JP3395236B2 - Solenoid valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve which opens and closes a valve by passing an electric current through a coil provided therein. 2. Description of the Related Art FIG. 3 is a sectional view showing an example of a conventionally proposed solenoid valve. In the figure, 10
Reference numeral 0 denotes a coil wound around a nonmagnetic bobbin 102, which is energized through a lead wire 103. The coil 100 is a housing 1 fixed to a valve seat 104.
The core 106 having a small diameter portion 106a in the lower part of the figure above the central part of the bobbin 102 in the figure.
The sleeve 107 is fitted into the small diameter portion 106a of the core 106, and is fixed by brazing. A plunger 109 which is urged by a spring 108 in a direction opposite to the core 106 and which is always stationary with a predetermined gap from the core 106 is slidably provided in the sleeve 107. A seal rubber 110 is fixed to the center of the lower end of the seal rubber 110.
Accordingly, the passage 111 provided in the valve seat 104 is always closed. 112 denotes a yoke, 113 denotes a passage communicating with a space 114 below the yoke 112 provided in the valve seat 104, 1
15 is a plate. [0003] The movement range of the plunger is between the end face of the core and the valve seat. On the other hand, in the above-mentioned conventional technique, the height of the small diameter portion 106a of the core (vertical direction in FIG. 3) and the sleeve 1
Since the height of 07 is finished to a predetermined size by cutting, a considerable error occurs. In addition, since the sleeve is fixed to the core by brazing, a floating error due to the brazing also occurs. As described above, in order to finish the moving range of the plunger to a predetermined size, the variation is large because there are many factors that cause the variation. If the amount of movement of the plunger when attracting the plunger to the core is large, a large suction force is required.When the movement range of the plunger is large due to large variation, the current value flowing through the coil is increased. I have to. [0005] It is a technical object of the present invention to provide a solenoid valve having less variation in the range of movement of a plunger. [0006] In order to solve the above-mentioned technical problems, the technical measures taken in the present invention include a bobbin made of a non-magnetic material, which is disposed in a housing and around which a coil is wound. A core positioned on one side of the center of the bobbin and constantly biased to the other side by the first biasing means, and a core slidably disposed at the center of the bobbin and slidably positioned by the second biasing means. An air passage is formed by a plunger urged in a direction away from the housing and a magnetic path forming member located outside the housing and made of a magnetic material. And a valve that connects and shuts off the plunger and the second
A configuration in which Ru and a formed housing member by a stopper portion which is positioned parallel to surface of the hollow cylindrical portion and the valve seat and the horizontal direction for accommodating the biasing means, moving the first biasing means of the plunger
In the direction between the core and the magnetic path forming member . The operation of the present invention will be described. One in the center of bobbin
On one side and always on the other side by the first biasing means.
An accommodating member comprising a core to be urged, a hollow cylindrical portion having an end surface in contact with the core and accommodating the plunger and the second urging means therein, and a stopper portion located in a plane parallel to the valve seat in the horizontal direction. Since the provision of the plunger in the predetermined range can be achieved by forming the depth of the storage member to the predetermined size, the only factor that causes the variation is the variation in the depth of the storage member. Yes, there is little variation in the range of movement of the plunger. An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a solenoid valve according to the present embodiment, and FIG. 2 is a perspective view of a housing member. In both figures, 1
Numeral 0 denotes a coil wound around a non-magnetic bobbin 11, which is energized through a conducting wire 12. Coil 10
The bobbin 11 is housed in a housing 13, and a core 14 made of a magnetic material is provided above a center portion of the bobbin 11, and a plunger 16 made of a magnetic material is provided below the housing via a housing member 15.
Are arranged. Further, on the outside of the housing 13,
First and second magnetic path forming members 17 and 18 made of two members made of metal are provided. First magnetic path forming member 1
7 is caulked and fixed to the second magnetic path forming member 18, and
The second magnetic path forming member 18 is fixed to the valve seat member 19 by bolts (not shown). Then, the first magnetic path forming member 17, the second magnetic path forming member 18, the plunger 16, the core 1
4 is formed. The core 14 is inserted in the lower part in FIG. 1 into the center of the bobbin 11, and furthermore, in the upper part in FIG.
a. A spring washer 20 as first urging means is interposed between the annular thin plate portion 14a and the first magnetic path forming member 17. The storage member 15 includes a cylindrical portion 15.
a is inserted into the center of the bobbin 11, and the stopper 15b is clamped and fixed between the second magnetic path forming member 18 and the valve seat member 19. At this time, an O-ring 21 for sealing is interposed between the stopper portion 15 b of the storage member 15 and the valve seat member 19. The plunger 16 accommodates a spring 22 as a second urging means in the center hole 16a, and is urged in a direction away from the core 14 by the spring 22.
a between the upper end surface 15c of FIG. Further, a seal rubber 23 is fixed to the lower surface at the center of the plunger 16. The seal rubber 23 of the plunger 16 is in contact with a valve seat 19 a provided on the valve body 19 to close the suction air passage 24. 25 is a discharge air passage. Incidentally, the core 14 is a cylindrical portion 1 of the storage member 15.
5a is inserted into the center of the bobbin 11 and the stopper 15
After b is fixed, it is inserted into the center of the bobbin 11 and abuts on the upper end surface 15c of the storage member 15. At this time, the first
Since the spring washer 20 is interposed between the magnetic path forming member 17 and the annular thin plate portion 14a of the core 14, the core 14 is in a state of generating a biasing force on the storage member 15, and the core 14 and the storage member 15 Is always in contact. Next, the operation of this embodiment will be described. When the coil 10 is energized, a magnetic field is generated, and the magnetic flux at this time passes through a magnetic circuit including the first magnetic path forming member 17, the second magnetic path forming member 18, the plunger 16, and the core 14. Therefore, a force is generated in a direction to reduce the magnetic resistance of the magnetic circuit, the plunger 16 is attracted to the core 14 against the urging force of the spring 22, and the seal rubber 23 is separated from the valve seat 19a and both air passages 24, 25 communicates. In this embodiment, the material of the storage member 15 is not particularly specified. However, since the storage member 15 is formed by press working, it is possible to use a highly corrosion-resistant stainless steel having difficulty in cutting. . The effects of the present invention will be described. A non-magnetic bobbin disposed in the housing and wound with a coil; and a first urging means located on one side of a center portion of the bobbin and having a first urging means.
Ri and cores other with constantly side bias, a plunger is biased away core and by slidably disposed to the second biasing means in the center of the bobbin, a magnetic located on the outside of the housing A valve for supplying air to the coil to move the plunger to move the plunger to open and close the air passage by separating and connecting the plunger and the valve seat; and a plunger having an end surface in contact with the core and the inside thereof. A solenoid member comprising: a hollow cylindrical portion for storing the second biasing means; and a storage member including a valve seat and a stopper portion positioned on a horizontal plane in parallel with each other, wherein a movement range of the plunger is provided. to finish the predetermined size, it becomes by molding the depth of the housing member to a predetermined size, as the element variation occurs, only variations in the depth of the housing member, movement of the plunger A small element of the variation in the circumference. Further, as described in the above-described embodiment, since the housing member can be formed by press forming with a short processing time, the processing time can be shortened as compared with the cutting processing. Further, as described in the embodiment, since the storage member can be formed of a highly corrosion-resistant stainless steel having difficulty in cutting, it is possible to secure the corrosion resistance at low cost as compared with the case of applying the corrosion-resistant plating. It can be carried out.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a sectional view of a solenoid valve according to the present invention. FIG. 2 shows a perspective view of a storage member. FIG. 3 shows a sectional view of a conventional solenoid valve. [Description of Signs] 10 ... coil 11 ... bobbin 13 ... housing 14 ... core 15 ... storage member 16 ... plunger 17 ... first magnetic path forming member 18 ... Second magnetic path forming member 19a Valve seat 20 Spring washer (first urging means) 22 Spring (second urging means) 23 Seal rubber 24 Air for suction Passage 25: Air passage for discharge

Claims (1)

(57) Claims 1. A non-magnetic bobbin, which is disposed in a housing and around which a coil is wound, and a first urging member located on one side of a center portion of the bobbin and A core constantly biased to the other side by means, a plunger slidably disposed at the center of the bobbin and biased in a direction away from the core by second biasing means, and an outer side of the housing. A magnetic path forming member made of a magnetic material, and a valve that conducts an electric current to the coil to move the plunger, thereby communicating and disconnecting the air passage by separating and connecting the plunger and the valve seat;
A hollow cylindrical portion having an end surface in contact with the core and housing the plunger and the second biasing means therein, and a storage member configured by a stopper portion positioned in a plane parallel to the valve seat in a horizontal direction , The first urging means is configured to
The core and the magnetic path forming member in the moving direction of the
And a solenoid valve located between the solenoid valve.