JPS5981478A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field The present invention relates to a refrigeration system used for cooling the interior of a large refrigerator or the like.

(b) Background Art (1) shown in Figures 1 and 2 is a cooling unit of a refrigeration system installed inside a refrigerator, which includes a plate-fin type evaporator (2) and an air inlet of this evaporator. a support plate (4) disposed on the windward side of the side surface with an interval of 0 and supporting the electric blower (3); and a top plate (5) disposed so as to cover the upper part of the evaporator and the support plate; It consists of the evaporator and a metal drain pan (6) disposed to cover the lower part of the support plate. The evaporator has a large number of plate-shaped fins (7) that are arranged at equal intervals and have good heat conduction, and are arranged on both the left and right sides of the fin group, and the rear end edge of each fin (extends further back than the force). Both the left and right tube plates (8A) (8B), and a large number of refrigerant conduits (9) that pass orthogonally through each of the fins and both tube plates.
It is composed of. Further, the support plate is provided with a hole (1) through which the propeller (3A) of the electric blower is installed, and a support leg aυ that holds the motor (3B) of the electric blower (3) is fixed to the support plate. The left and right edges of this support plate are fixed to the rear edges of both tube plates (8A) and (8B).The drain pan is sloped downward toward the lower end of the support plate (4). A heating element (121) that generates heat during defrosting is provided on the back side, and a bottom wall (6A) with a drain port (131) formed at the lowest part.
The rear edge of the peripheral wall (6B) is fixed to the lower end of the support plate (4) with screws (14). be done.

In addition, Q51 is the drain pipe connected to drain port a (8), ao
is a header that collects the refrigerant from the refrigerant conduit (9), and aη is a low pressure gas pipe.

As shown in Fig. 3, the refrigeration system includes a refrigerant compressor α muffler (19), a flow path switching three-way solenoid valve (a), a check valve (
2I), electric blower (plate fin condenser (c) with forced ventilation by 2aK, liquid receiver C24), temperature-type expansion valve (251, evaporator (2), gas-liquid separator (a), suction pressure The regulating valve is connected to a refrigeration cycle that is connected in a ring with a high pressure gas pipe (2), a high pressure liquid pipe (A), a low pressure liquid pipe C30) and a low pressure gas pipe (17), and one end is connected to a three-way solenoid valve (the remaining 2G At the discharge end, the other end is connected to the low pressure liquid pipe (to), and the heating element a2 and check valve C31 are in contact with the drain pan (6).
) and a defrosting cycle including a hot gas bypass pipe C321 provided with The interior of the refrigerator is cooled by heat exchange and evaporation. Also, during the defrosting cycle, the operation of the electric blower (3) is stopped and the refrigerant is circulated as shown by the chain arrow to reduce the high pressure that passes through the evaporator (2). The gas refrigerant is condensed and liquefied to remove and melt the ice and frost adhering to the evaporator (2), and the heating element (1) is used to melt the ice and frost accumulated in the drain pan (6).
This is done by generating heat in step 2).

(c) Problem with the background art No. 1) The bottom wall (6A) of the drain pan (6) is tilted low toward the support plate, creating a gap (g) between the bottom surface of the evaporator (2) and -.
As a result, during the refrigeration cycle, the lower part of the cold air flow from the electric blower (3) to the lee side flows along the bottom wall (6A) as shown by the arrow (A1) in Figure 2, and fills the gap. (L) and is blown out from the cooling unit (1) with almost no heat exchange in the evaporator (2), resulting in a heat exchange loss.
Immediately after switching from the defrosting cycle to the refrigeration cycle, the drain remaining on the bottom wall (6A) goes back up the slope of the bottom wall (6A) and is scattered into the refrigerator by the cold air flow (A,).

Part 2) During the refrigeration cycle, the evaporator (
During the defrosting cycle, the ice and frost (F') adhering to the evaporator (2) are separated by 11 J as shown in the dashed line by a defrosting means using a high-pressure gas refrigerant, as shown in the dashed double dotted line.
, the ice and frost in the vicinity of the support plate (4) is slow to melt due to the influence of the high-pressure gas refrigerant (because it falls and accumulates across the support plate (4) and the bottom wall (6A)). Instead, the accumulated ice and frost prevented the melted drain on the bottom wall (6A) from reaching the drain port 03), lengthening the defrosting cycle time and making it impossible to perform drain processing smoothly.

2) Purpose of the present invention Eliminates heat exchange loss during the refrigeration cycle, and prevents condensate on the bottom wall of the drain pan from scattering into the refrigerator immediately after switching from the defrosting cycle to the refrigeration cycle, and prevents condensate accumulated on the drain pan during the defrosting cycle. To shorten the melting time of ice and frost and to smoothly process melted drain.

(e) Embodiments of the present invention FIGS. 4 to 6 show embodiments of the present invention, and in FIGS. 4 to 6, the same reference numerals as in FIGS. 1 to 3 are the same.

(The reference numeral 41 is a moisture receiving plate that is made of aluminum or the like with good heat conductivity and has a width that is approximately the same as the width of the evaporator (2). It also serves as a directing plate, and its front end is a horizontal wall (
40A), which slopes downward from the rear end of this horizontal wall,
The rear end touches (or is very close to) the lowest part of the bottom wall (6A)
An inclined wall (40B) stands up vertically from the rear end of this inclined wall, and is sandwiched between the lower end of the support plate (4) and the rear wall of the peripheral wall (6B) of the drain pan (6) with screws (14). At the same time, the vertical wall (40C) is bent and formed.
A holding part (40D) for holding an electric heater (4υ) that is energized during the defrosting cycle so as to be in contact with the lower end of the support plate (4) is bent at the upper end of the support plate (4).The electric heater is a sheathed heater. , the support plate portion (41A) surrounding the opening 00 of the support plate (4), and both the left and right tube plates (8) of the evaporator (2).
A) Tube plate part (41B) (41C) that comes into contact with (8B)
The support plate (4) is bent and held in place by stoppers (42A) (42B) provided on the upper left and right edges of the support plate (4), and comes into contact with the support plate (4).

According to this configuration, the electric blower (3) during the refrigeration cycle
The lower cold air flow (A2) of the cold air flow reaching the leeward side from The heat is exchanged in the container (6) and blown out from the cooling unit (1) into the refrigerator.Furthermore, the ice frost (F) adhering to the evaporator (2) during the refrigeration cycle is peeled off by the defrosting means during the defrosting cycle. Since the frost accumulates on the frost receiving plate (41) which also serves as a directing plate and is heated by the electric heater (41), the electric heater (4υ) can rapidly melt the ice and frost especially near the support plate (4). At the same time, by passing the condensate dripping from the evaporator (2) onto the bottom wall (6A) through the bottom of the frost receiving plate (4G), which also serves as a directing plate, it can be smoothly disposed of regardless of the accumulated ice and frost. In addition, immediately after switching from the defrosting cycle to the freezing cycle, the bottom wall (6) of the drain pan (6)
A) Even if condensate remains on the top, the cold air flow (A2) is prevented from flowing along the bottom wall (6A) K by the frost receiving plate (41), which also serves as a directing plate, preventing the condensate from flowing back. can do.

Moreover, the electric heater has a support plate (4) and both tube plates (8A).
(8B), ice and frost adhering to the support plate (4) and both tube sheets (8A) and (8B) can also be melted during the defrosting cycle.

(f) The frost receiving plate, which also serves as an effect directing plate, eliminates the flow of cold air flowing along the bottom wall of the drain pan during the refrigeration cycle, preventing heat exchange loss of the cold air flow, and also prevents the flow of cold air from flowing along the bottom wall of the drain pan from the evaporator to the bottom wall during the defrosting cycle. It can smoothly dispose of dripping condensate related to accumulated ice and frost, and prevent the remaining condensate from scattering on the drain pan immediately after switching from the defrosting cycle to the refrigeration cycle. By using the electric heater and the electric heater, it is possible to quickly melt the ice and frost near the support plate among the ice and frost that has peeled off from the evaporator and accumulated.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 to 3 show examples of the refrigeration system of the background art, Figure 1 is a perspective view of the cooling unit, and Figure 2 is Figure 1A-
A sectional view, FIG. 3 is a refrigerant circuit diagram, FIGS. 4 to 6 show an embodiment of the refrigeration system of the present invention, FIG. 4 is a perspective view of the cooling unit corresponding to FIG. 1, and FIG. 5 is a refrigerant circuit diagram. FIG. 4 is a sectional view taken along the line B-B, and FIG. 6 is a perspective view of a frost receiving plate which also serves as a directing plate, and (b) a perspective view of an electric heater. (2)...Evaporator, (3)...Electric blower,
(3A)...Propeller, (4)...Support plate,
(6) Drain pan, (6A) --Bottom wall, a
o+・i port, a21-m heating element, (4[)...frost receiving plate that also serves as a directional plate, (40D)...holding part, (41
)・・・Electric heater

Claims (1)

[Claims] 1. A plate-fin type evaporator that peels off and melts the ice and frost adhered to it by a defrosting means, and a vent located at a distance on the windward side of the air inlet side of this evaporator, in which the propeller of an electric blower is installed. a support plate for supporting the electric blower, and a drain pan having a bottom wall that is arranged directly below the evaporator and the support plate and slopes low toward the support plate and is equipped with a heating element that generates heat during defrosting. In a refrigeration system equipped with a refrigeration system, the width is approximately the same as that of the evaporator, the front end is in contact with or very close to the bottom of the evaporator, and the rear end is in contact with the lower end of the support plate and the drain pan. A refrigeration device comprising a frost receiving plate that also serves as a plate, and a holding portion for holding an electric heater that is energized during defrosting at the rear end of the frost receiving plate.