JPS6231785A - Solenoid valve - Google Patents

Abstract

PURPOSE:To improve the response performance by forming the both edge parts in the direction of shift of a movable part which is shifted by the excitation of the coils arranged, keeping an interval, from the permanent magnets opposed with different electrodes. CONSTITUTION:A movable part 34 is formed from an intermediate valve piece 41 and the permanent magnets 42 and 43 jointed onto the both sides of the valve piece 41, and said permanent magnets are arranged, opposed with different electrodes, for example with an S-electrode at right side and an N-electrode at left side. When excitation is performed so that the opposed sides of the coils 30 and 31 form N-electrodes, a movable part 31 shifts rightward, and a port P side is cut off to connect a port A with a port R. On the contrary, when the coil is excited so that an S-electrode is formed, the movable part 34 shifts leftward, and the port R is cut off to connect the port A with the port P.

Description

[Detailed Description of the Invention] <Industrial Application Fields> Electromagnetic valves used in fields that require high-speed operation, such as for controlling the fuel injection amount of marine diesel engines, 5-magnetic valves, and solenoid valves for vehicle skid prevention + J- devices. It concerns valves.

<Prior Art> Conventionally, a solenoid device using a permanent magnet for reciprocating a shaft in the axial direction is disclosed in, for example, Japanese Patent Laid-Open No. 60-62102. The outline will be explained using FIG. 2. In the figure, 3.3 is a coil wound around the bobbin 22, 24 is a center yoke, 25 is an outer yoke, and lla.

11b is an end yoke. 6 is a shaft, and a ferrite magnet 7 is attached to this shaft. The magnetic core 83% 8b is fixed with a fixing ring 9. Note that the magnet 7 is magnetized in the axial direction.

This solenoid device energizes the coil 3.3 on its opposing surface to the south pole as shown in the figure, with the south pole appearing on the center yoke 24 and the north pole appearing on the end yokes (lla, l1l). At this time, a permanent magnet consisting of a ferrite magnet 7 fixed to the shaft 6 and magnetic cores 8a and 8b is attached to the left core 8 as shown in the figure.
The core 8b on the right is polarized as the S pole, the core 8b on the left is polarized as the N pole, and the core 8a on the left is the center yoke 24 of the core 8a.
At the same time, the core 8b on the right side is repelled by the end yoke lla on the left side, and the core 8b on the right side is repelled by the end yoke llb on the right side. Therefore, the shaft 6 moves to the left. When the direction of the current is changed, the center yoke 24 becomes the N pole and the end yoke ll
a 111b is the S pole toner, and the shaft 6 moves to the right.

<Problems to be Solved by the Invention> In the conventional technology described above, magnetic cores are arranged on both sides of a ferrite magnet as a permanent magnet.

Attenuation of the magnetic force occurs at the contact area between the two and the magnetic core, and the repulsive force and attractive force of the permanent magnet are substantially weak.When used as the drive part of a solenoid valve that requires high-speed response, However, there was a problem in that the response speed was not necessarily satisfactory.

A technical object of the present invention is to obtain a highly responsive electromagnetic valve by making maximum use of the magnetic force of the permanent magnet, that is, by making the most effective use of the repulsion and attraction forces of the permanent magnet.

Means for Solving the Problems> The means of the present invention is to arrange coils each having a fixed core at intervals on the same axis, and to excite the coils to move the fixed cores along the axis. In the electromagnetic valve, the movable part is supported by a fixed support part so that the movable part moves, and the fluid flowing through a predetermined fluid passage is controlled by the movement of the movable part. Both permanent magnets are arranged so that they face each other with different polarities.

Function> The movable part exhibits constant polarity, S at one end and N at the other end. If both coils are energized so that the sides facing each other are the same, for example N pole, the fixed iron core will also be magnetized in the same way, so the movable part will be either at the end that is the S pole or at the end that receives the attractive force and is the N pole. moves to one side due to the repulsive force. Also, if you change the current direction so that the opposite sides of the coil are both S poles,
The movable part moves in the opposite direction to the above due to the attraction and repulsion forces.

Electricity is required to move the movable parts from one side to the other and from the other side to the other, but after movement, even if no electricity is applied, the moved state is maintained by the attraction action of the permanent magnet.

<Example> FIG. 1 shows an example of the present invention. In the figure, 3
0.31 is a coil, 32.33 is a fixed core, 34 is a movable part, 35 is a support part, A, P, and R are ports of the solenoid valve, and 36 is the entire solenoid valve.

The coils 30,31 are coaxially spaced apart and are generally conventional.

Fixed iron core 32% 33 is one member 32a, 32b,
32c, 33a.

33b and 33c. Member 32a, 3
An intermediate member 37 made of a non-magnetic material is provided between 2b and 33a, 33b, and this member 37 has a port A.
is provided, and an internal cavity connected to this port A is formed as a fluid passage 38. Further, the first member 32c is provided with a port P, and a fluid passage 39 is connected thereto.

A port R is provided in the member 33c, and one passage 40 is connected thereto.

The movable part 34 is formed of an intermediate valve body 41 and permanent magnets (ferrite magnets) 42 and 43 coupled (for example, screwed and pinned) to both sides of the intermediate valve body 41, and includes coils 30, 3.
The member 32c of the fixed core 32.33 along the central axis of 1
, 33c, and is supported by the support portion 35 in contact with the inner surface of the center hole of the valve body 41.

The permanent magnets 42 and 43 are cylindrical and magnetized in the direction of the central axis, and both are provided so that the south pole is located on the right side of the figure and the north pole is located on the left side.

The support body 35 is a member 32 cm 33 of a fixed iron core 32.33.
C' is fixed with the central axes aligned, and inner holes reaching from both ends to the middle part are opened to the outer periphery separately, and one of the inner holes is connected to the fluid connected to port P. A passage 39 is provided, and the other inner hole is provided as a passage 40 connected to the port R. This passage 39.
A passage 44 extending from the center hole to the outer periphery is provided in the valve body 41 corresponding to the openings 39a and 40a of the valve body 40. Close the opening 39a to connect the passage 38 and the passage 39, that is, port A and port P, and close the opening 39a while moving to the right to connect the passage 38 and the passage 40, that is, port A and port A. Connect to port R. Note that 45 and 46 in the figure are passages connecting the passage 44 to both ends of the movable part 34, through which fluid enters and exits as the movable part 34 moves.

The electromagnetic device 36 configured in this manner operates as follows. The right end of the movable part 34 is always the S pole, and the left end is the N pole. Coil 30. ．． When the fixed iron cores 32 and 33 are magnetized in the same way, the movable part 34 moves to the right as shown in the figure. In this state, the port P side is shut off and the boat A and the boat are connected. Next, when the coils 30 and 31 are excited so that the opposite sides thereof become S poles, the fixed cores 32 and 33 are similarly magnetized, so that the movable member 34 is moved to the left from the state shown in the figure. move towards The moved state is a state in which the boat R side is cut off and port A) and port P are connected.

In the above embodiment, when the flexible #J member 34 moves, one of the permanent magnets 42 or 43 receives a repulsive force from the coil 30 or 31, but if the degree of excitation of the coil in this case is large,
Since the permanent magnet will be demagnetized, in consideration of this point, it is appropriate to increase the degree of excitation of both coils on the side that attracts the movable member and to decrease the degree of excitation on the side that repels the movable member. Note that even if the permanent magnet is slightly demagnetized, it will be automatically re-magnetized the next time it is attracted.

In the above embodiments, a valve is shown whose valve action is to connect port A to port P or R, but a valve with a different configuration can also be used at high speed if it can be switched between two positions. Responsiveness is achieved.

<Effect of the invention> According to this invention, yes! The # part or both ends thereof are moved by the attraction and repulsion forces in the same direction due to the excitation of the coil, so the fluid moves extremely rapidly, and the fluid that flows through the predetermined fluid path is caused by the movement of the rapidly moving movable part. Since it is designed to control electromagnetic waves, it is possible to use electromagnetic waves with high responsiveness.

Further, even if both coils are demagnetized, the current state is maintained, so there is an effect of energy saving and miniaturization. In this regard, in the case of a structure that allows high-speed operation against general spring drag, it is necessary to increase the current to the coil or increase the size of the coil itself, which may cause heat generation and increase in volume. The problem remains. Furthermore, in the case of a sinking structure using a permanent magnet, there remains the problem that the coil must be continuously energized in order to maintain the switched state in the soil where the above-mentioned problem exists.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of an example of a conventional solenoid device. 30.31...Coil, 32. :'i3...Fixed iron core, 34...Movable part, 35...Support part, 36...
Solenoid valve, 38.3 (j, 40...fluid passage. Patent applicant: Japan Air Brake Co., Ltd. Agent)
Tetsu Shimizu and 2 others 10

Claims (2)

[Claims] (1) Coils each having a fixed core are arranged at intervals on the same axis, and the movable part is fixedly supported so that the movable part moves between the fixed cores along the axis when the coils are excited. In the electromagnetic valve that is supported by a section and controls fluid flowing through a predetermined fluid passage by movement of the movable section, both ends of the movable section in the moving direction are formed of permanent magnets, and both permanent magnets are different from each other. Solenoid valves with poles facing each other. (2) A solenoid valve according to claim (1), wherein a fluid passage is formed across the movable part and the fixed support part.