JP5601654B2 - Trigger type liquid ejector - Google Patents

Description

  The present invention relates to a trigger type liquid ejector.

  As this kind of trigger type liquid ejector, an ejector body that sucks up the liquid from the container body side using a pump operated by the operation of the trigger and pressurizes the liquid pressurized in the pump to the distal end side of the injection flow path, A nozzle member attached to the tip end side of the injection flow path is provided, and a lid member capable of opening and closing the nozzle hole is attached to the tip end of the nozzle member (Patent Document 1).

JP2007-136212A Special table 2006-517858

  Since the liquid ejector of Patent Document 1 is provided with a lid for closing the nozzle hole, it is possible to prevent inconveniences such as dust adhering to the nozzle hole. The trigger may be pulled without forgetting to remove the lid from the tip.

  Even if an attempt is made to pull the trigger while the nozzle hole is closed with the lid, liquid cannot be ejected, resulting in great resistance to the finger pulling the trigger. As a result, it is only necessary for the user to realize that the lid has not been removed from the front end surface of the nozzle member. If this happens, unexpected force may be applied to the pivoting part of the trigger, or the fluid pressure in the pump of the ejector body and the flow path for injection may increase excessively, and the nozzle member may unexpectedly come off from the tip of this flow path. is there.

  As one of the measures for solving this problem, it is conceivable to increase the fitting holding force with the ejector body to the extent that the nozzle member does not come off against the pulling force of the trigger. However, in the idea of countering the pulling force of the trigger, useless loads are applied to various parts of the container (for example, the pivoting part of the trigger).

  In addition, it is conceivable that the liquid in the liquid flow channel is released instead of countering the pulling force of the trigger, but there is a problem in what specific structure and where the liquid is released.

  For example, an air leakage valve for eliminating a pressure imbalance inside and outside the container is known for a nozzle of a pump type dispenser container (paragraph 0060 of Patent Document 2). It is just something that leaks air.

  An object of the present invention is to provide a leak valve that allows the liquid in the pump to escape outside the main channel when the trigger is pulled while the main channel for liquid ejection is closed, and the pump and the inside of the main channel are overpressured. It is to propose a liquid ejector that does not.

The first means includes an ejector including a main flow path 30 for ejecting liquid from the suction port 12 for insertion into the container body to the ejection port 18 through the check valve 14 and the pump 34 operated by the operation of the trigger. A main body 6;
A nozzle member 40 fitted to the injection port 18 side of the main flow path 30 and having a nozzle hole 42 and a nozzle hole opening / closing mechanism 46;
The pump 34 is inserted into a double cylindrical cylinder portion 22 having an open front end surface composed of an inner cylinder 24 and an outer cylinder 26, and in a gap between the double cylinders so that the pump 34 can be advanced and retracted by operating a trigger. It is formed with a cylindrical piston 32,
This pump has a leak valve V that is closed in a normal trigger operation and opens when a trigger operation is performed with the nozzle hole closed, and allows excess pressure in the pump to escape to the outside of the main flow path 30.
The leak valve V is formed by for pressing the tip portion of the cylindrical valve body 24a of expanding to other party of the inner cylinder from the inner peripheral surface of the inner tube 24 to the inner peripheral surface of the cylindrical piston 32.

  This means is provided with a leak valve V in the inner cylinder 24 of the cylinder portion 22 of the pump 34 shown in FIG. 1, and when the trigger 36 is pulled with the nozzle hole closed, it opens as shown in FIG. It escapes out of the main channel 30. However, when the nozzle hole is closed and the trigger is pulled, the valve is not opened immediately, but can be set to open when the excess pressure in the pump reaches a certain level.

  The “leak valve” ensures that a normal trigger operation keeps the sealed state when the nozzle hole is opened. For this purpose, it is desirable to form the valve body of the leak valve with a slightly harder material (PP or the like). The “nozzle hole opening / closing mechanism” is not limited to the illustrated lid body, and may be any mechanism that can substantially close the liquid passage that passes through the nozzle hole, and includes a structure that opens and closes the passage of the nozzle hole by rotating the nozzle head, for example. .

  The second means includes the first means, and the valve body 24a of the leak valve V is formed integrally with the cylinder wall of the inner cylinder 24 on the distal end side of the inner cylinder.

  This means proposes an aspect of a leak valve with good design efficiency. The position of the leak valve is easier to design on the tip side of the inner cylinder than on the position away from the tip of the inner cylinder. In a preferred illustrated example, as shown in FIG. 4, an annular cut (V-shaped groove) 50 is formed in the tip surface of the inner cylinder wall at a certain distance from the outer edge of the surface. A radially outer portion of the groove is a valve body 24a of a leak valve.

  The third means includes the second means, and constitutes an auxiliary flow path 56 that extends from the leak valve V through the inside of the inner cylinder 24 to the return port 56a toward the container body.

  As shown in FIG. 1, this means is provided with an auxiliary flow path 56 extending from the leak valve V toward the container body. As a result, the liquid leaked from the leak valve is not wasted.

  According to the first aspect of the invention, since the pump is provided with the leak valve V that relieves excess pressure, the nozzle member 40 can be removed even if the trigger is forcibly pulled while the nozzle hole is closed. it can.

  According to the invention relating to the second means, the valve body of the leak valve V is integrated with the inner cylinder 24 and provided on the distal end side of the inner cylinder, so that the design is easy.

  According to the invention relating to the third means, since the auxiliary flow path 56 for returning the liquid escaped from the leak valve V to the container body side is provided, the escaped liquid is not wasted.

It is a longitudinal cross-sectional view of the liquid ejector which concerns on 1st Embodiment of this invention. It is an enlarged view of one principal part of the liquid ejector of FIG. It is an enlarged view of the other principal part of the liquid ejector of FIG. It is a figure which expands further and shows the enlarged view of FIG. It is a figure which shows the principal part of FIG. 3 in the state which the leak valve of the liquid ejector of FIG. 1 opened. It is a figure which expands further and shows the enlarged view of FIG. It is the elements on larger scale which looked at the principal part shown in FIG. 6 from the front direction.

  1 to 7 show a liquid ejector according to the first embodiment of the present invention. This liquid ejector is composed of a mounting cylinder 2, an ejector body 6, and a nozzle member 40. These members can be formed of a synthetic resin unless otherwise specified. For the convenience of explanation, the prerequisite components will be described first with the characteristic part of the configuration of the present invention later.

  As shown in FIG. 1, the mounting cylinder 2 has a screw structure for attaching to the mouth and neck of the container body inside the cylinder wall, and an inward flange 2 a is attached to the upper end of the cylinder wall. However, the structure can be changed as appropriate.

  The ejector body 6 includes a vertical pipe 8 having a lower end engaged with the lower surface of the inward flange 2a of the mounting cylinder. In the example of illustration, the lower end part of the said vertical pipe is formed in the attachment cylinder part 9 which is a top large diameter cylinder shape and can be attached in a mounting cylinder. A suction port 12 is opened at the lower end of the suction tube 10 depending from the lower end of the vertical pipe, and a check valve 14 is provided in the upper end portion of the vertical pipe 8. From the upper part of the vertical pipe 8, an injection cylinder 16 communicating with the inside of the vertical pipe is projected forward via a check valve.

  The tip of the injection cylinder 16 opens the injection port 18 forward through an inward flange-shaped front wall, and a small-diameter coupling cylinder for fitting a nozzle member described later from the front wall. 20 is projected forward. In the illustrated example, the tip of the injection cylinder is formed as a separate body, but this is not an essential configuration.

  A cylinder portion 22 is provided below the injection cylinder 16 so as to be connected to the vertical pipe 8. The cylinder portion 22 includes a concentric inner cylinder 24 and an outer cylinder 26 that extend forward from the front wall portion of the vertical pipe, and a pump chamber 28 is formed between the two cylinders.

  The pump chamber 28 communicates with an appropriate position (rear part in the illustrated example) of the cylindrical hole of the injection cylinder, and the main flow from the suction port 12 to the injection port 18 through each of the vertical pipe, the pump chamber, and the injection cylinder. A path 30 is formed.

  In the pump chamber, a cylindrical piston 32 is fitted between the front wall of the vertical pipe so as to advance and retract in the front-rear direction. In this type of cylindrical piston, for example, as shown in Patent Document 1, skirt-like seal portions for contacting the outer cylinder and the inner cylinder are provided on the outer peripheral side and the inner peripheral side, respectively. Only the side seal portion 33 is provided. This will be described later.

  The cylindrical piston 32 and the cylinder part 22 constitute a pump 34. Further, the upper part of the trigger 36 that swings from the injection cylinder 16 is pivotally attached to the front part of the cylindrical piston 32. The cylindrical piston 32 is urged forward by a spring 38 interposed between the injection cylinder and the trigger 36.

  A nozzle member 40 having a nozzle hole 42 is fitted to the tip of the injection cylinder 16. In a preferred example of illustration, the base cylinder 44 of the nozzle member 40 is fitted on the connecting cylinder 20 of the ejector body, and the outer surface of the connecting cylinder 20 and the inner surface of the base cylinder 44 are mutually connected as shown in FIG. Engaging first and second fitting strips 20a and 44a are provided in a circle, and the fitting holding means A of the nozzle member is configured by these both fitting strips.

  The nozzle member 40 has a nozzle hole opening / closing mechanism 46 that can switch between an open state and a closed state of the nozzle hole. The nozzle hole opening / closing mechanism in the illustrated example is formed as a lid pivotally attached to the front surface of the cylinder wall of the nozzle member, but its structure can be changed as appropriate.

  In the present invention, as shown in FIG. 3, a leak valve V is provided in the pump chamber. This leak valve is formed by a valve body 24 a attached to the inner cylinder and a valve seat 32 a which is a part of the inner peripheral surface of the cylindrical piston 32.

  In a preferred illustrated example, as shown in FIG. 4, a cut 50 is formed on the front end surface (front end surface) of the inner cylinder 24 with a predetermined distance d from the outer edge of the front end surface, and the outer side of the cut The above-mentioned valve body 24a is formed as a slightly large-diameter tapered cylinder on the front side.

  The slit 50 has a V-shaped cross section, and a gap 52 in the groove is used as a deformation allowance of the valve body so that the valve body can be deformed in a reduced diameter.

  The cylindrical piston 32 has an entire inner peripheral surface formed in a straight cylindrical shape, and a portion of the inner peripheral surface near the valve body is a valve seat 32a.

  The valve body 24a has a hard elasticity that does not hinder normal pump operation. That is, the leak valve V does not open at the maximum value of the hydraulic pressure in the pump chamber by the trigger operation in the state where the nozzle hole 42 is opened, and corresponds to the fitting force of the fitting holding means A of the nozzle member 40. The valve is configured to open at a pressure lower than the pressure.

  In the illustrated example, the front end portion of the inner cylinder 24 is closed by a front wall including the liquid passage hole 54. However, this configuration can be changed as appropriate.

  In the present embodiment, the leak valve V passes through the liquid passage hole 54, passes through the front wall portion of the vertical pipe 8, passes through the top wall of the mounting tube portion 9, and reaches the return port 56 a toward the container body. The auxiliary passage 56 is opened.

  In the above configuration, when the liquid ejector of the present application is used, the mounting cylinder of the liquid ejector may be attached to the mouth and neck of the container body indicated by an imaginary line in FIG. If the trigger 36 is forcibly pulled while the nozzle hole 42 is closed with the lid which is the nozzle hole opening / closing mechanism 46, the hydraulic pressure in the pump chamber rises and the leak valve V opens as shown in FIG. . The liquid leaking from the leak valve is recovered to the container body side through the auxiliary passage 56. Thereby, the rise of the liquid in the main flow path portion on the downstream side of the pump chamber 28 and the check valve 14 is alleviated. Therefore, it can prevent that the nozzle member 40 remove | deviates from the ejector main body 6. FIG.

2 ... Mounting cylinder 2a ... Inward flange 6 ... Ejector body 8 ... Vertical pipe 9 ... Mounting cylinder 10 ... Suction tube 12 ... Suction port 14 ... Check valve 16 ... Injection cylinder 18 ... Injection port 20 ... Connecting cylinder 20a ... First fitting strip 22 ... Cylinder portion 24 ... Inner cylinder 24a ... Valve body 26 ... Outer cylinder 28 ... Pump chamber 30 ... Main flow path 32 ... Cylindrical piston 32a ... Valve seat 33 ... Sealing portion 34 ... Pump 36 ... Trigger 38 ... Spring 40 ... Nozzle member 42 ... Nozzle hole 44 ... Base tube 44a ... Second fitting strip 46 ... Nozzle hole opening / closing mechanism 50 ... Split 52 ... Gap 54 ... Liquid passage hole 56 ... Auxiliary flow path 56a ... Return port A ... Fit Joint holding means V ... Leak valve

Claims (3)

A main flow path (30) for liquid ejection from the suction port (12) for insertion into the container body through the check valve (14) and the pump (34) operated by the operation of the trigger to the ejection port (18) An ejector body (6) including:
A nozzle member (40) fitted to the injection port (18) side of the main flow path (30) and having a nozzle hole (42) and a nozzle hole opening / closing mechanism (46);
The pump (34) is advanced and retracted by operating a trigger into a double cylindrical cylinder portion (22) having an open front end composed of an inner cylinder (24) and an outer cylinder (26 ), and a gap between the double cylinders. Formed with a cylindrical piston (32) inserted so as to be possible ,
This pump is closed by a normal trigger operation, and a leak valve (V) that opens when the trigger operation is performed with the nozzle hole closed and releases excess pressure in the pump to the outside of the main flow path (30 ). Have
The leak valve (V) is the inner peripheral surface of the cylindrical piston front portion (32) of the inner other party to the expanding cylindrical valve element of the inner tube from the peripheral surface (24a) of the inner tube (24) A trigger type liquid ejector characterized by being formed by press-contacting to a surface.   2. The trigger type liquid jet according to claim 1, wherein the valve body (24a) of the leak valve (V) is formed integrally with the cylindrical wall of the inner cylinder (24) on the distal end side of the inner cylinder. vessel.   The trigger type according to claim 2, wherein an auxiliary flow path (56) extending from the leak valve (V) through the inner cylinder (24) to the return port (56a) toward the container body is formed. Liquid ejector.