JPH1017091A - Constant volume discharge device of liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air bubbles from generating in a liquid on operating the device, by providing a connection member which opens in a cylindrical body of which one end is submerged into a liquid held in a tank body, at one end thereof and opens to the upper space above the water level, at the other end, and an opening/closing valve structure discharging the liquid and connecting the cylindrical body and the correction member. SOLUTION: An opening/closing structure is provided with a diaphragm valve body 7 installed at the bottom of a cylindrical body 16, a valve seat 17 installed at one end of the lower part of the connection member 9, and a diaphragm membrane 71 vertically actuated in accordance with the pressure variation and a seal 72 fitted thereto. When the liquid L is discharged by a constant volume and the pressure balance is temporarily broken, the diaphragm valve body 7 is moved downward and the valve structure is brought to the 'open' state and the air in the cylindrical body 16 flows again into the connection member 9 and the pressing pressure of the liquid level L0 increases and a new balanced state is formed to keep the pressure balance in accordance with the constant volume discharge of the liquid L. In this way, air bubbles are prevented from generating in the liquid in the actual operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging a fixed amount of liquid, and more particularly to a device for constantly discharging a fixed amount of liquid even when the liquid surface level fluctuates. The present invention relates to an apparatus for discharging a fixed amount of liquid without performing.

[0002]

2. Description of the Related Art As a conventional simple liquid discharging apparatus, for example, a liquid is discharged from a nozzle at the bottom of a tank while applying a gas pressure to an upper space in a tank storing the liquid to pressurize the liquid surface. Devices for causing this are known. However, in such an apparatus, when the liquid in the tank is gradually discharged and consumed, the liquid level falls, and the water head (head) changes, so that the discharge amount from the nozzle gradually changes (decreases). There was a problem of doing.

In order to solve such a problem, the inventor of the present application has already proposed a method and an apparatus which can always obtain a constant liquid discharge amount even if the liquid level changes (see Japanese Patent Application No. Hei 10-260, 1993). 8-12312). An example of the proposed device is shown in FIG. 4, which comprises a sealable liquid holding container 101 provided with a liquid ejection nozzle 113 and a liquid holding container 101 which is guided from outside to inside. A gas ejection pipe 106 whose outlet opens into the liquid L in the container;
Pressurized gas supply means 109 for supplying a constant gas to the gas ejection pipe 106 is provided. In the figure, reference numeral 102 indicates a lid, and reference numerals 104 and 105
Indicates an open / close valve.

[0004]

However, in this apparatus, as the liquid held in the container 101 is consumed as shown in FIG. 4, bubbles come out from the gas ejection pipe 106, and the liquid holding container There is a drawback that the microbubbles rise toward the liquid surface of 101 and minute bubbles diffuse into the liquid.

The present invention has been devised in view of such a situation. The purpose of the present invention is not only to obtain a constant discharge amount even if the liquid level fluctuates, but also to realize the actual discharge amount. An object of the present invention is to provide a liquid fixed-quantity discharge device that does not generate bubbles in the liquid during operation.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a sealable tank body for storing a liquid to be discharged in a fixed amount, and a nozzle for discharging the liquid in the tank body in a fixed amount. Part, a cylindrical body one end of which is immersed in the liquid stored in the tank body, a communication member having one end opened in the cylindrical body, and the other end opened to the upper surface of the liquid surface of the tank body, An opening / closing valve mechanism is provided to enable communication between the cylinder and the communication member while discharging the liquid from the tank body.

In a preferred embodiment, the on-off valve mechanism comprises:
It is configured to have a diaphragm valve body installed near the bottom of the cylindrical body, and a valve seat installed at one end of a lower part of the communication member.

In a preferred embodiment, the on-off valve mechanism comprises:
It is configured to have a float valve body installed near the bottom of the cylindrical body and a valve seat installed at one end of a lower part of the communication member.

In a preferred embodiment, the cylinder is connected to a pressurized gas supply means, and the interior of the cylinder is configured to maintain a constant pressure.

In a preferred embodiment, the other end of the cylindrical body is open to the atmosphere, and the inside of the cylindrical body is configured to be able to maintain the atmospheric pressure.

[0011]

Embodiments of the present invention will be described below in detail.

FIG. 1 shows a first embodiment of a fixed-quantity liquid discharging apparatus according to the present invention. As shown in FIG. 1, the liquid constant-rate discharge device 1 includes a sealable tank body 11 for storing a liquid L to be discharged in a constant amount.
A nozzle portion 12 for discharging a constant amount of the liquid L from the tank body is formed at the bottom of the nozzle. The nozzle unit 12 is provided with an open / close valve (not shown), and the liquid L in the tank body 11 can be discharged at a constant rate by opening the open / close valve as appropriate.

On the upper part of the tank body 11, a lid 14 is hermetically attached. Further, from the upper part of the tank main body 11, a pipe-shaped cylindrical body 16 is mounted through a lid 14, and at least one end 16 a of the cylindrical body 16 located at a lower portion of the inside of the liquid L stored in the tank main body 11. It is fixed so that it is immersed in. The other end (upper part) of the cylindrical body 16 is connected to the pressurized gas supply means 18 via a piping line 51 so that the inside of the cylindrical body 16 can be maintained at a constant pressure. In addition, the code | symbol 5 shown in the piping line 51 shows an on-off valve. Further, as shown in FIG. 1, for example, a pipe-shaped communication member 9 is mounted in the cylinder 16, and one end 9 a located below the communication member 9 has an opening inside the cylinder 16. Shape. On the other hand, the other end 9b located above the communication member 9 is open to the space S above the liquid surface of the tank body 11 in a state protruding from the side surface of the cylindrical body 16. When the communication member 9 is protruded, a portion where the cylindrical body 16 and the communication member 9 intersect is air-tightly joined. Also,
An exhaust pipe 41 is formed so as to communicate with the space S above the liquid surface of the tank body 11 through the lid 14 (reference numeral 4).
Indicates an on-off valve).

Further, as shown in FIG. 1, near the bottom of the cylinder 16 and the communication member 9, the cylinder 16 and the communication member 9 communicate with the fixed amount discharge of the liquid L stored in the tank body 11. An open / close valve mechanism is provided. The opening / closing valve mechanism as a preferred example shown in FIG. 1 includes a diaphragm valve body 7 installed near the bottom of the cylindrical body 16 and a valve seat 17 installed at one end of a lower part of the communication member 9. The diaphragm valve element 7 includes a diaphragm film portion 71 that operates up and down in response to pressure fluctuations and a seal portion 72 attached to the diaphragm film portion 71. Tip 72 of part 72
a comes into contact with or separates from the valve seat 17 to function as an on-off valve.

Next, the liquid dispensing apparatus 1 described above.
The operation and action of will be described. First, the lid 14 of the tank body 11 is opened, and a predetermined amount of the liquid L is injected into the tank body 11. Thereafter, the lid 14 is hermetically attached, and the on-off valve 4 is closed. Next, the on-off valve 5 is opened, and compressed air P is introduced into the cylinder 16. Then, the compressed air P pushes down the diaphragm valve body 7 to bring the opening / closing valve mechanism into the “open” state, and the compressed air P passes through the communication member 9 and enters the upper space S of the tank body 11. Here, the liquid level L
If the pressure at 0 is Pt, the density of the liquid is ρ, the liquid height from the on-off valve mechanism to the liquid level L0 is h, and the pressure balance at the position of the on-off valve mechanism is considered, the diaphragm valve is located where Pt + ρh = P. The body 7 is seated on the valve seat 17, and the opening / closing valve mechanism is in a "closed" state. Here, the liquid L
When the above-mentioned pressure balance is temporarily lost, the diaphragm valve 7 moves downward, the opening / closing valve mechanism is opened, and the air in the cylinder 16 flows into the communication member 9 again. The liquid enters the space S above the liquid surface. Then
Since the pressure for pressing the liquid level L0 in the tank body 11 increases, a new equilibrium state of Pt '+ ρh' = P is established,
The diaphragm valve element 7 returns to the original position, and the opening / closing valve mechanism is in the “closed” state. That is, the value of the liquid height h gradually decreases with the constant discharge of the liquid L, but the decrease in the water head pressure is maintained as a pressure increase of Pt to maintain the pressure balance. Such a constant discharge operation is performed when the level of the liquid level L0 is higher than the opening / closing valve mechanism.
Always done reliably.

In particular, when discharging a liquid having a low viscosity, it is not necessary to supply the compressed air P into the cylinder as described above, and the other end above the cylinder 16 is opened to the atmosphere. The inside of the cylinder 16 may be maintained at the atmospheric pressure.

Next, the second embodiment of the liquid dispensing apparatus according to the present invention will be described.
The embodiment will be described with reference to FIG. 2 is basically different from that shown in FIG. 1 in that the opening and closing of the liquid discharger 2 in the tank body 11 and the communication between the cylinder 16 and the communication member 9 are enabled. It is a structure of a valve mechanism. That is, the on-off valve mechanism shown in FIG.
And a valve seat 1 installed at one end 9a at a lower portion of the communication member 9.
7. The float valve element 8 includes a float base 81 that floats up and down with pressure fluctuations and the float base 8.
1 is provided with a seal portion 82 attached to
The tip portion 82a of the seal portion 82 comes into contact with or separates from the valve seat 17 with a change in pressure due to the constant-volume discharge of the liquid, thereby fulfilling the function as an on-off valve.

Next, the third embodiment of the liquid dispensing apparatus according to the present invention will be described.
The embodiment will be described with reference to FIG. The liquid quantitative discharge device 3 shown in FIG. 3 is basically different from that shown in FIG. 2 in the structure for supplying the compressed air P to the cylinder 16. That is, the compressed air P shown in FIG. 3 is supplied from the side surface (the piping line 51) of the tank body 11, passes through the ring-shaped air chamber 26 formed by the substantially ring-shaped partition member 60, and further passes through the cylindrical body 16. It is supplied to the inside of the cylindrical body 16 through the hole 36 formed in the lower side surface. In addition,
The upper part of the cylinder 16 is closed and fixed by the lid 14.

In each of the above embodiments, the pressurized condition has been described using the compressed air P. However, the present invention is not limited to the air, but may be any type of compressed gas including an inert gas such as nitrogen. Can be used. Further, the liquid to be treated by the apparatus of the present invention is not limited to a liquid at room temperature, and has a broad concept including a state in which a metal having a low melting point represented by solder or the like (molten metal) is molten. is there. When a molten metal is used as the target liquid, a heating means such as a heater may be further provided outside the apparatus shown in FIGS.

[0020]

According to the present invention, there is provided an apparatus for dispensing a fixed amount of liquid according to the present invention, which includes a sealable tank body for storing a liquid to be dispensed in a fixed amount, a nozzle for discharging a constant amount of liquid from the tank body, A cylindrical body having one end immersed in the liquid, a communication member having one end opened in the cylindrical body, and the other end opened in a space above the liquid surface of the tank body, and the discharge of the liquid from the tank body. Since it is configured to have an on-off valve mechanism that enables communication between the cylinder and the communication member,
Even if the liquid level fluctuates, not only is it possible to always obtain a constant discharge amount, but also there is an effect that bubbles are not generated in the liquid during actual operation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment of a liquid fixed-quantity discharge device according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the liquid fixed-quantity discharge device according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the liquid fixed-quantity discharge device according to the present invention.

FIG. 4 is a cross-sectional view showing a metering device that has already been proposed.

[Explanation of symbols]

 1, 2, 3, liquid constant discharge device 7: diaphragm valve element (part of opening / closing valve mechanism) 8: float valve element (part of opening / closing valve mechanism) 9 ... communication member 11 ... tank body 12 ... nozzle part 16 ... Cylindrical body 17 ... Valve seat (part of opening / closing valve mechanism)

Claims (5)

[Claims] 1. A sealable tank body for storing a liquid to be discharged in a fixed amount, a nozzle portion for discharging the liquid in the tank body in a fixed amount, and a cylinder having one end immersed in the liquid stored in the tank body. A communication member having one end opened in the cylindrical body and the other end opened in a space above the liquid surface of the tank body, and the cylinder and the communication member can be communicated with the discharge of the liquid in the tank body. A fixed-quantity discharge device for a liquid, comprising: 2. The fixed quantity according to claim 1, wherein the on-off valve mechanism has a diaphragm valve body installed near a bottom of the cylinder and a valve seat installed at one end of a lower part of the communication member. Discharge device. 3. The fixed quantity according to claim 1, wherein the on-off valve mechanism has a float valve body installed near the bottom of the cylinder and a valve seat installed at one end of a lower portion of the communication member. Discharge device. 4. The cylinder according to claim 1, wherein the cylinder is connected to pressurized gas supply means, and the inside of the cylinder can be maintained at a constant pressure. Dispensing device. 5. The fixed amount according to claim 1, wherein the other end of the cylindrical body is open to the atmosphere, and the inside of the cylindrical body can be maintained at atmospheric pressure. Discharge device.