JPS60175889A - Valve device - Google Patents

Abstract

PURPOSE:To simplify structure and to improve response, by a method wherein the front and the rear of a gap between coil spring element wires of a shape memory alloy material covered with a covering film form a fluid inlet and a fluid outlet. CONSTITUTION:A coil spring 25 is formed by coil element wires 28 made of a shape memory alloy material, and the element wire 28 is coated with a coating film 29. The front of a gap between the coil element wires 28 forms a fluid inlet 32, and the rear thereof forms a fluid outlet 33. When an atmospheric temperature is relatively high, the gap between the coil element wires 28 is eliminated, and the covering film 29 improves sealing ability. When an atmospheric temperature is comparatively low, the fluid inlet 32 communicates with the fluid outlet 33.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a valve device whose flow path area changes depending on the temperature of a fluid.

Conventional Structure and its Problems Conventionally, a valve device constructed using a shape memory alloy as shown in FIG. 6 has been proposed. In this conventional device, when the coil spring 1 made of a shape memory alloy senses the temperature of the fluid and expands and contracts, it moves the injection nozzle 3 connected to it due to the force balance relationship with the bias spring 2. It changes the flow path area between the taper adjustment needle 4 and the injection nozzle 3. In this case, the coil spring 1 made of a shape memory alloy is used as a driving source for changing the flow path area of the valve device, and therefore the valve device requires a large number of parts. This had the disadvantage that the structure was complicated.

Purpose of the Invention The present invention has been made in view of the drawbacks of the conventional example, and
The object of the present invention is to obtain a valve device with a simple structure and low cost by using a coil spring made of a shape memory alloy as a valve body rather than as a driving source of the valve device.

Structure of the Invention In order to achieve the above object, the present invention provides a coil spring made of a shape memory alloy, a coating film covering the coil wire of this coil spring, and a fluid between the front and rear of the gap between the coil wires. It serves as an inlet and a fluid outlet.

With this configuration, a flow path is formed between adjacent strands of a coil spring made of a shape memory alloy, and the area of this flow path is automatically varied depending on the fluid temperature, and the coil spring is used as a valve body. By using this, a valve device with a simple structure and low cost can be provided.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 4 showing one embodiment thereof. In FIG. 1, 5 is a compressor, 6 is a four-way valve, 7 is a heat source side heat exchanger, 8 is a pressure reducer, and 9 is a user side heat exchanger, which are connected in sequence to form a refrigeration cycle. Also, 11° and 11 are the user side and heat source side heat exchangers 7, respectively.
, 9 and is driven by a common shaft 13 of an electric motor 12. Further, 14 is a slinger device integrated with the blower 11.

Next, in FIG. 2, reference numeral 16 denotes an outer box, and the inside is separated into an indoor side and an outdoor side by a partition plate 16. An indoor suction grill 17 and an indoor outlet grill 18 are provided on the indoor side, and an outdoor intake grill 19 and an outdoor outlet grill 20 are provided on the outdoor side.

21 is an air passage partition plate, and 22 is an indoor drain tray for the heat exchanger 9 on the user side. Reference numeral 23 denotes a drain pan for the heat source side heat exchanger T, and is provided with a discharge port 24, and this discharge port 24 is provided with a coil spring valve 25 made of a shape memory alloy. Further, 26 is a pipe that guides the drain water from the indoor drain pan 22 to the drain pan 23 by a drop. In addition, slinger 1
4 reaches near the bottom of the drain dish 23 so that the drain water 27 accumulated in the drain dish 23 can be sprinkled. Further, as shown in FIGS. 3 and 4, the coil spring 25 is made of a coil wire 28 made of a shape memory alloy, and this wire 28 is coated with a coach coating film 29. Further, one end of the coil is adhesively fixed to the recess 31 of the discharge port 24 using an adhesive 30.

In addition, the front part of the gap between the coil wires 28 is filled with fluid 32,
And, the rear part is used as a fluid outlet 33.

Next, the operation of the above configuration will be explained. First, when the compressor 6 and the electric motor 12 are operated during cooling, the user side heat exchanger 9
is an evaporator, and the heat source side heat exchanger 7 is a condenser. Therefore,
Indoor air sucked from the indoor intake grille 17 by the blower 10 is dehumidified and cooled by the user-side heat exchanger 9, and then blown into the room again through the indoor outlet grille 18 to cool the room.

At the same time, the drain water 27 condensed on the surface of the user-side heat exchanger 9 moves to the drain tray 23 through the indoor drain tray 22 and the sink 26. At this time, the coil spring valve 26 is
As shown in the figure, since the ambient temperature is relatively high, the coating film 29 contracts, and the gap between the coil wires 28 disappears.
improves sealing performance. The characteristics of the shape memory alloy coil spring valve 25 in this case will be explained with reference to FIG. In the figure, the horizontal axis shows the ambient temperature of the coil spring 25, and the vertical axis shows the spring length. When the temperature is low (during heating), it shows the length of gl, and as the temperature increases (during cooling), it becomes short to 12. Therefore, in the case of FIG. 3, the coil spring 21 is in a contracted state, and the fluid outlet 32 and the fluid outlet 3
3 is closed. The drain water 27 does not flow out from the outlet 24. Therefore, water is sprayed by the slinger device 14 onto the heat source side heat exchanger 7 acting as a condenser, thereby improving the heat dissipation ability. Also, at this time, if the amount of drain water flowing down from the pipe 26 is greater than the amount of water sprinkled by the slinger device 14, since the free end of the coil spring 26 is open, it will overflow from there and be discharged from the discharge port 24. In order to
There is no risk of overflowing the drain plate 23.

Next, during heating, the four-way valve 6 switches, and the user-side heat exchanger 9
is a condenser, and the heat source side heat exchanger 7 is an evaporator. Therefore, the indoor air drawn in from the indoor suction grill 17 by the blower 10 is heated by the user-side heat exchanger 9 and blown into the room again from the indoor blow-off grill 18, thereby heating the room.

At the same time, the drain water 27 condensed on the surface of the heat source side heat exchanger 7 falls into the drain tray 23. At this time, coil spring 2
As shown in FIG. 4, the number 6 extends to 11 because the ambient temperature is relatively low. Therefore, in the case of FIG. 3, the coil spring 25 is in a stretched state, and the fluid outlet 32 and the fluid outlet 33
are in communication with each other, and the drain water 27 is discharged from the gap between the coil wires 28 to the outlet, and the slinger device 14 does not sprinkle the drain water 27.

As described above, in this embodiment, during cooling, the drain port 24 is closed and the drain water 27 is transferred to the heat source side heat exchanger 7 which is a condenser.
The coil spring valve 26 operates simply by adjusting the ambient temperature, and the coil spring valve 26 operates simply by adjusting the ambient temperature, and the drain port 24 is opened during heating to discharge unnecessary drain water 27. No signals or drives are required. Further, a common drain tray 23 can be used for both cooling and heating. or,
Since the coil wire 28 of the coil spring 26 is coached with the coating film 29, the sealing performance is high. Also, coil spring 25
Since the fixed end of is provided in the concave portion 31 of the drain pan 23, even a small amount of drain water 27 easily flows down to the drain port 24, and there is no fear that unnecessary drain water 27 and dirt will accumulate in the drain pan 23. Furthermore, since the free end of the coil spring 26 is open, it also has the effect of serving as an overflow.

The material of the covering film 29 must be selected depending on the type of fluid and usage conditions, and may be rubber-based, plastic-based, etc.

Effects of the Invention As described above, according to the present invention, a coil spring made of a shape memory alloy, a coating film covering a coil wire of this coil spring, and a fluid inlet located before and after the gap between the coil wires. Since the valve body itself senses the fluid temperature and automatically changes the flow path area, it has good responsiveness, and it is also compatible with electrical signals and electrical signals. No driving source required. In addition, since the coating film is applied to the coil wire, the sealing performance as a valve is high. Furthermore, since the material is a shape memory alloy, it is possible to increase the adhesion force between the coil wires even when the valve is closed, and it is possible to obtain a high sealing force.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of a heat pump air conditioner to which the valve device of one embodiment of the present invention is applied; Fig. 2 is a sectional view of a wind type heat pump air conditioner to which the refrigeration cycle of Fig. 1 is applied; Figure 4 is an enlarged sectional view of the vicinity of the discharge port in Figure 2, Figure 5 is a characteristic diagram of the shape memory alloy of the coil material of the coil spring valve in Figure 2, and Figure 6 is a diagram of a conventional valve device. be. 25... Coil spring, 28... Coil wire, 29... Coating film, 32... Fluid inlet, 33... Fluid outlet. Figure 1 Figure 2 IQ Figure 5 Best performance

Claims (1)

[Claims] A valve device including a coil spring made of a shape memory alloy, a coating film covering a coil wire of the coil spring, and a fluid inlet and a fluid outlet at the front and rear of the gap between the coil wires.