JP2000265943A - Liquid discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid discharging device capable of discharging liquid at high precision, smoothly discharging even liquid easily solidifying, easily replaceable when parts are worn, and easy for maintainance and handling. SOLUTION: A disc-shaped seal disc 30 having communication holes 31, 32 communicated with suction and discharge ports 21, 22 is locked in relation to a port block 20 by a pin. The seal disc 30 is arranged by separating its outer peripheral surface from the body inner surface by taking a first flat surface 33A to be brought into contact with the port block 20 and a second flat surface 33B facing the first flat surface 33A as wrapping surfaces. Since the seal disc 30 is spaced from the body and is not pinched between the body and the port block 20, it is not deformed and tilted when applied with uneven force, and therefore, liquid leakage is not easily generated, and errors of the discharging amount can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid discharging apparatus for sucking and discharging a liquid by utilizing reciprocating motion of a plunger.

[0002]

2. Description of the Related Art Various types of liquid ejecting apparatuses (dispensers) of this type have been conventionally known. For example, there is one described in Japanese Patent Application Laid-Open No. 6-129345. The liquid discharge device includes a valve block having a sliding contact surface with a communicating hole communicating with a suction port and a discharge port, and a body having a sliding contact surface at one end contacting the sliding contact surface of the valve block. While being rotatably supported by
A pump block having a plurality of plunger insertion holes drilled in the axial direction in a state where the pump block can communicate with the opening of the communication hole of the valve block, and rotationally driven while urging the pump block toward the valve block. In this case, the plunger insertion holes are sequentially communicated with the communication holes, and the plungers in the plunger insertion holes are each driven in the axial direction to sequentially repeat the suction and discharge of the liquid.

In the liquid discharge apparatus, the valve block is fitted into a recess formed in accordance with the valve block on the body side, and the port block having the suction port and the discharge port is screwed to the body. so,
The valve block was sandwiched and fixed between the body and the port block.

[0004]

However, such a fixing structure has the following problems. That is, the valve block that is screwed between the body and the port block is deformed due to an uneven force applied when the screw is tightened, or is attached with a slight inclination, which causes a liquid leakage. There is a problem that the error of the ejection amount becomes large.

Also, since the outer peripheral surface of the valve block has a seal structure in contact with the concave portion of the body, when liquid leaks from the sliding contact surface between the valve block and the pump block, the liquid leaks from the valve block and the body. However, there is a problem that the contact surface portion remains. In particular, when a liquid that solidifies over time, such as an adhesive, is discharged, the remaining liquid solidifies on the spot, hinders the operation of the pump block and the like, and there is a problem that the pump block does not operate smoothly. Was.

Further, since the outer peripheral surface of the valve block is in contact with the concave portion of the body, it is difficult to remove the valve block from the body. In particular, when a liquid containing various fillers is discharged, the valve block and the pump block are worn by the filler, so that it is necessary to replace the valve block and the like at regular intervals, but there has been a problem that the replacement operation is difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to discharge a liquid with high precision, to smoothly discharge a liquid which is easy to solidify, and to easily replace even when parts are worn out, so that maintenance and handling are easy. It is an object of the present invention to provide a liquid ejecting apparatus.

[0008]

According to the present invention, there is provided a liquid ejecting apparatus comprising: a body; a port block attached to the body and having a suction port and a discharge port formed therein; A first plane which is prevented from rotating with respect to the block and which is in contact with the port block, and a second plane which is opposed to the first plane are wrapping surfaces, respectively, and penetrate between the first plane and the second plane. A communication hole communicating with the suction port and the discharge port of the port block is opened, and a seal disk whose outer peripheral surface is spaced apart from the inner surface of the body by a predetermined distance, and a wrapping surface is formed on a second plane of the seal disk. The sliding contact surface at one end is rotatably supported by the body in a state where the sliding contact surface is in contact with the sliding contact surface. A plunger disk having a plunger insertion hole bored in the axial direction in a state in which the plunger disk can pass therethrough, biasing means for biasing the plunger disk toward the seal disk, and rotation driving means for rotating and driving the plunger disk. A plunger inserted in the plunger insertion hole of the plunger disk so as to be slidable in the axial direction, the plunger is driven in the axial direction, and the plunger insertion hole of the plunger disk is communicated with the suction port through the communication hole. Driving means for driving the plunger in the suction direction in a retracted state, and driving the plunger in the discharge direction with the plunger insertion hole connected to the discharge port through the communication hole. It is characterized by having been done.

In the present invention, the seal disk which is in sliding contact with the plunger disk is attached to the port block only with a detent, and is arranged away from the inner peripheral surface of the body, that is, is sandwiched between the body and the port block. Since the seal disk is not deformed or tilted due to non-uniform force applied to the seal disk, liquid leakage hardly occurs and errors in the discharge amount can be reduced.

Further, since a space is formed between the outer peripheral surface of the seal disk and the inner peripheral surface of the body, even if the liquid leaks from the sliding contact surface (lapping surface) between the seal disk and the plunger disk, the leakage is prevented. Liquid does not stay on the seal disk. For this reason, even when discharging a liquid that solidifies over time, such as an adhesive, the leaked liquid does not stay in one place and solidify,
The operation of the plunger disk can be prevented from being hindered, and the plunger disk can be operated smoothly.

Furthermore, since the outer peripheral surface of the seal disk is not in contact with the concave portion of the body, the seal disk can be easily removed, for example, by removing the port block from the body. Therefore, even when the seal disk is worn out due to the discharge of the liquid containing the filler, the seal disk can be easily replaced, maintenance work and the like can be easily performed, and the device can be easily handled.

In this case, it is preferable that a drain port communicating with the space between the outer peripheral surface of the seal disk and the inner peripheral surface of the body is formed in the body. If the drain port is formed, liquid leaking from the sliding contact surface between the seal disk and the plunger disk can be discharged to the outside from the drain port, and can be prevented from accumulating in the body. Further, water or a solvent is supplied from the drain port, and the leaked liquid can be washed and discharged together with the solvent and the like, so that maintenance work can be easily performed.

The number of plunger insertion holes formed in the plunger disk may be one, but it is preferable to provide two or more plunger insertion holes. In particular, a plurality of plunger insertion holes and plungers of the plunger disk are provided, and when at least one plunger insertion hole is communicated with one opening of the seal disk, at least one other plunger insertion hole is formed. It is preferable that the plunger is configured to communicate with another opening of the seal disk, and the plunger advance / retreat driving means is configured to be able to independently drive each plunger.

According to this structure, the plunger insertion holes communicate with the communication holes on the suction port side and the communication ports on the discharge port side so that the liquid can be sucked and discharged simultaneously, thereby shortening the discharge cycle. it can. Further, by devising the shape of the opening of each communication hole, for example, when one plunger insertion hole starts to deviate from the opening communicated with the suction port and the discharge port, the next plunger insertion hole is located at the opening. In this manner, if at least one plunger insertion hole is always located in the communication port on the suction port side or the discharge port side, continuous suction and continuous discharge of the liquid can be performed, and continuous operation without pulsation can be achieved. Liquid ejection can also be performed.

Here, it is preferable that a relief groove is formed in the second plane of the seal disk from the portion located on the outer peripheral side of the opening of the communication hole to the outer peripheral surface of the seal disk. With this configuration, when the liquid leaks from the opening of the seal disk to the outer peripheral side, the liquid can be collected and discharged to the escape groove. For this reason, the leaked liquid hardly flows on the lapping surface between the seal disk and the port block, and when the liquid containing the filler leaks, the wrapping surface can be prevented from being worn by the liquid, and the wear can be prevented. The frequency of replacement of the sheet disk or the plunger disk by the above can be reduced.

Further, it is preferable that the seal disk is formed of engineering plastic and the plunger disk is formed of ceramic. If the seal disk is made of engineering plastic and the plunger disk is made of ceramic whose surface is harder than that of the seal disk, the seal disk side can be generally worn when the liquid containing the filler is discharged. As a result, only the seal disk, which has a simpler and cheaper shape than the plunger disk, needs to be replaced, and the cost of replacement parts can be reduced.
In addition, replacement work can be easily performed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the liquid ejection device 1 includes a body 10, and the body 10 includes a main cylinder 11.
And a cap 1 bolted to one end of the main cylinder 11.
2 and a connecting cylinder 14 bolted to the other end of the main cylinder 11 via a cam 13.

A viewing hole 12B is formed in the cap 12, and a cylindrical cover member 90 made of a transparent resin or the like is fitted on the inner peripheral surface thereof. Further, the cap 12 is also provided with a drain port 19 used for discharging leaked liquid and cleaning the inside of the pump.

As shown in FIGS. 2 and 3, a substantially disk-shaped port block 20 is attached to the cap 12. Note that this port block 20 is, for example, as shown in FIG.
As shown in FIGS. 6 to 6, the cap 12 and the set screw holes 12A, 20A of the port block 20 are inserted into the bolts embedded in the main cylinder 11, and wing nuts or the like are screwed into the bolt ends. 11 is fixed.

The port block 20 has a suction port 21 and a discharge port 22 formed with female threads. A container containing a liquid to be discharged, a nozzle for discharging, and the like are appropriately screwed into these ports 21 and 22.

As shown in FIG. 7, a disc-shaped seal disk 30 formed of engineering plastic, ceramic, or the like is provided in the cap 12 as a detent pin 23.
The port block 20 is disposed so as to be prevented from rotating.

As shown in FIG. 3, communication holes 31 and 32 communicating with the suction port 21 and the discharge port 22 of the port block 20 are formed in the seal disk 30.
These communication holes 31 and 32 are opened in a first plane 33A on the port block 20 side of the seal disk 30 and a second plane 33B opposed to the first plane 33A.

Each of the first plane 33A and the second plane 33
B has a smooth lapping surface which has been wrapped. The openings on the second plane 33B side of the communication holes 31 and 32 are arc-shaped grooves 34 and 35, respectively, as shown in FIGS. This groove 3
A hole 36 for removing dust or the like passing through the center of the second plane 33B is formed between the holes 4 and 35.

The diameter of the seal disk 30 is smaller than the diameter of the inner peripheral surface of the cap 12 (cover material 90), and a predetermined distance is provided between the outer peripheral surface of the seal disk 30 and the cap 12. The space 91 is configured to be formed. Further, two holes 37 into which the detent pins 23 are inserted are also formed in the first plane 33A.

In the cap 12, a cylindrical plunger disk 40 is rotatably disposed adjacent to the seal disk 30. This plunger disc 40
Is formed of a hard material whose surface is harder than that of the seal disc 30 such as alumina ceramic, and has a smooth sliding contact surface 41 at one end thereof in sliding contact with the second flat surface 33B of the seal disc 30.
have. The sliding surface 41 is also a lapping surface.

The plunger disk 40 has a plurality of, for example, three plunger insertion holes 42 penetrating the plunger disk 40.

The opening of each plunger insertion hole 42 on the sliding contact surface 41 side is formed with two grooves 34 and 35 of the seal disk 30.
The plunger insertion hole 42 and the grooves 34 and 35 are formed at positions that can face each other.
When the plunger 45 inserted into the plunger 45 is performing a suction or discharge operation, that is, when the plunger 45 is sliding in the axial direction, the plunger 45 is communicated with one of the grooves 34 and 35,
On the other hand, when the plunger insertion hole 42 is separated from the grooves 34 and 35, the size and the position are such that the suction or discharge operation is not performed.

The plunger 45 is precisely fitted into the plunger insertion hole 42, that is, the gap between the plunger 45 and the plunger insertion hole 42 is extremely small, for example, about 2 microns.

In the cap 12, a spring guide block 50 is arranged adjacent to the plunger disk 40. The main cylinder 1 of the spring guide block 50 and the body 10
A disc spring 51 is interposed between the rotating body 61 and the rotating body 61 disposed therein.

The plunger disk 40 and the spring guide block 50 are connected to the block 50 by connecting three connecting pins 43 projecting from the contact surface of the plunger disk 40 with the block 50 at regular intervals of 120 degrees. By being inserted into a hole 52 formed to face the pin 43, it can be integrally rotated.

Plunger 45 of spring guide block 50
A substantially conical convex seal 71 is inserted into the spring guide hole 53 in which is disposed. The spring guide hole 53
Has a bottom portion 53A in which only a hole into which the plunger 45 can be inserted is formed on the plunger disk 40 side, and the convex seal 71 is arranged in contact with the bottom portion 53A.

In the spring guide hole 53, a substantially cylindrical spring receiver 54, through which the plunger 45 penetrates so as to advance and retreat, is disposed adjacent to the convex seal 71. A pressing spring 56 as an urging member formed of a compression coil spring is interposed between the spring receiver 54 and a spring receiver 55 fitted to the right end side of the plunger 45 in the drawing. Press spring 56
Presses the convex seal 71 against the bottom 53A of the spring guide hole 53 with a predetermined pressure, while urging the plunger 45 in the protruding direction, that is, in the direction away from the plunger disk 40.

Therefore, the pressing spring 56 and the disc spring 5
1 urges the plunger disk 40 toward the seal disk 30 via the spring guide block 50, and the second flat surface 33B of the seal disk 30 and the sliding contact surface 41 of the plunger disk 40 slide with a predetermined pressure. It comes into contact. The pressing spring 56 and the disc spring 51 constitute an urging means. In the case where it is not necessary to increase the urging force so much as in the case of a low-viscosity liquid or the like, the sealing disc 30 and the plunger disc 40 are slid by the urging force of only the pressing spring 56 without providing the disc spring 51. Is also good. The tip of the spring receiver 54 on the convex seal 71 side is
The convex seal 71 has a conical concave shape so that it can be in close contact with the conical surface of the convex seal 71.

A stopper ring 58 is fitted to the plunger 45, and when the plunger 45 is detached from the spring guide block 50, the spring receiver 54 is locked by the stopper ring 58 so as not to come off.

A ring-shaped seal 16 is interposed between the outer peripheral surface of the spring guide block 50 and the inner peripheral surface of the cap 12 of the body 10. Each of these seals 1
6, 71 can prevent the liquid from leaking to the drive unit side.

The seals 16, 71 and the like are formed of a suitable material such as synthetic resin or rubber. Particularly, the seals which are in direct contact with the liquid have chemical resistance and the like, and are hardly deformed, so that the liquid can be measured. It is preferable to be formed of a tetrafluoroethylene copolymer (trade name: Teflon) or the like in which an error hardly occurs.
Further, the plunger 45, the spring receivers 54 and 55, the pressing spring 56, and the retaining ring 58 are made of stainless steel. The plunger 45, the spring receivers 54, 55, the pressing spring 56, the retaining ring 58, and the convex seal 71 constitute a plunger assembly.

At one end of the spring guide block 50, that is, at the right end in FIG.
3 is rotatably disposed in bearing 3 via bearings 17 and 18. Three connecting pins 62 project from the end face of the rotating body 61 on the guide block 50 side at equal intervals of 120 degrees, and these connecting pins 62 are provided in connecting holes 57 opened in the end face of the block 50. And the rotation of the rotating body 61 is transmitted to the block 50.

The right end of the rotating body 61 in the figure is fixed to an output shaft 66 of a motor 65 via a coupling 67 composed of an Oldham coupling or the like. Here, the motor 65, the coupling 67, the rotating body 61, the spring guide block 50, and the connecting pins 43 and 62 constitute a rotation driving unit 60 of the plunger disk 40, and the rotation of the motor 65 smoothly moves to the plunger disk 40. To be transmitted.

Inside the rotating body 61, there are three rods 81, which are arranged at equal positions at 120 degrees opposite to the three plungers 45 inserted into the plunger insertion holes 42 of the plunger disk 40, and are bearings. It is inserted slidably in the axial direction via 82. In the middle of this rod 81,
In the concave portion 61B formed in the middle of the rotating body 61,
The follower holder 83 is pinned.

A cam follower 84 comprising two rollers is rotatably mounted on the shaft 83B of each follower holder 83. Each of these cam followers 84 is guided in an axial follower guide hole 61C formed at an equal position at 120 degrees on the peripheral surface of the rotating body 61 so as to be movable in the axial direction and not movable in the rotational direction.

The cam follower 84 is connected to the cam 13.
Is pressed against the cam surface 13A formed on the end surface of the cam member 13 by the pressing force of the pressing spring 56, and advances and retreats in the axial direction along the shape of the cam surface 13A with the rotation of the rotating body 61. Rod 81 via holder 83
Here, the rod 81, the follower holder 83, the cam follower 84, and the cam surface 13A of the cam 13 are transmitted to the plunger 45.
Constitutes the plunger advance / retreat driving means 80.

The main cylinder 11 has a spring guide block 5
A temporary fixing pin 93 projecting to the 0 side is embedded.
The plurality of temporary fixing pins 93 are provided, for example, so as to protrude at two or three places on the inner peripheral surface of the main cylinder 11, and when the port block 20 and the cap 12 are removed from the main cylinder 11, a spring guide is provided. The spring guide block 5 is provided so that the block 50 does not protrude from the main cylinder 11 by the urging force of the disc spring 51.
It is provided so as to be engaged with each of the 0 flange portions 50A. The flange 50A of the spring guide block 50 includes
Notches 50B are formed in accordance with the number and positions of the pins 93, and the spring guide blocks 50 can be removed from the main cylinder 11 by aligning the notches 50B with the positions of the temporary fixing pins 93. .

Next, the operation of the present embodiment will be described. Before operating the liquid ejection apparatus 1 of the present embodiment, a tank of a liquid to be transferred is connected to the suction port 21 via a tube or the like, and a transfer destination container is connected to the discharge port 22 also via a tube or the like. I do. Also, a liquid recovery tank is connected to the drain port 19 via a tube or the like.

When the motor 65 of the rotary driving means 60 is driven in such a state, the rotation of the output shaft 66 is rotated through the rotary driving means 60 including the coupling 67, the rotating body 61, the spring guide block 50 and the like. Disk 40
To rotate the plunger disk 40 in sliding contact with the seal disk 30.

With this rotation, the rod 81 interposed in the rotating body 61 rotates together with the rotating body 61, so that the cam follower 84 supported by the rod 81 via the follower holder 83 operates the pressing spring 56. By the cam surface 13
The cam surface 13A advances and retreats along the axial displacement of the cam surface 13A while contacting the cam surface 13A. At this time, since the cam follower 84 is guided by the follower guide hole 61C of the rotating body 61 so as to move only in the axial direction, the rod 81 smoothly advances and retreats along the axial displacement of the cam surface 13A.

The advance and retreat of the rod 81 is transmitted to the plunger 45 via the spring receiver 55 and the like, and the plunger 45 advances and retreats in the plunger insertion hole 42 of the plunger disk 40 in the axial direction. The reciprocation of the plunger 45 depends on the cam surface 1
By setting the shape of 3A to an appropriate shape, the plunger 45 is moved in a direction away from the suction port 21 side, that is, to the right in FIG. Due to the rightward movement of the plunger 45, a negative pressure is generated in a space formed on the left end side of the plunger insertion hole 42, and the liquid to be transferred through the suction port 21, the communication hole 31, and the groove 34 due to the negative pressure. Is inhaled.

At the point where the movement of the plunger 45 to the right is completed, the plunger insertion hole 42 is displaced from the position of the groove 34 communicating with the suction port 21, and is located on the groove 35 side of the communication hole 32 of the discharge port 22. You will move toward it. During this movement, the cam surface 13A has a flat shape with no axial displacement, so that the plunger 45 does not advance or retreat in the axial direction and moves toward the groove 35 while maintaining the same position. Moving.

When the plunger insertion hole 42 comes to a position communicating with the groove 35 on the discharge port 22 side, the cam follower 8 of the plunger advance / retreat driving means 80 is operated by the action of the cam surface 13A.
The plunger 45 is moved to the left in the drawing, and the plunger 45 is also moved to the left via the rod 81 and the like with the movement of the cam follower 84, and the sucked liquid is moved into the plunger insertion hole 42 at the left end face of the plunger 45. Extruded from the through hole 3
2 and discharge into the discharge port 22.

The discharge operation of the liquid by the plunger 45 is performed while the plunger insertion hole 42 communicates with the arc-shaped groove 35.
When the plunger insertion hole 42 comes out of the groove 35, the movement of the plunger 45 in the axial direction is stopped. This stopped state of the plunger 45 is maintained until the plunger insertion hole 42 comes to the position of the groove 34 on the suction port 21 side again by the action of the cam surface 13A.

As described above, when the plunger insertion hole 42 comes to the groove 34 side of the suction port 21 again, the cam surface 1
By the action of 3A, the plunger 45 is moved to the right again, and moves to a suction operation of sucking the liquid from the suction port 21, and the same operation is repeated thereafter to rotate the plunger disc 40 of one plunger insertion hole 42. With each accompanying rotation, the liquid suction and discharge operations are performed one cycle at a time.

The suction and discharge operations accompanying the advance and retreat of the plunger 45 are performed in each of the plunger insertion holes 42 in the same manner.
As can be seen from FIG.
During the suction or discharge operation.
Since the two fluids can be communicated with the groove 35 at the same time, the liquid sucked into each plunger insertion hole 42 or discharged from the plunger insertion hole 42 is continuously sucked or discharged to maintain a constant flow rate. It has become.
In addition, by appropriately setting the shape of the cam surface 13A, the total flow rate of the liquid sucked or discharged into each plunger insertion hole 42 is always constant, so that the suction and suction without pulsation can be achieved. Discharge can be performed.

In the operation of the liquid ejecting apparatus 1, the plunger disk 40 is urged toward the seal disk 30 via the spring guide block 50 by the disc spring 51 and the pressing spring 56 as urging means. Plane 33
B and the sliding surface 41 are in contact with a predetermined contact pressure.
Since each of the second flat surfaces 33B and the sliding contact surface 41 is a lapping surface, by contacting with a predetermined contact pressure,
The seal between the surfaces 33B and 41 is made sufficient and necessary.

More specifically, each surface 33B, 41
Although a minute leak occurs from between, the lubrication is performed by the minute liquid, and the respective surfaces 33B and 41 are smoothly slid. Also, the leaked fine liquid is
With the rotation of the plunger disk 40, it flows to the outer peripheral surface side of the seal disk 30 and the plunger disk 40, is discharged from the space 91 via the drain port 19, and does not stay at one place. If it is difficult to cause a small leak on the sliding contact surface between the seal disk 30 and the plunger disk 40, for example, when discharging a liquid that is easily solidified or a high-viscosity liquid, the suction port 21 may be used as necessary. By transferring the liquid to be supplied to the suction port 21 while pressurizing the supplied liquid, a minute leak required for lubrication may be positively generated.

Further, the lapping surface may be formed so that such a small leak is generated and lubrication is performed. The material of the seal disk 30, the plunger disk 40, the type of the liquid to be discharged, the viscosity, etc. Surface roughness and the like may be appropriately set according to the conditions. For example, when the seal disk 30 is made of plastic or when a liquid containing filler is discharged, the surfaces 33B and 41 may be normal lapping surfaces, but both the seal disk 30 and the plunger disk 40 are made of ceramic. In the case where no leakage occurs with the normal lapping surface as in the case of discharging a low-viscosity liquid, the surface roughness of at least one of the surfaces 33B, 41 is set to 0.2 to 0.1. What is necessary is just to adjust to about 4S and set so that a minute leak may occur.

In particular, in the case of sucking / discharging a liquid which is likely to be solidified, by flowing water or a solvent from one drain port 19 to the other drain port 19, the solidification of the liquid in the seal portion is more effective. Is prevented.

When a liquid containing a filler such as a silver paste is discharged, the filler may enter between the respective surfaces 33B and 41, and the seal disk 30 and the plunger disk 40 may be worn.

For example, when discharging a liquid containing a filler that is softer than the seal disk 30 and the plunger disk 40, the surface of the seal disk 30 and the plunger disk 40 that is softer is often worn. On the other hand, when discharging a liquid containing a filler that is harder than the seal disk 30 and the plunger disk 40, the filler may bite into the relatively soft seal disk 30, and the plunger disk 40 may be scraped and worn.

When the seal disk 30 and the plunger disk 40 wear out and the error in the discharge amount increases, the port block 20 is removed from the cap 12. As a result, the seal disk 30, which is only prevented from rotating by the rotation preventing pin 23 with respect to the port block 20, can be removed and replaced very easily because the outer periphery may not be in contact with the cap 12. Further, the plunger disc 40 is also provided with the seal disc 30.
Can be removed continuously so that it can be easily replaced.

According to the present embodiment, the following effects can be obtained. (1) The seal disk 30 slidingly in contact with the plunger disk 40 is attached only to the port block 20 with a detent, and is disposed away from the inner peripheral surface of the body 10 (cap 12). When bolted to the body 10, the seal disk 30 is not deformed or tilted due to uneven force applied to the seal disk 30,
Liquid leakage due to such deformation can be prevented, and errors in the ejection amount can be reduced.

(2) Since the space 91 is formed between the outer peripheral surface of the seal disk 30 and the inner peripheral surface of the body 10,
Even if the liquid leaks from the sliding contact surfaces 33B and 41 between the seal disk 30 and the plunger disk 40, the liquid does not stay on the seal disk 30. For this reason,
Even in the case of discharging a liquid that solidifies with the passage of time, such as an adhesive, the leaked liquid does not stay in one place and is hardened, thereby preventing the rotation operation of the plunger disk 40 from being hindered. , Plunger disc 40
Can move smoothly.

(3) In addition, each surface 33B, 41 is a lapping surface, and a slight leakage occurs. However, since the minute liquid lubricates, each surface 33B, 41
Can slide smoothly.

(4) Since the outer peripheral surface of the seal disk 30 is not in contact with the inner peripheral surface of the body 10, the seal disk 30 can be easily removed by removing the port block 20 from the body 10. Therefore, the worn seal disk 30 and the like can be easily replaced, maintenance work and the like can be easily performed, and the handling can be easily performed.

(5) In addition, the seal disk 30 is formed of engineering plastic or the like, has a disk-like shape, has a relatively simple structure, and can have a small wall thickness. it can. Therefore, even if the worn seal disk 30 needs to be replaced, it can be replaced at low cost.

(6) Further, since the seal disk 30 is made of plastic and the plunger disk 40 is made of ceramic, when discharging a normal filler-containing liquid, the side of the seal disk 30 that is softer than the plunger disk 40 should be used. Can be worn. This allows
Generally, only the seal disk 30 which has a simpler and cheaper shape than the plunger disk 40 needs to be replaced, and the frequency of replacement of the plunger disk 40 can be reduced, so that maintenance costs including replacement parts are also inexpensive. Can be held down. For example, the seal disk 30
Is molded using an engineering plastic of grade name "TI-5013" (surface hardness, Rockwell E-72, M-109) of Toray Industries, Inc., and the plunger disc 40 is made of alumina ceramic of Kyocera Corporation. "A-
479 "(Vickers hardness, 1,650), the seal disk 30 is often worn out, and only the seal disk 30 which is cheaper than the plunger disk 40 needs to be replaced. Can be suppressed.

(7) Since the drain port 19 is formed in the body 10 (cap 12), the sliding contact surface 33B between the seal disk 30 and the plunger disk 40,
The liquid leaked from 41 or the like can be discharged from the drain port 19 to the outside, and can be prevented from accumulating in the space 91 in the body 10. Further, water or a solvent can be supplied from the drain port 19 and the leaked liquid can be washed and discharged together with the solvent and the like, so that maintenance work can be easily performed and solidification of the liquid can be reliably prevented. The operation of the plunger disk 40, the plunger 45, and the like can always be smoothly performed.

(8) Since three plunger insertion holes 42 are provided, each plunger insertion hole 42 communicates with the communication hole 31 on the suction port 21 side and the communication hole 32 on the discharge port 22 side to suck and discharge liquid. Can be performed simultaneously, so that the discharge cycle can be shortened.

(9) Further, arc-shaped grooves 34, 35 are formed in the openings of the communication holes 31, 32, and when one plunger insertion hole 42 starts to come off from each of the grooves 34, 35, the next plunger is inserted. Since the holes 42 are located in the grooves 34, 35, at least one plunger insertion hole 42 can always be located in the grooves 34, 35 connected to the communication holes 31, 32. Thus, continuous suction and continuous discharge of liquid can be performed, and continuous liquid discharge without pulsation can be performed.

(10) Since the sliding surfaces 33B and 41 between the seal disk 30 and the plunger disk 40 are wrapping surfaces, respectively, the rotation resistance can be made relatively small while ensuring the necessary and sufficient sealing performance. Can be downsized, and rotation control can be performed easily and accurately.

(11) The plunger insertion hole 42 of the plunger disk 40 and the plunger 45 are assembled by precision fitting, so that the liquid sucked into the plunger insertion hole 42 does not leak to the spring guide block 50 side. , Can be sealed sufficiently. Even if the liquid leaks from between the plunger insertion hole 42 and the plunger 45, most of the liquid leaks from the contact surface between the plunger disk 40 and the spring guide block 50.
Through the drain port 19.
In addition, since the bottom 53A is provided in the spring guide hole 53 of the spring guide block 50 and the convex seal 71 is arranged so as to contact the bottom (plane) 53A, the contact surface between the convex seal 71 and the spring guide hole 53 is formed. The sealing can be surely performed, and even if liquid leaks from between the convex seal 71 and the plunger 45, the spring receiver 54 is pressed against the pressing spring 5
Since the sealing can be performed by urging in step 6 to make contact with the convex seal 71, it is possible to reliably prevent the liquid from leaking to the drive section side.

(12) The parts that come into contact with the liquid are the sealing disk 30 made of engineering plastic, the plunger disk 40 made of alumina ceramic, the port block 20 made of Teflon or the like having excellent chemical resistance, and the cap 12 or the like. Therefore, the liquid ejecting apparatus 1 having excellent chemical resistance can be obtained, and various liquids can be ejected.

(13) The plunger 45 is formed separately from the rod 81, and the seal disk 30 and the plunger disk 40 are connected to the port block 2 by the connecting pin 43.
0 and the spring guide block 50, if the port block 20 is removed from the cap 12, the seal disk 30 and the plunger disk 40, which are in contact with the liquid and may be worn depending on the discharge liquid,
Can be easily taken out. Thereby, the seal disk 30 and the plunger disk 40 are exchanged, and each of the suction and discharge ports 21, 22 and the like, that is, the sliding contact surfaces 33B,
It is possible to easily check the state of the plunger 41, the state of the plunger insertion hole 42, etc., and clean and maintain these parts.

(14) When the seal disk 30 and the plunger disk 40 are removed, the spring guide block 50 is locked by the temporary fixing pins 93, and the plunger 45, the spring receivers 54 and 55, the convex seal 71 and the like are removed. Since the plunger assembly is also locked by the bottom 53A of the spring guide hole 53, it can be held on the liquid ejection device 1 side.
Therefore, only the seal disk 30 and the plunger disk 40 can be easily removed, and other parts do not come off at the same time, so that removal work and assembly work at the time of maintenance and replacement can be easily performed. ,
Workability can be improved.

(15) Further, if the cap 12 is removed and the notch 50B of the flange 50A of the spring guide block 50 is aligned with the position of the temporary fixing pin 93, the plunger assembly such as the spring guide block 50 and the plunger 45 can be easily formed. They can be removed, and cleaning, maintenance and the like can be easily performed.

(16) The plunger 45 is moved forward and backward by the rod 81
The movement of the plunger 45 can be accurately controlled by appropriately setting the shape of the cam surface 13A because the shape is uniquely determined by the shape of the cam surface 13A of the cam 13 via.
Also in this respect, accurate discharge without pulsation can be performed.

(17) Since the liquid discharge device 1 discharges the liquid in an amount proportional to the rotation amount of the output shaft 66 of the motor 65, if the controller for controlling the motor 65 is provided, it is possible to accurately and easily discharge the liquid. Can be controlled.

(18) The cap 12 is formed with a peephole 12B, and a cylindrical cover member 90 made of a transparent resin or the like is fitted on the inner peripheral surface thereof.
During the operation, the internal state, in particular, the state of the sliding contact surface portion of the seal disk 30 and the plunger disk 40 can be visually confirmed. For this reason, it can be easily grasped that the leakage of the liquid has increased due to the wear of the seal disk 30 and the like, and it is also possible to determine whether or not the maintenance work is performed, so that the liquid ejecting apparatus 1 can always be operated in a good state.

The present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved. For example, the seal disk 30 is not limited to engineering plastic, and may be made of alumina ceramic similarly to the plunger disk 40. Furthermore, the seal disk 3
The plunger disk 40 is not limited to the one made of alumina ceramic, but may be made of another material such as ceramic of another material such as silicon nitride.

The structure of the seal disk 30 is not limited to that of the above-described embodiment, but may have a relief groove 100 on the second plane 33B as shown in FIG. In other words, on the second flat surface 33B of the seal disk 30, a circumferential groove 101 is provided on the outer peripheral side of the arc-shaped grooves 34 and 35, that is, at a position away from the grooves 34 and 35, and the outer periphery of the seal disk 30 is Grooves 1 formed in four directions toward the surface
02 is formed. A plane portion other than the clearance groove 100 of the second plane 33B of the seal disk 30 is a lapping surface. The sliding surface 41 of the plunger disk 40 has the same diameter as the second flat surface 33B of the seal disk 30 and is a lapping surface.

With such a structure, the same operation and effect as those of the above-described embodiment can be obtained. In addition, when a liquid which contains a very hard filler or the like and the seal disk 30 or the like is likely to be worn is discharged. Then, the liquid flows into each groove 3
Even when the liquid leaks from the holes 4 and 35, the liquid can flow to the outer peripheral surface side through the escape groove 100, and the leaked liquid is on the lapping surface 103 between the circumferential groove 101 and the outer periphery of the seal disk 30. It can be prevented from flowing. For this reason, since the wrapping surface 103 does not involve the leakage liquid and is not worn by the filler, the smooth wrapping surface can be maintained, and the load applied from the plunger disk 40 by the disc spring 51 or the like can be surely reduced. It can also be supported.

The number of plungers 45 is not limited to three, but may be one, two, or four or more. In short, it is only necessary to be able to suck and discharge the transfer liquid. Further, the plunger advance / retreat driving means 80 is not limited to the configuration of the above-described embodiment, and may be a means for driving the end face of the plunger 45 by directly contacting the cam face 13A of the cam 13;
By a cylinder and a servomotor provided in a part which rotates integrally with the plunger disk 40, directly or in a rack,
A drive shaft or the like driven via a pinion or the like may be provided to move the plunger 45 forward or backward, or a suitable actuator may be provided at a portion that does not rotate integrally with the plunger disk 40, etc. Can be used.

Further, the rotation driving means 60 of the plunger disk 40 is not limited to the structure of the above-described embodiment, and for example, a gear or the like is mounted on the outer periphery of the plunger disk 40, and the gear is driven by a motor to directly rotate the plunger disk 40. You may. In addition, the suction port 21 and the discharge port 22 provided in the port block 20 are named as described above for convenience. If the rotation direction of the plunger disc 40 is reversed, the suction port 21 side becomes the discharge port, and the discharge port The port 22 side is a suction port, and is not limited by its name.

The disc spring 51 as the urging means may be another type of spring. However, the disc spring 51 has an advantage that a large urging force can be obtained in a small space. Further, as the motor 65, various motors such as a stepping motor, a servo motor, a synchronous motor, a DC motor, an induction motor, a reversible motor, and an air motor can be used. Further, the shape, structure, and the like of the other parts are not limited to the above embodiment, and various modifications are possible.

The liquid ejecting apparatus 1 of the present invention is used not only for a constant flow at a constant flow rate for a predetermined time but also for discharging a liquid in a predetermined pattern by appropriately controlling a motor 65, for example. It can be used when a small amount of liquid is discharged into the line according to the flow rate measurement value or the like of the line in which the liquid is flowing and mixed, or when sampling from the line.

Further, the motor 65 is operated by interposing the liquid discharging device 1 in the line in which the predetermined liquid is flowing so that the pressure and the like of the lines before and after the pump are in an equilibrium state. The flow rate may be measured from the amount, the number of pulses, or the like. In particular, since the liquid discharge device 1 of the present invention is suitable for sucking / discharging a very small amount of liquid, it can also be used as a very small amount flow meter.

[0085]

According to the present invention as described above, it is possible to discharge a liquid with high accuracy, to smoothly discharge a liquid which is easy to solidify, and to easily replace even when parts are worn. This makes it possible to provide a liquid ejection device that is easy to maintain and handle.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of the embodiment.

FIG. 3 is an enlarged sectional view of a main part of the embodiment.

FIG. 4 is a side view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along the line VV of FIG. 2;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 2;

FIG. 7 is a schematic perspective view showing a seal disk and a plunger disk of the present embodiment.

FIG. 8 is a schematic perspective view showing a seal disk according to a modification of the present invention.

DESCRIPTION OF SYMBOLS 1 Liquid ejection device 10 Body 11 Main cylinder 12 Cap 13 Cam 14 Connection cylinder 16 Seal 19 Drain port 20 Port block 21 Suction port 22 Discharge port 23 Detent pin 30 Seal disk 31, 32 Communication hole 33A First Plane 33B Second plane 34,35 Groove 36,37 hole 40 Plunger disk 41 Sliding surface 42 Plunger insertion hole 45 Plunger 50 Spring guide block 50A Flange 50B Notch 51 Belleville spring as urging means 53 Guide hole 54,55 Spring Receiving 56 Pressing spring as urging member 60 Rotating driving means 61 Rotating body 65 Motor 67 Coupling 71 Convex seal 80 Plunger advance / retreat driving means 81 Rod 84 Cam follower 90 Cover material 91 Space 93 Temporary fixing pin 100 Escape groove 10 , 102 groove 103 lapping surface

Claims (5)

[Claims] 1. A body, a port block attached to the body and having a suction port and a discharge port formed therein, and a disk-shaped, non-rotatable with respect to the port block, and the port block A first plane in contact with the first plane and a second plane opposite to the first plane are wrapping surfaces, and penetrate between the first plane and the second plane to communicate with the suction port and the discharge port of the port block. A sealing disk having a communicating hole opened and an outer peripheral surface thereof being separated from the inner surface of the body by a predetermined distance, and a sliding contact surface at one end serving as a lapping surface abutting a second plane of the sealing disk. And is rotatably supported by the body, and is bored in the axial direction in a state where it can communicate with the opening of the communication hole of the seal disk. A plunger disk having a plunger insertion hole, an urging means for urging the plunger disk toward the seal disk, a rotation driving means for rotating the plunger disk, and an axial slide in the plunger insertion hole of the plunger disk. The plunger freely inserted and the plunger are driven in the axial direction, respectively.
The plunger is driven in the suction direction while the plunger insertion hole of the plunger disc is communicated with the suction port through the communication hole, and the plunger insertion hole is communicated with the discharge port through the communication hole. And a plunger advance / retreat drive means for driving the plunger in the ejection direction. 2. The liquid ejection device according to claim 1, wherein the body has a drain port communicating with a space between an outer peripheral surface of the seal disk and an inner peripheral surface of the body. Liquid ejecting device. 3. The liquid ejecting apparatus according to claim 1, wherein a plurality of plunger insertion holes and plungers of the plunger disk are provided, and at least one plunger insertion hole is formed in one opening of the seal disk. And at least one other plunger insertion hole is configured to communicate with another opening of the seal disk, and the plunger advance / retreat driving means is capable of independently driving each plunger. A liquid ejecting apparatus characterized in that: 4. The liquid ejecting apparatus according to claim 1, wherein a portion of the second plane of the seal disk from an outer peripheral side of an opening of the communication hole to an outer peripheral surface of the seal disk. A liquid discharge device, wherein a continuous relief groove is formed. 5. The liquid ejecting apparatus according to claim 1, wherein the seal disc is formed of engineering plastic, and the plunger disc is formed of ceramic.