Refrigeration system and double-layer test box

Abstract

The application discloses a refrigeration system and a double-layer test box. The refrigeration system comprises a refrigeration main circuit and a refrigeration branch circuit; the refrigeration main circuit comprises a compressor, a condenser and an evaporator; the refrigeration branch circuit comprises the compressor, a refrigeration pipeline and the evaporator; a part of refrigeration gas discharged from the compressor is transmitted to the condenser through the refrigeration main circuit, condensed into refrigeration liquid and then flows into the evaporator; the refrigeration gas discharged from the compressor is mixed with refrigeration liquid through the refrigeration branch circuit and then is transmitted to the evaporator; the refrigeration branch circuit comprises a first refrigeration branch circuit and a second refrigeration branch circuit which are arranged in parallel; when the evaporator needs more refrigeration liquid to flow in, the first refrigeration branch circuit and the second refrigeration branch circuit are controlled to transmit refrigeration gas at the same time; when the evaporator needs less refrigeration liquid to flow in, the first refrigeration branch circuit and the second refrigeration branch circuit are controlled to transmit refrigeration gas alternately. The application can guarantee the stability of the refrigeration system and avoid the waste of energy in the refrigeration system.

Description

[0001] This application is a divisional application of the invention patent entitled "A Double-Layer Refrigeration System and a Double-Layer Test Chamber", application number: 202210319904.5, with the parent application date being March 29, 2022. Technical Field

[0002] This invention relates to the field of refrigeration technology, and in particular to a refrigeration system and a double-layer test chamber. Background Technology

[0003] The test chamber is suitable for conducting reliability tests on products at different temperatures, and for verifying the performance indicators of the components and materials of related products under different temperature cycling conditions.

[0004] The test chamber requires a refrigeration system for low-temperature testing. A refrigeration system is a system that uses external energy to transfer heat from a higher-temperature substance (or environment) to a lower-temperature substance (or environment). Its working principle involves heat exchange through changes in the state of the working fluid. Existing two-chamber high and low temperature test chambers have each chamber equipped with its own refrigeration system, but these systems suffer from low stability and energy waste. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a refrigeration system and a double-layer test chamber to solve the problems of low stability and energy waste in existing refrigeration systems.

[0006] In a first aspect, an embodiment of the present invention provides a refrigeration system, which includes a main refrigeration circuit and refrigeration branch circuits;

[0007] The main refrigeration circuit includes a compressor, a condenser, and an evaporator;

[0008] The refrigeration branch includes the compressor, refrigeration pipes and evaporator arranged in series;

[0009] A portion of the first refrigerant gas discharged from the compressor is transported to the condenser through the main refrigeration circuit and condensed into refrigerant liquid, which then flows into the evaporator.

[0010] A portion of the first refrigerant gas discharged from the compressor is mixed with the refrigerant liquid through the refrigeration branch before being transported to the evaporator;

[0011] The refrigeration branch includes a first refrigeration branch and a second refrigeration branch connected in parallel; the first refrigeration branch and the second refrigeration branch simultaneously or alternately transmit the first refrigeration gas, thereby mixing the first refrigeration gas discharged from the compressor with the refrigeration liquid;

[0012] When the amount of refrigerant liquid required to flow into the evaporator is large, the first refrigeration and the second refrigeration branch are controlled to simultaneously transmit the first refrigerant gas.

[0013] When the amount of refrigerant liquid required to flow into the evaporator is small, the first refrigeration branch and the second refrigeration branch are controlled to alternately transmit the first refrigerant gas.

[0014] Optionally, the first refrigeration branch includes a first refrigeration pipe, and the second refrigeration branch includes a second refrigeration pipe;

[0015] The compressor discharges the first refrigerant gas and transmits it to the evaporator via the first refrigerant pipeline and the second refrigerant pipeline, respectively.

[0016] The first refrigeration branch also includes a first branch switch assembly disposed in the first refrigeration pipeline, the first branch switch assembly including a first solenoid valve;

[0017] The second refrigeration branch also includes a second branch switch assembly disposed in the second refrigeration pipeline, the second branch switch assembly including a second solenoid valve;

[0018] Both the first solenoid valve and the second solenoid valve are used to control the flow rate of the first refrigerant gas transmitted to the inlet of the evaporator.

[0019] Optionally, the refrigeration system further includes a main circuit switch assembly connected in series on the main refrigeration circuit;

[0020] The main circuit switch assembly includes an electronic expansion valve, which is connected in series on the refrigeration main circuit between the outlet of the condenser and the inlet of the evaporator. The electronic expansion valve is used to control the flow rate of the refrigerant.

[0021] Optionally, the refrigeration system further includes a temperature detection device connected in series on the main refrigeration circuit;

[0022] The temperature detection device includes a first temperature sensor and a second temperature sensor;

[0023] The first temperature sensor is used to detect the temperature of the compressor's exhaust port, and the second temperature sensor is used to detect the temperature of the condenser's outlet.

[0024] Optionally, the refrigeration system further includes an oil return branch and an oil separator connected in series on the oil return branch;

[0025] The oil separator is located at the exhaust port of the compressor;

[0026] The outlet of the oil separator is connected to the air inlet of the compressor via the oil return branch, and a portion of the oil in the oil separator is returned to the compressor via the oil return branch.

[0027] Optionally, the refrigeration system may further include a regulating branch;

[0028] The condenser discharges the refrigerant and transmits it to the compressor via the regulating branch; the regulating branch also includes a regulating switch assembly connected in series on the regulating branch;

[0029] The regulating switch assembly includes a liquid injection solenoid valve, which is used to control the flow of the refrigerant into the compressor.

[0030] Optionally, the refrigeration system further includes a pressure detection device connected in series on the main refrigeration line;

[0031] The pressure detection device includes a first pressure sensor and a second pressure sensor;

[0032] The first pressure sensor is used to detect the pressure at the inlet of the condenser, and the second pressure sensor is used to detect the pressure at the inlet of the compressor.

[0033] Optionally, the refrigeration system further includes a gas-liquid separator connected in series on the main refrigeration line;

[0034] The gas-liquid separation device is connected in series at the outlet of the evaporator and the inlet of the compressor. The evaporator evaporates the refrigerant liquid into a second refrigerant gas, and the gas-liquid separation device is used to separate the second refrigerant gas and the refrigerant liquid.

[0035] Optionally, the condenser has a condenser fan, which condenses the high-temperature, high-pressure refrigerant gas discharged from the compressor, i.e., the first refrigerant gas, into the refrigerant liquid.

[0036] Secondly, an embodiment of the present invention provides a double-layer test chamber, which includes a first refrigeration system and a second refrigeration system; both the first refrigeration system and the second refrigeration system include the refrigeration system described in any one of the first aspects.

[0037] This invention provides a refrigeration system comprising a main refrigeration circuit and two branch refrigeration circuits. The main refrigeration circuit includes a compressor, a condenser, and an evaporator. Each branch refrigeration circuit includes the compressor, refrigeration piping, and the evaporator. A portion of the refrigerant gas discharged from the compressor is transported through the main refrigeration circuit to the condenser, where it is condensed into refrigerant liquid and flows into the evaporator. Another portion of the refrigerant gas discharged from the compressor is mixed with the refrigerant liquid in the branch refrigeration circuits before being transported to the evaporator. When the required amount of refrigerant liquid to flow into the evaporator is large, the first and second branch refrigeration circuits are controlled to simultaneously transport the refrigerant gas. When the required amount of refrigerant liquid to flow into the evaporator is small, the first and second branch refrigeration circuits are controlled to alternately transport the refrigerant gas. By adding two branch refrigeration circuits to the main refrigeration circuit and controlling the conduction mode of the two branch refrigeration circuits according to the required amount of refrigerant liquid in the evaporator, the flow rate of the refrigerant liquid in the evaporator is increased, ensuring the stability of the refrigeration system and avoiding energy waste. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of exemplary embodiments of the present invention, the accompanying drawings used in describing the embodiments are briefly introduced below. Obviously, the accompanying drawings described are only a portion of the drawings of the embodiments to be described in this invention, and not all of the drawings. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0039] Figure 1 This is a schematic diagram of a dual-layer refrigeration system provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of another dual-layer refrigeration system provided in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a double-layer test chamber provided in an embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be fully described below with reference to the accompanying drawings in the embodiments of this invention, through specific implementation methods. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort fall within the protection scope of this invention.

[0043] This invention provides a dual-layer refrigeration system. Figure 1 This is a schematic diagram of a dual-layer refrigeration system provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the dual-layer refrigeration system 10 includes a first refrigeration system A and a second refrigeration system B. Both the first refrigeration system A and the second refrigeration system B include a main refrigeration circuit a1 and a refrigeration branch circuit a2. The first refrigeration system A and the second refrigeration system B include a compressor 100, a condenser 200, and an evaporator 300 arranged in series. The inlet 200A of the condenser is connected to the outlet 100B of the compressor, and the condenser 200 is used to liquefy the first refrigeration gas discharged by the compressor 100 into a refrigerant liquid. The inlet 300A of the evaporator is connected to the outlet 200B of the condenser, and the evaporator 300 is used to evaporate the refrigerant liquid into a second refrigeration gas. The pressure of the first refrigeration gas is higher than that of the second refrigeration gas, and the temperature of the first refrigeration gas is higher than that of the second refrigeration gas. The inlet 100A of the compressor is connected to the outlet 300B of the evaporator, and the compressor 100 is used to receive the second refrigeration gas. The refrigeration branch circuit a2 includes a compressor 100, a refrigeration pipe a2', and an evaporator 300 arranged in series. The compressor 100 transmits the discharged refrigeration gas to the evaporator 300 through the refrigeration pipe a2'.

[0044] The dual-layer refrigeration system 10 includes a first refrigeration system A and a second refrigeration system B. Temperature regulation can be achieved through both refrigeration systems. The first refrigeration system A and the second refrigeration system B are independently configured and do not interfere with each other, thus improving the refrigeration efficiency of the dual-layer refrigeration system 10. Specifically, both the first refrigeration system A and the second refrigeration system B include a main refrigeration circuit a1 and a branch refrigeration circuit a2. By adding a branch refrigeration circuit a2 to the main refrigeration circuit a1, the stability of the dual-layer refrigeration system 10 is ensured by having two circuits.

[0045] Specifically, such as Figure 1As shown, the first refrigeration system A and the second refrigeration system B in the dual-layer refrigeration system 10 have the same structure. The first refrigeration system A will be used as an example for specific explanation. The compressor 100, condenser 200, and evaporator 300 included in the main refrigeration circuit a1 regulate the temperature of the surrounding environment. Specifically, the compressor 100 is the core component of the entire refrigeration system 10. Low-temperature, low-pressure refrigerant gas enters through the compressor's inlet 100A. After being compressed internally, high-temperature, high-pressure refrigerant gas is discharged through the compressor's outlet 100B. The compressor 100 provides the circulating power for the entire refrigeration system 10. Specifically, the second refrigerant gas enters through the compressor's inlet 100A, and the first refrigerant gas is discharged through the compressor's outlet 100B. The pressure and temperature of the first refrigerant gas are higher than those of the second refrigerant gas. For example, the compressor 100 can be a ZF15KQE model; this embodiment of the invention does not limit the specific model of the compressor 100. The condenser 200 has a condensing fan, which condenses the high-temperature, high-pressure refrigerant gas discharged from the compressor 100 (i.e., the first refrigerant gas) into a refrigerant liquid, facilitating its flow in the main refrigeration circuit a1 and completing the circulation process of the refrigeration system 10. For example, the condenser 200 can be a T210130T, and the condensing fan can be a YWF4E-400S. This embodiment of the invention does not limit the specific model of the condenser 200. The refrigerant liquid flows into the evaporator 300, which evaporates the refrigerant liquid to form a low-temperature, low-pressure refrigerant gas (i.e., the second refrigerant gas). During evaporation, heat is absorbed, lowering the ambient temperature. For example, the evaporator 300 can be a T210021T. This embodiment of the invention does not limit the specific model of the evaporator 300. Optionally, the evaporator 300 can have a horizontal air outlet. Furthermore, the evaporator inlet 300A and outlet 300B can be wrapped with insulation cotton and then filled with an insulation layer to ensure uniform temperature regulation. The dual-layer refrigeration system 10 provided in this embodiment of the invention may contain more needle valves and ball valves in its first refrigeration system A and second refrigeration system B. Figure 1 As not shown in the figure, the embodiments of the present invention do not impose specific limitations on this.

[0046] Specifically, the refrigeration branch a2 includes a compressor 100, a refrigeration pipe a2', and an evaporator 300 connected in series. This allows the first refrigerant gas discharged from the compressor 100 to be transported to the inlet 300A of the evaporator 300 via the refrigeration pipe a2'. That is, a portion of the first refrigerant gas discharged from the compressor 100 can be transported to the condenser 200 via the main refrigeration branch a1 and condensed into refrigerant liquid, flowing into the evaporator 300. Another portion of the first refrigerant gas discharged from the compressor 100 can be mixed with the refrigerant liquid via the refrigeration branch a2 before being transported to the evaporator 300. By mixing the first refrigerant gas and the refrigerant liquid before flowing into the evaporator 300, the heat and cold of the refrigerant liquid before entering the evaporator 300 can be offset, increasing the flow rate of the refrigerant liquid entering the evaporator 300. By setting up refrigeration branch a2, the first refrigerant gas discharged from compressor 100 is mixed with the refrigerant liquid condensed by condenser 200, achieving heat and cold cancellation of the refrigerant and more stable and consistent transmission to evaporator 300. This also ensures that effective refrigerant liquid flows into evaporator 300, reducing energy consumption in the first refrigeration system A. The first refrigeration system A and the second refrigeration system B are configured in the same way, thus avoiding and reducing energy losses in both systems, thereby reducing the energy consumption of the dual-layer refrigeration system 10.

[0047] Optionally, filters (not shown in the figure) can be added to the first refrigeration system A and the second refrigeration system B to ensure that impurities in the refrigerant are filtered out and do not affect the subsequent operation of the evaporator 300.

[0048] In summary, the dual-layer refrigeration system provided by this invention includes a first refrigeration system and a second refrigeration system. Both the first and second refrigeration systems include a main refrigeration path and a branch refrigeration path. By simultaneously setting the main refrigeration path and the branch refrigeration path, a portion of the first refrigeration gas discharged from the compressor is transported to the condenser via the main refrigeration path to be condensed into a refrigerant liquid, which then flows into the evaporator. The other portion of the first refrigeration gas discharged from the compressor is mixed with the refrigerant liquid via the branch refrigeration path before being transported to the evaporator. That is, the first refrigeration gas and the refrigerant liquid are mixed before flowing into the evaporator. The cooling and heating properties of the refrigerant liquid cancel each other out, increasing the flow rate of the refrigerant liquid entering the evaporator, while simultaneously reducing the energy loss of the dual-layer refrigeration system.

[0049] Figure 2 This is a schematic diagram of another dual-layer refrigeration system provided in an embodiment of the present invention, for reference. Figure 2 As shown, the refrigeration branch a2 includes a first refrigeration branch a21 and a second refrigeration branch a22 connected in parallel; the first refrigeration branch a21 includes a first refrigeration pipe a21', and the second refrigeration branch a22 includes a second refrigeration pipe a22'. The compressor 100 transmits the discharged refrigerant gas to the evaporator 300 via the first refrigeration pipe a21' and the second refrigeration pipe a22' respectively.

[0050] The first refrigeration branch a21 and the second refrigeration branch a22 are configured in parallel, meaning that either the first refrigeration branch a21 or the second refrigeration main branch a22 can transfer the first refrigeration gas discharged from the compressor 100 to the inlet 300A of the evaporator. The first refrigeration branch a21 and the second refrigeration branch a22 can simultaneously or alternately transfer the first refrigeration gas, achieving mixing of the first refrigeration gas discharged from the compressor 100 with the refrigerant liquid. Specifically, when the amount of refrigerant liquid required to flow into the evaporator 300 is large, the first refrigeration branch a21 and the second refrigeration branch a22 are controlled to transfer the first refrigeration gas simultaneously; when the amount of refrigerant liquid required to flow into the evaporator 300 is small, the first refrigeration branch a21 and the second refrigeration branch a22 are controlled to alternately transfer the first refrigeration gas. By controlling the parallel refrigeration branch a2, the mixing of the first refrigeration gas and the refrigerant liquid is reliably achieved before flowing into the evaporator 300, and the hot and cold temperatures are offset, ensuring the stable and reliable operation of the refrigeration system 10. Furthermore, as... Figure 2 As shown, in the first refrigeration system A, the first refrigeration branch a21 includes a first refrigeration pipe a21', and the second refrigeration branch a22 includes a second refrigeration pipe a22'. The first refrigerant gas is transferred to the evaporator 300 through the first refrigeration pipe a21' and the second refrigeration pipe a22', where it cancels out the temperature difference with the refrigerant liquid discharged from the condenser 200, increasing the flow rate of the refrigerant liquid in the evaporator 300. The setup in the second refrigeration system B is the same as in the first refrigeration system A, and will not be described in detail here. Furthermore, when the required refrigerant liquid content flowing into the evaporator 300 is high, the required first refrigerant gas mixed with the refrigerant liquid is also high. In this case, controlling the first refrigeration pipe a21' and the second refrigeration pipe a22' to simultaneously transmit the first refrigerant gas ensures that the required refrigerant liquid content for the evaporator 300 is met. Furthermore, when the amount of refrigerant flowing into the evaporator 300 is low, the amount of the first refrigerant gas required to mix with the refrigerant is also low. In this case, the first refrigerant line a21' is controlled to conduct the first refrigerant gas, or the second refrigerant line a22' is controlled to conduct the first refrigerant gas. This embodiment of the invention does not impose specific limitations on this. The first refrigerant line a21' and the second refrigerant line a22' ensure an increase in the flow rate of the refrigerant liquid in the evaporator 300 of the first refrigeration system A and the second refrigeration system B, and avoid energy waste, that is, avoid energy waste in the dual-layer refrigeration system 10.

[0051] Continue to refer to Figure 2As shown, the first refrigeration branch a21 also includes a first branch switch assembly 410 disposed in the first refrigeration pipe a21', the first branch switch assembly 410 including a first solenoid valve 411; the second refrigeration branch a22 also includes a second branch switch assembly 420 disposed in the second refrigeration pipe a22', the second branch switch assembly 420 including a second solenoid valve 421; the first solenoid valve 411 and the second solenoid valve 421 are both used to control the flow rate of the first refrigeration gas transmitted to the inlet 300A of the evaporator.

[0052] Among them, such as Figure 2 As shown, the first refrigeration system A also includes a first branch switch assembly 410 and a second branch switch assembly 420. The first branch switch assembly 410 is located in the first refrigeration pipe a21' and is used to control the transmission of the first refrigerant gas to the evaporator inlet 300A when the first refrigeration pipe a21' is open. The second branch switch assembly 420 is located in the second refrigeration pipe a22' and is used to control the transmission of the first refrigerant gas to the evaporator inlet 300A when the second refrigeration pipe a22' is open. The second refrigeration system B has the same configuration, which will not be described in detail here.

[0053] Furthermore, the first branch switch assembly 410 includes a first solenoid valve 411, and the second branch switch assembly 420 includes a second solenoid valve 421. Specifically, the first solenoid valve 411, located in the first refrigeration pipe a21', controls the opening and closing of the first refrigeration pipe a21', and the second solenoid valve 421, located in the second refrigeration pipe a22', controls the opening and closing of the first refrigeration pipe a22'. For example, the first solenoid valve 411 and the second solenoid valve 421 can be of model FDF8A. This embodiment of the invention does not limit the specific model of the first solenoid valve 411 and the second solenoid valve 421. By setting the opening and closing of the first solenoid valve 411 and the second solenoid valve 421, the opening and closing of the refrigeration branch a2 is controlled, thereby enabling the control of the opening and closing of the first refrigeration branch a21 and the second refrigeration branch a22.

[0054] Specifically, when the required refrigerant content flowing into the evaporator 300 is high, the required amount of first refrigerant gas mixed with the refrigerant is also high. In this case, the first solenoid valve 411 is controlled to open and transmit the first refrigerant gas, and the second solenoid valve 421 is also controlled to open and transmit the first refrigerant gas. When the required refrigerant content flowing into the evaporator 300 is low, the required amount of first refrigerant gas mixed with the refrigerant is also low. In this case, the first solenoid valve 411 is controlled to open intermittently, and the first refrigerant gas is transmitted intermittently, or the second solenoid valve 421 is controlled to open intermittently, and the first refrigerant gas is transmitted intermittently. Alternatively, when the required refrigerant content flowing into the evaporator 300 is low, the duration of the intermittent flow of the first solenoid valve 411 or the second solenoid valve 421 can be controlled to further reduce the mixing of the first refrigerant gas and the refrigerant liquid. For example, the first solenoid valve 411 and the second solenoid valve 421 are opened simultaneously, that is, the first refrigerant branch a21 and the second refrigerant branch a22 simultaneously transmit the first refrigerant gas to the inlet 300A of the evaporator, thereby increasing the transmission speed and flow rate of the first refrigerant gas. The first solenoid valve 411 alternately opens and closes, and the second solenoid valve 421 alternately opens and closes. That is, the first refrigeration branch a21 alternately transmits the first refrigeration gas, and at the same time, the second refrigeration branch a22 also alternately transmits the first refrigeration gas, which can more effectively control the flow rate of the first refrigeration gas.

[0055] Continue to refer to Figure 2 As shown, the first refrigeration system A and the second refrigeration system B also include a main circuit switch assembly 430 connected in series on the main refrigeration circuit a1; the main circuit switch assembly 430 includes an electronic expansion valve 431, which is connected in series on the main refrigeration circuit a1 between the outlet 200B of the condenser and the inlet 300A of the evaporator, and the electronic expansion valve 431 is used to control the flow rate of the refrigerant.

[0056] Among them, such as Figure 2 As shown, the main circuit switch assembly 430 is installed on the main refrigeration circuit a1 of the first refrigeration system A and the second refrigeration system B. The main circuit switch assembly 430 includes an electronic expansion valve 431. Figure 2 The following explanation uses the first refrigeration system A as an example. By setting the electronic expansion valve 431, the flow rate of refrigerant into the evaporator 400 can be better controlled.

[0057] Specifically, the electronic expansion valve 431 can achieve an adjustment range of 45-200 steps, precisely controlling the flow rate of refrigerant entering the evaporator 300. This allows for accurate adjustment of the evaporation temperature of the evaporator 300, preventing excessive refrigerant inflow and significantly reducing temperature overshoot. This improves the working efficiency of the dual-layer refrigeration system 10, avoids energy waste, and achieves precise temperature control. For example, the electronic expansion valve 431 can be a UKV18D model; however, this embodiment of the invention does not limit the specific model of the main circuit switch assembly 430.

[0058] Continue to refer to Figure 2 As shown, the first refrigeration system A and the second refrigeration system B also include a temperature detection device 500 connected in series on the main refrigeration circuit a1; the temperature detection device 500 includes a first temperature sensor 510 and a second temperature sensor 520; the first temperature sensor 510 is used to detect the temperature of the compressor's exhaust port 100B, and the second temperature sensor 520 is used to detect the temperature of the condenser's outlet 200A.

[0059] Among them, such as Figure 2 As shown, in the first refrigeration system A and the second refrigeration system B, the temperature detection device 500 is connected in series on the main refrigeration circuit a1 to detect the temperature at the inlet and outlet positions of different devices on the main refrigeration circuit a1, prevent abnormal temperature conditions, facilitate the transmission of the first refrigeration gas and refrigeration liquid, and ensure the stability of the double-layer refrigeration system 10.

[0060] Specifically, the temperature detection device 500 includes a first temperature sensor 510 and a second temperature sensor 520. The first temperature sensor 510 detects the temperature of the exhaust port 100B of the compressor that discharges the first refrigerant gas, and the second temperature sensor 520 detects the temperature of the outlet 200B of the condenser that generates refrigerant. Based on the temperature information obtained by the temperature detection device 500, the flow rate of the refrigerant is controlled. For example, based on the temperature detected by the second temperature sensor 520, the opening of the electronic expansion valve 431 is adaptively adjusted to regulate the flow rate of the refrigerant. For example, the first temperature sensor 510 can be an NTC sensor and is high-temperature resistant, and the second temperature sensor 520 can also be an NTC sensor. This embodiment of the invention does not limit the specific model of the temperature detection module 500. By adding the temperature detection device 500, the dual-layer refrigeration system 10 is made safer and more reliable, and energy is saved.

[0061] Continue to refer to Figure 2 As shown, both the first refrigeration system A and the second refrigeration system B include an oil return branch a3; the first refrigeration system A and the second refrigeration system B also include an oil separator 700 connected in series on the oil return branch a3; the oil separator 700 is located at the discharge port 100B of the compressor; the outlet 700B of the oil separator is connected to the air inlet 100A of the compressor via the oil return branch a3, and a portion of the oil in the oil separator 700 is returned to the compressor 100 via the oil return branch a3.

[0062] Among them, such as Figure 2As shown, both the first refrigeration system A and the second refrigeration system B include an oil return branch a3. An oil separator 700 is installed in the oil return branch a3. The oil separator 700 separates the lubricating oil from the first refrigeration gas discharged from the compressor 100. The separated lubricating oil is then returned to the compressor 100 via the oil return branch a3, preventing the lubricating oil from flowing into the subsequent main refrigeration circuit a1 or refrigeration branch a2, and enabling the lubricating oil to be used multiple times while avoiding resource waste. For example, the oil separator 700 can be model A-WZ55824; this embodiment of the invention does not impose a specific limitation on this model.

[0063] Continue to refer to Figure 2 As shown, both the first refrigeration system A and the second refrigeration system B include a regulating branch a4; the condenser 200 transmits the discharged refrigerant to the compressor 100 via the regulating branch a4; the regulating branch a4 also includes a regulating switch assembly 440 connected in series on the regulating branch a4; the regulating switch assembly 440 includes a liquid injection solenoid valve 441, which is used to control the flow rate of the first refrigerant gas discharged by the compressor 100. The second refrigeration system B has the same configuration, which will not be described in detail here.

[0064] Furthermore, both the first refrigeration system A and the second refrigeration system B include a regulating branch a4. The liquid injection solenoid valve 441 on the regulating branch a4 can control the refrigerant flow back to the compressor 100. Specifically, based on the temperature information obtained from the first temperature sensor 510 at the compressor's discharge port 100B, the liquid injection solenoid valve 441 can adjust the temperature of the compressor's discharge port 100B by controlling the refrigerant flow back, thereby ensuring the stable and reliable operation of the compressor 100 and improving the operational stability of the refrigeration system 10.

[0065] Continue to refer to Figure 2 As shown, the first refrigeration system A and the second refrigeration system B also include a pressure detection device 600 connected in series on the main refrigeration circuit a1; the pressure detection device 600 includes a first pressure sensor 610 and a second pressure sensor 620; the first pressure sensor 610 is used to detect the pressure at the inlet 200A of the condenser, and the second pressure sensor 620 is used to detect the pressure at the inlet 100A of the compressor.

[0066] Among them, such as Figure 2 As shown, in the first refrigeration system A and the second refrigeration system B, the pressure detection device 600 is connected in series on the main refrigeration circuit a1 to detect the pressure at the inlet and outlet positions of different devices on the main refrigeration circuit a1, prevent abnormal pressure, facilitate the transmission of the first refrigeration gas and refrigeration liquid, and ensure the stability of the double-layer refrigeration system 10.

[0067] Specifically, the pressure detection device 600 includes a first pressure sensor 610 and a second pressure sensor 620. The first pressure sensor 610 detects the pressure at the condenser inlet 200A, and the second pressure sensor 620 detects the pressure at the compressor inlet 100A. Based on the pressure detected by the pressure detection device 600, the flow rate of the first refrigerant gas discharged by the compressor 100 is adaptively adjusted. For example, the first pressure sensor 610 can be of model number H20PS B2.5 / 1.8-2500, and the second pressure sensor 620 can be of model number H20PS B2.5 / -0.5-2500. This embodiment of the invention does not limit the specific model of the pressure detection device 600. By adding the pressure detection device 600, the dual-layer refrigeration system 10 is made safer and more reliable, and energy is saved.

[0068] Continue to refer to Figure 2 As shown, the first refrigeration system A and the second refrigeration system B also include a gas-liquid separation device 800 connected in series on the main refrigeration circuit a1; the gas-liquid separation device 800 is connected in series at the outlet 300B of the evaporator and the inlet 100A of the compressor, and the gas-liquid separation device 800 is used to separate the second refrigeration gas and the refrigerant.

[0069] The first refrigeration system A and the second refrigeration system B also include a gas-liquid separator 800 connected in series on the main refrigeration circuit a1. The gas-liquid separator 800 separates the refrigerant liquid and the second refrigerant gas before they are delivered to the compressor 100, ensuring that only the second refrigerant gas is delivered to the compressor 100, thus providing power for the compressor 100 to operate, and ensuring that the entire refrigeration system 10 provides stable circulating power. For example, the specification and model of the gas-liquid separator 800 can be FA-207. This embodiment of the invention does not limit the specific model of the gas-liquid separator 800.

[0070] Based on the same inventive concept, this invention also provides a double-layer test chamber. Figure 3 This is a structural schematic diagram of a double-layer test chamber provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the double-layer test chamber 1 includes the double-layer refrigeration system 10 described in any of the above embodiments. Therefore, the double-layer test chamber 1 provided by the present invention has the corresponding beneficial effects in the above embodiments, which will not be repeated here.

[0071] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A refrigeration system, characterized in that, Includes the main cooling circuit and cooling branch circuits; The main refrigeration circuit includes a compressor, a condenser, and an evaporator; The refrigeration branch includes the compressor, refrigeration pipes and evaporator arranged in series; A portion of the first refrigerant gas discharged from the compressor is transported to the condenser through the main refrigeration circuit and condensed into refrigerant liquid, which then flows into the evaporator. A portion of the first refrigerant gas discharged from the compressor is mixed with the refrigerant liquid through the refrigeration branch before being transported to the evaporator; The refrigeration branch includes a first refrigeration branch and a second refrigeration branch connected in parallel; the first refrigeration branch and the second refrigeration branch simultaneously or alternately transmit the first refrigeration gas, thereby mixing the first refrigeration gas discharged from the compressor with the refrigeration liquid; When the amount of refrigerant liquid required to flow into the evaporator is large, the first refrigeration and the second refrigeration branch are controlled to simultaneously transmit the first refrigerant gas. When the amount of refrigerant liquid required to flow into the evaporator is small, the first refrigeration branch and the second refrigeration branch are controlled to alternately transmit the first refrigerant gas.

2. The refrigeration system according to claim 1, characterized in that, The first refrigeration branch includes a first refrigeration pipe, and the second refrigeration branch includes a second refrigeration pipe; The compressor discharges the first refrigerant gas and transmits it to the evaporator via the first refrigerant pipeline and the second refrigerant pipeline, respectively. The first refrigeration branch also includes a first branch switch assembly disposed in the first refrigeration pipeline, the first branch switch assembly including a first solenoid valve; The second refrigeration branch also includes a second branch switch assembly disposed in the second refrigeration pipeline, the second branch switch assembly including a second solenoid valve; Both the first solenoid valve and the second solenoid valve are used to control the flow rate of the first refrigerant gas transmitted to the inlet of the evaporator.

3. The refrigeration system according to claim 1, characterized in that, It also includes a main circuit switch assembly connected in series on the main cooling circuit; The main circuit switch assembly includes an electronic expansion valve, which is connected in series on the refrigeration main circuit between the outlet of the condenser and the inlet of the evaporator. The electronic expansion valve is used to control the flow rate of the refrigerant.

4. The refrigeration system according to claim 1, characterized in that, It also includes a temperature detection device connected in series on the main cooling circuit; The temperature detection device includes a first temperature sensor and a second temperature sensor; The first temperature sensor is used to detect the temperature of the compressor's exhaust port, and the second temperature sensor is used to detect the temperature of the condenser's outlet.

5. The refrigeration system according to claim 1, characterized in that, It also includes a return oil branch and an oil separator connected in series on the return oil branch; The oil separator is located at the exhaust port of the compressor; The outlet of the oil separator is connected to the air inlet of the compressor via the oil return branch, and a portion of the oil in the oil separator is returned to the compressor via the oil return branch.

6. The refrigeration system according to claim 1, characterized in that, It also includes regulating branches; The condenser discharges the refrigerant and transmits it to the compressor via the regulating branch; the regulating branch also includes a regulating switch assembly connected in series on the regulating branch; The regulating switch assembly includes a liquid injection solenoid valve, which is used to control the flow of the refrigerant into the compressor.

7. The refrigeration system according to claim 1, characterized in that, It also includes a pressure detection device connected in series on the main refrigeration circuit; The pressure detection device includes a first pressure sensor and a second pressure sensor; The first pressure sensor is used to detect the pressure at the inlet of the condenser, and the second pressure sensor is used to detect the pressure at the inlet of the compressor.

8. The refrigeration system according to claim 1, characterized in that, It also includes a gas-liquid separation device connected in series on the main cooling circuit; The gas-liquid separation device is connected in series at the outlet of the evaporator and the inlet of the compressor. The evaporator evaporates the refrigerant liquid into a second refrigerant gas, and the gas-liquid separation device is used to separate the second refrigerant gas and the refrigerant liquid.

9. The refrigeration system according to claim 1, characterized in that, The condenser has a condensing fan, which condenses the high-temperature, high-pressure refrigerant gas discharged from the compressor, i.e., the first refrigerant gas, into the refrigerant liquid.

10. A double-layer test chamber, characterized in that, It includes a first refrigeration system and a second refrigeration system; both the first refrigeration system and the second refrigeration system include the refrigeration system according to any one of claims 1-9.

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