JPS5931334Y2 - Nozzle for high viscosity fluid - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high viscosity fluid nozzle for discharging a high viscosity fluid such as an adhesive, and particularly to a nozzle for discharging the high viscosity fluid at the end of discharging.

2. Description of the Related Art Conventionally, there is a nozzle for discharging a high viscosity fluid such as an adhesive as shown in FIG.

Based on this, the conventional nozzle can be explained as follows:
A spool 4 having a valve portion 3 for opening and closing the discharge port 1 is mounted in the nozzle body 2 in which a spool 4 is slidable in the axial direction.

A coil spring 9 is inserted into the nozzle body 2 and has one end in contact with a cap 7 having a female thread 6 that is screwed into a male thread 5 formed on the outer peripheral surface of the nozzle body 2, and the other end in contact with a radial surface 8 of the spool 4. The coil spring 9 applies an elastic force to the spool 4 in a direction that causes the valve portion 3 to close the discharge port 1 .

Note that 10 is a lock nut for fixing the cap, and 11 is an O-ring.

A hose 1 is attached to a pipe portion 12 protruding from the rear end of the spool 4.
3 is connected, and the tip of the spool 4 and the nozzle body 2
A guide hole 1 is provided in the spool 4 in order to send the high viscosity fluid supplied from the hose to the fluid passage 14 formed between the spool 4 and the spool 4.
5 is formed.

Therefore, the adhesive sent out from the adhesive dispensing quantitative gun (not shown) passes through the hose 13 and the guide hole 15.
The fluid reaches the fluid passage 14, and the pressure of this fluid causes the spool 4 to move backward to the right in FIG. 1 against the elastic force of the coil spring 9.

Then, the valve portion 3 opens the discharge port 1, and the adhesive is discharged from the discharge port 1.

Next, when a certain amount of adhesive is discharged, the pressure of the adhesive decreases, and the discharge port 1 is closed by the valve portion 3 due to the elastic force of the coil spring 9, and the discharge of the adhesive is completed.

In such conventional nozzles, even if the metering gun for discharging adhesive stops discharging adhesive, the discharge port 1 of the nozzle does not close in response, resulting in a stringy phenomenon of adhesive. There was a problem with it happening.

The reason for this is that the nozzle and the metering gun are connected by the flexible hose 13, so the flexible hose 13 expands due to the pressure while the adhesive sent from the metering gun at a predetermined pressure is discharged from the discharge port. Even when the metering gun stops and the valve part 3 begins to close the discharge port 1, the flexible hose 13 itself contracts to its original state, and the residual pressure at the time of contraction prevents the discharge port 1 from being completely closed, resulting in adhesion. This caused the agent to become stringy.

The present invention was developed by focusing on the problems of the conventional technology, and it prevents the influence of the residual pressure that acts on the high viscosity fluid inside the hose when the hose contracts, and reduces the amount of high viscosity fluid at the end of discharge. The purpose of this is to prevent the stringing phenomenon of high viscosity fluids such as adhesives by improving the cutting ability of the adhesive.

Next, a description will be given based on FIG. 2 showing a case in which the present invention is embodied in a nozzle for discharging adhesive.

FIG. 2 (Among the members shown here, those indicated by numbers with the symbol a correspond to the members with the same numbers as shown in FIG. 1a
A spool 4a having a valve portion 3a at its tip for opening and closing is attached so as to be freely slidable in the axial direction.

A coil spring 9a is provided in the nozzle body 2a, one end of which abuts on a cap 7a having a female thread 6a that is screwed into a male thread 5a formed on the outer peripheral surface of the nozzle body 2a, and the other end abuts against a radial surface 8a of the spool 4a. This coil spring 9
The spool 4a is connected to the discharge port 1a by the valve part 3a.
An elastic force is applied in the direction of closing.

A tube portion 12a whose rear end protrudes from the nozzle body 2a is provided on the spool 4a, and a hose 13a is connected to the rear end of this tube portion 12a.

The hose 13 passes through a high viscosity fluid reservoir 14a formed between the tip of the spool 4a and the nozzle body 2a and then flows to the discharge port 1a.
A guide hole 15a is formed in the spool 4a to send the adhesive supplied from the spool 4a.

A tapered valve seat 16 is formed at the tip of the pipe portion 12a, and a check ball 17 is housed in the guide hole 15a in order to abut against the valve seat 16 and prevent backflow of adhesive.

Note that the valve seat 16 and check ball 17 constitute a check valve.

An air supply pipe 1B that supplies air to the fluid reservoir 14a for discharging the adhesive present in the fluid reservoir 14a from the discharge port 1a is attached to the nozzle body 2a/l, and the air supply pipe 1B is connected to the nozzle body 2a/l. In order to prevent backflow of the adhesive, a check ball 20 is housed in the air supply pipe 1B and comes into contact with a tapered valve seat 19 formed in the air supply pipe 1B.

Note that the valve seat 19 and the check ball 20 constitute a check valve.

The adhesive sent out from the metering gun reaches the fluid reservoir 14a through the hose 13a and the guide hole 15a, and the pressure of the adhesive moves the spool 4a backward to the right side in FIG. 2 against the elastic force of the coil spring 9a. let

Then, the valve portion 3a opens the discharge port 1a, and the adhesive is discharged from the discharge port 1a.

Next, when the dispensing of a certain amount of adhesive is finished, the metering gun stops, and when the valve portion 3a starts to close the discharge port 1a due to the elastic force of the coil spring 9a, a signal for discharging adhesive from the metering gun is sent. As a result, when air is blown from the air supply pipe 18, the spool 4a moves backward again, and at the same time, the fluid reservoir 14a (
Air from the air supply pipe 1B (thus, the adhesive is discharged from the discharge port 1a, and the adhesive in the fluid reservoir 14a is emptied).

When the supply of air is stopped when the adhesive inside is empty, the discharge port 1a is closed by the elastic force of the coil spring 9a.

As the hose 13a contracts, the adhesive sent out by pushing the check ball 17 after the metering gun is stopped gradually flows into the fluid reservoir 14a and is collected therein, so that it does not flow out from the discharge port 1a.

In this way, the contraction of the hose 13a causes the hose 13a to
The volume of the fluid reservoir 14a is equal to that of the hose 13 because the adhesive pushed inside was strained so as to be contained in the fluid reservoir 14a.
Adjust according to the length of a.

As described above, according to the present invention, air l from the air supply pipe is
As a result, the high viscosity fluid occupying the fluid pool can be removed, and after the metering gun for discharging high viscosity fluid is stopped by contraction of the hose, the high viscosity fluid is collected in the high viscosity fluid pool pushed through the hose and remains there. No stringy phenomenon occurs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a conventional nozzle, and FIG. 2 is a sectional view showing the structure of the nozzle of the present invention. 1a...Discharge port, 2a...Nozzle body, 3a...Valve section, 4a...Spool
9a... Coil spring, 12a... Pipe section, 13a... Hose, 14a... Fluid reservoir, 15a... Guide hole, 18 ...Air supply pipe.

Claims (1)

[Scope of utility model registration request] A spool having a valve portion that opens and closes a discharge port formed in the nozzle body is installed in the nozzle body so as to be slidable in the axial direction, and a spring is provided to apply elastic force to the spool in the direction of closing the discharge port. A nozzle in which the spool has a guide hole provided in the nozzle body to send a high viscosity fluid from a hose connected to a pipe portion at the rear end of the spool to a fluid reservoir formed between the spool and the nozzle body. An air supply pipe for supplying air to the fluid reservoir so as to discharge the high viscosity fluid occupying the fluid reservoir is attached to the nozzle body, and a check valve is provided in the pipeline to prevent backflow from the fluid reservoir. A nozzle for high viscosity fluid, characterized in that a check valve for preventing backflow from the fluid reservoir is provided in the guide hole.