Refrigeration system and refrigeration conditioning method

Abstract

The application provides a refrigeration system and a refrigeration adjusting method. The system comprises a first function part providing a refrigeration function; and a second function part cooperating with the first function part to provide a frost inhibition function. The first function part comprises a compressor, a condensing assembly, a throttle valve and an evaporating assembly connected in sequence. The condensing assembly comprises a condenser, and the evaporating assembly comprises an evaporator. The second function part comprises an on-off control valve and a pressure regulating valve. An inlet of the on-off control valve is connected between an outlet of the compressor and an inlet of the condenser. An outlet of the on-off control valve is connected to an inlet of the pressure regulating valve. An outlet of the pressure regulating valve is connected between an outlet of the throttle valve and an inlet of the evaporator. When the evaporator has a frost inhibition requirement, the on-off control valve is controlled to be opened, and an opening degree of the pressure regulating valve is adjusted to adjust an evaporating pressure at an outlet of the evaporator to a first preset pressure. By adding a bypass pipeline and a pressure-controlled bypass valve, the evaporating pressure of the refrigeration system is adjusted, and stable frost inhibition can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, and in particular to a refrigeration system and a refrigeration adjustment method. BACKGROUND

[0002] At present, in the existing system, the refrigeration system usually comprises a compressor, a condenser, a throttling device and an evaporator, and the refrigeration of the controlled environment is realized through the circulation of the refrigerant.

[0003] In the process of implementing the present application, the inventors have found that at least the following problems exist in the prior art:

[0004] For a refrigeration system with a refrigeration temperature of 0-10℃, the evaporator temperature is lower than 0℃, and the evaporator coil is prone to frost formation, which can result in low refrigeration effect, increased energy consumption and reduced system reliability. SUMMARY

[0005] The present application provides a refrigeration system and a refrigeration adjustment method, which can improve the problem of low refrigeration effect, increased energy consumption and reduced system reliability caused by frost formation on the evaporator coil in the prior art.

[0006] In a first aspect, the present application provides a refrigeration system, comprising: a first functional part for providing a refrigeration function; a second functional part for providing a frost inhibition function in cooperation with the first functional part; the first functional part comprises a compressor, a condensing assembly, a throttling valve and an evaporating assembly connected in sequence to form a circulation loop, the condensing assembly comprises a condenser, and the evaporating assembly comprises an evaporator; the second functional part comprises an on-off control valve and a pressure regulating valve, the inlet of the on-off control valve is connected between the outlet of the compressor and the inlet of the condenser, the outlet of the on-off control valve is connected to the inlet of the pressure regulating valve, and the outlet of the pressure regulating valve is connected between the outlet of the throttling valve and the inlet of the evaporator; when it is determined that the evaporator has a frost inhibition requirement, the on-off control valve is controlled to be opened, and the opening degree of the pressure regulating valve is adjusted to adjust the evaporator outlet pressure to a first preset pressure.

[0007] In a possible implementation manner, the determination that the evaporator has a frost inhibition requirement comprises: acquiring a first temperature of the evaporator surface provided by an external device, and determining that the evaporator has a frost inhibition requirement when it is determined that the first temperature is less than a frost temperature; or acquiring an evaporator outlet pressure provided by an external device, and determining that the evaporator has a frost inhibition requirement when it is determined that the evaporator outlet pressure is inconsistent with the first preset pressure.

[0008] In a possible implementation, the adjusting the opening degree of the pressure regulating valve to adjust the evaporation pressure at the outlet of the evaporator to the first preset pressure comprises: obtaining the evaporation pressure at the outlet of the evaporator provided by an external device; if the evaporation pressure is less than the first preset pressure, increasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is raised to the first preset pressure; if the evaporation pressure is greater than the first preset pressure, decreasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is reduced to the first preset pressure.

[0009] In a possible implementation, when it is determined that the evaporator has a dehumidification requirement, the on-off control valve is controlled to be opened, and the opening degree of the pressure regulating valve is adjusted to adjust the evaporation pressure at the outlet of the evaporator to a second preset pressure.

[0010] In a possible implementation, the adjusting the opening degree of the pressure regulating valve to adjust the evaporation pressure at the outlet of the evaporator to the second preset pressure comprises: obtaining the evaporation pressure at the outlet of the evaporator provided by an external device; if the evaporation pressure is less than the second preset pressure, increasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is raised to the second preset pressure; if the evaporation pressure is greater than the second preset pressure, decreasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is reduced to the second preset pressure.

[0011] In a possible implementation, when it is determined that the evaporator has a dehumidification requirement and a frost inhibition requirement, the on-off control valve is controlled to be opened, and the opening degree of the pressure regulating valve is adjusted to control the evaporation pressure at the outlet of the evaporator to be within a preset pressure range.

[0012] In a possible implementation, the adjusting the opening degree of the pressure regulating valve to control the evaporation pressure at the outlet of the evaporator to be within the preset pressure range comprises: obtaining the evaporation pressure at the outlet of the evaporator provided by an external device; if the evaporation pressure is less than a minimum value of the preset pressure range, increasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is within the preset pressure range; if the evaporation pressure is greater than a maximum value of the preset pressure range, decreasing the opening degree of the pressure regulating valve until the evaporation pressure at the outlet of the evaporator is within the preset pressure range.

[0013] In a possible implementation, the refrigeration system further comprises a third functional part; the third functional part comprises a first temperature sensor and a pressure sensor, the first temperature sensor is arranged adjacent to the evaporator and is used to detect a first temperature of a surface of the evaporator, and the pressure sensor is arranged at an outlet position of the evaporator and is used to detect an evaporation pressure at the outlet of the evaporator.

[0014] In a possible implementation, the third function part further comprises: a second temperature sensor arranged at the air inlet of the evaporator, configured to detect the return air temperature of the evaporator; wherein, during the frosting inhibition process, after the evaporating pressure at the outlet of the evaporator is adjusted to the first preset pressure, if it is determined that the return air temperature is out of the working range of the frosting inhibition, the on-off control valve and the pressure regulating valve are closed, and the frosting inhibition process is ended.

[0015] During the dehumidification process, after the evaporating pressure at the outlet of the evaporator is adjusted to the second preset pressure, if it is determined that the return air temperature is out of the working range of the dehumidification, the on-off control valve and the pressure regulating valve are closed, and the dehumidification process is ended.

[0016] In a possible implementation, the third function part further comprises: a frosting inhibition indicator configured to light up when it is determined that the evaporator has the frosting inhibition demand, and to turn off when it is determined that the frosting inhibition process is ended; and a dehumidification indicator configured to light up when it is determined that the evaporator has the dehumidification demand, and to turn off when it is determined that the dehumidification process is ended.

[0017] In a second aspect, the present application provides a refrigeration adjustment method applied to a refrigeration system, the method comprising: when it is determined that an evaporator of the refrigeration system has a frosting inhibition demand, opening an on-off control valve of the refrigeration system, and adjusting the opening degree of a pressure regulating valve of the refrigeration system to adjust the evaporating pressure at the outlet of the evaporator to a first preset pressure; wherein, after the on-off control valve is opened and the opening degree of the pressure regulating valve is adjusted, the compressor output part of the refrigeration system is controlled to output refrigerant to the evaporator, and the frosting of the evaporator is inhibited.

[0018] In a possible implementation, the method further comprises: when it is determined that the evaporator has a dehumidification demand, opening the on-off control valve, and adjusting the opening degree of the pressure regulating valve to adjust the evaporating pressure at the outlet of the evaporator to a second preset pressure.

[0019] Compared with the prior art, the technical solution provided by the present application has at least the following beneficial effects:

[0020] By the technical scheme, a bypass pipeline and a bypass valve controlled by pressure are added to the original first function part of the refrigeration system, and the second function part can be specifically provided, the second function part includes an on-off control valve and a pressure regulating valve, an inlet of the on-off control valve is connected between an outlet of the compressor and an inlet of the condenser, an outlet of the on-off control valve is connected to an inlet of the pressure regulating valve, and an outlet of the pressure regulating valve is connected between an outlet of the throttling valve and an inlet of the evaporator; when it is determined that the evaporator has a demand for frost inhibition, the on-off control valve is controlled to be opened, and the opening degree of the pressure regulating valve is adjusted to control the evaporating pressure at the outlet of the evaporator to be within the first pressure range. Through the scheme, the gaseous refrigerant supplemented by the evaporator carries heat, the decrease of the superheat degree at the outlet of the evaporator can be stably inhibited, and therefore the trend of the decrease of the opening degree of the throttling valve can also be alleviated. When the frost layer on the surface of the evaporator grows to a certain extent, the surface temperature of the frost layer approaches the dew point of air and no more condensate water is generated, and the growth of the frost layer is stopped.

[0021] In summary, the refrigeration system provided by the application can stably inhibit the frosting of the evaporator, thereby improving the problems of low refrigeration effect, increased energy consumption and reduced system reliability caused by the frosting of the evaporating coil in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative labor.

[0023] Figure 1 The frosting inhibition scene flowchart provided by one embodiment of the application;

[0024] Figure 2 The structure diagram of the refrigeration system provided by one embodiment of the application;

[0025] Figure 3 The structure diagram of the refrigeration system provided by one embodiment of the application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the application more clear, the technical solutions in the embodiments of the application will be described clearly and completely in the following with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without any creative labor are within the protection scope of the application.

[0027] Figure 1 A frost inhibition scenario flowchart is provided for an embodiment of the present application.

[0028] Referring to Figure 1 As shown, during operation of the refrigeration system, the refrigerant evaporates in the evaporator, absorbing heat from the surroundings, thereby achieving a refrigeration effect. However, during the evaporating and heat-absorbing operation of the evaporator, when the evaporator surface temperature is lower than the air dew point temperature, condensation will occur on the evaporator surface. Since the evaporator surface temperature is relatively low, usually below 0°C, when the evaporating temperature is relatively low, frost will occur on the evaporator surface. If the frost on the evaporator surface is too thick, it will cause a large thermal resistance, affecting the heat exchange efficiency of the refrigeration system, causing a decrease in refrigeration capacity, leading to an increase in energy consumption of the refrigeration system, reducing the refrigeration reliability of the refrigeration system, and affecting the user experience.

[0029] Generally, when the evaporator surface frosting problem occurs, the evaporator needs to be treated by a corresponding frost inhibition strategy to solve the technical problems caused by frosting.

[0030] An embodiment of the present application provides a refrigeration system, which increases a bypass pipeline and a pressure-controlled bypass valve to adjust the evaporating pressure of the refrigeration system, so that the system can stably dehumidify or inhibit frosting. It can be understood that the refrigeration system can be applied to refrigerated trucks, refrigerators, cold storage, artificial environment test laboratories / working condition rooms, etc.

[0031] The refrigeration system and the frost inhibition strategy of the refrigeration system provided by the present application are described in detail below with reference to the accompanying drawings.

[0032] Figure 2 A structure diagram of the refrigeration system provided by an embodiment of the present application is provided.

[0033] Referring to Figure 2 As shown, the system can include:

[0034] A first functional part D1 for providing a refrigeration function.

[0035] A second functional part D2 for providing a frost inhibition function in cooperation with the first functional part D1.

[0036] The first functional part D1 can include a compressor 100, a condensing assembly 200, a throttling valve 300, and an evaporating assembly 400 connected in sequence to form a circulation loop. Referring to Figure 2 As shown, the compressor 100, the condensing assembly 200, the throttling valve 300, and the evaporating assembly 400 connected in sequence can be connected to form a refrigeration circulation loop.

[0037] In some embodiments, the condensing assembly 200 can include a condenser 201, and the evaporating assembly 400 can include an evaporator 401. It can be understood that the compressor 100, the condenser 201, the throttling valve 300, and the evaporator 401 are sequentially connected to form a circulating loop.

[0038] In some embodiments, the refrigeration cycle process of the first functional part D1 can include that the compressor 100 performs compression processing on the refrigerant, the compressed refrigerant enters the condenser 201 to be condensed and radiated, the condensed refrigerant enters the evaporator after being processed by the throttling valve 300 to be evaporated and absorbed heat, and the evaporated and heat-absorbed refrigerant returns to the compressor 100 to complete a refrigeration cycle. For example, low-temperature and low-pressure refrigerant vapor is compressed by the compressor 100 into high-temperature and high-pressure refrigerant vapor, then enters the condenser 201 and exchanges heat with the air of the external environment in the condenser, is condensed into high-pressure refrigerant liquid, and then enters the evaporator 401 after being throttled and decompressed by the throttling valve 300 to be cooled and refrigerated, is evaporated into low-temperature and low-pressure refrigerant vapor, and returns to the compressor 100 to complete a refrigeration cycle.

[0039] Referring to Figure 1 As shown in the figure, the second functional part D2 includes an on-off control valve 500 and a pressure regulating valve 600. The inlet of the on-off control valve 500 is connected between the outlet of the compressor 100 and the inlet of the condenser 201, the outlet of the on-off control valve 500 can be connected to the inlet of the pressure regulating valve 600, and the outlet of the pressure regulating valve 600 is connected between the outlet of the throttling valve and the inlet of the evaporator 401. For example, the on-off control valve 500 can be an electromagnetic valve, which can effectively control the on-off of the bypass path, that is, by controlling the opening or closing of the electromagnetic valve, whether the refrigerant discharged by the compressor 100 passes through the pressure regulating valve 600 can be controlled.

[0040] During the continuous refrigeration process of the refrigeration system, when the surface temperature of the evaporator 401 is lower than the dew point temperature of the air flowing through the surface of the evaporator 401, condensation water will continuously condense on the surface of the evaporator 401. The presence of condensation water increases the local heat exchange resistance of the evaporator 401 and increases the air flow resistance, which reduces the air volume, so that the heat exchange of the evaporator 401 becomes poor, and the superheat degree of the refrigerant at the outlet of the evaporator 401 becomes low. In some application scenarios, the opening degree of the throttling valve 300 of the refrigeration system is controlled by the superheat degree of the refrigerant at the outlet of the evaporator 401, and when the superheat degree is low, the opening degree of the throttling valve 300 is automatically reduced, which reduces the refrigerant flow, but the rotating speed of the compressor 100 remains unchanged, so that the suction volume remains unchanged, and the suction volume and the refrigeration capacity are not matched, which leads to a decrease in the evaporating pressure.

[0041] When the evaporating pressure is reduced to a certain extent, the surface temperature of the evaporator 401 is lower than a certain temperature (for example, 0°C), and the condensed water droplets / water film will freeze into frost by releasing heat. The surface of the frost will continue to produce condensed water, and thus the evaporator 401 surface will appear the following cycle: “condensed water → poor heat exchange → low superheat → reduced throttle valve opening → reduced evaporating pressure → condensed water freezing into frost → new condensed water”, thereby causing the circulating frost layer to become thicker and thicker, and further affecting the refrigeration effect of the refrigeration system.

[0042] In some embodiments, during the operation of the refrigeration system, it can be determined whether the evaporator 401 has a need for frost suppression, and if so, a frost suppression strategy can be executed based on the second function part D2.

[0043] Timing of detection of the need for frost suppression

[0044] In some embodiments, the refrigeration system can determine whether the evaporator 401 has a need for frost suppression by periodic detection, specifically, it can be determined whether the evaporator 401 has a need for frost suppression every first time interval after the refrigeration system starts operating, and the first time interval can be set based on user needs or actual application scenarios of the refrigeration system. By periodically determining whether the evaporator 401 has a need for frost suppression, the load power of the refrigeration system can be reduced, and the power consumption can be saved.

[0045] In another embodiment, the refrigeration system can also determine whether the evaporator 401 has a need for frost suppression by real-time monitoring, thereby improving the response efficiency of frost suppression and achieving rapid frost suppression.

[0046] In other embodiments, the refrigeration system can also determine whether the evaporator 401 has a need for frost suppression by other methods, for example, a user sets to detect whether the evaporator 401 has a need for frost suppression at a corresponding time based on historical frost time, and the application does not limit the method of determining whether the evaporator 401 has a need for frost suppression.

[0047] Method of detecting the need for frost suppression

[0048] (1) Based on temperature detection

[0049] In some embodiments, the refrigeration system can determine whether the evaporator 401 has a need for frost suppression based on the surface temperature of the evaporator 401. In one implementation, the refrigeration system can obtain a first temperature of the surface of the evaporator 401, and compare the first temperature with a frost temperature. When the first temperature is lower than the frost temperature, it is determined that the evaporator 401 has a need for frost suppression.

[0050] In some embodiments, the refrigeration system can obtain the first temperature of the evaporator 401 through an external device, so as to simplify the structure of the refrigeration system and reduce the cost of the refrigeration system.

[0051] In some embodiments, the frosting temperature for determining whether the evaporator 401 has the frosting suppression requirement can be a dynamic value, and specifically, the frosting temperature can be dynamically adjusted based on the refrigeration temperature of the evaporator 401 and the change of the ambient humidity near the evaporator 401.

[0052] (II) Based on the evaporating pressure detection

[0053] In some embodiments, the refrigeration system can determine whether the evaporator 401 has the frosting suppression requirement based on the evaporating pressure at the outlet of the evaporator 401. In one of the implementation manners, the refrigeration system can obtain the evaporating pressure p0 at the outlet of the evaporator 401, and compare the evaporating pressure p0 with the first preset pressure p1, and when the evaporating pressure p0 is inconsistent with the first preset pressure p1 (i.e., p0

[0054] In some embodiments, the refrigeration system can obtain the evaporating pressure p0 of the evaporator 401 through an external device, so as to simplify the structure of the refrigeration system and reduce the cost of the refrigeration system.

[0055] In some embodiments, when it is determined that the evaporator 401 has the frosting suppression requirement, the frosting suppression of the evaporator 401 can be realized by executing the frosting suppression strategy. Specifically, in one of the implementation manners, the frosting suppression strategy can include controlling the on-off control valve 500 to be opened and adjusting the opening degree of the pressure regulating valve 600, so as to control the evaporating pressure at the outlet of the evaporator 401 to be adjusted to the first preset pressure p1. That is, when it is determined that the evaporator 401 has the frosting suppression requirement, the on-off control valve 500 is controlled to be opened and the opening degree of the pressure regulating valve 600 is adjusted, so as to adjust the evaporating pressure at the outlet of the evaporator 401 to the first preset pressure p1.

[0056] In some embodiments, the determination that the evaporator 401 has the frosting suppression requirement includes:

[0057] obtaining the first temperature of the surface of the evaporator 401 provided by an external device, and when it is determined that the first temperature is less than the frosting temperature, it is determined that the evaporator 401 has the frosting suppression requirement; or

[0058] obtaining the evaporating pressure p0 at the outlet of the evaporator 401 provided by an external device, and when it is determined that the evaporating pressure p0 is inconsistent with the first preset pressure p1, it is determined that the evaporator 401 has the frosting suppression requirement.

[0059] In some embodiments, the opening degree of the pressure regulating valve 600 is adjusted to control the evaporation pressure at the outlet of the evaporator 401 to be within the first pressure range, i.e. the opening degree of the pressure regulating valve 600 is adjusted to adjust the evaporation pressure at the outlet of the evaporator 401 to the first preset pressure p1, including: obtaining the evaporation pressure p0 at the outlet of the evaporator 401 provided by an external device; if the evaporation pressure p0 is less than the first preset pressure p1 (i.e. p0 < p1), increasing the opening degree of the pressure regulating valve 600 until the evaporation pressure at the outlet of the evaporator 401 is raised to the first preset pressure; if the evaporation pressure p0 is greater than the first preset pressure (i.e. p0 > p1), decreasing the opening degree of the pressure regulating valve 600 until the evaporation pressure at the outlet of the evaporator 401 is reduced to the first preset pressure. Through the above adjustment mode, on the one hand, a part of gaseous refrigerant is supplemented to the evaporator, which can balance the flow mismatching problem between the throttling valve 300 and the compressor 100; on the other hand, the decrease of the superheat degree at the outlet of the evaporator 401 can be inhibited by the heat carried by the supplemented gaseous refrigerant, so that the trend of the decrease of the opening degree of the throttling valve 300 can also be alleviated.

[0060] In some embodiments, during the operation of the refrigeration system, it can be determined whether the evaporator 401 has a dehumidification requirement, and if the evaporator 401 has a dehumidification requirement, a dehumidification strategy can be executed based on the second function part D2.

[0061] In some embodiments, when it is determined that the evaporator 401 has a dehumidification requirement, the on-off control valve 500 is controlled to be opened, and the opening degree of the pressure regulating valve 600 is adjusted to adjust the evaporation pressure p0 at the outlet of the evaporator 401 to the second preset pressure p2 (p1 > p2).

[0062] In some embodiments, adjusting the opening degree of the pressure regulating valve 600 to adjust the evaporation pressure p0 at the outlet of the evaporator 401 to the second preset pressure p2 includes: obtaining the evaporation pressure p0 at the outlet of the evaporator 401 provided by an external device; if the evaporation pressure p0 is less than the second preset pressure p2, increasing the opening degree of the pressure regulating valve 600 until the evaporation pressure at the outlet of the evaporator 401 is raised to the second preset pressure; if the evaporation pressure p0 is greater than the second preset pressure p2, decreasing the opening degree of the pressure regulating valve 600 until the evaporation pressure at the outlet of the evaporator 401 is reduced to the second preset pressure.

[0063] In some embodiments, during the operation of the refrigeration system, it can be determined whether the evaporator 401 has a dehumidification requirement and a frost inhibition requirement, and if the evaporator 401 has a dehumidification requirement and a frost inhibition requirement, a frost inhibition and dehumidification strategy can be executed based on the second function part D2.

[0064] In some embodiments, when it is determined that the evaporator 401 has a dehumidification requirement and a frost inhibition requirement, the on-off control valve 500 is opened, and the opening degree of the pressure regulating valve 600 is adjusted to control the evaporating pressure at the outlet of the evaporator 401 to be within a preset pressure range.

[0065] In some embodiments, adjusting the opening degree of the pressure regulating valve 600 to control the evaporating pressure at the outlet of the evaporator 401 to be within a preset pressure range comprises: obtaining the evaporating pressure at the outlet of the evaporator 401 provided by an external device; if the evaporating pressure is less than the minimum value of the preset pressure range, increasing the opening degree of the pressure regulating valve 600 until the evaporating pressure at the outlet of the evaporator 401 is within the preset pressure range; if the evaporating pressure is greater than the maximum value of the preset pressure range, decreasing the opening degree of the pressure regulating valve 600 until the evaporating pressure at the outlet of the evaporator 401 is within the preset pressure range.

[0066] In some embodiments, the preset pressure range can be [p1, p2], i.e., the preset pressure range can be a range between a first preset pressure and a second preset pressure. When it is determined that the evaporator 401 has a dehumidification requirement and a frost inhibition requirement, the evaporating pressure p0 at the outlet of the evaporator 401 is obtained; if the evaporating pressure is less than the minimum value of the preset pressure range, i.e., p0 < p1, the opening degree of the pressure regulating valve 600 is increased until the evaporating pressure at the outlet of the evaporator 401 is within the preset pressure range [p1, p2]; if the evaporating pressure p0 is greater than the maximum value of the preset pressure range, i.e., p0 > p2, the opening degree of the pressure regulating valve 600 is decreased until the evaporating pressure at the outlet of the evaporator 401 is within the preset pressure range [p1, p2].

[0067] Figure 3 A structural schematic diagram of a refrigeration system is provided for an embodiment of the present application.

[0068] Referring to Figure 3 As shown in the figure, the refrigeration system can further include a third functional part, which can include a pressure sensor 700 and / or a first temperature sensor 800. The pressure sensor 700 can be arranged at the outlet position of the evaporator 401 to detect the evaporating pressure at the outlet of the evaporator 401, and the first temperature sensor 800 can be arranged adjacent to the evaporator 401 to detect the first temperature of the surface of the evaporator 401.

[0069] In some embodiments, when the third functional part only contains the first temperature sensor 800, whether the evaporator 401 has the need to inhibit frost formation can be determined based on the first temperature of the surface of the evaporator 401 provided by the first temperature sensor 800, wherein when it is determined that the first temperature is less than the frost formation temperature, it is determined that the evaporator 401 has the need to inhibit frost formation, and vice versa, when it is determined that the first temperature is not less than the frost formation temperature, it is determined that the evaporator 401 does not have the need to inhibit frost formation.

[0070] In some embodiments, when the third functional part only contains the first temperature sensor 800, when the frost formation inhibition strategy is executed, the evaporation pressure of the outlet of the evaporator 401 provided by the external device can be obtained, and when it is determined that the evaporator 401 has the need to inhibit frost formation, the on-off control valve 500 is controlled to be opened, and the opening degree of the pressure regulating valve 600 is adjusted, so that the evaporation pressure of the outlet of the evaporator 401 is adjusted to the first preset pressure. The specific adjustment mode of the pressure regulating valve 600 can include: obtaining the evaporation pressure p0 of the outlet of the evaporator 401 provided by the external device; if the evaporation pressure p0 is less than the first preset pressure p1 (i.e. p0 < p1), the opening degree of the pressure regulating valve 600 is increased until the evaporation pressure of the outlet of the evaporator 401 is increased to the first preset pressure; if the evaporation pressure p0 is greater than the first preset pressure (i.e. p0 > p1), the opening degree of the pressure regulating valve 600 is reduced until the evaporation pressure of the outlet of the evaporator 401 is reduced to the first pressure.

[0071] In some embodiments, when the third functional part only contains the pressure sensor 700, whether the evaporator 401 has the need to inhibit frost formation can be determined based on the evaporation pressure of the outlet of the evaporator 401 provided by the pressure sensor 700, wherein when it is determined that the evaporation pressure is inconsistent with the first preset pressure, it is determined that the evaporator 401 has the need to inhibit frost formation, and vice versa, when it is determined that the evaporation pressure is consistent with the first preset pressure, it is determined that the evaporator 401 does not have the need to inhibit frost formation.

[0072] In some embodiments, when the third functional part only includes the pressure sensor 700, in the execution of the anti-frosting strategy, the evaporating pressure of the evaporator outlet provided by the pressure sensor 700 can be acquired, and when it is determined that the evaporator 401 has the anti-frosting demand, the on-off control valve 500 is controlled to be opened, and the opening degree of the pressure regulating valve 600 is adjusted, so that the evaporating pressure of the evaporator 401 outlet is adjusted to the first preset pressure. The specific adjustment mode of the pressure regulating valve 600 can include: acquiring the evaporating pressure p0 of the evaporator 401 outlet provided by the pressure sensor 700; if the evaporating pressure p0 is less than the first preset pressure p1 (i.e. p0 < p1), the opening degree of the pressure regulating valve 600 is increased until the evaporating pressure of the evaporator 401 outlet is increased to the first preset pressure; if the evaporating pressure p0 is greater than the first preset pressure (i.e. p0 > p1), the opening degree of the pressure regulating valve 600 is decreased until the evaporating pressure of the evaporator 401 outlet is decreased to the first pressure.

[0073] In some embodiments, when the third functional part includes the pressure sensor 700 and the first temperature sensor 800, whether the evaporator 401 has the anti-frosting demand can be determined based on the first temperature of the evaporator 401 surface provided by the first temperature sensor 800, or based on the evaporating pressure of the evaporator 401 outlet provided by the pressure sensor 700. The specific implementation mode can be the same as or similar to the above-mentioned embodiments, which will not be described here.

[0074] In some embodiments, when the third functional part includes the pressure sensor 700 and the first temperature sensor 800, in the execution of the anti-frosting strategy, the evaporating pressure of the evaporator outlet provided by the pressure sensor 700 can be acquired, and when it is determined that the evaporator 401 has the anti-frosting demand, the on-off control valve 500 is controlled to be opened, and the opening degree of the pressure regulating valve 600 is adjusted, so that the evaporating pressure of the evaporator 401 outlet is adjusted to the first preset pressure. The specific adjustment mode of the pressure regulating valve 600 can include: acquiring the evaporating pressure p0 of the evaporator 401 outlet provided by the pressure sensor 700; if the evaporating pressure p0 is less than the first preset pressure p1 (i.e. p0 < p1), the opening degree of the pressure regulating valve 600 is increased until the evaporating pressure of the evaporator 401 outlet is increased to the first preset pressure; if the evaporating pressure p0 is greater than the first preset pressure (i.e. p0 > p1), the opening degree of the pressure regulating valve 600 is decreased until the evaporating pressure of the evaporator 401 outlet is decreased to the first preset pressure.

[0075] In some embodiments, the third functional part can further include a second temperature sensor, which can be arranged at the air inlet position of the evaporator 401, that is, the second temperature sensor can be arranged at the air inlet position of the evaporator 401, and is used for detecting the return air temperature of the evaporator 401.

[0076] If it is determined that the return air temperature exceeds the working range for suppressing frost formation after the opening of the pressure regulating valve 600 is adjusted to control the evaporation pressure at the outlet of the evaporator 401 to the first preset pressure, the on-off control valve 500 and the pressure regulating valve 600 are closed, and the process of suppressing frost formation is ended.

[0077] In some embodiments, the third functional part further comprises a frost suppression indicator light (or frost suppression indicator light) for being turned on when it is determined that the evaporator 401 has a demand for suppressing frost formation, and being turned off when it is determined that the process of suppressing frost formation is ended.

[0078] In some embodiments, the third functional part further comprises a dehumidification indicator light for being turned on when it is determined that the evaporator 401 has a demand for dehumidification, and being turned off when it is determined that the return air temperature is less than the minimum temperature of the first temperature range (for example, the interval of 0-10℃), that is, when it is determined that the process of dehumidification is ended.

[0079] The dehumidification function and the frost suppression function provided by the refrigeration system provided by the present application are described in detail below through specific embodiments.

[0080] When the ambient temperature enters the first temperature range (for example, the interval of 0-10℃), the evaporation temperature is lower than 0℃, and the basic condition for producing condensate water and freezing is met. The air dew point temperature > the evaporator surface temperature > 0℃, and the evaporator surface continuously condenses condensate water but does not form frost, so that stable dehumidification can be continuously maintained. In particular, by appropriately adjusting the value of the preset parameter p1, the evaporation pressure can be prevented from being too low, the dew point temperature in the cold room can be maintained to be not lower than the temperature value associated with the preset parameter p1, excessive dehumidification can be avoided, and the dry consumption of goods can be reduced.

[0081] When the dehumidification function is activated by the controller, if the return air temperature t of the evaporator 401 is ≥10℃, the dehumidification indicator light flashes, indicating that dehumidification has not started; when the return air temperature t of the evaporator satisfies 10℃>t>0℃, the dehumidification indicator light is always on, indicating that the dehumidification state is entered, and the on-off control valve 500 is opened; after the on-off control valve 500 is opened, the pressure sensor reading p is compared with the preset dehumidification parameter p1, and if p<p1, the opening of the pressure regulating valve 600 is increased, if p>p1, the opening of the pressure regulating valve 600 is decreased, and if p=p1, the current opening of the pressure regulating valve 600 is maintained; when the return air temperature t of the evaporator satisfies t≤0℃, the dehumidification indicator light is turned off, indicating that the dehumidification is completed or the current dehumidification entering condition is not met.

[0082] The dehumidification and frost suppression function is activated by the controller. If the return air temperature of the evaporator 401 is not suitable for dehumidification, the dehumidification indicator light flashes, indicating that dehumidification has not started. When the return air temperature t of the evaporator meets 10℃>t>0℃, the dehumidification indicator light is always on, indicating that the dehumidification state is entered, and the on-off control valve 500 is opened. After the on-off control valve 500 is opened, the pressure sensor reading p is compared with the preset dehumidification parameter p1. If p<p1, the opening of the pressure regulating valve 600 is increased. If p>p1, the opening of the pressure regulating valve 600 is decreased. If p=p1, the current opening of the pressure regulating valve 600 is maintained. When the return air temperature t of the evaporator meets t≤0℃, the dehumidification indicator light is turned off, indicating that dehumidification has been completed or the current conditions do not meet the dehumidification and frost suppression entry conditions.

[0083] The embodiment of the present application also provides a refrigeration adjustment method, which can include the following steps:

[0084] S101: When it is determined that the evaporator of the refrigeration system has a frost suppression requirement, the on-off control valve of the refrigeration system is opened, and the opening of the pressure regulating valve of the refrigeration system is adjusted to adjust the evaporating pressure at the outlet of the evaporator to a first preset pressure; wherein after the on-off control valve is opened and the opening of the pressure regulating valve of the refrigeration system is adjusted, the compressor of the refrigeration system outputs part of the refrigerant to the evaporator to suppress frosting of the evaporator.

[0085] In some embodiments, the method can further include the following steps:

[0086] S102: When it is determined that the evaporator has a dehumidification requirement, the on-off control valve is opened, and the opening of the pressure regulating valve is adjusted to adjust the evaporating pressure at the outlet of the evaporator to a second preset pressure.

[0087] It should be noted that the specific implementation of S101 and S012 in the refrigeration adjustment method provided by the embodiment of the present application can be the same as or similar to the implementation of the frost suppression process and the dehumidification process in the above refrigeration system, and will not be described here.

[0088] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, and will not be described here.

[0089] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiment is merely illustrative. For example, the division of the units is only a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0090] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0091] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of hardware plus software function units.

[0092] The integrated unit implemented in the form of software function units can be stored in a computer readable storage medium. The software function unit stored in the storage medium includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (Processor) to perform some steps of the method described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0093] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A refrigeration system characterized by, The system comprises: a first function part for providing refrigeration function; a second function part for providing frost inhibition function in cooperation with the first function part; the first function part comprises a compressor, a condensing assembly, a throttling valve and an evaporating assembly connected in sequence to form a circulation loop, the condensing assembly comprises a condenser, and the evaporating assembly comprises an evaporator; the second function part comprises an on-off control valve and a pressure regulating valve, an inlet of the on-off control valve is connected between an outlet of the compressor and an inlet of the condenser, an outlet of the on-off control valve is connected to an inlet of the pressure regulating valve, and an outlet of the pressure regulating valve is connected between an outlet of the throttling valve and an inlet of the evaporator; when it is determined that the evaporator has frost inhibition demand, the on-off control valve is controlled to be opened, and an opening degree of the pressure regulating valve is adjusted to adjust an evaporating pressure at an outlet of the evaporator to a first preset pressure; when it is determined that the evaporator has dehumidification demand, the on-off control valve is controlled to be opened, and the opening degree of the pressure regulating valve is adjusted to adjust the evaporating pressure at the outlet of the evaporator to a second preset pressure, the first preset pressure being greater than the second preset pressure; the refrigeration system further comprises a third function part; the third function part comprises: a second temperature sensor arranged at an air inlet position of the evaporator and used for detecting a return air temperature of the evaporator; in the frost inhibition process of adjusting the opening degree of the pressure regulating valve, after the evaporating pressure at the outlet of the evaporator is adjusted to the first preset pressure, if it is determined that the return air temperature exceeds a working range of the frost inhibition, the on-off control valve and the pressure regulating valve are closed, and the frost inhibition process is ended; in the dehumidification process of adjusting the opening degree of the pressure regulating valve, after the evaporating pressure at the outlet of the evaporator is adjusted to the second preset pressure, if it is determined that the return air temperature exceeds a working range of the dehumidification, the on-off control valve and the pressure regulating valve are closed, and the dehumidification process is ended.

2. The system of claim 1, wherein, the determination that the evaporator has frost inhibition demand comprises: acquiring a first temperature of a surface of the evaporator provided by an external device, and when it is determined that the first temperature is less than a frost temperature, it is determined that the evaporator has frost inhibition demand; or acquiring an evaporating pressure at an outlet of the evaporator provided by an external device, and when it is determined that the evaporating pressure is inconsistent with the first preset pressure, it is determined that the evaporator has frost inhibition demand.

3. The system of claim 2, wherein, the adjustment of the opening degree of the pressure regulating valve to adjust the evaporating pressure at the outlet of the evaporator to the first preset pressure comprises: acquiring the evaporating pressure at the outlet of the evaporator provided by an external device; if the evaporating pressure is less than the first preset pressure, the opening degree of the pressure regulating valve is increased until the evaporating pressure at the outlet of the evaporator is increased to the first preset pressure; if the evaporating pressure is greater than the first preset pressure, the opening degree of the pressure regulating valve is decreased until the evaporating pressure at the outlet of the evaporator is decreased to the first preset pressure.

4. The system of claim 1, wherein, the adjustment of the opening degree of the pressure regulating valve to adjust the evaporating pressure at the outlet of the evaporator to the second preset pressure comprises: acquiring the evaporating pressure at the outlet of the evaporator provided by an external device; If the evaporation pressure is less than the second preset pressure, the opening of the pressure regulating valve is increased until the evaporation pressure at the outlet of the evaporator is raised to the second preset pressure. If the evaporation pressure is greater than the second preset pressure, the opening of the pressure regulating valve is decreased until the evaporation pressure at the outlet of the evaporator is reduced to the second preset pressure.

5. The system of claim 1, wherein, When it is determined that the evaporator has a dehumidification demand and a frost suppression demand, the on-off control valve is controlled to be opened, and the opening of the pressure regulating valve is adjusted to control the evaporation pressure at the outlet of the evaporator to be within a preset pressure range.

6. The system of claim 1, wherein, The adjusting of the opening of the pressure regulating valve to control the evaporation pressure at the outlet of the evaporator to be within a preset pressure range comprises: obtaining the evaporation pressure at the outlet of the evaporator provided by an external device; If the evaporation pressure is less than the minimum value of the preset pressure range, the opening of the pressure regulating valve is increased until the evaporation pressure at the outlet of the evaporator is within the preset pressure range. If the evaporation pressure is greater than the maximum value of the preset pressure range, the opening of the pressure regulating valve is decreased until the evaporation pressure at the outlet of the evaporator is within the preset pressure range.

7. The system of claim 5, wherein, The third functional part comprises a first temperature sensor and a pressure sensor, the first temperature sensor is arranged adjacent to the evaporator and is used to detect a first temperature of the surface of the evaporator, and the pressure sensor is arranged at the outlet position of the evaporator and is used to detect the evaporation pressure at the outlet of the evaporator.

8. The system of claim 1, wherein, The third functional part further comprises: a frost suppression indicator lamp for being turned on when it is determined that the evaporator has a frost suppression demand and being turned off after the frost suppression treatment is determined to be ended; a dehumidification indicator lamp for being turned on when it is determined that the evaporator has a dehumidification demand and being turned off after the dehumidification treatment is determined to be ended.

9. A refrigeration conditioning method characterized by, The method is applied to the refrigeration system as claimed in any one of claims 1 to 8, and the method comprises: When it is determined that the evaporator of the refrigeration system has a frost suppression demand, the on-off control valve of the refrigeration system is controlled to be opened, and the opening of the pressure regulating valve of the refrigeration system is adjusted to adjust the evaporation pressure at the outlet of the evaporator to a first preset pressure. After the on-off control valve is opened and the opening of the pressure regulating valve of the refrigeration system is adjusted, the compressor output part of the refrigeration system is controlled to output refrigerant to the evaporator to suppress the frosting of the evaporator.

10. The method of claim 9, wherein, The method further comprises: When it is determined that the evaporator has a dehumidification demand, the on-off control valve is controlled to be opened, and the opening of the pressure regulating valve is adjusted to adjust the evaporation pressure at the outlet of the evaporator to a second preset pressure.

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