JP7580325B2 - Trigger-type liquid ejector - Google Patents

Description

The present invention relates to a trigger-type liquid ejector.

A trigger type liquid ejector is known from the prior art, as described in Patent Document 1. This trigger type liquid ejector includes an ejector body that is attached to a container body that contains liquid, and a nozzle member that is attached to the front end of the ejector body and has an ejection hole formed therein for ejecting the liquid forward.
The ejector body extends in the vertical direction and includes a vertical supply tube section that sucks up the liquid in the container body, and a trigger section that is arranged in front of the vertical supply tube section and can move rearward in a forward biased state, and a trigger mechanism that causes the liquid to flow from within the vertical supply tube section toward the ejection hole side by moving the trigger section rearward.
The nozzle member includes a valve chamber that connects the interior of the vertical supply tube portion with the ejection hole, a nozzle body in which the ejection hole is formed, a valve body that is disposed in the valve chamber and blocks communication between the valve chamber and the ejection hole and connects the valve chamber and the ejection hole when the internal pressure of the valve chamber exceeds a predetermined value, and a biasing member that biases the valve body toward the ejection hole.

JP 2017-47350 A

However, from the perspective of reducing the environmental impact and making it easier for users to dispose of the product, there has been a demand to not use a biasing member made of a metallic material.

The present invention was made in consideration of these circumstances, and aims to provide a trigger-type liquid ejector that reduces the environmental impact and allows users to easily dispose of it.

A trigger-type liquid ejector according to one aspect of the present invention comprises an ejector body that is attached to a container body that contains liquid, and a nozzle member that is attached to the front end of the ejector body and has an ejection hole that ejects liquid forward. The ejector body extends in the vertical direction and has a vertical supply tube section that sucks up the liquid in the container body, and a trigger section that is arranged in front of the vertical supply tube section so as to be able to move backward in a forward biased state, and the movement of the trigger section backward ejects the liquid into the vertical supply tube section. and a trigger mechanism for circulating the air from the nozzle toward the nozzle hole side, the nozzle member includes a valve chamber that communicates between the inside of the vertical supply tube and the nozzle hole, a nozzle body in which the nozzle hole is formed, a valve body that is disposed in the valve chamber and blocks communication between the valve chamber and the nozzle hole, and communicates between the valve chamber and the nozzle hole when the internal pressure of the valve chamber exceeds a predetermined value, and a biasing member that biases the valve body toward the nozzle hole side, the biasing member being made of a synthetic resin material.

As the trigger portion is moved rearward to allow liquid to flow from inside the vertical supply tube portion toward the nozzle hole, when the internal pressure in the valve chamber exceeds a predetermined value, the valve body moves while elastically deforming the spring member, connecting the valve chamber and the nozzle hole, and causing the liquid to be sprayed from the nozzle hole.
Since the biasing member is made of a synthetic resin material, the environmental impact is reduced and disposal by users is simplified compared to when the biasing member is made of a metal material. Furthermore, for example, a trigger-type liquid ejector in which all components are made of a synthetic resin material can be realized. As a result, when disposing of the trigger-type liquid ejector, it is not necessary to separate the biasing member from other components made of a synthetic resin material. Therefore, disposal by users can be simplified.

The valve body and the biasing member may be integrally formed from a synthetic resin material.

The valve body and the biasing member are integrally formed from a synthetic resin material, which reduces the number of parts.

The flexural modulus of the synthetic resin material may be 700 MPa or more and 1300 MPa or less.

Since the flexural modulus of the synthetic resin material is 700 MPa or more, it is possible to suppress deformation of the valve body that may cause the valve body to become stiff due to the load applied to the valve body when, for example, the valve body and the biasing member are installed in the valve chamber and when the internal pressure of the valve chamber increases.
Since the flexural modulus of the synthetic resin material is 1,300 MPa or less, it is possible to prevent the valve body and the biasing member from becoming difficult to install into the valve chamber, and it is possible to allow the valve body to move smoothly when the internal pressure of the valve chamber increases.

The valve body includes a cylindrical valve body with a closed front end and an open rear end, a flange portion protruding from the middle of the outer peripheral surface of the valve body in the front-rear direction toward the outside in the nozzle radial direction, and a cylindrical seal portion protruding forward from the front surface of the flange portion. The valve body has a through hole that communicates between the cylindrical seal portion and the valve body, the front end of the valve body is seated on an annular valve seat plate whose inside is connected to the ejection hole so as to be movable rearward, the cylindrical seal portion is fitted slidably in the front-rear direction into a sliding cylindrical portion protruding rearward from the valve seat plate, and the rear end of the valve body is fitted slidably in the front-rear direction into a cylinder arranged in the valve chamber, and a fixed ring is provided that is exteriorly attached to the cylinder and is integrally formed with the biasing member from a synthetic resin material, and the biasing member may connect the fixed ring and the flange portion and extend in the front-rear direction while bending in the nozzle circumferential direction.

When the internal pressure of the valve chamber increases, the internal pressure of the valve chamber is exerted through the through hole into the cylindrical seal portion and into the valve body, and a rearward force is applied to the valve body due to the difference between the pressure-receiving area in the cylindrical seal portion and the pressure-receiving area in the front end portion of the valve body, causing the valve body to move rearward while elastically deforming the biasing member, and the inside of the valve chamber is connected to the ejection hole through the inside of the valve seat plate.
The biasing member connects the flange portion and a fixed ring fixed inside the valve chamber, and extends in the front-to-rear direction while bending circumferentially around the nozzle. This makes it possible to ensure the forward biasing force (bending rigidity) of the biasing member made of a synthetic resin material while suppressing bulkiness of the biasing member.

The present invention reduces the environmental impact and makes disposal easier for users.

FIG. 2 is a vertical cross-sectional view of a trigger-type liquid ejector according to one embodiment. FIG. 2 is a partially enlarged view of FIG.

An embodiment of a trigger type liquid ejector will be described below. As shown in Fig. 1, the trigger type liquid ejector 1 is attached to a container body W containing liquid and includes an ejector body 11 having a vertical supply tube portion 12 that sucks up the liquid in the container body W, and a nozzle member 20 having an ejection hole 26a for ejecting the liquid.
All parts of the trigger type liquid ejector 1 are made of synthetic resin material.

In this embodiment, the direction along the central axis O1 of the vertical supply tube section 12 is referred to as the vertical direction, with the container body W side along the vertical direction being referred to as the lower side and the opposite side being referred to as the upper side. When viewed from the vertical direction, the side where the nozzle member 20 is located relative to the vertical supply tube section 12 is referred to as the front side, and the opposite side is referred to as the rear side. When viewed from the vertical direction, the direction perpendicular to the front-to-rear direction is referred to as the left-to-right direction.

The ejector body 11 is equipped with a vertical supply tube section 12 that extends in the vertical direction, an ejection tube section 13 that is disposed in front of the vertical supply tube section 12 and directs the liquid in the vertical supply tube section 12 toward the ejection hole 26a, a trigger mechanism T having a trigger section 15 that is disposed in front of the vertical supply tube section 12 so as to be movable backward in a forward biased state, and a cover body C that integrally covers the vertical supply tube section 12, the ejection tube section 13, and a cylinder 14a (described later) from above, behind, and from the left and right.

The vertical supply tube 12 is formed in a multi-stage tube shape with a large diameter section 12a and a small diameter section 12b extending upward from the large diameter section 12a. The large diameter section 12a is fitted with an attachment tube 16 that is attached to the mouth of the container body W. A pipe 17 is fitted into the small diameter section 12b. The lower end opening of the pipe 17 is located at the bottom of the container body W when the attachment tube 16 is attached to the mouth. A suction valve 18 is disposed in the upper end of the small diameter section 12b. The suction valve 18 closes when the cylinder 14a described below is pressurized, blocking communication between the pipe 17 and the injection tube section 13, and opens when the pressure is reduced, connecting the pipe 17 and the injection tube section 13.

The injection tube portion 13 extends forward from the vertical supply tube portion 12 , and its inside is connected to the interior of the vertical supply tube portion 12 .
The trigger portion 15 extends downward from the injection tube portion 13 and is disposed so as to be movable rearward in a forward biased state. The trigger portion 15 extends forward as it goes from above to below.

By moving trigger portion 15 rearward, trigger mechanism T introduces liquid from inside vertical supply tube portion 12 into injection tube portion 13 and causes liquid to flow from inside injection tube portion 13 toward nozzle hole 26a.
The trigger mechanism T includes a piston 14b that moves back and forth in conjunction with the trigger portion 15, a cylinder 14a into which the piston 14b is inserted and whose interior is connected to the vertical supply tube portion 12, and an elastic member 43 that urges the trigger portion 15 forward.

The cylinder 14a extends in the front-rear direction and opens forward. The cylinder 14a is formed separately from the vertical supply tube section 12 and is attached to the front surface of the vertical supply tube section 12. A piston 14b is fitted into the cylinder 14a so that it can slide back and forth from its front end opening toward the rear. A trigger section 15 is connected to the front end of the piston 14b, and as the trigger section 15 moves back and forth, the piston 14b moves back and forth relative to the cylinder 14a, thereby pressurizing and depressurizing the inside of the cylinder 14a. The positions of the left-right centers of the cylinder 14a, piston 14b, and trigger section 15 are aligned with each other.

A pair of elastic members 43 are arranged to sandwich the injection tube portion 13 in the left-right direction. The upper end of each elastic member 43 is fixed to the injection tube portion 13 side, and the lower end of each elastic member 43 is fixed to the trigger portion 15. The elastic members 43 are made of a synthetic resin material.

The nozzle member 20 is attached to the front end of the ejector body 11. The ejection holes 26a are open toward the front.
Hereinafter, the direction intersecting the central axis O2 of the ejection hole 26a when viewed from the front-rear direction will be referred to as the nozzle radial direction, and the direction circumferential around the central axis O2 will be referred to as the nozzle circumferential direction.
The nozzle member 20 includes a nozzle body 22 , a valve body 23 , and a biasing member 32 .

The nozzle body 22 is formed with the ejection hole 26a and a valve chamber 45 that connects the interior of the vertical supply cylinder portion 12 with the ejection hole 26a. The nozzle body 22 is provided with a lid 34 that opens and closes the ejection hole 26a from the front of the ejection hole 26a. The lid 34 does not necessarily have to be provided.
The nozzle body 22 includes a connecting member 19 and an outer nozzle 47 .

The connecting member 19 is connected to the injection tube portion 13. As shown in FIG. 2, the connecting member 19 includes a base plate 19a whose front and back surfaces face the front-rear direction and closes the front end opening of the injection tube portion 13, a first fitting tube 19b that protrudes rearward from the rear surface of the base plate 19a and is fitted onto the injection tube portion 13, and a second fitting tube 19c and a cylinder tube 19d that protrude forward from the front surface of the base plate 19a.

The first fitting tube 19b is fitted onto the front portion of the injection tube portion 13. The second fitting tube 19c and the cylinder tube 19d are arranged coaxially with the central axis O2 of the ejection hole 26a. The cylinder tube 19d is located on the inside of the second fitting tube 19c in the nozzle radial direction. A liquid outflow hole 19f is formed in a portion of the substrate 19a that faces the front end opening of the injection tube portion 13 and is located on the inside of the cylinder tube 19d in the nozzle radial direction, and the injection tube portion 13 and the second fitting tube 19c are connected through this liquid outflow hole 19f.

The outer nozzle 47 comprises a fixed cylinder 47a, a valve seat plate 25, a sliding cylinder portion 30, a nozzle shaft portion 28, and a cap mounting cylinder portion 31.

The fixed cylinder 47 a is fitted onto the second fitting cylinder 19 c of the connecting member 19 .
The valve seat plate 25 is formed in a plate shape with the front and back surfaces facing the front-rear direction and covers the front end opening of the fixed cylinder 47a. The valve seat plate 25 is formed in an annular shape. A front end portion 23e of the valve body 23a (described later) is seated on the peripheral edge of the opening on the rear surface of the valve seat plate 25 so as to be movable rearward.
The sliding cylinder portion 30 protrudes rearward from the valve seat plate 25 and is fitted into the front end portion of the second fitting cylinder 19c.

The nozzle shaft portion 28 protrudes forward from the valve seat plate 25 .
The cap mounting cylinder 31 surrounds the nozzle shaft 28 from the outside in the nozzle radial direction. The nozzle tip 26 is fitted into the cap mounting cylinder 31 to cover the front end surface of the nozzle shaft 28 from the front.
The nozzle tip 26 has an ejection hole 26 a formed in its front wall.
A nozzle communication groove 27 extending over the entire length in the front-rear direction is formed on the outer circumferential surface of the nozzle shaft portion 28. The nozzle communication groove 27 communicates between the ejection hole 26a and the inside of the valve seat plate 25 through a spin groove formed in the rear surface of the front wall of the nozzle tip 26.

Here, a foam-forming cylinder 33 is fitted onto the cap mounting cylinder 31. The foam-forming cylinder 33 is disposed in front of the nozzle hole 26a and surrounds the nozzle hole 26a from the outside in the nozzle radial direction. The foam-forming cylinder 33 has an outside air introduction hole 37 formed therein to introduce outside air into the inside. Note that the foam-forming cylinder 33 does not necessarily have to be provided.

The valve body 23 is disposed coaxially with the central axis O2 inside the second fitting tube 19c of the connecting member 19. The inside of the second fitting tube 19c forms a valve chamber 45 in which the valve body 23 is disposed, and which connects the inside of the injection tube portion 13 to the ejection hole 26a. That is, the valve body 23 is disposed in the valve chamber 45, blocks communication between the valve chamber 45 and the ejection hole 26a, and connects the valve chamber 45 and the ejection hole 26a when the internal pressure of the valve chamber 45 exceeds a predetermined value.

The valve body 23 comprises a cylindrical valve body 23a with a closed front end and an open rear end, a flange portion 23b protruding outward in the nozzle radial direction from the middle part in the front-rear direction of the outer peripheral surface of the valve body 23a, and a sealing cylinder portion 23c protruding forward from the front surface of the flange portion 23b.

The front end 23e of the valve body 23a increases in diameter from the front end toward the rear. The rear end of the valve body 23a is fitted into a cylinder 19d disposed in the valve chamber 45 so as to be slidable in the front-rear direction. A through hole 23d is formed in the valve body 23a, which communicates between the inside of the seal cylinder portion 23c and the inside of the valve body 23a.
The flange portion 23 b is provided between the front end portion of the cylinder 19 c and the rear end portion of the sliding cylinder portion 30 disposed within the valve chamber 45 .
The cylindrical seal portion 23c has a diameter that increases toward the front. The cylindrical seal portion 23c is fitted into the sliding cylindrical portion 30 so as to be slidable in the front-rear direction. The inside of the cylindrical seal portion 23c is always in communication with the inside of the valve body 23a through the through hole 23d, regardless of whether the valve element 23 is seated on the valve seat plate 25 or separated from the valve seat plate 25.

The biasing member 32 biases the valve body 23 toward the ejection hole 26a. In the illustrated example, the biasing member 32 biases the valve body 23 forward. The biasing member 32 seats the front end 23e of the valve body 23a on the opening periphery of the rear surface of the valve seat plate 25. The valve body 23 is disposed in the valve chamber 45 in a forward biased state so as to be movable back and forth.

In this embodiment, the valve body 23 and the biasing member 32 are integrally formed from a synthetic resin material, although the valve body 23 and the biasing member 32 may be separate bodies.
The flexural modulus of the synthetic resin material is 700 MPa or more and 1300 MPa or less. Examples of the synthetic resin material include linear low density polyethylene (LLDPE, for example, HJ362N manufactured by Mitsubishi Chemical Corporation), high density polyethylene (HDPE), polypropylene (PP, for example, J707G manufactured by Prime Polymer Co., Ltd.), and soft polybutylene terephthalate (PBT, for example, Novaduran 5505S manufactured by Mitsubishi Engineering Plastics Corporation).

Here, a fixed ring 24 is provided inside the valve chamber 45 and fixed to the exterior of the cylinder 19d.
The biasing member 32 connects the fixing ring 24 and the flange portion 23b, and extends in the front-rear direction while bending in the nozzle circumferential direction. The biasing member 32 is U-shaped when viewed from the outside in the nozzle radial direction. A plurality of biasing members 32 are provided at intervals in the nozzle circumferential direction. The biasing members 32 are separately provided on both sides of the central axis O2 in the nozzle radial direction.

Between the fixed ring 24 and the flange portion 23b, an intermediate ring 29 is provided, which is arranged coaxially with the central axis O2. The intermediate ring 29 is mounted on the exterior of the cylinder 19d so as to be movable in the front-rear direction. The intermediate ring 29 is connected to the apex of the nozzle circumferential direction of the biasing member 32, which is U-shaped when viewed from the outside in the nozzle radial direction. The intermediate ring 29 and the fixed ring 24 are integrally formed from a synthetic resin material together with the valve body 23 and the biasing member 32.

Next, the operation of the trigger type liquid ejector 1 configured as above will be described.
It is assumed that liquid is filled into each part of the ejector body 11 by operating the trigger portion 15 multiple times.

First, the lid 34 is opened to open the ejection hole 26a and the foaming cylinder 33. Next, while elastically deforming the elastic member 43, the trigger 15 is moved backward to move the piston 14b backward relative to the cylinder 14a, pressurizing the cylinder 14a and causing the contents in the cylinder 14a to rise up the vertical supply cylinder 12. This closes the suction valve 18, blocking communication between the pipe 17 and the injection cylinder 13, pressurizing the injection cylinder 13, and supplying liquid to the valve chamber 45 through the liquid outlet hole 19f, and pressurizing the insides of the valve body 23a and the seal cylinder 23c to a predetermined value through the through hole 23d.

At this time, when the internal pressure of the valve body 23a and the sealing cylinder 23c exceeds a predetermined value, a rearward force is applied to the valve body 23 due to the difference between the pressure-receiving area in the front end 23e of the valve body 23a and the pressure-receiving area in the sealing cylinder 23c, causing the valve body 23 to move rearward while elastically deforming the biasing member 32, and the front end 23e of the valve body 23a moves away from the valve seat plate 25. As a result, the inside of the injection cylinder 13 and the ejection hole 26a are connected through the liquid outflow hole 19f, the valve chamber 45, the inside of the valve seat plate 25, and the nozzle communication groove 27 of the nozzle shaft 28, and the liquid is ejected from the ejection hole 26a into the foam-forming cylinder 33.

At this time, negative pressure is created inside the foam-forming tube 33, outside air (air) is introduced into the foam-forming tube 33 through the outside air inlet 37, and the liquid mixes with the outside air inside the foam-forming tube 33, foaming into bubbles, and is ejected from the front end opening of the foam-forming tube 33. The liquid ejected from the ejection hole 26a into the foam-forming tube 33 is in the form of a mist, and for example, this mist of liquid collides with the inner surface of the foam-forming tube 33 inside the foam-forming tube 33, disrupting the flow of the liquid, which is mixed with the outside air and turns into bubbles.

When the internal pressure of the valve body 23a and the sealing tube portion 23c drops, the valve body 23 is moved forward by the forward biasing force of the biasing member 32. Then, the front end portion 23e of the valve body 23a seats on the valve seat plate 25, blocking communication between the valve chamber 45 and the ejection hole 26a. After that, the trigger portion 15 is moved forward by the elastic restoring force of the elastic member 43, and the piston 14b is moved forward relative to the cylinder 14a, reducing the pressure inside the cylinder 14a to a negative pressure. This opens the suction valve 18, connecting the inside of the pipe 17 to the inside of the injection tube portion 13, and the liquid in the container body W flows into the cylinder 14a through the pipe 17.

As described above, in the trigger type liquid ejector 1 according to this embodiment, the valve body 23 and the biasing member 32 are integrally formed from a synthetic resin material, which reduces the number of parts, reduces the environmental impact compared to when the biasing member 32 is formed from a metal material, and makes it easier for users to dispose of the device. Furthermore, for example, it is possible to realize a trigger type liquid ejector 1 in which all components are formed from a synthetic resin material. As a result, when disposing of the trigger type liquid ejector 1, it is not necessary to separate the biasing member 32 from other components made of a synthetic resin material. This makes it easier for users to dispose of the device.

The synthetic resin material from which the valve body 23 and the biasing member 32 are formed has a flexural modulus of 700 MPa or more. Therefore, for example, when the valve body 23 and the biasing member 32 are assembled into the valve chamber 45, and when the internal pressure of the valve chamber 45 increases, the load applied to the valve body 23 can be prevented from causing deformation that would cause the valve body 23 to become streaked.
Since the flexural modulus of this synthetic resin material is 1,300 MPa or less, for example, it is possible to prevent the valve body 23 and the biasing member 32 from becoming difficult to install into the valve chamber 45, and it is possible to smoothly move the valve body 23 when the internal pressure of the valve chamber 45 increases.

The biasing member 32 connects the fixed ring 24 fixed inside the valve chamber 45 to the flange portion 23b, and extends in the front-rear direction while bending around the nozzle circumference, so that the forward biasing force (bending rigidity) of the biasing member 32 made of synthetic resin material can be secured while suppressing the bulkiness of the biasing member 32.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The shape and number of the biasing members 32, for example, may be changed as appropriate.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments and variations may be combined as appropriate.

Reference Signs List 1 Trigger-type liquid ejector 11 Ejector body 12 Vertical supply cylinder portion 15 Trigger portion 19d Cylinder tube 20 Nozzle member 22 Nozzle body 23 Valve body 23a Valve body 23b Flange portion 23c Seal cylinder portion 23d Through hole 23e Front end portion of valve body 24 Fixing ring 25 Valve seat plate 26a Ejection hole 30 Sliding cylinder portion 32 Pressurizing member 45 Valve chamber T Trigger mechanism W Container body

Claims (3)

An ejector body that is attached to a container that contains a liquid;
a nozzle member attached to a front end of the ejector body and having an ejection hole for ejecting liquid forward;
The ejector body includes:
A vertical supply tube portion that extends in a vertical direction and sucks up the liquid in the container body;
a trigger mechanism including a trigger portion disposed in front of the vertical supply tube portion and movable rearward in a forward biased state, the trigger portion moving rearward to cause liquid to flow from inside the vertical supply tube portion toward the nozzle hole,
The nozzle member is
a valve chamber communicating the interior of the vertical supply tube portion with the ejection hole, and a nozzle body in which the ejection hole is formed;
a valve body that is disposed in the valve chamber, that blocks communication between the valve chamber and the ejection hole, and that allows communication between the valve chamber and the ejection hole when the internal pressure of the valve chamber exceeds a predetermined value;
a biasing member that biases the valve body toward the ejection hole side,
The biasing member is made of a synthetic resin material ,
The valve body is
A cylindrical valve body having a closed front end and an open rear end;
a flange portion protruding outward in a nozzle radial direction from a middle portion in a front-rear direction of an outer circumferential surface of the valve body;
A cylindrical seal portion protruding forward from a front surface of the flange portion,
a through hole is formed in the valve body, the through hole communicating between the inside of the cylindrical seal portion and the inside of the valve body;
a front end portion of the valve body is seated on an annular valve seat plate whose inside is in communication with the ejection hole so as to be movable rearward;
The cylindrical seal portion is fitted into a sliding cylindrical portion protruding rearward from the valve seat plate so as to be slidable in a front-rear direction,
A rear end portion of the valve body is fitted into a cylinder disposed in the valve chamber so as to be slidable in the front-rear direction,
a fixing ring is provided which is fixed to the exterior of the cylinder and which is integrally formed with the biasing member using a synthetic resin material;
a biasing member that connects the fixing ring and the flange portion, and extends in a front-rear direction while bending in a nozzle circumferential direction , in a trigger-type liquid ejector; The trigger-type liquid ejector according to claim 1, wherein the valve body and the biasing member are integrally formed from a synthetic resin material. The trigger-type liquid ejector according to claim 2, wherein the flexural modulus of the synthetic resin material is 700 MPa or more and 1300 MPa or less.

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