JP3668605B2 - Pilot kick solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pilot kick type solenoid valve that includes a pilot valve and opens and closes the main valve in two stages, and in particular, stabilization of an unstable main valve body holding member that is suspended in a movable iron core when the valve is opened. The present invention relates to a pilot kick type solenoid valve that achieves the above.
[0002]
[Prior art]
Conventionally, a pilot kick type electromagnetic valve is used in which a pilot valve body is driven by the magnetic force of a solenoid and the main valve is opened and closed by adjusting the pressure in the valve chamber. FIG. 4 is a cross-sectional view of an example of a conventional pilot kick solenoid valve when the valve is closed.
The pilot kick solenoid valve 51 is integrally provided with a main body 55 having a valve seat 54 formed in a valve hole communicating with an input port 52 and an output port 53, and a solenoid 56 on the upper portion thereof.
A fixed iron core 57 is fixed at the center, and a movable iron core 59 that is pin-coupled to a main valve body holder 58 that is a main valve body holding member is movably inserted under the fixed core 57. The main valve body holder 58 has a pilot hole 60 formed through the shaft core portion, and a ring-shaped main valve body 61 is fitted to the lower end thereof. On the other hand, the movable iron core 59 is fitted with a pilot valve body 62 that opens and closes the pilot hole 60 at the lower end. In addition, a spring 63 is provided between the movable iron core 59 and the fixed iron core 60, and is always urged downward.
[0003]
When the solenoid 56 is not energized, the pilot kick solenoid valve 51 having such a configuration is configured such that the main valve body 61 is pressed against the valve seat 54 via the movable iron core 59 biased downward by the spring 63. The valve closed state is maintained.
On the other hand, when the solenoid 56 is energized, the movable iron core 59 is attracted to the upper fixed iron core 57 by the magnetic force and rises against the urging force of the spring 63. At this time, since the pilot hole 60 is opened due to the rise of the movable iron core 59, the fluid on the primary side of the main valve 61 flows out to the output port 53 side. Therefore, when the primary pressure is lowered, the main valve body holder 58 is pulled up to the movable iron core 59 through the pin, the main valve is opened, and the movable iron core 59 is attracted to the fixed iron core 57 as shown in the figure.
[0004]
[Problems to be solved by the invention]
However, in the conventional pilot kick type solenoid valve having such a configuration, when the valve is opened, the main valve body holder 58 is in an unstable state that is simply suspended from the movable iron core 59 by the pin 64. There has been a problem of wear due to the shake of the body holder 58.
That is, for example, a pilot kick type solenoid valve is attached to a natural gas vehicle and used for gas supply to an engine unit. Then, since this pilot kick type solenoid valve is used during driving of the automobile, it is always subjected to vibration during operation. For this reason, the main valve body holder 58 that is only suspended from the movable iron core 59 causes wear due to collision or rubbing against other members, such as vibration or bouncing due to vibration. The shaking of the body holder 58 is transmitted to the movable iron core, and wear is generated between the fixed iron core.
[0005]
Therefore, an object of the present invention is to provide a pilot kick type electromagnetic valve in which a main valve body holding member is stabilized even when the valve is opened, in order to eliminate such problems.
[0006]
[Means for Solving the Problems]
A pilot kick type solenoid valve of the present invention includes a main body in which a main valve seat is formed in a valve hole communicating between an outflow port and an inflow port, and a fixed iron core fixed to a wound coil shaft portion. A solenoid having a movable iron core that is movable in the axial direction; a main valve body holding member that holds a main valve body that abuts the main valve seat and forms a valve seat in a pilot hole; An iron core and a main valve body holding member are pin-coupled with an axial clearance that allows the pilot valve body held at the lower end of the movable core to be in contact with the valve seat of the pilot hole. When the valve is opened, the main valve body holding member that is lifted by being pulled by the movable core comes into contact with the non-movable part before the movable core is attracted to the fixed core, and the movable core and the main valve body The rising of the holding member is limited.
[0007]
Therefore, the movable iron core is pulled up by the fixed iron core due to the magnetic force generated by energizing the coil, but at that time, only the movable iron core rises by the axial gap provided by the pin connection, and is held by the movable iron core. When the pilot valve body is separated from the valve seat, the pilot hole is opened and the fluid flows to the outflow port side. For this reason, the fluid pressure on the inflow port side that has been acting to bring the main valve body into contact with the valve seat decreases, and then the main valve body holding member is pulled up to the movable iron core at a predetermined timing, and the main valve body is Separated from the seat, the fluid flows from the inlet port to the outlet port side through the valve hole.
The main valve body holding member pulled up by the movable iron core comes into contact with the non-movable part before the movable iron core is adsorbed to the fixed iron core, and the rise of the movable iron core and the main valve body holding member is restricted. The force that the iron core is pulled toward the fixed iron core and the reaction force that the main valve body holding member abuts against the non-movable member balances to maintain the main valve body holding member in a stable state when the valve is opened. Become.
[0008]
Further, in the pilot kick type electromagnetic valve according to the present invention, the main valve body holding member is formed with a stepped portion that protrudes in a radial direction larger than the diameter of the cylindrical pipe inserted so that the movable iron core moves up and down stably. The step portion abuts against a non-movable member disposed at the lower end portion of the cylindrical pipe.
Therefore, when the valve is opened, the step of the main valve body holding member abuts against the non-movable member, the force that the movable core is pulled toward the fixed core, and the reaction force that the main valve body holding member abuts against the non-movable member The main valve body holding member is maintained in a stable state when the valve is opened.
[0009]
Further, in the pilot kick type electromagnetic valve according to the present invention, the main valve body holding member has a taper formed on the contact surface of the step portion thereof, and contacts the tapered surface formed at the same angle as the non-movable member. It is characterized by being.
Therefore, when the valve is opened, the stepped portion of the main valve body holding member abuts against the non-movable member with the tapered surfaces, and the force that pulls the movable core toward the fixed core side and the main valve body holding member abuts against the non-movable member Therefore, when the valve is opened, the main valve body holding member is restricted from moving in the lateral direction and is maintained in a stable state.
[0010]
In the pilot kick type electromagnetic valve according to the present invention, the main valve body holding member is formed by providing an elastic material at a contact portion.
Therefore, when the valve is opened, the stepped portion of the main valve body holding member abuts against the non-movable member via the elastic member, and the force that pulls the movable core toward the fixed core side and the main valve body holding member is the non-movable member. This counteracts the reaction force received in contact with the valve, and prevents the wear on the contact surface when the valve is opened, thereby maintaining the main valve body holding member in a stable state.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment embodying a pilot kick type solenoid valve of the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views showing a pilot kick type electromagnetic valve according to the first embodiment, in which FIG. 1 shows a valve closing time and FIG. 2 shows a valve opening time.
The pilot kick solenoid valve of the present embodiment has many configurations in common with the above-described conventional pilot kick solenoid valve, but will be described in more detail here.
[0012]
The pilot kick type solenoid valve includes an upper half solenoid part 1 and a lower half valve part 2. The solenoid unit 1 includes a coil 3 in which a copper wire is wound in a hollow cylindrical shape, and a magnetic frame 4 is provided so as to surround the coil 3. A fixed iron core 5 inserted to approximately the vicinity of the center of the coil 3 is fixed to the upper end of the hollow portion of the solenoid portion 1. In addition, in the hollow portion of the solenoid portion 1, a pipe 7 whose upper end is fixed to the fixed core 5 and whose lower end is welded to the connecting member 6 is fitted, and a movable iron core 8 that is movable up and down is inserted into the pipe 7. Has been. The movable iron core 8 is always urged downward by a spring 9 provided between the movable iron core 5 and the movable iron core 5.
[0013]
On the other hand, the valve part 2 is comprised in the main body 13 in which the inflow port 11 and the outflow port 12 were formed. The main body 13 is opened upward, and a connecting member 6 fixed to the magnetic frame 4 is screwed into the main body 13 so that the solenoid portion 1 and the valve portion 2 are integrally formed. In addition, a main valve seat 15 is formed in the main body 13 so as to protrude above the valve hole 14 that communicates the inflow port 11 and the outflow port 12, and a main valve chamber is formed on the primary side of the main valve seat 15. 16 is formed.
A main valve body holder 18, which is a main valve body holding member connected to the lower end of the movable iron core 8 via a pin 17, is disposed in the main valve chamber 16. The main valve element holder 18 is loosely fitted into the lower end of the movable iron core 8, and the pin 17 is inserted with a margin in the moving direction of the movable iron core 8 into a large insertion hole 19 that penetrates the overlapped portion in the radial direction. Yes. Therefore, the main valve element holder 18 can move with respect to the movable iron core 8 by an axial gap between the insertion hole 19 and the pin 17.
[0014]
A pilot valve chamber 21 is formed in the insertion portion of the main valve body holder 18 into which the lower end portion of the movable core 8 is inserted. The main valve body holder 18 has a small hole 22 formed in a lateral direction for communicating the pilot valve chamber 21 and the main valve chamber 16, and a pilot hole 23 formed in an axial center portion. A valve seat 24 protruding from the chamber 21 is formed.
On the other hand, at the lower end of the movable iron core 8 inserted into the pilot valve chamber 21 of the main valve holder 18, a pilot valve body 25 that contacts and separates from a valve seat 24 formed on the main valve holder 18 is held. . At the lower end of the main valve holder 18, a main valve body 20 that is in contact with and separated from the valve seat 15 formed in the main body 13 is held.
[0015]
By the way, the pilot kick type solenoid valve of the present embodiment is formed with a stepped portion 26 in which the axial dimension of the main valve element holder 18 is shortened and the lower portion is expanded in the radial direction. When the valve 26 shown in FIG. 2 is opened, the step portion 26 comes into contact with the lower end surface of the connecting member 6 corresponding to the non-movable portion described in the claims. At this time, the movable iron core 8 and the main valve body holder 18 are The dimension in the axial direction is determined so that the movable iron core 8 does not hit the fixed iron core 5 and a slight gap is formed.
As will be described later, when the movable iron core 8 is attracted to the fixed iron core 5 and rises, the upward force applied to the movable iron core 8 by the magnetic attraction force and the step portion 26 come into contact with each other and the reaction from the connecting member 6 occurs. In this configuration, the downward force applied to the main valve element holder 18 is balanced by the force.
[0016]
Next, the operation of the pilot kick solenoid valve of the present embodiment having the above configuration will be described.
First, when the coil 3 is not energized, the movable iron core 8 is pushed downward by the urging force of the spring 9 as shown in FIG. 1, the pilot valve body 25 abuts the valve seat 24 and closes the pilot hole 23, Further, the main valve body holder 18 is pushed downward, and the main valve body 20 comes into contact with the main valve seat 15.
[0017]
Accordingly, the inflow port 11 and the outflow port 12 do not communicate with each other, and the fluid flowing into the main body 13 from the inflow port 11 flows into the valve chamber 16 and further flows into the pilot valve chamber 21 from the small hole 22.
At this time, the pressure in the valve chamber 16 and the pilot valve chamber 21 is increased by the fluid flowing in from the inflow port 11. Therefore, in the state where the main valve body 20 is in contact with the main valve seat 15 and the pilot valve body 25 is in contact with the valve seat 24 as shown in FIG. 1, the pressure on the primary side is higher than the pressure on the secondary side, The valve closed state is maintained by the pressure difference.
[0018]
On the other hand, when a magnetic field is generated by the magnetic circuit passing through the magnetic frame 4, the fixed iron core 5, and the movable iron core 8 by energizing the coil 3, the movable iron core 8 is attracted to the fixed iron core 5 by the magnetic force and rises.
Therefore, first, the movable iron core 8 rises against the urging force of the spring 9, but at the initial time, only the movable iron core 8 rises by the axial gap of the through hole 19 in which the pin 17 is inserted. Therefore, the pilot valve body 25 is separated from the valve seat 24 and the pilot hole 23 communicates, and the fluid in the pilot valve chamber 21 flows toward the outflow port 12.
Therefore, the pressure difference between the inflow port 11 side and the outflow port 12 side is reduced, the fluid pressure in the valve closing direction (downward in the drawing) applied to the main valve body holder 18 is reduced, and the predetermined value at which the movable iron core 8 starts to rise. After this timing, the main valve body holder 18 is pulled up via the pin 17.
[0019]
Therefore, the main valve body 20 is separated from the valve seat 15 and the valve hole 14 communicates, and a large amount of fluid flows from the inflow port 11 side to the outflow port 12 side.
By the way, in the pilot kick type solenoid valve of the present embodiment, the stepped portion 26 of the lifted main valve element holder 18 hits the lower end surface of the connecting member 6, and the ascent of the movable iron core 8 is stopped. At this time, a gap is formed in the movable iron core 8 without adsorbing to the fixed iron core 5 as in the conventional example (see FIG. 4).
Therefore, the upward force applied to the movable iron core 8 by the magnetic attractive force and the downward force applied to the main valve body holder 18 by the reaction force from the connecting member 6 due to the contact of the stepped portion 26 are balanced. The holder 18 is stabilized in a state where it hits the connecting member 6.
[0020]
As a result, as described in the conventional problem, the main valve element holder 18 is fixed even in the case of receiving vibration during the valve opening operation, such as use in an automobile, so that the main valve element holder 18 is in a stable state and thus does not swing. . Therefore, the main valve body holder 18 and the movable iron core 8 do not come into contact with other members due to vibration, wear due to collision and rubbing is avoided, wear powder is not generated, and the life is also increased.
Further, since the valve seat 24 of the main valve body holder 18 does not inadvertently hit the pilot valve body 19 due to vibration, the seal surface of the pilot valve body 19 is not damaged and the life of the seal surface is also increased.
[0021]
Next, a second embodiment according to the pilot kick type solenoid valve of the present invention will be described. The pilot kick type solenoid valve of the present embodiment is of a pilot kick type having the same configuration as that of the first embodiment. Is omitted. FIG. 3 is a cross-sectional view showing a pilot valve portion in the pilot kick solenoid valve of the present embodiment.
Also in the pilot kick type electromagnetic valve of the present embodiment, the main valve element holder 33 is connected to the lower end of the movable iron core 31 via the pin 32. The main valve body holder 33 is loosely fitted to the lower end of the movable core 31 and the pin 32 is inserted in a large insertion hole 34 that penetrates the overlapped portion in the radial direction with a margin in the moving direction of the movable core 31. ing. Therefore, the main valve element holder 33 can move with respect to the movable iron core 31 by an axial gap between the insertion hole 34 and the pin 32.
[0022]
A pilot valve chamber 35 is formed in the main valve element holder 33 in which the lower end portion of the movable iron core 31 is inserted. The main valve body holder 33 is provided with a small hole 36 communicating with the pilot valve chamber 35 and the main valve chamber 16 (see FIG. 1), and further, a pilot hole 37 is formed in the shaft center portion. A valve seat 38 protruding from the pilot valve chamber 35 is formed.
On the other hand, a pilot valve element 39 that contacts and separates from a valve seat 38 formed in the main valve holder 33 is held at the lower end of the movable iron core 31 inserted into the pilot valve chamber 35 of the main valve holder 33. . At the lower end of the main valve holder 33, a main valve body 40 that is in contact with and separated from the valve seat 15 (see FIG. 1) formed in the main body 13 is held.
[0023]
By the way, also in the pilot kick type solenoid valve of the present embodiment, the main valve body holder 33 is formed with a stepped portion 41 having a reduced axial dimension and an expanded lower portion. However, the stepped portion 41 is formed with a tapered surface having the same angle as the contact surface of the connecting member 42 to be contacted.
And this step part 41 contact | abuts to the connection member 42 lower end surface at the time of valve opening shown in figure, and the movable iron core 31 and the main valve body holder 33 do not touch the fixed iron core 5, but the movable iron core 31 and the main valve body holder 33 have a slight gap. The axial dimension is determined so that the relationship can be established.
[0024]
Therefore, like the pilot kick type electromagnetic valve of the first embodiment, the movable iron core 31 is raised by the magnetic force generated by energizing the coil, and the main valve body holder 33 is pulled up at a predetermined timing. The raised main valve body holder 33 is stopped when the step 41 hits the taper surface of the connecting member 42, and accordingly the rising of the movable iron core 31 is stopped before it hits the fixed hand 5 (see FIG. 2).
When such a pilot kick type electromagnetic valve is fully opened, the upward force applied to the movable iron core 31 by the attractive force due to the magnetic force and the reaction force from the connecting member 42 are applied to the main valve element holder 33 by the step 41 abutting. The downward force is balanced.
[0025]
Therefore, the pilot kick type solenoid valve of the present embodiment is stable in a state where the main valve body holder 33 hits the connecting member 42 when the valve is opened. The holder 33 is fixed and does not sway, wear due to collision or rubbing is avoided, wear powder is not generated, and the life is also extended. In particular, since the contact surface between the main valve body holder 33 and the connecting member 42 is formed with a taper, the lateral displacement is also suppressed, so that the stability is further increased and the problem solving effect of occurrence of wear is achieved. More enhanced.
Further, since the valve seat 24 of the main valve body holder 18 does not inadvertently hit the pilot valve body 19 due to vibration, the seal surface of the pilot valve body 19 is not damaged and the life of the seal surface is also increased.
[0026]
As mentioned above, although the embodiment of the pilot kick type solenoid valve concerning the present invention was explained, the present invention is not limited to these, and various changes are possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the main valve body holders 18 and 33 are brought into direct contact with the connecting members 6 and 42, but an elastic material is applied to the step portions 26 and 41 of the main valve body holders 18 and 33. It is also possible to suppress wear powder generated by rubbing the contact surface due to vibration.
[0027]
【The invention's effect】
The present invention has a main body in which a main valve seat is formed in a valve hole communicating between an outflow port and an inflow port, a fixed iron core fixed to a wound coil shaft portion, and an axially movable member. A solenoid having a movable iron core, a main valve body holding member that holds a main valve body that contacts the main valve seat, and that forms a valve seat in a pilot hole, the movable iron core and the main valve body holding member; However, the pilot valve body held at the lower end of the movable core is pin-coupled with an axial clearance that can be contacted and separated from the pilot hole valve seat, and is pulled by the movable core when the valve is opened. The rising main valve body holding member is configured to abut against the non-movable part before the movable core is attracted to the fixed iron core so as to limit the rising of the movable core and the main valve body holding member. Pilot kick type electric power that will maintain the valve body holding member in a stable state It has become possible to provide a valve.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pilot kick solenoid valve according to a first embodiment when the valve is closed.
FIG. 2 is a cross-sectional view of the pilot kick solenoid valve according to the first embodiment when the valve is opened.
FIG. 3 is a cross-sectional view showing a pilot valve portion in a pilot kick type solenoid valve according to a second embodiment.
FIG. 4 is a sectional view showing a conventional pilot kick type solenoid valve when the valve is opened.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solenoid part 2 Valve part 3 Coil 5 Fixed iron core 6 Connecting member 8 Movable iron core 15 Main valve seat 16 Valve chamber 17 Pin 18 Main valve body holder 20 Main valve body 21 Pilot valve chamber 24 Valve seat 26 Step part

Claims (3)

A main body formed with a main valve seat in a valve hole communicating between the outflow port and the inflow port;
A solenoid having a fixed iron core fixed to a wound coil shaft core and a movable iron core movable in the axial direction;
A main valve body holding member that holds the main valve body in contact with the main valve seat and forms a valve seat in a pilot hole;
The pilot in which the movable iron core and the main valve body holding member are pin-coupled by providing an axial clearance in which the pilot valve body held at the lower end of the movable core can be in contact with the valve seat of the pilot hole. In kick type solenoid valve,
The main valve body holding member that is pulled up by the movable iron core when the valve is opened contacts the non-movable portion before the movable iron core is attracted to the fixed iron core, and the movable iron core and the main valve body holding member It has been made to limit the rise of,
The main valve body holding member is formed with a step portion protruding in a radial direction larger than the diameter of the cylindrical pipe inserted so that the movable iron core moves stably up and down, and the step portion is formed at the lower end portion of the cylindrical pipe. Abutting against the arranged non-movable member,
Part of the main valve body holding member is inserted into the inside of the cylindrical pipe . The pilot kick solenoid valve according to claim 1 ,
The main valve body holding member has a taper formed on the contact surface of the step portion thereof, and contacts the tapered surface formed at the same angle on the non-movable member. . In the pilot kick solenoid valve according to claim 1 or 2 ,
The pilot kick solenoid valve according to claim 1, wherein the main valve body holding member is formed by providing an elastic material at a contact location.

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