JPS60165469A - 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] Industrial applications The present invention relates to improvements in small-sized refrigeration devices such as refrigerators.

Conventional configuration and its problems As this type of refrigeration system, there is a refrigeration system shown in FIG.

1 is a compressor, 2 is a condenser, 3 is a capillary tube, 4 is an evaporator, and 5 is a suction line, which are successively connected in a ring shape. When this kind of refrigeration equipment starts cooling from a stable state at room temperature, the pressure changes as shown in Figure 2. Because it is dissolved in the refrigerant oil, it causes extreme refrigerant shortage during operation.

Therefore, the downstream pressure of the capillary tube 3 (hereinafter referred to as low pressure JJE force) Pg is 0, 1-0, 2Ky/cd.
It becomes abs. Next, as the compressor 1 continues to operate, the temperature of the refrigerating machine oil 6 rises, and the dissolved refrigerant gradually separates and separates, increasing the amount of refrigerant circulating within the refrigeration system.
The low pressure Ps also increases (Fig. 2B).

At this time, the gear pillar tube upstream pressure (hereinafter referred to as high pressure) Pd also increases, and the pressure ratio Pd/Ps is l
tlτ is constant. After that, the amount of refrigerant dissolved in the refrigerating machine oil 6 reaches a constant value of 11 as the temperature rises and the low pressure P8 reaches the stop 1.C) The low pressure Ps reaches its maximum value.
Ma! It gradually decreases from In addition, the change in current value from the time of activation is shown in Figure 3, and the inrush current 1 at the instant of activation
The values other than 0 show the same tendency as the change in the low pressure P8, and the maximum current iuni flows when the low pressure Ps reaches its maximum value of 2848. In a refrigeration system, even if the compressor 1 is the same, the condenser 2. Capillary tube 3. Evaporator 4
etc. have slightly different specifications, and the maximum value of the low pressure Ps differs greatly due to differences in cooling load, so the maximum current 'ma' also differs.As is well known, the compressor 1 has an overload capacity. A current protection device is required, and in the configuration of the refrigeration system, the specifications of the compressor 1, capacitor 2, and evaporator 4 can be easily determined by calculating the required cooling capacity, but the specifications of the compressor 1, capacitor 2, and evaporator 4 can be easily determined, but the selection of the capillary tube 3 and the compressor nosa 1 It is very difficult to select an operating capacitor and an overcurrent protection device, and in actual use, an unexpected rise in the low pressure Ps may occur, resulting in problems such as poor cooling.

Purpose of the Invention In view of this problem, the refrigeration system according to the present invention reduces the low pressure by reducing the amount of refrigerant circulation using a valve device when the low pressure rises above the allowable pressure of the compressor, and operates at always below the allowable pressure of the compressor. control to
The purpose of this design is to facilitate the selection of capillary tubes for refrigeration equipment, to enable the compressor operation capacitor to be applied to all refrigeration equipment with the optimum capacity, and to achieve maximum efficiency during normal operation. There is.

Structure of the Invention - In order to achieve the object described in F, the refrigeration system according to the present invention has a refrigerant control valve constituted by a pressure sensing part and a valve device, and causes low pressure and atmospheric pressure to act on the pressure sensing part, and lowers the low pressure. The valve device is closed when the pressure is higher than atmospheric pressure by a predetermined value, and the valve device is interposed between the condenser and the evaporator.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, 11 is a compressor, 12 is a condenser, 13 is a refrigerant control valve, 14 is a capillary tube, 16
is an evaporator, and 16 is a suction line. The refrigerant control valve 13 is composed of a pressure sensitive part 17 and a valve device 18,
They are connected by a piston 20 which is kept substantially airtight by a ring 19.

The pressure sensitive section 17 is connected to the upper casing 21. Lower casing 22
．． Pressure responsive element 23. Adjustment screw 24. bias spring 26
It is composed of etc. The outer periphery of the pressure responsive element 23 is welded to the upper casing 21 and the lower casing 22. Further, the bias spring 26 is interposed between the pressure responsive element 23 and the upper casing 21, and has one end attached to the adjustment screw 24.
The other end is placed 1h above the pressure responsive element 23 via the spacer 26.
Each is in contact with j. 27 is a housing;
Valve seat 28 and boat 29 at the bottom center. Top surface 30 at the top center
A cylinder 31 that communicates with the valve seat 28 is formed, and the upper surface 3
The outer periphery of the lower casing 22 is hermetically welded to the lower central portion of the lower casing 22 by soldering. A side exit hole 32 is formed at the bottom of the cylinder 31, and an exit vibrator 33 is formed in the exit hole 32.
Each port 29 is provided with an inlet vibrator 34 . A valve body 35 is attached to the lower end of the piston 20. There is a deposit 3 at the top
6, an O-ring 19 is provided in a concave groove formed substantially in the center shaft, and the upper and lower sides of the piston 2o are kept substantially airtight by the inner wall of the cylinder 31.

In addition, the lower part of the piston 20 is formed with a narrow diameter, and the cylinder 3
A gap is provided between 1 and 1. A biasing spring 37 is provided on the lower surface of the valve body 36, and biased in the valve closing direction by a fixed plate 38. The housing 27 is further formed with a pressure sensitive hole 39 communicating from the side surface to the soil surface 3o, and is provided with a pressure guiding pipe 40. That is, the valve body 36 opens and closes the valve device 18 in response to the pressure responsive element 23 in unison. Further, the pre-adjustment screw 24 and the bias spring 26 displace the pressure-responsive element 23 upward when the pressure in the impulse pipe 40 is higher than atmospheric pressure by a predetermined value or more.
The valve device 18 is closed by the biasing spring 37. Of course, when the valve device 18 closes, it is pressed against the valve seat 28 due to the pressure difference between the front and rear of the valve body 360. 28
In relation to the contact area with the valve, the pressure difference between the inlet vibrator 34 and the outlet vibrator 33 is approximately 10 KV/c when the valve is closed.
The pressure difference P2 (hereinafter referred to as valve closing pressure difference) between the pressure guide pipe 4o and the atmospheric pressure when the valve device 18 closes at point d, and the valve device 1
Pressure 1P1 between impulse pipe 4Q and atmospheric pressure when valve 8 opens
(hereinafter referred to as valve opening pressure difference) is set so that the valve opening pressure difference P is approximately 0.2 kg/cd lower than the valve closing pressure difference P2. In addition, in this embodiment, the adjustment screw 24
The valve closing pressure difference P2 is adjusted to be 2 Kr/bar. The above entry 1" vibrator 34 and capacitor 12
Connect the exit vibrator 33 to the exit tube 130.
At the inlets, impulse lines 40 are connected to the suction lines 16, respectively. It should be noted that the compressor 11 of the present refrigeration system has a condenser that can operate at maximum efficiency only when the low pressure Ps is up to 2.2 Kv/cdabs, and if the compressor 11 exceeds that level, so-called overload operation will occur, leading to burnout of the motor. Therefore, in order to operate at low pressures 2 and 5 up to about 910 Ilabs, the operating capacitor must be changed, and normally, low efficiency operation is forced.

Next, the operation of the above configuration will be explained.

When starting from a stable room temperature state, as shown in Figure 6, the initial stage (Figure 6 D) of refrigerant shortage and the period of increased refrigerant circulation N (Figure 6 E) are compared to the conventional example (Figure 2 A, B). ) is exactly the same as However, the low pressure reaches its peak (6th
Figure F) In the period, the low pressure P8 becomes 2.0 μmab
When the pressure rises to s, the pressure in the impulse tube 4° overcomes the biasing force of the bias spring 26, displacing the pressure responsive element 23 in both directions, and closing the valve device 18, so that the capillary tube 14
Stop refrigerant circulation to. However, cooling operation is performed in the evaporator 16 although there is a shortage of refrigerant. Therefore,
The low pressure Pg begins to drop. Low pressure P8 is 1,
81 (f/abs), the biasing force of the bias spring 26 overcomes the pressure of the impulse pipe 4o, displacing the pressure responsive element 23 in the 1 direction, and opening the valve device 18. At this time, the capacitor 12 and the inlet vibrator Since sufficient liquid refrigerant remains in the evaporator 34, normal cooling operation is performed in the evaporator 16 when the valve is opened, and the low pressure P8 also rises.

However, since the cooling operation continues, the low pressure Ps
The rate of increase will gradually slow down. By opening and closing the valve device 18 of the refrigerant control valve 13, the low pressure Ps gradually decreases, and the low pressure Ps no longer rises to 2.0 μdabs, and shifts to a stable state (Fig. 6G). To go.

If the above-mentioned refrigeration system is used as another cooling system, it will be amazing, but the speed of rise of low pressure P8 and the peak value of low pressure Ps will be different, but the low pressure Ps will be 2.0Kg/di.
Problems such as the current rising above a b s and causing the overcurrent protection device to operate and stopping the cooling operation or causing burnout of the motor do not occur, and can be easily repurposed.

Effects of the Invention As is clear from the above explanation, the refrigeration system according to the present invention closes the valve device interposed between the condenser and the evaporator when the low pressure is higher than the atmospheric pressure by a predetermined value. Since the compressor is never operated above the RP value and the normal operation RP allows the compressor to operate at the highest efficiency, it can be easily applied to any cooling device.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional refrigeration system, Fig. 2 is a pressure change diagram of the refrigeration system shown in Fig. 1, Fig. 3 is a current change diagram of the refrigeration system shown in Fig. 1, and Fig. 4 is a refrigeration system according to an embodiment of the present invention. A system diagram and a cross-sectional view of the main parts of the device, and FIG. 6 shows a low-pressure pressure change diagram of the refrigeration device shown in FIG. 4, respectively. 11...Compressor, 12...Condenser, 13...Refrigerant control valve, 14...
・Capillary tube, 16... Evaporator, 18... Pressure sensitive part, 19... Valve device,
23...Pressure responsive element. Name of agent: Patent attorney Toshio Nakao and 1 other person O Figure 2 Chiang Jia - Figure 3 Q Jia □ Figure 4 5

Claims (1)

[Claims] It is composed of a compressor, a condenser, a cavity evaporator, a refrigerant control valve, etc., and the refrigerant control valve is composed of a pressure sensing part and a valve device, and the pressure sensing part is arranged on one side of the pressure responsive element on the downstream side of the gear pillar tube. applying pressure, applying atmospheric pressure to the other surface, driving the valve device according to the displacement of the pressure responsive element, and interposing the valve device between the capacitor and the evaporator;
A refrigeration system that closes the valve device when the downstream pressure of the capillary tube is higher than atmospheric pressure by a predetermined value or more.