JP3655335B2 - Flow control valve - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a flow rate adjustment valve that is inserted in the middle of a conduit for flowing a liquid and performs flow rate adjustment.
[0002]
[Prior art]
There are various types of liquid flow control valves, but when precise flow control is performed by rotating the valve body by a small angle, it opens into a valve chamber to which the upstream and downstream pipes are connected. A tadpole-shaped slit in which a flat plate-like valve element that is rotatable with one duct opening closed is disposed in the valve chamber, and the groove width at a position facing the duct opening changes as the valve element rotates. Is formed in the valve body, and the flow rate is adjusted by changing the slit width at the position facing the opening when the valve body is rotated (Japanese Utility Model Laid-Open No. 3-100509).
[0003]
[Problems to be solved by the invention]
If the flow rate adjusting valve as described above is used, the flow rate of the liquid can be adjusted relatively accurately by rotating the valve body at a small rotation angle.
[0004]
However, in order to fully open the valve, the valve body must be rotated to a position where the large-diameter portion of the tadpole-shaped slit faces the pipe opening. It cannot be fully opened.
[0005]
Therefore, for the purpose of use, such as in the case of controlling the flow rate of hot water to the radiator of an air conditioner, in order to make the change in heat dissipation linear, when the valve is fully opened, the desired performance is desired. Could not get.
[0006]
Therefore, the present invention is capable of suddenly switching from an adjustment state where the flow rate is relatively low to a fully open state in a flow rate adjustment valve in which the slit width of the valve body facing the pipe opening changes as the valve body rotates. It aims at providing a flow regulating valve.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the flow rate adjusting valve of the present invention is a flow rate adjusting valve inserted in the middle of a conduit for flowing a liquid, and is a valve in which an upstream side and a downstream side conduit are connected. A rotatable valve body is disposed in the valve chamber in a state in which at least one pipe opening that opens into the chamber is closed, and a groove width at a position facing the pipe opening changes with rotation of the valve body. A slit is formed in the valve body so that liquid flows between the valve chamber and the pipe opening through the slit, and the valve body is rotated to a fully open position. Displacement of the valve body in a direction away from the pipe opening to provide a valve body displacing means for creating a gap between the valve body and the pipe opening, and the liquid passes through the gap and the valve It is characterized by flowing between the room and the duct opening.
[0008]
The valve body displacing means is a follower and the slope cam arranged so as to ride on the slope cam when the valve body is rotated to the fully open position, and the valve body is inclined by tilting the valve body. May be provided so as to form a gap between the pipe opening and the pipe opening.
[0009]
[Action]
When the valve body is rotated to the fully open position, the valve body displacement means displaces the valve body in the direction away from the pipe opening, and the liquid passes through the gap formed between the valve body and the pipe opening. Flowing between the valve chamber and the pipe opening.
[0010]
If the valve body displacement means is composed of a slope cam and a follower, when the valve body is turned to the fully open position, the follower rides on the slope cam so that the valve body is tilted away from the pipe opening and between the two. There is a gap.
[0011]
【Example】
Embodiments will be described with reference to the drawings.
2 is a plan sectional view showing the internal structure of the flow regulating valve in a state where the valve is closed, FIG. 3 is a sectional view taken along line III-III, and FIG.
[0012]
A sealed valve chamber 3 is formed in the space between the upper surface portion of the main body block 1 and the lid body 2, and an upstream pipe line 4 and a downstream pipe line through which liquid flows from the upstream side to the downstream side 5 open to the floor surface of the valve chamber 3, respectively.
[0013]
4a is an opening of the upstream pipe line, 5a is an opening of the downstream pipe line, and an annular sealing material 6 is attached around the opening 5a of the downstream pipe line. The arrows indicate the flow direction of the liquid, but since the liquid does not flow when the valve is closed, each arrow is a broken line.
[0014]
In the valve chamber 3, a flat valve body 7 is connected to a rotatable rotating shaft 8, and the valve body 7 is moved inside the valve chamber 3 by rotating the rotating shaft 8 from the outside. Rotate.
[0015]
The rotating shaft 8 is disposed at a position where lines drawn from the axial center toward the centers of both the upstream and downstream duct openings 4a and 5a intersect at a substantially right angle. As shown in FIG. 2, the valve body 7 is formed in a fan shape that closes both the pipe openings 4 a and 5 a at the same time. When the valve is closed, the valve body 7 has both pipe openings 4 a and 4 a, It faces 5a.
[0016]
As shown in FIGS. 3 and 4, the valve body 7 and the rotary shaft 8 are connected by a small connecting pin 9, and the valve body 7 can be freely tilted around the connecting pin 9. It is like that.
[0017]
The valve body 7 is provided with a tadpole-shaped slit 10 having no legs on a circle whose radius is the distance from the center of the rotating shaft 8 to the center of both the duct openings 4a and 5a. The groove width of the slit 10 is narrow on the side close to the opening 5a of the downstream side pipe, and wide on the side close to the upstream side pipe opening 4a.
[0018]
As shown in FIG. 2, in the valve-closed state, the slit 10 is formed so as not to face the position facing the opening 5 a of the downstream pipe line, and the valve body 7 surrounds the opening 5 a of the downstream pipe line. The opening 5a of the downstream pipe line is completely closed by closely contacting with the liquid 6 under pressure of the liquid.
[0019]
A pin 11 protrudes outward from the side end surface of the valve body 7 in a direction orthogonal to the connecting pin 9. When the valve is closed, the pin 11 is close to the upstream pipe opening 4 a. Is located.
[0020]
On the floor surface of the valve chamber 3, a slope cam 12 projects from the downstream side of the duct outlet 5 a. In FIG. 2, the slope is indicated by oblique lines. The slope cam 12 is disposed at a position along the outer periphery of the valve body 7, and as shown in FIG. 5, by rotating the rotary shaft 8 and rotating the valve body 7 in the arrow A direction, It moves in a direction approaching the slope cam 12.
[0021]
When the valve body 7 is rotated in that direction, the slit 10 comes to a position opposite to the opening 5 a of the downstream pipe line, so that the liquid entering the valve chamber 3 from the upstream pipe line 4 passes through the slit 10. Then, it starts to flow from the valve chamber 3 to the downstream pipe line 5.
[0022]
When the rotation angle of the valve body 7 is increased, the width of the slit 10 at the position facing the opening 5a of the downstream side pipe gradually increases, so that the liquid flow rate gradually increases. However, since the maximum width of the slit 10 is considerably narrower than the diameter of the opening 5a of the downstream pipe, the absolute flow rate of the liquid that passes through the slit 10 and enters the opening 5a of the downstream pipe is relatively small.
[0023]
However, when the valve body 7 is rotated to the final maximum flow rate state, the valve body 7 is rotated as indicated by the arrow B in FIG. 6, and the pin 11 rides on the slope cam 12 and is indicated by the arrow C. Thus, the valve body 7 is lifted. Therefore, the pin 11 is a follower of the slope cam 12.
[0024]
FIG. 1 and FIG. 7 show this state. As shown in FIG. 1, the valve body 7 is lifted by the inclined cam 12 and tilted around the connecting pin 9 to seal the opening 5a of the downstream pipe line. A gap is formed between the material 6. As a result, the liquid in the valve chamber 3 not only passes through the slit 10 but also flows from the valve chamber 3 into the opening 5a of the downstream pipe line through the gap as indicated by an arrow C.
[0025]
On the other hand, as shown in FIG. 7, the upstream pipe opening 4 a is almost completely opened to the valve chamber 3 by the movement of the valve body 7. Accordingly, there is no resistance to liquid inflow from the upstream side pipe 4 into the valve chamber 3.
[0026]
FIG. 8 shows the relationship of the flow rate with respect to the rotation angle of the valve body 7 of the above-described embodiment device, and the flow rate change is relatively small up to point M until the valve body 7 starts to be lifted by the inclined cam 12. When 7 is lifted by the slope cam 12, the flow rate suddenly increases and reaches a fully open state.
[0027]
In addition, this invention is not limited to the said Example, For example, the slope cam 12 may be provided in the valve body 7, and a follower may be provided in the valve chamber 3 side, and it moves in parallel, without inclining the valve body 7. You may make it make it. Further, the valve body 7 may be disposed so as to face the upstream side pipe opening 4a, and reinforcement may be performed so that the valve body 7 does not float.
[0028]
【The invention's effect】
According to the present invention, when the valve body is rotated to the fully open position, the valve body is displaced away from the pipe opening to form a gap between them, and the liquid passes through the gap to the valve chamber and the pipe. Since it flows between the passage openings, it is possible to suddenly make the flow fully open from an adjustment state where the flow rate is relatively low, and to obtain a desired flow rate characteristic corresponding to the usage needs.
[0029]
Then, when the valve body is rotated to the fully open position, if the follower climbs onto the slope cam so that the valve body is inclined and a gap is formed between the opening and the duct opening, the present invention can be made very easily. Can be configured.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an embodiment in a fully opened state.
FIG. 2 is a plan sectional view of the embodiment in a fully closed state.
FIG. 3 is a front (III-III) cross-sectional view of the embodiment in a fully closed state.
FIG. 4 is a side (IV-IV) cross-sectional view of the embodiment in a fully closed state.
FIG. 5 is a partial perspective view of the embodiment.
FIG. 6 is a partial perspective view of the embodiment in a fully opened state.
FIG. 7 is a cross-sectional plan view of the embodiment in a fully opened state.
FIG. 8 is a flow characteristic diagram of the example.
[Explanation of symbols]
3 Valve chamber 4 Upstream pipe line 5 Downstream pipe line 5a Downstream pipe opening 7 Valve body 8 Rotating shaft 10 Slit 11 Pin 12 Slope cam

Claims (1)

A flow regulating valve inserted in the middle of a conduit for flowing liquid, and at least one conduit opening that opens on the floor surface of the valve chamber to which the upstream and downstream conduits are connected is blocked. A plate-shaped valve body that is rotatable in a state is disposed in the valve chamber, and a slit is formed in the valve body in which a groove width at a position facing the pipe opening changes with the rotation of the valve body, In what the liquid flows between the valve chamber and the pipe opening through the slit,
Protruding a pin on the side end surface of the flat valve body, and projecting a slope cam on the floor surface of the valve chamber so that the pin rides up when the valve body is rotated to the fully open position,
When the valve body is rotated to the fully open position, the pin rides on the slope cam, so that the valve body is inclined and a gap is formed between the flat portion of the flat valve body and the pipe opening. Is formed so that the liquid flows through the gap between the valve chamber and the pipe opening.

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