JPH074972U - Solenoid valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the mounting accuracy of the solenoid without requiring the dimensional accuracy of the components of the solenoid. [Structure] The magnetic path forming member 10A of the solenoid 11 is characterized by being expandable and contractable in the length direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve used for controlling various oils and air pressures, for example.

[0002]

[Prior art]

 A conventional solenoid valve of this type is shown in FIG. That is, the solenoid valve 100 includes a valve body 104 having an insertion portion 103 to be inserted into a pressure port 102 opening in a valve mounting unit 101, and a valve body 104 integrally assembled with the valve body 104. A solenoid main body 106 including a fixed member 113 made of a magnetic material for driving 105, a movable member 114 made of a magnetic material, and a coil 115, an inner hollow case 107 surrounding a coil 115 of the solenoid main body 106 and its A magnetic path forming member 100A including plates A, B 108 and 109 which are yoke members provided at both ends of the case 107 in the axial direction.

Then, as shown in FIG. 7, two or more (three in the conventional example) insertion portions 103 of the valve body 104 are inserted into the pressure valve 110 of the valve mounting unit 101 in the same valve mounting unit 101, and the plate is inserted. The solenoid body 106 is attached by sandwiching the plurality of solenoids 106A surrounded by the case 107 and the plates A, B 108 and 109 by 111 and bolts 112.

The case 107 has a cylindrical shape as shown in FIG.

[0005]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, in order to prevent the gap Z (see FIG. 7) from being generated between the solenoid 106A and the plate 111 surrounded by the respective cases 107 and the plates A, B 108, 109, the solenoids 106A are Height accuracy was needed. Since the height of the solenoid 106A in this case is a plurality of component parts (sum of the heights of the dimensions of the case 107, the plates A, B 108, and 109), dimensional accuracy is required for each component part.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to improve the mounting accuracy of the solenoid without requiring the dimensional accuracy of the components of the solenoid. To provide a solenoid valve.

[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 which is arranged coaxially with the fixing member, and the fixed member are installed. A solenoid valve including a coil disposed so as to surround the coil and a magnetic path forming member that surrounds the coil, and a valve body that operates using the solenoid. The feature is that it can be expanded and contracted in the length direction.

[0008]

[Action]

 In the solenoid valve with the above configuration, the magnetic path forming member that surrounds the solenoid coil is made expandable and contractable in the longitudinal direction, so that when mounting multiple solenoids between the valve mounting unit and the plate as in the past, , Tighten with bolts The magnetic force forming member expands and contracts in the length direction due to the tightening force, eliminating the gap between the solenoid and the plate and making the height of the solenoid the same, so the dimensional accuracy of the components of the solenoid is required. The mounting accuracy is improved without doing this.

[0009]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 showing a solenoid valve according to an embodiment of the present invention, reference numeral 1 denotes an entire solenoid valve, which is provided between a valve mounting unit 3 having a pressure port 2 and a plate 4. It is attached by being clamped by bolts 5.

This solenoid valve 1 is roughly composed of a valve main body 7 having an insertion portion 6 inserted into the pressure port 2 of the valve mounting unit 3, and a valve main body 7 in which the valve main body 7 is integrally incorporated. The solenoid 11 is composed of a solenoid body 9 for driving the valve body 8 and a magnetic path forming member 10A surrounding the coil 18 of the solenoid body 9.

The valve body 7 has a cylindrical body 12 having an inner diameter of a small diameter portion 12A and a large diameter portion 12B, and a valve seat 13 which is a valve seat fitted and fixed to the inner circumference of the small diameter portion 12A. A spherical valve body 15 that opens and closes the flow path 14 that opens and closes to the valve seat 13 and that is fixed to the valve seat 15 is fixed to the inner periphery of the small diameter portion 12A of the body 12. And a rod 17 that reciprocates via a bearing 16 that is provided.

Further, the solenoid body 9 is housed in a case 10 made of a magnetic material having a hollow inside, and generally, a cylindrical cap 20 as a fixing member made of a magnetic material and a cap 20 coaxially face each other. It is composed of a plunger 21 as a movable member made of a magnetic material that is reciprocally inserted, and a coil 18 arranged so as to surround the cap 20 via the plunger 21 and the sleeve 19. That is, the case 10 surrounds the coil 18.

A portion of the body 12 of the valve body 7 whose inner diameter is the large diameter portion 12B is inserted into the inner circumference of the coil 18, and the body 12 and the sleeve 19 of the solenoid body 9 are connected to the cylinder 22. The valve body 7 is coaxially assembled to the solenoid body 9 by being connected and fixed via.

By being assembled in this manner, the plunger 21 can reciprocate in the large diameter portion 12B of the body 12. The plunger 21 has a cylindrical shape with a bottom, is provided such that the opening is on the side of the cap 20, and the rod 17 is operatively connected thereto. A spherical valve body 15 is fixed to the tip of the rod 17. The other end of the rod 17 passes through the inner circumference of the cap 20 and is held via a bearing 23 fitted and fixed in the cap 20.

A spring 24 is interposed between the bearing 23 and the plunger 21 and on the outer circumference of the rod 17. One end of the spring 24 abuts on the end face of the bearing 23, and the other end abuts on the bottom of the plunger 21 to urge the plunger 21 toward the valve body 7.

Further, an annular plate that is a yoke member that guides the magnetic path from the case 10 to the plunger 21 and the cap 20 at both ends in the length direction of the case 10 that houses the solenoid body 9, that is, in the height direction. A, B25 and 26 are provided, and the case 10 and the plates A, B25 and 26 are the magnetic path forming member 10A.

Filters 27 and 27 ′ are provided at the open end of the body 12 of the valve body 7 and the open end of the sleeve 19 of the solenoid body 9, respectively.

When the solenoid 11 is off, the spring force of the spring 24 interposed between the plunger 21 and the bearing 23 moves the plunger 21 to the valve body 7 side, and the tip of the rod 17 operatively connected to the plunger 21. The valve body 15 provided in the valve contacts the valve seat 13 and the flow path 14 is closed.

Next, when the solenoid 11 is turned on, the plunger 21 is magnetically attracted to the cap 20 against the spring force of the spring 24, and the valve body 15 provided at the tip of the rod 17 operatively connected to the plunger 21. Separates from the valve seat 13 and opens. Therefore, the fluid flows through the flow path 14 through the filter 27 of the valve body 7, and then flows out through the holes provided in the bearing 16, the plunger 21 and the bearing 23, and the filter 27 of the solenoid body 9.

In the solenoid valve 1 configured as described above, the small diameter portion 12A having a small inner diameter of the body 12 of the valve body 7 is arranged in the pressure port 2 of the valve mounting unit 3 as shown in FIG. The plate B26 is inserted until the end face of the plate B26 comes into contact with the end face of the valve mounting unit 3. That is, the small-diameter portion 12A of the body 12 and the valve seat 13, the bearing 16 and the like located in the small-diameter portion 12A serve as the inserting portion 6 and are inserted into the pressure port 2, and the plate 4 is formed on the plate 4. The sleeve 19 of the solenoid 11 is inserted into the formed hole 28, brought into contact with the end surface of the plate A25 of the solenoid 11, and the solenoid 11 is clamped and fixed by the bolts 5 at both ends in the radial direction.

Here, the case 10 of the magnetic path forming member 10A which is an elastic member in the length direction according to the present invention will be described.

As shown in FIG. 2, the case 10 has a cylindrical shape, and has a so-called vertical sliding shape that is cut out over a part of the entire length in the circumferential direction. And is vertically displaced in the length direction, and has a deformation amount of dimension x. By providing the slits in this way, flexibility is imparted in the length direction, and it is possible to expand and contract. Therefore, when the solenoid 11 is tightened between the plate 4 and the valve mounting unit 3 by the bolt 5, the case 10 expands and contracts within the area of the dimension x, so that the gap between the solenoid 11 and the plate 4 can be prevented. The deformation amount x is determined by the following.

First, assuming that the dimensional tolerance of the total heights of the plates A, B 25, 26 and the case 10 is α, it is sufficient to absorb the tolerance in order to prevent a gap due to the dimensional tolerance α. Equation 1 of

[0024]

[Equation 1] Further, in order to prevent a gap due to deformation due to pressure (force) being applied to the case 10, it suffices if the deformation can be absorbed, so the force acting on the case 10 is F and the pressure is P. Assuming that the pressure receiving area is S, the formula for obtaining the force F acting on the case 10 is the following formula 2.

[0025]

[Equation 2] Then, when the constant of case 10 is K, the plate thickness is d, the length, that is, the height is H, the average diameter is D, and the transverse coefficient is G, the equation for obtaining the constant K is the following Equation 3.

[0026]

[Equation 3] From the above Expression 3, the following Expression 4 is obtained.

[0027]

[Equation 4] N in the equation 4 is a safety factor. Then, from Expression 3 and Expression 4, the following Expression 5 is obtained.

[0028]

[Equation 5] Therefore, it suffices if x is set to a value that satisfies both Expression 1 and Expression 5 above.

Specific dimensions will be described below.

As shown in FIG. 3, the solenoid valve 1 having the above structure is inserted into the pressure port 3 until the end face of the plate B 26 comes into contact with the end face of the valve mounting unit 3, and the plate 4 is opened. The sleeve 19 of the solenoid 11 is inserted into the valve 28, and the plate 4 is tightened with the bolt 5 to clamp and fix the solenoid 11. The sleeve 19 and the plate A25 are fixed by brazing. As the case 10, the case 10A shown in FIG. 4 is used. Incidentally, the case 10A shown in FIG. 4 is a schematic representation, and in reality, a seat is provided as shown in FIG. 2, and x shown in FIG. 2 is obtained by the following. is there.

In this case 10A, the plate thickness d = 1.15 mm, the height H = 20.99 mm, the average diameter D 2 = 22.85 mm, and the crossing coefficient G is iron G = 0.83 × 10 ⁴ kgf / mm ² . Then, a case where the maximum hydraulic pressure of 250 kgf / cm ^{2 is} generated from the pressure port 2 toward the insertion portion 6 of the valve body 7 will be described. The diameter D'of the insertion portion 6 serving as the pressure receiving portion is φ11 mm. Therefore, the pressure receiving area S is

[0032]

[Equation 6] Therefore, the force F applied to the insertion portion 6 which is the pressure receiving portion is P = 250 kgf / cm ² and S = 0.95 cm ² from the above conditions, and therefore F = 238 kgf from the above mathematical expression 2. Next, in order to obtain the constant K of the case 10A, substituting the conditions G 1, d, H, and D of the case 10A into the above equation 3, K = 2791 kgf / mm. Since the x does not have the total dimensional tolerance α of the heights H of the plates A, B 25, 26 and the case 10, the above equation 4 becomes the following equation 7.

[0033]

[Equation 7] Therefore, when the safety factor N is quadrupled, x = 0.34 mm is obtained from the above formula 7. X is obtained by adding (± α) the dimensional tolerance α 1 of the total height of the plates A, B 25, 26 and the case 10 to this value. Since such a small value can prevent the gap between the plate A25 and the plate 4, there is no problem in space.

In the solenoid valve having the above-described configuration, since the case 10 is provided with the slot and has the dimension x satisfying the above-described mathematical expressions 1 and 5 in the lengthwise direction, the plates A, B 25, 26 Also, the tolerance of the total height of the case 10 can be absorbed, and the deformation when the pressure is applied to the case 10 can also be absorbed. Therefore, as shown in FIG. 7 shown in the prior art, the case 10 expands and contracts in the length direction, that is, the height direction by the tightening force of arranging two or more pieces on the same valve mounting unit 3 and tightening them with the bolt 5 via the plate 4. Since the clearance is eliminated and the height of the solenoid 11 is the same, the mounting accuracy can be improved without requiring the dimensional accuracy of the component parts of the solenoid 11.

In the present embodiment, since the case 10 is provided with a slot, the contact with the plates A, B 25, 26 becomes a partial contact, and the magnetic flux is lost. Since the magnetic flux concentrates on the path of the magnetic path, there is little loss.

In the above-mentioned embodiment, the case where the case 10 is provided with a slot for allowing the magnetic path forming member 10A to expand and contract has been described as an example. However, the present invention is not limited to this. The plate A, B25, 26 of the member 10A may be provided with a slot or the like so as to be extendable / contractible in the length direction, and further, an elastic member made of a magnetic material may be provided in the middle of the case 10 in the length direction. good.

[0037]

[Effect of device]

 According to the present invention having the above-described configuration and operation, the magnetic path forming member that surrounds the coil of the solenoid can be freely expanded and contracted in the length direction, so that a plurality of solenoids can be mounted between the valve mounting unit and the plate as in the conventional case. When sandwiched and attached to, the magnetic path forming member expands and contracts in the lengthwise direction by the tightening force of the bolts so that there is no gap between the solenoid and the plate and the height of the solenoid is the same. Therefore, the mounting accuracy can be improved without requiring the dimensional accuracy of the solenoid component parts.

[Brief description of drawings]

1A is a vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention, and FIG. 1B is a right side view of FIG. 1A.

2 (a) is a front view of a case of the solenoid valve of FIG. 1, and FIG. 2 (b) is a top view of FIG. 2 (a).

FIG. 3 is a simplified cross-sectional view showing a state where the solenoid valve of FIG. 1 is sandwiched and mounted between a valve mounting unit and a plate.

FIG. 4 is a schematic view of a case, FIG. 4A is a front view, and FIG. 4B is a top view.

5 (a) is a vertical sectional view of a conventional solenoid valve, and FIG. 5 (b) is a right side view of FIG. 5 (a).

6 (a) is a front view of the case of the solenoid valve of FIG. 5, and FIG. 6 (b) is a top view of FIG. 6 (a).

FIG. 7 is a simplified cross-sectional view showing a state where two or more solenoid valves of FIG. 5 are mounted side by side between a valve mounting unit and a plate.

[Explanation of symbols]

 1 Solenoid Valve 2 Pressure Port 3 Valve Mounting Unit 4 Plate 5 Bolt 6 Insertion Part 7 Valve Main Body 8 Valve Body 9 Solenoid Main Body 10 Case 10A Magnetic Path Forming Member 11 Solenoid 12 Body 12A Small Diameter Part 12B Large Diameter Part 13 Valve Seat 14 Flow Path 15 valve body 16 bearing 17 rod 18 coil 19 sleeve 20 cap (fixed member) 21 plunger (movable member) 22 cylinder 23 bearing 24 spring 25 plate A 26 plate B 27, 27 'filter 28 hole

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 which is arranged coaxially opposite to the fixed member, a coil arranged so as to surround the fixed member, and the coil. A solenoid valve comprising a solenoid having a magnetic path forming member that surrounds it and a valve body that operates using the solenoid, wherein the magnetic path forming member is extendable in the longitudinal direction. Solenoid valve.