JP6789110B2 - Trigger type liquid ejector - Google Patents

Description

The present invention relates to a trigger type liquid ejector.

Conventionally, for example, as shown in Patent Document 1 below, an ejector main body mounted on a container body containing a liquid and an ejection hole arranged on the front side of the ejector main body to inject a liquid are formed. A nozzle portion is provided, and the ejector main body extends in the vertical direction to suck up the liquid in the container, and is arranged in front of the vertical supply cylinder portion to suck the liquid in the vertical supply cylinder portion. It has an injection cylinder part that leads to the ejection hole and a trigger part that is arranged in front of the vertical supply cylinder part so as to be movable rearward in a forward urged state, and the liquid is vertically supplied by moving the trigger part rearward. A trigger type liquid ejector equipped with a trigger mechanism for circulating from the inside of the portion to the ejection hole side through the inside of the injection cylinder portion is known.

Japanese Unexamined Patent Publication No. 2011-177630

However, in the conventional trigger type liquid ejector, when the pressure in the cylinder suddenly rises, for example, when the trigger portion is vigorously pulled backward due to a drop or the like, the nozzle portion is released from the ejector main body. There is a risk of damage due to detachment or the like, or when a large force is applied to the connecting portion between the trigger portion and the piston.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a trigger type liquid ejector capable of reducing a pressure in a cylinder that has risen sharply.

In order to solve the above problems, the trigger type liquid ejector according to the present invention is arranged on the ejector main body mounted on the container body containing the liquid and the front side of the ejector main body to inject the liquid. The ejector main body is provided with a nozzle portion having an ejection hole formed therein, and the ejector main body is arranged in front of the vertical supply cylinder portion and the vertical supply cylinder portion that extends in the vertical direction and sucks the liquid in the container. It has an injection cylinder portion that guides the liquid in the vertical supply cylinder portion to the ejection hole, and a trigger portion that is movably arranged in the front of the vertical supply cylinder portion in a forward urged state. A trigger-type liquid ejector including a trigger mechanism for flowing a liquid from the vertical supply cylinder portion through the injection cylinder portion toward the ejection hole side by moving the trigger portion rearward, wherein the trigger mechanism is provided. Is a piston that is moved back and forth with the back and forth movement of the trigger portion, and the inside is pressurized and depressurized with the back and forth movement of the piston, and is opened forward, and the inside is the vertical supply cylinder. It has a cylinder that communicates with the inside of the portion, the cylinder is arranged inside the cylinder, and includes a tubular piston guide that extends in the front-rear direction. The piston opens rearward and the piston guide is inside the cylinder guide. Is inserted, the tubular piston main body to which the trigger portion is connected and the outer peripheral surface are in contact with the inner peripheral surface of the cylinder over the entire circumference, and the inner peripheral surface is entirely on the outer peripheral surface of the piston guide. The ejector main body includes a sliding cylinder portion that abuts over the circumference, and allows the liquid to flow from the inside of the container into the injection cylinder portion and the cylinder through the vertical supply cylinder portion. A check valve for blocking the flow of liquid from the inside of the injection cylinder and the inside of the cylinder to the inside of the container through the vertical supply cylinder portion, and a collection passage for communicating the inside of the piston guide and the inside of the container are provided. The piston guide is formed with a communication opening that communicates the inside of the piston body and the inside of the piston guide, and a part of the piston guide in the circumferential direction can be elastically deformed inward in the radial direction. It is characterized in that it is formed in.

According to the present invention, when the trigger portion is moved backward and the piston is moved backward with respect to the cylinder, the outer peripheral surface of the sliding cylinder portion of the piston is the inner peripheral surface of the cylinder, and the inner peripheral surface is the piston guide. The liquid between the piston and the cylinder is pressurized by moving backward in contact with the outer peripheral surface of the piston. At this time, the check valve blocks the inflow of liquid from the inside of the injection cylinder and the inside of the piston into the container. Therefore, this pressurized liquid flows from the cylinder through the vertical supply cylinder into the injection cylinder, reaches the nozzle from the injection cylinder, and is injected from the ejection hole.

Since the piston guide is formed so as to be elastically deformable toward the inside in the radial direction, for example, the trigger portion is vigorously pulled backward, and the pressure in the cylinder, the injection cylinder portion, the nozzle portion, etc. is applied. When it rises sharply, the liquid in the cylinder passes between the outer peripheral surface of the piston guide and the inner peripheral surface of the sliding cylinder while elastically deforming the outer peripheral surface of the piston guide inward in the radial direction, and enters the piston body. Inflow to. Then, this liquid flows into the piston guide through the communication opening of the piston guide and is returned to the inside of the container through the collection passage. As a result, the pressure in the cylinder that has risen sharply can be reduced.

Also, the pressure of the liquid in the cylinder piston guide is added, a portion of the piston guide of elastically deformable formed circumferentially easily applied with force is concentrated, a portion of the circumferential direction It can be easily deformed.

Further, the piston guide may be formed to be thin in the radial direction and elastically deformable.
In this case, the piston guide can be easily elastically deformable as compared with a configuration in which the piston guide is formed by combining a plurality of materials, for example.

Further, the ejector main body may be provided with a blocking means for blocking communication between the outside through the ejection hole and the inside of the nozzle portion.
In this case, when the communication between the outside and the inside of the nozzle portion through the ejection hole is blocked by the blocking means, for example, when the trigger portion is vigorously pulled backward, the pressure inside the cylinder increases in particular. Despite the ease, the pressure in the cylinder that has risen in this way can be reduced.

According to the present invention, it is possible to reduce the pressure in the cylinder that has risen sharply.

It is a vertical sectional view along the front-rear direction of the trigger type liquid ejector which concerns on one Embodiment of this invention. It is sectional drawing which is orthogonal to the cylinder axis in the piston guide of this invention.

Hereinafter, the trigger type liquid ejector 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. In each drawing used in the following description, the scale is appropriately changed in order to make each member a recognizable size.

As shown in FIG. 1, the trigger type liquid ejector 1 has an ejector main body 2 mounted on a container body A containing a liquid and an ejection hole 4 arranged in the ejector main body 2 to inject a liquid. It is provided with the formed nozzle portion 3. Further, the ejector main body 2 includes a vertical supply cylinder portion 10 that sucks up the liquid in the container body A, and an injection cylinder portion 11 that guides the liquid in the vertical supply cylinder portion 10 to the ejection hole 4.

Here, in the following description, the direction along the central axis O1 of the vertical supply cylinder portion 10 is referred to as the vertical direction, the container body A side is referred to as the lower side, and the opposite side is referred to as the upper side along the vertical direction. Further, in a plan view seen from the vertical direction, the direction orthogonal to the central axis O1 is referred to as the axial radial direction, one of the axial radial directions is referred to as the front-rear direction, and is orthogonal to both the vertical direction and the front-rear direction. The direction is called the left-right direction. Further, in the front-rear direction, the direction in which the injection cylinder portion 11 extends from the vertical supply cylinder portion 10 is referred to as the front side, and the opposite direction is referred to as the rear side.

The vertical supply cylinder portion 10 includes an outer cylinder 12 and an inner cylinder 13 fitted in the outer cylinder 12.
The outer cylinder 12 has a large diameter portion 12a, a small diameter portion 12b arranged above the large diameter portion 12a and reduced in diameter from the large diameter portion 12a, an upper end portion of the large diameter portion 12a, and a lower end portion of the small diameter portion 12b. An annular connecting portion 12c for connecting the portions and a top wall portion 12d for closing the upper end portion of the small diameter portion 12b are provided.
The top wall portion 12d covers the upper part of the check valve 36, which will be described later. The lower end of the small diameter portion 12b projects downward from the annular connecting portion 12c.

The inner cylinder 13 includes a large diameter portion 13a to which the large diameter portion 12a of the outer cylinder 12 is fitted, and a small diameter portion 13b that is arranged above the large diameter portion 13a and has a smaller diameter than the large diameter portion 13a. A flange portion 13c for connecting the upper end portion of the large diameter portion 13a and the lower end portion of the small diameter portion 13b is provided, and the diameter is reduced from the lower side to the upper side in a two-stage tubular shape. A reduced diameter portion 13g having a smaller outer diameter than the small diameter portion 13b is formed on the upper portion of the small diameter portion 13b. A notch 13f that opens upward and forward is formed in the front portion of the upper end portion of the reduced diameter portion 13g.

In the small diameter portion 13b of the inner cylinder 13, the upper portion of the pipe 15 which is arranged in the container body A and whose lower end opening is located at the bottom portion of the container body A (not shown) is fitted. The inside of the small diameter portion 13b is a supply passage L1 for supplying the liquid in the container body A into the ejector main body 2.
The flange portion 13c of the inner cylinder 13 is located below the annular connecting portion 12c of the outer cylinder 12 with a gap S1 secured between the flange portion 13c of the outer cylinder 12 and the annular connecting portion 12c of the outer cylinder 12.

In the large-diameter portion 13a of the inner cylinder 13, an annular flange portion 13d protruding outward in the axial direction thereof is formed in a portion of the outer cylinder 12 protruding downward from the large-diameter portion 12a. The collar portion 13d is arranged in the upper end portion of the mounting cap 14 mounted (for example, screwed) on the mouth portion A1 of the container body A, and rotatably locks the upper end portion of the mounting cap 14 around its axis. The collar portion 13d is sandwiched in the vertical direction by the mounting cap 14 and the upper end opening edge of the mouth portion A1 of the container body A.
The central axis O1 of the vertical supply cylinder portion 10 composed of the outer cylinder 12 and the inner cylinder 13 is eccentric to the rear side with respect to the container shaft of the container body A.

An annular tapered cylinder portion 35 projecting inward is formed on a portion of the inner peripheral surface of the inner cylinder 13 located above the upper end of the pipe 15.
The diameter of the tapered cylinder portion 35 is gradually reduced toward the bottom. Inside the tapered cylinder portion 35, a spherical check valve 36 that is seated on the inner peripheral surface of the tapered cylinder portion 35 so as to be detachable is provided.
By separating the check valve 36 from the inner peripheral surface of the tapered cylinder portion 35, the liquid flows from the container body A into the injection cylinder portion 11 and into the cylinder 53 described later through the vertical supply cylinder portion 10. Tolerate. Further, when the check valve 36 is seated on the inner peripheral surface of the tapered cylinder portion 35, the liquid flows from the inside of the injection cylinder portion 11 and the inside of the cylinder 53 into the container body A through the inside of the vertical supply cylinder portion 10. To shut off. In the illustrated example, the check valve 36 has a space on the downstream side located above the tapered cylinder portion 35 and a space on the upstream side located below the tapered cylinder portion 35 in the supply passage L1. Communicate and shut off.

As shown in FIG. 1, a cylinder portion 40 projecting forward is formed integrally with the outer cylinder 12 in a portion located below the injection cylinder portion 11.
The cylinder portion 40 is open toward the front and is integrally formed with the annular connecting portion 12c of the outer cylinder 12.

The injection cylinder portion 11 protrudes forward from the vertical supply cylinder portion 10, and the rear end portion is connected to the front side of the upper end portion of the vertical supply cylinder portion 10. The inside of the injection cylinder portion 11 is formed in the outer cylinder 12, and communicates with the inside of the vertical supply cylinder portion 10 through a discharge hole 16 that opens toward the outer peripheral surface of the reduced diameter portion 13 g of the inner cylinder 13. A horizontal plate-shaped upper plate member 84 is attached to the upper surface of the injection cylinder portion 11.

The ejector main body 2 has a trigger portion 51 arranged in front of the vertical supply cylinder portion 10 so as to be movable rearward in a forward urged state, and the liquid is vertically supplied by the movement of the trigger portion 51 to the rear. It is provided with a trigger mechanism 50 that circulates from the inside of the portion 10 through the inside of the injection cylinder portion 11 toward the ejection hole 4 side.
The trigger mechanism 50 includes a piston 52 that is moved back and forth with the back and forth movement of the trigger portion 51, a cylinder 53 that is internally pressurized and depressurized by the back and forth movement of the piston 52, and is opened forward. have.

In the following description, the central axis of the cylinder 53 is referred to as a cylinder shaft O2. Further, the direction orthogonal to the cylinder shaft O2 when viewed from the front-rear direction is referred to as the cylinder radial direction (radial direction), and the direction rotating around the cylinder shaft O2 is referred to as the cylinder circumferential direction.
The trigger mechanism 50 further includes an elastic plate portion 54 that biases the trigger portion 51 forward, and a cover body 55 that covers the entire vertical supply cylinder portion 10 and the injection cylinder portion 11 from at least above and in the left-right direction. There is.

The cylinder 53 projects forward from the vertical supply cylinder portion 10. The cylinder 53 is formed with a communication hole 66 that communicates the inside of the cylinder 53 with the inside of the vertical supply cylinder portion 10. The communication hole 66 is formed in the rear wall portion 61 of the cylinder 53.
The cylinder 53 includes an outer cylinder portion 60 that opens toward the front, a rear wall portion 61 that closes the rear opening of the outer cylinder portion 60, and a tubular piston guide 62 that is arranged inside the cylinder 53 and extends in the front-rear direction. And have.

The outer cylinder portion 60 is fitted inside the cylinder portion 40. The inner peripheral surface of the cylinder portion 40 and the outer peripheral surface of the outer cylinder portion 60 are in close contact with each other at both ends in the front-rear direction. On the other hand, an annular gap S2 is provided in the intermediate portion between the inner peripheral surface of the cylinder portion 40 and the outer peripheral surface of the outer cylinder portion 60, which is located between both ends in the front-rear direction. ..

The outer cylinder portion 60 is formed with a first ventilation hole 63 that communicates the inside of the outer cylinder portion 60 with the gap S2. The annular connecting portion 12c of the outer cylinder 12 communicates with the gap S2 and the gap S1 defined between the annular connecting portion 12c of the outer cylinder 12 and the flange portion 13c of the inner cylinder 13. The pores 64 are formed. Further, the flange portion 13c of the inner cylinder 13 is formed with a third ventilation hole 65 that communicates the gap S1 with the inside of the mounting cap 14.

The piston guide 62 is projected forward from the central portion of the rear wall portion 61 in the cylinder radial direction, and the front end and the rear end are open. In the rear end opening, the rear end of the cylinder portion 40 is formed. It is a wall, and a fitting cylinder portion 41 projecting forward from the small diameter portion 12b of the outer cylinder 12 is fitted. The front end opening of the piston guide 62 is a communication opening 62a that communicates the inside of the piston main body 72 and the inside of the piston guide 62, which will be described later.
An annular recess 62b is formed at the rear end of the outer peripheral surface of the piston guide 62.

The communication hole 66 penetrates the rear wall portion 61 of the cylinder 53, which is located above the piston guide 62, in the front-rear direction. In the illustrated example, a protruding cylinder portion 67 projecting rearward is formed at the opening peripheral edge portion of the communication hole 66 in the rear wall portion 61, and the protruding cylinder portion 67 is formed on the small diameter portion 12b of the outer cylinder 12. It is fitted in the formed through hole. This through hole is opened toward the outer peripheral surface of the reduced diameter portion 13 g of the inner cylinder 13.

A connecting passage L2 is formed between the inner peripheral surface of the outer cylinder 12 and the outer peripheral surface of the reduced diameter portion 13g of the inner cylinder 13 of the vertical supply cylinder portion 10. The connecting passage L2 communicates with the inside of the injection cylinder portion 11 through the discharge hole 16 formed in the outer cylinder 12. Further, the connecting passage L2 communicates with the supply passage L1 in the small diameter portion 13b through the notch portion 13f.

Further, among the inner peripheral surface of the small diameter portion 12b of the outer cylinder 12 and the outer peripheral surface of the small diameter portion 13b of the inner cylinder 13 in the vertical supply cylinder portion 10, the front portion is inside the fitting cylinder portion 41. And the inside of the third ventilation hole 65 of the inner cylinder 13, and the connection passage 42 communicating with the inside of the third ventilation hole 65 is formed. The fitting cylinder portion 41, the connecting passage 42, and the third ventilation hole 65 communicate with each other in the piston guide 62 and the container body A, and are different from the supply passage L1 and the connecting passage L2. It constitutes 43.
The recovery passage 43 is not limited to such an embodiment, and may be formed in a portion different from the vertical supply cylinder portion 10, such as being formed in the cylinder 53.

The piston 52 slides so as to project outward in the cylinder radial direction from the piston body 72, which opens rearward and into which the piston guide 62 is inserted, and the rear end of the piston body 72. It is provided with a cylinder portion 73. The piston 52 is arranged coaxially with the cylinder shaft O2, and supplies the liquid in the cylinder 53 into the vertical supply cylinder portion 10 and the injection cylinder portion 11.

The inner peripheral surface of the piston body 72 faces the outer peripheral surface of the piston guide 62 with a gap in the cylinder radial direction. A columnar connecting portion 70 connected to the trigger portion 51 is formed at the front end portion of the piston main body portion 72. The connecting portion 70 has a smaller diameter than the piston main body portion 72.
The sliding cylinder portion 73 is slidably fitted to the piston guide 62 in the front-rear direction. As a result, a storage chamber 53a is formed in the cylinder 53 located on the rear side of the sliding cylinder portion 73, through which the liquid flows from the connecting passage L2 in the vertical supply cylinder portion 10 through the communication hole 66. ..

The sliding cylinder portion 73 is formed in a tapered shape in which the diameter gradually increases from the central portion in the front-rear direction toward the front and the rear. The outer peripheral surface of the sliding cylinder portion 73 is in contact with the inner peripheral surface of the cylinder 53 over the entire circumference, and the inner peripheral surface is in contact with the outer peripheral surface of the piston guide 62 over the entire circumference.
Of the sliding cylinder portions 73, lip portions 73a located at both ends in the front-rear direction are in contact with the inner peripheral surface of the outer cylinder portion 60 of the cylinder 53.

The connecting portion 70 of the piston 52 is connected to the trigger portion 51 via a connecting shaft 86 described later. As a result, the piston 52 is urged forward together with the trigger portion 51 by the urging force of the elastic plate portion 54, and at the same time, moves rearward as the trigger portion 51 swings backward and is pushed into the cylinder 53. Is done.

Further, when the trigger portion 51 is in the most forward swing position (most forward position), the sliding cylinder portion 73 of the piston 52 closes the first ventilation hole 63. Then, when the piston 52 moves rearward by a predetermined amount due to the rearward swing of the trigger portion 51, the sliding cylinder portion 73 opens the first ventilation hole 63. As a result, the inside of the container body A communicates with the outside through the third ventilation hole 65, the second ventilation hole 64, and the first ventilation hole 63.

By the way, when the trigger portion 51 is operated for the first time, the pressure accumulator valve 124, which will be described later, is applied with air pressure toward the rear to retract the accumulator valve 124 and open the ejection hole 4, and the storage chamber. It is necessary to exhaust the air in 53a. However, when the pressure of the rearward air acting on the accumulator valve 124 falls below a predetermined pressure, the accumulator valve 124 advances due to the forward urging force of the coil spring 225 described later, the ejection hole 4 is closed, and the air is discharged. Stops. Therefore, air tends to remain in the storage chamber 53a. Therefore, in the present embodiment, the inside of the storage chamber 53a and the inside of the container body A are communicated with each other as described below, so that the air remaining in the storage chamber 53a can be discharged into the container body A.

That is, when the trigger portion 51 is located at the rearmost swing position and the piston 52 is moved to the rearmost moving position, the rear end portion of the inner peripheral surface of the sliding cylinder portion 73 is the recessed portion 62b of the piston guide 62. It is located at the same position in the front-back direction. At this time, the inside of the storage chamber 53a and the inside of the piston main body 72 communicate with each other through the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62.
As a result, the inside of the storage chamber 53a is between the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62, the inside of the piston main body 72, the communication opening 62a, the inside of the piston guide 62, and the recovery passage 43. It communicates with the inside of the container body A through. As described above, when the trigger portion 51 is operated for the first time, the air in the storage chamber 53a can be efficiently discharged into the container body A.

Further, when the storage chamber 53a is filled with the contents, a residual pressure is generated in the storage chamber 53a when the trigger portion 51 is swung to the rearmost swing position, and the residual pressure ejects the trigger portion 51. “Dripping” may occur in which the contents are suddenly discharged from the hole 4. According to the present embodiment, even if a residual pressure is generated in the storage chamber 53a, the residual pressure is applied between the inner peripheral surface of the piston main body 72 and the outer peripheral surface of the piston guide 62, and in the piston main body 72. Since the material can be collected into the container body A through the communication opening 62a, the piston guide 62, and the collection passage 43, it is possible to suppress dripping from the ejection hole 4 due to residual pressure and improve liquid drainage.

The trigger portion 51 includes a main plate member 80 having a front surface that is concavely curved toward the rear when viewed from the left and right directions, and a pair of side plate members 81 that stand up from the left and right side edges of the main plate member 80 toward the rear. And have.

At the upper ends of the pair of side plate members 81, a pair of connecting plates 82 extending upward to the side of the injection cylinder portion 11 and sandwiching the injection cylinder portion 11 from the left-right direction are formed. A rotating shaft portion 83 is projected from the pair of connecting plates 82 toward the outside in the left-right direction. The rotating shaft portion 83 is rotatably supported by a bearing portion provided on the upper plate member 84 that covers the upper part of the injection cylinder portion 11. As a result, the trigger portion 51 can swing in the front-rear direction around the rotation shaft portion 83.

The trigger portion 51 is formed with an opening 51a that penetrates the main plate member 80 in the front-rear direction, and a connecting cylinder 85 is formed so as to extend rearward from the peripheral edge of the opening 51a.
A pair of connecting shafts 86 protruding in the left-right direction toward the inside of the connecting cylinder 85 are formed on a portion of the inner peripheral surface of the connecting cylinder 85 located on the rear side. These connecting shafts 86 are inserted into connecting holes formed in the connecting portion 70 of the piston 52. As a result, the trigger portion 51 and the piston 52 are connected to each other.

The connecting portion 70 of the piston 52 is rotatably connected to the connecting shaft 86 around the axis thereof, and is movably connected to the connecting shaft 86 by a predetermined amount in the vertical direction. As a result, the piston 52 can move back and forth as the trigger portion 51 swings in the front-rear direction.

On both the left and right sides of the upper plate member 84, the elastic plate portions 54, which are formed in an arc shape that is convex forward when viewed from the left and right directions and extends below the injection cylinder portion 11, are integrally formed. There is. The elastic plate portion 54 is formed in an arc shape concentric with each other when viewed from the left-right direction, and includes a pair of leaf springs arranged in the front-rear direction.

Of the pair of leaf springs, the leaf spring located on the front side is the main leaf spring 54a, and the leaf spring located on the rear side is the sub leaf spring 54b.
The lower ends of the main leaf spring 54a and the sub leaf spring 54b are integrally connected via an arcuate folded-back portion 54c. A locking piece 54d is projected downward from the folded-back portion 54c, and the locking piece 54d is inserted into and engaged with the pocket portion 81a formed in the side plate member 81 of the trigger portion 51 from above. ing.
As a result, the elastic plate portion 54 urges the trigger portion 51 forward via the locking piece 54d and the pocket portion 81a.

The upper end of the main plate member 80 of the trigger portion 51 is in contact with the contact portion 20g of the connecting member 20, which will be described later, from behind by the urging of the elastic plate portion 54. As a result, the trigger portion 51 is positioned at the most forward swing position.
When the trigger portion 51 is pulled backward from the most forward swing position, the elastic plate portion 54 is elastically deformed so as to move the folded-back portion 54c rearward via the locking piece 54d. At this time, the elastic plate portion 54 is elastically deformed by the sub-leaf spring 54b more than the main leaf spring 54a.

Even when the trigger portion 51 is pulled backward, the locking piece 54d is pulled out from the pocket portion 81a upward until the trigger portion 51 reaches the rearmost swing position (rearmost moving position). The engaged state with the pocket portion 81a is maintained.

The connecting member 20 is located on the front side of the front end opening of the injection cylinder portion 11, and extends rearward from the facing plate portion 21 arranged to face the front end opening and the injection cylinder portion 21. A first tubular portion 22 fitted to the 11 and a second tubular portion 23 extending forward from the facing plate portion 21 are provided.
The second cylinder portion 23 is arranged at a position eccentric downward with respect to the central axis of the injection cylinder portion 11. An injection hole 25 is formed in a portion of the facing plate portion 21 located inside the second tubular portion 23. The injection hole 25 penetrates the facing plate portion 21 in the front-rear direction. Further, inside the second tubular portion 23, a communication passage 237 for communicating the injection hole 25 and the ejection hole 4 is formed. As a result, the inside of the second cylinder portion 23 communicates with the inside of the injection cylinder portion 11 through the communication passage 237 and the injection hole 25.

The nozzle portion 3 is arranged on the front side of the ejector main body 2, and includes a nozzle body 220 in which an ejection hole 4 is formed. The nozzle body 220 is formed with an outer fitting cylinder portion 221 extending in the front-rear direction and outerly fitted to the second cylinder portion 23, closing the front end of the outer fitting cylinder portion 221 and forming a ejection hole 4 in the center. A nozzle wall portion 222, a pressure accumulator chamber 223 defined behind the nozzle wall portion 222, a pressure accumulator valve 124 housed in the pressure accumulator chamber 223, and a metal coil spring 225 are provided. The nozzle body 220 is connected to the injection cylinder portion 11 via the connecting member 20 because the outer fitting cylinder portion 221 is externally fitted to the second cylinder portion 23 of the connecting member 20.

The accumulator valve 124 is urged forward by the coil spring 225 and seats on the valve seat portion 224 formed on the rear surface of the nozzle wall portion 222 to close the ejection hole 4. A small-diameter piston portion 124a is formed in the latter half of the accumulator valve 124, and a large-diameter piston portion 124b is formed in the first half of the accumulator valve 124. The pressure accumulator valve 124 applies the pressure of the liquid introduced from the injection hole 25 and the communication passage 237 to both piston portions 124a and 124b. When this pressure exceeds a certain level, the pressure accumulator valve 124 retracts due to the difference in the pressure receiving areas of both piston portions 124a and 124b, and the ejection hole 4 is opened.

Then, in the present embodiment, the piston guide 62 is formed so as to be elastically deformable toward the inside in the cylinder radial direction. A part of the piston guide 62 in the circumferential direction is formed to be thin in the cylinder radial direction, so that the piston guide 62 is elastically deformable toward the inside in the cylinder radial direction.
As shown in FIG. 2, the outer diameter of the piston guide 62 is the same over the entire circumference. In the cross-sectional view seen from the front-rear direction, a thin portion 91 whose inner peripheral surface projects outward in the cylinder radial direction is formed on a portion of the peripheral wall of the piston guide 62 located above the cylinder shaft O2. Has been done. The outer peripheral surface of the thin portion 91 coincides with the outer peripheral surface of the piston guide 62. In the illustrated example, one thin-walled portion 91 is formed on the peripheral wall of the piston guide 62.

Further, a non-formed portion 92 having a thickness in the cylinder radial direction larger than that of the thin-walled portion 91 is formed in a portion of the peripheral wall of the piston guide 62 located on the opposite side of the thin-walled portion 91 that sandwiches the cylinder shaft O2 in the cylinder radial direction. Has been done. The outer peripheral surface of the non-formed portion 92 coincides with the outer peripheral surface of the piston guide 62, and the inner peripheral surface of the non-formed portion 92 has a concentric circular shape with the outer peripheral surface of the non-formed portion 92.
The peripheral ends of the thin-walled portion 91 and the non-formed portion 92 are connected to each other by a connecting portion 93. The thickness of the connecting portion 93 gradually increases in the cylinder radial direction from the peripheral end portion of the thin-walled portion 91 toward the peripheral end portion of the non-formed portion 92.

The thin-walled portion 91 is formed from at least the front end portion of the piston guide 62 to the portion where the rear end portion of the sliding cylinder portion 73 of the piston 52 located at the frontmost moving position abuts. In the illustrated example, the thin-walled portion 91 is formed from the front end portion of the piston guide 62 to the connecting portion with the recessed portion 62b.

The thin portion 91 is formed in a range in which the central angle of the peripheral wall of the piston guide 62 centered on the cylinder shaft O2 is narrower than 180 °. The central portion of the thin portion 91 in the circumferential direction is located at the upper end of the piston guide 62. The size of the thin portion 91 in the cylinder radial direction is the same over the entire circumferential direction.
The inner peripheral surface of the peripheral end portion of the thin-walled portion 91 is formed in a curved surface shape that protrudes outward in the radial direction of the cylinder. The inner peripheral surface of the connecting portion 93 is formed flat in the cross-sectional view. The outer peripheral surface of the connecting portion 93 coincides with the outer peripheral surface of the piston guide 62. The non-formed portion 92 is located below the cylinder shaft O2, and is formed in a range in which the central angle centered on the cylinder shaft O2 is narrower than 180 °.

Further, in the present embodiment, the trigger type liquid ejector 1 is provided with a lid portion 226 as a blocking means for blocking communication between the outside and the inside of the nozzle portion 3 through the ejection hole 4. The lid portion 226 is arranged in the nozzle portion 3 and closes the ejection hole 4 so as to be openable and closable from the front. The upper end portion of the lid portion 226 is rotatably attached to the nozzle wall portion 222 around an opening / closing shaft 176 extending in the left-right direction. The lid portion 226 opens the ejection hole 4 by rotating toward the front around the opening / closing shaft 176.
The blocking means is not limited to the lid portion 226, and for example, by switching the relative positions of the connecting member 20 and the nozzle portion 3 in the circumferential direction, communication between the outside and the inside of the nozzle portion 3 through the ejection hole 4 is blocked. It may be configured to do so.

Next, the operation of the trigger type liquid ejector 1 configured as described above will be described.
When the trigger portion 51 is pulled backward against the urging force of the elastic plate portion 54, the piston 52 retracts as the trigger portion 51 moves backward, so that the liquid in the storage chamber 53a of the cylinder 53 is in the communication hole 66. It is introduced into the injection cylinder portion 11 through the inside and the communication passage L2. At this time, the check valve 36 is closed, the communication between the inside of the injection cylinder portion 11 and the inside of the container body A through the supply passage L1 is cut off, the inside of the injection cylinder portion 11 is pressurized, and the injection hole 25 is pressed. The insides of the small-diameter piston portion 124a and the large-diameter piston portion 124b of the accumulator valve 124 are also pressurized.

At this time, the inner diameter of the large-diameter piston portion 124b is larger than the inner diameter of the small-diameter piston portion 124a. The pressure toward the rear acts. When this pressure becomes equal to or higher than a predetermined pressure, the accumulator valve 124 is retracted against the forward urging force of the coil spring 225, and the front end portion of the accumulator valve 124 is separated from the valve seat portion 224, whereby the injection cylinder portion 11 The inside of the injection hole 25 and the ejection hole 4 communicate with each other through the injection hole 25, the communication passage 237, the inside of the accumulator valve 124, and the gap between the front end portion of the accumulator valve 124 and the valve seat portion 224, and the liquid is discharged from the ejection hole 4. It is sprayed.

When the operation of pulling the trigger portion 51 is stopped, the supply of the liquid from the storage chamber 53a into the injection cylinder portion 11 through the connecting passage L2 of the vertical supply cylinder portion 10 is stopped. At this time, the accumulator valve 124 is advanced by the forward urging force of the coil spring 225, and the front end portion of the accumulator valve 124 is seated on the valve seat portion 224 and closes the pressure accumulator valve 124. Cut off communication.
Then, the trigger portion 51 is urged forward by the elastic restoring force of the elastic plate portion 54 and returns to the original position, so that the piston 52 advances accordingly. Therefore, a negative pressure is generated in the storage chamber 53a, and the negative pressure allows the liquid in the container body A to be sucked up into the supply passage L1 of the vertical supply cylinder portion 10 through the pipe 15.
Then, the newly sucked liquid pushes up the check valve 36 to open the valve, and is introduced into the storage chamber 53a through the connecting passage L2. This makes it possible to prepare for the next injection.

As described above, according to the trigger type liquid ejector 1 according to the present embodiment, the piston guide 62 is formed so as to be elastically deformable toward the inside in the cylinder radial direction, so that, for example, the trigger portion 51 is rearward. When the pressure in the cylinder 53, the injection cylinder 11 and the nozzle 3 located downstream of the check valve 36 rises sharply, the liquid in the cylinder 53 becomes the piston. While deforming the outer peripheral surface of the guide 62 inward in the cylinder radial direction, it passes between the outer peripheral surface of the piston guide 62 and the inner peripheral surface of the sliding cylinder portion 73, and flows into the piston main body portion 72. Then, this liquid flows into the piston guide 62 through the communication opening 62a of the piston guide 62, and is returned to the container body A through the recovery passage 43. As a result, the pressure in the cylinder 53 that has risen sharply can be reduced.

Further, since a part of the piston guide 62 in the circumferential direction is formed so as to be elastically deformable toward the inside in the cylinder radial direction, when the pressure of the liquid in the cylinder 53 is applied to the piston guide 62, the piston guide 62 The force is easily concentrated on a part of the circumferential direction formed so as to be elastically deformable, and the part of the circumferential direction can be easily deformed.
Further, since the thin-walled portion 91 thus elastically deformable is formed at one location on the peripheral wall of the piston guide 62, the pressure of the liquid in the cylinder 53 is concentrated without being dispersed, and the thin-walled portion 91 is concentrated. It becomes easy to participate in, and it can be elastically deformed more easily.
Further, since the piston guide 62 is formed to be thin in the cylinder radial direction and elastically deformable, the piston guide 62 is compared with a configuration in which the piston guide 62 is formed by combining a plurality of materials, for example. Can be easily elastically deformable.

Further, since the trigger type liquid ejector 1 is provided with a lid portion 226 for blocking communication between the outside through the ejection hole 4 and the inside of the nozzle portion 3, the outside and the nozzle portion through the ejection hole 4 by the blocking means are provided. When the communication with the inside of the cylinder 3 is cut off, for example, when the trigger portion 51 is pulled vigorously toward the rear, the pressure inside the cylinder 53 tends to increase, but the pressure rises in this way. The pressure in the cylinder 53 can be reduced.

The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention.

For example, in each of the above embodiments, a part of the piston guide 62 in the circumferential direction is formed so as to be elastically deformable toward the inside in the cylinder radial direction, but the present invention is not limited to this aspect. .. For example, a plurality of thin-walled portions 91 may be arranged on the peripheral wall of the piston guide 62 at intervals in the circumferential direction, or the entire circumferential direction of the piston guide 62 may be formed so as to be elastically deformable.

Further, in the above embodiment, the piston guide 62 is formed to be thin in the cylinder radial direction and elastically deformable, but the present invention is not limited to this aspect. For example, the peripheral wall of the piston guide 62 may be formed by combining a plurality of materials having different materials, and may be formed so as to be elastically deformable in a portion of a material having a low elastic modulus.

Further, in the above embodiment, the trigger type liquid ejector 1 is provided with a lid portion 226 as a blocking means for blocking communication between the outside and the inside of the nozzle portion 3 through the ejection hole 4. It is not limited to such an aspect. The trigger type liquid ejector 1 does not have to be provided with a blocking means.
Further, in the above embodiment, the configuration in which the annular recessed portion 62b is formed at the rear end portion on the outer peripheral surface of the piston guide 62 is shown, but the present invention is not limited to such an embodiment. The recessed portion 62b may not be formed on the outer peripheral surface of the piston guide 62. In such a case, the thin-walled portion 91 may be formed over the entire area of the piston guide 62 in the front-rear direction.

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 Ejector body 4 Ejection hole 3 Nozzle part 10 Vertical supply cylinder part 11 Injection cylinder part 36 Check valve
43 Recovery passage 50 Trigger mechanism 51 Trigger part 52 Piston 53 Cylinder 62 Piston guide 62a Communication opening 72 Piston body part 73 Sliding cylinder part 226 Lid part (blocking means)
A container body

Claims (3)

The ejector body attached to the container containing the liquid,
It is provided with a nozzle portion which is arranged on the front side of the ejector main body and has an ejection hole for ejecting a liquid.
The ejector main body extends in the vertical direction and has a vertical supply cylinder portion that sucks up the liquid in the container.
An injection cylinder portion that is disposed 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 is provided in front of the vertical supply cylinder portion so as to be movable rearward in a forward urged state, and the liquid is discharged from the inside of the vertical supply cylinder portion to the inside of the injection cylinder portion by moving the trigger portion rearward. It is a trigger type liquid ejector provided with a trigger mechanism for circulating toward the ejection hole side through the ejection hole.
The trigger mechanism has a piston that is moved back and forth with the back and forth movement of the trigger portion, and the inside is pressurized and depressurized with the back and forth movement of the piston, and the inside is opened toward the front and the inside is said. It has a cylinder that communicates with the inside of the vertical supply cylinder,
The cylinder is arranged inside the cylinder and includes a tubular piston guide extending in the front-rear direction.
The piston opens rearward, the piston guide is inserted into the piston, and a tubular piston main body to which the trigger portion is connected and the piston main body.
A sliding cylinder portion in which the outer peripheral surface abuts on the inner peripheral surface of the cylinder over the entire circumference and the inner peripheral surface abuts on the outer peripheral surface of the piston guide over the entire circumference is provided.
The ejector main body allows liquid to flow from the container body into the injection cylinder and the cylinder through the vertical supply cylinder, and passes through the vertical supply cylinder to the injection cylinder and the cylinder. A check valve that blocks the flow of liquid from the inside into the container,
A collection passage that communicates the inside of the piston guide and the inside of the container is provided.
The piston guide is formed with a communication opening that communicates the inside of the piston body and the inside of the piston guide.
The piston guide is a trigger type liquid ejector, characterized in that a part of the piston guide is elastically deformable toward the inside in the radial direction. The trigger type liquid ejector according to claim 1, wherein the piston guide is formed to be thin in the radial direction and elastically deformable. The trigger-type liquid ejector according to claim 1 or 2 , further comprising a blocking means for blocking communication between the outside through the ejection hole and the inside of the nozzle portion.

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