JPH0335591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an evaporator mainly used in refrigerators.

Prior Art A conventional evaporator of this type has a structure as shown in FIG.

That is, 1 is a flat refrigerant flow path, which is arranged parallel to the airflow direction. A large number of fin members 2 are attached to the outer wall of the flat refrigerant flow path 1 so as to be substantially parallel to the airflow direction. Further, 3 and 4 are a refrigerant inlet pipe and an outlet pipe connected to the flat refrigerant flow path 1. Note that arrow 5 indicates the airflow direction. The refrigerant flowing in from the inlet pipe 3 flows within the flat refrigerant flow path 1 . At this time, the air receives heat from the airflow side through the fin member 2, evaporates, and flows out from the outlet pipe 4.
FIG. 4 is an exploded perspective view of a flat member constituting the flat refrigerant flow path 1. FIG. A header member 9 is provided in a flow path member 7 in which a plurality of slits 6 serving as refrigerant flow paths are provided, and in which a header 8 is provided to allow the plurality of slits 6 to communicate with each other and to attach refrigerant inlet/outlet pipes 4 and 3. A flat plate-shaped refrigerant flow path is constructed by laminating and integrating outer wall members 10, which serve as outer walls of the refrigerant flow path, on both upper and lower surfaces of the refrigerant flow path.

Problems to be Solved by the Invention However, in an evaporator with such a structure, it is necessary to reduce the pressure of the refrigerant flowing in from the inlet pipe 3 to the evaporation pressure. It is difficult to evenly divide the refrigerant into the plurality of slits 6 that serve as flow paths, and variations occur in the amount of refrigerant flowing through the plurality of refrigerant flow paths.
This creates a refrigerant flow path that does not function effectively, resulting in a problem that the heat transfer performance of the evaporator deteriorates.

Therefore, the present invention provides an evaporator for a refrigerator that can evenly divide refrigerant into a plurality of refrigerant channels.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a flat plate shape in which each of a plurality of slits serving as a refrigerant flow path is provided with a constricted part with a narrow slit width near the header part. A flat refrigerant flow path is constructed by laminating and integrating the flow path member and outer wall members serving as outer walls of the refrigerant flow path on both upper and lower surfaces of the flow path member, and providing a header for communicating the plurality of slits with each other. , and is constructed by attaching a large number of fin members that are flat in the air flow direction to the outer wall of the flat refrigerant flow path.

Effects The present invention has the above-mentioned configuration, which allows the liquid refrigerant to be evenly divided into a plurality of refrigerant flow paths at the header portion, and
Since the pressure can be reduced to the evaporation pressure in the throttle section, it is possible to prevent variations in the amount of refrigerant flowing through the plurality of refrigerant channels.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

FIG. 1 is a block diagram of an evaporator for a refrigerator according to the present invention, and 11 is a flat refrigerant flow path, which is arranged parallel to the air flow direction. A number of fin members 12 are attached to the outer wall of the flat refrigerant flow path 11 so as to be substantially parallel to the airflow direction, and the pitch of the fin members 12 is increased toward the windward side in consideration of frost formation. It is set to be. Also,
13 and 14 are an inlet pipe and an outlet pipe connected to the flat refrigerant flow path 11. Note that arrow 15 indicates the airflow direction, and arrow 16 indicates the flow direction of the refrigerant.

FIG. 2 is an exploded perspective view of a flat plate member constituting the flat refrigerant flow path 11. For each of the plurality of slits 17 forming the refrigerant flow path, the slit width is narrowed near the header portion on the inlet side. A flat channel member 19 provided with a portion 18 and the plurality of slits 1
A header member 21 provided with a header 20 for communicating the refrigerant flow path members 19 with each other is laminated on both upper and lower surfaces of the flow path member 19, and an outer wall member 22 that becomes an outer wall of the refrigerant flow path is further laminated and integrated on both upper and lower surfaces. A flat refrigerant flow path 11 is configured by this. In addition,
Reference numerals 23 and 24 are connection holes for connecting the inlet pipe 13 and the outlet pipe 14.

In the refrigerator evaporator configured as described above, the liquid refrigerant that flows in from the inlet pipe 13 is divided equally into the refrigerant flow path formed by the plurality of slits 17 at the inlet side header 20, and is evaporated at the constriction section 18. The refrigerant is depressurized to a certain pressure, exchanges heat with the airflow flowing smoothly along the flat refrigerant channel 11 and between the fin members 12, evaporates, becomes gaseous, and joins again at the outlet side header 20. rear,
It flows out from the outlet pipe 14.

In this way, a plurality of slits 1 which become refrigerant flow paths are formed.
Since the constricted part 18 with a narrow slit width is provided at the inlet of the refrigerant 7, liquid refrigerant can be introduced into the inlet pipe 13 of the flat refrigerant flow path 11, so that the refrigerant can be evenly divided by the header 20. This makes it possible to prevent variations in the amount of refrigerant flowing through a plurality of refrigerant channels, and to improve the heat transfer performance of the refrigerator evaporator.

Effects of the Invention The present invention provides a flat flow path member in which a constriction portion with a narrow slit width is provided near the header portion for each of a plurality of slits serving as refrigerant flow paths, and A flat refrigerant flow path is constructed by laminating and integrating outer wall members that will become the outer wall of the refrigerant flow path, and providing a header that communicates the plurality of slits with each other, and forming a flat refrigerant flow path on the outer wall of the flat refrigerant flow path in the air flow direction. Since it is constructed by attaching a large number of parallel fin members, liquid refrigerant can be guided to the inlet of the flat refrigerant flow path, so the refrigerant can be divided evenly by the header, and multiple refrigerant flows can be divided. It is possible to prevent variations in the amount of refrigerant flowing through the passages, to make all the refrigerant passages work effectively, and to improve the heat transfer performance of the refrigerator evaporator.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an evaporator for a refrigerator according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a flat refrigerant flow path of the evaporator, and FIG. 3 is a perspective view of a conventional evaporator for a refrigerator. , FIG. 4 is an exploded perspective view of the flat refrigerant flow path of the evaporator. DESCRIPTION OF SYMBOLS 11... Flat refrigerant channel, 12... Fin member, 18... Throttle part, 19... Channel member, 20...
...header, 21...header, 22...header member.

Claims (1)

[Claims] 1. For each of the plurality of slits that serve as refrigerant flow paths, a flat flow path member is provided with a constricted portion with a narrowed slit width near the header portion on the inlet side, and a refrigerant flow path is provided on both upper and lower surfaces of the flow path member. A flat refrigerant flow path is constructed by laminating and integrating outer wall members that will become the outer wall of the passage, and by providing a header that communicates the plurality of slits with each other, and a header that is parallel to the airflow direction on the outer wall of the flat refrigerant flow path. An evaporator for a refrigerator is provided with a large number of fin members, and the fin pitches of the fin members become larger toward the windward side of the airflow, wherein each of the constricted portions has the following features:
An evaporator for a refrigerator configured so that the refrigerant can be evenly divided by the header.