Evaporator outlet low-superheat-degree auxiliary control device and evaporator capacity testing device

Abstract

The utility model discloses an evaporator outlet low superheat degree auxiliary control device and an evaporator capacity testing device, the evaporator outlet low superheat degree auxiliary control device is provided with a sealed tank body, a heating pipe and a heat exchange coil pipe, and the temperature rise amplitude of a refrigerant flowing through the heat exchange coil pipe can be stably and precisely controlled by controlling the heating power of the heating pipe; an evaporator outlet low-superheat-degree auxiliary control device is additionally arranged behind a refrigerant inlet of a tested evaporator, so that a refrigerant which is output by the refrigerant outlet of the tested evaporator and is in an evaporator outlet low-superheat-degree state is controlled to be in a low-superheat-degree state; the evaporator outlet low-superheat-degree auxiliary control device can stably and precisely heat to a normal superheat degree state, meets the test condition that the temperature of the evaporator capacity test bench is higher than 5 DEG C, and solves the problem that the capacity test of an existing evaporator capacity test bench in the evaporator outlet low-superheat-degree state is not accurate. The test bench has the advantages of high test accuracy, low cost and capability of expanding the application range of the conventional evaporator capacity test bench.

Description

Technical Field

[0001] The utility model relates to a capacity testing device for an evaporator, in particular to an auxiliary control device for low superheat at an evaporator outlet and an evaporator capacity testing device. Background Art

[0002] Low superheat at the evaporator outlet is a crucial concept in refrigeration systems. It refers to the state in which the refrigerant temperature at the evaporator outlet is above its saturation temperature. This state has a significant impact on the efficiency and stability of the refrigeration system. Firstly, low superheat at the evaporator outlet helps prevent liquid refrigerant from entering the compressor, as this could cause a wet stroke, reducing efficiency or even damaging the equipment. Furthermore, an appropriate superheat ensures efficient heat transfer within the evaporator, preventing efficiency drops due to localized overcooling.

[0003] In practical applications, the superheat at the evaporator outlet typically needs to be maintained within an appropriate range through control measures. For example, the refrigerant flow rate can be controlled by adjusting the opening of the thermal expansion valve, thereby affecting the superheat at the evaporator outlet. Furthermore, more advanced control technologies, such as electronic expansion valves, can be used to precisely control the evaporator outlet superheat through real-time monitoring and adjustment.

[0004] In general, low superheat at the evaporator outlet is a technical parameter that requires precise control and is crucial to ensuring the performance and efficiency of the refrigeration system. Through reasonable design and control, the evaporator's heat exchange capacity can be fully utilized, improving the overall performance of the system. Therefore, for test benches used to test evaporator capacity, capacity testing under low superheat conditions is very important. However, existing test benches for evaporator capacity testing generally require that the superheat under test conditions be greater than 5 degrees, resulting in inaccurate capacity testing under low superheat conditions. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an evaporator outlet low superheat auxiliary control device and an evaporator capacity testing device.

[0006] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] An evaporator outlet low superheat auxiliary control device is characterized by comprising: a sealed tank body, a heating pipe and a heat exchange coil; the sealed tank body is filled with R123 refrigerant, the heating pipe and the heat exchange coil are both installed in the sealed tank body and immersed in the R123 refrigerant, and the heating pipe and the heat exchange coil are respectively located at the bottom and the top of the sealed tank body, and the inlet and outlet of the heat exchange coil respectively extend out of the sealed tank body.

[0008] Therefore, by utilizing the characteristic that R123 refrigerant has a lower pressure corresponding to normal saturation temperature, it is used as the secondary refrigerant to realize heat exchange between the heating tube and the refrigerant flowing through the heat exchange coil through R123 refrigerant. By controlling the heating power of the heating tube, the temperature rise of the refrigerant flowing through the heat exchange coil can be stably and accurately controlled.

[0009] Preferably, the sealed tank body is equipped with a pressure relief valve, so that when the internal pressure of the sealed tank body is greater than the rated pressure of the pressure relief valve, the pressure relief valve is opened to provide pressure relief protection.

[0010] Preferably, a pressure gauge is mounted on the top of the sealed tank, and a pressure protector is connected in series between the power supply end of the heating tube and its power source, with the pressure signal input end of the pressure protector connected to the pressure signal output end of the pressure gauge. Thus, when the pressure detected by the pressure gauge exceeds the pressure setting of the pressure protector, the pressure protector disconnects the power supply to the heating tube, thereby providing protection.

[0011] Preferably, a temperature sensor and a pressure sensor are installed at the outlet of the heat exchange coil to measure the temperature and pressure of the refrigerant respectively.

[0012] An evaporator capacity testing device includes an evaporator capacity testing test bench with an existing conventional test condition of an evaporator outlet superheat greater than 5 degrees Celsius; it is characterized in that it also includes the evaporator outlet low superheat auxiliary control device; the refrigerant outlet of the evaporator capacity testing test bench is connected to the refrigerant inlet of the evaporator under test through a flow meter, the refrigerant outlet of the evaporator under test is connected to the inlet of the heat exchange coil, and the outlet of the heat exchange coil is connected to the refrigerant inlet of the evaporator capacity testing test bench.

[0013] Therefore, the evaporator capacity testing device of the present invention is used as follows:

[0014] When conducting a capacity test on the evaporator under test in a low superheat state at the evaporator outlet, first, the temperature of the refrigerant output from its refrigerant outlet is adjusted by the evaporator capacity test bench, so that the refrigerant output from the refrigerant outlet of the evaporator under test is in a low superheat state; then, by controlling the heating power of the heating tube, the temperature of the refrigerant output from the outlet of the heat exchange coil is controlled stably and with high precision, so that the refrigerant is in a normal superheat state with a temperature greater than 5 degrees Celsius, so as to meet the test conditions of the evaporator capacity test bench; finally, the enthalpy value of the refrigerant at the outlet of the heat exchange coil under a normal superheat state is obtained by testing on the evaporator capacity test bench. Combined with the heating power of the heating tube and the flow rate of the refrigerant, the enthalpy value of the refrigerant at the refrigerant outlet of the evaporator under test in a low superheat state can be accurately converted, thereby accurately realizing the capacity test of the evaporator under test in a low superheat state at the evaporator outlet.

[0015] In summary, the evaporator capacity testing device of the present invention adds an evaporator outlet low superheat auxiliary control device behind the refrigerant inlet of the evaporator under test, so that the refrigerant in the evaporator outlet low superheat state output by the refrigerant outlet of the evaporator under test can be stably and accurately heated to a normal superheat state through the evaporator outlet low superheat auxiliary control device, and meets the test conditions of the evaporator capacity test bench greater than 5 degrees Celsius, so that the enthalpy value of the refrigerant in the normal superheat state at the outlet of the heat exchange coil can be obtained through the evaporator capacity test test, and on this basis, the existing conversion formula is used, combined with the heating power of the heating tube and the flow rate of the refrigerant, the refrigerant under the normal superheat state can be accurately converted. The enthalpy value of the refrigerant at the refrigerant outlet of the evaporator in the low superheat state of the evaporator outlet is measured, thereby accurately realizing the capacity test of the evaporator under the low superheat state of the evaporator outlet; therefore, the utility model utilizes the evaporator outlet low superheat auxiliary control device and the existing conventional test condition that the evaporator outlet superheat is greater than 5 degrees Celsius for the evaporator capacity test bench, so as to perform the capacity test of the evaporator under the low superheat state of the evaporator outlet, thereby solving the problem of inaccurate capacity test of the existing conventional evaporator capacity test bench under the low superheat state of the evaporator outlet, and has the advantages of high test accuracy, low cost, and the ability to expand the scope of application of the existing conventional evaporator capacity test bench.

[0016] Preferably, an expansion valve is connected in series to the connecting pipe between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator under test. Thus, the refrigerant flow through the evaporator under test can be controlled by adjusting the opening of the expansion valve, thereby controlling the refrigerant enthalpy at the refrigerant outlet of the evaporator under test, achieving more rapid, stable, and precise control of the evaporator outlet's low superheat state.

[0017] Preferably, a sight glass is connected in series to the connecting pipeline between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator under test, so as to observe the state of the refrigerant in the pipeline.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First, the evaporator outlet low superheat auxiliary control device of the present invention is provided with a sealed tank body 1, a heating tube 2 and a heat exchange coil 3. The R123 refrigerant has the characteristic of a lower pressure corresponding to the normal saturation temperature and is used as a secondary refrigerant to realize heat exchange between the heating tube 2 and the refrigerant flowing through the heat exchange coil 3 through the R123 refrigerant. By controlling the heating power of the heating tube 2, the temperature rise of the refrigerant flowing through the heat exchange coil 3 can be stably and accurately controlled.

[0020] Secondly, the evaporator capacity testing device of the present invention adds an evaporator outlet low superheat auxiliary control device behind the refrigerant inlet of the tested evaporator 4, so that the refrigerant in the evaporator outlet low superheat state output by the refrigerant outlet of the tested evaporator 4 can be stably and accurately heated to a normal superheat state through the evaporator outlet low superheat auxiliary control device, and meets the test conditions of the evaporator capacity test bench greater than 5 degrees Celsius, so that the refrigerant enthalpy value in the normal superheat state at the outlet 3b of the heat exchange coil 3 can be obtained through the evaporator capacity test test, and on this basis, the existing conversion formula is used, combined with the heating power of the heating tube 2 and the flow rate of the refrigerant, the refrigerant enthalpy value can be accurately converted. The enthalpy value of the refrigerant at the refrigerant outlet of the tested evaporator 4 in the low superheat state of the evaporator outlet is measured, thereby accurately realizing the capacity test of the tested evaporator 4 in the low superheat state of the evaporator outlet; therefore, the utility model utilizes the evaporator outlet low superheat auxiliary control device and the existing conventional test condition of the evaporator capacity test bench with the evaporator outlet superheat greater than 5 degrees Celsius, so as to perform the capacity test of the tested evaporator 4 in the low superheat state of the evaporator outlet, thereby solving the problem of inaccurate capacity test of the existing conventional evaporator capacity test bench in the low superheat state of the evaporator outlet, and has the advantages of high test accuracy, low cost, and the ability to expand the scope of application of the existing conventional evaporator capacity test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Figure 1 This is a schematic structural diagram of the evaporator outlet low superheat auxiliary control device of the present invention;

[0023] Figure 2 This is a structural diagram of the evaporator capacity testing device of the present utility model. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the embodiments and the accompanying drawings to help those skilled in the art better understand the utility model concept of the present invention. However, the scope of protection of the claims of the present invention is not limited to the following embodiments. For those skilled in the art, all other embodiments obtained without creative work without departing from the utility model concept of the present invention shall fall within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1As shown, the utility model discloses an evaporator outlet low superheat auxiliary control device, comprising: a sealed tank body 1, a heating tube 2 and a heat exchange coil 3; the sealed tank body 1 is filled with R123 refrigerant, the heating tube 2 and the heat exchange coil 3 are both installed in the sealed tank body 1 and immersed in the R123 refrigerant, and the heating tube 2 and the heat exchange coil 3 are respectively located at the bottom and the upper part of the sealed tank body 1, and the inlet 3a and the outlet 3b of the heat exchange coil 3 respectively extend out of the sealed tank body 1.

[0027] Therefore, by utilizing the characteristic of R123 refrigerant having a lower pressure corresponding to normal saturation temperature, it is used as a secondary refrigerant to realize heat exchange between the heating tube 2 and the refrigerant flowing through the heat exchange coil 3 through the R123 refrigerant. By controlling the heating power of the heating tube 2, the temperature rise of the refrigerant flowing through the heat exchange coil 3 can be stably and accurately controlled.

[0028] The above is a basic implementation of the first embodiment. Further optimization, improvement and limitation can be made based on this basic implementation:

[0029] Preferably, the sealed tank body 1 is equipped with a pressure relief valve 6 so that when the internal pressure of the sealed tank body 1 is greater than the rated pressure of the pressure relief valve 6 , the pressure relief valve 6 is opened to provide pressure relief protection.

[0030] Preferably, a pressure gauge 7 is installed on the top of the sealed tank 1, and a pressure protector 8 is connected in series between the power supply end of the heating tube 2 and its power supply. The pressure signal input end of the pressure protector 8 is connected to the pressure signal output end of the pressure gauge 7. Therefore, when the pressure detected by the pressure gauge 7 exceeds the pressure setting value of the pressure protector 8, the pressure protector 8 disconnects the power supply to the heating tube 2, thereby providing protection.

[0031] Preferably, a temperature sensor 9 and a pressure sensor 10 are installed at the outlet 3b of the heat exchange coil 3 to measure the temperature and pressure of the refrigerant respectively.

[0032] Example 2

[0033] like Figure 2 As shown, based on the above embodiment 1, this embodiment 2 also adopts the following preferred implementation methods:

[0034] An evaporator capacity testing device includes an evaporator capacity testing test bench with an existing conventional test condition of an evaporator outlet superheat greater than 5 degrees Celsius; and also includes the evaporator outlet low superheat auxiliary control device described in Example 1; the refrigerant outlet of the evaporator capacity testing test bench is connected to the refrigerant inlet of the tested evaporator 4 through a flow meter 5, the refrigerant outlet of the tested evaporator 4 is connected to the inlet 3a of the heat exchange coil 3, and the outlet 3b of the heat exchange coil 3 is connected to the refrigerant inlet of the evaporator capacity testing test bench.

[0035] Therefore, the evaporator capacity testing device of the present invention is used as follows:

[0036] When the capacity test of the evaporator 4 under test is carried out in the low superheat state at the evaporator outlet, first, the temperature of the refrigerant output from its refrigerant outlet is adjusted by the evaporator capacity test bench, so that the refrigerant output from the refrigerant outlet of the evaporator 4 under test is in a low superheat state; then, by controlling the heating power of the heating tube 2, the temperature of the refrigerant output from the outlet 3b of the heat exchange coil 3 is stably and accurately controlled, so that the refrigerant is in a normal superheat state with a temperature greater than 5 degrees Celsius, so as to meet the test conditions of the evaporator capacity test bench; finally, the enthalpy value of the refrigerant at the outlet 3b of the heat exchange coil 3 under normal superheat state is obtained by testing on the evaporator capacity test bench. Combined with the heating power of the heating tube 2 and the flow rate of the refrigerant, the enthalpy value of the refrigerant at the refrigerant outlet of the evaporator 4 under test in the low superheat state at the evaporator outlet can be accurately converted, thereby accurately realizing the capacity test of the evaporator 4 under test in the low superheat state at the evaporator outlet.

[0037] In summary, the evaporator capacity testing device of the present invention adds an evaporator outlet low superheat auxiliary control device behind the refrigerant inlet of the tested evaporator 4, so that the refrigerant in the evaporator outlet low superheat state output by the refrigerant outlet of the tested evaporator 4 can be stably and accurately heated to a normal superheat state through the evaporator outlet low superheat auxiliary control device, and meets the test conditions of the evaporator capacity test bench greater than 5 degrees Celsius, so that the refrigerant enthalpy value in the normal superheat state at the outlet 3b of the heat exchange coil 3 can be obtained through the evaporator capacity test test, and on this basis, the existing conversion formula is used, combined with the heating power of the heating tube 2 and the flow rate of the refrigerant, the refrigerant enthalpy value can be accurately converted. The enthalpy value of the refrigerant at the refrigerant outlet of the tested evaporator 4 in the low superheat state of the evaporator outlet is measured, thereby accurately realizing the capacity test of the tested evaporator 4 in the low superheat state of the evaporator outlet; therefore, the utility model utilizes the evaporator outlet low superheat auxiliary control device and the existing conventional test condition of the evaporator capacity test bench with the evaporator outlet superheat greater than 5 degrees Celsius, so as to perform the capacity test of the tested evaporator 4 in the low superheat state of the evaporator outlet, thereby solving the problem of inaccurate capacity test of the existing conventional evaporator capacity test bench in the low superheat state of the evaporator outlet, and has the advantages of high test accuracy, low cost, and the ability to expand the scope of application of the existing conventional evaporator capacity test bench.

[0038] The above is the basic implementation of the second embodiment. Further optimization, improvement and limitation can be made based on this basic implementation:

[0039] Preferably, an expansion valve 11 is connected in series to the connecting pipe between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator 4 under test. Thus, the refrigerant flow through the evaporator 4 under test can be controlled by adjusting the opening of the expansion valve 11, thereby controlling the refrigerant enthalpy at the refrigerant outlet of the evaporator 4 under test, thereby achieving faster, more stable, and more accurate control of the low superheat state at the evaporator outlet.

[0040] Preferably, a sight glass 12 is connected in series to the connecting pipeline between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator 4 to be tested, so as to observe the state of the refrigerant in the pipeline.

[0041] The present invention is not limited to the above-mentioned specific implementation methods. According to the above content, in accordance with the common technical knowledge and customary means in this field, without departing from the above-mentioned basic technical ideas of the present invention, the present invention can also make other various forms of equivalent modifications, replacements or changes, all of which fall within the scope of protection of the present invention.

Claims

1. An evaporator outlet low superheat auxiliary control device, characterized in that: include: A sealed tank body (1), a heating pipe (2) and a heat exchange coil (3); the sealed tank body (1) is filled with R123 refrigerant, the heating pipe (2) and the heat exchange coil (3) are both installed in the sealed tank body (1) and immersed in the R123 refrigerant, and the heating pipe (2) and the heat exchange coil (3) are respectively located at the bottom and the top of the sealed tank body (1), and the inlet (3a) and the outlet (3b) of the heat exchange coil (3) respectively extend out of the sealed tank body (1).

2. The evaporator outlet low superheat auxiliary control device according to claim 1, characterized in that: The sealed tank body (1) is equipped with a pressure relief valve (6).

3. The evaporator outlet low superheat auxiliary control device according to claim 1 or 2, characterized in that: A pressure gauge (7) is installed on the top of the sealed tank body (1), a pressure protector (8) is connected in series between the power supply end of the heating tube (2) and its power supply, and the pressure signal input end of the pressure protector (8) is connected to the pressure signal output end of the pressure gauge (7).

4. The evaporator outlet low superheat auxiliary control device according to claim 1 or 2, characterized in that: A temperature sensor (9) and a pressure sensor (10) are installed at the outlet (3b) of the heat exchange coil (3).

5. An evaporator capacity test device, comprising an evaporator capacity test bench with a test condition of an evaporator outlet superheat greater than 5 degrees Celsius; characterized in that: It also includes the evaporator outlet low superheat auxiliary control device as described in any one of claims 1 to 4; the refrigerant outlet of the evaporator capacity test bench is connected to the refrigerant inlet of the tested evaporator (4) through a flow meter (5), the refrigerant outlet of the tested evaporator (4) is connected to the inlet (3a) of the heat exchange coil (3), and the outlet (3b) of the heat exchange coil (3) is connected to the refrigerant inlet of the evaporator capacity test bench.

6. The evaporator capacity testing device according to claim 5, characterized in that: An expansion valve (11) is connected in series to the connecting pipeline between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator (4) to be tested.

7. The evaporator capacity testing device according to claim 5 or 6, characterized in that: A sight glass (12) is connected in series to the connecting pipeline between the refrigerant outlet of the evaporator capacity test bench and the refrigerant inlet of the evaporator (4) to be tested.

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