JP3720054B2 - Trigger type liquid dispenser - Google Patents

Description

[0001]
[Industrial application fields]
Technical field
The present invention relates to an improvement of a trigger type liquid ejector that is attached to an opening of a liquid container and used for ejecting a content liquid.
[0002]
[Prior art]
Background art
As a conventional trigger type liquid ejector that is attached to the opening of a liquid container and is used for ejecting the content liquid, the one proposed in US Pat. No. 4,819,835 shown in FIG. 33 is known.
[0003]
In the trigger type liquid discharger shown in the specification of US Pat. No. 4,819,835, as shown in FIG. 33, the pump section E is arranged in parallel with the horizontal discharge cylinder F.
[0004]
The trigger type liquid ejector shown in FIG. 33 is fixed to the opening of the liquid container by the container mounting portion 101, and when the trigger 102 is pressed in the direction of arrow J ', the pressing piece 103 is a laterally concave groove of the head 104 of the piston portion G. The piston I moves until the end face 106 contacts the bottom wall 107 of the cylinder H, and the liquid filled in the cylinder chamber 108 is pushed out from the liquid suction / discharge port 109 to the liquid passage 110. The discharge valve body 111 is pressed by the hydraulic pressure.
[0005]
The discharge valve body 111 moves upward by the elastic deformation of the elastic deformation portion 112 and opens the discharge valve seat 113, so that the liquid flows from the discharge valve chamber 114 into the flow path 115 in the discharge cylinder F, and from the flow path 116 to the liquid After passing through the shallow groove M between the guide L and the short cylinder portion K of the nozzle head J, the flow reaches the flow path 117 which is a spin groove, and is discharged from the discharge port 118.
[0006]
During this time, the piston I compresses the spring 119 provided therein, and the hydraulic pressure in the flow path 110 presses the ball valve 120 against the suction valve seat 121.
[0007]
When the trigger 102 is released after the liquid discharge from the discharge port 118 is completed, the piston I returns to the position shown in FIG. 33 due to the restoring elasticity of the spring 119, and the cylinder chamber 108 expands. Since this negative pressure acts on the discharge valve body 111 and the ball valve 120, the discharge valve body 111 is in close contact with the discharge valve seat 113 and closes the valve seat 113, and the ball valve 120 is in the suction valve seat 121. Therefore, the liquid in the liquid container fills the cylinder chamber 108 from the suction pipe 122 via the liquid passage 110 and the port 109 to prepare for the next discharge.
[0008]
An intake port 123 is formed in a part of the peripheral wall of the cylinder H, and the intake port 123 communicates with the liquid container to which the container mounting portion 101 is fixed by air passages 124 and 125.
[0009]
The piston I has an annular skirt 126 extending to the stroke end side, that is, the bottom wall 107 side of the cylinder H, and an annular skirt 127 extending to the approach end side, that is, the opening side of the cylinder H. Is in close contact with the inner wall of the cylinder.
[0010]
At the stroke end where the end face 106 is in contact with the bottom wall 107 of the cylinder H, the end edge 128 of the annular skirt 127 on the approach end side occupies a position closer to the bottom wall 107 beyond the intake port 123 of the cylinder H. At this time, when the intake port 123 communicates with the opening 129 of the cylinder H opened to the atmosphere and air is introduced into the liquid container, and the piston I is at the approach end shown in FIG. 33, The intake port 123 is closed between the annular skirts 126 and 127, and is designed to prevent leakage from the intake port 123 when the liquid container falls.
[0011]
The trigger type liquid ejector having the structure shown in the specification of US Pat. No. 4,819,835 described above is a normal liquid as long as the user operates the trigger 102 to reliably move the piston I from the stroke end to the approach end. The discharge state is maintained.
[0012]
In FIG. 33, the symbol N indicates a lid piece of the discharge port 117 portion, and the symbol O indicates an attachment shaft of the lid piece N.
[0013]
[Problems to be solved by the invention]
The trigger type liquid discharger shown in the specification of US Pat. No. 4,819,835 has a good liquid discharge and a good productivity, but the liquid pressure from the cylinder chamber 108 to the discharge port 118 at the time of discharge. As shown schematically in FIG. 34, the flow path 117, which is a shallow groove M and a spin groove, for a period of time TS after the piston I starts moving from the approach end toward the stroke end, as shown in FIG. The internal fluid pressure PS does not rise to such an extent that complete ejection can be realized, and even if the discharge is stopped when the piston I reaches the stroke end, the port 109, the fluid passage 110, and the discharge valve chamber 114 from the cylinder chamber 108. For example, the residual pressure PE exists for a time TE after stopping the discharge.
[0014]
For this reason, there is a problem that some liquid dripping occurs when discharging from the discharge port 118 is started and when discharging is stopped, and there is a problem that large bubbles with poor foaming are discharged when bubbles are ejected. .
[0015]
Summary of the Invention
Therefore, in the trigger type liquid ejector of the type shown in FIG. 33, the present invention does not cause any dripping from the discharge port at the initial stage of the trigger operation and at the end of the operation, and exhibits a complete liquid discharge function. It is an object of the present invention to provide a trigger type liquid ejector.
[0016]
[Means for Solving the Problems]
For this purpose, the invention of claim 1TheProvided with a valve structure that opens when the liquid reaches the normal discharge pressure upstream of the discharge port of the Riga type liquid discharger, and the liquid pressure that returns the residual pressure in the liquid passage to the pump mechanism An escape mechanism is provided to prevent liquid dripping at the start and end of liquid discharge.
[0017]
ContractScope of request2In the invention of claim 1, in addition to the invention of claim 1, it is configured to prevent unnecessary decompression in the container due to the backward movement of the pump mechanism.
[0018]
The scope of the claims3In the invention ofTheThe residual pressure from the liquid flow path to the pump mechanism is removed by utilizing the outer peripheral surface of the inner cylinder portion which is a spring receiver provided in the cylinder of the pump mechanism.
[0019]
The scope of the claims4In the invention ofTheBy releasing the residual pressure of the pump mechanism using a liquid flow path outside the pump mechanism, the degree of freedom in designing the structure for introducing air into the container is increased.
[0020]
The scope of the claims5In this invention, the pump mechanism for pumping the liquid from the container into the liquid discharger is provided with a liquid pressure relief mechanism for returning the residual pressure in the flow passage into the container, and the liquid from the discharge port due to the residual pressure at the end of the liquid discharge is provided. It was set as the structure which prevents dripping.
[0021]
The scope of the claims7In the present invention, the valve structure used in the invention of claim 1 has a structure that can be easily molded.
[0022]
The scope of the claims8In the invention of claim7In addition to the invention, the residual pressure from the liquid flow path to the pump mechanism is removed by utilizing the outer peripheral surface of the inner cylinder portion which is a spring receiver provided in the cylinder of the pump mechanism.
[0023]
The scope of the claims9In the invention of claim7In addition to this invention, the degree of freedom in designing the structure for introducing air into the container is increased by releasing the residual pressure of the pump mechanism by using a liquid flow path outside the pump mechanism.
[0024]
The scope of the claims10In this invention, allowable dimensional errors such as cylinders and pistons of the pump mechanism do not affect the removal of the residual pressure from the pump mechanism.
[0025]
The scope of the claims6,The scope of the claims11And claims12In each of the inventions, a trigger type liquid discharger corresponding to various usage conditions can be obtained by various combinations of the inventions of the valve structure and the pump mechanism..
[0026]
[Preferred Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, the mechanism and operation of the trigger type liquid ejector other than the nozzle head portion and the pump mechanism are substantially the same as those of the conventional trigger type liquid ejector shown in FIG. Reference is made to the description of the liquid ejector, and the same reference numerals in FIGS. 1 to 32 denote the same structural parts.
[0027]
1 to 8 areTrigger type liquid ejector used in the present inventionThe nozzle head portion 1 is shown in an enlarged manner, and the nozzle head portion 1 is composed of a nozzle head 2, a liquid guide 3, a spin element 4, and a nozzle chip 6 having a discharge port 5.
[0028]
The nozzle head 2 has a valve seat 8 in the liquid flow path 7 upstream from the discharge port 5, and the liquid flow path 7 communicates with the liquid flow path 115 of the discharge cylinder F by the liquid flow path 9. Yes.
[0029]
As shown in FIGS. 4 to 7, the liquid guide 3 includes a valve body 10 that is in close contact with the valve seat 8 and closes the liquid flow path 7, and a pressure receiving cylinder portion that is molded integrally with the valve body 10. 11, a fixing part 12 fixed to the spin element 4, and a spring member 13 that connects the valve body 10 and the pressure receiving cylinder part 11 to the fixing part 12.
[0030]
As clearly shown in FIGS. 5 and 7, the pressure-receiving cylinder portion 11 has a pressure-receiving surface portion 14 that receives the liquid pressure toward the upstream side of the liquid flow path 7.
[0031]
Further, as shown in FIG. 5 to FIG. 8, the tube portion 15 that connects the valve body 10 and the pressure receiving tube portion 11 is provided with a fenestration portion 16 that communicates with the liquid flow path 9. As shown in the figure, when the valve body 10 is in close contact with the valve seat 8 and shuts off the liquid flow path 7 and the liquid flow path 9, the liquid pressure can be applied to the pressure receiving surface portion 14. Yes.
[0032]
The cylindrical portion 15 is integrally formed with a guide cylinder 17 extending toward the liquid flow path 9, and the guide cylinder 17 is a guide protruding from the spin element 4 toward the liquid flow path 7. The cylinder 18 is inserted into the inner surface of the cylinder 18 so as to be slidable with a slight sliding resistance, and is configured so that the valve body 10 can always move forward and backward with respect to the valve seat 8 in a correct posture. Is arranged in an annular space 4C between the guide cylinder 18 of the spin element 4 and the outer cylinder part 4B.
[0033]
As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 8, the nozzle head 2 has a recess 19 for fitting and fixing the nozzle tip 6 on the front end surface, and this portion is a spin groove. The nozzle tip 6 is fitted, leaving the flow path 20.
[0034]
In the figure, reference numeral 21 denotes a fitting hole of the shaft O of the lid piece N shown in FIG.
[0035]
The nozzle head 2 is formed with an annular groove 2A into which the annular portion 4A at the tip of the spin element 4 is fitted, and an annular groove 2B into which the pressure receiving cylinder portion 11 is closely and slidably fitted.
[0036]
The nozzle head 2 has a liquid guide 3 incorporated therein and is fixed with an undercut structure 2D by fitting an outer cylinder portion 2C to a spin element 4 that is fitted and fixed in advance to a discharge cylinder F. Yes, assembly workability can be improved.
[0037]
In the illustrated nozzle head portion 1, the valve body 10 is elastically contacted with the valve seat 8 by the hydraulic pressure acting on the horizontal projection area within the range indicated by the symbol X in FIG. 1 and the elastic pressure of the spring member 13. It has been made.
On the other hand, the pressure receiving cylinder portion 11 is subjected to elastic pressure toward the upstream side of the liquid flow path by the liquid pressure acting on the horizontal projection area of the pressure receiving surface portion 14.
[0039]
Therefore, the hydraulic pressure when the normal discharge hydraulic pressure acts on the horizontal projection area of the pressure receiving surface portion 14 is the normal pressure of the normal discharge hydraulic pressure acting on the horizontal projection area of the valve body 10 and the spring member 13. If the horizontal projection area of the pressure receiving area 14 is selected so as to be larger than the sum of the elastic pressures, the valve body 10 is instantaneously opened when the hydraulic pressure becomes the normal discharge hydraulic pressure. Become.
[0040]
For this reasonAs shown in FIG. 1 to FIG.According to the invention, in FIG. 34, when the hydraulic pressure reaches the normal discharge hydraulic pressure Y, the valve body 10 is opened, and the liquid is discharged as indicated by the arrow Z in FIG. When the pressure drops below Y, the valve body 10 is closed, and liquid dripping from the discharge port 5 at the start and end of discharge due to insufficient fluid pressure can be prevented.
[0041]
9 to 15 areDifferent from those shown in FIGS.The nozzle head part 201 of FIG.As shown in FIG. 1 to FIG.In the example, the liquid guide 3 is an integral structure.As shown in FIGS.In the example, the liquid guide 203 has a large structural difference in that it is composed of two members, an outer body 222 having the valve body 210 and an inner body 223.
[0042]
The structure of the nozzle head 202 including the nozzle tip 206 is as follows:As shown in FIG. 1 to FIG.Same structure as the example.
[0043]
As shown in FIGS. 10, 11, and 12, the outer body 222 of the liquid guide 203 includes a valve body 210, a pressure receiving cylinder portion 211, a fixing portion 212 to the spin element 204, a spring member 213, , And a guide tube 217.
[0044]
The valve body 210 blocks the liquid channel 207 on the nozzle chip 206 side and the liquid channel 209 on the upstream side.
[0045]
The spring member 213 connects the fixing portion 212 to the valve body 210, the pressure receiving cylinder portion 211, and the guide cylinder 217.
[0046]
In the guide tube 217, an inner body 223 shown in FIGS. 13 and 14 is fitted and fixed. The inner body 223 includes a head 224, a flange portion 225, and a sliding cylinder 226.
[0047]
The head 224 is press-fitted into a cylindrical portion 215 extending from the valve body 210 of the outer body 222 to the upstream side of the liquid flow path.
[0048]
The flange portion 225 is press-fitted into the guide tube 217.
[0049]
The sliding cylinder 226 is inserted into the guide cylinder 218 of the spin element 204 so that it can slide in the axial direction with a slight sliding resistance.
[0050]
The head 224 has a through hole 227 formed in the center thereof, and a concave groove 229 is formed in the head end 228 in the radial direction.
[0051]
In the cylindrical portion 215 of the outer body 222, a window hole 230 is opened in the radial direction in the same phase as the concave groove 229 opened in the radial direction of the head 224 of the inner body 223. .
[0052]
On the other hand, a guide hole 231 extending from the valve seat 208 of the nozzle head 202 to the upstream side of the liquid flow path is also provided with a window hole 232 in the same phase as the window hole 230 in the radial direction.
[0053]
With the above structure, the liquid flow path 233 of the discharge cylinder F passes from the port 234 of the spin element 204 to the liquid flow path 209, the lumen 226A of the sliding cylinder 226 of the inner body 223, the through hole 227, the concave groove 229, the window Via the hole 230 and the window hole 232, it communicates with the annular groove 222 </ b> B on the front surface of the pressure receiving surface 214 of the pressure receiving cylinder portion 211 of the outer body 222.
[0054]
Of the structureAs shown in FIGS.Also in the example, the valve body 210 is elastically contacted with the valve seat 208 by the elastic pressure of the spring member 213 and the hydraulic pressure acting on the horizontal projection cross section of the inner body 223 facing the liquid flow path 209, and at the same time the liquid flow path The hydraulic pressure in 209 acts on the pressure receiving surface 214 of the pressure receiving cylinder portion 211 of the outer body 222 and presses the outer body 222 toward the upstream side of the liquid flow path.
[0055]
For this reason, when the liquid reaches the normal discharge liquid pressure, the pressing force acting on the pressure receiving surface 214 acts on the elastic pressure of the spring member 213 and the horizontal projection section of the inner body 223 facing the liquid flow path 209. If the dimensions of each part are selected so as to be larger than the sum of the hydraulic pressure and the hydraulic pressure to be applied, as shown in FIG. The body 210 is separated from the valve seat 208, the liquid flow path 209 communicates with the liquid flow path 207 downstream of the valve seat 208, and the liquid is discharged from the discharge port 205 of the nozzle chip 206.
[0056]
At the moment when the hydraulic pressure falls below the normal discharge hydraulic pressure, the valve body 210 comes into close contact with the valve seat, and the discharge stops,As shown in FIG. 1 to FIG.Like the example, no dripping or the like occurs.
[0057]
Explained aboveAs shown in FIGS.In the example, the liquid guide 203 has an inner body 223 fitted in an outer body 222 having a valve body 210, and the opening of the sliding cylinder 226 of the inner body 223 faces the liquid flow path 209. Therefore, the horizontal projection cross section of the sliding cylinder 226, that is, the horizontal projection cross section of the sliding cylinder 226 within the range indicated by the arrow S in FIG. 9 and FIG.As shown in FIG. 1 to FIG.The area can be made significantly smaller than the horizontal projected cross-sectional area of the corresponding portion of the example, and therefore the horizontal projected cross-sectional area of the sliding cylinder 226 and the horizontal projected cross-sectional area of the pressure receiving surface 214 of the pressure receiving cylinder portion 211 can be compared. Can be great.
[0058]
For this reason, initial priming at the start of use, that is, the operation of discharging the air in the liquid cylinder and sucking up the liquid by the reciprocating motion of the initial liquid piston can be completed in a short time.
[0059]
Further, since the valve body 210 can be opened by only air pressure at the time of initial priming, thisAs shown in FIGS.In the case of the example, the discharge valve body 111 shown in FIG. 33 can be omitted.
[0060]
16 to 19 show the scope of the claims.5The pump part according to the first embodiment of the present invention is shown as an enlarged longitudinal section, and the pump part 22 is composed of a cylinder 23 and a piston 24.
[0061]
The cylinder 23 includes an outer cylinder part 25 that cooperates with the piston 24 and an inner cylinder part 27 in which a spring 26 for returning the piston 24 is housed.
[0062]
A cylinder chamber 28 is provided between the outer cylinder portion 25 and the inner cylinder portion 27, and the cylinder chamber 28 is a liquid suction and discharge port 30 provided in the bottom wall 29 and has a ball valve 120 serving as a check valve. It communicates with the liquid passage 110.
[0063]
A plurality of short and shallow grooves 32 that run in the busbar direction are formed in the inner peripheral wall 31 portion that is in contact with the bottom wall 29 of the outer cylindrical portion 25.
[0064]
The short shallow groove 32 in the illustrated example is recessed in the inner peripheral wall 31, but two low protrusions that run in the direction of the bus line adjacent to the inner peripheral wall 31 may be provided, and the short shallow groove may be formed between the protrusions.
[0065]
An intake port 123 for introducing outside air into the container to which the trigger type liquid ejector is attached is opened at a position in the vicinity of the bottom wall 29 of the outer cylinder portion 25, and the outer cylinder portion 25 is introduced from the intake port 123. In the position close to the opening 129, a plurality of outside air introduction shallow grooves 33 running in the direction of the bus are recessed.
[0066]
The short shallow groove 32 in the illustrated example is formed short in the busbar direction and relatively long in the circumferential direction.
[0067]
The piston 24 has a thick end at the stroke end side, i.e., the bottom wall 29 side of the cylinder 23, and extends to the stroke end side at both inner and outer peripheral edges, and the inner peripheral wall 31 of the outer cylindrical portion 25 and the inner cylinder Annular skirts 35 and 36 are formed in close contact with the outer peripheral wall 34 of the portion 27.
[0068]
An annular skirt 37 that extends toward the approach end side and is in close contact with the inner peripheral wall 31 of the outer cylinder portion 25 is formed on the peripheral edge of the thick portion on the approach end side.
[0069]
As shown in FIG. 19, the interval between the annular skirt 35 and the annular skirt 37 is the position where the annular skirt 35 rides on the short shallow groove 32, and the annular skirt 37 is the opening of the outer cylinder portion 25 of the intake port 123. The gap is selected so that it can be in close contact with the inner peripheral wall 31 at the end 38 portion near the portion 129.
[0070]
Further, as shown in FIG. 16, the interval between the outside air introduction shallow groove 33 and the intake port 123 is set by the annular skirts 35 and 37 when the piston 24 occupies the approach end. When the piston 24 enters the compression stroke, as shown in FIG. 17, the annular skirt 37 rides on the outside air introduction shallow groove 33, and the outside air is drawn into the intake port as shown by the arrow P in FIG. As shown in FIG. 18, near the end of the compression stroke, the size is selected so that the communication between the outside air introduction shallow groove 33 and the intake port 123 is blocked by the annular skirt 37 as shown in FIG. ing.
[0071]
When the annular skirt 35 gets into the short shallow groove 32 at the end of the compression stroke, the annular skirt 35 is in close contact with the portion 31A of the inner peripheral wall 31 between the adjacent short shallow grooves 32, but does not enter the short shallow groove 31. The liquid remaining in the liquid passage between the remaining portion 28A of the chamber 28 and the port 30 to the discharge port 118 shown in FIG. 33 is caused by the pressure from the short shallow groove 32 as shown by an arrow W in FIG. The gap 31B between the annular skirt 35 and the annular skirt 37 returns to the container through the intake port 123, and the residual pressure does not act on the discharge port 118, preventing dripping at the end of discharge. Is done.
[0072]
20 and 21 are the scope of the claims.5The second embodiment of the present invention is shown, and differs from the first embodiment shown in FIGS. 16 to 19 in the following structures, but other structures of the trigger type liquid ejector are shown. Has the same structure as the first embodiment.
[0073]
That is, in the first embodiment, the outer cylinder portion 25 of the cylinder 23 is formed with a single inner diameter, whereas in the second embodiment, the outer cylinder portion of the cylinder has a large outer diameter on the approach end side. A two-stage configuration of a cylindrical portion 39 and a small-diameter outer cylindrical portion 40 on the stroke end side is established, and an intake port 42 into the container is opened in a connection wall portion 41 between the large-diameter outer cylindrical portion 39 and the small-diameter outer cylindrical portion 40. Has been.
[0074]
In the first embodiment, the piston 24 has a single structure. In the second embodiment, the piston 24 is fitted into the air piston 43 and the air piston 43 that slide in the large-diameter outer cylinder portion 39. The air piston 43 and the liquid piston 44 are integrally coupled to each other at a fitting portion 45 at the top of each other.
[0075]
A groove 43 </ b> A is recessed in the inner peripheral surface of the air piston 43 in the fitting portion 45.
[0076]
In the illustrated example, the grooves 43 </ b> A are formed at four locations whose phases are different by an angle of 90 degrees on the inner peripheral surface of the air piston 43.
[0077]
A small hole 44 </ b> B is formed through the top 44 </ b> A of the liquid piston 44.
[0078]
The groove 43A and the small hole 44B communicate with each other. By this communication, the inner space 44C of the liquid piston 44, the inner space 27A of the inner cylindrical portion 27 of the cylinder, the outer peripheral surface 27B of the inner cylindrical portion 27, and the inner periphery of the liquid piston 44 The gap 27C between the surface 44D, the internal space 43B of the air piston 43, and the intake port 42 are communicated with each other.
[0079]
An outside air introduction shallow groove 46 is recessed in the inner peripheral surface of the large-diameter outer cylinder portion 39, and a short shallow groove 48 for removing residual pressure is provided in the outer peripheral surface 27B adjacent to the bottom wall 27D of the cylinder. .
[0080]
The distance between the annular skirt 49 of the air piston 43 and the annular skirt 50 of the liquid piston 44, the operation of the outside air introduction groove 46, the short shallow groove 48, and the annular skirts 49, 50 are the same as in the first embodiment. .
[0081]
Therefore, as shown in FIG. 21, when the liquid piston 44 reaches the stroke end, the residual pressure in the cylinder chamber 28 passes through the communicating spaces and gaps, as indicated by the arrow Q, and the intake port 42. Return to the container.
[0082]
FIG. 22 shows the scope of the claims.5FIG. 20 and FIG. 21 show a third embodiment of the present invention. In the second embodiment shown in FIGS. 20 and 21, the air piston 43 and the liquid piston 44 are integrally coupled at the fitting portion 45 at the top. However, in the third embodiment, a lateral concave groove 105 that receives the action of the pressing piece 103 of the trigger 102 is formed at the top of the liquid piston 51, and the mounting cylinder 53 of the air piston 52 is connected to the cylinder wall 54 of the liquid piston 51. Further, it is externally fitted and fixed by an undercut structure 55.
[0083]
Also in this embodiment, the cylinder is formed by the large-diameter outer cylinder portion 39, the small-diameter outer cylinder portion 40, and the intake port 42 opened in the connection wall portion 41 of both as in the second embodiment.
[0084]
An outside air introduction shallow groove 46 is formed on the inner peripheral surface of the large-diameter outer cylinder portion 39.
[0085]
The third embodiment is different from the second embodiment in that a short shallow groove 48A for residual pressure removal is provided on the inner peripheral surface 47 of the small diameter outer cylinder portion 40.
[0086]
In this embodiment, when the annular skirt 50A of the liquid piston 51 rides on the short shallow groove 48A, the residual pressure in the cylinder chamber 28 is generated between the inner peripheral surface 47 of the small diameter outer cylindrical portion 40 and the outer peripheral surface 51A of the liquid piston 51. As indicated by an arrow R from the gap, the air returns to the container through the intake port 42.
[0087]
FIG. 23 shows the scope of the claims.5In the fourth embodiment of the present invention, a liquid piston 57 in which a piston portion 56 is located on an inner side and an air piston 58 on the outer side formed integrally therewith are provided with annular skirts 59, 60, 61. The air piston 58 is in close contact with the inner wall surface 64 of the large diameter outer cylinder portion 63 of the cylinder 62, and the liquid piston 57 is in contact with the inner wall surface 66 of the small diameter inner cylinder portion 65 of the cylinder 62. It is made close to.
[0088]
In this embodiment, a shallow groove for introducing outside air is not formed on the inner wall surface 64 of the large-diameter outer cylinder portion 63, and the outside skirt 59 passes directly through the intake port 123 into the container. Is introduced into the container.
[0089]
Further, a short pipe portion 68 that hangs down is provided at a position closer to the cylinder bottom wall 67 than the intake port 123 of the large-diameter outer cylinder portion 63.
[0090]
The short pipe portion 68 is configured so that the residual pressure liquid discharged from the short shallow groove 69 for removing the residual pressure formed on the inner wall surface 66 of the small diameter inner cylinder portion 65 is separated from the inner and outer peripheral surfaces of the small diameter inner cylinder portion 65 and the liquid piston. This is for passing through a gap between the outer peripheral surface of 57 and the inner peripheral surface of the air piston 58 and flowing downward perpendicular to the container direction.
[0091]
For this reason, the dimensions of each part are set so that the annular skirt 59 can close the intake port 123 as indicated by the symbol V in FIG. 23 when the annular skirt 60 gets on the short shallow groove 69.
[0092]
24 and 25, the inner peripheral wall of the cylinder 72 of the pump portion 71 is divided into a large diameter portion 73 on the opening end side and a small diameter portion 75 on the bottom wall 74 side, and on the stroke end side of the piston 76, An annular skirt 77 elastically contacting the small diameter portion 75 of the cylinder 72 is formed, and an annular skirt 78 elastically contacting the large diameter portion 73 of the cylinder 72 is formed on the approach end side.
[0093]
A short shallow groove 79 is provided in a portion where the small diameter portion 75 of the cylinder 72 is in contact with the bottom wall 74, and the entire length of the small diameter portion 75 is as shown in FIG. When the end edge of 77 enters the short shallow groove 79, the length of the end edge of the other annular skirt 78 occupying the position of the boundary 80 between the large diameter portion 73 and the small diameter portion 75 is selected.
[0094]
A liquid channel 81 communicating with the inside of the container is opened in the small diameter portion 75 close to the boundary 80, and an intake port 82 is opened in the large diameter portion 73 close to the boundary 80.
[0095]
24 and 25, reference numeral 83 denotes a liquid suction and discharge port.
[0096]
As shown in FIG. 24, the inner peripheral wall of the large-diameter portion 73 of the cylinder 72 is slightly closer to the bottom wall 74 than the position occupied by the annular skirt 78 when the piston 76 occupies the approach end, as shown in FIG. A plurality of low ridges 84 that run in the direction of the bus are provided in the length range up to the position of.
[0097]
In this embodiment, when the piston 76 is advanced from the approach end position shown in FIG. 24 to the stroke end position shown in FIG. 25, the liquid in the cylinder chamber 85 causes the annular skirt 77 to have a small diameter portion. Compressed to advance along the inner peripheral wall 75, flows into the liquid flow path 86 from the port 83, and is discharged to the liquid flow path 87.
[0098]
When the peripheral edge of the annular skirt 77 enters the short shallow groove 79 at the stroke end, the residual pressure existing in the piston 76, the liquid flow path 86, etc., as indicated by the arrows, the gap between the short shallow groove 79 and the annular skirt 77 and the liquid flow. It escapes into the container through the path 81, and the cause of dripping is removed.
[0099]
At this time, the annular skirt 78 is located at the boundary 80, and the intake port 82 is opened, so that the air flows into the container and the negative pressure in the container is prevented.
[0100]
When the piston 76 starts to retreat due to the elasticity of the spring 88, the cylinder chamber 85 becomes negative pressure, the liquid opens the check valve 89, and is sucked into the chamber 85 from the port 83 through the liquid flow path 86.
[0101]
When the piston 76 is retracted, the annular skirt 78 rides on the low protrusion 84 and the intake port 82 communicates with the atmosphere, so that the inside of the container is not negatively charged. When the piston 76 occupies the approach end, Since the annular skirt 78 is in close contact with the inner peripheral wall of the large diameter portion 73, liquid leakage from the intake port 82 is prevented.
[0102]
Of course, the short shallow groove 79 can be replaced with a low protrusion running in the direction of the bus, and the low protrusion 84 can be replaced with a short shallow groove running in the direction of the bus.
[0103]
Further, the low protrusion 84 can be replaced with the outside air introduction shallow groove 33 shown in FIG. 16 or the diameter expansion boundary 503 shown in FIG.
[0104]
FIG. 26 and FIG. 27 are claims.4The cylinder 91 of the pump portion 90 has an inner cylindrical portion 92, and the piston 93 has annular skirts 94 and 95 that are elastically contacted with the inner peripheral wall of the cylinder 91, and the inner cylindrical portion 92. An annular skirt 96 that elastically contacts the outer peripheral wall, a hole 98 is formed in the bottom wall 97 of the inner cylindrical portion 92, and the hole bottom is formed in the bottom wall 97 and communicates with the inside of the container. The upper end of 99 is communicated.
[0105]
A short shallow groove 301 is provided around the outer peripheral surface of the connecting portion between the outer peripheral surface of the inner cylinder portion 92 and the bottom wall 100 of the cylinder 91, and the piston 93 occupies the stroke end position as shown in FIG. At this time, the annular skirt 96 is configured such that the end edge enters the short shallow groove 301 and a gap is formed between the end edge and the groove bottom of the short shallow groove 301.
[0106]
An intake port 302 is opened on the cylinder wall closer to the cylinder opening than the position of the annular skirt 95 when the piston 93 occupies the stroke end position, so that the atmosphere can be introduced into the container.
[0107]
In this embodiment, when the piston 93 reaches the stroke end position as shown in FIG. 27, the edge of the annular skirt 96 enters the short shallow groove 301, and a gap is formed between the edge and the groove bottom. Therefore, the residual pressure in the liquid flow path 303, the remaining portion 305 of the cylinder chamber 304, the port 306, etc. is indicated by an arrow through the gap and the gap between the inner peripheral surface 307 of the piston 93 and the outer peripheral surface 308 of the inner cylindrical portion 92. As shown, it flows from the internal space of the piston 93 to the internal space of the inner cylindrical portion 92, and further flows into the container through the hole 98 of the bottom wall 97 through the liquid flow path 99, thereby preventing dripping due to residual pressure.
[0108]
In this embodiment, the residual pressure around the pump portion 90 is removed by the short shallow groove 301 of the inner cylinder portion 92 of the cylinder 91, the bottom wall 97, the hole 98 of the 100, and the liquid flow path 99. The degree of freedom in designing the outside air introduction structure for preventing the negative pressure to be a structure other than the illustrated intake port 302 is increased.
[0109]
Of course, the short shallow groove 301 can be replaced with a low protrusion in the busbar direction.
[0110]
28 and 29 show the scope of the claims.10The cylinder 310 of the pump unit 309 has a receiving cylinder 314 of a return spring 313 of the piston 312 in a concentric position on the bottom wall 311 and an outer surface of the bottom wall 311, that is, a reverse side. A liquid flow path 319 communicating with the inside of the container is formed at a portion facing the liquid guide pipe 317 including the stop valve 315 and the liquid flow path 316, and the liquid flow path 319 is formed at the axis of the bottom wall 320 of the receiving cylinder 314. A hole 321 communicated with is formed.
[0111]
An annular groove 322 is formed in the outer circumferential wall facing the hole 321 in the liquid guide pipe 317. An annular elastic valve 323 is disposed in the annular groove 322, and the elastic valve 323 has an upper end edge. Are sandwiched between the liquid guide pipe 317, the outer surface of the bottom wall 311 and the holding cylinder 318, and the drooping cylinder portion 325 of the elastic valve 323 closes the hole 321 from the outer surface.
[0112]
The piston 312 has annular skirts 326 and 327 that elastically contact the inner peripheral surface of the cylinder 310, and a pin that extends from the inner surface of the piston head 328 located on the approach end side to the stroke end side through the internal space 329. When the piston 312 reaches the stroke end position, the tip 330 of the pin body 330 passes through the hole 321 and closes the hole 321 from the outer surface. As shown in FIG. 29, the elastic valve 323 is elastically deformed so that the hole 321 can be closed.
[0113]
By releasing the closure of the hole 321 by the tip portion 331 of the pin body 330, the residual pressure of the liquid flow path 316, the cylinder chamber 332, the port 333, etc. is transferred into the container at the end of the liquid discharge when the piston 312 has occupied the stroke end position. It escapes and prevents dripping due to residual pressure.
[0114]
This claim10In the case of the present invention, since the residual pressure is removed by positively elastically deforming the elastic valve 323 with the tip 331 of the pin body 330, leakage of applied pressure due to accumulation of manufacturing errors of each member, residual pressure removal Insufficiency and the like are completely avoided, and dimensional management during production becomes easy.
[0115]
FIG. 30 shows the scope of the claims.71 shows an enlarged longitudinal section of a nozzle head portion 401 according to an embodiment of the present invention, and the nozzle head portion 401 is composed of a nozzle head 402, a liquid guide 403, a spin element 404, and a nozzle tip 406 having a discharge port 405. Has been.
[0116]
The liquid guide 403 has a valve body 410 that is in close contact with the valve seat 408 and closes the liquid flow path 407, and a pressure receiving cylinder portion 411 that is integral with the valve body 410, like the liquid guides of the first and second embodiments. The pressure receiving cylinder portion 411 has a pressure receiving surface portion 414 that receives the liquid pressure toward the upstream side of the liquid flow path 407.
[0117]
The liquid guide 403 is slidably inserted into the guide cylinder 418 of the spin element 404 by the guide cylinder 417, and a coil spring 413 is provided between the spring seat 412 protruding from the guide cylinder 418 and the back surface of the valve body 410. The valve body 410 is always in pressure contact with the valve seat 408.
[0118]
In FIG. 30, reference numeral 419 denotes a spring-supporting ridge in the direction of the generatrix provided in the guide tube 417 of the liquid guide 403.
[0119]
The liquid pressure-fed to the liquid flow path 115 by the operation of the trigger flows into the guide cylinder 417 of the liquid guide 403 from the liquid flow path 409, and receives the pressure of the pressure receiving cylinder part 411 from between the support ridges 419 through the window part 420. A hydraulic pressure is applied to the surface 414.
[0120]
As statedThe fruitAs in the case of the embodiment, at the moment when the pressing force due to the hydraulic pressure acting on the pressure receiving surface 414 becomes larger than the sum of the elastic pressure of the spring 413 and the hydraulic pressure acting on the back surface of the valve body 410. The body 410 is opened. In this embodiment, since the coil spring 413 is a separate body, the liquid guide 403 can be formed extremely easily.
[0121]
FIG. 31 shows the scope of the claims.2FIG. 16 shows an embodiment of the present invention. In the first embodiment shown in FIG. 16, a plurality of outside air introduction shallow grooves 33 running in the direction of the bus are recessed on the inner peripheral surface of the outer cylinder portion 25 of the cylinder 23. However, in the embodiment shown in FIG. 31, the cylinder is larger than the inner peripheral surface 501 of the inner peripheral surface of the outer cylinder portion 25 in the range of the hydraulic discharge stroke range of the annular skirts 35, 36, 37 of the piston 24. 23, the inner peripheral surface 502 near the opening 129 is slightly expanded, the expanded boundary 503 has a wave shape as indicated by the dotted line in FIG. 31, and the annular skirt 37 has a corrugated expanded boundary 503. The outside air is introduced into the intake port 123 from the opening 129 from the time of getting on.
[0122]
In this embodiment, the structure of the liquid feeding cylinder 505 having the check valve 504 and the structure of the diameter expansion boundary 503 are different from those of the embodiment shown in FIG. It is the same structure.
[0123]
Claims above2According to the present invention, it is easy to remove the mold at the time of molding the cylinder 23 portion.
[0124]
Claims described above5Among the embodiments of the present invention, the second embodiment and the third embodiment are that the piston is divided into an air piston and a liquid piston, and the third embodiment is such that the annular skirt of the piston is in the same direction. When facing the piston molding with synthetic resinDemoldingHowever, it becomes easier than the first embodiment, and the productivity is improved.
[0125]
FIG. 32 shows the scope of the claims.1FIG. 1 is an enlarged cross-sectional view showing only a main part of an embodiment of the present invention, and is shown in FIGS. 1 to 8 in a nozzle head portion 70 of a single trigger type liquid ejector.RunoApplying the slur head 2, the liquid guide 3, the spin element 4, and the nozzle tip 6, the pump mechanism 71 is shown in FIGS. 20 and 21.RuLinda members 39, 40, 41, and 42 and piston members 43, 44, 46, 48, 49, and 50 are applied to completely prevent dripping from the discharge port 5 or incomplete discharge of foam particles. Is done.
[Brief description of the drawings]
FIG. 1 showsUsed in the present inventionLiquid discharge mechanismVomitIt is an expanded longitudinal cross-sectional view which shows the state before a start of extraction.
FIG. 2 is an enlarged longitudinal sectional view of the nozzle head of what is shown in FIG.
FIG. 3 is a front view of what is shown in FIG. 2;
4 is an enlarged side view of an integral structure including a valve body, a pressure-receiving cylinder portion, a fixing portion, and a spring member shown in FIG. 1. FIG.
FIG. 5 is a front view of what is shown in FIG. 4;
FIG. 6 is a rear view of what is shown in FIG. 4;
FIG. 7 is a side view showing the half part as a cross-section with the phase shown in FIG. 4 different in phase by an angle of 90 degrees.
FIG. 8 is an enlarged longitudinal sectional view showing a state during ejection of what is shown in FIG. 1;
FIG. 9 showsUsed in the present inventionSecond of liquid discharge mechanismExample of vomitingIt is an expanded longitudinal cross-sectional view which shows the state before an extraction start.
FIG. 10 is an enlarged side view of the outer body of the liquid guide shown in FIG. 9;
FIG. 11 is a rear view of what is shown in FIG. 10;
FIG. 12 is a side view showing the half portion as a cross-section, with the phase shown in FIG. 10 being different in phase by an angle of 90 degrees.
13 is an enlarged side view showing a half portion of the inner body of the liquid guide shown in FIG. 9 as a cross section. FIG.
FIG. 14 is a front view of what is shown in FIG. 13;
FIG. 15 is an enlarged longitudinal sectional view showing a state during ejection of what is shown in FIG. 9;
FIG. 16 showsThe present inventionIt is an expanded longitudinal cross-sectional view in the stationary state of 1st Example of the pump mechanism which concerns on this.
FIG. 17 is an enlarged longitudinal sectional view showing an intake stroke in the middle of operation of what is shown in FIG. 16;
FIG. 18 is an enlarged longitudinal sectional view showing a state in which the liquid discharge process has progressed from the state shown in FIG. 17;
FIG. 19 is an enlarged longitudinal sectional view showing a state in which the liquid discharge process is completed and the process proceeds to a residual pressure removal process.
FIG. 20 showsThe present inventionIt is an expanded longitudinal cross-sectional view which shows the intake stroke of the 2nd Example of the pump mechanism to which this is applied.
FIG. 21 is an enlarged longitudinal sectional view showing a residual pressure removing process of what is shown in FIG. 20;
FIG. 22 is an enlarged longitudinal sectional view showing a discharge stroke of a third embodiment of the pump mechanism.
FIG. 23 is an enlarged longitudinal sectional view showing a discharge stroke of a fourth embodiment of the pump mechanism.
FIG. 24 is an enlarged longitudinal sectional view when the piston of the pump mechanism occupies the approach end.
FIG. 25 shows,FIG. 25 is an enlarged longitudinal sectional view showing a residual pressure removing process shown in FIG. 24.
FIG. 26 shows, The present inventionIt is an enlarged longitudinal cross-sectional view when the piston of the embodiment of the embodiment occupies the approach end.
FIG. 27 shows,FIG. 27 is an enlarged longitudinal sectional view showing a residual pressure removing process shown in FIG. 26.
FIG. 28 shows, The present inventionIt is an expanded longitudinal cross-sectional view when the piston of an example of implementation of occupies the approach end.
Fig. 29 shows,FIG. 29 is an enlarged longitudinal sectional view showing a residual pressure removing process shown in FIG. 28.
FIG. 30 shows, The present inventionIt is an expanded longitudinal cross-sectional view of the Example of.
FIG. 31 shows, The present inventionIt is an expansion longitudinal cross-sectional view of another Example of this.
FIG. 32 showsThe present inventionIt is an expanded sectional view of the important section of an example of implementation.
FIG. 33 is an enlarged cross-sectional view of an example of a conventional trigger type liquid ejector.
FIG. 34 showsFig. 33It is a diagram which shows the change of the discharge pressure in the trigger type | formula liquid discharger shown in.
[Explanation of symbols]
3, 203, 403: Liquid guide,
5, 205, 405: discharge port,
7, 207, 407: upstream liquid flow path,
10, 210, 410: valve body,
11, 211, 411: pressure receiving cylinder part,
13, 213, 413: spring members,
14, 214, 414: pressure receiving surface portion,
420: fenestration part,
23: cylinder,
24: piston,
25: outer cylinder,
27: Inner cylinder part,
29: bottom wall,
31: Inner wall,
32: short shallow groove,
33: Outside air introduction shallow groove,
35, 36, 37: annular skirt,
91: cylinder,
92: inner cylinder part,
93: piston,
94, 95, 96: annular skirt,
97: bottom wall,
98: hole,
99: liquid flow path,
100: bottom wall,
301: Short shallow groove,
303: Liquid channel
310: cylinder,
311: bottom wall,
312: piston,
319: liquid flow path,
321: hole,
323: elastic valve,
417: guide tube,
418: guide tube,

Claims (12)

A pump part is formed by the cylinder, the piston, and a trigger (102) for moving the piston back and forth. The liquid sucked into the cylinder from the container moves to the stroke end of the piston, and the discharge cylinder (F) In the trigger type liquid discharger discharged from the discharge port,
A valve body (10) that always closes the liquid flow path (7) in the liquid flow path (7) on the upstream side of the discharge port (5) in the discharge cylinder, and a pressure-receiving cylinder portion that is molded integrally with the valve body ( 11), a fixing part (12) to the discharge cylinder, and a spring member (13) that connects the integrated valve body (10) and pressure receiving cylinder part (11) to the fixing part (12). A guide (3) is arranged,
The pressure receiving cylinder portion (11) has a pressure receiving surface portion (14) that receives the liquid pressure toward the upstream side of the liquid flow path (7),
The pressure of the normal discharge fluid pressure received by the pressure receiving surface portion (14) is larger than the sum of the fluid pressure toward the downstream side of the fluid flow path received by the valve body (10) and the elastic pressure of the spring member (13). An area of the pressure-receiving surface portion (14) is selected ,
A plurality of short and shallow grooves (32) running in the direction of the bus are formed in the inner peripheral wall (31) portion of the cylinder in contact with the bottom wall (29) of the cylinder (23),
In addition, an intake port (123) communicating with the inside of the container is opened on the peripheral wall of the cylinder.
The piston (24) is formed with two annular skirts (35, 37) that are in close contact with the inner peripheral wall of the cylinder,
The interval between the two annular skirts is such that one annular skirt (35) rides on the short shallow groove (32) of the cylinder and the other annular skirt (37) is closer to the intake port (123). A trigger type liquid discharger selected at an interval close to the cylinder inner wall near the open end of the cylinder . On the cylinder inner surface between a position where the annular skirt (35) rides on the short shallow groove (32) and a position closer to the intake port than a position occupied by the annular skirt (37) when the piston occupies the approach end, The trigger type liquid ejector according to claim 1 , wherein an outside air introduction recess is formed. A pump part is formed by the cylinder, the piston, and a trigger (102) for moving the piston back and forth. The liquid sucked into the cylinder from the container moves to the stroke end of the piston, and the discharge cylinder (F) In the trigger type liquid discharger discharged from the discharge port,
A valve body (10) that always closes the liquid flow path (7) in the liquid flow path (7) on the upstream side of the discharge port (5) in the discharge cylinder, and a pressure-receiving cylinder portion that is molded integrally with the valve body ( 11), a fixing part (12) to the discharge cylinder, and a spring member (13) that connects the integrated valve body (10) and pressure receiving cylinder part (11) to the fixing part (12). A guide (3) is arranged,
The pressure receiving cylinder portion (11) has a pressure receiving surface portion (14) that receives the liquid pressure toward the upstream side of the liquid flow path (7),
The pressure of the normal discharge fluid pressure received by the pressure receiving surface portion (14) is larger than the sum of the fluid pressure toward the downstream side of the fluid flow path received by the valve body (10) and the elastic pressure of the spring member (13). An area of the pressure-receiving surface portion (14) is selected,
The cylinder of the pump part has a double structure of an outer cylinder part and a concentric inner cylinder part,
A short shallow groove is provided around the outer peripheral surface of the inner cylindrical portion connected to the bottom wall of the outer cylindrical portion,
When the skirt portion in contact with the inner cylindrical portion outer peripheral surface of the piston has entered the short shallow groove through the gap between the skirt portion and short shallow groove, the liquid flow path is communicated with the vessel, the trigger type liquid discharge vessel. A pump part (90) is formed by a cylinder (91), a piston (93), and a trigger (102) for moving the piston back and forth, and the liquid sucked into the cylinder (91) from the container is a stroke of the piston. In the trigger type liquid discharger discharged from the discharge port of the discharge cylinder (F) by moving to the end,
A valve body (10) that always closes the liquid flow path (7) in the liquid flow path (7) on the upstream side of the discharge port (5) in the discharge cylinder, and a pressure-receiving cylinder portion that is molded integrally with the valve body ( 11), a fixing part (12) to the discharge cylinder, and a spring member (13) that connects the integrated valve body (10) and pressure receiving cylinder part (11) to the fixing part (12). A guide (3) is arranged,
The pressure receiving cylinder portion (11) has a pressure receiving surface portion (14) that receives the liquid pressure toward the upstream side of the liquid flow path (7),
The pressure of the normal discharge fluid pressure received by the pressure receiving surface portion (14) is larger than the sum of the fluid pressure toward the downstream side of the fluid flow path received by the valve body (10) and the elastic pressure of the spring member (13). An area of the pressure-receiving surface portion (14) is selected,
A hole (98) is drilled at the axial center position of the bottom wall (97) of the inner cylinder (92) of the cylinder (91),
The hole (98) is formed in the bottom wall (97) and communicates with the upper end of the liquid channel (99) communicating with the inside of the container.
A short shallow groove (301) is provided around a connection portion between the outer peripheral surface of the inner cylinder portion (92) and the bottom wall (100) of the cylinder (91),
When the skirt portion (96) of the piston (93) enters the short shallow groove (301) at the stroke end, the gap between the inner peripheral surface of the piston (93) and the outer peripheral surface of the inner cylindrical portion (92) is determined. between the discharge tube and the cylinder chamber, the liquid flow path (303) side is communicated with the vessel, the trigger type liquid dispenser. A pump is formed by the cylinder, the piston, and a trigger (102) for moving the piston back and forth, and the liquid sucked into the cylinder from the container moves to the stroke end of the piston, thereby discharging the discharge cylinder (F). In the trigger type liquid discharger discharged from the outlet,
A plurality of short and shallow grooves (32) running in the direction of the bus are formed in the inner peripheral wall (31) portion of the cylinder in contact with the bottom wall (29) of the cylinder (23),
In addition, an intake port (123) communicating with the inside of the container is opened on the peripheral wall of the cylinder.
The piston (24) is formed with two annular skirts (35, 37) that are in close contact with the inner peripheral wall of the cylinder,
The interval between the two annular skirts is such that one annular skirt (35) rides on the short shallow groove (32) of the cylinder and the other annular skirt (37) is closer to the intake port (123). A trigger type liquid discharger selected at an interval close to the cylinder inner wall near the open end of the cylinder. A valve body (410) that always closes the liquid flow path (407) in the liquid flow path (407) upstream of the discharge port (405) in the discharge cylinder, and a pressure receiving cylinder molded integrally with the valve body A liquid guide (403) having a portion (411) and a guide cylinder (417) for connecting the valve body (410) and the pressure receiving cylinder part (411) with the open window part (420) interposed therebetween;
The liquid guide (403) is slidably fitted into the guide cylinder (418) of the spin element (404) by the guide cylinder (417),
The spring (413) interposed between the guide tube (417) and the guide tube (418) urges the valve body (410) to always close the liquid flow path (407),
The pressure-receiving cylinder part (411) has a pressure-receiving surface part (414) that receives the liquid pressure toward the upstream side of the liquid flow path (407),
The pressure of the normal discharge hydraulic pressure received by the pressure receiving surface portion (414) is greater than the sum of the hydraulic pressure received by the valve body (410) toward the downstream side of the liquid flow path and the elastic pressure of the spring (413). The trigger type liquid ejector according to claim 5 , wherein an area of the pressure receiving surface portion (414) is selected. A pump is formed by the cylinder, the piston, and a trigger (102) for moving the piston back and forth, and the liquid sucked into the cylinder from the container moves to the stroke end of the piston, thereby discharging the discharge cylinder (F). In the trigger type liquid discharger discharged from the outlet,
A valve body (410) that always closes the liquid flow path (407) in the liquid flow path (407) upstream from the discharge port (405) in the discharge cylinder, and a pressure receiving cylinder portion (molded integrally with the valve body) 411), and a liquid guide (403) having a valve body (410) and a guide cylinder (417) for connecting the pressure receiving cylinder part (411) with the open window part (420) disposed,
The liquid guide (403) is slidably fitted into the guide cylinder (418) of the spin element (404) by the guide cylinder (417),
The spring (413) interposed between the guide tube (417) and the guide tube (418) urges the valve body (410) to always close the liquid flow path (407),
The pressure-receiving cylinder part (411) has a pressure-receiving surface part (414) that receives the liquid pressure toward the upstream side of the liquid flow path (407),
The pressure of the normal discharge hydraulic pressure received by the pressure receiving surface portion (414) is larger than the sum of the hydraulic pressure received by the valve body (410) and the elastic pressure of the spring (413). A trigger type liquid ejector in which an area of the pressure receiving surface portion (414) is selected. The cylinder of the pump part has a double structure of an outer cylinder part and a concentric inner cylinder part,
A short shallow groove is provided around the outer peripheral surface of the inner cylindrical portion connected to the bottom wall of the outer cylindrical portion,
When the skirt portion in contact with the inner cylindrical portion outer peripheral surface of the piston has entered the short shallow groove through the gap between the skirt portion and short shallow groove, the liquid flow path is communicated with the vessel, the scope of the claims 7, wherein Trigger type liquid ejector. A hole (98) is drilled at the axial center position of the bottom wall (97) of the inner cylinder (92) of the cylinder (91),
The hole (98) is formed in the bottom wall (97) and communicates with the upper end of the liquid channel (99) communicating with the inside of the container.
A short shallow groove (301) is provided around a connection portion between the outer peripheral surface of the inner cylinder portion (92) and the bottom wall (100) of the cylinder (91),
When the skirt portion (96) of the piston (93) enters the short shallow groove (301) at the stroke end, the gap between the inner peripheral surface of the piston (93) and the outer peripheral surface of the inner cylindrical portion (92) is determined. The trigger type liquid discharger according to claim 7 , wherein the liquid flow path (303) side between the discharge cylinder and the cylinder chamber is communicated with the inside of the container. A pump is formed by a cylinder, a piston, and a trigger for moving the piston back and forth, and the liquid sucked into the cylinder from the container is discharged from the discharge port of the discharge cylinder (F) by the movement to the stroke end of the piston. In the triggered liquid dispenser,
A hole (321) is formed in the axial center position of the bottom wall (311) of the cylinder (310),
The hole (321) communicates with the liquid flow path (319) communicating from the outer surface of the bottom wall (311) into the container,
The hole (321) is closed by an elastic valve (323) elastically contacted to the outer surface of the bottom wall (311),
A pin body (330) extends toward the bottom wall (311) of the cylinder (310) at the axial center position of the piston (312),
When the piston (312) reaches the stroke end, the tip end portion (331) of the pin body (330) elastically deforms the elastic valve (323) through the hole (321), and causes the cylinder chamber (332) to move. A trigger type liquid ejector communicating with the liquid flow path (319). A valve body (10) that always closes the liquid flow path (7) in the liquid flow path (7) on the upstream side of the discharge port (5) in the discharge cylinder, and a pressure-receiving cylinder portion that is molded integrally with the valve body ( 11), a fixing part (12) to the discharge cylinder, and a spring member (13) that connects the integrated valve body (10) and pressure receiving cylinder part (11) to the fixing part (12). A guide (3) is arranged,
The pressure receiving cylinder portion (11) has a pressure receiving surface portion (14) that receives the liquid pressure toward the upstream side of the liquid flow path (7),
The pressure of the normal discharge fluid pressure received by the pressure receiving surface portion (14) is larger than the sum of the fluid pressure received by the valve body (10) toward the downstream side of the fluid flow path and the elastic pressure of the spring member (13). The trigger type liquid ejector according to claim 10 , wherein an area of the pressure receiving surface portion (14) is selected. A valve body (410) that always closes the liquid flow path (407) in the liquid flow path (407) on the upstream side of the discharge port (405) in the discharge cylinder, and a pressure receiving cylinder portion formed integrally with the valve body (411) and a liquid guide (403) having a valve cylinder (410) and a pressure receiving cylinder part (411) with a guide cylinder (417) connecting the open window part (420) are disposed,
The liquid guide (403) is slidably fitted into the guide cylinder (418) of the spin element (404) by the guide cylinder (417),
The spring (413) interposed between the guide tube (417) and the guide tube (418) urges the valve body (410) to always close the liquid flow path (407),
The pressure-receiving cylinder part (411) has a pressure-receiving surface part (414) that receives the liquid pressure toward the upstream side of the liquid flow path (407),
The pressure of the normal discharge hydraulic pressure received by the pressure receiving surface portion (414) is greater than the sum of the hydraulic pressure received by the valve body (410) toward the downstream side of the liquid flow path and the elastic pressure of the spring (413). The trigger type liquid ejector according to claim 10 , wherein an area of the pressure receiving surface portion (414) is selected.

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