JP6929246B2 - Triggered liquid ejector - Google Patents

Description

The present invention relates to a trigger type liquid ejector.

As a trigger type liquid ejector, for example, the configuration of Patent Document 1 below is known. The trigger type liquid ejector includes an ejector main body mounted on a container body containing a liquid, and a nozzle portion arranged in front of the ejector main body and having a ejection hole for ejecting the liquid. ..
The ejector main body is arranged in front of the vertical supply cylinder portion extending in the vertical direction and the vertical supply cylinder portion, and guides the liquid in the vertical supply cylinder portion to the ejection hole, and is forward in front of the vertical supply cylinder portion. It is provided with a trigger portion arranged so as to be movable backward in an urged state, a piston that moves back and forth with the front-back movement of the trigger portion, and a cylinder that is pressurized and depressurized with the back-and-forth movement of the piston.

The vertical supply cylinder portion described above has a double cylinder shape of an inner cylinder and an outer cylinder. The inner cylinder is formed with a valve seat portion protruding from the inner peripheral surface. In the inner cylinder, a ball valve that can be separated from the valve seat is accommodated in the accommodation space defined by the valve seat portion and the top wall portion of the outer cylinder. The accommodation space communicates with the inside of the cylinder and the inside of the injection cylinder through a communication passage formed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder.

In the trigger type liquid ejector described above, when the trigger portion is pulled backward, the piston moves backward while being guided by the piston guide formed in the cylinder. As a result, the inside of the cylinder is pressurized. When the inside of the cylinder is pressurized, the liquid in the cylinder flows into the accommodation space through the connecting passage, and the ball valve is pressed against the valve seat portion. As a result, the communication between the inside of the container and the communication passage is cut off, so that the liquid in the cylinder is ejected from the ejection hole through the vertical supply cylinder portion and the injection cylinder portion.
On the other hand, when the piston moves forward as the trigger portion moves forward (returns), the pressure inside the cylinder is reduced. When the pressure inside the cylinder is reduced, the liquid inside the container is sucked up into the inner cylinder, and the ball valve is pushed up. As a result, the ball valve is separated from the valve seat portion, and the liquid flows into the cylinder through between the ball valve and the valve seat portion.

Japanese Unexamined Patent Publication No. 2017-47350 Japanese Unexamined Patent Publication No. 2007-175609

By the way, in the above-mentioned trigger type liquid ejector, an adapter for forward inversion may be provided at the lower end of the vertical supply cylinder portion in order to enable the ejection operation in both the upright position and the inverted state (for example,). See Patent Document 2 above).
However, when the trigger type liquid ejector having the forward inverted adapter is used in the inverted position, the ball valve is separated from the valve seat portion by its own weight. In this state, if the piston moves backward during the ejection operation, the liquid in the cylinder or the connecting passage may flow toward the container body through the gap between the ball valve and the valve seat portion. That is, in the inverted posture, it may not be possible to efficiently supply the liquid in the cylinder or the connecting passage to the injection cylinder portion, and it may be difficult to eject a desired amount of liquid according to the amount of movement of the piston. .. As a result, there is a possibility that the injection amount varies between the upright posture and the inverted posture.

An object of the present invention is to provide a trigger type liquid ejector capable of suppressing variation in injection amount in an upright posture and an inverted posture.

In order to solve the above problems, the present invention proposes the following aspects.
The trigger type liquid ejector according to one aspect of the present invention is arranged in front of the ejector main body and the ejector main body attached to the container body in which the liquid is stored, and has an ejection hole for ejecting the liquid. The ejector main body is provided with a nozzle portion and an upside-down adapter attached to the lower end portion of the ejector main body, and the ejector main body extends in the vertical direction and has an eclipsed tubular shape that sucks up the liquid in the container. In a state of being urged forward in front of the vertical supply cylinder portion, the injection cylinder portion which is arranged in front of the vertical supply cylinder portion and guides the liquid in the vertical supply cylinder portion to the ejection hole, and the vertical supply cylinder portion. A trigger portion arranged so as to be movable rearward, a piston in which the trigger portion is connected and moves back and forth with the back and forth movement of the trigger portion, and a cylinder that is pressurized and depressurized with the back and forth movement of the piston. The vertical supply cylinder portion communicates with the container body, surrounds the inner cylinder having a valve seat portion protruding from the inner peripheral surface, and surrounds the inner cylinder, and also includes the injection cylinder portion and the injection cylinder portion. An outer cylinder that defines a communication passage communicating with the inside of the cylinder with the outer peripheral surface of the inner cylinder is provided, and in the inner cylinder, the valve seat portion and the top wall portion of the vertical supply cylinder portion are provided. In the accommodating space defined by the above, a first switching valve that communicates with the connecting passage and can be connected to and detached from the valve seat portion is accommodated, and the upside-down adapter is the container body through the upright introduction port. The adapter body and the ejector body are defined as a first space for communicating between the vertical supply cylinder and the inside of the vertical supply cylinder, and a second space for communicating the inside of the container and the first space through an inverted introduction port, and the ejector body. A second space that is mounted on the container body and blocks communication between the first space and the second space when the container body is upright, and communicates with the first space and the second space when the container body is inverted. A switching valve is provided, and when the container body is inverted, the first switching valve is separated from the valve seat portion by its own weight and abuts on the top wall portion, and the first switching valve is viewed in a vertical cross section along the vertical direction. 1 Assuming that the minimum cross-sectional area in the gap between the switching valve and the valve seat portion in the direction orthogonal to the valve seat portion is D1 and the minimum opening area of the valve seat portion is D2, 0.62 ≦ D2 / D1 ≤3.62 is set, and the outer cylinder is formed with a discharge port that communicates with the injection cylinder portion through the communication passage. If the minimum cross-sectional area of the discharge port is D3, 0.53 ≤ D3 / D1 ≤3.1 is set .

According to this configuration, the cross-sectional area D1 can be made relatively small by setting D2 / D1 to 0.62 or more. Therefore, it becomes difficult for the liquid flowing in the connecting passage to pass through the gap between the first switching valve and the valve seat portion during the ejection operation in the inverted posture. That is, among the liquids flowing in the connecting passage, the liquid can be efficiently introduced into the injection cylinder portion by controlling the flow of the liquid flowing into the injection cylinder portion as compared with the flow of the liquid passing through the gap. As a result, it is possible to suppress the variation in the amount of ejection between the upright posture and the inverted posture.
On the other hand, by setting D2 / D1 to 3.62 or less, the gap can be set to a size that allows the liquid sucked up from the container body to pass when a negative pressure is generated in the cylinder. Therefore, since the piston can be moved smoothly, the liquid can be efficiently introduced into the cylinder and the operability of the trigger portion can be improved.

In the trigger type liquid ejector according to the above aspect, 1.7 mm ² ≤ D1 ≤ 10.0 mm ² may be set.
According to this configuration, the cross-sectional area D1 can be made relatively small by setting the cross-sectional area D1 to 10.0 mm ^{2 or less.} Therefore, as described above, it is possible to secure the ejection amount in the inverted posture and suppress the variation in the ejection amount between the upright posture and the inverted posture.
On the other hand, by setting the cross-sectional area D1 to 1.7 mm ² or more, the liquid can be efficiently introduced into the cylinder when a negative pressure is generated in the cylinder, and the operability of the trigger portion can be improved.

In the trigger type liquid ejector according to the above aspect, the specific gravity of the first switching valve may be larger than that of water.
According to this configuration, the first switching valve can be reliably seated on the valve seat portion in the upright posture. As a result, the amount of ejection in the upright posture can be stabilized.

According to each aspect of the present invention, it is possible to suppress variations in the injection amount in the upright posture and the inverted posture.

It is a partial cross-sectional view of the ejection container which concerns on 1st Embodiment. It is a top view of the forward inverted adapter which concerns on 1st Embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the following description, an ejection container in which the trigger type liquid ejector according to the present invention is attached to the container body will be described. Further, in each of the following embodiments, the corresponding configurations may be designated by the same reference numerals and description thereof may be omitted.
(First Embodiment)
The ejection container 1 shown in FIG. 1 includes a container body 2 in which a liquid is stored, a trigger type liquid ejector (hereinafter, simply referred to as an ejector 3) detachably attached to a mouth portion 2a of the container body 2. It has.
The ejector 3 includes an ejector main body 10, a nozzle portion 11, and an upside-down adapter 12. The liquid contained in the container 2 of the present embodiment is, for example, a detergent used in bathrooms, toilets, etc. (which contains a surfactant and foams) and has a viscosity equivalent to that of water. Those are preferably used. However, the liquid contained in the container body 2 can be changed as appropriate.

The ejector main body 10 includes a vertical supply cylinder portion 14 that sucks up the liquid in the container body 2, an injection cylinder portion 15 that guides the liquid sucked up by the vertical supply cylinder portion 14 to the nozzle portion 11, and a vertical supply cylinder portion 14 and injection. A trigger mechanism 16 for circulating a liquid in the cylinder portion 15 is provided.
In the following description, the direction of the vertical supply cylinder portion 14 (upper outer cylinder portion 23, which will be described later) along the first axis O1 is referred to as a vertical direction. In the upright posture of the ejector container 1, the direction toward the container body 2 in the vertical direction is referred to as the lower side, and the direction toward the ejector 3 is referred to as the upper side. In a plan view seen from the vertical direction, the direction intersecting the first axis O1 is called the radial direction. Of the radial directions, one direction is referred to as the front-rear direction, the direction in which the injection cylinder portion 15 extends from the vertical supply cylinder portion 14 is referred to as the front side, and the opposite direction is referred to as the rear side. Further, among the radial directions, the direction orthogonal to the front-rear direction is referred to as the left-right direction. In the illustrated example, the first axis O1 is eccentric to the rear with respect to the container axis of the container body 2. However, the first axis O1 and the container axis may be coaxial.

The vertical supply cylinder portion 14 includes an outer cylinder 21 and an inner cylinder 22.
The outer cylinder 21 is formed in a multi-stage cylinder shape in which the diameter is increased toward the lower side. Specifically, the outer cylinder 21 includes an upper outer cylinder portion 23 and a lower outer cylinder portion 24 extending downward from the upper outer cylinder portion 23. In the present embodiment, both the upper outer cylinder portion 23 and the lower outer cylinder portion 24 are formed in the shape of an eclipsed cylinder.

A discharge port 26 that opens toward the front is formed on the upper portion of the peripheral wall portion of the upper outer cylinder portion 23.
In the peripheral wall portion of the upper outer cylinder portion 23, a supply port 27 that opens toward the front is formed at the central portion in the vertical direction.

A communication groove 29 extending in the vertical direction is formed on the inner peripheral surface of the upper outer cylinder portion 23 (peripheral wall portion). The upper end of the communication groove 29 communicates with the discharge port 28. The lower end of the communication groove 29 is opened at the lower end edge of the upper outer cylinder portion 23. The peripheral wall portion of the upper outer cylinder portion 23 penetrates the top wall portion of the lower outer cylinder portion 24.

The inner cylinder 22 is fitted into the outer cylinder 21 from below the outer cylinder 21. The inner cylinder 22 is formed in a multi-stage cylinder shape in which the diameter is increased toward the lower side. Specifically, the inner cylinder 22 includes an upper inner cylinder portion 31 and a lower inner cylinder portion 32 connected below the upper inner cylinder portion 31.
The upper inner cylinder portion 31 is arranged coaxially with the upper outer cylinder portion 23. The upper inner cylinder portion 31 is fitted into the upper outer cylinder portion 23 from below the upper outer cylinder portion 23. The upper portion of the upper inner cylinder portion 31 constitutes a small diameter portion 34 having a smaller outer diameter than the lower portion. Therefore, a connecting passage S1 is formed between the inner peripheral surface of the upper inner cylinder portion 31 (peripheral wall portion) and the outer peripheral surface of the small diameter portion 34. The connecting passage S1 connects the discharge port 26 and the supply port 27 described above. The upper end edge of the small diameter portion 34 is close to or in contact with the top wall portion of the upper outer cylinder portion 23 from below the upper outer cylinder portion 23.

As shown in FIG. 2, the outer diameter of the upper end portion of the small diameter portion 34 is gradually reduced toward the upper side. A rib 33 protruding inward in the radial direction is formed at the upper end of the small diameter portion 34. A plurality of ribs 33 extend in the vertical direction and are formed at intervals in the circumferential direction.

In the small diameter portion 34, a valve seat portion 35 is provided so as to project inward in the radial direction at a portion located at the lower end portion of the rib 33. The valve seat portion 35 is formed in a tapered tubular shape extending downward toward the inside in the radial direction. In the inner cylinder 22, the space surrounded by the small diameter portion 34, the valve seat portion 35, and the top wall portion 23a of the upper outer cylinder portion 23 defines an accommodation space 40 in which the ball valve (first switching valve) 41 is accommodated. It is made up. The ball valve 41 is configured to be detachable from the valve seat portion 35 by the pressure in the accommodating space 40 and its own weight. The ball valve 41 of the present embodiment has a higher specific gravity than water or a liquid contained in the container body 2, and is made of a material that can be seated on the valve seat portion 35 by its own weight when the ejection container 1 is in the upright posture. It is formed. As such a material, a metal material (for example, SUS) is preferably used for the ball valve 41 of the present embodiment. However, the ball valve 41 may be made of a material other than a metal material (for example, glass) as long as the above conditions are satisfied.

The accommodation space 40 communicates with the communication passage S1 described above through a notch 42 formed at the upper end edge of the small diameter portion 34.

The lower inner cylinder portion 32 is fitted to the lower outer cylinder portion 24 from below the lower outer cylinder portion 24. In the top wall portion 45 of the lower inner cylinder portion 32, a through hole 48 that penetrates the top wall portion 45 in the vertical direction is formed in the inner peripheral portion. In the through hole 48, the lower end portion (the portion protruding from the lower inner cylinder portion 24) of the peripheral wall portion of the upper outer cylinder portion 23 is inserted. The peripheral wall portion of the upper outer cylinder portion 23 partitions the inside of the through hole 48 in the radial direction. That is, the inner side of the through hole 48 in the radial direction with respect to the peripheral wall portion of the upper outer cylinder portion 23 communicates with the communication groove 29. On the other hand, of the through holes 48, the outer side in the radial direction with respect to the peripheral wall portion of the upper outer cylinder portion 23 communicates with the space defined by the lower outer cylinder portion 24 and the lower inner cylinder portion 32.

An outer flange 51 projecting outward in the radial direction is formed on the peripheral wall portion of the lower inner cylinder portion 32. In the present embodiment, the axes of the lower outer cylinder portion 24 and the lower inner cylinder portion 32 (hereinafter referred to as the second axis O2) are eccentric to the front with respect to, for example, the first axis O1.

The ejector main body 10 includes a mounting cap 52 for attaching the ejector 3 to the container body 2. The mounting cap 52 is formed in a tubular shape extending in the vertical direction. The mounting cap 52 is mounted (for example, screwed) on the mouth portion 2a in a state where the outer flange 51 of the lower inner cylinder portion 32 is sandwiched between the outer flange 51 and the upper end edge of the mouth portion 2a.

The injection cylinder portion 15 is integrally formed with the upper outer cylinder portion 23. The injection cylinder portion 15 projects forward from the upper end portion of the upper outer cylinder portion 23. The inside of the injection cylinder portion 15 communicates with the above-mentioned communication passage S1 through the discharge port 26.

The trigger mechanism 16 includes a pump portion 61 having a cylinder 71 and a piston 72, a cover body 62, a trigger portion 63, and an elastic plate portion 64.
The cylinder 71 is formed in a bottomed cylinder shape that opens forward. In the following description, the central axis of the cylinder 71 will be the cylinder axis O3. The cylinder shaft O3 extends in the front-rear direction.

The cylinder 71 includes an accommodating cylinder 77 and a piston guide 78 extending coaxially with the cylinder shaft O3, and a bottom wall portion 79 connecting the accommodating cylinder 77 and the rear end edges of the piston guide.

The storage cylinder 77 is fitted in a cylinder portion 75 formed below the injection cylinder portion 15. The cylinder portion 75 is integrally formed with the vertical supply cylinder portion 14 and the injection cylinder portion 15. The cylinder portion 75 opens toward the front, and the rear end opening is closed by the upper outer cylinder portion 23.

The bottom wall portion 79 is formed with a communication port 81 that communicates with the above-mentioned supply port 27.
The piston guide 78 projects forward from the inner peripheral edge of the bottom wall portion 79. The piston guide 78 is formed in the shape of an eclipsed cylinder that opens toward the rear.

The piston 72 is housed in the housing cylinder 77 so as to be movable back and forth. The piston 72 includes a piston body 91, an inner sliding portion 92, and an outer sliding portion 93.
The piston body 91 is formed in the shape of an eclipsed cylinder that opens toward the rear. The piston guide 78 described above is inserted inside the piston body 91.

The inner sliding portion 92 extends inward in the radial direction from the rear end opening edge of the piston body 91 toward the rear. The rear end portion of the inner sliding portion 92 is configured to be slidable on the outer peripheral surface of the piston guide 78 as the piston 72 moves back and forth.

The outer sliding portion 93 is connected to the lower end portion of the piston body 91. The outer sliding portion 93 surrounds the periphery of the piston body 91. The outer sliding portion 93 is formed in a tapered tubular shape whose diameter is gradually increased from the central portion in the front-rear direction toward the front and the rear. Both front and rear ends of the outer sliding portion 93 are configured to be slidable on the inner peripheral surface of the accommodating cylinder 77 as the piston 72 moves back and forth.

The cover body 62 covers the vertical supply cylinder portion 14 and the injection cylinder portion 15 from both the upper, rear, and left-right directions.
The trigger portion 63 extends downward while being curved toward the front. The upper end portion of the trigger portion 63 is rotatably connected to the injection cylinder portion 15 around the axis C1 extending in the left-right direction. The central portion of the trigger portion 63 in the vertical direction is connected to the front end portion of the piston body 91 so as to be rotatable around the axis C2 extending in the horizontal direction and movable in the vertical direction. The piston 72 moves back and forth with respect to the cylinder 71 as the trigger portion 63 rotates around the axis C1.

The elastic plate portion 64 is interposed between the injection cylinder portion 15 and the trigger portion 63. The elastic plate portion 64 urges the trigger portion 63 toward the front around the axis C1.

The nozzle portion 11 projects forward from the injection cylinder portion 15. The nozzle portion 11 includes a connecting member 100, a nozzle body 101, and a pressure accumulator valve 102.
The connecting member 100 is formed in the shape of an eclipsed cylinder that opens rearward. The front end portion of the injection cylinder portion 15 is fitted in the peripheral wall portion of the connecting member 100. A communication hole 105 that penetrates the front wall portion in the front-rear direction is formed in the front wall portion of the connecting member 100. The communication hole 105 communicates with the inside of the injection cylinder portion 15 through the front end opening portion 15a of the injection cylinder portion 15.

A mounting cylinder 110 is formed on the front wall portion of the connecting member 100. The mounting cylinder 110 is formed in a tubular shape extending forward from a position eccentric downward with respect to the axis of the injection cylinder portion 15.

The nozzle body 101 is formed in the shape of an eclipsed cylinder that opens rearward. The mounting cylinder 110 described above is fitted in the peripheral wall portion of the nozzle body 101. The space defined between the connecting member 100 and the nozzle body 101 constitutes the accumulator chamber 115.
A nozzle cap 112 having a ejection hole 112a is assembled to the front wall portion of the nozzle body 101.

The accumulator valve 102 is housed in the accumulator chamber 115 described above so as to be movable rearward in a state of being urged forward by the coil spring 120. The pressure accumulator valve 102 is seated on the valve seat portion 121 formed on the front wall portion of the nozzle body 101 and closes the ejection hole 112a. A small-diameter piston portion 102a is formed in the latter half of the accumulator valve 102, and a large-diameter piston portion 102b is formed in the first half of the accumulator valve 102. The pressure accumulator valve 102 applies the pressure of the liquid introduced into the accumulator chamber 115 through the communication hole 105 to both piston portions 102a and 102b. When this pressure exceeds a certain level, the pressure accumulator valve 102 retracts due to the difference in the pressure receiving areas of both piston portions 102a and 102b, and the ejection hole 112a is opened.

The trigger type liquid ejector 1 of the present embodiment includes a lid portion 130 as a blocking means for blocking communication between the outside and the inside of the nozzle portion 11 through the ejection hole 112a. The lid portion 130 is arranged in the nozzle portion 11 and closes the ejection hole 112a so as to be openable and closable from the front. The upper end portion of the lid portion 130 is rotatably attached to the front wall portion of the nozzle body 101 around an axis extending in the left-right direction. The blocking means is not limited to the lid 130, and for example, by rotating the nozzle body 101 relative to the connecting member 100, communication between the outside and the inside of the nozzle body 101 through the ejection hole 112a is blocked. The configuration may be different.

The upside-down adapter 12 is attached to the lower end of the vertical supply cylinder portion 14. In the upside-down adapter 12, the ejection container 1 is inside the container body 2 in either an upright posture (a posture in which the mouth portion 2a is directed upward) or an inverted posture (a posture in which the mouth portion 2a is directed downward). It is possible to inject the liquid of.

The upside-down adapter 12 includes a first mounting member 140 and a second mounting member 141 assembled in the vertical direction, and a partition member 142 for partitioning between the first mounting member 140 and the second mounting member 141. The adapter body of the present embodiment is composed of the first mounting member 140, the second mounting member 141, and the partition member 142.
The first mounting member 140 is formed in a multi-stage tubular shape whose diameter is reduced as it is located above. Specifically, the first mounting member 140 includes a small diameter portion 145, a medium diameter portion 146, and a large diameter portion 147.

The small diameter portion 145 is arranged coaxially with the first axis O1. The upper portion of the small diameter portion 145 is fitted in the upper inner cylinder portion 31. A first flange 150 projecting outward in the radial direction is formed in a portion of the small diameter portion 145 located above the lower end edge.
The medium diameter portion 146 extends downward from the outer peripheral edge of the first flange 150. The medium diameter portion 146 is arranged coaxially with the above-mentioned second axis O2. The medium diameter portion 146 is fitted into the lower inner cylinder portion 32 from below the lower inner cylinder portion 32. As a result, the lower end opening of the lower inner cylinder portion 32 is closed. A second flange 152 projecting outward in the radial direction is formed on the lower end edge of the medium diameter portion 146. The second flange 152 is in close proximity to or in contact with the lower end edge of the lower inner cylinder portion 32 from below the lower inner cylinder portion 32.

The large diameter portion 147 extends downward from the outer peripheral edge of the second flange 152. An inverted introduction port 153 that penetrates the large diameter portion 147 in the radial direction is formed in the front portion of the large diameter portion 147 (front of the second axis O2).

The partition member 142 has a first communication cylinder 160 and a second communication cylinder 161.
The first communication tube 160 is arranged coaxially with the first axis O1. The lower end of the small diameter portion 145 (the portion protruding below the first flange 150) is fitted into the first communication cylinder 160 from above the first communication cylinder 160.
The second communication cylinder 161 is connected to the front of the first communication cylinder 160. The diameter of the second communication cylinder 161 is gradually reduced toward the bottom. In the present embodiment, the space defined between the second communication cylinder 161 and the first mounting member 140 constitutes the valve chamber (second space) 165. The valve chamber 165 communicates with the inside of the container body 2 through the above-mentioned inverted introduction port 153. A ball valve (second switching valve) 164 is housed in the valve chamber 165. The ball valve 164 opens and closes the lower end opening of the second communication cylinder 161 by contacting and separating the ball valve 164 from the lower end opening edge of the second communication cylinder 161.

The second mounting member 141 has a closing portion 170 and a fixing cylinder 171.
The closing portion 170 is formed in a bottomed tubular shape that opens upward. The closing portion 170 is fitted in the large-diameter portion 147 with the partition member 142 sandwiched between them.
The fixed cylinder 171 penetrates the bottom wall portion of the closing portion 170 in the vertical direction at the rear portion of the closing portion 170 (a position coaxial with the first axis O1). A suction pipe 175 is fitted in the lower part of the fixed cylinder 171. The upper end opening (upright introduction port) 171a of the fixed cylinder 171 communicates with the first communication cylinder 160 described above. Therefore, the first communication cylinder 160 communicates with the inside of the container body 2 through the fixed cylinder 171. On the other hand, the second communication cylinder 161 communicates with the inside of the container body 2 through the inverted introduction port 153.

The space defined by the closing portion 170, the fixed cylinder 171 and the second communication cylinder 161 constitutes a connecting flow path 180 connecting the valve chamber 165 and the fixed cylinder 171. The connection flow path 180 communicates with the inside of the fixed cylinder 171 through a slit 182 formed in the fixed cylinder 171. The space from the connection flow path 180 to the small diameter portion 145 via the slit 182 constitutes the first space of the present embodiment.

The accommodation space 40 described above blocks communication between the inside of the upper inner cylinder portion 31 (a portion located below the accommodation space 40) and the communication passage S1 in a state where the ball valve 41 is seated on the valve seat portion 35. On the other hand, in the accommodation space 40, a gap P1 is formed between the inner peripheral surface of the valve seat portion 35 and the ball valve 41 in a state where the ball valve 41 is separated from the valve seat portion 35. As a result, the inside of the upper inner cylinder portion 31 and the connecting passage S1 communicate with each other through the gap P1.

Here, the cross-sectional area of the gap P1 in a state where the ball valve 41 is in contact with the portion of the top wall portion 23a of the upper outer cylinder portion 23 located on the axis O1 is defined as D1. That is, the cross-sectional area D1 is the seating surface (ball valve 41 of the ball valve 41) of the valve seat 35 in the vertical cross-sectional view along the vertical direction in the annular space (gap P1) formed between the ball valve 41 and the valve seat 35. The cross-sectional area of the flow path in the direction orthogonal to the contact surface). In the present embodiment, the cross-sectional area D1 is ^{preferably set to 1.7 mm 2} ≤ D1 ≤ 10.0 mm ^2, and more preferably 3.4 mm ² ≤ D1 ≤ 6.9 mm ^2. .. In the ejector 3 of the present embodiment, the cross-sectional area D1 is 1 when the amount of movement of the ball valve 41 (the amount of movement from the seated state of the valve seat portion 35 to the contact with the top wall portion 23a) is 0.3 mm. .7Mm ^2, and the amount of movement is the cross-sectional area D1 is 10.0 mm ² at 1.5 mm.

On the other hand, the opening area (minimum opening area) of the lower end opening of the valve seat portion 35 is D2. In the present embodiment, the diameter φ of the lower end opening of the valve seat portion 35 is set to 2.8 mm.

In this case, in the present embodiment, the relationship of the cross-sectional area D1 with respect to the opening area D2 satisfies the following conditions.
0.62 ≤ D2 / D1 ≤ 3.62 ... (1)

In the present embodiment, the minimum cross-sectional area D3 of the discharge port 26 is set to ^{5.31 mm 2.} In this case, the relationship of the cross-sectional area D1 with respect to the minimum cross-sectional area D3 satisfies the following conditions.
0.53 ≤ D3 / D1 ≤ 3.1 ... (2)
By setting D3 / D1 to 0.53 or more, the liquid flowing into the injection cylinder portion 15 is compared with the flow rate of the liquid flowing through the gap P1 among the liquids flowing in the connecting passage S1 during the ejection operation in the inverted posture. The flow rate can be increased. As a result, it is possible to reduce the variation in the amount of ejection between the upright posture and the inverted posture.
On the other hand, by setting D3 / D1 to 3.1 or less, the liquid can be efficiently introduced into the cylinder 71. In addition, in order to exert the above-mentioned effect more, it is more preferable that 0.77 ≦ D3 / D1 ≦ 1.5.

Next, the operation of the ejection container 1 will be described. First, the ejection operation in the upright posture will be described. In the upright posture of the ejection container 1, the ball valve 41 is seated on the valve seat portion 35 by its own weight, and the ball valve 164 is seated on the lower end opening edge of the second communication cylinder 161 by its own weight.
In order to eject the liquid in the container body 2 in the upright posture of the ejection container 1, the trigger portion 63 is pulled backward against the urging force of the elastic plate portion 64. Then, the piston 72 retracts as the trigger portion 63 moves backward, so that the inside of the cylinder 71 is pressurized. When the inside of the cylinder 71 is pressurized, the liquid in the cylinder 71 flows into the accommodating space 40 through the connecting passage S1, so that the ball valve 41 is pressed against the valve seat portion 35. As a result, the communication between the inside of the container body 2 and the connecting passage S1 is cut off. Therefore, the liquid in the cylinder 71 is introduced into the injection cylinder portion 15 through the connecting passage S1. When the liquid is introduced into the injection cylinder portion 15, the inside of the injection cylinder portion 15 is pressurized. Then, the insides of the small-diameter piston portion 102a and the large-diameter piston portion 102b in the accumulator valve 102 are pressurized through the communication hole 105.

In the present embodiment, the inner diameter of the large-diameter piston portion 102b is larger than the inner diameter of the small-diameter piston portion 102a. Therefore, a pressure directed toward the rear acts on the pressure accumulating valve 102 due to the difference in the pressure receiving area between the small diameter piston portion 102a and the large diameter piston portion 102b. When the pressures of the small-diameter piston portion 102a and the large-diameter piston portion 102b become equal to or higher than a predetermined pressure, the accumulator valve 102 is retracted against the forward urging force of the coil spring 120. Then, the front end portion of the accumulator valve 102 is separated from the valve seat portion 121, so that the inside of the injection cylinder portion 15 and the ejection hole 112a are communicated with each other, the inside of the accumulator valve 102, and the front end portion and the valve seat portion of the accumulator valve 102. It communicates through the gap between 121 and 121. As a result, the liquid is ejected from the ejection hole 112a.

When the operation of pulling the trigger portion 63 is stopped, the supply of the liquid from the inside of the cylinder 71 into the injection cylinder portion 15 through the connecting passage S1 of the vertical supply cylinder portion 14 is stopped. At this time, the accumulator valve 102 is advanced by the forward urging force of the coil spring 120, and the front end portion of the accumulator valve 102 is seated on the valve seat portion 121 to block the communication between the inside of the injection cylinder portion 15 and the ejection hole 112a. ..

The trigger portion 63 is urged forward by the elastic restoring force of the elastic plate portion 64 and returns to the original position. As the piston 72 advances with the forward movement of the trigger portion 63, a negative pressure is generated in the cylinder 71. At this time, the liquid of the container body 2 flows into the forward inverted adapter 12 through the suction pipe 175 due to the negative pressure generated in the cylinder 71. The liquid that has flowed into the upside-down adapter 12 then circulates in the inner cylinder 22 to push up the ball valve 41. As a result, the ball valve 41 is separated from the valve seat portion 35, and the liquid is introduced into the cylinder 71 through the communication passage S1 and the communication port 81 (supply port 27). This makes it possible to prepare for the next injection.

Subsequently, the ejection operation in the inverted posture will be described. In the inverted posture of the ejection container 1, the ball valve 41 is separated from the valve seat portion 35 by its own weight, and the ball valve 164 is separated from the lower end opening edge of the second communication cylinder 161 by its own weight.
Even in the inverted position of the ejection container 1, the inside of the cylinder 71 is pressurized by pulling the trigger portion 63 rearward. Then, the liquid in the cylinder 71 and the connecting passage S1 is introduced into the injection cylinder portion 15 and the accommodation space 40, respectively. At this time, the gap P1 is set so that the flow resistance when passing through the injection cylinder portion 15 is smaller than the flow resistance when passing through the gap P1 between the ball valve 41 and the valve seat portion 35. Therefore, the liquid is positively introduced into the injection cylinder portion 15 and is injected from the ejection hole 112a as described above.

On the other hand, when the trigger portion 63 returns to the front after the liquid is ejected, a negative pressure is generated in the cylinder 71 as in the above-mentioned upright posture. Then, the liquid that has flowed into the valve chamber 165 through the inverted introduction port 153 flows into the first communication cylinder 160 through the lower end opening of the second communication cylinder 161, the connection flow path 180, and the slit 182. The liquid that has flowed into the first communication cylinder 160 flows through the inner cylinder 22, and then is introduced into the cylinder 71 through the communication passage S1 and the communication port 81 (supply port 27). This makes it possible to prepare for the next injection.

As described above, in the present embodiment, the relationship of the cross-sectional area D1 with respect to the opening area D2 is set to 0.62 ≦ D2 / D1 ≦ 3.62.
According to this configuration, the cross-sectional area D1 can be made relatively small by setting D2 / D1 to 0.62 or more. Therefore, it becomes difficult for the liquid flowing in the connecting passage S1 to pass through the gap P1 between the ball valve 41 and the valve seat portion 35 during the ejection operation in the inverted posture. That is, among the liquids flowing in the connecting passage S1, the flow of the liquid flowing into the injection cylinder portion 15 is dominated as compared with the flow of the liquid passing through the gap P1, so that the flow of the liquid flowing into the injection cylinder portion 15 is made more efficient. Liquid can be introduced. As a result, it is possible to suppress the variation in the amount of ejection between the upright posture and the inverted posture.
On the other hand, by setting D2 / D1 to 3.62 or less, the gap P1 can be set to a size that allows the liquid sucked up from the container body 2 to pass when a negative pressure is generated in the cylinder 71. Therefore, since the piston 72 can be moved smoothly, the liquid can be efficiently introduced into the cylinder 71 and the operability of the trigger portion 63 can be improved.

Moreover, in the present embodiment, the configuration is set to ^{1.7 mm 2} ≤ D1 ≤ 10.0 mm ^2.
According to this configuration, the cross-sectional area D1 can be made relatively small by setting the cross-sectional area D1 to 10.0 mm ^{2 or less.} Therefore, as described above, it is possible to secure the ejection amount in the inverted posture and suppress the variation in the ejection amount between the upright posture and the inverted posture.
On the other hand, by setting the cross-sectional area D1 to 1.7 mm ² or more, the liquid can be efficiently introduced into the cylinder 71 when a negative pressure is generated in the cylinder 71, and the operability of the trigger portion 63 can be improved. can.

In the present embodiment, the ball valve 41 has a configuration in which the specific gravity is larger than that of water.
According to this configuration, the ball valve 41 can be reliably seated on the valve seat portion 35 in the upright posture. As a result, the amount of ejection in the upright posture can be stabilized.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. The configuration can be added, omitted, replaced, or otherwise modified without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.
For example, in the above-described embodiment, the case where the ball valve 41 is used as the first switching valve has been described, but the present invention is not limited to this configuration, and any configuration may be used as long as it is in contact with and separated from the valve seat portion 35 by its own weight.
In the above-described embodiment, the configuration in which the ball valve 41 abuts on the top wall portion 23a of the outer cylinder 21 formed in the shape of an eclipse cylinder has been described, but the inner cylinder 22 may be formed in the shape of an eclipse cylinder.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

1 ... Trigger type liquid ejector 2 ... Container body 2a ... Mouth 10 ... Ejector body 11 ... Nozzle 12 ... Upside down adapter 14 ... Vertical supply cylinder 15 ... Injection cylinder 15a ... Front end opening 21 ... Outer cylinder 22 ... Inner cylinder 23a ... Top wall portion 35 ... Valve seat portion 40 ... Accommodation space 41 ... Ball valve (first switching valve)
63 ... Trigger portion 71 ... Cylinder 72 ... Piston 112a ... Ejection hole 140 ... First mounting member (adapter body)
141 ... Second mounting member (adapter body)
142 ... Partition member (adapter body)
153 ... Inverted introduction port 164 ... Ball valve (second switching valve)
165 ... Valve room (second space)
171a ... Upper end opening (upright introduction port)
S1 ... Communication passage

Claims (3)

The ejector body attached to the container that holds the liquid,
A nozzle portion that is arranged in front of the ejector main body and has an ejection hole for ejecting a liquid, and a nozzle portion.
It is equipped with an upside-down adapter attached to the lower end of the ejector body.
The ejector body is
An eclipse-shaped vertical supply cylinder that extends in the vertical direction and sucks up the liquid in the container.
An injection cylinder portion that is arranged in front of the vertical supply cylinder portion and guides the liquid in the vertical supply cylinder portion to the ejection hole.
A trigger portion arranged in front of the vertical supply cylinder portion so as to be movable backward in a forward urged state,
A piston that is connected to the trigger portion and moves back and forth as the trigger portion moves back and forth,
It has a cylinder that is pressurized and depressurized as the piston moves back and forth.
The vertical supply cylinder portion
An inner cylinder that communicates with the container body and has a valve seat portion that protrudes from the inner peripheral surface.
An outer cylinder that surrounds the inner cylinder and defines a communication passage communicating with the injection cylinder portion and the inner cylinder with the outer peripheral surface of the inner cylinder is provided.
In the inner cylinder, the accommodation space defined by the valve seat portion and the top wall portion of the vertical supply cylinder portion communicates with the communication passage and is detachable from the valve seat portion. The switching valve is housed,
The upside-down adapter is
The adapter body defines a first space that communicates between the container body and the vertical supply cylinder portion through the upright introduction port, and a second space that communicates the container body and the first space through the inverted introduction port. When,
With the ejector main body attached to the container body, the communication between the first space and the second space is cut off when the container body is upright, and the first space and the second space are blocked when the container body is inverted. Equipped with a second switching valve that communicates the space,
When the container body is inverted, the first switching valve and the valve seat are separated from the valve seat portion by their own weight and come into contact with the top wall portion in a vertical cross-sectional view along the vertical direction. Let D1 be the minimum cross-sectional area in the gap between the parts in the direction orthogonal to the valve seat, and D2 be the minimum opening area of the valve seat.
Set to 0.62 ≤ D2 / D1 ≤ 3.62 ,
The outer cylinder is formed with a discharge port that communicates with the injection cylinder portion through the communication passage.
Assuming that the minimum cross-sectional area of the discharge port is D3,
Trigger type liquid ejector set to 0.53 ≦ D3 / D1 ≦ 3.1. The trigger type liquid ejector according to claim 1, which is set to 1.7 mm ² ≤ D1 ≤ 10.0 mm ^2. The trigger type liquid ejector according to claim 1 or 2, wherein the specific gravity of the first switching valve is larger than that of water.

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