JPS5899653A - 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 refrigeration equipment.

A conventional general refrigeration system has a compressor 2 as shown in FIG.
1. Condenser 22. Squeezing device 23. The evaporators 24 are successively connected to form a refrigeration cycle. In the refrigeration cycle, the compressor 21 is controlled by a thermostat (not shown).
The operation is controlled by this thermostat.
During FJ, superheated refrigerant gas that has no refrigerating effect and remains in the condenser 22 flows into the evaporator 24 via the throttle device 23, heats the evaporator 24, and increases 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 circuit is open when the refrigeration equipment inside is operating, and the circuit is closed when the refrigeration equipment is stopped at 0FFJ, so that the superheated refrigerant gas remaining in the condenser 31 flows into the evaporator 34. It is known that the temperature rise of the evaporator 34 is prevented and power consumption is reduced.The refrigeration system using the solenoid valve 33 described above is Then output 1
In small refrigeration equipment around 00W, the solenoid valve 33 consumes 6
~6W of power offsets the reduction in power consumption,
On the contrary, it had drawbacks such as increased power consumption.

In view of the above-mentioned drawbacks, the present invention is designed to displace a pressure-responsive element due to the pressure difference between the high-pressure circuit and the intermediate part of the throttle device during operation of the compressor, thereby closing the valve device interposed between the condenser and the evaporator, and When the machine is stopped, the high temperature refrigerant in the condenser can be prevented from flowing into the evaporator by closing the valve device by the displacement of the pressure responsive element due to substantially the same pressure difference.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a compressor, 2 is a condenser, 3 is a first throttle device, 4 is a second throttle device whose flow path resistance is smaller than that of the first throttle device, 6
is an evaporator, and the valve device 7 of the fluid control valve 6 is connected to the first. It is interposed between the second diaphragm devices 3 and 4.

The fluid control valve 6 is connected to the upper casing 8. The lower casing 9 constitutes an outer shell, and the inside is a high pressure chamber 1 with a pressure responsive element 1°.
It is divided into valve chamber 1 and valve chamber 1♀. The high pressure chamber 11 communicates between the compressor 1 and the condenser 2 through a pressure guiding pipe 13. A valve device 7 is provided in the valve chamber 12 between an inlet vibrator 14 connected to the outlet of the first throttle device 3 and an outlet vibrator 16 connected to the second throttle device 4, and the valve device 7 is connected to a valve seat body. 1
6 and a valve body 17 connected to the pressure responsive element 1o. Further, the valve body 17 is urged in a direction to close the valve device 7 by the urging force of a spring 18. In other words, the biasing force of the spring 18 and the stress-responsive element 10
When the pressure difference between the high pressure chamber 11 pressure and the valve chamber 12 pressure becomes larger than the set pressure difference ΔP0, the valve device 7 is closed; It is designed to be closed. Specifically, the set pressure difference ΔPo is set to be smaller than the pressure difference ΔP1 under operating conditions where the pressure difference between the high pressure chamber 11 and the valve chamber 12 is the lowest during operation. Furthermore, 1
9 is a stopper that prevents excessive movement of the valve body 17.

Next, the operation of the refrigeration system having the above configuration will be explained.

FIG. 1 is a state diagram during operation of the refrigeration system, and corresponds to A in the pressure change diagram shown in FIG. The pressure in the high pressure circuit is the pressure shown by the solid line in Figure 3 at the compressor 1 outlet, and the pressure at the condenser 2 outlet is shown by the dotted line in Figure 3 due to pressure loss. The pressure between the throttle 9 devices 3 and 4 is reduced by the first throttle device 3 and shows the pressure shown by the two-dot broken line in FIG. 3C. Further, the solid line at the beginning of FIG. 3 indicates the pressure inside the evaporator 6. As is clear from this figure, during operation, compressor 1
Exit and 1st. The pressure difference between the second throttling devices 3 and 4 is greater than the pressure difference ΔP1 at the minimum operating condition mentioned above.
P2, the pressure inside the high pressure chamber 11 of the fluid control valve 6 which communicates with the outlet of the compressor 1 through the pressure guiding pipe 13 and the first. The pressure difference in the internal pressure of the valve chamber 12 interposed between the second throttle devices 3 and 4 is also ΔP2.

The set pressure difference ΔP0 of the valve device 7 is ΔP0 minus ΔP1
Since the pressure responsive element 10 is set so as to be biased downward, the valve device 7 is closed. As a result, the refrigerant exhibits a normal flow of compressor 1 → condenser 2 → first throttle device 3 → valve device 7 of fluid control valve 6 → second throttle device 4 → evaporator 6 → compressor 1, Regular refrigeration is performed.

Next, the operation after stopping will be explained. The pressure change after stopping is the change shown in Figure 3. As is well known, compressor 1
When the operation of the throttling device 3-4 is stopped, the throttling device 3.4 becomes a pressure equalizing pipe, but it is constructed by connecting two throttling devices 3 and 4 in series as in the present invention, and the flow path resistance of the first throttling device 3 on the high pressure side is equalized. For those that are set smaller than the second throttle device 4 on the pressure side,
It is known that at this pressure equalization speed, the pressure across the first throttle device 9 is equalized, and then the pressure across the second throttle device 4 is equalized. Therefore, when the compressor is stopped, the influence of the pressure loss of the condenser 2- is first eliminated, and the pressures at the compressor 1 outlet and the condenser 2 outlet (Fig. 3 a, b) become the same at the same time as the stop. Next, the first. The pressure decreases to balance the pressure between the second expansion devices 3 and 4, and the pressure inside the high pressure chamber 11 communicating with the outlet of the hind leg compressor 1 and the pressure inside the first. The pressure difference between the pressure C between the second throttle devices 3 and 4 and the pressure inside the valve chamber 12 becomes ΔPo or less (FIG. 3A). As a result, the pressure-responsive element 10 is urged upward, and the valve body 17 connected to the pressure-responsive element 1o is urged toward the valve seat body 16, thereby closing the valve device 7. Therefore, the pressure of the refrigeration system is maintained in this state (FIG. 3C).

Next, the operation at restart will be explained. As the compressor 1 operates, the refrigerant remaining in the evaporator 6 is sucked and compressed, and the pressure on the high pressure side increases (see Figure 3).

However, the rate of pressure increase at this time becomes slower as the distance from the compressor 1 increases. The pressure of the high pressure chamber 11 of the fluid control valve 6 at the outlet of the block compressor 1 and in close communication therewith rises rapidly, and the pressure at the outlet of the condenser 2 gradually rises. Also number 1. The pressure between the second throttle devices 3 and 4 rises even more slowly. Therefore, the pressure difference between the high pressure chamber 11 and the valve chamber 12 of the fluid control valve 6 also increases.
20 or more (FIG. 3B), the pressure-responsive element 1o is displaced downward and the valve device 7 is opened.

Therefore, after a short period of time after the start of operation, the valve device 7 of the fluid control valve 6 is opened, the valve device is kept open during the operation, the hind leg valve device 7 is closed for a short period of time when the stop is stopped, and the valve device 7 of the fluid control valve 6 is kept open during the operation. Device 7
It maintains a closed circuit.

The short time has almost no adverse effect on the cooling operation of the refrigeration system.

As is clear from the above theory, the refrigeration system according to the present invention uses a pressure-responsive element to divide the interior into two chambers, and the displacement of the pressure-responsive element opens and closes the valve device connected to the pressure-responsive element. A first fluid control valve, a compressor, and a condenser configured in series. It is composed of a second throttle device, an evaporator, etc., and communicates the high pressure circuit side pressure with a chamber inside the fluid control valve,
The pressure between the first and second throttling devices is communicated with another chamber, and the valve device of the fluid 6 control valve is interposed between the condenser and the evaporator, so that the pressure in the two chambers is approximately equalized. Since the valve device is closed at times, the valve device is opened almost at the same time as operation without requiring electrical energy, and the circuit is kept open during operation, so there is no protection against refrigeration, and there is no need to stop the valve device. Since the valve device is closed almost at the same time and maintained closed during the stop, high-temperature gas in the condenser does not flow into the evaporator and increase the heat load, and the high-pressure side Because the pressure on the low pressure side is maintained at high pressure and the low pressure side at low pressure, regular refrigeration begins shortly after startup, making it possible to eliminate the idle operation time required in the past, resulting in significant energy savings. can be achieved. Furthermore, since the flow path resistance of the first throttle device is greater than that of the second throttle device, the pressure balance for closing the valve device after stopping is quick, and a large pressure difference with the low pressure circuit can be maintained. Therefore, the above-mentioned effects can be exhibited to a greater extent.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of the refrigeration system according to the present invention during operation;
Fig. 2 is a cross-sectional view of the refrigeration system when it is stopped, which corresponds to Fig. 1, Fig. 3 shows the pressure change of the refrigeration system according to the present invention, Fig. 4 is a schematic diagram of a conventional refrigeration system, and Fig. 6 is a schematic diagram of a conventional improved refrigeration system. Figures are shown respectively. 1... Compressor, 2... Condenser, 3...
...First throttle device, 4...Second throttle device, 6...Evaporator, 6...Fluid control valve, 7...・Valve device. 10...Pressure responsive element, 11.12...
・Room. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure 2 Figure 2? Figure 3 Pljz- 184 Figure 2 4 Figure 5\μ

Claims (2)

[Claims] (1) A pressure-responsive element divides the interior into two chambers, and a fluid control valve that opens and closes a valve device connected to the pressure-responsive element according to the displacement of the pressure-responsive element, a compressor, a condenser, and a chamber configured in series. 1. A second throttling device, an evaporator, etc. are connected in an annular manner, and one chamber inside the fluid control valve is communicated with the high-pressure circuit side pressure, and the first and second throttling devices are connected to the other chamber. , and a valve device of the fluid control valve is interposed between a condenser and an evaporator, and the refrigeration device is configured to close the valve device when the pressures in the two chambers are substantially equalized. (2) The refrigeration system according to claim 1, wherein the flow path resistance of the first throttle device on the upstream side is greater than that of the second throttle device on the downstream side.