JPS61140776A - Freezer for refrigerator, etc. - 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 a refrigeration device having a capillary tube as a refrigerant flow rate regulator in a refrigerator, showcase, etc.

The structure of the conventional example and its problems will be explained with reference to FIG. A refrigeration system installed in a refrigerator or the like is generally constructed by sequentially connecting a compressor 1', a condenser 2', a capillary tube 3', and an evaporator 4' in an annular manner. Among these components, the capillary tube 3', which plays the role of a refrigerant flow rate regulator in the refrigeration system, is usually connected in series between the condenser 2' outlet and the evaporator 4' inlet, and The function is to reduce the pressure of the condensed liquid refrigerant in the vessel 2', and to evaporate it at a predetermined temperature in the evaporator 4'. Normally, this capillary tube 3' is selected to have the optimum resistance for each refrigeration equipment by combining the tube inner diameter and length, and this is used as the representative resistance so that the maximum capacity can be demonstrated at times of high outside temperature and high load. It is used under various load conditions. However, when the load on the refrigeration system decreases due to a drop in outside air temperature, etc., the capillary tube 3, which is a refrigerant flow rate regulator, responds accordingly.
It is preferable to select a resistance of ' for efficient operation of the refrigeration system, and it also reduces power costs. However, with the conventional system in which one capillary tube 3' is normally connected in series between the condenser 2' outlet and the evaporator 4' inlet, it is not easy to adjust the refrigerant flow rate according to the load.

Objective 3 of the Invention: The objective of the present invention is to improve the operating efficiency of a refrigeration system.

Structure of the Invention The present invention includes a first capillary tube controlled by a temperature-type on-off valve;
A second capillary tube that is not controlled is provided, and when the outside temperature is high and the load is normal, the flow rate is controlled only by the second capillary tube, and when the outside temperature is low, the flow rate is controlled by a double-clawed capillary tube using a temperature-type on-off valve that is occasionally opened. The flow rate is adjusted according to the load.

DESCRIPTION OF THE EMBODIMENTS The configuration of an embodiment of the present invention will be explained below with reference to FIG. The high temperature, high pressure refrigerant compressed by the compressor 1 is liquefied in the condenser 2. At the outlet of the condenser 2, a first capillary tube 4 and a second capillary tube 6 are connected in parallel with the temperature type shut-off valve 3 and the first capillary tube 4, which are connected via a temperature-type shut-off valve 3. The other ends of the double-claw tubes 4 and 6 are connected to an evaporator 6. The temperature type on-off valve 2 has an outer shell A 3 a +
An outer shell B3b, a valve seat 3c provided in the outer shell B3b, an inlet vibe 3d connected to the outlet side of the condenser 2 upstream of the valve seat 3C, and a side surface of the outer shell B3b above the valve seat 3c. is provided with an outlet vibe 3e connected to the inlet side of the first capillary tube 4. 3f is a ball valve with a spherical tip that opens and closes the valve seat 3c. At the top of the ball valve 3f, there is a plunger 3h that transmits the displacement of a pressure responsive element 3g (hereinafter referred to as a diaphragm 3q) that airtightly divides the inside of the outer shell ASa into two chambers.
The ball valve 3f and the plunger 3h are fixed together by spot welding or the like. Chamber A on one side of diaphragm 3q
7, when the ball valve 3f is open, the high pressure of the refrigeration system acts, and when the ball valve 3f is closed, the low pressure of the refrigeration system acts. The chamber B8 has a temperature sensing tube 10 at its tip through a capillary tube 9,
A pressure is applied depending on the temperature of the temperature sensing cylinder 1o. Further, the temperature sensing tube 1o is installed so as to sense the temperature of the outside air or the temperature of the refrigeration cycle, such as the temperature of the condenser 2, etc., which shows a temperature change with the same tendency as the outside temperature. The spring 31 biases the thermostatic on-off valve 3 in the direction of opening, and this force can be adjusted by selecting the spring. The pressure characteristics of the thermosensor tube 1o are such that when the load is large or normal, the biasing force of the spring 31 acting on the lower surface of the diaphragm 3q and the opening direction of the ball valve 3f and the pressure in the chamber A7 A pressure that overcomes the resultant force acts. Further, when the temperature of the temperature sensing cylinder 10 becomes lower than the set temperature, a force is applied which overcomes the combined force of the urging force of the spring 31 acting on the lower surface of the diaphragm 3q and the pressure of the chamber A7.

The operation in such a configuration will be explained. When the load is large or under normal load, the temperature of the thermosensor cylinder 10 is high, so the temperature-type on-off valve 3 is closed, and the refrigerant liquefied in the condenser 2 flows through the second capillary tube 5. As a result, the liquid is evaporated at a predetermined temperature in the evaporator 6, and a normal cooling cycle is performed.

When the outside temperature drops and low load conditions occur, diaphragm 3
The pressure corresponding to the temperature of the temperature-sensitive tube 1o acting on the upper surface of the temperature-sensitive cylinder 1o is overcome by the combined force of the urging force of the spring 31 and the pressure of the chamber A7, and the temperature-type on-off valve 3 is opened. This allows condenser 2
The liquefied refrigerant is supplied to both the first capillary tube 4 through the second capillary tube 56b7'' and the temperature-type on-off valve 3, and is evaporated in the evaporator 6 at a predetermined temperature.

Setting the resistance of the first capillary tube 4 and the second capillary tube 5 is as follows:
When the outside temperature is high, the maximum cooling capacity can be obtained with the resistance of only the second capillary tube 5, and when the outside temperature is low, both capillary tubes 4,
5 is set so that the maximum cooling capacity is obtained when the refrigerant is flowing. 0 Therefore, by using the temperature type on-off valve 3, no electric power is required, and moreover, it utilizes the temperature of the thermosensor cylinder. Depending on the load, the refrigerant may be allowed to flow through the second capillary tube 5, or may be caused to flow through the first capillary tube 5. Second capillary tube 4
, 6, and in refrigeration equipment with capillary tubes, which was difficult to adjust the flow rate in the past,
This makes it possible to adjust the refrigerant flow rate according to the load using a relatively simple method, allowing economical operation of the refrigeration system and reducing power costs.

Effects of the Invention As is clear from the above embodiments, the present invention uses a temperature-type on-off valve that does not consume electricity, and when the outside temperature is high,
.

The refrigeration system is configured with only the second capillary tube, and when the outside temperature is low, the refrigeration system is configured through both the first and second capillary tubes via a thermostatic on-off valve to adjust the refrigerant flow rate. Therefore, efficient operation of the refrigeration system can be achieved. In addition, the temperature-type on-off valve has a temperature-sensing tube attached to the tip of the capillary tube, so by adjusting the length of the capillary tube, the temperature-sensing tube position can be appropriately selected depending on the refrigeration equipment. .

[Brief explanation of drawings]

FIG. 1 is a piping diagram of a refrigeration system according to an embodiment of the present invention, and FIG. 2 is a piping diagram of a conventional refrigeration system. 1... Compressor, 2... Condenser, 3...
...temperature type on-off valve, 4...first capillary tube, 6.
...Second capillary tube, 6...Evaporator, 3q.
...Diaphragm, 1o...Temperature-sensitive tube. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
figure

Claims (1)

[Claims] A compressor, a condenser, a temperature-type on-off valve, a first capillary tube, and an evaporator are piped in order in an annular manner, and a second capillary tube bypasses the temperature-type on-off valve, and one side of the pressure-responsive element of the temperature-type on-off valve. a temperature-sensitive cylinder that applies pressure in the refrigeration system to the other side of the pressure-responsive element and applies pressure according to outside air temperature to the other side of the pressure-responsive element, and opens a first capillary when the temperature of the temperature-sensitive cylinder becomes a predetermined temperature or less; A refrigeration device such as a refrigerator that closes the first capillary tube when the temperature exceeds a predetermined temperature.