Device for measuring influence of refrigerant leakage on refrigeration system in real time and method thereof

Abstract

The application discloses a kind of real-time tracking refrigerant leakage influence measuring device and method of refrigeration system, it is related to refrigeration system field.Measuring device includes wet gas flowmeter, heater and at least two micro regulating valves;The micro regulating valve is sequentially connected by pipeline provided with heater, the micro regulating valve for being located in first end is used to be connected with the pipeline of refrigeration system to be measured, and the micro regulating valve at terminal is connected with wet gas flowmeter filled with not volatile liquid;Temperature collector and pressure collector for measuring gas temperature and pressure are provided on wet gas flowmeter.The measuring device provided by the application can realize real-time detection to system leakage speed and remaining refrigerant charge by simple device.

Description

Technical Field

[0001] This invention relates to the field of refrigeration systems, and more particularly to a measuring device and method for real-time tracking of the impact of refrigerant leakage on refrigeration systems. Background Technology

[0002] Refrigerant leakage is a common fault in the operation of refrigeration systems. Refrigerant leakage can have a significant impact on the system's performance, including: a decrease in evaporation and condensation pressure, an increase in exhaust temperature, and a reduction in system operating efficiency. In such cases, achieving the same cooling effect will require increased energy consumption, and may even lead to compressor shutdown, ultimately resulting in system damage.

[0003] Currently, the impact of refrigerant leakage on system operation is typically studied by charging the refrigerant in a gradient manner. For example, the refrigeration system is charged with refrigerant sequentially at 60%, 70%, 80%, 90%, and 100%, and the changes in various parameters in the system at different charge levels are measured and recorded to study the impact of refrigerant leakage on system performance and other parameters. However, studying the impact of refrigerant leakage solely through gradient changes in charge ignores the dynamic coupling changes of various parameters during the leakage process, and only obtains data at each steady-state parameter point of the system.

[0004] Furthermore, when studying refrigeration system leaks, measuring the amount of leakage and the remaining refrigerant charge has always been a key challenge. When a leak occurs, the refrigerant leaks from the pipes into the external atmosphere, creating a strong throttling effect. This can lead to ice blockage at the leak point or opening, or the lubricating oil in the refrigerant can also clog the leak, hindering experimental research.

[0005] Therefore, how to achieve real-time measurement of the remaining charge in a refrigeration system using a simple device is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to overcome the deficiencies in the prior art and to provide a measuring device and method for real-time tracking of the impact of refrigerant leakage on a refrigeration system.

[0007] The specific technical solution adopted in this invention is as follows:

[0008] In a first aspect, the present invention provides a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system, comprising a wet gas flow meter, a heater, and at least two micro-adjustment valves; the micro-adjustment valves are connected in sequence through a pipeline equipped with a heater, the micro-adjustment valve at the first end is used to connect to the pipeline to be measured in the refrigeration system, and the micro-adjustment valve at the end is connected to a wet gas flow meter filled with a non-volatile liquid; the wet gas flow meter is equipped with a temperature acquisition device and a pressure acquisition device for measuring gas temperature and pressure.

[0009] Preferably, the heater is an electric heater.

[0010] Preferably, the non-volatile liquid filled in the wet gas flow meter is silicone oil.

[0011] Preferably, the refrigeration system includes a compressor, a condenser, a throttling device, and an evaporator connected sequentially by pipelines.

[0012] Furthermore, the compressor has an exhaust temperature protection device.

[0013] Preferably, the pipeline connecting the micro-regulating valve at the first end to the refrigeration system is made of copper tubing of the same size and specifications as the refrigeration system piping.

[0014] Preferably, the piping connecting adjacent micro-adjustment valves uses pneumatic hoses of the same size and specifications as the piping in the refrigeration system.

[0015] Preferably, the pipeline connecting the micro-regulating valve at the end to the wet gas flow meter uses a pneumatic hose of the same size and specifications as the refrigeration system pipeline.

[0016] Preferably, there are two micro-adjustment valves, namely a first micro-adjustment valve and a second micro-adjustment valve.

[0017] Secondly, the present invention provides a measurement method using a measuring device described in any of the first aspects for real-time tracking of the impact of refrigerant leakage on a refrigeration system, as detailed below:

[0018] S1: Connect the micro-regulating valve at the beginning to the pipeline to be measured in the refrigeration system. The wet gas flow meter satisfies formula (1).

[0019] V×ρ=v leak ×t (1)

[0020] In the formula, V represents the volumetric range of the wet gas flow meter, in cm³. 3 ρ is the density of the refrigerant, in g / cm³. 3 v leak The value represents the refrigerant leakage rate, expressed in g / s, and t represents the leakage time, expressed in seconds.

[0021] S2: Charge the refrigeration system with the preset refrigerant charge amount M;

[0022] S3: To enable the refrigeration system to operate under rated conditions;

[0023] S4: Open the micro-regulating valve at the beginning, control the opening of the other micro-regulating valves and the heating power of the heater, so that the refrigeration system leaks, and at the same time avoid the throttling effect of the refrigerant flowing through the micro-regulating valve, which would cause ice blockage in the pipe.

[0024] S5: Record the leakage time t and the volume data V of the wet gas flow meter. t And the temperature T and pressure p data of the wet gas flow meter;

[0025] S6: By analyzing the data obtained at each time point, the refrigerant leakage M of the refrigeration system at each time point can be obtained. leak and the remaining charge M in the system t .

[0026] Preferably, step S6 is as follows:

[0027] First, based on the pressure and temperature data from the wet gas flow meter, obtain the density ρ. Then, the refrigerant leakage at each time point is:

[0028] M leak =V t ×ρ(p,T) (2);

[0029] Given the system's preset charge volume M, the remaining charge volume at each time point in the system is:

[0030] M t =MM leak (3).

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The measuring device of this invention can realize real-time measurement of the leakage and remaining charge of the refrigeration system. The device is simple and the experimental data processing is convenient, thus realizing convenient and fast experimental measurement. In addition, this invention also solves the problem of leakage port blockage caused by the strong throttling effect at the leakage port when the system leaks, creating conditions for the smooth conduct of the experiment. Attached Figure Description

[0033] The main features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0034] Figure 1A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a first embodiment of the present invention is shown.

[0035] Figure 2 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a second embodiment of the present invention is shown.

[0036] Figure 3 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a third embodiment of the present invention is shown.

[0037] Figure 4 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a fourth embodiment of the present invention is shown.

[0038] Figure 5 A schematic diagram of the arrangement of a wet gas flow meter and temperature and pressure data acquisition unit in a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system is shown.

[0039] The attached diagram is labeled as follows: 1. Compressor; 2. Condenser; 3. Throttling device; 4. Evaporator; 5. First micro-regulating valve; 6. Second micro-regulating valve; 7. Heater. Detailed Implementation

[0040] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0041] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] To overcome the shortcomings of existing technologies, this invention provides a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system. This measuring device mainly includes a wet gas flow meter, a heater 7, and at least two micro-adjustment valves. The micro-adjustment valves are connected sequentially through a pipeline equipped with the heater 7. The first micro-adjustment valve is connected to the pipeline to be measured in the refrigeration system, and the last micro-adjustment valve is connected to the wet gas flow meter filled with a non-volatile liquid. Figure 5 As shown, the wet gas flow meter is equipped with a temperature acquisition unit and a pressure acquisition unit for measuring gas temperature and pressure.

[0043] The functions of each component in the measuring device of this invention are as follows: a temperature acquisition unit for acquiring the refrigerant temperature in the measuring device; a pressure acquisition unit for acquiring the refrigerant pressure in the measuring device; a refrigeration system, including a compressor, condenser, throttling device, and evaporator connected in sequence; a wet gas flow meter for measuring the volume of refrigerant leaking from the refrigeration system; a first micro-regulating valve installed between the refrigeration system and a second micro-regulating valve to control the refrigerant leakage rate of the refrigeration system; a second micro-regulating valve installed between the first micro-regulating valve and the wet gas flow meter to achieve two-stage throttling of the valves; and an electric heater to provide heat to the two-stage throttling device to prevent the pipeline from becoming blocked due to the strong throttling effect of the refrigerant. The measuring device provided by this invention can achieve real-time detection of the system leakage rate and the remaining refrigerant charge through a simple device.

[0044] The following are combined with Figures 1 to 4 This invention describes a measurement device for real-time tracking of the impact of refrigerant leakage on a refrigeration system, based on several embodiments.

[0045] First see Figure 1 , Figure 1 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a first embodiment of the present invention is shown.

[0046] A measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system includes a first micro-regulating valve 5, a second micro-regulating valve 6, an electric heater 7, and a wet gas flow meter. The refrigeration system includes a compressor 1, a condenser 2, a throttling device 3, and an evaporator 4 connected in sequence.

[0047] The measuring device of this invention, which tracks the impact of refrigerant leakage on the refrigeration system in real time, is connected between the compressor 1 and the condenser 2 to measure the system leakage amount and the change in the remaining charge amount in the system when a leak occurs in the pipeline from the compressor to the condenser. In this case, the leakage is a gaseous refrigerant leak, specifically refrigerant gas from the compressor outlet, which has a high pressure and a relatively strong throttling effect. However, due to the high temperature of the refrigerant itself, ice blockage or lubricating oil blockage at the refrigerant leak point is not particularly noticeable in this example. The valve of the second micro-regulating valve can be kept at a large opening, eliminating the need to heat the pipeline between the first and second micro-regulating valves.

[0048] See below. Figure 2 , Figure 2 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a second embodiment of the present invention is shown. Figure 2 The refrigerant remaining charge measuring device shown is... Figure 1 Similarly, with Figure 1Unlike the refrigerant remaining charge measuring device shown, in this embodiment, the measuring device is installed between the condenser 2 and the throttling device 3, and the system experiences a pipeline leak between the condenser 2 and the throttling device 3. In this embodiment, the system experiences a high-pressure, high-temperature liquid phase leak, which will cause a very strong throttling effect when passing through the leak point. It is necessary to keep the valve opening of the second micro-regulating valve at a small opening and heat the pipeline between the first and second micro-regulating valves to solve the pipeline ice blockage problem caused by the throttling effect.

[0049] For both the first and second embodiments, the connecting air hoses used in the examples must be high-temperature and high-pressure resistant hoses to prevent the pipes from bursting and causing danger.

[0050] See below. Figure 3 , Figure 3 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a third embodiment of the present invention is shown. Figure 3 The refrigerant remaining charge measuring device shown is... Figure 2 Similarly, with Figure 2 Unlike the refrigerant remaining charge measuring device shown, in this embodiment, the measuring device is installed between the throttling device 3 and the evaporator 4. The system experiences a pipe leak between the throttling device 3 and the evaporator 4. In this embodiment, the system experiences a low-pressure, low-temperature liquid phase leak. The throttling effect at the leak point is relatively weak. However, the refrigerant itself is at a low temperature and contains lubricating oil, making it easier for the leak point to be blocked by liquid lubricating oil. Therefore, the pipe between the first and second micro-regulating valves needs to be heated. The valve opening of the second micro-regulating valve does not need to be kept at a small opening.

[0051] See below. Figure 4 , Figure 4 A schematic diagram of a measuring device for real-time tracking of the impact of refrigerant leakage on a refrigeration system according to a third embodiment of the present invention is shown. Figure 4 The refrigerant remaining charge measuring device shown is... Figure 3 Similarly, with Figure 3 Unlike the refrigerant remaining charge measuring device shown, in this embodiment, the measuring device is installed between the evaporator 4 and the compressor 1, and the system experiences a pipeline leak between the evaporator 4 and the compressor 1. In this embodiment, the system experiences a low-pressure, low-temperature gaseous refrigerant leak. The throttling effect at the leak point is relatively weak, but the refrigerant itself is at a low temperature and contains lubricating oil, making it easier for the leak point to be blocked by liquid lubricating oil. It is necessary to heat the pipeline between the first and second micro-regulating valves, and the valve opening of the second micro-regulating valve does not need to be kept at a small opening.

[0052] For the third and fourth embodiments, since the refrigerant inside the pipes is low-temperature and low-pressure, there are no special requirements for the connecting gas hoses used in the examples.

[0053] Furthermore, in the above embodiments, if the refrigerant used in the refrigeration system is a flammable or toxic refrigerant such as R290 or NH3, a long gas hose needs to be connected after the wet gas flow meter to discharge the refrigerant gas in the wet gas flow meter to a safe space. For flammable refrigerants, the high temperature and high pressure resistance and heating capacity of the pipeline between the first and second micro-regulating valves must be strictly controlled.

[0054] This invention also provides a method for measuring system refrigerant leakage and remaining charge, applied to a measuring device described above for real-time tracking of the impact of refrigerant leakage on a refrigeration system. The method mainly includes:

[0055] Step 1: Design the aforementioned measuring device for real-time tracking of the impact of refrigerant leakage on the refrigeration system and connect it to the refrigeration system. Specifically, it is necessary to select the micro-regulating valve and wet gas flow meter for the measuring device. The design volumetric range V of the wet gas flow meter should ensure that the refrigerant can leak at a certain rate v. leak The leakage lasts for a considerable period of time, t, i.e.:

[0056] V×ρ=v leak ×t

[0057] In the formula, V represents the volumetric range of the wet gas flow meter, in cm³. 3 ρ is the density of the refrigerant, in g / cm³. 3 v leak The value represents the refrigerant leakage rate in g / s, and t represents the leakage time in seconds.

[0058] Step 2: Charge the refrigeration system with the preset refrigerant charge M.

[0059] Step 3: Run the refrigeration system under rated operating conditions.

[0060] Step 4: Open the first micro-adjustment valve, control the opening degree of the second micro-adjustment valve and the heating power of the electric heater, so as to cause a leak in the refrigeration system.

[0061] Step 5: Record the leakage time t and the volume data V of the wet gas flow meter. t And temperature (T) and pressure (P) data from the wet gas flow meter.

[0062] Step 6: Analyze the data obtained at each time point to obtain the refrigerant leakage M of the system at each time point. leakand the remaining charge M in the system t Specifically, based on the pressure and temperature data from the wet gas flow meter, the density ρ is obtained, and then the refrigerant leakage at each time point is:

[0063] M leak =V t ×ρ(p,T)

[0064] Given the system's preset charge volume M, the remaining charge volume at each time step is:

[0065] M t =MM leak .

[0066] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A measuring method using a measuring device for measuring an influence of a refrigerant leakage on a refrigeration system in real time, characterized by, The measuring device for real-time tracking of the impact of refrigerant leakage on the refrigeration system includes a wet gas flow meter, a heater (7), and at least two micro-adjustment valves; the micro-adjustment valves are connected in sequence through a pipeline equipped with a heater (7), the micro-adjustment valve at the first end is used to connect to the pipeline to be measured in the refrigeration system, and the micro-adjustment valve at the end is connected to a wet gas flow meter filled with a non-volatile liquid; the wet gas flow meter is equipped with a temperature acquisition device and a pressure acquisition device for measuring gas temperature and pressure; The specific measurement method is as follows: S1: Connect the micro-adjustment valve at the beginning to the pipeline to be measured in the refrigeration system, and the wet gas flow meter satisfies formula (1). （1） In the formula, V is the volume range of the wet gas flowmeter, in cm 3 ; p is the refrigerant density, in g / cm 3 ; is the refrigerant leakage speed, in g / s; t is the leakage time, in s; S2: Charge the refrigeration system with the preset refrigerant charge amount M; S3: To enable the refrigeration system to operate under rated conditions; S4: Open the micro-regulating valve at the beginning, control the opening degree of the remaining micro-regulating valves and the heating power of the heater (7) to cause leakage in the refrigeration system, and at the same time avoid the throttling effect that occurs when the refrigerant flows through the micro-regulating valve, which will cause ice blockage in the pipeline. S5: record the leakage time t, volume data of the wet gas flowmeter and temperature T, pressure p data of the wet gas flowmeter; S6: analyzing the data obtained at each time point, i.e. obtaining the refrigerant leakage amount of the refrigeration system at each time point and the remaining charge amount in the system .

2. The measurement method according to claim 1, characterized in that, The heater (7) is an electric heater.

3. The measurement method according to claim 1, characterized in that, The non-volatile liquid filled in the wet gas flow meter is silicone oil.

4. The measurement method according to claim 1, characterized by, The refrigeration system includes a compressor (1), a condenser (2), a throttling device (3), and an evaporator (4) connected end to end by pipelines.

5. The measurement method according to claim 4, characterized in that, The compressor (1) has an exhaust temperature protection device.

6. The measurement method of claim 1, wherein, The micro-adjustment valve located at the beginning is connected to the refrigeration system via a copper pipe of the same size and specifications as the refrigeration system pipe.

7. The method of claim 1, wherein, The piping connecting adjacent micro-adjustment valves uses pneumatic hoses of the same size and specifications as the refrigeration system piping.

8. The measurement method of claim 1, wherein, The pipeline connecting the micro-regulating valve at the end to the wet gas flow meter uses a pneumatic hose of the same size and specifications as the refrigeration system pipeline.

9. The method of claim 1, wherein, Step S6 is as follows: First, according to the pressure and temperature data of the wet gas flowmeter, the density The refrigerant leakage amount at each time is: （2）； Given the system's preset charge volume M, the remaining charge volume at each time point in the system is: （3）。

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