JPH06221462A - Spray solenoid valve - Google Patents

Abstract

PURPOSE:To provide a spray solenoid valve which can supply a paint to a spray nozzle at frequency higher than specified number of times per minute. CONSTITUTION:A spray solenoid valve has a coil 10 having a conductor wound on a hollow coil bobbin 16, a fixed iron core 17 which is inserted into the one end of a coil bobbin hole and fixed, a movable iron core which is attracted to the fixed iron core 17 by turning on the coil 10 slidably attached to the other end of the coil bobbin, a ball valve body 3 fixed at the tip opposite to the fixed iron core 17 of the movable iron core 2, a valve seat 4 which is abutted on the ball valve body 3 or separated front it by the movement of the movable iron core 2, and a spray nozzle 1 fixed near the valve seat 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray solenoid valve that supplies paint to a paint spray nozzle used in a coating facility such as an automobile manufacturing process, and more specifically, to the spray nozzle about 2400 times per minute. The present invention relates to a high frequency spray solenoid valve that supplies paint at a high cycle.

[0002]

2. Description of the Related Art In recent years, for the purpose of obtaining a uniform coated surface, paint has been sprayed continuously by a paint spraying nozzle, and the original pressure of the paint (liquid) has been controlled for the shade of color. ing. This is because the supply amount of the paint can be arbitrarily controlled by supplying the paint in a pulse shape to the spray nozzle. Further, by supplying the coating material in a pulse shape to the spray nozzle, the particle size and the diffusion rate of the coating material generated from the spray nozzle can be made uniform. Accordingly, when the coating object is overlapped with the normal spray nozzle to form the coating surface, the flow rate of the coating material can be easily controlled to be constant, so that a uniform coating surface can be finished.

As a concrete means for spraying the paint in a pulsed form, a commercially available solenoid valve which is separate from the spraying nozzle is used, and the paint is pulsed in a high cycle of about 1000 times per minute. It is possible to supply to. Then, a spray device for supplying paint, in which this solenoid valve is connected to a spray nozzle by a pipe or the like, can be considered. On the other hand, in order to control the supply amount of the paint more accurately, it has been desired to spray in a pulsed form with a high cycle of 2400 times or more per minute.

[0004]

However, this spray device has the following problems. (1) In a solenoid valve that controls the supply of paint at a high cycle, a commercially available solenoid valve is used, so the distance from the contact portion between the valve seat and the valve body that actually turns on and off the flow rate to the spray nozzle is long, In the meantime, paint accumulates. Therefore, when the solenoid valve is opened, the stored paint is not sprayed until the pressure is applied, resulting in a loss of time, which is not suitable for spraying in a high cycle. Although the spraying of the paint is started before the pressure becomes constant, the amount of the sprayed paint is non-uniform and the dispersion distribution of the sprayed paint changes before the pressure becomes constant. There is a problem of impairing the uniformity of the painted surface.

(2) In order to solve the above problems, the inventor of the present invention considered to integrally configure the spray nozzle and the solenoid valve. However, when the solenoid valve is turned on and off at a high cycle of 2400 times per minute or more, the clearance between the movable core and the fixed core needs to be set small and delicate. It is necessary to shorten the distance between the movable iron core and the fixed iron core.
On the other hand, if the separation distance is too short, the separation distance between the valve body and the valve seat is short, and there is a problem that the required amount of paint does not flow. Since the position of the valve seat with respect to the fixed iron core is fixed in the conventional solenoid valve, it has been difficult to repeat the contact and separation of the valve body and the valve seat with a high cycle. Here, if the machining accuracy of the valve seat, spherical valve body, movable iron core, fixed iron core, etc. is precisely controlled, it is possible to realize the optimum positional relationship between the valve seat and the fixed iron core. It is not realistic because it leads to a significant cost increase.

The present invention provides 24 per minute for spray nozzles.
It is an object of the present invention to provide a spray solenoid valve capable of supplying paint at a high cycle of 00 times or more.

[0007]

To achieve this object, a spray solenoid valve according to the present invention comprises a coil formed by winding a wire around a hollow coil bobbin, and a fixed iron core inserted and fixed at one end of a coil bobbin hole. A movable iron core that is slidably attached to the other end of the coil bobbin and is attracted to the fixed iron core by energizing the coil, and a spherical valve element fixed to the tip of the movable iron core opposite to the fixed iron core. It has a valve seat that comes into contact with or separates from the spherical valve body by the movement of the movable iron core, and a nozzle fixed near the valve seat.

In order to achieve this object, the spray solenoid valve of the present invention has a coil in which a wire is wound around a hollow coil bobbin, a fixed iron core inserted and fixed in one end of a coil bobbin hole, and a coil bobbin. The movable iron core is slidably attached to the other end and is attracted to the fixed iron core by energizing the coil, the spherical valve element fixed to the tip of the movable iron core opposite to the fixed iron core, and the movement of the movable iron core. It has a valve seat that is in contact with or separated from the spherical valve body, and a nozzle that is fixed in the vicinity of the valve seat, and has a hollow cylindrical shape that fixes the valve seat inside and sets the position of the valve seat relative to the fixed iron core. And valve seat position fine adjustment means for changing the valve seat position.

[0009]

The coil of the spray solenoid valve of the present invention having the above-mentioned structure is energized to generate a magnetic field and attract the movable iron core to the fixed iron core. Here, energization is 240 minutes per minute.
Since it is performed at a high cycle of 0 times or more, the movable iron core follows the contact with the fixed iron core and repeats the separation at a high cycle of 2400 times or more per minute. In addition, the spherical valve element fixed to the end of the movable iron core is contacted with and separated from the valve seat by 24 per minute.
Repeat with a high cycle of 00 times or more. Here, since the spherical valve body and the valve seat are made of cemented carbide, they are not deformed or damaged even with repeated strong impact and repeated collision.

Further, the nozzle fixed near the valve seat is
The paint is sprayed from a nozzle outlet having a small area while applying a rotational force to the paint, so that the paint is uniformly dispersed in fine particles. At this time, the paint supplied to the nozzle is 2400 per minute.
Since it is supplied in a pulsed manner at a high cycle of at least one time, the uniformity of the particles of the paint is improved and the uniformity of the diffusion distribution of the particles is improved. Also, since there is a nozzle near the valve seat, a small amount of paint is stored between the valve seat and the nozzle,
Even when the valve is repeatedly opened and closed at a high cycle of 2400 times per minute or more, the uniformity of the paint particles and the uniformity of the diffusion distribution can be maintained at the time of opening, so that a uniform coated surface can be obtained. .

Further, the positional relationship between the valve seat and the fixed iron core can be finely adjusted by the valve seat position adjusting means. In order to contact and separate the valve seat of the spherical valve body 2400 times or more per minute, it is necessary to shorten the moving distance between the movable iron core and the fixed iron core. However, if they are too close to each other, the gap formed between the spherical valve body and the valve seat becomes too narrow, and the required amount of paint cannot flow, so it is necessary to make fine adjustment at a level of 0.01 mm between them. Further, when the valve seat is moved to change the positional relationship between the valve seat and the fixed iron core, it is necessary to move the valve seat parallel to the spherical valve body. Can be moved in parallel to the spherical valve body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spray solenoid valve which is one embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the structure of the spray solenoid valve. A coil 10 in which a conductor is wound around the outer circumference of a hollow coil bobbin 16.
A core 11 made of a conductive material is arranged so as to surround the. A fixed iron core 17 is fixed to the right end of the hollow hole of the coil bobbin 16. At the center of the fixed iron core 17,
A fixed iron core passage 17a through which the paint F passes is bored. An inner threaded joint portion 21 is formed on the upstream side of the fixed core.

On the outer side of the core 11, the outer frame 1 of the valve body is provided.
2, the valve body outer frame 12, the core 11, the fixed iron core 17, and the coil 10 are integrally molded with resin to form an electromagnetic valve portion. Here, the reason why the entire solenoid valve portion is integrally molded with resin is to prevent the paint from catching fire due to sparks that may occur when electricity is applied to the coil. The movable iron core 2 is slidably fitted into the left end of the hollow hole of the coil bobbin 16. The return spring hole 2 is provided on the fixed iron core 17 side of the movable iron core 2.
a is provided, and a movable iron core passage 2b is provided so as to communicate with the return spring hole 2a. A return spring 15 is attached to the return spring hole 2a. The right end of the return spring 15 is in contact with the left end surface of the fixed iron core 17, and the return spring 15 urges the movable iron core 2 to the left.

A sliding guide 9 is fixed to the left end of the valve body outer frame 12. At the left end of the sliding guide 9, a valve seat outer frame 8 having a threaded portion formed inside is fixedly installed. The shape of the movable iron core 2 is shown in FIG. As shown in the figure, the movable core 2 has a three-step structure on the outside, and a recess is formed at the left end. A spherical valve body 3 made of cemented carbide, which is obtained by appropriately mixing metal carbide powder and metal powder and sintering the same, is brazed to the recess.

The valve seat holder 6 is attached in a state of being screwed into the threaded portion inside the valve seat outer frame 8. The detailed structure of the valve seat holder 6 is shown in FIG. As shown in FIG. 4, a valve seat 4 made of a cemented carbide obtained by appropriately mixing metal carbide powder and metal powder and sintering the slanted outer peripheral portion has a slanted inner circumference of the valve seat holder 6. Is fitted to the part. Spherical valve body 3 of valve seat 4
The spherical valve body 3 and the valve seat 4 can be accurately brought into line contact with each other in a circular shape even if there is a slight variation in accuracy.

On the outside of the valve seat holder 6, a position adjusting screw portion 6b screwed into an inside screw portion of the valve seat outer frame 8,
A fixing screw portion 6a for fixing the valve seat holding body 6 to the valve seat outer frame 8 and an O-ring holding portion are formed. Here, the adjusting screw portion 6b is a screw having a fine pitch so that it can be finely adjusted. A rubber O-ring is attached to the O-ring holder. A fixing nut 7 is screwed into the fixing screw portion 6a.

A spherical valve disc guide 14 is fixed to the inner periphery of the valve seat holder 6. On the inner circumference of the spherical valve body guide 14, a slender step portion 2c in which the spherical valve body 3 is brazed to the tip of the movable iron core 2 is slidably fitted. Here, a chamfered portion 2d through which the paint F passes is formed on one side surface of the narrow step portion 2c. The spray nozzle 1 is attached to the left side of the valve seat holder 6. A paint guide (not shown) is formed inside the spray nozzle 1, and the paint F is rotated by the paint guide and atomized into a spray from a nozzle hole formed at the tip. Here, the spray nozzle 1 is generally purchased as a component and is regularly replaced because a failure such as paint clogging is likely to occur. A spray guide 5 is attached to the outlet side of the spray nozzle 1.

Next, the operation of the spray solenoid valve having the above construction will be described. The paint F, which is controlled to a constant pressure from a paint tank (not shown), is supplied from the joint 21 to the spray solenoid valve. The supplied paint F passes through the fixed iron core passage 17a, the return spring hole 2a, the movable iron core passage 2b, and the chamfered portion 2d, and is supplied to a point where the valve seat 4 and the spherical valve body 3 are in contact with each other. There is. The spherical valve body is in contact with the valve body 4 by the return spring 15 when the coil 10 is not energized, so that the paint F is not supplied to the spray nozzle 1.

Next, the case where the coil 10 is energized at a high cycle of 2400 times or more per minute will be described. When the coil 10 is energized, the movable core 2 is attracted to the fixed core 17 magnetized by the generated magnetic field, and the spherical valve body 3 separates from the valve seat 4. When the movable iron core 2 is de-energized, the return spring 15 urges the movable iron core 2 toward the valve seat 4, so that the spherical valve body 3 comes into contact with the valve seat 4 again. The contact F and the separation are repeated at every energization, whereby the paint F is sprayed from the spray nozzle 1 at a high cycle of 2400 times or more per minute.

Next, the adjustment of the positional relationship between the valve seat 4 and the fixed iron core 17 will be described. It is necessary to finely adjust the positional relationship between the valve seat 4 and the fixed iron core 17 at 240 rpm.
In order to move the movable iron core 2 with respect to the fixed iron core 17 in a high cycle as a solenoid valve of 0 times or more, it is necessary to set the moving distance of the movable iron core 2 short, but set the moving distance too short. Then, there is a problem in that the gap formed between the spherical valve body 3 and the valve seat 4 is too narrow and a required amount of paint does not flow. Here, it is necessary to finely adjust the moving distance between the movable iron core 2 and the fixed iron core 17 at a level of 0.01 mm after assembling according to the performance of the coil 10 and the manufacturing accuracy of the spherical valve body 3, the valve seat 4 and the like. .

The spray guide 5 and the spray nozzle 1 are easy to remove, and by removing the spray guide 5 and the spray nozzle 1 and loosening the fixing screw 7, the position of the valve seat holder 6 can be adjusted with respect to the fixed iron core 17. Becomes That is, a hexagon wrench is attached to the hexagonal hole formed in the hole portion of the valve seat holder 6 to rotate the valve body holder 6. Thereby, the valve seat holder 6 can be adjusted by a small amount by screwing or loosening the position adjusting screw portion 6b. After adjustment, the fixing screw 7 is tightened and brought into contact with the valve seat outer frame 8, so that the valve seat holding body 6 can be fixed to the fixed iron core 17.

Since the position of the valve seat 4 with respect to the fixed iron core 17 can be finely adjusted, the moving distance between the movable iron core 2 and the fixed iron core 17 can be finely adjusted, and the movable iron core 2 can be operated in a high cycle. . At this time, the spherical valve body 3 and the valve seat 4
When the separation distance of is changed, the spherical valve body 3 and the valve seat 4 become 1
The amount of paint F supplied to the spray nozzle 1 normally changes when the spray nozzles 1 are separated, but the amount of paint sprayed from the spray nozzle 1 has a limit depending on the size of the nozzle. The distance between the spherical valve body 3 and the valve seat 4 may be finely adjusted so that the minimum amount of paint required for supply can be supplied. By doing so, it is possible to obtain a pulsed spray having a high cycle while keeping the amount of the sprayed paint constant.

According to the spray solenoid valve of the above-mentioned embodiment, the spherical valve body fixed to the tip of the movable iron core, the valve seat which is brought into contact with or separated from the spherical valve body by the movement of the movable iron core, and the vicinity of the valve seat. Since it has a nozzle fixed to
When the contact and separation of the valve seat and the spherical valve body are repeated at a high cycle of 00 times or more, even if the spray amount per time is small, the amount of paint accumulated between the valve seat and the spherical valve body Since the amount is small, a constant amount of paint can be sprayed quickly and stably every time. Further, since the supply pressure of the paint does not change when sprayed by the spray nozzle, the particle size of the sprayed paint and the distribution of the spray of the paint are constant, and a uniform coated surface can be obtained.

Further, the spray solenoid valve of the present embodiment is a hollow cylinder and has a valve seat holding member which is a valve seat position fine adjusting means for fixing the valve seat inside and changing the position of the valve seat with respect to the fixed iron core. Since the movable iron core 2 and the fixed iron core 17 can be finely adjusted, the movable iron core 2 can be reciprocated at a high cycle, and the spherical valve element 3 and the valve seat 4 can be moved at a high cycle. Can be abutted and separated.

The spray solenoid valve which is one embodiment of the present invention has been described above, but various modifications can be made within the scope of the present invention. For example, the movable iron core 2 and the fixed iron core 17
A non-magnetic ring or the like may be mounted between and to block magnetic contact between the movable iron core 2 and the fixed iron core 17 at all times.

[0026]

As is apparent from the above description, according to the spray solenoid valve of the present invention, the spherical valve body fixed to the tip of the movable core and the spherical valve body abutting or contacted by the movement of the movable core. Since it has a valve seat that is separated and a nozzle that is fixed in the vicinity of the valve seat, the amount of paint that is stored between the valve seat and the spherical valve body is small. Can be sprayed quickly and stably. Further, since the supply pressure of the paint does not change when sprayed by the spray nozzle, the particle size of the sprayed paint and the distribution of the spray of the paint are constant, and a uniform coated surface can be obtained.

Further, the spray solenoid valve of the present invention includes a valve seat holder, which is a hollow cylinder, which fixes the valve seat therein and changes the position of the valve seat with respect to the fixed iron core, which is a valve seat position fine-adjusting means. Since it has, it is possible to finely adjust the separation distance between the movable iron core and the fixed iron core, so that the movable iron core can be reciprocated in a high cycle, and the spherical valve body and the valve seat can be brought into contact with and separated from each other in a high cycle. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a spray solenoid valve that is an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a valve seat holder.

FIG. 3 is a cross-sectional view showing a configuration of a movable core that holds a spherical valve body.

FIG. 4 is a view showing a shape of a valve seat.

[Explanation of symbols]

 1 Spray Nozzle 2 Movable Iron Core 3 Spherical Valve Body 4 Valve Seat 6 Valve Seat Holder 10 Coil 17 Fixed Iron Core

Front page continuation (72) Inventor Masakazu Ito 5-10-18 Higashigotanda, Shinagawa-ku, Tokyo Within Spraying Systems Japan Co., Ltd. Address Address

Claims (2)

[Claims] 1. A coil in which a conductor is wound around a hollow coil bobbin, a fixed iron core inserted and fixed at one end of the coil bobbin hole, and slidably attached to the other end of the coil bobbin to energize the coil. A movable iron core that is attracted to the fixed iron core by being contacted, a spherical valve body fixed to the tip of the movable iron core on the side opposite to the fixed iron core, and abutting against the spherical valve body by the movement of the movable iron core or A spray solenoid valve having a valve seat that is spaced apart and a nozzle that is fixed near the valve seat. 2. The spray solenoid valve according to claim 1, wherein the valve seat position fine-adjusting means has a hollow cylindrical shape and fixes the valve seat therein and changes the position of the valve seat with respect to the fixed iron core. And a spray solenoid valve.