportion through a superheat controller, and the superheat controller dynamically controls the opening of a stepping motor inside the first electronic expansion valve 13 by acquiring the temperatures of two temperature points of a first thermometer T1 and a second thermometer T2, calculating a difference value, and comparing the difference value with an actually set difference value.
The electronic injection valve 12 performs proportional control on the opening of the valve through a valve analog quantity controller, the valve analog quantity controller outputs an analog quantity model to the electronic injection valve 12 through calculation by acquiring the currently measured medium temperature and comparing the currently measured medium temperature with the set medium temperature, and the opening of a stepping motor in the electronic injection valve 12 is dynamically controlled.
The circulating pump 3 is a high-temperature-resistant magnetic pump, is not designed with a mechanical shaft seal, and can realize the low possibility of leakage at high temperature.
A third thermometer T3 is connected to the second electronic expansion valve 14 and is used for measuring the ambient temperature; a fourth thermometer T4 is provided between the gas-liquid separator 6 and the pipeline communicating with the compressor 7, and is used for detecting the temperature of the suction pipe section of the compressor 7. The second electronic expansion valve 14 controls the opening of the valve in proportion through a superheat controller, and the superheat controller dynamically controls the opening of a stepping motor inside the second electronic expansion valve 14 by acquiring the temperatures of two temperature points of a third thermometer T3 and a fourth thermometer T4, calculating a difference value, and comparing the difference value with an actually set difference value.
And a pipeline for communicating the compressor 7 with the condenser 8 is provided with a fifth thermometer T5 for detecting the temperature of the exhaust pipe section of the compressor 7.
A pressure maintaining valve 17 is installed between the suction line and the discharge line of the compressor 7. When the suction pressure of the compressor 7 is too low, the pressure maintaining valve 7 is automatically opened to maintain the normal suction pressure of the compressor 7, and the safety protection effect on the compressor 7 is achieved.
An expansion tank 18 is provided on the high-temperature medium inlet pipe 2 upstream of the circulation pump 3. The low-temperature medium output pipe 5 is provided with a second thermometer T6 for detecting the medium temperature in the low-temperature medium output pipe 5.
In the precise temperature control system 100 for high-low temperature liquid circulation in this embodiment, a method of performing whole-course temperature reduction on a medium by using compressor operation is adopted in both a high-temperature area and a low-temperature area, and a multipoint throttling liquid-spraying cooling design is added, when the device detects that the exhaust temperature of the compressor exceeds a set value, a refrigerant in the refrigeration cycle is used, a throttle valve is used for performing liquid-spraying cooling on a compressor air suction port, and the exhaust temperature of the compressor is controlled not to exceed a safe value, so that the unit can safely and reliably operate in the.
In addition to the use of a throttle valve for compressor protection control, this embodiment also provides separate cooling control of the compressor suction line section from the evaporation outlet to the compressor inlet. When the medium high-temperature area works, the temperature of the suction pipe section is higher, and the electronic expansion valve is adopted to independently control the temperature of the suction pipe section in the embodiment, so that compared with the control of starting and stopping of the electromagnetic valve, the control method has the advantages that the control is more stable, the impact on the compressor is smaller, and the service life of the compressor is prolonged; in addition, the proportion control has small cold and hot impact on the system, and is beneficial to the temperature control; the medium temperature is controlled by adjusting the proportion of the refrigerant flow, and the device has obvious energy-saving advantage compared with electric heating opposite-flushing temperature control.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (10)
1. The utility model provides a high low temperature liquid circulation precision temperature control system which characterized in that: the refrigeration cycle unit comprises a gas-liquid separator, a compressor and a condenser which are communicated with the evaporator to form a loop, wherein the output end of the condenser is divided into a first pipeline, a second pipeline and a third pipeline; a refrigerant circulates in the refrigeration cycle unit;
the first pipeline is communicated with the evaporator and is provided with an electronic injection valve and a first electronic expansion valve;
the second pipeline is communicated with a pipeline for communicating the evaporator and the gas-liquid separator, and a second electronic expansion valve is arranged on the second pipeline;
the third pipeline is communicated with a pipeline communicated with the gas-liquid separator and the compressor and is directly communicated with the inner cavity of the compressor, and an electromagnetic valve and a throttle valve are arranged on the third pipeline.
2. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: the throttle valve is a thermal expansion valve, an electronic expansion valve or a throttle capillary tube.
3. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: the evaporator is characterized in that a first thermometer and a second thermometer are respectively arranged at the fluorine side inlet end and the fluorine side outlet end of the evaporator, and the first electronic expansion valve collects the temperatures of two temperature points of the first thermometer and the second thermometer through a superheat controller to carry out proportional control on the opening degree of the first electronic expansion valve and the second electronic expansion valve.
4. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: and the electronic injection valve performs proportional control on the opening of the valve through a valve analog quantity controller.
5. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: the circulating pump is a high-temperature resistant magnetic pump.
6. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: the second electronic expansion valve is connected with a third thermometer; and a fourth thermometer is arranged between the gas-liquid separator and a pipeline communicated with the compressor, and the second electronic expansion valve collects the temperatures of two temperature points of the third thermometer and the fourth thermometer through a superheat controller to carry out proportional control on the opening degree of the second electronic expansion valve.
7. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: and a fifth thermometer is arranged on a pipeline for communicating the compressor with the condenser.
8. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: and a pressure maintaining valve is arranged between the air suction pipeline and the exhaust pipeline of the compressor.
9. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: and an expansion tank is arranged on the high-temperature medium input pipe and positioned at the upstream of the circulating pump.
10. The high-low temperature liquid circulation precise temperature control system according to claim 1, characterized in that: and a second thermometer is arranged on the low-temperature medium output pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921061226.7U CN210466150U (en) | 2019-07-09 | 2019-07-09 | High-low temperature liquid circulation precise temperature control system |
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| CN201921061226.7U CN210466150U (en) | 2019-07-09 | 2019-07-09 | High-low temperature liquid circulation precise temperature control system |
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| CN210466150U true CN210466150U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110209216A (en) * | 2019-07-09 | 2019-09-06 | 苏州奥德机械有限公司 | A kind of high/low temperature liquid circulation Precise Temperature Control System |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110209216A (en) * | 2019-07-09 | 2019-09-06 | 苏州奥德机械有限公司 | A kind of high/low temperature liquid circulation Precise Temperature Control System |
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Address after: Room 3 and 4, 228 Wulian Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province Patentee after: Suzhou Aode high end equipment Co.,Ltd. Address before: 215300 No.3 and 4, 228 Wulian Road, Yushan Town, Kunshan City, Suzhou City, Jiangsu Province Patentee before: SUZHOU AODE MACHINERY Co.,Ltd. |