JPS60265A - Cooling device - 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) Industrial application field The present invention connects a compressor, a condenser, a cooler, etc. with pipes in an annular manner, and (7) circulates a gas refrigerant to the cooler for defrosting. Regarding cooling equipment.

(b) Conventional technology The following will explain based on FIGS. 1 to 3.

Figure 1 is a schematic refrigerant circuit diagram of the cooling system, including a compressor (1),
Muffler (2), four-way valve (3), check valve (4), condenser (5), receiver tank (6), deno-iderator (
7), expansion valve (8), cooler (9), acheiver (
b), and the suction pressure regulating valve (11) are connected in an annular manner, and a check valve Sakaki is connected between the four-way valve (3) and the piping (2) on the expansion valve (8) side of the cooler (9). The hot gas defrosting piping (b) is connected to the piping. Also, four-way valve (3
) and the suction pressure regulating valve 0(1), a pressure extraction pipe (11:it) for operating the four-way valve is connected, and a condenser (
5) and the cooler (9), there is an axial flow blower α0 on the condenser side that sends cold air to each of them, and an axial flow blower for the cooler (
17) is provided, and a dew receiving tray (G) is provided at the lower part of the cooler (9) to receive dew during defrosting.

Fig. 2 is a schematic perspective view of the cooler (9), and Fig. 3 is a schematic perspective view of the cooler (9).
9) is attached to the side wall (not shown) of a freezer, for example, in a sectional view taken along line A-A in Figure 2, side plates Q and (1'J) are provided on both left and right sides, and the top surface is It is covered with a plate, and the lower surface is covered with a dew pan (G) to which a heater (18H) for preventing freezing is attached and receives dew during defrosting.A predetermined gap is left between the side plate a and the samurai. A plurality of fins (2) are provided on the side panel (ILα scratches and fins).
First to sixth heat exchange pipes are attached from the upper part to the lower part of the cooler (9) passing through η.

These first to sixth heat exchange pipes (A) to (A) meander in the vertical direction as shown by solid lines in FIG. It is piped to four sides, and the end on the cold air outlet side, that is, the end on the refrigerant inflow side (22A
) to (27A) are flow dividers (
1), and the cold air suction side end, that is, the refrigerant outflow side ends (22B) to (27B) are connected to the achievator 04 via a header (b). still,
Piping installed between the flow divider (2) and the expansion valve (8) (
6) is connected to a hot gas defrosting pipe α.

In addition, a drain pipe is connected to the lower surface of the dew pan (G), and blades (1
The suction port side panel (2), in which an opening (to) adjacent to which is formed (7F), is removably attached using fixtures (2), (to).

In the cooler (9) of the cooling device, the first to sixth heat exchange pipes (a) to the wire are piped from the cold air outlet (c) side, and the refrigerant flows into the cooler (9) for cooling. Vessel (9)
This is done from the four sides of the cold air outlet to improve heat exchange performance.

Defrosting of the cooler (9) will be explained below. For example, at the time set in the defrost timer (not shown), a defrost signal is given to the four-way valve (3), the six-way circulation to the condenser (5) is stopped, and the hot gas defrost piping is The hot gas refrigerant flows from the compressor (1) to the cooler (9) via α→, and defrosting operation is started on the cold air outlet side of the first to sixth heat exchange pipes (a) to (a). Ends (22A), (23A),
The hot gas refrigerant flows from (24A), (25A), (26A), (27A) to the cold air inlet side end (22B inlet (23B), (24B inlet (25B), (26B), (27B), header I3]) into the cooler (9).
Defrosting is performed by heat exchange with the hot gas refrigerant,
For example, when the temperature of the header 〇 reaches 10℃, the temperature sensing element (31A) installed in the header 0η senses the temperature and automatically stops the defrosting signal to the four-way valve (3). Then, defrosting operation will stop. At this time, the refrigerant inflow side ends (22A) to (27A) of the first to sixth heat exchange pipes Tae to Kan
A) serves as an inlet for hot gas refrigerant during defrosting operation, so the temperature becomes high (40° C. to 606° C.), and the melted water on the fin al) is heated and becomes steam. This steam is the third
As shown by the arrow (9A) in the figure, the air rises from the cold air outlet of the cooler (9), touches the ceiling wall (c) of a freezer where the cooler (9) is installed, for example, and freezes. Ice or frost forms. This icing or frost grows each time the cooler (9) is defrosted, becomes a lump of ice or frost that falls due to vibrations, etc., and falls on the products in the freezer, damaging the products. There were negative effects.

In addition, since the first to sixth heat exchange pipes (A) to (A) are piped from the cold air outlet (E) side of the cooler (9) to the fourth side of the cold air suction port, cold air is removed during defrosting operation. There was a drawback that defrosting in the vicinity of the suction port was not completely performed.

(C) Purpose of the Invention The present invention provides that dew that is melted during defrosting operation of a cooler installed in a cooling device rises as steam, and freezes on the ceiling wall surface of, for example, a freezer where the cooler is installed. The purpose of this invention is to prevent frost or ice from growing into lumps, and to reliably remove cold from the cooler.

B) Structure of the Invention The present invention provides a cooling device in which an accumulator, a compressor, a condenser, an expansion valve, a cooler, etc. are connected in a ring, and a hot gas refrigerant is passed through the cooler to defrost the cooling. The cooler is piped between the expansion valve and the accumulator and is divided into a plurality of parts in the vertical direction, and the refrigerant flows from the cold air inlet side of the cooler to the cold air outlet side, and from the cold air outlet side to the cold air inlet. The number of intersections between the piping from the cold air outlet side to the cold air intake side and the cooler fins is calculated from the number of intersections between the piping from the cold air intake side to the cold air outlet side and the fins. When the hot gas refrigerant is passed through the heat exchange pipe and the cooler is defrosted, the heat exchange with the hot gas refrigerant in the cooler is approximately equalized, and the defrosting is performed. In addition to ensuring that the heat exchange is carried out reliably during defrosting operation, water vapor is generated due to the heat of the rehot gas refrigerant that is shifted toward the cold air outlet side of the cooler, and this water vapor is prevented from freezing and growing into frost or ice lumps. It is something to do.

(e) Examples Examples of the present invention will be described below with reference to FIGS. 4 to 6. In addition, FIG. 4 is a schematic perspective view of the cooler according to the present invention, and FIG. 5 is a sectional view taken along the line B-B' in FIG. Detailed explanation will be omitted.

Both side plates α Samurai, α rib and fin e1 of the proposed cooler (9)
seventh to twelfth heat exchange pipes (b) to twelfth heat exchange pipes (b) to twelfth pipes are piped from the top to the bottom between the expansion valve (8) and the accumulator (g), penetrating through the cooler (9') and spanning the entire width of the cooler (9'). are piped, and one of the refrigerant inflow side ends (37A) to (42A) of each heat exchange pipe (6) is connected to a flow divider).
The respective branch pipes are connected to each other by piping.

The seventh to twelfth heat exchange pipes (b) to (b) have one refrigerant inflow side end (3) as shown by the solid line in FIG.
7A) to (42A) to the cold air outlet (
(c) side, is piped vertically on the four sides of the cold air outlet, and is further piped toward the fourth side of the cold air suction port to the other refrigerant outlet end (37B) to (42B). Furthermore, the number of intersections between the heat exchange pipes (b) to (6) and the fins (b), where the refrigerant flows from the cold air outlet (goods) side to the four sides of the cold air suction port, reaches the maximum, and the cold air flows from the four sides of the cold air suction port. The number of times the refrigerant crosses the heat exchange pipes (b) to (6) and the fins 01) through which the refrigerant flows toward the air outlet (c) side is minimized, and the heat exchange from the cold air air outlet four side to the cold air suction port four side is minimized. The number of intersections between the pipes) to (6) and the fins Q) is determined by the number of times the heat exchange pipe (
b) to (6) and the fin center, and the refrigerant inflow side ends (37A) to (42A) are connected to the refrigerant outflow side ends (37B) to (42B).
) is formed on the fourth side of the cold air outlet.

As mentioned above, the seventh to twelfth heat exchange pipes (2) to (
During defrosting operation of the cooler (a) to which 6) is piped, hot gas refrigerant flows from the compressor (1) to the hot gas defrosting pipe α.
The seventh to twelfth heat exchange pipes (b) to (
6), and the hot gas refrigerant is sent to one refrigerant inlet end (37A), (38A), (39A), (40A), (
41A), (42A) to the cold air outlet @ side, and further the other refrigerant outlet side end (37B), (38B), (3
9B), ('40B), (41B), and (42B), and is sent to the compressor (1) via the header 〇]) and the accumulator (g).

Therefore, during cooling operation, the heat exchange in the cooler (9') is performed approximately evenly, and cooling operation is performed effectively, and during defrosting operation, the amount of heat of the high-temperature hot gas refrigerant is transferred to the cooler (9'). It is possible to prevent a large amount of heat from being consumed at the cold air outlet, for example, and the heat is formed in the cooler (a) while passing through the seventh to twelfth heat exchange pipes (b) to the wharf. The heat is exchanged almost evenly with the frost or ice, and the amount of heat can be used extremely effectively for defrosting operation of the cooler (9'), and the defrosting time can also be shortened. In addition, during the defrosting operation time, the temperature of the cooler (the four sides of the cold air outlet or the four sides of the cold air inlet) can be prevented from becoming high, and the temperature can be kept at 25°C to 30°C.
The amount of steam generated from the cooler (9') can be significantly reduced, and the freezer ceiling wall (toward) above the cooler (a) can be significantly reduced.
It is possible to reliably prevent the product from freezing again when it comes into contact with steam, growing into frost or ice blocks each time the defrosting operation is performed, and falling due to vibrations or the like and damaging the products inside the warehouse. Furthermore, the seventh
The refrigerant inflow side ends (37A) to (42A) of the twelfth heat exchange pipes (b) to (6) are connected to the refrigerant outflow side ends (
37B) to (42B) are formed on the cold air outlet side, and the refrigerant outlet side ends (37B) to (42B) are located closer to the cooler (
A) Since the fin Q0 is formed on the fourth side of the cold air suction port of the cooler (9') during cooling operation,
It is possible to prevent the surface temperature from extremely decreasing and a large amount of frost from forming on the surface of 74709, and to prevent the heat exchange efficiency of the cooler (a) from decreasing. Since the refrigerant flows from (37A) to (42A) to the cold air outlet side, it is possible to reliably defrost the cold air inlet side near the refrigerant inlet end portions (37A) to (42A).

In addition, in the seventh to twelfth heat exchange pipes (b) to rings, the piping from the four sides of the cold air inlet to the four sides of the cold air outlet is arranged so that the number of times it crosses the Q fins is minimized, and the cold air blower is By meandering the piping from the outlet side to the cold air suction port four sides in the vertical direction so that the number of times it crosses the fin Q9 reaches the maximum pressure, one refrigerant inflow side end (37A
) to (42A) to the four sides of the cold air outlet is shortened, and the hot gas refrigerant flow from the four side of the cold air outlet to the other refrigerant outlet end (37B) to (42B). This makes it possible to lengthen the path and prevent a decrease in the amount of heat of the hot gas refrigerant that is heat exchanged on the four sides of the cold air outlet of the cooler (a). The heat exchange can be made more uniform.

In addition, an inclined top plate (toward) that slopes downward from the upper end in the cold air blowing direction over the entire width of the upper part of the cold air outlet of the cooler (A).
Attach a wind direction plate (c) formed by bending an aluminum plate to the and left and right side panel members, and attach an icing prevention heater (/4!) to the bottom surface of the inclined top plate ■, an aluminum sheet with adhesive on one side. θ
When pasting using a
As shown in Figure 2, during defrosting operation, the steam leaking outward from the cold air outlet of the cooler (I) is guided to the slanted top plate Sakaki and cooled by the cooler (A).
Since the ice is returned to the upper part of the freezer, it is possible to more reliably prevent the formation of frost or ice lumps on the ceiling and wall surfaces of the freezer.

(f) Effects of the Invention The heat exchange pipe of the cooler is piped between the expansion valve and the accumulator, runs through both side plates and fins over the entire width of the cooler, and is divided into a plurality of parts in the vertical direction,
The heat exchange pipe and the fins are piped so that the refrigerant flows from the cold air inlet side of the cooler to the cold air outlet side and further flows to the cold air inlet side, and the refrigerant further flows from the cold air outlet side to the cold air inlet side. The piping is arranged so that the number of times that the refrigerant crosses is greater than the number of times that the heat exchange pipe and the fins cross, where the refrigerant flows from the cold air intake side to the cold air outlet side, so that the heat exchange in the cooler during cooling operation is When defrosting the cooler by flowing the hot gas refrigerant through the heat exchange pipe, the heat of the hot gas refrigerant is almost evenly distributed in the cooler, and the frost formed on the cooler is effectively removed. Or, ice can be reliably melted, and the temperature on the cold air outlet side or the cold air intake side of the cooler can be prevented from becoming too high, and the amount of steam generated from the cooler can be significantly reduced. It is possible to reliably prevent frost or ice lumps from forming above the cooler, for example on the ceiling wall surface of a freezer, and to reliably prevent frost or ice lumps from falling and damaging products. In addition, if the refrigerant inlet end of the heat exchange pipe is formed closer to the cold air outlet than the refrigerant outflow end, a large amount of frost will form on the cold air inlet side of the cooler, which will hinder the heat exchange of the cooler. The efficiency can be prevented from decreasing, and the hot gas refrigerant flows from the refrigerant inflow side end where the cold air suction side pressure of the cooler is formed.

It is possible to reliably defrost the refrigerant inlet end and the cold air suction port in the vicinity thereof.

[Brief explanation of drawings]

FIG. 1 is a schematic refrigerant circuit diagram of the cooling device, FIGS. 2 and 3 show a conventional example, FIG. 2 is a schematic perspective view of the cooler, and FIG. 3 is a sectional view taken along the line A-A in FIG. 4 to 6 show one embodiment of the present invention, FIG. 4 is a schematic perspective view of the cooler, FIG. 5 is a sectional view taken along the line B-B' in FIG. 4, and FIG. 6 is a wind direction. It is a perspective view of a board. (1)...Compressor, (5)...Condenser, (8)
...Expansion valve, (9)...Cooler, m...Accumulator, o4...Hot gas defrosting piping, α燵Q groan...Side plate, Q, 9...Fin, (c)・
・・Cold air outlet, 翰・Cold air inlet, (b) ~)
... 7th to 12th heat exchange pipes, (37A) ~
(42A) ... Refrigerant inflow side end, (37B) - (4
2B)... Refrigerant outflow side end, (c)... Wind direction plate. Figure 1 along with Figure 3

Claims (1)

[Claims] 1. An accumulator, a compressor, a condenser, an expansion valve, and a cooler are connected in an annular manner through piping, and the condenser side piping is connected to the compressor and the expansion valve is connected to the cooler. A hot gas defrosting piping is connected between the side piping and a hot gas refrigerant is sent from the compressor to the cooler via the hot gas defrosting piping to defrost the cooler. In the device, the cooler is piped between side plates provided on both sides, a plurality of fins provided with a predetermined gap between the side plates, and the expansion valve and the accumulator. In addition, a heat exchange pipe is provided that extends through the both side plates and fins over the entire width of the cooler and is divided into a plurality of vertically divided heat exchange pipes, and during cooling operation and defrosting operation, each of the heat exchange pipes The piping is arranged so that the refrigerant flows from the cold air inlet side to the cold air outlet side of the cooler, and further from the cold air outlet side to the cold air inlet side, and the refrigerant flows from the cold air outlet side to the cold air inlet side. The piping is characterized in that the number of times the flowing heat exchange pipe crosses the fins is greater than the number of times the heat exchange pipe crosses the fins, the refrigerant flowing from the cold air inlet side to the cold air outlet side. Cooling system. 2. In each of the heat exchange pipes, the refrigerant inflow side end to the cooler of the heat exchange pipe is formed closer to the cool air outlet than the refrigerant outflow side end. Cooling device as described in section. 3. The cooling device according to claim 1, wherein a wind direction plate is provided at the upper part of the cooler on the side of the cold air outlet, the wind direction plate being inclined downward from the upper end toward the cold air outlet over the entire width.