JPS5954788A - Electrically-driven compressor - Google Patents

Abstract

PURPOSE:To allow cooling capacity and the like to be readily and rapidly raised to a stable value at start of operation, by providing a valve device at a discharge port of a compressor mechanism, and forming as the valve device a coil spring of reversible shape memory alloy wire. CONSTITUTION:A thermosensitive valve 33 is connected to a discharge port 32 of a discharge chamber cover 31 covering a discharge valve 30. The thermosensitive valve 33 is constituted of a coil spring 35 of reversible shape memory alloy wire which is rendered in closely wound condition at ordinary temperature, while in loosely wound condition upon heating, and it is closed at its one end by a metal plug 36, while being mounted at the other end to a frame 37 so as to open and close a discharge passage 38. When a compressor is halted for a long time, the coil spring 35 is rendered at ordinary temperature under closely wound condition, thereby closing the thermosensitive valve 33. When the compressor is started to operate, discharge pressure in a compressor meachanism 7 is increased until the coil spring 35 is rendered under loosely wound condition, and accodingly input of an electric motor 6 is enhanced, thereby accelerating a rising speed of temperature of the compressor.

Description

[Detailed description of the invention] Industrial application field failure [j! ] relates to a compressor for electric fijj for freezing and punching, which mainly has a 7111 type compression mechanism. .

Structure of a conventional example and its problems Figure 1 shows an example of a refrigeration circuit of a conventional air conditioner, which consists of a condenser 1, a condenser 2, a control device 3 for refrigerant flow, and an evaporator 4.
I'm here. The compressor 1 is a closed container, and an electric motor 6 is installed inside the container 5.
The refrigerant sucked from the suction port 8 is compressed by the compression mechanism 7 and then discharged into the airtight container 5. is,
It passes around the electric motor 6 and is guided from the discharge pipe 9 to the discharge connecting pipe 1o.

In a normal stable operating state, the refrigerant passing through the discharge pipe 9 is in a superheated state and has a higher temperature than the saturation temperature of the discharge pressure.

Then, the heat is radiated in the condenser 2, and after removing superheat, it is cooled through the saturated region to the super-refrigerant region, and the refrigerant flow rate restricting device 3
The water enters the evaporator 4, is evaporated, and returns to the compressor 1.

However, with conventional compressors, when the compressor is started after being stopped for a long time, the heat capacity of the part of the compressor that comes into contact with the discharged waste inside the compressor is quite large, and the temperature at this time is close to the ambient temperature. , Kano t-1, Su expands and liquefies at a low temperature for a while. , this will continue due to low discharge pressure, and if the discharge L1-force is low, the power consumption of the compressor will be low, the humidity increase rate of the compressor will be low, and (Lc condensing pressure, that is, the rate of increase in discharge pressure will be low). Become.

If the discharge pressure is low, the amount 14 (lf+f) of the refrigerant flowing through the fixed refrigerant flow rate restricting device 3 such as a capillary tube will be reduced, and the pressure on the suction side, that is, the suction pressure will be low.

If this suction pressure is low, the suction refrigerant becomes dilute C., and the refrigerant's concentration decreases, resulting in a further decrease in the compressor temperature rate W.

Conventionally, as shown in FIG. 1, in an attempt to improve the speed of -L increase in cooling capacity and heating capacity, the discharge connecting pipe 10 and the suction pipe were connected via the solenoid valve 11. It has been proposed that when the engine freezes, the solenoid valve 11 is opened at the beginning of startup to increase the pressure on the suction side, thereby increasing the discharge amount and the input to the electric motor.

As shown in Fig. 2, E's solenoid valve 11 is composed of parts that require expensive or highly sophisticated processing, such as a solenoid 14, a yoke 15, a blunter 16, and a valve body 17. Furthermore, in this case, the electric control circuit for keeping the solenoid valve 11 open for the required period of time also has the disadvantage of being expensive.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a device for rapidly increasing the cooling capacity or heating capacity of an air conditioner having a so-called high-pressure electric compressor at a stable value after the start of operation. The purpose is to construct the system at a low cost and with a fast delivery time.

Structure of the Invention In order to achieve this object, a VC present &, j:, El narrowed groove discharge III G-ζ valve device is provided, and this valve device is
Reversible) An A-coil spring formed by a shadow shape memory alloy wire and one end of this coil spring sealed!
.

The coil spring 11 is compressed (1-1-+L) of the coil spring, and the coil 11 is compressed.
．． When it is hot and humid, it is tightly wound and there is a tight space between each wire, and when it is hot, it is loosely wound.

Description of examples Hereinafter, one embodiment of the present invention will be described with reference to FIG. 3 of the accompanying drawings.

This will be explained with reference to FIG. Here, for the same parts as the conventional example, the same numbers are given as ML, and the explanation is omitted. and step up the discharge valve 3o.
A temperature-sensitive valve 33 is connected to the discharge port 32 of. The temperature-sensitive valve 33
is formed from a reversible shape memory alloy wire as shown in FIG. Q5 It consists of a slightly loosely wound coil spring 36, one end of which is closed with a sealing IF device 36, and the other end is connected to the valve stem 3 so as to open and close the discharge passage 38. This is what I finally installed.

In the above configuration, if the compressor is out of power for a long time, the coil spring 35 will reach room temperature and become tightly wound, so the temperature-sensitive valve 33 will be in the closed state.

When the compressor is started in this state, the discharge pressure of the compression mechanism 7 increases until the discharge pressure inside the compression mechanism 7 resists the close contact force of the coil spring 36 and brings it into a loosely wound state. As a result, the human power of the electric motor is high, and the temperature of the compressor increases at a high speed.

When the discharge temperature reaches a predetermined temperature, the coil spring 35 becomes loosely wound, and there is no pressure difference between the discharge pressure inside the compression mechanism and the pressure inside the closed container, resulting in a normal operating state.

Effects of the Invention As is clear from the above embodiments, the present invention has a temperature-sensitive valve with an extremely simple structure and does not require an electric control circuit, so it can be extremely inexpensive and shorten the time required to maintain stable cooling and heating performance. It is possible to do this.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a refrigerant system equipped with an electric and dynamic compressor showing a conventional example, and Fig. 2 is a cross-sectional view of a solenoid valve constituting the refrigerant line.
FIG. 3 is a schematic diagram of a refrigerant system equipped with an electric compressor according to an embodiment of the present invention, and FIG. 4 is a sectional view of a temperature-sensitive valve in the compressor. 1...Compressor, 5...Airtight container, 6.
...Electric motor, 7...Compression mechanism section, 9...
...Discharge pipe, 33IIIl/011 temperature-sensitive valve, 36-
11th race...kai coil fan, 36...''d fastener. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 1θ Figure 2”°17°

Claims (1)

[Claims] An electric motor and a compression mechanism are provided inside the airtight container, the discharge of the compression mechanism is opened inside the airtight container, and an inverted shape memory alloy wire rod is inserted into the airtight container. An electric compressor in which one end of a spring formed to be loosely wound when heated and tightly wound when at room temperature is closed, and the other open end is provided with a discharge port of the compression mechanism.