JPS59112163A - 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 Field of Industrial Application The present invention relates to refrigeration equipment such as freezers and refrigerators that cool multiple chambers to a predetermined temperature using a plurality of evaporators. Related to flow control.

Structure of the conventional example and its problems Conventional refrigeration equipment, for example, the refrigeration equipment of a two-temperature refrigerator-freezer (as shown in Fig. Valve 4. Second pressure reducer 5, first evaporator 6. Second evaporator 7. Suction line 8. Compressor 1
, and the first pressure reducer 3 and the inlet of the second evaporator 7 are connected via the second solenoid valve 9 and the third pressure reducer 1°. This constitutes a refrigeration system.

As shown in FIG. 2, the first solenoid valve 4 is connected to the normally closed terminal 112L of the temperature controller 11 of the cooling room (refrigerating room) having the first evaporator 6, and the second solenoid valve is connected to the normally open terminal 11b. A solenoid valve 9 is connected, and a temperature regulator 12 of a cooling room (freezing room) having a second evaporator 7 is connected in series with the temperature regulator 11, the solenoid valves 4 and 9, and the compressor 1, respectively. ing. With the above configuration, the freezer compartment.

When cooling both refrigerator compartments, the first solenoid valve 4 is opened, the second solenoid valve 9 is closed, and the refrigerant is transferred to the compressor 1° condenser 2. First pressure reducer3. Second pressure reducer5. First evaporator6. Second evaporator7. It circulates to the compressor 1 and cools the freezer and refrigerator compartments. When the temperature of the refrigerator compartment drops to a predetermined temperature, the temperature controller 11 of the refrigerator compartment switches to the normally open contact 11b, the first solenoid valve 4 closes, and the second solenoid valve 9 opens, and the refrigerant is discharged. Compressor 1. Condenser 2. First pressure reducer3. Third pressure reducer 10. Second evaporator7. It circulates to the compressor 1 and cools only the freezer compartment. When the temperature of the freezer compartment drops to a predetermined temperature, the temperature controller 12 of the freezer compartment opens, stops the compressor 1, and closes the solenoid valves 4 and 9, so that the high-temperature, high-pressure refrigerant in the condenser 2 is Pressure reducer 5. Since the structure prevents the refrigerant from flowing into the evaporator 6゜7 through the third pressure reducer 1o, two solenoid valves are required to control the refrigerant, which increases costs and reduces the operation of the solenoid valves. This requires soundproofing against noise, and also has the problem of increased power consumption due to increased input to the solenoid valve.

Purpose of the Invention In view of the above problems, the present invention enables switching control of refrigerant flow equivalent to two solenoid valves without using a solenoid valve,
It is an object of the present invention to provide a refrigeration system that is noiseless and requires no electrical input, and further has a refrigerant flow control device that prevents the flow of high temperature refrigerant into the evaporator when the compressor is stopped.

Structure of the Invention In order to achieve this object, the present invention provides a differential pressure valve that operates based on changes in the internal pressure of the refrigeration system that are synchronized with the start and stop of the compressor, and a pressure difference between the pressure equivalent to the temperature of the heat-sensitive part and the internal pressure of the refrigeration system. The temperature type differential pressure valve is provided on the downstream side of the condenser, and the temperature type differential pressure valve is provided on the downstream side of the differential pressure valve, and the temperature type differential pressure valve is operated by the pressure change in synchronization with the operation and stop of the compressor. By opening and closing the differential pressure valve, when the compressor is stopped, high-temperature, high-pressure refrigerant is prevented from flowing into the evaporator from the condenser, and when the compressor is operating, the pressure equivalent to the temperature of the heat-sensitive part and the temperature inside the refrigeration system are The temperature type differential pressure valve is opened and closed to control the flow of refrigerant to the first evaporator when the differential pressure with respect to the first evaporator becomes larger or smaller than a predetermined value.

DESCRIPTION OF EMBODIMENTS Hereinafter, as an embodiment of the present invention, a two-temperature refrigerator-freezer 7 having two evaporators, particularly a refrigeration system having a rotary compressor, will be described with reference to FIGS. 3 to 5. The refrigeration system includes a high-pressure container-type rotary compressor 100. Condenser 101. First pressure reducer 102. Refrigerant control valve 103. Second pressure reducer 104. First evaporator 1Q5. Second evaporator 106. Check valve 108 that prevents backflow from suction line 10γ compressor 100
The third pressure reducer 109 is connected in an annular manner and bypasses the first evaporator 105. The inlet pipe 110 of the refrigerant control valve 103 is connected to the first pressure reducer 102
The first outlet pipe 111 is connected to the inlet of the second pressure reducer 104, and the second outlet pipe 112 is connected to the inlet of the third pressure reducer 109 to the second evaporator 106. Each is connected to the entrance.

Next, the configuration of the refrigerant control valve 103 will be explained. Inlet pipe 110. First outlet pipe 111, second outlet pipe 112
a casing 113 having a casing 113 and a pressure impulse pipe 114;
The thermosensitive cylinder 1 is connected to the upper casing 115 and the pressure guiding part 116.
17, and the lower casing 118 forms an outer shell 119, and the inside is divided into an upper pressure sensitive chamber 121, a valve chamber 122, and a lower pressure sensitive chamber 123 by an upper pressure responsive element 1201L and a lower pressure responsive element 120b. There is. The first ball valve 124+second ball valve 124+4126 are integrally attached to the side surfaces of the valve chamber 122 of the upper pressure responsive element 120& and the lower pressure responsive element 120b (through spacers 123iL and 123b, respectively). Both balls square 124.1'2
A block 126 is provided between the casing 11 between the inlet pipe 110 and the second outlet pipe 112.
It is integrally fixed in three parts. The block 126 includes a valve seat 127 of the first ball valve 124 and a valve seat 127 of the second ball valve 124.
25 valve seat 128 and the guide 129 of the first ball valve 124. The guides 130 of the second balls 9P125 are each formed integrally to constitute a first valve device 131 and a second valve device 132. Both guides 129 and 130 are provided with refrigerant passage holes 133 and 134, respectively. The block 126 also includes the valve seat 12 of the first valve device 131.
7 and a relatively large diameter through hole 135 that passes through the valve seat 128 of the second valve device 132, and a refrigerant communication hole 136 smaller than the passage area of the through hole 135 is formed approximately in the center of the through hole 135.
is provided, and a first outlet pipe 111 is connected to the outlet portion thereof. A spring 136 is provided in the upper pressure sensitive chamber 121, and the first ball valve 124 is urged against the valve seat 12 with a predetermined biasing force.
I'm pushing it to 7. The pressure impulse pipe 114 is connected to a suction line between the rotary compressor 100 and the check valve 108.

The lower pressure sensitive chamber 123 is filled with the same refrigerant as that of the refrigeration system. Heat-sensitive cylinder 11 communicating with lower pressure-sensitive chamber 123
7 is fixed to the first evaporator 1o5 for heat exchange. That is, a pressure corresponding to the temperature of the first evaporator 105 acts inside the lower pressure-sensitive chamber 123, and when the temperature of the first evaporator 105 falls below a predetermined value, the lower pressure of the lower pressure-sensitive chamber 123 responds. The circuit is configured to be closed by displacement of the element 120b. Also, rotary complete compressor 10
Control of the operation stoppage of 0 is performed by a temperature controller (not shown) of the freezing chamber including the second evaporator.

In the above configuration, when cooling the refrigerator compartment having the first evaporator 105 and the freezing compartment having the second evaporator 106, as shown in FIG.
0 is operated, and the high-pressure refrigerant (output from the condenser IQ1) is reduced in pressure to intermediate pressure in the first pressure reducer 102 and then flows into the casing 113 having the first valve device 131 through the inlet pipe 110. On the other hand, the suction line 107 of the compressor 1oo is at a low pressure due to the operation of the compressor 100. Therefore, the upper pressure sensitive chamber 1 connected between the compressor 100 and the check valve 108
21 is also at low pressure, and the upper pressure responsive element 1201
L is the pressure difference between the intermediate pressure in the casing 113 having the first valve device 131 and the low pressure in the upper pressure sensitive chamber 121, displacing the upper pressure responsive element 120a and the first ball valve 124 upward; The first valve device 131 is opened. Therefore, the refrigerant flows through the refrigerant passage hole 133. 'Through hole 135. Communication hole 13
6, the pressure is reduced to a desired low pressure in the second pressure reducer 104, the flow flows into the first evaporator 105, and the second evaporator 106
, suction line 107, and check valve 108. The air is circulated to the compressor 1oO to cool the freezer and refrigerator compartments.

゛ Then, when the temperature of the refrigerator compartment decreases to a predetermined temperature, that is, when the temperature of the first evaporator 105 decreases, the temperature of the heat-sensitive cylinder 117 decreases, and the pressure inside the lower pressure-sensitive chamber 123 also decreases.
The pressure is reduced to a temperature equivalent to 17.

Then, the pressure difference between the pressure inside the through hole 136 and the pressure inside the lower pressure sensitive chamber 123 increases due to the set pressure difference caused by the displacement of the lower pressure responsive element 120b, and the lower pressure responsive element 120b and the second ball valve 125 is displaced downward, opening the second valve device 132.

At this time, the passage area of the communication hole 136 is smaller than that of the through hole 135, and the second pressure reducer 1045 and the third pressure reducer 10
If the resistance of 9 is set small, the second valve device 13
2 opens, most of the refrigerant flows through the through hole 13 with low resistance.
5. Passing through the second outlet pipe 112, the pressure is reduced to a predetermined pressure by the third pressure reducer 109, and the second evaporator 106. Suction line 107, check valve 1o8. Rotary compressor 10
0, and cools only the freezer compartment having the second evaporator 106 with almost no refrigerant flowing into the first evaporator 105.

Next, when the temperature of the freezer compartment drops to a predetermined temperature, the compressor 100 is stopped by a temperature regulator (not shown).

When the compressor 10Q stops, the rotary set compressor 100
The oil seal in the inner cylinder chamber (not shown) is broken, and high-temperature, high-pressure refrigerant flows back into the suction line 107 from the cylinder chamber. However, due to the presence of the check valve 108, the high temperature and high pressure refrigerant is prevented from flowing into the evaporator 105 up to the check valve 108.
．． It will not become a heat load for IQ6. Also, compressor 100
The pressure in the Sathanyong line 107 between the check valve 108 and the
As soon as 00 stops, the pressure increases and Sakshi=! The pressure within the upper pressure sensitive chamber 121 connected to the online line 107 also rises. When the pressure difference between the inside and outside of the upper pressure responsive element 120a becomes less than the set value, the biasing force of the spring 136 displaces the upper pressure responsive element 120a downward and closes the first valve device 131 as shown in FIG. Then, the high-temperature, high-pressure refrigerant in the condenser 101 passes through the second pressure reducer 104 and the third pressure reducer 109 to the low-temperature evaporator 105.1.
06 and prevents it from becoming a heat load.

Therefore, this refrigerant control valve 103 controls the refrigerant inflow to the first evaporator 105 and the compressor 1 of the rotary set.
Preventing high-temperature and high-pressure refrigerant from flowing into the first evaporator 105 and the second evaporator 106 during the 00 stop,
The temperature of each evaporator 105 and 106 will not be increased and there will be no heat load.

In the illustrated embodiment, the first evaporator 105 and the second evaporator 106 are connected in series, but the invention is not limited to this. The first evaporator 105 is connected, and the second evaporator 106 is connected to the second outlet pipe 112 via a third pressure reducer 109, and the outlet sides of both evaporators 105 and 106 are connected to each other. It may also be connected to line 107. Although the heat-sensitive tube 117 is still placed in a heat exchange state with the first evaporator 1o5, it is also possible to operate at the indoor air temperature of the room (refrigeration room) where the first evaporator 105 is placed. .

Effects of the Invention As is clear from the above explanation, the present invention is composed of a high-pressure container type rotary set including a compressor, a condenser, a pressure reducer, a plurality of evaporators, and a refrigerant control valve. driving·
It has a built-in valve device No. 10 that opens and closes depending on the pressure change inside the refrigeration system that synchronizes with the stoppage, and a second valve device that opens and closes depending on the temperature change of one of the evaporators or the chamber cooled by this evaporator. A first valve device is arranged downstream of the condenser, and the outlet refrigerant passage of the first valve device is connected to a second pressure reducer having a large resistance connected to one evaporator and bypassing the upstream evaporator. It has a third pressure reducer with lower resistance connected to the other evaporator, and a second valve device is placed at the inlet of the bypass passage, so when the compressor is stopped, the The first valve device installed closes and prevents high-temperature, high-pressure refrigerant from flowing into the evaporator from the condenser through the pressure reducer, causing the evaporator to rise in temperature with the high-temperature, high-pressure refrigerant, creating a heat load. There is no. Also, when the temperature of the upstream evaporator is higher than a predetermined temperature during compressor operation, the second valve device is closed to allow refrigerant to flow into the upstream evaporator and downstream evaporator, and the pre-packed evaporator Allow to cool. When the temperature of the upstream evaporator drops below a predetermined temperature, the second valve device opens and most of the refrigerant flows to the second valve device and third pressure reducer, stopping cooling of the first evaporator. , without using two electromagnetic cells as in the past, 1
Two refrigerant control valves that do not require electrical input, prevent high-temperature refrigerant from flowing into the evaporator and creating a heat load when the compressor is stopped, and automatically control the refrigerant to the first evaporator while the compressor is running. Since it is carried out in a consistent manner, it is possible to obtain a low-noise and power-saving refrigeration system.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional refrigeration system, Fig. 2 is an electrical wiring diagram of a conventional refrigeration system, and Fig. 3 is a system diagram of a refrigeration system when the compressor is stopped, showing an embodiment of the present invention. FIG. 4 is a system diagram of the refrigeration system of the present invention when the compressor is in operation. 100...Rotary compressor, 101...
Condenser, 102...First pressure reducer, 11o...
...Inlet pipe, 111... -First outlet pipe, 112
...Second outlet pipe, 103... Refrigerant control valve, 104... Second pressure reducer, 105... First evaporator, 106... Second evaporator, 108...
・・Check valve, 109・・・Third pressure reducer, 131・
- First valve device, 132... second valve device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 21!4 2 Figure 3 or

Claims (1)

[Claims] The refrigerant control valve includes a compressor, a condenser, a pressure reducer, a plurality of evaporators, a bypass circuit that bypasses one of the evaporators, an inlet pipe, a first outlet pipe, and a second outlet pipe, and The control valve includes a first valve device that opens and closes depending on the pressure change in the refrigeration system that synchronizes with the operation and stop of the compressor, and a first valve device that opens and closes depending on the temperature change in the chamber cooled by the evaporator. The tenth valve device incorporating an operative second valve device is disposed downstream of the condenser, and the outlet refrigerant passage of the first valve device is connected to one of the evaporators. A third pressure reducer with low resistance is connected to the second pressure reducer and bypasses the one evaporator and connects to the other evaporator. Refrigeration equipment equipped with a valve device.