JPH0596655U - solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] To improve performance during magnetic attraction and to reduce size. A protrusion 9 is provided to project a portion of the stopper member 8 that restricts the axial movement of the movable member 4 to the side opposite to the axial fixing member 2, and the movable member 4 can be housed in the protrusion 9. It is characterized by

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid used in, for example, a solenoid valve.

[0002]

[Prior Art]

 Conventional solenoids of this type include those shown in FIGS. 3 and 4, for example. That is, this solenoid includes a fixed member 100 made of a magnetic material, a movable member 101 made of a magnetic material coaxially arranged with the fixed member 100, and a coil 102 arranged so as to surround the fixed member 100. I have it. The coil 102 is housed in a hollow case 103, and a yoke member 104 for guiding a magnetic path from the case 103 to the movable member 101 is provided above the coil 102 so as to face the side surface of the movable member 101. Further, a flat stopper member 105 made of a non-magnetic material is provided on the yoke member 104 on the side opposite to the fixed member 100 so as to contact the yoke member 104 and regulate the axial movement of the movable member 101.

Then, by exciting the coil 102, a magnetic path of a closed loop is formed from the case 103, the yoke member 104, the movable member 101, and the fixed member 100, and the magnetic attractive force is utilized to move the movable member 101. Is fixed to the fixing member 100.

The solenoid is inserted and fixed in the mounting hole 108 of the mating mounting member 107 as shown in FIG. It is a solenoid valve. That is, the fixed member 100 serves as a valve seat, the movable member 101 serves as a valve body, and the fixed member 100 is provided with a flow path 106 having an opening on the movable member 101 side. The member 101 is magnetically attracted to the fixed member 100, which is the valve seat, to close the flow path 106, and the coil 102 is de-excited, so that the magnetic force of the fixed member 100, which is the valve seat, and the movable member 101, which is the valve body, is magnetic. The suction force disappears, the movable member 101 is pushed by the pressure of the fluid from the flow passage 106, and the flow passage 106 is opened.

[0005]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, since the shape of the stopper member 105 provided for holding the movable member 101 is flat, the yoke member 104 and the movable member 101 below the stopper member 105 are shown in FIG. By making the stroke S as described above, the length of the portion of the yoke member 104 facing the side surface of the movable member 101 is shortened, that is, the overlapping area of the movable member 101 and the yoke member 104 is changed, and the magnetic path area is reduced. And the magnetic flux may be reduced. As a result, the loss at the time of magnetic attraction becomes large, and in order to obtain the magnetic attraction force as needed, the yoke member 104 needs to be made thick, and the solenoid itself becomes large.

The present invention has been made in order to solve the above-mentioned problems of the conventional technology. The purpose of the present invention is to provide a solenoid that can improve performance during magnetic attraction and can be downsized. To do.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a fixed member made of a magnetic material, a movable member made of a magnetic material arranged coaxially with the fixing member, and a fixed member are provided so as to surround the fixed member. A coil to be placed, a stopper member provided on the side opposite to the fixed member for restricting the axial movement of the movable member, and provided in contact with the end surface of the stopper member and facing the side surface of the movable member, In a solenoid including a yoke member that guides a magnetic flux generated by energizing a coil to a movable member, a portion of the stopper member that restricts an axial movement of the movable member is provided on a side opposite to the axial fixed member. The present invention is characterized in that a projecting portion that projects is provided and that the movable member can be housed in the projecting portion.

[0008]

[Action]

 In the solenoid having the above configuration, the portion of the stopper member that restricts the movement of the movable member in the axial direction is provided with the protruding portion that protrudes to the side opposite to the axial fixing member, and the movable member can be housed in the protruding portion. Therefore, when the coil is de-energized, the movable member is housed in the above-mentioned protruding portion, and when the movable member moves to the fixed member side by the magnetic attraction force when the coil is excited, it moves from the housed position, so that it can move with the yoke member. The length of the facing portions of the side surfaces of the member does not change, that is, the overlapping area of the yoke member and the movable member does not change, so the magnetic path area does not change. Therefore, the loss of magnetic attraction can be reduced.

[0009]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes a solenoid which serves as a solenoid valve as shown in the prior art, and generally includes a fixing member 2 made of a magnetic material, and a fixing member 2 made of a magnetic material. The coil 3 is arranged so as to surround the fixing member 2, and the plunger 4 as a movable member made of a magnetic material is provided in the coil 3 coaxially with the fixed member 2 made of a magnetic material. The coil 3 is housed in a hollow case 5 that is integrally provided with the fixing member 2, and the plunger 4 is connected via the sleeve 6 to the plunger 4 by utilizing the magnetic attraction generated by energizing the coil 3. It is designed to reciprocate in the inside of 3.

The case 5 is made of a magnetic material and has a substantially U-shaped cross section, and a fixing member 2 projecting vertically in the axial direction is integrally provided with the case 5 at a substantially central portion of the bottom surface.

Further, the plunger 4 has a columnar shape, and a protrusion 41 that protrudes toward the fixing member side is provided at substantially the center of the end surface on the fixing member 2 side.

An annular upper plate 7 as a yoke member for guiding a magnetic path from the case 5 to the plunger 4 is provided above the coil 3 so as to face the side surface of the plunger 4. Further, a stopper 8 is provided which is in contact with the upper end surface of the upper plate 7 on the side opposite to the fixing member 2 and which restricts the axial movement of the plunger 4, and the upper plate 7 and the stopper 8 are provided on the case 5. It is fixed by caulking at the open end.

The stopper 8 is made of a non-magnetic material and has a disk shape reaching the inner peripheral surface of the case 5. A central portion thereof, that is, a portion for restricting the axial movement of the plunger 4 is in a direction opposite to the axial fixing member 2. A convex portion 9 is provided as a protruding portion that protrudes to. Then, a part of the plunger 4 can be housed in the convex portion 9.

The solenoid 1 is a solenoid valve as shown in FIG. That is, the plunger 4 forms a valve body, the fixing member 2 forms a valve seat, and the fixing member 2 forming a valve seat is provided with a flow path 10 that opens on the side of the plunger 4. Then, by exciting the coil 3, an open-loop magnetic path is formed from the case 5, the upper plate 7, and the fixing member 2, the plunger 4 is magnetically attracted to the fixing member 2, and the protrusion of the plunger 4 is generated. The portion 41 contacts the fixing member 2 to close the flow path 10.

On the other hand, when the coil 3 is de-excited, the magnetic attraction force between the plunger 4 and the fixing member 2 disappears, and the pressure of the fluid from the flow path 10 pushes the plunger 4 to open the flow path 10. At this time, the end surface of the plunger 4 on the side opposite to the fixing member 2 contacts the end surface of the convex portion 9 of the stopper 8, and a part of the plunger 4 is housed in the convex portion 9. As shown in FIG. 2, the length of the convex portion 9 in which a part of the plunger 4 is housed protrudes to the side opposite to the fixing member 2, and when the plunger 4 comes into contact with the fixing member 2 by the magnetic attraction force, the valve is closed. Then, the end surface of the plunger 4 opposite to the fixing member 2 is set to be at least flush with the upper end surface of the upper plate 7.

In the solenoid having the above structure, the stopper 8 is provided with a convex portion 9 projecting to the side opposite to the fixing member 2 in a portion of the stopper 4 that restricts the axial movement of the plunger 4, and the plunger 9 is provided in the convex portion 9. Since the plunger 4 is housed in the convex portion 9 when the coil 3 is not excited, when the coil 4 is excited, the plunger 4 moves to the fixed member 2 side due to the magnetic attraction force. As it moves from the housed position, the end face of the plunger 4 opposite to the fixing member 2 is at least flush with the upper end face of the upper plate 7, as shown in FIG. The length of the part that faces is unchanged. As a result, the area where the upper plate 7 and the plunger 4 overlap does not change, so the magnetic path area does not change, and the loss of the magnetic attraction force can be reduced, and the performance can be improved.

Further, unlike the prior art, it is not necessary to increase the thickness of the upper plate 7 in order to obtain the required magnetic attraction force, and the solenoid 1 can be downsized as compared with the prior art.

[0018]

[Effect of the device]

 The present invention has the above-described configuration and operation, and has a projecting portion that projects the portion of the stopper member that restricts the movement of the movable member in the axial direction toward the side opposite to the axial fixing member. Since the movable member can be stored, the movable member is housed in the above-mentioned protruding portion when the coil is not excited, so that when the movable member moves to the fixed member side by the magnetic attraction force when the coil is excited, it moves from the housed position. Therefore, the length of the portion of the yoke member facing the side surface of the movable member does not change, that is, the overlapping area of the yoke member and the movable member does not change, and the magnetic path area does not change. Therefore, the loss of the magnetic attraction force can be reduced and the performance can be improved.

Further, unlike the prior art, it is not necessary to increase the thickness of the yoke member in order to obtain the required magnetic attraction force, and the size can be reduced as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is a vertical cross-sectional view of a conventional solenoid.

FIG. 4 is an enlarged vertical sectional view of a main part of FIG.

[Explanation of symbols]

 1 Solenoid 2 Fixed Member 3 Coil 4 Plunger (Movable Member) 41 Projection 5 Case 6 Sleeve 7 Upper Plate (Yoke Member) 8 Stopper (Stopper Member) 9 Projection (Projection) 10 Flow Path

Claims (1)

[Scope of utility model registration request] 1. A fixed member made of a magnetic material, a movable member made of a magnetic material arranged coaxially with the fixed member, a coil arranged so as to surround the fixed member, and a side opposite to the fixed member. And a stopper member for restricting the movement of the movable member in the axial direction, and a magnetic flux generated by energizing the coil, the magnetic member being in contact with the end surface of the stopper member and facing the side surface of the movable member. A yoke member that guides to
In the solenoid provided with, a protrusion that protrudes a portion of the stopper member that restricts the axial movement of the movable member toward the side opposite to the axial fixing member is provided, and the movable member can be housed in the protrusion. Solenoid characterized by.