JP2659317B2 - High-speed 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 solenoid valve for opening and closing a fluid by an electromagnet device, and more particularly to a high-speed operation solenoid valve which is designed to follow a high-speed repetitive operation.

[0002]

2. Description of the Related Art Conventionally, so-called solenoid valves for opening and closing a fluid by driving a valve body by an electromagnet device have been used in various fields. FIG. 5 shows a typical structure of such a solenoid valve. In the solenoid valve of FIG. 5, when the coil 33 is not energized, the movable iron core 39 is pressed down by the elastic expansion force of the return spring 46, and as a result, the valve element 48 attached to the lower end of the movable iron core 39 Abuts on the valve seat 47 to shut off the fluid flow path and close the valve. When the coil 33 is energized, the fixed iron core 34 is magnetized to generate a magnetic Coulomb force, so that the movable iron core 39 is attracted upward against the elastic expansion force of the return spring 46. The fluid flow path communicates from the inlet port 51 to the outlet port 52 at a distance from 47, and the valve is opened. When the energization of the coil 33 is stopped, the fixed iron core 34 and the movable iron core 39 are made of a soft magnetic material having small residual magnetization, so that the attraction force is lost and the valve is closed again by the elastic expansion force of the return spring 46.

FIG. 5 shows a two-port direct-acting type energized open type, which is the most typical solenoid valve. Based on this, depending on the application in which the solenoid valve is used,
Various modifications are also in practical use. For example, what is called a three-port type is one in which two outlet ports are formed and the communication destination from the inlet port is switched by the movement of the valve element. Also, what is called a pilot operated type,
By providing a pilot valve separate from the main valve that shuts off the fluid flow path, it is intended to open and close a large flow rate with small electric power, and is used in applications where the response speed is not strictly required. In contrast, what is called an energized closed type is one in which the shape of the iron core is devised so that the valve is closed when the coil is energized, which is opposite to that of FIG. If used for applications, power consumption can be saved.

[0004]

However, in the field of, for example, automatic looms, the demand for response speed is extremely severe, and it is necessary to follow an opening / closing operation several tens of times per second.
That is, in an automatic loom, the weft is inserted by a water jet, and such intermittent water injection is performed by opening and closing a valve. In recent years, the speed of an automatic loom has been required to be higher, and an opening / closing frequency of about 20 times / second has been required. And it is not easy to follow this with a solenoid valve. The direct-acting solenoid valve has better responsiveness than the pilot-operated solenoid valve described above, but it still has a limit of about several times per second and cannot respond to the demand for response speed. In the case of such a high-speed repetitive operation,
The life of the sliding parts also becomes a problem.

Here, as for a method of increasing the response speed of the solenoid valve, the valve-opening operation and the valve-closing operation (considering the open-type solenoid valve at the time of energization) will be considered separately. First, in the valve opening operation, for example: 1. Reduce the weight of the movable part (the movable core and the valve attached to the tip). 2. Reduce sliding friction of moving parts. 3. Reduce the spring expansion force of the return spring. 4. Strengthen the magnetic force generated by the coil. For example, the saturation magnetization of the iron core may be increased.

In the valve closing operation, for example, 1 '. Reduce the weight of the movable part 2 '. Reduce sliding friction of movable part 3 '. Enhance the elastic expansion force of the return spring 4 '. Reduce the magnetic force generated by the coil 5 '. It is conceivable to reduce the residual magnetization of the iron core.

Here, 1. And 1 '. 2. And 2 '.
Is common to the valve opening operation and the valve closing operation. And 3 '. 4. And 4 '. Are mutually contradictory. And 5. And 5 '. Is independent for the time being. Therefore, 1. (1 ′.), 2. (2 ′.), 5. , And 5 '. Thus, the response speed of the solenoid valve can be improved to some extent. And 3 '. And 4. And 4 '. Of the valve opening operation and the valve closing operation are alternatives. On the other hand, in the above-described high-speed repetitive operation, high-speed operation is required for both the valve-opening operation and the valve-closing operation, and it is difficult for the electromagnetic valve to follow this.

[0008] Of the factors listed here, the most fundamental one is 5 '. Of the residual magnetization. As the core of the electromagnet, it is necessary to select a material whose magnetic susceptibility is higher than a certain degree, and among those kinds of materials, those with small remanent magnetization are called soft magnetic materials.
There is no such that the remanent magnetization is zero. When the movable core is attracted to the fixed core, they are in close contact with each other, so that the distance between the two magnetic poles is very short.
Therefore, even if the coil is de-energized from this state and only a slight residual magnetization remains in the iron core, the attractive force between the two iron cores becomes considerable by Coulomb's inverse square law. This greatly affects the initial speed of the valve closing operation of the solenoid valve. In addition, since the elastic expansion force of the return spring must be large in order to resist the attractive force due to the residual magnetization, the above-mentioned 3. On the contrary, it also affects the response speed of the valve opening operation.

Next, the problem of the life of the solenoid valve will be considered. The movable iron core 39 in FIG. 5 slides inside the guide sleeve 35 inserted inside the cylindrical coil bobbin around which the coil 33 is wound. Such a guide sleeve 3
Numeral 5 is for effectively transmitting the magnetic flux generated when the coil 33 is energized to the movable iron core, and therefore must be made of a non-magnetic material. For example, a SUS304 (austenitic stainless steel) tube or the like is used. . Therefore, wear of the sliding portion of the movable iron core 39 becomes a problem. On the other hand, conventionally, a non-magnetic bearing material 49 having a thickness of about 1 mm has been fitted on the sliding surface of the movable iron core 39 to prevent an increase in sliding resistance due to magnetic attraction with the guide sleeve 35. Is being done. However, a resin material frequently used as the bearing material 49 generally wears out early because it is not excellent in abrasion resistance, and the life cannot be secured.

Further, the guide sleeve 35 and the block 4
The vicinity of the welded portion 2 is deformed due to the welding, and since there is a surplus 43 at the welding location, the bearing material 49 is severely cut by the deformation and the surplus 43. Of course, in order to reduce the wear of the bearing material 49, the inner surface of the guide sleeve 35 is finished to a roughness of about 0.85 by polishing, but it is difficult to perform polishing after welding. If the operation of the solenoid valve is a high-speed repetitive operation, such cutting is extremely severe, and the life of the bearing material 49 is extremely shortened.
Here, for example, as shown in FIG. 6, it is possible to adopt a trumpet-shaped guide sleeve 36 to separate the welded portion from the sliding surface of the movable iron core. Is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made to speed up the valve closing operation without strengthening the return spring which hinders the speeding up of the valve opening operation, and thereby to perform both the opening and closing operations of the valve. To provide a high-speed operation solenoid valve suitable for high-speed repetitive operation by enabling high-speed operation and eliminating the unnecessary cutting in the sliding part without extending the guide sleeve into a special shape and extending the service life. With the goal.

[0012]

In order to achieve the above object, a high-speed operation solenoid valve according to the present invention comprises a cylindrical bobbin provided in a frame, a coil wound around the bobbin,
A cylindrical guide sleeve fixed together with a fixed core in a bobbin, a movable core slidably inserted in the guide sleeve, a sliding member fitted on the outer peripheral surface of the movable core, a movable core and a frame The movable spring is opened and closed by a return spring which is sandwiched between the movable core and biases the movable iron core away from the fixed iron core, and a valve body fixed to an end of the movable iron core opposite to the end facing the fixed iron core. An electromagnetic valve, wherein a lower end of the sliding member in a state where the movable iron core is separated from the fixed iron core is located above a welded portion between an end of the guide sleeve opposite to the fixed iron core and the frame. The configuration is characterized by the following.

[0013] Alternatively, a high-speed operation solenoid valve of the present invention comprises a cylindrical bobbin disposed in a frame, a coil wound around the bobbin, and a cylindrical guide fixed in the bobbin together with a fixed iron core. A sleeve, a movable core slidably inserted into the guide sleeve, a sliding member fitted on the outer peripheral surface of the movable core, and a movable core held between the movable core and the frame to separate the movable core from the fixed core. A solenoid that opens and closes the valve with a return spring that urges it in the direction in which it moves, and a valve element that is fixed to the end of the movable iron core opposite to the side facing the fixed iron core. A plate-like member, which is an elastic body that is to be expanded in the vertical direction, is inserted between the movable iron core and the fixed iron core. Further, in the high-speed operation solenoid valve according to the present invention, the free thickness of the plate-shaped member is smaller than an interval between the movable core and the fixed core when the movable core is separated from the fixed core. Configuration.

[0014]

In the high-speed operating solenoid valve according to the present invention having the above-mentioned structure, when the coil is not energized, the movable core is separated from the fixed core by the elastic expansion force of the return spring and the plate-like member, and the end of the movable core is The valve is closed by a valve body fixed to the valve. When the coil is energized, the fixed core is magnetized, so that the movable core slides in the guide sleeve and is attracted to the fixed core, and the valve is opened. When the coil is turned off,
The valve returns to the closed state due to the elastic expansion force of the return spring and the plate member.

At this time, since the welding portion between the guide sleeve and the frame is outside the sliding range of the sliding portion of the movable core, the sliding portion of the movable iron core is not cut by the extra welding portion and is movable. Long life of iron core. Further, since the non-magnetic plate-shaped member is sealed between the fixed iron core and the movable iron core, the close contact between the fixed iron core and the movable iron core can be prevented even when the coil is energized. Therefore, a gap between the fixed iron core and the movable iron core is secured, so that the residual attraction force due to the residual magnetization when the power is cut off is extremely small, and the valve closing operation is quickly started by the elastic expansion force of the return spring and the plate member. In addition, since the free thickness of the plate member is smaller than the distance between the movable core and the fixed core when the coil is not energized, the elastic expansion force of the plate member does not hinder the start of the valve opening operation. The operation is also quick.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a high-speed solenoid valve according to the present invention will be described below with reference to the drawings. First, for ease of understanding, the configuration and operation of the entire solenoid valve will be described, and then, the features of the present invention will be described. FIG.
FIG. 2 is a cross-sectional view of the high-speed operation solenoid valve 1 according to the present embodiment in a closed state. The high-speed operation solenoid valve 1 shown in FIG. 1 includes an upper half solenoid section 10 and a lower half body 20, and the feature of the present invention is included in the solenoid section 10.

Therefore, the structure of the solenoid unit 10 will be described first. At the center of the solenoid portion 10 is a coil 3 formed by winding a conductive wire around the body of a hollow cylindrical coil bobbin 2 having flanges at both ends. A fixed iron core 4 and a hollow cylindrical guide sleeve 5 are fitted into the hollow portion of the coil bobbin 2, and the fixed iron core 4 and the guide sleeve 5 are welded at a welding portion 6. Since the fixed iron core 4 is fixed to the upper frame 8 on which the coil bobbin 2 is fixed by the bolt 7, the coil bobbin 2, the fixed iron core 4, and the guide sleeve 5 are fixed to each other.

A movable iron core 9 is provided inside the guide sleeve 5.
Are slidably fitted and held. Of the movable iron core 9,
The outer peripheral surface, which is a sliding surface with the inner surface of the guide sleeve 5, is covered with a bush 11 made of resin or the like in order to reduce friction loss due to sliding. The lower end of the guide sleeve 5 is welded to the middle frame 12, and the welding portion 13 is located below the lower end of the bush 11 in the figure. The middle frame 12 also has a role of connecting the upper frame 8 and the body 20.

A return spring 16 is sandwiched between the flange 15 at the outer periphery of the lower end of the movable core 9 and the middle frame 12, and the movable core 9 is constantly urged downward by the elastic expansion force of the return spring 16. . At the lower end of the movable iron core 9, a valve element 18 that is in contact with a valve seat 17 described later is fixed. Between the upper end of the movable iron core 9 and the fixed iron core 4, a nonmagnetic remanence killer 19, which is a plate-like member having elastic expansion force, is inserted. Below the solenoid unit 10 having the above configuration,
The body 20 is combined. An inlet port 21 and an outlet port 22 are formed on both sides of the body 20, and a valve seat 17 that contacts the valve element 18 is formed in the center. As described above, the solenoid valve 10 and the body 20 constitute the high-speed operation solenoid valve 1.

Next, the operation of the high-speed operation solenoid valve 1 having the above configuration will be described. First, the cross-sectional view of FIG. 1 shows a state where the coil 3 of the high-speed operation solenoid valve 1 is not energized. In this state, the movable iron core 9 is urged downward by the elastic expansion force of the return spring 16, is separated from the fixed iron core 4, and the valve element 18 fixed to the lower end of the movable iron core 9 contacts the valve seat 17. , The communication between the inlet port 21 and the outlet port 22 is cut off. That is, the valve is in a closed state. Coil 3
, The stationary core 4 is magnetized and the movable core 9 is attracted upward. For this reason, the movable iron core 9 moves upward against the elastic expansion force of the return spring 16 and the remanence killer 19, and the valve element 18 separates from the valve seat 17, and the inlet port 21 and the outlet port 22 Communicate, and the valve opens. FIG. 2 shows a cross-sectional view in this state. When the energization of the coil 3 is stopped, the fixed core 4, which is a soft magnetic material, loses magnetization, and the movable core 9 returns to the state of FIG. 1 due to the elastic expansion force of the return spring 16 and the remanence killer 19. The above is the configuration and operation of the high-speed operation solenoid valve 1 as a whole.

Next, a description will be given of the remanence killer 19, which is the first main part of the high-speed operation solenoid valve 1 having the above-described overall configuration and operation, as the first main part of the present invention. FIGS. 3A, 3B show a perspective view, a plan view, and a side view of the remanence killer 19.
It is shown in (c). The remanence killer 19 is a C-shaped elastic plate-shaped member made of a non-magnetic material such as copper, and has a twist in the thickness direction. Such a residual magnet killer 19
Is inserted between the fixed iron core 4 and the movable iron core 9 in the high-speed operation solenoid valve 1, and when the coil 3 is energized, that is, when the movable iron core 9 is attracted to the fixed iron core 4, And a function of assisting the elastic expansion force of the return spring 16 when the coil 3 is turned off, that is, at the start of the valve closing operation.

First, the function of the remanence killer 19 for preventing the fixed core 4 and the movable core 9 from adhering to each other will be described. When there is no remanence killer 19, that is, in the conventional solenoid valve, when the coil 3 is energized, the fixed iron core 4 and the movable iron core 9 are in close contact with each other, so the distance between the two magnetic poles is very small. Therefore, the residual attraction force due to the minute residual magnetization remaining in the iron core cannot be ignored even when the power is turned off, which has hindered the speeding up of the valve closing operation. In the high-speed operation solenoid valve 1 of the present embodiment, the function of the remanence killer 19 prevents the fixed iron core 4 and the movable iron core 9 from sticking to each other. Therefore, the remanence killer 19 must be a non-magnetic material that does not itself magnetize, and in this embodiment, a phosphor bronze plate is used. Of course, any material other than the phosphor bronze plate may be used as long as it is a non-magnetic material and has the elasticity described below. Examples of such a material other than phosphor bronze include austenitic stainless steel.

Subsequently, the return spring 16 of the remanence killer 19
The function of assisting the bullet expansion force will be described. As described above, the remanence killer 19 is an elastic body, and has a twist in the thickness direction, and thus acts as a leaf spring. Coil 3
At the time of energization, it is pressed by both iron cores to be attracted, and has a flat plate shape. However, when the energization of the coil 3 is turned off, the return spring 16 tries to separate the two cores by the elastic expansion force as a leaf spring. It assists in expanding the bullet. This also contributes to speeding up the valve closing operation, as well as the function of preventing the close contact.

Further, since the free thickness of the remanence killer 19 is smaller than the maximum distance between the two cores, that is, the distance when the valve element 18 is in contact with the valve seat 17, the distance between the two remanence killers 19 is small. After the free thickness becomes larger than the free thickness, the movable iron core 9 is driven by the elastic expansion force of only the return spring 16, but at this time, the interval between the two iron cores is so large that the residual attraction force due to the residual magnetization is reduced. Has little effect. This also means that the impact when the valve element 18 contacts the valve seat 17 is small, so that the valve element 18 and the valve seat 1
7 can be small, which contributes to prolonging the life of the high-speed operation solenoid valve 1.

Further, the remanence killer 19 contributes to speeding up the valve opening operation of the high-speed operation solenoid valve 1. That is,
At the start of the valve opening operation, the elastic expansion force of the remanence killer 19 does not work, so that the attraction force due to the magnetization of the iron core only needs to resist the elastic expansion force of the return spring 16. In particular, at the start of the valve opening operation, the distance between the iron cores is considerably large, and the suction force is small according to the inverse square law. When the gap between the two cores becomes smaller than the free thickness of the remanent killer 19 due to the progress of the valve opening operation, the elastic expansion force of the remanent killer 19 acts, but at this time, the attractive force is sufficiently large. The movable iron core 9 moves upward against the elastic expansion force of the return spring 16 and the remanence killer 19 and presses the remanence killer 19. Also at this time, the presence of the remanent magnetic killer 19 reduces the contact impact between the two cores, contributing to a longer life. Thus, the remanence killer 19 contributes to speeding up both the valve closing operation and the valve opening operation, and also indirectly contributes to a longer life.

Here, the structure of the movable iron core 9 in this embodiment will be described. FIG. 4 shows a sectional view of the movable iron core 9. A bush 11, which is a non-magnetic material, is fitted to the movable iron core 9 to prevent the movable iron core 9 and the guide sleeve 5 from magnetically attracting and causing sliding resistance.
It does not come into direct contact with the guide sleeve 5 and slide. In this embodiment, the bush 11 is 0.8 m.
Although a resin having a thickness of m is used, a non-magnetic material other than the resin may be used, and a material having a low frictional resistance is desirable. The valve body holding portion 23 formed at the left end in FIG.
, The valve element 18 is fixed.

At the center of the movable iron core 9, a ventilation port 24 is formed. Further, a ventilation hole 25 communicating the ventilation port 24 with the outside, that is, the entrance port 21, is formed near the valve body holding portion 23. The reason why the ventilation port 24 and the ventilation hole 25 are provided is that the space between the fixed iron core 4 and the movable iron core 9 is not airtight. Since the volume of the space is changed by the movement of the movable core, if the space is airtight, the movement of the movable core 9 is hindered by a change in pressure. In the present embodiment, this adverse effect is prevented by the ventilation port 24 and the ventilation hole 25.

Next, the welded portion 13 between the lower end of the guide sleeve 5 and the middle frame 12, which is the second main part of the high-speed operating solenoid valve 1 according to the present invention, will be described. In the high-speed operation solenoid valve 1, as shown in FIGS.
Welding point 1 between lower end of guide sleeve 5 and middle frame 12
Reference numeral 3 exists below the lowermost end within a range in which the bush 11 of the movable iron core 9 can move. The welding portion 13 is indispensable for transmitting the magnetic flux generated by the coil 3 to the fixed iron core 4 without leakage. However, the welding portion 13 inevitably undergoes deformation and overburden at the time of welding. To
If this exists within the sliding range of the bush, the bush will be cut with the sliding operation. Especially when high-speed repetitive operation is performed, the bush damage due to this cutting is remarkable,
The life of the solenoid valve becomes extremely short.

Here, for example, as shown in FIG. 6, the guide sleeve 36 can be formed into a trumpet shape to separate the welded portion from the sliding surface of the movable iron core. However, the guide sleeve 36 is formed into a trumpet shape. A step of performing Therefore, in the high-speed operation solenoid valve 1, the welding portion 13
Is arranged outside the sliding range of the bush 11, so that the guide sleeve does not need to be formed into a special shape, the bush 11 is not cut by the welded portion 13, and the durability to withstand high-speed repetitive operation is provided. I have.

As described above, in the high-speed operation solenoid valve 1 of the present embodiment, the function of the remanence killer 19 and the welding portion 13 between the lower end of the guide sleeve 5 and the middle frame 12 are set outside the sliding range. Thus, the opening / closing operation of the valve is accelerated, and the durability of each moving part is improved, thereby enabling a high-speed repetitive operation. This allows, for example,
It has become possible to use a solenoid valve in a field requiring an opening / closing frequency of about 20 times / second, such as a water jet mechanism of an automatic loom. The embodiments do not limit the present invention, and various modifications and improvements can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the present invention is applied to a two-port type direct-acting open solenoid valve when energized, but the present invention is also applied to a three-port type or closed solenoid valve when energized. Good. The pilot-operated solenoid valve is not originally intended for high-speed operation, but there is no particular hindrance to the application of the present invention.

[0031]

As is apparent from the above description, in the high-speed operating solenoid valve of the present invention, the solenoid valve drives the valve body to open and close the port. Since it has a plate-shaped member that is a non-magnetic elastic body that is inserted, both the valve-opening operation and the valve-closing operation are quick, and the valve seat and the valve body, the movable iron core and the fixed iron core, etc. It can be used in applications requiring high-speed repetitive operation, such as an automatic loom, with less damage to the contact points. In addition, since the welding point between the lower end of the guide sleeve and the block is outside the sliding range, it is not necessary to form the guide sleeve in a special shape, and it is possible to prevent cutting of the bush due to the excess of the welding point, and therefore, high-speed repetitive operation. It has a long service life. As described above, it is possible to provide a high-speed operating solenoid valve suitable for applications requiring high-speed repetitive operation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a high-speed operation solenoid valve according to an embodiment of the present invention in a closed state.

FIG. 2 is a sectional view showing an open state of the high-speed operation solenoid valve shown in FIG. 1;

FIG. 3 is a diagram illustrating a remanence killer used in the high-speed operation solenoid valve shown in FIGS. 1 and 2;

FIG. 4 is a view illustrating a structure of a movable iron core used in the high-speed operation solenoid valve shown in FIGS. 1 and 2;

FIG. 5 is a sectional view showing a configuration of a conventional solenoid valve.

FIG. 6 is a sectional view showing a configuration of a conventional solenoid valve.

[Explanation of symbols]

 2 bobbin 3 coil 4 fixed iron core 5 guide sleeve 8 upper frame 9 movable iron core 12 middle frame 13 welded part 16 return spring 18 valve element 19 residual magnetic killer

Claims (3)

(57) [Claims] 1. A cylindrical bobbin disposed in a frame, a coil wound around the bobbin, a cylindrical guide sleeve fixed together with a fixed iron core in the bobbin,
A movable iron core slidably inserted into the guide sleeve,
A sliding member fitted to the outer peripheral surface of the movable core, a return spring sandwiched between the movable core and the frame and biasing the movable core away from the fixed core; and a return spring facing the fixed core of the movable core. A solenoid valve that opens and closes the valve with a valve body fixed to the end opposite to the side, wherein a lower end of the sliding member in a state where the movable core is separated from the fixed core is fixed to the guide sleeve. A high-speed operating solenoid valve, which is located above a welding point between an end of the core opposite to the core and the frame. 2. A cylindrical bobbin disposed in a frame, a coil wound on the bobbin, a cylindrical guide sleeve fixed together with a fixed iron core in the bobbin,
A movable iron core slidably inserted into the guide sleeve,
A sliding member fitted to the outer peripheral surface of the movable core, a return spring sandwiched between the movable core and the frame and biasing the movable core away from the fixed core; and a return spring facing the fixed core of the movable core. In a solenoid valve which opens and closes a valve with a valve body fixed to an end opposite to the side, a plate-shaped member which is a non-magnetic body and an elastic body which intends to expand in a thickness direction is provided with the movable iron core. A high-speed actuated solenoid valve which is inserted between the fixed iron core. 3. The high speed as set forth in claim 2, wherein the free thickness of the plate-shaped member is smaller than the distance between the movable core and the fixed core when the movable core is separated from the fixed core. Actuated solenoid valve.