JPS59164855A - 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 Field of the Invention The present invention relates to small-sized refrigeration devices such as artificial garden refrigerators, and particularly relates to improvements in devices using capillary tubes as pressure reducing devices.

Conventional configuration and its problems In this type of refrigeration system, the optimal amount of pressure reduction varies depending on the operating conditions, as shown in Figure 1.
In a refrigeration system using a capillary tube with an appropriate amount of decompression a at 5°C (line A), the appropriate amount of decompression is small at an outside temperature of 30°C (line B), resulting in a decrease in efficiency. .

In addition, if the capillary chain is selected to achieve an appropriate amount of depressurization at an outside temperature of 30°C (line B), the outside temperature will be 15°C (line B).
In line A), the amount of pressure reduction becomes excessive than the appropriate pressure reduction amount a, and this also results in a decrease in efficiency.

As an improvement on this, there is a refrigeration system shown in FIG. This is compressor 1, condenser 2, capillary tube 3,
An evaporator 4 and a suction pipe 5 are connected in a ring. The upstream portion of the capillary tip 3 is thermally connected to the heater 6, and the downstream portion is thermally connected to the suction pipe 5. The heater 6 is controlled at a predetermined outside temperature by a thermostat or the like (in the conventional example, the outside temperature is 20°C).
), it is energized when the temperature is higher than that, and it is not energized when the temperature is lower than that.

This operation is performed by energizing the heater 6 when the outside temperature is 2Q''C or higher, and generating flash gas in the refrigerant flowing inside the cavity refrigerant 3, thereby increasing the flow path resistance and increasing the amount of depressurization. C or less, the heater 6 is de-energized to maintain the original pressure reduction amount in the capillary chieve 3.

In other words, the relationship between the outside temperature and the appropriate amount of pressure reduction is characteristic C shown in FIG. This refrigeration system has a step-like characteristic because the amount of pressure reduction is set to be an appropriate amount of pressure reduction for an outside temperature of 30° C. when electricity is applied. Therefore, although the amount of pressure reduction approaches the appropriate characteristic C, it has the disadvantage that input from the heater 6 is required and the effect is halved.

In view of the drawbacks that exceed the objectives of the invention, the present invention aims to provide a refrigeration system that self-controls the amount of pressure reduction by following changes in outside air temperature without requiring any electrical control.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is constructed by exchanging heat between a part of the capillary tube and the piping of the condenser where the refrigerant in the condenser starts to condense. This changes the resistance of the capillary peak.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 4, 101 is a refrigeration system, including a compressor 1o2, a first condenser 103, and a connecting pipe 1o4.
, second capacitor 1o5, capillary tube 1o6
, an evaporator 107, a pipe 108, and a compressor 10 are connected in a ring.

The capillary chive 106 is approximately 10 mm from the inlet portion 106a.
0mm position 1Q6b to 300rrvn (D position 10
6c and the connecting pipe 104, and the downstream capillary tubes 106 and 106d are heat exchanged with the satan tube pipe 108.

1st. The relationship between the heat dissipation capabilities of the second capacitors 103 and 105 is that when the outside temperature is 15°C, the first capacitor 103
The heat dissipation capacity is determined so that the refrigerant at the outlet section 103a starts condensing.

As is well known, as the outside temperature increases, the cooling load increases, and the amount of heat dissipated by the condenser becomes insufficient. , when O'C, the first capacitor 10
No. 3 cannot radiate heat to a state where the refrigerant at the outlet portion 103a starts to condense. That is, in this case, the refrigerant at the outlet portion 103a is superheated gas, and has a temperature higher than the condensation temperature m.

In addition, in the capillary cheap 106, the inlet portion 10
The refrigerant 6a is a liquid refrigerant that is slightly supercooled from the condensation temperature, and as it is depressurized from the inlet 106a, it becomes a saturated liquid and begins to generate bubbles from around 300 brains 106c.

. To explain the above temperature relationship on the Mollier diagram in Fig. 6, at an outside temperature of 15°C, the high temperature and high pressure gas discharged from the compressor 102 moves from point (A) in the superheated gas region to point 1.
(
b) reach a point. Point (b) is a point slightly within the saturated region from the saturated gas line G. The refrigerant in the capillary tube 106 is slightly supercooled from the condensation temperature T15 and reaches the inlet portion 10.
6a is (c) point, entrance) 10' Omm 106 b
3001 nM106c from the entrance corresponds to point (e).

At this time, since the temperature difference between points (b) and (b) is about 5 deg, the connection pipe 104 and capillary tube 106
Almost no heat exchange takes place in the heat exchange section, and point (e) is on the saturated liquid line, so the change is the same as the change in the conventional example (dotted chain line in the figure).

Next, the outside temperature of 3o''C will be explained with reference to FIG.

The refrigerant is cooled from point (F) to point (G) in the first condenser 103, but under these conditions the heat dissipation capacity is insufficient, so point (G) is in the superheated gas region and condenses at the temperature. The temperature is about 10 degrees higher than the temperature T3 degrees. Under these conditions, the refrigerant in the capillary tube 106 is hardly supercooled, and the inlet part 106a is almost above the saturated liquid line (g), and the point 106b 100 mm from the inlet is (point 1, point 3).
00mm The point 106c is the (nu) point.

At this time (because the temperature difference between the force point and the point (G) is about 15 degrees, the connecting vibrator 104 and the capillary tube 10
The capillary tube 106 exchanges heat with the capillary tube 106, and the (nu) point is heated, making it a dryer refrigerant than before.
The flow path resistance is slightly increased, which is the same as the state in which the heater 6 is energized in the conventional improved example, and the amount of pressure reduction is increased compared to the conventional example (dotted dotted line in the figure).

In other words, in this embodiment, even if the capillary valve 106 is selected to be appropriate at an outside temperature of 15°C, as the outside temperature rises, the amount of pressure reduction will increase accordingly, and the amount of pressure reduction will always be appropriate. It is something that can be maintained and allows for the most efficient operation.

Effects of the Invention As is clear from the above explanation, the refrigeration system according to the present invention exchanges heat between a part of the upstream part of the condenser and a part of the capillary tube, and the heat exchange part with the capillary tube of the condenser When the outside temperature is lower than about 16°C, condensation starts, and as the outside temperature rises above 15°C, the overheating state becomes greater. Therefore, by selecting the amount of pressure reduction in the capillary tube that is appropriate at an outside temperature of 15°C, the amount of pressure reduction in the capillary tube and condenser will be approximately the same as normal under this condition, and as the outside temperature increases, the amount of pressure reduction between the capillary tube and condenser will decrease. The amount of heat exchanged in the heat exchange section increases, the degree of dryness within the capillary tube increases, and the flow path resistance increases. As a result, the amount of pressure reduction in the capillary chest becomes higher than normal, and the amount of pressure reduction in the capillary chest changes according to the outside temperature, so the appropriate amount of pressure reduction is always maintained and the most efficient operation is possible. It is something.

In addition, this pressure reduction amount control does not require any electrical input, etc.
Since this is carried out by the self-control of the refrigeration equipment, 100% efficiency improvement can be achieved by optimizing the amount of pressure reduction.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between the amount of pressure reduction and the efficiency of the refrigeration system. Fig. 2 is a schematic diagram of a conventional improved system, Fig. 3 is a diagram showing changes in the amount of reduced pressure in a conventional improved refrigeration system, Fig. 4 is a schematic diagram of a refrigeration system according to an embodiment of the present invention, and Fig. 5 is a schematic diagram of a refrigeration system according to an embodiment of the present invention. Mollier diagram change diagram of the refrigeration equipment at an outside temperature of 16°C according to Fig. 4,
Figure 6 shows Mollier diagram changes at an outside temperature of 30°C. 1.102-': j7 pretusa, 2.103, 105゛... capacitor, 3,106... capillary tube, 4, 107... evaporator,
5,108...Zakujon pipe, 104...
... Connecting tube (heat exchange section between capillary top and condenser). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 2 Figure 3 Warm up the concubine - Figure 4 IO'/

Claims (3)

[Claims] (1) A refrigeration system comprising a compressor, a condenser, a capillary tube, an evaporator, and a suction line, and in which a part of the upstream part of the condenser and a part of the cavity recess are thermally connected. (2) The refrigeration system according to claim 1, wherein the capacitor is composed of a plurality of capacitors, and a connecting portion between an upstream capacitor and a downstream capacitor is thermally connected to a part of the capillary chest. Device. (3) The refrigeration apparatus according to claim 1 or 2, wherein the joint between the capillary tube and the condenser is an upstream portion of the capillary tube.