JP2023020304A - trigger type liquid ejector - Google Patents

Abstract

To provide a trigger type liquid ejector which can improve liquid breakage resistance.SOLUTION: A trigger type liquid ejector comprises a valve body 41 which moves forward and backward in linkage with forward and backward movement of a piston 52, and switches between communication and blockage between the inside of a container body A and the inside of a cylinder 51 through the inside a vertical supply cylinder part 20. The valve body 41 is provided with: a communication passage 65 which communicates the inside of a piston body 56 with a second hole 20n; and a depression 66 which forms a clearance S2, which communicates the inside of the cylinder 51 with the communication passage 65, between the piston body 52 and the valve body 41 in such a manner that inner lip parts 58 face each other when the piston 52 is positioned at a rear-most end position.SELECTED DRAWING: Figure 2

Description

The present invention relates to trigger-type liquid ejectors.

As a trigger-type liquid ejector, a vertically extending vertical supply cylinder, a nozzle member having an ejection hole for ejecting liquid forward, and a trigger mechanism for circulating the liquid in the vertical supply cylinder toward the ejection hole. , is disclosed (see, for example, Patent Document 1 below). The trigger mechanism includes a cylinder that communicates with the vertical supply cylinder, and a piston that slides back and forth on the inner peripheral surface of the cylinder as the trigger moves back and forth.
According to this configuration, when the trigger part is pulled backward, the inside of the cylinder is pressurized by the piston, so that the liquid inside the cylinder flows through the vertical supply cylinder part toward the ejection hole. As a result, the liquid is ejected through the ejection holes. On the other hand, the inside of the cylinder is decompressed in the process of returning the trigger part forward, so that the liquid in the container body is sucked up into the vertical supply tube part. The liquid sucked into the vertical supply cylinder flows into the cylinder.

JP 2020-50423 A

By the way, in the trigger-type liquid ejector, the pressure in the cylinder increases due to the rearward stroke of the trigger portion, and the pressure in the cylinder decreases as the liquid is ejected. Therefore, the pressure in the cylinder rises from the beginning to the middle of the ejection operation, and decreases from the middle to the end of the ejection operation. When the pressure inside the cylinder is relatively high, such as at the beginning or middle of the ejection operation, the liquid is vigorously ejected from the ejection hole at the desired ejection pressure. However, when the pressure in the cylinder drops at the end of the ejection operation (when the residual pressure in the cylinder is insufficient), the force of the liquid ejected from the ejection holes weakens. As a result, liquid may drip from the orifice (so-called dripping). Also, if residual pressure (higher than atmospheric pressure) still exists in the cylinder when the piston reaches the rear end position, the residual pressure will cause the liquid to drip without the need to operate the trigger. there is a possibility.

SUMMARY OF THE INVENTION The present invention provides a trigger-type liquid ejector capable of improving liquid drainability.

In order to solve the above problems, the present invention employs the following aspects.
A trigger-type liquid ejector according to an aspect of the present invention includes an ejector body attached to a container body containing a liquid, and an ejector body provided at the front end of the ejector body for ejecting the liquid forward. a nozzle member having a hole formed therein, the ejector main body comprising a vertical supply tube portion extending in the vertical direction; and a trigger provided in front of the vertical supply tube portion so as to be movable rearward in a forward biased state. and a trigger mechanism that causes the liquid to circulate from the vertical supply tube portion toward the ejection hole by moving the trigger portion rearward, wherein the trigger mechanism is linked to the forward and backward movement of the trigger portion. a cylinder into which the piston is slidably inserted in the front-rear direction; a valve body for switching between communication with and disconnection from the inside of the cylinder, and a first hole in the ejector body through which the liquid inside the cylinder passes toward the inside of the vertical supply tube portion when the piston moves backward. and a second hole that is closed by the valve body when the piston moves backward and is opened when the piston moves forward, thereby allowing the liquid in the container body to flow into the cylinder through the vertical supply cylindrical portion. , wherein the piston includes a cylindrical piston body with the valve body inserted therein, a lip portion that protrudes inward from the piston body and is capable of slidably contacting the outer peripheral surface of the valve body; The valve body includes a communication passage that communicates between the inside of the piston body and the second hole, and the lip portion faces at least when the piston is at the rear end position, so that the piston and the and a recess that forms a gap that allows communication between the inside of the cylinder and the communication path.

According to this aspect, by moving the valve body back and forth in conjunction with the back and forth motion of the piston, even if the valve body becomes difficult to move, for example, by leaving the trigger type liquid ejector for a while, the movement of the valve body becomes difficult. The movement can force the valve body to move backwards. As a result, even when the trigger type liquid ejector is used infrequently, it is possible to maintain operational reliability over a long period of time.
In particular, in this aspect, when the trigger part is at least at the rearmost position, the inside of the cylinder and the inside of the container communicate with each other through the inside of the piston body, the communicating passage and the second hole. Thereby, the residual pressure in the cylinder can be released into the container body. Therefore, it is possible to suppress dripping caused by insufficient residual pressure in the cylinder at the final stage of the ejection operation or the like. Moreover, since the residual pressure in the cylinder can be reliably reduced, it is possible to suppress liquid dripping due to the residual pressure while the trigger portion is moved to the rearmost position. As a result, the liquid drainability can be improved.

In the trigger-type liquid ejector of the above aspect, the ejector main body is provided with a connection hole connecting between the ejection hole and the vertical supply tube portion, and the ejector main body is directed toward the connection hole. A pressure accumulator valve is provided so as to be able to come into contact with and separate from the opening edge of the connection hole in a biased state, and switches between communication and cutoff between the inside of the vertical supply cylindrical portion through the connection hole and the ejection hole. preferably.
According to this aspect, after the liquid is accumulated to a predetermined pressure on the upstream side of the connection hole, the liquid can be guided to the ejection hole through the connection hole. As a result, the ejection state can be stabilized.
Further, in this aspect, the inside of the cylinder and the container body communicate with each other through the inside of the piston body, the communication passage and the second hole, so that the gas existing upstream of the connection hole is directed into the container body during the priming operation. can be discharged effectively. As a result, the surroundings of the pressure accumulator valve can be easily filled with liquid by the priming operation, and the ejection state at the time of the initial ejection can be stabilized.
Moreover, in this aspect, the pressure of the liquid acting on the pressure accumulator valve drops below the predetermined pressure at the end of the ejection operation or the like, so that the communication between the ejection hole and the vertical supply cylinder through the connection hole is cut off. As a result, the liquid drainability can be improved more reliably.

In the trigger-type liquid ejector of the above aspect, the ejector body extends forward from the upper end of the vertical supply tube portion and is an injection tube disposed between the nozzle member and the vertical supply tube portion. wherein the connecting hole connects the inside of the vertical supply cylinder portion and the inside of the injection cylinder portion, and the pressure accumulator valve is provided in the vertical supply cylinder portion so as to be movable downward while being biased upward. .
According to this aspect, the volume of the space between the inside of the cylinder and the pressure accumulator can be made smaller than when the pressure accumulator is provided in the nozzle member. This allows less gas to be exhausted in the priming operation. As a result, the time required for the priming operation can be shortened. In addition, after the priming operation, it is possible to suppress the gas from remaining around the pressure accumulator, thereby stabilizing the ejection state at the time of the initial ejection.

According to the aspect of the present invention, it is possible to improve the liquid drainability.

1 is a cross-sectional view of a trigger-type liquid ejector according to an embodiment; FIG. 1 is an enlarged cross-sectional view of a trigger-type liquid ejector according to an embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the embodiments and modifications described below, the same reference numerals may be assigned to corresponding configurations, and descriptions thereof may be omitted.
As shown in FIG. 1, a trigger-type liquid ejector 1 of this embodiment is capable of ejecting liquid contained in a container body A. As shown in FIG. The trigger-type liquid ejector 1 includes an ejector body 10 , a nozzle member 11 , a trigger mechanism 14 having a pump section 13 , and a cover 15 . Note that each component of the trigger type liquid ejector 1 is a molded product using synthetic resin unless otherwise specified.

The ejector main body 10 includes a vertical supply cylinder portion 20 , a mounting cap 21 , a pipe 22 , a cylinder mounting cylinder 23 , an injection cylinder portion 24 and a relay member 25 .

Hereinafter, the direction (axial direction) along the axis O1 of the vertical supply tube portion 20 is defined as the vertical direction, the bottom (not shown) side of the container body A is defined as the lower side, and the opposite side is defined as the upper side. A direction that intersects the axis O1 when viewed from above and below is defined as a radial direction. The direction in which the vertical supply tube portion 20 and the nozzle member 11 are aligned in the radial direction is defined as the front-rear direction. In the front-rear direction, the nozzle member 11 side with respect to the vertical supply tube portion 20 is the front side, and the opposite side is the rear side. Moreover, let the direction orthogonal to the front-back direction seen from an up-down direction among radial directions be a left-right direction.

The liquid sucked up from the container body A by the pump part 13 flows through the vertical supply cylinder part 20 . A flange portion 20a that protrudes radially outward is formed at the lower end portion of the vertical supply tube portion 20 .

A partition portion 20 b is provided in the vertical middle portion of the vertical supply tube portion 20 . The partition portion 20b partitions the interior of the vertical supply cylinder portion 20 in the vertical direction. A portion of the vertical supply cylinder portion 20 located above the partition portion 20b constitutes a first flow path 20c that communicates with the ejection holes 11b through the injection cylinder portion 24 and the like. On the other hand, a portion of the vertical supply tubular portion 20 located below the partition portion 20b constitutes a second flow path 20d that communicates with the inside of the container body A. As shown in FIG. In addition, the partition part 20b is not an essential structure.

A connection hole 20f is formed in the upper end portion of the vertical supply tube portion 20 (second flow path 20d). The connection hole 20f is formed in an L shape when viewed from the side. That is, the lower end opening of the connection hole 20f opens downward within the vertical supply tube portion 20 . On the other hand, the upper end opening of the connection hole 20f opens forward.

A pressure accumulation valve 30 is provided in the upper end portion of the vertical supply tube portion 20 . The pressure accumulation valve 30 is urged upward by a coil spring 31 so as to be movable downward. The pressure accumulation valve 30 is separably seated on the lower opening edge of the connection hole 20f to close the connection hole 20f. A small-diameter piston portion 30 a is formed in the lower portion of the pressure accumulation valve 30 , and a large-diameter piston portion 30 b is formed in the upper portion of the pressure accumulation valve 30 . The pressure of the liquid in the vertical supply tubular portion 20 (first flow path 20c) acts on each of the piston portions 30a and 30b. When the pressure of the liquid acting on the pistons 30a and 30b rises above a certain level, the pressure accumulation valve 30 descends due to the difference in the pressure receiving areas of the pistons 30a and 30b. As a result, the accumulator valve 30 is separated from the lower opening edge of the connection hole 20f, and the inside of the vertical supply cylinder portion 20 and the inside of the injection cylinder portion 24 are communicated through the connection hole 20f.

The mounting cap 21 is formed in a tubular shape extending in the vertical direction. The mounting cap 21 is detachably fastened to the opening A1 of the container body A with the flange 20a sandwiched between it and the upper opening edge of the opening A1. The method of fixing the mounting cap 21 and the opening A1 may be a method other than screws (for example, fitting).

The pipe 22 is fitted into the vertical supply tubular portion 20 from below the vertical supply tubular portion 20 through the mounting cap 21 . The pipe 22 extends downward inside the container body A when the trigger type liquid ejector 1 is attached to the container body A. As shown in FIG.

The cylinder mounting tube 23 is provided in a portion positioned above the mounting cap 21 in front of the vertical supply tube portion 20 . The cylinder mounting tube 23 is formed in a bottomed tubular shape that opens forward.

The injection cylinder portion 24 allows the liquid in the vertical supply cylinder portion 20 to flow toward the nozzle member 11 . The injection cylinder portion 24 extends forward from the upper end portion of the vertical supply cylinder portion 20 . The injection cylinder portion 24 communicates with the vertical supply cylinder portion 20 through the upper end opening of the connection hole 20f.
The relay member 25 connects between the injection cylinder portion 24 and the nozzle member 11 . The relay member 25 is attached to the injection cylinder portion 24 from the front.

The nozzle member 11 is attached to the relay member 25 from the front side of the relay member 25 . The nozzle member 11 is formed in a capped tubular shape that opens rearward. A top wall portion 11a of the nozzle member 11 is formed with a jet hole 11b penetrating the top wall portion 11a in the front-rear direction. In the nozzle member 11, an ejection cylinder 11c protrudes forward from the top wall portion 11a. The ejection cylinder 11c surrounds the ejection hole 11b. The ejection tube 11c is formed with an outside air introduction hole 11d that communicates the inside and the outside of the ejection tube 11c.

The trigger mechanism 14 includes a pump portion 13 , a valve body 41 and a trigger portion 42 .
The pump section 13 includes a cylinder 51 and a piston 52 .
The cylinder 51 is formed in a tubular shape centered on an axis O2 extending in the front-rear direction. The cylinder 51 is fitted into the cylinder mounting tube 23 from the front side of the cylinder mounting tube 23 . A restriction portion 54 is provided at the rear end portion of the cylinder 51 . The restricting portion 54 is formed in an annular shape coaxial with the axis O2. The restriction portion 54 is connected to the rear end inner peripheral surface of the cylinder 51 via the bridge portion 51a. In the following description, the direction intersecting the shaft edge O2 when viewed from the front-rear direction may be referred to as the radial direction of the pump.

The piston 52 is provided movably in the front-rear direction with respect to the cylinder 51 . The piston 52 has a piston body 56 , an outer lip portion 57 and an inner lip portion 58 .
The piston body 56 is formed in a bottomed cylindrical shape that opens toward the rear. The piston body 56 is provided coaxially with the cylinder 51 and is inserted into the cylinder 51 from the front side of the cylinder 51 .

The outer lip portion 57 protrudes outward in the radial direction of the pump from the rear end portion of the piston body 56 . The outer lip portion 57 is in close contact with the inner peripheral surface of the cylinder 51 . The outer lip portion 57 slides on the inner peripheral surface of the cylinder 51 as the piston 52 moves back and forth with respect to the cylinder 51 .
The inner lip portion 58 protrudes inward in the pump radial direction from the inner peripheral surface of the piston body 56 .

A first hole 20m and a second hole 20n are formed in a portion of the vertical supply tube portion 20 described above that overlaps the bottom wall portion of the cylinder mounting tube 23 (hereinafter referred to as an overlapping portion 20j). 20 m of 1st holes are formed in the part located above the partition part 20b in the overlapping part 20j. The first hole 20m communicates between the inside of the cylinder 51 and the first flow path 20c. The second hole 20n is formed in the overlapping portion 20j below the partition portion 20b and coaxially with the axis O2. The second hole 20n communicates with the inside of the piston body 56 through the valve body 41 .

The valve body 41 is provided inside the piston body 56 . The valve body 41 moves back and forth in conjunction with the back and forth movement of the piston 52 . The valve body 41 includes a valve body 60 and a protrusion 61 .

The valve body 60 is formed in a cylindrical shape coaxial with the axis O2. A front portion of the valve body 60 is inserted inside the piston body 56 from behind the piston body 56 . The inner lip portion 58 is in close contact with the outer peripheral surface of the valve body 60 . Therefore, the portion surrounded by the piston body 56, the inner lip portion 58 and the valve body 60 forms a closed space S1. A rear portion of the valve body 60 is inserted inside the restricting portion 54 . The movement of the valve body 41 in the radial direction of the pump with respect to the cylinder 51 is restricted by moving back and forth while the valve body 60 is guided by the restriction portion 54 .

The rear edge of the valve body 60 is provided so as to be able to come into contact with and separate from the front opening edge of the second hole 20n as the valve body 41 moves back and forth. Specifically, the valve body 41 closes the second hole 20n by bringing the rear edge of the valve body 60 into contact with the front opening edge of the second hole 20n. Thereby, direct communication between the second hole 20n and the inside of the cylinder 51 is cut off. On the other hand, the valve body 41 opens the second hole 20n into the cylinder 51 by separating the rear edge of the valve body 60 forward from the front opening edge of the second hole 20n.

The piston 52 moves together with the valve body 41 when, for example, the rearward pressing force via the trigger portion 42 is less than the static frictional force acting between the inner lip portion 58 and the outer peripheral surface of the valve body 60 . On the other hand, when the rearward pressing force of the piston 52 via the trigger portion 42 is greater than the static frictional force acting between the inner lip portion 58 and the outer peripheral surface of the valve body 60, the inner lip portion 58 moves toward the valve body. It slides on the outer peripheral surface of 60 . This causes the piston 52 to move relative to the valve body 41 .

A communication passage 65 is formed inside the valve body 60 so as to pass through the valve body 60 in the front-rear direction. The communicating passage 65 is arranged coaxially with the axis O2. A front end opening of the communication passage 65 communicates with the inside of the piston body 56 (space S1). A rear end opening of the communication path 65 opens toward the second hole 20n. That is, the communication passage 65 directly communicates with the second hole 20n when the valve body 41 closes the second hole 20n.

As shown in FIG. 2, a recessed portion 66 is formed in the rear portion of the valve body 60 (a portion located forward of the restricting portion 54). The recessed portion 66 is recessed inward in the pump radial direction with respect to the outer peripheral surface of the valve body 60 and extends over the entire circumference around the axis O2. However, the recesses 66 may be formed intermittently around the axis O2 in the valve body 60 . The recessed portion 66 faces the inner lip portion 58 in the pump radial direction when the piston 52 is at least in the rearmost position. Specifically, the inner lip portion 58 is received within the recessed portion 66 when the piston 52 is at least in the rearmost position. At this time, the tip of the inner lip portion 58 is separated from the inner surface of the recessed portion 66 in the radial direction of the pump. Therefore, a gap S2 is formed between the inner lip portion 58 and the valve body 60. As shown in FIG. The gap S2 allows communication between the inside of the cylinder 51 and the space S1.

The projecting portion 61 is provided at the rear end portion of the valve body 60 (the portion located behind the restricting portion 54). The projecting portion 61 protrudes outward in the radial direction of the pump from the rear end portion of the valve body 60 . The projecting portion 61 abuts on the restricting portion 54 from behind the restricting portion 54 to restrict the forward movement of the valve body 41 with respect to the cylinder 51 . A plurality of protrusions 61 are provided at the rear end of the valve body 60 at intervals around the axis O2.

As shown in FIG. 1, the trigger part 42 is provided in front of the pump part 13 so as to be movable back and forth. Specifically, the trigger portion 42 extends in front of the pump portion 13 while being inclined forward as it goes downward from above. The trigger part 42 is a part that is gripped when performing a jetting operation, and an index finger or the like is hooked from the front. A front end portion of a piston body 56 is connected to a vertically intermediate portion of the trigger portion 42 . That is, the piston 52 moves back and forth in conjunction with the back and forth movement of the trigger portion 42 .

An upper end portion of the trigger portion 42 is supported by the relay member 25 so as to be rotatable around an axis along the left-right direction. A biasing member 69 is interposed between the trigger portion 42 and the relay member 25 . The biasing member 69 biases the trigger portion 42 forward.

With the nozzle member 11 exposed, the cover 15 surrounds a portion of the ejector body 10 above the mounting cap 21 from above, rear, and sides.

Next, the case of using the trigger type liquid ejector 1 configured as described above will be described. In the following description, it is assumed that each part of the trigger type liquid ejector 1 is filled with liquid by performing the priming operation. Note that the priming operation will be described later.

In using the trigger type liquid ejector 1, a finger is hooked on the trigger part 42 and the trigger part 42 is pulled backward. Then, the trigger portion 42 rotates around the upper end portion as a fulcrum, thereby moving the trigger portion 42 backward against the biasing force of the biasing member 69 . As a result, the trigger part 42 moves rearward in a forward biased state.

As the trigger portion 42 moves backward, the piston 52 moves backward within the cylinder 51 . At the time of initial movement, the rearward pressing force acting on the piston 52 via the trigger portion 42 is smaller than the static frictional force acting between the piston 52 and the valve body 41 . Therefore, as the piston 52 moves backward, the piston 52 and the valve body 41 move backward together. The valve body 41 closes the second hole 20n by being seated on the front opening edge of the second hole 20n. This restricts the rearward movement of the valve body 41 with respect to the cylinder 51 .

When the piston 52 is pushed further rearward while the second hole 20n is closed, the piston 52 moves rearward with respect to the valve body 41 . Thereby, the inside of the cylinder 51 is pressurized. When the inside of the cylinder 51 is pressurized, the liquid inside the cylinder 51 mainly flows into the first flow path 20c through the first holes 20m. The pressure accumulation valve 30 is pressurized by the liquid flowing into the first flow path 20c. In the pressure accumulation valve 30, the inner diameter of the large-diameter piston portion 30b is larger than the inner diameter of the small-diameter piston portion 30a. Therefore, a downward pressure acts on the accumulator valve 30 due to the difference in the pressure receiving areas of the small-diameter piston portion 30a and the large-diameter piston portion 30b. When the pressure acting on the pressure accumulation valve 30 reaches or exceeds a predetermined pressure, the pressure accumulation valve 30 descends against the upward biasing force of the coil spring 31 . As a result, the upper end of the accumulator valve 30 is separated from the lower opening edge of the connection hole 20f, and the inside of the vertical supply cylinder part 20 and the inside of the injection cylinder part 24 are communicated through the connection hole 20f. After passing through the connection hole 20f and flowing into the ejection cylinder portion 24, the liquid is ejected to the outside through the ejection hole 11b after passing through the relay member 25. As shown in FIG.

In addition, in this embodiment, the ejection cylinder 11c is provided with an outside air introduction hole 11d. Therefore, when the liquid passes through the ejection tube 11c, the inside of the ejection tube 11c becomes negative pressure, and outside air is introduced into the ejection tube 11c through the outside air introduction hole 11d. As a result, outside air is mixed with the liquid passing through the ejection cylinder 11c, and the liquid is ejected in the form of bubbles.

Here, when the trigger portion 42 is moved to the rearmost position, the inner lip portion 58 and the recessed portion 66 of the valve body 60 face each other in the pump radial direction. As a result, a gap S2 is formed between the inner lip portion 58 and the valve body 60 to allow communication between the inside of the cylinder 51 and the space S1. Then, the liquid inside the cylinder 51 is drawn into the space S1 due to the influence of the differential pressure between the inside of the cylinder 51 and the space S1. As a result, in the ejector main body 10 , the liquid located downstream of the cylinder 51 (for example, the first flow path 20 c or the injection tube portion 24 ) is drawn into the cylinder 51 . On the other hand, the liquid that has flowed into the space S1 flows back into the container body A through the pipe 22 after flowing into the second channel 20d through the communication path 65 and the second hole 20n.

When the operation of the trigger portion 42 is released, the restoring force of the biasing member 69 causes the trigger portion 42 to move forward. Along with this, the piston 52 is restored forward relative to the cylinder 51 . Specifically, during the initial movement, the forward tensile force acting on the piston 52 via the trigger portion 42 is smaller than the static frictional force acting between the piston 52 and the valve body 41 . Therefore, as the piston 52 moves forward, the piston 52 and the valve body 41 move forward together. Thereby, the second hole 20n is opened. The forward movement of the valve body 41 with respect to the cylinder 51 is restricted by coming into contact with the restricting portion 54 via the protruding portion 61 . In this state, the piston 52 is pulled forward via the trigger portion 42 to move the piston 52 forward with respect to the valve body 41 . As a result, the pressure inside the cylinder 51 is reduced. When the inside of the cylinder 51 is decompressed, the liquid inside the container body A is sucked up through the pipe 22 into the vertical supply tubular portion 20 (second flow path 20d). The liquid that has flowed into the second flow path 20d flows into the cylinder 51 through the second holes 20n.

By the way, in the trigger-type liquid ejector 1, the priming operation of filling the cylinder 51 with the liquid is performed by performing the pulling operation of the trigger portion 42 a plurality of times at the start of use. Specifically, the inside of the cylinder 51 is pressurized in the same manner as the ejection operation described above because the piston 52 moves backward in the process of the trigger portion 42 moving backward. Then, the gas in the cylinder 51 flows into the first flow path 20c through the first hole 20m. The pressure accumulation valve 30 opens the connection hole 20f by pressurizing the inside of the first flow path 20c by the gas that has flowed into the first flow path 20c. As a result, the gas inside the cylinder 51 is discharged to the outside through the ejection holes 11b. In this embodiment, the inside of the container body A and the inside of the cylinder 51 communicate with each other through the communication passage 65 when the trigger part 42 is at least at the rearmost position. Therefore, even if the connection hole 20f is not opened, by moving the trigger part 42 to the rearmost position, the gas in the cylinder 51 passes through the gap S2 and the space S1, and then flows through the communication path 65 and the second hole. 20n into the container body A.

On the other hand, the pressure in the cylinder 51 is reduced in the same manner as in the ejection operation described above because the piston 52 moves forward while the trigger portion 42 moves forward. Thereby, the liquid in the container body A flows into the cylinder 51 . The cylinder 51 is filled with the liquid by performing the operation described above a plurality of times.

As described above, in the present embodiment, the valve body 41 moves back and forth in conjunction with the back and forth movement of the piston 52 to switch communication and disconnection between the inside of the container body A and the inside of the cylinder 51 through the vertical supply tube portion 20. It was configured to include
According to this configuration, by moving the valve body 41 back and forth in conjunction with the back and forth movement of the piston 52, even if the valve body 41 becomes difficult to move, for example, if the trigger type liquid ejector 1 is left for a while. , the valve body 41 can be forcibly moved backward by the backward movement of the piston 52 . As a result, even when the trigger type liquid ejector 1 is used infrequently, it is possible to maintain operational reliability over a long period of time.
In particular, in the present embodiment, the valve body 41 has a communication passage 65 that communicates the inside of the piston body 56 with the second hole 20n, and a communication path 65 between the piston 52 and the valve body 41 when the piston 52 is at the rearmost end position. and a recessed portion 66 forming a gap S2 in.
According to this configuration, when the trigger part 42 is at least at the rearmost position, the inside of the cylinder 51 and the inside of the container body A communicate with each other through the inside of the piston body 56, the communication passage 65, and the second hole 20n. Thereby, the residual pressure in the cylinder 51 can be released into the container body A. Therefore, it is possible to suppress dripping caused by insufficient residual pressure in the cylinder 51 at the end of the ejection operation or the like. Moreover, since the residual pressure in the cylinder 51 can be reliably reduced, it is possible to suppress liquid dripping caused by the residual pressure while the trigger portion 42 is moved to the rearmost position. As a result, the liquid drainability can be improved.

In this embodiment, the ejector main body 10 is provided with the accumulator valve 30 which is provided so as to be able to come into contact with and separate from the opening edge of the connection hole 20f while being biased toward the connection hole 20f.
According to this configuration, after the liquid is accumulated to a predetermined pressure on the upstream side of the connection hole 20f, the liquid can be guided to the ejection hole 11b through the connection hole 20f. As a result, the ejection state can be stabilized.
In this embodiment, the inside of the cylinder 51 and the inside of the container body A communicate with each other through the inside of the piston body 56, the communication passage 65, and the second hole 20n. The existing gas can be effectively discharged toward the inside of the container body A. As a result, the area around the pressure accumulator valve 30 can be easily filled with liquid by the priming operation, and the ejection state at the time of the initial ejection can be stabilized.
Moreover, in the present embodiment, the pressure of the liquid acting on the accumulator valve 30 is reduced to less than the predetermined pressure at the final stage of the ejection operation or the like, thereby allowing communication between the ejection hole 11b and the vertical supply cylinder portion 20 through the connection hole 20f. is blocked. As a result, the liquid drainability can be improved more reliably.

In this embodiment, the accumulator valve 30 is provided in the vertical supply tube portion 20 so as to be movable downward while being biased upward.
According to this configuration, the volume of the space between the cylinder 51 and the pressure accumulation valve 30 can be made smaller than when the pressure accumulation valve 30 is provided in the nozzle member 11 . This allows less gas to be exhausted in the priming operation. As a result, the time required for the priming operation can be shortened. In addition, after the priming operation, it is possible to suppress the gas from remaining around the pressure accumulating valve 30 and stabilize the ejection state at the time of the initial ejection.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other changes in configuration are possible without departing from the scope of the present invention. The present invention is not limited by the foregoing description, but only by the appended claims.
Although the configuration in which the trigger portion 42 is rotatable has been described in the above-described embodiment, the configuration is not limited to this configuration. The trigger part 42 may be configured to be slidable as long as it is configured to be movable in the front-rear direction.

Although the embodiment mentioned above demonstrated the structure by which the pressure accumulation valve 30 was provided in the vertical supply cylinder part 20, it is not restricted to this structure. The pressure accumulation valve 30 may be provided in the nozzle member 11 or the like.
Although the embodiment mentioned above demonstrated the structure which uses the pressure accumulation valve 30 as a valve which switches connection and interruption|blocking of the ejection hole 11b and the inside of the cylinder 51, it is not restricted to this structure. The valve may be a check valve or the like that allows the flow of liquid from inside the cylinder 51 to the ejection hole 11b and restricts the flow of liquid from the ejection hole 11b into the cylinder 51. FIG.
In the embodiment described above, the configuration in which the inner lip portion 58 and the recessed portion 66 face each other when the piston 52 is at the rearmost position has been described, but the configuration is not limited to this. The inner lip portion 58 may be configured to face the recessed portion 66 when the piston 52 is at least in the rearmost position, and may face the recessed portion 66 when the piston 52 is forward of the rearward end position.

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

1: trigger type liquid ejector 10: ejector main body 11: nozzle member 11b: ejection hole 14: trigger mechanism 20: vertical supply tube portion 20f: connection hole 20m: first hole 20n: second hole 24: ejection tube portion 30 : Accumulator valve 32: Piston 41: Valve body 42: Trigger portion 51: Cylinder 52: Piston 56: Piston main body 58: Inner lip portion (lip portion)
65: Communication path 66: Recess A: Container body

Claims (3)

an ejector body attached to a container body in which the liquid is stored;
a nozzle member provided at the front end of the ejector body and formed with an ejection hole for ejecting the liquid forward;
The ejector body is
a vertical supply tube portion extending in the vertical direction;
A trigger portion is provided in front of the vertical supply tube portion so as to be movable rearward in a forwardly biased state, and liquid is directed from the vertical supply tube portion toward the ejection hole by moving the trigger portion rearward. and a trigger mechanism to circulate,
The trigger mechanism is
a piston that moves back and forth in conjunction with the back and forth movement of the trigger part;
a cylinder into which the piston is slidably inserted in the longitudinal direction;
a valve body that moves back and forth in conjunction with the back and forth movement of the piston to switch between communication and cutoff between the container body and the cylinder through the vertical supply cylinder,
The ejector body includes
a first hole through which the liquid in the cylinder passes toward the vertical supply tube portion when the piston moves backward;
a second hole that is closed by the valve body when the piston moves backward and is opened when the piston moves forward, thereby allowing the liquid in the container body to flow into the cylinder through the vertical supply cylindrical portion; formed,
The piston is
a capped cylindrical piston body into which the valve body is inserted;
a lip portion protruding inward from the piston body and capable of slidably contacting the outer peripheral surface of the valve body;
The valve body has
a communicating passage that communicates between the inside of the piston body and the second hole;
a recessed portion that forms a gap between the piston and the valve body for communicating the inside of the cylinder with the communication passage by facing the lip portion at least when the piston is at the rearmost end position; A trigger-type liquid ejector that is formed. The ejector body is provided with a connection hole that connects between the ejection hole and the vertical supply cylinder,
The ejector main body is provided so as to be able to contact and separate from the opening edge of the connection hole while being biased toward the connection hole. 2. The trigger-type liquid ejector according to claim 1, further comprising an accumulator valve for switching between communication and disconnection. The ejector body includes an injection cylinder portion extending forward from an upper end portion of the vertical supply cylinder portion and disposed between the nozzle member and the vertical supply cylinder portion,
The connection hole connects the inside of the vertical supply cylinder portion and the inside of the injection cylinder portion,
3. The trigger-type liquid ejector according to claim 2, wherein the pressure accumulator valve is provided in the vertical supply cylinder portion so as to be movable downward while being biased upward.

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