JP2020101263A - Fluid regulation valve - Google Patents

Abstract

To provide a flow amount regulation valve capable of reliably reducing noise of running water with an orifice having a simple structure installed therein.SOLUTION: A flow amount regulation valve (1) comprises: a valve case (2) which has a fluid inlet port (8), a fluid outlet port (9) and a valve seat (11); and a valve body (5) which is movable inside the valve case (2). The fluid regulation valve (1) regulates a flow rate of fluid by variably changing a gap between the valve body (5) and the valve seat (11). The flow amount regulation valve (1) also has an orifice member (30) between the valve seat (11) and the fluid outlet port (9). The orifice member (30) has: a main orifice body section (31) which reduces a flow passage area inside the valve case (2); and one or more protruded section (32) protruded from the main orifice body section (31) toward an upstream side.SELECTED DRAWING: Figure 2

Description

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

Conventionally, flow rate adjusting valves having various structures have been put to practical use as flow rate adjusting valves for adjusting the flow rate of fluid in a hot water supply apparatus such as a hot water storage and hot water supply apparatus. A general flow rate adjusting valve has a valve case having a fluid inlet, a fluid outlet, and a valve seat, and a valve body movable in the valve case, and includes a valve body and the valve seat. In many cases, the flow rate can be adjusted by making the gap therebetween variable, and an orifice member is often provided between the valve seat and the fluid outlet.

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

Therefore, in the embodiment of Patent Document 1, an opening amount changing member that changes the opening amount of the inflow passage that communicates with the valve chamber on the upstream side of the flow rate adjusting unit, and changes the opening amount that moves forward and backward in conjunction with the valve body. There is disclosed a flow rate adjusting valve in which a member is provided, and the opening amount is changed by the opening amount changing member to reduce the opening amount to reduce water flow noise.

Japanese Patent No. 4626805

When the opening amount changing member is provided like the flow rate adjusting valve of Patent Document 1, since the structure of the valve element is affected, a normal valve element cannot be applied as the valve element of the flow rate adjusting valve. There is a problem that the production cost becomes expensive. When the above-mentioned opening amount changing member is not provided, the pressure loss due to the circumferential flow included in the flow of the fluid near the flow rate adjusting unit consisting of the valve body and the valve seat becomes large, and the water flow noise is reduced. Not easy to do.

An object of the present invention is to provide a flow rate adjusting valve that can surely reduce water flow noise by incorporating an orifice member having a simple structure.

The flow rate adjusting valve according to claim 1 has a valve case having a fluid inlet, a fluid outlet, and a valve seat, and a valve body movable in the valve case, and the valve body and the valve seat. A flow rate adjusting valve for adjusting a flow rate by making a gap between the valve seat and the fluid outlet port variable, wherein the orifice member is the valve case. It is characterized by having an orifice body for narrowing the passage area inside and one or a plurality of projecting portions projecting upstream from the orifice body.

According to the above configuration, the orifice member has the orifice main body portion for narrowing the passage area in the valve case, and one or a plurality of protruding portions protruding from the orifice main body portion toward the upstream side. , Because the fluid passes through the orifice main body in a state in which the flow in the circumferential direction is suppressed by the one or more protrusions and is rectified into the flow in the direction parallel to the central axis of the fluid adjusting portion including the valve body and the valve seat. , The pressure loss of the fluid is reduced, and the water flow noise is reduced.

According to a second aspect of the present invention, in the flow control valve of the first aspect, the valve case is formed in a substantially cylindrical shape, the fluid inlet port is orthogonal to the central axis of the valve case, and the fluid outlet port is the valve case. Is formed in parallel with the central axis of the valve body and is provided with a drive means for axially advancing and retracting the valve body inside the valve case.

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

According to a third aspect of the present invention, in the flow control valve according to the second aspect of the invention, a support portion that supports a valve seat side shaft portion of the valve body is provided in the valve case downstream of the valve seat, and the support portion is A plurality of ribs are connected to the valve case, and the protrusion 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, it is possible to enhance the rectifying function of the protruding member and enhance the water flow noise reducing effect.

According to a fourth aspect of the present invention, in the flow control valve according to the third aspect of the invention, the protrusion has a rectangular plate portion having a predetermined circumferential width and a protrusion protruding from the inner peripheral surface of the rectangular plate portion toward the central axis. It is characterized by having a part.
According to the above configuration, the rectangular plate portion of the protruding portion can suppress the flow in the circumferential direction and the flow in the radial direction to rectify the flow, and the protruding portion protruding from the inner peripheral surface of the rectangular plate portion toward the central axis. Thus, flow in the circumferential direction can be suppressed and rectified.

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

It is a side view of the flow regulating valve concerning the embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is a perspective view of an orifice member. It is a diagram which shows the noise measurement result about the current product and the flow control valve of this invention. In the flow control valve of the current product, (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. 7D is a diagram showing a fluid pressure distribution at position D in FIG. It is sectional drawing of the principal part of the flow control valve of the present product. In the flow rate control valve of the present invention, (a) is a fluid pressure distribution at position A in FIG. 8, (b) is a fluid pressure distribution at position B in FIG. 8, (c) is a fluid pressure distribution at position C in FIG. FIG. 9D is a diagram showing the fluid pressure distribution at position D in FIG. 8. It is sectional drawing of the principal part of the flow control valve of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the flow rate adjusting valve 1 is incorporated in a hot water storage and hot water supply device.
The flow rate adjusting valve 1 includes a valve case 2, a valve body 5, a holding cylinder 6, and a compression spring 7, which are housed in the valve case 2, respectively, and a drive for rotationally driving the valve body 5 about an axis X. And a motor M (stepping motor). 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 above-mentioned axis X, and the valve case 2 is provided below the left end portion of the valve case 2. A fluid introduction port 8 orthogonal to the central axis of the valve is formed integrally, and a fluid outlet 9 parallel to the central axis is formed at 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 in a portion of the valve case 2 corresponding to the left end of the valve chamber 10.

The spindle 4 includes a serration shaft portion 4a formed on the right end portion, a screw shaft portion 4b formed on the left side portion of the serration shaft portion 4a, and a seal shaft portion 4c formed on the left side portion of the screw shaft portion 4b. And 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 into 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 valve seat side shaft portion 4f. In this embodiment, the valve body member 3 is made of metal, and the spindle 4 is made of, for example, a synthetic resin material such as polyphenylene sulfide resin, but it may be made of a metal material.

On the downstream side of the valve seat 11, an annular support portion 12 for supporting the valve seat side shaft portion 4f of the spindle 4 is provided on the valve case 2, and the support portion 12 is formed by three ribs 12a at three circumferential positions. It is connected to the valve case 2.

The serration shaft portion 4a is connected to the serration shaft hole 13a of the drive screw member 13 on the drive motor M side so as to be rotatable. 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 by the drive motor M, the screw shaft portion 4b, that is, the spindle 4 is moved to the left and right with respect to the holding cylinder 6. The valve body 5 can be axially moved forward and backward within the valve case 2. A control unit (not shown) for driving and controlling the drive motor M is provided, and the control unit precisely controls the horizontal position of the valve body 5 through the step number control of the drive motor M to precisely control the flow rate. Can be adjusted to.

The seal shaft portion 4c is fitted in the tubular portion 6b of the holding barrel 6 and is sealed by the seal member 14. The piston portion 4d is attached to the cylinder hole 3a of the valve body member 3, and the seal member 15 is attached to 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 mounted in an annular groove of the valve face portion 17, and a shaft portion 3b slightly extending leftward from the valve face portion 17, and a 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 surface portion 17 and the valve seat 11 variable.

At the right end of the valve body member 3, a spring receiver 19 is externally fitted and attached to the spindle 4, and a spring holding cylinder 20 is externally mounted on the seal shaft portion 4c and the cylinder portion 6b of the holding cylinder 6. Is formed with a spring receiving portion 20a, the compression spring 7 is externally mounted on the spring holding cylinder 20, the left end of the compression spring 7 is locked by a spring receiving portion 19, and the right end of the compression spring 7 is engaged by the spring receiving portion 20a. It has been stopped.

In this way, the valve body member 3 is elastically biased to the left with respect to the spindle 4, and the valve body member 3 is received by the stop ring 10.

Next, the orifice member 30 mounted between the valve seat 11 and the fluid outlet 9 and other orifice members will be described.
As shown in FIGS. 1 to 3, the orifice member 30 includes an orifice body 31 having an orifice hole 30 a for narrowing the passage area in the valve case 2, and three orifice bodies 30 projecting upstream from the orifice body 31. The orifice member 30 is fixed to the inner end portion of the flow rate lead-out port 9 by being firmly fitted therein.

The three protrusions 32 of the orifice member are formed at three circumferentially equidistant positions, and these three protrusions 32 are respectively arranged between the three ribs 12a. Each projecting portion 32 is arranged at a portion corresponding to the central portion of the arcuate passage 33 between a pair of ribs 12a adjacent to each other in the circumferential direction.

The projecting portion 32 has a circumferential width of about 1/3 of the circumferential width of the arcuate passage 33 and a rectangular plate portion 32a having a wedge-shaped cross section in FIG. 2 and an inner peripheral surface of the rectangular plate portion 32a. It has two protrusions 32b protruding toward the central axis and two protrusions 32b spaced apart in the circumferential direction. The protruding portion 32b projects 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 in a state of partially protruding to the inner peripheral side of the inner peripheral surface of the orifice hole 30a of the orifice body 31, and the two protruding portions 32b are ribs orthogonal to the rectangular plate portion 32a. The rectangular plate portion 32a and the projection 32b are formed in a radial shape and have a radial width of about 2/3 of the arcuate passage 33.
An annular plate-shaped orifice member 34, which is an orifice member 34 having an orifice hole having a diameter larger than that of the orifice member 30, is mounted in the middle of the fluid introduction port 8.

Next, the operation and effect of the flow rate adjusting valve 1 described above will be described.
FIG. 4 shows the measurement results of the noise value of the flow rate adjusting valve, showing the result of housing the flow rate adjusting valve and measuring the water flow noise at a position 1 m away while circulating water. ..
FIG. 4 shows the noise value of the current product (comparative example) and the noise value of the flow rate control valve 1 of the present invention. As shown in FIG. 6, the current product (comparative example) is a flow control valve 1A equipped with a general ring-shaped and flat plate-shaped orifice member 30A. In FIG. 6, the same components as those of the flow rate adjusting valve 1 are designated by the same reference numerals. As can be seen from FIG. 4, the noise value of the flow rate adjusting valve 1 of the present invention is about 2 to 3 dB lower than the noise value of the current type flow rate adjusting valve 1A from a small flow rate to a large flow rate. It can be seen that the sound of water flow is clearly reduced.

FIG. 5 shows the fluid pressure distribution in the vicinity of the flow rate adjusting portion including the valve body and the valve seat of the above-described current flow rate adjusting valve 1A, and shows that the higher the concentration, the higher the pressure. Fluid pressure distributions at positions A, B, C, and D in FIG. 6 are shown in FIGS. 5(a), (b), (c), and (d).
FIG. 7 shows the fluid pressure distribution in the vicinity of the flow rate adjusting portion of the flow rate adjusting valve 1 of the present invention, and shows that the higher the concentration, the higher the pressure. Fluid pressure distributions at positions A, B, C and D in FIG. 8 are shown in FIGS. 7(a), (b), (c) and (d).

Comparing FIG. 5 and FIG. 7, it can be seen that the flow rate adjusting valve 1 of the present invention has a higher overall pressure than the flow rate adjusting valve 1A of the current product. In particular, the pressure of the flow rate control valve 1 of the present invention is obviously high at the position (position B) of the protruding portion 32 of the orifice member 30 and at the downstream side thereof. The fact that the pressure is high during and after passing through the orifice member 30 means that the orifice member 30 is rectified by the rectifying action, resulting in smooth flow with little pressure loss, resulting in reduced water flow noise. It is estimated to be.

Next, the rectifying action of the orifice member 30 will be considered.
The fluid that has passed through the flow rate adjusting portion flows toward the arcuate passage 33 between the three ribs 12a, but in the central portion of the arcuate passage 33, the fluid flow having a high flow velocity is directed toward the upstream side. Since the projecting portion 32 of the orifice member 30 projects, the three projecting portions 32 suppress the circumferential flow and are rectified into the flow in the direction parallel to the central axis of the flow rate adjusting unit and pass through the orifice hole 30a. 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 port 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, so that the flow in the circumferential direction tends to occur. Become stronger. However, the three protrusions 32 of the orifice member 30 suppress the flow in the circumferential direction and rectify the flow as described above, so that 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 flow of the fluid in the circumferential direction is effectively suppressed.

Next, an example in which the above embodiment is partially modified will be described.
1) The number of ribs 12a that connect the support portion 12 to the valve case 2 is not limited to 3, and may be 1 or 4 or more. Similarly, the number of protrusions 32 formed on the orifice member 30 is not limited to three, and may be one or four or more. Further, in the projecting portion 32 of the orifice member 30, the number of the projecting portions 32b formed on the rectangular plate portion 32a is not limited to 2, and may be 1 or 3 or more.

2) In the orifice member 30, the two protrusions 32b may be omitted, and instead, the plate thickness of the upstream half of the rectangular plate 32a may be increased. Further, although the projection 32b is formed only on the upstream half of the rectangular plate 32a, it may be formed over the entire length of the rectangular plate 32a.
3) In addition, those skilled in the art can carry out various modifications to the embodiment without departing from the spirit of the invention, and the invention also includes such modifications. is there.

1 Flow Rate Control Valve 2 Valve Case 3 Valve Body Member 4 Spindle 4f Valve Seat Side Shaft 5 Valve Body 8 Fluid Inlet 9 Fluid Outlet 11 Valve Seat 12 Support 12a Rib 30 Orifice Member 31 Orifice Body 32 Protrusion 32a Rectangle Plate portion 32b Protrusion portion M Drive motor

Claims (4)

A valve case having a fluid inlet port, a fluid outlet port, and a valve seat, and a valve body movable in the valve case, wherein a gap between the valve body and the valve seat is variable. A flow rate adjusting valve for adjusting the flow rate with a flow rate adjusting valve having an orifice member between the valve seat and the fluid outlet,
The orifice member has an orifice body for narrowing the passage area in the valve case, and one or a plurality of protrusions projecting from the orifice body toward the upstream side. .. The valve case is formed in a substantially cylindrical shape, the fluid inlet is orthogonal to the central axis of the valve case, the fluid outlet is formed parallel to the central axis of the valve case, and the valve body is 2. The flow rate adjusting valve according to claim 1, further comprising a drive unit that drives the shaft to move forward and backward in the valve case. On the downstream side of the valve seat, the valve case is provided with a support portion for supporting the valve seat side shaft portion of the valve body, and the support portion is connected to the valve case by a plurality of ribs, and The flow regulating valve according to claim 2, wherein the protrusion is arranged between the plurality of ribs. The flow rate according to claim 3, 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. tuning valve.