JP3096840B2 - Flow control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve.

[0002]

2. Description of the Related Art As shown in FIG. 1, a water heater is usually provided in a can body (K) provided with an exhaust pipe.
(A) and a fan having a built-in burner (B) for heating the same and connecting combustion air to the burner (B) to the can body
(F) and the heat exchanger
The water circuit to (A) is provided with a flow control valve (R) for controlling the tap water temperature or for controlling the temperature of the heat exchanger (A).

FIG. 2 shows a conventional flow control valve (R). In this device, the valve element (1) is configured to face the valve port (24) formed in the flow path in the valve box (2) from the upstream side thereof, and the valve shaft ( 11) The valve box
The output shaft of the servo motor (M) connected to the valve box (2) is passed through
The end of (11) is paired.

When a predetermined signal for controlling the opening of the valve element (1) is input, the output shaft of the servo motor (M) is rotated in response to the input signal, and the screw pair and the corner pair are rotated. By the action, the valve element (1) moves forward and backward, the opening degree with respect to the valve port (24) is adjusted, and the amount of water supplied to the heat exchanger (A) is adjusted. However, in this conventional flow control valve (R), when the opening of the valve element (1) with respect to the valve port (24) is reduced, as shown in FIG. The water flow that has passed through the small gap between the upstream opening edge of (24) and the water flow enters the valve port (24) and expands abruptly, so that a vortex is generated and a running noise is generated. In particular, when the flow path is bent near the valve port (24),
This tendency is remarkable.

[0005] Further, in the case where the heat exchanger (A) built in the can body (K) is connected to the downstream side as described above, the running water noise is transmitted to the can body (K) and amplified. There is a problem that a larger noise is generated.

[0006]

[Technical problem] The present invention has been made in view of the above-mentioned point, and has been made in consideration of a problem that "a valve body (24) provided in a flow path in a valve box (2) is provided with a valve body ( 1) to move forward and backward freely,
The flow rate regulating valve is configured such that the opening of the valve body (1) with respect to the valve port (24) is adjusted within a range from the maximum opening degree to the minimum opening degree by driving the valve body (1) forward and backward by a driving unit. It is another object of the present invention to prevent the running noise from increasing even when the flow rate is reduced.

[0007]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is as follows: "The shaft (1) is connected from the downstream end face of the valve body (1).
0), and the length of the shaft portion (10) is set to a length protruding into the minimum diameter portion of the valve port (24) at the minimum opening of the valve body (1). A diameter-reducing portion in which the diameter of the peripheral wall on the upstream side of the minimum diameter portion at the mouth (24) gradually decreases toward the downstream side.
(23) an annular facing portion of the valve body (1) facing the reduced diameter portion (23) having a shape substantially similar to the reduced diameter portion (23) and having a diameter reduced in the same direction. (13) ".

[0008]

The above technical means of the present invention operates as follows. In this device, when the opening of the valve body (1) with respect to the valve port (24) becomes the minimum opening degree or an opening degree in the vicinity thereof, the shaft part (10) protruding from the downstream end face of the valve body (1) is opened. Protrudes into the smallest diameter part of the mouth (24). Therefore, the inflowing water that has passed through the small gap between the downstream end of the valve element (1) and the valve port (24) travels toward the shaft (10), and is then moved by the shaft (10). The direction is changed smoothly and goes downstream of the valve port (24). Accordingly, the rapid expansion of the flow path cross section in the valve port (24) at the opening degree is greatly reduced, and the change in the direction of the flow of the inflow water in the valve port (24) becomes smooth. And eddy currents are less likely to occur. In the minimum opening state where the flow rate is reduced to the minimum, the reduced diameter portion (23) and the annular facing portion (1
Since the cross section of the flow path formed between step 3 and step 3) is reduced in a stepwise manner over a plurality of steps, generation of water flow noise due to a sudden change in the flow path cross section is prevented. Further, since the pressure of the water flow passing through the gap portion is sequentially reduced over a plurality of stages, the effect of reducing the water pressure drop at the minimum diameter portion is further improved.

[0009]

According to the present invention having the above configuration, the following specific effects are obtained. Even when the opening of the valve element (1) is reduced to the minimum opening, eddy flow is unlikely to occur, so that the inconvenience that the flowing sound becomes loud when the flow is reduced is eliminated.

In a minimum opening state in which the flow rate is reduced to a minimum, the cross section of the flow path formed between the reduced diameter portion (23) and the annular facing portion (13) has a plurality of steps. As a result, the occurrence of water flow noise due to a sudden change in the cross section of the flow path is prevented. As a result, it is possible to more reliably prevent the problem that the running water noise becomes large in the throttled state.

[0011] Even when the heat exchanger accommodated in the can is connected to the downstream side, since the flowing water noise at the flow control valve, which is a source of abnormal noise, is small, the sound is amplified by the entire water heater. The sound of running water is kept sufficiently low.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 4, the flow control valve (R) of this embodiment forms a bent flow path from a lower inlet (21) to a side outlet (22) in a valve box (2). The valve body (1) is housed in a valve chamber flow path (20) formed on the upstream side of the outlet (22). Also, this flow control valve (R) has a can body (K)
It is inserted in the water supply path to the heat exchanger (A) housed in the water.

* Regarding the Structure of Each Part * A valve port (24) is formed in the valve box (2) between the valve chamber flow path (20) and the outlet (22). Is a minimum diameter portion (240) at the downstream end of the step-shaped reduced diameter portion (23) provided on the upstream side portion.
Are made continuous. The reduced diameter portion (23) has an upstream tapered hole portion (23a) formed so as to decrease in diameter toward the downstream side, and a parallel hole portion (23c) following the downstream side.
And a step (23b) continuing downstream of the parallel hole (23c). The reduced diameter portion (23) has an annular facing portion (13) of the valve body (1).
Oppose each other.

The valve body (1) is formed in a cylindrical body, and the annular facing portion (13) formed at the front (downstream) end of the valve body (1) is fixed from the front edge. Auxiliary valve section (1
3a) and a main valve portion (13b) which is continuous with the back of the auxiliary valve portion (13a) and has a larger diameter than the auxiliary valve portion (13a).
The diameter of the main valve (13b) is set slightly smaller than the diameter of the parallel hole (23c), and the diameter of the auxiliary valve (13a) is smaller than the diameter of the peripheral wall of the step (23b). Is also set to a slightly smaller diameter. The axial length of the auxiliary valve portion (13a) is set smaller than the axial length of the step portion (23b).

The rear end of the valve body (1) is connected to a valve chamber flow path (20).
It is slidably accommodated in a synthetic resin holding cylinder (3) inserted and fixed therein, and sliding airtightness with the holding cylinder (3) is secured by an O-ring externally fitted in this housing portion. . The holding cylinder (3) constitutes a valve chamber flow path (20) and has a support ring (31) inserted from an open end of a tubular part (25) located on the opposite side of the outlet (22); The tubular portion (25) is fixed in such a manner as to be pinched between the inner peripheral step portion and the tubular portion (25). The support ring (31) is
It is clamped and fixed between the holding cylinder (3) and a casing (41) of an advance / retreat driving device (4) described below, which is screwed to the open end of the cylindrical portion (25). Further, the O-ring externally fitted to the support ring (31) ensures airtightness with the inner peripheral surface of the cylindrical portion (25).

The forward / backward drive device (4) includes the casing
(41) and a screw body (43) with a pair of screws on this casing (41)
And a servomotor (M) (not shown) having an output shaft (42) fitted with the screw body (43) by fitting such as spline fitting and screwed to the casing (41). ). A shaft body (12) described later penetrates the screw body (43), and the shaft body (12) and the screw body (4
3) are coupled so as to rotate integrally and move integrally in the axial direction.

The shaft (12) penetrates through the support ring (31), loosely penetrates through the inside of the valve (1), and has a shaft (1) at the tip thereof.
0) protrudes forward of the valve body (1). An O-ring is interposed in a penetrating portion of the shaft body (12) in the support ring (31) to ensure mutual sliding airtightness. The front portion of the shaft body (12) is inserted and supported by an annular support wall (14) provided at the front end inside the valve body (1).
A stop ring (16) is fitted on the front side of the support wall (14). A large diameter portion (1) formed in the middle of this shaft body (12)
9) A spring receiver (6) formed of an annular plate is slidably fitted to the front part, and the large diameter part (19) is for preventing the spring receiver (6) from moving backward. A sleeve (7) functioning as a stopper is fitted outside, and its rear end is in contact with the support ring (31). A compression spring (18) is interposed between the spring receiver (6) and the support wall (14). Therefore, the valve body
(1) is maintained in a state of being biased toward the tip end of the shaft body (12).

The valve (1) of the shaft (10) at the tip of the shaft (12)
Is set to a predetermined value, and the main valve portion (1
3b) is inserted into the tapered hole (23a),
(10) reaches the minimum diameter portion (240) of the valve port (24). * About the actual use * The actual use of the flow control valve (R) having the above configuration will be described in detail below.

When a predetermined signal is input to the servo motor (M) and the output shaft (42) is rotated by a predetermined amount, the screw body is rotated by the screw pair and the corner pair according to the degree of rotation of the output shaft (42). The shaft (12) connected to (43) moves forward and backward. FIG.
As shown in the figure, from the state where the valve body (1) is at the maximum opening,
When the shaft body (12) moves forward, the large-diameter portion (19) of the shaft body (12)
As a result, the spring receiver (6) is pushed forward and separates from the sleeve (7) to compress the compression spring (18). As a result, the support wall (14) is pushed and the valve body (1) advances toward the valve port (24).
Conversely, when the shaft body (12) retreats, the support ring (14) is pushed toward the base end side of the shaft body (12) by the retaining ring (16), and the valve body (1) also retreats.

As the valve element (1) advances and retreats, the annular facing portion (1)
The distance (opening of the valve element (1)) between the 3) and the reduced diameter portion (23) is adjusted, and the valve port (24) is introduced from the inlet (21) through the valve chamber flow path (20) according to this distance. ) Varies. Thereby, the amount of water supplied to the heat exchange device (A) is adjusted. When the valve body (1) in the state of FIG. 4 is brought closer to the reduced diameter portion (23) by the operation of the servo motor (M), the opening of the valve body (1) is adjusted as described above, and the amount of water can be adjusted. The main valve portion (13b) comes closest to the minimum diameter portion of the tapered hole portion (23a) due to the advance movement of the valve body (1),
The state in which the auxiliary valve portion (13a) is closest to the inner peripheral edge of the step portion (23b) is a water flow restricting state in which the amount of water is reduced most (the state in FIG. 5).

In this water flow restricting state, as shown in the figure, the shaft (10) at the tip of the shaft (12) is connected to the minimum diameter portion (2) of the valve port (24).
40), the cross-sectional area of the water flow at the minimum diameter portion (240) is reduced. Therefore, the water flowing into the valve port (24) passes through the small gap (242) between the auxiliary valve portion (13a) and the inner peripheral edge of the step (23b), and then reaches the minimum diameter portion (24).
At this time, the direction of the flow is smoothly bent by the shaft portion (10), and the valve port (2) faces the downstream side.
4). Therefore, the rapid expansion of the cross section of the flow path in the minimum diameter portion (240) is greatly reduced, and the minimum diameter portion (2
40) Because the flow direction of the inflow water in the
Eddy currents are less likely to occur. Further, since the cross section of the flow path is not suddenly enlarged, the water pressure at the minimum diameter portion (240) does not suddenly drop.

Moreover, the annular facing portion (13) and the tapered hole portion (23)
a) and a small gap (24) between the auxiliary valve (13a) and the inner peripheral edge of the step (23b).
2), a large gap portion (243) which is sufficiently larger than these small gap portions (241) and (242) is formed. Therefore, since the cross section of the flow path formed between these gaps is reduced in a stepwise manner, generation of water flow noise due to a sudden change in the flow path cross section is prevented. Further, since the pressure of the water flow passing through the gap portion is sequentially reduced over a plurality of stages, the effect of reducing the water pressure at the minimum diameter portion (240) is further improved. In this embodiment, when the upstream side of the valve element (1) is 5 kg / cm ² , the pressure of the large gap (243) is 3 kg / cm ^2.
m ² , the pressure downstream of the auxiliary valve portion (13a) was 0.5 kg / cm ² , and a rapid pressure drop was suppressed.

In this embodiment, the flow path can be shut off by the valve element (1), and when the valve element (1) is further advanced and moved from the minimum opening state where the flow rate is reduced most, the annular facing portion is formed. After (13) is accommodated in the parallel hole (23c), the main valve
(13b) is in contact with the step (23b). In this confronting state, the valve
(1) is in a fully closed state in which the valve port (24) is shut off (state in FIG. 6).

When the screw body (43) is further advanced from the fully closed state, the shaft body (12) is further advanced and the compression spring (1) is further advanced.
8) is further compressed than when the valve element (1) is in the open state. Therefore, the valve closing pressure contact force on the valve seat (23) when the valve element (1) is closed is sufficiently increased. On the other hand, after the annular facing part (13) comes into contact with the step (23b),
Since the shaft body (12) can be further advanced independently of the valve body (1), there is no fear that the impact load at the time of the contact acts on the output shaft (42) and the servomotor (M).

As shown in FIG. 4, the inlet 21 of the valve box 2 moves downstream (upward) when a flow is generated, and is located upstream (lower) in a normal state. Water flow responder
(5) is built in, and a detection device (51) for detecting its movement is provided outside the valve box (2). The water flow responder (5)
Has a built-in ferromagnetic material, and is configured to detect a magnetic force from now on by the detection device (51). The amount of water passing through the valve box (2) is measured by the water flow responsive body (5) and the detecting device (51). That is, the flow control valve (R) of this embodiment is a flow control valve (R) with a water amount detection device.

* Regarding Modifications *. In the above embodiment, the shaft body (12) is configured so that the shaft body (12) is loosely fitted through the valve body (1) formed in the cylindrical body, and the tip end of the shaft body (12) is the shaft portion (10). As shown in FIG. 7, the shaft (10) may be formed integrally with the downstream end surface of the valve body (1). . The forward / backward drive device (4) for adjusting the opening of the valve body (1) is not limited to the above configuration.

[0027] In the above embodiment, in the above-mentioned water flow restricting state, one large gap portion (243) and a small gap portion at both ends thereof between the reduced diameter portion (23) and the annular facing portion (13) opposed thereto. 241)
(242) is formed, but this is changed to a reduced diameter portion (23) and an annular facing portion so that a plurality of large gap portions are formed.
(13) may have a configuration in which a plurality of steps are continuous. . In the above embodiment, the valve port (24) has a configuration in which the reduced diameter portion (23) provided on the upstream side portion and the minimum diameter portion (240) provided on the downstream side portion are continuous, but these are arranged in the axial direction. The configuration may be remote from the main unit. Further, the configuration may be such that the reduced diameter portion (23) is not provided.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a heat exchange device.

FIG. 2 is a sectional view of a conventional flow control valve.

FIG. 3 is an explanatory view of a main part of this.

FIG. 4 is a sectional view of a flow control valve according to an embodiment of the present invention.

FIG. 5 is a sectional view of a main part when the valve element (1) is positioned in a water flow restricting state.

FIG. 6 is a sectional view of a main part when the valve element (1) is positioned in a fully closed state.

FIG. 7 is an explanatory view of a modification.

[Explanation of symbols]

 (2) ・ ・ ・ Valve box (24) ・ ・ ・ Valve (1) ・ ・ ・ Valve (10) ・ ・ ・ Shaft (23) ・ ・ ・ Diameter reduction (13) ・ ・ ・ Circular facing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 1/00-1/54 F16K 47/02

Claims (2)

(57) [Claims] A valve body (1) is movably opposed to a valve port (24) provided in a flow path in a valve box (2) from an upstream side thereof from an upstream side thereof, and the valve body (1) is driven by a driving unit. In the flow control valve, the opening of the valve body (1) with respect to the valve port (24) is adjusted in the range from the maximum opening to the minimum opening by driving the valve back and forth. A shaft (10) is protruded from the end face, and the length of the shaft (10) is adjusted to a length protruding into the minimum diameter portion of the valve port (24) at the minimum opening of the valve body (1). The peripheral wall on the upstream side of the minimum diameter portion in the valve port (24) is a reduced diameter portion (23) whose diameter gradually decreases toward the downstream side,
The facing portion of the valve body (1) facing the reduced diameter portion (23) is an annular facing portion (13) having a shape substantially similar to the reduced diameter portion (23) and a diameter decreasing in the same direction. Flow control valve. 2. The flow regulating valve according to claim 1, wherein a downstream side of the valve port is connected to a heat exchanger of the water heater.