JP2716148B2 - Valve device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an improvement of a switching valve device which is suitable for maintaining a cooling or heating state such as a cooling / heating switching of an air conditioner or the like, and further relates to a valve. The present invention relates to a switching valve device so as to reduce an impact sound when the device is operated.

[Conventional technology]

In the prior art, for example, as shown in FIG. 4, a valve device usually uses an electromagnet as a drive source. Such an electromagnetic switching device is generally driven by an electromagnetic coil 40 for generating a magnetic field and the magnetic field. It comprises a movable body, that is, a plunger 41 and a spring 43 for returning the plunger 41 to its original position when the magnetic field disappears.

An example of the operation when the electromagnetic switching valve device having such a structure is used as a pilot valve of a four-way switching valve will be described with reference to FIG.

That is, FIG. 5 shows a structure in which the above-described electromagnetic switching valve device and the four-way switching valve device are integrated. In an initial state, in the pilot valve portion, the plunger 41 is shifted to the left and the valve portion 31 is shifted. Closed port 25 but port 23
And the low pressure side port 24 are electrically connected. Therefore, in the four-way switching valve 51, the pressure in the right valve chamber 52 becomes high, and the valve element 54 moves to the left end together with the partition walls 55 and 56, and connects the pipe 58 to the pipe 59.

A high-pressure fluid flows into the four-way switching valve from a pipe 61. The fluid is supplied to an opening valve provided in a part of the partition walls 55 and 56.
It is introduced into the left and right valve chambers 52 and 53 via 57.

Next, by energizing the coil, the plunger 41 is sucked against the spring 43 in the direction of the arrow.
28 closes port 23 and establishes conduction between port 25 and low pressure side port 24. Then, the high-pressure fluid in the valve chamber 52 on the right side of the four-way switching valve 51 flows out of the low-pressure side port 24 and becomes low pressure, while the port 23 is closed. Through the valve chamber 53 to form a high-pressure portion, the valve element 54 moves to the right end together with the partition walls 55 and 56 to conduct the pipe 60 and the pipe 59. The pipe 59 has a low pressure.

However, according to the related art, a large force equal to the combined force of at least the force for compressing the spring 43 and the force for moving the valves 31 and 28 needs to be applied to the plunger 41, and the operation is quick. When the plunger moves and the plunger is actuated to collide with the end cap 38, a considerably loud impact sound is generated because the plunger having a considerable speed collides with the end cap.

Also, in such a situation, mechanical damage to the plunger and the end cap requires severe replacement of the part in a short period of time, which not only reduces the working efficiency but also increases the production cost. Was.

Further, in the related art, since a solenoid valve is used, a large-sized device must be employed to generate a stroke and an operating force. In addition, the solenoid valve is always energized during operation. It was economically disadvantageous because of the need.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the above-mentioned disadvantages of the prior art, to make the operation of the valve slow during operation and to reduce the impact noise, thereby improving the function and life of the switching valve device, An object of the present invention is to provide a switching valve device capable of improving efficiency and reducing production cost.

[Means for solving the problem]

The present invention has the following technical structure as means for achieving the above object.

That is, a valve portion 4 provided in a valve chamber 2 inside the main body 1 and two operating shafts 5 having one ends abutting on both sides of the valve portion 4, respectively.
5 ', two slow-moving elements 6, 6' for driving each of the operating shafts 5, 5 'in only one direction, and two constant-temperature heating elements in contact with the slow-moving elements 6, 6' The valve device comprises a body 7, 7 ', and is configured such that one of the slow-acting elements is operated only while the valve portion 4 is operated.

Embodiment A preferred embodiment of the present invention will be described with reference to FIG. 1 as an embodiment.

In FIG. 1, a valve device 1 is provided with a valve portion 4 in a valve chamber 2 inside a main body 1 having a fluid inflow pipe 8 and a fluid outflow pipe 9, and a gentle operation element 6 on both sides of the main body. , 6 'are attached.

Further, the operation shafts 5, 5 'of the slow motion elements 6, 6' protrude into the valve chamber from both sides of the main body, and the tips thereof are in contact with the left and right end faces of the valve portion 4.

On the other hand, a constant temperature heating element 7,
7 'is joined.

The constant temperature heating element generates heat by an appropriate heating means to heat the slow operation element and displace the operation shaft.

As the slow-moving element used in the present invention, a wax-type thermoelement, so-called wax thermo, can be used. It is also possible to use a shape memory alloy as the slow operation element.

The constant-temperature heating element is not particularly limited, but may be any substance that can be set to a constant temperature by appropriate means, such as a heater.

In FIG. 1, the valve 3 connected to the outflow pipe 9
Is closed by the valve portion 4. When the temperature of the set temperature heating element 7 is increased by energizing the set temperature heating element 7 on the left side, when the slow operating element 6 made of wax thermo is heated, the operating shaft 5 of the slow operating element gradually extends to the right. The valve 3 is opened slowly by pushing the valve portion 4 back to the right.

At this time, the operating axis of the opposite slow motion element is gradually pushed into the right slow motion element 6 '.

Since the constant temperature heating element maintains a constant temperature, the operation axis of the slow motion element stops at a certain position. In this state, the valve 3 can be kept open even if the current supply to the constant temperature heating element is stopped. On the contrary, when the valve 3 is closed, the opposite operation is performed.

That is, in the present invention, each time the valve section is moved in any direction, any one of the constant temperature heating elements may be operated to displace the corresponding operation axis of the slow operation element. .

In the present invention, a stopper 10 may be provided on the valve to prevent excessive movement of the valve. Further, the valve chamber of the present invention has a structure as shown in FIG. It may be.

Further, in the present invention, in order to prevent excessive movement of the valve portion and protect the structure of the valve portion, the valve is urged by a groove provided in the main body as shown in FIG. 3 and a spring fitted therein. Lock mechanism 11 composed of spherical body or safety spring mechanism 1 to prevent breakage due to overload of wax thermo
2,12 'may be provided. FIG. 3 shows a valve according to the present invention directly applied to a four-way switching valve.

The valve device according to the present invention has a simple structure and is easy to handle, so that it can be used in a wide range of fields.

Therefore, even if it is used as the pilot valve of the four-way switching valve of FIG. 4 described above, it can sufficiently fulfill its function.

Further, in the present invention, since the valve is slowly operated by using the slow-acting element, not only the impact sound can be reduced, but also the slow-acting element is mounted on both sides of the valve, and each of the slow-acting elements is provided one by one. After the valve is energized and the valve is operated, the position of the valve can be maintained while the energization is stopped, so that the power consumption is small and the energy can be saved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing an example of the valve device according to the present invention. FIG. 2 is an enlarged sectional view showing another example of the valve device according to the present invention. FIG. 3 is an enlarged sectional view showing another example of the valve device according to the present invention. FIG. 4 is a sectional view showing a conventional example. FIG. 5 is a sectional view showing an example of a four-way switching valve device using a conventional solenoid valve device. 1 ... body, 2 ... valve chamber, 3 ... valve, 4 ... valve section, 5,5 '... operating shaft, 6,6' ... slow-moving element, 7,7 '... constant temperature heat generation Body, 8 ... Inflow pipe, 9 ... Outflow pipe, 11 ... Lock mechanism, 12 ... Safety spring, 40 ... Electromagnetic coil, 41 ... Plunger, 42 ... Valve, 43 ... Spring.

Claims (2)

(57) [Claims] 1. A valve provided in a valve chamber inside a main body, two operating shafts each having one end abutting on both sides of the valve, and each of the operating shafts being pressed and driven only in one direction. A valve comprising: a plurality of slow-moving elements; and two constant-temperature heating elements abutting on the slow-moving elements, wherein one of the slow-moving elements is operated only while the valve section is operated. apparatus. 2. The valve device according to claim 1, wherein a lock mechanism for positioning the valve portion is provided between the valve portion and the valve chamber wall portion.