JPS61160584A - Discharge pump - Google Patents

Abstract

PURPOSE:To make such a measuring pump as being excellent in accuracy securable, by setting up a stopper, regulating a stroke, in a driven piston, while moving a driving piston, forming an operating chamber in space with the driven piston, a distance longer than a stroke of the driven piston. CONSTITUTION:At a cylinder inside a pump block 1, there are provided with a driven piston 14 and a driving piston 13 so as to be opposed each other. An inner part of the driven piston 14 is formed into hollowness in which a stopper 22, regulating a stroke of the driven piston, is set up. In addition, a coil spring 18 is installed in the back of the driven piston, and in time of a suction stroke, it works to make the driven piston follow the driving piston. A fluid flowing in from a suction port 3 is held in between both pistons, but even if the driven piston stops after moving the specified stroke, the driving piston continues to move yet more and makes capacity in an operating chamber decrease, so that the said fluid is made to flow outward from a discharge port 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a discharge pump for discharging a predetermined amount of a predetermined liquid, and particularly to one using a hollow pump block and a plunger.

(Background technology and its problems) Various types of discharge pumps have been known in the past, but among these, the positive load pump is one that uses a plunger.This positive load pump is driven by an air cylinder. The liquid to be discharged moves forward and backward beyond the suction port during the needle plunge, and there is a check pulp provided on the discharge port side, and the liquid to be discharged is pushed into the check pulp side by the needle volume plunger, and checked by this pushing pressure. The pulp is released and a certain amount of the liquid to be discharged is discharged.

However, since such a structure has a check valve, the movement of the check valve is uncertain and the accuracy of the needle amount is poor, which becomes especially serious when the amount of liquid to be discharged decreases. There is. For this reason, a structure has been proposed in which check valves are provided in two stages in series to improve accuracy, but there is a problem that sufficient accuracy cannot always be obtained in this case.

In addition, when trying to adjust the discharge amount in such a positive load pump, since this amount cannot be adjusted on the check valve side, it is done by changing the drive amount during the metering plunge. Another drawback is that the drive mechanism is complicated in order to change the amount of drive of the metering plunger.

[Purpose of the invention]

The purpose of the present invention is to have a simple configuration and good metrology.
Furthermore, it is an object of the present invention to provide a discharge pump to which it is easy to add a structure for adjusting the discharge amount.

[Means and effects for solving the problems] The present invention has the following features:
This pump was created by focusing on the compressibility of liquid, and the first and second plunges are inserted into a hollow pump block that has a suction port and a discharge port layered at a predetermined distance. While the second plunger located on the side is always urged toward the suction port side by the biasing means and its position is regulated by the stopper, on the other hand, the first plunger located on the suction port side is driven by the driving means. The driving means moves the first plunger in a direction farther away from the second plunger while the second plunger is urged by the urging means and stopped by the stopper. The first and second plungers are driven to communicate with the suction port, and are pressed directly or through the liquid to be discharged against the liquid to be discharged through the suction boat to cause the first and second plungers to flow. The plunger of the jlli2 is configured to be driven to a position where it communicates with the discharge port, thereby achieving the above object.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1 and 2 showing the overall structure, a pump block 1 constituting the main body of the pump includes a suction port block 4 supported by a support stand 2 and having a suction port 3; A connecting block 5 connected to the left in FIG. 1, an intermediate block 6 connected to the right of the suction port block 4, and a discharge port 7 connected to the intermediate block 6. It is composed of a discharge port block 9 that grows a nozzle 8 that is screwed in so as to communicate with the discharge port block 7, and a connection block IO that is connected to this discharge port block 9, and a hole that communicates with the axis of each of these members. is formed, thereby making the pump block 1 hollow. In addition, each connecting part of each member constituting the pump block 1 has an O ring 1! A seal ring 12 is interposed to prevent liquid from leaking from the connection gap. Further, the suction port 3 and the discharge port 7 are communicated with each other through the hollow portion of the pump block 1.

A first plunger 13 and a second plunger 14 are inserted into the hollow of the pump block 1 so as to be slidable in the axial direction on the same axis and with their end faces facing each other. At this time, the first plunger 13 is inserted into the suction port 3 side, and the second plunger 14 is inserted into the discharge port 7 side.

An end block 16 is connected to the close reading block 10 via a bay block 15, and a compression coil spring as a biasing means is connected between the end block 16 and a spring receiver 17 attached to the second plunge middle 14. 18 is interposed, and the second plunge member 14 is always urged toward the suction port 3 side by the urging force of this compression coil spring IB.

Further, a hole 19 of a predetermined depth is formed in the axis of the second plunge medium 14, and the tip of a bolt 2G serving as a stopper position adjusting means is positioned within this hole 19.
The other end of this pole 20 penetrates the end block 16 and protrudes to the outside, and is fixed in a predetermined position by a so-called double nut action by screwing with the end block 16 and screwing with the butterfly nut 21. ing. At the inner end of this bolt 20 there is a stopper 22 made of two NANDs.
is fixed, and this stopper 22 is allowed to come into contact with a stop ring 23 attached to the entrance portion of the hole 19 of the second plunger 14, and the second plunger 14 is fixed by the biasing force of the compression coil spring IB. The movement of the air to the suction port 3 side can be restricted. At this time, by loosening the wing nut 21 and adjusting the position of the bolt 20, the contact position between the stopper 22 and the retaining ring 23 changes, and the stopping position of the second plunger 14 can be adjusted. There is.

A cylinder 30 serving as a driving means for the first plunger 13 is connected to the connecting block 5 located at the left end of the pump block 1 in FIG.

This cylinder 30 includes a part of the connecting block 5, a cylindrical housing 31 whose one end is connected to the connecting block 5, and a head plate that closes the other end of the housing 31 and has a discharge side air inlet/outlet 32. 33, and a piston 36 which is fixed to the left end of the first plunge medium 13 and has an O ring 34# and a seal ring 35 in the center thereof, and is formed in the connecting block 5. The first plunger 13 moves to the left in the figure as compressed air is introduced from the third floor, while the first plunger 13 moves to the left in the figure as compressed air is introduced from the discharge side air inlet/outlet 32 of the head plate 33. 13 is moved to the right. At this time, an oil injection hole 3B is formed in the connecting block 5, and lubricating oil is injected from this oil injection hole 38, and debris and the like due to the sliding of the first plunger 13 are removed from this oil injection hole 3 days later. It is designed to be able to be discharged. Further, each member connected sequentially in the horizontal direction in FIG. 1, from the head plate 33 to the end block 16, is connected at four locations by through bolts 40 shown in FIG.

A container 45 is connected and fixed to the suction port block 4, and an outlet 46 of the container 45 is connected to the suction boat 3.
The liquid to be discharged 47 in the container 45 can be supplied into the pump block l via this outlet 46 and the suction port 3. Further, a lid 48 is attached to the container 45 to prevent foreign matter from entering the container 45.

Note that reference numeral 25 in FIG. 1 is an air vent hole provided in the cylinder block 15.

Next, the operation of this embodiment will be explained with reference to FIGS. 3(A) to 3(D).

When no compressed air is applied to cylinder 3G,
As shown in FIG. 3(A), the second plunger 14
is biased to the left by the compression coil spring 18, its movement to the left is restricted by the stopper 22 and the retaining ring 23, and the first plunger 13 is pressed by the end face of the second plunger 14. in a state. At this time, as described above, the stopping position of the second plunger 14 can be adjusted by loosening the wing nut 21 and moving the bolt 20 forward or backward.

Next, as shown in FIG. 3(B), when compressed air is supplied from the suction side air inlet/outlet 37 of the cylinder 30, the first plunger 13 is moved to the left in the figure, and this movement causes the second plunger 13 to move to the left in the figure. The end faces of the plunger 14 and the first plunger 13 are separated and the inside of the pump block l becomes negative pressure.
When the end face of the plunger 13 comes to the position of the suction port 3 and the space between the first and second plungers 13 and 14 communicates with the suction boat 3, the negative pressure and the head pressure of the liquid 47 to be discharged in the container 45 are combined. As a result, the liquid 47 to be discharged flows into this space.

After this, as shown in FIG. 3(C), the supply of compressed air is switched, and the
When compressed air is supplied from 2, the first plunger 13 is moved to the right, and when the suction boat 3 is closed at the end face of the first plunger 13 during this rightward movement, this first plunger 13 is moved to the right.
Since the amount of the liquid 47 to be discharged injected between the plunger 13 and the second plunger 14 is the needle amount, and the liquid 47 to be discharged is a liquid and compressible, the first plunger 13 With this movement, the second plunger 14 is moved to the right against the compression coil spring 18.

As the first plunger 13 continues to move to the right in this way, the 11th
The dimensions of each part are designed so that the space between the second plungers 13 and 14 communicates with the discharge port 7, and in this state, the right end of the second plunger 14 comes into contact with the end block 16. The second plunger 14 is stopped at that position, while the first plunger 13 moves further to the right, so the liquid 47 to be discharged between the first and second plungers 13 and 14 is discharged from the discharge port 7. It will be done.

When the discharge of the liquid to be discharged 47 is completed, the discharge side air inlet/outlet 3
Since the supply of compressed air from 2 is cut off, the first and second plungers 13 and 14 are moved to the left by the force of the compression coil spring 18, returning to the state shown in FIG. 3(A), It will be ready for the next discharge.

By repeating the above operations, the liquid 47 to be discharged can be sequentially discharged in fixed amounts.

According to this embodiment as described above, the pump block! Since the discharge pump is constituted by the pair of plungers 13 and 14 inserted therein, the pump itself can be easily constructed and provided at low cost. Also, during this first and second plunge, 13
．． 14, only the first plunger 13 is driven by the driving means, so its driving mechanism is simple, and the second plunger 14 is not directly driven. Bolt '20 on the 14 side
By adjusting the position, the discharge amount can be easily adjusted, and the structure is simple. Furthermore, since the amount adjustment is performed by the plunger on the driven side, that is, the second plunger 14, it is possible to easily create a so-called multiple discharge pump in which a large number of the illustrated pump blocks 1 are arranged in parallel. Even if the first plunger 13 side is driven by one drive source, the discharge amount can be adjusted for each pump block 1, and compared to a conventional discharge pump configured to adjust on the drive side, separate drives are possible. Since it does not require a power source, it can be significantly miniaturized. In addition, since the liquid 47 to be discharged is measured and discharged by moving only in the axial direction, sealing can be performed more easily and completely than in conventional pumps that utilize rotation, and the accuracy of metering can be improved. can be improved. Furthermore, since it does not use a check valve that would cause unstable operation, the accuracy of weighing can also be improved from this point of view.

FIG. 4 shows another example of the structure of the pump block 1 used in the discharge pump according to the present invention. It is available.

Here, the same reference numerals are used for the same or equivalent components as in the above embodiment to simplify the explanation.

is omitted.

The suction port block 4 having the suction port 3 is made of tetrafluoroethylene (trade name: Teflon), and
Connection block 5 connected to this suction port block 4
is made of stainless steel, and this suction port block 4
A sealing member 62 made of Teflon is interposed between the connecting block 5 and the connecting block 5 through O-rings 61 at two locations. The inner periphery of this seal member 62 has a diameter smaller than other parts.
A contact surface 63 is formed in the plunger to prevent leakage of the liquid to be discharged and to reduce sliding resistance of the plunger. Furthermore, a lip portion 6 is provided on the end side of the connecting block 5.
A seal 65 for growing 4 is inserted, and this seal 65 is made of silicone rubber or the like. Further, an oil injection hole 38 is formed in the connection block 5, and an oil cup 66 can be attached to the upper part of the seal ring 35 as required.

An intermediate block 6 connected to the right side of the suction port block 4 is made of glass, and a seal member 6 is also provided between the suction port block 4 and the intermediate block 6.
A sealing member 68 made of Teflon is interposed through the hole 8, and this sealing member 68 also has a small diameter plunger abutment 1ii.
69 is formed. Further, a discharge port block 9 made of Teflon and having a discharge port 7 and a connection block 1G made of stainless steel are connected to the intermediate block 6, and there is a connection between the intermediate block 6 and the discharge port block 9 and the discharge port block 9. Teflon seal members 72 and 73 are interposed between the connection block IO and the respective O-rings 70 and 71, and these seal members 72 and
．． Plunger contact surfaces 74 and 75 are also formed on the inner periphery of the plunger 73. Furthermore, a seal 77 made of silicone rubber having a lip portion 76 is interposed in the connection block 10, and an oil injection hole 78 is formed.
An oil camp 79 can be attached as needed.

The connection block 5, suction boat block 4, intermediate block 6, discharge boat block 9 and connection block 10
are connected with a through bolt 40.

According to the embodiment shown in FIG. 4, each part is made of materials with low chemical reactivity, so it is suitable for physical and chemical equipment that uses highly chemically reactive liquids such as instant adhesives. Can be used as a discharge pump.

FIGS. 5 and 6 show different examples of the dosing valve function of the discharge pump of the present invention, that is, the structure that generates negative pressure in the nozzle 8 after completion of discharge and improves the drainage of the liquid to be discharged from the nozzle 8. It is shown.

That is, in the embodiment shown in FIG. 5, a cushion 81 made of silicone rubber or the like is embedded in the end of the second plunger 14, that is, the part that comes into contact with the first plunger 13. The force is relatively large, and when the first plunger 13 is further pressed toward the second plunger 14 from the state shown in FIG. 3(D) and the liquid to be discharged 47 is completely discharged, the cushion 81 is fully compressed within the second plunger 14 and the first
The middle plunger 13 and the second plunger 4 are made to come into direct contact with each other to complete discharge, and after that, when the biasing force of the driving means of the first plunger 13 is removed, the elastic force of the cushion 81 As shown in the figure, the first plunger 13 is moved away from the end face of the second plunger 14, and the negative pressure generated during this movement produces a dosing effect.

In addition, in the embodiment shown in FIG. 6, a cushion 82 made of a compression coil spring is interposed on the end face of the connecting block 5 in FIG. 1, that is, on the piston 36 side. When the first plunger 13 is moved to the right by the cylinder 30, the cylinder 82 is deformed and complete discharge is performed, and then the first plunger 13 is slightly moved to the left by the elastic force of the cushion B2. , which acts as a dosing pulp.

As shown in FIGS. 5 and 6, if the function of the dosing valve is provided, the liquid can be effectively drained from the nozzle 8, and the liquid 47 to be discharged will solidify near the discharge port of the nozzle 8. This can be prevented.

In addition, in each of the above embodiments, the pump block l is composed of a plurality of members, but it may be machined from a single member, and its shape etc. are not limited to those of the above embodiments. The cylinder 30 as a driving means is not limited to an air cylinder, and a cam is used to drive the first plunger 1.
The present invention is not limited to the above-mentioned embodiments and the above-mentioned variations, but can achieve the object of the present invention. Modifications of each part within the range that are possible are included in the present invention.

C Effects of the Invention As described above, the present invention has the effect of providing a discharge pump with a simple structure and high discharge accuracy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a right side view thereof, FIGS. 3(A) to D) are explanatory diagrams of the operation of the embodiment, and FIG. 5 and 6 are schematic configuration diagrams showing different examples of structures for achieving the functions of the dosing pulp used in the present invention. 1...Pump block, 3...Suction boat, 7...
・Discharge port, 13...during the first plunge, 14...
- Second plunger, 18... Compression coil spring as biasing means, 20... Bolt as strike spring adjusting means. 22...Stopper, 30...Cylinder, 45...
container. 47...Liquid to be discharged. Agent Patent Attorney Minoru Kinoshita Figure 3 Figure 4 Tomo Figure 5 Figure 6

Claims (1)

[Claims] (1) A hollow pump block, a suction port and a discharge port that communicate with each other within the pump block and are provided at a predetermined distance apart, and are capable of sliding in the axial direction on the same axis within the pump book. a first plunger on the suction port side and a second plunger on the discharge port side, which are inserted into the inlet and whose end surfaces face each other, and a biasing means that always biases the second plunger toward the first plunger; The driving means includes a stopper that restricts the sliding movement of the second plunger by the urging means, and a driving means that slides the first plunger in the axial direction. While the device is biased and stopped by the stopper, the first plunger is driven in a direction away from the second plunger, and the first and second plungers are communicated with the suction port, and the liquid to be discharged is discharged through the suction port. The first plunger is pressed from a position where it can inhale, directly or through the liquid to be discharged against the biasing means, to a position where the first and second plungers communicate with the discharge port. A discharge pump configured to drive.