JP2579778Y2 - Magnet driven sealed blower - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hermetic type blower requiring strict sealing (for example, a blower for transporting a highly corrosive fluid or a fluid requiring non-contact with air such as hydrogen gas). More specifically, the present invention relates to a structure of a pressurizing / pumping section (a section for pumping a fluid).

[0002]

2. Description of the Related Art Conventionally, when a fluid requiring non-contact with air, such as a highly corrosive fluid or hydrogen gas, is conveyed under pressure, a pressurizing and pressurizing portion of a fluid machine such as a blower for pressurizing the fluid is used. The rotating shaft part is also hermetically sealed to ensure perfect leakage prevention.

[0003] The transmission of power at the rotating shaft portion having the above-mentioned sealed structure employs a so-called magnet drive mechanism in which a driving force is transmitted by magnetic force to an impeller disposed inside which is sealed from the outside. There are also things.

[0004] Explaining with a specific example, a fluid machine (pump) P equipped with such a magnet drive mechanism is shown in FIG.
As shown in FIG. 1, an impeller 1 is rotatably disposed on a fixed shaft 3 in a pressurized and pressure-feeding unit A having a sealed structure.
Drive-side rotating shaft 4 receiving driving force from a motor such as an electric motor
It was placed coaxially (linear) with respect to the fixed shaft 3, a magnet M ₁ as well as disposed on the rotation shaft 4 side of the drive side, in the applied pressure feed unit A so as to face to the magnet M ₁ The magnet M ₂ is disposed on the impeller 1 on the fixed shaft 3, and the impeller 1 in the pressurizing and pumping unit A is separated from the rotating shaft 4 via the casing 2 and the like forming the outer wall of the pressurizing and pressurizing unit A. It is configured to transmit the driving force by magnetic force.

[0005]

However, in the case of the above structure, the impeller 1 on which the reaction force of _the fluid to be pressurized _{, its} own weight, and the associated centrifugal force, etc., acts on its base end side (rotating). Since the fixed shaft 3 is cantilevered by the casing 2 on the side (closer to the shaft), the casing 2 must be made thicker in terms of strength. At present, the size of the fluid machine is limited by the thickness of the casing 2.

For this reason, in the case of a blower of a fluid machine that is larger than a pump, the above-described configuration cannot be achieved.

[0007] Although not shown, generally, as a method of increasing the size of the fluid machine, in order to reduce the load or the like from the impeller acting on the casing, a fixing base is attached to a suction pipe connected to a suction port of the fluid machine. To provide a two-sided support structure in which one end of the fixed shaft is supported on the fixed base and the other end is supported on the casing. In this case, the fixed base provided on the suction pipe is extra. In addition to this, a fluid flow resistance is generated, and a centering for a fixed shaft is required at the time of assembling between the fluid machine and the suction pipe, which is separate from the fluid machine. There were problems such as complexity. In particular, there is a marked difference in the strictness of the dimensional accuracy of the assembly including the centering of the fixed shaft in the case where smooth assembly and rotation are required to be simply performed when the flow path is simply formed.

Further, in any of the above-mentioned fluid machines, the fixed shaft 3 and the rotating shaft 4 must be accurately coaxially arranged. In this case, strict dimensional accuracy of the arrangement between the two shafts is required. And the need to assemble each bearing part complicates the structure, increases the number of parts and assembling man-hours, increases the manufacturing cost, and makes maintenance difficult. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to provide a magnet-driven hermetic blower which is suitable for a blower generally larger than a fluid machine such as a pump and has no technical problem. To the purpose.

[0010]

According to the present invention, there is provided a magnet-driven hermetic type blower in which a driving magnet and a driven magnet are disposed to face each other with a sealing casing interposed therebetween, and the blade having the driven magnet is provided. In a magnet-driven hermetic blower in which a pressurizing and pressure-feeding section that sucks and feeds a fluid by rotation of a car has a sealed structure, a through-hole is formed in a casing that forms an outer wall of the pressurizing and pressure-feeding section. both ends by penetrating the fixed shaft so as to protrude on both sides across the casing as well as遊装, a sealing member interposed between the casing and the fixed shaft so as to be sealingly in the through portion, and, the fixed Cantilevered end of shaft outside casing
Lifting and, further, the free end of the casing inside the fixed shaft
A centrifugal impeller is rotatably arranged, and is rotated on a fixed shaft outside the casing by drive from the prime mover.
The rotating body to be rotated is rotatably mounted, a driving magnet and a driven magnet are provided on the rotating body side, and the end of the fixed shaft on the rotating body side is fixed to the machine base side. It is characterized by having been established.

[0011]

The magnet-driven hermetic blower having such a configuration has the following functions and effects.

(1) Since the fixed shaft can be made to have a large diameter, and the fixed shaft is strongly supported in a cantilever manner at one end on the outside of the pressurizing / feeding section by a rigid portion such as a machine base. The load from the impeller mounted on the distal end side (inside of the casing) of the fixed shaft and the rotating body on the base end side (outside of the casing) is transmitted and absorbed exclusively to the machine base via the fixed shaft. become.

(2) As described above, even if the fixed shaft is of a cantilever type, the fixed shaft can be constituted by a single highly rigid shaft (including an integral shaft). The body can be supported in a sufficiently strong state outside the pressurizing / feeding unit, and in the through-hole portion of the casing through which the fixed shaft passes, the fixed shaft is loosely fitted to the through-hole of the casing,
Since the seal member is disposed between them to form a sealed structure, the load from the impeller and the rotating body is not transmitted to the casing, and as a result, even if the blower is enlarged, The casing only needs to withstand the internal pressure of the fluid, and the thickness of the casing can be reduced as much as possible.

(3) As described above, since the thickness of the casing can be reduced, the permeability of magnetic force can be improved, and the distance between the driving magnet and the driven magnet can be reduced. Power can be transmitted efficiently to the vehicle.

(4) Also, it is possible to increase the size of the blower,
Moreover, unlike the conventional double-supported support structure, no extra increase in fluid resistance occurs and the structure is not complicated.

(5) In addition, since relative rotation is not performed in the through-hole portion of the casing through which the fixed shaft passes, even if the seal member is interposed with a detachable structure using bolts or the like. In addition, the seal member does not wear or fatigue due to repeated load or the like. Further, a welding structure, an adhesive structure, or the like can be employed.

(6) Also, since the structure is simple, the number of parts is small, and unlike the conventional case, two shafts are accurately arranged coaxially without onerous adjustment. The driving magnet and the driven magnet can be easily and quickly disposed on the fixed shaft.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing the configuration of a main part of a magnet drive mechanism (a magnet drive mechanism and a sealing structure of a drive side of the magnet drive mechanism) of the magnet drive sealed type blower according to the present embodiment. In the following description, the same reference numerals are used for members having the same or equivalent functions as those of the above-described conventional example.

In FIG. 1, reference numeral 1 denotes an impeller, and 2 denotes a casing which seals the impeller 1 and forms an outer wall of the pressurizing / feeding section A. The impeller 1 is rotatably attached to the leading end of a fixed shaft 3 that does not rotate via a slide bearing 5.
As shown in FIG. 1, the fixed shaft 3 is loosely inserted through a through hole 2a formed at the center of the casing 2 at the center thereof, and has a flange (flange) provided on the fixed shaft 3. A portion 3a is attached to a wall surface around the through hole 2a by a bolt 6 so as to abut via a seal member (gasket) 7. Thus, the flange 3a and the casing 2
The liquid inside the casing (existing on the left side of the casing 2 in the figure) does not leak and the impeller 1
Is not transmitted directly to the casing 2.

The fixed shaft 3 is attached to a support block 8 integrally attached to the machine base F on the right end side in the drawing.
It is firmly fixed in a cantilevered manner without rotating.

A rotating body 9 having a pulley groove 9a formed therearound is rotatably mounted via a rolling bearing 10 between the casing 2 of the fixed shaft 3 and the support block 8.

Further, a side portion of the rotating body 9 of the casing 2 is formed in a cylindrical convex shape on the rotating body 9 side, and a cylindrical recessed cylindrical body 9A is formed at a corresponding portion of the rotating body 9 at the corresponding portion. It is configured to extend and cover the convex portion of the casing 2 from the side. Then, the magnet M ₁ for driving the inner peripheral surface of the tubular member 9A (the casing 2 side) is disposed.

The impeller 1 is provided with a cylindrical convex cylindrical body 1A which is enclosed by the cylindrical body 9A from the side of the impeller 1 with the casing 2 interposed therebetween, and an outer peripheral surface of the cylindrical body 1A. driven magnets M in a state of facing the said drive magnet M ₁ is the
_Two are arranged.

The rotation of the rotating body 9 is configured to be transmitted by a prime mover (not shown) via transmission means such as a belt and gears (not shown).

Thus, the machine constructed as described above operates as follows.

That is, when rotation is given to the rotating body 9 from a motor (not shown), the cylindrical body 9A extending on the casing 2 side also rotates, so that the cylindrical body 9A is attached to the inner peripheral surface of the cylindrical body 9A. impeller 1 is rotated by the magnet M ₁ being induces the magnet M ₂ of the impeller 1 side by magnetic force.

In this case, in the apparatus according to the present invention, as shown in FIG. 1, the fixed shaft 3 is supported by the support block 8 in a sufficiently strong cantilever manner. Since there is a gap between the fixed shaft 3 and the casing, the seal member 7 is interposed between the fixed shaft 3 and the casing, so that the casing 2 has no weight such as the impeller 1 or the rotating body 9 or the fluid resistance acting on them. , Drive resistance and the like do not act.

Therefore, the thickness of the casing 2 can be made extremely thin as compared with the conventional apparatus shown in FIG.

As described above, when the thickness of the casing is reduced, the strength of the magnetic force is generally inversely proportional to the square of the distance between the magnets. It is possible to strongly guide the driven magnet inside.

Further, since the fixed shaft 3 is fixed and the fixed shaft 3 and the casing 2 do not move relatively, the seal member interposed therebetween does not wear. This effect is a great advantage in terms of reliability in such machines where sealing is a requirement.

With this configuration, unlike the conventional device, the impeller and the rotating body are supported by only one fixed shaft, so that the dimensional accuracy at the time of rotation is easily obtained, and the assembly or the assembly is easily performed. Can be overhauled.

Further, since the number of parts is also reduced, the manufacturing cost can be greatly reduced in combination with the reduction in the number of assembling steps, and the reliability of the apparatus is improved with the reduction in the number of parts.

In the above embodiment, the support block 8 has a structure that can be divided in the height direction so that the worn V-belt can be easily replaced. That is, the support block is disassembled in the height direction, and the space formed therebetween is replaced by a V-belt.

In the above embodiment, the driving magnet and the driven magnet are arranged inward and outward of the rotating circumference. However, as shown in FIG. It may be provided.

In the above embodiment, when the blower is used for pumping a corrosive fluid, the bearing in the pressurizing and pumping section may be a ceramic ball bearing or a ceramic sleeve and a fluoroplastic sliding bearing. It is preferable to use If it is necessary to consider lubrication or prevention of heat generation, the fixed shaft may be made hollow to supply water, lubricant or the like to the inside.

[0037]

Advantageous Effects of the Invention The magnet-driven hermetic type blower according to the present invention is configured as described above and produces the above-described effects, and therefore has the following effects.

(1) A larger transmission force can be transmitted to the impeller in the casing as compared with the conventional one.

Therefore, when obtaining the same transmission force as that of the conventional structure, the amount of magnets can be reduced.

In the case of designing the same external volume,
Since the magnetic force can be increased, even if the rotation has been reduced due to the overload in the past, the apparatus can be rotated without reduction.

(2) Also, since only one shaft is needed to support the impeller and the rotating shaft, the manufacturing cost is reduced and the centering operation is not required, so that the number of assembling steps is reduced. In addition, even if not a skilled worker, assembly or overhaul can be easily performed while maintaining high accuracy.

(3) Since the structure is simplified, failures and the like are reduced, reliability is improved, and the weight can be reduced in combination with the fact that the casing can be made thinner.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing a configuration of a main part of a magnet drive mechanism of a magnet-driven sealed fluid machine according to an embodiment.

FIG. 2 is a partial side sectional view of a main part showing another embodiment.

FIG. 3 is a side sectional view showing a structure of a magnet driving mechanism of a conventional magnet driven sealing type fluid machine.

[Explanation of symbols]

1 ... impeller 2 ... casing 2a ... through hole 3 ... fixed shaft 9 ... rotating body A ... applied pressure feed unit M ₁ ... driving magnet M ₂ ... driven magnet.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-73088 (JP, A) JP-A-58-32194 (JP, U) JP-A-59-191641 (JP, U) JP-A-59-191641 119999 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A pressurizing and pumping unit for arranging a driving magnet and a driven magnet opposed to each other with a sealing casing therebetween, and sucking and pumping fluid by rotation of an impeller provided with the driven magnet. In a sealed magnet-driven blower having a closed structure, a through hole is formed in a casing forming an outer wall of the pressurizing and pressure-feeding unit, and a fixed shaft is penetrated through the through hole so that both ends protrude to both sides across the casing. And a sealing member is interposed between the casing and the fixed shaft so as to be hermetically sealed at the penetrating portion, and the end of the fixed shaft outside the casing is cantilevered.
And, further, a centrifugal type to the free end of the casing inside the fixed shaft
With disposing the impeller rotatably, on the outside of the stationary shaft of the casing, it is rotated by the drive from the prime mover
And attached rotatably to the rotating body to be, a driving magnet on the rotor side, respectively disposed the driven magnet on the impeller side to and fixed the end of the rotating body side of the fixed shaft to the machine frame side A magnet-driven sealed blower characterized by the following.