JPH0319915B2 - - Google Patents

Description

Detailed Description of the Invention (a) Field of Industrial Application The present invention relates to a rotary valve pump device, particularly a rotary valve pump device used in a fertilization device of a rice transplanter, and more specifically, to a rotary valve pump device used in a fertilization device of a rice transplanter. This relates to the valve part that switches between intake and discharge.

(b) Conventional technology Conventionally, a rotary valve pump device has a valve shaft rotatably disposed in a valve case, a valve body covered with a valve body fixed to the case, and a sealing member disposed on the valve body. The seal member is configured to seal between the valve shaft and the valve body, and the rotation of the valve shaft with respect to the seal member switches suction and discharge of liquid from a valve switching hole formed in the valve shaft, Furthermore, a reciprocating pump was driven back and forth to suck in and discharge liquid.

(c) Problems to be Solved by the Invention Therefore, in this pump device, a special sealing member had to be fixed to the valve body in order to seal between the valve shaft and the valve body.

(d) Means for solving the problem The present invention aims to solve the above-mentioned problems. For example, as shown in FIGS. 1 to 3, the valve V is rotated to In the rotary valve pump device 1, which switches suction and discharge of liquid and further reciprocates a reciprocating pump P to suck and discharge liquid, two partition protrusions 5a and 5b made of flexible members are provided on the case 6 of the valve V. The valve body 5 is fixed thereto, and the valve shaft 3 is rotatably supported by contacting these partition protrusions, and the valve shaft 3 has a hollow part formed in the shaft and communicating with the reciprocating pump P. A suction chamber C is formed between the chamber B and the valve body sealed by the partition protrusions 5a and 5b.
Or valve switching hole 3 communicating with delivery chamber D
a, and a crank arm 20 for driving the reciprocating pump is integrally provided, and furthermore, the head 16 of the reciprocating pump P is fixed to the case 6 of the valve V, and the reciprocating pump Moving part 3
The pin 28 connected to the crank arm 2 is swingably connected to the base plate 29 on which the valve case 6 is fixed via the arm 27.
0 via a crank rod 26, and the valve shaft 3 and the pin 28 are arranged in parallel, and the reciprocating pump P and the crank rod 26 are arranged so that their axial operating lines are substantially parallel to each other. The valve shaft 3, the crank arm 20, the crank rod 26, and the pin 28 constitute a serial drive path, and the rotation of the valve shaft 3 drives the reciprocating pump P and controls the flow of liquid from the valve switching hole 3a. A rotary valve pump device is characterized in that it is configured to be able to switch between suction and discharge.

(e) Effect Based on the above-described configuration, when the valve shaft 3 rotates while being in contact with and sealed against the partition protrusions 5a and 5b of the valve body 5, suction and discharge of the valve V are switched based on this rotation, and the valve shaft 3 Liquid is discharged or sucked from the formed valve switching hole 3a.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 and 3, the rotary valve pump device 1 includes a reciprocating pump P and a valve V.
A hollow valve shaft 3 is rotatably supported in a case 6 of the valve V by bearings 7, 7.

In addition, the valve shaft 3 has a valve switching hole 3.
A valve body 5 made of an elastic member such as rubber is fixed on the inner circumferential surface of the case 6 facing the circumferential portion of the valve shaft 3 in which the switching hole 3a is formed. As shown in FIGS. 1 and 4, an upper partition protrusion 5a and a lower partition protrusion 5b are symmetrically formed at vertically opposing positions on the inner circumferential surface of the valve body 5.
The projections 5a and 5b have cavities 5a' and 5, respectively.
b' is provided and abuts against the valve shaft 3 with elastic force. Furthermore, a suction hole 5c and a delivery hole 5d are provided at left and right opposing positions of the valve body 5.
The suction hole 5c is communicated with a suction pipe 9 disposed penetrating through the case 6, and the delivery hole 5d is similarly communicated with a delivery pipe 10.

Further, a packing 11 and an oil seal 12 are disposed on the inner circumferential surface of the case 6 at the front side adjacent to the valve body 5 so as to cover the valve shaft 3. Further, the valve shaft 3 has four liquid discharge/inlet holes 3b formed at 90° intervals adjacent to the valve switching hole 3a, as shown in FIG. A spacer 13 made of a rubber material is arranged adjacent to the valve body 5 on the inner peripheral surface of the case 6 facing the circumferential portion of the valve shaft 3. Further, an oil seal 15 is disposed on the inner peripheral surface of the case 6 adjacent to the spacer 13, covering the valve shaft 3, and the oil seal 15, the spacer 13, and the outer peripheral surface of the valve shaft 3 form a bellows space A. is formed. Further, a bellows hole 13a is formed penetratingly below the spacer 13, and the bellows hole 13a communicates the bellows space A with the reciprocating pump P through a hole 6a formed in the case 6. . Further, a plug 17 made of a rubber material is fixed to the rear of the liquid discharge/inlet hole 3b in the hollow part of the valve shaft 3, and a valve shaft hollow chamber B is formed in the hollow part of the valve shaft 3. Also, a spring pin 19 is attached to the other end of the valve shaft 3.
The crank arm 20 is connected via the
The crank arm 20 extends to the rear end of the case 6, and has an arm shaft 20a fixed at a position offset by a distance l from the axial center of the valve shaft 3. Further, the plate portion 20b of the crank arm 20 has scales M carved at equal intervals. Further, a collar 21 is attached to the plate 20b of the crank arm 20.
The front side of the collar 21 is in contact with the arm shaft 20a, and the collar 21 covers the arm shaft 20a by forming a space, and the rear side of the collar 21 is tightened with a locking nut 23 via a washer 22. is fixed to the plate 20b. Further, an adjustment plate 25 is fixed to the collar 21, and the rear end of the plate 25 is rotatably supported by the plate 20b of the crank arm 20 around a fulcrum 25a. As the finger point T moves, the plate 20b of the crank arm 20
It is engraved so as to face the scale M engraved on it. Further, a crank rod 26 is rotatably disposed on the collar 21.
6 is connected to the tip of a bellows rod 27 of the pump P via a pin 28. Further, as shown in FIG. 3, the bellows rod 27 is rotatably supported at its proximal end by a bracket 29 to which the case 6 is fixed. Further, the reciprocating pump P consists of a bellows pump 16, the lower end of which is closed, is connected to the pin 28 via the bracket 30, and the upper end of the pump 16, which is open, is fixed to the case 6. At the same time, the pump chamber communicates with the hole 6a.

Since this embodiment has the above configuration,
When the valve shaft 3 is rotated in the direction of arrow Y in conjunction with the planter of the rice transplanter, the crank arm shaft 20a, which is offset by a distance l from the shaft 3, is eccentrically moved. The collar 21, which is disposed eccentrically by a predetermined distance with respect to the arm shaft 20a, is moved eccentrically based on the eccentric distance, and the eccentric movement is transmitted to the bellows pump 16 via the crank rod 26 and the bellows rod 27. The bellows pump 16 is reciprocated. At that time, when the crank arm 20 is at its top dead center due to eccentric movement, the valve switching hole 3a of the valve shaft 3 is
As shown in FIG. 4, the bellows pump 16 is located at a vertically upper position a and aligned with the upper partition protrusion 5a, and the bellows pump 16 is at its top dead center, that is, it is pushed up to the maximum. From this state, when the valve shaft 3 is rotated in the direction of the arrow Y, the valve switching hole 3a is rotated on the suction side C, and the rotation of the shaft 3 causes the crank arm 20 to move eccentrically, and the bellows pump 16 is rotated. It is pushed downward from the point. Then, due to the suction action of the bellows pump 16, the suction pipe 9
A paste-like fertilizer liquid is sucked into the valve shaft hollow chamber B through the valve switching hole 3a, and the liquid is further sucked into the pump chamber inside the bellows pump 16 through the liquid discharge/input hole 3b and the bellows space A. . Further, when the valve shaft 3 is rotated and the crank arm 20 is rotated to its bottom dead center, the valve switching hole 3a of the shaft 3 is connected to the valve 5.
The bellows pump 16 is aligned with the lower partition protrusion 5b (position b in FIG. 4), and the bellows pump 16 is at its bottom dead center, that is, in the maximum depressed state. As the valve shaft 3 rotates in the direction of arrow Y, the valve switching hole 3a of the valve shaft 3 is rotated toward the delivery pipe side D, and the crank arm 2
0 is eccentrically moved, and the bellows pump 16 is pushed upward from its bottom dead center. Then, due to the discharge action of the bellows pump 16, liquid flows from inside the pump 16 into the bellows space A and the liquid discharge hole 3b.
The liquid is discharged into the valve shaft hollow chamber B through the valve switching hole 3a, and the liquid is further discharged into the delivery pipe 10 through the valve switching hole 3a. Furthermore, valve shaft 3
is rotated, the valve switching hole 3a changes to the valve 5.
The crank arm 20 is aligned with the upper partition protrusion 5a and reaches its top dead center, and as the valve shaft 3 rotates, liquid is sucked from the suction pipe 9 in the same manner as described above.

In addition, in this embodiment, the valve shaft 3
Although the valve switching hole 3a was formed through the valve switching hole 3a,
As shown in FIG. 6, on the outer periphery of the valve shaft 3,
A flat portion 3f is formed at a height H from the axis of the shaft 3 (H is the distance from the tips of the partition protrusions 5a and 5b to the axis of the shaft 3), and a valve switching hole 3a' is formed in the flat portion 3f. When penetrated, even if the valve shaft 3 rotates, the partition protrusions 5a, 5b will not get caught in the valve switching hole 3a', and the partition protrusions 5a, 5b will not be damaged. At that time, when the partition protrusions 5a and 5b pass through the valve switching hole 3a', the reciprocating pump P is at the top dead center or the bottom dead center, and the liquid is not sucked or discharged, so there is no possibility of liquid leakage. There is no partition protrusion 5a, 5
Before and after b passes through the valve switching hole 3a', pressure changes due to suction and discharge of liquid and partition protrusion 5 occur.
The amount of deformation of a and 5b is proportional, so there is no leakage.

(G) Effects of the Invention As explained above, according to the present invention, the valve V is provided with two partition protrusions 5a made of flexible members,
5b is fixed, and the partition protrusions 5a and 5b each abut against the valve shaft 3 to seal between the shaft 3 and the valve body 5. There is no need for a special sealing member to seal between the valve V, the structure of the valve V is simplified, timing adjustment with the reciprocating pump P is simple and reliable, and maintenance is easy. Also, valve case 6, valve shaft 3
and crank arm 20 and crank rod 26
, the pin 28 and the reciprocating pump P form a closed loop that is rectangular in side view. Therefore, the force in the axial direction of the crank rod 26 acting on the crank arm 20 and the valve shaft 3 is caused by the force acting on the head 16 of the reciprocating pump P. is canceled by the force acting on the case 6 from the pump chamber, and is carried as an internal force of the closed loop,
As a result, a large force is not applied to the substrate 29, etc., and a simple structure is sufficient for mounting and supporting the rotary valve pump device 1, and the pump device 1 itself does not require a strong case, etc., and has a simple structure. Therefore, the rotary pump device 1 can be configured to be compact and lightweight. Furthermore, the rotation of the valve shaft 3 switches between sucking and discharging the liquid directly connected to the reciprocating pump P, and the crank arm 2
0. Since the reciprocating pump P is driven in series via the crank rod 26 and pin 28, the pump P
The timing of the rotary valve V can always be accurately and reliably matched, and the pump can be operated reliably. Furthermore, partition protrusions 5a, 5b
By forming the cavities 5a', 5b' in the valve shaft 3, the deformation of the protrusions 5a, 5b is always directed outward from the axis, and the protrusions 5a, 5b are dragged by the rotation of the valve shaft 3. The reciprocating pump P is not deformed and the airtightness is not deteriorated.
Even if an abnormality such as clogging occurs in the suction pipe 9 or the delivery pipe 10, the partition protrusions 5a and 5b will be greatly deformed due to the higher than normal hydraulic pressure caused by the abnormality, reducing the pressure and causing reciprocating movement. Pump P
and prevent damage to the valve V.

Further, a cavity 5 is provided in each of the partition protrusions 5a and 5b.
Forming a' and 5b' further improves the elasticity of the protrusion, improving the sealing effect and improving the pressure relief effect in the event of an abnormality such as clogging.

Furthermore, if the partition protrusions 5a and 5b are formed in symmetrical positions, the suction and discharge directions can be reversed simply by changing the rotation direction of the valve shaft 3.

Furthermore, if the valve switching hole 3a' portion on the outer periphery of the valve shaft 3 is made into a flat surface 3f, the partition protrusion 5a,
5b does not get wedged into the valve switching hole 3f, and the life of the protrusion and thus the valve V can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the valve body part of a rotary valve pump device according to the present invention, in which a is a front view, b is a side view, FIG. 2 is a side sectional view showing the rotary valve pump device, and FIG. Front view, 4th
The figure is a sectional view taken along the line of Fig. 2, and Fig. 5 is a sectional view taken along the line of Fig. 2.
FIG. 6 is a sectional view showing a valve body portion of a rotary valve pump device according to another embodiment, in which a is a front view and b is a side view. 3... Valve shaft, 3a... Valve switching hole, 5... Valve body, 5a, 5b... Partition protrusion (5a... Upper partition protrusion, 5b... Lower partition protrusion), 6... Case, 16 ... Pump head (bellows pump), 20 ... Crank arm, 2
1...color, 26...crank rod, 27...
...Arm (bellows rod), 28...Pin, 2
9... Board (bracket), 30... Reciprocating drive unit (bracket), B... Hollow chamber, P... Reciprocating pump, V... Valve.

Claims (1)

[Scope of Claims] 1. A rotary valve pump device that rotates a valve to switch between sucking and discharging liquid, and further drives a reciprocating pump to suck in and discharge liquid, wherein the case of the valve is made of a flexible member. A valve body having two partition protrusions is fixed, and a valve shaft is rotatably supported by contacting these partition protrusions, and a valve shaft is formed in the shaft and communicates with the reciprocating pump. forming a valve switching hole that communicates between a hollow chamber and a suction chamber or a delivery chamber that is sealed by the partition protrusion and formed between the valve body;
A crank arm for driving the reciprocating pump is integrally provided, a head of the reciprocating pump is fixed to the case of the valve, and a pin connected to the reciprocating part of the reciprocating pump is connected to the reciprocating pump. A valve case is swingably connected to a fixed base plate via an arm, and connected to the crank arm via a crank rod, and the valve shaft and pin are arranged in parallel, and the reciprocating pump and The crank rods are arranged so that their axial operating lines are substantially parallel, and the valve shaft, crank arm, crank rod, and pin form a serial drive path, and rotation of the valve shaft drives the reciprocating pump. A rotary valve pump device configured to be able to drive and to switch between suction and discharge of liquid from the valve switching hole. 2. The rotary valve pump device according to claim 1, wherein each of the partition protrusions has a cavity. 3. The rotary valve pump device according to claim 1, wherein the partition protrusions are formed at symmetrical positions. 4. The rotary valve pump device according to claim 1, wherein the valve switching hole portion on the outer periphery of the valve shaft is flat.