JPH0550090U - Rotary pump - Google Patents

Abstract

(57) [Abstract] [Purpose] There is no need to form a liquid pool such as a bag-like void between the inner peripheral surface of the boss for inserting the rotor drive shaft and the rotor and the sealing O-ring. Make it easy and easy to replace. [Structure] Rotor drive shaft fitting bosses 11A, 11B integrally provided on a casing body 2 forming a pump chamber 3
A ring mounting groove 17 having an L-shaped cross section is provided around the inner peripheral surface of the tip end of the, and the O-ring 1 for sealing is inserted in the L-shaped ring mounting groove 17.
4 is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary pump suitable for transporting liquid foods, and more particularly to a rotor drive shaft fitting boss integrally provided on a casing forming a pump chamber and a rotor fixed to the rotor drive shaft fitted into the boss. The present invention relates to an improvement of a rotary pump having a seal member interposed between the rotary pump and the rotary pump.

[0002]

[Prior Art]

 A conventional rotary pump of this type will be described with reference to FIGS. 2 and 3. A pump chamber 3 is formed in a casing body 2 of a pump casing 1, and an intake port 4 communicating with the pump chamber 3 is formed at an upper end portion and a lower end portion thereof. And a discharge port 5 are formed respectively, and rotors 7A and 7B having pump tooth portions 6 are fitted in the pump chamber 3. The rotors 7A and 7B are externally fitted onto the spline shaft portions 8a and 8b of the rotor drive shafts 8A and 8B driven by a motor (not shown) so as to be integrally rotatable, respectively, and fixed by a rotor lock nut 9, and also the casing body. A casing cover 10 is detachably attached to the casing 2 by means of bolts (not shown).

The rotor drive shafts 8A and 8B are fitted and inserted into rotor drive shaft fitting bosses 11A and 11B, which are integrally projected in the pump chamber 3 of the casing body 2, and are fitted into the bosses 11A and 11B. A sleeve 12 is externally fitted to the rotor drive shafts 8A and 8B at the ends adjacent to the spline shafts 8a and 8b. A ring mounting groove 13 is provided around the inner peripheral surface of each rotor drive shaft fitting boss 11A, 11B at a position spaced inward from the projecting end of the boss 11A, 11B. An O-ring 14 is attached to the groove 13, and by the O-ring 14, the inner peripheral surfaces of the rotor driving shaft fitting bosses 11A and 11B and the sleeve 12 externally fitted to the rotor driving shafts 8A and 8B. The gap is sealed.

Then, by rotating the rotor drive shafts 8A and 8B in synchronism with each other in opposite directions as shown by the arrows in FIG. 2, the pump teeth 6 which rotate in the pump chamber 3 respectively work, The liquid is sucked into the pump chamber 3 from the suction port 4 and is pressurized and sent to the discharge port 5.

[0005]

[Problems to be solved by the device]

 By the way, in the rotary pump having the above-described structure, as is apparent from FIG. 3, a bag-shaped bag is formed between the inner peripheral surface of the rotor drive shaft fitting boss 11A, 11B on the projecting end side and the rotor 7A, 7B. Since the void portion 15 is formed, a part of the pressurized liquid is squeezed from the gap between the projecting end face of the rotor drive shaft fitting boss 11A, 11B and the rotor 7A, 7B during pump operation. There is a problem that it flows into the space 15 and stays there, and the sealing O-ring 14 provided on the inner peripheral side of the rotor drive shaft fitting bosses 11A, 11B has a problem. Since the O-ring 14 is located at a position as shown in FIG. 3 which is separated from the tip of the rotor to the inner side thereof, not only the rotors 7A and 7B but also the casing body 2 must be removed. Must Re, there has been a great problem time and effort is whether the hunt, such as the replacement of the O-ring 14.

In view of the above circumstances, the present invention does not form a liquid pool such as a bag-shaped void between the inner peripheral surface of the boss for inserting the rotor drive shaft and the rotor, and The purpose is to make it easy and easy to replace the seal O-ring.

[0007]

[Means for Solving the Problems]

 In the rotary pump according to the present invention, a ring mounting groove having an L-shaped cross section is provided around the inner peripheral surface of the tip of a rotor drive shaft fitting boss integrally projecting on the casing main body forming the pump chamber. It employs a configuration in which an O-ring for sealing is attached to the groove for mounting the letter ring.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. Since most of the structure of the rotary pump of the embodiment shown in FIG. 1 is similar to that of the conventional rotary pump shown in FIGS. 2 and 3, only the structure necessary for the present invention will be described. However, description of other parts is omitted. Further, the same members as those in the conventional example shown in FIGS. 2 and 3 are designated by the same reference numerals.

A sleeve 16 is interposed between the rotor drive shaft fitting bosses 11A, 11B and the rotor drive shafts 8A, 8B fitted therein, and the sleeve 16 is used for the rotor drive shafts. The shafts 8A and 8B and the rotor shafts 7a and 7b of the rotors 7A and 7B, which are spline-fitted to the shafts 8A and 8B and integrally connected to each other so that their outer peripheral surfaces are flush with each other, are externally fitted to each other. There is.

A ring mounting groove 17 having an L-shaped cross section is provided around the inner peripheral surface of the tip portion of each rotor drive shaft fitting boss 11A, 11B, and an O-ring 14 for sealing is fitted in the mounting groove 17. The O-ring 14 is configured to seal the gaps between the rotor drive shaft fitting bosses 11A, 11B and the rotors 7A, 7B and the sleeve 16. In addition, as shown in FIG. 1, the inner peripheral surfaces of the rotor drive shaft fitting bosses 11A and 11B are tapered so that the inner diameter gradually increases from the tip end side of the bosses 11A and 11B toward the inner side. Has been formed.

Due to the above-mentioned configuration, the conventional bag shown in FIG. 3 is provided between the inner peripheral surface of the boss 11A, 11B for inserting the rotor drive shaft and the rotor 7A, 7B. A liquid pool such as the hollow portion 15 is not formed, and therefore, during pump operation, a part of the liquid pressurized on the high pressure side of the pump chamber 3 may partially protrude from the rotor drive shaft fitting bosses 11A, 11B. The inconvenience of flowing into the bag-shaped void portion 15 through the gap between the surface and the rotors 7A and 7B and staying there is eliminated. A part of the pressurized liquid is appropriately discharged to the low pressure side of the pump 3 through a minute gap formed between the rotors 7A, 7B and the casing body 2.

When the sealing O-ring 14 is worn and needs to be replaced, the casing cover 10 is removed, the rotor lock nut 9 is removed, and the rotors 7A and 7B are removed to remove the O-ring 14. Exchanges can be made.

[0013]

[Effect of the device]

 According to the rotary pump of the present invention, a ring mounting groove having an L-shaped cross section is circumferentially provided on the inner peripheral surface of the tip of a rotor drive shaft fitting boss protruding from a casing forming a pump chamber. Since the sealing O-ring was installed in the mounting groove, no liquid pool was formed between the rotor drive shaft fitting boss inner peripheral surface on the projecting end side and the rotor. There is no danger of it getting lost.

Further, when replacing the O-ring for sealing, it is only necessary to remove the casing cover, pull out the rotor lock nut, and remove the rotor. Therefore, the replacement work of the O-ring is very easy and easy.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary pump according to the present invention.

FIG. 2 is a front view of a conventional rotary pump with a casing cover removed.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Pump Casing 2 Casing Body 3 Pump Chamber 4 Suction Port 5 Discharge Port 6 Pump Teeth 7A Rotor 7B Rotor 8A Rotor Drive Shaft 8B Rotor Drive Shaft 9 Rotor Lock Nut 10 Casing Cover 11A Rotor Drive Shaft Fitting Boss 11B Rotor Drive Shaft Fitting boss 14 O-ring for sealing 16 Sleeve 17 Ring mounting groove

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[Procedure amendment]

[Submission date] February 4, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Scope of utility model registration request] 1. A ring mounting groove having an L-shaped cross section is circumferentially provided on an inner peripheral surface of a distal end portion of a rotor drive shaft fitting boss projecting integrally with a casing main body forming a pump chamber, and the L-shaped ring mounting groove is formed in the L-shaped ring mounting groove. A rotary pump configured to seal a gap between the boss and a rotor fixed to a rotor drive shaft fitted into the boss by the attached O-ring.