CN104879941A - Refrigerator refrigeration circulating system, condensation prevention control method and refrigerator - Google Patents

Abstract

The invention discloses a refrigerator refrigerating cycle system, which comprises a compressor, a condenser, a first throttling device and a refrigerating evaporator connected end to end in sequence to form a refrigerant circulation loop, and the refrigerant flow where the first throttling device and the refrigerating evaporator are located The first flow path is the first flow path, and the refrigeration cycle system of the refrigerator also includes a humidity sensor, a three-way control valve, a second throttling device and an auxiliary refrigeration evaporator connected in sequence to form the second flow path, and the first flow path and the second flow path are arranged in parallel The first parallel node and the second parallel node are formed along the direction of refrigerant flow. The three-way control valve is set at the first parallel node. When the humidity detected by the humidity sensor is greater than the preset threshold, the three-way control valve selects at least Through the second flow path. The invention also discloses an anti-condensation control method and a refrigerator. By using the frosting effect of the auxiliary refrigeration evaporator, not only the condensation phenomenon is reduced, but also the refrigeration effect of the refrigeration room is guaranteed.

Description

Refrigeration cycle system of refrigerator, anti-condensation control method and refrigerator

technical field

The invention relates to the technical field of refrigeration, in particular to a refrigerator refrigeration cycle system, an anti-condensation control method and a refrigerator.

Background technique

The temperature difference between the inside and outside of the refrigerator compartment is large. After the water vapor in the environment enters the refrigerator compartment, the water vapor rises to the top of the refrigerator tank due to the temperature difference and condensation occurs. The condensation will not only absorb the moisture in the air Dust and bacteria, and will cause corrosion and rust of internal metal parts, moldy and smelly plastic parts, etc., which is not conducive to food preservation.

At present, anti-condensation pipes and electric heating components are mainly used to prevent condensation, but high-temperature heating will affect the cooling effect of the refrigerator compartment, resulting in an increase in heat load and temperature fluctuations, which is not conducive to food preservation.

Contents of the invention

The main purpose of the present invention is to provide a refrigeration cycle system for a refrigerator, aiming to solve the technical problem that the existing anti-condensation method will increase the energy consumption of the refrigerator and is not conducive to food preservation.

To achieve the above object, the present invention provides a refrigeration cycle system for a refrigerator, comprising a compressor, a condenser, a first throttling device, and a refrigerating evaporator connected end to end in order to form a refrigerant circulation circuit, with the first throttling device and The refrigerant flow path where the refrigerating evaporator is located is the first flow path, and the refrigeration cycle system of the refrigerator also includes a humidity sensor, a three-way control valve, a second throttling device and an auxiliary refrigerating evaporator connected in sequence to form the second flow path. The first flow path and the second flow path are arranged in parallel to form a first parallel node and a second parallel node sequentially distributed along the refrigerant flow direction, and the three-way control valve is set at the first parallel node, so that When the humidity detected by the humidity sensor is greater than a preset threshold, the three-way control valve selects at least the second flow path.

Preferably, the humidity sensor is used to detect the humidity of the outdoor environment of the refrigerator, or to detect the humidity of the indoor environment of the refrigerator; or, there are two humidity sensors, one of which is used to detect the humidity of the refrigerator. The outdoor ambient humidity of the refrigerator, and the other is used to detect the indoor ambient humidity of the refrigerator. When the humidity detected by any one of the two humidity sensors is greater than a preset threshold, the three-way control valve gates at least the Second stream.

Preferably, the three-way control valve is replaced by two two-way control valves, wherein one of the two-way control valves is arranged on the first flow path and is located at the inlet end of the first throttling device, and the other two-way control valve is The control valve is arranged on the second flow path and at the inlet end of the second throttling device. When the humidity detected by the humidity sensor is greater than a preset threshold, at least the two-way control valve on the second flow path is opened. .

Preferably, the humidity sensor is used to detect the humidity of the outdoor environment of the refrigerator, or to detect the humidity of the indoor environment of the refrigerator; or, there are two humidity sensors, one of which is used to detect the humidity of the refrigerator. The outdoor ambient humidity of the refrigerator, and the other is used to detect the indoor ambient humidity of the refrigerator. When the humidity detected by any one of the two humidity sensors is greater than a preset threshold, at least the two-way control on the second flow path The valve opens.

Preferably, the first throttling device is a first capillary, the second throttling device is a second capillary, and the length of the second capillary is greater than that of the first capillary.

Preferably, the refrigeration cycle system of the refrigerator further includes a dry filter and a gas-liquid separator arranged on the refrigerant circulation circuit, the dry filter is located between the condenser and the first parallel node, the A gas-liquid separator is located between the second parallel node and the compressor.

In addition, in order to achieve the above object, the present invention also provides an anti-condensation control method, which controls the refrigeration cycle system of the refrigerator described in any one of the above technical solutions, and the anti-condensation control method includes the following steps: when the When the environmental parameters detected by the refrigeration cycle system of the refrigerator meet the preset conditions, the compressor is started and at least the second flow path is selected.

Preferably, the environmental parameters include ambient humidity, and when the ambient humidity detected by the refrigeration cycle system of the refrigerator is greater than a preset threshold, the compressor is started and at least the second flow path is selected; or, the environmental parameters include a refrigerated compartment temperature and ambient humidity, when the temperature of the refrigerated compartment detected by the refrigeration cycle system of the refrigerator is greater than a preset temperature and the ambient humidity is greater than a preset threshold, the compressor is started and at least the second flow path is selected.

Preferably, after the step of starting the compressor and selecting at least the second flow path, the step further includes: closing the second flow path when the running time of the second flow path is greater than a preset time.

In addition, in order to achieve the above object, the present invention also provides a refrigerator, including a box body, the box body defines a refrigerated compartment, and the refrigerator also includes the refrigerator refrigeration cycle system described in any one of the above technical solutions. The auxiliary refrigerating evaporator is located in the refrigerating room.

Preferably, the auxiliary refrigerating evaporator is arranged on the back panel of the refrigerating room, and the auxiliary refrigerating evaporator is located above the refrigerating evaporator. A drainage tank for the defrosting water of the refrigerating evaporator; or, the auxiliary refrigerating evaporator is arranged on the top plate of the refrigerating compartment, and the refrigerator also includes a set under the auxiliary refrigerating evaporator for receiving the Describe the water receiving tray for the defrosting water of the auxiliary refrigeration evaporator.

In the refrigerator refrigeration cycle system provided by the present invention, by adding an auxiliary refrigeration evaporator used to guide the water vapor in the refrigerator room to frost, when the humidity detected by the humidity sensor is greater than the preset threshold, the refrigerant in the refrigerant cycle circuit is controlled. It flows through the second flow path to make the auxiliary refrigeration evaporator work, so that the water vapor directly frosts on the surface of the auxiliary refrigeration evaporator, thereby preventing water vapor from condensing on the inner wall of the refrigerator compartment, and the auxiliary refrigeration evaporator When working, it can also provide cooling capacity for the refrigerated compartment to maintain the low-temperature environment in the refrigerated compartment, thereby facilitating food preservation.

Description of drawings

Fig. 1 is the principle diagram of the flow path of an embodiment of the refrigerator refrigeration cycle system of the present invention;

Fig. 2 is a flow schematic diagram of another embodiment of the refrigerator refrigeration cycle system of the present invention;

3 is a schematic flow chart of an embodiment of the anti-condensation control method of the present invention;

FIG. 4 is a schematic flowchart of another embodiment of the anti-condensation control method of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described with reference to the accompanying drawings in combination with the embodiments.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention provides a refrigerator refrigerating cycle system. Referring to FIG. 1, in one embodiment, the refrigerator refrigerating cycle system includes a compressor 100, a condenser 101, a first throttling device 104 and The refrigerating evaporator 106, in addition, for the refrigerating cycle system of a refrigerator equipped with a freezing function, it also includes a refrigerating evaporator 105, which is located between the first throttling device 104 and the refrigerating evaporator 106, wherein the refrigerating evaporator 105 is used to create freezing conditions for a closed chamber, such as forming a freezing compartment with a set temperature of -26°C to -4°C, and the refrigeration evaporator 106 is used to create refrigeration conditions for another closed chamber, such as forming A refrigerated room with a fixed temperature of 0-10°C, and in practical applications, the cooling methods of the refrigerated evaporator 105 and the refrigerated evaporator 106 can be the same or different. 105 is located in the freezer compartment, while the refrigerated evaporator 106 adopts an indirect cooling type, that is, the refrigerated evaporator 106 is located outside the refrigerated compartment and exchanges heat through the wall of the refrigerated compartment.

As shown in FIG. 1 , the refrigerant flow path where the first throttling device 104 , the refrigeration evaporator 105 and the refrigeration evaporator 106 are located is the first flow path 200 . In addition, the refrigerator refrigeration cycle system also includes a humidity sensor 112, a three-way control valve 103, a second throttling device 108 connected in sequence to form a second flow path 300, and an auxiliary refrigeration evaporator 109, wherein the auxiliary refrigeration evaporator 109 is connected to the refrigerator The evaporator 106 is provided correspondingly. For example, the auxiliary refrigeration evaporator 109 is located in the refrigerated room, and the water vapor in the refrigerated room is guided by the auxiliary refrigerated evaporator 109, and the water vapor is frosted on the surface of the auxiliary refrigerated evaporator 109, thereby Prevent condensation on the inner wall of the refrigerated compartment. Wherein, the three-way control valve 103 in this embodiment may be a three-way solenoid valve or an electronically controlled proportional valve, which can be flexibly selected in practical applications.

Specifically, the first flow path 200 and the second flow path 300 are arranged in parallel to form a first parallel node and a second parallel node sequentially distributed along the refrigerant flow direction, and the three-way control valve 103 is set at the first parallel node, so The flow direction of the refrigerant at the first parallel node can be controlled through the three-way control valve 103, such as making all the refrigerant flow to the first flow path 200 or the second flow path 300, or dividing the flow of the refrigerant so that a part of the refrigerant flows to the first flow path 200 , the remaining refrigerant flows to the second flow path 300, and when the humidity detected by the humidity sensor 112 is greater than a preset threshold, for example, the preset threshold is 80% RH or any other applicable humidity value, the three-way control valve 103 selects at least the second flow path 300, that is, at least lead through the second flow path 300, so that part or all of the refrigerant in the refrigerant circulation circuit flows through the second flow path 300, so that the surface temperature of the auxiliary refrigeration evaporator 109 is low enough to guide the refrigerant in the refrigerated compartment. The water vapor frosts on the surface of the auxiliary refrigeration evaporator 109 to prevent water vapor from condensing on the inner wall of the refrigeration compartment. It can be understood that the refrigeration cycle system of the refrigerator also includes a controller 110 for controlling the operation of various functional components, such as the compressor 100, the three-way control valve 103 and the humidity sensor 112, etc. The temperature sensor 111 that detects the refrigerating temperature of the refrigerating compartment is also connected to the controller 110 . In one example, the refrigeration cycle system of the refrigerator is controlled by taking the temperature of the refrigerated compartment and the ambient humidity as the control conditions. When the temperature of the refrigerated compartment is higher than the set temperature and the ambient humidity is greater than the preset threshold, the three-way control valve 103, the first flow path 200 is closed, and the second flow path 300 is turned on. The refrigerant passes through the auxiliary refrigeration evaporator 109. 109 Dry the refrigerated compartment to prevent condensation of water vapor in the refrigerated compartment. Therefore, by using the technical solution of this embodiment, regardless of whether it is the water vapor entering the refrigerator compartment when the user opens and closes the refrigerator door, or the water vapor generated by the food, frost will form under the guidance of the auxiliary refrigeration evaporator 109. , the anti-condensation effect is obvious, and it can guarantee the refrigeration effect.

It is worth mentioning that when the auxiliary refrigeration evaporator 109 is enabled, the working time of the auxiliary refrigeration evaporator 109 is also counted, and the working time is used as the judgment condition for stopping the use of the auxiliary refrigeration evaporator 109, for example, the auxiliary refrigeration evaporator 109 is working When the time reaches 10 minutes, the compressor 100 is turned off or the first flow path 200 is selected and the second flow path 300 is closed, which further reduces the influence on the cooling effect.

In addition, the refrigerator refrigeration cycle system also includes a dry filter 102 and a gas-liquid separator 107 arranged on the refrigerant circulation circuit, wherein the dry filter 102 is located between the condenser 101 and the first parallel node, and the gas-liquid separator 107 is located at the second node. Between the two parallel nodes and the compressor 100, the refrigerant is dried and gas-liquid separated to make the refrigerant run more efficiently.

In an optional embodiment, the location of the humidity sensor 112 has multiple options. For example, the humidity sensor 112 is arranged on the outdoor side of the refrigerator to detect the ambient humidity outside the refrigerator. When the door is opened and closed, it is easy to condense in the refrigerated room due to the high ambient humidity; or, the humidity sensor 112 is arranged on the indoor side of the refrigerator, and is used to detect the indoor ambient humidity of the refrigerator. Determine whether to use the auxiliary refrigeration evaporator 109; or, there are two humidity sensors 112, one of which is used to detect the outdoor ambient humidity of the refrigerator, and the other is used to detect the indoor ambient humidity of the refrigerator. When any detected humidity is greater than the preset threshold, the three-way control valve 103 selects at least the second flow path 300. With this technical solution, not only the influence of the air humidity on the outside of the refrigerator, but also the humidity on the indoor side of the refrigerator are considered. The influence of the generated water vapor reduces the chance of condensation to a greater extent.

Referring to Fig. 2, in another embodiment, the three-way control valve 103 is replaced by two two-way control valves, corresponding to the structure shown in Fig. 2, the two two-way control valves are two-way control valve 113 and two-way control valve Control valve 114, wherein the two-way control valve 113 is arranged on the first flow path 200 and is located at the inlet end of the first throttling device 104, and the two-way control valve 114 is arranged on the second flow path 300 and is located at the second throttling device 108 The main difference from the above embodiment is that the two-way control valve 113 and the two-way control valve 114 are used to control the first flow path 200 and the second flow path 300 respectively, and when the humidity detected by the humidity sensor 112 is greater than the preset threshold value, at least The two-way control valve 114 on the second flow path 300 is opened. If the temperature of the refrigerated compartment is higher than the set temperature, the two-way control valve 113 can also be opened at the same time to make the refrigerator enter a normal cooling state. It is worth mentioning that when the two-way control valve 113 and the two-way control valve 114 are opened at the same time, in order to take into account both the cooling effect and the anti-condensation effect, the refrigerant flow rate of the first flow path 200 and the second flow path 300 can also be distributed. For example, the opening of the two-way control valve 113 is greater than that of the two-way control valve 114, or the two-way control valve 113 and the two-way control valve 114 are both proportional valves with adjustable openings, and the first flow can be distributed according to the actual situation. The flow rate of the refrigerant in the channel 200 and the second channel 300 can prevent condensation on the premise of ensuring the overall cooling effect. Among them, the two-way control valve 113 and the two-way control valve 114 are preferably electromagnetic valves with simple control method and reliable performance. Of course, they can also be any other suitable electronic control valves to realize the control of the refrigerant flow path.

For the specific installation position of the humidity sensor 112 , reference may be made to the detailed description of the above-mentioned embodiments. In this embodiment, the humidity sensor 112 is used to detect the outdoor ambient humidity of the refrigerator, or to detect the indoor ambient humidity of the refrigerator; or, there are two humidity sensors 112, one of which is used to detect the outdoor ambient humidity of the refrigerator , and the other is used to detect the indoor ambient humidity of the refrigerator. When the humidity detected by any one of the two humidity sensors 112 is greater than a preset threshold, at least the two-way control valve 114 located on the second flow path 300 will be opened, thereby using auxiliary refrigeration The frosting effect of the evaporator 109 is used to prevent condensation.

In addition, the first throttling device 104 and the second throttling device 108 in the above-mentioned embodiments can both be selected as capillary tubes, for example, the first throttling device 104 is a first capillary tube, and the second throttling device 108 is a second capillary tube, Moreover, the length of the second capillary is greater than that of the first capillary, so that the throttling of the refrigerant in the second flow path 300 is more sufficient, so that water vapor can directly frost on the surface of the auxiliary refrigeration evaporator 109 . In other embodiments, the first throttling device 104 and the second throttling device 108 may also be any other suitable throttling elements, such as electronic expansion valves.

In the technical solution of the embodiment of the present invention, by adding the auxiliary refrigeration evaporator 109 used to guide the water vapor in the refrigerator room to frost, when the humidity detected by the humidity sensor 112 is greater than the preset threshold, the refrigerant in the refrigerant circulation circuit is controlled to flow through the The second flow path 300 makes the auxiliary refrigeration evaporator 109 work, so that the water vapor is directly frosted on the surface of the auxiliary refrigeration evaporator 109, thereby preventing water vapor from condensing on the inner wall of the refrigerator compartment, and the auxiliary refrigeration evaporates. When the device 109 works, it can also provide cold energy for the refrigerated compartment, so as to maintain the low-temperature environment of the refrigerated compartment, thereby facilitating food preservation.

The present invention also provides an anti-condensation control method, which controls the refrigeration cycle system of the refrigerator to prevent condensation of water vapor in the refrigerated room. See Figure 3. The anti-condensation control method includes the following steps:

In step S100, when the environmental parameters detected by the refrigeration cycle system of the refrigerator meet the preset conditions, the compressor is started and at least the second flow path is selected. Combining with the structure shown in Figure 1, when the compressor 100 is running, the second flow path 300 is selected, specifically, the selection of the refrigerant flow direction can be realized through the three-way control valve 103, so the refrigerant flows through the auxiliary refrigeration evaporator 109 to make the auxiliary refrigeration evaporator 109 is in the working state, thereby guiding the water vapor in the refrigerated compartment to form frost on the surface of the auxiliary refrigerated evaporator 109 . In an optional embodiment, the environmental parameters include ambient humidity, and the ambient humidity may be the ambient humidity inside the refrigerated room, or the ambient humidity outside the refrigerated room, which is detected by the humidity sensor 112 arranged at the corresponding position. Two humidity sensors 112 can be set, wherein one humidity sensor 112 is arranged in the refrigerated room for detecting the air humidity in the refrigerated room; the other humidity sensor 112 is arranged outside the refrigerated room for detecting the air humidity outside the refrigerated room, When the air humidity detected by any one of the humidity sensors 112 is greater than the preset threshold, the compressor 100 is started and at least the second flow path 300 is selected. The flow path 200, combined with the refrigerating evaporator 106 and the auxiliary refrigerating evaporator 109, refrigerates the refrigerating compartment, and the auxiliary refrigerating evaporator 109 also plays an anti-condensation role.

It should be noted that the above-mentioned start-up method of the compressor 100 is only one of the special cases during the use of the refrigeration cycle system of the refrigerator. The compressor 100 also selects the first flow path 200 to cool the freezer compartment through the refrigeration evaporator 105, and cool the freezer compartment through the refrigeration evaporator 106. During this process, the second flow path 300 can be maintained. In the closed state, the second flow path 300 can also be selected.

In yet another optional implementation, the environmental parameters include the temperature of the refrigerated compartment and the ambient humidity. When the temperature of the refrigerated compartment detected by the refrigeration cycle system of the refrigerator is greater than a preset temperature and the ambient humidity is greater than a preset threshold, the compressor 100 is started and At least the second flow path 300 is gated. Compared with the above-mentioned embodiments, the influence of the ambient humidity and the temperature of the refrigerated compartment on the dew point temperature and the actual condensation is considered, the control method is more accurate, the water vapor can be guided in time, and the anti-condensation effect is more obvious.

Referring to FIG. 4 , the difference from the above embodiment is that the anti-condensation control method of this embodiment further includes after step S100:

In step S200, when the running time of the second flow path is greater than a preset time, the second flow path is closed. When the auxiliary refrigeration evaporator 109 is enabled, the working time of the auxiliary refrigeration evaporator 109 is also counted, and the working time is used as the judgment condition for stopping the use of the auxiliary refrigeration evaporator 109. For example, the auxiliary refrigeration evaporator 109 is closed when the working time reaches 10 minutes. The second flow path 300 further reduces the influence on the cooling effect under the premise of realizing anti-condensation. In addition, if the temperature of the refrigerated compartment has not reached the preset temperature after the second flow path 300 is closed, the compressor 100 is kept in operation to avoid affecting the cooling effect.

The present invention also provides a refrigerator. In one embodiment, the refrigerator includes a box body (not shown in the figure), and a refrigerating compartment is defined in the box. Function, the front side of the box body is opened, so that the freezer compartment and the refrigerated compartment have an opening respectively, wherein the refrigerated compartment can be located above the freezer compartment. In addition, the refrigerator also includes the refrigeration cycle system of the refrigerator described in any of the above technical solutions, through which heat exchange is realized to meet the requirements of food storage, and the auxiliary refrigeration evaporator 109 is located in the refrigerator room The auxiliary refrigerating evaporator 109 guides water vapor to form frost on its surface to prevent condensation in the refrigerating room. It can be understood that the refrigerator in this embodiment further includes a door body pivotally disposed on the box body to open or close the front side of the box body.

In a specific embodiment, take a refrigerated compartment whose spatial shape is roughly shaped as a cuboid as an example. The refrigerated compartment includes a bottom plate, a top plate, left and right side plates, a rear back plate, and a front side plate formed by a door body. The auxiliary refrigerated evaporator 109 may be arranged on the back panel of the refrigerating compartment, and the auxiliary refrigerating evaporator 109 is located above the refrigerating evaporator 106 . When the auxiliary refrigeration evaporator 109 works to collect water vapor through frosting, the problem of defrosting water discharge also needs to be considered. The board is provided with a drainage groove for receiving the defrosting water of the auxiliary refrigeration evaporator 109. When the auxiliary refrigeration evaporator 109 defrosts when it is not working or when the compressor 100 is shut down, the generated defrosting water is collected into the drainage groove and discharged out of the refrigerator. . In another embodiment, the auxiliary refrigerating evaporator 109 is arranged on the top plate of the refrigerating compartment, and the refrigerator also includes a receiver arranged under the auxiliary refrigerating evaporator 109 for receiving the defrosting water of the auxiliary refrigerating evaporator 109. The water tray keeps a certain distance between the water receiving tray and the auxiliary refrigeration evaporator 109, thereby preventing water vapor from condensing on the water receiving tray. Therefore, by arranging the auxiliary refrigeration evaporator 109 on the back panel or top plate of the refrigerated compartment, it is beneficial to guide the water vapor to form frost on the auxiliary refrigeration evaporator 109, which has a better anti-condensation effect.

It should be understood that this embodiment of the refrigerator includes all the technical solutions of all the embodiments of the refrigeration cycle system of the refrigerator above, and the achieved technical effects are also completely the same, so details are not repeated here.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (11)

1. a cooling cycle system of refrigerator, comprise the compressor that head and the tail connect to form refrigerant circulation circuit successively, condenser, first throttle device and refrigeration evaporator, it is characterized in that, with described first throttle device and refrigeration evaporator place refrigerant flow for first flow path, described cooling cycle system of refrigerator also comprises humidity sensor, three-way control valve, connect successively to form the second throttling arrangement of the second stream and auxiliary refrigeration evaporator, described first flow path and described second stream are arranged in parallel and are formed with the first sys node and the second sys node that distribute successively along refrigerant flow direction, described three-way control valve is arranged on described first sys node place, when the humidity that described humidity sensor detects is greater than predetermined threshold value, described three-way control valve is the second stream described in gating at least.

2. cooling cycle system of refrigerator as claimed in claim 1, is characterized in that, described humidity sensor for detecting the outside ambient humidity of described refrigerator, or for detecting the indoor ambient humidity of described refrigerator; Or, described humidity sensor is two, one of them is for detecting the outside ambient humidity of described refrigerator, another is for detecting the indoor ambient humidity of described refrigerator, when any one humidity detected in humidity sensor described in two is greater than predetermined threshold value, described three-way control valve is the second stream described in gating at least.

3. cooling cycle system of refrigerator as claimed in claim 1, it is characterized in that, described three-way control valve is substituted by two two logical control valves, two logical control valves described in one of them to be arranged in first flow path and to be positioned at the entrance point of described first throttle device, two logical control valves described in another to be arranged on described second stream and to be positioned at the entrance point of described second throttling arrangement, when the humidity that described humidity sensor detects is greater than predetermined threshold value, is at least positioned at the logical control valve of two on described second stream and opens.

4. cooling cycle system of refrigerator as claimed in claim 3, is characterized in that, described humidity sensor for detecting the outside ambient humidity of described refrigerator, or for detecting the indoor ambient humidity of described refrigerator; Or, described humidity sensor is two, one of them is for detecting the outside ambient humidity of described refrigerator, another is for detecting the indoor ambient humidity of described refrigerator, when any one humidity detected in humidity sensor described in two is greater than predetermined threshold value, is at least positioned at the logical control valve of two on described second stream and opens.

5. the cooling cycle system of refrigerator according to any one of Claims 1-4, it is characterized in that, described first throttle device is the first capillary, and described second throttling arrangement is the second capillary, and the length of described second capillary is greater than the length of described first capillary.

6. the cooling cycle system of refrigerator according to any one of Claims 1-4, it is characterized in that, described cooling cycle system of refrigerator also comprises and is arranged on device for drying and filtering in described refrigerant circulation circuit and gas-liquid separator, described device for drying and filtering is between described condenser and described first sys node, and described gas-liquid separator is between described second sys node and described compressor.

7. a condensation prevention control method, is characterized in that, controls the cooling cycle system of refrigerator according to any one of claim 1 to 6, and described condensation prevention control method comprises the following steps:

When the ambient parameter that described cooling cycle system of refrigerator detects meets pre-conditioned, start compressor and at least gating second stream.

8. condensation prevention control method as claimed in claim 7, it is characterized in that, described ambient parameter comprises ambient humidity, when the ambient humidity that described cooling cycle system of refrigerator detects is greater than predetermined threshold value, starts compressor and at least gating second stream; Or described ambient parameter comprises refrigerator room temperature and ambient humidity, when the refrigerator room temperature that described cooling cycle system of refrigerator detects is greater than preset temperature and ambient humidity is greater than predetermined threshold value, start compressor and at least gating second stream.

9. as claimed in claim 7 or 8 condensation prevention control method, is characterized in that, also comprises after the step of at described startup compressor and at least gating second stream:

When being greater than Preset Time the running time of the second stream, close the second stream.

10. a refrigerator, comprises casing, limits refrigerator room, it is characterized in that in described casing, and described refrigerator also comprises the cooling cycle system of refrigerator according to any one of claim 1 to 6, and it is indoor that described auxiliary refrigeration evaporator is positioned at described refrigerator.

11. refrigerators as claimed in claim 10, it is characterized in that, described auxiliary refrigeration evaporator arranges on the postnotum of described refrigerator room, and described auxiliary refrigeration evaporator is positioned at the top of described refrigeration evaporator, described postnotum is provided with the rhone of the defrosting water for accepting described auxiliary refrigeration evaporator; Or described auxiliary refrigeration evaporator is arranged on the top board of described refrigerator room, described refrigerator also comprises the below that is arranged on described auxiliary refrigeration evaporator for the drip tray of defrosting water accepting described auxiliary refrigeration evaporator.