JPH0319372Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a nozzle device for spraying a fixed amount of an atomized fluid such as a vaccine in an atomized state.

[Background of the idea]

Various vaccines are used to prevent infectious diseases in various animals. Vaccines are administered by various methods depending on the infection mode of the pathogen, and some vaccines are administered by spraying a liquid vaccine into the animal's nasal cavity. In this type of vaccine administration work, it is desirable to always administer a fixed amount of vaccine in succession.

[Conventional technology]

Although it is possible to spray administer a fixed amount of vaccine, it is impossible to continuously and accurately spray administer a fixed amount using conventional common nozzles. Under these circumstances, a nozzle device that can continuously supply a fixed amount is desired.

Therefore, the applicant for utility model registration
No. 133084 (Utility Model Publication No. 61-48720) aims to provide a spray nozzle device that can continuously supply a fixed amount of liquid such as a vaccine. We have already developed a fixed-quantity supply nozzle device in which the liquid is moved by pressure fluid in response to a trigger operation, the liquid is measured inside the movement space, and only the measured liquid is supplied under pressure as atomized state at the time of injection. is suggesting.

However, in this quantitative supply nozzle device, sliding contact portions are provided between the first piston and the circumferential wall of the piston chamber, and between the second piston and the circumferential wall of the metering chamber, via piston rings.
There has been a problem in that the sliding resistance increases, and as a result, the sliding speed of the first piston and the second piston, which is integral with the first piston, becomes slow. Further, the pressure of the pressurized fluid acts on the front end surface of the first piston, while the pressure of the sprayed fluid acts on the rear end surface of the second piston, and the pressure receiving area of the first piston, Since there is a difference between the pressure-receiving area of the second piston and the pressure-receiving area of the second piston, in order to generate a predetermined injection pressure, the difference in the pressure-receiving area must be taken into account and calculated from the supply pressure. Therefore, when adjusting and changing the injection pressure, it is necessary to calculate the supply pressure each time taking into account the difference in the pressure receiving area, which makes it difficult to adjust the injection pressure. It was hot.

[Purpose of invention]

The object of the present invention was made in view of the above-mentioned problems, and is to provide a constant-quantity supply nozzle device that enables quick piston movement and easy adjustment of injection pressure.

[Summary of the idea]

Therefore, in the quantitative supply nozzle device of the present invention, the portion that was used as the first piston in the previous application is simply a spring receiver, and integrally with this, the pressure fluid is applied directly to the piston in the metering chamber.

As a result, the sliding contact portion between the piston and the integral part is reduced, and as a result, the moving speed of the piston can be increased. In addition, the pressure receiving area of the spring receiver and piston that receives pressure from the pressure fluid is set to be approximately equal to the pressurizing area of the piston that pressurizes the spray fluid, and the supply pressure of the pressure fluid is approximately equal to the pressurizing force of the spray fluid. Since they are equal, the injection pressure can be easily adjusted.

〔Example〕

First, FIG. 1 shows the overall configuration of a quantitative supply nozzle device 1 of the present invention.

This metered supply nozzle device 1 has a spray part 3 detachably attached to the tip side of the device body 2, and a spray part 3 detachably attached to the rear end portion of the device body 2 by a detachable nut 4. It is equipped with a measuring chamber 5. The device main body 2 has a connection port 7 at its lower end for introducing pressure fluid 6, and is also provided with a trigger 8 that is swingable around a support shaft 9.

Next, FIG. 2 shows the inside of the device main body 2,
The structure of the spray section 3 and the metering chamber 5 as the main parts of the present invention is shown.

The device main body 2 has a passage 10 leading to the connection port 7.
A ball valve 11 and a valve seat 12, which are biased by a spring 11a, are assembled with a fixing nut 13 in the middle portion of this passage 10. The valve seat 12 and fixing nut 13 slidably hold a trigger rod 14 driven by the trigger 8 at the center.

In addition, a piston chamber 15 is provided at the rear end portion of the device main body 2.
is integrally formed, and a cap 16 is screwed into this opening surface. This cap 16 is provided with a passage 16a through which the pressure fluid 6 passes in the axial direction. The pressure fluid 6 passes through this passage 16a and comes into contact with a front end surface 23a of a piston 23, which will be described later, and is pressurized. Further, inside the piston chamber 15, a spring receiver 18 biased by a spring 17, and a pipe 20 fixed by this and reaching the spray section 3 inside the supply path 19 are slidably inserted. has been done. The spring 17 is connected to the front end 18a of the spring receiver 18 and the front end surface 16 of the cap 16.
b, and between the outer peripheral surface of the front end 18a of the spring receiver 18 and the inner peripheral wall of the piston chamber 15, the pressure fluid 6 sent through the passage 10 is connected to the cap 16. A gap 26 is provided so that it can be guided to the passage 16a side. The passage of the pipe 20 constitutes a fluid passage 21 that guides the spray fluid 45 to the spray section 3. Further, a housing 22 is detachably attached to the rear end side of the cap 16. Inside this housing 22,
A piston 23 is slidably inserted, and this piston 23 is removably screwed and fixed to the spring receiver 18. This piston 23, spring receiver 18, etc. constitute a sliding member. Note that a piston ring 23c for airtightness is fitted into the circumferential surface of the piston 23.

Further, the space between the piston 23 and the rear end wall 22a of the housing 22 forms a measuring chamber 24 of about 1 [cc]. This metering chamber 24 communicates with the fluid passage 21 via a passage hole 25 provided on the rear end side of the piston 23 .

By the way, as shown in FIG. 3, the pressure receiving area (S1+S2) obtained by adding the pressure receiving area S1 of the intermediate portion 18b of the spring receiver 18 to the pressure receiving area S2 of the front end surface 23a of the piston 23 is the pressure receiving area (S1+S2) of the rear end surface 23b of the piston 23. It is set to be approximately equal to the pressurizing area S3. Therefore, the pressure of the pressure fluid 6 applied to this pressure receiving area (S1+S2) is equal to the pressure of the spray fluid 45 introduced into the metering chamber 24 at the start of spraying.
It is almost equal to the pressurizing pressure (supply pressure).

Further, the center portion of the rear end wall 22a is penetrated, and a check valve 33 is attached to close the through hole 22b. That is, this check valve 33 has a plurality of holes 33a on the side closer to the outer periphery, and the outer periphery is connected to the annular member 27.
It is supported by pressure. When the inside of the measuring chamber 24 is pressurized, the through hole 22b
The check valve 33 is in close contact with the rear end wall 22a so as to close the rear end wall 22a. However, when the inside of the metering chamber 24 is in a negative pressure state, the check valve 33 has its central portion close to the rear end wall 22a. Further apart, the inflow channel 32 and the through hole 22
A certain amount of spray fluid 45 from b flows into the hole 3 of the check valve 33.
The metering chamber 24 is replenished through 3a.

A fitting 29 is incorporated into the rear end of the housing 22 via a holder 28 with a detachable nut 4, and a spray fluid 45 is installed in this fitting 29.
containers 30 are connected via a joint member 31. The inside of the container 30 is under atmospheric pressure and can be replaced with air, and communicates with a check valve 33 via an inflow path 32.

A spray section 3 is provided at the tip of the main body 2 of the device. This spraying section 3 is constructed by a nozzle head 34 screwed and fixed to the tip of the device main body 2, a sleeve 35 screwed and fixed to the nozzle head 34, a nozzle 36 interposed and held between these, and a valve spring 37 at the rear. The main component is a slidable nozzle valve body 38 whose end face is urged against the tip face of the pipe 20. The spout 39 of the nozzle head 34 faces the tip of the nozzle 36, and the rod 38a at the tip of the nozzle valve body 38 is inserted into the nozzle hole 40 of the nozzle 36. A nozzle valve hole member 41 is fitted into the inlet portion. And this nozzle valve hole member 41
and the nozzle valve body 38 constitute a nozzle valve 44. One end of the valve spring 37 is locked to the rear end surface of the nozzle 36, and the other end is locked to the base flange-like surface of the nozzle valve body 38 in a compressed state.
The nozzle valve body 38 is configured to move in conjunction with the sliding movement of the spring receiver 18 and the piston 23, that is, the sliding movement of the pipe 20.

A fluid guide hole 42 is formed at the tip of the pipe 20, and the fluid passage 21 passes through the fluid guide hole 42, and then through a nozzle valve 44 to the nozzle hole 40.
It is familiar to On the other hand, the passage 10 of the pressure fluid 6 is
The nozzle head 34 communicates with the spout 39 through a through hole 43 provided in the peripheral wall thereof.

Next, the operation of the quantitative supply nozzle device 1 will be explained.

The user pulls the trigger 8 and the trigger rod 14
When the ball valve 11 is separated from the valve seat 12 by
Pressure fluid 6 passes through passage 10 and enters piston chamber 15.
into the interior of the piston 23 through the passage 16a.
It flows into the front end surface 23a side. As a result, the spring receiver 18, the piston 23 and the pipe 20
is pressurized by the pressure of the pressure fluid 6 and retreats. The interior of the metering chamber 24 is pressurized by this sliding movement of the piston 23 toward the retreating side. At this time, measuring chamber 2
The atomizing fluid 45 in 4 is pressurized under a pressure value approximately equal to the pressure of pressure fluid 6. The spray fluid 45 that has been led into the metering chamber 24 flows into the fluid passage 21 through the passage hole 25, and further reaches the nozzle valve 44 through the fluid guide hole 42. Following the backward movement of the pipe 20, the nozzle valve body 38 moves backward, and as a result, the tips of the nozzle valve hole member 41 and the nozzle hole 40 are opened, so that a certain amount of spray fluid 45 is released.
Flows into the nozzle hole 40, mixes with the pressure fluid 6 extending from the through hole 43 to the ejection port 39, and is atomized from the ejection port 39 and is ejected to the outside. During this spraying,
Due to the throttling effect of the nozzle hole 40, the spray fluid 45
Since the outflow amount is small, the pressure of the spray fluid 45 in the metering chamber 24 is slightly lower than the supply pressure of the pressure fluid 6. Therefore, during the spraying operation, the pressure of the pressure fluid 6 is always slightly higher than the pressure of the spraying fluid 45 inside the metering chamber 24, so the spraying operation will not stop midway as long as the trigger operation is continued. .

Note that at this time, some of the pressure fluid 6 enters the supply path 19.
The pressure fluid 6 flows out through the through hole 43, but is sufficiently constricted at the through hole 43 and the amount of outflow there is small. There is almost no descent. Therefore, as long as a sufficient amount of pressure fluid 10 is continuously supplied from the passage 10, the piston 23
is pushed by the pressure fluid 6, overcomes the resistance of the spring 17 and sliding parts, pressurizes the spray fluid 45 in the metering chamber 24, and supplies the spray fluid 45 from the fluid passage 21 to the nozzle hole 40.

Next, when the user stops the trigger operation,
That is, when you release your finger from the trigger 8, the trigger rod 14 returns to its original position and the ball valve 11
The passage 10 is closed. Therefore, the spring receiver 18, the piston 23 and the pipe 20
is returned to its original position by the urging force of the spring 17. Due to the return of the spring receiver 18 and the piston 23, the inside of the metering chamber 24 becomes negative pressure.
A constant amount of atomizing fluid 45 under atmospheric pressure from the inflow channel 32
is refilled into the metering chamber 24 by opening the check valve 33. On the other hand, as the pipe 20 returns, the nozzle valve body 38 also returns to its original position, so the nozzle hole 40 is also closed by the nozzle valve hole member 41 and is ready for the next trigger operation.

Note that while the trigger operation is stopped, the nozzle valve body 38
Since the rod portion 38a is inserted into the tip of the nozzle hole 40, foreign matter is prevented from entering the nozzle hole 40.

[Effect of idea]

As explained above, the quantitative supply nozzle device according to the present invention has the following effects.

Since only one piston is required and the sliding contact area is smaller than that of the conventional model that requires two pistons, the sliding resistance can be reduced accordingly, which improves the spray and return speed. can be accelerated.

In addition, since the sum of the pressure-receiving areas of the intermediate part of the spring receiver and the piston that receive pressure from the pressure fluid and the pressurized area that acts on the spray fluid are set approximately equal, the pressure of the pressure fluid is equal to the injection pressure of the spray fluid. Since it directly corresponds to the injection pressure, it is easy to adjust the injection pressure.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the quantitative supply nozzle device of the present invention, Fig. 2 is an enlarged sectional view of the main part of the fixed quantity supply nozzle device, and Fig. 3 is an explanatory diagram of the pressure receiving area and the pressurizing area. It is. 1...Quantitative supply nozzle device, 2...Device main body,
6... Pressure fluid, 8... Trigger, 15... Piston chamber, 16... Cap, 16a... Passage, 1
7...Spring, 18...Spring receiver, 2
3...Piston, 24...Measuring chamber, 36...Nozzle, 38...Nozzle valve body, 40...Nozzle hole, 4
5...Spray fluid.

Claims (1)

[Claims for Utility Model Registration] In a quantitative supply nozzle device 1 that supplies a fixed amount of spray fluid 45 from a nozzle hole 40 based on the pressurizing action of pressure fluid 6 accompanying a trigger operation, The metering chamber 24 is connected to the metering chamber 24 through the inflow path 32 and the check valve 33 for the spray fluid 45, and the metering chamber 24 is placed in the metering chamber 24 and is pressurized by the pressure fluid 6 by trigger operation to accumulate pressure in the metering chamber 24. sliding piston 23
A spring receiver 18 is fixed to the piston 23 and extends into the piston chamber 15 on the front end side, and a spring receiver 18 is attached to the rear end opening of the device main body 2 and supplies the pressurized fluid 6 in the piston chamber 15 to the front end of the piston 23. a cap 16 having a passage 16a for guiding the piston to the surface side; a spring 17 interposed between the cap 16 and the spring receiver 18 for returning the piston 23 in a direction against the pressure of the pressure fluid 6; Spray fluid 4 guided into calculation chamber 24
5 to the nozzle hole 40, and a nozzle valve body 38 that controls opening and closing of the nozzle hole 40 in conjunction with the sliding movement of the piston 23, and a spring receiver that receives pressure from the pressure fluid 6. 18 and the pressure receiving area of the piston 23 (S1+S2)
A quantitative supply nozzle device 1 characterized in that the pressure area (S3) of the piston 23 that pressurizes the spray fluid 45 is set to be approximately equal.