JPH09324743A - Plunger pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plunger pump which can eliminate a seal material for preventing liquid leak and discharge a high viscous liquid, even not using a pump for forced-feeding. SOLUTION: A plunger pump is provided with a vessel 30 having a discharge port, a valve block 35 providing a slide surface 38, discharge port 41 and intake port 42, a pump block 50 supported rotatably in the vessel 30 under such state that the slide surface 51 is contacted with the slide surface 38 and having a plunger insertion hole 53 bored to a position communicated to the delivery port 41 and the intake port 42, a plunger 55 inserted to a plunger insertion hole 53 slidably, a coil spring 56 for energizing the pump block 50 to the valve block 35 side and a plunger advance/retreat drive means for advancing/ retreating the rotation drive means of the pump block 50 and the plunger 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plunger pump that sucks and discharges liquid by utilizing the reciprocating motion of a plunger.

[0002]

BACKGROUND ART Various types of pumps of this type have been conventionally known, and examples of this type of pump include those described in JP-A-6-129345 and Japanese Utility Model Laid-Open No. 2-78773. This pump has a valve block that has a sliding contact surface with communication holes that communicate with the intake port and the discharge port, and rotates with the body with one sliding contact surface contacting the sliding contact surface of the valve block. A pump block having a plunger insertion hole axially formed at a position where it can be freely supported and communicated with the opening of the communication hole of the valve block, while urging the pump block toward the valve block side. The plunger insertion hole is sequentially communicated with the communication hole by rotationally driving, and the plungers in the plunger insertion hole are each driven in the axial direction to sequentially repeat suction and discharge of the liquid.

At this time, the discharge liquid was supplied from a tank connected to the suction port via a pipe or a tube. Further, in these pumps, the plunger is axially moved in the plunger insertion hole to suck the liquid,
Since the liquid is discharged, an O-ring or the like is interposed between the plunger insertion hole and the plunger to seal the liquid so that the liquid does not leak to the drive means side that drives the plunger.

[0004]

However, in such a conventional pump, since the discharge liquid is sucked from the tank through the suction port, the tank is separated from the pump, grease, etc. When supplying a high-viscosity liquid, it is necessary to supply the liquid using a pressure-feeding pump, which complicates the mechanism, and the maintenance of the pressure-feeding pump is complicated and costly. It was

Further, when a seal member is provided on the plunger portion to prevent liquid leakage, the seal member is consumed due to wear and the like as the pump is used, and therefore must be replaced at regular intervals and maintenance work is required. There was also the problem of being complicated.

An object of the present invention is to provide a plunger pump which can eliminate a sealing material for preventing liquid leakage and can discharge a highly viscous liquid without using a pump for pressure feeding.

[0007]

A plunger pump according to the present invention has a container having a discharge port for discharging a liquid, and a sliding contact surface disposed inside the discharge port in the container and facing the inside of the container. A valve block, a discharge port that penetrates through the valve block and connects a discharge port formed in the sliding contact surface with a discharge port of the container, and a suction port formed in the sliding contact surface of the valve block. The suction port formed in the valve block so as to communicate the opening with the opening exposed inside the container of the valve block, and the container in the state where the sliding contact surface at one end is in contact with the sliding contact surface of the valve block. One or a plurality of plunger inserts that are rotatably supported inside and are bored along the axial direction at a position where they can communicate with the discharge opening and the suction opening of the valve block. A pump block having a hole; one or a plurality of plungers slidably inserted in a plunger insertion hole of the pump block; a biasing means for biasing the pump block toward the valve block; A rotary drive means for rotationally driving the pump block, and a plunger insert hole of the pump block driven by the rotary drive means to drive the plunger in the suction direction in a state in which the plunger insertion hole is in communication with the suction opening, and
Plunger advancing / retreating drive means for driving the plunger in the ejection direction when the plunger insertion hole is in communication with the ejection opening is provided.

In the present invention as described above, the liquid is supplied from the tank in which the discharged liquid is stored to the container through a pipe or the like, or the container is configured to be detachable, and the container containing the liquid is attached to the pump. To supply the discharge liquid into the container.

Next, the pump block, which is brought into contact with the valve block at a predetermined pressure by the biasing means, is rotated by the rotation driving means so that the plunger insertion hole communicates with the supply opening.
The plunger driving means moves the plunger in the suction direction, that is, in the direction away from the valve block, and sucks the liquid from inside the container into the plunger insertion hole through the suction port. At this time, since the liquid in the container is sucked through the suction port, the liquid transfer distance is shortened, and even a highly viscous liquid can be reliably supplied into the plunger insertion hole without using a pressurizing means. .

In this suction state, the pump block is rotated so that the plunger insertion hole communicates with the discharge opening, and the plunger driving means moves the plunger in the discharge direction.
That is, move in the direction close to the valve block,
The liquid sucked into the plunger insertion hole is discharged from the discharge port. At this time, since the liquid discharge amount can be controlled by the movement amount of the plunger, it can be set with high accuracy.
Thereafter, while maintaining the discharge state, the pump block is rotated to communicate the plunger insertion hole with the suction opening, and the same operation as described above is repeated, whereby suction and discharge can be sequentially repeated.

Further, since the pump block is arranged in the container, even if the liquid leaks from between the plunger insertion hole and the plunger, the liquid only returns to the inside of the container.
Therefore, it is not necessary to dispose the seal material in the plunger and the plunger insertion hole, the structure is simplified, the maintenance is simplified, and the cost is reduced.

The number of plunger insertion holes formed in the pump block may be one, or two or more may be provided. When a plurality of plunger insertion holes are provided, at least one plunger insertion hole is communicated with the discharge opening of the valve block, and at least one other plunger insertion hole is communicated with the suction opening of the valve block, and It is preferable that the advancing / retreating drive means is configured to be capable of independently advancing / retreating each plunger.

According to this structure, since each plunger insertion hole can communicate with the suction opening and the discharge opening to suck and discharge the liquid at the same time, the discharge cycle can be shortened. Further, by devising the shape of the discharge opening and the suction opening, for example, when one plunger insertion hole starts to come off from the suction opening and the discharge opening, the next plunger insertion hole is positioned at the suction opening and the discharge opening portion. If at least one plunger insertion hole is always positioned at the suction opening or the discharge opening, continuous suction and continuous discharge of liquid can be performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of a plunger pump 1 according to an embodiment of the present invention. Pump 1
Is configured to include a drive unit 2 and a pump unit 3 that incorporate a drive mechanism. The drive unit 2 of the pump 1 is provided with a connector 4 for controlling the drive unit 2 and supplying electric power, and a controller (not shown) is connected to the connector 4 to control the pump 1.

As shown in FIG. 2, the drive unit 2 has a stepping motor 11 fixed to the body 10. A toothed pulley 12 is fixed to the output shaft of the motor 11, and a bearing 13 is attached to the pulley 12 and the body 10.
A toothed belt 15 is stretched between the toothed pulleys 14 that are pivotally supported via the. The toothed belt 15
Is slackened by the tension pulley 16.

The toothed pulley 14 is composed of upper and lower members, a nut 17 having an internal thread formed on the central axis thereof is arranged on the inner peripheral side thereof, and the bearing 13 is arranged on the outer peripheral side thereof. Each member is screwed so as to sandwich the nut 17 and the bearing 13. Further, a rubber friction plate 18 is attached to the lower surface of the pulley 14.

A male screw 21 portion of the transmission rod 20 is screwed onto the nut 17. Screw 21 of transmission rod 20
A spline 22 is formed below. further,
A drive rod 60 described later is connected to the lower end of the transmission rod 20.

Below the toothed pulley 14, a cup-shaped actuator 2 fitted to the spline 22 is provided.
4 are arranged. The actuator 24 is normally urged by the coil spring 25 toward the toothed pulley 14 side, is brought into close contact with the friction plate 18 and is rotated integrally with the pulley 14 by the frictional force thereof. When the arranged solenoid 26 is actuated, the pulley 1 is pulled toward the solenoid 26 side as shown in FIG.
It is configured to be fixed apart from 4.

A rotation sensor 2 adjacent to the actuator 24 for detecting the rotational position of the actuator 24.
7 are provided. Further, an upper end detection sensor 28 for detecting an upper end position of the transmission rod 20 is provided on the upper portion of the body 10.
Is provided.

On the other hand, the pump section 3 is, as shown in FIG.
A container 3 made of stainless steel, Teflon (trade name), titanium or the like, which is formed in a substantially cylindrical shape, and the lower end portion 30A of the inner peripheral surface is formed in a conical shape whose diameter decreases downward.
0 is provided. At the top of this container 30, a cap nut 3
The upper lid 32 is attached by 1 and by attaching the upper lid 32 to the lower end portion of the body 10 with the cap nut 33,
The container 30 is connected to the drive unit 2. Also, the container 30
A liquid injection port 30B is formed on the upper part of the tank so that the liquid can be supplied from a tank or the like via a tube.

A valve block 35 is arranged at the lower end 30A of the container 30. The outer peripheral portion of the valve block 35 is sandwiched between the container 30 and a mounting flange 36 screwed to the container 30 via a Teflon (trade name) seal 37.

As shown in FIG. 5, the valve block 35 is formed in a substantially disc shape, and is formed continuously with the smooth sliding contact surface 38 facing the inside of the container 30. And a tapered surface 39 exposed inside the container 30.
Further, the valve block 35 has a discharge port 4 axially penetrating from a discharge opening 40 formed in the sliding contact surface 38.
1 and a groove-shaped suction port 42 formed from the sliding contact surface 38 to the tapered surface 39. A suction opening 43 is formed by an opening portion formed on the sliding contact surface 38 of the suction port 42.

On the lower end side of the discharge port 41 of the valve block 35, a discharge needle 46 which is a discharge port is arranged via a packing 45 made of Teflon arranged in a tapered concave portion and fixed by a mounting screw 47. ing.

Inside the container 30, a resin pump block 50, which is formed in a substantially cylindrical shape as a whole, is disposed adjacent to the valve block 35. This pump block 50
A smooth sliding contact surface 51, which is in sliding contact with the sliding contact surface 38 of the valve block 35, is formed at the lower end of the. This sliding surface 5
1 and the sliding contact surface 38 have surface roughness satisfying both sealing property and slidability. For example, one surface roughness is 0.01 to 0.15 μmRa and the other is 0.2. ~
It is 0.4 μmRa.

An engaging groove 52 is formed at the upper end of the pump block 50 so that two rotation transmitting rods 62 extending from the large diameter portion 61 of the drive rod 60 are engaged with the engaging groove 52. Thereby, when the drive rod 60 rotates, the pump block 50 rotates via the rotation transmission rod 62 and the engagement groove 52.

The pump block 50 has a single plunger insertion hole 53 penetrating the pump block 50. The plunger insertion hole 53 is formed at a position where it can communicate with the discharge opening 40 and the suction opening 43 of the valve block 35 as the pump block 50 rotates.

A plunger 55 is inserted into the plunger insertion hole 53, and a coil spring 56 as an urging means is interposed between the plunger 55 and the pump block 50. With this coil spring 56, the plunger 55
Is constantly abutted against the large diameter portion 61 of the drive rod 60, and the pump block 50 is biased toward the valve block 35 side so that the sliding contact surface 38 of the valve block 35 and the sliding contact surface 51 of the pump block 50 are predetermined. It comes in sliding contact under the pressure of.

As shown in FIG. 2, the drive rod 60 includes a coil spring 64 interposed between the upper lid 32 and a bearing 63 held by the drive rod 60.
It is biased and connected to the 0 side.

Next, the operation of this embodiment will be described with reference to FIGS.
The description will also be made with reference to. First, the liquid 7 is supplied into the container 30. The liquid 7 may be supplied by removing the container 30 and inserting the liquid 7 and then reattaching it, or may be supplied from the liquid injection port 30B via a tube or the like.

In the present embodiment, the origin is the suction completion state of FIG. 6 (A). The state where the suction is completed means that the plunger insertion hole 53 communicates with the suction opening 43 and the plunger 55
Is the upper stroke end position (the position where the upper end of the transmission rod 20 is detected by the upper end detection sensor 28 and stopped)
It has been raised to.

In this original state, when a start signal is input by pressing the start button, the stepping motor 11 is operated and the toothed pulley 14 is rotated. At this time, since the solenoid 26 is not operated, the actuator 24 is brought into close contact with the friction plate 18 of the toothed pulley 14 by the coil spring 25, and the frictional force causes the actuator 24 to rotate integrally with the toothed pulley 14.

The rotation of the actuator 24 is transmitted to the pump block 50 via the spline 22, the transmission rod 20, and the drive rod 60, and the pump block 50 is rotated while being in sliding contact with the valve block 35.

Then, by the rotation sensor 27, as shown in FIG.
As shown in (B), when it is detected that the plunger insertion hole 53 of the pump block 50 has reached the position facing the discharge opening 40 of the valve block 35, the solenoid 26 is detected.
Is actuated to pull the actuator 24 toward the solenoid 26 side as shown in FIG.

As a result, the actuator 24 is separated from the friction plate 18, and the rotation of the pulley 14 is not transmitted and is fixed. When the actuator 24 is fixed, the transmission rod 20 engaged via the spline 22 is also not rotated, so that the male screw 21 of the transmission rod 20 is not rotated.
With respect to the nut 17, the nut 17 rotates relatively, and the action of the ball screw causes the transmission rod 20 to move back and forth in the axial direction.

Therefore, by rotating the stepping motor 11 in an appropriate direction, for example, in the reverse rotation direction, the transmission rod 20 and the drive rod 60 move downward, and the plunger 55 as shown in FIG. 6C. Is the discharge opening 40
Be moved to the side. Then, along with this movement, the liquid 7 in the plunger insertion hole 53 is discharged through the discharge port 41 to the discharge needle 4.
6 is discharged.

The discharge amount of the liquid 7 is determined by the plunger 55
Can be set by the amount of movement of the stepping motor 11, that is, the amount of rotation of the stepping motor 11,
The number of pulses designated to operate the motor 11 with the rotation amount corresponding to the discharge amount is transmitted to the motor 11. Therefore, in FIG. 6C, the plunger 55 is moved to the lower end position of the plunger insertion hole 53, but if the discharge amount is small, it is moved only to the intermediate position of the plunger insertion hole 53.

In the present embodiment, when the discharge is completed after the predetermined number of pulses have been moved, the stepping motor 11 is rotated in the reverse direction by a predetermined amount (for the reverse rotation of the motor 11 which has been moved to the discharge opening 40 side of the plunger 55). Plunger 55
To move the plunger 55 upward to rotate the plunger 55
Is slightly increased. Since negative pressure is generated by this operation, the liquid 7 remaining in the ejection needle 46 portion from the ejection port 41 is returned to the plunger insertion hole 53 side, and the liquid dripping from the tip of the ejection needle 46 can be reliably prevented.

When the reverse rotation of the stepping motor 11 is completed, the operation of the solenoid 26 is turned off and the actuator 24 is brought into close contact with the toothed pulley 14 again. As a result, the pump block 50 rotates as the stepping motor 11 rotates. The rotation direction of the stepping motor 11 when rotating the pump block 50 may be either forward or reverse, but in the present embodiment, the motor 11 is rotated in the reverse direction only when the plunger 55 is moved to the discharge opening 40 side. In other cases (when the pump block 50 is rotated and when the plunger 55 is raised), it is set to rotate in the forward direction.

Then, by the rotation sensor 27, as shown in FIG.
As shown in (D), when it is detected that the plunger insertion hole 53 of the pump block 50 has reached the position facing the suction opening 43 of the valve block 35, the solenoid 26 is activated again to move the plunger 55 forward and backward. Switch to. Then, by directly rotating the motor 11 as it is, the transmission rod 20 rises, the drive rod 60 urged to the transmission rod 20 side by the coil spring 64 also rises, and as shown in FIG. The plunger 55 biased to the drive rod 60 side by the coil spring 56 also rises.

When the upper end detection sensor 28 detects that the transmission rod 20 has been raised to the upper end position, the solenoid 26 is turned off again and the rods 20, 60 are connected.
The forward / backward movement of is stopped and returns to the origin position of FIG. Hereinafter, a predetermined amount of the liquid 7 is sequentially ejected by repeating the above-mentioned operations.

As described above, it is possible to switch between the rotating operation of the pump block 50 and the advancing / retreating operation of the plunger 55 by turning on / off the solenoid 26. Therefore, in this embodiment, the stepping motor 11, the pulleys 12, 1 are used.
4, 16, belt 15, nut 17, friction plate 18, transmission rod 20, actuator 24, coil spring 25, solenoid 26, sensors 27, 28, drive rod 60, rotation transmission rod 62, and coil spring 64. And a plunger advancing / retreating drive means.

According to this embodiment, the following effects can be obtained. That is, since the container 30 is provided in the pump portion 3 and the liquid 7 is put in the container 30, the transfer distance of the liquid 7 can be shortened, and even the highly viscous liquid 7 can be provided without the pressurizing means. It can be reliably supplied to the insertion hole 53. Moreover, since the transfer distance of the liquid 7 is short, the suction efficiency can be improved. Also, the container 30
When replenishing and replenishing the liquid 7 by attaching and detaching the pump, the structure is simplified because no transfer means such as a pressure pump is required.
Can be provided at low cost.

Further, when the discharge amount is small with respect to the volume of the container 30 such as when discharging a very small amount of liquid 7, if the container 30 is filled with the liquid 7, the discharge amount for half a day or one day Therefore, even when the container 30 is detached and the liquid 7 is replenished, workability and productivity do not decrease. At the time of replenishing the liquid 7, a liquid level gauge may be provided,
It can be easily managed by setting a replenishment cycle from the discharge amount per fixed time.

Since the valve block 35, the pump block 50, the plunger 55, etc. are arranged in the container 30 in which the liquid 7 is contained, even if the liquid 7 leaks from the sliding contact surfaces of the plunger insertion hole 53 and the plunger 55, those The liquid 7 only returns to the inside of the container 30, and the liquid 7 does not leak to the outside of the pump unit 3 or the drive unit 2 side. For this reason, it is not necessary to provide the pump portion 3 with a sealing material such as an O-ring for preventing liquid leakage from the sliding contact surface, and the structure can be simplified and the cost can be reduced and the cost can be provided at a low cost. You can Moreover, 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 the present embodiment, the maintenance work is easy. It can be carried out.

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, the liquid 30 is temporarily stored in the container 30 and thus the pressurized liquid is used. The pressure of 7 can be reduced. Therefore, the pressure in the pump unit 3 can be lowered even if a pressure pump is used, and liquid leakage due to pressurization can be prevented.

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 41 are separated from each other. According to this embodiment, the plunger for discharging the liquid 7 is used. Since 55 is very close to the discharge port 41 and the discharge needle 46, there is no delay in discharging the liquid 7.

Solvents such as alcohols, which have a low boiling point and are easily vaporized, tend to generate bubbles when the flow becomes complicated in a conventional pump, such as when sucking into the pump or passing through a check valve, and these bubbles accumulate. Although the liquid 7 may not be discharged, according to the present embodiment, the pump portion 3 and the discharge port 41 are extremely close to each other, and the liquid can be sucked from both ends of the suction port 42 to widen the suction area of the liquid 7. Since the liquid 7 can smoothly flow in and the flow does not become complicated, the suction negative pressure can be reduced and bubbles can be generated without causing the liquid 7 to be normally discharged. Therefore, it can also be used to eject the liquid 7 that is easily vaporized. 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 pump block 50 and the valve block 35 provided at the lowermost end of the container 30, and the liquid 7 containing no bubbles can always be discharged. Furthermore, since the pump block 50 and the valve block 35 are formed at the lowermost end of the container 30,
Since the liquid 7 can be sucked and discharged from the bottommost portion of the container 30, the residual liquid can be reduced and the accumulation of precipitates can be prevented.

The discharge port 41 and the suction port 42 of the valve block 35 are sealed by the sliding contact surfaces 38 and 51 which are slidably contacted at the end surfaces in the direction orthogonal to the axis. Therefore, a rubber product such as an O-ring is also required in this portion. Can be fully sealed without Therefore, it is possible to eliminate the fluctuation of the discharge amount due to the deformation of the seal material, and it is possible to discharge the liquid 7 with a high accuracy even with an extremely small amount.

Further, the discharge amount and discharge speed of the liquid 7 can be easily adjusted only by controlling the rotation amount and rotation speed of the stepping motor 11 using a pulse signal, and the handleability can be improved. . In addition, the plunger 5
Since the liquid 7 is sucked and discharged by the movement of the liquid 5, the accuracy of the discharge amount can be improved as compared with a type of pump that discharges the liquid by air pressure or the like, and even a very small amount of the liquid 7 can be accurately discharged.

Since the container 30, the valve block 35, the pump block 50, etc., which come into contact with the liquid 7 of the pump part 3 can be formed of a material having excellent chemical resistance such as stainless steel or ceramics, various discharge liquids 7 can be obtained. It can be handled. Further, since the pump part 3 and the drive part 2 are separated, it is possible to use stainless steel or ceramics having a high unit price only in the pump part 3, and it is possible to provide the chemical resistant pump 1 at a low price. it can.

The drive unit 2 and the pump unit 3 can be easily separated by removing the cap nut 33. Therefore, only the pump part 3 can be cleaned and maintenance can be performed easily. Even when the type of the discharge liquid 7 is changed, the maintenance can be performed easily.

Conventionally, when performing two different operations such as the rotation operation of the pump block 50 and the advance / retreat operation of the plunger 5, it is common to use two stepping motors. There were problems that miniaturization was difficult and cost was high. However, in the present embodiment, attention is paid to the fact that the rotating operation of the pump block 50 and the advancing / retreating operation of the plunger 5 are not performed at the same time, and a so-called clutch-like action by turning on / off the solenoid 26 is utilized. Even if the number of stepping motors 11 is one, the above two operations can be switched and realized. Therefore, the plunger pump 1 can be downsized and can be provided at low cost.

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, the rotation driving means of the pump block 50 and the advancing / retreating driving means of the plunger 55 are not limited to those in the above-described embodiment, but may be, for example, a plurality of stepping motors, an air cylinder, a cam, or the like. It may be set appropriately.

Furthermore, in the above embodiment, the suction completion state shown in FIG. 6 (A) was set as the origin position. However, depending on the type of the liquid 7 to be discharged, for example, the discharge completion as shown in FIG. 6 (C). The origin position may be another state such as the position.
However, if the suction completion state is set to the origin position, since the discharge port 41 is blocked by the pump block 50 when the pump 1 is stopped, there is an advantage that liquid dripping can be reliably prevented. . The selection of this reference state can be easily controlled by the controller.

In the above embodiment, the pump block 50 is provided with only one plunger insertion hole 53.
You may provide two or more pieces. At this time, as shown in FIG. 8, two plunger insertion holes 53 are formed at positions communicating with the discharge opening 40 and the suction opening 43, respectively.
As shown in FIG. 9, three plunger insertion holes 53 are formed so that one insertion hole 53 communicates with the discharge opening 40 and the other two insertion holes 53 communicate with the suction opening 43. Independently driving the plungers inserted into the plunger insertion holes 53 so that the liquid can be sucked and discharged at the same time is preferable in terms of improving efficiency.

Further, as shown in FIG.
3 and the suction opening 44 are changed to a long groove shape or the like, and one plunger insertion hole 53 is used as the discharge opening 43 or the suction opening 44.
When it comes off, the next other plunger insertion hole 53 starts to be positioned at the discharge opening 43 and the suction opening 44,
The liquid may be sucked and discharged continuously.

Further, the suction port 42 of the pump block 35 is not limited to the groove-shaped one, but may be formed inside the pump block 35 so as to connect the suction opening 43 and the opening formed in the tapered surface 39. Good. In addition, the shape of the container 30 of the pump unit 3, the shape of the pump 1 as a whole, and the like may be appropriately set in the implementation.

[0058]

According to the plunger pump of the present invention as described above, a sealing material for preventing liquid leakage can be eliminated, and a highly viscous liquid can be discharged without using a pressure pump.

[Brief description of drawings]

FIG. 1 is a front view showing a plunger pump according to an embodiment of the present invention.

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

FIG. 3 is a vertical cross-sectional view showing a state in which a solenoid of the drive unit of the above embodiment is operated.

FIG. 4 is a vertical sectional view showing a pump section of the embodiment.

FIG. 5 is a perspective view showing a valve block and a pump block of the pump section of the embodiment.

FIG. 6 is an explanatory view showing the operation of the pump section of the embodiment.

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

FIG. 8 is a schematic top view showing a valve block and a pump block of a modified example of the invention.

FIG. 9 is a schematic top view showing a valve block and a pump block of a modified example of the invention.

FIG. 10 is a schematic top view showing a valve block and a pump block of a modified example of the present invention.

[Explanation of symbols]

 1 Plunger Pump 2 Drive Part 3 Pump Part 7 Liquid 10 Body 11 Stepping Motor 12, 14 Toothed Pulley 15 Toothed Belt 18 Friction Plate 20 Transmission Rod 24 Actuator 26 Solenoid 30 Container 35 Valve Block 38 Sliding Contact Surface 40 Discharge Opening 41 Discharge Port 42 Suction port 43 Suction opening 50 Pump block 51 Sliding surface 53 Plunger insertion hole 55 Plunger 60 Drive rod

Claims (2)

[Claims] 1. A container having a discharge port for discharging a liquid, a valve block disposed inside the discharge port in the container and having a sliding contact surface facing the inside of the container, and penetrating the valve block. A discharge port that is formed to communicate the discharge opening formed on the sliding contact surface with the discharge opening of the container, an intake opening formed on the sliding contact surface of the valve block, and exposed inside the container of the valve block. An intake port that communicates with the opening, and while being rotatably supported in the container in a state where the sliding contact surface at one end is in contact with the sliding contact surface of the valve block,
A pump block having at least one plunger insertion hole formed along the axial direction at a position that can communicate with the discharge opening and the suction opening of the valve block, and slidable in the plunger insertion hole of the pump block in the axial direction. A plunger inserted into the pump block, an urging means for urging the pump block toward the valve block side, a rotational drive means for rotationally driving the pump block, and a plunger insertion of the pump block by being rotated by the rotational drive means. A plunger advancing / retreating drive means for driving the plunger in the suction direction when the hole is in communication with the suction opening, and for driving the plunger in the discharge direction when the plunger insertion hole is in communication with the discharge opening; A plunger pump characterized by being provided. 2. The plunger pump according to claim 1, wherein a plurality of plunger insertion holes and a plurality of plunger insertion holes are provided in the pump block, and at least one plunger insertion hole communicates with a discharge opening of the valve block. In addition, at least one other plunger insertion hole is configured to communicate with the suction opening of the valve block, and the plunger advancing / retreating drive means is configured to be able to independently drive each plunger. Plunger pump to do.