JPS5899676A - Fluid control valve for 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 The present invention relates to improvements in fluid control valves used in refrigeration systems.

A conventional general refrigeration system has a compressor 2 as shown in Figure 3.
1. Condenser 22. Squeezing device 23. The evaporators 24 are successively connected to form a refrigeration cycle. In the refrigeration cycle, the compressor 2 is controlled by a thermostat (not shown).
1 is under operation control, and this thermostat's [0F
During FJ, superheated refrigerant gas that has no refrigerating effect and remains in the condenser 22 flows into the evaporator 24 through the throttling device 23, heats the evaporator 24, and reduces the operating rate of the compressor 21. This has the disadvantage of increasing power consumption. In order to eliminate the above-mentioned drawbacks, recent refrigeration systems include a solenoid valve 33 between the condenser 31 and the throttle device 32 as shown in FIG.
The electromagnetic valve 33 is set to an open state when the refrigeration system is in ONJ mode and closed when the refrigeration system is in operation, and is closed when the refrigeration system is stopped in 0FFJ mode. It is known that the overheated refrigerant gas is prevented from flowing into the evaporator 34, and the temperature of the evaporator 34 is prevented from rising, thereby reducing power consumption.Note that 36 is a compressor.

However, in a refrigeration system using the above-mentioned solenoid valve 33, the output is 1.
Small refrigeration systems before and after oOW have the disadvantage that the reduction in power consumption is offset by the 6 to 6 W of power consumed by the solenoid valve-vege 33.

Ta. In view of this drawback, the present applicant has made the low-pressure side pressure of the refrigeration system and atmospheric pressure act before and after the pressure-responsive element, and when the low-pressure side pressure rises to a predetermined pressure based on atmospheric pressure, the pressure-responsive element We have proposed a fluid control valve that closes a valve device interposed in a refrigeration system using a connected valve body and opens when the pressure drops below a predetermined level. It is an object of the present invention to provide a valve device that opens and closes based on the temperature of an object to be cooled.

In other words, the present invention applies the internal pressure of a heat-sensitive cylinder brought into contact with the object to be cooled and the internal pressure of the refrigeration system to the front and back of a pressure-responsive element, and ensures accurate valve opening and closing operations using a valve device connected to the refrigeration system. The aim is to reduce power consumption.

Below, a fluid control valve according to an embodiment of the present invention is used as a refrigerant.
8-9967B2) An example of application to a refrigeration system using R12 will be explained with reference to the drawings.

In the figure, 1 is a compressor, 2 is a condenser, 3 is a throttle device,
Reference numeral 4 indicates a fluid control valve according to the present invention, and reference numeral 5 indicates an evaporator, which are successively connected in an annular manner to constitute a refrigeration cycle. The fluid control valve 4 is entirely composed of an upper casing 6 and a lower casing 7, and is provided with a pressure-responsive element 8 so as to partition the entire interior into two upper and lower chambers. The upper casing 6 communicates with the heat-sensitive cylinder 9,
A heat-sensitive part 10 is formed at the tip of the heat-sensitive tube 9, and a sealing opening 1 for completely filling the refrigerant inside the heat-sensitive tube 9 is further formed at the tip.
0a is provided. Further, the heat sensitive section 10 is formed. Further, the refrigerant sealed in the heat-sensitive tube 9 is the same refrigerant R-12 as the refrigerant circulating inside the refrigeration system,
The amount enclosed is slightly larger than the internal volume of the heat-sensitive cylinder pressure chamber 11 in a liquid state at room temperature. Furthermore, the heat-sensitive portion 1o is brought into contact with the object to be cooled in the refrigeration apparatus (in the case of a refrigerator, the air inside the refrigerator).

On the other hand, the valve chamber 12 formed by the lower casing 7 and the pressure responsive element 8 of the fluid control valve 4 has a valve seat body 13 and a valve body 14.
Stopper 16, 7A7 gear 16. The upper seven ranks 16a'i of the plunger 16, the spring 17 that biases the pressure responsive element 8, the inlet nozzle 18a, and the outlet vibrator 1.
8b constitutes a valve device 19. The valve body 14 is fixed to the lower end of the plunger 16, and opens and closes the valve device 19 by displacement of the pressure responsive element 8. Further, the inlet vibrator 18a is a diaphragm device 3 of a high-pressure circuit of a refrigeration system.
The outlet tube 18b is connected to the input side of the evaporator 60. In this embodiment, the predetermined cooling temperature is -18C (saturation pressure 1.66Kg/ty).
lbg ), the internal pressure of the evaporator 6 during operation is designed to be -3oC (saturation pressure 1.o2Ky7abs). Further, the biasing force of the spring 17 is set to 2.I Kp based on the cross-sectional area 7.1o+f of the pressure responsive element 8. That is, when the pressure difference is 0 and aKg/cfIl, the pressure responsive element 8 is balanced.

The amount of refrigerant sealed in the heat-sensitive cylinder 9 of the fluid control valve 4 of the present invention is in a liquid state equal to or larger than the internal volume of the heat-sensitive cylinder pressure chamber 11, and the fluid control valve 4 is provided at the inlet of the evaporator 5. Therefore, the temperature of the heat-sensitive cylinder pressure chamber 11 also decreases to -3Or during operation. As is well known, the refrigerant enclosed in a sealed container condenses at the lowest temperature, so the heat-sensitive cylinder pressure chamber 11 is filled with liquid. Therefore, the heat-sensitive cylinder pressure chamber 11 is not at a saturation pressure of -300, but at the pressure of the heat-sensing section 1o where the gas refrigerant is present (-18C saturation pressure 1, 66K
It is a matter of course that the result will be (g/cnl a b s ).

In other words, this fluid control valve opens when the temperature of the evaporator 6 becomes 6C or more lower than the temperature of the object to be cooled, and closes when the difference between the temperature of the evaporator 5 and the temperature of the object to be cooled becomes 6C or less.

Next, the operation of the refrigeration system to which the fluid control valve 4f having the above structure is applied will be explained.

FIG. 1 shows the state during operation, and the valve device 19- of the fluid control valve 4, which is a low pressure circuit, and the inside of the evaporator 5 and the valve chamber 12 are 1
602Kg/cmab8, the temperature of the object to be cooled is slightly higher than the predetermined temperature (-1SC), and therefore the inside of the heat sensitive tube pressure chamber 11 is 1.7Kg1ctdabs, so the pressure responsive element 8 is a spring. 2. In relation to the urging force of 17. The valve device 19 is urged downward by the force of yKy and maintains an open state. In other words, the refrigeration system is in a normal state and regular refrigeration is being performed.

Next, FIG. 2 shows the state when the engine is stopped. When the compressor 1 stops, highly superrefrigerant flows into the evaporator 5 through the throttle device 3 due to the pressure difference between the condenser 2 and the distiller 6, and the inside of the evaporator 6 and the valve chamber 1
The pressure inside 2 increases. At this time, since the object to be cooled has been cooled to below -18C, the pressure chamber 11 of the thermosensitive tube is 1.6K.
Since it is about ylcrla b s, the valve chamber 12
When the internal pressure rises to 1.30 μibs, that is, the temperature of the evaporator 5 rises to 124 tl', the valve device 19 is closed to prevent high-temperature refrigerant from flowing into the evaporator 5. Next, when the compressor 1 is started again, the valve device 19 remains closed, but since the lower LAKp/cd becomes lower, the upper and lower devices 19 of the pressure responsive element 8 are opened, resulting in the above-mentioned operating state.

Although there is a slight amount of high-temperature refrigerant flowing into the evaporator 5 when the system is stopped,
Since the valve device 19 is closed in a state where the temperature is 5° lower than the temperature of the object to be cooled, there is almost no increase in the cooling load after restart.

As is clear from the above description, the fluid control valve according to the present invention applies the internal pressure of the heat-sensitive cylinder whose heat-sensitive portion is brought into contact with the object to be cooled to one side of the pressure-responsive element that divides the interior into two chambers, and the other side. a fluid control valve main body; Since the heat-sensitive top of the pressure-responsive element inside is filled with liquid, even if a fluid control valve is installed at the outlet of the throttle device, the pressure of the heat-sensitive cylinder acting on the pressure-responsive element remains saturated to accurately match the temperature of the object to be cooled. The pressure can be obtained and the valve device can be operated to maintain the evaporator at a state lower than this pressure, the evaporator can always be kept lower than the object to be cooled, and unnecessary increases in heat load can be prevented. Since its operation is based on the original temperature of the object to be cooled, it is completely unrelated to changes in the cooling temperature setting and prevents high-temperature refrigerant from flowing into the evaporator.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the operating state when a fluid control valve according to an embodiment of the present invention is applied to a refrigeration system, Fig. 2 is a sectional view of the stopped state of Fig. 1, and Fig. 3 is a refrigeration cycle of a conventional example. 4 and 4 respectively show refrigeration cycle diagrams of conventional improved examples. 2... Condenser, 5... Evaporator, 8...
...Pressure responsive element, 9...Thermosensitive tube, 1o...
・Heat-sensitive part, 11... Heat-sensitive cylinder pressure chamber, 12...
・Valve chamber, 19... Valve device. Name of agent: Patent attorney Toshio Nakao and 1 other person11
2 Figure 13 Figure? ? ? 4 Figure 14＼, 4

Claims (2)

[Claims] (1) Internal 'ff: A pressure-responsive element divided into two chambers, on which the internal pressure of the heat-sensitive cylinder whose heat-sensitive part is brought into contact with the object to be cooled is applied, and on the other face, the low pressure of the refrigeration system is applied. A fluid control valve for a refrigeration system, which is equipped with a valve device that opens and closes according to the displacement of the pressure-responsive element, and this valve device is connected to a high-pressure circuit of the refrigeration system. (2) With respect to the volume of the heat-sensitive cylinder pressure chamber in the fluid control valve body of the heat-sensitive cylinder, the amount of refrigerant sealed in the heat-sensitive cylinder in a liquid state is set to be greater than the volume of the heat-sensitive cylinder pressure chamber. A fluid control valve for a refrigeration system as described in 2.