JPH0723594Y2 - Rotary pump - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pump suitable for transporting liquid foods, and more particularly to a rotor drive shaft fitting boss integrally projecting from a casing forming a pump chamber, and fitted to this boss. The present invention relates to an improvement of a rotary pump in which a seal member is interposed between a rotor fixed to a rotor drive shaft and a rotor.

[0002]

2. Description of the Related Art A conventional rotary pump of this type is shown in FIG.
5 is a longitudinal sectional view of the rotary pump, and FIG. 5 is an end view of the rotary pump with the casing cover removed, showing that the pump chamber 3 is inside the casing body 2 of the pump casing 1. A suction port 4 and a discharge port 5 communicating with the pump chamber 3 are formed at the upper end and the lower end, respectively, and rotors 7A, 7B having pump teeth 6 are fitted in the pump chamber 3. ing. Each of the rotors 7A and 7B is 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, and fixed by the rotor lock nut 9, and is also attached to the casing body. The casing cover 10 is attached.

The rotor drive shafts 8A and 8B are fitted and inserted into rotor drive shaft fitting bosses 11A and 11B, which are integrally provided in the pump chamber 3 of the casing body 2, so as to fit the rotor drive shafts. A mechanical seal 12 is interposed between the bosses 11A, 11B and the rotors 7A, 7B. That is, 13 is a cemented carbide sealing material such as ceramic attached to the bosses 11A and 11B side, 14 is a carbon sealing material which is constantly pressed against the end surface of the cemented carbide sealing material 13 by the action of a leaf spring 15, and 16 is a plate. A seat 17 of the spring 15 is an O-ring, and the seal material 14, the leaf spring 15 and the seat 16 are integrally rotated when the rotor drive shafts 8A, 8B and the rotors 7A, 7B are rotated. The rotor drive shaft fitting bosses 11A and 11B are provided with a liquid communication hole 18 having a diameter of about 2 to 4 mm at a portion in contact with the high pressure side of the pump chamber 3, and through the communication hole 18. Thus, the high-pressure side of the pump chamber 3 can communicate with the cavity 19 between the inner peripheral surfaces of the bosses 11A and 11B and the mechanical seal 12.

In the rotary pump constructed as described above, the two rotor drive shafts 8A and 8B are synchronously rotated in opposite directions as shown by arrows in FIG. By the function of the tooth portion 6,
The liquid is sucked into the pump chamber 3 from the suction port 4, and
Although pressurized and sent out to the discharge port 5, a part of the pressurized liquid flows into the cavity 19 between the inner peripheral surfaces of the bosses 11A and 11B and the mechanical seal 12 through the communication hole 18. The high-pressure liquid that has flowed into the hollow portion 19 exceeds the projecting ends of the bosses 11A and 11B, and the rotor 7
It flows out to the low pressure side of the pump chamber 3 through the extremely narrow gap 20 formed between A and 7B and the pump casing 1. The liquid thus discharged to the low pressure side of the pump chamber 3 is again pressurized by the pump tooth portion 6 and flows into the cavity portion 19 from the high pressure side of the pump chamber 3 through the communication hole 18, and further the narrow gap. After passing through 20, the water is again discharged to the low pressure side of the pump chamber 3.

Due to the circulation flow of a part of the liquid as described above, there is no possibility that the liquid that has entered the narrow gap 20 between the rotors 7A, 7B and the pump casing 1 will stay as it is, and the rotor drive shaft Insertion boss 1
Cavity 1 between 1A, 11B and mechanical seal 12
9 is maintained at a high pressure to further improve the sealing property of the mechanical seal 12, that is, the airtightness inside the pump casing 1, and the friction generated by the sliding contact between the carbon seal material 14 and the cemented carbide seal material 13. The heat is released by the flowing liquid, and the mechanical seal 12 is lubricated by the liquid.

[0006]

When liquid foods are transported using the conventional rotary pump as described above, even if the foods are liquids or highly viscous liquids, they are simple liquids or viscous liquids. If there is no problem if it is a solid substance such as strawberry crushed in the liquid such as strawberry jam, such liquid will be discharged from the communication hole 18 to the inner circumference of the boss 11A, 11B. flows into the cavity 19 between the surface and the mechanical seal 12, after flowing through the cavity 19 of this, the rotor 7A, 7B and the pump chamber 3 through the low pressure side minute gap 20 between the casing body 2 when flows out to suction inlet 4, strawberry grain like solids having a diameter 1 mm before and mixed in the liquid is, the low-pressure side minute gap 2 between the rotor 7A, and 7B and the casing body 2 The clogged, the gap 20 will be closed, there is a problem that becomes impossible circulating action of some liquid to the low pressure side from the pump chamber 3 the high pressure side as described above.

According to the present invention, when solids having a large particle size such as strawberries are mixed in the transport liquid, the solids having a large particle size are prevented from flowing into the hollow portion, and the rotor and the pump casing are blocked. It is an object of the present invention to provide a rotary pump that can prevent a clogging phenomenon in a small gap on the low pressure side between the pump chamber and the pump chamber and can normally perform the circulating action of a part of the liquid from the high pressure side of the pump chamber to the low pressure side. .

[0008]

In the rotary pump of the present invention, the rotor drive shaft fitting boss is communicated with the tip end surface of the boss over the high pressure side of the pump chamber and the gap between the boss and the seal member. in which the circumferential groove length by forming a shallow liquid circulation groove of long and groove depth.

In the rotary pump of the present invention,
Is the circumferential groove length of the rotor drive shaft fitting boss
The liquid circulation groove with a long groove depth and shallow groove depth
Spanning the low pressure side and the gap between the boss and the seal member
It may be a groove formed so as to communicate with each other.

As described above, the high pressure side of the pump chamber
When forming the liquid circulation groove on the low pressure side,
On the inner peripheral surface of the tip of the
It is preferable to form a planar liquid outflow guide portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Since most of the structure of the rotary pump of the embodiment shown in these drawings is the same as that of the conventional rotary pump shown in FIGS. 4 and 5, only the structure necessary for the present invention will be described. Description of other parts will be omitted. Further, the same members as those in the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals.

In the rotary pump of the present invention, as shown in FIGS. 1 to 3, each rotor drive shaft fitting boss 1 is inserted.
At the front end surfaces of 1A and 11B, the gap portion 19 between the high pressure side of the pump chamber 3 and the bosses 11A and 11B and the seal member 12 is formed.
A liquid circulation groove 21 that communicates with
The liquid circulation groove 21 has a circumferential groove length W of 30 mm and a groove depth T of 0.3 mm. A liquid outflow guide portion 22 is formed at the inner end portion of the liquid circulation groove 21 so as to form an inclined surface and be continuous with the inner peripheral surfaces of the bosses 11A and 11B. Incidentally, the bosses 11A, 1 in which the liquid circulation groove 21 is not formed
1B tip surface part and rotor 7A, 7B which this faces
The gap with the wall surface is a minute gap of 0.1 mm or less.

As described above, a rotary pump in which the liquid circulation groove 21 having a long circumferential groove length and a very shallow groove depth is formed on the tip surface of each rotor drive shaft fitting boss 11A, 11B is used. For example, when transporting a strawberry jam, the rotor drive shafts 8A and 8B are synchronously rotated in opposite directions as indicated by arrows in FIG. As a result, strawberry jam is sucked into the pump chamber 3 from the suction port 4,
It is pressurized and sent to the discharge port 5.

A part of the strawberry jam that has been pressurized flows into the cavity portion 19 between the inner peripheral surfaces of the bosses 11A and 11B and the mechanical seal 12 from the liquid circulation groove 21. At this time, the liquid circulation occurs. Since the groove depth of the working groove 21 is as very small as 0.3 mm as described above, the strawberry which is a solid substance having a particle diameter of about 1 mm among the jam constituents trying to enter the liquid circulating groove 21. Grains are blocked at the inlet of the groove 21, and otherwise the liquid circulation groove 2
1 to reach the cavity 19. In this case, although the groove depth of the liquid circulation groove 21 is very shallow, its width, that is, the length in the circumferential direction is considerably long, so that the jam components other than the strawberry can be used in the conventional jam structure shown in FIGS. 3 and 4. Similar to the case of the large diameter communication hole 18 in the rotary pump, the groove 21 can smoothly pass through. Moreover, this groove 21
Since the liquid outflow guide portion 22 is formed at the inner end of the groove 21 as described above, the jam that has entered the groove 21 is
It is possible to reliably flow into the cavity portion 19 side without being clogged in the inner portion of the cavity.

The high-pressure strawberry jam that has flowed into the hollow portion 19 flows out to the low-pressure side of the pump chamber 3 through an extremely narrow gap 20 formed between the rotors 7A and 7B and the pump casing 1. It The jam thus discharged to the low pressure side of the pump chamber 3 is again pressurized by the pump tooth portion 6 and flows into the cavity portion 19 from the high pressure side of the pump chamber 3 through the liquid circulation groove 21 and the narrowed portion. After passing through the gap 20, it again flows to the low pressure side of the pump chamber 3.

In the rotary pump of the embodiment described above
The liquid circulation groove 21 between the high pressure side of the pump chamber 3 and the rotor.
-Drive shaft fitting bosses 11A, 11B and seal member 12
The boss 11 is connected so as to communicate with the gap portion 19 between them.
Although it is provided on the tip surfaces of A and 11B, it is described above in the liquid.
Smaller than strawberries, such as fibrous solids
In case of transporting the liquid, the liquid circulation groove 21
On the low pressure side of the pump chamber 3 and the rotor drive shaft fitting boss 1
Connected to the gap 19 between 1A, 11B and the seal member 12.
Provided on the tip surfaces of the bosses 11A and 11B so as to pass through
Good.

That is, the tip surfaces of the bosses 11A and 11B are
There was a minute gap between the walls of the rotors 7A and 7B.
Therefore, small amount of fibrous material that entered from the high pressure side of the pump chamber 3
Solid matter may get stuck in the minute gaps,
As described above, the liquid circulation groove 21 is provided on the low pressure side of the pump chamber 3.
By providing the fiber material from the high pressure side of the pump chamber 3, etc.
The solid matter passes through the circulation groove 21 and the low pressure side of the pump chamber 3
Is smoothly leaked to.

[0018]

[Action and Effect of invention] According to the devised, grooves for liquid circulation
The high pressure side of the pump chamber and the boss for inserting the rotor drive shaft and
The above-mentioned button is connected so as to communicate with the gap between the seal members.
In the rotary pump provided on the distal end surface of the scan, when transporting relatively liquid food solids having a large particle is mixed as strawberry jam, the rotation action of the rotor by the driving of the rotor drive shaft, wherein the inlet The liquid food is sucked into the pump chamber, pressurized, and delivered to the discharge port. A part of the pressurized liquid food flows from the liquid circulation groove into the gap between the inner peripheral surface of the rotor drive shaft fitting boss and the mechanical seal. Since the depth is extremely shallow, relatively large solids such as strawberries in the liquid food that is about to enter the liquid circulation groove are blocked from entering at the inlet of the liquid circulation groove, and otherwise the liquid. It passes through the circulation groove and flows into the gap.

In this case, although the depth of the liquid circulation groove is shallow, its width, that is, the length in the circumferential direction, is long, and therefore, except solid matter such as strawberries, it passes through the large-diameter communicating hole in the conventional rotary pump. As in the case, the liquid circulation groove can be smoothly passed. In addition, by forming a liquid outflow guide portion on the inner end of the liquid circulation groove that forms an inclined surface and is continuous with the inner peripheral surface of the boss, the liquid food that has entered the liquid circulation groove is formed into a groove. Contact, such as clogging in the back part
I don't have it.

Therefore, according to the present invention, even when solids having a large particle size such as strawberries are mixed in the transport liquid, the solids are separated between the rotor drive shaft fitting boss and the seal member. Of the liquid from the high pressure side to the low pressure side of the pump chamber to prevent the clogging phenomenon at the low pressure side minute gap between the rotor and the pump casing. It can be done normally.

Further , the liquid circulation groove is provided in the lower part of the pump chamber.
Between the pressure side and the rotor drive shaft fitting boss and seal member
A rod provided on the tip surface of the boss so as to communicate with the gap.
According to the tally pump, smaller than the strawberries in the liquid
For example, transporting liquids containing solid materials such as fibers
If you do, from the high pressure side of the pump chamber
An object is a minute gap between the tip of the boss and the wall of the rotor.
Even if it penetrates into the gap, it will not be clogged there and the low pressure side
Smoothly flows out to the low pressure side of the pump chamber through the circulation groove of
can do.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary pump according to the present invention,
FIG. 3 is a sectional view taken along line AA of FIG. 2.

FIG. 2 is an end view of the rotary pump with a casing cover removed.

FIG. 3 is an explanatory perspective view showing a liquid circulation groove of a rotor drive shaft fitting insertion boss in the above rotary pump.

FIG. 4 is a vertical sectional view of a conventional rotary pump.

FIG. 5 is an end view of a conventional rotary pump with a casing cover removed.

[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 12 Seal member 19 Cavity 20 Narrow gap 21 Liquid circulation groove 22 Liquid outflow guide

Claims (3)

[Scope of utility model registration request] 1. A rotary member having a seal member interposed between a rotor drive shaft fitting boss integrally projecting from a casing forming a pump chamber and a rotor fixed to the rotor drive shaft fitted into the boss. In the pump, a liquid circulation having a long circumferential groove length and a shallow groove depth, which communicates with the front end surface of the boss across the high-pressure side of the pump chamber and the gap between the boss and the seal member. A rotary pump having a groove for use formed therein. 2. A casing integrally forming a pump chamber
The protruding rotor drive shaft fitting boss and the boss
The rotor fixed to the drive shaft is
In the rotary pump with the
On the tip side of the boss and the front side of the low pressure side of the pump chamber
Circumferential groove that communicates with the gap between the seal members
A liquid circulation groove having a long length and a shallow groove depth is formed.
And a rotary pump. 3. The liquid is formed on the inner peripheral surface of the tip of the boss.
Forming an inclined surface liquid outflow guide part that is continuous with the circulation groove
The rotary according to claim 1 or 2, characterized in that
-Pump.