JP4275307B2 - Proportional solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a proportional solenoid valve that controls pressure and flow rate.
[0002]
[Prior art]
Conventionally, when performing pressure control with high accuracy, a proportional solenoid valve 501 is used as shown in FIG. 5, and the proportional solenoid valve 501 has a high output pressure from the output port 502 when not energized. There are two types: a normally high (N / H) type and a normally low (N / L) type (not shown) with a low output pressure when not energized.
[0003]
The proportional solenoid valve 501 includes a cylindrical cover 511, a yoke 513 with a hook inserted in a lower portion of the cover 511, a nozzle 512 having a hook portion crimped to the cover 511, the flange 515 sandwiched between the bracket 519, A solenoid 514 fitted over the yoke 513, a plunger 515 disposed in the solenoid 514 so as to be movable up and down, a core 517 with a flange 516 inserted in the upper part of the solenoid 514, and the core 517 The edge part is comprised by the cover plate 518 crimped by the said cover 511 in the laminated | stacked state.
[0004]
A coil spring 521 is disposed in the core 517, and the plunger 515 is configured such that the valve portion 523 at the lower end of the rod 522 extending downward closes the flow hole 524 of the nozzle 512. Has been. When the solenoid 514 is energized, the magnetic flux generated from the solenoid 514 surrounds the core 517 fitted in the solenoid 514, the plunger 515 facing the suction surface 525 of the core 517, and the plunger 515. The yoke 513, the cover 511 to which the yoke 513 is fixed, and the core 517 fixed to the cover 511 are configured to loop.
[0005]
As a result, a suction force proportional to the solenoid current is generated between the suction surface 525 of the core 517 and the plunger 515, and the plunger 515 is sucked into the suction surface 525 to open the flow hole 524, The original pressure from the input port 531 is discharged from the drain port 532 so that the output pressure from the output port 502 can be controlled.
[0006]
[Problems to be solved by the invention]
However, in such a proportional solenoid valve 501, in order to obtain an output pressure proportional to the solenoid current, higher dimensional accuracy is required compared to a duty valve or an on / off valve. In particular, the core 517 and the yoke 513 whose positional relationship has a great influence on the performance are fixed via the cover 511 that constitutes the outer shape of the main body, are easily affected by the assembly, and have a trouble in assembly. .
[0007]
This invention is made | formed in view of such a conventional subject, and it aims at providing the proportional solenoid valve which can improve assembly workability | operativity.
[0008]
[Means for Solving the Problems]
In the present onset Ming proportional solenoid valve in order to solve the above problems, the core and, the plunger is attracted to the core, disposed in the yoke and is in a solenoid for magnetic passing from the side surface of the plunger In the proportional solenoid valve that operates the plunger by the magnetic force from the solenoid and opens and closes the flow path by a valve portion extending from the plunger, the core and the yoke are arranged in the solenoid. It is connected in a state of being positioned by a cylindrical guide made of a non-magnetic material, and the plunger is held between the core and the yoke, and the valve portion is projected from at least the core or the yoke, and the core. with configuring the assembly member by integrating said yoke, said guide end peripheral surface of the core and the yoke is recessed stepped portions fitted around said guide While maintained and fixed separation distance of the core and the yoke constant in a state of a part press-fitted to the back of the step portion and the yoke of the core, configured such that the valve portion is protruded from the core The first assembly member or the second assembly member configured such that the valve portion protrudes from the yoke can be disposed in the solenoid, and the first assembly member or the second assembly member can be disposed in the solenoid. Any one of the assembly members was selectively disposed in the solenoid.
[0009]
That is, the core that attracts the plunger and the yoke that transfers magnetism from the side surface of the plunger are connected in a state of being positioned by the guide. Thereby, the positional relationship between the core and the yoke, which greatly affects the performance, and the positional relationship between the both and the plunger are appropriately maintained. Moreover, since this guide is made of a non-magnetic material, it is possible to eliminate an adverse effect on the plunger that operates by electromagnetic action from the solenoid.
[0010]
Further, since the assembly member is formed by integrating the core and the yoke, which have a great influence on the performance, it is easy to assemble the core, the yoke and the plunger into the solenoid. The valve portion of the plunger protrudes from at least the core or the yoke of the assembly member, so that the performance evaluation of the assembly member alone can be performed.
[0012]
The assembly member is formed by press-fitting and fixing a step portion formed at the end portion of the core and a step portion formed at the end portion of the yoke into a cylindrical guide, It is accommodated in a space surrounded by the core, yoke and guide. This facilitates quality control such as prevention of contamination (dust, dust, etc.) between the core and the plunger and between the plunger and the yoke.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
[0014]
A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a proportional solenoid valve 1 according to the present embodiment, and the proportional solenoid valve 1 controls pressure and flow rate with high accuracy.
[0015]
FIG. 1 shows a normally high (N / H) type proportional solenoid valve 1 having a high output pressure when not energized. The proportional solenoid valve 1 is a metal cover 11 made of a magnetic material. It has. The cover 11 is formed in a cylindrical shape and constitutes the outer peripheral portion of the proportional solenoid valve 1. A resin molding member 12 is fitted in the cover 11, and a metal bracket 13 is insert-molded in the molding member 12.
[0016]
The molded member 12 has a cylindrical bobbin 21 fitted into the cover 11 at the upper part with the bracket 13 as a boundary. A coil 22 is wound around the bobbin 21 to form a solenoid 23. Has been. The molding member 12 includes a nozzle 24 having a lower portion with the bracket 13 as a boundary extending downward from the cover 11. The nozzle 24 has a ring plate having a through hole 25. A sheet 26 is insert-molded. An output port 27 that opens downward is formed in the lower portion of the seat 26, and an input port 28 that opens to the side communicates with the output port 27. In addition, a valve chamber 29 is formed in the upper portion of the seat 26, and the valve chamber 29 communicates with a drain port 30 that opens to the side.
[0017]
A sub-assembled assembly member 31 is fitted inside the bobbin 21. The assembly member 31 is placed on the edge of the central hole 32 in a state where the central hole 32 of the bracket 13 is inserted, and the lower end of the cover 11 is bent inward. The lower caulking portion 33 is fixed. A ring plate-like cover plate 34 is placed on the upper end of the assembly member 31. The cover plate 34 is fixed by an upper caulking portion 35 formed by bending the upper end of the cover 11 inward. Yes. Thereby, the assembly member 31 is fixed in a state of being sandwiched between the bracket 13 and the cover plate 34.
[0018]
As shown in FIG. 2, the assembly member 31 includes a yoke 41 supported by the bracket 13, a guide 42 fitted on the upper end of the yoke 41, and a lower end fitted on the upper portion of the guide 42. A plunger 43 is held in an inner space 44 surrounded by the core 43, the guide 42 and the yoke 41 so as to be movable up and down.
[0019]
The plunger 51 is fixed to the plunger 45 with the rod 51 penetrating therethrough, and the upper projecting portion 52 is supported by the core 43 through the bush 53 so as to be movable up and down. The downward projecting portion 54 of the rod 51 is supported by the yoke 41 via a bush 55 so as to be movable up and down, and the lower end portion of the assembly 51 is inserted through the insertion hole 56 of the yoke 41. It protrudes further downward. A small-diameter portion 57 is formed in the upward projecting portion 52, and a coil spring 58 is fitted on the small-diameter portion 57. As a result, the plunger 45 is biased downward, and the valve portion 59 formed at the lower end of the rod 51 is inserted into the nozzle 24 at the normal time when the energization to the solenoid 23 is cut off. The flow hole 25 of the formed sheet 26 is closed.
[0020]
The core 43 is formed of a magnetic material excited by the solenoid 23, and the core 43 is formed with a suction surface 61 that sucks the upper end of the plunger 45 when excited. As a result, when the solenoid 23 is energized, the plunger 45 biased by the coil spring 58 is actuated upward, and the flow hole 25 of the seat 26 closed by the valve portion 59 at the lower end of the rod 51. Can be released in proportion to the solenoid current. A convex portion 62 is formed at the center of the upper end portion of the core 43 so that the cover plate 34 can be positioned. In addition, a stepped portion 63 on which the guide 42 is fitted is recessed in the peripheral surface of the lower end portion of the core 43. With the stepped portion 63 being press-fitted and fixed to the guide 42, the side surface of the core 43 and the guide 42 side surfaces are set to be flush with each other.
[0021]
The yoke 41 is also formed of a magnetic material. The yoke 41 surrounds the plunger 45 from the side, and a cylindrical magnet that transfers magnetism from the plunger 45 from the side surface of the plunger 45. A delivery part 71 is formed. A step portion 72 on which the guide 42 is fitted is recessed on the peripheral surface of the upper end portion of the yoke 41, and the side surface of the yoke 41 and the side surface of the guide 42 are fixed with the step portion 72 being press-fitted and fixed to the guide 42. And are set to be the same. A positioning recess 73 is formed on the peripheral surface of the upper end portion of the core 43 and is positioned in a state of being fitted in the bracket 13.
[0022]
The guide 42 is formed of a non-magnetic material, and is formed in a cylindrical shape that can be fitted onto the core 43 and the step portions 63 and 72 of the yoke 41. Thus, the core 43 and the yoke 41 are connected and integrated.
[0023]
In the present embodiment according to the above configuration, the core 43 that attracts the plunger 45 and the yoke 41 that transfers magnetism from the side surface of the plunger 45 are in a state in which the step portions 63 and 72 are press-fitted into the guide 42. , Maintained at a predetermined separation distance. Thereby, the positional relationship between the core 43 and the yoke 41 and the positional relationship between the plunger 45 and the core 43 can be appropriately maintained. For this reason, the performance can be maintained without being affected by the assembly as compared with the conventional case where the core 43 and the yoke 41 are positioned via the cover 11 constituting the outer shape of the proportional solenoid valve 1. it can. Since the guide 42 is made of a non-magnetic material, it is possible to eliminate an adverse effect on the plunger 45 that is operated by the electromagnetic action from the solenoid 23.
[0024]
Also, since the assembly member 31 is formed by integrating the core 43 and the yoke 41 which greatly affect the performance, the core 43, the yoke 41, and the plunger can be simply disposed by placing the assembly member 31 in the solenoid 23. 45 can be assembled into the solenoid 23. Therefore, since the core 43 and the yoke 41 are fixed via the cover 11, the assembly of the yoke 41 to the cover 11 and the assembly of the core 43 must be performed carefully compared to the conventional case. Workability can be improved.
[0025]
A rod 51 of a plunger 45 projects from the yoke 41 of the assembly member 31, and a lower end of the rod constitutes a valve part 59. For this reason, the performance evaluation of the said assembly member 31 can be performed alone. Therefore, in the stage before assembly, defective products can be eliminated, and loss when a defect occurs can be minimized.
[0026]
Further, the assembly member 31 is formed by press-fitting and fixing a stepped portion 63 formed at the end of the core 43 and a stepped portion 72 formed at the end of the yoke 41 to the cylindrical guide 42. The plunger 45 is accommodated in an internal space 44 surrounded by the core 43, the yoke 41 and the guide 42. Therefore, quality control such as prevention of contamination (dust, dust, etc.) from entering the core 43 and the plunger 45 and between the plunger 45 and the yoke 41 is facilitated. Furthermore, since the end of the core 43 and the end of the yoke 41 are press-fitted into the cylindrical guide 42, the coaxiality of the core 43 and the yoke 41 can be ensured. Thereby, it can contribute to performance improvement.
[0027]
In addition, the protrusions of the guide 42 from the side surfaces of the yoke 41 and the core 43 can be suppressed by providing stepped portions 63 and 72 on the peripheral surfaces of the yoke 41 and the core 43 to which the guide 42 is fitted. Can do. Thereby, compared with the case where the said guide 42 protrudes to the side, the interference to the inner surface of the solenoid 23 can be prevented, and the assembling work is facilitated.
[0028]
(Second Embodiment)
[0029]
3 and 4 are diagrams showing a proportional solenoid valve 101 according to the second embodiment of the present invention, and only different portions from the first embodiment will be described.
[0030]
That is, in FIG. 3, and the non-output pressure at Energized low Nomarirou (N / L) Type of the proportional solenoid valve 101 is shown, A the proportional solenoid valve 101 is housed within the solenoid 23 Tsu Except for the assembly member 111, the same member as in the first embodiment is used.
[0031]
As shown in FIG. 4, the assembly member 111 includes a core 121 supported by the bracket 13, a guide 122 fitted on the upper end of the core 121, and a lower end fitted on the guide 122. A plunger 123 is held in an internal space 124 surrounded by the yoke 123, the guide 122, and the core 121 so as to be movable up and down. That is, compared with the first embodiment, the core 121 is set at the lower part and the yoke 123 is set at the upper part.
[0032]
The plunger 125 is fixed in a state of penetrating the rod 131, and the upper projecting portion 132 is supported by the yoke 123 through the bush 133 so as to be movable up and down. Further, the downward projecting portion 134 of the rod 131 is supported by the core 121 via the bush 135 so as to be movable up and down, and the lower end portion thereof is supported by the assembly member 111 via the insertion hole 136 of the core 121. It protrudes further downward. The plunger 125 is configured to release the flow hole 25 by moving upward in response to pressure from the input port 28 at a normal time when the energization of the solenoid 23 is interrupted.
[0033]
The core 121 is formed of a magnetic material excited by the solenoid 23, and the core 121 is formed with a suction surface 141 that sucks the lower end of the plunger 125 when excited. Thus, when the solenoid 23 is energized, the plunger 125 that has been moved up by the fluid pressure is actuated downward, and the valve hole 137 at the lower end of the rod 131 causes the flow hole 25 of the seat 26 to be proportional to the solenoid current. And can be closed. A stepped portion 142 into which the guide 122 is fitted is recessed in the peripheral surface of the upper end portion of the core 121. With the stepped portion 142 being press-fitted and fixed to the guide 122, the side surface of the core 121 and the side surface of the guide 122 And are set to be the same. A positioning recess 143 is formed on the peripheral surface of the lower end portion of the core 121 so as to be positioned while being fitted in the central hole 32 of the bracket 13.
[0034]
The yoke 123 is also formed of a magnetic material. The yoke 123 surrounds the plunger 125 from the side, and a cylindrical magnet that transfers the magnetism from the plunger 125 from the side surface of the plunger 125. A delivery unit 151 is formed. A step portion 152 to which the guide 122 is fitted is recessed in the peripheral surface of the lower end portion of the yoke 123. With the step portion 152 being press-fitted and fixed to the guide 122, the side surface of the yoke 123 and the side surface of the guide 122 are provided. And are set to be the same. A convex portion 153 is formed at the center of the upper end portion of the yoke 123 so that the cover plate 34 can be positioned.
[0035]
The guide 122 is formed of a non-magnetic material, and is formed in a cylindrical shape that can be fitted onto the core 121 and the step portions 142 and 152 of the yoke 123. Accordingly, the core 121 and the yoke 123 can be connected and integrated.
[0036]
Also in the present embodiment according to the above configuration, the same effect as in the first embodiment can be obtained.
[0037]
Moreover, in this way simply by changing the A Tsu Senburi member 111 accommodated in the solenoid 23, it is possible to form different types of proportional solenoid valve 101. As a result, it is possible to share components other than the assembly members 31 and 111 between the proportional solenoid valves 1 and 111 of different types, and a significant reduction in cost can be achieved.
[0038]
【The invention's effect】
As described above, in the proportional solenoid valve according to claim 1 of the present invention, the core and yoke are connected to each other with respect to the positional relationship between the core and the yoke and the positional relationship between the plunger and the plunger that greatly affects the performance. Can be kept appropriate with the guide. As a result, the performance can be maintained without being affected by the assembly as compared with the conventional case where the core and the yoke are positioned via the cover constituting the outer shape of the main body.
[0039]
Further, the assembly work can be performed only by disposing the assembly member in which the core and the yoke are integrated in the solenoid. Therefore, since the core and the yoke are fixed through the cover, the assembly workability is improved as compared with the conventional case where the yoke must be assembled to the cover and the core must be assembled carefully. Can do.
[0040]
And the valve part of a plunger protrudes from the said core or the said yoke at least of this assembly member, and the performance evaluation of the said assembly member can be performed alone. As a result, defective products can be eliminated in the pre-assembly stage, so that the loss at the time of the occurrence of defects can be minimized.
Further, only by changing the A Tsu Senburi member housed in the solenoid, it is possible to form different types of proportional solenoid valve. As a result, it is possible to share components other than the assembly member between different types of proportional solenoid valves, and to achieve a significant cost reduction.
[0041]
Also, the pre-Symbol plunger, since the housed core and yoke and a cylindrical guide enclosed space between the core and the plunger, and into between the plunger and the yoke contamination (dust, dirt, etc.) Quality control such as entry prevention can be performed easily. Furthermore, since the core end and the yoke end are press-fitted into the cylindrical guide, the coaxiality of the core and the yoke can be ensured. Thereby, it can contribute to performance improvement.
[0042]
And the protrusion amount of the said guide from the said yoke and the said core side surface can be suppressed by providing a step part in the surrounding surface of the said yoke and the core which a guide fits. Thereby, compared with the case where the said guide protrudes to the side, the assembly | attachment operation | work in a solenoid becomes easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a sectional view showing the assembly member of the embodiment.
FIG. 3 is a cross-sectional view showing a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing the assembly member of the embodiment.
FIG. 5 is a cross-sectional view showing a conventional proportional solenoid valve.
[Explanation of symbols]
1 Proportional solenoid valve 23 Solenoid 25 Flow hole 31 Assembly member 41 Yoke 42 Guide 43 Core 45 Plunger 59 Valve part 61 Suction surface 63 Step part 72 Step part 101 Proportional solenoid valve 111 Assembly member 121 Core 122 Guide 123 Yoke 125 Plunger 137 Valve portion 141 Suction surface 142 Step portion 152 Step portion

Claims (1)

A core, a plunger attracted by the core, and a yoke for transferring magnetism from a side surface of the plunger are disposed in the solenoid, and the plunger is operated by a magnetic force from the solenoid, and the plunger In the proportional solenoid valve that opens and closes the flow path with the valve part extending from
The core and the yoke are connected in a state where they are positioned by a cylindrical guide made of a non-magnetic material disposed in the solenoid, and the plunger is held between the core and the yoke, and at least the valve portion is with configuring the assembly member by integrating with the said core yoke in a state of protruding from the core or the yoke,
The core and the yoke are recessed in a stepped portion on which the guide is fitted, and the end of the guide is press-fitted into the stepped portion of the core and the stepped portion of the yoke. While maintaining a fixed distance between the yoke and the yoke,
A first assembly member configured such that the valve portion protrudes from the core or a second assembly member configured such that the valve portion protrudes from the yoke is configured to be disposed in the solenoid. In addition, the proportional solenoid valve is characterized in that either the first assembly member or the second assembly member is selectively disposed in the solenoid.

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