JP2008296144A - Trigger-type liquid jet tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trigger-type liquid jet tool which can improve sealability between the forward end part of a valve body and a valve seat plate. <P>SOLUTION: This trigger-type liquid jet tool 10 is equipped with a jet tool body 11 and a nozzle 20 arranged at the forward end of the jet tool body 11. In addition, either a valve seat part 25 of the nozzle 20 or a nozzle tip 28 is formed integrally with a connecting cylinder part 21, while the other is of a discrete component type. The inside diameter of the valve seat plate 24 is smaller than the outside diameter of the nozzle tip 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a trigger type liquid ejector.

As this type of trigger type liquid ejector, for example, a configuration including an ejector body and a nozzle provided at the front end of the ejector body as shown in Patent Document 1 below is known.
The ejector body includes a suction tube portion extending in the up-down direction, an injection tube portion extending forward from the suction tube portion, a trigger suspended vertically to swing back and forth, and the trigger And a reciprocating pump having a cylinder whose inside is pressurized and depressurized along with the back and forth movement.
The nozzle includes a nozzle body including a connecting cylinder portion connected to the injection cylinder portion, and a valve body provided to be movable forward and backward while being urged forward inside the connecting cylinder portion.
The nozzle body is disposed on the inner side of the connecting tube portion and has a valve seat plate having an annular valve seat plate on which a front end portion of the valve body is seated, and an outer peripheral portion disposed on the front side of the valve seat plate. And a nozzle tip formed with a nozzle communication groove extending over the entire length in the front-rear direction and communicating with the inside of the nozzle hole and the valve seat plate.
By the way, in recent years, with the front end portion of the valve body seated on the valve seat plate, by improving the sealing performance between them, for example, the valve body can be quickly moved back and forth according to the back and forth movement of the trigger, etc. There is a need to improve the operability of liquid ejectors.
As a means for meeting such a demand, it is conceivable to reduce the inner diameter of the valve seat plate on which the front end of the valve body is seated.
Japanese Patent Laid-Open No. 10-128181

  However, in the conventional trigger type liquid ejector, a nozzle body including a valve seat portion and a nozzle tip is integrally formed by injection molding, and a mold for molding a portion located on the front side in the nozzle body at the time of injection molding And the mold for molding the portion located on the rear side, and these molds were moved relatively apart in the front-rear direction when the mold was opened. In order to form a nozzle communication groove that extends and communicates with the inside of the valve seat plate, the inner diameter of the valve seat plate must be greater than or equal to the outer diameter of the nozzle tip, and the front end of the valve body and the valve seat plate There was a problem that it was difficult to improve the sealing performance.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a trigger type liquid ejector that can improve the sealing performance between the front end portion of the valve body and the valve seat plate. To do.

In order to solve the above-mentioned problems and achieve such an object, the trigger type liquid ejector of the present invention comprises an ejector body and a nozzle provided at the front end of the ejector body. The ejector body includes a suction tube portion extending in the up-down direction, an injection tube portion extending forward from the suction tube portion, a trigger suspended vertically to swing back and forth, and the trigger A reciprocating pump having a cylinder whose inside is pressurized and depressurized in accordance with the back-and-forth movement of the nozzle, wherein the nozzle includes a connecting cylinder portion connected to the injection cylinder portion, and the connecting cylinder portion A valve body that is provided to be movable forward and backward in a state of being forwardly biased inward, and the nozzle body is disposed on the inner side of the connecting cylinder portion and a front end portion of the valve body is seated thereon. A valve seat portion having an annular valve seat plate; A nozzle tip that is disposed on the front side of the valve seat plate and extends on the outer peripheral portion over the entire length in the front-rear direction and has a nozzle hole and a nozzle communication groove that communicates with the inside of the valve seat plate. In the trigger type liquid ejector, in the nozzle body, either one of the valve seat part and the nozzle tip is formed integrally with the connecting cylinder part, and the other is formed separately. The inner diameter of the valve seat plate is smaller than the outer diameter of the nozzle tip.
In this invention, in the nozzle body, either one of the valve seat portion and the nozzle tip is formed integrally with the connecting tube portion, and the other is formed as a separate body. Even if a nozzle communication groove that extends over the entire length in the front-rear direction and communicates with the inside of the valve seat plate is formed, the valve seat plate can be formed with its inner diameter smaller than the outer diameter of the nozzle tip. Thus, the pressure applied to the inner peripheral edge of the valve seat plate by the front end of the valve body can be increased to improve the sealing performance between them.

Here, in the nozzle body, the nozzle tip and the connecting cylinder part are integrally formed, and the valve seat part is configured separately, and is provided on the rear surface of the connecting plate that connects the nozzle chip and the connecting cylinder part. An annular fitting groove may be formed, and the valve seat portion may include a valve seat fitting cylinder that protrudes forward from the valve seat plate and is fitted into the fitting groove. .
In this case, in the nozzle body, the nozzle tip and the connecting cylinder part are integrally formed, and the valve seat part is formed separately, so that the gap between the front end part of the valve body and the valve seat plate is as described above. It is possible to reliably form a trigger type liquid ejector with improved sealing performance.
Furthermore, in this case, the valve seat fitting cylinder of the valve seat portion is fitted into the fitting groove formed on the rear surface of the connecting plate, and the valve seat portion is covered from the front by the nozzle tip and the connecting plate. Therefore, it is possible to prevent the valve seat portion from being easily detached from the nozzle body by using the valve seat portion as a separate body.

Further, instead of this configuration, in the nozzle body, the valve seat portion and the connecting tube portion are formed integrally, and the nozzle tip is configured separately, and connects the valve seat portion and the connecting tube portion. A nozzle tip mounting cylinder may be provided on the front surface of the coupling plate so as to protrude forward coaxially with the valve seat plate, and the nozzle chip may be inserted inside the nozzle chip mounting cylinder.
Even in this case, as described above, it is possible to reliably form the trigger type liquid ejector with improved sealing performance between the front end portion of the valve body and the valve seat plate.

Furthermore, the front end portion of the valve body may gradually increase in diameter from the front end toward the rear.
In this case, since the diameter of the front end portion of the valve body gradually increases from the front end toward the rear, the sealing performance between the front end portion of the valve body and the valve seat plate can be further reliably improved.

  According to the trigger type liquid ejector according to the present invention, the sealing performance between the front end portion of the valve body and the valve seat plate can be improved.

Embodiments of the present invention will be described below with reference to the drawings. The trigger type liquid ejector 10 according to this embodiment includes an ejector body 11 and a nozzle 20 provided at the front end of the ejector body 11.
The ejector body 11 has a suction tube portion 12 extending in the vertical direction, an injection tube portion 13 extending forward from the suction tube portion 12, and suspended vertically so as to be swingable. A trigger 15 and a reciprocating pump 14 having a cylinder 14a whose inside is pressurized and depressurized as the trigger 15 moves back and forth are provided.

 The sucking tube portion 12 is a multi-stage tube body including a large diameter portion 12a and a small diameter portion 12b extending upward from the large diameter portion 12a, and a mounting tube attached to the mouth portion of the container body on the large diameter portion 12a. A portion 16 is provided. The small diameter portion 12b of the sucking cylinder portion 12 is fitted with a pipe 17 whose lower end opening is located at the bottom of the container body with the mounting cylinder portion 16 attached to the mouth portion of the container body. . Further, the upper end opening portion of the small diameter portion 12b of the suction tube portion 12 is closed when the inside of the cylinder 14a of the reciprocating pump 14 is pressurized to block communication between the pipe 17 and the injection tube portion 13. When the pressure is reduced, a suction valve 18 is provided that opens to communicate the inside of the pipe 17 with the inside of the injection cylinder 13.

 A cylinder 14a of the reciprocating pump 14 extends in the front-rear direction and opens forward, and a plunger 14b is fitted into the cylinder 14a so as to be slidable in the front-rear direction. The trigger 15 is connected to the front end of the plunger 14b, and the plunger 14b is moved back and forth with respect to the cylinder 14a as the trigger 15 moves back and forth, so that the internal pressure of the cylinder 14a is increased and decreased. It has become.

The nozzle 20 includes a nozzle body 22 having a connecting cylinder part 21 connected to the injection cylinder part 13, a valve body 23 provided to be movable forward and backward while being urged forward inside the connecting cylinder part 21, and It has.
In the illustrated example, the nozzle fitting cylinder portion 19 is watertightly fitted to the outer peripheral surface of the front portion of the injection cylinder portion 13, and the connecting cylinder portion 21 of the nozzle body 22 is connected to the nozzle fitting cylinder portion 19. It is connected to the injection cylinder part 13 via.

 As shown in FIG. 2, the nozzle fitting cylinder portion 19 includes a substrate 19 a extending in a direction orthogonal to the direction in which the injection cylinder portion 13 extends, and a rear surface of the substrate 19 a that protrudes rearward. A first fitting cylinder 19b fitted to the portion 13, and a second fitting cylinder 19c protruding forward from the front surface of the substrate 19a and fitted with the connecting cylinder portion 21 of the nozzle body 22 on the outer peripheral surface; A cylinder cylinder 19d projecting forward on the inner side of the second fitting cylinder 19c on the front surface of the substrate 19a, and a guide protrusion 19e projecting forward on the inner side of the cylinder cylinder 19d on the front surface of the substrate 19a. And.

 Among these, the second fitting cylinder 19c, the cylinder cylinder 19d, and the guide protrusion 19e provided on the front surface of the substrate 19a are arranged coaxially. Further, a liquid outflow hole 19f is formed in the substrate 19a at a position facing the front end opening of the injection cylinder 13 fitted in the first fitting cylinder 19b, and the liquid outflow hole 19f is interposed through the liquid outflow hole 19f. The inside of the injection cylinder part 13 and the cylinder cylinder 19d communicate. In addition, the substrate 19a is formed with an outside air inlet / outlet hole 19g that communicates the gap between the second fitting cylinder 19c and the cylinder cylinder 19d and the outside of the trigger type liquid ejector 10.

  In the present embodiment, the valve body 23 includes a cylindrical valve body 23a whose front end is closed and its rear end is opened, and a flange portion 23b that protrudes from the outer peripheral surface of the valve body 23a at an intermediate portion in the length direction. And a seal tube portion 23c projecting forward from the front surface of the flange portion 23b. The diameter of the seal cylinder portion 23c gradually increases toward the front. In the valve body 23a, a plurality of through holes 23d are formed at intervals in the circumferential direction of the valve body 23a in a portion positioned on the front side of the flange portion 23b in a connection portion with the flange portion 23b. . Further, in the illustrated example, the front end portion 23e of the valve main body 23a gradually increases in diameter from the front end toward the rear.

 The nozzle body 22 is disposed inside the connecting cylinder portion 21 and has a valve seat portion 25 having an annular valve seat plate 24 on which a front end portion 23e of the valve body 23 is seated, and a front side of the valve seat portion 25. And a nozzle tip 28 having a nozzle communication groove 27 formed in the outer peripheral portion extending over the entire length in the front-rear direction and communicating with the inside of the nozzle hole 26 a and the valve seat plate 24. The nozzle tip 28, the valve seat plate 24, and the valve body 23 are arranged coaxially. In the present embodiment, the nozzle body 22 further includes an outer tube portion 29 that surrounds the connecting tube portion 21 from the radially outer side, a sliding tube portion 30 that is disposed radially inward of the connecting tube portion 21, and a nozzle. A cap mounting cylinder portion 31 that surrounds the tip 28 from the outside in the radial direction. Further, the cap mounting cylinder portion 31 is fitted with a nozzle cap 26 having a nozzle hole 26a formed at the front end and an open rear end.

 Then, the second fitting cylinder 19c of the nozzle fitting cylinder part 19 is fitted in a fixed state between the inner peripheral surface of the connecting cylinder part 21 and the outer peripheral surface of the sliding cylinder part 30 in the nozzle body 22, and In the valve body 23, the seal cylinder portion 23 c is fitted to the inner peripheral surface of the sliding cylinder portion 30 so as to be slidable in the front-rear direction in a watertight state, and the valve body 23 a is a cylinder cylinder 19 d of the nozzle fitting cylinder portion 19. Is fitted in the watertight state so as to be slidable in the front-rear direction. Here, the valve body 23 and the guide projection 19e are arranged coaxially, and the valve body 23 is urged forward by a coil spring 32 in which the guide projection 19e is inserted, and the front end portion 23e is It is seated on the seat plate 24.

  In the above configuration, when the trigger 15 is moved backward and the plunger 14b is moved backward with respect to the cylinder 14a, the inside of the cylinder 14a is pressurized, so that the suction valve 18 is closed, and the inside of the pipe 17 and the injection cylinder part. The inside of the injection cylinder 13 is pressurized and the insides of the valve body 23a and the seal cylinder 23c in the valve body 23 are pressurized through the liquid outflow hole 19f. At this time, since the inner diameter of the seal cylinder portion 23c is larger than the inner diameter of the valve main body 23a, the valve body 23 moves backward against the forward urging force of the coil spring 32 due to the difference in pressure receiving area of these 23c and 23a. When the front end 23e of the valve body 23 is separated from the valve seat plate 24, the inside of the injection cylinder 13 and the nozzle hole 26a are connected to the liquid outflow hole 19f, the inside of the valve body 23a, and the seal cylinder 23c. The liquid is ejected from the nozzle hole 26a through the inside, the inside of the valve seat plate 24, and the nozzle communication groove 27 of the nozzle tip 28.

  When the trigger 15 is moved forward from this state and the plunger 14b is moved forward with respect to the cylinder 14a, the inside of the cylinder 14a is depressurized to become negative pressure, whereby the suction valve 18 is opened and the pipe 17 and the injection cylinder are opened. The inside of the portion 13 is communicated, and the liquid in the container body flows into the injection cylinder portion 13 through the pipe 17, and the valve body 23 is moved forward by the forward biasing force of the coil spring 32. The portion 23e is seated on the valve seat plate 24, and the communication between the inside of the injection tube portion 13 and the nozzle hole 26a is blocked.

  In the present embodiment, in the nozzle body 22, the nozzle tip 28 and the connecting cylinder portion 21 are integrally formed, and the valve seat portion 25 is configured separately. On the rear surface of the substantially annular connecting plate 40 that connects the outer peripheral portion of the nozzle tip 28 and the front end of the connecting cylinder portion 21, an annular fitting groove coaxially with the nozzle tip 28, the connecting cylinder portion 21, and the sliding cylinder portion 30. 41 is formed. In the illustrated example, the fitting groove 41 is formed in a portion located inside the sliding cylinder portion 30 on the rear surface of the connecting plate 40.

 Further, the valve seat portion 25 is provided so as to project forward from the valve seat plate 24 and is fitted in the fitting groove 41, and is projected rearward from the valve seat plate 24. And a valve seat sliding cylinder 43. The valve body 23 is provided so as to be slidable in the front-rear direction in the valve seat sliding cylinder 43 with respect to the valve seat plate 24. Further, the inner diameter of the valve seat plate 24 is smaller than the outer diameter of the nozzle tip 28.

  In the illustrated example, the valve seat fitting cylinder 42 has a larger diameter than the valve seat sliding cylinder 43, and the front end portion 23e of the valve body 23 slides in the front-rear direction in the valve seat sliding cylinder 43. It has become. Further, a seal cylinder portion 23 c of the valve body 23 is disposed between the outer peripheral surface of the valve seat sliding cylinder 43 of the valve seat portion 25 and the inner peripheral surface of the sliding cylinder portion 30. The valve seat slide cylinder 43 is formed with a plurality of communication holes 43a that open toward the rear end thereof at intervals in the circumferential direction. Regardless of whether the valve body 23 is seated on the valve seat plate 24 or separated from the valve seat plate 24 through the communication hole 43a and the through-hole 23d formed in the valve body 23a, the inside of the valve body 23a is always provided. And the inside of the seal cylinder portion 23c communicate with each other.

 As described above, according to the trigger type liquid ejector 10 according to the present embodiment, in the nozzle body 22, the nozzle tip 28 is formed integrally with the connecting cylinder portion 21, and the valve seat portion 25 is configured separately. Therefore, even if the nozzle tip groove 28 is formed on the outer peripheral portion of the nozzle tip 28 so as to extend over the entire length in the front-rear direction and communicate with the inside of the valve seat plate 24, the inner diameter of the valve seat plate 24 is reduced. Can be formed smaller than the outer diameter of the nozzle tip 28, and the pressure applied to the inner peripheral edge of the valve seat plate 24 by the front end portion 23e of the valve body 23 is increased to provide a seal between these 23e and 24. Can be improved.

  Further, a valve seat fitting cylinder 42 of the valve seat portion 25 is fitted into a fitting groove 41 formed on the rear surface of the connecting plate 40, and the valve seat portion 25 is connected from the front by the nozzle chip 28 and the connecting plate 40. Since it is covered, it can prevent that this valve seat part 25 becomes easy to remove | deviate from the nozzle main body 22 by having made the valve seat part 25 into a different body.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the nozzle body 28 and the connecting cylinder portion 21 are integrally formed in the nozzle body 22 and the valve seat portion 25 is separated, but this is shown in FIG. As described above, the nozzle body 22 may be configured such that the valve seat portion 25 and the connecting cylinder portion 21 are integrally formed and the nozzle tip 28 is separated.
That is, in the nozzle body 22, either one of the valve seat portion 25 and the nozzle tip 28 is formed integrally with the connecting cylinder portion 21, and the other is formed as a separate body, and the inner diameter of the valve seat plate 24 is The outer diameter of the nozzle tip 28 only needs to be smaller.

Here, in the trigger type liquid ejector 10 shown in FIG. 3, the valve seat portion 25 includes a valve seat sliding cylinder 43 projecting rearward from the valve seat plate 24, and the valve body 23 includes a valve A front surface of a substantially annular connecting plate 40 that is slidable in the valve seat sliding cylinder 43 with respect to the seat plate 24 in the front-rear direction and connects the outer periphery of the valve seat plate 24 and the front end of the connecting cylinder portion 21. In addition, a nozzle tip mounting cylinder 44 is provided so as to protrude forward coaxially with the valve seat plate 24, and a nozzle chip 28 is inserted inside the nozzle chip mounting cylinder 44.
The nozzle tip mounting cylinder 44 and the valve seat plate 24 are arranged coaxially. A nozzle cap 26 is fitted between the nozzle tip mounting cylinder 44 and the nozzle tip 28.

Moreover, in the said embodiment, although the front-end part 23e of the valve body 23 was gradually expanded in diameter as it went back from the front end, you may make it the same outer diameter over the full length in the length direction, for example.
Furthermore, instead of the embodiment, the injection tube portion 13 and the nozzle fitting tube portion 19 may be formed integrally.

  The sealing performance between the front end portion of the valve body and the valve seat plate can be improved.

It is a longitudinal section of a trigger type liquid ejector shown as one embodiment concerning the present invention. It is a principal part enlarged view of the trigger type liquid ejector shown in FIG. It is a principal part enlarged view of the longitudinal cross-sectional view of the trigger type liquid ejector shown as other embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Trigger type liquid ejector 11 Ejector main body 12 Suction cylinder part 13 Injection cylinder part 14 Reciprocating pump 14a Cylinder 15 Trigger 20 Nozzle 21 Connection cylinder part 22 Nozzle main body 23 Valve body 23e Valve body front end part 24 Valve seat plate 25 Valve seat Portion 26a Nozzle hole 27 Nozzle communication groove 28 Nozzle tip 40 Connecting plate 41 Fitting groove 42 Valve seat fitting cylinder 43 Valve seat sliding cylinder 44 Nozzle tip mounting cylinder

Claims (4)

An ejector body, and a nozzle provided at the front end of the ejector body,
The ejector body includes a suction tube portion extending in the vertical direction, an injection tube portion extending forward from the suction tube portion, a trigger suspended vertically to swing back and forth, A reciprocating pump having a cylinder whose inside is pressurized and depressurized in accordance with the longitudinal movement of the trigger,
The nozzle includes a nozzle body provided with a connecting cylinder part connected to the injection cylinder part, and a valve body provided to be movable forward and backward in a state of being biased forward inside the connecting cylinder part,
The nozzle body is disposed on the inner side of the connecting tube portion and has a valve seat portion having an annular valve seat plate on which a front end portion of the valve body is seated, and is disposed on the front side of the valve seat plate and has an outer periphery. A nozzle tip that includes a nozzle tip that extends over the entire length in the front-rear direction and has a nozzle hole and a nozzle communication groove that communicates with the inside of the valve seat plate,
In the nozzle body, one of the valve seat part and the nozzle tip is formed integrally with the connecting cylinder part, and the other is formed as a separate body, and the inner diameter of the valve seat plate is the nozzle A trigger type liquid ejector characterized by being smaller than the outer diameter of the tip. The trigger type liquid ejector according to claim 1,
In the nozzle body, the nozzle tip and the connecting cylinder part are integrally formed, and the valve seat part is configured separately.
An annular fitting groove is formed on the rear surface of the connecting plate that connects the nozzle tip and the connecting cylinder part,
The said valve seat part is provided with the valve seat fitting cylinder which protruded toward the front from the said valve seat board, and was fitted to the said fitting groove, The trigger type liquid ejector characterized by the above-mentioned. The trigger type liquid ejector according to claim 1,
In the nozzle body, the valve seat portion and the connecting cylinder portion are integrally formed, and the nozzle tip is configured separately.
On the front surface of the connecting plate that connects the valve seat portion and the connecting tube portion, a nozzle tip mounting tube projects forwardly coaxially with the valve seat plate, and inside the nozzle tip mounting tube, A trigger type liquid ejector having a nozzle tip inserted therein. The trigger type liquid ejector according to any one of claims 1 to 3,
The trigger type liquid ejector according to claim 1, wherein the front end portion of the valve body gradually increases in diameter from the front end toward the rear.

Images