JP2002243058A - Solenoid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct high-accuracy proportional flow control by making compatible ensuring for a valve element's moving in the approaching and separating direction with parallelism to a valve seat with lessening of frictional resistance in moving the valve element and lessening of hysteresis of a valve position. SOLUTION: There are provided two guide parts (guide shaft part 29C, 29D- guide holes 30, 31) of the valve element 29, and the respective sliding surfaces are given by high-lubricity resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic control valve, and more particularly to an electromagnetic control valve such as an electromagnetic proportional expansion valve for a refrigeration cycle device and an electromagnetic proportional flow valve for a fuel cell system.

[0002]

2. Description of the Related Art As an electromagnetic control valve for proportional flow control, an electromagnetic proportional expansion valve used in a refrigeration cycle device such as an air conditioner and an electromagnetic proportional flow valve used in a fuel cell system for controlling a fuel gas flow. As an electromagnetic control valve of this type, the one disclosed in Japanese Utility Model Publication No. 7-18939 is known.

An electromagnetic control valve for proportional flow control includes a valve housing that defines a valve port, an inlet / outlet port, and the like, a valve body provided in the valve housing to open and close the valve port, a plunger, a suction element, and a coil unit. A solenoid valve that opens and closes the valve body, and biasing means such as a spring that biases the valve body in a direction opposing the valve driving force of the electromagnetic solenoid device. The opening position of the valve body with respect to the valve port is determined by the equilibrium relationship between the driving force and the urging force of the valve, and the flow rate can be proportionally controlled according to the coil current of the electromagnetic solenoid device.

[0004]

In order to perform the proportional flow rate control with the coil current control with high accuracy in the above-described electromagnetic control valve, the following is necessary. (1) The valve body moves in the separating / contacting direction while maintaining the parallelism with respect to the valve seat defined around the valve port without rattling. (2) The frictional resistance during the movement of the valve body is small, and the hysteresis of the valve position with respect to the coil current of the electromagnetic solenoid device is small.

However, in the conventional electromagnetic control valve, regarding (1), the valve body is formed at one end of the valve rod, and the other end extends toward the plunger of the electromagnetic solenoid device. Since it can be performed only on the plunger side of the electromagnetic solenoid device rather than the seat, it is difficult to guarantee that the valve body moves in the direction of contact and separation while maintaining parallelism with respect to the valve seat. This can be improved to some extent by reducing the gap between the outer peripheral surface of the valve stem and the inner peripheral surface of the guide portion, but on the other hand, the frictional resistance during the movement of the valve body increases, and the hysteresis of the valve position decreases As the size increases, it becomes difficult to perform the proportional flow rate control with high accuracy.

Regarding (2), by reducing the dimension of the guide portion in the axial direction of the valve stem, or by increasing the gap between the outer peripheral surface of the valve stem and the inner peripheral surface of the guide portion, friction at the time of valve body movement is improved. Although the resistance is reduced, however, the degree of guarantee that the valve body moves in the direction of contact and separation while maintaining the parallelism with respect to the valve seat decreases, and it becomes difficult to perform proportional flow control with high accuracy.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is intended to ensure that a valve body moves in a separating and approaching direction while maintaining parallelism with respect to a valve seat. It is an object of the present invention to provide a high-performance electromagnetic control valve capable of performing high-accuracy proportional flow control while achieving both low frictional resistance during movement and low hysteresis at the valve position.

[0008]

In order to achieve the above-mentioned object, an electromagnetic control valve according to the present invention includes a valve housing defining a valve port, an inlet / outlet port, and the like, and a valve housing provided in the valve housing. An electromagnetic solenoid device that includes a valve body that opens and closes a port, a plunger, a suction element, a coil unit, and the like, and that opens and closes the valve body, and attaches the valve body in a direction that opposes a valve driving force of the electromagnetic solenoid device. An electromagnetic control valve including a biasing means for biasing, wherein a first guide shaft portion is provided integrally on one side of the valve body, and a second guide shaft portion is provided integrally on the other side of the valve body, The first guide shaft and the second guide shaft are slidably fitted in a guide hole of the valve housing or the suction element fixedly connected to the valve housing.

According to this configuration, each of the first and second guide shafts located on both sides of the valve body allows
Since the movable support of the valve body is performed at two locations separated from each other in the axial direction with the valve body interposed therebetween, the movable support of the valve body is reliable, and the backlash during opening and closing movement of the valve body is reduced, The linear movement (parallel movement) of the valve body is improved.

In the electromagnetic control valve according to the present invention, the sliding surface between the first guide shaft portion and the guide hole and the sliding surface between the second guide shaft portion and the guide hole have high lubricity. It is provided by a resin.

According to this configuration, since the sliding surfaces of the first guide shaft, the second guide shaft and the guide hole are provided by the highly slippery resin, the friction at the time of moving the valve body is improved. Resistance decreases.

[0012] In the electromagnetic control valve according to the present invention, a ball member is further disposed at a connection portion between the urging means and the valve body, and the urging force of the urging means is applied to the valve body via the ball member. It is transmitted.

According to this configuration, even if the ball member acts like a spherical joint between the urging means and the valve element, even if there is an inclination in the axial direction of the urging means and the axial direction of the valve element, The biasing force of the biasing means is prevented from acting on the valve body with an eccentric load.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment in which the electromagnetic control valve according to the present invention is applied as an electromagnetic proportional expansion valve for a refrigeration cycle device.

The electromagnetic proportional expansion valve is connected to the housing body 12.
A valve housing assembly 1 comprising an inner housing member 13 disposed in the housing body 12 and a lid member 15 screwed to the housing body 12 by a screw portion 14.
One.

An inlet port 16 and an outlet port 17 are formed in the housing body 12, and each of them has a pipe joint 18,
19 are attached. The inner housing member 13 has inlet-side passage holes 20 and 21 and outlet-side passage holes 22 and 2.
3. The valve ports 24 and 25 are each formed to penetrate in the radial direction.

On the one hand, the valve port 24 communicates with the inlet port 16 via an inlet passage hole 21 and a gap 26 and on the other hand communicates with the outlet port 17 via an outlet passage hole 22. The valve port 25 communicates on one side with the inlet port 16 via the inlet-side passage hole 20, and on the other hand, the outlet-side passage hole 23, the gap 27, and the internal passage hole 28.
Communicates with the outlet port 17.

The valve port 24 and the valve port 25 are on the same axis, and one spool valve element 29 is inserted into the valve port 24 and the valve port 25 so as to be movable in the axial direction (vertical direction).

The spool valve element 29 has a land portion 2 for setting the opening of the valve port 24 based on the positional relationship with the valve seat portion 24A.
9A and a land portion 29B for setting the opening degree of the valve port 25 based on the positional relationship between the other valve seat portion 25A. The spool valve element 29 increases both the opening degrees of the valve ports 24 and 25 by moving upward in FIG. 1, and increases the opening degrees of the valve ports 24 and 25 by moving downward in FIG. 1. Both decrease.

Guide shaft portions 29C and 29D are integrally provided at both ends of the spool valve body 29, respectively. The guide shaft portion 29C is slidably fitted in a guide hole 30 formed in the inner housing member 13, and the guide shaft portion 29C is connected to another guide hole 3 formed in the inner housing member 13.
1 is slidably fitted.

The outer peripheral surfaces of the guide shaft portions 29C and 29D are coated with a highly lubricating resin p such as a fluororesin. As a result, the guide shaft portions 29C and 29D have the resin holes made of the highly lubricious resin p and have the guide holes 30, 31 respectively.
Are fitted in sliding contact.

A spring chamber 32 is formed at an end (lower end) of the inner housing 13. The spring chamber 32 is provided with a movable spring retainer 33 and a fixed spring retainer 34 screwed to the inner housing 13.
3 and a fixed spring retainer 34, a compression coil spring 35
Is provided.

The spool valve body 29 of the movable spring retainer 33
A spherical receiving portion 36 is formed on a surface portion facing the spherical receiving portion 36, and the spherical receiving portion 36 and the facing end portion 29E of the spool valve element 29 are formed.
A ball member (steel ball) 37 is disposed between the two. The ball member 37 is in contact with the spherical receiving portion 36 on one side, and is in contact with the opposite end portion 29E of the spool valve body 29 on the other side. With this structure, the spring biasing force of the compression coil spring 35 is applied to the spool valve body 29 via the ball member 37.
Is transmitted to

An electromagnetic solenoid device 41 is attached to an end (upper end) of the housing body 12. The electromagnetic solenoid device 41 includes a suction element 42 screwed to the housing body 12 and a bottom plate 43 fixed to the suction element 42.
An outer box 44 attached to the bottom plate 43;
Plunger tube 45 fixed to the upper plate 4
7 and a plug-shaped coil guide member 48 connected to the outer case 44.

The electromagnetic solenoid device 41 further includes a plunger 49 movably disposed in a plunger tube 45.
And a guide pin 50 attached to the plunger 49
A plunger spring 51 provided between the coil guide member 48 and the plunger 49;
5 has a flanged cylindrical magnetic path guide member 52 and a coil portion 53 attached to the outer peripheral portion, and an electrically insulating resin molded portion 54 of the coil portion 53.

The suction element 42 supports the intermediate rod 56 together with the plug 55. The intermediate rod 56 is connected to the plunger 4
9 and the spool valve element 29, and transmits the movement of the plunge 49 to the spool valve element 29.

The inner housing member 13, the suction element 4
2. The plunger 49 and the plug 55 are provided with passage holes 57, 58, 59, and 60 for equalizing the respective parts.

The above-described electromagnetic proportional expansion valve operates as follows. Coil section 5 of electromagnetic solenoid device 41
When a current is applied to 3, the magnetic attractive force is generated in accordance with the amount of current, and the plunger 49 is attracted toward the attracting element 42 by the magnetic attractive force. This suction force is applied to the intermediate rod 5
6 acts on the spool valve element 29.

As a result, the vertical movement position (valve opening position) of the spool valve body 29 is determined by the equilibrium relationship between the suction force of the electromagnetic solenoid device 41 and the spring force of the compression coil spring 35, and the valve port is set accordingly. 24, the opening of the valve port 25 is determined.

The spool valve element 29 is supported by the inner housing member 13 at two locations separated from each other in the axial direction by the guide shaft portions 29C and 29D located on both sides (both ends) of the spool valve element 29. Spool valve element 29
The movable support of the spool valve body 29 is less likely to rattle during opening and closing movement of the spool valve body 29, the spool valve body 29 is not tilted, and the linear movement of the spool valve body 29 (parallel movement).
Is improved.

As a result, the spool valve body 29 moves in the direction of contact and separation while maintaining the parallelism with respect to the valve seats 24A and 25A defined around the valve ports 24 and 25 without rattling. Is guaranteed.

Further, the outer peripheral surfaces of the guide shaft portions 29C and 29D are coated with a high lubricity resin p such as a fluororesin, and the guide shaft portions 29C and 29D are respectively coated with the high lubricity resin p.
Slidably fitted in the guide holes 30 and 31 with the resin film formed by the above, the frictional resistance during the movement of the valve body is reduced even if the gap between the fitting portions is small, and the valve position of the electromagnetic solenoid device 41 with respect to the coil current of the electromagnetic solenoid device 41 is reduced. Hysteresis is reduced.

Further, the ball member 37 acts like a spherical joint between the compression coil spring 35 as the urging means and the spool valve body 29, the compression coil spring 35 meanders, and the compression coil spring 35 moves in the axial direction. And the axial direction of the spool valve body 29, the spring force of the compression coil spring 35 acts in a direction perpendicular to the spool valve body 29, and the spring force of the compression coil spring 35 It does not act due to eccentric load.

This also prevents the spool valve body 29 from tilting, prevents the occurrence of partial frictional resistance, and allows the spool valve body 29 to move smoothly. As a result, the electromagnetic proportional expansion valve performs highly accurate proportional flow rate control.

FIG. 2 shows an embodiment in which the electromagnetic control valve according to the present invention is applied as an electromagnetic proportional flow valve for a fuel cell system.

The electromagnetic proportional flow valve has a valve housing 71. An inlet port 72, an outlet port 73, a valve port 74, and a valve chamber 75 are formed in the valve housing 71.

A valve body 76 is disposed in the valve chamber 75.
The valve body 76 has a valve port 7 depending on the positional relationship with the valve seat 77.
The opening degree of the valve port 4 is set, and the opening degree of the valve port 27 is increased by moving upward in FIG. 2, and the opening degree of the valve port 74 is decreased by moving downwardly in FIG.

Guide shaft portions 78 and 79 are provided integrally on both sides of the valve body 76 in the axial direction. The guide shaft 78 is inserted into a guide hole 80 formed in the valve housing 71. The guide shaft 79 also serves as a plunger rod of the electromagnetic solenoid device 101 described later, and is inserted into a guide hole 81 formed in a suction element 102 fixed to the valve housing 71.

Bearing bushes 82 and 83 made of a highly lubricating resin such as fluororesin are fixed to the guide holes 80 and 81 by bush holding members 84 and 85. 79 are slidably fitted.

At the end (lower end) of the valve housing 71, a spring chamber 86 is formed. The spring chamber 86 is provided with a movable spring retainer 87 and a fixed spring retainer 88 screwed to the valve housing 71, and a compression coil spring 89 is provided between the movable spring retainer 87 and the fixed spring retainer 88.

On the surface of the movable spring retainer 87 facing the guide shaft 78, a spherical receiving portion 90 is formed, and a ball member is provided between the spherical receiving portion 90 and the facing end of the guide shaft 78. (Steel ball) 91 is arranged. Ball member 9
1 is in contact with the spherical receiving portion 90 on one side, and is in contact with the opposite end of the guide shaft portion 78 on the other side. With this structure, the spring biasing force of the compression coil spring 89 is transmitted to the valve body 76 integrated with the guide shaft 78 via the ball member 91.

An electromagnetic solenoid device 101 is attached to an end (upper end) of the valve housing 71. The electromagnetic solenoid device 101 includes a suction element 102 screwed to the valve housing 71 and a bottom plate 1 fixed to the suction element 102.
03, an outer casing 104 attached to the bottom plate 103, a plunger tube 105 fixed to the suction element 102,
A plug-shaped coil guide member 106 fitted and mounted on the upper end of the plunger tube 105 is provided.

The electromagnetic solenoid device 101 further includes a plunger 1 movably disposed in a plunger tube 105.
07, a plunger spring 108 provided between the coil guide member 106 and the plunger 107, and a flanged cylindrical magnetic path guide member 109 and a coil portion 110 mounted on the outer periphery of the plunger tube 105. ing. The plunger 107 is fixedly connected to the tip of the guide shaft 79.

The valve housing 71, the bush pressing member 85, the suction element 102, and the plunger 107 are provided with passage holes 92, 93, 94, 95 for equalizing the respective parts.

The electromagnetic proportional flow valve having the above configuration operates as follows. When the coil portion 110 of the electromagnetic solenoid device 101 is energized, a magnetic attractive force corresponding to the amount of the current is generated, and the plunger 1 is moved by the magnetic attractive force.
07 is sucked to the suction element 102 side. This suction force acts on the valve body 76 by the guide shaft 79 also serving as the plunger rod.

Thus, the vertical movement position (valve opening position) of the valve body 76 is determined by the balance between the suction force of the electromagnetic solenoid device 101 and the spring force of the compression coil spring 89, and the valve port 74 is accordingly determined. Is determined.

The valve body 76 is separated from the valve housing 71 and the suction element 10 at two locations separated from each other in the axial direction by guide shaft portions 78 and 79 located on both sides (both ends) of the valve body 76.
Since the valve body 76 is supported by the movable body 2, the movable body of the valve body 76 is surely supported, so that the backlash during opening and closing movement of the valve body 76 is reduced. Mobility) is improved.

As a result, it is ensured that the valve body 76 moves in the disengagement direction while maintaining the parallelism with respect to the valve seat portion 77 defined around the valve port 74 without rattling.

The guide holes 80 and 81 are provided with bearing bushes 82 and 83 made of a highly lubricating resin such as a fluororesin, and the guide shaft portions 78 and 79 slide on the bearing bushes 82 and 83 made of a high lubricating resin. Since they are in contact with each other, even if the gap at the fitting portion is small, the frictional resistance during the movement of the valve body is reduced, and the hysteresis of the valve position with respect to the coil current of the electromagnetic solenoid device 101 is reduced.

Also in this case, the ball member 91 acts as a spherical joint between the compression coil spring 89 as the urging means and the valve body 76, and the compression coil spring 89 is meandering. The spring force of the compression coil spring 89 does not affect the valve body 7 even if the axial direction of the valve body 76 and the axial direction of the valve body 76
6, and the spring force of the compression coil spring 89 does not act on the valve body 76 due to an uneven load.

This also prevents the valve body 76 from tilting, prevents the occurrence of partial frictional resistance, and allows the valve body 76 to move smoothly. As a result, the electromagnetic proportional flow valve performs highly accurate proportional flow control.

In the above-described embodiment, only one side of the sliding surface between the guide shaft and the guide hole is provided by the highly slippery resin. A structure may be provided on both sides of the surface with a highly slippery resin,
Instead of the highly lubricating resin, the sliding surfaces of the guide shaft and the guide hole may be made of a mirror-finished metal surface.

[0053]

As will be understood from the above description, according to the electromagnetic control valve of the present invention, the first guide shaft and the second guide shaft located on both sides of the valve body allow the valve body to be operated. The movable support of the valve body is performed at two places separated from each other in the axial direction with the valve body interposed therebetween, so that the movable support of the valve body is assured, the backlash during opening and closing movement of the valve body is reduced, The straight movement (parallel movement) of the body is improved.

Further, since the sliding surfaces of the first guide shaft, the second guide shaft and the guide hole are provided by a highly slippery resin, the frictional resistance during the movement of the valve body is reduced. And the hysteresis is reduced. As a result, the valve opening / closing characteristics as designed can be obtained.

Further, the ball member acts like a spherical joint between the urging means and the valve body, and even if there is an inclination in the axial direction of the urging means and in the axial direction of the valve body, the urging means does not move. Since the biasing force is prevented from acting on the valve body with an uneven load, this also reduces the frictional resistance during the movement of the valve body, reduces hysteresis, and achieves the valve opening / closing characteristics as designed. Become.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which an electromagnetic control valve according to the present invention is applied as an electromagnetic proportional expansion valve for a refrigerating cycle device.

FIG. 2 is a cross-sectional view showing one embodiment in which the electromagnetic control valve according to the present invention is applied as an electromagnetic proportional flow valve for a fuel cell system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Valve housing assembly 12 Housing main body 13 Inner housing member 16 Inlet port 17 Outlet port 24, 27 Valve port 29 Spool valve body 29A, 29B Land part 29C, 29D Guide shaft part 30, 31 Guide hole 35 Compression coil spring 37 Ball member 41 electromagnetic solenoid device 42 suction element 49 plunger 53 coil part 71 valve housing 72 inlet port 73 outlet port 74 valve port 75 valve chamber 7 76 valve element 82, 86 bearing bush 89 compression coil spring 101 electromagnetic solenoid device 102 suction element 102 107 plunger 110 Coil part p High lubricity resin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H106 DA05 DA12 DA23 DB02 DB12 DB23 DB32 DC02 DD03 EE34 EE35 EE48 GA22 GA23 GC29 KK01 KK23 KK34

Claims (3)

[Claims] A valve housing that defines a valve port, an inlet / outlet port, and the like, a valve body provided in the valve housing to open and close the valve port, a plunger, a suction element, a coil part, and the like. An electromagnetic control valve including an electromagnetic solenoid device that opens and closes a valve element and an urging unit that urges the valve element in a direction that opposes a valve driving force of the electromagnetic solenoid device, wherein one side of the valve element A first guide shaft portion, a second guide shaft portion is integrally provided on the other side of the valve body, and the first guide shaft portion and the second guide shaft portion are the valve housing or An electromagnetic control valve, wherein the suction element fixedly connected to the valve housing is slidably fitted in a guide hole. 2. A sliding surface between the first guide shaft portion and the guide hole and a sliding surface between the second guide shaft portion and the guide hole are provided by a highly slippery resin. The electromagnetic control valve according to claim 1, wherein: 3. A ball member is disposed at a connecting portion between the urging means and the valve body, and the urging force of the urging means is transmitted to the valve body via the ball member. The electromagnetic control valve according to claim 1.