JPH0522952U - Valve device - Google Patents

Abstract

(57) [Summary] [Purpose] A valve seat body in which the valve seat (2) is configured separately from the main body (1).
In the valve device provided in (20), the valve body (3) and valve seat
Even if the flow velocity of the fluid between (2) becomes high, this valve seat
The dezincification phenomenon does not occur in (2), the flow path blocking state of the valve body (3) is stable and stable for a long time, and the valve seat body (20) equipped with the valve seat (2) can be manufactured easily. To be able to make it. [Structure] The valve seat body (20) is press-molded in a form in which the umbrella-like portion (22) is extended from the tip of the tubular portion (21) by a plate material having high corrosion resistance such as stainless steel without dezincification phenomenon. In addition to the above, the valve seat (2) is defined at the boundary between the tubular part (21) and the umbrella-shaped part (22), and the valve seat (2) in the main body (1) is transparent to the inner peripheral area. A hole is formed in the through hole, and the cylindrical portion (2
Pressed in 1).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention relates to a valve device, and particularly to a valve seat structure thereof, and can be used for a solenoid valve used in a water circuit.

[0002]

[Prior art and problems]

 A conventional water circuit solenoid valve has a structure in which an electromagnetic output section is attached to a valve device.In this case, the valve device body is designed to prevent burrows during casting and to be resistant to corrosion and pressure. It was a brass cast or forged product, and the valve seat of this body was finished by cutting.

However, with the recent increase in the capacity of water heaters, the amount of water passing through the electromagnetic valve for the water circuit used therein tends to increase. On the other hand, there is a great demand for miniaturization of the solenoid valve itself. Therefore, the amount of water passing between the valve seat and the valve element facing the valve seat tends to increase, and the flow velocity of the passing water in this portion tends to increase. Under such conditions, the valve seat undergoes a dezincification phenomenon and erodes the seat. Although this phenomenon is related to the water quality, if it is used for a long period of time, the erosion of the valve seat is unavoidable, although to some extent. If the erosion is significant, the solenoid valve will be poorly sealed and water will leak.

In order to eliminate such inconvenience, as disclosed in Japanese Utility Model Laid-Open No. 58-1878, the valve seat (2) is constructed separately from the brass body (1) and It is considered to be composed of a material such as stainless steel, which has a high corrosion resistance and does not cause the dezincification phenomenon. (Refer to Fig. 1) In this case, the valve seat (2) made of the above-mentioned material does not cause the above phenomenon even under the use condition that the flow velocity with the valve body is fast. The condition of the contact surface with the valve seat will be stable for a long time.

However, in this prior art, as shown in FIG. 1, a valve seat body (20) machined into a metal cylindrical body made of a material such as stainless steel is provided with a valve seat (2). Since this is configured to be press-fitted into the main body (1) at a predetermined position, it is troublesome to manufacture the valve seat body (20). In particular, the valve seat (2), which is the contact surface with the valve body (3), is the cutting surface, so it is necessary to set the finishing process for this part with sufficient accuracy. The production of (2) becomes troublesome.

The present invention has been made in view of the above point, and is a valve device in which a valve body (3) is brought into contact with a valve seat (2) formed in a main body (1). The valve device having the valve seat (2) provided in the valve seat body (20) formed separately from the main body (1) '' and the valve seat (3) when the valve seat (3) is opened. Even if the flow velocity of fluid to and from 2) becomes high, the dezincification phenomenon does not occur in this valve seat (2) part, and the flow path blocking function of the valve body (3) is reliable for a long time. The object is to make it stable and to simplify the manufacture of the valve seat body (20) provided with the valve seat (2).

[0007]

[Technical means]

 The technical means of the present invention for solving the above-mentioned problems is that "the valve seat (20) is made of a plate material which is free from dezincification phenomena such as stainless steel and has a high corrosion resistance, and is provided from the tip of the tubular part (21) to the umbrella. In addition to being configured by press-molding the protruding portion (22), the boundary portion between the tubular portion (21) and the umbrella-shaped portion (22) serves as the valve seat (2), and A through hole is formed in the inner peripheral area of the portion where the valve seat (2) is arranged, and the tubular portion (21) of the valve seat body (20) is press-fitted into this through hole. '

[0008]

[Action]

 The above technical means act as follows. The valve seat body (20) is formed by press-molding in a form in which the umbrella-shaped portion (22) is extended from the tip of the tubular portion (21) by a plate material that is rich in corrosion resistance without dezincification phenomenon such as stainless steel. In addition, since the boundary portion between the tubular portion (21) and the umbrella-shaped portion (22) is the valve seat (2), the surface of the valve seat (2) is smooth.

Accordingly, the valve seat body (20) can be formed only by press molding, and even if the portion corresponding to the valve seat (2) is not finished, the valve seat (2) is sufficiently formed during press molding. It will be finished with excellent surface accuracy. Further, when the valve seat body (20) is attached, the tubular portion (21) is press-fitted into the through hole formed in the inner peripheral region of the valve seat mounting portion, but the umbrella-shaped portion is provided at the upper end of the tubular portion (21). There is (22), and the pressure input acts on this part. At this time, the umbrella-shaped portion (22) exerts a reinforcing function, and deformation of the valve seat (2) does not occur during the press-fitting.

[0010]

【effect】

 The valve seat body (20) can be manufactured by press molding, and the surface of the portion corresponding to the valve seat (2) is finished to a predetermined surface accuracy by press molding. ) Can be simplified. Since the constituent material of the valve seat body (20) is made of a material that is highly resistant to corrosion and does not cause dezincification, it is natural that the valve seat (2) will not corrode or dezincify. I don't have to worry.

Further, since there is no concern that the valve seat (2) will be deformed when the valve seat body (20) is press-fitted, a seal failure due to deformation of the valve seat (2) when the valve seat body (20) is press-fitted, etc. Can be prevented.

[0012]

【Example】

 Next, the embodiment of the present invention described above will be described in detail with reference to FIG. In this embodiment, the valve device of the present invention is applied to a solenoid valve for a water circuit, and the body (1) has an L-shaped circuit extending from an inlet (12) to an outlet (13). A cylindrical portion (11) is formed above the exit (13) that is open downward and coaxial therewith. The tubular portion (11) projects toward the valve chamber (14) side following the inlet (12), and the valve chamber (14) opens upward. A diaphragm (30) is attached to the valve chamber (14) in an airtight state on the outer periphery, and the central portion of the diaphragm (30) serves as the valve body (3). The valve body (3) faces the tubular portion (11).

A valve seat body (20) having an umbrella-shaped portion (22) overhanging at the upper end of the tubular portion (21) is fixed to the tubular portion (11). The tubular portion (21) is press-fitted into the tubular portion (11), and the press-fitted portion is bonded with an adhesive. The size of the umbrella-shaped portion (22) is set to be substantially equal to or slightly larger than the outer diameter of the tubular portion (11). ) Is mounted in such a manner that it substantially surrounds the tip of the tubular part (11).

Since the valve device of this embodiment is an electromagnetic valve, an electromagnetic device (4) is attached to the open end of the valve chamber (14), and the output shaft (41) of the electromagnetic device (4) is mounted. The tip of) is in contact with the central part of the diaphragm (30), and this output shaft is always urged in the direction to close the valve body (3). Therefore, when the electromagnetic device (4) is turned on, the valve body (3) is opened, and when the electromagnetic device (4) is not turned on, the valve closing force is applied to the output shaft (41) to close the valve. It becomes a state.

Therefore, in the solenoid valve of this embodiment, by controlling the operation of the electromagnetic device (4), the valve body (3) provided on the diaphragm (30) is moved according to the forward / backward movement of the output shaft (41). It opens and closes the flow path in the main body (1) by contacting and separating from the valve seat (2). The valve seat body (20) is formed by drawing a stainless steel plate having a plate thickness of 0.3 to 0.5 mm as shown in FIG. 2, and in this case, the lower end of the tubular portion (21) and The outer peripheral edge of the umbrella-shaped portion (22) has a non-smooth cut end surface, but the outer peripheral surface of the bent portion from the tubular portion (21) to the umbrella-shaped portion (22) has a small arc shape (for example, an arc with a radius of about 0.5 mm). ).

In particular, in this embodiment, the structure of the press-molding die is specially made so that the smoothness of the surface of the mold is sufficiently enhanced, and at the time of press-molding, the arc-shaped portion (corresponding to the valve seat (2) is dealt with. The surface of the mold is in contact with the surface of the mold. Therefore, at the time of this press molding, the surface of the arcuate portion becomes a smooth surface following the mold surface accuracy. In this embodiment, the airtightness of the press-fitting portion of the valve seat body (20) is secured by the adhesive, but an O-ring may be used as the airtight means.

Further, although the configuration is such that the tubular portion (21) of the valve seat body (20) is press-fitted into the through hole portion in the tubular portion (11), when the valve seat disposition portion is a plate-shaped portion. The cylindrical portion (21) may be press-fitted into the through hole formed in the plate-shaped portion.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a closed state of a conventional example.

FIG. 2 is a sectional view of a valve closed state according to an embodiment of the present invention.

FIG. 3 is a sectional view of the valve seat body (20).

[Explanation of sign]

 (1) ・ ・ ・ Main body (2) ・ ・ ・ Valve seat (3) ・ ・ ・ Valve body (20) ・ ・ ・ Valve seat body (21) ・ ・ ・ Cylinder part (22) ・ ・ ・ Umbrella part

Claims (1)

[Scope of utility model registration request] 1. A valve device in which a valve body (3) is brought into contact with a valve seat (2) formed in the main body (1), the valve seat (2) being provided as a main body (1). In the valve device provided in the valve seat body (20) configured as a separate body, the valve seat body (20) is made of stainless steel or the like, which is made of a plate material having a high corrosion resistance without dezincification phenomenon and having a high corrosion resistance. It has a structure in which the umbrella-shaped portion (22) is bulged from the tip and is press-molded, and the tubular portion (21) and the umbrella-shaped portion are formed.
The boundary with (22) is the valve seat (2), and the valve seat in the body (1) is
A valve device comprising a through hole formed in the inner peripheral region of the arrangement portion of (2), and the tubular portion (21) of the valve seat body (20) being press-fit into the through hole.