JPS5829826Y2 - Refrigerant noise prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerant noise prevention device 1 for reducing the noise that is usually called evaporative noise that occurs in a cooling device during the initial operation of the cooling device.

Various points have been discussed as the cause of this evaporative noise, but the ones that are currently in practical use are methods of enlarging the diameter of the tip of the capillary tube in multiple stages in order to control the vibration of the capillary tube, and For example, attaching mass.

The present invention aims to eliminate this resulting vibration of the capillary tube.

That is, in a cooling device conventionally used in refrigerators and the like, as shown in FIG.
Circulate more refrigerant.

And capillary tube B and suction tube C
are in contact with each other, for example, by soldering, to maintain a heat exchange state at portion d.

In such a device, evaporative noise is often generated at the beginning of operation, and the suction tube temperature at that time becomes extremely low from the normal operating condition, as shown in FIG.

This is because the liquid refrigerant enters the evaporator a when the compressor is started, and the unevaporated refrigerant flows through the suction tube C in a state similar to a liquid bag.

The evaporative noise that occurs and disappears during the initial 30 to 120 seconds of operation is caused by the rapid cooling of the capillary tube B by the suction tube C, and normally the liquid refrigerant e and moisture are mixed together as shown in Figure 3. The cooling of the capillary tube b promotes partial condensation of the refrigerant flowing in a relatively orderly manner as shown in FIG.
Liquid refrigerant e' and wet refrigerant b' are connected to capillary tube b
It is presumed that this occurs because vaporization occurs alternately within the evaporator a and discontinuous vaporization occurs at the portion where it flows into the evaporator a.

The present invention prevents overcooling by heating the capillary tube that causes overcooling with an electric heater, thereby preventing evaporative noise.Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.

1 is a capacitor-activated compressor, and 2 is a thermostat that controls the compressor 1.

3 is a starting relay, which has a relay coil 4 connected in series to the main winding of the motor (not shown) of the compressor 1.
and a relay contact piece 5 connected in series with the auxiliary winding.

6 is a capacitor connected to the relay contact 5 and the power source 7 side.

8 is a heater connected in parallel with this capacitor 6,
A heat exchange section 10a between the capillary tube 9 and the suction pipe 10 of the cooling device is arranged in a portion close to the cooler 11 for heat exchange.

Further, 12 is a condenser, and 13 is an accumulator.

Next, the operation of the electric circuit of the above embodiment will be explained.

When thermostat 2 turns on, starting relay 3
The relay coil 4 is energized and the compressor 1 starts operating.

At this time, the relay contact piece 5 of the starting relay 3 is closed, and the capacitor 6 is energized to enable initial starting.

Furthermore, since the heater 8 is connected in parallel to the capacitor 6, it is energized at the same time and generates heat.

This heats the refrigerant in the capillary tube 9, prevents local supercooling, and eliminates partial condensation.

Next, when the compressor 1 completes its initial startup and enters normal operation, the contact piece 5 of the starting relay opens, and the power supply to the heater 8 is automatically stopped.

As is clear from the above explanation, in this invention, an electric heater is installed in a part of the heat exchange part of the capillary tube and the suction tube, and electricity is supplied to the heater in conjunction with the initial startup of the compressor. This prevents partial condensation within the capillary tube at the initial stage of compressor startup, thereby preventing the generation of noise caused by the refrigerant, so-called Eva noise.

Furthermore, if a heater is connected in parallel with a capacitor for starting the compressor, the energization of the heater can be synchronized with the initial starting of the compressor very simply and easily.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the main parts of a conventional cooling system, Figure 2 is a characteristic diagram showing changes in suction pipe temperature during compressor operation, and Figures 3 and 4 show the flow of refrigerant in the capillary tube. A sectional view, FIG. 5 is an electrical wiring diagram showing an embodiment of the present invention, and FIG. 6 is a schematic diagram of the main parts of the refrigerant system. 1... Compressor, 3... Starting relay, 8... Beater, 9...
Capillary tube, 12... Condenser.

Claims (1)

[Scope of claim for utility model registration] ■ A compressor equipped with a starting relay, a condenser, a capillary tube, a cooler, a suction pipe, etc. are connected in a ring, and the capillary tube and suction pipe are arranged in a heat exchange relationship. In things,
A refrigerant noise prevention device, wherein a heater that generates heat in conjunction with the initial startup of the compressor is disposed in at least one of the capillary tube and the suction pipe in a heat exchange manner. (2) The refrigerant noise prevention device according to claim 1, wherein the heater is connected to the auxiliary winding of the compressor via the starting relay.