JP2002154600A - Valve for automatic liquid filling machine and filling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve for an automatic liquid charging machine and a charging method for a range of utilization usable for a charging of low viscosity liquid as well as a charging of high viscosity liquid. SOLUTION: There is provided a valve for an automatic charging machine for charging liquid into a container and a charging method in which the valve includes a valve having its valve member acted to ascend or descend in a substantially vertical flow passage; the valve member is comprised of a connecting segment 3 for a valve rod 1, a valve disk 4 capable of being closely contacted with a valve seat 6, and a disk holder 5 having the valve disk fixed to the connecting segment; and the disk holder is of a column-like shape associated with a lower segment of the valve seat and capable of being fitted to a cylindrical pipe guiding liquid to the container and an end corner 9 not contacted with the column-like valve stick is processed with a finish of curved surface of radius of curvature of 1 to 5 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for an automatic liquid filling machine and a filling method using the same. More specifically, the present invention relates to an excellent valve for an automatic liquid filling machine which can be used for filling a low-viscosity liquid and a high-viscosity liquid and has a wide use range, and a filling method using the same.

[0002]

2. Description of the Related Art Liquid products such as chemicals and foods are filled in containers such as drums and transported to destinations. Liquid products are diverse, and automatic liquid filling machines are also being developed for special purpose machines that are suitable for the properties of liquids.With the diversification of market needs, especially for industrial products, high-mix low-volume production is required. It became so. For this reason, a liquid automatic filling machine that can handle filling of liquid products of various properties with one unit is required. The liquid product is transferred from the product tank to the filling facility by piping, and a predetermined amount is measured and filled into the container and sealed.However, this measuring and filling facility requires a valve to open and close the flow of the liquid product in the piping. is there.

[0003] Filling of a liquid product is mainly carried out by pouring into a container using gravity. Conventionally, in this method, a valve is used in which a valve element is moved up and down in a substantially vertical flow path. Was. That is, when the valve body rises and opens between the valve seat, the liquid product flows down from there and is guided to the nozzle to fill the container, and when the filling amount reaches a predetermined amount, the valve body descends and the valve disk is moved. The valve closes and closes the valve seat to stop the flow of the liquid product. In order for the valve to be completely closed, the contact between the valve disc and the valve seat must be perfect, and in order to achieve this, the disc holder below the valve disc is ring-shaped with a screw provided on its top. The valve disc is fixed to the connecting portion, and the lower portion has a shape that fits completely into the nozzle and guides the valve body to descend.

In the case of this type of valve, since the valve body is raised and lowered by a valve stem connected to the outside of the pipe, the pipe for the liquid product is usually bent at a right angle before being connected to the valve. In addition, in order to open the valve, the lower end of the disc holder needs to be above the valve seat, so that the stroke of the valve stem rises and falls. Also, this type of valve needs to provide a sufficient space between the valve body and the valve box so that the liquid product easily flows down when filling the container with the liquid product, and is a part of the valve body. Except for the lifting guide, the valve body and the valve box do not come into contact with each other, and a gap is also provided between the lifting guide and the valve box to reduce the vibration of the valve body caused by the lifting operation by the valve rod and the flow of the liquid product. It has a structure that can be absorbed.

When a valve having the above structure is used as a valve for an automatic liquid filling machine, there is no particular problem in filling a liquid product having a relatively high viscosity, but it is often difficult to fill a liquid product having a relatively low viscosity. There is a problem that the disc holder does not fit into the nozzle, the lower end of the disc holder rides on the valve seat, and the valve does not close.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and a valve for a liquid automatic filling machine which can be used for filling a low-viscosity liquid or a high-viscosity liquid and has a wide range of use. It is an object of the present invention to provide a filled filling method.

[0007]

SUMMARY OF THE INVENTION The present inventor has conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, the filling of a liquid product having a relatively low viscosity has resulted in the filling of a liquid product having a relatively high viscosity. When the valve element descends due to the vibration of the valve element that cannot be seen, the lower end of the disc holder causes the valve seat to ride on the valve seat, and the vibration at the end of the disc holder that is not in contact with the valve disc. We have found that corners can be reduced by a curved surface with a specific radius of curvature, and based on this finding we have completed the present invention.

That is, the present invention has the following configuration. (1) A valve for an automatic filling machine that fills a container with a liquid, the valve including a valve that operates by moving a valve body up and down in a substantially vertical flow path, wherein the valve body is connected to a valve stem; A valve disc that can be in close contact with the valve seat, and a disc holder that fixes the valve disc to the connecting portion, wherein the disc holder has a shape that can be fitted to a nozzle that accompanies the lower portion of the valve seat and guides liquid to the container, and The corner of the end of the disc holder that is not in contact with the valve disc has a radius of curvature of 1 to 5 m.
A valve for an automatic liquid filling machine, characterized by having a curved surface finish of m.

(2) The valve for an automatic liquid filling machine according to the above (1), wherein a gap between the nozzle and the disk holder is 0.1 to 0.3 mm except for a curved surface finished portion of the disk holder.

(3) A filling method using the valve for an automatic liquid filling machine according to the above (1) or (2).

[0011]

Embodiments of the present invention will be described below with reference to schematic diagrams. FIG. 1 is a schematic view showing a cross section of a valve for a liquid automatic filling machine. The liquid product flowing from the valve inlet A flows down to the container from the valve outlet B, and when a certain amount of the liquid product is filled in the container, the valve is pushed by the valve rod 1 which is lowered by a force such as air pressure or hydraulic pressure. Moves down the inside of the valve box while bringing the rib 8 protruding from the connecting portion 3 into contact with the inner surface of the valve box 2 as a guide for elevating and lowering.
Is fitted to the nozzle 7.

In the present invention, the term “fit” means that the disk holder 5 and the nozzle 7 are fitted exactly. Since the gap between the disk holder 5 and the nozzle 7 is small, the disk holder 5 is attached to the inner surface of the nozzle 7 and the vertical surface of the disk holder 5. The valve disc 4 descends along the nozzle 7 while discharging the remaining liquid product, and the valve disk 4 comes into close contact with the valve seat 6 located above the nozzle 7 to stop the flow of the liquid product. A part of the remaining liquid product also acts as a lubricant between the vertical surface of the disk holder 5 and the inner surface of the nozzle 7 which descend.

The filling of the liquid product needs to be performed efficiently in a short time, and the opening and closing of the valve is also performed in a short time by using air pressure, hydraulic pressure and the like. As the speed at which the liquid product passes through the valve increases, the valve body tends to vibrate. If the viscosity of the liquid product is relatively high, the vibration width is small and there is no particular problem, but if the viscosity of the liquid product decreases, the vibration width at the lower end of the disk holder 5 away from the fulcrum rib 8 Becomes larger and the disc holder 5 is closed when the valve is closed.
A phenomenon may occur that the lower end of the vehicle rides on the valve seat 6 and the valve cannot be closed.

As a result of the investigation, it was presumed that one of the causes of the vibration was that a vortex was generated on the lower end surface of the disk holder 5 when the low-viscosity liquid product passed through the valve. As a result of examining measures to suppress the vibration, the lower end of the disk holder 5, that is, the corner of the end not in contact with the valve disk, is finished to a curved surface with a radius of curvature of 1 to 5 mm, preferably 1.5 to 4 mm. The disadvantage that the lower end of the disk holder 5 is suppressed and rides on the valve seat 6 is also solved. If the radius of curvature is less than 1 mm, the vibration suppressing effect may be insufficient. In the present invention, finishing a curved surface with a radius of curvature of 1 to 5 mm is not limited to simply forming a curved surface portion into an arc shape of a quarter of a circle having a radius of 1 to 5 mm, but an elliptical arc shape, a straight line, or the like. And a curved surface finish that has an effect equivalent to that of a quarter of a circle having a radius of 1 to 5 mm.

The effect of making the gap between the disk holder 5 and the nozzle 7 small is to make the valve disk 4 completely adhere to the valve seat 6 and also to prevent dripping when the valve is closed. If the gap is 0.1-0.3mm,
Preferably, it is 0.1 to 0.2 mm.
If the radius of curvature exceeds 5 mm in the curved surface finish of the lower end corner of the disk holder 5, there is a possibility that liquid dripping may occur. Note that the shape of the disk holder and the nozzle is preferably cylindrical in order to facilitate fitting. In this case, the ratio L / D of the diameter (D) to the length (L) of the cylindrical shape is 0.5. ~ 4
Is preferred.

In the present invention, the material of the parts constituting the valve is strength, chemical resistance, and resistance to repeated opening and closing operations.
It can be appropriately selected in consideration of the performance required for parts such as wear resistance, but the material of the valve disc 4 is fluororesin (Teflon (registered trademark)), the material of the valve box 2 is cast iron, and the material of other parts is Can be exemplified by stainless steel.

The valve of the present invention is often used for opening and closing a flow path by providing a flow control valve upstream of a pipe. May be used.

[0018]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited thereto. In addition, the viscosity of the liquid product was measured at 20 ° C. according to JIS K 7117 “Testing method of liquid resin by rotational viscometer” S method.

Example 1 A valve disk was made of fluororesin (Teflon), a nozzle 7 was made of stainless steel having a diameter of 40.0 mmφ and a length of 100 mm, and a disk holder 5 was made of 100 mm in length and 39.6 mm in diameter. Excluding), a schematic diagram 1 in which the gap between the nozzle and the disk holder is 0.2 mm, and the radius of curvature of the lower end corner of the disk holder 5 is 4 mm made of stainless steel.
A, a product B (viscosity of 1.4 mPa · s), a product B (viscosity of 18 mPa · s) and a product D (viscosity of 18 mPa · s) using a commercially available liquid automatic filling machine equipped with a valve such as Drum filling of four liquid products (viscosity of 74 mPa · s) was carried out at a chemical factory in Chiba Prefecture. The results are shown in Table 1. In all four liquid products, there was no problem that the lower end of the disk holder 5 got on the valve seat 6, and no dripping when the valve was closed was observed.

Comparative Example 1 A drum can was filled in the same manner as in Example 1 except that the radius of curvature of the lower end angle of the disk holder 5 was 0.4 mm. The results are shown in Table 1. As shown in Table 1, the lower end of the disc holder 5 runs on the valve seat 6 in the three types of liquid products except the product D, the product A, the product B, and the product C. The failure occurrence frequency is the occurrence frequency when 100 drums are filled. No liquid dripping when the valve was closed was observed for any of the four products.

Comparative Example 2 A drum can was filled in the same manner as in Example 1 except that the radius of curvature of the lower end angle of the disk holder 5 was 8 mm. The results are shown in Table 1. As for the four types of liquid products, the dripping occurred when the valve was closed and the working environment became worse, so the test was terminated in one day. The number of fillings was less than 10 for each of the four liquid products.

[0022]

[Table 1]

[0023]

The valve of the present invention can be used for filling a low-viscosity liquid or a high-viscosity liquid, has a wide range of use, and is suitable as a valve for a liquid automatic filling machine with almost no dripping.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of a valve for an automatic liquid filling machine.

[Explanation of symbols]

 A: Liquid product valve inlet B: Liquid product valve outlet (to container) 1: Valve stem 2: Valve box 3: Connection 4: Valve disc 5: Disc holder 6: Valve seat 7: Nozzle 8: Rib 9: Finishing part of disc holder

Claims (3)

[Claims] 1. A valve for an automatic filling machine for filling a container with a liquid, the valve including a valve operated by moving a valve body up and down in a substantially vertical flow path, wherein the valve body is connected to a valve stem. Part, a valve disk that can be in close contact with the valve seat, and a disk holder that fixes the valve disk to the connection part, the disk holder having a shape that can be fitted to a nozzle that is attached to the lower part of the valve seat and guides liquid to the container. And the corner of the end of the disc holder not in contact with the valve disc has a radius of curvature of 1
A valve for an automatic liquid filling machine, characterized by having a curved surface finish of up to 5 mm. 2. A gap between a nozzle and a disk holder,
Except for the curved part of the disc holder
The valve for an automatic liquid filling machine according to claim 1, which is 0.3 mm. 3. A filling method using the valve for an automatic liquid filling machine according to claim 1.