JPS594201Y2 - flow regulating valve - Google Patents

Description

[Detailed description of the invention] Generally speaking, the present invention relates to a flow rate adjustment valve that adjusts the flow rate of fluid, and more specifically, the present invention relates to a flow rate adjustment valve that is suitable for use in adjusting the flow rate of hot water in a hot water heating system for an automobile. It concerns valves.

Conventionally, this type of flow regulating valve has a structure as shown in FIG. 1, for example, and the one shown in FIG.
34334, etc., by moving the valve operating shaft 2 upward in the diagram, first the inner valve 11 fixed to the valve operating shaft 2 and the outer valve 11 crimped to the valve seat 1a of the case 1 are separated. The groove 11a is opened between the valve 10 and the groove 11a.
When the minute flow rate is controlled by the passage 1a and the valve operating shaft 2 is moved by a predetermined stroke L or more, the valve operating shaft 2
The plate 15 at the tip moves the outer valve 10 as well, and by opening the outer valve 10, a large flow rate is controlled.

By the way, in a hot water heating system for an automobile, a flow rate regulating valve is usually installed in the vehicle interior together with a heat exchanger (hot water radiator).

Therefore, in order to reduce the noise inside the vehicle, it is desired to reduce the noise generated from the flow rate regulating valve as much as possible.

The inventors of the present invention conducted various experiments on the causes of noise in the flow rate regulating valve and found that the noise is caused by the vibration of the elastic sealing material 13 made of an O-ring fixed to the valve operating shaft 2.

That is, in the conventional structure, the sealing material contact surface 10C of the outer valve 10, which the elastic sealing material 13 comes into pressure contact with, is formed in a tapered shape that becomes lower toward the center as shown in FIG. When the valve is opened, hot water from the inlet 1a flows downward in the figure along the sealing material contact surface 10C, so the elastic sealing material 13 is extended into the gap between the sealing material contacting surface 10c and the elastic sealing material 13. A suction force is generated, and the elastic sealing material 13 is expanded.

However, when the elastic repulsive force of the elastic sealing material 13 becomes larger than the above-mentioned suction force, the elastic sealing material 13 conversely contracts by its own elastic force.

It has been found that vibration noise is generated from around the elastic sealing material 13 by continuously repeating the expansion and contraction of the elastic sealing material 13.

This invention was made based on the knowledge obtained from the above experimental studies, and aims to prevent the phenomenon in which the annular elastic sealing material repeatedly expands and contracts continuously and vibrates when the inner valve is slightly opened. With the goal.

In order to achieve the above object, the present invention provides a flow rate regulating valve that includes a case having a fluid intake and a fluid outlet, a valve actuation shaft movable within the case, and a minute flow control device fixed to the valve actuation shaft. and an outer valve for large flow rate control which is loosely fitted around the outer periphery of the inner valve, is normally pressed against the valve seat of the case, and opens when the valve operating shaft is operated over a predetermined stroke. an annular elastic sealing member that is fitted and held on the valve operating shaft and in pressure contact with the outer valve to close the fluid passage of the inner valve when the valve operating shaft is in a fully closed position; a sealing material contact surface of the outer valve that is configured to open both the valves by moving the inner valve in a direction opposite to the fluid flow direction, and that the elastic sealing material comes into pressure contact with the valve operating shaft in a fully closed position; A technical measure is adopted in which the tapered shape is formed in a tapered shape, and the inclination direction of the tapered shape is set in a direction in which fluid flowing from the fluid population to the sealing material contact surface flows toward the elastic sealing material.

According to the present invention, by having the above technical means,
When the valve operating shaft is operated to a position where the inner valve slightly opens, the fluid flowing from the fluid inlet of the valve case to the sealing material contacting surface of the outer valve elastically moves along the tapered slope of this sealing material contacting surface. The fluid flows toward the sealing material, and this fluid flow applies only a force in the compressive direction to the elastic sealing material.
As a result, the elastic sealing material is only compressively deformed, and it is possible to reliably prevent the vibration phenomenon (continuously repeated phenomenon of expansion and contraction) of the elastic sealing material, and eliminate the noise caused by this vibration phenomenon.

In addition, in the present invention, noise reduction in the flow rate regulating valve can be achieved with an extremely simple configuration in which the inclination direction of the tapered shape of the sealing material contact surface formed on the outer valve is changed, so it is possible to reduce noise at an extremely low cost. The effect is that it can be easily implemented.

Moreover, since the vibration phenomenon of the elastic sealing material can be prevented, the fatigue of the elastic sealing material itself can be reduced and the durability thereof can be improved.

The present invention will be described below with reference to embodiments shown in the drawings.

Figures 3 and 4 show an embodiment in which the present invention is applied to a hot water flow rate regulating valve of a hot water type heating system for an automobile. 1 is a case of a flow rate regulating valve, a hot water population 1a and a hot water outlet 1.
It has b.

Reference numeral 2 denotes a valve operating shaft movable within the case 1, one end of which projects to the outside of the case 1 and is connected to an operating lever link mechanism (not shown).

This lever link mechanism can be manually operated from the operating knob on the control panel of the heating device.

Here, the valve operating shaft 2 is operated in a direction opposite to the flow of hot water flowing from the inlet 1a to the outlet 1b (upward in the figure).

Note that the lever link mechanism may be automatically operated by a temperature detection mechanism that detects the temperature of air blown from the heating device.

Reference numeral 3 denotes a mounting bracket caulked and fixed to the end of the case 1, and 4.5 denotes a guide member for the valve operating shaft 2, which is formed into an annular shape.

6 is an elastic sealing material that seals between the outer circumferential side of the guide member 5 and the inner surface of the case 1; 7 is an elastic sealing material that seals between the inner circumferential side of the guide member 5 and the valve operating shaft 2; Both sealing materials 6.7 are made of O-rings.

B connects both guide members 4 and 5 to case 1 and bracket 3.
It is a plate for fixing between the case 10 and the case 10 and is supported by the stepped portion IC.

A coil spring 9 is disposed between the plate 9 and a resin outer valve 10 for controlling a large flow rate, and presses the outer valve 10 onto the valve seat 1d of the case 1.

Reference numeral 11 denotes a resin inner valve for minute flow control, which is fixed to the valve operating shaft 2.

The outer valve 10 is loosely fitted to the outer peripheral surface of the inner valve 11.

Reference numeral 12 denotes an elastic sealing material made of an O-ring fitted and fixed in an annular groove 10a on the outer periphery of the outer valve 10, and is used to maintain a seal between the outer valve 10 and the valve seat 1d.

13 is an annular elastic sealing material made of an O-ring that is fitted to the valve operating shaft 2 with a certain degree of interference; 14 is a plate for supporting this sealing material, which is loosely fitted to the valve operating shaft 2 and has a step. It is positioned by the attaching portion 2a.

Reference numeral 15 denotes a plate caulked and fixed to the tip of the valve operating shaft 2.
is fixed.

In addition, the elastic sealing material 13 is connected to the end surface of the inner valve 11 and the plate 1.
4 and is fitted and held on the valve operating shaft 2.

A plurality of grooves 11a are formed in the outer peripheral surface of the inner valve 11 in the axial direction thereof.

A plurality of wing-shaped projecting pieces 10b are integrally molded at the lower part of the outer valve 10 to guide the outer valve 10 and the case 1.

Furthermore, the sealing material contacting surface 10C of the outer valve 10 (the surface with which the elastic sealing material 13 comes into contact) is formed into a tapered shape that becomes higher toward the center, as shown in detail in FIG.

In other words, the sealing material contacting surface 10C of the outer valve 10 is formed into a tapered shape, and the hot water flowing into the sealing material contacting surface 10C from the hot water supply port 1a is directed toward the elastic sealing material 13 in the direction of inclination of this tapered shape. Set in the direction of flow.

Next, the operation of the above configuration will be explained.

The illustrated state in FIG. 3 shows a state in which the valve actuating shaft 2 is operated to the fully closed position, and in this state, the elastic sealing material 12 of the outer valve 10 is pressed against the valve seat 1d of the case 1 by the spring 9.
At the same time, the elastic sealing material 13 of the valve operating shaft 2 is pressed against the sealing material contact surface 10C of the outer valve 10.

Therefore, both the passage between the inner valve 11 and the outer valve 10 and the passage between the outer valve 10 and the case 1 are completely closed, and the flow of hot water from the hot water outlet 1a is blocked.

Next, when the valve operating shaft 2 is slightly moved upward in the figure, the elastic sealing material 13 is separated from the sealing material contact surface 10C of the outer valve 10, and the groove 11a on the outer periphery of the inner valve 11 is moved toward the hot water inlet 1a side. It will open in .

As a result, a small amount of hot water flows through the groove 11a toward the hot water outlet 1b.

During this minute flow rate control, the sealing material contact surface 10 of the outer valve 10
Hot water flows over the elastic sealant 13, but in the present invention, the sealing material contact surface 10C is tapered to become higher toward the center. A force in the direction of pushing up the sealing material 13, that is, a force in the direction of compressing the sealing material 13, is applied.

As a result, the elastic sealing material 13 is only subjected to a force in the compression direction and does not vibrate continuously, so that no vibration noise is generated.

When the valve operating shaft 2 is moved by a predetermined stroke L or more, the plate 15 at the tip of the valve operating shaft 2 moves against the protruding piece 10 of the outer valve 10.
b, the outer valve 10 also moves at the same time, and the outer valve 1
A passage between case 0 and case 1 is opened, and a large amount of hot water flows through this passage from port 1a to outlet 1b.

It goes without saying that the present invention can be widely applied not only to flow rate regulating valves for hot water but also to flow regulating valves for various fluids.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional flow rate regulating valve, Fig. 2 is a longitudinal cross-sectional view of the outer valve shown in Fig. 1, and Fig. 3 is a longitudinal cross-sectional view showing an embodiment of the flow regulating valve of the present invention. , FIG. 4 is a longitudinal sectional view of the outer valve shown in FIG. 3. 1...Case, -1a...Hot water (fluid) inlet, 1b...Hot water (fluid) outlet, 1d...
...Valve seat, 2...Valve operating shaft, 10...
...Outer valve, 10 C...Tapered sealing material contact surface, 11...Inner valve, 13...Elastic sealing material.

Claims (1)

[Scope of utility model registration request] A case having a fluid inlet and a fluid outlet, a valve operating shaft that is movable within the case, an inner valve for minute flow control fixed to the valve operating shaft, and a valve that is loosely fitted to the outer periphery of the inner valve and is always on. is a large flow control outer valve that is crimped onto the valve seat of the case and opens when the valve operating shaft is operated over a predetermined stroke; and an outer valve that is fitted and held by the valve operating shaft to fully close the valve operating shaft. and an annular elastic sealing member that presses against the outer valve to close the fluid passage of the inner valve, and the valve actuating shaft moves in the case in a direction opposite to the fluid flow direction to close both the valves. The sealing material contacting surface of the outer valve is configured to open the valve, and the sealing material contacting surface of the outer valve is in pressure contact with the elastic sealing material at the fully closed position of the valve operating shaft, and the inclination direction of this tapered shape is A flow rate regulating valve characterized in that the fluid flowing into the sealing material contact surface from the fluid inlet is set in a direction such that it flows toward the elastic sealing material.