JPS6211348Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a trochoid pump.

Trochoid pumps are used as pumps for pest control machines. A trochoid pump is provided in a casing with an inner rotor whose tooth profile is formed by an envelope line based on a trochoid curve, and an outer rotor which has an arcuate tooth profile that meshes with the inner rotor and is driven by the inner rotor. Become. However, since conventional pumps of this type were made of metal materials, they could be oxidized and corroded by chemicals.
There were problems in using it for anti-throwing machines, etc.

The purpose of the present invention is to solve these conventional problems, and its feature is that in a trochoid pump equipped with an inner rotor and an outer rotor in a casing, the inner rotor and the outer rotor are The outer rotor is made of resin, and a partition plate interposed between both sides of the rotor in the axial direction and the casing, and a tooth tip of the inner rotor are provided so as to be in sliding contact with the inner circumferential surface of the outer rotor. The inner rotor includes an elastic body, and the inner rotor includes a boss portion that is fitted onto a drive shaft, a side plate portion on one axial end side of the boss portion, and a plurality of circumferential portions that protrude from the side plate portion toward the other axial end side. The elastic body has an outer surface that protrudes in an arc shape continuously with the pair of adjacent outer walls, and an inner surface that extends from the side plate and the end surfaces of the adjacent pair of outer walls from radially outward. The abutting arcuate surface portion and the mounting portion that fits between a pair of adjacent outer wall portions are integrally formed.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In FIGS. 1 to 3, 1 is a motor;
is its output axis. 3 is a trochoid pump,
It has a casing 4, an inner rotor 5, and an outer rotor 6. The casing 4 has a casing main body 7 that is a cylindrical body with a bottom and a side cover 8 on the open side thereof, and is fastened to the motor 1 with a mounting screw 9. The side cover 8 is provided with an inlet 10 and an outlet 11, each of which is connected to a hose. The inner rotor 5 and the outer rotor 6 are integrally molded from a chemical-resistant synthetic resin material. As shown in FIGS. 4 and 5, the inner rotor 5 includes a boss portion 12 fitted onto the output shaft 2, and a boss portion 1
a side plate portion 13 on one axial end side of 2, and the side plate portion 13
It is integrally formed with a plurality of circumferential outer wall portions 14 protruding from the outer wall portion 14 toward the other end in the axial direction, and an elastic body 15 is provided at the tooth tip portion thereof. The elastic body 15 is made of a wear-resistant rubber material or the like, and as shown in FIG. A circular arc surface portion 17 is formed. Arc surface part 1
7 has an outer surface that protrudes in an arc shape continuously from the pair of adjacent outer wall portions 14, and an inner surface that contacts the end surfaces of the side plate portion 13 and the pair of adjacent outer wall portions 14 from the outside in the radial direction. The outer rotor 6 is rotatably fitted within the casing 4. Partition plates 18 and 19 made of stainless steel, for example, are interposed between the casing 4 and both sides of the rotors 5 and 6 in the axial direction, respectively. The partition plate 18 connects the casing body 7 and the rotor 5,
6 and is unrotatably locked by an engaging portion on the casing body 7 side that engages with the notch portion 20. The partition plate 19 is interposed between the rotors 5, 6 and the side cover 8, and is unrotatably locked by an engaging portion on the side cover 8 side that engages with the notch 21. Incidentally, holes 22, 23, 24 are eccentrically provided in the casing body 7 and the partition plates 18, 19 so that the output shaft 2 is rotatably fitted therein.
Further, two notch holes 25 and 26 are provided in the partition plate 19 so as to communicate with the suction port 10 and the discharge port 11.

In the trochoid pump having the above configuration, when the motor 1 is operated, the inner rotor 5 rotates via its output shaft 2, and the elastic body 15 slides on the inner peripheral surface of the outer rotor 6.
It also rotates with a delay, compresses the chemical liquid etc. sucked in from the suction port 10, and discharges it from the discharge port 11 side. In this case, since the inner rotor 5 and outer rotor 6 are integrally molded from resin,
Oxidation and corrosion that occur when using metal materials can be prevented. Furthermore, when the rotors 5 and 6 are injection molded, the precision achieved by machining cannot be achieved due to sink marks, and the discharge pressure decreases. However, since the partition plates 18 and 19 and the elastic body 15 are provided, There is also no problem of a drop in discharge pressure. Furthermore, since the same type of materials do not come into contact with each other, durability is also improved.

Note that the elastic body 15 may be attached by a method other than adhesive.

In the present invention, since the inner rotor and outer rotor are made of resin, oxidation and corrosion can be prevented. Furthermore, since partition plates are interposed between both sides of the rotor and the casing, and the tooth tips of the inner rotor are made of elastic bodies, there is no drop in discharge pressure and durability is improved. Furthermore, the inner rotor is an integrally molded product made of resin, and includes a boss that fits onto the drive shaft, a side plate on one axial end of the boss, and a side plate on the other axial end of the boss. Since it is provided with a plurality of circumferentially protruding outer wall portions, no wasted material is used and the weight can be reduced. Moreover, the elastic bodies provided at the tooth tips of the inner rotor slide against the inner circumferential surface of the outer rotor during driving, but are attached to the inner rotor via attachment parts that fit between a pair of adjacent outer walls. Since the inner surface of the arcuate surface portion contacts the side plate portion of the inner rotor and the end surfaces of the pair of adjacent outer wall portions from the outside in the radial direction, it is possible to securely attach the inner rotor, and to prevent the elastic body from contacting the inner circumferential surface of the outer rotor. Sufficient contact pressure can be ensured and discharge pressure increases.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a view taken along the - arrow in FIG. 1, FIG. 3 is an exploded perspective view, and FIG. 4 is a front view of the inner rotor.
FIG. 5 is a view taken along the - arrow in FIG. 4, and FIG. 6 is a perspective view of the elastic body. 3... Trochoid pump, 4... Casing,
5...Inner rotor, 6...Outer rotor,
15... Elastic body, 18, 19... Partition plate.

Claims (1)

[Scope of utility model registration request] In a trochoid pump including an inner rotor 5 and an outer rotor 6 in a casing 4,
The inner rotor 5 and the outer rotor 6 are made of resin, and the partition plates 18 and 1 are interposed between the casing 4 and both sides of the rotors 5 and 6 in the axial direction.
9, and an elastic body 15 provided at the tooth tips of the inner rotor 5 so as to be in sliding contact with the inner circumferential surface of the outer rotor 6, and the inner rotor 5 has a boss portion 12 fitted to the driving shaft 2. , a side plate portion 13 on one axial end side of the boss portion 12, and a plurality of circumferential outer wall portions 14 protruding from the side plate portion 13 toward the other axial end side.
The elastic body 15 has an outer surface that protrudes in an arc shape continuously with the pair of adjacent outer wall sections 14, and an inner surface that extends radially outward from the end surfaces of the side plate section 13 and the pair of adjacent outer wall sections 14. a circular arc surface portion 17 that comes into contact with the
A mounting portion 16 that fits between a pair of adjacent outer wall portions 14
A trochoid pump characterized by being integrally formed with.