JPH04184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system using a rotary compressor, and is intended to save energy.

Rotary compressors are widely used in room air conditioners in Japan because they are highly efficient and compact. On the other hand, for small compressors such as household refrigerators, reciprocating compressors have traditionally been more efficient in terms of processing accuracy, but with recent improvements in processing and design technology, rotary compressors have become more efficient in the field of small compressors. has become highly efficient. However, although a calorimeter test using a rotary compressor alone shows that the efficiency is approximately 20% higher than that of a reciprocating type, when it is actually installed in a household refrigerator, the consumption of JIS C 9607 electric refrigerators and electric refrigerators is The effect measured in the power consumption test was halved, to a reduction of about 10% in power consumption at most. According to research conducted by the present inventor, the cause of this is that when the rotary compressor is stopped, an excessive amount of sparheat gas that remains in the closed container flows into the evaporator, heats the evaporator, and becomes a heat load on the refrigerator. It's for a reason. The flow has two paths: the first path is where the superheat gas flows into the cylinder chamber through the mechanical seal of the compression element, and flows into the evaporator via the suction line, and the second path is from the airtight container. In this circuit, the gas flows to the condenser, where it radiates heat, becomes room-temperature superheated gas, and flows into the evaporator via the capillary tube. The superheat gas has a large influence on the first circuit, which is highly overheated. A common approach to this improvement is to use a check valve for the first circuit and a solenoid valve for the second circuit to respond to the shutdown of the compressor. This method has the disadvantages that the solenoid valve is expensive, consumes electric power, has a complicated electric circuit, and makes operating noise.

In view of the above drawbacks, the present invention seeks to provide an energy-saving refrigeration system that is inexpensive, does not require electrical control, is quiet, and can achieve higher efficiency than a single compressor. be.

An embodiment of the present invention will be described below. 1
The rotary compressor is composed of a closed container 2, a compression element 3, and an electric element (not shown). The refrigeration system includes a rotary compressor 1, a condenser 4, a high pressure circuit 5a of a fluid control valve 5 which is the main part of the present invention, a capillary reach tube 6, an evaporator 7, a low pressure circuit 5b of the fluid control valve 5, a suction line 8, and a compressor. 1 are sequentially connected in a ring.

The fluid control valve 5 includes a high pressure side casing 9 and a low pressure side casing 1 located below the high pressure side casing 9.
0 forms an outer shell 11. An outer shell 11 is provided between the high pressure side casing 9 and the low pressure side casing 10.
The inside is partitioned into a high-pressure circuit 5a on the high-pressure side casing 9 side and a low-pressure circuit 5b on the low-pressure side casing 10 side,
A diaphragm (pressure-responsive body) 12 is provided, the center of which moves up and down in accordance with the pressure difference between the pressure in the high-pressure circuit 5a and the pressure in the low-pressure circuit 5b. The high-pressure side casing 9 and the low-pressure side casing 10 have wide opposing surfaces so that they can easily exchange heat with each other via a diaphragm (pressure-responsive body) 12.
A retainer 13 is provided on the diaphragm (pressure responsive body) 12 to restrict excessive movement of the diaphragm (pressure responsive body) 12 and to prevent the diaphragm (pressure responsive body) 12 from being damaged. The retainer 13 is provided with a plurality of small holes 13a, 13b, . . . for correctly sensing the pressure of the low pressure circuit 5b. A high-pressure inlet side port pipe 9a is provided at a position offset from the center of the high-pressure side casing 9, which communicates the capacitor 4 with the high-voltage circuit 5a. A high-pressure side outlet pipe 9b extending upward is provided at the upper center of the high-pressure side casing 9 to communicate the capillary reach tube 6 and the high-pressure circuit 5a. A high-pressure side valve chamber 9c is provided in the center of the high-pressure side casing 9 and communicates with the high-pressure circuit 5a. A high pressure side valve seat 9d is provided above the high pressure side valve chamber 9c. High pressure side outlet pipe 9
b is provided in the high pressure side casing 9 so that the high pressure side valve seat 9d communicates with the high pressure side valve chamber 9c. The high-pressure side valve chamber 9c accommodates a ball valve (high-pressure valve) 14 so as to be movable up and down. The high pressure side valve seat 9d is configured to be closable by a ball valve (high pressure valve) 14 pushed upward. During operation of the refrigeration system, the diaphragm (pressure-responsive body) 12 is deformed due to the pressure difference between the pressure in the high-pressure circuit 5a and the pressure in the low-pressure circuit 5b, and the center portion of the diaphragm (pressure-responsive body) 12 and the high-pressure side valve seat 9d deform. By opening a gap, the pressure in the high pressure circuit 5a and the pressure in the low pressure circuit 5b are restored to substantially equal pressure, and the urging force of the diaphragm (pressure responsive body) 12 presses the ball valve (high pressure valve) 14 against the high pressure side valve seat 9d. It is set up like this. The high pressure side valve device 15 includes a high pressure side casing 9, a high pressure side valve chamber 9c, a high pressure side valve seat 9d, a diaphragm (pressure responsive body) 12, and a ball valve (high pressure valve) 14. A low-pressure side inlet pipe 10a extending downward is provided at the lower center of the low-pressure side casing 10 to connect the evaporator 7 and the low-pressure circuit 5b. Low pressure side casing 10
A low-pressure side outlet pipe 10b is provided at a position offset from the center of the rotary compressor 1 to connect the rotary compressor 1 and the low-pressure circuit 5b. A low pressure side valve chamber 1 communicating with the low pressure circuit 5b is provided in the center of the low pressure side casing 10.
0c is provided. A low pressure side valve seat 10d is provided at the lower part of the low pressure side valve chamber 10c. Low pressure side inlet pipe 1
0a is a portion of the low pressure side valve seat 10d and the low pressure side valve chamber 10
It is provided in the low pressure side casing 10 so as to communicate with c. The low pressure side valve chamber 10c is a ball valve (low pressure valve)
16 is housed so that it can be moved up and down. Low pressure side valve seat 1
0d is configured to be closable by a falling ball valve (low pressure valve) 16. The low pressure side valve device 17 includes a low pressure side casing 10, a low pressure side valve chamber 10c, a low pressure side valve seat 10d, and a diaphragm (pressure responsive body) 12.
and a ball valve (low pressure valve) 16.

Next, we will discuss the effect. Figure 1 shows a state diagram when the refrigeration system is in operation.The high pressure side of the refrigeration system is at normal high pressure, and the low pressure side is also at normal low pressure. The center portion of the body 12 is pressed downwardly against the retainer 13 due to the pressure difference. Since the ball valve (high pressure valve) 14 has fallen onto the retainer 13 due to its own weight, the ball valve (high pressure valve) 1
4 and the high pressure side valve seat 9d are apart, the high pressure side valve device 15 is in an open state. On the other hand, the low pressure side valve device 17
The ball valve (low pressure valve) 16 is blown up by the gas flow from the evaporator 7 and becomes a ball valve (low pressure valve).
16 and the low pressure side valve seat 10d are apart, so the low pressure side valve device 17 is in an open state. Therefore, the refrigerant gas discharged from the rotary compressor 1 is sent to the condenser 4, the high pressure circuit 5a of the fluid control valve 5, the capillary reach tube 6, the evaporator 7, and the fluid control valve 5.
The low pressure circuit 5b, the suction line 8, and the rotary compressor 1 flow without any trouble to perform the refrigeration action.

Next, the state when the refrigeration system is stopped will be explained with reference to FIG. 2. When the rotary compressor 1 stops, the gas flow from the evaporator 7 stops, so the ball valve (low pressure valve) 16 in the low pressure circuit 5b of the fluid control valve 5 falls under its own weight, and the low pressure side valve seat 1
0d, the low-pressure side valve device 17 closes to prevent superheated gas from flowing into the evaporator 7, and at the same time, the superheated gas in the closed container 2 flows into the cylinder chamber (not shown) of the compression element, and further into the suction into the low pressure circuit 5 of the fluid control valve 5
b, the pressure in the low pressure circuit 5b rises rapidly and becomes approximately equal to the pressure in the high pressure circuit 5b.
When the pressures in both circuits 5a and 5b become approximately equal, the restoring force of the diaphragm (pressure-responsive body) 12 moves the center of the diaphragm (pressure-responsive body) 12 upward, so that the high-pressure circuit 5a of the fluid control valve 5 The ball valve (high pressure valve) 14 is pressed against the high pressure side valve seat 9d, and the high pressure side valve device 15 is in a closed state to prevent superheated gas from flowing into the evaporator 7. As described above, when the rotary compressor 1 stops, the low-pressure side valve device 17 and the high-pressure side valve device 15 of the fluid control valve 5 are closed almost simultaneously to prevent superheat gas from flowing into the evaporator 7.

In addition, a diaphragm (pressure responsive body) 12 is arranged on the high pressure side casing 9 side, and a low pressure side casing 1
Since the retainer 13 is placed on the 0 side, the retainer 13 protects the diaphragm (pressure-responsive body) even if the low-pressure side valve device experiences low pressure or rapid pressure fluctuations when the refrigeration equipment is in operation or transitions from stop to operation. 12 is prevented from moving excessively toward the low pressure side valve device side, the diaphragm (pressure responsive body) 1
2 will not move too much and become impossible to restore, or deform and malfunction.

As described above, the refrigeration system of the present invention includes a rotary compressor, a condenser, a high-pressure side valve device of a fluid control valve, a pressure reducer, an evaporator, a low-pressure side valve device of a fluid control valve, and a suction line. are sequentially connected in an annular manner, and a pressure-responsive body is provided between the high-pressure side valve device and the low-pressure side valve device, which responds to the pressure difference between the pressure in the high-pressure side valve device and the pressure in the low-pressure side valve device. and disposing a high pressure valve in the high pressure side valve device such that it operates in response to the pressure responsive body and closes when the pressure in the high pressure side valve device and the pressure in the low pressure side valve device are substantially equal; Since the low-pressure side valve device is a check valve, normal refrigerant circulation occurs when the refrigeration system is in operation, and when the refrigeration system is stopped, the low-pressure side valve device with a check valve function immediately closes, and the pressure in the low-pressure circuit increases rapidly. Since the high pressure side valve device is then closed, the superheated gas in the closed container and the condenser is prevented from flowing into the evaporator via the suction line, capillary reach tube, etc. Therefore, it saves about 25% of electricity compared to a device without a fluid control valve, and since both valve devices are integrally formed for heat exchange, the low temperature superheat gas, which is the waste heat from the evaporator, is used. By supercooling the liquid refrigerant flowing out of the condenser, the refrigeration effect can be improved, and power consumption can be further reduced by about 3%, making it possible to save about 28% in total. In addition, compared to those controlled by electromagnetic valves, they consume less power for control, do not require extra electrical wiring, and operate smoothly so they do not generate noise.

In addition, the pressure-responsive body is placed on the high-pressure side casing side and the retainer is placed on the low-pressure side casing side, so when the refrigeration equipment is in operation or transitions from stop to operation, the low-pressure side valve device is activated by low pressure or sudden changes. Even if pressure fluctuates, the retainer prevents the pressure-responsive body from moving excessively toward the low-pressure side valve device, so the pressure-responsive body moves too much and becomes impossible to restore, or deforms and malfunctions. Things will disappear.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a refrigeration system showing an embodiment of the present invention when it is in operation, and FIG. 2 is a circuit diagram of the refrigeration system when it is stopped. 1... Rotary compressor, 4... Condenser, 5... Fluid control valve, 6... Capillary reach tube (pressure reducer), 7... Evaporator, 8...
Suction line, 12...Diaphragm (pressure responsive body), 14...Ball valve (high pressure valve), 15...
High pressure side valve device, 17...low pressure side valve device.

Claims (1)

[Claims] 1 rotary compressor, capacitor,
A high-pressure side valve device of a fluid control valve, a pressure reducer, an evaporator, a low-pressure side valve device of a fluid control valve, and a suction line are sequentially connected in an annular manner, and the outer shell of the high-pressure side valve device The internal pressure of the low pressure side valve device, the pressure inside the low pressure side valve device, and the pressure of the low pressure side valve device are between the high pressure side casing forming the outer shell of the low pressure side valve device and the low pressure side casing forming the outer shell of the low pressure side valve device. A pressure-responsive body that responds to a pressure difference and a retainer that restricts excessive movement of this pressure-responsive body are provided, and this retainer is located on the low-pressure side casing side to transmit the pressure on the low-pressure side through the pressure-responsive body. and a high pressure valve is arranged in the high pressure side valve device such that it operates in response to the pressure responsive body and closes when the pressure in the high pressure side valve device and the pressure in the low pressure side valve device are substantially equal pressures. A refrigeration system characterized in that the low pressure side valve device is a check valve.