JPH10246346A - Rate adjusting valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixed flow rate valve without forming a bypass pipe passage by arranging the fixed flow rate valve in an inner bore formed in a valve body in a flow rate adjusting valve provided with the fixed flow rate valve for flowing liquid at a fixed flow rate into a pipe passage when it is fully closed. SOLUTION: A flow rate adjusting valve arranged in a pipe passage 1 changes a position of a main valve 5 and changes the size of a clearance between a valve seat 4 and it to change a flow rate of hot water which flows in the pipe passage 1. In this case, when the main valve 5 adheres to the valve seat 4 closely and is fully closed, a fixed flow rate valve 20 which introduces a fixed amount of hot water into the pipe passage 1 and is formed into a cylindrical shape with a bottom is provided. This fixed flow rate valve 20 can travel freely together with the main valve 5 due to the travel of a drive rod 8 in the direction of axial line, and there is a flow of hot water which passes through to the downstream side even when the valve 20 is fully closed owing to a flow adjusting hole 20a formed in a side wall part of the fixed flow rate valve 20. The fixed flow rate valve 20 comes to a standstill at a place where a difference in pressure between the upstream side and the downstream side of hot water which flows in the pipe passage 1 is balanced by a compression coil spring 22 for balance.

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 used for adjusting a flow rate of a liquid in, for example, a hot water supply device.

[0002]

2. Description of the Related Art A simple flow control valve arranges a valve seat and a valve body in a pipe through which a liquid flows, and adjusts the flow rate of the liquid flowing through the pipe by controlling the position of the valve body. It has become.

However, in the case of, for example, a hot water supply device, in order to prevent the temperature of the heat exchanger from rising excessively, even when the valve element is fully closed, it is necessary to secure a minimum constant flow rate. A constant flow valve is provided.

[0004] In such a flow control valve provided with a constant flow valve, conventionally, a bypass pipe bypassing a pipe (main pipe) provided with a valve seat and a valve element (main valve) is formed. A constant flow valve is arranged on the way.

[0005]

However, if a structure is adopted in which a bypass line is formed in the middle of the liquid line, there is a drawback that the production thereof is troublesome and the cost is very high.

Accordingly, the present invention provides a flow control valve provided with a constant flow valve for securing a minimum constant flow when the valve element is fully closed, without forming a bypass line. It is an object to provide a flow control valve that can be manufactured at a low cost.

[0007]

In order to achieve the above object, a flow regulating valve according to the present invention is arranged such that a valve seat and a valve body are arranged in a pipe through which a liquid flows, and the position of the valve body is adjusted. By controlling the flow rate of the liquid flowing in the conduit by controlling, the liquid at a constant flow rate when the valve body is moved to a position where there is no gap between the valve seat and the valve seat. In a flow regulating valve provided with a constant flow valve for flowing into a pipe, an inner cavity is formed in the valve body, and the constant flow valve is arranged inside the valve body.

The valve body is formed in a bottomed cylindrical shape,
The constant flow valve may be disposed so as to be axially movably fitted to the inner peripheral surface of the valve element from the upstream side while being urged from the downstream side toward the upstream side.

In this case, a part of the outer peripheral wall surface of the constant flow valve is notched, and the liquid flows into the valve body from the upstream side through the notch portion, and the liquid flows toward the downstream side of the valve body. The outer wall may be notched, and the liquid may flow downstream from the valve body through the notch.

In the flow regulating valve of the present invention, a valve seat and a valve body are arranged in a pipe through which the liquid flows, and the position of the valve body is controlled to control the flow of the liquid flowing in the pipe. Along with adjusting the flow rate, a constant flow valve was provided for flowing the liquid through the conduit at a constant flow rate when in a fully closed state in which the valve body was moved to a position where there was no gap between the valve body and the valve seat. In the flow control valve, the constant flow valve is inscribed in the valve seat when in the fully closed state, and the position is controlled in a state in which the constant flow valve is apart from the valve seat when not in the fully closed state. The constant flow valve is also used as the valve body.

In this case, the constant flow valve may have a part of the outer peripheral wall cut away, and may be disposed so as to be movable in the axial direction while being urged from the downstream side toward the upstream side. .

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a flow control valve according to the first embodiment of the present invention. The flow control valve is disposed at a portion where the pipe line 1 is formed by being bent at substantially a right angle. Reference numeral 2 denotes a pipeline inlet, and reference numeral 3 denotes a pipeline outlet, which is connected, for example, in the middle of a hot water supply pipe of a gas water heater.

Reference numeral 4 denotes a valve seat formed on the inner peripheral surface of the pipeline 1, which is formed in a tapered shape gradually expanding from the upstream side to the downstream side. The main valve 5 is disposed opposite the valve seat 4 from the downstream side.

The main valve 5 is formed with a tapered surface that is in close contact with the valve seat 4. By changing the distance between the main valve 5 and the valve seat 4, the flow rate of hot water flowing through the pipe 1 changes. The position of the main valve 5 is supported by a driving rod 8 and its position is controlled by a reciprocating motor actuator 10 arranged outside the pipeline 1.

9 is to connect the main valve 5 and the like during the assembly to the pipe 1
A cover for closing a hole formed in the pipe line 1 to be disposed in the inside thereof, and a motor actuator 10 just outside the cover.
Are arranged, and the drive rod 8 passes through a hole formed in the center portion of the lid 9. 11 and 12 are O-rings for sealing.

The main valve 5 is formed in a cylindrical shape with a bottom, and is arranged with an open end facing the valve seat 4 side. The drive rod 8 is inserted into a hole formed at the center of the bottom of the main valve 5.
The drive rod 8 passes through the central axis of the main valve 5.

The main valve 5 is a thick and strong compression coil spring 17.
As a result, it is in a state of being constantly pressed against the stop ring 18 locked to the drive rod 8. One end of the compression coil spring 17 is connected to the stop ring 1 locked to the drive rod 8.
The other end of the flange 5 protrudes from the outer peripheral surface of the main valve 5.
b.

Therefore, when the position of the drive rod 8 is changed in the axial direction by the motor actuator 10, the position of the main valve 5 changes accordingly, and the size of the gap between the main valve 5 and the valve seat 4 changes. Then, the flow rate of the hot water flowing in the pipeline 1 changes.

When the main valve 5 comes into close contact with the valve seat 4, the flow rate of the hot water passing through the gap between the two becomes a fully closed state where the drive rod 8 is pushed further. The compression coil spring 17 is compressed so that the main valve 5 and the like are not damaged.

Reference numeral 20 denotes a constant flow valve for flowing a fixed amount of hot water into the pipeline 1 when the main valve 5 comes into close contact with the valve seat 4 and is fully closed. The constant flow valve 20 is formed in a cylindrical shape with a bottom that is one size smaller than the main valve 5, and is arranged with its open end facing the main valve 5. This constant flow valve 20
It is formed to have a thickness that fits into the main valve 5, and usually, a portion that is about half its length is at a position where it fits into the main valve 5.

As with the main valve 5, the constant flow valve 20 has a drive rod 8 fitted in a hole formed at the center of the bottom so as to be able to move forward and backward. The drive rod 8 is biased from the downstream side to the upstream side by the compression coil spring 22 for balancing.
Is pressed against the stop ring 23 locked at the position. 2
Reference numeral 1 denotes a spring receiving plate attached to receive the other end of the balancing compression coil spring 22, and is pressed against the retaining ring 18 from the upstream side.

Therefore, the constant flow valve 20 moves together with the main valve 5 by the movement of the drive rod 8 in the axial direction.
In the normal flow control state shown in FIG.
It does not affect the flow adjustment simply by moving with it.

The distal end portion of the drive rod 8 is loosely fitted and received in a bearing hole 26 formed in the center of the pipe 1, and a plurality of passage holes formed around the bearing hole 26 are provided. Hot water flows in the hole 27.

As shown in FIG. 2, a flow regulating hole 20a is formed in a side wall portion of the constant flow valve 20 which is fitted to the inner peripheral surface of the main valve 5 by notching. The flow regulating hole 20a is formed so as to be wider as it goes toward the inside of the main valve 5 (downstream side). In addition, a communication hole 5a for communicating the inside and outside of the main valve 5 formed in a cylindrical shape is formed in a portion near the bottom of the main valve 5.

Therefore, a small amount of the hot water flowing from the upstream side enters the main valve 5 from the inside of the constant flow valve 20 through the flow regulating hole 20a, and flows into the downstream pipe through the communication hole 5a. Flow to Road 1.

FIG. 1 shows a fully closed state in which the main valve 5 is in close contact with the valve seat 4. In this state, since there is no gap between the valve seat 4 and the main valve 5, the flow rate of hot water in that portion becomes zero.

However, there is a flow of hot water that enters the main valve 5 through the flow control hole 20a formed in the constant flow valve 20 and flows downstream through the communication hole 5a. Therefore, even when the main valve 5 is fully closed, a small amount of hot water always flows.

The constant flow valve 20 is urged from the downstream side to the upstream side by the compression coil spring 22 for balancing, and is movable in the axial direction along the drive rod 8.

Therefore, the constant flow valve 20 stops at a position where the differential pressure between the upstream side and the downstream side of the hot water flowing in the pipeline 1 and the biasing force applied to the constant flow valve 20 are balanced.
As shown in the flow characteristics of Figure 3, the flow rate of hot water flowing through the pipe 1 to the fully opened main valve 5 it is always controlled to a constant flow rate Q _0.

FIG. 4 shows a flow control valve according to a second embodiment of the present invention. In this embodiment, a constant flow valve 20 is fitted into a valve seat 4 formed on the inner peripheral surface of the pipe 1 itself, and is moved in the axial direction by a driving rod 8. . The main valve 5 provided in the first embodiment is omitted, and the constant flow valve 20 also serves as the main valve. The structure for attaching the constant flow valve 20 to the drive rod 8 and the flow regulating holes 20a formed in the side wall of the constant flow valve 20 are the same as those in the first embodiment.

As a result, as shown in FIG. 4, when the constant flow valve 20 is completely removed from the valve seat 4 to the downstream side, the constant flow valve 20 which moves together with the drive rod 8 plays the role of the main valve. As a result, the flow rate is controlled according to the change in the area of the gap between the constant flow valve 20 and the valve seat 4.

Then, as shown in FIG.
In the state in which 0 is fitted into the valve seat 4, a slight constant flow rate Q _{0 is obtained} by the same operation as in the first embodiment.
Hot water flows.

FIG. 6 shows the flow characteristics of the flow control valve according to the second embodiment. In the range where the constant flow valve 20 is fitted to the valve seat 4 (ie, in the fully closed state). As a result, a predetermined constant flow rate Q ₀ is secured in the entire range.

[0034]

According to the present invention, a flow control valve provided with a constant flow valve for securing a minimum constant flow when the valve element is fully closed forms a bypass conduit. It can be manufactured at low cost without any cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a flow control valve according to a first embodiment of the present invention in a fully closed state.

FIG. 2 is a longitudinal sectional view of the flow control valve according to the first embodiment of the present invention in a flow control state.

FIG. 3 is a diagram showing flow rate characteristics according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a flow control valve according to a second embodiment of the present invention in a flow control state.

FIG. 5 is a longitudinal sectional view of a flow control valve according to a second embodiment of the present invention in a fully closed state.

FIG. 6 is a diagram showing flow rate characteristics according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 4 Valve seat 5 Main valve 5a Communication hole 8 Drive rod 20 Constant flow valve 20a Flow regulating hole 22 Balancing compression coil spring

Claims (5)

[Claims] A valve seat and a valve body are arranged in a pipe through which a liquid flows, and the flow rate of the liquid flowing through the pipe is adjusted by controlling a position of the valve body. A flow regulating valve provided with a constant flow valve for flowing the liquid at a constant flow rate in the pipe when the body is moved to a position where there is no gap between the valve seat and the valve seat; Wherein the constant flow valve is disposed in the bore of the valve body. 2. The valve body is formed in a cylindrical shape with a bottom, and the constant flow valve is urged from a downstream side to an upstream side, and is movably axially movable from the upstream side to the valve body. The flow control valve according to claim 1, wherein the flow control valve is arranged so as to be fitted to an inner peripheral surface of the flow control valve. 3. A part of an outer peripheral wall surface of the constant flow valve is notched, and the liquid flows into the valve body from an upstream side through the cutout portion, and a downstream outer wall of the valve body is provided. 3. The liquid is flown from the valve body to the downstream side through the cutout portion.
Flow control valve as described. 4. A valve seat and a valve body are disposed in a pipe through which a liquid flows, and a flow rate of the liquid flowing through the pipe is adjusted by controlling a position of the valve body. A flow regulating valve provided with a constant flow valve for flowing the liquid at a constant flow rate when the body is moved to a position where there is no gap between the valve seat and the valve seat. In the state, the constant flow valve is inscribed in the valve seat, and in a state other than the fully closed state, the position of the constant flow valve is controlled so as to be away from the valve seat, and the constant flow valve is connected to the valve. A flow control valve characterized in that it is also used as a body. 5. The constant flow valve according to claim 4, wherein a part of the outer peripheral wall surface is cut away, and the constant flow valve is axially movable while being urged from the downstream side toward the upstream side. Flow control valve.