JPH03223581A - Electromagnetic control valve - Google Patents

Abstract

PURPOSE:To obtain a stable operation of a valve operating system by forming a valve and a movable iron core integrally to transmit the electromagnetic force of the movable iron core directly to the valve, and providing communication holes to the valve and the movable iron core so as to slide the movable iron core in the airtight condition. CONSTITUTION:When an input current is applied from a terminal 2, a movable iron core 13 is attracted in the direction of a fixed iron core 5 side, and since a valve 24 is formed integrally to the movable iron core 13, the electromagnetic force acting to the movable core 13 is transmitted directly to the valve 24. Communication holes 24a and 13a are provided to the valve 24 and the movable iron core 13 respectively, and the balances of the pressure between a pressure chamber 21 and a fluid chamber 22, and the pressure in the space between the fixed iron core 5 and the movable iron core 13 are maintained constant. As a result, the movable iron core 13 can slide in the airtight condition without receiving the influence of the pressure variation of the fluid, making a valve guide 14 fitted and pressure-contacted to a yoke 15 as a guide. Consequently, the valve system members (the movable iron core 13, a rod 7, and the valve 24) can secure a stable operation without swaying.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention deals with load fluctuations of an automobile engine.
For throttle bypass air control to stabilize the idle rotation speed, purge control, etc., there are 10 control valves used to control the throttle bypass air control or purge control.

[Conventional technology]

FIG. 2 shows a sectional view of an example of a conventional electromagnetic proportional control valve.

In 1, .alpha.Q is a lunoid section that converts an electric signal into magnetic energy, and .alpha. is a valve section that adjusts the flow rate of the controlled fluid.

・Slenoid part (10) -C1(t) is an electromagnetic coil that creates a '-cra field based on the air signal, (2) is a terminal that applies an electric signal to the electromagnetic coil (1). (
3) is the yoke, (4a) is the front plate, (4
b) is the rear plate, these are the electromagnetic coils (1
) and constitute a magnetic circuit. (5)
is a fixed core located at the center of the electromagnetic coil (1), and (6) is a movable core that is fitted and crimped to the rod (7).
Further, one end of the rod (7) is supported by a bearing (8) and a spring receiver (9) provided on the rear plate (4b) side of the fixed iron core (5). (lla) is a main element for resisting the magnetic force of the electromagnetic coil (1) that attracts the movable core (6) and urging the rod (7) fitted and crimped onto the C movable core (6) toward the valve member. The subring (6) is an adjustment screw for adjusting the spring force of the main spring (lla).

Next, I will explain the structure of the valve part.

(16a) is the suction port for the controlled fluid, (16b) is the discharge port for the controlled fluid, and 07 is the suction port (16g)
The suction port (16a), the discharge port (16h) and the valve seat are integrated into a housing (11°C). The valve that opens and closes the valve seat αη, OI is the valve (11
The valve guide is used to guide the sliding movement of the valve guide. (18a) is a communication hole provided in the valve (c) to maintain a constant pressure balance between the pressure chamber Q0 and the fluid chamber.

The rod (7) to which the movable iron core (6) of the solenoid part (1) is fitted and crimped is connected to the valve 0 peak, and the rod (7) to the housing of the solenoid part (E) is connected to the housing of the solenoid part 01. The solenoid part 00 and the valve part (1) are connected to the yoke (3), and the solenoid part 00 and the valve part (1) are configured as a body.
), the valve (g), and the rod (7) to which the movable iron core (6) is fitted and crimped is referred to as the valve operating system member of the electromagnetic proportional control valve.

(E) is a leaf spring clamped and fixed between the housing α and the front plate (4a), and the valve train member is attached with the rod (7) passing through the center of this leaf spring (2). This leaf spring (c) plays the role of preventing swinging of the movable iron core (6) to which the rod (7) is fixed.

Also, the tip of the rod (7) is connected to the bottom surface (18b) of the valve (G).
), and furthermore, the valve α barrel is an auxiliary spring (llb),
The rod (7) is supported movably in the axial direction by a main spring (lla) and a spring receiver (9).

Moreover, since the rod (7) is also supported by a bearing (8) provided on the fixed iron core (5), the plate (H) is
It has a two-point support structure at one angle in the axial direction.

Next, I will explain the operation. When an electric signal is input from the terminal (2) of the electromagnetic coil (1), electromagnetic energy is generated in the coil and the movable iron core (
6) is attracted in the direction of the fixed iron core (5) by an electromagnetic force proportional to the current value. Then, the valve (to) is displaced to a position where the magnetic force and the spring force of the main spring (lla) biasing in the valve closing direction are balanced, and the fluid passage is opened. Therefore, there is a proportional relationship between the opening area of the fluid passage (the axial displacement position of the system) and the current value.

In addition, the valve (G) is provided with a communication hole (18a) to keep the pressure constant between the pressure chamber Qυ and the fluid chamber (B), so it is stable against pressure fluctuations in the controlled fluid. This provides excellent operating characteristics.

However, as mentioned above, in the electromagnetic proportional control valve, the rod (7) and the valve are only in contact with each other in the valve train, so the force that opens the valve is applied to the auxiliary spring (llb).
), and the attraction force toward the fixed core (5) due to the magnetic force acting on the movable core (6) is not utilized.

In order to eliminate this drawback, the valve (g) and the movable iron core (6
), and FIG. 3 shows an example of this, and is a sectional view of another conventional solenoid valve disclosed in, for example, Japanese Utility Model Application No. 60-7374.

Its configuration will be briefly explained.

The large diameter valve body part 6 and the small diameter iron core fitting part (2) of the valve body part 01) are integrally press-molded.
A pipe holder (2) is fitted 11 into the opening on the opposite side of the valve body, and a valve seat (to) is positioned concentrically with the iron core fitting part (3) of this pipe holder (to). There is a setting/C.

Further, a discharge port (to) is connected to the hole (b) of this valve seat (to), and a suction port C@ is connected to the pipe holder (to) in parallel with this discharge port (2). A movable iron core is slidably fitted inside the core fitting portion, and a ball-shaped valve body is integrally provided at the tip of the movable iron core. '[The valve seat is opposite to the valve seat (to) so as to be able to freely approach and separate from the valve seat. In addition, the movable iron core (to)
A spring Oυ is provided between the other end and the fixed iron core to bias the valve body (2) in the valve closing direction.

The spring force of this spring (1υ) is adjusted with a screw.

Further, an electromagnetic coil is provided on the outer periphery of the core fitting portion C-cut.

The solenoid valve shown in Fig. 3 is not an electromagnetic proportional control valve that adjusts the flow rate of the controlled fluid in proportion to the current value input to the electromagnetic coil as shown in Fig. 2; ) The valve body (to) is instantly opened or closed by the attractive force of the movable iron core (to) towards the fixed iron core side due to the strong magnetic force generated by the input current applied to ) or by the spring force of the spring θ. It is mainly used for applications that control the flow of fluid intermittently. Consider the case where a solenoid valve having such a structure is operated as a solenoid proportional control valve that adjusts the flow rate of fluid in proportion to the input current value. There is no problem if force is applied only in the axial direction to the movable core, but if the spring (B) that biases the valve body C'4 in the valve closing direction is installed at an angle with respect to the axial direction, or if the spring is ), an eccentric load acts on the center of load of the spring (AI) with respect to the axial direction (on the movable iron core when it curves due to eccentricity or buckling). When this unbalanced load acts, the movable iron core (to) and the valve body (2), which is integrally formed on the movable iron core, become supported at two points in the axial direction, and therefore tilt. The state is c! Create 1111. If the slope of the follower C becomes large, it will come into partial contact with the core fitting member, causing friction or a magnetically stuck state, making it difficult to operate smoothly in proportion to the current value.

In addition, if the magnitude and direction of the inclination of the movable iron core (to) fluctuates unstablely, the positional relationship between the valve body and the opening of the hole (b) of the valve seat (to) that connects to the suction port (e) will also become unstable. It becomes stable and the opening area is not constant.

In order to prevent such problems, if the gap between the movable core (to) and the core fitting part (2) is made smaller, the pressure on the fixed core ■ side of the movable core (to) and the pressure on the valve body (to) side will increase. Since the pressure balance is not constant, the current value of the electromagnetic coil that starts opening and closing of the valve body varies depending on the pressure of the controlled fluid, so an electromagnetic proportional control valve is used.
is inappropriate.

[Problem to be solved by the invention]

For example, a conventional electromagnetic proportional control valve as shown in Figure 2,
Since the structure is as described above, the valve and the rod are only in contact with each other, so the force to open the valve is only the force of the sub spring, which has the disadvantage that the electromagnetic force of the movable core is not utilized. A further disadvantage was that a leaf spring was not provided to prevent the movable iron core from swinging.

In addition, in conventional solenoid valves in which the valve and the movable core are integrally formed with the structure shown in the third factor, the movable core tends to tilt with respect to the axial direction during operation, and comes into contact with the core fitting part. Therefore, smooth flow control proportional to the current value is difficult.

Furthermore, since the opening area of the valve also varies depending on the magnitude and direction of the inclination of the movable iron core, stable flow control cannot be performed.

In addition, in order to improve this (reducing the gap in the sliding part of the movable iron core), as mentioned above, the problem that the current value of the electromagnetic coil that starts opening and closing will change due to the pressure of the controlled fluid will be solved. Occur.

This invention was made in order to solve the above-mentioned problems, and it allows the electromagnetic force of the movable core to be directly transmitted to the valve, and also includes valve train members (movable core, rod).

The valve operates smoothly without tilting in the axial direction, opens and closes the valve stably in accordance with the current value applied to the electromagnetic coil without being affected by fluid pressure, and is able to operate the valve stably in accordance with the current value applied to the electromagnetic coil without being affected by fluid pressure. The purpose is to obtain an electromagnetic control valve with a simpler structure.

[Means to solve the problem]

The electromagnetic proportional control valve according to the present invention has a valve and a movable core integrally formed with a communication hole for keeping the pressure of the controlled fluid and the pressure on the suction side (fixed core side) of the movable core constant. At the same time, the movable iron core is made into a sliding part for operation in the axial direction.

[Effect]

In this invention, since the valve and the movable core are integrally formed, the electromagnetic force of the movable core is directly transmitted to the valve, and by providing a communication hole in the valve and the movable core, the movable core itself is It is possible to slide closely, and it is possible to perform stable operation of the valve train and to stably adjust the flow rate according to the input current value of the electromagnetic coil.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the electromagnetic proportional control valve according to the present invention, in which (G) shows a flexible TIJJ that is fitted and crimped onto the rod (7).
ttk core, (13a) is a communication hole provided in the movable core O and communicates the pressure chamber with the suction side (fixed core side) of the movable core 03, and 04 is a valve guide fitted and crimped to the yoke Ofe. The movable iron core (2) has a tight gap with this guide and functions as a sliding part. The profit is the movable iron core (
This valve is also provided with a communication hole (24a) that communicates between the pressure chamber and the fluid chamber. Yoke QJ9 is constructed to also have the functions of a conventional front plate.

The rest of the configuration is the same as that of the conventional example shown in FIG. 2, so a description thereof will be omitted.

In the above configuration, when an input current is applied from the terminal (2), the movable core 03 forming the valve train is attracted by electromagnetic force in the direction of the fixed core (5), as in the conventional example. Since the valve (C) is integrally formed in this IIJ moving core ^1, the electromagnetic force acting on the movable core is directly applied to the valve (C).
It is transmitted to Also, since communication holes are provided in both the valve (c) and the movable core 03, the pressure in the pressure chamber Q◇ and the pressure in the fluid chamber (a) can be changed between the fixed core (5) and the movable core (
Since the pressure balance with the pressure in the space created in 1 is maintained constant, the movable iron core a3 is guided by the valve guide C which is fitted and crimped onto the yoke. It can slide airtight without being affected. Furthermore, the other end of the rod (7), which is fitted and crimped to the movable iron core, is supported by the bearing (8) as a sliding part.
In addition, since the movable iron core (to) is restrained in the radial direction by the valve guide o4, the valve train members (movable iron core (c), rod (7), valve (ro) )
) is supported at two points for motion in the axial direction, and (o) obtains stable motion without any movement.

In the above embodiment, the 1-ion has a structure that also has the functions of the conventional front plate (4a) shown in FIG. 2. However, as in the example of FIG. It may also be a member.

[Efficacy of invention for company i]

As described above, according to the present invention, the valve provided with the communication hole and the movable iron core are integrally formed, and the movable iron core is used as a sliding part, so that the electromagnetic force of the movable iron core can be directly transmitted to the valve. °C stable rIJ for axial operation
If you can get J-Ki, it will be effective.

In addition, the structure is simpler than conventional electromagnetic control valves, the number of parts can be reduced, and the cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an electromagnetic proportional control valve according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a conventional electromagnetic proportional control valve, and Fig. 3 is a cross-sectional view of a conventional electromagnetic proportional control valve. FIG. 2 is a sectional view of a conventional solenoid valve. In the figure, (1) is an electromagnetic coil, (7) is a rod,
(to) is the movable iron core, (16a) is the suction boat, (t6
b) is the discharge port, G is the valve seat, (c) is the valve, (13a
) (24a) is a communicating hole. In addition, the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A suction port and a discharge port for a controlled fluid, a valve seat provided between these ports, a valve that adjusts the flow rate by coming into contact with and away from the valve seat, and a movable iron core that supports the valve and a movable iron core for driving the valve. In an electromagnetic control valve consisting of a rod and an electromagnetic coil that drives the movable core and controls the position of the valve, the valve and the movable core are integrally formed, the movable core is a sliding part, and the movable core is controlled. An electromagnetic control valve characterized in that a communication hole is provided in the valve and the movable core so that the pressure on the fluid side and the pressure on the suction side of the movable core are constant.