Refrigerating system and control method

Abstract

The invention provides a refrigerating system and a control method, and relates to the technical field of air conditioners. The refrigerating system comprises a main loop, a frequency converter, a temperature sensor and a heat dissipation loop. The main loop comprises a condenser and an evaporator; the temperature of the frequency converter is set as a first temperature Tp; the temperature sensor is connected to the frequency converter and used for measuring the first temperature Tp. The heat dissipation loop is communicated between the evaporator and the condenser, the heat dissipation loop is provided with a frequency converter and a control valve connected to the frequency converter, the control valve is located on the side close to the condenser, an input port of the control valve is communicated with an output port of the condenser, and the control valve is configured to adjust the opening degree of the control valve in response to the first temperature Tp. The heat dissipation loop is arranged between the evaporator and the condenser, and part of refrigerant cooled by the condenser can be used for cooling the frequency converter. The opening degree of the control valve is adjusted according to the first temperature so as to ensure the heat exchange efficiency, the overall size is small, the heat dissipation loop is simple in design, and cost reduction is facilitated.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a refrigeration system and a control method. Background Art

[0002] Evaporative cooling chillers use variable frequency compressors, which can achieve energy saving through intermittent start-up control under low load conditions. Among them, the variable frequency compressor includes a frequency converter, which will emit a large amount of heat during operation. If the heat is not dissipated in time, it will affect the normal operation of the frequency converter. In related technologies, air cooling and water cooling are usually used to dissipate heat from the frequency converter, but the heat exchange efficiency of air cooling is low, and an air filter needs to be installed, which is not conducive to reducing costs; the water cooling method requires multiple water channels to be set in the radiator inside the frequency converter, and water is circulated by installing a water pump to bring the heat to the outside and dissipate it into the atmosphere through the cooling tower. The system is complex, costly, and large in size. Summary of the invention

[0003] Based on this, it is necessary to provide a refrigeration system and a control method that can ensure the heat exchange efficiency of the inverter heat dissipation, and the heat dissipation method is simple, low cost and small size.

[0004] A refrigeration system is used for year-round refrigeration, and has a main circuit, wherein the main circuit includes a condenser and an evaporator, and the refrigeration system also includes a frequency converter, a temperature sensor and a heat dissipation circuit; the temperature of the frequency converter is set to a first temperature Tp; the temperature sensor is connected to the frequency converter and is used to measure the first temperature Tp; the heat dissipation circuit is connected between the evaporator and the condenser, and the heat dissipation circuit is provided with the frequency converter and a control valve connected to the frequency converter, the control valve is located on a side close to the condenser, and the input port of the control valve is connected to the output port of the condenser, and the control valve is configured to adjust its own opening in response to the first temperature Tp.

[0005] It is understandable that a heat dissipation circuit is provided between the evaporator and the condenser, so that part of the refrigerant after cooling by the condenser can be used to cool the inverter, and then flow back to the main circuit for refrigeration cycle after cooling the inverter, achieving a dual purpose. The temperature of the inverter can be measured by setting a temperature sensor, and the control valve is adjusted according to the measured temperature to control the refrigerant flow, achieve more accurate heat exchange, ensure heat exchange efficiency, and the overall volume is small, the heat dissipation circuit design is simple and not cumbersome, which is conducive to reducing costs.

[0006] In one embodiment, the pipe diameter d of the heat dissipation circuit accounts for 20%-40% of the pipe diameter D of the main circuit.

[0007] It is understandable that the pipe diameter of the heat dissipation circuit is small to control the flow of refrigerant input into the heat dissipation circuit and reduce the risk of condensation.

[0008] In one of the embodiments, under the condition of Tb-1≤Tp≤Tb+1, the opening of the control valve accounts for 45%-55% of the maximum opening of the control valve, wherein Tb is the target temperature of the inverter.

[0009] It is understandable that within the target temperature range, the opening of the control valve is moderate to reduce the risk of condensation.

[0010] A control method is used to control the above-mentioned refrigeration system, and the control method includes the following steps: obtaining a first temperature Tp of the inverter; comparing the first temperature Tp with a target temperature Tb; and adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the target temperature Tb.

[0011] It is understandable that the opening of the control valve is adjusted according to the temperature of the inverter, thereby controlling the flow of refrigerant used to dissipate heat for the inverter, so as to achieve precise adjustment of the heat dissipation of the inverter.

[0012] In one of the embodiments, adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the target temperature Tb includes: when Tp<Tb-1, reducing the opening of the control valve; when Tb-1≤Tp≤Tb+1, keeping the opening of the control valve unchanged; when Tp>Tb+1, increasing the opening of the control valve.

[0013] It can be understood that comparing the temperature of the frequency converter with a specific target temperature range makes the adjustment of the control valve more precise.

[0014] In one of the embodiments, before adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further includes: comparing the first temperature Tp with a reference temperature Ta, and adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the reference temperature Ta; wherein Ta>Tb+1.

[0015] It is understandable that adjusting the control valve according to the reference temperature is conducive to achieving precise adjustment of efficiency according to different temperatures.

[0016] In one embodiment, adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the reference temperature Ta includes: when Tp≤Ta, the control valve adjusts the opening with a first adjustment amplitude K1; when Tp>Ta, the control valve adjusts the opening with a second adjustment amplitude K2; wherein K1<K2.

[0017] It can be understood that by selecting different adjustment ranges according to different temperatures, the adjustment range of the control valve can be more numerical and specific, which is conducive to improving the adjustment efficiency.

[0018] In one embodiment, adjusting the opening of the control valve according to the comparison result of the first temperature Tp and the reference temperature Ta includes: when Tp≤Ta, the control valve adjusts the opening at a first time interval t1; when Tp>Ta, the control valve adjusts the opening at a second time interval t2; wherein t1>t2.

[0019] It can be understood that by selecting different interval times according to different temperatures, the adjustment interval time of the control valve can be more numerical and specific, which is conducive to improving the adjustment efficiency.

[0020] In one embodiment, adjusting the opening of the control valve according to the comparison result of the first temperature Tp and the reference temperature Ta includes: when Tp≤Ta, the control valve adjusts the opening with a first adjustment amplitude K1 at a first time interval t1; when Tp>Ta, the control valve adjusts the opening with a second adjustment amplitude K2 at a second time interval t2; wherein, K1<K2, t1>t2.

[0021] It is understandable that such a setting combines the interval time and the adjustment amplitude, which can further improve the efficiency of the adjustment.

[0022] In one embodiment, when Tp<Tb-1, reducing the opening of the control valve (22) includes: the control valve (22) reduces the opening at a first time interval t1 with a first adjustment amplitude K1; when Tp>Tb+1, increasing the opening of the control valve (22) includes: when Tb+1<Tp≤Ta, the control valve (22) increases the opening at a first time interval t1 with a first adjustment amplitude K1; when Tp>Ta, the control valve (22) increases the opening at a second time interval t2 with a second adjustment amplitude K2; wherein Ta>Tb+1, K1<K2, t1>t2.

[0023] It is understandable that adjusting with different adjustment amplitudes and intervals according to different temperature ranges is conducive to improving the adjustment efficiency.

[0024] In one embodiment, before obtaining the first temperature Tp of the inverter, the control method further includes adjusting the opening of the control valve to an initial opening; and / or, after adjusting the opening of the control valve according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further includes re-obtaining the first temperature Tp after a third time t3 to perform a control cycle.

[0025] It is understandable that the initial opening is set so that the control valve has a certain margin so that the opening can be increased or decreased. The third time is set so as to timely detect the temperature of the frequency converter and dissipate heat in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 Schematic diagram of the refrigeration system provided for this application;

[0028] Figure 2 This is a flow chart of the refrigeration system control method provided in this application.

[0029] Figure numerals: 100, refrigeration system; 10, main circuit; 20, heat dissipation circuit; 11, compressor; 12, condenser; 13, evaporator; 14, throttling element; 15, oil separator; 21, inverter; 22, control valve; 30, temperature sensor. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0035] See also Figure 1 The present application provides a refrigeration system 100 for year-round refrigeration, the refrigeration system 100 having a main circuit 10, the main circuit 10 including a compressor 11, a condenser 12 and an evaporator 13 that are interconnected, the refrigeration system 100 also including a frequency converter 21, a temperature sensor 30 and a heat dissipation circuit 20; the temperature of the frequency converter 21 is set to a first temperature Tp; the temperature sensor 30 is connected to the frequency converter 21, and is used to measure the first temperature Tp; the heat dissipation circuit 20 is connected between the evaporator 13 and the condenser 12, the heat dissipation circuit 20 is provided with a frequency converter 21 and a control valve 22 connected to the frequency converter 21, the control valve 22 is located on a side close to the condenser 12, and the input port of the control valve 22 is connected to the output port of the condenser 12, and the control valve 22 is configured to adjust its own opening in response to the first temperature Tp.

[0036] In this way, the main circuit 10 performs a refrigeration cycle to meet the refrigeration demand. Specifically, the compressor 11 compresses the refrigerant into a high-temperature and high-pressure gas and transports it to the condenser 12. The refrigerant becomes a medium-temperature liquid after heat exchange in the condenser 12. After throttling and reducing the pressure by the throttling element 14, it becomes a low-temperature and low-pressure liquid and enters the evaporator 13. After absorbing the heat from the external environment, it becomes a medium-temperature gaseous refrigerant and is sucked back into the compressor 11. In this process, the inverter 21 can control the frequency of the compressor 11 according to the load requirements to achieve energy-saving effects. Furthermore, when the temperature of the inverter 21 is high, the heat dissipation circuit 20 can dissipate the heat of the inverter 21, so as to promote the stable operation of the inverter 21. Specifically, the heat dissipation circuit 20 is arranged between the condenser 12 and the evaporator 13, and part of the refrigerant after heat exchange in the condenser 12 can be input into the heat dissipation circuit 20 to dissipate heat for the inverter 21. The refrigerant after absorbing the heat of the inverter 21 is then merged with the refrigerant in the main circuit 10, and flows into the evaporator 13 together for refrigeration cycle, achieving the effect of serving two purposes. In this process, the temperature sensor 30 can detect the temperature of the inverter 21 in real time, and the control valve 22 can control its own opening according to the temperature signal of the temperature sensor 30, and then control the refrigerant flow rate flowing into the heat dissipation circuit 20, so that the temperature of the inverter 21 meets the preset temperature, ensuring the heat dissipation efficiency. The entire heat dissipation circuit 20 is simple, and the overall volume is small, which is conducive to reducing costs.

[0037] It should be noted that the inverter 21 is provided with a circulation channel for the refrigerant and a cold plate capable of conducting heat from the inverter 21, the circulation channel is provided on the cold plate or close to the cold plate, and the temperature sensor 30 can indicate the first temperature of the inverter 21 by detecting the temperature of the cold plate. In the actual working process, the refrigeration system 100 further includes a controller connected to the temperature sensor 30 and the control valve 22, the temperature sensor 30 acquires the first temperature Tp, and transmits the temperature signal of the first temperature Tp to the controller, and the controller converts the temperature signal into an electrical signal instruction and transmits it to the control valve 22, thereby adjusting the opening of the control valve 22 accordingly.

[0038] In an optional embodiment, the pipe diameter d of the heat dissipation circuit 20 accounts for 20%-40% of the pipe diameter D of the main circuit 10. The pipe diameter d of the heat dissipation circuit 20 refers to the pipe diameter d of the pipe connected to the control valve 22, and the pipe diameter D of the main circuit 10 refers to the pipe diameter of the pipe connected to the throttling element 14 in the main circuit 10. The throttling element 14 can use an expansion valve, a capillary tube, etc. In this way, the pipe diameter of the heat dissipation circuit 20 is small, so that the refrigerant flowing into the heat dissipation circuit 20 is relatively limited, so that the refrigerant after the heat dissipation of the inverter 21 merges with the refrigerant in the main circuit 10, and the influence on the refrigeration cycle of the main circuit 10 is small, ensuring that the heat absorption effect of the refrigerant in the evaporator 13 can be met, and the cooling capacity is ensured. At the same time, it is conducive to the appropriate amount of refrigerant to dissipate heat to the inverter 21, so as not to cause the temperature of the inverter 21 to drop suddenly, and to prevent the water vapor in the surrounding air from encountering the suddenly cooled inverter 21 and condensing into dew on the surface of the inverter 21, thereby preventing the influence of condensation on the structure of the inverter 21. In a specific embodiment, the pipe diameter d of the heat dissipation loop 20 accounts for 20%, 30% or 40% of the pipe diameter D of the main loop 10 .

[0039] It should be added that the suitable operating temperature range of the inverter 21 is defined as Tc-Ta, where Tc and Ta are reference temperatures, and Ta>Tc. In the embodiment of the present application, Tb-1≤Tp≤Tb+1 is used as the target temperature range of the inverter 21, where Tb=(Tc+Ta) / 2. This setting allows the inverter 21 to be maintained at a suitable temperature, avoiding the inverter 21 from heating up to an unsuitable temperature due to the target temperature being close to Ta, and also avoiding the situation where the surface temperature of the inverter 21 is low and condensation is easily generated due to the target temperature approaching Tc. Exemplarily, the suitable temperature range of the inverter 21 is 20℃-40℃, that is, Tc=20Tc, Ta=40℃, and the target temperature Tb=30℃. In actual working conditions, the suitable temperature range and target temperature of the inverter 21 can be set according to different needs.

[0040] In an optional embodiment, under the condition of Tb-1≤Tp≤Tb+1, the opening of the control valve 22 accounts for 45%-55% of the maximum opening of the control valve 22. That is, when the frequency converter 21 is in the target temperature range, the opening of the control valve 22 is 45%-55% of its maximum opening. Under the condition of a constant refrigerant flow rate, the refrigerant flow in the heat dissipation circuit 20 is proportional to the cross-sectional area of ​​the pipeline of the heat dissipation circuit 20. At this time, when the control valve 22 is fully opened, the refrigerant flow is the largest, and the entire heat dissipation pipeline is filled with refrigerant. When the opening of the control valve 22 is 45%-55% of its maximum opening, the corresponding refrigerant flow is 45%-55% of the maximum refrigerant flow, and the cross-sectional area of ​​the pipeline used to pass the refrigerant accounts for 45%-55% of the cross-sectional area of ​​the pipeline. This arrangement allows the pipe diameter of the heat dissipation circuit 20 to be moderate, so that when the inverter 21 is heated up or cooled down and the control valve 22 is correspondingly adjusted to increase or decrease the opening, the pipe cross section has sufficient margin for adjusting the opening of the control valve 22. Exemplarily, when the opening of the control valve 22 is adjusted to a smaller size, the cross-sectional area of ​​the pipe for passing the refrigerant can be reduced. At the same time, an appropriate amount of refrigerant can dissipate heat for the inverter 21, so that the inverter 21 is kept within the target temperature range, and the temperature of the inverter 21 can be prevented from cooling suddenly. In a specific embodiment, under the state of Tb-1≤Tp≤Tb+1, the opening of the control valve 22 accounts for 45%, 50% or 55% of the maximum opening of the control valve 22.

[0041] In some embodiments, the control valve 22 in the heat dissipation circuit 20 can use an electronic expansion valve, which is conducive to throttling and reducing the pressure of the refrigerant while adjusting the opening, so that the refrigerant temperature is further reduced, and it is conducive to forming a pressure difference to promote the flow of refrigerant, so that the pressure of the refrigerant flowing into the evaporator 13 from the heat dissipation circuit 20 is relatively consistent with the pressure of the refrigerant flowing into the evaporator 13 from the main circuit 10, which is conducive to the refrigerant returning to the main circuit 10 to continue the refrigeration cycle after dissipating the heat to the inverter 21.

[0042] In some embodiments, the refrigeration system 100 includes an oil separator 15, which is connected between the output port of the compressor 11 and the input port of the condenser 12. It can separate the oil in the refrigerant from the refrigerant, which is beneficial to improving the heat exchange efficiency of the refrigerant, and allows the oil to return to the compressor 11 in time for lubrication, which is beneficial to the normal operation of the compressor 11.

[0043] See also Figure 2 The present application also provides a control method for controlling the above-mentioned refrigeration system 100, and the control method includes the following steps: obtaining a first temperature Tp of the inverter 21; comparing the first temperature Tp with the target temperature Tb; and adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the target temperature Tb.

[0044] In this way, the adjustment of the first temperature Tp is more targeted. By comparison, the difference between the first temperature Tp and the target temperature Tb is obvious, and the adjustment of the opening of the control valve 22 is also more specific and precise, which is conducive to the first temperature Tp approaching the target temperature Tb and avoiding condensation caused by a sudden drop in the first temperature Tp.

[0045] like Figure 2 As shown, before obtaining the first temperature Tp of the inverter 21, such as when the refrigeration system 100 is started, the control method also includes adjusting the opening of the control valve 22 to an initial opening so that when the first temperature Tp changes subsequently, the control valve 22 has a margin for opening adjustment.

[0046] In an optional embodiment, before adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further includes: comparing the first temperature Tp with the reference temperature Ta, and adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the reference temperature Ta, wherein Ta>Tb+1. In this way, the reference temperature Ta is used as the upper limit of the suitable temperature of the inverter 21, and the first temperature Tp is compared with the reference temperature Ta to determine whether the first temperature Tp is too high, and then a suitable adjustment range or interval time is selected to achieve accurate and rapid adjustment.

[0047] like Figure 2 As shown, in a specific embodiment, adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the reference temperature Ta includes: when Tp≤Ta, the control valve 22 adjusts the opening with the first adjustment amplitude K1; when Tp>Ta, the control valve 22 increases the opening with the second adjustment amplitude K2; wherein, K1<K2. In this way, when Tp≤Ta, it indicates that the first temperature Tp is not too high. Under the condition of a certain adjustment frequency, the opening of the control valve 22 is adjusted with a smaller adjustment amplitude, so that the inverter 21 gradually reaches the target temperature range. When Tp>Ta, it indicates that the first temperature Tp is too high. Under the condition of a certain adjustment frequency, the opening of the control valve 22 is adjusted with a larger adjustment amplitude, so that the refrigerant flow rate increases at a faster rate, which is conducive to the rapid cooling of the inverter 21.

[0048] like Figure 2As shown, in a specific embodiment, adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the reference temperature Ta includes: when Tp≤Ta, the control valve 22 adjusts the opening at a first time interval t1; when Tp>Ta, the control valve 22 increases the opening at a second time interval t2; wherein, t1>t2. In this way, when Tp≤Ta, it indicates that the first temperature Tp is not too high. Under the condition of a certain single adjustment amplitude, the opening of the control valve 22 is adjusted at a longer interval so that the frequency of adjustment is more moderate, so that the inverter 21 gradually reaches the target temperature range. When Tp>Ta, it indicates that the first temperature Tp is too high. Under the condition of a certain single adjustment amplitude, the opening of the control valve 22 is adjusted at a shorter interval so that the frequency of adjustment is higher, so that the refrigerant flow rate increases at a faster rate, which is conducive to the rapid cooling of the inverter 21.

[0049] Of course, as other embodiments, the interval time and amplitude can also be adjusted simultaneously according to the comparison result between the first temperature Tp and the reference temperature Ta. Specifically, when Tp≤Ta, the control valve 22 is adjusted to open at the first time interval t1 with the first adjustment amplitude K1; when TP>Ta, the control valve 22 is adjusted to open at the second time interval t2 with the second adjustment amplitude K2. In this way, when the temperature is not high, the control valve 22 is adjusted at a longer interval and the adjustment amplitude is smaller each time, so as to achieve a more gradual and stable adjustment, so that the temperature of the inverter 21 gradually approaches the target temperature. When the temperature is high, the control valve 22 is adjusted at a shorter interval and the adjustment amplitude is larger each time, so as to further promote the rapid cooling of the inverter 21.

[0050] For example, the total stroke of the control valve 22 is 500 steps, K1 = 10 steps, K2 = 30 steps, t1 = 10s, t2 = 5s. When Tp ≤ Ta, the control valve 22 is adjusted every 10s, and each time it is adjusted up or down by 10 steps; when Tp > Ta, the control valve 22 is adjusted every 5s, and each time it is adjusted up by 20 steps. The specific values ​​of K1, K2, t1 and t2 can be selected according to actual conditions, and are only used as examples here.

[0051] like Figure 2As shown, in an optional embodiment, adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the target temperature Tb includes: when Tp<Tb-1, reducing the opening of the control valve 22; when Tb-1≤Tp≤Tb+1, keeping the opening of the control valve 22 unchanged; when Tp>Tb+1, increasing the opening of the control valve 22. In this way, when Tp<Tb-1, it indicates that the first temperature Tp is low and condensation is easy to occur. Therefore, reducing the opening of the control valve 22 at this time can reduce the refrigerant flow rate, which is conducive to raising the first temperature Tp to the target temperature range. When Tp>Tb+1, it indicates that the first temperature Tp is high. Therefore, increasing the opening of the control valve 22 at this time is conducive to increasing the refrigerant flow rate to enhance the heat dissipation effect of the inverter 21.

[0052] In a specific embodiment, when Tp<Tb-1, reducing the opening of the control valve 22 can be specifically that the control valve 22 reduces the opening at a first time interval t1 with a first adjustment range K1; when Tp>Tb+1, there are two specific cases. When Tb+1<Tp≤Ta, increasing the opening of the control valve 22 can be specifically that the control valve 22 increases the opening at a first time interval t1 with a first adjustment range K1; when Tp>Ta, it indicates that the first temperature Tp is too high, and at this time, increasing the opening of the control valve 22 can be specifically that the control valve 22 increases the opening at a second time interval t2 with a second adjustment range K2. In this way, accurate and rapid regulation can be achieved.

[0053] like Figure 2 As shown, in one embodiment, after adjusting the opening of the control valve 22 according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further includes re-obtaining the first temperature Tp after a third time t3 and performing a control cycle. In this way, after the third time t3, the level of the first temperature Tp can be re-judged, which is conducive to timely adjusting the opening of the control valve 22, achieving accurate and rapid adjustment, and controlling the inverter 21 within a reasonable operating temperature range.

[0054] The various technical features or technical solutions of the above-mentioned embodiments can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various 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.

[0055] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A refrigeration system for year-round refrigeration, having a main circuit, the main circuit comprising a condenser and an evaporator, characterized in that: The refrigeration system further comprises: A frequency converter (21), wherein the temperature of the frequency converter (21) is set to a first temperature Tp; A temperature sensor (30), connected to the frequency converter (21), for measuring the first temperature Tp; A heat dissipation circuit (20) is connected between the evaporator (13) and the condenser (12). The heat dissipation circuit (20) is provided with the inverter (21) and a control valve (22) connected to the inverter (21). The control valve (22) is located on a side close to the condenser (12), and an input port of the control valve (22) is connected to an output port of the condenser (12). The control valve (22) is configured to adjust its own opening degree in response to the first temperature Tp.

2. The refrigeration system according to claim 1, characterized in that: The pipe diameter d of the heat dissipation circuit (20) accounts for 20%-40% of the pipe diameter D of the main circuit (10).

3. The refrigeration system according to claim 2, characterized in that: In the state of Tb-1≤Tp≤Tb+1, the opening of the control valve (22) accounts for 45%-55% of the maximum opening of the control valve (22), wherein Tb is the target temperature of the inverter (21).

4. A control method, characterized in that: Used to control the refrigeration system according to any one of claims 1 to 3, the control method comprises the following steps: Acquiring a first temperature Tp of the frequency converter (21); comparing the first temperature Tp with a target temperature Tb; The opening degree of the control valve (22) is adjusted according to the comparison result between the first temperature Tp and the target temperature Tb.

5. The control method according to claim 4, characterized in that: The step of adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the target temperature Tb comprises: When Tp<Tb-1, reducing the opening of the control valve (22); When Tb-1≤Tp≤Tb+1, the opening of the control valve (22) is kept unchanged; When Tp>Tb+1, the opening of the control valve (22) is increased.

6. The control method according to claim 5, characterized in that: Before adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further comprises: comparing the first temperature Tp with a reference temperature Ta, and adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the reference temperature Ta; wherein Ta>Tb+1.

7. The control method according to claim 6, characterized in that: The step of adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the reference temperature Ta comprises: When Tp≤Ta, the control valve (22) adjusts the opening degree with a first adjustment range K1; When Tp>Ta, the control valve (22) adjusts the opening degree with a second adjustment range K2; Among them, K1<K2.

8. The control method according to claim 6, characterized in that: The step of adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the reference temperature Ta comprises: When Tp≤Ta, the control valve (22) adjusts the opening degree at a first time interval t1; When Tp>Ta, the control valve (22) adjusts the opening degree at a second time interval t2; Among them, t1>t2.

9. The control method according to claim 6, characterized in that: The step of adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the reference temperature Ta comprises: When Tp≤Ta, the control valve (22) adjusts the opening degree at a first adjustment range K1 at a first time interval t1; When Tp>Ta, the control valve (22) adjusts the opening degree at a second adjustment range K2 at a second time interval t2; Among them, K1<K2, t1>t2.

10. The control method according to claim 5, characterized in that: When Tp<Tb-1, reducing the opening of the control valve (22) comprises: the control valve (22) reduces the opening at a first adjustment amplitude K1 at a first time interval t1; When Tp>Tb+1, increasing the opening of the control valve (22) includes: when Tb+1<Tp≤Ta, the control valve (22) increases the opening at a first adjustment amplitude K1 at a first time interval t1; When Tp>Ta, the control valve (22) increases its opening degree at a second adjustment amplitude K2 at a second time interval t2; Among them, Ta>Tb+1, K1<K2, t1>t2.

11. The control method according to claim 5, characterized in that: Before obtaining the first temperature Tp of the frequency converter (21), the control method further comprises adjusting the opening of the control valve (22) to an initial opening; and / or, after adjusting the opening of the control valve (22) according to the comparison result between the first temperature Tp and the target temperature Tb, the control method further comprises re-obtaining the first temperature Tp after a third time t3 to perform a control cycle.

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