阅读说明：本技术 扳机式喷雾器 (Trigger type sprayer ) 是由 古泽正弘 于 2019-09-20 设计创作，主要内容包括：具备：外筒部,其安装在容器主体上,该容器主体用于收容金属腐蚀性的液体并具有开口部；缸主体,其设置在外筒部,并且外周壁与外筒部的内周壁具有间隙地配置,在底板上具有与流路侧连接的孔部；活塞,其使前端朝向缸主体滑动自如地插拔；手动杆,其安装在比活塞的滑动部件更靠基端侧,使活塞往复运动；凸缘部,其设置在活塞的基端侧；螺旋弹簧,其配置在凸缘部与缸主体的扩径部的前端部之间,对活塞向从缸主体脱离的方向施力；通过具备密封垫,该密封垫在轴向上分离地嵌入活塞的前端部的基端侧,并且其外周面相对于缸主体的内壁面滑动自如地安装,从而长时间地维持气密性·液密性,防止液体与金属制部件接触,使部件长寿命化,确保长期的可靠性。(The disclosed device is provided with: an outer cylinder section attached to a container body having an opening for receiving a corrosive liquid of a metal; a cylinder main body provided in the outer cylinder portion, having an outer peripheral wall arranged with a gap from an inner peripheral wall of the outer cylinder portion, and having a hole portion connected to the flow path side in the bottom plate; a piston having a tip end slidably inserted into and removed from the cylinder main body; a manual lever that is attached to the base end side of the sliding member of the piston and reciprocates the piston; a flange portion provided on a base end side of the piston; a coil spring disposed between the flange portion and a front end portion of the enlarged diameter portion of the cylinder body, and biasing the piston in a direction of separating from the cylinder body; the seal is fitted to the base end side of the distal end portion of the piston so as to be separated in the axial direction, and the outer peripheral surface of the seal is slidably attached to the inner wall surface of the cylinder body, whereby airtightness and liquidtightness are maintained for a long time, contact between a liquid and a metal member is prevented, the life of the member is prolonged, and long-term reliability is ensured.)

1. A trigger sprayer is provided with:

a container having an opening for containing a liquid;

a mounting part detachably mounted on the opening of the accommodating container;

a suction pipe having a tip end extending from the mounting portion into the accommodating container;

a flow path provided in the mounting portion and to which the other end side of the suction pipe is connected;

an outer tube portion provided integrally with the mounting portion and having a bottom side facing the flow path;

a cylinder portion that is provided coaxially with the outer cylinder portion and is insertable into and removable from the outer cylinder portion, and has an outer peripheral wall that is disposed with a gap from an inner peripheral wall of the outer cylinder portion, and an opening portion that is connected to the flow path side at a bottom portion;

a piston which is inserted and removed in a manner that a front end portion with an enlarged diameter is slidable toward the bottom of the cylinder portion;

an annular gasket fitted to a proximal end side of a distal end portion of the piston so as to be separated in an axial direction, having an outer peripheral surface slidably attached to an inner wall surface of the cylinder portion, and made of the same material as the piston;

a manual lever attached to a base end side of the piston to reciprocate the piston;

a flange portion provided on a base end side of the piston;

a coil spring disposed between the flange portion and a distal end portion of the cylinder portion, and biasing the piston in a direction of separating from the cylinder portion;

an air flow path provided in the mounting portion and communicating between the storage container and the outer cylinder portion;

a nozzle connected to the flow path.

2. A trigger sprayer is provided with:

a container for containing liquid and having an opening;

a mounting part detachably mounted on the opening of the accommodating container;

a suction pipe having a tip end extending from the mounting portion into the accommodating container;

a flow path provided in the mounting portion and to which the other end side of the suction pipe is connected;

an outer tube portion provided integrally with the mounting portion and having a bottom side facing the flow path;

a cylinder portion that is provided coaxially with the outer cylinder portion and is insertable into and removable from the outer cylinder portion, and has an outer peripheral wall that is disposed with a gap from an inner peripheral wall of the outer cylinder portion, and an opening portion that is connected to the flow path side at a bottom portion;

a piston which is inserted and removed in a manner that a front end portion with an enlarged diameter is slidable toward the bottom of the cylinder portion;

an annular gasket inserted into a proximal end side of the distal end portion of the piston so as to be separated in the axial direction, having an outer peripheral surface slidably attached to an inner wall surface of the cylinder portion, and made of the same material as the piston;

a manual lever attached to a base end side of the piston to reciprocate the piston;

a flange portion provided on a base end side of the piston;

a coil spring disposed between the flange portion and a distal end portion of the cylinder portion, and biasing the piston in a direction of separating from the cylinder portion;

an air flow path provided in the mounting portion and communicating between the storage container and the outer cylinder portion;

a nozzle connected to the flow path.

3. The trigger sprayer of claim 1 or 2,

a lubricant is sealed between the distal end portion, the gasket, and the inner wall surface of the cylinder portion.

4. The trigger sprayer of claim 1 or 2,

the cylinder portion is provided with a hole portion penetrating from the outer wall side to the inside.

5. The trigger sprayer of claim 4,

the hole portion is located between the front end portion of the piston and the gasket when the front end portion is farthest from the bottom of the cylinder portion.

6. The trigger sprayer of claim 1 or 2,

the liquid is metal corrosive liquid, and the spiral spring is made of metal materials.

7. The trigger sprayer of claim 1 or 2,

the material of the cylinder part is glass fiber reinforced plastic,

the piston and the sealing gasket are made of polyethylene.

8. The trigger sprayer of claim 1 or 2,

the gasket is integrally formed of a small diameter portion and a large diameter portion having different outer diameters.

Technical Field

The present invention relates to a trigger sprayer suitable for spraying a corrosive liquid such as a strong acid or a strong alkali having a property of corroding metals, a sodium hypochlorite solution, or the like.

Background

When a liquid such as water or a detergent is sprayed using a sprayer, a pressurized sprayer having a pump mechanism is known to pressurize the liquid contained in a container. As a mechanism for operating the pump mechanism, a trigger type mechanism or the like is generally used (for example, refer to Japanese patent laid-open publication Nos. 2012 and 157817 and 2000 and 176332). The trigger type device uses a spring made of a metal material such as stainless steel to return the piston or trigger to an original position by the spring.

Fig. 12 is a longitudinal sectional view showing an example of the trigger sprayer 100. The trigger sprayer 100 includes: a container 120 made of a resin material, which contains a corrosive liquid L; a trigger type pressurizing structure (manual pressurizing structure) 130 detachably attached to an upper portion of the storage container 120.

The storage container 120 includes: a container body 121 that contains a corrosive liquid L; and an opening 122 provided in the container body 121 and having a male screw 122a formed on an outer peripheral portion thereof.

The trigger type pressurizing structure 130 includes: a mounting portion 140 detachably mounted on the container body 121; a pressurizing pump 150 integrally provided at an upper portion of the mounting portion 140; a manual lever 160 that drives the pressurizing pump 150; and a discharge head 170 integrally provided at an upper portion of the pressure pump 150.

A lower protrusion 131 is formed at the lower portion of the trigger type pressurizing structure 130, and a male screw 131a is formed at the outer circumference thereof.

The mounting portion 140 is provided with a cylindrical large-diameter mounting large-diameter portion 141 and a cylindrical small-diameter mounting small-diameter portion 142. An internal thread 141a to be screwed with the external thread 122a is formed on an inner wall surface of the large attachment diameter portion 141.

A tubular tube support portion 143 is fitted into the mounting small diameter portion 142. A female screw 143a is formed on the inner periphery of the pipe support 143 and is screwed with the male screw 131a of the lower protrusion 131. Further, a sleeve 143b is formed at a lower portion of the pipe support portion 143. The proximal end side of the suction pipe 144 is inserted into the sleeve 143b so as to be removable. The front end side of the suction pipe 144 is inserted into the container body 121. The mounting small diameter portion 142 is formed with a small diameter air flow path 142 a. The air flow path 142a communicates with the inner surface of the outer cylinder 151 described later and directly communicates with the outside.

A ball valve 145 is disposed on the upper portion of the sleeve 143 b.

The pressure pump 150 has an outer cylinder portion 151, the outer cylinder portion 151 having a cylindrical space, and a cylinder portion 152 formed in the outer cylinder portion 151 from the right end side in fig. 12. The axial length of the cylinder portion 152 is formed to be approximately 1/2 times the axial length of the outer cylinder portion 151. The outer tube 151 has a large inner diameter at the left end opening in fig. 12, and has a step 153 formed therein.

A piston 154 is inserted into the outer cylinder 151 so as to be freely insertable and removable. The piston 154 is formed by combining a shaft 155 formed in a bottomed cylindrical shape whose left end side is closed in fig. 12, a hollow slide member 156 whose base end side is inserted into a hollow portion of the shaft 155 and whose tip end side slides on an inner wall surface of the cylinder portion 152, and a spacer 157 inserted into the slide member 156.

A flange portion 155a is formed on the outer periphery of the left end of the shaft 155 in fig. 12. A coil spring 158 is mounted between the flange portion 155a and the stepped portion 153. The coil spring 158 urges the piston 154 leftward in fig. 12. Further, a recess 155b is formed in the left end surface of the shaft 155 in fig. 12. An action end 162 of a manual lever 160 described later is swingably in contact with the recess 155 b.

On the left side of the pressure pump 150 in fig. 12, a manual lever 160 is provided. The manual lever 160 is configured such that a swing shaft is provided to the discharge head 170, and the push operation end 161 swings in the direction of arrow P in fig. 12 between the expansion position and the clamping position (see fig. 1). The manual lever 160 is provided with an action end 162, and the tip of the action end 162 is swingably in contact with the recess 155 b.

The discharge head 170 includes a head main body 171 formed in a horizontally long shape and integrated with the upper portion of the outer cylinder 151. Inside the head main body 171, a flow path 172 for the liquid L is formed. The lower end of the flow path 172 communicates with the upper end of the tube support 143. A nozzle structure 180 is detachably attached to the head main body 171.

A check valve 184 is provided on the distal end side of the flow passage 172, and is biased in a direction to close the flow passage 172 by a compression coil spring. Thereby, the liquid L pressurized by the pressurizing pump 150 and reaching the distal end portion of the flow path 172 passes toward the nozzle 183 described later. The check valve 184 prevents the liquid L passing through the nozzle 183 from flowing back into the flow path 172.

The nozzle structure 180 includes a cylindrical nozzle body 181, a nozzle flow path 182 formed in the nozzle body 181, and a nozzle 183 attached to the tip of the nozzle flow path 182.

In the trigger sprayer 100 configured as described above, the operation of grasping the manual lever 160 and the operation of releasing the manual lever 160 are repeated to operate the pressure pump 150, whereby the liquid L is sucked from the container body 121, pressurized, and discharged from the nozzle 183 to the outside. The portion of the liquid L that decreases from the inside of the container body 121 takes in air from the outside through the air flow path 142a and the outer tube 151. Since the diameter of the air flow path 142a is extremely small, the liquid L does not flow out from the air flow path 142a in a large amount even if the container body 121 is inclined.

Disclosure of Invention

The sprayer having the trigger type pressurizing structure has the following problems.

That is, when the liquid L is a sodium hypochlorite solution or a liquid having a strong acid or strong alkali property and a property of corroding metals (hereinafter, referred to as "metal corrosive liquid"), as shown in fig. 12, when the container body 121 is inclined from the air flow path 142a, the liquid L slightly flows out to the outer cylinder 151, and the coil spring comes into contact with the metal corrosive liquid during use. Therefore, corrosion gradually progresses, and eventually, the metal film is broken. Therefore, there is a problem that the sprayer is difficult to extend in life.

On the other hand, although a structure in which the spring is provided at a position away from the pump mechanism or in a sealed space may be considered, there are problems in that the length and diameter of the spring become large and the life becomes short, the pump mechanism becomes complicated, and the nebulizer becomes large.

Further, in order to prevent the liquid sucked into the cylinder from leaking to the coil spring side, it is also conceivable to add an O-ring (made of rubber material) to the front end side of the piston to improve the air-tightness and liquid-tightness.

Accordingly, an object of the present invention is to provide a trigger sprayer which can prevent a liquid such as a corrosive metal liquid from coming into contact with a metal member such as a spring by maintaining airtightness and liquid tightness for a long time, thereby prolonging the life of the member and ensuring long-term reliability.

The trigger sprayer of the present embodiment includes: a container for containing liquid and having an opening; a mounting part detachably mounted on the opening of the accommodating container; a suction pipe having a tip end extending from the mounting portion into the accommodating container; a flow path provided in the mounting portion and to which the other end side of the suction pipe is connected; an outer tube portion provided integrally with the mounting portion and having a bottom side facing the flow path; a cylinder portion that is provided coaxially with the outer cylinder portion and is insertable into and removable from the outer cylinder portion, and has an outer peripheral wall that is disposed with a gap from an inner peripheral wall of the outer cylinder portion, and an opening portion that is connected to the flow path side at a bottom portion; a piston which is inserted and removed in a manner that a front end portion with an enlarged diameter is slidable toward the bottom of the cylinder portion; an annular gasket fitted to a proximal end side of a distal end portion of the piston so as to be separated in an axial direction, having an outer peripheral surface slidably attached to an inner wall surface of the cylinder portion, and made of the same material as the piston; a manual lever attached to a base end side of the piston to reciprocate the piston; a flange portion provided on a base end side of the piston; a coil spring disposed between the flange portion and a distal end portion of the cylinder portion, and biasing the piston in a direction of separating from the cylinder portion; an air flow path provided in the mounting portion and communicating between the storage container and the outer cylinder portion; a nozzle connected to the flow path.

According to the present invention, by maintaining airtightness and liquid tightness for a long time, it is possible to prevent a liquid such as a corrosive metal liquid from coming into contact with a metal member such as a spring, thereby prolonging the life of the member and ensuring long-term reliability.

Drawings

Fig. 1 is a longitudinal sectional view showing a trigger sprayer according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing a state before pressurization of the pressurization pump assembled in the trigger sprayer.

Fig. 3 is a cross-sectional view showing a state before pressurization of the pressurization pump.

Fig. 4 is a vertical sectional view showing a pressurized state of the pressure pump.

Fig. 5 is a cross-sectional view showing a pressurized state of the pressurizing pump.

Fig. 6 is a side view showing a cylinder assembled in the pressure pump.

Fig. 7 is a cross-sectional view showing the cylinder.

Fig. 8 is a cross-sectional view showing a state before pressurization of a modification of the pressure pump.

Fig. 9 is a cross-sectional view showing a gasket assembled in the pressure pump.

Fig. 10 is a cross-sectional view showing a pressurized state of a modification of the pressure pump.

Fig. 11 is a cross-sectional view showing a gasket assembled in the pressure pump.

Fig. 12 is a longitudinal sectional view showing an example of the trigger sprayer.

Detailed Description

A trigger sprayer 10 according to an embodiment of the present invention will be described with reference to fig. 1 to 5. In the figure, L represents a sodium hypochlorite aqueous solution for sterilization, a strong acid, a strong alkali, or other corrosive liquid for metals. The components constituting the trigger sprayer 10 are made of a polyethylene-based synthetic resin material unless otherwise specified. The polyethylene synthetic resin material has high chemical resistance, is soft and has a long life. In addition, the price is low.

The trigger sprayer 10 includes: a receiving container 20 made of a resin material for receiving the liquid L; a trigger type pressurizing structure (manual operation pressurizing structure) 30 detachably attached to an upper portion of the storage container structure 20.

The storage container 20 includes: a container body 21 that contains a corrosive liquid L; and an opening 21 provided in the container main body 22 and having a male screw 122a formed on an outer peripheral portion thereof.

The trigger type pressurizing structure 30 includes: a mounting portion 40 detachably mounted on the container body 21; a pressurizing pump 50 integrally provided at an upper portion of the mounting portion 40; a manual lever 80 that drives the pressurizing pump 50; and a discharge head 90 integrally provided at an upper portion of the pressure pump 50.

The mounting portion 40 is provided with a cylindrical large-diameter mounting large-diameter portion 41 and a cylindrical small-diameter mounting small-diameter portion 42. An internal thread 41a to be screwed with the external thread 22a is formed on an inner wall surface of the large attachment diameter portion 41. An internal thread 42a is formed on an inner wall surface of the mounting small diameter portion 42.

A tubular tube support portion 43 is inserted into the mounting small diameter portion 42. The pipe support portion 43 has a male screw 43a formed on the outer periphery of the pipe support portion 43. Further, a sleeve 43b is formed inside the tube support portion 43. The proximal end side of the suction pipe 44 is inserted into the sleeve 43b so as to be removable. The suction pipe 44 is inserted into the container body 21 at its distal end side. As shown in fig. 2 and 4, a small-diameter air flow passage 42b is formed in the mounting small-diameter portion 42. The air flow path 42b communicates with the container main body 21, and a gap Sa between an inner peripheral surface of an outer tube portion 51 described later and an outer peripheral surface of the cylinder unit 60.

A ball valve 45 is formed at an upper portion of the sleeve 43 b. The ball valve 45 includes: a valve seat 45a formed on an inner wall surface of the sleeve 43 b; a flow hole 45b formed in the center of the valve seat 45 a; and a ball (valve body) 45c made of a ceramic material and disposed on the valve seat 45a and having a diameter larger than the inner diameter of the flow hole 45 b.

As shown in fig. 2 and 3, the pressure pump 50 has an outer cylinder 51 having a cylindrical space. A cylinder unit 60 and a piston unit 70 are attached in series and removably to the right end side in fig. 2 and 3 in the outer cylinder 51.

The axial length of the cylinder unit 60 is formed to be approximately 1/2 times the axial length of the outer cylinder portion 51. As shown in fig. 6 and 7, the cylinder unit 60 includes a cylindrical cylinder main body 61. A plurality of ribs (ribs) 62 are formed on the cylinder main body 61 along the outer circumferential direction. The rib 62 improves the strength of the cylinder main body 61, and has a function of forming a gap Sa between the outer peripheral surface of the cylinder main body 61 and the inner peripheral surface of the outer cylinder 51. In addition, the rib 62 holds an O-ring 63 and an O-ring 64.

In fig. 2, the left end side opening 61a of the cylinder main body 61 is provided with a diameter-enlarged portion 61b having a slightly larger inner diameter. The right end opening 61c of the cylinder main body 61 in fig. 2 is formed with a bottom plate 65. A small-diameter hole portion 65a is formed in the center of the bottom plate 65.

The bottom plate 65 has an engaging portion 67 projecting toward the flow path 92. The engagement portion 67 may be locked by a pin (not shown) so that the cylinder main body 61 does not fall off the outer cylinder 51.

As shown in fig. 3, 5, 6, and 7, air holes 69 are formed between the ribs 62 on the outer peripheral wall of the cylinder main body 61. The air hole 69 communicates the gap Sa with the inside of the cylinder main body 61.

The position of the air hole 69 is a position between the outer periphery of the packing 76 of the piston 71 and the outer periphery of the slide member 73 when the piston 71 is extended (the extended position where the manual lever is released by hand) (see fig. 3), and a position facing the outer periphery of the shaft 72 when the piston 71 is compressed (the clamped position where the manual lever is held) (see fig. 5). The outer peripheral surface of the shaft 72 is not fitted to the inner peripheral surface of the cylinder main body 61, and is not airtight. Therefore, a slight gap is formed between the outer peripheral surface of the shaft 72 and the inner peripheral surface of the cylinder main body 61, and air can flow therethrough.

With such a configuration, the air hole 69 is closed and opened in accordance with the expansion and compression operations of the piston 71. Specifically, when the piston 71 extends, nothing flows through the air hole 69. When the piston 71 is compressed, the outer peripheral side of the shaft 72 communicates with the gap Sa through the air hole 69, and the outside air enters the gap Sa through the air hole 69.

The cylinder main body 61 is formed of glass fiber reinforced plastic. The glass fiber reinforced plastic has excellent chemical resistance and durability.

The piston unit 70 is formed of polyethylene resin. The piston unit 70 is configured by a combination of a cylindrical piston 71, a shaft 72 formed in a bottomed cylindrical shape with the left end side of the piston 71 closed in fig. 2, a hollow slide member 73 with the base end side inserted into the hollow portion of the shaft 72 and the tip end side sliding on the inner wall surface of the cylinder main body 61, and a spacer 74 inserted into the inside of the slide member 73.

A flange portion 72a is formed on the outer periphery of the left end of the shaft 72 in fig. 2. A coil spring 75 is attached between the flange portion 72a and the enlarged diameter portion 61 b. The coil spring 75 biases the piston 71 leftward in fig. 2. Further, a recess 72b is formed in the left end surface of the shaft 72 in fig. 2. An action end 82 of a manual lever 80 described later is swingably in contact with the recess 72 b.

A rib 73a is formed on the sliding member 73 of the piston 71. The rib 73a can improve the air-tightness and liquid-tightness of the sliding member 73.

An annular seal 76 is fitted into the base end side of the sliding member 73 of the piston 71 with a slight gap therebetween. The gasket 76 has a small diameter portion 76a and a large diameter portion 76 b. The small diameter portion 76a of the seal 76 is located on the shaft 72 side, and the large diameter portion 76b is located on the sliding member 73 side. The gasket 76 is made of the same material as the piston 71, and is fixed by being press-fitted from the base end side. The outer peripheral surface of the gasket 76 is formed to be slidable in an airtight and liquid-tight manner with respect to the inner peripheral surface of the cylinder body 61. The gasket 76 is not twisted and does not deteriorate in sealing performance even when the reciprocating dimension is long and the reciprocating frequency is large, unlike an O-ring made of a rubber material.

Further, since the piston 71 is in contact with the inner wall surface of the cylinder main body 61 at two locations, the sliding member 73 and the gasket 76, which are axially separated, the stability during reciprocation is improved.

Further, a lubricant such as silicone oil may be sealed in the gap 77 between the sliding member 73, the gasket 76, and the inner wall surface of the cylinder main body 61. When the lubricant is sealed, the reciprocating motion of the piston 71 becomes smooth.

On the left side of the pressure pump 50 in fig. 2, a manual lever 80 is provided. The manual lever 80 is configured to have a swing shaft provided to the discharge head 90 and to swing in the direction of arrow P in fig. 1 between the deployed position (see fig. 2) and the clamped position (see fig. 4) by pressing the operation end 81. The manual lever 80 is provided with an operating end 82, and the tip of the operating end 82 is swingably in contact with the recess 72 b. In the grip position of the manual lever 80, as shown in fig. 2, the slide member 73 is close to the bottom of the cylinder unit 60, and the flange portion 72a does not abut against the outer cylinder portion 51.

The discharge head 90 includes a head main body 91 formed in a horizontally long shape and integrated with the upper portion of the outer cylinder portion 51. Inside the head main body 91, a flow path 92 for the liquid L is formed. The lower end of the flow path 92 communicates with the upper end of the tube support portion 43. A nozzle structure 95 is detachably attached to the head main body 91.

A check valve 99 is provided on the distal end side of the flow path 92 and is biased in a direction to close the flow path 92 by a compression coil spring. Thereby, the liquid L pressurized by the pressurizing pump 50 and reaching the distal end portion of the flow path 92 passes toward a nozzle 98 described later. The check valve 99 prevents the liquid L after passing toward the nozzle 98 from flowing back into the flow path 92.

The nozzle structure 95 includes a tubular nozzle body 96, a nozzle flow path 97 formed in the nozzle body 96, and a nozzle 98 attached to the tip of the nozzle flow path 97.

The trigger sprayer 10 configured as described above sprays the liquid L as follows. That is, the attachment large diameter portion 41 of the trigger type pressurizing structure 30 is detached from the container body 21, and the liquid L is put into the interior from the opening 22. Next, the mounting large diameter portion 41 is screwed and fixed to the container main body 21.

When the manual lever 80 of the trigger type pressurizing structure 30 is in the separated state (deployed position), the piston 71 is in a state of protruding from the cylinder unit 60 by the biasing force of the coil spring 75 as shown in fig. 2. At this time, the air hole 69 is closed by the outer periphery of the piston 71, and nothing flows through the air hole 69.

Then, when the manual lever 80 is gripped, as shown in fig. 4, the working end 82 pushes the recess 72b of the piston 71. Thereby, the piston 71 is inserted into the cylinder main body 61 against the urging force of the coil spring 75. The manual lever 80 is stopped at the grip position. At this time, the air in the cylinder unit 60 is discharged from the nozzle 98 to the outside through the flow path 92 and the nozzle flow path 97 without being directed toward the container main body 21 by the action of the ball valve 45.

At this time, as shown in fig. 5, the air hole 69 faces the outer periphery of the shaft 72. Therefore, the outer peripheral side of the shaft 72 communicates with the gap Sa, and the outside air enters the gap Sa through the air hole 69. Since the gap Sa communicates with the container main body 21, the inside of the container main body 21 is at atmospheric pressure.

When the manual lever 80 is released, the piston 71 projects from the cylinder main body 61 by the biasing force of the coil spring 75, and the inside of the cylinder main body 61 becomes negative pressure (sub-atmospheric pressure). Thereby, the ball valve 45 is opened, and the liquid L is sucked from the container main body 21 through the suction pipe 44 and introduced into the cylinder unit 60 through the flow path 92. The inside of the container main body 21 becomes negative pressure corresponding to the portion where the liquid L is reduced.

Then, when the manual lever 80 is gripped, the action end 82 pushes the recess 72b of the piston 71. Thereby, the piston 71 is inserted into the cylinder unit 60 against the biasing force of the coil spring 75, and pressurizes the liquid L. At this time, the liquid L is discharged from the nozzle 98 to the outside through the flow path 92 and the nozzle flow path 97 without being directed toward the container main body 21 by the action of the ball valve 45.

As described above, the outer peripheral side of the shaft 72 communicates with the gap Sa, and the outside air enters the gap Sa through the air hole 69. Since the inside of the container main body 21 is at a negative pressure, air flows in to become atmospheric pressure.

By repeating the operation of grasping and releasing the manual lever 80 (i.e., the reciprocation of the expansion position and the pinching position) in this manner, the liquid L can be intermittently discharged from the nozzle 98.

When the interior of the container main body 21 becomes negative pressure by discharging the liquid L, the liquid L is hard to flow out, and therefore, a discharged volume of air needs to be taken in from the outside. Since the air does not flow from the flow path 92 side by the action of the ball valve 45 as described above, the air is taken in from the outside through the air flow path 42b provided in the mounting small diameter portion 42 and the pressure pump 50. Since the diameter of the air flow path 42b is extremely small, the liquid L does not flow out from the air flow path 42b in a large amount even if the container main body 21 is inclined.

Next, a structure in which the coil spring 75 of the pressure pump 50 does not contact the liquid L will be described. If the liquid L is a metal corrosive liquid, the coil spring 75 may be corroded. In the trigger sprayer 10 in the standing state, the liquid L hardly flows into the pressurizing pump 50. On the other hand, when the container main body 21 is tilted, the liquid L sometimes slightly flows out through the air flow path 42 b. When the liquid L flows out from the container main body 21, the inside of the container main body 21 becomes a negative pressure, and thus the liquid L does not continuously flow out.

When a small amount of the liquid L flows out from the container main body 21 to the pressurizing pump 50 through the air flow path 42b, the liquid L reaches the gap Sa between the outer cylinder portion 51 and the cylinder unit 60. However, since the O-ring 64 is formed around the cylinder unit 60, the liquid L does not leak from the gap Sa to the coil spring 75 side, and the liquid L does not contact the coil spring 75.

On the other hand, when the liquid L is sucked from the container body 21 into the cylinder body 61, the liquid L is hermetically and liquid-tightly sealed by the sliding member 73 and the packing 76 in a double manner, and the amount of leakage to the coil spring 75 side can be minimized.

As described above, in the trigger sprayer 10 of the present embodiment, the diameter is reduced for the long life of the coil spring 75, and the axial length is shortened, and even when the coil spring is disposed around the piston 71, the O-ring 64 and the packing 76 can prevent contact with the liquid L, which is a corrosive liquid of metal, and the short life of the coil spring 75.

In addition, the sliding member 73 and the air hole 69 do not interfere with each other with the reciprocation of the piston 71. Therefore, the rib 73a of the slide member 73 does not get caught in the air hole 69, and the air-tightness and liquid-tightness of the slide member 73 can be maintained for a long period of time. The outer peripheral surface may deteriorate due to long-term use because the gasket 76 interferes with the air hole 69, but since the sliding member 73 is provided, the liquid L does not leak to the coil spring 75 side, and there is no problem in actual use. Further, since the packing 76 is fitted into the piston 71, it can be replaced.

Further, since the cylinder main body 61 can be formed of a glass fiber reinforced plastic having excellent chemical resistance and durability, the usability and durability are not deteriorated even when an inexpensive material is used for the other portions.

Fig. 8 to 11 are views showing a pressure pump 50A as a modification of the pressure pump 50 described above. In these drawings, the same reference numerals are given to the same functional parts as those in fig. 1 to 7, and detailed description thereof will be omitted.

As shown in fig. 8 to 11, an annular gasket 78 is disposed on the base end side of the sliding member 73 of the piston 71 with a slight gap therebetween. The seal 78 has a small diameter portion 78a and a large diameter portion 78 b. The gasket 78 is formed of the same shape and the same material as the gasket 76 (i.e., the same material as the piston 71). The direction of insertion of the gasket 78 is opposite to the direction of insertion of the gasket 76. That is, the small diameter portion 78a of the packing 78 is positioned on the sliding member 73 side, and the large diameter portion 78b is positioned on the shaft 72 side. The gasket 78 is inserted from the proximal end side, but is not fixed.

The outer peripheral surface of the gasket 78 is formed to be slidable in an airtight and liquid-tight manner with respect to the inner peripheral surface of the cylinder body 61. The packing 78 is not twisted and does not deteriorate in sealing performance even when the reciprocating dimension is long and the reciprocating frequency is large, unlike an O-ring made of a rubber material. Further, since the piston 71 is in contact with the inner wall surface of the cylinder main body 61 at two locations, the sliding member 73 and the packing 78, which are axially separated, the stability during reciprocation is improved.

The gasket 78 is not fixed unlike the gasket 76, and therefore moves according to the insertion position of the piston 71 with respect to the cylinder main body 61. That is, as shown in fig. 8 and 9, in the expanded position (before pressurization) before the manual lever 80 is gripped, the gasket 78 is positioned on the sliding member 73 side, and is sealed at two locations, between the outer peripheral surface of the small diameter portion 78a and the end surface of the sliding member 73, and between the outer peripheral surface of the large diameter portion 78b and the inner peripheral surface of the cylinder main body 61.

On the other hand, at the clamping position (pressurized state) where the manual lever 80 is gripped, the end surfaces of the large diameter portion 78b and the shaft 72, and two portions between the outer peripheral surface of the large diameter portion 78b and the inner peripheral surface of the cylinder main body 61 are sealed.

Further, a lubricant such as silicone oil may be sealed in the gap 77 between the sliding member 73, the gasket 78, and the inner wall surface of the cylinder main body 61. When the lubricant is sealed, the reciprocating motion of the piston 71 becomes smooth.

In the above-described embodiment, the metal corrosive liquid is exemplified as the liquid L, but the liquid L may be applied to a non-corrosive liquid such as a detergent or water other than the metal corrosive liquid.

The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit and scope thereof. Further, the respective embodiments may be combined as appropriate as possible, and in this case, the combined effect can be obtained. Further, the embodiments described above include inventions in various stages, and various inventions can be extracted by appropriate combinations of a plurality of disclosed constituent elements. For example, even if some of the constituent elements shown in the embodiments are deleted, the problems described in the section of the problems to be solved by the invention can be solved, and when the effects described in the section of the effects of the invention are obtained, the configuration in which the constituent elements are deleted can be extracted as the invention.