JP2001031195A - Diaphragm-type liquid filling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm-type liquid filling apparatus wherein a driving mechanism of a valve body can be simplified so that adjustment is easy, and even a highly viscous liquid can be accurately supplied and also sucking back is also possible. SOLUTION: A main diaphragm valve 3 including a main diaphragm valve element 4 which can open/close a filling path 2, and a main valve element driver 5 is provided on an upstream of the filling path 2 connected to a filling nozzle 9 to form an aperture 13 on a downstream of the valve 3 of the filling path 2, while bypass paths 17A, 17B connecting between an upstream and a downstream of the aperture 13 are formed. The bypass paths 17A, 17B are equipped with a sub diaphragm valve 6 including a sub diaphragm valve element 7 which can open/close the path 17A and can suck a liquid in the filling nozzle 9 while the valve 3 is closed and a sub valve body driver 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm type liquid filling apparatus for supplying a fixed amount of liquid to a container or the like.

[0002]

2. Description of the Related Art A conventional liquid filling apparatus using a diaphragm valve has been disclosed by the present inventors in Japanese Patent Application Laid-Open No. 9-865.
There is a proposal in Japanese Patent Publication No. 95. In this method, the liquid in the nozzle is sucked by utilizing the elasticity of the diaphragm after the liquid filling is completed, and suck-back for preventing liquid dripping is possible.

[0003]

However, in the above-mentioned conventional configuration, since a single diaphragm switches between high-speed filling, low-speed filling, stop, and suck-back, the driving mechanism becomes complicated and adjustment is difficult. was there. In addition, when a diaphragm valve made of a material having excellent chemical resistance, such as a fluororesin (for example, polytetrafluoroethylene, trade name: Teflon), or a plastic diaphragm valve is used, response characteristics are deteriorated and subtle changes in film surface are caused. Therefore, there was a problem that the flow rate could not be controlled, and the filling accuracy was likely to decrease.

The present invention solves the above problems and provides a diaphragm-type liquid filling apparatus that can simplify a drive mechanism of a valve element, can easily adjust the valve element, can supply it with high precision, and can suck back. With the goal.

[0005]

According to a first aspect of the present invention, there is provided a main diaphragm valve which is capable of opening and closing a filling flow path upstream of a filling flow path connected to a filling nozzle. And a main diaphragm valve having a main valve element driving device, a throttle portion is formed downstream of the main diaphragm valve in the charging path, and a bypass passage connecting the upstream side and the downstream side of the throttle portion is formed. The sub-diaphragm valve body and the sub-valve drive, which can open and close the bypass passage and open the main diaphragm valve in a closed state to suck the liquid in the filling nozzle by the action of the valve membrane. And a sub-diaphragm valve provided with the device.

According to the above construction, the main diaphragm valve is opened, the sub-diaphragm valve is opened, and the container is filled at a high speed from the filling flow path through the filling nozzle, the main diaphragm valve is opened, and the sub-diaphragm valve is closed to perform low-speed filling. Then, filling is stopped by closing the main diaphragm valve and the sub-diaphragm valve, and by opening only the sub-diaphragm valve from this stopped state, the liquid in the filling nozzle can be sucked to suck back and stand by. . Therefore, the main valve body driving device and the sub-valve driving device only need to be an on-off control operation, so that the structure can be simplified and the adjustment can be easily performed.

According to a second aspect of the present invention, in the above structure, the main diaphragm valve body and the sub diaphragm valve body are made of fluororesin. According to the above configuration, the main and sub-diaphragm valve elements are only required to perform simple on-off operations and do not require other fine deformation control. It is possible to provide a filling device which can be supplied and has excellent chemical resistance.

Further, in the invention according to claim 3, a filter for preventing liquid dripping is provided inside the filling nozzle. According to the above configuration, dripping can be effectively prevented by the filter in the filling nozzle.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a diaphragm type liquid filling apparatus according to the present invention will be described with reference to FIGS. The filling device includes a main body block 1 in which a filling flow path 2 is formed, a main diaphragm valve 3 disposed above the main body block 1 and having a main diaphragm valve element 4 and a main valve element driving device 5; The sub-diaphragm valve element 7 and the sub-valve element driving device 8 which are disposed below the block 1
And a filling nozzle 9 attached to the lower portion of the main body block 1 and communicated with the filling flow path 2.

The filling passage 2 has an inflow passage 12 communicating from an upper end connecting portion to a main valve chamber 11 of the upper main diaphragm valve 3, and an intermediate passage connecting from the main valve chamber 11 to a throttle portion 13. 14, a delivery passage 15 in which the throttle portion 13 is connected to the nozzle passage 9 a of the filling nozzle 9, and a sub-valve chamber 16 of the sub-diaphragm valve 6 which communicates with the delivery passage 15 from the upstream intermediate passage 14 of the throttle portion 13. Interposed bypass passage 17
A, 17B.

The main valve chamber 11 is provided with a main diaphragm valve body 4a made of fluororesin (for example, polytetrafluoroethylene) comprising a main valve body 4a capable of opening and closing the inflow passage 12 and a main valve membrane 4b provided therearound. Are arranged. The main valve body driving device 5 is composed of an air cylinder, and the main valve chamber 1
1, a main piston 23 is slidably disposed in a cylinder chamber 22 formed in a main valve case 21 forming an open chamber 22a and a closed chamber 22b.
The leading end of the main valve shaft 24 connected to the main valve 3 is connected to the main valve body 4a.

Therefore, by supplying compressed air from the air unit 25 for supplying compressed air to the opening chamber 22a via the switching valve 26, the main valve body 4a is retracted via the main piston 23 and the main valve shaft 24. Then, the outlet of the inflow passage 12 is opened, and the liquid supplied from the inflow passage 12 is sent out to the intermediate passage 14 via the main valve chamber 11. Further, by supplying compressed air from the air unit 25 to the closing chamber 22 b via the switching valve 26, the main valve body 4 a is projected and urged via the main piston 23 and the main valve shaft 24, so that the main valve body 4 a Thus, the outlet of the inflow passage 12 can be closed, and the liquid supplied from the inflow passage 12 can be stopped.

The sub valve chamber 16 has a bypass passage 17A.
A sub-diaphragm valve body 7 made of a fluororesin (for example, polytetrafluoroethylene), which is composed of a sub-valve element 7a capable of opening / closing an outlet and a sub-valve film 7b provided around the sub-valve element 7a, is provided. In the sub-valve driving device 8, an air cylinder device is formed in a sub-valve case 31 forming a sub-valve chamber 16, and a sub-piston 33 is slidably disposed in the sub-cylinder chamber 32 to open an opening chamber 32 a. And a closing chamber 32b are formed, and the tip of a sub-valve shaft 34 connected to the sub-piston 33 is connected to the sub-valve 7a. Reference numeral 35 denotes an adjusting screw for adjusting the stroke of the auxiliary valve shaft 34.

Therefore, by supplying compressed air from the compressed air supply unit 25 to the opening chamber 32a via the switching valve 26, the sub-valve 7a is retracted via the sub-piston 33 and the sub-valve shaft 34, and the bypass passage Release 17A. Thus, when the main diaphragm valve 3 is open, the liquid supplied from the liquid in the intermediate passage 14 can be delivered to the delivery passage 15 through the throttle portion 13 and the bypass passages 17A and 17B. Can supply liquid. When the main diaphragm valve 3 is in the closed state, the liquid in the filling nozzle 9 flows from the delivery passage 15 through the bypass passage 17B due to the retreat of the sub valve membrane 7b.
And suck-back is performed to prevent dripping.

Further, compressed air is supplied from the compressed air supply unit 25 to the closing chamber 32b via the switching valve 26, and the auxiliary valve body 7a is biased toward the distal end via the auxiliary piston 33 and the auxiliary valve shaft 34. The outlet of the bypass passage 17A is closed by the auxiliary valve element 7a. Thus, when the main diaphragm valve 3 is in the open state, the liquid can be supplied to the filling nozzle 9 only from the throttle unit 13 and charged at a low speed.

In the nozzle passage 9a of the filling nozzle 9,
For example, a mesh filter 18 having a predetermined mesh for preventing foaming and dripping of the liquid is provided in a plurality of layers.
A filling method in the above configuration will be described. 1. High-speed filling As shown in FIG.
By supplying compressed air to the opening chamber 22a of the main valve body driving device 5 and the opening chamber 32a of the sub-valve driving device 8 through the main piston 23 and the sub-piston 33, the main valve body 4a and the sub-valve The body 7a is retracted, the main diaphragm valve 3 and the sub-diaphragm valve 6 are opened, and the liquid supplied to the inflow passage 12 is supplied to the main valve chamber 11, the intermediate passage 14, the throttle 1
It is sent out to the filling nozzle 9 through 3 and the bypass passages 17A and 17B, and supplied to the container at high speed.

2. Low-speed filling When the filling of the container approaches the specified amount from the high-speed filling state, compressed air is supplied to the closing valve chamber 32b of the sub-valve drive device 8 through the switching valve 26 as shown in FIG. Valve element 7
a is protruded to close the outlet of the bypass passage 17A. As a result, the liquid in the intermediate passage 14 is supplied to the filling nozzle 9 only from the throttle section 13 and is charged at a low speed.

3. Stop filling As shown in FIG. 3, when the filling of the container reaches a specified amount,
Compressed air is supplied from the switching valve 26 to the closing chamber 22 b of the main valve body driving device 5, the main valve body 4 a is projected, and the inflow passage 12
Is closed, and the liquid supplied from the inflow passage 12 is stopped.

4. Suckback / Standby After the stop, compressed air is supplied from the switching valve 26 to the closing chamber 32a, the sub-valve 7a is retracted, the bypass passage 17A is opened, and the sub-valve membrane 7b is retracted. The liquid in the sub-valve chamber 16 is passed through the bypass passage 17B.
Then, suckback is performed, and the dripping from the nozzle passage 9a is prevented in combination with the effect of the filter 18.

According to the above-described embodiment, the main valve driving device 5 and the sub-valve driving device 8 need only be on-off control operations, so that the structure can be simplified and the adjustment can be easily performed. be able to. Also, the valve membranes 4b, 7b
The complicated operation of suck-back and low-speed filling by only the operation is not required, and only the on-off operation of the diaphragm valve elements 4 and 7 is performed. Even if the diaphragm valves 4 and 7 are formed, the supply can be controlled with sufficient accuracy even if the diaphragm valves 4 and 7 are formed due to the chemical resistance but the response characteristics are somewhat lower.

In the above-described embodiment, the driving source of the valve body driving devices 5 and 8 is high-pressure air, but may be a hydraulic or electric actuator.

[0022]

As described above, according to the first aspect of the present invention, the main diaphragm valve is opened, the sub-diaphragm valve is opened, and the container is filled at a high speed from the filling flow path through the filling nozzle. To close the sub-diaphragm valve at low speed, close the main diaphragm valve, close the sub-diaphragm valve to stop filling, and open only the sub-diaphragm valve from this stopped state to discharge the liquid in the filling nozzle. Can suck and suck back and wait. Therefore,
The main valve driving device and the sub-valve driving device need only be an on-off control operation, and the structure can be simplified and the adjustment can be easily performed.

According to the second aspect of the present invention, since the main and auxiliary diaphragm valve elements need only perform simple on-off operations and do not require other fine deformation control, the fluororesin has a somewhat low response characteristic. It is possible to provide a filling device which can be supplied with high accuracy even if it is manufactured, and has excellent chemical resistance.

According to the third aspect of the present invention, dripping can be effectively prevented by the filter in the filling nozzle.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a diaphragm type liquid filling apparatus according to an embodiment of the present invention and in a high-speed filling state.

FIG. 2 is a longitudinal sectional view showing a low-speed filling state of the liquid filling apparatus.

FIG. 3 is a vertical cross-sectional view showing a filling stop state of the liquid filling apparatus.

FIG. 4 is a longitudinal sectional view showing a suck-back state of the liquid filling apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body block 2 Filling flow path 3 Main diaphragm valve 4 Main diaphragm valve 4a Main valve 4b Main valve membrane 5 Main valve driving device 6 Sub-diaphragm valve 7 Sub-diaphragm valve 7a Sub-valve 7b Sub-valve 8 Sub-valve driving Apparatus 9 Filling nozzle 11 Main valve chamber 13 Restrictor 16 Sub-valve chamber 17A, 17B Bypass passage 18 Filter

Claims (3)

[Claims] 1. A main diaphragm valve having a main diaphragm valve body capable of opening and closing the filling flow path and a main valve body driving device is provided upstream of a filling flow path connected to a filling nozzle. A throttle portion is formed downstream of the main diaphragm valve, and a bypass passage connecting the upstream side and the downstream side of the throttle portion is formed. The bypass passage can be opened and closed in the bypass passage.
A sub-diaphragm valve having a sub-diaphragm valve body and a sub-valve element driving device capable of sucking liquid in the filling nozzle by the action of the valve membrane by opening the main diaphragm valve in a closed state is provided. Diaphragm type liquid filling device. 2. The diaphragm type liquid filling apparatus according to claim 1, wherein the main diaphragm valve element and the sub diaphragm valve element are made of fluororesin. 3. A diaphragm type liquid filling apparatus according to claim 1, wherein a filter for preventing liquid dripping is provided inside the filling nozzle.