JPH07189891A - Pump - Google Patents

Abstract

PURPOSE:To provide a pump which can eliminate seal material, deliver a highly viscous liquid, and deliver the liquid accurately even if its quantity is extremely small. CONSTITUTION:A delivery port opening and closing valve 42 to open and close a delivery port 35, a delivery member 44 to deliver liquid, and a feed part opening and closing valve 49 to open and close a liquid feed part 46 are arranged in order concentrically in a container 30 with the delivery port 35, and driven by a drive mechanism. Also the liquid can be delivered accurately since its volume is measured, delivered even if its viscosity is high since liquid route length is short, and returns back to the container 30 even if it leaks. Thus no seal material is required because liquid does not leak to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for discharging a liquid, and can be used for a pump for discharging various liquids such as silver paste, alcohol, thermosetting epoxy resin, electrolytic solution for batteries and capacitors, and grease.

[0002]

BACKGROUND ART Conventionally, various types of liquid discharge pumps are known, but generally, a pump unit, a drive unit, a tank in which discharge liquid is stored and a liquid is transferred from the tank to the pump unit. And a transfer means such as a pipe.

[0003]

However, in the conventional pump, when the tank is separated from the pump or when a high viscosity liquid such as grease is supplied, it is necessary to use a pump for pressure feeding, As the mechanism becomes complicated,
There is a problem that maintenance of the pump for pressure feeding is complicated and costly.

Further, when the liquid is pressurized by using a pump for pressure feeding or the like, the liquid is apt to leak from the pump portion to the driving portion side due to the pressurization, so that O is provided between the respective members such as valves of the pump portion. It was necessary to seal by interposing a ring or the like. However, when the seal material is used, the discharge amount varies due to the deformation of the seal material due to the use of the pump. Therefore, especially when it is necessary to discharge a very small amount of liquid with high accuracy, the seal material is deformed. There is also a problem in that the accuracy of the discharge amount is reduced due to the fluctuation of the discharge amount due to. Further, since the seal material is consumed due to wear and the like with the use of the pump, it has to be replaced in a constant cycle, and there is a problem that maintenance work is complicated.

Further, there is a type of pump in which the pumping means such as a pipe is eliminated by directly supplying pulsed air to a container containing the liquid and discharging the liquid by the pressure, but in this type of pump, If the viscosity of the liquid in the container changes due to temperature changes, etc., the discharge amount will change even if the pressure of the air supplied to the container is constant,
In particular, when ejecting a very small amount of liquid, it is difficult to maintain highly accurate ejection.

An object of the present invention is to eliminate the sealing material even when using a pump for pressure feeding, and to discharge a highly viscous liquid without using a pump for pressure feeding. An object of the present invention is to provide a pump that can discharge a liquid with high accuracy even if the liquid is extremely small.

[0007]

A pump according to the present invention comprises a container having a discharge port for discharging a liquid, a discharge port opening / closing valve arranged in the container for opening / closing the discharge port, and arranged in the container. And a discharge member that is arranged concentrically outside the discharge port opening / closing valve and discharges the liquid, and is arranged inside the container and concentrically outside the discharge member, and communicates from the inside of the container to the discharge port. And a drive mechanism that drives the discharge port opening / closing valve, the discharge member, and the supply unit opening / closing valve by a predetermined operation.

At this time, the discharge opening / closing valve and the supply portion opening / closing valve have a convex contact surface of a spherical surface and a concave tapered surface of each of the discharge opening and the liquid supply portion. It is preferable that the discharge port and the liquid supply unit are opened and closed by being brought into contact with and separated from each other. Further, no seal material is provided between the discharge port opening / closing valve and the discharge member and between the discharge member and the supply part opening / closing valve to prevent liquid leakage, and the discharge member is not provided. Also, it is preferable that holes are formed in an intermediate portion of the supply part opening / closing valve arranged inside the container, and the insides of the discharging member and the supply part opening / closing valve are communicated with the inside of the container through these holes. .

[0009]

The operation of the present invention as described above is as follows. First, the discharge liquid is supplied into the container. This supply of liquid is performed by supplying the liquid from a tank in which the discharge liquid is stored to the container via a pipe or the like, or by making the container detachable and mounting the container containing the liquid on a pump. Next, by a drive mechanism using compressed air or the like, the supply opening / closing valve is opened so that the liquid in the container can be supplied to the inside of the supply opening / closing valve via the liquid supply portion, and further the discharging member is set. Move it away from the discharge port,
The liquid is sucked into the space formed by this movement.

After this suction operation, the supply opening / closing valve is closed and the liquid is sealed inside the supply opening / closing valve to measure the discharge liquid. After this metering operation, the discharge port opening / closing valve is opened so that the liquid can be discharged, and the discharge member is moved toward the discharge port to discharge the liquid from the discharge port. After this discharge operation, the discharge port opening / closing valve is closed to close the discharge port. By repeating the above operation, the liquid is ejected from the ejection port every predetermined amount.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a pump system using a pump 1 according to an embodiment of the present invention. The pump 1 includes a drive unit 2 and a pump unit 3 that incorporate a drive mechanism.
This pump 1 is a vertical device for lowering the pump 1 so as to approach the member to be ejected when the liquid is ejected, and raising the pump 1 so as not to interfere with the conveying device or the like except when the liquid is ejected. It is held at 4. The drive unit 2 of the pump 1 is supplied with air as a drive source, and
A controller 5 that controls the supply timing is connected via an air supply pipe 6.

As shown in FIG. 2, the drive unit 2 has four cylinder blocks 10, 11, 1 connected in the vertical direction.
2 and 13 are provided. Each cylinder block 10
The connection of 13 is made by connecting members (not shown) passed through the four corners of the cylinder blocks 10-13.

The cylinder blocks 10, 11 and 12 include
First, second, and third cylinders 14, 15, and 16 and first, second, and third cylinder ports 17, 18, and 19 communicating with the cylinders 14 to 16 are formed. Further, the first, second, and third cylinders 14 to 16 are slidable in the vertical direction of FIG. 2, which is the axial direction.
The respective pistons 20, 21, 22 are inserted.

Each cylinder 14 to 16 has a piston 2
First, second, and third coil springs 23, 24, 25 for urging 0, 21, 22 upward in FIG. 2 are arranged.
Then, each cylinder port 17 to
When air is supplied to 19, the pistons 20 to 22 are moved downward in FIG. 2 against the urging force of the coil springs 23 to 25, and when the air supply is stopped, the pistons 20 to 22 move to the coil springs 23. It is configured to be moved upward in FIG. In addition, each piston 20-22
Between the cylinders and the cylinders 14 to 16, an appropriate sealing material such as a U-seal is interposed so that the driving air does not leak.

Into the first piston 20, a piston rod 26 arranged in the central shaft portion of the pump 1 is press-fitted,
It is configured to move in the vertical direction together with the piston 20. The second piston 21 is composed of a piston member 21A having a large diameter portion that is in sliding contact with the cylinder 15 and a piston member 21B in which a piston rod 26 slidably penetrates the central axis. The third piston 22 is a piston member 22 having a large diameter portion that is in sliding contact with the cylinder 16.
A and a piston member 22B in which the second piston 21 is slidably provided on the center axis.

A drain port 27 for discharging the discharge liquid 7 to the outside of the pump 1 is formed in the lowermost cylinder block 13 of the drive unit 2 so as not to leak to the drive unit 2 side. .

On the other hand, as shown in FIG. 3, the pump portion 3 of the pump 1 is made of a stainless steel container 30 having a substantially cylindrical shape and a lower end portion 30A formed in a downward conical shape. , And a container mounting member 31 for mounting the container 30 on the drive unit 2. Container mounting member 31
Is bolted to the cylinder block 13 at the lower end of the drive unit 2, and a flange 31A for attachment, which is partially cut away, is formed at the lower end thereof. A locking portion 30B of the container 30 inserted from the cutout portion is locked to the flange 31A, and the locking portion 30B is pressed by a fixing ring 33 which is biased downward by a coil spring 32. That is, by using the so-called bayonet structure, the container 30 is detachably attached to the container attachment member 31.

A tapered hole 30C is formed in the lower end portion 30A of the container 30 so as to gradually narrow downward, and a valve seat 36 having a discharge port 35 is press-fitted into the hole 30C from above to form a hole 30C. It is fixed so that it does not come out downward using the tapered surface of. Discharge port 35 container 3
The opening on the 0 inner side is formed with a contact surface 35A which is a concave tapered surface whose diameter decreases downward, and a discharge needle 37 extended to the outside of the valve seat 36 is press-fitted. There is.

At the lowermost end of the container 30, the valve seat 3
A holding member for attaching 6 from the outside of the container 30, a screw 30D used when attaching a sensor for detecting liquid ejection, a cap for the ejection port 35, and the like are formed. Further, the container mounting member 31 is provided with a through hole 3 for mounting an optical liquid level gauge for detecting the liquid level in the container 30 as needed.
1B is formed.

A valve rod 40 made of stainless steel for opening and closing the discharge port 35 is arranged at the central axis portion of the container 30.
As shown in FIG. 2, the upper end of the valve rod 40 extends to the cylinder block 12 portion, and the connecting cap 4
It is in contact with the lower end of the piston rod 26 via 1. Further, as shown in FIG. 3, the contact surface 40A that contacts the discharge port 35 at the lower end of the valve rod 40 is a convex spherical surface, and should contact and separate from the tapered contact surface 35A of the discharge port 35. Is configured to open and close the discharge port 35.
Therefore, the contact surface 40A at the lower end of the valve rod 40 and the contact surface 35A of the discharge port 35 constitute the discharge port opening / closing valve 42.

A stainless discharge pipe 43 is arranged outside the concentric circle of the valve rod 40. At the lower end of the discharge pipe 43, a discharge member 44 made of stainless steel that is slidably inserted in the valve rod 40 in the axial direction is attached. In addition, the discharge pipe 43
The upper end side of the cylinder block 13 is
Is extended to the second piston 21 via the connecting member 45.

As shown in FIG. 3, a stainless valve pipe 47 for opening and closing a liquid supply portion 46 that connects the inside of the container 30 and the discharge port 35 is arranged on the outer side of the discharge pipe 43 concentrically. ing. An open / close member 48 made of stainless steel is attached to the lower end of the valve pipe 47 so as to be slidably fitted in the discharge member 44 in the axial direction. The contact surface 48A at the lower end of the opening / closing member 48 is a convex curved surface and is formed so as to be able to come into contact with and separate from the tapered contact surface 36A at the upper end of the valve seat 36, so that the liquid supply portion 46 can be opened and closed. ing. Therefore, the lower end contact surface 48 </ b> A of the opening / closing member 48 and the contact surface 36 </ b> A of the valve seat 36 form a supply portion opening / closing valve 49. Further, as shown in FIG. 2, the upper end side of the valve pipe 47 extends to the container mounting member 31, and the upper end thereof is in contact with the third piston 22 via the connecting member 50.

The connecting cap 41 and the connecting member 4
5 and between the connecting members 45 and 50, and between the connecting member 50 and the container mounting member 31, respectively.
53 is interposed, each connection cap 41, the connection member 45,
50 is biased to the piston rod 26 of the first piston 20, the second piston 21, and the third piston 22, respectively. Thereby, each connection cap 41, the connection member 45,
50, that is, the valve rod 40, the discharge pipe 43, and the valve pipe 47 are moved up and down according to the operation of the pistons 20 to 22, so that the discharge port opening / closing valve 42 and the discharge member 4 are provided.
4. It is configured to operate the supply part opening / closing valve 49.

In addition, in the middle portion of the discharge pipe 43 and the valve pipe 47 inside the container 30, the pipes 43, 4 are provided.
Grooves 43A and 47A communicating between the inside and the outside of 7 are formed, and the valve rod 40, the discharge member 44, and the opening / closing member 48 are formed.
The liquid 7 leaked upward from each of the sliding contact surfaces can be returned to the container 30 again.

As shown in FIG. 2, a micrometer 55 is attached to the cylinder block 10 of the drive unit 2, and a spindle of the micrometer 55 is provided with three rods 56 protruding from it to adjust the discharge amount. A member 57 is attached. The rod 56 penetrates the first piston 20 and is in contact with the second piston 21, and depending on this contact position, the stroke amount of the second piston 21, that is, the discharge member 44.
The amount of movement of the discharge liquid 7 in the axial direction is determined, and the discharge amount of the discharge liquid 7 is set.

Here, the controller 5, the air supply pipe 6, the cylinders 14 to 16, the cylinder port 1
7-19, pistons 20-22, coil springs 23-2
5, the piston rod 26, the valve rod 40, the discharge pipe 43, the connecting members 45 and 50, the valve pipe 47, the opening / closing member 48, and the coil springs 51 to 53, the discharge port opening / closing valve 42, the discharging member 44, and the supply unit opening / closing. A drive mechanism 58 for the valve 49 is configured.

Next, the operation of this embodiment will be described with reference to the operation explanatory diagrams of FIGS. 4 and 5. Before the start of operation, that is, when the pump 1 is stopped, as shown in FIG. 4A, the contact surface 40A at the lower end of the valve rod 40 is moved downward to contact the contact surface 35A of the discharge port 35. Therefore, the discharge port opening / closing valve 42 is in a closed state. The closing of the discharge port opening / closing valve 42 is performed by supplying compressed air into the first cylinder 14 by the controller 5. On the other hand, the discharge member 44 and the opening / closing member 48
Is at the upper stroke end position, and thus the supply opening / closing valve 49 is open. Accordingly, the inside of the opening / closing member 48 and the valve seat 36 has a container 30.
The liquid 7 is supplied from the liquid supply unit 46 through the liquid supply unit 46.

Next, when compressed air is supplied into the third cylinder 16 by the controller 5, the third piston 22 moves downward, and along with this movement, the opening / closing member 48 is opened as shown in FIG. 4 (B). Valve seat 3 moved downward
The contact portion 36 </ b> A of 6 is brought into contact with the contact portion 36 </ b> A, and the supply portion opening / closing valve 49 is closed. As a result, the liquid 7 is sealed inside the opening / closing member 48 and the valve seat 36, and the liquid 7 is measured in a predetermined amount.

After that, when the controller 5 stops the air supply to the first cylinder 17 to open the atmosphere,
The first piston 20 moves upward due to the action of the coil spring 23, and the valve rod 40 moves the discharge port 35 with the movement.
Moved further away. Therefore, as shown in FIG. 4C, the discharge port opening / closing valve 42 is opened and the discharge port 35 is opened, and the liquid 7 can be discharged from the needle 37 attached to the discharge port 35.

After that, when air is supplied to the second cylinder 15 by the controller 5, as shown in FIG. 5 (A),
The discharge member 44 is moved downward, and the measured liquid 7 is discharged from the discharge port 35 through the needle 37. Next, when the controller 5 supplies air to the first cylinder 14 and closes the outlet opening / closing valve 42, the outlet 35 is closed as shown in FIG. 5 (B).

Thereafter, when the controller 5 opens the inside of the third cylinder 16 to the atmosphere, the coil piston 25 moves the third piston 22 and the opening / closing member 48 upward as shown in FIG. 5 (C). The supply opening / closing valve 49 is opened. Next, when the controller 5 opens the second cylinder 15 to the atmosphere, the second piston 21 is moved upward by the action of the coil spring 24 as shown in FIG. The liquid 7 is moved in a direction further away and the liquid 7 flows from the container 30 into the space formed by the movement and is supplied from the container 30. 5D shows the same state as FIG. 4A, and the liquid 7 is sequentially discharged from the discharge port 35 by a predetermined amount by repeating the above operations thereafter.

Further, in this embodiment, the amount of the liquid 7 sucked into the space formed inside the opening / closing member 48 and the valve seat 36 shown in FIG. 4 (B) is changed to the discharge shown in FIG. 5 (B). The discharge amount is the amount excluding the amount of the liquid 7 remaining in the space left inside the valve seat 36 when the outlet 35 is closed, so-called dead space. Therefore, the discharge amount is adjusted by adjusting the moving amount of the discharging member 44, that is, the moving amount of the second piston 21, and the moving amount of the second piston 21 is discharged by operating the micrometer 55. It is adjusted by moving the amount adjusting member 57.

According to this embodiment as described above, the following effects can be obtained. That is, since the liquid 7 to be discharged is closed in the opening / closing member 48 and the valve seat 36 by closing the supply opening / closing valve 49 to measure the volume, the discharge amount can be accurately adjusted even if the discharge amount is very small. Can be controlled. In addition, the adjustment of the discharge amount is performed by the micrometer 55.
Therefore, since it is only necessary to adjust the movement amount of the ejection member 44, it is possible to perform easily and with high accuracy.

A container 30 is provided in the pump unit 3, and this container 3
Since the liquid 7 is put in 0, the transfer distance of the liquid 7 can be shortened, and even the highly viscous liquid 7 can be reliably supplied without providing a pressurizing means. When the discharge amount is small with respect to the volume of the container 30, such as when discharging a very small amount of the liquid 7, the discharge amount for half a day or one day can be secured by filling the container 30 with the liquid 7. Even when the container 30 is attached and detached and the liquid 7 is replenished, workability and productivity do not decrease. The replenishment timing of the liquid 7 can be easily managed by providing a liquid level gauge or setting a replenishment cycle from the discharge amount per constant time. In addition, when the container 30 is detached and the liquid 7 is replenished, a transfer means such as a pressure pump is not required, so that the structure is simplified and the pump 1 can be provided at low cost.

The valve rod 40, the discharge member 44, the opening / closing member 48, etc. are arranged in the container 30 in which the liquid 7 is placed, and the discharge pipe 43 and the valve pipe 47 communicate with the slots 43A and 47A. Has formed
Even if the liquid 7 leaks from the sliding contact surfaces of the valve rod 40, the discharge member 44, and the opening / closing member 48, the liquid 7 can be returned into the container 30 through the groove holes 43A and 47A. Therefore, the liquid 7 leaked from each of the sliding contact surfaces is not driven by the drive unit 2.
It is possible to reliably prevent the liquid from reaching the side and leak, and to prevent the liquid from leaking from the sliding contact surface.
There is no need to provide a sealing material such as a ring.

The valve rod 40, the discharge member 44, and the opening / closing member 48 are all made of stainless steel and are sealed only by slidingly contacting each other, and a sealing material such as an O-ring is not necessary. Therefore, the sealing material is deformed. It is possible to eliminate the fluctuation of the discharge amount due to the above, and it is possible to discharge the liquid 7 with a high accuracy even with an extremely small amount of the liquid 7. Further, when the seal material is provided, maintenance work such as replacement of the worn seal material at regular intervals is necessary. However, since the seal material is unnecessary in this embodiment, the maintenance work is easily performed. be able to. Further, since the sealing material is not provided, the liquid 7 leaks from the sliding contact surface of each valve rod 40, the discharge member 44, and the opening / closing member 48, but in this embodiment, the discharge amount is small and the discharge cycle is short. The amount of the liquid 7 that leaks in a very short time is very small, and the precision of the discharge amount is hardly affected, and high-precision discharge can be performed.

Even if the container 30 is provided with a means for transferring the liquid 7 from a tank for storing the liquid 7 by using a pressure pump or the like, since the liquid 7 is temporarily stored in the container 30, The pressure can be reduced to atmospheric pressure. Therefore, even if a pressure pump is used, it is not necessary to provide a seal member for preventing liquid leakage in the pump unit 3, and the structure can be simplified and highly accurate discharge can be performed.

Further, the contact surfaces 40A and 48A of the valve rod 40 and the opening / closing member 48 constituting the discharge opening / closing valve 42 and the supply portion opening / closing valve 49 are formed into convex spherical surfaces, while the discharge opening 35 and the valve are formed. Since the abutting surfaces 35A, 36A of the seat 36 are concave tapered surfaces, even if the respective members are made of stainless steel, the abutting valves 42,
The opening and closing of 49 can be ensured. For this reason, it is not necessary to configure one member of Teflon (trade name) or the like, and each member of the valves 42 and 49 is not damaged due to wear or the like when the valves 42 and 49 are opened and closed. Four
2, 49 can be operated stably and reliably for a long period of time.

The liquid 7 having a high viscosity such as paste is delayed in the discharge of the liquid 7 when the pump portion 3 and the discharge port 35 are separated from each other, but according to the present embodiment, the discharge for discharging the liquid 7 is generated. Since the pump portion 3 having the working member 44 and the like is very close to the discharge port 35, there is no delay in discharging the liquid 7.

Solvents such as alcohol, which has a low boiling point and is easily vaporized, are apt to generate bubbles when the flow becomes complicated, such as when sucking into the pump or when passing through a check valve, and the bubbles are accumulated and the liquid 7 is discharged. However, according to the present embodiment, the pump unit 3 and the discharge port 35 are extremely close to each other,
Since the liquid supply part 48 is concentrically provided in the part of the supply part opening / closing valve 49 and the suction area of the liquid 7 can be widened, the liquid 7 can smoothly flow in and the flow does not become complicated. The liquid 7 can be normally discharged without causing Further, even if bubbles occur, the bubbles have a lower specific gravity than the liquid 7 and therefore move upward in the container 30. Therefore, bubbles do not remain in the discharge port 35 provided at the lowermost end of the container 30 and the inner portion of the opening / closing member 48, and the liquid 7 that does not contain bubbles can always be discharged.

Since each member in contact with the liquid 7 of the pump portion 3 is made of stainless steel, even the corrosive liquid 7 can be handled. Further, in the above-mentioned embodiment, since the pump portion 3 and the driving portion 2 are separated, it is possible to use stainless steel having a high unit price only in the pump portion 3, and the chemical-resistant pump 1
Even it can be offered at a low price. Further, the drive unit 2 and the pump unit 3 can be easily separated by removing the bolts of the container mounting member 31, and maintenance such as cleaning only the pump unit 3 can be easily performed.
Therefore, even when the type of the discharge liquid 7 is changed, it can be easily performed.

To discharge the highly viscous liquid 7 at high speed, the liquid 7
Need to be pushed out at high pressure, but each piston 20-2
2, piston rod 26, discharge member 44, opening / closing member 4
Since 8 and the like are arranged concentrically, the pressure resistance is enhanced and the liquid 7 can be discharged at high speed. Since the drive unit 2 is a so-called air cylinder type, the pump 1 can be downsized, and is particularly suitable for discharging a small amount of the liquid 7. In addition, this drive mechanism 5
The controller 8 needs only to control the presence / absence of air supply to the cylinder ports 17 to 19 by the controller 5, so that the control is easy and can be surely operated.

The present invention is not limited to the configuration of the above-described embodiment, and modifications within the range in which the object of the present invention can be achieved are included in the present invention. For example, in the above-mentioned embodiment, the container 30 made of stainless steel was used.
As shown in FIG. 7, the container 70 may be made of Teflon (trade name) or the like. This container 70 uses a Teflon pipe 71 so that the inside can be visually recognized, and stainless steel holding plates 72, 7 are provided at both upper and lower ends of the pipe 71.
3 and a plurality of stays 74 are provided between the holding plates 72 and 73.
And the pipe 71 is configured to be constantly maintained at a constant volume without being deformed.

The upper holding plate 72 of the container 70 is detachably attached to the container attachment member 75 by the bayonet attachment structure similar to that of the above embodiment. The container mounting member 75 is bolted to the cylinder block 13 of the drive unit 2 with a bolt 76. Further, the container mounting member 75 is formed with a liquid supply hole 77 for replenishing the liquid 7 from a tank 80 that stores the liquid 7.

An optical sensor 78 for detecting the liquid level inside the Teflon pipe 71 is attached to the stay 74, and an attachment hole 79 for attaching the pump 1 to the vertical device 4 is formed. ing. And
As shown in FIG. 6, a liquid level controller 81 is connected to the liquid level sensor 78, and the controller 81 controls a replenishment pump 82 for replenishing the liquid 7 from the tank 80 in accordance with the change in the liquid level. The replenishment of liquid 7 is automated.

In this modification as well, the same effect as that of the above-described embodiment can be obtained, and since the container 70 is constructed by using the pipe 71 made of Teflon, the inside of the container 70 can be visually recognized from the outside and the liquid level sensor. 78 can also be located outside the container 70. Therefore, the operator can directly monitor the liquid surface to control the replenishment timing of the liquid 7 and the like, and since it is not necessary to put the sensor 78 in the liquid 7, the types of sensors are limited. Never. Further, by using the sensor 78 and the liquid level controller 81, there is an advantage that the liquid 7 can be automatically replenished according to the change in the liquid level in the container 70 and the pump 1 can be automatically operated. .

Further, in the above embodiment, not only the container 30 but also the pump portion 3 including the valve rod 40, the discharge pipe 43, the discharge member 44, the valve pipe 47, the opening / closing member 48 and the like.
Although the respective members constituting the above are made of stainless steel, other members such as metal such as titanium and ceramics may be used as these members. In particular, a material that is relatively hard and has chemical resistance is preferable.

In the above embodiment, the pistons 20 to 22 are moved up and down by the air and the coil springs 23 to 25, but they may be moved only by the air. Further, the discharge port opening / closing valve 42, the discharging member 44, and the supply section opening / closing valve 49 may be directly driven by a cam or a step motor driven by a motor or the like. In short, the drive mechanism 58 of the present invention
Is only required to be capable of independently driving the discharge port opening / closing valve 42, the discharging member 44, and the supply section opening / closing valve 49 and performing the above-described operation. Further, the operation timing may be set so that the discharge port opening / closing valve 42 is closed at the same time when the discharge of the liquid 7 by the discharge member 44 is completed. In this case, after the discharge of the liquid 7 by the discharge member 44, There is an advantage that the discharge of the liquid 7 by closing the discharge opening / closing valve 42, that is, the two-stage discharge of the liquid 7 can be prevented.

Further, the shapes and the like of the discharge port opening / closing valve 42, the discharging member 44, and the supply section opening / closing valve 49 are the contact surfaces 40A, 48A formed of convex spherical surfaces as in the above embodiment.
And the contact surfaces 35A and 36A made of concave taper surfaces are not limited to contact with each other, and the shape and mechanism thereof may be set appropriately for implementation. In short, according to the present invention, the discharge port opening / closing valve 42, the discharge member 44, and the supply section opening / closing valve 49 may be sequentially arranged concentrically from the inner side to the outer side, and the specific structure, material, mechanism, etc. are appropriately set. do it.

Further, in the above-described embodiment, the state shown in FIG. 4 (A) is the stopped state of the pump 1, that is, the reference state, but depending on the type of the liquid 7 to be discharged, the state shown in FIG. 4 (C). May be the stopped state of the pump 1, that is, the reference state. In this case, a negative pressure is generated by the movement of the valve rod 40, and the liquid 7 is sucked into the pump 1. Therefore, the liquid 7 does not leak from the discharge port 35, and the liquid 7 is discharged at the same time when the pump 1 is driven. There is an effect that it can be ejected. The selection of this reference state can be easily controlled by the controller 5,
The pump 1 of the present invention can be widely used for discharging various liquids 7. Further, the pistons 21 and 22 have a plurality of piston members 21A and 21A so that they can be easily processed and assembled.
Although it is composed of B, 24A, and 24B, each may be composed of one member. In short, cylinder block 1
The shapes and materials of 0 to 13 and the pistons 20 to 22 and the like are not limited to the shapes and the like of the above-mentioned embodiment, and other shapes and the like may be used.

[0051]

According to the pump of the present invention as described above, even when the pump for pressure feeding is used, the sealing material can be eliminated, and a high viscosity liquid can be obtained without using the pump for pressure feeding. There is an effect that the liquid can be ejected, and even if the liquid is extremely small, it can be ejected with high precision.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a system using a pump according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a drive unit of the pump of the embodiment.

FIG. 3 is a vertical sectional view showing a pump portion of the pump of the embodiment.

FIG. 4 is an explanatory view showing the operation of the pump section of the above-mentioned embodiment.

5 is an explanatory diagram showing a continuation of the operation of FIG. 4. FIG.

FIG. 6 is a schematic configuration diagram showing a system using a pump of a modified example of the invention.

FIG. 7 is a vertical cross-sectional view showing a pump portion of the pump of the modified example.

[Explanation of Codes] 1 Pump 2 Drive part 3 Pump part 5 Controller 7 Liquid 14 1st cylinder 15 2nd cylinder 16 3rd cylinder 20 1st piston 21 2nd piston 22 3rd piston 23 1st coil spring 24 2nd coil Spring 25 Third coil spring 30 Container 35 Discharge port 35A Abutment face 36 Valve seat 36A Abutment face 40 Valve rod 40A Abutment face 42 Discharge port opening / closing valve 43 Discharge pipe 43A Groove hole 44 Discharge member 46 Liquid supply part 47 Valve pipe 47A Groove hole 48 Opening / closing member 48A Contact surface 49 Supply part opening / closing valve 58 Drive mechanism 70 Container 71 Pipe 72 Holding plate 73 Holding plate 74 Stay

Claims (3)

[Claims] 1. A container having a discharge port for discharging a liquid,
A discharge port opening / closing valve that is arranged in the container to open and close the discharge port; a discharge member that is arranged in the container and is arranged concentrically outside the discharge port opening / closing valve to discharge the liquid; A supply part opening / closing valve, which is arranged inside and concentrically outside the discharge member and opens / closes a liquid supply part communicating with the discharge port from the inside of the container, and the discharge port opening / closing valve, the discharge member and the supply part A pump comprising: a drive mechanism that drives each of the on-off valves by a predetermined operation. 2. The pump according to claim 1, wherein the discharge port opening / closing valve and the supply section opening / closing valve are provided with a contact surface formed into a convex spherical surface and a discharge port formed in a concave tapered surface and a liquid supply section. A pump which is configured to open and close the discharge port and the liquid supply unit by coming into contact with and separating from the contact surface. 3. The pump according to claim 1, wherein
The discharge port on-off valve and the discharge member and the discharge member and the supply part on-off valve are in sliding contact with each other, and at an intermediate portion of the discharge member and the supply part on-off valve arranged in the container. A pump is characterized in that holes are formed, and the insides of the discharge member and the supply part opening / closing valve are communicated with the inside of the container through these holes.