JPH09226894A - Liquid feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid feeding device in which the device is simplifled and the liquid of the correct quantity can be fed. SOLUTION: A measuring pump 17 is connected to a container body 11. A main pipe 19 for dropping the liquid is provided on the container body 11. A first inlet 22 is provided in the main pipe 19 above a bottom part of the container body 11. A micro-measurement hole 23 is provided below the first inlet 22. An opening/closing valve 20 is provided on the downstream side of the micro-measurement hole 23. After the pump is stopped, the liquid A left in the container body 11 is naturally dropped, and because a small amount of the liquid A is dropped from the micro-measurement hole 23, the liquid of the correct quantity can be fed by closing the opening/closing valve 20.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid supply device for supplying a predetermined amount of liquid.

[0002]

Conventionally, various devices have been used to supply a predetermined amount of a relatively large amount of liquid. For example, in a factory, when manufacturing ready-mixed concrete, a device as shown in FIG. 5 is used to supply a predetermined amount of an admixture, and a pump 1 for pumping the admixture in a container (not shown) is provided. A large-diameter main pipe 2 and a small-diameter thin pipe 3 are provided downstream of the pump 1, and a return pipe 4 for returning the liquid A sent from the pump 1 is provided.
The main pipe 2 and the thin pipe 3 are provided with valves 2A and 3A, respectively, and the valve 2A on the main pipe 2 side is opened to set a predetermined amount of, for example, 9
After supplying about 0%, the valve 2A on the main pipe 2 side is closed, the valve 3A on the narrow pipe 3 side is opened, and the remaining about 10% is supplied to supply a predetermined amount of the admixture.

Then, by supplying the remaining about 10% by the thin tube 3, fine adjustment becomes possible and accurate supply becomes possible. However, in this method, the valves 2A and 3A are provided in the main pipe 2 and the thin pipe 3, respectively, and the return pipe 4 is also required, which complicates the apparatus and normally drives the pump 1 until the supply is completed. Therefore, although the return pipe 4 is provided, there is a problem that a water hammer is generated when the valve 2A is closed and the pumps 2A and 3A and the pipeline are easily damaged.

Therefore, the present invention aims to simplify the device,
An object of the present invention is to provide a liquid supply device capable of supplying an accurate amount.

[0005]

According to a first aspect of the present invention, there is provided a container main body connected to a liquid supply means, a liquid dropping main pipe communicating the inside and the outside of the container main body, and the main pipe is provided upstream of the main pipe. A first inlet provided above the bottom of the container body, and a second inlet having a diameter smaller than that of the main pipe, which communicates the inside of the container body and the inside of the main pipe below the first inlet. An opening / closing valve provided in the main pipe downstream of the second inflow port is provided, and the liquid sent from the liquid supply means to the container body passes through the main pipe from the first and second inflow ports. Supplied, and after supplying a predetermined amount of liquid,
Stop the pump. After the pump is stopped, the liquid remaining in the container body naturally flows down, and the liquid is gradually dropped and supplied from the second inlet, and when the predetermined amount is reached, the open / close valve is closed.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention, in which a container body 11 is formed in an almost sealed shape by an upper surface 12, a lower surface 13 and side surfaces 14 surrounding four sides, and a supply port 15 is formed in the container body 11. Then, a metering pump 17 is connected to the supply port 15 through a pipe line 16, and the metering pump 17 sends the liquid A such as an admixture from the liquid supply source 18 to the container body 11. A liquid dropping main pipe 19 (hereinafter referred to as a main pipe 19) is inserted into the lower surface 13 of the container body 11, and the main pipe 19 connects the container body 11 and the outside of the lower portion of the container body 11. The main pipe 19 is provided with an electric opening / closing valve 20 such as a ball valve, and the valve body 21 of the valve 20 operates to open / close the main pipe 19. A first inlet 22 is provided in the container body 11 at an upper portion of the main pipe 19, and a second inlet 22 is provided at a position lower than the first inlet 22. A fine measuring hole 23 is provided as an inlet. In the figure, reference numeral 24 is a receiver, and an input port 26 having an opening / closing lid 25 is formed in the lower part.

Reference numeral 31 is a metering control means composed of a computer or the like. The metering control means 31 is based on a detection signal from a sensor 32 provided in the receiver 24, and the metering pump 17
And controlling the operation of the on-off valve 20. In this example, the sensor 32 is a sensor that detects at least the predetermined amount position T and the liquid level height near the rough measuring position Ta that is approximately 90% of the predetermined amount, and a liquid near these heights. A weight detection sensor or the like for detecting the weight of is used.

Next, the method of using the liquid metering and supplying apparatus will be described. First, when the metering pump 17 feeds the liquid A into the container body 11 with the opening / closing valve 20 opened, this liquid A becomes the first. It is supplied from the inflow port 22 through the main pipe 19 to the receiver 24. In this case, the liquid A also flows into the main pipe 19 from the fine measuring hole 23. Then, when the liquid A is supplied to the rough measuring position, the measuring pump 17 is stopped, and thereafter, the liquid level of the container body 11 is lowered and the liquid level is the first inlet 22.
In the following cases, as shown in FIG. 2, the remaining liquid A naturally drops from the fine measuring hole 23 through the main pipe 19, and when a predetermined amount of liquid is supplied, the opening / closing valve 20 is closed. In the state of FIG. 2, the lower end of the main pipe 19 is open, and a relatively small amount of liquid A is supplied to the main pipe 19 from the fine metering hole 23 having an opening area smaller than that of the first inlet 22. External air is supplied from the main pipe 19 into the container body 11, and the liquid A is supplied corresponding to the height of the liquid level in the container body 11.

In supplying the liquid A as described above, the measuring control means 31 performs the following control. First, the metering control means 31 outputs an opening / closing signal to the opening / closing valve 20 to open the opening / closing valve 20, outputs a drive signal to the metering pump 17 to drive the pump 17, and transfers the liquid A to the container body 11. send. Receptor 24
When the liquid A is supplied to the rough metering position Ta, the sensor 32 detects it and outputs a stop signal to the metering pump 17 to stop the pump 17. After that, the liquid A remaining in the container body 11 is naturally dropped and supplied to the receiver 24.
The liquid A is supplied little by little through the fine metering hole 23, and the open / close valve 20 is closed at a predetermined position by a detection signal based on the liquid amount from the sensor 32. In this case, the amount of the liquid A falling between the valve closed position indicated by the height H and the liquid surface is calculated in advance, and when the liquid A is supplied to the position subtracted by the amount of the liquid A, Showing sensor
A closing signal is output to the opening / closing valve 20 by the detection signal of 32 to close the opening / closing valve 20. That is, after the valve 20 is closed from the state of FIG. 2, the liquid A having the volume shown in the height h drops and the liquid A is supplied to the predetermined amount position T. The sizes of the container body 11 and the main pipe 19 are set so that the amount of residual liquid in the container body 11 is larger than that of the liquid A having the height h.

As described above, in this embodiment, the container body 11 connected to the metering pump 17 serving as the liquid supply means and the container body 11
A liquid dropping main pipe 19 that communicates the inside and the outside of the pipe 11, a first inlet 22 provided upstream of the main pipe 19 and above the bottom of the container body 11, and from the first inlet 22. A fine measuring hole 23, which is a second inlet port having a diameter smaller than that of the main pipe 19 and which communicates the inside of the container body 11 and the inside of the main pipe 19 at the lower side, and the fine measuring hole.
The liquid A sent to the container body 11 by the metering pump 17 is supplied through the main pipe 19 and has a predetermined amount of the liquid A because it is provided with the opening / closing valve 20 provided in the main pipe 19 downstream from 23. After the pump 17 is stopped, the liquid A remaining in the container body 11 naturally flows down after the pump 17 is stopped, and the liquid A is gradually supplied from the fine measuring hole 23 little by little. It can be closed to deliver an accurate amount. Also, compared to conventional devices that require a main pipe, a thin pipe, and a return pipe,
The device can be simplified and the price can be reduced.
Since only one is required, it is inexpensive and easy to operate. Further, in this device, since the valve 20 is closed at the end of the supply, it is not necessary to close the valve while driving the pump as in the conventional case, and an unreasonable force is not applied to the device.

Further, as an effect of the embodiment, the fine measuring hole 23
Has a structure in which a hole is formed in the main pipe 19, and therefore the structure is simple. Furthermore, by changing the size of the fine measuring hole 23, the supply speed can be easily changed, and the accuracy can be improved. For high supply, the fine measuring hole 23 may be made small. Further, since the metering control means 31 for controlling the operations of the pump 17 and the valve 20 and the sensor 32 for detecting the amount of the supplied liquid A are provided, automatic metering and supply becomes possible. Furthermore, by using it to supply the admixture that is included in the kneading volume of concrete, the amount of admixture can be measured and supplied with higher accuracy than before, and since the structure is simple, repair and replacement are possible. It is easy and can be repaired and replaced in a short time.

FIG. 4 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. Fine measuring hole
23 is not provided, the lower surface 13 of the container body 11 and the main pipe 19
The outside of the container body 11 is connected by a bypass pipe 41 having a diameter smaller than that of the main pipe 19.
In this example also, when the metering pump 17 is stopped, the residual liquid in the container body 11 is bypass pipe 41.
It falls naturally while passing through.

As described above, in this embodiment, the container body 11 connected to the metering pump 17 serving as the liquid supply means and the container body
A liquid dropping main pipe 19 that communicates the inside and the outside of the pipe 11, a first inlet 22 provided upstream of the main pipe 19 and above the bottom of the container body 11, and from the first inlet 22. A bypass pipe 41, which is a second inlet port having a diameter smaller than that of the main pipe 19 and which communicates the inside of the container body 11 and the inside of the main pipe 19 below, and an opening / closing valve 20 provided in the main pipe 19 downstream of the bypass pipe 41. Therefore, the same operation as in the first embodiment,
Has an effect.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the present invention. For example, not only the admixture of the embodiment,
The device of the present invention can be used for metering various liquids such as liquid chemicals. Also, a plurality of second inlets may be provided,
Also in this case, the total cross-sectional area of the plurality of second inlets may be smaller than that of the first inlet. Further, various types of pumps and valves can be used, and in the case of automatic control, electrically operated ones are preferable.

[0015]

According to the first aspect of the present invention, the container body connected to the liquid supply means, the liquid dropping main pipe communicating the inside and outside of the container body, and the bottom of the container body provided upstream of the main pipe. A first inlet provided above, a second inlet having a diameter smaller than that of the main pipe, which communicates the inside of the container body and the inside of the main pipe below the first inlet, and the second inlet. An on-off valve provided in the main pipe downstream of the inflow port is provided, so that the device can be simplified and a liquid measuring and supplying device capable of supplying an accurate amount can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which a liquid is supplied by a main pipe according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a state in which a residual liquid in the container body is supplied according to the first embodiment of the invention.

FIG. 3 is a cross-sectional view showing the first embodiment of the present invention after the valve is closed.

FIG. 4 is a cross-sectional view showing a state in which the residual liquid in the container body is supplied showing the second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional device.

[Explanation of symbols]

 11 Container body 17 Metering pump (liquid supply means) 19 Main pipe 20 Open / close valve 22 First inlet 23 Fine measuring hole (second inlet) 41 Bypass pipe (second inlet)

Claims (1)

[Claims] 1. A container main body connected to a liquid supply means, and a liquid dropping main pipe that connects the inside and the outside of the container main body.
A first inlet provided upstream of the main pipe and above the bottom of the main body of the container, and a first inlet which communicates the inside of the main body with the inside of the main pipe below the first inlet and has a diameter smaller than that of the main pipe. And a switching valve provided on the main pipe downstream of the second inlet.