JP3457709B2 - Filling valve for liquid filling machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a container with a liquid, for example, a container made of glass, plastic, or the like, with various liquids such as drinking water, oil, cosmetic liquid, and chemical solution. The present invention relates to a filling valve of a liquid filling machine used for automatic filling of a certain amount to near the mouth. 2. Description of the Related Art Conventionally, there has been a problem in automatically filling a container with a fixed amount of liquid by using a filling valve of a liquid filling machine.
Although the liquid supply to the container is automatically stopped when the communication between the air release pipe and the air in the container is interrupted by the liquid supplied to the container, the liquid supplied to the container at the time of the communication interruption is reduced. Since the stop is performed with the air release pipe slightly raised, when the filled container is removed from the filling valve of the liquid filling machine, the slightly raised liquid remains in the air release pipe. Therefore, after removing the filled container from the filling valve, the next container is pressed against the lower end of the filling valve to fill the container with the liquid from the liquid tank. Withdrawing is not performed smoothly, filling time is slightly longer,
As a result, there is a disadvantage that the filling capacity of the liquid filling machine is reduced. As a countermeasure against this, Japanese Patent Publication No. 58-52915
An apparatus has been developed which forcibly removes the liquid remaining in the air vent tube at the start of filling the container with liquid, as shown in FIG. That is, in the filling device shown in the sectional front view of FIG. 9 and the sectional view of FIG. The inside of the outer cylinder 101
The upper half has a large-diameter portion 102 and the lower half has a small-diameter portion 103. A wall 104 of the large-diameter portion 102 has a window 104 through which liquid in the tank 100 can enter. 105 is the small diameter portion 10
3 is an inner cylinder fitted up and down so as to be able to move up and down, the upper end of which can be brought into contact with the upper surface of a stepped portion 106 formed by the small diameter portion 103 and the large diameter portion 102.
7, the lower part of which is in contact with the inner surface of the small diameter portion 103,
And there is a liquid entry window 108. A coil spring 110 is provided between the upper surface of the valve body 107 and the cap 109 at the upper end of the outer cylinder 101.
It is in conflict with 6. Reference numeral 111 denotes a piston cylinder, the upper part of which is in contact with the inner surface of the outer cylinder 101, and the upper end thereof is provided with a gap with the end of the inner cylinder 105. I'm left. The lower end of the piston cylinder 111 is located below the end of the outer cylinder 101, and the lower surface of the horizontal flange portion 112 can abut the mouth of the container. The upper surface of the flange 112 and the outer cylinder 101
There is a coil spring 114 for pressing the flange portion 112 downward between the ridges 113 provided at appropriate positions. Further, a liquid introduction pipe 115 suspended therefrom is provided at the center of the lower surface of the flange portion 112, below which a small amount of liquid can enter into the container, and the end is opened. An air vent pipe 116 penetrates the cap 109 and is fixed thereto. The upper end of the air vent pipe is above the liquid surface of the liquid in the tank 100 and is released into the tank 100, and the lower part thereof is the outer cylinder 101 and the valve body. On-off valve 11 that penetrates the respective central axes of 107, piston cylinder 111, and liquid introduction pipe 115, and whose upper surface shields the end of liquid introduction pipe 115 at the end.
7 is provided. As shown in FIG. 10, an auxiliary introduction pipe 119 having a clearance outside the pipe 116 and having a closed end is provided below the air release pipe 116 in contact with the inner surface of the liquid introduction pipe 115. A vertically long liquid outflow hole 120 is formed on one side thereof. Further, below the air vent pipe 116, an air vent hole 118 is provided at a position facing the liquid outflow hole 120, and the hole 118 is provided with the air vent pipe 116 and the auxiliary introduction pipe 119.
Through the auxiliary introduction pipe 119. At this time, the air vent hole 118 does not communicate with the gap between the air vent tube 116 and the auxiliary introduction tube 119. [0005] In FIG. 9, the liquid in the tank 100 is located in the large-diameter portion 102 from the entrance window 104 of the outer cylinder 101, but the valve body 107 prevents the liquid from entering the small-diameter portion 103. When the container into which the liquid is to be injected rises with an appropriate device (not shown), its mouth hits the flange 112 and is pushed up against the pressing force of the spring 114.
The piston cylinder 111 and the liquid introduction pipe 115 rise. At this point, even if the pipe 115 is raised, the holes 118, 1 of the air vent pipe 116 and the auxiliary introduction pipe 119 are formed.
Since the valve 20 is closed, the pressure in the small diameter portion 103 is compressed and rises. When the piston cylinder 111 further rises, the upper end of the cylinder 111 abuts against the end of the inner cylinder 105 to raise the inner cylinder 105 against the pressing force of the spring 110, so that the valve element 107 is interlocked. As a result, the small diameter portion 1
Since the pressure of the liquid 03 is high, the liquid enters the small-diameter portion 103 through the window 108 of the inner cylinder 105 vigorously. At this time, since the liquid outflow hole 120 is already opened in the container opening, the liquid flows out of the piston cylinder 111. After passing through the introduction pipe 119, the water rapidly flows into the container from the outflow hole 120. Also, since the air in the container has a vigorous outflow of fluid into the container, it also quickly enters the air vent tube 116 from the air vent hole 118, and even if a small amount of liquid or the like accumulates in the tube 116. It is raised by the force of air discharge, and exhaust gas or liquid is reduced above the tank 100. When the amount of liquid in the container reaches a certain amount, the container is lowered by an appropriate device, and each member returns to the old position by performing the opposite operation to that described above, and this operation is sequentially repeated. However, such a device eliminates the drawback that the liquid enters the air vent pipe 116, hinders the discharge of air from the container, prevents the liquid from being injected, and increases the filling time. However, there are the following problems. (1) Since the upper valve body 107 forming the cylinder chamber forms a check valve closed by the force of the spring 110,
In the case of mounting on a high-speed filling machine or the like, since the rising speed of the piston cylinder 111 is fast, the hydraulic pressure in the cylinder chamber formed by the small-diameter portion 103 becomes rapid and excessive, and the valve body 107 is lifted to increase the liquid in the cylinder chamber. It may flow back to the tank 100 side, and the pressurizing effect in the cylinder chamber may decrease with the filling efficiency. (2) The operation of compressing the liquid in the cylinder chamber, which is performed before the liquid from the tank 100 is injected into the container, generates a large or small impact. It is not preferable from the viewpoint of becoming. (3) Since a sealing member cannot be attached to the contact surface between the on-off valve 117 below the air vent pipe 116 and the liquid introduction pipe 115 due to the structure, the contact portion is small, and the seal is incomplete. During the non-filling step, the liquid in the cylinder chamber may leak to the outside. Another prior art is disclosed in Japanese Patent Publication No. Sho 58-2.
Although there is a device as shown in No. 2421 for removing compressed liquid by flowing compressed air through an air vent tube, it has the following problems. (1) Since a spiral spring is provided in the compression chamber formed by the outer shell for guiding the container mouth part receiver and the container mouth part receiver with packing for abutting the container mouth part, dirt is easily attached to the spring, which is not hygienic. (2) The outer dimensions of the container to be handled must be smaller than the inner dimensions of the outer casing for guiding the receptacle opening of the container, which limits the dimensions of the container to be handled. (3) Filling liquid adhering to the lower end edge of the filling beak pipe may adhere to the upper surface of the container mouth receptacle with packing for abutment of the container mouth, and may contaminate the compression chamber. Occasionally, it may enter the container. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been proposed to reduce the liquid filling efficiency of a container without reducing the liquid filling efficiency and without compressing the liquid. It is an object of the present invention to provide a filling valve of a liquid filling machine that can easily and smoothly forcibly remove liquid remaining in an air vent pipe at the start, is sanitary, and can easily cope with a container having a large body diameter. Aim. In order to achieve the above object, the present invention provides a main body suspended from a liquid tank, and a liquid passage and an air vent passage which are inserted through the main body so as to be slidable up and down. A liquid filling valve body with a liquid introduction pipe protruding therethrough, and an air vent pipe protruding concentrically outside the liquid introduction pipe at the lower part, and the upper part is inserted through the inner surface of the lower part of the main body in a vertically slidable manner and always downward. A valve seat body which is urged to the outside and which partially forms an air vent passage formed with the outer surface of the liquid introduction pipe at the center and constitutes a valve together with the air vent valve body, and is slidably moved up and down on the outer surface of the valve seat body. A cylinder which is fitted and constantly urged downward, forms an air pump chamber with the lower part of the valve seat, and has a compressed air ejection hole formed with an air vent pipe at the lower end of the valve seat. , Press the mouth of the container against the bottom of the cylinder When the cylinder is pushed up together with the container, the volume of the air pump chamber is reduced to positively supply air into the container from the mouth of the container. In the filling valve of the liquid filling machine of the present invention, in order to fill the container with the liquid in the liquid tank, the mouth of the container is pressed against the lower end of the filling valve and the lower end of the filling valve is pushed up together with the container. Before the liquid is supplied to the container, air from the air pump chamber, actually compressed air of a relatively high pressure corresponding to the lifting force, is supplied to the container, and the air in the container passes through the air vent pipe to the liquid tank. The liquid remaining in the air vent pipe is forcibly returned to the liquid tank together with the air by the strong air discharge. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the filling valve of the liquid filling machine according to the present invention will be described with reference to the drawings. FIG. 1 is a cutaway front view of the filling valve, FIG. 2 is a sectional view taken along the line II-II of FIG. 3 to 8 are operation change diagrams of the filling valve. In FIG. 1 and FIG. 2, a liquid passage 5 and an air vent passage 6 are formed at an upper portion of a main body 4 of a filling valve 3 attached to a liquid tank 2 of a liquid filling machine 1 so as not to interfere with each other. A liquid filling valve body 8 having a liquid introducing pipe 7 protruding downward is attached so as to be able to slide up and down in response to opening and closing of the valve. In the lower part of the main body 4, an air vent pipe 9 is formed so as to protrude downward concentrically with the liquid inlet pipe 7, and an air vent passage 6 formed with the outer surface of the liquid inlet pipe 7 of the liquid filling valve 8.
A valve seat body 12 having a valve seat 11 of an air vent valve body 10 integrally formed with the liquid introduction pipe 7 at a central portion where the width is widened.
Are slidably mounted up and down. Normally, the valve seat body 12 holds the valve seat 11 in a closed state by the urging force of a spring 13 provided outside the main body 4, and the valve seat body 12 moves upward to move the liquid filling valve body 8 It is installed to push up. Further, the valve seat body 12 forms an air pump pipe 14 between the lower portion of the valve seat body 12 and the cylinder 16. The cylinder 16 is provided with a compressed air ejection hole 15 concentric with the liquid introduction pipe 7 and the air release pipe 9 in a state penetrated therethrough. Therefore, the mouth of the container 17 is positioned at the lower end of the filling valve 3,
That is, in a state in which the cylinder 16 is pressed against the lower end of the cylinder 16 against the urging force of the spring 18 provided concentrically outside the main body 4 together with the container 17,
The volume of the air pump chamber 14 is reduced and the compressed air
The air is positively supplied into the container 17 from the above. Reference numeral 19 denotes an air suction hole with a reed valve 20 that sucks air into the air pump chamber 14 when the volume of the air pump chamber 14 increases. Next, the operation of such an apparatus will be described with reference to the operation change diagrams shown in FIGS. In the filling valve 3 of the liquid filling machine 1, in order to fill the container 17 with the liquid in the liquid tank 2, the mouth of the container 17 is applied to the lower end of the filling valve 3 and the cylinder 16 at the lower end of the filling valve 3 is still pushed up. 3, the valve seat 11 is closed by the biasing force of the spring 13, and the liquid filling valve body 8 is also in the valve closed state located at the slide lower end. When the cylinder 16 at the lower end of the filling valve 3 is pushed up together with the container 17 against the urging force of the spring 18 from this free state, the volume of the air pump chamber 14 is first reduced as in the compressed air state shown in FIG. Before the liquid is supplied to the container 17, high-pressure compressed air corresponding to the high speed of the piston for pushing up the container 17 is supplied from the air pump chamber 14 to the container 17 through the compressed air ejection hole 15. When the cylinder 16 is further pushed up against the urging force of the spring 18, FIG.
When the valve seat body 12 rises against the urging force of the spring 13 and the valve seat 11 opens, as in a vent line scavenging state shown in FIG. The liquid discharged from the liquid tank 2 through the air vent passage 6 together with the air is discharged together with the air by the strong air discharge.
It is forcibly returned at once. Next, when the valve seat body 12 together with the cylinder 16 is further pushed up against the urging forces of the respective springs 18 and 13 through the vent line scavenging state with the valve seat 11 opened, the liquid filling state shown in FIG. As shown in FIG.
Is raised and opened by being pushed up by the valve seat body 12,
Since the residual liquid has been scavenged from the air vent passage 6, the liquid from the liquid tank 2 passes through the liquid introduction pipe 7 while the air in the container 17 is smoothly discharged to the space in the liquid tank 2. It is efficiently supplied to the container 17 in a short time. Thereafter, the filling is continued, and the liquid is introduced into the liquid introduction pipe 7 and the air release pipe 9.
The liquid supply to the container 17 is automatically stopped in a state where the communication with the container 17 is interrupted. In this stopped state, the liquid slightly rises and remains in the air vent pipe 9. When the container 17 is lowered from the liquid-filled state as the piston descends, the cylinder 16 and the valve seat body 12 are lowered by the urging force of the springs 18 and 13, and the valve seat 11 is first closed as shown in FIG. When the container 17 is further lowered in accordance with the lowering of the piston in the closed state of the air vent valve, the liquid filling valve body 8 is lowered and closed to return to the closed state of FIG. 8 which is the same as the free state shown in FIG. The same operation as described above is repeated. Thus, according to such an apparatus, the container 1
When the liquid 7 in the liquid tank 2 is filled into the container 17 through the liquid introduction pipe 7 by completely pushing up the lower end of the filling valve 3 to open the liquid filling valve element 8 completely, the air vent pipe 9
There is no residual liquid in the liquid tank 2 and the liquid in the liquid tank 2 is
Can be smoothly supplied into the container 17 through the
In addition, since the operation of discharging the liquid remaining in the air vent pipe 9 does not compress the liquid but uses the action of compressing air, the liquid filling machine 1 including the filling valve 3 suddenly overloads during this discharging operation. This has the effect of not only maintaining the liquid filling efficiency in the container 17, but also increasing the efficiency, without the need to apply. In addition, since the spring 18 is provided outside the valve and the filling edge of the lower end opening of the filling beak tube is eliminated, contamination of the compression chamber by the filling liquid is small. In addition, since there is no outer casing for guiding the container opening portion receiver, the size of the handling container is not restricted by the size of the filling valve. Further, by increasing the cross-sectional area of a part of the air vent passage 6, the balance of the residual liquid is easily broken, and the efficiency of the air vent is improved. In summary, according to the present invention, a main body suspended from a liquid tank, and a liquid passage and an air vent passage which are slidably inserted into the main body so as to be vertically slidable, and liquid is introduced downward. A liquid filling valve body with a protruding pipe, and an air vent pipe protruding concentrically outside the liquid introduction pipe at the lower part, and the upper part is slidably inserted through the inner surface of the lower part of the main body and constantly urges downward. And a valve seat body that partially widens the air vent passage formed with the outer surface of the liquid introduction pipe at the center and constitutes a valve together with the air vent valve body, and is fitted to the outer surface of the valve seat body in a vertically slidable manner. And a cylinder which is always urged downward and forms an air pump chamber with the lower part of the valve seat body and further has a compressed air ejection hole formed with an air vent pipe at the lower end of the valve seat body. Press the mouth against the lower end of the cylinder above with the container When the cylinder is pushed up, by reducing the volume of the air pump chamber and positively supplying air into the container from the mouth of the container, without lowering the liquid filling efficiency of the container, and without compressing the liquid, Since the liquid remaining in the air vent pipe at the start of liquid filling can be easily and smoothly forcibly removed, and it is sanitary, and a filling valve of a liquid filling machine which can easily cope with a container having a large body diameter is obtained. The present invention is extremely useful in industry.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway front view of one embodiment of a filling valve of a liquid filling machine of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is an operation change diagram of a filling valve. FIG. 4 is an operation change diagram of a filling valve. FIG. 5 is an operation change diagram of a filling valve. FIG. 6 is an operation change diagram of a filling valve. FIG. 7 is an operation change diagram of a filling valve. FIG. 8 is an operation change diagram of a filling valve. FIG. 9 is a cutaway front view of a conventional liquid automatic injection valve. FIG. 10 is a sectional view taken along line XX of FIG. 9; [Description of Signs] 1 Liquid filling machine 2 Liquid tank 3 Filling valve 4 Main body 5 Liquid passage 6 Air release passage 7 Liquid introduction pipe 8 Liquid filling valve element 9 Air release pipe 10 Air release valve element 11 Valve seat 12 Valve seat Body 13 Spring 14 Air pump chamber 15 Compressed air ejection hole 16 Cylinder 17 Container 18 Spring 19 Air suction hole 20 Reed valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-64902 (JP, A) JP-A-60-118687 (JP, U) JP-A-53-6677 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) B67C 3/00-3/34

Claims (1)

(57) [Claims 1] A main body suspended from a liquid tank, a liquid passage and an air vent passage which are vertically slidably inserted through the main body, and a liquid introduction pipe is formed downward. A liquid filling valve body protruding, and an air vent pipe protruding concentrically outside the liquid introduction pipe at the lower part, and the upper part is slidably inserted into the inner surface of the lower part of the main body and constantly urged downward. And a valve seat body that partially widens an air vent passage formed with the outer surface of the liquid introduction pipe at the center and constitutes a valve together with the air vent valve body, and is fitted to the outer surface of the valve seat body so as to be vertically slidable. A cylinder which is constantly urged downward, forms an air pump chamber with the lower part of the valve seat, and has a compressed air ejection hole formed with an air vent pipe at the lower end of the valve seat. Against the cylinder bottom and press the cylinder with the container. Getatoki filling valve in the liquid filling machine, characterized by positively supplying air into the container from the mouth of the container by reducing the volume of the air pump chamber.