JPH0611064A - Control valve - Google Patents

Abstract

PURPOSE:To generate desired closely contacting force between a plug and a valve set simultaneously with bringing the plug inclose contact with the valve seat. CONSTITUTION:A conversion means 116 to convert attracting force applied on the actuating shaft 112 of a solenoid 113 to displacement of a valve stem, is constituted of a vertical shaft 120 which is up and down movably held with a york 111 and connected to the upper end of a valve stem 115 at its lower end, a downward engaging member 121 which is fixed to the upper end of the vertical shaft 120 and engaged with an upward engaging member 130 fixed to the actuating shaft 112 of the solenoid 113 from the above side, and a compression spring 122 to downward energize the vertical shaft 120.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve, and more particularly, to a control valve used for controlling the flow rate of each fluid when mixing several kinds of fluids at a predetermined ratio.

[0002]

2. Description of the Related Art As a conventional control valve, for example, as disclosed in Japanese Utility Model Laid-Open No. 56-161306, there is a downward operating shaft that is moved in the lengthwise direction by a suction force, and an input current is applied. Pull-type solenoid that operates so that the magnitude of the suction force is proportional to the size of the valve, a valve body with an upward valve seat, and a valve stem that is held vertically movable on the valve body. , Which is composed of a plug provided at the lower end of the valve stem and brought into close contact with the valve seat from above, and a compression spring that urges the valve stem downward, and the operating shaft and valve stem are integrated It has been known.

[0003]

In the above control valve, the suction force of the solenoid is gradually reduced, whereby the valve stem is moved downward by the spring force of the compression spring and the plug is brought into close contact with the valve seat. As a result, the control valve is closed. Immediately after the plug is brought into close contact with the valve seat,
The attraction force and the spring force are balanced, and the contact force between the plug and the valve seat is equal to zero, and then the attraction force due to the spring force increases as the attraction force further decreases. Therefore, after the plug comes into close contact with the valve seat, it takes time until the close contact force between the plug and the valve seat reaches a required magnitude.

An object of the present invention is to solve the above problems,
The object is to provide a control valve that allows the plug to come into close contact with the valve seat while at the same time producing the desired close contact force between the plug and the valve seat.

[0005]

SUMMARY OF THE INVENTION A control valve according to the present invention comprises a vertical bottomed cylindrical yoke and a downward actuating shaft mounted on the upper end of the yoke and moved in the longitudinal direction by a suction force. It has a suction force proportional to the magnitude of the input current, and when it is not energized, it projects the working shaft downward into the yoke, but when energized, the suction force moves the working shaft upward. A pull-type solenoid that operates to move, a valve body that is connected to the bottom wall of the yoke and has an upward valve seat, and a valve body that is held movably up and down on the valve body. A valve stem that protrudes further upward and enters the yoke, a plug that is provided at the lower end of the valve stem and that closely contacts the valve seat from above, and acts on the operating shaft that is housed in the yoke. The suction force to In a control valve including a conversion means for converting to a displacement of a stem, the conversion means is fixed to a vertical shaft that is vertically movable in a yoke and is connected to the upper end of a valve stem at the lower end, and to the upper end of the vertical shaft. A downward engaging member that engages from above with an upward engaging member that is fixed to the lower end of the operating shaft of the solenoid, and a compression spring that urges the vertical shaft downward. It is a thing.

[0006]

In the control valve according to the present invention, the converting means is vertically held by the yoke so as to be movable up and down, and the lower end is connected to the upper end of the valve stem. The vertical shaft is fixed to the upper end of the vertical shaft and the solenoid is operated. Since the downward engaging member that engages from the upper side with the upward engaging member fixed to the lower end of the shaft and the compression spring that urges the vertical shaft downward, the attraction force of the solenoid is gradually reduced. By doing so, the spring force of the compression spring causes both of them to move downward together with the valve stem with the operating shaft and the vertical shaft engaged,
When the plug is brought into close contact with the valve seat, the control valve is closed, and when the plug is brought into close contact with the valve seat, the valve stem does not move but only the operating shaft moves. The valve stem is urged downward only by the force of the spring without being affected by the suction force of the shaft.

[0007]

Embodiments of the invention are described by way of example only with reference to the drawings.

The control valve, as shown in FIGS. 1 and 2,
It is mounted on the vertical bottomed cylindrical yoke (111) and the upper end of the yoke (111), and the attraction force is proportional to the magnitude of the input current. Solenoid (11) with downward actuating shaft (112)
3) and a valve connected to the bottom wall of the yoke (111).
Body (114) and valve stem (115) held up and down in the valve body (114) and with the top protruding above the valve body (114) and into the yoke (111). And the actuating shaft (11
And 2) converting means (116) for converting the suction force acting on (2) into the displacement of the valve stem (115).

The solenoid (113) is of a pull type, and when not energized, the actuating shaft (112) is projected downward from the mounting surface (117) to be inserted into the yoke (111). However, when energized, the suction force acts so as to move the actuating shaft (112) upward. At the lower end of the valve stem (115) is an inverted conical plug with needle (118),
This is in close contact with the upper edge of the inner surface of the seat ring (119).

The conversion means (116) is vertically held by the yoke (111) and has a vertical shaft (120) having a lower end to which the upper end of a valve stem (115) is fixed and a vertical shaft (120). ) Fixed to the upper end of the solenoid (113) and connected to the lower end of the actuating shaft (112) of the solenoid (113) so as to move with the upward movement of the actuating shaft (112), and the vertical shaft (120). ) Is urged downwardly, the compression spring (122) is provided.

The partition wall (123) of the yoke (111) has a vertical axis (12
There is a through hole (124) in which the (0) is fitted. Partition
A screw on the vertical axis (120) below (123) to the lower edge of the outer surface.
(125) is provided. The engagement member (121) has a top wall (12) through which the lower end of the operating shaft (112) of the solenoid (113) penetrates.
6) and a cylindrical female screw member (129) having a bottom wall (128) and screwed onto the male screw member (127). Actuating Axis (112) of Solenoid (113)
The lower end of the engaging member is engaged with the top wall (128) from below.
(130) is secured by nuts (131). Bottom wall (12
A threaded portion (132) is provided on the downward protruding portion 8) and is screwed into a screw hole (133) formed at the upper end of the vertical shaft (120). In addition, the male thread (132) has a vertical axis (120).
A lock nut (134) is tightened at the top of the.

The characteristics of the solenoid (3) will now be described in detail with reference to FIGS.

FIG. 6 shows a system for measuring the characteristics of the solenoid (3), in which a controller (51) is connected to the main body of the solenoid (3) and an operating shaft (2) of the solenoid (3) is connected.
A spring (52) and a displacement gauge (53) are connected to each. When a voltage signal is input to the controller (51) with a potentiometer, not shown, etc., the controller (51)
Outputs a current according to the input voltage. This current is input to the solenoid (3) to generate a magnetic attraction force in the solenoid (3), and the magnitude of the attraction force is proportional to the input current as described above. The relationship is shown in FIGS. Fig. 3 shows the suction force characteristics. The stroke (mm) on the horizontal axis and the horizontal suction force (kg) on the vertical axis.
6 is a graph showing the relationship of (f) in the relationship of the magnitude of the current (A) flowing through the solenoid (3). FIG. 4 is a graph showing the displacement characteristic and is a graph showing the relationship between the input signal (V) on the horizontal axis and the displacement (mm) on the vertical axis. Furthermore, FIG.
In the figure, the relationship between the time (S) showing the step response and the displacement (mm) is shown.

When the solenoid (113) is not energized, as shown in FIG.
The plug (118) to the seat ring (119)
Close to and closes the gap between the inlet (113) and the outlet (136). In this state, when the solenoid (113) is energized, a magnetic attraction force is generated in the solenoid (113) that moves its operating shaft (112) upward. When this suction force is gradually increased, the actuation shaft is resisted against the compression spring (122).
The (112) moves upward, and the vertical shaft (120) is pulled up via both the engaging members (121) (130). As a result, the valve stem (115) connected to the vertical axis (120) is plugged.
Ascend with the (118) so that the plug (118) engages the seat ring (1
19) away from the inlet (135) and outlet (136)
Are communicated.

From this state, when the suction force of the solenoid (113) is gradually reduced, the compression shaft (122) engages the actuating shaft (112) and the vertical shaft (120) to both actuate the valve stem. It is moved downward with (115).
When the plug (118) is brought into close contact with the seat ring (119), the flow between the inlet (135) and the outlet (136) is cut off. Seat ring (119) with plug (118)
The vertical shaft (120) and the valve stem (115) do not descend after they are brought into close contact with each other, but only the actuating shaft (112) descends so that the engagement between the engaging members (121) (130) is reduced. It will be canceled. Then, the vertical shaft (120) is disconnected from the working shaft (112) and is not affected by the suction force of the working shaft (112), and the valve stem (115) is the spring of the compression spring (122). The seat ring (119) is brought into close contact only by force.

[0016]

According to the present invention, by gradually reducing the attraction force of the solenoid, both of them move downward together with the valve stem by the spring force of the compression spring with the operating shaft and the vertical shaft engaged. When the plug is brought into close contact with the valve seat, the control valve is closed, and when the plug is brought into close contact with the valve seat, the valve stem does not move but only the actuating shaft moves, so the two are disengaged. The valve stem is biased downward only by the force of the spring without being affected by the suction force of the operating shaft, so that the plug comes into close contact with the valve seat and, at the same time, the desired close contact force is obtained between the plug and the valve seat. Can be generated.

[Brief description of drawings]

1 is a vertical longitudinal sectional view of a control valve according to the present invention.

FIG. 2 is a side view of the control valve.

FIG. 3 is a graph showing a characteristic of a stroke and a suction force of a solenoid used for the control valve.

FIG. 4 is a graph showing characteristics of input voltage and displacement of the solenoid.

FIG. 5 is a graph showing characteristics of time and displacement of the solenoid.

FIG. 6 is an explanatory diagram showing a system for measuring characteristics of the solenoid.

[Explanation of symbols]

 111 Yoke 112 Actuating shaft 113 Solenoid 114 Valve body 115 Valve stem 116 Conversion means 118 Plug 119 Valve seat 120 Vertical shaft 121 Engaging member 122 Spring 130 Engaging member

Claims (1)

[Claims] 1. A vertical bottomed cylindrical yoke (111) and a downward working shaft (112) attached to the upper end of the yoke (111) and moved in the longitudinal direction by suction force. ,
The magnitude of the attracting force is proportional to the magnitude of the input current, and the working shaft (112) is projected downward into the yoke (111) when not energized. (11
2) A pull-type solenoid (113) that actuates to move upwards, and an upward valve seat (119) connected to the bottom wall of the yoke (111).
A valve body (114) having a valve body (114) and a valve body (114) that is vertically movable and has an upper portion that protrudes above the valve body (114).
11) The valve stem (115) that is inside the valve stem (115) and the valve seat (119) that is provided at the lower end of the valve stem (115).
A plug (118) that is in close contact with the upper side of the valve, and a conversion means (116) that converts the suction force that is contained in the yoke (111) and that acts on the operating shaft (112) into the displacement of the valve stem (115). A vertical shaft (120) in which the conversion means (116) is vertically movably held by the yoke (111) and the upper end of the valve stem (115) is connected to the lower end of the control valve.
Fixed to the upper end of the vertical axis (120) and solenoid (11
3) Upward engaging member fixed to the lower end of the operating shaft (112)
A control valve comprising: a downward engaging member (121) that engages with (130) from the upper side; and a compression spring (122) that urges the vertical shaft (120) downward.