Energy-saving segmented refrigeration system suitable for ultra-large type high and low temperature test chamber

Abstract

The utility model belongs to the technical field of refrigeration, and particularly relates to an energy-saving segmented refrigeration system suitable for an ultra-large type high and low temperature test chamber. Comprising a high-temperature-stage compressor, a condenser, an auxiliary stop valve, a main stop valve, a high-temperature-stage auxiliary expansion valve, a high-temperature-stage main expansion valve, a low-temperature-stage compressor, an evaporative condenser and a low-temperature-stage expansion valve which are arranged in a refrigeration area, and a circulating fan, a high-temperature-stage evaporator and a low-temperature-stage evaporator which are arranged in a test area, the high-temperature compressor, the condenser, the auxiliary stop valve, the high-temperature auxiliary expansion valve and the high-temperature evaporator are sequentially connected in series to form a loop, and the high-temperature compressor, the condenser, the main stop valve, the high-temperature main expansion valve and the evaporative condenser are sequentially connected in series to form a loop. And the low-temperature-stage compressor, the evaporative condenser, the low-temperature-stage expansion valve and the low-temperature-stage evaporator are sequentially connected in series to form a loop. According to the utility model, through a dehumidification program, a main cooling program and a constant temperature program, the requirements of dehumidification, pre-cooling and energy consumption reduction are realized.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration technology, specifically relating to an energy-saving segmented refrigeration system suitable for ultra-large high and low temperature test chambers. Background Technology

[0002] With the continuous advancement of science and technology, high and low temperature test chambers are increasingly widely used in materials testing, electronic product verification, aerospace, and automotive industries. The working principle of a high and low temperature test chamber is to use the low-temperature stage refrigerant in a cascade refrigeration system to lower the ambient temperature to below -70°C, while the high-temperature stage refrigeration system only serves as the cold source for the low-temperature stage refrigeration system.

[0003] However, during the cooling process inside the test chamber, a large amount of frost will form on the evaporator, affecting the unit's performance. Simultaneously, when the unit's set temperature is near 0°C or during the insulation phase, the system requires less cooling capacity. Using a low-temperature refrigeration system in this situation would result in a significant waste of cooling capacity, leading to resource waste. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an energy-saving segmented refrigeration system suitable for ultra-large high and low temperature test chambers.

[0005] This utility model provides the following technical solution:

[0006] An energy-saving segmented refrigeration system suitable for an ultra-large high and low temperature test chamber, the ultra-large high and low temperature test chamber comprising a chamber body and an energy-saving segmented refrigeration system for high and low temperature environment testing, the chamber body comprising a refrigeration zone, a test zone, and a control zone, the energy-saving segmented refrigeration system for high and low temperature environment testing comprising a high-temperature stage refrigeration system and a low-temperature stage refrigeration system, the energy-saving segmented refrigeration system for high and low temperature environment testing comprising a high-temperature stage compressor, condenser, secondary shut-off valve, main shut-off valve, high-temperature stage secondary expansion valve, high-temperature stage main expansion valve, low-temperature stage compressor, evaporator-condenser and low-temperature stage expansion valve disposed in the refrigeration zone, and a circulating fan, high-temperature stage evaporator and low-temperature stage evaporator disposed in the test zone, wherein:

[0007] The high-temperature refrigeration system includes two circuits: a circuit in which the high-temperature compressor, condenser, auxiliary shut-off valve, high-temperature auxiliary expansion valve, and high-temperature evaporator are connected in series, and a circuit in which the high-temperature compressor, condenser, main shut-off valve, high-temperature main expansion valve, and evaporator-condenser are connected in series.

[0008] The cryogenic refrigeration system includes a circuit in which the cryogenic compressor, evaporator-condenser, cryogenic expansion valve, and cryogenic evaporator are connected in series.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. Dehumidification function: In the initial stage of system startup, the high-temperature refrigeration system can remove most of the water vapor inside the test area through the condensation effect of the evaporator, avoiding frost formation on the evaporator surface and affecting the refrigeration performance.

[0011] 2. Pre-cooling function: During routine cooling, the high-temperature refrigeration system is used to lower the temperature of the test area from room temperature to the working limit of the high-temperature level, and then the low-temperature refrigeration system is activated for deep cooling.

[0012] 3. Reduced energy consumption: Once the test chamber reaches its operating temperature, it enters the temperature maintenance phase. Only the high-temperature stage refrigeration system operates to compensate for the loss caused by the dissipation of cold energy in the chamber. This process also reduces the operating time of the low-temperature stage compressor, which helps to increase its service life and reduce operating energy consumption, thus achieving energy saving.

[0013] 4. When the system has low cooling demand, the high-temperature refrigeration system can operate independently, thereby enhancing the overall system control precision. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a single system of this utility model;

[0015] Figure 2 This is a schematic diagram of the cabin of this utility model;

[0016] Figure 3 This is a schematic diagram of the multi-system principle of this utility model.

[0017] Among them, 1-refrigeration zone, 101-high temperature stage compressor, 102-condenser, 103-secondary shut-off valve, 104-main shut-off valve, 105-high temperature stage secondary expansion valve, 106-high temperature stage main expansion valve, 107-low temperature stage compressor, 108-evaporator-condenser, 109-low temperature stage expansion valve, 2-test zone, 201-circulating fan, 202-high temperature stage evaporator, 203-low temperature stage evaporator, 3-control zone, 4-drain valve, 5-high temperature stage evaporator I, 6-low temperature stage evaporator I, 7-refrigeration unit. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1-3As shown, an energy-saving segmented refrigeration system suitable for an ultra-large high and low temperature test chamber is disclosed. The ultra-large high and low temperature test chamber includes a chamber body and an energy-saving segmented refrigeration system for high and low temperature environment testing. The chamber body includes a refrigeration zone 1, a test zone 2, and a control zone 3. The energy-saving segmented refrigeration system for high and low temperature environment testing includes a high-temperature stage refrigeration system and a low-temperature stage refrigeration system. The energy-saving segmented refrigeration system for high and low temperature environment testing includes a high-temperature stage compressor 101, a condenser 102, a secondary shut-off valve 103, a main shut-off valve 104, a high-temperature stage secondary expansion valve 105, a high-temperature stage main expansion valve 106, a low-temperature stage compressor 107, an evaporator-condenser 108, and a low-temperature stage expansion valve 109, all installed in the refrigeration zone 1. A circulating fan 201, a high-temperature stage evaporator 202, and a low-temperature stage evaporator 203 are also installed in the test zone 2.

[0020] The high-temperature refrigeration system includes two circuits: a circuit in which the high-temperature compressor 101, condenser 102, auxiliary shut-off valve 103, high-temperature auxiliary expansion valve 105 and high-temperature evaporator 202 are connected in series, and a circuit in which the high-temperature compressor 101, condenser 102, main shut-off valve 104, high-temperature main expansion valve 106 and evaporator-condenser 108 are connected in series.

[0021] The low-temperature refrigeration system includes a circuit in which the low-temperature compressor 107, the evaporator-condenser 108, the low-temperature expansion valve 109, and the low-temperature evaporator 203 are connected in series.

[0022] The energy-saving segmented refrigeration system applicable to ultra-large high and low temperature test chambers has an air-cooled or water-cooled condenser 102.

[0023] The energy-saving segmented refrigeration system applicable to ultra-large high and low temperature test chambers is provided with a drain valve 4 at the bottom of the test area 2.

[0024] The cooling method of the condenser 102 can be either air-cooled or water-cooled, depending on the system's cooling capacity.

[0025] The drain valve 4 is a one-way valve to prevent backflow. A pipe is connected to the drain valve 4 to divert water to the outside of the cabin.

[0026] Example 1

[0027] A control method employing the aforementioned energy-saving segmented refrigeration system suitable for ultra-large high and low temperature test chambers includes the following steps:

[0028] 1. Run the dehumidification program. The system only starts the high-temperature stage compressor 101. At the same time, the system partially opens the auxiliary shut-off valve 103, closes the main shut-off valve 104, and opens the drain valve 4 based on the dew point temperature detected by the temperature detection device in test area 2. The high-pressure gaseous refrigerant inside the system is cooled into liquid by the condenser 102, and then throttled into low-pressure liquid refrigerant by the high-temperature stage auxiliary expansion valve 105. It then enters the high-temperature stage evaporator 202, making the surface temperature of the high-temperature stage evaporator 202 lower than the dew point temperature of the air in test area 2 at this time. This causes the water vapor in test area 2 to condense on the high-temperature stage evaporator 202, and then blown off by the circulating fan 201 onto the test area floor and discharged through the drain valve 4.

[0029] 2. Run the main cooling program, which consists of two stages. In stage one, after the dehumidification program reaches the set running time, fully open the secondary shut-off valve 103, turn on the circulating fan 201, and close the drain valve 4. At this time, the high-temperature refrigeration system is fully running to cool test area 2. When the maximum capacity of the high-temperature refrigeration system is reached, the temperature in test area 2 stops decreasing, and the system starts the second stage cooling program. Close the secondary shut-off valve 103, and turn on the main shut-off valve 104 and the low-temperature compressor 107. At this time, the high-temperature and low-temperature refrigeration systems run simultaneously. The high-temperature liquid refrigerant, after being throttled by the high-temperature main expansion valve 106, cools the low-temperature refrigerant in the evaporator-condenser 108 into a liquid state. The liquid low-temperature refrigerant, after being throttled by the low-temperature expansion valve 109, enters the low-temperature evaporator 203 to vaporize and absorb heat from test area 2 until the temperature of test area 2 drops to the set value.

[0030] 3. Run the constant temperature program. When the system reaches the set temperature, shut down the low-temperature stage compressor 107 and the main shut-off valve 104, and shut down the low-temperature stage refrigeration system to prevent the temperature from dropping further. Only open the auxiliary shut-off valve 103 to maintain the temperature in test zone 2 using the cooling capacity generated by the high-temperature stage refrigeration system. At the same time, the control area will adjust the opening of the auxiliary shut-off valve 103 in real time according to the air temperature feedback in test zone 2 to ensure the accuracy of the temperature in test zone 2.

[0031] In this way, the requirements for dehumidification, precooling, and energy reduction of the test chamber are achieved.

[0032] Example 2

[0033] The test area inside the ultra-large test chamber contains multiple sets of high-temperature stage evaporators I5 and low-temperature stage evaporators I6. Each evaporator is connected in parallel with the refrigeration unit 7 in the cooling area to form a complete system. Its internal control logic is similar to that of Embodiment 1. The units can be manually and freely set in combination. When a refrigeration unit fails, the system will prompt the unit fault information. After manually setting the combination, the program will automatically call the combined units to run and start / stop.

[0034] In refrigeration systems, to prevent frost buildup on the compressor head during prolonged periods of low temperature, a constant-temperature bypass can be set up. This bypass automatically activates when the compressor return temperature is too low, ensuring that the compressor head does not frost up and extending the compressor's lifespan.

[0035] In traditional cascade refrigeration systems, the high-temperature stage refrigeration system only provides cooling capacity for the condensation of the low-temperature stage refrigerant. Therefore, both the high-temperature and low-temperature stages need to be started and run simultaneously each time. In this invention, when the system has low cooling capacity requirements, the high-temperature stage refrigeration system can operate independently, thereby enhancing the overall system control accuracy.

[0036] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. An energy-saving segmented refrigeration system suitable for ultra-large high and low temperature test chambers, characterized in that, The ultra-large high and low temperature test chamber includes a chamber body and a high and low temperature environment test energy-saving segmented refrigeration system. The chamber body includes a refrigeration zone (1), a test zone (2), and a control zone (3). The high and low temperature environment test energy-saving segmented refrigeration system includes a high-temperature stage refrigeration system and a low-temperature stage refrigeration system. The high and low temperature environment test energy-saving segmented refrigeration system includes a high-temperature stage compressor (101), a condenser (102), a secondary shut-off valve (103), a main shut-off valve (104), a high-temperature stage secondary expansion valve (105), a high-temperature stage main expansion valve (106), a low-temperature stage compressor (107), an evaporator-condenser (108), and a low-temperature stage expansion valve (109) installed in the refrigeration zone (1), and a circulating fan (201), a high-temperature stage evaporator (202), and a low-temperature stage evaporator (203) installed in the test zone (2), wherein: The high-temperature refrigeration system includes two circuits: a circuit in which the high-temperature compressor (101), condenser (102), auxiliary shut-off valve (103), high-temperature auxiliary expansion valve (105), and high-temperature evaporator (202) are connected in series, and a circuit in which the high-temperature compressor (101), condenser (102), main shut-off valve (104), high-temperature main expansion valve (106), and evaporator-condenser (108) are connected in series; The low-temperature refrigeration system includes a circuit in which the low-temperature compressor (107), evaporator-condenser (108), low-temperature expansion valve (109) and low-temperature evaporator (203) are connected in series.

2. The energy-saving segmented refrigeration system for ultra-large high and low temperature test chambers according to claim 1, characterized in that, The condenser (102) is an air-cooled or water-cooled condenser.

3. The energy-saving segmented refrigeration system for ultra-large high and low temperature test chambers according to claim 1, characterized in that, A drain valve (4) is installed at the bottom of the test area (2).

4. An ultra-large high and low temperature test chamber, characterized in that: Includes the energy-saving segmented refrigeration system of the ultra-large high and low temperature test chamber as described in any one of claims 1 to 3.

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