JPH0356389B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to refrigeration equipment such as refrigerators that use a rotary compressor and a capillary tube as a pressure reducer. This is related to controlling the amount of refrigerant within the device.

Conventional configuration and its problems As shown in Figure 1, a conventional refrigerator refrigeration system is constructed by sequentially connecting a rotary compressor 1, a condenser 2, a capillary tube 3, and an evaporator 4. are doing. The resistance of the capillary tube 3 is as shown in FIG.
Capillary resistance B, C at outside temperature of ℃ and 15℃
The rate of increase/decrease in power consumption of the refrigerator is different, and resistance A is established as an intermediate value.

This is selected so that it will consume the least amount of power when designed with a single capillary tube 3.
At an outside temperature of 30°C, a rod with a large capillary resistance will consume less power. Also, the outside temperature is 15
At ℃, the lower the capillary resistance, the lower the power consumption. That is, if the capillary resistance can be controlled so that the capillary resistance becomes B when the outside temperature is 30°C and the capillary resistance becomes C when the outside temperature is 15°C, further power savings can be achieved.

Also, since the inside of the rotary compressor 1 is at high temperature and high pressure, a large amount of refrigerant dissolves in the refrigerating machine oil inside the rotary compressor 1, so the amount of refrigerant charged into the cooling system is smaller than that of a reciprocating compressor. Approximately 1.5 times that amount is required.

The amount of refrigerant in the rotary compressor 1 is determined by the refrigeration solubility, which is influenced by the temperature of the refrigeration oil (particularly the outside air temperature).

That is, when the outside air temperature becomes low, a large amount of refrigerant is required in the rotary compressor because more of the refrigerant is dissolved. Therefore, as shown in FIG. 3, the appropriate amount of refrigerant for the refrigeration system increases as the outside temperature decreases. Conventionally, it was not possible to adjust the amount of refrigerant in the refrigeration system, so the appropriate amount of gas was small, and the appropriate amount of gas D at an outside temperature of 30℃
was used as a refrigerant device. Therefore, at an outside temperature of 15° C., the amount of refrigerant E is small compared to the appropriate amount, so the evaporator 4 is currently operating in a gas-starved state. That is, if the amount of refrigerant in the refrigeration system can be controlled so that the amount of refrigerant is the appropriate amount D when the outside temperature is 30.degree. C. and the amount E is the appropriate amount of refrigerant when the outside temperature is 15.degree. C., further power savings can be achieved.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to control the resistance of a capillary tube and the amount of refrigerant in the refrigeration system, thereby achieving optimal operation of the refrigeration system and saving power in refrigerators and the like.

Structure of the Invention In order to achieve this object, the present invention connects a first capillary tube with a large resistance and a second capillary tube with a small resistance in parallel, and connects a predetermined capillary tube to the inlet of the first capillary tube. A receiver chamber capable of storing an amount of refrigerant is provided, and a pressure-operated on-off valve, which opens when the outside air temperature becomes low, is connected to the inlet of the second capillary tube from below the receiver chamber. When the outside temperature is low, the pressure-operated on-off valve is opened and the refrigerant is allowed to flow from below the receiver chamber to the second capillary tube with lower resistance, without accumulating liquid refrigerant in the receiver. Increase the amount of refrigerant circulating within the refrigerant system. In addition, when the outside air temperature is high, the pressure-operated on-off valve is closed to allow the flow to flow through the first capillary tube with a large resistance, and the liquid refrigerant is stored in the receiver and the refrigerant is circulated within the refrigeration system. This is to reduce the amount.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 4, 5 is a high-pressure container type rotary compressor, 6 is a condenser, 7 is a refrigerant control valve, 8 is a first capillary tube, and 9 is an evaporator, which are connected in a ring. 10 is the first
This is a second capillary tube that bypasses the capillary tube 8 of FIG. 11 is an inlet pipe of the refrigerant control valve 7, which is connected to the condenser 6; 12 is the first inlet pipe;
The outlet pipe 12 is connected to the first capillary tube 8 . 13 is a second outlet pipe 13;
It is connected to the second capillary tube 10. The resistance of the first capillary tube 8 is set to be larger than the resistance when using a conventional single capillary tube, and is selected so that it will consume the least amount of power at an outside temperature of 30°C. are doing. Further, the resistance of the second capillary tube 10 is set smaller than that of the conventional capillary tube, and is selected so as to consume the least amount of power at an outside temperature of 15°C.

Next, the configuration of the refrigerant control valve 7 will be explained. 1
4 is an upper casing having an inlet pipe 11 at the top, a first outlet pipe 12 below, and a second outlet pipe 13. 17 is a lower casing having a heat-sensitive cylinder 16 via a pressure guiding part 15, and both casings 14, 1
7 forms an outer shell 18, and the inside is covered with the pressure responsive element 1.
9 and a pressure sensitive chamber 20 formed by the lower casing 17
and a valve chamber 21. Furthermore, 22 is the second
By integrally fixing this block 22, which is placed in the upper casing 14 above the outlet pipe 13, the receiver chamber 23 and the valve chamber 21
It is divided into

A valve body (hereinafter referred to as a ball valve) is attached to the side surface of the valve chamber 21 of the pressure responsive element 19 via a spacer 24.
25 are integrally installed.

A valve seat 26 of a ball valve 25 and a guide 27 are integrally formed in the block 22. Guide 27
A refrigerant passage hole 28 is provided in the refrigerant passage hole 28 . Also, valve seat 2
6 is provided with a through hole 29 that penetrates to the liquid receiver chamber 23, and when the ball valve 25 is open, all of the liquid refrigerant in the liquid receiver chamber 23 flows down into the refrigeration system.
Second outlet pipe 13, second capillary tube 1
This serves as a refrigerant passage to 0. A spring 30 is provided in the pressure sensitive chamber 20, and a ball valve 25
is pressed against the valve seat 26 with a predetermined urging force. The pressure sensitive chamber 20 is filled with the same refrigerant as that of the refrigeration system. A heat-sensitive tube 16 communicating with the pressure-sensitive chamber 20 is fixed at a location for sensing outside air temperature. In other words, a pressure corresponding to the outside air temperature acts inside the pressure sensitive chamber 20, and when the outside air temperature falls below a predetermined value (20° C. or below in the present invention), the ball valve 25 closes due to the displacement of the pressure responsive element 19. It is composed of

In the above configuration, when the outside air temperature is 30° C., the ball valve 25 is closed. Therefore, the refrigerant is circulated to the rotary compressor 5, the condenser 6, the receiver chamber 23, the first capillary tube 8 having a large resistance, and the evaporator 9 for cooling, as shown by the solid arrow. At this time, since the ball valve 25 is closed, the refrigerant that has entered the liquid receiver chamber 23 is cooled at the outside air temperature and is received as liquid refrigerant 31 up to the height of the first outlet pipe 12, as shown in FIG. The amount of refrigerant that accumulates in the container chamber 23 and circulates through the refrigeration device is smaller than the amount of refrigerant sealed. This means that the refrigerant in the refrigeration system is at an outside temperature of 15
Despite the large amount of refrigerant being sealed to maintain the appropriate temperature at outside temperature of 30°C, the amount of refrigerant that remains in the receiver chamber 23 without being circulated makes it difficult to estimate the appropriate amount of refrigerant to be circulated when the outside temperature is 30°C. secure. Therefore, it can be operated with the appropriate capillary resistance and refrigerant amount at an outside temperature of 30°C.
Power consumption can be minimized.

Next, when the outside air temperature is 15° C., the ball valve 25 is open. Therefore, as shown by the chain arrow, the refrigerant is
Rotary compressor 5, receiver chamber 23, valve chamber 2
1. Second capillary tube with low resistance 1
0, circulates to the evaporator 9 for cooling. Although the gas refrigerant also circulates in the first capillary tube 8, most of the refrigerant flows to the second capillary tube 10 because the second capillary tube 10 has lower resistance.

At this time, since the ball valve 25 is open, the refrigerant that has entered the receiver chamber 23 flows from the through hole 26 to the second capillary tube 10 through the valve chamber 21 without accumulating as liquid refrigerant. , the entire amount of refrigerant enclosed in the refrigeration system is circulated. The refrigerant in the refrigeration system is sealed so that it is appropriate for an outside temperature of 15°C, so the amount of refrigerant is appropriate at an outside temperature of 15°C, and operation can be performed with the optimal capillary resistance and refrigerant amount at an outside temperature of 15°C. , power consumption can be minimized.

Therefore, since the amount of refrigerant and the capillary resistance are controlled to be optimal depending on the outside temperature, the most efficient operation can be achieved and a significant power saving effect can be obtained.

Effects of the Invention As is clear from the above description, the present invention connects a first capillary tube with a large resistance and a second capillary tube with a small resistance in parallel,
A receiver chamber capable of storing a predetermined amount of refrigerant is connected to the inlet of the first capillary tube, and a valve body that responds to the outside temperature is connected to the inlet of the second capillary tube from below the receiver chamber. When the outside temperature is low, the valve body is opened and the refrigerant flows to the second capillary tube, which has lower resistance than the refrigerant hole in the valve seat on the bottom of the receiver chamber. Therefore, the refrigerant does not accumulate in the liquid receiver, and the amount of refrigerant circulating within the refrigeration system increases. In addition, when the outside air temperature is high, the valve body is closed and the liquid refrigerant flows from the outlet pipe in the upper part of the liquid receiver chamber to the first capillary tube with high resistance, so that liquid refrigerant accumulates in the liquid receiver chamber and Since the amount of refrigerant circulating inside is reduced, the amount of refrigerant and capillary resistance can be controlled to be optimal depending on the outside temperature, resulting in the most efficient operation and significant power savings.

[Brief explanation of drawings]

Figure 1 is a system diagram of a conventional refrigeration system, Figure 2 is a characteristic diagram of capillary resistance and power consumption in the system shown in Figure 1, and Figure 3 is the outside temperature and appropriate amount of refrigerant in the system shown in Figure 1. Characteristic diagram, 4th
The figure shows a system diagram showing an embodiment of the refrigeration system of the present invention. 5... Rotary compressor, 6... Condenser, 7... Refrigerant control valve, 8... First capillary tube, 10... Second capillary tube,
11... Inlet pipe, 12... First outlet pipe, 13...
...Second outlet pipe, 23...Liquid receiver chamber, 25...Valve body (ball valve).

Claims (1)

[Claims] 1. A high-pressure container type rotary compressor, a condenser, a refrigerant control valve, a first capillary tube, and a second capillary tube having a resistance smaller than that of the first capillary tube.
an evaporator to which the first capillary tube and the second capillary tube are connected; a valve chamber that communicates with the chamber and is divided by blocks; a valve body provided on the valve chamber side that opens and closes the through hole of the block; a pressure sensitive chamber that contracts due to outside temperature and opens and closes the valve body; and the liquid receiver. an inlet pipe connecting the chamber and the wake of the condenser; a first outlet pipe located above the receiver chamber and connected to the first capillary tube; and a second outlet pipe provided in the valve chamber. A refrigeration device comprising a capillary tube and a second outlet pipe connected to the capillary tube.