JPH0218867Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a flow control valve in which the sealing performance of the flow control screw portion of the flow control valve is improved.

[Conventional technology]

A conventional flow control valve equipped with a flow control screw is shown in FIG. 3, for example. That is, this flow control valve has a plunger 2 that opens and closes an orifice 1a provided in a flow control throttle body 1.
, a flow rate adjusting male screw 3 for moving the plunger 2 by screwing into the flow rate adjusting female screw 1b provided on the flow rate controlling throttle body 1, and an O screw near the screw head of this flow rate adjusting male screw. A circumferential groove 6 for fitting and holding a sealing material 5 such as a ring or a fitting recess 7 in which the O-ring 5 slides had to be formed in the main body 1. Therefore, in the case of such a conventional male thread for flow rate adjustment, a circumferential groove 6 for fitting and holding the sealing material 5 must be provided in addition to the threaded portion, and the main body 1 is provided with a fitting recess. Since we have to form 7,
Problems arise in that the shape of the male thread for flow rate control and its support part becomes complicated, and furthermore, it becomes larger. Furthermore, conventionally, as shown in FIG. 4, a threaded bead 5a made of rubber that is screwed into the female thread 1b of the main body 1 is attached to a part of the male thread 3a, and this bead 5a is fitted into the female thread 1b. In some cases, the bead 5a is used for sealing.
Since the threads, that is, the pitches of the external threads 3 must be formed to be equal and continuous with the pitches of the external threads 3, high dimensional accuracy and positional accuracy are required for the external threads 3 and the bead 5a. There were problems such as not being able to obtain a flow control valve.

[Purpose of invention]

This invention was made by focusing on these conventional problems, and created a flow control valve that can solve the above problems by using a beaded seal rubber member to seal the threaded part for flow control. is intended to provide.

[Example of idea]

This invention will be explained below based on FIGS. 1 and 2.

First, to explain the configuration, reference numeral 1 denotes a flow rate control throttle body, a plunger 2 for opening and closing an orifice 1a provided in the flow rate control throttle body 1, and a female flow rate adjustment screw 1b provided in the flow rate control throttle body 1. A male threaded portion 3 for adjusting the flow rate which is screwed into the male threaded portion 3 for adjusting the flow rate to move the plunger 2; One or several beads 4 that are circular in shape and rotate in the circumferential direction.
a, and the inner diameter of the female thread 1b for flow rate control D ₀
A seal rubber member 4 having a slightly larger outer diameter D than
It consists of

Next, to explain its action, the plunger 2
When a driver (not shown) is inserted into the driver groove 2a and turned, the plunger 2 rotates.
The male threaded portion 3 for flow rate adjustment, which is formed integrally with the flow rate adjustment female thread 1b, is screwed into the female threaded portion 1b for flow rate adjustment. According to this screwing, the seal rubber member 4 incorporated in the plunger 2 and the bead 4a formed integrally with this seal rubber member 4 are screwed into the female thread for flow rate adjustment 1b. At this time, since the outer diameter D of the seal rubber member 4 is somewhat larger than the inner diameter D ₀ of the female thread 1b for flow rate adjustment,
As a result of the outer diameter D portion being press-fitted into the inner diameter D ₀ portion, leakage of fluid in the axial direction is prevented. Therefore, the only leakage in the seal rubber member 4 is spiral leakage along the thread groove of the female flow rate adjusting screw 1b. but,
The seal rubber member 4 is integrally formed with a bead 4a having a cross-sectional shape slightly larger than the shape of the female thread groove for flow rate adjustment, and as a result of the bead 4a being bitten into the thread groove of the female thread 1b for flow rate adjustment, the thread groove is formed. Spiral leakage along the line is also completely blocked. Therefore, the bead 4a need not be formed into a thread shape since it is sufficient to stop the spiral leakage at one point along the thread groove.

Note that the device of the present invention can also be used to seal parts using screws other than the above-mentioned flow control valve.

[Summary of the idea]

As described above, the present invention provides a flow control valve in which a plunger having a male threaded portion for flow rate control is provided in a fluid path for oil, air, etc., in which a sealing rubber member is provided on one side of the male threaded portion for controlling flow rate, and the outer surface of the sealing rubber member is The flow control valve is characterized in that a bead, which is slightly larger than the thread groove shape of the female thread into which the male threaded portion is screwed, is provided in a circumferentially annular shape.

[Effect of idea]

Therefore, according to the present invention, the internal pressure can be effectively sealed simply by providing the sealing rubber member 4 having the circumferentially annular bead 4a formed on one side of the male threaded portion 3 for adjusting the flow rate in the plunger 2. Therefore, the sealing performance of the flow control valve can be ensured with a simple structure. Also, bead 4
In order to fix the seal rubber member 4 having a diameter of 1.a to the shaft portion 3a of the male screw 3 for flow rate adjustment, a mold having a space corresponding to the seal rubber member 4 and the bead 4a is manufactured, and after setting the mold on the shaft portion 3a, It is preferable to pour molten rubber into the space and fix it. At this time, since the bead 4a is not thread-shaped but ring-shaped, the pitch of the bead is made to be continuous with the pitch of the male thread 3 for flow rate control, compared to the case where the thread-shaped bead shown in FIG. 4 is made. There is also the effect that there is no need to match the mold, making it easy to manufacture the mold.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the essential parts of the flow control valve according to the present invention, Fig. 2 is a detailed view of its bead portion, Fig. 3 is a cross-sectional view of a conventional flow control valve, and Fig. 4 is a conventional threaded bead. FIG. 3 is a detailed view of a bead portion of the attached flow rate regulating valve. DESCRIPTION OF SYMBOLS 1... Throttle body for flow rate control, 2... Plunger, 3... Male threaded part for flow rate adjustment, 3a... Shaft part,
4... Seal rubber member, 4a... Bead, 5...
O-ring.

Claims (1)

[Scope of utility model registration request] In a flow control valve in which a plunger having a male thread for flow rate control is provided in the fluid path for oil, air, etc.
A sealing rubber member is provided on one side of the male threaded portion for flow rate control, and a bead that is slightly larger than the thread groove shape of the female thread into which the male threaded portion is screwed is provided on the outer surface of the sealing rubber member in a circumferentially annular shape. Characteristic flow control valve.