JP2579832Y2 - 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 liquid by an electromagnet device, and more particularly, to a solenoid valve suitable for high-speed operation necessary for switching high-pressure water for weft skipping in a water jet type automatic loom. About.

[0002]

2. Description of the Related Art Heretofore, a so-called electromagnetic valve for opening and closing a liquid which is frequently used in various fields by driving a valve body by an electromagnet device is also used in a water jet type automatic loom. In the water jet type automatic loom, when the weft yarn is delivered, high-pressure water is jetted instantaneously at a high speed, thereby inserting the weft yarn. Therefore, in order to open and close the injection of high-pressure water at high speed, this is opened and closed by an electromagnetic valve.

That is, as shown in FIG. 5, a high pressure pump 62 for applying high water pressure to water from a water source 60 and forcing the water to nozzles 61A and 61B is provided.
The electromagnetic valves 63A and 63B are arranged between the electromagnetic valves 63A and 63B. The nozzles 61A and 61B have water and a yarn roll 64 in addition to water.
Weaving yarns A and B for weft are supplied from A and 64B. When the electromagnetic valve 63A is opened and the high-pressure pump 62 is operated at the same time, high-pressure water is jetted from the nozzle 61A, whereby the thread A can be inserted. After the thread A is inserted several times, the thread B is inserted several times.
The number of times the thread A and thread B are inserted is usually about 1 to 15 times, and varies depending on the type of cloth, and thus is not constant, and a series of operations are performed by a programmed controller. Here, a solenoid valve is used to select a nozzle for selectively using the yarn A and the yarn B. Since the weft thread is inserted at predetermined regular intervals of 10 to 20 times per second, the switching between the yarn A and the yarn B needs to be completed in a short time.

[0004] Therefore, the demand for the response speed of the solenoid valve used here is extremely severe. This is because if the response speed is low, the weft cannot be inserted sufficiently. In recent years, the speed of the automatic loom has been required to be higher from the viewpoint of productivity improvement, and an opening / closing frequency of about 20 times / second has been required. For this reason, various devices have been devised to increase the response speed and to extend the service life of the sliding portion.

[0005]

However, in the case of a solenoid valve used in a water jet type automatic loom, not only is it required to speed up individual opening and closing operations during continuous operation,
It is also required to reduce the time required for the operation to be stabilized when the operation is started from the halt state. Most of the conventional measures for speeding up are related to the former speeding up, and there is almost no way to the latter. Therefore, the following problems have not been solved in the conventional high-speed solenoid valve. The solenoid valve in the water jet type automatic loom is not always operated, and a downtime occurs for various reasons. The downtime may be caused by cutting or supplementing the yarn. However, when the operation is resumed after the suspension time, the water system is in an unstable state, and a warm-up operation is required.

Here, the reason why it takes time to stabilize the operation at the start of the operation, and what kind of problem it has will be specifically described. For this reason, FIG. 6 is a sectional view showing the structure of a conventional solenoid valve. The solenoid valve of FIG.
Is supplied with water through a high-pressure pump 62 in FIG. 5, and an output port 86 is also provided with a nozzle 61A or 61B.
It is connected to the. In such an electromagnetic valve, when the coil 80 is not energized, the movable iron core 82 is urged downward in the drawing by the elastic expansion force of the return spring 87, and the valve body 83 is thereby moved to the valve seat 8.
The communication between the input port 85 and the output port 86 is cut off by contacting the input port 85 with the input port 85.

When the coil 80 is energized, the fixed iron core 81 and the movable iron core 82 are attracted by the electromagnetic force as shown in FIG. 7, and the valve body 83 is separated from the valve seat 84 so that the input port 85 and the output port 86 are separated. And communicate. At this time, the high-pressure pump 62 is simultaneously driven to generate a high water pressure, and the nozzle 6
High-pressure water is injected from 1A or 61B, and the weft thread is inserted. However, if the valve closing state continues, bubbles may be generated in the internal space of the solenoid valve. This is because when the valve is closed, there is no water flow in the solenoid valve, and therefore, it is inevitable that dissolved air in the water is bubbled.

In particular, when high-pressure water is applied and water accelerated at a high speed is locally depressurized in the contraction portion in the flow path, bubbles in the stored air are likely to occur. In addition, when the Joule heat of the coil 80 or the heat generated by other driving parts of the water jet type automatic loom is transmitted and the water temperature rises, gas solubility generally decreases, which may lead to generation of bubbles. When such bubbles exist, when the high-pressure pump 62 is driven, the pressure rise is absorbed by the volume change of the bubbles, and the nozzle 61A
Alternatively, the water pressure at 61B does not rise sufficiently, so that the jet water does not fly well and the weft cannot be inserted. For this reason,
When trying to insert the weft thread after the rest state continues, it is necessary to perform a warming-up operation in which the opening and closing of the solenoid valve and the driving of the high-pressure pump 62 are performed several times to expel air bubbles and then insert the weft thread. was there.

There is a relatively large space in the solenoid valve especially near the return spring 87 indicated by an arrow in FIG. Such a space is a dead space in the form of a dead end, and the return spring 87 itself also impedes the flow of water, so that little water flows even when the valve is opened, so that the air bubbles accumulated in such a portion are not easily displaced. For this reason, several tens of blank shots were required before the weft thread could be actually inserted. For this reason, no matter how fast the opening / closing operation of the solenoid valve itself is made, the effect is largely impeded, and the productivity of the water jet automatic loom has not been sufficiently improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a structure in which a dead space in a solenoid valve is reduced and a water flow is easily induced in such a portion, so that bubbles are generated. It is an object of the present invention to provide an electromagnetic valve that can be expelled early, thereby speeding up the stability of water injection after a downtime, and greatly improving the productivity of a water jet type automatic loom.

[0011]

In order to achieve the above object, a solenoid valve according to the present invention comprises a body in which an input port, an output port and a valve seat are formed, and a conductor wound around a cylindrical bobbin. A coil, a cylindrical guide sleeve fixed together with a fixed core in a bobbin, a movable core slidably inserted in the guide sleeve, and fixed to an end of the movable core opposite to a side facing the fixed core. A solenoid valve that energizes the coil and attracts the movable core to the fixed core to separate the valve seat from the valve body and communicate the input port and the output port. A return spring that is held between the fixed core and biases the movable core away from the fixed core; and a collar member that is inserted between the movable core and the body. Configuration. Further, the solenoid valve according to the present invention has the above-mentioned configuration characterized in that it has a groove formed in the collar member for inducing a circumferential water flow.

[0012]

In the high-speed operation 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 is fixed to the end of the movable core. The valve body is closed when the valve body abuts against a valve seat formed in the body. At this time, since the collar member is inserted around the movable iron core of the body and the gap between the movable iron core and the body is minimized, the accumulation of bubbles in the gap is minimized.

When the coil is energized, the stationary core and the movable core are magnetized, so that the movable core slides in the guide sleeve against the elastic expansion force of the return spring and is attracted to the fixed core,
The valve opens. At this time, since the return spring normally held between the fixed iron core and the body is held between the fixed iron core and the movable iron core, there is no obstruction to the water flow in the gap between the fixed iron core and the body. Since a groove that induces water flow in the circumferential direction is formed in a spiral shape,
Bubbles in such gaps are expelled early by the water flow.
When the coil is turned off, the valve returns to the closed state due to the elastic expansion force of the return spring.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a solenoid valve according to an embodiment of the present invention; First, for convenience of understanding, the configuration and operation of the entire solenoid valve will be described, and then the characteristic portions of the present invention will be described. FIG. 1 is a cross-sectional view of the solenoid valve 1 according to the present embodiment shown in a closed state. FIG.
The electromagnetic valve 1 shown in FIG. 1 includes an upper half solenoid portion 30 and a lower half body 20.

The structure of the solenoid 30 will be described first. The outer shape of the solenoid portion 30 is defined by the upper frame 23 and the middle frame 12.
2 has a role of connecting the upper frame 23 and the body 20. A hollow cylindrical coil bobbin 11 having flanges at both ends is fixedly provided at the center of the upper frame 23. The body has a coil 13 formed by winding a conductive wire. A fixed core 16 and a hollow cylindrical guide sleeve 19 are fitted into the hollow portion of the coil bobbin 11, and the fixed core 16 and the upper end of the guide sleeve 19 are fixed by welding. Since the fixed iron core 16 is fixed to the upper frame 23 by the bolts 14, the coil bobbin 1
1, the fixed iron core 16 and the guide sleeve 19 are fixed to each other.

The lower end of the guide sleeve 19 is welded to the middle frame 12 at a welding point 15. The movable iron core 8 is slidably fitted and held inside the guide sleeve 19. The return spring 3 is sandwiched between the upper end of the movable core 8 and the lower end of the fixed core 16, and the movable core 8 is constantly urged downward by the elastic expansion force of the return spring 3. At the lower end of the movable iron core 8, a valve body 18 that is in contact with a valve seat 17 described later is fixed. Also,
A bush 24 that reduces sliding friction with the guide sleeve 19 is attached to the outer periphery of the movable iron core 8. Further, a remanent magnet killer 26 which is a C-shaped thin plate-shaped non-magnetic member is sandwiched between the fixed core 16 and the movable core 8 to prevent the fixed core 16 and the movable core 8 from excessively approaching each other. In.

The body 20 is combined below the solenoid portion 30 having the above configuration. Body 20
, An input port 21 and an output port 22 are bored on both sides, and a valve seat 17 that contacts the valve element 18 is formed in the center. The collar member 2 is fitted at a position 4 surrounding the outer periphery of the lower end of the movable iron core 8 of the body 20. The detailed structure and function of the collar member 2 will be described later. As described above, the solenoid valve 1 is configured by the solenoid unit 30 and the body 20.

Next, the basic operation of the solenoid valve 1 having the above configuration will be described. First, the cross-sectional view of FIG. 1 shows a state where the coil 13 of the solenoid valve 1 is not energized. In this state, the movable core 8 is urged downward by the elastic expansion force of the return spring 3, is separated from the fixed core 16, and the valve element 18 fixed to the lower end of the movable core 8 abuts on the valve seat 17. , The communication between the input port 21 and the output port 22 is cut off. That is, the valve is in a closed state.

When the coil 13 is energized, the fixed core 16 and the movable core 8 are magnetized, and the movable core 8 is attracted upward. Therefore, the movable core 8 moves upward against the elastic expansion force of the return spring 3, the valve element 18 is separated from the valve seat 17, the input port 21 and the output port 22 communicate, and the valve is opened. Becomes FIG. 2 shows a cross-sectional view in this state. At this time, since the remanence killer 26 is sandwiched between the fixed iron core 16 and the movable iron core 8, the two cores are prevented from coming into close contact with each other.

When the energization of the coil 13 is stopped, the fixed iron core 16 and the movable iron core 8, which are soft magnetic materials, lose their magnetization, so that the movable iron core 8 returns to the valve-closed state shown in FIG. When the valve is open, the fixed core 16 is
Since the close contact between the armature and the movable iron core 8 is prevented, the start of the valve closing operation is prompt. Fixed core 16 without residual magnet killer 26
This is because, in the case of an electromagnetic valve in which the movable core 8 and the movable core 8 are in close contact with each other, the start of the valve closing operation is delayed due to residual magnetization remaining in the iron core after the energization is cut off. That is, the remanence killer 26 is
This is to speed up the valve closing operation of the solenoid valve 1. The overall configuration and basic operation of the solenoid valve 1 have been described above.

Next, features of the solenoid valve 1 having the above-described overall configuration and basic operation will be described. In the solenoid valve 1, as described above, the body 2
The collar member 2 is fitted at a position 4 surrounding the outer periphery of the lower end of the movable iron core 8 of the zero. The first purpose of inserting the collar member 2 is to reduce dead space in the solenoid valve. That is, there is a large dead space inside the conventional solenoid valve shown in FIGS. 6 and 7 at the position shown by the arrow, and as described above, the air bubbles accumulated here have caused a problem at the start of operation. The first object is to eliminate such a dead space.

In the solenoid valve 1 shown in FIGS. 1 and 2, the dead space is made very small because the collar member 2 is inserted. Here, in a conventional solenoid valve, this position is usually a position where the return spring 87 is arranged, but in the solenoid valve 1, the return spring 3 is connected to the movable iron core 8.
By arranging between the upper end and the fixed iron core 16 lower end,
The collar member 2 can be inserted. Therefore, in the solenoid valve 1, even if the valve close state continues for a long time, the amount of accumulated air bubbles is very small.

The collar member 2 has a cylindrical shape with a groove 7 formed on the lower surface as shown in the perspective views of FIGS. 3 (a) and 3 (b). The groove 7 will be described later. The outer diameter of the collar member 2 is such that the outer diameter of the collar member 2 fits into the inner diameter of the position 4 surrounding the outer periphery of the lower end of the movable core 8 of the body 20 and the inner diameter of the portion 5 below the welded portion 15 of the middle frame 12 without any gap. It is made to be. This is because, if there is a minute gap between them, it is very difficult to remove the bubbles once the bubbles have entered the gap. In FIG. 3A, a step 6 is formed on the outer peripheral surface of the collar member 2. However, when the inner diameter of the position 4 is equal to the inner diameter of the lower part 5, the step 6 is unnecessary.

The inner diameter of the collar member 2 is made slightly larger than the outer diameter near the lower end of the movable core 8. Because the collar member 2 and the movable core 8 are in close contact,
This is because the movable core 8 cannot move up and down. If the gap between the inner circumference of the collar member 2 and the outer circumference near the lower end of the movable iron core 8 is too large, the elimination of dead space is insufficient. On the other hand, if the gap is too small, the water flow in the gap becomes poor. It is not possible to expel air bubbles quickly.
Therefore, the thickness of the collar member 2 must be determined in consideration of both.

In the solenoid valve 1, the shape of the movable iron core 8 is also devised in order to more completely eliminate the dead space by the collar member 2. First, a flange 88 for holding a return spring 87 is formed on the movable iron core 82 of the conventional solenoid valve shown in FIG. In contrast, FIG.
The movable iron core 8 of the solenoid valve 1 shown in FIG. This is to prevent the dead space from increasing due to the width of the flange. Usually, such a collar has a width of about 1 mm.
The gap between the inner circumference of the movable iron core and the outer circumference near the lower end of the movable core 8 is not excessively small, and the water flow in the gap does not deteriorate.

The movable core 8 has a holding portion 9 for holding the return spring 3 between the movable iron core 8 and the fixed iron core 16. Further, when the movable core 8 is sucked into the fixed core 16, a water passage port 10 is formed to allow water in the holding portion 9 and in the gap between the fixed core 16 and the movable core 8 to escape to the valve element 18 side. I have. Further, the fixed iron core 1 in the holding portion 9 is provided.
In the gap between the movable core 6 and the movable iron core 8 and in the water passage port 10,
Water always flows when the movable core 8 moves, so that there is no dead space.

Next, a groove 7 formed on the lower surface of the collar member 2
Will be described. The groove 7 is provided for the second purpose of the collar member 2, that is, for actively expelling bubbles around the collar member 2. As shown in FIG. 3B, the groove 7 is spirally formed on the lower surface of the collar member 2. The groove 7 exerts the following action when the solenoid valve 1 shown in FIG. 2 is open.

That is, when the solenoid valve 1 is changed from the closed state of FIG. 1 to the open state of FIG. 2, the output port 2 is separated from the input port 21 via the gap between the valve body 18 and the valve seat 17 which are separated.
Water flow to 2 is generated. Further, water existing in the holding portion 9 of the movable core 8 and in the gap between the fixed core 16 and the movable core 8 also flows to the output port 22 via the water passage port 10. At this time, the water flow is guided to the spiral groove 7 to be provided with a circumferential component, and the circumferential component induces a water flow around the entire periphery of the collar member 2. There is no place where stagnation occurs, so that even if bubbles exist, they are expelled to the output port 22 at an early stage.

The groove 7 may be formed on the inner peripheral surface instead of the lower surface of the collar member 2. As described above, the collar member 2 reduces the dead space in the solenoid valve 1 as much as possible to reduce bubbles accumulated when the valve is closed.
This has two purposes and effects of inducing a circumferential water flow to expel the bubbles to the output port 22 quickly when the valve is opened.

Next, an outline of the operation when the solenoid valve 1 provided with the collar member 2 having the above-described purpose and effect is used in a water jet type automatic loom will be described. The water jet type automatic loom is provided with a high-pressure pump 62 for applying high water pressure to the water of the water source 60 and forcing the water to the nozzles 61A and 61B as shown in FIG. 5, and the high-pressure pump 62 and the nozzles 61A and 61A.
B and the solenoid valves 63A and 63B. Here, as the solenoid valves 63A and 63B, the solenoid valve 1 of this embodiment is used.
Shall be used. As the high-pressure pump 62, a cam-driven plunger pump or the like is generally used. The nozzles 61A and 61B have water and a yarn roll 64 in addition to water.
Weaving yarns A and B for weft are supplied from A and 64B. When the electromagnetic valve 63A is opened and the high-pressure pump 62 is operated at the same time, high-pressure water is jetted from the nozzle 61A, whereby the thread A can be inserted. The same applies to the yarn B.

Now, consider a case in which the operation is stopped for the restoration work due to the breakage of the weft thread or the like, and the operation is resumed after the restoration. At this time, the solenoid valves 63A and 63B have been in a rest state for a while, but since the solenoid valve 1 of the present embodiment is used, the internal dead space is small, and the accumulation of bubbles is also very small. Since the expelling of air bubbles is rapid due to the effect of the spiral groove 7 of the collar member 2, the air bubbles are expelled by opening and closing the solenoid valves 63A and 63B and idling the high-pressure pump 62 about two or three times. Is completed.

When the bubbles are expelled, the water pressure generated by the high-pressure pump 62 is transmitted to the nozzles 61A and 61B without being reduced, so that the water injection from the nozzles 61A and 61B is stabilized. Therefore, the insertion of the thread A or the thread B can be started efficiently. A conventional water jet automatic loom that uses a solenoid valve required several tens of blank shots,
It can be understood that the efficiency of the woven fabric can be significantly improved by employing the solenoid valve 1.

As described above, the solenoid valve 1 of the present embodiment
, The return spring 3 is connected to the upper end of the movable core 8 and the fixed core 1.
6 and the collar member 2 having the spiral groove 7 is inserted at the position 4 surrounding the outer periphery of the lower end of the movable iron core 8 of the body 20. It is possible to minimize the amount of air bubbles accumulated therein, expel the air bubbles quickly, and significantly reduce the time required until the operation is stabilized when the opening / closing operation is started from the rest state.

As a result, it is possible to improve the operating efficiency of the water jet type automatic loom in which a large number of wefts are properly used, and it is possible to reduce water, electric power and the like required for blanking which do not directly contribute to production. In addition, it is possible to effectively use a means for accelerating the opening / closing operation of the electromagnetic valve itself represented by the remanence killer 26. Here, an elastic body is used as a material of the remanence killer 26,
Further, a twist may be added to this. In this case, since the remanence killer 26 also has a certain elastic expansion force, the elastic expansion force of the return spring 3 is assisted during the valve opening operation, and the valve opening operation is further accelerated.

The above embodiment is not intended to limit the present invention, and it is needless to say that various modifications and improvements can be made without departing from the gist of the present invention. For example, the vertical length of the collar member 2 may be shortened so that the lower surface of the collar member 2 is separated from the portion indicated by 25 in FIG. In the above embodiment, the collar member 2 is an independent part.
0 may be integrally formed. Alternatively, in the above-described embodiment, the collar member 2 is fixedly attached to the body 20 at a position surrounding the lower end outer periphery of the movable core 8, but instead, the collar member 2 is attached to the outer periphery of the lower end of the movable core 8 itself. The movable core 8 may be moved up and down together with the up and down movement. However, in that case, it is desirable to form a vertical groove for communicating vertically.

[0035]

As is apparent from the above description, the solenoid valve of the present invention has a characteristic collar member to reduce the dead space in the solenoid valve and to provide a circumferential water flow in such a portion. Is provided so that air bubbles are expelled at an early stage, thereby speeding up the stability of water injection after a downtime and providing a solenoid valve capable of greatly improving the productivity of a water jet type automatic loom. be able to.

Thus, in a water jet type automatic loom in which a large number of wefts are used properly, it is possible to reduce the necessity of idling at the start of operation and the like, and to improve the operation efficiency. Further, it is possible to reduce water consumption, electric power, and the like required for blank hitting that do not directly contribute to production, thereby reducing the unit consumption. Further, the life of the high-speed sliding portion in the solenoid valve or the high-pressure pump can be effectively utilized. Also, applied to the solenoid valve,
Various ideas for speeding up the opening / closing operation of the valve itself can be used only in conjunction with the present invention to achieve the original effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a 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 solenoid valve shown in FIG. 1;

FIG. 3 is a perspective view illustrating a collar member used in the solenoid valve shown in FIGS. 1 and 2.

FIG. 4 is a diagram illustrating a movable core used in the solenoid valve shown in FIGS. 1 and 2 and a structure of a movable core used in a conventional solenoid valve.

FIG. 5 is a view showing a schematic configuration of a water jet type automatic loom.

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

FIG. 7 is a cross-sectional view showing an open state of the solenoid valve shown in FIG. 6;

[Explanation of symbols]

 2 Collar member 3 Return spring 7 Groove 8 Moving iron core 11 Coil bobbin 13 Coil 16 Fixed iron core 17 Valve seat 18 Valve element 19 Guide sleeve 20 Body 21 Input port 22 Output port

Claims (1)

(57) [Scope of request for utility model registration] 1. A body in which an input port, an output port, and a valve seat are formed, a coil formed by winding a conductor around a cylindrical bobbin, and a cylindrical guide sleeve fixed together with a fixed iron core in the bobbin. Has a movable core slidably inserted in the guide sleeve, and a valve element fixed to the end of the movable core opposite to the side facing the fixed core, and energizes the coil to fix the movable core. An electromagnetic valve that separates a valve seat from a valve body by attracting to an iron core and connects an input port and an output port, wherein the direction in which the movable iron core is sandwiched between the movable iron core and the fixed iron core is separated from the fixed iron core. a return spring for biasing, there between the movable iron core and the body, the outer periphery is closed and the inner periphery without a gap in close contact with fitted interpolated collar member of the body, is formed in the collar member Circumference To induce a flow of direction
An electromagnetic valve having a groove .