JPH0113896Y2 - - 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. 4, 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 adjustment male screw 3 for moving the plunger 2 by screwing into the flow rate adjustment female screw 1b provided on the flow rate control throttle body 1, and a flow rate adjustment male screw 3 near the screw head of this flow rate adjustment male screw, A circumferential groove 6 for fitting and holding a sealing material 5 such as an O-ring or a fitting recess 7 in which the O-ring 5 slides must be formed in the main body 1. Therefore, in the case of such a conventional male thread for flow rate control, 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. 7, the shape of the male thread for controlling the flow rate and its supporting portion becomes complicated, and furthermore, there are problems in that the size of the male thread is increased. Furthermore, conventionally, as shown in FIG. 5, 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. However, in this case, the threads, or pitches, of the bead 5a must be formed to be equal and continuous to the pitches of the male thread 3, so the dimensional accuracy of the male thread 3 and the bead 5a and High positional accuracy is required, which poses problems such as the inability to obtain an economical flow control valve.

[Purpose of invention]

This idea was created by focusing on these conventional problems, and by using a beaded seal rubber member to seal the male threaded part for flow rate control,
It is an object of the present invention to provide a flow control valve that can solve the above problems.

[Example of idea]

This invention will be explained below based on FIGS. 1 to 3.

First, to explain the configuration, 1 is a flow rate control throttle body, a plunger 2 that opens and closes an orifice 1a provided in the flow rate control throttle body 1, and a female screw for flow rate adjustment provided in the flow rate control throttle body 1. 1b to move the plunger 2; and a male threaded part 3 for adjusting the flow rate, which is provided in close proximity to the male threaded part 3 for adjusting the flow rate, and is larger than the root diameter of the thread groove of the female screw thread 1b for adjusting the flow rate. One or more beads 4a with a somewhat large outer diameter and parallel to the axial direction
on the circumferential surface, and the inner diameter of the female thread 1b for flow control
It has an outer diameter D that is somewhat larger than D ₀ . It is composed of a seal rubber member 4.

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 flow rate adjustment screw 1b, the outer diameter D portion is press-fitted into the inner diameter D ₀ portion, thereby preventing fluid from leaking in the axial direction. Therefore, the only leakage in the seal rubber member 4 is spiral leakage along the thread groove of the female flow rate adjustment screw 1b. but,
The seal rubber member 4 is provided in the axial direction with a bead 4a having an outer diameter slightly larger than the root diameter of the female thread 1b for adjusting the flow rate. It is deformed into a shape that fills the thread groove by shearing, etc., thereby completely preventing spiral leakage.

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 flow rate control, and the outer surface of the sealing rubber member is The flow control valve is characterized in that a bead is provided in the axial direction, which is slightly larger than the root diameter of the female thread into which the male threaded portion is screwed.

[Effect of idea]

Therefore, according to the present invention, the internal pressure can be effectively sealed simply by providing the seal rubber member 4 having an axial bead 4a on one side of the flow rate adjusting threaded portion 3 of the plunger 2. Sealing performance of the flow control valve can be ensured with a simple structure. Further, the seal rubber member 4 having the bead 4a is attached to the shaft portion 3a of the male threaded portion 3 for adjusting the flow rate.
In order to fix the seal rubber member 4 and the bead 4a, it is preferable to manufacture a mold having a space corresponding to the seal rubber member 4 and the bead 4a, set the mold on the shaft portion 3a, and then pour molten rubber into the space to fix it. At this time, since the bead 4a is not thread-shaped but has an axial protrusion, the pitch of the bead 4 can be adjusted to match the pitch of the male thread 3 for flow control, compared to the case where the thread-shaped bead shown in FIG. 5 is made. There is also the advantage that there is no need to fit them together so that the mold can be manufactured easily.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the flow control valve according to the present invention, Figure 2 is a detailed view of its bead, Figure 3 is a side view of Figure 2, and Figure 4 is a cross section of a conventional flow control valve. 5 are detailed views of the bead portion of a conventional flow rate regulating valve with a threaded bead. 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 having a plunger having a male threaded part for flow rate control in a fluid path for oil, air, etc., a seal rubber member is provided on one side of the male threaded part for flow rate control, and the male threaded part is screwed onto the outer surface of the seal rubber member. A flow control valve characterized by having a bead in the axial direction that is slightly larger than the diameter of the female thread.