JPH0643509Y2 - Rotary pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a rotary pump suitable for feeding a fluid having a relatively high viscosity.

<Prior Art> Conventionally, for example, a flex rotary pump that rotates a rotor with a flexible vane in a pump chamber with an eccentric peripheral wall is used as a small pump for feeding and fertilizing paste fertilizer with a fertilizer applicator for paddy fields. It had been. In addition, as a general type used for water, oil, etc., a rotary pump having a rotor eccentrically driven by an eccentric shaft in a casing is disclosed in Japanese Utility Model Publication Nos. 43-31493 and 51-36107. It has been known.

<Problems to be solved by the invention> These pumps have advantages such as a simpler structure and smaller rotation torque than other rotary pumps, but both have a cylindrical rotor outer peripheral surface and a circular inner peripheral surface of the casing. Since there is always one sliding contact (sealing point) with the surface, that is, point contact in cross section, the sealing performance is generally poor and the pumping efficiency is low. In that case, there was a defect that the sealing property was remarkably deteriorated.

<Means for Solving the Problems> The pump of the present invention for solving the above problems is a circular pump chamber 21 having a side wall formed with an open end in a casing 1. Intake port close to 27
And the discharge port 29 are opened, and the rotor 3 having the contact portion 3b made of a member having a certain elasticity and having an axis center eccentric with respect to the center of the pump chamber 21 inside the pump chamber 21 is installed. A partition plate 31 is provided axially supported on the casing 1 side, and a partition plate 31 for partitioning the pump chamber 21 between the suction port 27 and the discharge port 29 is provided between the outer circumference of the rotor 3 and the inner circumferential surface of the casing 1. In the pump chamber 21, a pin 30 is provided, one end of which is inserted into and supported by the casing 1 and is parallel to the shaft center. One end of the partition plate 31 is attached to the pin 30 and the rotor 3 is driven eccentrically. The outer peripheral side of the rotor 3 is interconnected so as to regulate the rotation of the rotor 3, and with the non-rotating eccentric drive of the rotor 3, a large number of sliding contact and disconnection are sequentially made on the inner periphery of the pump chamber 21 at a plurality of adjacent positions. The ridge 3c of the bus bar to the contact portion 3b on the outer peripheral surface of the rotor 3 As well as projecting to the direction,
In the cross section of the ridge 3c, a hole 3d for imparting elasticity to the peripheral surface of the ridge 3c is provided, and a peripheral edge contacting the inner peripheral side of the pump chamber 21 is left on the side end surface of the contact portion 3b. To form a concave portion 3e, and a cap 23 for closing the pump chamber 21 is attached to the open end side of the pump chamber 21 in a state where the rotor 3 is incorporated, and the partition plate 31 is slidably contacted with the rotor 3 and the pump chamber 21. Ridge 3c
It is characterized in that the pump chamber 21 is partitioned into a variable-capacity suction side and a variable-volume suction side by means of and.

<Operation> When the shaft 9 is rotated and the eccentric shaft 13 is eccentrically rotated, the rotor 3 is eccentrically driven while its rotation is restricted by the pin 30 and the partition plate 31, and the hollow hole in the peripheral surface of the rotor 3 is accompanied by the eccentric drive. The ridges 3c formed with 3d are arranged such that the one on the suction port 27 side to the one on the discharge port 29 side are elastically slidably contacting the inner peripheral surface of the casing 1 and separated from each other. The liquid is sucked from the suction port 27 and discharged to the discharge port 29. In addition, the side surface of the rotor 3 is also recessed 4e leaving the peripheral edge so that the peripheral edge elastically slidably contacts the inner surface of the pump chamber 21.
Are formed.

At the time of the eccentric drive, two or more ridges adjacent to each other are slidably contacted at almost all positions on the inner peripheral surface of the casing, and the suction side and the discharge side of the pump chamber 21 are sealed at two or more contact points. While performing a pumping action.

<Embodiment> The embodiment of the present invention shown in the drawings will be described in detail below. A rotor 3 is housed in a cylindrical casing 1, and a shaft is provided at an end of the rotor 3 with an oil seal 5 and bearings 7, 7. A housing 11 that concentrically supports 9 is formed, and the rotor 3 is rotatably supported at its center by an eccentric shaft 13 protruding from the inner end of the shaft 9 via a bush 15. . Inside the pump chamber 4, side plates 17 and 19 which are slidably contacted with both end surfaces of the rotor 3 are fitted, and a pump chamber 21 is formed around the rotor 3, which is located on the open end side of the casing 1. The cap 23 is tightened and the push bolt 25 is screwed into the cap 23 so that the side plates 17 and 19 and the rotor 3 are pressed against each other at the inner end thereof and the inner end of the casing as a whole.

The rotor 3 has a doughnut-shaped core 3a made of metal or the like, and a contact portion 3b made of rubber or resin having elasticity and abrasion resistance integrally fixed around the core 3a. Are projecting ridges 3c having an arcuate cross section at regular intervals (45 ° in the illustrated example) along the axial direction, and the ridges 3c are provided at the center of each ridge 3c on the inner circumference of the casing 1. A hole 3d is formed to improve elasticity when pressed against and to improve sealing performance. On the side surface of the rotor 3, side plates 17,1
Minimize sliding resistance with 9 and pump chamber at contact 21
The concave portion 3e is formed in order to enhance the sealing property of the.

A pin 30 along the axial direction of the casing projects between the openings of the suction port 27 and the discharge port 29 in the pump chamber 21, where the inside of the pump chamber 21 is hermetically blocked between the suction side and the discharge side. One end of a swing arm-shaped partition plate 31 is rotatably supported, and the other end of the partition plate 31 is a pin 33 that is inserted into a hole 3d of a neighboring ridge 3c.
Is connected to the rotor 3 like a hinge.

Corresponding to the partition plate 31, a concave portion 35 is formed on the peripheral surface of the rotor 3 so that the partition plate 31 is housed substantially within the peripheral surface thereof. The concave portion 35 is formed on the outer periphery of the rotor 3 in the illustrated example. 8
One of the ridges 3c provided at equal intervals is intermittently formed, and the intermittent position and both sides thereof are cut out.

In the structure described above, when the shaft 9 rotates counterclockwise in FIG. 1, the rotor 3 tries to rotate eccentrically by the eccentric shaft 13, but the rotor 3 is connected to the partition plate 31 at the upper part thereof to restrict the rotation, so Pin 33 changes due to the change in the rotation trajectory of shaft 13.
The swing locus of the rotor fluctuates, and the movement of both causes the rotor 3 to be eccentrically driven while being rotated by a certain angle.

As the rotor 3 is eccentrically driven, the ridge 3c on the outer circumference of the rotor 3
Are sequentially pressed against and separated from the inner peripheral surface of the casing 1 in the counterclockwise direction in the order shown in FIGS. 3 (A), 1 and 3 (B), and the fluid is sucked into the suction port. It is sucked from 27 and discharged to the discharge port 29 sequentially. During operation, the ridge 3c is in sliding contact with the inner peripheral surface of the casing 1 at two or more points except when the rotor 3 is close to the vicinity of the suction port 27 and the discharge port 29, and maintains a high sealing property.

FIGS. 5 to 7 show a second embodiment of the present invention. In this example, a plate-shaped partition plate 31 is provided at the tip end from the inner peripheral surface of the casing between the suction port 27 and the discharge port 29. It is fixedly provided so as to project inward. The partition plate 31
Has its outer end brought into contact with the inner peripheral surface side of the casing 1 along the axial direction to be locked, and the inner end fixed or fitted to the cap 23 and the pin 30 whose both ends are supported by the casing 1. Supported by the state. The pin 30 is oriented in the same direction as the shaft center of the casing 1. In other words, the partition plate 31 is attached such that the outer end is on the inner peripheral surface side of the casing, the inner end is locked to the pin 30, and the partition plate 31 is sandwiched and fixed to both.

On the outer periphery of the rotor 3 with respect to the partition plate 31, there is formed a groove-shaped guide portion 34 for slidably accommodating the pin 30 from the outer periphery toward the center of the rotor, and when the rotor 3 is eccentrically driven. The rotor 3 is engaged with the pin 30 and its rotation is restricted.

While the embodiment of FIGS. 1 to 4 follows the eccentric drive of the rotor 3 while the connecting end of the partition plate 31 swings and regulates the rotation of the rotor, it will be described later. In the embodiment, the guide portion of the rotor 3 is provided on the inner end side of the partition plate 31 which is fixed in the casing 1 or whose inner end swings.
34 engages and slides while restricting the rotation of the rotor to guide the eccentric drive of the rotor 3, and other operations are common to both embodiments.

<Effect of the Invention> According to the rotary pump of the present invention configured as described above, two or more hollow ridges are provided at almost all positions where the peripheral surface of the rotor during eccentric drive is in contact with the inner peripheral surface of the casing. Since it is elastically performed in the above, there is an advantage that the sealability between the suction side and the discharge side in the pump chamber is good, the contact resistance with the inner peripheral surface of the casing is low, and the pump efficiency is extremely high. In particular, even if solid particles are mixed in the liquid to be fed, the sealing is performed by one of the contact ridges, so that there is an effect of preventing backward leakage.

Further, since the concave portion is formed also on the side end surface of the contact portion of the rotor leaving the peripheral edge, the contact with the pump chamber inner surface side is made elastic by only the peripheral edge of the contact portion side end surface. Even in the part, the rotation resistance due to the elastic contact, the wear of the rotor can be reduced, and the sealing performance can be improved.

In addition, since the rotation restriction during rotor eccentric drive is performed by the pin or the pin and the partition plate that are firmly fixed by being inserted into the casing side, the action of the restriction structure and the guide for eccentric drive are smooth and the operation is stable. There is an advantage that there is little resistance and vibration and the durability of the regulating member is high.

As described above, the rotary pump according to the present invention has excellent sealing properties but has a low rotation resistance, and has a simple structure and a small rotation torque as compared with the conventional rotary pump. It is also suitable for the case where it is driven in conjunction with the traveling wheel drive system as described above.

In addition, since the pump of the present invention has a simple structure, it has a low cost as a whole, is economical in terms of durability and maintenance such as replacement of parts, and has an effect that it can be easily assembled and disassembled.

[Brief description of drawings]

The drawing shows an embodiment of the present invention, FIG. 1 is a side view showing the internal structure of the pump, FIG. 2 is the same sectional view, and FIG.
(A) and (B) are side views showing the operating state of the pump, FIG. 4 is a partial plan view showing the structure of the partition plate in the pump, and FIG.
FIGS. 7 (A) and 7 (B) are a side view of the internal structure of a pump showing another embodiment, a sectional view of the same, and a side view of a pump operating state. 1: Casing, 3: Rotor, 3b: Contact part 3c: Convex strip, 3d: Hole, 3e: Recess 23: Cap, 27: Suction port, 29: Discharge port 30: Pin, 31: Partition plate

Claims (1)

[Scope of utility model registration request] 1. A suction port (27) and a discharge port (29) are opened at positions close to a peripheral wall of a circular pump chamber (21) formed in a casing (1) so that side ends thereof form an open end. The rotor (3) having the contact portion (3b) formed of a member having a certain elasticity and having an axis center eccentric with respect to the center of the pump chamber (21) inside the pump chamber (21) ) Is axially supported on the casing (1) side, and the suction port (2) is provided between the outer periphery of the rotor (3) and the inner peripheral surface of the casing (1).
A partition plate (31) for partitioning the pump chamber (21) is provided between the discharge chamber (7) and the discharge port (29), and one end of the pump chamber (21) is inserted into and supported by the casing (1). A pin (30) parallel to the axis is provided, and one end of the partition plate (31) is attached to the pin (30) and the rotor (3) is attached.
The outer peripheral side of the rotor (3) is interconnected so as to regulate the rotation during eccentric drive of the pump chamber (21), and the non-rotating eccentric drive of the rotor (3) causes the pump chambers (21) to be located at a plurality of adjacent positions. A large number of ridges (3c) that are in sliding contact with each other on the inner circumference and are separated from each other are provided on the contact portion (3b) of the outer peripheral surface of the rotor (3) in the generatrix direction, and A hole (3d) for imparting elasticity is provided on the peripheral surface of the ridge (3c), and a peripheral edge contacting the inner peripheral side of the pump chamber (21) is left on the side end surface of the contact portion (3b). A recess (3e) is formed, and a cap (23) for closing the pump chamber (21) is attached to the open end side of the pump chamber (21) with the rotor (3) incorporated, and the partition plate (31) is provided. The pump chamber (21) is partitioned into a variable-capacity suction side and a variable-capacity discharge side by the ridge (3c) slidably contacting the rotor (3) and the pump chamber (21). Concrete and the rotary pump.