Environmental test chamber with dual cooling device

Abstract

The present invention discloses an environmental test chamber with dual cooling devices, which comprises: a chamber, a first cooling device and a second cooling device, wherein the first cooling device and the second cooling device are both installed on the outside of the chamber, and the output ends of the first cooling device and the second cooling device extend into the chamber to cool down the gas environment inside the chamber; a working chamber, a first air duct and a second air duct are provided inside the chamber, the first air duct connects the two ends of the working chamber to form a first circulating cooling air duct, and the output end of the first cooling device is provided in the first air duct; the two ends of the second air duct can be connected to the first air duct, and the output end of the second cooling device is provided in the second air duct. The environmental test chamber with dual cooling devices of the present invention can use the second cooling device to operate alone to maintain a constant temperature during the high-temperature constant temperature stage, and can avoid the compressor from operating during the high-temperature constant temperature stage.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental test chambers, and in particular to an environmental test chamber with double cooling devices. Background Art

[0002] High and low temperature testing equipment primarily simulates environmental testing of products under various conditions, including low and high temperatures, to test their physical and other related properties, based on national standards or user requirements. This testing provides a preliminary assessment of whether product performance still meets predetermined requirements. It is primarily used for product design, improvement, qualification, and factory inspection. High and low temperature environmental testing chambers, on the other hand, simulate environmental testing of physical and other related properties under various conditions. During normal operation, the chamber operates according to specific high and low temperature cycles. Both the ramping and constant temperature processes typically utilize the same air duct, which houses the evaporator, heater, fan, and other devices.

[0003] Existing environmental test chambers rely on compressors for cooling throughout the entire high- and low-temperature cycle (including heating, high-temperature constant temperature, cooling, and low-temperature constant temperature). Each stage consumes a large amount of electricity, and the longer the duration, the greater the power consumption. Typically, the set temperature of an environmental test chamber during the high-temperature constant temperature stage is much higher than the ambient temperature of the environment in which the chamber is installed. Using a compressor for cooling at this time results in unnecessary energy waste for the chamber. Summary of the Invention

[0004] Based on this, it is necessary to provide an environmental test chamber with a dual cooling device to address the energy waste problem caused by the existing environmental test chamber still using a compressor for cooling when the set operating temperature is higher than the ambient temperature during the high-temperature constant temperature process.

[0005] An environmental test chamber with dual cooling devices includes a chamber, a first cooling device, and a second cooling device. The first cooling device and the second cooling device are both installed on the outside of the chamber, and the output end of the first cooling device and the output end of the second cooling device both extend into the interior of the chamber to cool the gas environment inside the chamber.

[0006] A working cavity, a first air duct and a second air duct are provided inside the box, wherein the first air duct connects the two ends of the working cavity to form a first circulating cooling air duct, and the output end of the first cooling device is provided in the first air duct; the two ends of the second air duct can be connected to the first air duct, and the output end of the second cooling device is provided in the second air duct.

[0007] In one embodiment, the first cooling device is a compression refrigeration cooling device, and the second cooling device is a water-cooled heat exchange device.

[0008] In one embodiment, the environmental test chamber with dual cooling devices further includes a heater, which is disposed in the first air duct.

[0009] In one embodiment, the heater is disposed along the first air duct at the air outlet side of the output end of the first cooling device.

[0010] In one embodiment, the environmental test chamber with dual cooling devices further includes a fan, which is disposed in the first air duct.

[0011] In one embodiment, the fan is arranged along the first air duct at the air outlet side of the heater, and the air outlet side of the fan is arranged toward the air inlet end of the working chamber.

[0012] In one embodiment, both ends of the second air duct are connected to one side of the first air duct, and the air inlet and the air outlet of the second air duct are both arranged between the output end of the first cooling device and the heater.

[0013] In one embodiment, the above-mentioned first cooling device includes a compressor, a condenser, a throttle valve and an evaporator, and the compressor, condenser, throttle valve and evaporator are connected in sequence by pipelines to form a compression refrigeration system, wherein the compressor, condenser and throttle valve are arranged outside the first air duct, and the evaporator is arranged inside the first air duct.

[0014] In one embodiment, the evaporator is disposed at one end of the first air duct connected to the air outlet of the working chamber.

[0015] In one embodiment, the above-mentioned second cooling device includes a first circulation component, a second circulation component and a plate heat exchanger, the first circulation component pipe is connected to one side of the plate heat exchanger, the second circulation component pipe is connected to the other side of the plate heat exchanger, and the output end of the second circulation component is arranged inside the second air duct.

[0016] In one embodiment, the above-mentioned first circulation component includes a condensing water tower, a filter, a first water pump and a first electric ball valve, wherein the condensing water tower, the filter, the first water pump and one end of the first electric ball valve are connected by pipes in sequence, the other end of the first electric ball valve is connected to the input end of one side of the plate heat exchanger by pipe, and the output end of one side of the plate heat exchanger is connected to the condensing water tower by pipe, thereby forming a circulation loop of the refrigerant.

[0017] In one embodiment, the above-mentioned second circulation component includes a water tank, a second electric ball valve, a second water pump, a proportional control valve and a surface cooler. The surface cooler is arranged in the second air duct. The surface cooler, the water tank and one end of the second electric ball valve are connected in sequence by pipes. The other end of the second electric ball valve is connected to the input end of one side of the plate heat exchanger by pipes. The output end of one side of the plate heat exchanger is connected to the second water pump, the proportional control valve and the surface cooler in sequence by pipes, thereby forming a circulation loop of the refrigerant.

[0018] In one embodiment, the above-mentioned second air duct is provided with a first air door and a second air door, the first air door is provided at one end of the air inlet of the second air duct, and the first air door is hinged to the inner wall of the second air duct; the second air door is provided at one end of the air outlet of the second air duct, and the second air door is hinged to the inner wall of the second air duct.

[0019] In one embodiment, the first damper is hinged to the edge of the tube wall between the first and second ducts, so that when both ends of the second duct are connected to the first duct, the first damper opens and swings into the first duct, and then closes the first duct, thereby prompting the airflow to flow from the first duct into the second duct, and after the airflow is cooled, it flows from the second duct into the first duct.

[0020] In one embodiment, the second damper is hinged to the edge of the tube wall between the first and second ducts, so that when both ends of the second duct are connected to the first duct, the second damper opens and swings into the first duct, and then closes the first duct, thereby prompting the airflow to flow from the first duct into the second duct, and after the airflow is cooled, it flows from the second duct into the first duct.

[0021] In summary, the environmental test chamber with dual cooling devices disclosed in the present invention cools down the gas environment inside the chamber by setting up a first cooling device and a second cooling device, wherein the first cooling device is a compression refrigeration cooling device and the second cooling device is a water-cooled heat exchange device. The operator switches the first circulating cooling air duct and the second circulating cooling air duct according to the actual working conditions to provide targeted cooling to the working chamber; when the environmental test chamber enters a high-temperature constant temperature state, if the set operating temperature is higher than the ambient temperature, the low-power mode of the second cooling device running alone can be enabled to maintain stability and constancy in the working chamber; when the environmental test chamber enters a cooling and low-temperature constant temperature state, depending on the external ambient temperature and the cooling rate requirements, the normal power mode of the first cooling device running alone can be used to cool down the gas environment in the working chamber at a normal rate, or the high-power mode of the first cooling device running simultaneously with the second cooling device can be used to cool down the gas environment in the working chamber at a higher rate. Therefore, the environmental test chamber with dual cooling devices of the present invention can use the low-power second cooling device to operate alone to maintain constant temperature during the high-temperature constant temperature stage. Compared with the traditional single-cooling device environmental test chamber, it can effectively avoid the compressor from running during the high-temperature constant temperature stage, thereby greatly reducing unnecessary energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of an environmental test chamber with dual cooling devices in one embodiment;

[0023] Figure 2 A schematic diagram of the structure of an environmental test chamber with dual cooling devices in one embodiment;

[0024] Figure 3 A schematic diagram of the structure of an environmental test chamber with dual cooling devices in one embodiment;

[0025] Figure 4 Schematic diagram of the structure of an environmental test chamber with dual cooling devices in one embodiment. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0032] See also Figures 1 to 4 The present invention discloses an environmental test chamber with dual cooling devices, comprising a chamber 1, a first cooling device 2, and a second cooling device 3. Both the first cooling device 2 and the second cooling device 3 are mounted on the outside of the chamber 1, and the output ends of the first cooling device 2 and the second cooling device 3 extend into the interior of the chamber 1 to cool the gas environment within the chamber 1. The first cooling device 2 is a compression refrigeration cooling device, and the second cooling device 3 is a water-cooled heat exchange device.

[0033] Specifically, a working cavity 11, a first air duct 13 and a second air duct 12 are provided inside the box body 1, wherein the first air duct 13 connects the two ends of the working cavity 11 to form a first circulating cooling air duct, and the output end of the first cooling device 2 is arranged in the first air duct 13, so as to cool down the gas environment in the first circulating cooling air duct; the two ends of the second air duct 12 can be connected with the first air duct 13, so that the second air duct 12 and the first air duct 13 are combined with the working cavity 11 to form a second circulating cooling air duct, and the output end of the second cooling device 3 is arranged in the second air duct 12, so as to realize the coordinated operation of the first cooling device 2 and the second cooling device 3. According to the actual use conditions, the environmental test box can adopt the low-power mode of the second cooling device 3 running alone, or the normal power mode of the first cooling device 2 running alone, thereby improving the flexibility of the environmental test box to cope with various working conditions and improving the economy of energy consumption.

[0034] In actual application, the operator switches the first circulating cooling air duct and the second circulating cooling air duct according to the actual working conditions to provide targeted cooling for the working chamber 11; when the environmental test chamber enters the high temperature constant temperature state, if the set operating temperature is higher than the ambient temperature, the first cooling device 2 can be turned off, the second air duct 12 can be enabled, and the second cooling device 3 can be operated alone in a low power mode to maintain a stable and constant temperature in the working chamber 11, such as Figure 2 or Figure 4 As shown; when the environmental test chamber enters the cooling and low temperature constant temperature state, according to the different external ambient temperature and cooling rate requirements, the normal power mode of the first cooling device 2 can be used to cool the gas environment in the working chamber 11 at a normal rate, such as Figure 1 or Figure 3 As shown. Thus, the environmental test chamber with dual cooling devices of the present invention can use the low-power second cooling device 3 to operate alone to maintain a constant temperature during the high-temperature constant temperature stage. Compared with the traditional environmental test chamber with a single cooling device, it can effectively avoid the compressor from operating during the high-temperature constant temperature stage, thereby greatly reducing unnecessary energy consumption.

[0035] Furthermore, the environmental test chamber with dual cooling devices also includes a heater 4, which is disposed within the first air duct 13. Specifically, heater 4 is disposed along the first air duct 13 on the outlet side of the output end of the first cooling device 2. In actual use, when the environmental test chamber enters the heating state, the high-temperature constant temperature state, and the low-temperature constant temperature state, heater 4 operates at a preset power to heat the airflow passing through the first air duct 13.

[0036] Furthermore, the environmental test chamber with dual cooling devices also includes a fan 5, which is disposed within the first air duct 13. Specifically, the fan 5 is disposed along the first air duct 13 on the outlet side of the heater 4, with the outlet side of the fan 5 facing the air inlet end of the working chamber 11. In actual use, the fan 5 operates as the environmental test chamber operates, driving the air inside the environmental test chamber to circulate along the first air duct 13 and the second air duct 12.

[0037] Furthermore, both ends of the second air duct 12 are connected to one side of the first air duct 13, and the air inlet of the second air duct 12 and the air outlet of the second air duct 12 are both arranged between the output end of the first cooling device 2 and the heater 4. When the second air duct 12 is activated, the air flow inside the environmental test chamber passes through the working cavity 11, the first air duct 13, the output end of the first cooling device 2, the second air duct 12, the output end of the second cooling device 3, the first air duct 13, the heater 4, the fan 5 in sequence and finally flows back to the working cavity 11, which is more conducive to the coordinated application between the second cooling device 3 and the heater 4.

[0038] Furthermore, the first cooling device 2 includes a compressor 21, a condenser 22, a throttle valve 23 and an evaporator 24, and the compressor 21, the condenser 22, the throttle valve 23 and the evaporator 24 are connected in sequence by pipelines to form a compression refrigeration system, wherein the compressor 21, the condenser 22 and the throttle valve 23 are arranged outside the first air duct 13, and the evaporator 24 is arranged inside the first air duct 13. Specifically, the evaporator 24 is arranged at one end of the first air duct 13 connected to the air outlet of the working cavity 11. When the environmental test chamber is in a cooling and temperature reduction state and a low-temperature constant temperature state, the airflow inside the working cavity 11 enters the first air duct 13 and is cooled at a preset rate through the evaporator 24; when the environmental test chamber is in a high-temperature constant temperature state, the first cooling device 2 is closed, the evaporator 24 stops working, and the cooling of the airflow is performed independently by the second cooling device 3.

[0039] Furthermore, the second cooling device 3 includes a first circulation component 31, a second circulation component 32, and a plate heat exchanger 33. The first circulation component 31 is connected to one side of the plate heat exchanger 33 through a pipe, and the second circulation component 32 is connected to the other side of the plate heat exchanger 33 through a pipe. In addition, the output end of the second circulation component 32 is disposed within the second air duct 12. When the second air duct 12 is activated, air flows through the second air duct 12 and is cooled by the output end of the second circulation component 32. The refrigerant in the second circulation component 32 absorbs heat and then transfers the heat to the first circulation component 31 through the plate heat exchanger 33 for cooling, thereby achieving the cooling function of the second cooling device 3.

[0040] Specifically, the first circulation assembly 31 includes a condensing water tower 311, a filter 312, a first water pump 313, and a first electric ball valve 314. One end of the condensing water tower 311, the filter 312, the first water pump 313, and the first electric ball valve 314 are sequentially connected by pipes. The other end of the first electric ball valve 314 is connected by a pipe to the input end of the plate heat exchanger 33. The output end of the plate heat exchanger 33 is connected by a pipe to the condensing water tower 311, thereby forming a refrigerant circulation loop. In actual use, driven by the first water pump 313, the refrigerant in the condensing water tower 311 flows sequentially through the filter 312, the first water pump 313, the first electric ball valve 314, the plate heat exchanger 33, and ultimately flows back to the condensing water tower 311.

[0041] Specifically, the second circulation assembly 32 includes a water tank 321, a second electric ball valve 322, a second water pump 323, a proportional control valve 324, and a surface cooler 325. The surface cooler 325 is disposed within the second air duct 12. The surface cooler 325, the water tank 321, and one end of the second electric ball valve 322 are sequentially connected by pipes. The other end of the second electric ball valve 322 is piped to the input end of the plate heat exchanger 33. The output end of the plate heat exchanger 33 is piped to the second water pump 323, the proportional control valve 324, and the surface cooler 325, thereby forming a refrigerant circulation loop. In actual use, driven by the second water pump 323, the refrigerant in the water tank 321 flows sequentially through the second electric ball valve 322, the plate heat exchanger 33, the second water pump 323, the proportional control valve 324, the surface cooler 325, and ultimately flows back to the water tank 321.

[0042] Furthermore, the second air duct 12 is provided with a first damper 131 and a second damper 132. The first damper 131 is provided at the air inlet end of the second air duct 12 and is hinged to the inner wall of the second air duct 12. The second damper 132 is provided at the air outlet end of the second air duct 12 and is hinged to the inner wall of the second air duct 12. In actual application, when the second air duct 12 is activated, the first damper 131 and the second damper 132 are respectively opened, thereby connecting the second air duct 12 with the first air duct 13, and the airflow passing through the second air duct 12 is cooled by the surface cooler 325.

[0043] In one embodiment, Figure 4 As shown, the first damper 131 is hinged to the edge of the pipe wall between the first air duct 13 and the second air duct 12, so that when the two ends of the second air duct 12 are connected to the first air duct 13, the first damper 131 opens and swings into the first air duct 13, and then closes the first air duct 13, thereby prompting the airflow to flow from the first air duct 13 into the second air duct 12. After the airflow is cooled, it flows from the second air duct 12 into the first air duct 13.

[0044] In one embodiment, Figure 2 As shown, the second air door 132 is hinged to the edge of the pipe wall between the first air duct 13 and the second air duct 12, so that when the two ends of the second air duct 12 are connected to the first air duct 13, the second air door 132 opens and swings into the first air duct 13, and then closes the first air duct 13, thereby prompting the air flow to flow from the first air duct 13 into the second air duct 12. After the air flow is cooled, it flows from the second air duct 12 into the first air duct 13.

[0045] In summary, the environmental test chamber with dual cooling devices disclosed in the present invention cools down the gas environment inside the chamber by setting up a first cooling device and a second cooling device, wherein the first cooling device is a compression refrigeration cooling device and the second cooling device is a water-cooled heat exchange device. The operator switches the first circulating cooling air duct and the second circulating cooling air duct according to the actual working conditions to provide targeted cooling to the working chamber; when the environmental test chamber enters a high-temperature constant temperature state, if the set operating temperature is higher than the ambient temperature, the low-power mode of the second cooling device running alone can be enabled to maintain stability and constancy in the working chamber; when the environmental test chamber enters a cooling and low-temperature constant temperature state, depending on the external ambient temperature and the cooling rate requirements, the normal power mode of the first cooling device running alone can be used to cool down the gas environment in the working chamber at a normal rate, or the high-power mode of the first cooling device running simultaneously with the second cooling device can be used to cool down the gas environment in the working chamber at a higher rate. Therefore, the environmental test chamber with dual cooling devices of the present invention can use the low-power second cooling device to operate alone to maintain constant temperature during the high-temperature constant temperature stage. Compared with the traditional single-cooling device environmental test chamber, it can effectively avoid the compressor from running during the high-temperature constant temperature stage, thereby greatly reducing unnecessary energy consumption.

[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An environmental test chamber with dual cooling devices, characterized in that: include: A box, a first cooling device and a second cooling device, wherein the first cooling device and the second cooling device are both installed on the outside of the box, and the output end of the first cooling device and the output end of the second cooling device extend into the inside of the box to cool the gas environment inside the box; A working cavity, a first air duct, and a second air duct are provided inside the box, wherein the first air duct communicates with both ends of the working cavity, and the output end of the first cooling device is provided in the first air duct; both ends of the second air duct can communicate with the first air duct, and the output end of the second cooling device is provided in the second air duct; The second air duct is provided with a first air door and a second air door, the first air door is provided at one end of the air inlet of the second air duct, and the first air door is hinged to the inner wall of the second air duct; the second air door is provided at one end of the air outlet of the second air duct, and the second air door is hinged to the inner wall of the second air duct; The first cooling device is a compression refrigeration cooling device, and the second cooling device is a water-cooled heat exchange device; The environmental test chamber with dual cooling devices further includes a heater, which is disposed in the first air duct; The heater is arranged along the first air duct at the air outlet side of the output end of the first cooling device; Both ends of the second air duct are connected to one side of the first air duct, and the air inlet of the second air duct and the air outlet of the second air duct are both arranged between the output end of the first cooling device and the heater; When the second air duct is activated, the first air door opens and swings into the first air duct, closing the first air duct and forcing the air flow from the first air duct to flow into the second air duct. After the air flow is cooled, it flows from the second air duct to the first air duct. The environmental test chamber has three operating modes: (a) Normal power mode in which only the first cooling device operates; (b) low power mode in which only the second cooling device operates; (c) High power mode in which the first cooling device and the second cooling device operate simultaneously.

2. The environmental test chamber with dual cooling devices according to claim 1, characterized in that: The environmental test box with dual cooling devices further includes a fan, which is disposed in the first air duct.

3. The environmental test chamber with dual cooling devices according to claim 2, characterized in that: The fan is arranged along the first air duct at an air outlet side of the heater, and the air outlet side of the fan is arranged toward an air inlet end of the working cavity.

4. The environmental test chamber with dual cooling devices according to claim 1, characterized in that: The first cooling device includes a compressor, a condenser, a throttle valve and an evaporator. The compressor, the condenser, the throttle valve and the evaporator are connected in sequence by pipelines to form a compression refrigeration system, wherein the compressor, the condenser and the throttle valve are arranged outside the first air duct, and the evaporator is arranged inside the first air duct.

5. The environmental test chamber with dual cooling devices according to claim 1, characterized in that: The second cooling device includes a first circulation component, a second circulation component and a plate heat exchanger. The first circulation component pipeline is connected to one side of the plate heat exchanger, the second circulation component pipeline is connected to the other side of the plate heat exchanger, and the output end of the second circulation component is arranged inside the second air duct.

6. The environmental test chamber with dual cooling devices according to claim 5, characterized in that: The first circulation component includes a condensing water tower, a filter, a first water pump and a first electric ball valve, wherein the condensing water tower, the filter, the first water pump and one end of the first electric ball valve are connected by pipes in sequence, the other end of the first electric ball valve is connected by a pipe to the input end of one side of the plate heat exchanger, and the output end of one side of the plate heat exchanger is connected by a pipe to the condensing water tower.

7. The environmental test chamber with dual cooling devices according to claim 5, characterized in that: The second circulation component includes a water tank, a second electric ball valve, a second water pump, a proportional control valve and a surface cooler. The surface cooler is arranged in the second air duct. The surface cooler, the water tank and one end of the second electric ball valve are connected in sequence by pipes. The other end of the second electric ball valve is connected to the input end of one side of the plate heat exchanger by a pipe. The output end of one side of the plate heat exchanger is connected to the second water pump, the proportional control valve and the surface cooler in sequence by pipes.

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