JPS5995346A - 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 a refrigeration system such as an air conditioner, and more particularly to a refrigerant control system for starting and stopping the refrigeration system.

Configuration of conventional example and its problems The refrigerant control device for starting and stopping conventional refrigeration equipment is 198
2 PURDUE COMPRESSORTECHNO
LOGY CONFERENCE NOANANARYS
IS OF A NEW TYPE REF
It was published in RIGERATION and is shown in Figure 1.

In Fig. 1, 1 is a compressor, current cut-off element 2. capacitor 3. On-off element 4. Capillary tube5. The evaporator 6 and the accumulator 7 are connected in a ring to form a refrigeration system. The current cutoff element 2 and the suction side of the compressor 1 are connected to a bypass circuit 8.
are connected. During the cooling operation, the bypass circuit 8 is closed and the refrigerant is transferred to the compressor 1. Current cutoff element 2. Capacitor 3. On-off element 4. capillary tube 6, evaporator 6, accumulator 7,
It flows again to the compressor 1 and performs normal cooling action. On the other hand, when stopped, the on-off element 4 is closed, and the current cut-off element 2 closes the capacitor 30 circuit and opens the bypass circuit 8 to balance the pressure between the high pressure side and the low pressure side of the compressor 1 and facilitate the next startup. do. The liquid refrigerant in the condenser 3 that has been cut off by the current cut-off element 2 and the on-off element 4 is maintained in the operating state until the next operation, so that cooling starts quickly during the next operation, resulting in energy savings. This is a reduction in so-called starting loss.

Although the configuration and effects of the conventional example have been described above, it has the following drawbacks. That is, when the operation is stopped, the high-pressure side and low-pressure side of the compressor 1 are bypassed to equalize the pressure, so the high-temperature and high-pressure gas that remains on the high-pressure side of the compressor 1 flows into the low-temperature evaporator 6, condenses and heats it, and generates heat. It becomes a load and hinders energy saving. As the use of rotary compressors (high-pressure container type) increases in recent years, the amount of high-temperature, high-pressure gas increases, which further impedes energy conservation. have. The small current cutoff element 2 closes the main circuit to the capacitor 3 and opens the bypass circuit 8 when the motor is stopped, so the structure is complicated and expensive.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to provide a refrigeration system which is further energy efficient, has a simple structure, and is inexpensive.

Structure of the Invention To achieve this object, the present invention provides a high-pressure valve on the upstream side of the evaporator of the refrigeration cycle that is open during operation of the refrigeration system and closed when the refrigeration system is stopped; In addition to providing a low-pressure valve that closes, a bypass valve that bypasses the high-pressure side and low-pressure side of the compressor when the compressor is stopped prevents high-temperature, high-pressure gas from the high-pressure side of the compressor from flowing into the evaporator, reducing the heat load. This aims to reduce startup loss due to increasing the pressure on the high pressure side of the compressor when restarting the compressor, and also makes startup easier by equalizing the pressures on the high pressure side and low pressure side of the compressor.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Second
4, 21 is a high-pressure vessel type rotary compressor (hereinafter referred to as rotary compressor), and a capacitor 22. High pressure valve 23 (hereinafter referred to as solenoid valve 23),
Pressure reducer 24 (hereinafter referred to as gear. Pirari tube 24),
Evaporator 26° Accumulator 26. Low pressure valve 27 (
A refrigeration cycle is constructed by connecting a check valve 27 (hereinafter referred to as check valve 27) and a compressor 21 in an annular manner. The composition of the compressor 21 is a so-called high-pressure container type rotary compressor, in which an electric element 29 and a compression element 3 are placed in a sealed container 28.
0 is directly connected and arranged and identified. A side passage 33 communicating with a high pressure space 32 within the sealed container 28 is provided in the suction passage 31 of the compression element 3o. The upper part of the side passage 33 is the valve seat 34
A substantially star-shaped valve 35 with a partially cut out outer periphery is placed on the upper part of the valve seat 34, and a ring-shaped valve stopper 36 is provided to restrict excessive movement of the valve 36. There is.

The valve 35 is placed upward (opening direction) at the lower part of the outer circumferential side of the valve 36.
A bypass valve 38 is configured by arranging springs 37 that bias the bypass valve 38.

This bypass valve 38 has a synchronous speed of 26~
The dimensions of the side passage 33 and the biasing force of the spring 37 are set so that the circuit is closed at a rotation speed of about 50% and opened at a rotation speed below that.

That is, the force F2 applied to the suction passage 31 side of the valve 35 and the force F2 applied to the suction passage 31 side of the valve 35
Force F1 that causes the sealed container 28 of No. 5 to break toward the high pressure space 32 side
However, as the compression element 3o is activated, it reaches 25 to 60% of its synchronous speed (for example, 3400 rpm), at which point Fl>F2 and the valve 35 is closed.

In the above configuration, when the refrigeration system is stopped, the bypass valve 38
is opened by the action of a spring 37.

In addition, the starting torque of the electric element 29 immediately after starting is 300 rprn (synchronous speed 340 rprn), which is called the pull amplifier torque.
When the torque is low (approximately 9% of 0 rpm) or less, the bypass valve 38 is still in an open state, so no compression action is performed, and the speed of the electric element 29 increases rapidly and the torque also increases rapidly. When the rotational speed of the electric element 29 reaches a predetermined speed (25 to 30% of the synchronous speed), the bypass valve 38 closes and starts compression, but the electric element 29 has sufficient torque to start up. The system will return to normal operation without causing any malfunction.

Therefore, the refrigerant discharged from the compressor 21 is transferred to the condenser 22. Solenoid valve 23. Capillary tube 24. Evaporator 25. It flows into the accumulator 26° check pulp 27, and is circulated again to the compressor 21 for normal cooling.

When the refrigeration equipment is stopped, the solenoid valve 23 closes and the contin f
22 (The flow of refrigerant from 1411 to the evaporator 26 is stopped. At the same time, the refrigerant gas in the high pressure space 32 flows back to the check pulp 27 via the suction path 31 through the small gap of the compression element 3o, so the check pulp 27 The circuit is closed.Moreover, as the refrigerant gas continues to flow into the suction passage 31, the pressure in the suction passage 31 rises and reaches approximately the pressure in the high pressure space 32, and the valve plate 36 leaves the valve seat 34 due to the biasing force of the spring 37 and bypasses the valve seat 34. The valve 38 is opened to prepare for the next start-up of the refrigeration system.

Therefore, when the refrigeration system is stopped, the solenoid valve 23 and the check pulp 27 are closed, so the high pressure side of the compressor 21 and the condenser 22 maintain almost the same refrigerant state even during the stoppage as during operation, so the next time the refrigeration system starts operating, it will be immediately after the start-up. Since the engine is fully cooled, the startup loss is significantly reduced. Since the evaporator 26 is still shut off by the check pulp 27 and the solenoid valve 23, there is no inflow of high temperature, high pressure refrigerant gas into the compressor 21, so there is no increase in heat load on the evaporator, and losses during stoppage are significantly reduced. Therefore, due to the above two effects, a greater energy saving can be achieved than in the conventional example. Further, since no compression is performed at startup due to the action of the bypass valve 38 provided in the compressor 21, a so-called PSC motor, which is an inexpensive low-startup torque type motor, can be used.

In addition, the parts added to the refrigeration system to save energy are general-purpose check pulp, general-purpose solenoid valves, bypass valves with simple structures, etc., so that the system is inexpensive.

Effects of the Invention As is clear from the above explanation, the present invention has a refrigeration system in which a compressor, a condenser, a capillary tube, and an evaporator are sequentially connected in a ring, and the circuit is opened on the upstream side of the evaporator when the refrigeration system is in operation and closed when it is stopped. A high-pressure valve is provided, and a low-pressure valve is provided downstream of the evaporator that opens and closes when the refrigeration system is in operation and closes when the refrigeration system is stopped. The circuit is closed when the rotation speed is above a predetermined number of rotations, and opened when the rotation speed is lower than that, so even when the refrigeration equipment is stopped, the condenser and evaporator maintain the operating pressure, so the normal cooling action starts immediately after the next startup. By doing so, it is possible to significantly reduce startup loss, and the compressor is stopped when the compressor is stopped.

High temperature and high pressure refrigerant gas in the condenser does not flow into the evaporator and condense and heat, resulting in large stoppage losses [1]
This can result in significant energy savings. In addition, when starting the compressor, the bypass valve works to start the compressor in a no-load state, so you can use an inexpensive motor such as a so-called PSC motor, which is a low starting torque motor. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of a conventional refrigeration system, FIG. 2 is a refrigeration cycle diagram of a refrigeration system showing an embodiment of the present invention, and FIG.
The figure is a sectional view of the main parts of the compressor in Figure 2, and Figure 4 is a sectional view of the main part of the compressor in Figure 2.
It is an enlarged cross-sectional view of part A in the figure. 21...High pressure vessel type rotary compressor,
22... Capacitor, 23... High pressure valve (electromagnetic valve), 27... Low pressure valve (check pulp), 38... Old bypass valve, 24... ...Pressure reducer (capillary tube), 26... Evaporator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4

Claims (1)

[Claims] A high-pressure container rotary compressor, a capacitor,
A pressure reducer, an evaporator, and a high-pressure valve and a low-pressure valve that are disposed on the upstream and downstream sides of the evaporator and are open during operation and closed during stoppage, and the interior of the high-pressure container type rotary compressor A refrigeration system in which a bypass valve is disposed between an external high-pressure side and a low-pressure side, and the bypass valve is closed when the high-pressure container type rotary congressor has a predetermined rotational speed or higher, and opens when the rotational speed is lower than the predetermined rotational speed.