Refrigeration liquid supply control method and system

Abstract

The invention discloses a refrigeration liquid supply control method and system, and the method comprises the following steps: obtaining a real-time phase state of a medium during gas return, the real-time phase state comprising a liquid state and / or a gas state; the liquid supply state is adjusted according to the real-time phase state, and under the condition that the real-time phase state meets the preset phase state, the real-time temperature of the medium during gas return is obtained; and adjusting the liquid supply state according to the real-time temperature. The system is implemented by adopting the method. According to the refrigeration liquid supply control method and system, the phase state of the refrigeration medium can be well and accurately judged, the liquid supply state is adjusted in time according to the phase state of the medium, and therefore the overall refrigeration efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigeration liquid supply control method and system. Background Art

[0002] In traditional barrel pump liquid supply refrigeration systems, manual regulating valves are commonly used to adjust the liquid flow. However, manual regulating valves have low adjustment accuracy, slow response speed, and cannot meet the needs of precise control under dynamic conditions. In addition, the state of the refrigerant in the return air pipeline (liquid or gas) directly affects the operating efficiency of the system. The existing detection method fails to effectively determine the phase state of the refrigerant in the return air pipeline, resulting in the inability to perform precise control and low refrigeration efficiency. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a refrigeration liquid supply control method and system, which can accurately judge the phase state of the refrigerant medium and adjust the liquid supply state in time according to the phase state of the medium, thereby resulting in high overall refrigeration efficiency.

[0004] The present invention provides a refrigeration liquid supply control method, comprising the following steps:

[0005] Acquiring the real-time phase state of the medium during gas return, wherein the real-time phase state includes liquid and / or gaseous state;

[0006] Adjusting the liquid supply state according to the real-time phase state, and obtaining the real-time temperature of the medium during the return gas when the real-time phase state satisfies the preset phase state;

[0007] The liquid supply state is adjusted according to the real-time temperature.

[0008] In one embodiment, obtaining the real-time phase state of the medium during the return gas further includes:

[0009] By detecting the rays penetrating the return air duct during the return air flow;

[0010] detecting the attenuation degree of the detection ray passing through the return air duct;

[0011] The real-time phase state of the medium in the return air duct is obtained according to the attenuation degree.

[0012] In one embodiment, obtaining the real-time phase state of the medium during the return gas further includes:

[0013] Ultrasonic waves are transmitted in the return air duct during return air flow;

[0014] Obtain the transmission speed of ultrasonic waves;

[0015] The real-time phase state of the medium in the return air duct is obtained according to the transfer speed.

[0016] In one embodiment, obtaining the real-time phase state of the medium during the return gas further includes:

[0017] Obtain capacitance data in the return air duct during return air flow;

[0018] The real-time phase state in the return air duct is acquired according to the capacitance data.

[0019] In one embodiment, obtaining the real-time phase state of the medium during the return gas further includes:

[0020] Acquire a thermal image of the air return duct during the air return;

[0021] The real-time phase state in the return air duct is acquired according to the thermal imaging data.

[0022] In one embodiment, adjusting the liquid supply state according to the real-time phase state further includes:

[0023] Determine the volume ratio of liquid to gas in real-time phase state;

[0024] The liquid supply state is adjusted according to the volume ratio.

[0025] In one embodiment, the adjusting the liquid supply state according to the real-time temperature further includes:

[0026] Calculate the temperature difference between the real-time temperature and the preset temperature;

[0027] When the temperature difference is not less than the preset difference, the existing liquid supply state is maintained;

[0028] When the temperature difference is less than the preset temperature, gradually reduce the liquid supply.

[0029] The present invention also provides a refrigeration liquid supply control system, which adopts any one of the refrigeration liquid supply control methods described above, including a cold air blower, a liquid inlet pipe, an air return pipe and a control module, the liquid inlet pipe and the air return pipe are respectively connected to the inlet and outlet of the cold air blower, the liquid inlet pipe is equipped with an electronic expansion valve, and the return air pipe is equipped with a temperature sensor and a detection device, and the electronic expansion valve, temperature sensor and detection device are all electrically connected to the control module.

[0030] In one embodiment, the control system further comprises a filter, a first stop valve and a solenoid valve, and the filter, the first stop valve and the solenoid valve are all mounted on the liquid inlet pipe.

[0031] In one embodiment, the control system further includes a pressure gauge, a sight glass and a second stop valve, and the pressure gauge, the sight glass and the second stop valve are all mounted on the return air duct.

[0032] The refrigeration liquid supply control method and system provided by the present invention can accurately judge the phase state of the refrigeration medium and adjust the liquid supply state in time according to the phase state of the medium, thereby resulting in high overall refrigeration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic flow chart of the refrigeration liquid supply control method provided by the present invention.

[0035] Figure 2 This is a structural schematic diagram of the refrigeration liquid supply control system provided by the present invention. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] The terms "first", "second", "third", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0040] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0041] Embodiment 1

[0042] See also Figure 1 The refrigeration liquid supply control method provided by the present invention comprises the following steps:

[0043] S1, obtaining the real-time phase state of the medium during the return gas, wherein the real-time phase state includes liquid and / or gaseous state.

[0044] It is understandable that the above steps may further include:

[0045] S101, detecting the return air duct 8 when the ray penetrates the return air.

[0046] It is known that the detection radiation may be emitted by an x-ray photoelectron spectrometer.

[0047] S102, detecting the attenuation degree of the detection ray passing through the return air duct 8;

[0048] S103, obtaining the real-time phase state of the medium in the return air duct 8 according to the attenuation degree.

[0049] It can be known that the attenuation of radiation by liquid is greater, while the attenuation of radiation by gaseous refrigerant is smaller. Therefore, the phase of the refrigerant provided in the return air duct 8 can be quickly judged.

[0050] S2, adjusting the liquid supply state according to the real-time phase state, and obtaining the real-time temperature of the medium during the return gas when the real-time phase state satisfies the preset phase state.

[0051] It is understandable that the above steps may further include:

[0052] S201, determining the volume ratio of liquid to gas in the real-time phase state.

[0053] It can be understood that the volume ratio of the liquid state to the gas state can be the ratio of the volume of the liquid state to the accommodation volume inside the return air duct 8 and the ratio of the volume of the gas state to the accommodation volume inside the return air duct 8 respectively.

[0054] S202, adjusting the liquid supply state according to the volume ratio.

[0055] It can be understood that the larger the volume ratio value of the gas state is, the smaller the volume ratio value of the liquid state is. In this case, the opening degree of the liquid supply will be gradually reduced, otherwise, the opening degree of the liquid supply will be gradually increased.

[0056] In this embodiment, the preset phase state can be understood as a state in which the phase state is completely gaseous. When the phase state is completely gaseous, the temperature of the medium inside the return air duct 8 is judged.

[0057] S3, adjusting the liquid supply status according to the real-time temperature.

[0058] It is understandable that the above steps may further include:

[0059] S301, calculating the temperature difference between the real-time temperature and the preset temperature.

[0060] It can be known that the preset temperature may be the corresponding saturation temperature, and the difference between the real-time temperature and the saturation temperature is the superheat.

[0061] S302: When the temperature difference is not less than a preset difference, the existing liquid supply state is maintained.

[0062] It can be understood that when the superheat is between 1-5K, the existing liquid supply state is maintained.

[0063] S303, when the temperature difference is less than the preset temperature, gradually reduce the liquid supply amount.

[0064] It can be understood that the temperature is gradually reduced until the superheat is between 1-5K.

[0065] Embodiment 2

[0066] The difference between this embodiment and the first embodiment is that:

[0067] Acquiring the real-time phase state of the medium during the return gas further includes:

[0068] The ultrasonic wave is propagated in the return air duct 8 during the return air flow;

[0069] Obtain the transmission speed of ultrasonic waves;

[0070] The real-time phase state of the medium in the return air duct 8 is obtained according to the transfer speed.

[0071] It is understandable that the density of the liquid medium is larger than that of the gaseous medium, and the volume ratio of the liquid medium and the gaseous medium in the return air duct 8 can be determined based on the propagation speed of the ultrasonic wave in the return air duct 8 .

[0072] Embodiment 3

[0073] The difference between this embodiment and the first embodiment of the comparative document is that:

[0074] Acquire capacitance data in the air return duct 8 during air return;

[0075] The real-time phase state in the return air duct 8 is acquired according to the capacitance data.

[0076] It is understandable that by installing a capacitance sensor outside the return air duct 8, the capacitance change of the gas-liquid two-phase fluid in the return air duct 8 is measured, the capacitance distribution image is reconstructed, and then the volume ratio of the liquid and gas phases is calculated.

[0077] Embodiment 4

[0078] The difference between this embodiment and the first embodiment is that:

[0079] Acquiring the real-time phase state of the medium during the return gas further includes:

[0080] Acquire a thermal image of the air return duct 8 during air return;

[0081] The real-time phase state in the return air duct 8 is acquired according to the thermal imaging data.

[0082] It can be understood that by measuring the temperature distribution outside the return air duct 8 with an infrared thermal imager and inferring the volume ratio of the gas-liquid two-phase medium in the return air duct 8, the thermal conductivity of the refrigerant in the liquid phase is higher and the temperature changes faster; the thermal conductivity of the refrigerant in the gas medium is lower and the temperature changes slower.

[0083] Embodiment 5

[0084] The difference between this embodiment and the first embodiment is that:

[0085] Acquiring the real-time phase state of the medium during the return gas further includes:

[0086] A heating wire is installed upstream of the return air duct 8, and temperature sensors are installed upstream and downstream of the return air duct 8 to monitor the thermal conductivity of the refrigerant. The thermal conductivity of liquid refrigerant is high, resulting in a faster temperature change; while the thermal conductivity of gaseous refrigerant is low, resulting in a slower temperature change. Therefore, the temperature of the upper and lower parts of the return air duct 8 can be measured downstream of the return air duct. If there is no temperature difference, it can be determined that the medium inside the return air duct 8 is in the same phase state, and the phase state of the medium inside the return air duct 8 can be determined by calculating the analog value of the temperature change.

[0087] Embodiment 6

[0088] The difference between this embodiment and the first embodiment is that:

[0089] Acquiring the real-time phase state of the medium during the return gas further includes:

[0090] Pressure-enthalpy diagram method: Use the relationship between pressure and enthalpy to determine the state of the refrigerant.

[0091] Embodiment 7

[0092] The difference between this embodiment and the first embodiment is that:

[0093] Acquiring the real-time phase state of the medium during the return gas further includes:

[0094] Model Predictive Control (MPC): By establishing a mathematical model of the system, the future state of the medium in the return air duct 8 is predicted, and the subsequent liquid supply state is adjusted according to the prediction results. The mathematical model can predict the future state of the medium based on temperature and pressure.

[0095] Embodiment 8

[0096] The difference between this embodiment and the first embodiment is that:

[0097] Machine learning algorithm: Use historical data to train the model, determine the state of the refrigerant through pattern recognition and data analysis, or use temperature data and pressure data to predict the phase state of the medium.

[0098] Embodiment 9

[0099] See also Figure 2 The present embodiment provides a refrigeration liquid supply control system, which adopts the above-mentioned refrigeration liquid supply control method, including a cold air machine 1, a liquid inlet pipe 2, a return air pipe 8 and a control module, wherein the liquid inlet pipe 2 and the return air pipe 8 are respectively connected to the inlet and outlet of the cold air machine 1, the liquid inlet pipe 2 is equipped with an electronic expansion valve 6, and the return air pipe 8 is equipped with a temperature sensor 11 and a detection device 10, and the electronic expansion valve 6, the temperature sensor 11 and the detection device 10 are all electrically connected to the control module.

[0100] It can be understood that the logic of the above-mentioned control method is embedded in the control module, the temperature sensor 11 is used to obtain the temperature data inside the return air duct 8, the detection device 10 is used to obtain the phase state of the medium, and the electronic expansion valve 6 is used to control the flow rate of the medium in the liquid inlet pipe 2. The smaller the medium flow rate, the less medium enters the air cooler 1. Therefore, the proportion of gas in the return air duct 8 will be higher, until the return air duct 8 is completely in a gaseous phase.

[0101] See also Figure 2 In some embodiments, the control system further includes a filter 4 , a first stop valve 3 and a solenoid valve 5 , and the filter 4 , the first stop valve 3 and the solenoid valve 5 are all assembled on the liquid inlet pipe 2 .

[0102] It can be understood that the first stop valve 3 is farthest from the air cooler 1 relative to other components, followed by the filter 4, the solenoid valve 5 and the electronic expansion valve 6. The filter 4 can filter the refrigerant medium. The solenoid valve 5 and the first stop valve 3 can both control the opening and closing of the liquid inlet pipe 2. A pressure gauge 7 can also be installed on the liquid inlet pipe 2 to measure the pressure data in the liquid inlet pipe 2.

[0103] Please continue reading Figure 2 In some embodiments, the control system further includes a pressure gauge 7 , a sight glass 13 and a second stop valve 9 , and the pressure gauge 7 , the sight glass 13 and the second stop valve 9 are all mounted on the return air duct 8 .

[0104] It can be understood that the sight glass 13 can facilitate manual observation of the phase state of the medium in the return air pipe 8, the pressure gauge 7 can measure the pressure data in the return air pipe 8, and the pressure sensor 12 can also be installed on the return air pipe 8 to measure the pressure.

[0105] From the above description, it can be known that the refrigeration liquid supply control method and system provided by the present invention can accurately judge the phase state of the refrigeration medium and adjust the liquid supply state in time according to the phase state of the medium, thereby resulting in high overall refrigeration efficiency.

[0106] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A refrigeration liquid supply control method, characterized in that: The steps include: Acquiring the real-time phase state of the medium during gas return, wherein the real-time phase state includes liquid and / or gaseous state; Adjusting the liquid supply state according to the real-time phase state, and obtaining the real-time temperature of the medium during the return gas when the real-time phase state satisfies the preset phase state; The liquid supply state is adjusted according to the real-time temperature.

2. The refrigeration liquid supply control method according to claim 1, characterized in that: The obtaining of the real-time phase state of the medium during the return gas further comprises: By detecting the rays penetrating the return air duct during the return air flow; detecting the attenuation degree of the detection ray passing through the return air duct; The real-time phase state of the medium in the return air duct is obtained according to the attenuation degree.

3. The refrigeration liquid supply control method according to claim 1, characterized in that: The obtaining of the real-time phase state of the medium during the return gas further comprises: Ultrasonic waves are transmitted in the return air duct during return air flow; Obtain the transmission speed of ultrasonic waves; The real-time phase state of the medium in the return air duct is obtained according to the transfer speed.

4. The refrigeration liquid supply control method according to claim 1, characterized in that: The obtaining of the real-time phase state of the medium during the return gas further comprises: Obtain capacitance data in the return air duct during return air flow; The real-time phase state in the return air duct is acquired according to the capacitance data.

5. The refrigeration liquid supply control method according to claim 1, characterized in that: The obtaining of the real-time phase state of the medium during the return gas further comprises: Acquire a thermal image of the air return duct during the air return; The real-time phase state in the return air duct is acquired according to the thermal imaging data.

6. The refrigeration liquid supply control method according to claim 1, characterized in that: The adjusting the liquid supply state according to the real-time phase state further comprises: Determine the volume ratio of liquid to gas in real-time phase state; The liquid supply state is adjusted according to the volume ratio.

7. The refrigeration liquid supply control method according to claim 1, characterized in that: The adjusting the liquid supply state according to the real-time temperature further comprises: Calculate the temperature difference between the real-time temperature and the preset temperature; When the temperature difference is not less than the preset difference, the existing liquid supply state is maintained; When the temperature difference is less than the preset temperature, gradually reduce the liquid supply.

8. A refrigeration liquid supply control system, characterized in that: The refrigeration liquid supply control method according to any one of claims 1 to 7 includes an air cooler, a liquid inlet pipe, an air return pipe and a control module, the liquid inlet pipe and the air return pipe are respectively connected to the inlet and outlet of the air cooler, the liquid inlet pipe is equipped with an electronic expansion valve, the air return pipe is equipped with a temperature sensor and a detection device, and the electronic expansion valve, temperature sensor and detection device are all electrically connected to the control module.

9. The refrigeration liquid supply control system according to claim 8, characterized in that: The control system further comprises a filter, a first stop valve and a solenoid valve, and the filter, the stop valve and the solenoid valve are all assembled on the liquid inlet pipe.

10. The refrigeration liquid supply control system according to claim 8, characterized in that: The control system further comprises a pressure gauge, a sight glass and a second stop valve, and the pressure gauge, the sight glass and the second stop valve are all mounted on the return air pipeline.

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