CN214223495U - Refrigerator with a door - Google Patents

Abstract

The utility model provides a refrigerator belongs to domestic appliance technical field. The refrigerator includes: the system comprises a compressor, a condenser and an evaporator assembly, wherein the compressor is respectively connected to the condenser and the evaporator assembly through reversing valves; further comprising: the first branch is connected with a dew removing pipe and/or a condensed water evaporating pipe; and a second branch connected in parallel with the first branch between the evaporator assembly and the condenser; when the refrigerator refrigerates, a concurrent refrigeration cycle is formed among the compressor, the condenser, the first branch, the evaporator assembly and the compressor; when the refrigerator is defrosted, a reverse defrosting cycle is formed among the compressor, the evaporator assembly, the second branch, the condenser and the compressor. The refrigerator can realize the reverse defrosting of the refrigerant and simultaneously reserve the functions of the dew removing pipe and the condensed water evaporation pipe.

Description

Refrigerator with a door

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a refrigerator.

Background

An evaporator of the refrigerator is fixed in the refrigerator liner, frost can be formed on the evaporator during refrigeration, a frost layer has a negative effect on heat exchange of the evaporator, and normal refrigeration of the refrigerator can be influenced when the frost layer is accumulated to a certain degree; as for defrosting of the evaporator, a heating device is usually arranged at the evaporator at present, and the purpose of defrosting is achieved by electric heating; the electric heating defrosting mode increases the electric energy consumption and does not fully and effectively utilize the heat release of the condenser, and then derives the technical scheme of the countercurrent defrosting of the refrigerator refrigerating system, namely, the refrigerant flows in the refrigerating system in a countercurrent manner, so that the evaporator has the function of the condenser, releases the heat and defrosts.

In the related art, a dew removing pipe connected with a condenser is arranged on a refrigerator, condensation on the surface of the refrigerator is prevented by using condensation heat at the dew removing pipe, however, when the refrigerator is defrosted in a counter-current manner, the dew removing pipe is changed into low temperature, so that the door body of the refrigerator is condensed, and the dew removing function of the refrigerator is influenced; or, the refrigerator is provided with a condensed water evaporation pipe connected with the condenser and evaporates the defrosting water by using the condensation heat at the condensed water evaporation pipe, however, the defrosting water is frozen when the temperature of the condensed water evaporation pipe is changed to low temperature during the reverse defrosting.

Disclosure of Invention

The utility model discloses solve one of the technical problem in the correlation technique at least to a certain extent.

Therefore, an aspect of the present disclosure is directed to a refrigerator having an advantage of a good defrosting effect, in which a defrosting evaporator is connected below a fin evaporator, and the defrosting evaporator can melt frost falling from the fin evaporator when a refrigerant of the refrigerator is defrosted in a reverse flow manner.

Another aspect of the present disclosure is directed to provide a refrigerator, in which a second branch connected in parallel to a first branch where a dew removing tube and a condensed water evaporation tube are located is disposed between a condenser and an evaporator assembly, and a refrigerant may flow through the second branch to bypass the dew removing tube and the condensed water evaporation tube during reverse defrosting, so that a problem that a door body of the refrigerator is condensed and defrosting water is frozen may be avoided.

Still another aspect of the present disclosure is directed to provide a refrigerator having a fin evaporator that prevents a problem of slush formation on bottom row fins during cooling of defrosted water by providing a bottom edge of the bottom row fins not lower than the lowest point of the bottom row cooling tubes.

A refrigerator of an aspect of the present disclosure includes: a compressor and a condenser; an evaporator assembly having one end connected to the condenser through a refrigerant pipe and the other end connected to the compressor through a refrigerant pipe; the evaporator assembly includes: a finned evaporator; and a defrosting evaporator connected below the fin evaporator; during reverse defrosting of a refrigerator, the heat of condensation at the defrost evaporator of the refrigerant flowing from the compressor to the evaporator assembly may melt the frost that falls off the fin evaporator.

According to an embodiment of the refrigerator of the present disclosure, further comprising: and the defrosting evaporator is in contact with the water receiving box so as to melt frost in the water receiving box when the refrigerator carries out reverse defrosting.

According to the embodiment of the refrigerator disclosed by the disclosure, the defrosting evaporator is not provided with the fins.

According to the embodiment of the refrigerator disclosed by the disclosure, the shape of the defrosting evaporator is matched with the inside of the water receiving box so as to fully melt frost in the water receiving box.

According to an embodiment of the refrigerator of the present disclosure, the finned evaporator has a refrigerant tube having an inlet and an outlet; the defrosting evaporator is provided with a defrosting pipe, one end of the defrosting pipe is connected to one side, close to the inlet, of the refrigerating pipe, and the other end of the defrosting pipe is connected to one side, close to the outlet, of the refrigerating pipe.

According to the embodiment of the refrigerator, the defrosting evaporator is connected with the one-way valve, the one-way valve is closed when the refrigerator performs downstream refrigeration, and the one-way valve is communicated when the refrigerator performs reverse defrosting.

According to the embodiment of the refrigerator disclosed by the disclosure, the inlet is connected with the condenser through a refrigerant pipe, the outlet is connected with the compressor through a refrigerant pipe, and the check valve is connected to one end, close to the inlet, of the defrosting pipe.

According to an embodiment of the refrigerator of the present disclosure, the defrosting pipe is connected to the inlet end of the refrigerating pipe through the check valve.

According to an embodiment of the refrigerator of the present disclosure, the inlet and the outlet are located at a lower end of the fin evaporator.

According to the embodiment of the refrigerator, the inlet and the outlet are positioned on the same side of the refrigerating pipe, and the defrosting pipe is approximately U-shaped.

A refrigerator of another aspect of the present disclosure includes: the system comprises a compressor, a condenser and an evaporator assembly, wherein the compressor is respectively connected to the condenser and the evaporator assembly through reversing valves; further comprising: the first branch is connected with a dew removing pipe and/or a condensed water evaporating pipe; and a second branch connected in parallel with the first branch between the evaporator assembly and the condenser; when the refrigerator refrigerates, a concurrent refrigeration cycle is formed among the compressor, the condenser, the first branch, the evaporator assembly and the compressor; when the refrigerator is defrosted, a reverse defrosting cycle is formed among the compressor, the evaporator assembly, the second branch, the condenser and the compressor.

According to the embodiment of the refrigerator disclosed by the disclosure, the first branch and the second branch are connected to the condenser through a three-way type solenoid valve; a first port of the solenoid valve is connected to the condenser; a second port of the solenoid valve is connected to the first branch; a third port of the electromagnetic valve is connected to the second branch circuit; when the refrigerator is not defrosted, the first port and the second port of the electromagnetic valve are communicated; when the refrigerator defrosts, the first port and the third port of the electromagnetic valve are communicated.

According to an embodiment of the refrigerator of the present disclosure, further comprising: a first capillary connected to the first branch; and a second capillary connected to the second branch.

According to an embodiment of the refrigerator of the present disclosure, further comprising: a first dry filter connected to the first branch and located between the dew removing tube and the first capillary tube; a second dry filter connected to the second branch and located between the evaporator assembly and the second capillary tube.

According to an embodiment of the refrigerator of the present disclosure, further comprising: the water receiving box is arranged below the evaporator assembly; the evaporator assembly includes: a finned evaporator; and the defrosting evaporator is connected with the fin evaporator in parallel and is in contact with the water receiving box so as to melt frost in the water receiving box during defrosting.

According to the embodiment of the refrigerator disclosed by the disclosure, a one-way valve is arranged on a branch where the defrosting evaporator is located; when the refrigerator refrigerates, the one-way valve is closed, the defrosting evaporator is not communicated, and the fin evaporator is communicated; when the refrigerator defrosts, the one-way valve is opened, and the defrosting evaporator and the fin evaporator are communicated.

In accordance with an embodiment of the refrigerator of the present disclosure, the evaporator assembly has a first interface and a second interface, the first interface being upstream of the second interface on the forward flow refrigeration cycle; the one-way valve is disposed proximate the first interface end.

A refrigerator of still another aspect of the present disclosure includes: a storage chamber; an evaporator chamber located inside the storage compartment; the evaporimeter subassembly is located the indoor of evaporimeter, the evaporimeter subassembly includes: the refrigeration pipes are distributed in a plurality of rows, and the row of refrigeration pipes positioned at the bottommost part is a bottom row of refrigeration pipes; and the fins are provided with a plurality of rows and penetrate through the refrigerating tubes, the fins at the bottommost part are bottom row fins, and the bottom edges of the bottom row fins are not lower than the bottommost ends of the bottom row refrigerating tubes.

According to the embodiment of the refrigerator disclosed by the disclosure, the fins are not arranged on the bottom row of the refrigerating tubes.

According to the embodiment of the refrigerator disclosed by the disclosure, the lower end of the bottom row of fins is provided with arc-shaped holes with downward openings, and the arc-shaped holes are matched on the bottom row of refrigerating tubes.

According to the embodiment of the refrigerator disclosed by the disclosure, the arc-shaped hole is a major arc.

According to the embodiment of the refrigerator disclosed by the disclosure, the upper parts of the bottom row of fins penetrate through the refrigeration tubes above the bottom row of refrigeration tubes, and the arc-shaped holes are in shapes of minor arcs.

Advantageous effects

According to the present disclosure, the defrosting evaporator is connected to the lower end of the fin evaporator, so that the defrosting evaporator can melt frost falling from the fin evaporator when the refrigerator is defrosted in reverse flow.

According to the refrigerator, the second branch which is connected with the first branch where the dew removing pipe/condensed water evaporation pipe is located in parallel is arranged between the evaporator assembly and the condenser, the refrigerant flows from the first branch in a downstream mode during refrigeration of the refrigerator to achieve a dew removing function of the dew removing pipe and an evaporating function of the condensed water evaporation pipe, the refrigerant flows from the second branch in a reverse mode during defrosting of the refrigerator to bypass the dew removing pipe and the condensed water evaporation pipe, and therefore the problem that condensation and defrosting water of a refrigerator door body freeze can be avoided.

According to the ice making device, the height of the bottom edge of the bottom row of fins is not lower than the lowest point of the bottom row of cooling pipes, so that the problem that ice is formed on the bottom row of fins by defrosting water cooling is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a view of an external appearance of a refrigerator according to an embodiment of the present disclosure;

fig. 2 is a schematic side sectional view of a refrigerator according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a refrigeration system of a refrigerator according to one embodiment of the present disclosure;

fig. 4 and 5 are schematic diagrams of a refrigeration system of a refrigerator according to another embodiment of the present disclosure;

fig. 6 is a view of a press bin of a refrigerator according to an embodiment of the present disclosure;

fig. 7 to 9 are views of an evaporator assembly of a refrigerator according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a bottom row of fins and a bottom row of cooling tubes of a refrigerator according to one embodiment of the present disclosure;

FIG. 11 is a schematic view of a bottom row of fins and a bottom row of cooling tubes of a refrigerator according to another embodiment of the present disclosure;

FIG. 12 is a schematic view of a bottom row of fins and a bottom row of cooling tubes of a refrigerator according to yet another embodiment of the present disclosure;

in the above figures: 1. a refrigerator; 10. a box body; 11. a box liner; 12. a housing; 20. a storage chamber; 21. an upper storage chamber; 22. a lower storage chamber; 23. a press bin; 24. a cover plate; 25. an evaporator chamber; 26. a supply hole; 27. a collection well; 28. a water receiving box; 30. a door body; 41. a compressor; 42. a condenser; 43. a first capillary tube; 44. an evaporator assembly; 45. a refrigerant pipe; 47. removing dew pipes; 48. a diverter valve; 49. a second capillary tube; 51. a first branch; 52. a second branch circuit; 53. a first dry filter; 54. a second dry filter; 55. an electromagnetic valve; 60. a drain pipe; 61. an evaporating dish; 62. a condensed water evaporating pipe; 70. a finned evaporator; 71. a refrigeration pipe; 72. a fin; 73. an inlet; 74. an outlet; 75. a bottom row of refrigeration tubes; 76. bottom row of fins; 77. an arc-shaped hole; 80. a defrosting pipe; 81. a one-way valve; 91. a first interface; 92. a second interface.

Detailed Description

The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, a side of the refrigerator facing a user when in use is defined as a front side, and an opposite side is defined as a rear side.

Referring to fig. 1 and 2, a refrigerator 1 according to one embodiment of the present disclosure includes a cabinet 10, a storage chamber 20 formed inside the cabinet 10, a cool air supply apparatus generating cool air, and a door 30 opening and closing the storage chamber 20.

The tank 10 is provided in a substantially tank shape, and includes a tank bladder 11 and an outer shell 12. A storage chamber 20 is formed inside the tank container 11, and the outer shell 12 is located outside the tank container 11. A foam insulating material configured to insulate the storage chamber 20 may be filled between the tank bladder 11 and the outer case 12.

The storage chamber 20 may be partitioned into an upper storage chamber 21 and a lower storage chamber 22 by an intermediate partition wall. The upper storage chamber 21 may serve as a refrigerating chamber, and the lower storage chamber 22 may serve as a freezing chamber. And alternatively, the upper storage chamber 21 may be used as a freezing chamber and the lower storage chamber 22 may be used as a refrigerating chamber.

However, unlike the present embodiment, the refrigerator may be provided with a vacuum chamber, a temperature changing chamber, and the like, and the aspects of the present disclosure may be applied as well.

The storage chamber 20 may be provided with an opening at a front surface thereof to store or take out food materials. The opening may be opened or closed by the door 30. The storage chamber 20 may be opened or closed by a plurality of rotary door bodies 30. In other implementations, the lower storage chamber 22 may also be opened or closed by a drawer-type door body configured to be inserted into or pulled out from the inside.

The cool air supply device is provided to form cool air by circulating a cooling circuit, and may supply the generated cool air to the storage chamber 20. The cool air supply device may include cooling circuit devices having a compressor 41, a condenser 42, a first capillary tube 43, and an evaporator assembly 44, a refrigerant pipe 45, and a fan (not shown in the drawings), the refrigerant pipe 45 guiding a refrigerant into each cooling circuit device, and the fan forcibly circulating air to supply cool air generated at the evaporator assembly 44 to the storage compartment 20. The compressor 41 may be disposed in the press compartment 23, and the press compartment 23 is formed at a lower portion of the cabinet 10.

Referring to fig. 3, the solid arrows indicate the flow direction of the refrigerant, and when the refrigerator is refrigerating, the refrigerant forms a forward flow refrigeration cycle between the compressor 41, the condenser 42, the first capillary tube 43, the evaporator assembly 44 and the compressor 41. The refrigerant is changed into a high-temperature high-pressure gas state by the compressor 41, is subjected to heat release and condensation by the condenser 42 to be a medium-temperature high-pressure liquid state, is throttled by the first capillary tube 43 to form a low-temperature low-pressure liquid state, and is subjected to heat absorption by the evaporator assembly 44 to form a low-temperature low-pressure gas state, so that the refrigerant passes through the compressor 41 to complete the refrigeration cycle of the refrigerator.

The cool air supply apparatus may include a plurality of evaporator assemblies 44 to independently cool the upper and lower storage chambers 21 and 22. In this embodiment, the upper evaporator assembly 44 may cool the upper storage chamber 21, and the lower evaporator assembly 44 may cool the lower storage chamber 22. However, unlike the present embodiment, the upper storage chamber 21 and the lower storage chamber 22 may be cooled simultaneously using a single evaporator assembly 44.

With continued reference to fig. 2, the storage compartment 20 is provided at a rear portion thereof with a cover plate 24, the cover plate 24 and a rear wall of the storage compartment 20 defining an evaporator compartment 25 therebetween, and an evaporator assembly 44 is provided within the evaporator compartment 25. The cool air generated at the evaporator assembly 44 may be supplied into the storage chamber 20 through the supply hole 26 formed at the cover plate 24 and, after circulating in the storage chamber 20, collected into the evaporator chamber 25 through the collection hole 27 formed at the cover plate 24. A fan for forcibly guiding or circulating the cool air may be provided at the supply hole 26 or the collection hole 27.

The refrigerator 1 may further include a direction valve 48, the direction valve 48 having a first port connected to a discharge port of the compressor 41, a second port connected to the evaporator assembly 44, a third port connected to the condenser 42, and a fourth port connected to a suction port of the compressor 41.

Referring to fig. 4, the dashed arrows indicate the flow direction of the refrigerant downstream of the refrigeration cycle, when the refrigerator is in refrigeration and has no defrosting requirement, the first port and the third port of the reversing valve 48 are communicated, the second port and the fourth port are communicated, and the refrigerant circulates between the compressor 41, the condenser 42, the first capillary tube 43, the evaporator assembly 44 and the compressor 41.

Referring to fig. 5, the two-dot chain line arrows indicate the flow direction of the refrigerant reverse flow defrosting cycle, when the refrigerator is defrosted, the first port and the second port of the reversing valve 48 are communicated, the third port and the fourth port are communicated, the refrigerant reverse flow passes through the evaporator assembly 44 from the compressor 41 to the condenser 42, at this time, the functions of the evaporator assembly 44 and the condenser 42 are exchanged, the evaporator assembly 44 releases heat, and the frost layer on the evaporator assembly 44 is melted, so that the defrosting purpose is realized.

The present disclosure controls the switching of refrigerant between the refrigeration cycle and the defrost cycle by the reversing valve 48.

Compared with the electric heating mode in the prior art, the method has the advantages that the refrigerant countercurrent defrosting mode is adopted, and electric energy can be saved; the evaporator chamber 25 does not need to be provided with a heating device, so that the space occupied by the evaporator chamber 25 can be saved, and the actual storage space of a user is increased; moreover, most of the refrigerants for the refrigerator are hydrocarbon refrigerants which are flammable and explosive, and the reverse defrosting has higher safety due to non-electric heating; in addition, the temperature is extremely high during electric heating defrosting, defrosting water or frost falls on the heating device to generate nourishing noise, and the refrigerant is subjected to counter-flow defrosting to avoid the noise; in addition, the temperature of the countercurrent defrosting is lower than that of the electric heating, so that the temperature fluctuation in the storage chamber 20 after defrosting is improved, and the storage and preservation quality is improved.

In some embodiments of the present disclosure, with continued reference to fig. 2 and 6, the refrigerator further includes a water receiving box 28 disposed at the bottom of the evaporator chamber 25 and below the evaporator assembly 44, and when the refrigerator performs reverse defrosting, the defrosting water flowing down from the evaporator assembly 44 enters the water receiving box 28 and flows into an evaporation pan 61 of the pressing chamber 23 along a drain pipe 60 connected to the water receiving box 28.

An evaporation pan 61 is provided at the bottom of the press cabin 23, and a drain pipe 60 extends into the evaporation pan 61.

The evaporation pan 61 is provided with a condensed water evaporation tube 62 therein, the condensed water evaporation tube 62 is connected between the condenser 42 and the first capillary tube 43, and the defrosting water in the evaporation pan 61 can be evaporated by using the condensation heat at the condensed water evaporation tube 62 during downstream refrigeration.

However, during the reverse defrosting, the refrigerant flows through the first capillary tube 43 and then flows into the condensed water evaporation tube 62 due to the change in the refrigerant flow direction, so that the temperature of the evaporation pan 61 is low and the defrosting water is frozen.

Similarly, in some embodiments of the present disclosure, referring to fig. 4, a dew-removing pipe 47 may be disposed on the refrigerator body 10 or/and the door body 30, and the dew-removing pipe 47 is generally connected between the condenser 42 and the first capillary tube 43, so that the door body can be defrosted by using the condensation heat at the dew-removing pipe 47 during downstream cooling of the refrigerator.

During the reverse defrosting, because the refrigerant flow direction changes, the refrigerant flows into the dew removing pipe 47 after flowing through the first capillary 43, which causes the temperature at the dew removing pipe 47 to be lower, so that the refrigerator door body of the refrigerator is condensed, and the dew removing function of the refrigerator is affected.

In order to avoid the problem of low temperature of the evaporating dish 61 and condensation of the box door body during reverse defrosting, referring to fig. 4 and 5, the present disclosure provides a first branch 51 and a second branch 52 connected in parallel between the evaporator assembly 44 and the condenser 42, wherein the dew removing pipe 47 and the condensed water evaporating pipe 62 are connected to the first branch 51.

When the refrigerator normally refrigerates and does not need defrosting, the downstream refrigeration cycle is communicated from the first branch 51, and when the refrigerator needs defrosting, the upstream defrosting cycle is communicated from the second branch 52, so that the dew removing pipe 47 and the condensed water evaporating pipe 62 can be bypassed by the second branch 52 when the refrigerator runs counter, and the problems of refrigerator door condensation and low temperature of the evaporating dish 61 when the refrigerator is defrosted are avoided.

In some embodiments of the present disclosure, a first capillary 43 is provided on the first branch 51 and a second capillary 49 is provided on the second branch 52. In other embodiments, the first branch 51 and the second branch 52 may be connected in parallel and then connected in series (shared) with the first capillary 43.

In some embodiments of the present disclosure, a first dry filter 53 is further disposed on the first branch 51, the first dry filter 53 is located between the dew-removing pipe 47 and the first capillary 43, and a second dry filter 54 is disposed on the second branch 52, wherein the second dry filter 54 is close to the evaporator assembly 44, and the second capillary 49 is close to the condenser 42.

In some embodiments of the present disclosure, the first branch 51, the second branch 52 and the condenser 42 are connected through a three-way solenoid valve 55, a first port of the solenoid valve 55 is connected to the condenser 42, a second port of the solenoid valve 55 is connected to the first branch 51, and a third port of the solenoid valve 55 is connected to the second branch 52.

When the first port and the second port of the solenoid valve 55 are communicated, the refrigerant flows through the first branch passage 51; when the first port and the third port of the solenoid valve 55 are communicated, the refrigerant flows through the second branch passage 52.

In other embodiments, each of the first branch 51 and the second branch 52 may be provided with an electromagnetic switch, and the electromagnetic switch controls the on and off of the corresponding branch.

Unlike the thermal radiation defrosting mode of electric heating, the countercurrent defrosting heat transfer mode of the refrigerator system is heat conduction, and the heat conduction mode has a poor defrosting effect on the frost at a longer distance, for example, the part of the water receiving box 28 has ice-water mixture melted and fallen from the evaporator assembly 44, and if the ice-water mixture is not melted completely, the ice-water mixture is frozen again along with the next refrigeration system, and the water outlet on the water receiving box 28 is blocked, so that the water overflows and freezes in the storage chamber 20.

In order to solve the problem of poor defrosting effect at a longer distance during reverse defrosting, the present disclosure improves the structure of the evaporator assembly 44:

the evaporator unit 44 has a first connection port 91 and a second connection port 92, the first connection port 91 being connected to the condenser 42 side via the refrigerant pipe 45, and the second connection port 92 being connected to the compressor 41 side via the refrigerant pipe 45.

Referring to fig. 7, the evaporator assembly 44 includes a fin evaporator 70 and a defrost evaporator connected to a lower end of the fin evaporator 70 and contacting the water receiver 28 to melt ice water in the water receiver 28.

The finned evaporator 70 comprises a refrigeration tube 71 and fins 72 penetrating the refrigeration tube 71, and is suitable for all types of finned evaporators in the prior art, wherein two ports of the refrigeration tube 71 are an inlet 73 and an outlet 74, the inlet 73 can be used as a first port 91 of the evaporator assembly 44, and the outlet 74 can be used as a second port 92 of the evaporator assembly 44.

The defrosting evaporator includes a light-tube-shaped defrosting tube 80 having no fin inserted therein, one port of the defrosting tube 80 being connected to a side of the cooling tube 71 near the inlet 73, and the other port of the defrosting tube 80 being connected to a side of the cooling tube 71 near the outlet 74.

In other embodiments, both ends of the defrosting pipe 80 can be used as the first port 91 and the second port 92 of the entire evaporator assembly 44, the inlet 73 of the cooling pipe 71 is connected to one end of the defrosting pipe 80 close to the first port 91, and the outlet 74 of the cooling pipe 71 is connected to one end of the defrosting pipe 80 close to the second port 92.

With this, the defrost evaporator and the fin evaporator 70 are connected in parallel between the first port 91 and the second port 92.

A check valve 81 is connected to the branch of the defrosting evaporator, and the check valve 81 allows the branch of the defrosting evaporator to communicate only when the refrigerant system performs reverse defrosting.

When the refrigerator is used for refrigerating, the refrigerant flows through the branch of the fin evaporator 70 and does not pass through the defrosting evaporator; when the refrigerator is defrosted, the refrigerant flows through the fin evaporator 70 and the defrosting evaporator at the same time, the fin evaporator 70 releases heat to melt the frost layer of the fin evaporator, and the defrosting evaporator releases heat to melt ice water falling into the water receiving box 28, so that the problem that the ice water falling into the water receiving box 28 cannot melt to block the water outlet is avoided.

Specifically, an end of the defrosting pipe 80 near the inlet 73 is connected to the refrigerating pipe 71 through a check valve 81.

Thus, during downstream cooling, due to the closing action of the check valve 81, the refrigerant flowing from the inlet 73 can only flow into the fin evaporator 70 along the cooling pipe 71, but cannot flow into the defrosting pipe 80, and frost does not form on the defrosting pipe 80, so that frost is prevented from being generated on the water receiving box 28 in contact with the defrosting pipe 80.

In the reverse defrosting, the refrigerant flowing from the outlet 74 can flow in through the refrigerant pipe 71 and the defrosting pipe 80 at the same time due to the conduction of the check valve 82.

In some embodiments of the present disclosure, the defrosting pipe 80 may be bent to be U-shaped, or the shape of the defrosting pipe 80 may be adapted to the inner shape of the water receiving box 28, so that the contact area between the defrosting pipe 80 and the water receiving box 28 may be fully increased, and the defrosting efficiency may be improved.

In some embodiments of the present disclosure, the inlet 73 and the outlet 74 of the refrigerant tube 71 are both located at the lower end of the fin evaporator 70, and this arrangement is because the frost formation part of the fin evaporator 70 is mainly concentrated at the lower part, and the refrigerant flow direction from bottom to top can improve the defrosting efficiency.

Referring to fig. 8, when the compartment requires cooling, the refrigerant flows in from below the front-discharge cooling pipe 71, and the check valve 81 is controlled to be closed, so that the refrigerant does not enter the defrosting pipe 80 due to the system pressure. After the refrigerant flows to the topmost pipeline of the finned evaporator 70, the refrigerant flows downwards in a downstream manner until the refrigerant flows out from an outlet 74 below the rear-row refrigeration pipe 71, so that the evaporation and temperature reduction effects are realized.

Referring to fig. 9, when the evaporator needs defrosting, the refrigerant flows in from the lower part of the rear-discharge cooling pipe 71, and the check valve 81 is controlled to be communicated, and the refrigerant is divided into two paths from the lower part: one path enters the defrosting pipe 80 part, and the lower part of the evaporator assembly 44 and the water receiving box 28 part are defrosted by utilizing the condensation heat at the moment; the other path enters the finned evaporator 70, flows to the topmost end along the rear line of pipes, then flows downstream and downward from the front line of pipes until the other path flows out from the lower inlet 73 of the front line of cooling pipes 71.

The refrigeration pipes 71 are distributed into a plurality of rows from top to bottom, and the rows are connected in an S shape, wherein the row of refrigeration pipes at the bottommost part is a bottom row of refrigeration pipes 75; the fins 72 are also arranged in a plurality of rows through the cooling tube 71, and the bottom row of fins is a bottom row of fins 76.

In order to improve the ice formation at the bottom row of fins 76 during cooling when the defrosting water flows down, the bottom edge of the bottom row of fins 76 is not lower than the lowest point of the bottom row of cooling tubes 75.

In one embodiment, referring to FIG. 10, the lower ends of the bottom row of fins 76 do not extend to the bottom row of cooling tubes 75, i.e., the bottom row of cooling tubes 75 are light pipes with no fins 72 disposed therethrough.

Or, the bottom row of fins 76 is not designed to be full fins, that is, the lower end of the bottom row of fins 76 is provided with an arc-shaped hole 77 with a downward opening, and the arc-shaped hole 77 is adapted to the upper part of the bottom row of refrigeration tubes 75.

Referring to fig. 11, the bottom row of fins 76 fits only to the bottom row of cooling tubes 75, with the arc holes 77 being the major arc.

Referring to fig. 12, the upper portion of the bottom row fin 76 is inserted into the cooling tube above the bottom row cooling tube 75, and the arc hole 77 of the bottom row fin 76 may be shaped like a minor arc and fit into the upper portion of the bottom row cooling tube 75.

The following summarizes and introduces the refrigeration process of the refrigeration system of the refrigerator:

referring to fig. 4, when the refrigerator is refrigerating, the compressor 41 compresses low-temperature and low-pressure refrigerant vapor from the evaporator assembly 44 into high-temperature and high-pressure superheated vapor, at this time, the system pipeline is communicated with the condenser 42 through the reversing valve 48, the condenser 42 cools the high-temperature and high-pressure vapor discharged from the compressor 41, the first port and the second port of the electromagnetic valve 55 are communicated, the refrigerant enters the condensed water evaporation tube 62 to continue cooling and evaporate defrosting water in the evaporation pan 61 by using condensation heat, then enters the dewing tube 47 to continue cooling and dewing the refrigerator door body by using condensation heat, then enters the first capillary tube 43 after filtering system impurities and moisture by the first drying filter 53, and enters the fin evaporator after the throttling and depressurizing action of the first capillary tube 43, the low-temperature and low-pressure refrigerant liquid in the fin evaporator absorbs the compartment heat and then returns to the compressor 41 through the reversing valve 48. In this flow path, the fin evaporator cools and frosts, and the check valve 81 before the defrosting evaporator is closed, so that the refrigerant cannot flow into the defrosting evaporator, and the defrosting evaporator does not operate.

The following summarizes the defrosting process of the refrigeration system of the refrigerator:

with continued reference to fig. 5, during defrosting of the refrigerator, the compressor 41 compresses low-temperature and low-pressure refrigerant vapor from the evaporator assembly 44 into high-temperature and high-pressure superheated vapor, at this time, the system pipeline is directly communicated with the fin evaporator and the defrosting evaporator through the reversing valve 48, the fin evaporator uses the high-temperature and high-pressure vapor discharged from the compressor 41 to melt the frost condensed on the body, the defrosting evaporator melts the frost falling below the fin evaporator to avoid blocking the drain hole of the defrosting water, the flow path is communicated with a lower one-way valve 81, impurities and moisture in the system are filtered by a second drying filter 54 and then enter a second capillary tube 49, and after the throttling and pressure reduction effects of the second capillary tube 49, the first port and the third port of the control solenoid valve 55 are communicated to the condenser 42 (at the moment, the condenser 42 is refrigerated and frosted), and finally, the control solenoid valve 48 returns to the compressor 41. In this flow path, the second port of the solenoid valve 55 is closed and is pressurized, and at this time, no refrigerant flows into the first dry filter 53, the first capillary tube 43, the dew condensation removing tube 47, and the condensed water evaporation tube 62, and therefore, the operation is not performed, and therefore, problems such as condensation of the box door and low temperature of the evaporation pan do not occur.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A refrigerator, characterized by comprising: the system comprises a compressor, a condenser and an evaporator assembly, wherein the compressor is respectively connected to the condenser and the evaporator assembly through reversing valves;

further comprising:

the first branch is connected with a dew removing pipe and/or a condensed water evaporating pipe; and

a second branch connected in parallel with the first branch between the evaporator assembly and the condenser;

when the refrigerator refrigerates, a concurrent refrigeration cycle is formed among the compressor, the condenser, the first branch, the evaporator assembly and the compressor; when the refrigerator is defrosted, a reverse defrosting cycle is formed among the compressor, the evaporator assembly, the second branch, the condenser and the compressor.

2. The refrigerator according to claim 1, wherein the first branch and the second branch are connected to the condenser through a three-way type solenoid valve;

a first port of the solenoid valve is connected to the condenser;

a second port of the solenoid valve is connected to the first branch;

a third port of the electromagnetic valve is connected to the second branch circuit;

when the refrigerator refrigerates, the first port and the second port of the electromagnetic valve are communicated; when the refrigerator defrosts, the first port and the third port of the electromagnetic valve are communicated.

3. The refrigerator according to claim 1, further comprising:

a first capillary connected to the first branch;

and a second capillary connected to the second branch.

4. The refrigerator of claim 3, further comprising:

a first dry filter connected to the first branch and located between the dew removing tube and the first capillary tube;

a second dry filter connected to the second branch and located between the evaporator assembly and the second capillary tube.

5. The refrigerator according to any one of claims 1 to 4, further comprising: the water receiving box is arranged below the evaporator assembly;

the evaporator assembly includes:

a finned evaporator; and

and the defrosting evaporator is connected with the fin evaporator in parallel and is in contact with the water receiving box so as to melt frost in the water receiving box during defrosting.

6. The refrigerator as claimed in claim 5, wherein a check valve is provided on a branch where the defrosting evaporator is located; when the refrigerator refrigerates, the one-way valve is closed, the defrosting evaporator is not communicated, and the fin evaporator is communicated; when the refrigerator defrosts, the one-way valve is opened, and the defrosting evaporator and the fin evaporator are communicated.

7. The refrigerator of claim 6 wherein the evaporator assembly has a first interface and a second interface, the first interface being upstream of the second interface during a refrigeration cycle; the one-way valve is disposed proximate the first interface end.

8. The refrigerator according to claim 5, wherein the inlet and outlet of the fin evaporator are located at a lower end of the fin evaporator.

9. The refrigerator of claim 5 wherein the defrost evaporator is shaped to conform to the interior of the drip tray.

10. The refrigerator of claim 5, wherein the defrost evaporator is free of fins.

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