JP7254268B2 - fluid control valve - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flow control valve, and more particularly to a valve provided with an orifice member having a special structure capable of reducing water flow noise.

2. Description of the Related Art Conventionally, flow rate control valves having various structures have been put into practical use as flow rate control valves for adjusting the flow rate of a fluid in a water heater such as a hot water storage and hot water supply system. A typical flow control valve has a valve case having a fluid inlet, a fluid outlet, and a valve seat, and a valve body movable within the valve case. In many cases, an orifice member is provided between the valve seat and the fluid outlet port so that the flow rate can be adjusted by making the gap between them variable.

For example, in the flow regulating valve shown in FIG. 8 of Patent Document 1, the fluid inlet is provided with a first orifice member, and the fluid outlet is provided with a second orifice member. In this flow control valve, since the passage areas of the first and second orifice members are constant regardless of the flow rate, it is difficult to reduce water flow noise due to the pressure difference before and after passing through the flow control valve.

Therefore, in the embodiment of Patent Document 1, an opening amount changing member that changes the opening amount of an inflow passage that communicates with a valve chamber on the upstream side of the flow rate adjusting unit is provided, and the opening amount changing member advances and retreats in conjunction with the valve body. A flow regulating valve is disclosed in which a member is provided, and the opening amount is reduced according to a decrease in the flow rate by the opening amount changing member, thereby reducing water flow noise.

Japanese Patent No. 4626805

As in the flow control valve of Patent Document 1, when the opening amount changing member is provided, the structure of the valve body is affected. There is a problem that production costs are high. If the above-mentioned opening amount changing member is not provided, the pressure loss caused by the circumferential flow included in the fluid flow in the vicinity of the flow rate adjustment part consisting of the valve body and the valve seat increases, reducing water flow noise. not easy to do.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flow control valve that can reliably reduce water flow noise by incorporating an orifice member having a simple structure.

According to claim 1, there is provided a flow regulating valve comprising a cylindrically formed valve case having a fluid inlet, a fluid outlet, and a valve seat, and a valve body movable within the valve case, wherein the valve body and the valve seat to adjust the flow rate, the flow rate adjusting valve having an orifice member between the valve seat and the fluid outlet, wherein the orifice member has an orifice body for narrowing the passage area in the valve case, and one or more protrusions projecting upstream from the orifice body, the protrusion having a circumferential width of It is characterized by having a rectangular plate portion with a predetermined width and a protrusion projecting from the inner peripheral surface of the rectangular plate portion toward the central axis of the valve case .

According to the above configuration, the orifice member has an orifice body for narrowing the passage area in the valve case, and one or a plurality of projections projecting upstream from the orifice body. , the fluid passes through the orifice main body in a state in which the flow in the circumferential direction is suppressed by one or more protrusions and the flow is rectified in the direction parallel to the central axis of the fluid adjustment portion consisting of the valve body and the valve seat. , the pressure loss of the fluid is reduced, and the water flow noise is reduced. In addition, the rectangular plate portion of the protruding portion suppresses and rectifies the flow in the circumferential direction and the radial direction. Directional flow can be suppressed and rectified.

The flow control valve of claim 2 is the invention of claim 1 , wherein the fluid inlet is perpendicular to the central axis of the valve case, and the fluid outlet is formed parallel to the central axis of the valve case. A driving means is provided for axially moving the valve body back and forth within the valve case.

According to the above configuration, when the fluid flows in from the fluid introduction port perpendicular to the central axis of the valve case, is changed in direction by about 90 degrees, and flows into the flow rate adjusting section composed of the valve body and the valve seat, the flow rate adjusting section Since the pressure of the fluid becomes uneven in the circumferential direction, the fluid tends to flow in the circumferential direction, but the flow in the circumferential direction can be suppressed by the orifice member.

In the flow control valve of claim 3, in the invention of claim 2, the valve case is provided with a support portion for supporting the valve seat-side shaft portion of the valve element downstream of the valve seat, and the support portion is The orifice member is connected to the valve case by a plurality of ribs, and the projecting portion of the orifice member is arranged between the plurality of ribs.
According to the above configuration, since the protruding portion of the orifice member is arranged in the fluid flow having a high flow velocity between the plurality of ribs, the rectifying action of the protruding member can be enhanced and the water flow noise reducing action can be enhanced.

According to the present invention, various actions and effects as described above can be obtained.

It is a side view of the flow control valve concerning the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1; Fig. 10 is a perspective view of an orifice member; FIG. 4 is a diagram showing noise measurement results for the current product and the flow control valve of the present invention. In the current flow control valve, (a) is the fluid pressure distribution at position A in FIG. 6, (b) is the fluid pressure distribution at position B in FIG. 6, (c) is the fluid pressure distribution at position C in FIG. 7(d) is a diagram showing the fluid pressure distribution at position D in FIG. 6; FIG. It is a sectional view of the important part of the flow control valve of the current product. In the flow control valve of the present invention, (a) is the fluid pressure distribution at position A in FIG. 8, (b) is the fluid pressure distribution at position B in FIG. 8, (c) is the fluid pressure distribution at position C in FIG. 9(d) is a diagram showing the fluid pressure distribution at position D in FIG. 8; FIG. FIG. 2 is a cross-sectional view of the essential part of the flow control valve of the present invention;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing.
As shown in FIGS. 1 and 2, a flow control valve 1 is incorporated in a hot water storage and hot water supply system. It comprises a body 5, a holding cylinder 6, a compression spring 7, and a drive motor M (stepping motor) that drives the valve body 5 to rotate around the axis X. The valve body 5 is composed of the valve body member 3 and the spindle 4 .

The valve case 2 is made of metal or synthetic resin, and is formed in a substantially cylindrical shape having a central axis concentric with the axis X, and the valve case 2 is located below the left end portion of the valve case 2. A fluid inlet port 8 perpendicular to the central axis of the valve case 2 is integrally formed, and a fluid outlet port 9 parallel to the central axis is formed in the left end portion of the valve case 2 . A valve chamber 10 is formed inside the valve case 2, and a valve body 5 is incorporated in the valve chamber 10 so as to be movable in the left-right direction.
An annular valve seat 11 is formed at a portion of the valve case 2 corresponding to the left end of the valve chamber 10 .

The spindle 4 has a serration shaft portion 4a formed on the right end portion, a screw shaft portion 4b formed on the left side of the serration shaft portion 4a, and a seal shaft portion 4c formed on the left side of the screw shaft portion 4b. , a piston portion 4d formed on the left side of the seal shaft portion 4c, an insertion shaft portion 4e extending leftward from the piston portion 4d and inserted through the valve body member 3, and a left end of the insertion shaft portion 4e. and a valve seat side shaft portion 4f extending leftward from the . In this embodiment, the valve member 3 is made of metal, and the spindle 4 is made of a synthetic resin material such as polyphenylene sulfide resin, but may be made of a metal material.

On the downstream side of the valve seat 11, the valve case 2 is provided with an annular support portion 12 for supporting the valve-seat-side shaft portion 4f of the spindle 4. The support portion 12 is formed by three ribs 12a at positions that divide the circumference into three equal parts. It is connected with the valve case 2 .

The serrated shaft portion 4a is connected to a serrated shaft hole 13a of a drive screw member 13 on the drive motor M side so as to transmit rotation. The screw shaft portion 4b is screwed into the screw hole 6a of the holding cylinder 6, and by rotating the serration shaft portion 4a with the driving motor M, the screw shaft portion 4b, i. The valve body 5 can be driven to move forward and backward in the axial direction inside the valve case 2 . A control unit (not shown) for driving and controlling the drive motor M is provided, and this control unit precisely controls the lateral position of the valve body 5 through control of the number of steps of the drive motor M, thereby precisely controlling the flow rate. can be adjusted to

The seal shaft portion 4c is fitted in the cylinder portion 6b of the holding cylinder 6 and sealed by the seal member 14. As shown in FIG. The piston portion 4d is mounted in the cylinder hole 3a of the valve body member 3, and a seal member 15 is mounted on the outer peripheral portion of the piston portion 4d. The holding cylinder 6 is positionally regulated by a ring member 16 .

The valve body member 3 has a seal member 17a fitted in the annular groove of the valve surface portion 17, and a shaft portion 3b slightly extending leftward from the valve surface portion 17. The left end portion of the shaft portion 3b is an insertion shaft portion. It is locked by a stop ring 18 attached to 4e. The flow rate is adjusted by making the gap between the valve face portion 17 and the valve seat 11 variable.

A spring retainer 19 is fitted onto the spindle 4 at the right end of the valve body member 3, and a spring retainer cylinder 20 is fitted to the seal shaft portion 4c and the cylinder portion 6b of the retainer cylinder 6. The compression spring 7 is mounted on the spring holding tube 20, the left end of the compression spring 7 is engaged with the spring bearing 19, and the right end of the compression spring 7 is engaged with the spring bearing 20a. is stopped.

Thus, the valve body member 3 is elastically biased leftward with respect to the spindle 4 and is received by the stop ring 10 .

Next, the orifice member 30 mounted between the valve seat 11 and the fluid outlet port 9 and other orifice members will be described.
As shown in FIGS. 1 to 3, the orifice member 30 includes an orifice main body 31 having an orifice hole 30a for narrowing the passage area in the valve case 2, and three orifice members protruding upstream from the orifice main body 31. The orifice member 30 is tightly fitted and fixed to the innermost end of the flow outlet 9 .

Three projections 32 of the orifice member are formed at positions that divide the circumference into three equal parts, and these three projections 32 are respectively arranged between the three ribs 12a. Each protruding portion 32 is arranged at a portion corresponding to the central portion of the arc-shaped passage 33 between a pair of circumferentially adjacent ribs 12a.

The projecting portion 32 has a circumferential width of about 1/3 of the circumferential width of the arc-shaped passage 33 and has a wedge-shaped cross section in FIG. It has two protrusions 32b that protrude toward the central axis and are spaced apart in the circumferential direction. The protruding portion 32b protrudes from the inner peripheral surface of the upstream half of the rectangular plate portion 32a, and is formed in a trapezoidal shape when viewed from the circumferential direction.

The rectangular plate portion 32a is formed so as to partially protrude inward from the inner peripheral surface of the orifice hole 30a of the orifice body portion 31, and the two protrusions 32b are ribs perpendicular to the rectangular plate portion 32a. The radial width of the rectangular plate portion 32a and the projection portion 32b is about two-thirds that of the circular arc passage 33. As shown in FIG.
An orifice member 34 having an orifice hole having a diameter larger than that of the orifice member 30 and having an annular flat plate shape is mounted in the middle of the fluid inlet 8 .

Next, the operation and effects of the flow control valve 1 explained above will be explained.
Fig. 4 shows the measurement results of the noise value of the flow rate control valve. The flow rate control valve was housed in a container, and the water flow sound was measured at a position 1 m away while water was flowing. .
FIG. 4 shows the noise value of the current product (comparative example) and the noise value of the flow control valve 1 of the present invention. The current product (comparative example) is, as shown in FIG. 6, a flow control valve 1A equipped with a general ring-shaped flat plate-shaped orifice member 30A. In addition, in FIG. 6, the same code|symbol is attached|subjected to the same component as the flow control valve 1. As shown in FIG. As can be seen from FIG. 4, the noise value of the flow rate control valve 1 of the present invention is about 2 to 3 dB lower than the noise value of the current flow rate control valve 1A over a range of small flow rates to large flow rates. , it can be seen that the water flow noise is clearly reduced.

FIG. 5 shows the fluid pressure distribution in the vicinity of the flow regulating portion consisting of the valve element and the valve seat of the current flow regulating valve 1A, and indicates that the higher the concentration, the higher the pressure. 5(a), (b), (c) and (d) show the fluid pressure distributions at positions A, B, C and D in FIG.
FIG. 7 shows the fluid pressure distribution in the vicinity of the flow regulating portion of the flow regulating valve 1 of the present invention, and indicates that the higher the concentration, the higher the pressure. The fluid pressure distributions at positions A, B, C and D in FIG. 8 are shown in FIGS. 7(a), (b), (c) and (d).

By comparing FIG. 5 and FIG. 7, it can be seen that the flow control valve 1 of the present invention generally has a higher pressure than the current flow control valve 1A. In particular, the pressure of the flow regulating valve 1 of the present invention is obviously high at the position (position B) of the projecting portion 32 of the orifice member 30 and its downstream side. The fact that the pressure is high during and after passing through the orifice member 30 means that as a result of the straightening action of the orifice member 30, the water flows smoothly with only a slight pressure loss, and as a result, the water flow noise is also reduced. It is estimated to be.

Next, the rectifying action of the orifice member 30 will be considered.
After passing through the flow rate adjusting portion, the fluid flows toward the arc-shaped passage 33 between the three ribs 12a. Since the protruding portion 32 of the orifice member 30 protrudes, the flow in the circumferential direction is suppressed by the three protruding portions 32, and passes through the orifice hole 30a in a state in which the flow is straightened in the direction parallel to the central axis of the flow rate adjusting portion. Therefore, the pressure loss of the fluid is reduced, and the water flow noise is reduced.

In particular, since the axial center of the fluid inlet 8 is orthogonal to the central axis of the valve case 2, the fluid pressure becomes non-uniform in the circumferential direction near the flow rate adjusting portion, which tends to cause a flow in the circumferential direction. Become stronger. However, since the three protruding portions 32 of the orifice member 30 suppress the flow in the circumferential direction and rectify the flow as described above, the pressure loss of the fluid is reduced and the water flow noise is reduced.
Moreover, since the projecting portion 32 has the rectangular plate portion 32a and the projecting portion 32b projecting from the inner peripheral surface of the rectangular plate portion 32a toward the central axis, the circumferential flow of the fluid is effectively suppressed.

Next, an example in which the above embodiment is partially modified will be described.
1) The number of ribs 12a connecting the support portion 12 to the valve case 2 is not limited to three, and may be one or four or more. Similarly, the number of protruding portions 32 formed on the orifice member 30 is not limited to three, and may be one or four or more. Further, in the protruding portion 32 of the orifice member 30, the number of protruding portions 32b formed on the rectangular plate portion 32a is not limited to two, and may be one or three or more.

2) In the orifice member 30, the two protruding portions 32b may be omitted, and instead the plate thickness of the upstream half of the rectangular plate portion 32a may be increased. Moreover, although the protrusion 32b is formed only on the upstream half of the rectangular plate portion 32a, it may be formed over the entire length of the rectangular plate portion 32a.
3) In addition, those skilled in the art can implement various modifications to the above embodiment without departing from the scope of the present invention, and the present invention includes such modifications. be.

Reference Signs List 1 flow control valve 2 valve case 3 valve body member 4 spindle 4f valve seat side shaft portion 5 valve body 8 fluid inlet port 9 fluid outlet port 11 valve seat 12 support portion 12a rib 30 orifice member 31 orifice body portion 32 projecting portion 32a rectangle Plate portion 32b Projection M Drive motor

Claims (3)

A cylindrically formed valve case having a fluid inlet, a fluid outlet, and a valve seat, and a valve body movable within the valve case, wherein a gap between the valve body and the valve seat A flow rate control valve that adjusts the flow rate by making the
The orifice member has an orifice main body for narrowing the passage area in the valve case, and one or more projections projecting upstream from the orifice main body,
The flow control valve, wherein the protruding portion has a rectangular plate portion having a predetermined width in the circumferential direction, and a protruding portion protruding from the inner peripheral surface of the rectangular plate portion toward the central axis of the valve case . The fluid inlet is perpendicular to the central axis of the valve case, and the fluid outlet is formed parallel to the central axis of the valve case, and axially drives the valve body forward and backward inside the valve case. 2. A flow control valve according to claim 1, further comprising drive means. A support portion for supporting the valve seat-side shaft portion of the valve body is provided in the valve case on the downstream side of the valve seat, and the support portion is connected to the valve case by a plurality of ribs to support the orifice member. 3. The flow control valve according to claim 2, wherein the protrusion is arranged between the plurality of ribs.

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