JPH07103869B2 - Safety lock mechanism of magnet pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a safety lock mechanism of a magnet pump.

[Conventional technology]

Conventionally, a synthetic resin or the like, which is relatively inexpensive and has strong chemical resistance, is often used as a pump for feeding a liquid such as a chemical (hereinafter, simply referred to as a chemical). However, since the chemical is handled, the seal between the shaft and the casing is required to be perfect. That is, the drug solution itself is often expensive, or is often dangerous to the human body. Therefore, as a pump that satisfies these requirements, a magnet pump is known that has no shaft seal portion between the shaft and the casing in order to prevent the chemical liquid from leaking.

The magnet pump 1b has a structure as shown in FIG. That is, there is a shaft 6 housed and fixed in the casing 3, and an impeller 8 is rotatably attached to the shaft 6. A magnet capsule (rotor) 10 is attached to the impeller 8, and the magnet capsule 10 houses a driven magnet 9a that transmits the rotation of the motor to rotate the impeller 8. In addition, in order to rotate the magnet capsule 10, the casing 3
The drive magnet 9b provided in the vicinity of is provided in the rotating body 11 attached to the rotating shaft 29 of the motor.
Therefore, in such a magnet pump 1b, since the shaft seal portion is not provided, during normal operation, the chemical liquid entered through the suction port 20 is discharged through the discharge port 21, and there is no concern that the chemical liquid leaks from other parts.

Further, in this magnet pump 1b, even if there is the shaft 6 as the center of rotation for holding the rotation of the impeller 8, the frictional heat due to the sliding between the shaft 6 and the rotary bearing 7 is cooled by the chemical liquid during normal operation. Drive without problems.

[Problems to be Solved by the Invention]

However, the above-described magnet pump 1b is
Under unstable conditions such as cavitation operation, deadline operation, semi-empty operation (when priming is insufficient), airlock operation, overfeeding, unstable liquid transfer due to prerotation effect (hereinafter simply referred to as idle operation) When operating, the above-mentioned frictional heat is generated, and heat is accumulated in the bearing holding portions of the casing 3, the rotary bearing 7, and the magnet capsule 10 with time, and these become high in temperature, so that the space between the rotary bearing 7 and the magnet capsule 10 is increased. It loosens in a short time, and the impeller 8 and the magnet capsule 10 are shaken by rotation and come into contact with the casing 3 to make contact marks, cracks, or deformation. Further, the friction caused by the sliding movement of the shaft 6 and the rotary bearing 7 causes the magnet capsule 10 and the impeller 8 to rotate and come into contact with the casing 3.

In particular, in the conventional magnet pump 1b, the impeller 8 or the magnet capsule 10 is often made of a heat-sensitive material such as synthetic resin, and the thickness of the casing 3 is thinned in order to increase the rotational force of the magnet capsule 10. Then
There is a slight gap between the casing 3 and the magnet capsule 10. As a result, in the magnet pump 1b, the magnet capsule 10 or the impeller 8 and the casing 3 come into contact with each other due to thermal deformation, wear, etc., and the casing 3 is cracked, and a large amount of the chemical liquid inside leaks, so that the magnet pump 1b is judged to be out of order. Was common sense. Therefore, the conventional magnet pump 1b does not know at all from the outside until a large amount of liquid leaks and a failure is discovered, and once the liquid leaks, the pump cannot be replaced and the facility line cannot be restored. Under such circumstances, the conventional magnet pump 1b is destined to have a sudden leakage of the chemical liquid due to a large amount of wear during continuous operation, which is common sense. For this reason, this magnet pump 1b
Was an unstable pump because it was impossible to know when a large amount of liquid would leak during continuous operation.

Therefore, the present invention has been made in view of the above circumstances,
Even though it has high chemical resistance such as acid resistance and alkali resistance, even if the rotor and impeller rotate due to thermal deformation caused by friction heat due to idle operation or abrasion due to rotary sliding, It is an object of the present invention to provide a safety lock mechanism for a magnet pump, which stops rotation before contacting the casing, protects the magnet pump itself, and prevents the chemical liquid from flowing outside.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the safety lock mechanism of the magnet pump of the present invention is configured so that the rotor is rotatably attached to the shaft housed and fixed in the casing and the impeller is fixed to the rotor to rotate the impeller. A magnet pump configured, wherein a safety lock part for stopping rotation of the rotor is provided between the rotor and / or the impeller and the casing, and the safety lock part is a bush provided in the casing. And a protrusion provided on the rotor and / or the impeller so as to be rotatable in the groove of the bush with a predetermined gap amount, and the rotational shake of the rotor and the impeller reaches the gap amount. Rotation, the rotation of the rotor is stopped by the contact between the bush of the safety lock part and the protrusion. A magnet pump configured to fix a rotor and an impeller to a shaft that is housed in a casing and rotatably attached, and configured to rotate the impeller, the rotor and / or the A safety lock part for stopping the rotation of the rotor is provided on the impeller and the casing, and the safety lock part is rotatable with a bush provided on the casing and a groove of the bush with a predetermined gap amount. The rotor and / or the projection provided on the impeller, and when the rotational shake of the rotor and the impeller reaches the gap amount, the rotation of the rotor is prevented by rotating the bush of the safety lock portion and the projection. It is stopped by contact with.

[Operation] According to the safety lock mechanism of the magnet pump configured as described above, the rotor is rotatably attached to the shaft housed and fixed in the casing, and the impeller is fixed to the rotor to rotate the impeller. In such a magnet pump, due to thermal deformation, wear, etc., rotation blur of the rotor and impeller occurs, and when this rotation blur reaches the gap amount of the safety lock part, the bush and the protrusion come into contact with each other. The safety lock part locks to stop the rotation of the rotor, and the rotor and impeller do not come into contact with the casing.

Further, in a magnet pump configured to rotate a rotor and an impeller by fixing the rotor and the impeller to a shaft housed in a casing and rotatably attached, the rotor and the impeller may be damaged due to thermal deformation, wear, etc. When the rotation shake reaches the gap amount of the safety lock part and the bush and the projection come into contact with each other, the safety lock part locks and the rotation of the rotor is stopped, and the rotor and the impeller are attached to the casing. Do not touch.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a vertical sectional view of a magnet pump having a safety lock mechanism of the present invention. In FIG. 1, reference numeral 1 denotes a magnet pump, which includes a housing 2, a casing 3 housed in the housing 2, and a rear and front fixed guides 4 and 5 housed in the casing 3. And a shaft 6 fixed via the shaft 6.
An impeller 8 rotatably attached via a rotary bearing 7, a rotary guide 40 fitted to the outer periphery of the rotary bearing 7 and a magnet capsule (rotor) 10, and the impeller 8
Safety lock part provided between the casing and the casing 3.
30 and a magnet capsule 10 that houses the driven magnet 9a and fixes the impeller 8 and a drive magnet 9b that is outside the casing 3 and that rotates the impeller 8 together with the driven magnet 9a of the magnet capsule 10. And a drive unit 12 formed of a rotating body 11 that accommodates the

The housing 2 is divided into a motor bracket 13, a suction flange 14 and a discharge flange 15 so that the casing 3 can be housed and held, and can be fixed by bolts or the like. As the material does not come into direct contact with the chemical solution,
Strength is more important than chemical resistance, and castings are usually used.

The casing 3 is made of a material selected in consideration of chemical resistance, and is usually made of synthetic resin such as polypropylene or fluororesin and is divided into a rear casing 16 and a front casing 17. Since the rear and front casings 16 and 17 are firmly adhered to each other via the sealing material 19 to form the casing 3, there is no liquid leakage. The front casing 17 is provided with a suction port 20 and a discharge port 21, respectively. On the other hand, in the rear and front casings 16 and 17,
Fixed grooves 16a and 17a are formed respectively, and a rear fixed guide 4 and a front fixed guide 5 are fixed to these fixed grooves 16a and 17a, respectively. Heat conduction cut-off grooves 4a and 5a are formed in the rear and front fixed guides 4 and 5, respectively. These heat conduction blocking grooves 4a and 5a are formed on the shaft 6
The friction heat generated by the friction between the rotary bearing 7 and the rotary bearing 7 and the friction between the rotary bearing 7 and the below-mentioned front thrust pad 22 is blocked so that the friction heat is not transmitted to the rear casing 16 and the front casing 17. It is provided. The front fixed guide 5 is provided with a liquid guide passage 5b and a heat dissipation hole 5c.

Both ends of the shaft 6 are fixed to the rear and front fixed guides 4 and 5, and the impeller 8 and the driven magnet 9a.
The magnetic capsule 10 that accommodates and is provided with a center of rotation, and is made of a hard and chemically resistant material such as alumina ceramics. The shaft 6 has an impeller 8 and a magnet capsule 10 attached thereto.
Are rotatably attached via the rotary bearing 7 and the rotary guide 40. Further, the front thrust pad 22 and the rear thrust pad 41 are fixed to both sides of the rotary bearing 7 in the axial direction in order to support the thrust load of the impeller 8 and the magnet capsule 10. The front and rear thrust pads 22 and 41 are made of ceramics, and the load in the thrust direction of the front and rear thrust pads 22 and 41 is reduced by the buffer member 42.
And 43, and is received by the front and rear fixed guides 5 and 4. In addition, this cushioning member
42 and 43 are made of shock absorbing material such as rubber.

The rotary bearing 7 is formed in a cylindrical shape with a collar, is attached so as to be rotatable with respect to the shaft 6, and rotates together with the impeller 8 and the magnet capsule 10. In the cylindrical portion of the rotary bearing 7, a heat conduction cut-off groove 25 having a substantially concentric shape is formed in the axial direction. The rotary guide 40 fitted on the outer peripheral surface of the rotary bearing 7 is provided with a heat conduction cut-off groove 40a which is substantially concentric in the axial direction like the rotary bearing 7. The rotary bearing 7 and the rotary guide 40 have a double structure such as a mahobin due to the principle of Mahybin, that is, the heat conduction blocking grooves 25 and 40a.
The frictional heat is prevented from being conducted to the casing 3, the impeller 8 and the magnet capsule 10 by the air layer having a low thermal conductivity in 40 and 40a.
Further, as the heat conduction blocking grooves 25, 40a rotate, the air is stirred, and the frictional heat reaching the surfaces of the heat conduction blocking grooves 25, 40a is dissipated. Since the rotary guide 40 is a separate body from the rotary bearing 7, it is not limited to the material required for the bearing, and it is possible to freely select a material having high heat resistance and heat insulation performance.

The impeller 8 is of a non-clock type, and the material thereof is used with due consideration of chemical resistance and strength, and synthetic resin such as polypropylene or fluororesin is usually adopted.

The safety lock part 30 includes a main lock part 31 and an auxiliary lock part 32. The main lock portion 31 is pushed into the ring-shaped groove 17b provided in the front casing 17 by the main push 33.
Is detachably fitted, and the impeller 8 is rotatably provided in the ring groove 35 of the main bush 33. The ring groove 35 of the main bush 33 and the projection 34 are mainly in contact with each other to lock the pump. is there. On the other hand, the auxiliary lock portion 32 is provided in the L groove 17c provided in the front casing 17 with the auxiliary bush 36.
The auxiliary bush 36 and the tip projection (protrusion) 8a of the impeller 8 come into auxiliary contact with each other to lock the pump.

The main lock portion 31 and the auxiliary lock portion 32 have abnormal wear due to sliding between the shaft 6 and the rotary bearing 7, thermal deformation of the rear and front guides 4 and 5 for holding the shaft 6 due to idling, and the rotary bearing 7. Due to the thermal deformation of the rotating guide 40 to be held, a rotational shake α of the magnet capsule 10 and the impeller 8 is generated, and this rotational shake α is a predetermined gap amount (γ, which will be described later,
When δ) is reached, the magnet capsule is placed in the casing 3.
The pump is locked before the impeller 10 and the impeller 8 come into contact with each other. That is, in the main lock portion 31, the magnet capsule 10 and the rotation pre-α _{1 of the} impeller 8 have the casing 3
When a predetermined gap amount γ smaller than the minimum gap amount β between the inner wall surface of the magnet capsule 10 and the magnet capsule 10 and the impeller 8 is reached, the pump is locked (α ₁
= Γ <β).

In the auxiliary lock portion 32, the rotational shake α ₂ of the magnet capsule 10 and the impeller 8 has reached a predetermined gap amount γ smaller than the minimum gap amount β between the inner wall surface of the casing 3 and the magnet capsule 10 and the impeller 8. However, when the main lock portion 31 does not act and the predetermined gap amount δ is reached, the pump is supplementarily locked (α ₁ = γ <α
₂ = δ <β).

The main push 33 of the main lock portion 31 and the auxiliary bush 36 of the auxiliary lock portion 32 are made of a wear-resistant material and can be replaced when they are worn for a certain amount or more. Further, the safety lock part 30 is not limited to the installation place of the present embodiment, and may be another position.

The drive unit 12 including the magnet capsule 10 and the rotating body 11 is for rotating the impeller 8,
The rotating body 11 of the drive unit 12 is connected to the shaft 29 of the motor 28 supported by the motor bracket 13. Therefore, when the rotating shaft 29 of the motor 28 rotates, the drive magnet 9b housed in the rotating body 11 of the drive unit 12 rotates. Since the driven magnet 9a rotates along with the drive magnet 9b, the magnet capsule 10 rotates and the impeller 8 also rotates. For this reason, in order to increase the rotational force of the magnet capsule 10, it is necessary to increase the magnetic force between the drive magnet 9b and the driven magnet 9a, so that the space between them is formed as narrow as possible. That is,
The gap amount β between the inner wall surface of the rear casing 16 and the outer peripheral surface of the magnet capsule 10 is about several m / m.

Next, a usage state of the safety lock mechanism of the magnet pump 1 having the above configuration will be described.

In the magnet pump 1, the casing 3 is normally filled with the chemical liquid. Therefore, the chemical liquid or the like enters the casing 3 through the suction port 20, is given a predetermined pressure by the impeller 8, and is discharged from the discharge port 21. At this time, both ends of the shaft 6 are fixed to the casing 3 via rear and front fixing guides 4 and 5, and the front and rear thrust pads 22 and 41 are connected to the front via cushioning members 42 and 43. And is supported by rear fixed guides 5 and 4. And the impeller 8 and the magnet capsule 10
Rotates on the shaft 6 via the rotation guide 40 and the fixed bearing 7, the impeller 8 obtains thrust on the front side,
The rotary bearing 7 rotates in a sliding state on the shaft 6 and the front thrust pad 22, and wear and frictional heat are generated between them. However, in the normal operation as described above, since the casing 3 is filled with the chemical liquid or the like, the frictional heat is cooled by the chemical liquid or the like, and there is no particular adverse effect due to the frictional heat. Front thrust pad
Since 22 is worn regardless of the presence or absence of a chemical solution, the impeller 8 and the magnet capsule 10 are rotationally shaken over time. Furthermore, when the casing 3 is not filled with the chemical liquid or the like due to an accident or a power failure, that is, in the case of idle operation, there is no chemical liquid as the cooling water, and there is no thrust to the front side as described above. Friction heat is generated only in the sliding portion A between the rotary shaft 6 and the rotary bearing 7, and the temperature becomes high. In this state, the rear and front fixed guides 4 and 5 and the rotary guide 40 also become hot and thermally expand, and the rear and front fixed guides 4 are rotated with respect to the shaft 6 and the rotary bearing 7, which have a smaller thermal expansion than these guides. And 5, the rotation guide 40 becomes loose, and the impeller 8
Also, the magnet capsule 10 causes rotational shake. Impeller 8 and magnet capsule due to the above-mentioned wear and friction heat
When the rotational shake α of 10 becomes α ₁ , the predetermined gap amount γ is reached, so that the main lock portion 31 of the safety lock portion 30 operates. That is, the ring groove 35 of the main bush 33 provided on the front casing 17 and the projection 34 of the impeller 8 come into contact with each other to lock the pump. Furthermore, if the main lock portion 31 does not act for some reason and the rotational shake α of the impeller 8 and the magnet capsule 10 reaches α ₂ , a predetermined gap amount δ is reached, so that the auxiliary lock 32 operates. That is, the auxiliary bush 36 provided in the front casing 17
And the tip projection 8a of the impeller 8 come into contact with each other to lock the pump. Therefore, the impeller 8 and the magnet capsule 10 come into contact with the casing 3 to cause a crack in the casing 3, and it is possible to detect a failure of the magnet pump 1 before the chemical liquid flows out.

The high-temperature frictional heat generated in the sliding portion A mainly tries to be conducted to the impeller 8 and the magnet capsule 10 via the rotary bearing 7 and the rotary guide 40, but mainly the heat conduction cut groove of the rotary bearing 7. 25, the conduction of frictional heat is almost cut off by the heat conduction blocking groove 40a of the rotation guide 40 by the Mahobin principle. That is, the high-temperature frictional heat that has reached the surfaces of the heat conduction blocking grooves 25, 40a is converted from conduction to convection, and the heat conduction blocking grooves 25, 40a agitate the air by rotation, so that the heat conduction blocking is performed. The high-temperature frictional heat on the surfaces of the grooves 25, 40a is cooled by air. In addition, since the rotation guide 40 is a separate body and a material having a high heat shielding effect can be freely selected, frictional heat can be efficiently shielded.

Further, the high-temperature frictional heat generated in the sliding portion A is mainly caused by the shaft 6,
The heat is transmitted to the rear and front fixed guides 4 and 5, the rear and front casings 16 and 17, respectively, but mainly the heat conduction cutoff groove of the shaft 6, the heat conduction cutoff groove 5a of the rear and front fixed guides 4 and 5, and the waveguide. Conduction is substantially blocked by the passage 5b, the heat dissipation hole 5c, and the buffer member 42.

Therefore, the high-temperature frictional heat generated in the sliding portion A is scarcely conducted to the impeller 8, the magnet capsule 10 and the rear and front casings 16 and 17, and they are not deformed by the high-temperature frictional heat. .

FIG. 3 shows a safety lock mechanism of a magnet pump according to another embodiment of the present invention. In the embodiment shown in FIGS. 1 and 2, the shaft 6 is fixed to the casing 3, and the impeller 8 and the magnet capsule 10 rotate on the shaft 6, while the shaft 6 has the impeller 8 and the magnet. The capsule 10 is fixed, and the shaft 6 is placed on the casing 3.
Is something that rotates. The differences are as follows. That is, the rear side of the shaft 6 of the magnet pump 1a is rotatably attached to the rear casing 16 via the rear fixed bearing 50, and the front side of the shaft 6 is rotatably attached to the split plate 54 via the front fixed bearing 52. The impeller 8 and the magnet capsule 10 are fixed to each other via the rotation guide 55. Further, a thrust receiving ring 56 is attached to the front casing 17, and the thrust receiving ring 56 is attached.
The mouse ring 57 is attached to the impeller 8 while sliding on the. And the safety lock part 60 of the present invention
Is composed of a main lock portion 61 and an auxiliary lock portion 62. In this main lock portion 61, a main bush 63 is detachably fitted in a ring-shaped recessed groove 17b provided in the front casing 17, and a projection 64 is provided on the impeller 8 rotatably in a ring groove 65 of the main bush 63. The ring groove 65 of the main bush 63 and the protrusion 64 mainly contact with each other to lock the pump.
On the other hand, in the auxiliary lock portion 62, the auxiliary bush 66 is detachably fitted in the L-shaped groove 54a provided in the split plate 54, and the auxiliary bush 66 and the base end projection (projection) 8b of the impeller 8 are auxiliary. The pump is locked by touching.

Further, in the rear fixed bearing 50, the front fixed bearing 52, the split plate 54, the rotation guide 55, the thrust receiving ring 56 and the mouth ring 57, the heat conduction blocking grooves 50a, 52a, 54a, 55a,
56a and 57a are engraved respectively.

Therefore, the impeller 8 and the magnet capsule 10 come into contact with the casing 3 to cause a crack in the casing 3, and it is possible to detect a failure of the magnet pump 1a before the chemical liquid flows out.

Further, in the magnet pump 1a, frictional heat is generated between the thrust receiving ring 56 and the mouth ring 57, between the shaft 6 and the front fixed bearing 52, and between the shaft 6 and the rear fixed bearing 50 during idling. However, both are heat conduction blocking grooves 50a, 5
2a, 54a, 55a, 56a and 57a make it difficult to conduct heat due to the Mahobbin principle and heat dissipation due to the rotation of the impeller 8, and the rear and front casings 16 and 17, the split plate 54, the magnet capsule 10 and the impeller 8 are not thermally deformed. . Other structures and operations are substantially the same as those of the embodiment shown in FIGS. 1 and 2, and therefore, reference numerals are attached to the drawings and detailed description thereof will be omitted.

〔The invention's effect〕

As described above in detail, according to the safety lock mechanism of the magnet pump of the present invention, the rotor is rotatably attached to the shaft housed and fixed in the casing, and the impeller is fixed to the rotor to rotate the impeller. In the magnet pump configured as described above, due to thermal deformation due to frictional heat, wear, etc., rotational shake of the rotor and impeller occurs, and when this rotary shake reaches the gap amount of the safety lock part, the bush and projection The safety lock portion locks and the rotation of the rotor is stopped due to the contact with, and the rotor and the impeller do not contact the casing.

Therefore, the present invention prevents the impeller and the magnet capsule from coming into contact with the casing and damaging or cracking even if an unavoidable rotational shake or the like occurs. It has the effect that it does not become unusable.

Also, in a magnet pump configured to fix a rotor and an impeller to a shaft that is housed in a casing and rotatably attached, and to rotate the impeller, the rotor may be deformed due to frictional heat due to thermal deformation or wear. When the rotation shake of the impeller occurs and the rotation shake reaches the gap amount of the safety lock part, the bush and the projection come into contact with each other, and the safety lock part locks to stop the rotation of the rotor and rotate the casing. Do not contact the child and impeller.

Therefore, also in this case, the same effect as described above is obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a magnet pump having a safety lock mechanism according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a vertical sectional view of a magnet pump having a safety lock mechanism, and FIG. 4 is a vertical sectional view showing a conventional example. 1, 1a, 1b ... Magnet pump 3 ... Casing 6 ... Shaft 8 ... Impeller 8a ... Tip projection (projection), 8b ... Base projection (projection), 10
…… Magnet capsule (rotor), 30, 60 …… Safety lock part, 33,63 …… Main bush (bush), 3
4, 64 …… Projection, 35, 65 …… Ring groove (groove), 36, 66…
… Auxiliary bush (bush), α, α ₁ , α ₂ …… Rotary shake, β …… Gap amount, γ, δ …… Predetermined gap amount

Claims (2)

[Claims] 1. A magnet pump comprising a rotor rotatably mounted on a shaft housed and fixed in a casing, an impeller fixed to the rotor, and the impeller rotating. And / or a safety lock portion for stopping the rotation of the rotor is provided between the impeller and the casing, and the safety lock portion has a bush provided in the casing and a predetermined gap amount in the groove of the bush. And a rotatably and / or a projection provided on the impeller. When the rotational shake of the rotor and the impeller reaches the gap amount, the rotation of the rotor is prevented by the safety lock portion. The safety lock mechanism of the magnet pump, wherein the bush is stopped by the contact between the bush and the protrusion. 2. A magnet pump having a rotor and an impeller fixed to a shaft housed in a casing and rotatably attached to the shaft to rotate the impeller.
A safety lock part for stopping the rotation of the rotor is provided on the rotor and / or the impeller and the casing, and the safety lock part is a bush provided on the casing and a predetermined gap amount in the groove of the bush. And a rotatably and / or a projection provided on the impeller, and when the rotational shake of the rotor and the impeller reaches the gap amount, the rotation of the rotor is locked by the safety lock. A safety lock mechanism of a magnet pump, characterized in that the bush is stopped when the bush and the projection of the portion come into contact with each other.