JPH0212364Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flow rate regulating device for a solenoid valve that communicates an outflow path with the atmosphere.

Vending machines that sell liquid drinks, etc. must always have a fixed amount of fluid flowing out from the outflow path of the solenoid valve as necessary, and the amount of fluid flowing out must be adjustable and must not impair the quality of the fluid. be. 1st
The figure shows an example of a solenoid valve used for this purpose. In FIG. 1, the inlet passage 2 of the solenoid valve body 1
and the outflow channel 3 are arranged approximately at right angles, and the outflow channel 3 projects its inlet into the inflow channel 2. This inlet serves as a valve seat 4, and a diaphragm 5 covers this valve seat 4 to close off the outflow path 3. The diaphragm 5 has a central movable part formed concentrically sealing the valve seat 4, and a fixed part around the diaphragm 5 which is fixed between the main body 1 and the bonnet 6. The bonnet 6 is attached to the frame 8 of the electromagnetic coil 7 with the lid of the main body 1, and the diaphragm 5 is held between the main body 1 and the bonnet 6 by fixing the frame 8 to the main body 1. Electromagnetic coil 7
is inserted into a frame 8 bent into an inverted U shape, and a bonnet 6 is attached to the opening side of the frame 8. A movable core 9 is disposed inside the electromagnetic coil 7, and the lower end of the movable core 9 passes through the bonnet 6 and is connected to the movable portion of the diaphragm 5. 10
is a return compression spring attached to the diaphragm 5 and the inside of the bonnet 6. This electromagnetic valve flow rate adjustment device has a screw hole 1a in an outflow path 3 of a main body 1 whose axis intersects with the axis of the outflow path 3 and communicates with the atmosphere, and a screw thread 13 on the outer periphery of this screw hole 1a. A needle 12 is screwed in. Needle 1
2 is provided with a through hole 15 which is closed with a blind stopper 14 in the axial direction to communicate between the outflow path 3 and the atmosphere. The outflow path 3 may be provided with a pipe 17 to extend the outflow path 3.

Now, when the blind plug 14 is removed and a current is applied to the electromagnetic coil 7, the movable iron core 9 is attracted by the electromagnetic coil 7 and rises against the compression spring 10. Then iron core 9
The movable part of the diaphragm 5 connected to the valve seat 4 also rises, and the space between the valve seat 4 and the valve seat 4 opens. The solenoid valve is therefore opened and the fluid flows out from the outlet channel 3. The needle 12 is rotated in advance and moved forward and backward by the pitch of the thread 13 to adjust the length of the needle 12 projecting into the outflow path 3, thereby adjusting the amount of fluid flowing out of the electromagnetic valve. When the current to the electromagnetic coil 7 is cut off, the movable iron core 9 is released and lowered by the bias of the compression spring 10. Therefore, the diaphragm 5 also descends to close the valve seat 4. At this time, the through hole 1 of the needle 12
Air flows in from 5 and allows the fluid to fall freely.

However, since this needle is provided with a through hole that communicates with the atmosphere, dust and the like easily enter the valve through this hole, which poses a sanitary problem when the fluid is a beverage. Therefore, a blind plug is sometimes provided during storage of the solenoid valve, but in this case, there is a drawback that it is troublesome to attach and remove the blind plug. Furthermore, if the outflow path is accidentally blocked when the valve is open, there is a risk that the fluid will scatter to the outside through this through hole. There is the trouble of communicating with the atmosphere depending on the location.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks, provide a solenoid valve flow rate regulating device that is satisfactory in terms of food hygiene, can freely adjust the flow rate, and does not cause the fluid to scatter to the outside.

The purpose of this is to provide a threaded hole in the main body of the solenoid valve that communicates with the outflow path in the main body, screw a threaded needle into this threaded hole, and move the tip of the needle back and forth into the outflow path. In a device for adjusting the outflow flow rate of a solenoid valve, an air chamber is provided in the middle of the needle and passes through the needle in the diametrical direction, and the air chamber extends axially through the center of the needle from the air chamber to the distal end side of the needle. This is achieved by providing an air hole that communicates with the chamber and the outflow path, and an air groove that extends axially around the outer circumference of the needle from the air chamber toward the proximal end of the needle and communicates with the air chamber and the atmosphere.

Next, embodiments of the present invention will be described in detail based on the drawings. In FIG. 2, the solenoid valve has a fluid outflow path 3 with its inlet protruding into the inflow path 2 to form a valve seat 4, which is covered with a diaphragm 5, similar to conventional solenoid valves. The outflow route 3 is closed off. The diaphragm 5 is fixed to the main body 1 by a bonnet 6, and the electromagnetic coil 7 is inserted into a frame 8 bent into an inverted U shape, and its opening side is fixed to the main body 1 together with the bonnet 6, which is the lid of the electromagnetic valve main body 1. has been done. A movable iron core 9 is arranged inside the electromagnetic coil 7, and the lower end of the movable iron core 9 passes through the bonnet 6 and is connected to the diaphragm 5. 10 is a compression spring for return provided between the diaphragm 5 and the bonnet 6. The flow rate regulating device according to the present invention, like the conventional regulating device, is provided with a screw hole 1a in the outflow passage 3 of the main body 1, the axis of which intersects with the axis of the outflow passage 3, and which communicates with the atmosphere. It is almost the same as the conventional device in that a needle 12 having a thread 13 is screwed into the needle 12, but the flow rate regulating device according to the present invention has a head 19 on the needle 12, and the flow hole to the atmosphere is in the head 19. As shown in FIG. 3, an air chamber 20 is provided in the middle of the needle 12 and does not directly penetrate the needle in the axial direction.
The air chamber 20 extends in the axial direction from the center of the needle 12 to the distal end side of the needle 12, and the air chamber 20 is connected to the outflow path 3.
An air hole 21 is provided to communicate with the air chamber 20.
The outer periphery of the needle 12 extends in the axial direction from the base end side opposite to the above, that is, the head 19 side, and the air chamber 2
An air groove 22 is provided that communicates the 0 with the atmosphere (outside air). The needle 12 is further provided with a narrow body portion 23 which is adjacent to the groove 22 and has a smaller outer diameter than the portion where the thread 13 is provided. The groove 22 is bored to a depth such that it communicates with the air chamber 20. Insert such a needle 12 into the screw hole 1 of the main body 1.
a, a gap 24 is created between the narrow body part 23 and the main body 1, and the outflow passage 3 is connected between the air hole 21 and the air chamber 2.
0-Groove 22-Communicates with atmosphere through gap 24.
The flow rate adjustment of this electromagnetic valve is carried out by adjusting the amount by which the needle 12 is screwed into the screw hole 1a, thereby adjusting the amount by which the tip of the needle 12 protrudes into the outflow path 3, as in the conventional valve.

In a flow rate adjusting device having such a needle, the air flow path is curved, so that dust and the like do not easily enter the air flow path. Moreover, when the solenoid valve is not in use, by completely screwing the needle 12 into the screw hole 1a and closing the open end of the screw hole 1a on the outside air side with the head 19, the intrusion of dust etc. can be more completely prevented. can be prevented. Furthermore, if the outlet is blocked by mistake, the fluid will try to enter through the air hole, but the wall surface 2 of the air hole 20 shown in FIG.
It collides with 0a and temporarily accumulates in a relatively wide air chamber.
Furthermore, there is little leakage to the outside through grooves and gaps. When the outlet is opened, the liquid accumulated in the air chamber flows out of the outlet through the air hole again. In this flow rate adjustment device, in order to increase the flow rate, the fourth
As shown in the figure, when the needle 12 is rotated and moved backward, the air flow path becomes shorter, and the air resistance in this area is automatically reduced. Therefore, when a large amount of fluid is discharged, a large amount of air can also be sent.
On the other hand, when a small amount of fluid is to be discharged, the amount of air is limited to the required amount, and the flow path can be sandwiched to easily prevent dust from entering and fluid from flowing out. As shown in FIG. 5, the needle 12 is also provided with a thread 13' which is slightly thinner than the thread 13 in the narrow body part 23.
If the screw connection is made with a play that allows air to flow between the screw hole 1a and the screw hole 1a, the air flow path will be spiral-shaped.
Since it is longer, the infiltration of dust and the like is more completely prevented.

As described above, the electromagnetic valve flow control device according to the present invention provides an air chamber in the air flow passage, uses this air chamber as a fluid backflow prevention chamber, and bends the air flow passage with the grooves and gaps that follow. Because of this, there is less backflow of fluid and infiltration of dust, making it an excellent device for food hygiene and easy to handle.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional solenoid valve and its flow rate adjustment device, FIG. 2 is a cross-sectional view showing an example of a solenoid valve equipped with a flow rate adjustment device according to the present invention, and FIG. Examples of needles used in
A is a perspective view, B is a sectional view, FIG. 4 is an enlarged sectional view when the needle is fully opened in FIG. 2, and FIG. 5 is another embodiment of the needle, A is a perspective view, and B is a sectional view. It is. 1: Solenoid valve body, 1a: Screw hole, 3: Valve outflow path, 12: Needle, 15: Needle through hole,
20: Needle air chamber, 21: Air hole, 22:
Groove on the outer periphery of the needle, 24: Gap between the needle and the main body.

Claims (1)

[Scope of utility model registration request] A threaded hole is provided in the main body of the solenoid valve and communicates with the outflow path in the main body, and a threaded needle is screwed into this threaded hole and its tip is moved forward and backward into the outflow path to control the outflow of the solenoid valve. In the device that adjusts the flow rate, an air chamber is provided in the middle of the needle, passing through the needle in the diametrical direction, and further extending from the air chamber to the distal end side of the needle in the center of the needle in the axial direction, and connecting the air chamber and the outflow. Flow rate of an electromagnetic valve characterized by having an air hole communicating with the air passage, and an air groove extending axially around the outer periphery of the needle from the air chamber to the proximal end side of the needle and communicating with the air chamber and the atmosphere. Regulator.