JP3174247B2 - Flow control valve for high temperature fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature fluid flow control valve for controlling the flow of a high-temperature fluid, such as adjusting the supply flow rate of high-temperature air to a gas burner in gas burner combustion control.

[0002]

2. Description of the Related Art Generally, in a rotary type flow control valve for high temperature fluid, a connection between a rotary shaft member of an actuator for rotating a valve body by a rotation angle corresponding to a supply flow rate and a valve body for adjusting the opening of the valve is provided. , As shown in FIG. That is, a cylindrical body 12 forming a part of the rotary shaft member 10 is coaxially fixed to one end of the rotary shaft main body 11, and the valve-side shaft member 7 extended from the valve body main body is fixed to the cylindrical body 12. It is constructed by coaxial spline coupling.

More specifically, the tip of the rotary shaft main body 11 constituting a spline shaft is coaxial with one open end of the cylindrical body 12 having a plurality of spline grooves formed in the inner peripheral surface along the axial direction. , And further screwed into the cylindrical body 12 so as to penetrate a screw member 13 whose axis is oriented in the radial direction of the cylindrical body 12, so that the cylindrical body 12 and the rotating shaft main body 11 are fixed. Have been. Thereby, the rotating shaft main body 11 and the cylindrical body 12 can be integrally rotated.

[0004] One end of the valve-side shaft member 7 also constitutes a spline shaft, and is coaxially inserted into the other open end of the cylindrical body 12. Thereby, the rotating shaft member 10
, The rotational force can be transmitted to the valve element, and the valve element is rotatable in the same direction as the rotary shaft member 10 by the same rotation angle. Thus, when the rotary shaft member 10 rotates by the rotation angle according to the opening degree command supplied from the controller, the valve body rotates in the same direction by the same rotation angle in synchronization, thereby adjusting the opening degree of the valve. Is done.

[0005] One end of the valve-side shaft member 7 is guided by a spline groove of the cylindrical body 12 so as to be relatively movable in the axial direction. In view of the fact that one end of the valve-side shaft member 7 is thermally expanded in the axial direction by the heat of the high-temperature fluid whose flow rate is adjusted, even if one end of the valve-side shaft member 7 extends in the axial direction, This is to prevent the member 7 from coming into contact with the end of the rotating shaft main body 11 to prevent an excessive force from being applied to the rotating shaft member 10.

[0006]

In the above-described conventional flow control valve for a high-temperature flow rate, the valve-side shaft member 7 is designed so that one end of the valve-side shaft member 7 can expand and contract due to thermal expansion caused by the heat of the high-temperature fluid. Although one end of the member 7 and the cylindrical body 12 are spline-coupled, the heat also causes the spline key provided on the valve-side shaft member 7 to expand. For this reason, in order to secure the axial movement of the valve-side shaft member 7, a predetermined play (rack) is also provided between the spline key of the valve-side shaft member 7 and the spline groove of the cylinder 12. There is a problem that it has to be tolerated.

That is, because of the play, the valve body rotates more than the rotation angle of the rotary shaft member by the play, or the opening degree of the valve fluctuates due to the fluid resistance applied to the valve by the play. This causes an overshoot or the like in the flow rate to be adjusted, thereby deteriorating the controllability of the flow rate control. The overshoot due to the play can be alleviated to some extent by setting the sensitivity of the positioner or the like low, that is, by reducing the gain between the control input and output. And there is a problem that a time delay occurs in the flow control that requires a high response.

[0008] The play increases due to wear between the spline groove and the spline key. The present invention has been made in view of the above problems,
It is an object of the present invention to suppress an adverse effect caused by the play while allowing an axial movement of one end of a valve-side shaft member extending from a valve body.

[0009]

To achieve the above object, according to the Invention The high temperature fluid flow control valve described in this onset Ming, adjustment of the opening degree of the valve by the extended by a valve-side shaft member is rotated , And an actuator having a rotation shaft member for appropriately rotating the valve body by a predetermined rotation angle, and one end of a valve-side shaft member extending from the valve body can move only in the axial direction. A high-temperature fluid flow control valve spline-connected to one end of the rotary shaft member, wherein the valve side interposed between one end side of the valve-side shaft member and one end side of the rotary shaft member. A biasing means is provided for relatively biasing one end of the valve-side shaft member in the rotational direction by obtaining a reaction force on the rotary shaft member while allowing relative movement of one end of the shaft member in the axial direction. It is characterized by that.

In the present invention, the one end of the valve-side shaft member is relatively urged in the rotational direction by the urging means, so that the spline key provided at one end of the valve-side shaft member is provided. One surface facing in the circumferential direction is always in contact with the opposing surface of the spline groove of the rotary shaft member with a predetermined pressing force. As a result, there is no play in the rotating direction between the one end of the valve-side shaft member and the cylindrical body, and the valve-side shaft member can rotate integrally with the rotary shaft member in the same direction and at the same rotation angle. Becomes

The urging means is provided between the one end of the valve-side shaft member and the tip of the rotary shaft member while allowing one end of the valve-side shaft member to move in the axial direction. Since it is interposed, expansion and contraction of the valve-side shaft member in the axial direction due to heat change is allowed, and it is prevented that an excessive force is applied to the rotary shaft member side as in the related art. Furthermore, the present invention is, biasing means on SL is a spring member fixed to the rotating shaft member and the other end to one end portion on the valve body side with twisted state toward the circumferential direction of the valve-side shaft member It is characterized by having.

With this configuration , the spline key of the valve-side shaft member is constantly pressed relatively to the spline groove of the cylinder by obtaining a reaction force on the cylinder by the elastic force of the spring member. Further, since the spring member is disposed in a state of being twisted in the circumferential direction of the valve-side shaft member, it can be elastically deformed also in the axial direction of the valve-side shaft member. Therefore, expansion and contraction of one end of the valve-side shaft member in the axial direction is allowed . As a result, the same effect as described above is obtained .

[0013]

Embodiments of the present invention will be described with reference to the drawings. High-temperature fluid flow control valve 1 of the present embodiment
For example, as shown in FIG. 1, the valve body 2 is inserted in the middle of a pipe 3 for supplying a high-temperature fluid such as high-temperature air, and the valve is opened according to an opening command from the controller 4. Adjust the flow rate by adjusting the degree.

Here, in FIG. 1, reference numeral 5 denotes a flow meter for measuring the flow rate flowing through the pipeline 3, and reference numeral 6 denotes a high-temperature fluid use facility such as a gas furnace that uses the supplied high-temperature fluid. Is shown. The basic configuration of the high-temperature fluid flow control valve 1 of the present embodiment is the same as the conventional high-temperature fluid flow control valve, and as described above, the valve body 2 inserted into the pipe 3 and the valve A valve body for adjusting the degree, and an actuator 8 for rotating a valve-side shaft member 7 extended from the valve body. The controller 4 controls the actuator 8 based on a detection signal from a positioner 9 or the like. A positioning signal is supplied, and feedback control of the rotation angle of the actuator 8 is performed.

A rotary shaft member 10 of the actuator 8 which rotates by a predetermined rotation angle in response to a signal from the controller 4, and a valve-side shaft member 7 extending from the valve body.
2 is substantially the same as the conventional structure, as shown in FIG. More specifically, the rotating shaft member 10 includes a rotating shaft main body 11 and a cylinder 12 that is spline-coupled to the rotating shaft main body 11. A plurality of spline keys are formed on the outer peripheral surface of one end 11a of the rotary shaft body 11. A plurality of spline grooves are formed on the inner peripheral surface of the cylindrical body 12 along the axial direction. The rotating shaft main body 11 is coaxially inserted into one opening end of the cylindrical body 12. Further, a screw member 13 is screwed into the cylindrical body 12 so as to penetrate in the radial direction of the cylindrical body 12, and the distal end of the screw member 13 is pressed against the outer peripheral surface of the one end 11 a of the rotating shaft main body 11, whereby The cylindrical body 12 and the rotary shaft main body 11 are directly connected, and the rotary shaft main body 11 and the cylindrical body 12 are integrally rotatable.

A spline key is also formed on the outer periphery of one end 7b of the valve-side shaft member 7, and one end of the valve-side shaft member 7 also constitutes a spline shaft. One end 7b of the valve-side shaft member 7 is coaxially inserted into the other open end of the cylindrical body 12. Thereby, the cylindrical body 12
, The rotational force can be transmitted to the valve side shaft member 7 side, and the valve side shaft member 7 is rotatable in the same direction as the rotary shaft member 10 by the same rotation angle, and is allowed to move in the axial direction. Have been. The valve-side shaft member 7 is provided with a through hole 7a penetrating in the radial direction.

Further, a spring member 14 is interposed between the valve-side shaft member 7 and a central portion of the cylindrical body 12 in the axial direction.
The spring member 14 is made of a linear spring steel. Then, the one end portion 14a of the linear spring member 14 is penetrated into a through hole 7a formed in the valve side shaft member 7 and hooked, so that the one end portion 14a of the spring member 14 becomes a valve side shaft member. 7 side.

Further, the spring member 14 is bent in a substantially S-shape by being twisted in the circumferential direction of the valve-side shaft member 7, and the other end 14b is connected to the cylindrical body via the screw member 15. 12 is fixed to the center. As a result, the spring member 14 obtains a reaction force from the tubular body 12 and constantly urges the valve-side shaft member 7 relatively in the rotation direction. By this biasing force, one surface of the spline key provided on the valve side shaft member 7 facing in the circumferential direction is always in contact with the opposing spline groove of the cylinder 12 with a predetermined pressing force. I have. That is, there is no play (rack) between the surface of the spline key provided on the valve side shaft member 7 facing the circumferential direction and the spline groove of the cylindrical body 12 facing the spline key.

Next, the flow control valve 1 for high temperature fluid having the above configuration
The operation and the like will be described. The controller 4 supplies a positioning signal corresponding to a position detection signal or the like from the positioner 9 to the actuator 8, and the actuator 8 drives the rotation shaft member 10 to rotate by a rotation angle corresponding to the positioning signal. When the rotation shaft member 10 of the actuator 8 rotates by a predetermined rotation angle, a rotation force is transmitted from the cylindrical body 12 which is a part of the rotation shaft member 10 to the valve side shaft member 7, and the valve side shaft member 7 is synchronized. And rotate by the same rotation angle. This is appropriately performed according to the flow rate to be supplied, and the opening degree of the valve is appropriately adjusted.

At this time, when the rotating shaft member 10 rotates in the direction opposite to the biasing direction of the spring member 14, the surface of the spline groove of the cylindrical body 12 contacted by the biasing force of the spring member 14 and the valve. Since the rotational force is transmitted through the side surface of the side shaft member 7 with the spline key, the valve side shaft member 7
It rotates together with the rotating shaft member 10 in the same direction by the same angle without play. Further, even if the rotation of the rotary shaft member 10 is stopped, the valve-side shaft member 7 is urged by the spring member 14, so that the valve-side shaft member 7 is prevented from swinging in the opposite direction to the above-described urging direction. You. That is, the valve-side shaft member 7 is prevented from rotating by an amount corresponding to the play between the spline groove of the cylindrical body 12 and the spline key of the valve-side shaft member 7. In addition, the urging force of the spring member 14 also suppresses the valve body and the valve-side shaft member 7 from swinging by the play due to the torque due to the fluid resistance applied to the valve.

The rotating shaft member 10 is connected to the spring member 14.
In the case of rotation in the same direction as the urging direction by the rotating shaft member 10, the rotating force of the rotating shaft member 10 causes the surface of the spline groove of the cylindrical body 12 in contact with one side of the spline key of the valve-side shaft member 7 to temporarily move. When the rotation shaft member 10 stops rotating, the surface of the spline groove of the cylindrical body 12 and the one side of the spline key of the valve-side shaft member 7 are again separated by the urging force of the spring member 14. And abut. by this,
Certainly, the valve-side shaft member 7 also rotates in the same direction by the same rotation angle as the rotation angle of the rotation shaft member 10. Further, when the rotation of the rotary shaft member 10 is stopped, similarly to the above, the urging force of the spring member 14 causes the valve-side shaft member 7 to rotate.
Is prevented from swinging in the direction opposite to the biasing direction. That is, the valve-side shaft member 7 is prevented from rotating by an amount corresponding to the play between the spline groove of the cylindrical body 12 and the spline key of the valve-side shaft member 7. In addition, the valve body and the valve-side shaft member 7 are moved by the play due to the torque caused by the fluid resistance acting on the valve.
It is also suppressed that swings.

Thus, the valve body surely rotates by the same rotation angle in the same direction as the rotation of the rotary shaft member 10, so that the valve body between the valve-side shaft member 7 and the rotary shaft member 10 is different from the conventional one. The occurrence of adverse effects such as overshoot of the supply flow rate due to play can be prevented, thereby improving the controllability of the flow rate control. Further, since the spring member 14 is bent in a substantially S-shape, the spring member 14 is also elastically deformable in the axial direction of the valve-side shaft member 7. As a result, when one end of the valve-side shaft member 7 expands and contracts in the axial direction due to thermal expansion due to the heat of the high-temperature fluid, the spring member 14 also bends in the axial direction of the valve-side shaft member 7 and the one end of the valve-side shaft member 7 Allows movement in the axial direction. At this time, the elastic force corresponding to the bending by the spring member 14 is input to the rotating shaft member 10 side, but there is no problem if the elastic force of the spring member 14 in the axial direction is set to be weak.

In the above embodiment, the valve-side shaft member 7
This is an example in which a spring member 14 is provided between the spring member 14 and the cylindrical body 12 .
Although outside the scope of the present invention, for example, as shown in FIG.
It is conceivable to interpose a spring member 14 that can bend in the axial direction and the circumferential direction of the valve-side shaft member 7 between the spline key 7c of the valve-side shaft member 7 and the spline groove 12a of the cylindrical body 12.
You . However, the spring member 14 of the above embodiment has better attachment.

In the above embodiment, the cylindrical body 12 is fixed to the rotary shaft main body 11 and the cylindrical body 12 is fixed to the rotary shaft member 10.
However, the present invention is not limited to this. For example, the cylinder 12 is fixed to the valve-side shaft member 7, and the cylinder 12 is a part of the valve-side shaft member 7, and the rotary shaft body 11 is spline-coupled to the cylinder 12 so as to be movable in the axial direction. Is also good. In this case, a spring member 14 is interposed between the cylinder 12 constituting the valve-side shaft member 7 and the rotary shaft main body 11.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Actually, a flow control valve 1 in which a high temperature air is used as a high temperature fluid and a spring member 14 is provided as in the above-described embodiment, and a flow control valve 1 in a case where a spring member 14 is not provided as in the prior art. When the actual air flow rate after passing through was measured, the results shown in FIGS. 4 and 5 were obtained (curve A shows the flow rate value).

FIG. 4 shows a flow control valve 1 provided with the above-mentioned spring member 14 in the present embodiment, and FIG. 5 shows a case where the spring member 14 is not provided for comparison. In the figure, B indicates a valve opening command value for the flow control valve 1. As can be seen from FIGS. 4 and 5, when the spring member 14 was not provided, a portion where the controlled flow rate temporarily overshot (C portion in FIG. 5) occurred. It can be seen that the flow control valve 1 according to the above-described embodiment has no adverse effect such as overshoot and the flow is controlled to a flow almost proportional to the input opening command value.

[0027]

As described above, in the flow rate adjusting valve for high temperature fluid of the present invention, by providing the urging means, the expansion and contraction due to the thermal expansion of the valve side shaft member of the valve body is allowed while the valve side is expanded. This has the effect of preventing adverse effects such as overshoot of the supply flow rate, which have conventionally occurred due to play (rack) between the shaft member and the rotary shaft member, thereby improving the flow control performance.

Further, when the present invention is adopted, there is an effect that the thermal expansion of the valve-side shaft member can be made tolerable while easily preventing the adverse effect of the play by merely attaching the twisted spring member. .

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an arrangement of a high-temperature fluid flow control valve according to an embodiment of the present invention.

FIG. 2 is a view showing a connection state between a valve-side shaft member and a rotary shaft member according to the embodiment of the present invention.

FIG. 3 is a diagram showing another example of a spring member according to the embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between a valve opening command value and an adjusted flow rate at the time of execution of an example according to the embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a valve opening command value of a conventional flow rate adjusting valve and a flow rate at the time of the adjusted execution.

FIG. 6 is a view showing a connection state between a valve-side shaft member and a rotary shaft member in a conventional high-temperature fluid flow control valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-temperature fluid flow control valve 7 Valve side shaft member 8 Actuator 10 Rotary shaft member 11 Rotary shaft main body 12 Cylindrical body 14 Spring member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-17944 (JP, A) JP-A-4-285368 (JP, A) JP-A-61-191681 (JP, U) JP-A-6-91681 56570 (JP, U) Fully open Showa 60-93073 (JP, U) Fully open Showa 54-57244 (JP, U) Fully open Showa 54, 137643 (JP, U) Fully open, 5-86753 (JP, U) Japanese Patent Publication No. 41-12682 (JP, B1) Japanese Patent Publication No. 60-24327 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/44-31/62 F16K 1/16 -1/226 F16C 3/00

Claims (1)

(57) [Claims] 1. A valve body for adjusting an opening degree of a valve by rotating an extended valve-side shaft member, and an actuator having a rotation shaft member for appropriately rotating the valve body by a predetermined rotation angle. A high-temperature fluid flow control valve, wherein one end of a valve-side shaft member extending from the valve body is spline-connected to one end of the rotary shaft member so as to be movable only in the axial direction; A reaction force is applied to the rotary shaft member while being interposed between one end of the member and one end of the rotary shaft member and allowing relative movement of one end of the valve-side shaft member in the axial direction. Biasing means for relatively biasing one end of the valve-side shaft member in the rotational direction, and the biasing means is provided in the circumferential direction of the valve-side shaft member.
Rotate one end toward the valve body with the other end twisted toward
A high-temperature fluid flow control valve, being a spring member fixed to a shaft member .