JP3825569B2 - Control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control valve such as an electric control valve, and more particularly to a control valve having a valve body that is guided by a guide member and moves in the axial direction of the guide member.
[0002]
[Prior art]
As a control valve such as an electric control valve used in refrigeration and cooling equipment, it is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member, and guided to the guide member. A control valve having a valve body that moves in the axial direction to open and close a valve port is known, and this type of control valve is disclosed in, for example, Japanese Patent Laid-Open No. 10-2450.
[0003]
[Problems to be solved by the invention]
In the control valve as described above, the inner diameter of the valve body support hole is slightly larger than the outer diameter of the valve body so that the valve body can move in the axial direction of the guide member, and between the guide member and the valve body. It is necessary to provide a required clearance, and the valve body can move in the lateral direction (radial direction) with respect to the guide member by the clearance.
[0004]
For this reason, there is a problem that the valve body vibrates in the lateral direction by receiving a force from a high-speed fluid and generates a vibration sound particularly in a minute valve opening state. For this reason, in order to prevent the generation of vibration noise, the flow control must be performed by a control program that avoids vibration in the minute valve opening state, which affects the flow control accuracy.
[0005]
The present invention has been made to solve the above-mentioned problems, and has been improved so as to appropriately regulate the lateral movement of the valve body regardless of opening and closing of the valve port and to prevent generation of vibration noise. The purpose is to provide a control valve.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a control valve according to the invention described in claim 1 is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member. In a control valve having a valve body that is guided by a guide member and moves in the axial direction to open and close the valve port, the valve body is arranged in a mode that allows movement in the axial direction relative to the guide member. A roll prevention mechanism is incorporated that biases in the direction and presses the outer peripheral surface portion of the valve body against the inner peripheral surface portion of the valve body support hole.
[0007]
In the control valve according to the first aspect of the present invention, the roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and is pressed against the outer peripheral surface of the valve body; The spring is configured to urge the child toward the outer peripheral surface of the valve body.
[0008]
In the control valve according to the first aspect of the present invention, the pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is hooked on the outer peripheral surface of the guide member. And a flexible arc spring that contacts the steel ball from the outside of the guide member.
Furthermore, in the control valve according to the first aspect of the present invention, the steel ball is engaged with a key groove-like vertical groove formed on the outer peripheral surface of the valve body and extending in the axial direction, whereby the key The relative movement of the guide member in the circumferential direction with respect to the through hole of the groove is restricted.
[0009]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction by the roll prevention mechanism, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole. .
[0010]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction of the guide member by the spring via the pressing member, and the outer peripheral surface portion of the valve body is urged by the urging force. It is pressed against the inner peripheral surface of the support hole.
[0011]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction of the guide member by the arc-shaped spring through the steel ball, and the portion of the outer peripheral surface of the valve body is urged by this urging force. The steel ball rolls in the through hole of the guide member when it is pressed against the inner peripheral surface of the body support hole and the valve body moves in the axial direction of the guide member.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0013]
1 to 3 show an embodiment in which the control valve according to the present invention is applied to an electric control valve.
[0014]
The electric control valve has a valve housing 1, and an inlet port 3, a valve chamber 5, a valve seat portion 7, a valve port 9, and an outlet port 11 are formed in the valve housing 1.
[0015]
A cylindrical guide member 13 is fixed to the valve housing 1, and the guide member 13 defines a valve body support hole 15 that is a through hole. In other words, the valve body support hole 15 is formed by the guide member 13 and extends vertically through the figure, and the cylindrical stem portion 19 of the valve body 17 is inserted into the valve body support hole 15 in the axial direction (vertical direction). ) Is movably fitted.
[0016]
The inner diameter of the valve body support hole 15 is set to be slightly larger than the outer diameter of the cylindrical stem portion 19 so that the valve body 17 can move in the axial direction, and the guide member 13 and the cylindrical stem portion 19 The required clearance is provided between them.
[0017]
The valve body 17 is guided by the guide member 13 and moves in the axial direction. The valve body 17 is selectively seated on the valve seat portion 7 by the conical valve portion 20 provided on the distal end side of the valve body support hole 15. Open and close.
[0018]
A stepping motor 23 is attached to the valve housing 1 by a mount member 21. The stepping motor 23 includes a cap-like cover 25 fixed to the mount member 21, a stator coil 27 fixed to the outside of the cover 25, and a rotor 29 provided in the cover 25 so as to move up and down and rotate. is doing. The rotor 29 is constituted by an assembly of a cylindrical permanent magnet 31 and a rotor main body 33, and rotates by electromagnetic action with the stator coil 27.
[0019]
An upper end portion of a connecting rod 35 is connected to the rotor body 33 so as to be rotatable but cannot move in the axial direction, and a lower end portion of the connecting rod 35 is connected to the cylindrical stem portion 19 of the valve body 17. For a more detailed structure of this connection structure, refer to Japanese Patent Laid-Open No. 10-2450 as necessary.
[0020]
A sleeve-shaped female screw member 39 is fixed to the upper portion of the guide member 13, and a lower end portion of a cylindrical male screw member 37 is screwed to the female screw member 39. The connecting rod 35 is inserted. A female screw member 29A fixed to the rotor 29 is screwed onto the male screw member 37. As a result, when the rotor 29 rotates, the female screw member 29A is screwed with respect to the male screw member 37, and the rotor is rotated. 29 moves up and down together with the connecting rod 35, and the valve body 17 moves up and down (moves in the axial direction) by the up and down movement of the connecting rod 35.
[0021]
A pin 41 is fixed to the upper portion of the rotor 29, and a fixing rod 43 is fixed in the cover 25 in a manner that it is suspended from the ceiling. A spiral guide member 45 is attached to the outer periphery of the fixed rod 43, and a movable stopper piece 47 is engaged with the spiral guide member 45.
[0022]
The movable stopper piece 47 is kicked by the pin 41 by the rotation of the rotor 29, spirally moved by being guided by the spiral guide member 45, and brought into contact with the stopper portion 48 on the upper end side, whereby the upper limit position of the valve body 17, that is, the fully open position. Is specified. For more detailed configuration of the stopper structure, refer to Japanese Patent Laid-Open No. 10-2450 as necessary.
[0023]
As a rolling prevention mechanism for the valve body 17, a steel ball 51 as a presser is movably inserted into a through hole 49 formed in the guide member 13, and is formed on the outer periphery of the guide member 13 including the through hole 49. A C-ring spring 55 is engaged with the circumferential groove 53.
[0024]
The C-ring spring 55 surrounds the guide member 13 and comes into contact with the back side of the steel ball 51, and biases the steel ball 51 toward the radially inner side, that is, toward the outer peripheral surface of the valve element 17. The steel ball 51 is urged rightward in the drawing by the spring force of the C ring spring 55 and is engaged with a key groove-like vertical groove 57 formed on the outer peripheral surface of the valve body 17.
[0025]
As a result, the outer peripheral surface portion (right outer peripheral surface portion in the figure) of the valve body 17, particularly the cylindrical stem portion 19, is pressed against the inner peripheral surface portion (right inner peripheral surface portion in the figure) of the valve body support hole 15. ing.
[0026]
As described above, the outer peripheral surface portion of the valve body 17 is pressed against the inner peripheral surface portion of the valve body support hole 15, so that the valve body 17 is given a preload in the radial direction of the guide member 13. . As a result, the movement of the valve body 17 in the radial direction of the guide member 13 is appropriately regulated, and even if the valve body 17 receives a force due to a high-speed unsteady flow in the minute valve opening state, the guide member 13 Generation of vibration noise is avoided without vibration in the radial direction.
Thereby, the control in the minute valve opening state becomes possible, and the valve opening control accuracy is improved.
[0027]
When the valve body 17 moves up and down, the steel ball 51 rolls in a state of being engaged with the longitudinal groove 57, so that the increase in sliding resistance of the valve opening and closing by the roll prevention mechanism is suppressed to a small value, and the valve opening and closing is performed. It is not necessary to increase the output of the stepping motor 23.
[0028]
In this embodiment, the C-ring spring 55 engaged with the circumferential groove 53 formed on the outer periphery of the guide member 13 biases the steel ball 51 toward the outer peripheral surface of the valve body 17. However, the steel ball 51 may be urged toward the outer peripheral surface of the valve body 17 from the outside of the guide member 13 by a spring plate or a coil spring applied to the steel ball 51 .
[0030]
Further, the present invention is not limited to the electric control valve shown in the present embodiment, and is widely applicable to a control valve having a valve body that is guided by a guide member and moves in the axial direction of the guide member. Needless to say.
[0031]
【The invention's effect】
As can be understood from the above description, the control valve according to the first aspect of the present invention is inserted into the valve body support hole formed by the cylindrical guide member so as to be movable in the axial direction of the guide member. A control valve having a valve body that is guided by the guide member and moves in the axial direction to open and close a valve port, wherein the valve body is moved in the axial direction with respect to the guide member in a manner allowing the guide member to move in the axial direction. The roll prevention mechanism is incorporated so that the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole.
[0032]
For this reason, the valve body is urged in the radial direction, the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole, and the valve body is in a state of being preloaded to the guide member. Therefore, even if the movement of the valve body in the radial direction of the guide member is appropriately regulated and the valve body receives a force from a high-speed unsteady flow in a minute valve opening state, the valve body is in the radial direction of the guide member. The vibration is eliminated and the generation of vibration noise is avoided.
[0033]
According to the control valve of the invention of claim 1 , the roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and presses against the outer peripheral surface of the valve body, It is assumed that the pressing element is constituted by a spring that urges the pressing element toward the outer peripheral surface of the valve body.
[0034]
For this reason, the valve body is urged in the radial direction of the guide member by the spring via the pressing element, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole by this urging force. The body is given a radial preload, the movement of the valve body in the radial direction of the guide member is appropriately restricted, and the valve body receives a force from a high-speed unsteady flow in the minute valve opening state. However, the valve body does not vibrate in the radial direction of the guide member, and generation of vibration noise is avoided.
[0035]
According to the control valve of the first aspect of the present invention, the pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is applied to the outer peripheral surface of the guide member. It is a flexible arc spring that is mounted and contacts the steel ball from the outside of the guide member.
[0036]
For this reason, the valve body is urged in the radial direction of the guide member via the steel ball by the arc spring, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole by this urging force, The valve body is given a radial preload, the movement of the valve body in the radial direction of the guide member is appropriately regulated, and the valve body receives a force from a high-speed fluid in a minute valve opening state. However, the valve body does not vibrate in the radial direction of the guide member, and generation of vibration noise is avoided.
[0037]
Further, when the valve body moves in the axial direction of the guide member, the steel ball rolls in the through hole of the guide member, so that the increase in the sliding resistance of the valve opening / closing by the roll prevention mechanism is suppressed to a small value. Therefore, it is not necessary to increase the output of the drive source for opening and closing the valve.
[Brief description of the drawings]
FIG. 1 is an overall sectional view showing an embodiment in which a control valve according to the present invention is applied to an electric control valve.
FIG. 2 is an enlarged cross-sectional view showing a main part of a control valve according to the present invention.
3 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve housing 3 Inlet port 5 Valve chamber 7 Valve seat part 9 Valve port 11 Outlet port 13 Guide member 15 Valve body support hole 17 Valve body 19 Cylindrical stem part 20 Conical valve part 21 Mount member 23 Stepping motor 25 Cover 27 Stator coil 29 Rotor 31 Permanent magnet 33 Rotor body 35 Connecting rod 37 Male thread part 39 Female thread member 41 Pin 43 Fixed rod 45 Spiral guide member 47 Movable stopper piece 49 Through hole 51 Steel ball 53 Circumferential groove 55 C ring spring 57 Vertical groove

Claims (1)

A valve body which is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member, and which is guided by the guide member and moves in the axial direction to open and close the valve port. Having a control valve,
The valve body is urged in the radial direction of the guide member in a manner allowing movement in the axial direction with respect to the guide member, and an outer peripheral surface portion of the valve body is a portion of an inner peripheral surface of the valve body support hole. rolling preventing mechanism for pressing the is incorporated,
The roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and presses against the outer peripheral surface of the valve body, and biases the presser toward the outer peripheral surface of the valve body. It consists of a spring and
The pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is hooked on the outer peripheral surface of the guide member and abuts the steel ball from the outside of the guide member. A flexible arc spring;
The steel ball engages with a key groove-like vertical groove formed on the outer peripheral surface of the valve body and extending in the axial direction, so that the guide member extends in the circumferential direction with respect to the through hole of the key groove. A control valve characterized in that relative movement is restricted .

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