JPS608678A - Refrigeration equipment - 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 Industrial Application The present invention relates to a refrigeration device such as a refrigerator that uses a rotary compressor and a capillary tube as a pressure reducer.
In particular, it relates to resistance control of capillary tubes and refrigerant amount control within a refrigeration system.

Structure of the conventional example and its problems A conventional refrigeration system for, for example, a refrigerator has a rotary compressor 1, as shown in FIG. Capacitor 2. Capillary tube 3. The evaporators 4 are successively connected to form a refrigeration system. As shown in Fig. 2, the resistance of the capillary tube 3 is different from the capillary resistances B and C at the outside air temperature of 30°C and 15°C, and the rate of increase/decrease in the power consumption of the refrigerator. A is set.

This is selected so that the power consumption is the lowest when designing with one capillary tube 3, but the outside temperature is 30'.
In C, the larger the capillary resistance, the lower the power consumption. Furthermore, at an outside temperature of 16° C., the smaller 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 C when the outside temperature is 15'', further power saving can be achieved.

Because the inside of the rotary compressor 1 is at high temperature and high pressure, a large amount of refrigerant dissolves in the refrigeration oil inside the rotary compressor 1, so the amount of refrigerant charged into the cooling system is smaller than that of a reciprocating compressor. requires 1.5 times the degree of correlation.

The amount of refrigerant in this rotary compressor 1 is determined by the temperature of the refrigerating machine oil (
It is determined by the refrigerant solubility, which is influenced by the outside 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, since the amount of refrigerant in the refrigeration system cannot be adjusted, the refrigerant device has been used with an appropriate gas meter for an outside temperature of 30° C., which has a small amount of appropriate gas. Therefore, the outside temperature 1
At 5° 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.

In other words, when the outside temperature is 30°C, the appropriate amount of refrigerant D1 is the outside temperature 16
If the amount of refrigerant in the refrigeration system can be controlled so that the amount of refrigerant is the appropriate amount E, further power savings can be achieved.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to control the resistance of a capillary tube and the amount of refrigerant in the refrigeration system to optimally operate the refrigeration system and save power in refrigerators and the like.

Structure of the Invention In order to achieve this object, the present invention provides a first
capillary tube and a small number of resistors.

Two gearillary tubes are connected in parallel, and a receiver chamber capable of storing a predetermined amount of refrigerant is provided at the inlet of the first capillary tube. For example, a pressure-operated on-off valve that is opened is connected from below the liquid receiver chamber, and when the outside temperature is low, the pressure-operated on-off valve is opened and a second valve with lower resistance is connected to the lower part of the liquid receiver chamber. The amount of refrigerant circulating within the refrigeration system is increased by flowing refrigerant into the capillary tube of the refrigeration system without accumulating liquid refrigerant in the liquid receiver. Also, when the outside temperature is high,
The pressure-operated on-off valve is closed to allow the refrigerant to flow through the first capillary tube with a large resistance, and the liquid refrigerant is stored in the liquid receiver to reduce the amount of refrigerant circulating within the refrigeration system. .

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. 1o is a second capillary tube that bypasses the first capillary tube 8. 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 the second outlet pipe 13, and the resistance of the first capillary tube 8 connected to the second capillary tube 10 is set to be larger than the resistance when using a conventional single capillary tube. The resistor is selected so that it consumes the least amount of power at an outside temperature of 30°C. Okay, second capillary tube 10
The resistance is set smaller than before, and the outside temperature 1
The resistance is selected so as to have the lowest power consumption at 6°C. Next, the configuration of the refrigerant control valve 7 will be explained.

Reference numeral 14 denotes an upper casing having an inlet pipe 11 in the upper part, a first outlet pipe 12 below, and a second outlet pipe 13.

Reference numeral 17 denotes a lower casing having a heat-sensitive cylinder 16 via a pressure guiding part 16, an outer shell 18 formed by both casings 14 and 17, and a pressure-sensitive chamber 20 formed inside by a pressure-responsive element 19 and the lower casing 17. and a valve chamber 21. Furthermore, 22 is a block disposed in the upper casing 14 in the second part from the second outlet pipe 13, and by fixing this block 22 integrally, the liquid receiver chamber 23 and the valve chamber 21 are partitioned. There is.

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

The valve seat 26 of the ball valve 25 and the guide 2 are attached to the pulley 22.
7 is integrally formed. The guide 27 is provided with a refrigerant passage hole 28. The valve seat 26 has a liquid receiver chamber 23.
When the ball valve 25 is open, all of the liquid refrigerant in the liquid receiver chamber 23 is sent into the refrigeration system and into the second outlet pipe 13 and the second capillary tube 10. This serves as a refrigerant passage. A spring 30 is provided in the pressure sensitive chamber 2o, and presses the ball valve 25 against the valve seat 26 with a predetermined biasing force. The pressure sensitive chamber 2o is filled with the same refrigerant as the refrigeration system. Pressure sensitive chamber 20
The heat-sensitive cylinder 16 communicating with the outside air temperature is fixed at a location where the outside temperature is sensed. In other words, a pressure corresponding to the outside air temperature acts inside the pressure sensitive chamber 20, and the outside air temperature is below a predetermined value (in the present invention, 2
0° C. or below), the ball valve 26 is configured to close when the pressure responsive element 19 is displaced.

In the above configuration, when the outside air temperature is 30° C., the ball valve 25 is closed. Therefore, the refrigerant is transferred to the rotary compressor 5. as shown by the solid arrow. Condenser 6, receiver chamber 2
3. 8. First capillary tube with higher resistance. It circulates to the evaporator 9 and is cooled. At this time, the ball valve 25
Since the valve is closed, the refrigerant that has entered the receiver chamber 23 is cooled at the outside air temperature and flows into the receiver chamber 23 as liquid refrigerant 31 up to the height of the first outlet pipe 12, as shown in FIG. The amount of refrigerant that accumulates and circulates through the refrigeration system is smaller than the amount of refrigerant that is sealed. This means that even though the refrigerant in the refrigeration system is sealed in a large amount to maintain an appropriate outside temperature of 15°C,
The amount of refrigerant that is not circulated and remains in the chamber 3 ensures an appropriate amount of refrigerant to be circulated when the outside temperature is 3oC. Therefore, it is possible to operate with the optimal capillary resistance and refrigerant amount at an outside temperature of 30°C, and to minimize power consumption.Next, when the outside temperature is 16°C, the ball valve 26 is open. Therefore, the refrigerant is circulated to the rotary compressor 6, the receiver chamber 23, the valve chamber 21, the second capillary tube 10 with low resistance, and the evaporator 9 for cooling, as shown by the chain arrow. Gas refrigerant also circulates through the first capillary tube 8, but since the second capillary tube 10 has lower resistance, most of the refrigerant flows through the second capillary tube 1.
Flows to 0.

At this time, since the ball valve 26 is open, the liquid receiver chamber 23
The refrigerant that has entered the through hole 2 does not accumulate as a liquid refrigerant.
9 through the valve chamber 21 to the second capillary tube 10
Therefore, the entire amount of refrigerant sealed 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 16°C, and operation can be performed with the optimal capillary resistance and refrigerant amount at an outside temperature of 16°C. , power consumption can be minimized.

Therefore, the optimum amount of refrigerant and the optimum capillary resistance are controlled according to the outside temperature, so the most efficient operation can be achieved and a significant power saving effect can be obtained.The effect of the invention is clear from the above explanation. Similarly, the present invention provides a liquid receiver in which a first capillary tube with a large resistance and a second capillary tube with a small resistance are connected in parallel, and a predetermined amount of refrigerant can be stored at the inlet of the first capillary tube. the inlet of the second capillary tube is connected from below the receiver chamber via a valve body that responds to outside temperature;
When the outside temperature is low, the valve body opens and the refrigerant flows into the second capillary tube, which has lower resistance than the refrigerant hole in the valve seat on the bottom of the receiver chamber, for example. Refrigerant does not accumulate in the refrigeration system, and the amount of refrigerant circulating within the refrigeration system increases. Also, when the outside air temperature is high, the valve body is closed and the liquid refrigerant flows from the outlet pipe at the top of the receiver chamber to the first capillary tube with high resistance, so that liquid refrigerant accumulates inside the receiver chamber. Since the amount of refrigerant circulating within the refrigeration system is reduced, it is possible to control the optimal amount of refrigerant and capillary resistance according to the outside temperature, resulting in the most efficient operation and significant power savings. can.

[Brief explanation of drawings]

Figure 1 is a system diagram of a conventional refrigeration system, and Figure 2 is a system diagram of a conventional refrigeration system.
Figure 3 is a characteristic diagram of the capillary resistance and power consumption in the system shown in Figure 1. Figure 4 is a characteristic diagram of outside air temperature and appropriate amount of refrigerant in the system shown in Figure 1. Figure 4 shows an embodiment of the refrigeration system of the present invention. Shows a system diagram. 5... Rotary compressor, 6... Condenser, 7... Refrigerant control valve, 8... First capillary tube, 1o...・Second capillary tube, 11... Inlet tube, 12...
...first outlet pipe, 13...second outlet pipe,
23...Receiver chamber, 25...Valve body (ball valve) 0 Name of agent Patent attorney Toshio Nakao and 1 other person 1st
Figure 2.

Claims (1)

[Claims] a high-pressure vessel type rotary compressor, a condenser, a refrigerant control valve, a first capillary tube, a second capillary tube having a resistance smaller than that of the first capillary tube; an evaporator with a second capillary tube both connected to the inlet side, the refrigerant control valve being located above the inlet tube connected to the wake of the condenser and connected to the first capillary tube. a liquid receiver chamber equipped with a first outlet pipe; and a liquid receiver chamber connected from below to the second capillary tube via a valve body that responds to the outside air temperature and opens when the outside air temperature is low. and a second outlet pipe.