JPS5815014Y2 - sprayer - Google Patents

Description

[Detailed description of the invention] This invention relates to a sprayer for spraying liquids such as insecticides, paints, pharmaceuticals, and industrial agents.

Generally, in this type of sprayer, a piston is inserted into one end of a hollow cylinder so that it can freely reciprocate, and when the piston is moved to the outside of the cylinder, a primary check valve installed at the bottom of the cylinder is opened, and the liquid inside the cylinder is removed from the container. When the liquid is sucked up into the pressurizing chamber and the piston is moved inside the cylinder, a secondary check valve provided on the nozzle side is opened and the liquid in the liquid pressurizing chamber is sprayed from the nozzle.

By the way, when starting to use the sprayer, air is present in the liquid pressurizing chamber, so this air must first be exhausted and then the liquid in the container must be sucked up into the liquid pressurizing chamber to perform the spraying operation. Because the compression ratio was so large, even if the piston was moved inward into the cylinder, sufficient pressure was not generated within the liquid pressurization chamber to open the secondary check valve, so air was retained within the liquid pressurization chamber. It becomes a state.

Therefore, even if the piston is moved outside the cylinder by the compression spring, no negative pressure is generated, so the secondary check valve does not open and the liquid cannot be sucked up.

However, in recent years, as the demand for improved spray patterns and atomization of spray particles has increased, sprayers have been proposed that are configured to open the primary check valve only when the pressure in the liquid pressurizing chamber exceeds a predetermined high pressure. In this type of structure, the presence of air becomes a serious problem.

This idea was devised in response to the above circumstances, and its purpose is to create a seal structure that allows air to escape from the liquid pressurizing chamber when the piston moves inward by a predetermined amount. It is an object of the present invention to provide a sprayer capable of sucking up liquid into a liquid pressurizing chamber and immediately performing a spraying operation.

This invention will be explained below with reference to illustrated embodiments.

The sprayer shown in Fig. 1 is a so-called button-type sprayer made almost entirely of synthetic resin, and includes a container 1 for holding a liquid such as an insecticide, and a screw cap 3 attached to the top and end of the container 2. The nozzle head 5 is held at the upper part of the cylinder structure 4 and the cover cylinder 6 is fitted and fixed to the outer periphery of the screw cap 3.

A cylinder 7 extending substantially vertically is integrally formed in the center of the cylinder body 4, and a closing body 1 holding a suction pipe 8 and a primary check valve 9 is provided at the lower end of the cylinder.
0 is press-fitted in a liquid-tight manner.

A spring seat body 11 and a guide tube 12 are fitted and held at the upper end of the closure body 10, and the upper end of the guide tube is fitted into a vertical cylindrical portion 13 formed in the cover housing 6.

The upper part of the vertical cylinder part 13 is provided with large and small horizontal cylinder parts 14 and 15 that extend concentrically with each other, the large diameter horizontal cylinder part 14 has a large diameter piston valve 16, and the small diameter horizontal cylinder part 15 has a small diameter poppet The valves 17 are each disposed fluid-tightly and slidably.

A cylindrical plug 18 is press-fitted into the front end of the large-diameter horizontal cylindrical portion 15, and a compression spring 20 is disposed between the inner end of the plug and the stepped portion 19 of the piston valve.

On the other hand, a compression spring 21 is disposed between the poppet valve 17 and the bottom end of the small diameter horizontal cylindrical portion 15. Therefore, the piston valve 16 and the poppet valve 17 are connected to the compression springs 20, 2.
1 abut against each other to form a secondary check valve 22.

A nozzle cap 23 is fitted to the piston valve 16''9J to constitute the nozzle head 5, and a nozzle spout 24 formed at the center of the tip of the nozzle cap 23 is fitted to the piston valve 16''9J.
6, the aforementioned secondary check valve 22, passages 27 and 28 formed in the cylindrical parts 14 and 13, and a passage 29 and slit 30 formed in the guide tube 12. and communicates with the inside of the cylinder 7.

A cylindrical piston 31 is fitted into the guide tube 12 so as to be able to move up and down, and the lower end of the piston is connected to the cavity 32 of the cylinder 7.
It is inserted into the first gap 32a by pressing the button.

A large cavity 33 is formed in the upper part of the cavity 32, and a lip part 3 extending from the upper part of the piston is attached to the inner wall of the large cavity 33.
4 are liquid-tightly and slidably engaged.

On the other hand, an annular sealing member 35 made of an O-ring is disposed below the piston 31, and this sealing member fluid-tightly and slidably engages with the outer wall of the guide tube 32 and the inner wall of the cavity 32, and is fitted inside the cylinder 7. A liquid pressurizing chamber 36 is formed therein.

Further, an annular spring seat 37 is disposed below the seal member 35, and a compression spring 38 disposed between the spring seat 37 and the spring seat 11 is compressed between the spring seat 37 and the seal member 35. The piston 31 is urged upward through the .

The inner wall of the lower part of the cylinder 7, that is, the inner wall of the lower part of the liquid pressurizing chamber 36, is formed larger than the outer diameter of the sealing member 35 to form a large diameter part 39, so that when the piston 31 descends by a predetermined amount, A second gap 40 (FIG. 2) is formed between the seal member 35 and the large diameter portion 39.

On the other hand, a ventilation hole 41 communicating with the inside of the container 1 is provided at the lower end of the large cavity 33, and when the second gap 40 is opened,
The liquid pressurizing chamber 36 communicates with the inside of the container 1 through the gap 40, the first gap 32a1, the large cavity 33, and the ventilation hole 41.

A pair of support protrusions 42 are provided on the front upper surface of the cylinder structure 4.
(only one is shown in the figure), and a shaft pin 44 provided at the tip of the suppression lever 43 is rotatably supported by the protrusion.

The push-up lever 43 has a button with a hole 45 that freely passes through the cylinder parts 13, 14, and 15 in order to prevent its pivotal movement from being obstructed by the cylinder parts 13, 14, and 15, and a hole 45 on the lower surface in the approximately center thereof. It is provided with a pair of suppressing protrusions 46 (only one is shown in the figure) that engages with the shoulder portion of the upper surface of the piston 31.

On the other hand, a vertically elongated guide recess 47 is provided at the rear of the cover housing 6.
A button 48 having a cross-sectional shape substantially the same as the button is fitted into the recess so as to be movable up and down.

The bush button 48 slides on the inner wall of the recess 47, and its vertical movement is controlled by engaging a protrusion 50 in a pair of slots 49 (only one shown in the figure) formed in the inner wall. Regulated.

The rear end of the pressing lever 43 engages with the lower surface of the bushing button 48. Therefore, when the bushing button is pressed down, for example, the piston 31 is lowered via the lever 43, and the bushing button 48 is also actuated. When the force is released, the compression spring 38 pushes up the piston 31 and at the same time raises the lever 43 and button 48.

Reference numeral 51 denotes a negative pressure prevention hole formed in the large cavity 33 of the cylinder 7, which connects the inside of the container 1 with outside air when the lip portion 34 of the piston passes through the hole 51 and descends. Prevent negative pressure from occurring.

The operation of this embodiment will be explained below.

Before starting the spraying operation, the liquid pressurizing chamber 36 is filled with air, and the liquid in the container 1 has not yet been sucked up into the saliva pressurizing chamber.

In this state, when the button 48 is pressed down to lower the piston 31, the air in the liquid pressurizing chamber 36 is compressed by the piston 31, but since the compression ratio of the air is extremely high, the secondary check valve 22 It won't reach enough pressure to open.

Particularly, in this embodiment, the secondary check valve 22 is composed of a piston valve 16 and a poppet valve 17, which are brought into contact with each other and closed by compression springs 20, 21, and the liquid pressurizing chamber 36 is closed.
Since the check valve 22 is constructed to open only when a considerable amount of high pressure is generated inside, the check valve cannot be opened with the pressure obtained by compressing air.

However, as the piston 31 continues to descend further and approaches the lower end of its downward stroke (FIG. 2), the seal member 35 reaches the large diameter portion 36 of the liquid pressurizing chamber 36, creating a gap 40.

Therefore, the compressed air in the liquid pressurizing chamber escapes into the container 1 through the gap 40.32a, the large cavity 33, and the vent hole 41, and the inside of the liquid pressurizing chamber 36 becomes at normal pressure.

Next, when the force acting on the button 48 is relaxed,
A negative pressure is generated in the pressurizing chamber from the time when the piston 31 is raised by the compression spring 38 and the sealing member 35 passes over the large diameter portion 39 and again engages the inner wall of the pressurizing chamber 36 in a liquid-tight manner.

Therefore, the liquid in the container 1 is sucked up into the pressurizing chamber 36 via the suction pipe 8, the primary check valve 9, and the slit 30.

By repeating the above steps several times, the pressurized chamber is immediately filled with liquid.

Since the compressibility of liquid is extremely small compared to air, if the piston 31 is lowered again in this state, the pressurizing chamber 36 will be immediately compressed.
The pressure inside becomes high, and the liquid flows through the slit 30 and the passages 29 and 28.
, 27'e, the piston valve 16 and the poppet valve 17 are moved away from each other, and the secondary check valve 22 is opened. It is sprayed as fine particles.

On the other hand, when the sealing member 35 reaches the increased diameter portion 39 or the downward speed of the bushing button 48 becomes slow, the pressure inside the pressurizing chamber 36 decreases, so that the piston valve 16 and the poppet valve 17 are instantly compressed by the compression springs 20 and 21. The secondary check valve 22 is closed to immediately stop spraying the liquid.

Next, when the piston 31 begins to rise again, liquid is sucked up into the pressurizing chamber 36 via the suction pipe 8 and the primary check valve 9 in preparation for the next spraying operation.

FIG. 3 shows a modification of the annular seal member 35. As shown in FIG.

This annular sealing member consists of a ring body fixed to the lower end of the piston 31, and each ring body has a skirt-like lip portion 52, 53 that slides liquid-tightly on the inner wall of the cavity 32 and the outer wall of the guide tube 12. and a downwardly facing recess 54.
directly supports the upper end of the compression spring 38.

As in the previous embodiment, the lip portion 52 opens the gap 40 when it reaches the large diameter portion 39.

In this modification, the upper end of the compression spring 38 is directly supported by the seal member 35, so the seat body 37 as in the previous embodiment is not required.

As explained above, the sprayer according to this invention has the outer diameter of the piston smaller than the inner diameter of the cylinder, and the first
An annular seal member is provided at the bottom of the piston that slides liquid-tightly on the inner wall of the cylinder, and the inner diameter of the lower part of the cylinder is made larger than the outer diameter of the annular seal member, and the piston is lowered by a predetermined amount. At the time of operation, a second gap is formed between the annular seal member and the large diameter portion of the cylinder, and the air in the liquid pressurizing chamber is released through the gap and the first gap. Even if the liquid pressurizing chamber is filled with air, the air can immediately escape from the first and second gaps each time the piston descends. Therefore, the liquid can be immediately sprayed by simply pushing down the piston several times. be able to.

This structure is particularly effective for a sprayer in which the secondary check valve is configured to open only at a predetermined high pressure.

Although the above-described embodiment is an application of this invention to a button-type atomizer, it is of course possible to apply the invention to other types of atomizers.

Further, the sealing member does not necessarily need to be disposed at the lower end of the piston, and may be disposed at a predetermined position below the piston.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing a sprayer which is an embodiment of this invention, Fig. 2 is a partial view showing the state when the piston is in its lowest position, and Fig. 3 is a modification of the annular seal member. FIG. 5... Nozzle head, 1... Cylinder, 9... Primary check valve, 22... Secondary check valve, 31...
... Cylindrical piston, 32... Cavity, 32a... Gap, 35... Annular seal member, 36... Liquid pressurizing chamber, 3
T... Annular spring seat body, 38... Compression spring, 39...
・Large diameter portion, 40...Gap, 52.53...Skirt-like lip portion, 54...Recess.

Claims (3)

[Scope of utility model registration request] (1) A piston is reciprocally inserted into the upper end of a hollow cylinder extending in a vertical direction to form a liquid pressurizing chamber in the cylinder, and a compression spring is interposed between the piston and the bottom of the cylinder. When the piston pressurizes the liquid in the liquid pressurizing chamber and atomizes it from the spray nozzle when the piston is downwardly suppressed, the liquid is sucked up by the negative pressure generated in the liquid pressurizing chamber when the piston is upwardly moved by the compression spring. The outer diameter of the piston is formed to be smaller than the inner diameter of the cylinder to form a first gap between the two, and an annular sealing member that slides liquid-tightly on the inner wall of the cylinder is disposed at the lower part of the piston. The outer diameter of the seal member is larger than the outer diameter of the seal member, and when the piston is lowered by a predetermined amount, a second gap is formed between the annular seal member and the large diameter portion of the cylinder, and liquid flows from this gap and the first gap. A sprayer characterized by being configured to release air within a pressurized chamber. (2) Claims for registration of a utility model characterized in that the annular sealing member is formed from a 01J ring, and an annular spring seat supporting the upper end of the compression spring is disposed at the end of the QIJ song. The sprayer according to item 1. (3) The annular seal member is formed of a ring body having a skirt-like lip portion and a downward recess, the upper end of the ring body is fixed to the lower end of the piston, and the upper end of the compression spring is directly supported in the recess. The sprayer according to claim 1, which is a utility model.