JPS6210538Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a valve structure for a hot water heating system, and is particularly suitable for use in a hot water heating system for automobiles.

[Conventional technology]

This type of conventionally known flow control valve will be explained with reference to FIG. 1. Reference numeral 1 denotes a valve case, a hot water inflow side protrusion 1a for introducing engine cooling water from an automobile engine (not shown), and an automobile hot water system for introducing engine cooling water from an automobile engine (not shown). It has an outflow side protrusion 1b leading out to the heater core of the heating device. 2 is a valve operating shaft, and has a valve body 3 at one end thereof. A bracket 4 is fixed to the valve case 1. Further, sealing members such as a guide 5, a guide 6, an O-ring 7, an O-ring 8, etc. made of resin with excellent heat resistance such as polyacetal are provided between the valve operating shaft 2 and the valve case 1. This is designed to prevent fluid from leaking to the outside between the valve case 1 and the valve operating shaft 2.
9 is a plate for supporting these seal members.

The valve body 3 includes a plate 3a formed of brass, stainless steel, heat-resistant resin, etc., inserted into the narrow diameter portion 2a of the valve operating shaft 2, and a plate 3a formed of brass, stainless steel, heat-resistant resin, etc., and a plate 3a that is in close contact with the valve seat portion 1c of the valve case 1 when the valve is closed. A disc-shaped sealing member 3 made of heat-resistant rubber serves to close the flow path.
b, and a plug-shaped guide member 3c molded from a resin such as polyacetal that has a low swelling rate and excellent heat resistance, and a plate 10 is further incorporated in the lower end of the guide member 3c, and the whole is fixed to the valve operating shaft 2. has been done.

In the above configuration, the valve operating shaft 2 is operated in the axial direction (in the vertical direction in the figure) by a link mechanism (not shown), and the valve body 3 is also moved up and down accordingly to open and close the flow path, that is, adjust the hot water flow rate. Ru.

[Problem that the invention attempts to solve]

By the way, in this conventional structure, when bad water flows into the hot water circuit, that is, when hot water containing foreign substances such as iron powder and sand flows, the blade portion 3c-1 of the guide member 3c and the straight portion Since the gap between 3c-2 and the inner wall of the outflow side protrusion 1b of the valve case 1 is small, foreign matter may be between this inner wall and the plug blade 3c-1
It is likely to be interposed between the straight portion 3c-2 and the straight portion 3c-2. Therefore, if the valve actuating shaft 2 is operated in this state, the blade portion 3c-1 and the straight portion 3c-2 will be damaged by foreign matter, and as a result, the burr “A” shown in FIG. 2 will be generated. .

If this condition progresses further, this problem will become “I”.
It was found that this reached the sealing surface 3b-1 of the disk-shaped sealing member 3b of the valve body 3 (see Figure 2), which eventually caused a seal failure when the valve was closed, leading to hot water leakage. .

This invention was made in view of the above points,
This is intended to prevent seal failures caused by the occurrence of burrs on the flow rate control valve.

[Means for solving problems]

In order to achieve the above technical problems, this invention
A flow rate adjustment device used in a hot water heating system for an automobile, comprising a valve case having a fluid inlet and a fluid outlet, a valve operating shaft movable within the valve case, and a valve body fixed to the valve operating shaft. In the valve, the valve body is composed of a sealing member and a guide member, and a technical means is adopted in which a groove having a rectangular cross section is formed all around the outer peripheral surface of the guide member on the side of the sealing member. .

[Effect]

Therefore, according to the present invention, even if a burr occurs on the guide member due to foreign matter such as iron powder or sand, the burr will be removed in the groove with a rectangular cross section provided on the outer circumferential surface of the guide member. ” is captured, and this burr “A” can be prevented from reaching the sealing surface of the sealing member.

[Effect of idea]

Therefore, in the present invention, sealing defects caused by the occurrence of burrs on the guide member can be effectively prevented.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In the present invention, parts other than the valve body 3 have the same structure as the conventional one shown in FIG.
In FIG. 3, only the three portions of the valve body will be explained.

A plate 3a, a disk-shaped seal member 3b, a plug-shaped guide member 3c, and a plate 10 are inserted into and fixed to the narrow diameter portion 2a of the valve operating shaft 2. The plug-shaped guide member 3c is molded from a resin such as polyacetal or polypropylene, and the outer peripheral surface on the side of the seal member 3b, that is, the portion corresponding to the straight portion 3c-2 of the guide member 3c in FIG. As is clear from FIG. 3, the groove 3c has a rectangular cross-section over its entire circumference.
-3 is provided, and the straight portion 3c-2 is shortened by that much.

Since the above configuration is adopted, a foreign object is interposed between the blade portion 3c-1 of the guide member 3c and the inner wall of the outflow side protrusion 1b of the valve case 1 (see Fig. 1), and the valve body 3 is operated in this state. Even in such a case, the sealing surface 3b-1 is less likely to be damaged.

That is, in such a case, although the blade 3c-1 may be damaged to some extent and a burr "A" may be generated, the occurrence of the burr "A" is limited to the blade portion 3c-1, and the seal is damaged. Seal surface 3b- of member 3b
1, the burr “A” reaches the ring-shaped groove 3.
This is prevented by the intervention of c-3. Further, since the straight portion 3c-2 is also short in length, even if it is damaged by a foreign object, the burr generated is small, and therefore is not large enough to reach the sealing surface 3b-1 of the sealing member 3b.

In addition, in the above-mentioned embodiment, a small straight portion 3c-2 is left at the base of the guide member 3c.
Since this straight portion 3c-2 is not particularly involved in sealing, the same effect can be obtained even if the straight portion 3c-2 is partially or completely removed.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional flow control valve, Fig. 2 is a perspective view showing the valve body shown in Fig. 1 damaged by foreign objects, and Fig. 3 is a view of the valve body of the flow control valve of the present invention. It is a front sectional view showing an example. 1...Valve case, 1a...Fluid inlet, 1b...
Fluid outlet, 2... Valve operating shaft, 3... Valve body, 3b...
...Seal member, 3c...Guide member, 3c-3...
...A ring-shaped groove.

Claims (1)

[Scope of utility model registration request] a valve case having a fluid inlet and a fluid outlet;
A flow rate control valve used in a hot water heating system for an automobile, comprising a valve operating shaft movable within the valve case and a valve body fixed to the valve operating shaft,
This valve body is composed of a seal member and a guide member,
A flow control valve characterized in that a groove having a rectangular cross section is formed all around the outer peripheral surface of the guide member on the sealing member side.