KR100264015B1 - Electro magnetic valve apparatus - Google Patents

Abstract

The present invention provides a solenoid valve device that is not affected by the temperature when using the generation of chattering and can be reliably suppressed, and that the rod responds quickly and accurately to variations in the magnitude of the current of the electromagnetic coil. The movable core 20 is provided with a fastening portion 22a at an end thereof, and at the same time, a circulation hole 22 enabling the holding and actuation of the buffer oil 30 in accordance with the movement of the movable iron core 20 formed along the axial direction. This distribution hole 22 is adapted to adjust the buffering force by the buffer oil 30 against the fluctuation of the movable iron core 20.

Description

Solenoid valve device

The present invention relates to a solenoid valve device used for controlling the oil pressure in the flow path by adjusting the clearance between the opening of the valve seat and the valve part, for example, by controlling the current flowing through the electromagnetic coil.

Fig. 6 is a sectional view showing the structure of a conventional solenoid valve device.

In Fig. 6, the solenoid valve device includes an electromagnetic coil 2 formed by winding an insulation-coated copper wire around a bobbin 1 serving as an insulating member, and a magnetic field generated by an electromagnetic coil provided inside the electromagnetic coil 2. The movable iron core 3, which is a magnetic body displaced by the displacement, and the rod 4, which is a non-magnetic material having the conical valve portion 4a at the tip of the movable iron core 3 being inserted, and one end in the bobbin 1, A fixed iron core (5) fixed to the movable core (3) opposite to the part, a yoke (6) made of a magnetic body fixed to the other end of the bobbin (1), and installed between the yoke (6) and the rod (4) The first bearing 6a, the second bearing 5a provided between the fixed iron core 5 and the rod 4, and the joint 7 of the nonmagnetic material provided between the fixed iron core 5 and the yoke 6 Equipped.

In addition, a buffer oil 30 is contained in the buffer chamber A surrounded by the fixed iron core 5, the joint 7, and the yoke 6, and the movable iron core 3 is a buffer oil for the moving part. The fluid resistance of 30 is received.

Moreover, the solenoid valve apparatus is provided in the valve seat 8 which has the opening part 8c which the valve part 4a of the rod 4 abuts, the input port 8a, and the discharge port 8b, and the rod 4 in one side. The coil spring 9 which applies the rod 4 to the input port 8a side, and the end part of this coil spring 9 are contacted and moved to the axial direction of the rod 4, and adjusts the pressing force of the coil spring 9 And a plate 11 fixed to the end face of the bobbin 1 and the fixed iron core 5, and an exterior case 12 covering each of the members. The magnetic circuit is formed by the plate 11, the fixed iron core 5, the movable iron core 3, and the yoke 6.

Next, operation | movement of the solenoid valve apparatus of the said structure is demonstrated based on FIG. 6 and FIG.

When the electromagnetic coil 2 is not energized, the elastic force of the coil spring 9 that pushes the rod 4 to the opening 8c side is greater than the hydraulic pressure of the control oil 31 in the input port 8a and the valve portion ( 4a) is press-contacted to the opening 8c. Therefore, the control oil 31 in the pipe into which the orifice 32 is inserted does not flow, and the hydraulic pressure of the control oil 31 at that time is output pressure from the output part 33. Becomes

In this state, when electricity is supplied to the electromagnetic coil 2, a magnetic field is generated in the electromagnetic coil 2, and the movable iron core 3 causes the stress of the coil spring 9 and the fluid of the buffer oil 30 to be caused by the magnetic field. The resistance is attracted to the fixed iron core 5 side, and the clearance between the valve portion 4a of the rod 4 and the opening 8c of the valve seat 8 becomes large. As a result, from the input port 8a The flow rate of the control oil 31 which flows through the opening 8c to the discharge port 8b increases, and the pressure to the output part 33 falls, and the reduced pressure is output from the output part 33. The output pressure of the output part 33 in the case corresponds to the magnitude of the current of the electromagnetic coil 2.

In the conventional solenoid valve device as described above, the movable core 3 generated by the stress of the coil spring 9, the supply pressure of the control oil 31 supplied to the input port 8a, and the magnetic field of the electromagnetic coil 2 Although the output pressure from the output unit 33 is controlled by harmonizing the suction force, chattering occurs in which the rod 4 continuously fluctuates due to fluctuations in the supply pressure of the control oil 31 and the like. There is a problem that the output pressure from (33) cannot be controlled normally.

In addition, in order to prevent the occurrence of chattering, for example, the entire inner diameter of the yoke 6, the fixed core 5, and the joint 7 is made small so that the gap 34 between these inner circumferential surfaces and the inner circumferential surface of the movable iron core 3 is reduced. A method of making the movement of the movable core 3 in the buffer chamber A more smooth by increasing the fluid resistance of the buffer oil 30 to the movement of the movable core 3 by reducing the number of?

However, the viscosity of the buffer oil 30 in the buffer chamber A varies greatly depending on the temperature, and when the temperature of the buffer oil 30 decreases, the viscosity of the buffer oil 30 is high and this measure is employed. The resistance of the buffer oil 30 flowing through the gap 34 formed throughout the movable core 3 is too large so that the load 4 can be quickly and accurately responded to variations in the magnitude of the current of the electromagnetic coil 2. There is a problem that the output pressure at the output unit 33 cannot be suppressed to normal without responding.

On the other hand, in the case where the gap 34 is enlarged, the rod 4 responds quickly and accurately when the temperature of the buffer oil 30 decreases, but at a high temperature when the viscosity of the buffer oil 30 becomes small, the movable core 3 There is a problem that the fluid resistance of the buffer oil 30 against the oil is too small to cause chattering.

When the entire solenoid valve device is completely immersed in oil, air does not enter the buffer chamber A, but under the situation that the solenoid valve device is temporarily exposed from the oil surface and used, Since air having a small fluid resistance penetrates, there is a problem that chattering is likely to occur even in this case.

The present invention aims to solve such a problem, and it is possible to reliably suppress the influence of the temperature when using the generation of chattering without being affected, and also to quickly and accurately load the fluctuation of the magnitude of the current of the electromagnetic coil. It is an object to obtain a solenoid valve device in which.

In the solenoid valve device of the present invention, the movable iron core has a circulation hole through which a buffer oil moves in accordance with the movement of the movable iron core formed along the axial direction while being provided with a fastening portion at the end thereof. The buffer force by the said buffer oil is adjusted to the fluctuation | variation of an iron core.

In addition, in the solenoid valve device of the present invention, the movable iron core is provided with a fastening portion at the end, and has a flow hole through which the buffer oil moves in accordance with the movement of the movable iron core formed along the axial direction, and the joint has a fixed iron core and a yoke. It has a projection which protrudes inward with an inner diameter smaller than the inner diameter of the, and the buffer force is adjusted by the buffer oil against the fluctuation of a movable iron core by this protrusion and a distribution hole.

In the solenoid valve device of the present invention, the buffer chamber and the discharge port communicate with each other through a communication hole formed in the yoke.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing the construction of a first embodiment of a solenoid valve device of the present invention.

Figure 2 is an enlarged view of the main portion of the solenoid valve device of FIG.

Fig. 3 is a sectional view showing the construction of a second embodiment of the solenoid valve device of the present invention.

Fig. 4 is a sectional view showing the arrangement of the third embodiment of the solenoid valve device of the present invention.

Fig. 5 is a sectional view showing the construction of the fourth embodiment of the solenoid valve device of the present invention.

Fig. 6 is a sectional view showing the structure of a solenoid valve device of the prior art.

7 is an explanatory diagram of a pressure control mechanism by a solenoid valve device;

(Explanation of symbols for the main parts of the drawing)

DESCRIPTION OF SYMBOLS 1: Bobbin 2: Electromagnetic coil 4: Rod 4a: Valve part 5: Fixed core 6: Yoke 8: Valve seat 8a Input port 8b Discharge port 8c: Opening part 9: Coil spring 20: Moving core 21: Joint 21a: Projection part 22: Distribution hole 22a: Fastening part 23: Clearance 24, 25, 26: Communication hole 27: Rod 27a: Oil passage 27b ₁ : First branch euro 27b ₂ : Second branch euro 30: Buffer oil 31: Control oil A: Wan Enhancement A ₁ : Fixed core core buffer room A ₂ : York side buffer room

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the solenoid valve apparatus of 1st Example of this invention is demonstrated. In addition, about the following description, the same code | symbol is attached | subjected to the component same as FIG.

1 is a cross-sectional view of the solenoid valve device of the first embodiment, and FIG. 2 is an enlarged view of a main portion of FIG.

In Fig. 1, the solenoid valve device is formed of an electromagnetic coil 2 formed by winding an insulating coated copper wire on a bobbin 1 made of an insulating member, and a magnetic field generated by the electromagnetic coil 2 provided inside the electromagnetic coil. A movable iron core 20 made of a magnetic material to be displaced, a rod 4 made of a non-magnetic material having the conical valve portion 4a inserted at the same time as the movable iron core 20 is inserted, and a bobbin 1 The yoke 6 made of a magnetic iron fixed to the other end of the bobbin 1, a fixed iron core 5 fixed to the inner end of the bobbin 1, and the yoke 6 and the rod 4 Of the non-magnetic material provided between the first bearing 6a provided between the second bearing 5a provided between the fixed iron core 5 and the rod 4, and the fixed iron core 5 and the yoke 6. The joint 21 is provided.

A flow hole 22 is formed in the movable core 20 along the axial direction, and a fastening portion 22a having a thickness dimension ¹ ₂ is formed at the end of the flow hole 22 on the fixed iron core 5 side. In the form of this embodiment, although only one circulation hole 22 is formed in the movable iron core 20, it may be provided in multiple numbers at regular intervals in the circumferential direction.

In the buffer chamber A surrounded by the fixed iron core 5, the joint 21, and the yoke 6, the protrusion 21a protrudes inward from the inner wall surfaces of the fixed iron core 5 and the yoke 6. by is composed of the fixed core side, complete enhancement (a ₁₎ and the yoke side complete fidelity (a _2). in the gap path dimension _¹¹ between the outer circumferential face of the inner peripheral surface and the movable iron core 20 of the projections (21a) (23 ) Is installed.

In addition, the solenoid valve device includes a valve seat 8 having an opening 8c, an input port 8a, and a discharge port 8b, to which the valve portion 4a of the rod 4 abuts, and a rod 4; A coil spring 9 for urging the rod 4 provided on one side of the coil to the input port 8a side, abutting the end of the coil spring 9, and moving in the axial direction of the rod 4; An adjustment screw 10 for adjusting the pressing force of 9), a plate 11 fixed to the end face of the bobbin 1 and the fixed iron core 5, and an exterior case 12 covering each member. .

Moreover, the magnetic circuit is comprised by the case 12, the board 11, the fixed iron core 5, the movable iron core 20, and the yoke 6. As shown in FIG.

Next, the operation of the solenoid valve device of the first embodiment will be described.

In the non-energization of the electromagnetic coil 2, the stress of the coil spring 9 acting on the rod 4 is greater than the hydraulic pressure of the control oil 31 from the input port 8a, and the valve portion 4a is a valve seat. The opening part 8c of (8) is closed, and the oil pressure of the control oil 31 in the input port 8a is output as an output pressure from the output part 33 at this time.

In this state, when electricity is supplied to the electromagnetic coil 2, a magnetic field is generated in the electromagnetic coil 2, and the movable iron core 20 causes the elastic force of the coil spring 9 and the fluid of the control oil 30 to be caused by the magnetic field. The resistance is attracted to the fixed iron core 5 side, and the clearance between the valve portion 4a of the rod 4 and the opening 8c of the valve seat 8 becomes large. As a result, from the input port 8a The flow rate of the control oil 31 which flows out into the discharge port 8b through the opening 8c of the filter increases, so that the oil pressure on the side of the input port 8a is lowered and the output portion 33 having the same pressure as the input port 8a. The output pressure from the furnace decreases. The output voltage of the output unit 33 in this case corresponds to the magnitude of the current of the electromagnetic coil 2.

However, when chattering is about to occur due to a change in the supply pressure of the control oil 31 supplied to the input port 8a, that is, the rod 4 moves in the direction of closing the opening 8c, the movable core 20 of the integral also moved in the same direction in that case, complete enhancement (a) with respect to movement of the movable iron core 20 has the yoke side complete fidelity (a _2), the fixed core side, complete enhancement of from (a ₁ Shock absorbing oil 30, which acts as) acts as a fluid resistance and the movement of the movable iron core 20, i.e., the movement of the rod 4, becomes smooth.

Similarly, when the rod 4 moves in the direction of opening the opening 8C, and the rod 4 and the movable iron core 20 integral with the rod 4 are also moved in the same direction, the shock absorbing chamber ( In A), the buffer oil 30 moving from the fixed iron core buffer chamber A ₁ to the yoke side buffer chamber A ₂ acts as a fluid resistance and moves the movable core 20, i.e., the rod 4 ) Will move slowly.

In addition, the passage cross-sectional area of the fastening portion 22a is larger than the flow passage cross-sectional area of the gap 23 having a void dimension of 0.6 mm or less, and the fastening portion 22a has a smaller fluid resistance than the gap 23, so The oil 30 mainly moves between the fixed iron core buffer chamber A ₁ and the yoke side buffer chamber A ₂ through the fastening portion 22a of the flow hole 22.

As described above, in this embodiment, the rod 4 is reciprocated gently by the buffering action of the buffer oil 30 in the buffer chamber A, the amplitude of the rod 4 is reduced, and It can suppress chattering.

In addition, when the temperature of the buffer oil 30 decreases, even if the fluid resistance of the buffer oil 30 increases as the viscosity of the buffer oil 30 increases, in this embodiment, the fastening portion 22a having a small flow passage cross section is small. The thickness dimension ¹ ₂ and the path dimension ¹ ₂ of the gap 23 are short, and the increase in the fluid resistance of the buffer oil 30 is suppressed as the flow path cross-sectional area decreases. When the fluid resistance of the solvent oil 30 becomes so large that the load 4 does not respond quickly and reliably to the fluctuation of the current value of the electromagnetic coil 2, it does not occur.

In addition, since the rod 4 responds quickly and reliably to changes in the current value of the electromagnetic coil 2 and suppresses the occurrence of chattering, the joint 21 having the protrusion 21a is fixed to the fixed iron core 5 and the yoke. The movable iron core 20 provided between (6) and a distribution hole 22 having a fastening portion 22a at its end is fixed to the rod 4, but either one of the movable iron cores having joints and distribution holes is provided. It may also be the case of installing.

In other words, by adjusting the size of the gap between the joint and the moving iron and the path length of the gap, the buffering force by the buffer oil against the change of the moving iron can be adjusted, and the rod responds quickly and reliably to prevent the occurrence of chattering. A solenoid valve device that can be suppressed can be obtained.

In addition, by adjusting the thickness of the fastening portion of the flow hole, the inner diameter of the flow hole, and the number of flow holes, the buffer force by the buffer oil against the fluctuation of the moving iron core can be adjusted, so that the rod responds quickly and reliably, and the chattering occurs. The solenoid valve device which can suppress the

Second Embodiment

Fig. 3 is a sectional view showing the configuration of the solenoid valve device of the second embodiment.

The solenoid valve device of this embodiment is used by depositing in oil in a tank (not shown) in which the height of oil level changes.

In this solenoid valve device, the communication hole 25 which the front end faced in the upper space of the yoke-side buffer chamber A ₂ is formed through the yoke 6, and the yoke-side buffer chamber A ₂ and the discharge port 8b are formed. Is communicated through the communication hole 25. A communication hole 24 having a front end facing the upper space of the fixed iron core buffer chamber A ₁ is formed through the fixed iron core 5 and the bobbin 1. The fixed iron core side buffer chamber A ₁ communicates with the outside via the communication hole 24.

In addition, this solenoid valve apparatus is provided so that the rod 4 may be horizontal, and the front end of the discharge port 8b extended upward is located above the communication hole 25. As shown in FIG.

This solenoid valve device is used by being deposited in oil in a tank (not shown) in which the height of the oil level changes, but during operation of the solenoid valve device, for example, the solenoid valve is temporarily exposed on the oil surface by a change in the height of the oil level in the tank. Oil in the buffer chamber A may flow out through the first bearing 6a, the second bearing 5a, or the like, and air may enter the buffer chamber A.

However, at this time, oil is supplied from the communication hole 25 when the solenoid valve device is immersed in oil again, and air is discharged from the communication hole 24. Therefore, the movable iron core 20 in the buffer chamber A is discharged. The long-term convection of air, which has a low buffering effect against fluctuations and adversely affects the suppression of chattering, is prevented, and the occurrence of chattering on the rod 4 can be suppressed.

In this solenoid valve device, the discharge port 8b extends upward and the tip end of the discharge port 8b is located above the communication hole 25 so that the oil in the shock absorbing chamber A of the solenoid valve device is increased. It is not discharged from the discharge port 8b to the outside through this communication hole 25.

In addition, the front end portion of the communication hole 24 faces the upper space in the fixed iron core buffer chamber A ₁ , where air is easy to convex, and the yoke side buffer chamber A, in which the same air is likely to convection, is also provided at the front end of the communication hole 25. ₂ ) The air temporarily convex in ₂ ) is replaced with the control oil 31 in the discharge port 8b through the communication hole 25.

(Third Embodiment)

Fig. 4 is a sectional view showing the construction of the third embodiment.

The form of this embodiment differs from the solenoid valve device of the second embodiment in that the communication hole 26 in which the distal end faces the yoke 6 in the lower space of the yoke-side buffer chamber A ₂ is different from the other components.

In this solenoid valve device, when the air convexed to the upper part in the yoke-side buffer chamber A ₂ is replaced with the control oil 31, the communication hole 26 becomes the introduction path of the control oil 31 and the communication hole 25 ) Becomes the discharge path of the air, and the air in the yoke-side buffer chamber A ₂ is smoothly replaced with the control oil 31 in the discharge port 8b as compared with the solenoid valve device of the second embodiment.

(Example 4)

Fig. 5 is a sectional view showing the construction of the fourth embodiment.

In the embodiment, the oil passage 27a is formed in the rod 27 along the axial direction of the rod 27. The first branch passing through the yoke-side buffer chamber A _{2 in} the middle of the oil passage 27a. A flow passage 27b ₁ is formed, and a second branch flow passage 27b ₂ is formed from the rear end of the oil passage 27a through the fixed iron core side shock absorbing chamber A ₂ . The same as in the second embodiment.

In addition, the rod 27 may use a hollow pipe, for example, and may block a rear end and may form the flow path orthogonal to an intermediate part.

In the solenoid valve device, the tip end of the oil passage 27a faces the input port 8a of the valve seat 8, and the control oil 31 from the input port 8a passes through the oil passage 27a and the first branch. It is discharged to the outside from the discharge port through the communication hole 25 through the yoke-side buffer chamber (A ₂ ) through the flow path (27b ₁ ). The control oil (31) from the input port (8a) 27a, through the second branch flow path 27b ₂ to the fixed iron core buffer chamber A ₁ , after which the control oil 31 is mainly a flow hole 22, a yoke side buffer chamber A ₂ , It is discharged to the outside from the discharge port 8b through the communication hole 25.

In this way, the control oil 31 is actively guided to the fixed iron core buffer chamber A ₁ and the yoke side buffer chamber A ₂ by the hydraulic pressure of the control oil 31 at the input port 8a. In (A), the oil is used as a buffer oil and is discharged to the outside of the buffer chamber A even if air enters the buffer chamber A.

In addition, although the communication holes 24 and 25 are formed in the form of this embodiment, the said rod 27 is applicable also to the solenoid valve which does not have the communication holes 24 and 25. In this case, the 1st bearing 6a, When oil in the buffer chamber A flows out through the second bearing 5a, the control oil 31 from the input port 8a is actively replenished by the hydraulic pressure in the buffer chamber A.

As described above, according to the solenoid valve device of the present invention, the movable iron core is provided with a fastening portion at the end and at the same time, a circulation hole for maintaining and moving the buffer oil according to the movement of the movable iron core formed along the axial direction. This flow hole is designed to adjust the buffering force by the buffering oil against the fluctuation of the movable iron core, thereby suppressing the occurrence of chattering and at the time of the temperature drop of the buffering oil which increases the fluid resistance. The load responds quickly and reliably to variations in the current value of the electromagnetic coil.

In addition, according to the solenoid valve device of the present invention, the movable iron core has a fastening portion installed at the end and is formed along the axial direction, and has a distribution hole for maintaining and moving the buffer oil according to the movement of the movable iron core. In addition, the joint has a protrusion that maintains the clamping function of the buffer oil protruding inward with an inner diameter smaller than the inner diameter of the fixed iron core and the yoke, and the buffering force is increased by the buffer oil against the fluctuation of the movable iron core by the protrusion and the distribution hole. It is possible to reliably suppress the occurrence of chattering, and at the same time, the load can be more quickly or more reliably responded to the fluctuation of the current value of the electromagnetic coil even when the temperature of the buffer oil in which the fluid resistance increases increases. Answer.

In addition, according to the solenoid valve device of the present invention, the buffer chamber and the discharge port communicate with each other through a communication hole formed in the yoke, so that when the buffer oil in the buffer chamber flows out, the buffer oil is supplied into the buffer chamber through the communication hole. In the buffer chamber, the buffering oil can maintain the buffering function against the fluctuation of the movable iron core.

Claims (3)

An electromagnetic coil, in which a magnetic field is generated by applying a current wound to the bobbin, a fixed iron core fixed to one end of the bobbin, a yoke made of a magnetic body fixed to the other end of the bobbin, and the fixed iron core A joint made of a nonmagnetic material which is fixed between the yoke and at the same time forms a fixed iron core and a buffer chamber for holding the buffer oil at the same time as the yoke, and the electronic coil is installed in the buffer chamber opposite to the fixed iron core. A movable iron core capable of moving within the buffer chamber suctioned by receiving the fluid resistance of the buffer oil on the fixed iron core side by suction force, and a rod portion having a valve portion integrally with the movable iron core inserted and inserted at the same time through the buffer chamber; A spring biasing the rod in a direction opposite to the electromagnetic attraction force installed at the rear end of the rod, an input port, and an exhaust port And while maintaining an opening communicating with the input port and the drain port according to the movement of the rod in the solenoid valve device in which the valve portion having a valve seat for opening and closing the opening and the connection and disconnection to the opening, The movable iron core is provided with a fastening portion at an end thereof and has a circulation hole in which the buffer oil moves in accordance with the movement of the movable iron core formed along the axial direction. The distribution hole has the buffer hole against the fluctuation of the movable iron core. A solenoid valve device, characterized in that the buffering force is adjusted by a solvent oil. According to claim 1, The joint has a protrusion projecting on the inside with an inner diameter smaller than the inner diameter of the fixed iron core and the yoke, the cushioning force is adjusted by the buffer oil against the fluctuation of the movable iron core by the protrusion. Solenoid valve device. The solenoid valve device according to claim 1 or 2, wherein the buffer chamber and the discharge port communicate with each other through a communication hole formed by a yoke.

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