JP2001123981A - Non-seal sanitary pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-seal sanitary pump capable of performing washing without produced liquid residues remaining in a bearing part in washing by means of a stationary washing device. SOLUTION: This non-seal sanitary pump is provided with an impeller driving mechanism having a magnetic coupling having a structure in which a magnet 8 is embedded in the back surface of an open-type pump impeller 22, a magnetic coupling 6 inserted in an output shaft of an electric motor 10 across a partition plate 4a is arranged so that the end surface may be parallel to the back surface of the pump impeller 22, and a magnet 7 is mounted so as to face the magnet 8 embedded in the back surface of the pump impeller 22. A main shaft 16 fixed perpendicularly to the surface is provided on the partition plate 4a, the pump impeller 22 is inserted in the main shaft 16 so as to be rotated on the outer periphery of the main shaft 16 through a radial bearing, a first thrust bearing having a thrust metal 17 is arranged on the tip of the mains shaft 16, and a second thrust bearing having a thrust metal 19 is arranged on the tip of the pump impeller 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-sealed sanitary pump suitable for a food production line and aseptic specifications.

[0002]

2. Description of the Related Art When a food production line is constructed in an aseptic specification, each device is basically implemented in an aseptic specification. It is preferable that the equipment including the liquid transfer pumps used in the production line have no shaft seal.

[0003] In a rotary drive having a seal structure such as a mechanical seal, the production liquid and the outside air are shut off by a seal surface, but it is preferable that the temperature condition can be kept constant when sterilization treatment is performed with high-temperature steam or the like. However, when the temperature is lowered due to the stoppage of the boiler or the like, the outside air enters from the seal portion, so that the mechanical seal is not preferable on the sterilization line. However, as a sanitary pump, a non-sealing type pump is currently not commercially available. The biggest problem with this type of pump is cleaning with a fixed position cleaning device.
It is required that cleaning can be performed without leaving a residue of a production liquid in a cleaning portion.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned point, and has been developed in consideration of the above-mentioned problem. The purpose is to provide.

[0005]

According to a first aspect of the present invention, there is provided a cup having a magnet embedded in the back of an open type pump impeller and inserted into a motor output shaft with a partition plate interposed therebetween. An impeller drive having a magnetic coupling having a structure in which a ring is arranged so that an end surface thereof is parallel to a back surface of the pump impeller, and a magnet is mounted on the surface so as to face a magnet embedded in the back surface of the pump impeller. Has a mechanism,
A main shaft fixed to the partition plate perpendicular to the surface thereof is provided, and the pump impeller is inserted into the main shaft and configured to rotate around the main shaft through a radial bearing, and a first end is provided at a tip of the main shaft. The thrust bearing of the above is arranged.

[0006] The invention described in claim 2 is the invention according to claim 1.
In the non-sealed sanitary pump according to the above item, when the impeller receives a force moving in the main shaft direction and on the opposite side of the magnetic coupling, a second thrust bearing that restricts the movement at the tip of the impeller is arranged. It is characterized by.

[0007] The invention according to claim 3 provides the invention according to claim 1.
Or in the non-sealed sanitary pump according to 2,
At least two or more cleaning holes are provided in a portion to be inserted into the main shaft of the impeller.

[0008] The invention described in claim 4 is the first invention.
Alternatively, in the non-sealed sanitary pump according to 2 or 3, the motor driving the magnetic coupling is a motor driven by an inverter output, and reaches a predetermined rotation speed after a predetermined time elapses at the time of startup and a predetermined time elapses at the time of stop. It is controlled to stop later.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing the configuration of a non-sealed sanitary pump according to the present invention. FIG. 1 is a cross-sectional view showing the entire configuration, FIG. 2 is a plan view of an impeller, and FIG. FIG. 4 is a sectional view of the impeller.

[0010] The non-sealed sanitary pump according to the present invention includes a casing 1, which is provided with a suction port 2 and a discharge port 3. The casing 1 is integrally connected to a coupling housing 4 via a ferrule clamp 5. Coupling housing 4
Is integrally provided with a partition plate (partition plate) 4a. A magnetic coupling 6 is disposed in the coupling housing 4 with the partition plate 4a interposed therebetween, and a magnet 7 is embedded in an end face of the magnetic coupling 6.

In the pump impeller 22, a cylindrical tube 22b is integrally provided at the center of the surface of a circular plate 22a, and a plurality of (eight in the figure) blades 22c are integrally provided on the surface. It is an open impeller configuration provided. The magnetic coupling 6 is provided on the back surface of the plate 22a of the pump impeller 22.
A magnet 8 is embedded so as to correspond to the magnet 7 embedded in the end face of the magnet 8. Further, the cylindrical body 22b of the pump impeller 22
Are formed with a plurality (four in the figure) of cleaning holes 22d.

The coupling housing 4 is supported by a gantry 9, and an electric motor 10 is mounted on the coupling housing 4.
Is installed. The magnetic coupling 6 is keyed to the rotating shaft of the electric motor 10 by a key 12 and further set screws 13.
It is fixed at. An O-ring 14 is interposed between the casing 1 and the coupling housing 4 to seal the inside of the casing 1 from outside air.

The partition plate 4a is provided with a main shaft 16 fixed vertically to the surface thereof, and the main shaft 16 is inserted into the cylinder 22b of the pump impeller. A bearing metal 15 constituting a radial bearing is fixed to the inner wall of the cylindrical body 22b with screws 23.
Rotates around the outer periphery of the main shaft 16. A first thrust bearing including a thrust metal (fixed side) 17 and a thrust metal (rotation side) 18 is disposed at a tip of the main shaft 16. In addition, the back surface of the plate 22a of the pump impeller 22 and the end face of the magnetic coupling 6 are parallel to each other when the main shaft 16 is inserted into and attached to the cylindrical body 22b of the pump impeller 22.

When the pump impeller 22 receives a back pressure due to the production liquid that has entered between the plate 22 a and the partition plate 4 a of the coupling housing 4, the pump impeller 22 is moved in the direction of the main shaft 16 and on the opposite side of the magnetic coupling 6. It moves under the force of movement. In this case, the thrust metal (rotating side) that regulates this movement at the tip of the pump impeller 22 (the tip of the cylindrical body 22b).
A second thrust bearing composed of 19 and a thrust metal (fixed side) 20 is arranged. The second thrust bearing also has an action of restricting the movement of the pump impeller 22 in the direction of the main shaft 16 when the magnetic coupling 6 steps out. The thrust metal 17 is a resin base member 17a.
And is fixed to the tip of the spindle through the

In the non-sealed sanitary pump having the above structure, when the electric motor 10 is started and its rotating shaft 11 rotates, the magnetic coupling 6 rotates and the magnet 7 also rotates.
The rotational force of the electric motor 10 is transmitted to the pump impeller 22 by the magnetic force of the magnets 7 and 8, the pump impeller 22 rotates, and the production liquid sucked from the suction port 2 is discharged from the discharge port 3. At this time, the product liquid that has entered between the bearing metal 15 and the main shaft 16 through the cleaning hole 22d provided in the cylindrical body 22b of the pump impeller 22 is subjected to the centrifugal force of the pump impeller 22 to cause the plate of the pump impeller 22 to rotate. It flows between the body 22a and the partition plate 4a of the coupling housing 4, and the pump impeller 22 receives a back pressure (here, the weight of the impeller 22 acts simultaneously with the back pressure) and moves to the anti-magnetic coupling side. However, this movement is received and regulated by the second thrust bearing as described above.

As described above, the cylinder 2 of the pump impeller 22
By forming a plurality of cleaning holes 22d in 2b,
The cleaning liquid at the time of cleaning by the stationary cleaning apparatus penetrates into the radial bearing and the thrust bearing through the hole 22d, and performs cleaning without leaving a residue of the production liquid in these bearings. That is, the cleaning liquid is supplied into the casing 1 from the suction port 2 and is discharged from the discharge port 3, so that the cleaning is performed without disassembling the pump unit and without leaving the production liquid residue inside the casing 1, especially the bearing unit. be able to.

In the above example, a non-sealable sanitary pump having a vertical structure in which an electric motor is arranged on the pump is shown. However, the present invention is not limited to this, and as shown in FIG.
It goes without saying that the pump and the electric motor 10 may be arranged side by side in the horizontal direction, and a horizontal structure in which the whole is mounted on the gantry 9 may be adopted. In this case, the second thrust bearing composed of the thrust metal (rotating side) 19 and the thrust metal (fixed side) 20 does not receive the thrust force due to the gravity of the pump impeller 22, but is rotated by the rotation of the pump impeller 22. The production liquid flowing between the plate 22a and the partition plate 4a of the coupling housing 4 generates a back pressure corresponding to the lift of the pump. Although a thrust force due to the back pressure is received, when the suction force of the magnetic coupling is exceeded, the axial movement of the pump impeller 22 is restricted by the second thrust bearing.

In the non-sealed sanitary pump having the above structure, the electric motor 10 is started and the rotational force of the electric motor 10 is transmitted to the pump impeller 22 via the magnetic coupling 6, but the pump impeller 22 has inertia and suddenly Motor 1
When the rotation speed of the pump impeller 22 is increased to the rated speed, the rotation speed of the pump impeller 22 cannot follow the rotation speed.
Is out of synchronization. Therefore, as shown in FIG. 5, the motor 10 for driving the sanitary pump P of the present invention via the magnetic coupling 6 is configured to be driven by the output of the inverter 30, and the controller 31 for controlling the output frequency of the inverter 30. Is provided.

As shown in FIG. 6, when the sanitary pump P is started, the output frequency of the inverter 30 is raised to the rated frequency fs over a predetermined time T1, and when stopped, the output frequency is reduced to 0 over a predetermined time T2. Control so that The predetermined times T1 and T2 correspond to the times of the magnetic coupling 6
Is set to be equal to or longer than the time at which the pump impeller 22 of the sanitary pump P can follow the rotation speed of the electric motor 10 without step-out.

[0020]

As described above, according to the present invention, the following excellent effects can be obtained.

According to the first aspect of the present invention, there is provided an impeller drive mechanism having a magnetic coupling, wherein the impeller rotates around the outer periphery of a main shaft vertically mounted on the partition plate. Therefore, it is possible to provide a non-sealed sanitary pump that can wash the inside of the pump casing without decomposing without leaving a residue of the production liquid.

According to the second aspect of the present invention, the second thrust bearing for restricting the movement at the tip of the impeller when the impeller moves in the main shaft direction when the magnetic coupling is out of synchronization is arranged. When the magnetic coupling loses synchronism, the impeller collides with the pump casing, thereby preventing the casing and the impeller from being damaged and destroyed.

According to the third aspect of the present invention, at least two or more cleaning holes are provided in a portion to be inserted into the main shaft of the impeller, so that the cleaning liquid easily penetrates into the bearing during cleaning. Thus, it is possible to remove the product liquid residue in this portion without leaving it.

According to the fourth aspect of the present invention, the motor for driving the magnetic coupling is a motor driven by the output of the inverter. Since the control is performed so as to stop after a lapse of time, there is no possibility that the magnetic coupling may lose synchronism at the time of starting and stopping.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of the overall configuration of a non-sealed sanitary pump according to the present invention.

FIG. 2 is a plan view of an impeller of the non-sealed sanitary pump according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of an impeller of the non-sealed sanitary pump according to the present invention.

FIG. 5 is a diagram showing a configuration of a control drive unit of the non-seal sanitary pump according to the present invention.

FIG. 6 is a diagram showing an example of an output frequency of an inverter of a control drive unit of the non-sealed sanitary pump according to the present invention.

FIG. 7 is a cross-sectional view showing another example of the overall configuration of the non-sealed sanitary pump according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 casing 2 suction port 3 discharge port 4 coupling housing 4 a partition plate 5 ferrule clamp 6 magnetic coupling 7 magnet 8 magnet 9 gantry 10 motor 11 rotation shaft 12 key 13 set screw 14 O-ring 15 bearing metal 16 main shaft 17 thrust metal 18 Thrust metal 19 Thrust metal 20 Thrust metal 22 Pump impeller 22a Plate 22b Cylindrical 22c Blade 22d Cleaning hole 23 Screw 30 Inverter 31 Controller

Claims (4)

[Claims] 1. A coupling in which a magnet is embedded in the back surface of an open type pump impeller and which is inserted into a motor output shaft with a partition plate interposed therebetween such that an end surface thereof is parallel to the back surface of the pump impeller. An impeller drive mechanism having a magnetic coupling having a structure in which a magnet is mounted on the surface of the pump impeller so as to oppose the magnet embedded in the back surface of the pump impeller, and is fixed to the partition plate perpendicularly to the surface. Wherein the pump impeller is inserted into the main shaft, is configured to rotate around the outer periphery of the main shaft via a radial bearing, and a first thrust bearing is disposed at a tip of the main shaft. Non-seal sanitary pump. 2. The non-sealed sanitary pump according to claim 1, wherein when the impeller receives a force moving in the main shaft direction and on the side opposite to the magnetic coupling, the movement is restricted by the tip of the impeller. A non-seal sanitary pump characterized by disposing a second thrust bearing. 3. The non-sealed sanitary pump according to claim 1, wherein at least two or more washing holes are provided in a portion of the impeller inserted into the main shaft. . 4. The non-sealed sanitary pump according to claim 1, wherein the motor driving the magnetic coupling is a motor driven by an inverter output, and a predetermined number of revolutions after a predetermined time elapses at the time of startup. The non-sealing sanitary pump is controlled so as to stop when a predetermined time elapses when it reaches a stop.