JPS5940320Y2 - liquid filling valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to liquid filling nozzles, and more particularly to a liquid filling valve for a liquid filling nozzle useful for use in a gravimetric liquid drum filling machine.

BACKGROUND ART A liquid filling nozzle equipped with a filling valve that is controlled in conjunction with a measuring machine is used not only for drum filling but also for quantitative filling machines that measure and fill a fixed amount of liquid into various containers.

A multi-stage control method is generally adopted as a control method for the filling valve, that is, a control method for the liquid filling nozzle.

In this method. The liquid filling nozzle "Starts filling"
In response to a signal, the filling container is inserted into the filling port by a specified length, and first, the valve body of the filling valve is fully opened and most of the filling amount is filled, for example, 8.
It is operated to fill the valve with a volume of 0 to 95, then leave the valve body half open and fill the remaining volume at a small flow rate.

As mentioned above, the movement of these valve bodies is normally controlled by signals from a weighing machine that continuously measures the weight of the liquid filled in the container.

One problem with liquid filling nozzles using the multi-stage control system as described above is that after liquid filling is completed, that is, after the filling valve is completely closed, the liquid that adheres to the valve body guide of the filling valve and remains inside the filling valve. The liquid dripped from the tip of the filling nozzle, that is, the tip of the filling valve, contaminating the filling work environment.

Further, such dripping of liquid after filling is completed results in wasted liquid.

Therefore, the main objective of the present invention is to provide a filling valve that can prevent residual liquid from dripping out of the filling valve after filling is completed.

Next, the liquid filling valve according to the present invention will be explained in detail with reference to the drawings.

The liquid filling valve 2 according to the present invention is provided at the tip of the liquid filling nozzle 1, as understood with reference to FIG.

The filling valve 2 includes a valve body 4 and an outer housing 6 surrounding the valve body 4.

The valve body 4 and the outer housing 6 are configured to perform relative movement by a valve control device (not shown) to open and close the filling valve 2, that is, the liquid filling nozzle 1.

Although it is also possible to fix the outer housing 6 and move the valve body 4, in this embodiment, the explanation will be made assuming that the valve body 4 is fixed and the outer housing 6 moves in the axial direction.

Further, the filling valve 2 or the liquid filling nozzle 1 itself is configured to be able to move integrally in the vertical direction.

Furthermore, to explain the filling valve 2 in detail, the valve body 4
The distal end portion of the valve body guide 8 is configured to be able to fit into and close the filling discharge hole 10 of the outer housing 6.

The tip 12 of the valve body guide 8 has a conical shape, and when the filling valve 2 is fully open, an annular liquid flow is formed between the tip 12 and the upper shoulder 14 of the filling discharge hole 10, as shown in FIG. A passage 16 is formed, and in the fully closed state, as shown in FIG. 2, it protrudes from the tip of the filling discharge hole 10.

At the center of the valve body 4. That is, a reduced diameter area 18 is provided in the upper part connected to the valve body guide 8, and as shown in FIG. An annular groove 20 is formed in.

The function of the annular groove 20 will be described later.

Furthermore, a horizontal hole 22 is provided by drilling the reduced diameter region 18 in the radial direction, and a vertical hole 24 is provided in communication with the horizontal hole 22 in the axial direction of the valve body guide 8.

An overflow detection nozzle 26 is disposed at the lower end of the outer housing 6, and an outlet 28 of the detection nozzle 26 opens downward, that is, parallel to the axis of the liquid filling valve 2.

In addition, a drip-proof nozzle 3 is provided at the lower end of the outer housing 6.
0, and its opening 32 opens into the annular groove 20 formed by the valve body 4 and the discharge hole 10 when the filling valve 2 is in the fully closed state, as shown in FIG. .

Next, the operation of the liquid filling valve according to the present invention will be explained.

As shown in FIG. 2, the liquid filling nozzle 1 is inserted into the inlet opening of the container to be filled and set at a predetermined position, with the filling valve 2 kept in a fully closed state by a filling start signal. .

Next, the housing 6 is moved downward by a valve control device (not shown), and the filling valve 2 is fully opened as shown in FIG.

As a result, the filling liquid is filled into the container at a large flow rate through the annular fluid flow passage 16 and the discharge hole 10 formed by the valve body 4 and the discharge hole 10, as indicated by the arrow a.

When a metering device (not shown) detects that the amount of liquid in the container has reached, for example, 90% of the total filling amount, a large-capacity constant-flow valve and a small-capacity constant-flow valve installed upstream of the nozzle are activated. Among them (not shown), the large capacity constant flow valve is closed, and only the small capacity constant flow valve is used for filling.

When the meter detects that the predetermined amount of liquid has been filled, this signal is sent to the valve control device, and the small-capacity constant flow valve is fully closed, and the housing 6 moves upward, causing the filling valve 2, that is, the liquid The filling nozzle 1 is fully closed (FIG. 2), and filling of liquid is completely stopped.

In addition, if the above large capacity and small capacity constant flow valves are not used in parallel, as shown in Fig. 3,
After the amount of liquid in the container reaches, for example, 90%, it is possible to move the filling valve 6 upward by the valve control device and maintain the filling valve 2 in a half-open state to perform filling at a small flow rate. be.

As a result, the filling liquid is filled at a small flow rate through the horizontal hole 22 and vertical hole 24 provided inside the valve body 4, as indicated by the arrows.

When the measuring machine detects that the predetermined amount of liquid has been filled, it sends a signal to the valve control device to move the housing 6 further upwards, and the filling valve 2 is shown in FIG. The fully closed state is established, and the filling of liquid from the liquid filling nozzle 1 is completely stopped.

At this time, the liquid filling nozzle 1 is moved upward and a suction force is applied to the drip-proof nozzle 30, and the annular groove 2
0, the residual liquid existing in the horizontal hole 22 and the vertical hole 24 is collected through the drip-proof nozzle 30, so that the liquid drips from the discharge hole 10 at the tip of the filling valve 2, that is, the tip of the liquid filling nozzle 1. There is the advantage that fouling of the filling machine etc. is avoided.

Further, a fluid such as air or nitrogen is blown out from the outlet 28 of the overflow detection nozzle 26 toward the liquid level XX.

In the unlikely event that liquid filling is continued despite the completion of filling due to one of the reasons mentioned above, the liquid level will continue to rise further than X-x when filling is normally completed, and an overflow will eventually occur. The level of Xo-Xo is reached (see Figure 2).

However, since the overflow detection nozzle 26 is provided, the liquid level x'-
At time x', the overflow detection nozzle 26
An overflow detector (not shown) connected to detects the increase in backpressure.

The detection signal of the fluctuation in the back pressure of the overflow detection nozzle is amplified by an amplifier, and the output signal immediately activates the emergency automatic stop device, which issues an overflow alarm and at the same time moves the liquid filling nozzle 1 upward. The large and small flow rate valves are fully closed, the filling is completed, and the liquid filling operation is stopped.

This prevents overflow.

One embodiment of the overflow prevention system is illustrated in FIG.

The overflow detection nozzle 26 needs to be provided adjacent to the liquid filling discharge hole 10, but the inner diameter of the nozzle 26, the shape of the nozzle outlet 28, and the distance from the container liquid level to the nozzle outlet 28 Y (Y'), etc. are appropriately selected according to your wishes. Here, to give an example: Housing discharge hole inner diameter: 40 mm Overflow detection nozzle inner diameter: 4 mm Air or nitrogen pressure crab 0.01 to 3 kg/ It is considered as a CD,
Good results can be obtained by setting Y'=24 mm and Y=40 mm.

In particular, the liquid filling valve according to the present invention forms an annular groove 20 between the valve body 4 and the inner wall surface of the filling discharge hole 10 when the filling valve 2 is brought into a fully closed state. A drip-proof nozzle 30 is provided to open into the annular groove 20, and by applying a suction force to the drip-proof nozzle 30, residual liquid existing in the annular groove 20, the horizontal hole 22, and the vertical hole 24 is removed. Because it is configured to be collected through a nozzle,
This has the effect of preventing the liquid from dripping from the tip of the filling valve 2 and thereby contaminating the filling machine and the working environment in its vicinity.

Such a feature also provides the benefit of not wasting valuable fill liquid.

Furthermore, the filling valve according to the present invention has a simple structure as described above, can be expected to operate with high reliability, and is extremely practical.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a liquid filling valve for a liquid filling nozzle according to the present invention, showing a fully open state. FIG. 2 is a diagram similar to FIG. 1, but depicts a fully closed state. FIG. 3 is a view similar to FIG. 1, but in a half-open state. FIG. 4 is a block diagram representing one embodiment of an overflow prevention system. 1: Liquid filling nozzle, 2: Filling valve, 4: Valve body. 6: Outer housing, 8: Valve body guide, 10: Discharge hole,
24: Drip-proof vertical hole, 26: Overflow detection nozzle, 2
8: Air blowing opening, 30: Drip-proof nozzle.

Claims (1)

[Scope of utility model registration request] The liquid-filled valve is equipped with a valve body 4 and an outer housing 6, and the valve body and the outer housing 6 move relative to each other to open and close the valve, and the outer housing 6 includes: The valve body 4 has a cylindrical filling discharge hole 10 at its tip; the valve body guide 8 is capable of fitting into the filling discharge hole 10 and closing the filling discharge hole 10.
．． , a reduced diameter region 18 formed in the upper portion connected to the valve body guide 8, a horizontal hole 22 formed by drilling the reduced diameter region 18 in the radial direction, and one end communicating with the horizontal hole 22. The other end is provided with a vertical hole 24 formed by drilling in the axial direction of the valve body guide so as to open to the outside; An annular groove 20 is formed between the inner wall surface of the filling discharge hole 10; and an annular groove 20 is formed adjacent to the upper end of the filling discharge hole 10 so as to open into the annular groove 20 when the liquid filling valve is in a fully closed state. A drip-proof nozzle 30 is arranged, and by applying a suction force to the drip-proof nozzle 30, the liquid present in the annular groove 20, the horizontal hole 22, and the vertical hole 24 is collected through the drip-proof nozzle 30. A liquid filling valve characterized in that it is capable of