JPS58122066A - Dispenser - Google Patents

Abstract

PURPOSE:To decrease the number of parts, by forming 2 valves and one elastic member in one body, in a dispenser for sucking up a liquid such as an insecticide, a painting liquid, etc. stored in a vessel, and feeding the liquid into a cylinder by slide-movement of a piston, and discharging it by pressure. CONSTITUTION:A dispenser 10 is provided with a stepped cylinder 12, and a piston 14 is provided in this cylinder. The piston 14 penetrates a through-hole 34 formed on a cap 26, and extends out to the upper part of the cap. The piston 14 receives energizing force in the upper direction by a compression coil 36, and executes a lifting operation as one body with a head 38. Also, a projecting part having a fitting groove 33, and a fitting projection 48 operates as a locking means for locking the piston 14 at its descending position. As the piston 14 descends, a spring 54 energizes a primary valve 22 downward. When a valve rod 50 is pushed up, a shoulder part 52 is separated from the upper end of the piston 14, and communication of a flow passage 19 and a flow-out hole 42 is allowed. Accordingly, a pessurized liquid in a variable space 20 is discharged from the flow-out hole 42, and air of the cylinder 12 flows into a vessel 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dispenser that sucks up a liquid such as an insecticide or a coating liquid stored in a container into a cylinder by sliding a piston and releases it by applying pressure.

Dispensers of this type generally include a gap that controls communication between the liquid contained in the container and the cylinder, and a secondary valve that controls communication between the cylinder and the outflow hole.

- A dispenser using a steel ball as a yawn is known. The steel ball blocks communication between the multi-fluid and the cylinder due to its own weight. However, if the dispenser is turned upside down, the steel ball will move due to its own weight in the direction of opening the communication between the fluid and the cylinder.Therefore, the liquid in the container may leak. As a primary valve, it is biased by an independent elastic member in the direction of cutting off communication between the liquid in the container and the cylinder, and prevents the liquid in the container from flowing out when the dispenser is not in use or during transportation. However, since such a dispenser with a yawn has an independent elastic member, it has the disadvantage that the number of parts is large, the assembly is troublesome, and the production cost is high. Moreover, this elastic member is −
It only has the function of urging the yawn in the direction of cutting off the communication t-a between the liquid in the container and the cylinder. Furthermore, since the release of the yaw stretch is performed only by the negative pressure generated within the cylinder when the piston rises, a malfunction may occur in the yawn motion.

The present invention has been made in view of this point and aims to provide a dispenser which eliminates the drawbacks of the prior art.

In order to achieve the above object, the dispenser of the present invention includes a primary valve disposed below the cylinder to control communication between the cylinder and the liquid in the container, and a flow path formed in the piston and communicating with the outflow hole. a secondary valve that is arranged to be movable up and down and controls communication between the cylinder and the outflow hole, and a first valve that is installed between the -m valve and the lower end of the secondary valve and elastically connects these valves. It includes an elastic member and a second elastic member that is attached to the upper end of the secondary valve and biases the secondary valve in a direction that blocks communication between the cylinder and the outflow hole. At least the primary valve, secondary valve, and first elastic member are integrally formed.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the dispenser 10 includes a stepped cylinder 12 in which a piston 14 is slidably disposed.

The piston 14 is provided with scar-like seals 16 and 18 at the lower end and the middle part, respectively. The skirt-like seal 16 is provided along the small diameter part of the cylinder 12, and the skirt-like seal 18 is provided along the large diameter part of the cylinder. Each slides. Here, the skirt-like seal 18 acts as a seal for preventing negative pressure.

The piston 14 also includes a flow path 19 formed coaxially with the piston, and this flow path communicates with a variable space 20 defined by the movable piston and the fixed cylinder 12. A flow path 21 communicating with the variable space 20 is defined below the cylinder 12, and a primary valve 22 is disposed within the flow path 21. - The extensions 22 are prevented from leaving the flow path 21 by, for example, four valve retainers 23 formed at equal intervals along the inner peripheral surface of the flow path 21. This yawn 22 is not limited to the valve shape shown in FIG. 1, but may also be a valve of other shapes, such as a dotansu. Also, cylinder 1
There are four negative pressure holes 2 equally spaced along the lower end curve of the large diameter part 2.
4 is formed.

A cap 26 is fitted to the upper end of the cylinder 12, and a suction pipe 27 is fitted to the lower end. The cap 26 is screwed onto a container 28 containing a liquid, such as a pesticide. The attachment of the cap 26 to the container 28 is not limited to screwing, and may be, for example, a removable press-fitting. Also,
The cap 26 includes an annular body 30t formed concentrically with the cylinder 12 and extending upwardly from the cap. This annular body 30 has four protrusions 32 formed at equal intervals along its outer cylindrical surface, and each protrusion has an engagement groove 33 on its lower surface. The engagement groove 33 is formed to be able to engage with an engagement protrusion 48 of the head 38, as will be described later.

The piston 14 has a through hole 34 formed in the cap 26.
and extends above the cap. Further, the piston 14 is biased upward by a compression coil spring 36 disposed within the cylinder lz. and,
A head J8 is attached to the upper end of the piston 14.

This head 38 has a nozzle 40 and has a piston/1
Also, the outflow hole 42 of the nozzle 40 communicates with the flow path 19 through a flow path 44.45f formed in the head 3J. Further, the head 38 includes a bottomed cylinder 46t. This bottomed cylindrical body 46 is provided with two locking protrusions 48 formed at equal intervals along the circumferential direction on its inner peripheral surface, and these locking protrusions are connected to the projections 3.
It engages with the engagement groove 33 of No. 2.

As a result, the head 1B and the piston 14 are locked in the illustrated lowered position against the biasing force of the compression coil spring 36. The protruding portion 32 and the engaging protrusion 48 having the engaging groove 33 function as a means for moving the piston 14f to its lowered position.

A valve rod 50 is formed in the piston 14 and is disposed in the AC passage 19 so as to be movable up and down, and its upper end is disposed within the Fia passage 4 and the inside 5. The valve stem 5oFi has a shoulder 52, which is formed so as to be able to abut against the upper end of the piston 14. The valve stem 5o acts as a secondary valve, and the shoulder 52 abuts against the upper end of the piston 14, thereby blocking communication between the flow path 19 and the outflow hole 42. As shown in FIGS. 1 and 2, the valve stem 5o is formed to have a cross-shaped cross section except for its upper end.

Therefore, the liquid can flow smoothly even within the flow path 19. In this example, a first elastic member, such as a waveform spring 54, is bridged between the lower end of the valve stem 50 and the primary valve 22, thereby elastically connecting the valve stem and the primary valve. is connected to. This waveform spring 54 urges the next valve 22'ff downwardly and abuts against the valve seat when the piston 14 shown in FIG. 1 is locked in the lowered position.

Therefore, communication between the variable space 20 and the liquid in the container 28 is reliably blocked. In one embodiment, the upper end of the valve stem 50 has a second elastic member, for example a corrugated spring 56, attached to the upper end. A support plate 58 is attached to the extending end of the wave spring 5#. In this waveform dneii#i, in the state shown in FIG.
The larger valve rod 50f that is in contact with the upper end is biased downward, that is, the shoulder portion 52 is in contact with the upper end of the piston 14, and in the direction of blocking communication between the flow path 19 and the outflow hole 42. There is.

Note that when the piston 14 is locked in its lowered position as shown in FIG. 1, the wave spring 54 is compressed and urges the primary valve 22 downward and also urges the valve stem 50 upward. . Ninthly, the waveform spring 56Fi urges the valve stem 50' ft downward against the urging force of the waveform spring 54 and cuts off the communication between the flow path 19 and the outflow hole 42. By setting an appropriate value, the p-wave spring 54 can also have a larger biasing force. The yawn 22, the wave spring 54, the valve stem 50, the wave spring 56, and the support grate 68 are integrally molded from synthetic resin. In addition,
The first and second elastic members may be shaped like rings shown in the third factor, instead of being added to the wave spring.

When the dispenser 10 configured as described above is not used or transported, the piston: /I
4f Lock in its lowered position.

As a result, communication between the liquid in the container 28 and the variable space 20 is cut off by the primary valve 22, and communication between the flow path 19 and the outflow hole 42 is cut off by the valve rod 50, which is a secondary valve. Therefore, even if the dispenser is turned upside down, the liquid in the container 28 will flow through the outflow hole 42.
f: There is no leakage to the outside via.

The dispensing operation of the dispenser 10 will be explained below. First, in the state shown in FIG. 1, the piston 14 is unlocked. Then, the piston 14 slides upward within the cylinder 12 due to the biasing force of the compression coil spring S6. As the piston 14 rises, the total volume of the variable space 20 gradually increases, and the inside of the variable space becomes negative pressure. Therefore, −
The yawning 2z is pulled up by the suction force generated in the variable space 20 until it comes into contact with the valve stone 23. Also, when the piston 14 rises, the shoulder 52 is in contact with the upper end of the piston, so the valve stem 50 is also pulled up. Rise. As the valve stem 50 rises, the wave spring 54 extends, and when it exceeds its free length, the wave spring 64 biases the primary valve 22t upwards. He was forcibly pulled up.

In this way, - the yawn 22 is forcibly pulled up by the wave spring 64, so that there is no malfunction in the opening operation; therefore, the liquid in the container 28 is transferred to the suction tube 2;
7. The liquid flows into the variable space 20 through the flow path 21, and preparations for the discharge process as shown in FIG. 4 are completed. Here, since the piston 14 rises in the next state with communication between the flow path 19 and the outflow hole 42 blocked, air does not flow into the variable space 20 via the outflow hole and the flow path 19. Also,
Since the negative pressure in the container 28 is removed by air flowing in through the negative pressure hole znt-, the liquid can surely flow into the variable space 20.

Then, from the state shown in FIG. 4, the head 38 is pressed and the piston 714'if
lower it. Variable space 2Q along with the lower cape of piste 714
The total volume of is reduced and the liquid within the variable space is pressurized. Then, the pressure of the liquid in the variable space 20 is gradually increased, and this pressurized liquid pushes up the valve stem 50 against the urging force of the waveform spring 56. Here, the yawn stretch 22 is suppressed downward by the pressurized liquid, cutting off communication between the liquid in the container 28 and the variable space 20. Also, as the piston 14 descends, the waveform splash 54 It contracts and urges the primary valve 22 downward.Therefore, communication between the liquid in the container 28 and the variable space 20 is more reliably cut off.Then, as the valve stem 5o is pushed up, the shoulder part 62 is spaced apart from the upper end of the piston z4, allowing communication between the flow path 19 and the outflow hole 42. Therefore,
The pressurized liquid in the variable interval 2Q is discharged from the outlet hole 42 of the nozzle 4Q via the flow path 19145.44. Here, the air that has flowed into the large diameter portion of the cylinder 12 through the through hole 34f of the cag 26 flows into the container 28 through the negative pressure hole 24, and negative pressure inside the container is prevented.

It goes without saying that the dispenser 10 can also be used as a sprayer or foamer (by installing a spinner or foaming means in the outflow hole d2).

After that, if the pressing force applied to the head 38 is removed,
The p-piston 14 rises together with the head 38 due to the biasing force of the compression coil spring 34. 'When the piston 14 rises, as described above, fluid flows into the variable space 2Q to prepare for the next discharge process, and continuous discharge can be performed if necessary.

As described in detail above, the dispenser of the present invention includes a primary valve disposed below the cylinder to control communication between the cylinder and the liquid in the container, and a flow path formed in the piston that communicates with the outflow hole. a secondary valve that is arranged to be movable up and down and controls communication between the cylinder and the outflow hole; - a first elastic valve that is installed between the yawn and the lower end of the secondary valve and elastically connects the valves; and a second elastic member that is attached to the upper end of the secondary valve and biases the secondary valve in the direction of communication between the cylinder and the outflow hole. At least the primary valve, secondary valve, and first elastic member are integrally formed. In this way, the yawn, the secondary valve and the first elastic member are integrally formed; the number of parts in the dispenser is reduced, reducing production costs and simplifying assembly. The first elastic member, which elastically connects the yawn and the secondary valve, biases the primary valve in the direction of cutting off communication between the liquid in the container and the cylinder by 1g at the lowered position of the piston, and As the pressure rises, the primary valve is biased in a direction that allows communication between the liquid in the container and the cylinder. Therefore, - the opening/closing operation is reliably performed without causing any malfunction; and the first elastic member has not only one function but two functions as described above, and is effectively utilized. Furthermore, since the yawn and the secondary valve are connected by an elastic member and another elastic member is attached to the upper end of the secondary valve, the tolerances and mounting errors of the related members can be large.

The above-mentioned embodiments are for illustrating the present invention and are not intended to limit the present invention in any way, and all modifications and modifications within the technical scope of the present invention are also included in the present invention. There's no need to accept it. For example, in the above embodiment, the second elastic member is integrally formed with the yawn, secondary valve, and first elastic member to further reduce the number of parts, but the elastic member II2 is formed separately. It may also be formed by

[Brief explanation of drawings]

Figures 1 and 4 are from this F! 2 is a perspective view of the primary valve, the valve stem, the first elastic member, and the second elastic member, and FIG. 3 is a perspective view of the first elastic member. FIG. 3 is a schematic perspective view showing an example of a hairstyle of an elastic member. 10... Dikobe/Sir, 12... Cylinder, 14
... Piste/, 19+ no, i4. -5... Streamline, 22... - yawning, -2... Outflow hole, 50... Valve stem, 54.56... Wave spring. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 3

Claims (1)

[Claims] In a dispenser that sucks liquid stored in a container into the cylinder by sliding a piston and releases it from the outflow hole by applying pressure, communication between the cylinder located below the cylinder and the liquid in the container is controlled. a secondary valve that controls communication between the fill cylinder and the outflow hole, which is movably disposed in a flow path formed in the piston and communicates with the outflow hole;
- A first elastic member installed between the yawn and the lower end of the secondary valve to elastically connect these valves, and a first elastic member installed at the upper end of the secondary valve to connect the secondary valve to the cylinder and the outflow hole. and a second elastic member biasing in a direction to cut off communication, wherein at least the primary valve, the secondary valve, and the first elastic member are integrally formed.