JPS5993161A - 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 the Invention The present invention relates to a refrigeration system used in near conditioners and the like.

Configuration of conventional example and its problems In conventional refrigeration equipment of this type, d, ON-OF of compressor
A method of cooling to a predetermined temperature through F operation is used. In this 0N-OFF operation, after startup, low efficiency operation occurs due to unsteady operation until the pressure inside the refrigeration equipment and the refrigerant distribution state reach a steady operating state, so about 80% of the refrigeration capacity during continuous operation occurs. Only the cooling capacity is demonstrated.

As an improvement to this problem, a compressor 10 as shown in FIG.
1. Pressure three-way valve 102. Condenser 103. Pressure three-way valve 10
4. Pressure reducer 106. The evaporators 106° are sequentially connected in an annular manner, and the bypass pipe 107 of the pressure three-way valve 102 is connected to the compressor 1.
o1 and the evaporator 106, the pressure three-way valve 102
When the pressure at the inlet section 108 exceeds a predetermined pressure, the main circuit from the inlet section 108 to the outlet section 109 is opened, and the bypass section 110 is closed. Conversely, when the pressure at the inlet 108 becomes less than a predetermined value, the circuit from the inlet 108 to the bypass section 110 is opened and the outlet 109 is closed. Also,
Some of the pressure crab valves 104 open the circuit when the pressure of the inlet pipe 111 exceeds a predetermined pressure, and close the circuit when the pressure reaches a predetermined predetermined pressure. As shown in FIG. 4, the pressure change caused by this refrigeration equipment is caused by
The pressure Pd at the inlet portion 108 of No. 2 is higher than the predetermined value Pdo,
The pressure PC of the inlet pipe 111 of the pressure crab valve 104 is also higher than the predetermined value PCO. Therefore, the refrigerant is compressor 101 - pressure three-way valve inlet 108 - recirculation [1 part 1 OCa - condenser 1
03-Pressure crab valve 104-Pressure reducer 105-Evaporator 106
- The air flows to the compressor 101, and the binoculars pipe 107 is closed, forming a steady cooling circuit. Then, when the cooling operation is stopped, the pressure on the high pressure side decreases, and first, the pressure on the crab side valve enters 1:1 in the tank 111 pressure P. is the predetermined value P. . The pressure becomes lower and the circuit of the pressure crab valve 104 is closed. Next, the pressure Pd of the pressure three-way Japanese 11 section 108 falls below the predetermined value Pd0, the main circuit of the pressure three-way valve 102 is closed, and the 74747 circuit 107 is opened. Therefore, the pressure inside the condenser 103 is approximately the predetermined value P. . is maintained, the pressure inside the compressor 101 is balanced with the pressure P8 of the evaporator 106, and the pressure inside the compressor 101 is balanced with the pressure P8 of the evaporator 106.
All the refrigerant inside flows into the evaporator 106. At the time of restart, first, the compressor 101 is operated to suck the refrigerant remaining in the evaporator 106, and the pressure inside the compressor 101 increases. As a result, the pressure Pd at the pressure three-way valve inlet 108 also gradually increases, and when it becomes higher than a predetermined value Pdo, the pressure three-way valve 108
2 is opened and the bypass circuit 107 is connected, high-pressure refrigerant flows into the condenser 103, and the pressure PC of the pressure crab inlet pipe 111 gradually rises and becomes higher than the predetermined value Po0. Open the circuit and enter cooling operation mode. At this time, the refrigerant in the condenser 103 is maintained at a slightly lower level than during operation, and the steady cooling operation state is reached relatively quickly after the pressure three-way valve 104 is circuited. In this refrigeration system, after startup, the only unsteady operation is until the inside of the compressor 101 becomes constant (approximately 1 minute) and when the inside of the condenser 103 becomes steady (approximately 0.5 minutes). Since it is K compared to about 6 minutes in the conventional case, it is certain that the heat exchanger can perform at 95%'i of its capacity.

However, even with this refrigeration system, the possible energy saving rate is 2.
It is only 16% effective out of 0%, and has the drawback of being ineffective despite the use of expensive valves.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a refrigeration system that achieves an efficiency of approximately 10Q% by reducing unsteady operation after startup to almost zero using a valve device that operates accurately and instantaneously due to temperature changes caused by the start and stop of the compressor. The aim is to provide the equipment.

Structure of the Invention In order to achieve the above object, the present invention opens and closes a valve based on the pressure difference between the pressure corresponding to the suction pipe temperature of the compressor and the condensing pressure, and opens and closes the valve when the condensing pressure is higher than the pressure equivalent to the suction pipe temperature by a predetermined value or more. By providing a differential pressure valve that opens between the condenser and the pressure reducer, the valve opening and closing operations can be made faster.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a compressor, 2 is a condenser, 3 is a differential pressure valve, 4 is a pressure reducer, and 5 is an evaporator. The compressor 1 is a rotary type, and the internal machine room 6 does not have a satanyong valve. Therefore, a check valve 7 is interposed between the evaporator 6 and the compressor 1, and the evaporator 6 and the compressor 1 are sequentially connected in an annular manner. configuring the device. The differential pressure valve 3 includes an upper casing 10 having a pressure guiding pipe 9 having a heat-sensitive cylinder 8 at its tip, and an inlet pipe 11. A lower casing 13 having an outlet pipe 12 forms an outer shell 14, a pressure responsive element 16vC is formed inside, and a pressure sensitive chamber 16 is formed above. The lower part is divided into a valve chamber 17.

The pressure sensitive chamber 16 is filled with the same condensed gas as the refrigerant in the refrigeration system, and the valve chamber 17 is filled with one tube 11 for one person and one tube 12 for one person.
It is equipped with a valve device 18 that opens and closes a circuit with. Valve device 1
8 consists of a valve seat 2o formed at the center of the upper surface of the block 19 and a ball valve 22 housed in a holder 21. A spring 23 is provided in a compressed state between the lower casing ring 13 and the outer periphery of the holder 21. Spacer 2 due to the biasing force of spring 23
4, the holder 21 is pressed against the center of the lower surface of the pressure responsive element 16. Therefore, the ball valve 22 moves up and down in conjunction with the displacement of the pressure responsive element 15 to open and close the valve device 18. The outer periphery of the block 19 and the lower casing 13 are screwed together with an adjustment screw 25 to adjust the differential pressure between the pressure sensitive chamber 16 and the valve chamber 17, which determines the opening and closing of the valve device 18.
The adjusting screw 25 is closed air-tight by tightening it.

In this embodiment, the opening/closing differential pressure of the valve device 18 is OKp/
Adjust it so that it is cdl.

Further, the heat-sensitive cylinder 8 is attached to a part of the suction pipe 26 between the compressor 1 and the check valve 7 for heat exchange. In other words, the differential pressure valve 3
A pressure corresponding to the temperature Tll of the suction pipe 26 between the check valve 7 and the compressor 1 acts inside the pressure sensitive chamber 16,
Inside is condensation temperature T. A pressure corresponding to is acting on the valve device 18, and when this differential pressure reaches a predetermined value (OKp/crA), the valve device 18 is opened and closed. In other words, the temperature T of the suction pipe 26
, >condensation temperature T. At this time, the valve device 18 of the differential pressure valve 3 is opened, and when the suction pipe temperature T8≦condensation temperature Tc, the valve device 18 is configured to be closed for the rest of the day.

The operation of the above configuration will be explained based on temperature. During operation of the compressor 1, the high temperature, high pressure gas compressed by the compressor 1 is condensed in the condenser 2, and its temperature T0 is usually about 5 to 1 Qdeg higher than the ambient temperature.

On the other hand, gas that has undergone heat exchange in the evaporator 6 and has been superheated to the evaporation temperature is flowing through the suction pipe 26 of the compressor 1, but the temperature T8 is 5 to 10 degrees lower than the ambient temperature and some As shown in FIG. 2, since Tc>Tg, the valve device 18 of the differential pressure valve 3 is opened. Next, when the compressor 1 stops, the condensation temperature T0 decreases due to heat radiation from the condenser 2, but at this time too, the high pressure side pressure is condensed @ degrees T. It is a pressure horn corresponding to . At the same time, the oil film seal in the machine room 6 of the compressor 1 is broken, and the high-temperature refrigerant in the compressor 1 flows backward through the machine room 6 and into the suction pipe 26 . At this time, the check valve 7 is closed due to the stoppage of the refrigerant flow, and as shown in FIG. 2, the suction pipe 26a gland Tll rapidly rises to the condensing temperature T. be higher than This is due to the inflow of high temperature gas in the compressor 1 whose temperature is much higher than the condensation temperature Tc.

Therefore, as soon as the compressor 1 stops, as shown in FIG. 2, the suction pipe temperature Ts>condensation 6'P degree T. Therefore, differential pressure valve 3
The valve device 18 is closed.

By closing the valve device 18, the refrigerant in the condenser 2 does not flow into the pressure reducer 4 and the evaporator 6, and the inside of the condenser 2 is maintained in the same state both during operation and during stoppage. The same applies to the compressor 1, and the high-pressure refrigerant in the compressor 1 during operation flows backwards from the machine room 6 through the suction pipe 26 to the check valve 7 while the compressor 1 is stopped, but the amount is very small, and the refrigerant in the compressor 1 is in almost the same state both during operation and when stopped. Therefore, when starting after stopping, sufficient refrigerant is quickly distributed on the high pressure side, so
Immediately enter steady operation condition, condenser 2. Approximately 10 evaporators (5 and 5)
It can exhibit 0% heat exchange capacity, making extremely highly efficient cooling operation possible.

Effects of the Invention As is clear from the above explanation, the present invention is capable of reducing the pressure difference between the pressure corresponding to the temperature of the heat-sensitive tube installed between the compressor and the check valve connected to the suction side of the compressor and the condenser pressure. A valve device is provided between the condenser and the pressure reducer, which opens and closes according to the displacement of the pressure-responsive element.
During operation, a normal refrigeration cycle is configured, and the valve device is closed almost at the same time as A7 is stopped, so the refrigerant in the condenser does not decrease during stoppage. During stoppage, 1. The refrigerant flowing back from the compressor is stopped by a check valve, and does not flow into the evaporator, maintaining the same state as during operation, and the compressor suction pipe and inside the compressor. are also balanced to the same pressure. Therefore, the compressor starts with the pressure balanced, so the starting performance is almost the same as before.
From the time of startup, the entire refrigeration system is in the same refrigerant state as during operation, and a steady state of operation is achieved immediately, an increase of about 20% compared to conventional systems.

This allows for high efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a refrigeration system according to an embodiment of the present invention, Fig. 2 is a temperature change diagram of main parts of the refrigeration system shown in Fig. 1, Fig. 3 is a schematic diagram of a conventional improved refrigeration system, and Fig. 4 is a schematic diagram of a conventional improved refrigeration system. The figure is a pressure change characteristic diagram in the apparatus of FIG. 3. 1... Compressor, 2... Condenser, 3...
...Differential pressure valve, 4...Reducer, 5...
Evaporator, 7...Check valve, 8.°°...Thermosensitive tube, 11...Inlet l pipe, 12...Output [-
1 tube, 16... Pressure responsive element, 16...
-Pressure sensitive chamber, 17...valve chamber, 18...valve device. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 2 1 hour 3rd section Figure 4 - H child rMEj

Claims (1)

[Claims] A compressor, a condenser, a differential pressure valve, a pressure reducer, an evaporator, and a check valve are sequentially connected in an annular manner. The pressure-sensitive chamber is equipped with a heat-sensitive cylinder extending outside and is filled with condensable gas, while the valve chamber has an inlet pipe and an outlet pipe, and a pipe is provided between the two pipes. The valve device is provided with a valve device that opens and closes according to the response of the pressure responsive element, the heat sensitive tube is installed between the compressor and the check valve in a heat exchange state, and the valve chamber pressure in the differential pressure valve is A refrigeration system that opens the valve device when the pressure in the pressure chamber is higher than a predetermined value.