JP3016056B2 - Air gap adjustment method for normally closed solenoid valve and air gap and valve stroke adjustment method for normally open solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adjusting an air gap formed between a fixed core and a movable core of a solenoid valve, and a valve stroke formed between a tip of a valve body and a tip of a valve seat of the solenoid valve. The adjustment method.

[0002]

2. Description of the Related Art At the time of assembling a solenoid valve, temporary spacers each having a predetermined thickness are interposed between a fixed core and a movable core and between a movable core and a stopper. An air gap adjusting method for a solenoid valve in which an air gap is formed is disclosed in Japanese Patent Application Laid-Open No. 5-184.
No. 73 discloses this.

[0003]

However, in the above-mentioned conventional method, it is necessary to attach and remove the temporary spacer at the time of assembling, so that there is a problem that the number of steps is increased and the assembling work is complicated.

The present invention has been made in view of such circumstances, and has been made to reduce the air gap and valve stroke of a solenoid valve.
An object is to adjust the size to an appropriate size without using a temporary spacer.

[0005]

In order to achieve the above object, the invention described in claim 1 provides a housing comprising a housing body, a coil, a fixed core, a yoke body and a valve seat support member, a fixed core and a housing. A movable core movably disposed between the valve seat support members and attracted to the fixed core by excitation of the coil, an elastic urging means for urging the movable core in a direction away from the fixed core, and a valve seat support A valve rod having a valve body that can be seated on a valve seat provided on the member, and a valve rod connected to the movable core; and an outer peripheral portion of the valve rod sandwiched between the yoke body and the valve seat support member.
A normally closed solenoid valve having a bearing plate for movably guiding an air gap formed between the fixed core and the movable core when the valve body is seated on the valve seat to a predetermined size. An air gap adjusting method for determining the thickness of the bearing plate, the first reference surface of the yoke body and the valve body contacting one end surface of the bearing plate in a state where the movable core is pressed against the fixed core. A first step of measuring a first distance between the front end of the valve seat and a second distance between a second reference surface of the valve seat support member with which the other end surface of the bearing plate abuts and the front end of the valve seat. A second step of measuring, and a thickness of the bearing plate is determined based on the first and second distances and the air gap, and the thickness of the determined thickness is determined .
Set the bearing plate correctly between the yoke body and the valve seat support member.
In this way, the air gap is made to coincide with a target value.
And a third step described above.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, in the second step, a sphere having the same radius of curvature as the valve body is placed on the valve seat, and A third distance between a vertex and the second reference plane is measured, and the second distance is determined based on the third distance and a diameter of a sphere.

According to a third aspect of the present invention, there is provided a housing comprising a housing body, a coil, a fixed core, a yoke, and a valve seat support member, and movably to the opposite side of the valve seat support member across the fixed core. A movable core that is provided and is attracted to the fixed core by excitation of the coil, an elastic biasing unit that biases the movable core in a direction away from the fixed core, and can be seated on a valve seat provided on the valve seat support member A normally open solenoid valve comprising: a valve rod having a variable valve body and connected to the movable core; and a bearing plate disposed between the yoke body and the movable core to guide the valve rod. An air gap adjusting method for determining a thickness of the bearing plate so as to adjust an air gap formed at a portion facing the fixed core and the movable core to a predetermined size when the air bearing is away from the valve seat. And one end of the bearing plate First between the first reference surface and is set on the yoke body second reference surface for positioning the fixed core
A first step of measuring a distance between the movable core and a second step of measuring a second distance between an end surface of the fixed core facing the movable core and a second reference plane; A third step of measuring a third distance between an end face and an end face of the movable core abutting the bearing plate; and a thickness of the bearing plate based on the first, second, and third distances and the air gap. And a fourth step of determining the length.

According to a fourth aspect of the present invention, there is provided a housing including a housing body, a coil, a fixed core, a yoke, and a valve seat supporting member, and the movable body being movable to the opposite side of the valve seat supporting member across the fixed core. A movable core that is provided and is attracted to the fixed core by excitation of the coil, an elastic biasing unit that biases the movable core in a direction away from the fixed core, and can be seated on a valve seat provided on the valve seat support member A valve rod connected to the movable core having a flexible valve body, and a bearing plate for guiding the valve rod between the yoke body and the valve seat support member or between the fixed core and the valve seat support member. In the normally open solenoid valve, the bearing is provided so as to adjust a valve stroke formed between a tip of the valve body and a tip of the valve seat to a predetermined size when the valve body is separated from the valve seat. A valve stroke adjustment method that determines the thickness of the plate A first step of measuring a first distance between the first reference surface of the fixed core or yoke body with which one end surface of the bearing plate abuts and the tip of the valve body, and the other end surface of the bearing plate abuts Measuring a second distance between a second reference surface of the valve seat support member and the tip of the valve seat; and determining a thickness of the bearing plate based on the first and second distances and the valve stroke. And a third step of determining the degree.

According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, in the second step, a sphere having the same radius of curvature as the valve body is placed on the valve seat, and A third distance between a vertex and the second reference plane is measured, and the second distance is determined based on the third distance and a diameter of a sphere.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[0011] First, the present invention from the first embodiment applied to an air gap adjustment of the normally closed electromagnetic valve V _1. In FIG. 1, a housing 1 includes a housing main body 2 made of a stepped cylindrical magnetic body having a bottom, an annular yoke body 3 which is caulked to an open end of the housing main body 2, and an opening of the yoke body 3. It has become a valve seat support member 4 which is caulking to an end, the first port 5 ₁ dated orifice to the valve seat support member 4, and the second port 5 ₂ are respectively provided in the yoke body 3. A bobbin 7 around which a coil 6 is wound is accommodated in a large diameter portion of the housing body 2, and a fixed core 8 is fitted in a bottomed small diameter portion of the housing body 2. Both ends of a guide tube 9 made of a non-magnetic material fitted on the inner peripheral surface of the bobbin 7 are brazed to the fixed core 8 and the yoke body 3 after fitting the seals.

The yoke body 3 and the guide cylinder 9 define a series of cylindrical guide holes 10 by their inner peripheral surfaces.
A movable core 12 facing the fixed core 8 with a nonmagnetic spacer 11 interposed therebetween is slidably fitted in the guide hole 10. The movable core 12 has a valve rod 13 penetrating the center thereof.
And a valve seat 14 on which a hemispherical valve body 13a formed at one end of the valve rod 13 can be seated.
A coil-shaped return spring 15 is fitted between the fixed and movable cores 8 and 12 so as to urge the valve rod 13 in the seating direction on the valve seat 14.

[0013] the valve hole 14a of the valve seat 14 which is opened and closed by the valve body 13a is continuous with the first port 5 _1. In order to hold the valve rod 13 coaxially with the valve seat 14, the valve rod 13
A bearing plate 16 that slidably supports the outer periphery of the upper part of the valve seat is fitted into the large-diameter mounting hole 3 a of the yoke body 3, and is sandwiched between the annular projection 4 b provided on the valve seat support member 4 and the yoke body 3. A plurality of through holes 4c are provided in the annular projection 4b of the valve seat support member 4, the valve hole 14a and the second port 5 ₂ through the through hole 4c
And communicate with each other.

When the normally closed solenoid valve V ₁ is in the closed state shown in the figure, the movable distance of the movable core 12, that is, the valve stroke VS, is the air which is the distance between the opposed surfaces of the fixed core 8 and the movable core 12. It is a value obtained by subtracting the thickness SP of the spacer 11 from the gap AG.

VS = AG-SP (1) To give an example of each of the above dimensions, air gap AG = 0.
5 mm, valve stroke VS = 0.3 mm, and spacer thickness SP = 0.2 mm. The air gap AG
Can be adjusted by the thickness X of the bearing plate 16 sandwiched between the yoke body 3 and the valve seat support member 4. That is, when the thickness X of the bearing plate 16 is increased, the distance between the fixed core 8 and the valve seat 14 is increased, and the air gap AG is increased.
When the thickness X of the bearing plate 16 is reduced, the distance between the fixed core 8 and the valve seat 14 is reduced, and the air gap AG is reduced. Therefore, the thickness X of the bearing plate 16 is determined by the method described below, and the size of the air gap AG can be adjusted to a desired value by mounting the bearing plate 16 having the thickness X.

First, as shown in FIG. 2, before the valve seat supporting member 4 is caulked to the yoke body 3, the temporary bearing 17 having the valve rod 13 penetrated through the small-diameter mounting hole 3b of the yoke body 3 is inserted. By press-fitting, the movable core 12 is temporarily fixed so that the valve rod 13 does not tilt. At this time, the movable core 12 is pressed by the temporary bearing 17 and abuts on the spacer 11,
That is, the valve is fixed in an open state where the valve stroke VS becomes zero. In this state, the first end of the bearing plate 16 abuts against the first end.
The distance A between the reference plane P ₁ (the bottom wall of the large-diameter mounting hole 3a of the yoke body 3) and the tip of the valve body 13a of the valve rod 13 is measured by a measuring means such as a dial gauge.

Subsequently, as shown in FIG. 3, the valve hole 14a of the valve seat 14 press-fitted into the valve seat support member 4 before the caulking connection.
A hemispherical valve element 13a and topped with a sphere 18 having the same diameter d, (the tip of the valve seat support member 4 of the annular projection 4b) second reference plane P ₂ of the other end face of the bearing plate 16 abuts the valve stem 13 The distance B between the sphere 18 and the vertex is measured by a measuring means such as a dial gauge. At this time, since the diameter of the sphere 18 is d, the distance between the tip of the second reference plane P ₂ and the valve hole 14a C
Is represented by C = B + d (2). The distance between the first reference plane P ₁ and the second reference plane P ₂ is determined by the length of the bearing plate 1 after the valve seat supporting member 4 is caulked and connected.
Since equal to the thickness X of 6, the distance D between the tip of the first reference plane P ₁ and the valve hole 14a after caulking the valve seat support member 4 is represented by D = B + d + X ...... (3) You.

[0018] In Thus, the valve stroke VS from the distance D between the tip of the first reference plane P ₁ and the valve hole 14a, the valve element 13a of the first reference plane P ₁ and the valve stem 13 in the open state It is represented by a value obtained by subtracting the distance A from the tip.

VS = DA = -A + B + d + X (4) Therefore, from the equations (1) and (4), VS = AG-SP = -A + B + d + X (5) The thickness X of the plate 16 is given by: X = AG-SP + ABd (6)

That is, the bearing plate 16 having the thickness X given by the equation (6) is selected from a plurality of bearing plates 16 having different thicknesses X prepared in advance, and the provisional bearing 1 is selected from the yoke 3.
By assembling the yoke 3 and the valve seat supporting member 4 after removing the air gap 7, the air gap AG can be set to a desired value without using a temporary spacer which has been conventionally required. It should be noted that a plurality of types (about seven types) of the bearing plate 16 may be prepared at, for example, 0.05 mm intervals centering on the most frequently used thickness.

Next, referring to FIG.
_{A second} embodiment applied to the air gap adjustment and the valve stroke adjustment of No. 2 will be described.

The normally open solenoid valve V ₂ has a lower yoke 30 with a bottom fitted in a small diameter portion with a bottom of the housing body 2 of the housing 1, and the lower yoke 30 is fitted to one end of the guide cylinder 9. Above, it is brazed, and guide hole 1 is formed by these inner peripheral surfaces.
0 is defined. A fixed core 8 is fitted to the upper yoke body 3, and a movable core 12 facing the fixed core 8 is slidably fitted to the guide hole 10. A valve rod 13 penetrating the center of the movable core 12 is connected to the movable core 12. A return spring 15 is provided to separate the valve rod 13 from the valve seat 14, that is, to bias the movable core 12 in the valve opening direction. Are fixed and movable cores 8 and 12
It is contracted between. Therefore, when the coil 6 is in the demagnetized state, the movable core 12 is held at the valve-opening position where the valve element 13a is separated from the valve seat 14 by the elastic force of the return spring 15,
Further, in the excited state of the coil 6, the valve 13 a is held at the valve closing position in which the valve 13 a is seated on the valve seat 14 by the attraction force between the fixed cores 8.

The valve rod 1 is provided between the fixed core 8 and the valve seat support member 4.
A bearing plate 16 that slidably supports the upper part of 3 is sandwiched,
A bearing plate 31 that slidably supports the lower portion of the valve rod 13 is fitted to the bottom of the lower yoke body 30. Thickness Y of bearing plate 31 supporting the lower end of movable core 12 in the demagnetized state
The air gap AG, which is the distance between the fixed core 8 and the movable core 12, is adjusted by selecting the fixed core 8 and the thickness Z of the bearing plate 16 that determines the distance between the fixed core 8 and the yoke body 9. The valve stroke VS, which is the distance between the tip of the body 13a and the tip of the valve hole 14a, is adjusted. At this time, so that the valve body 13a can be properly seated on the valve seat 14,
The air gap AG is set to be larger than the valve stroke VS.

First, a method of adjusting the air gap AG will be described.

With the coil 6, the lower yoke 30, the guide tube 9 and the upper yoke 3 assembled to the housing body 2, a first reference plane P ₃ (the bottom of the lower yoke 30) is set on the lower yoke 30. The distance E between the wall and the second reference plane P ₄ (the step where the fixed core 8 and the upper yoke body 3 are engaged with each other) set on the upper yoke body 3 is measured. Further, the axial length F of the portion below the step portion of the fixed core 8 and the axial length G of the movable core 12 are measured. As for the distance E, if the thickness of the bearing plate 31 is Y and the air gap is AG, the following relationship holds: Y = EFGG-AG (7). This indicates that a desired air gap AG can be secured without using a temporary spacer by selecting and using the bearing plate 31 having a predetermined thickness Y obtained based on the equation (7). .

Next, a method of adjusting the valve stroke VS will be described.

Before the valve seat support member 4 and the bearing plate 16 are assembled to the normally open solenoid valve V ₂ , a first reference plane P ₅ (contact surface with the bearing plate 16) set on the fixed core 8. And valve rod 1
The distance H to the tip of the third valve body 13a is measured. In the case where the bearing plate 16 is supported on the yoke body 3, the first reference plane P ₅ is set on the yoke body 3.

Next, as shown in FIG.
The spherical body 18 having the same diameter d as the hemispherical valve body 13a of the valve rod 13 is placed on the valve hole 14a of the valve seat 14 press-fitted into the valve seat 14, and the second reference plane P ₆ (bearing plate) set on the valve seat support member 4 The distance I between the abutment surface 16 and the vertex of the sphere 18 is measured. Thus, the distance J between the tip of the second reference plane P ₆ and the valve hole 14a is given by d-I.

Assuming that the thickness of the bearing plate 16 is Z and the valve stroke is VS, the following relationship holds: Z = H + VS-J (8). This indicates that a desired valve stroke VS can be secured without using a temporary spacer by selecting and using the bearing plate 16 having a predetermined thickness Z obtained based on the equation (8). .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made.

[0031]

As described above, according to the first, third, and fourth aspects of the present invention, during assembly of the solenoid valve, each dimension from the reference plane is measured, and the measured dimension and the target are measured. The thickness of the bearing plate is determined on the basis of the air gap or the valve stroke, and the bearing plate having the determined thickness is placed at a predetermined position.
By properly setting the air gap or the valve stroke, the air gap or the valve stroke can be made to coincide with the target value. This eliminates the need for a temporary spacer, which has been conventionally required, and reduces the number of parts and the number of assembly steps. So
The bearing plate that slides and guides the valve rod
Or used as an adjustment plate for adjusting the valve stroke.
Simplifies the adjustment structure and reduces costs
And the handling becomes simple.

According to the second and fifth aspects of the present invention, a sphere having the same radius of curvature as the valve body is placed on the valve seat, and the distance is measured with reference to the apex of the sphere. In addition, the distance from the tip of the valve seat recessed in a concave shape can be easily and accurately measured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a normally closed solenoid valve according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a distance measurement between a first reference plane and a tip of a valve body.

FIG. 3 is an explanatory diagram of a distance measurement between a second reference plane and a tip of a valve seat.

FIG. 4 is a longitudinal sectional view of a normally-open solenoid valve according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a distance measurement between a second reference plane and a tip of a valve seat.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Housing 2 Housing main body 3 Yoke body 4 Valve seat support member 6 Coil 8 Fixed core 12 Movable core 13 Valve rod 13a Valve body 14 Valve seat 15 Return spring (elastic urging means) 16 Bearing plate 18 Sphere 30 Yoke body 31 Bearing plate AG air gap VS valve stroke P ₁ first reference plane P ₂ a second reference plane P ₃ the first reference plane P ₄ second reference plane P ₅ first reference plane P ₆ second reference plane

Claims (5)

(57) [Claims] 1. A housing body (2), a coil (6),
A housing (1) comprising a fixed core (8), a yoke body (3) and a valve seat support member (4); and a coil movably disposed between the fixed core (8) and the valve seat support member (4). A movable core (12) attracted to the fixed core (8) by the excitation of (6); and a resilient biasing means (15) for biasing the movable core (12) in a direction away from the fixed core (8). A valve rod (13) having a valve body (13a) that can be seated on a valve seat (14) provided on a valve seat support member (4) and connected to a movable core (12); and a yoke body (3). ) And a bearing plate (16) sandwiched between the valve seat support members (4) to slidably guide the outer peripheral portion of the valve rod (13). ) Is seated on the valve seat (14), the air gap (A) formed in the opposed portion of the fixed core (8) and the movable core (12). ) To adjust the thickness (X) of the bearing plate (16) to a predetermined size, wherein the movable core (12) is pressed against the fixed core (8). First of the yoke body (3) with which one end face of the bearing plate (16) is in contact.
A first step of measuring a first distance (A) between the reference plane (P ₁ ) and the tip of the valve element (13a), and a valve seat support member ( 4)
A second step of measuring a second distance (C) between the second reference plane (P ₂ ) and the tip of the valve seat (14), and the first and second distances (A, C). And the thickness (X) of the bearing plate (16) is determined based on the air gap (AG).
Then, the bearing plate (16) having the determined thickness (X) is yawed.
Correctly set between the lock body (3) and the valve seat support member (4).
In this way, the air gap (AG) matches the target value.
And an air gap adjusting method for the normally closed solenoid valve. 2. In the second step, a valve seat (14) is provided.
The spherical body (1) having the same radius of curvature as the valve body (13a)
8) is placed, a third distance (B) between the vertex of the sphere (18) and the second reference plane (P ₂ ) is measured, and the third distance (B) and the sphere (18) are measured. The second distance (C) is determined based on the diameter (d) of the first distance.
An air gap adjusting method for the normally closed solenoid valve according to the above. 3. A housing body (2), a coil (6),
A housing (1) comprising a fixed core (8), a yoke body (3, 30) and a valve seat support member (4); and a fixed core (8)
A movable core (12) movably disposed on the opposite side of the valve seat support member (4) with the movable core (12) attracted to the fixed core (8) by excitation of the coil (6); A resilient urging means (1) for urging in a direction away from the fixed core (8).
5) a valve rod (13) having a valve body (13a) that can be seated on a valve seat (14) provided on a valve seat support member (4) and connected to a movable core (12); In a normally open solenoid valve including a bearing plate (31) disposed between a body (30) and a movable core (12) to guide a valve rod (13), a valve body (13a) includes a valve seat (13). The thickness of the bearing plate (31) is adjusted so as to adjust the air gap (AG) formed at the opposed portion of the fixed core (8) and the movable core (12) to a predetermined size when the bearing plate (31) is separated from the fixed core (8). An air gap adjusting method for determining the length (Y), wherein a first reference surface (P ₃ ) which is set on a yoke body (30) and one end surface of a bearing plate (31) is in contact with the yoke body (3) A first step for measuring a first distance (E) between the second reference plane (P ₄ ) and the second reference plane (P ₄ ) for positioning the fixed core (8); A second step of measuring a second distance (F) between the end surface of the fixed core (8) facing the movable core (12) and the second reference plane (P ₄ ); 8) a third step of measuring a third distance (G) between an end face of the movable core (12) opposed to 8) and an end face of the movable core (12) abutting on the bearing plate (31); 1, second and third distances (E, F,
G) and a fourth step of determining the thickness (Y) of the bearing plate (31) based on the air gap (AG). . 4. A housing body (2), a coil (6),
A housing (1) including a fixed core (8), a yoke body (3), and a valve seat support member (4), and a housing movably disposed on the opposite side of the valve seat support member (4) across the fixed core (8). A movable core (12) which is provided and is attracted to the fixed core (8) by excitation of the coil (6); and an elastic biasing means for biasing the movable core (12) in a direction away from the fixed core (8). (1
5) a valve rod (13) having a valve body (13a) that can be seated on a valve seat (14) provided on a valve seat support member (4) and connected to a movable core (12); A bearing plate (16) is provided between the body (3) and the valve seat support member (4) or between the fixed core (8) and the valve seat support member (4) to guide the valve rod (13). In the normally-open type solenoid valve, a valve stroke formed between the tip of the valve body (13a) and the tip of the valve seat (14) when the valve body (13a) is separated from the valve seat (14). A valve stroke adjusting method for determining the thickness (Z) of the bearing plate (16) in order to adjust VS) to a predetermined size, wherein the fixed core (8) contacts one end surface of the bearing plate (16). ) or yoke body (first reference surface 3) (P ₅₎ a valve body (13a)
A first step of measuring a first distance (H) between the front end of the valve seat and a second reference surface (P ₆ ) of the valve seat support member (4) with which the other end surface of the bearing plate (16) abuts. A second step of measuring a second distance (J) between the end of the valve seat (14) and the valve stroke (VS) based on the first and second distances (H, J) and the valve stroke (VS). A third step of determining the thickness (Z) of the bearing plate (16). 5. In the second step, the valve seat (14)
The spherical body (1) having the same radius of curvature as the valve body (13a)
8) is placed, a third distance (I) between the vertex of the sphere (18) and the second reference plane (P ₆ ) is measured, and the third distance (I) and the sphere (18) are measured. The second distance (J) is determined based on a diameter (d) of the second distance.
A valve stroke adjusting method for the normally-open solenoid valve described in the above.