JPH0311192A - Magnet pump - Google Patents

Abstract

PURPOSE:To easily release a locked state in an impeller lock phenomenon by fixing the base end of a stationary shaft in the center of a partition plate, and forming a wave-like circular rib around the fixed portion of the stationary shaft of the partition plate. CONSTITUTION:A nonmagnetic disk-like partition plate 15 is fixed under a casing 1 by a stationary screw 20. A wave-like circular rib 21 is formed around the center where the end of a stationary shaft 8 of the partition plate 15 is fixed. Accordingly, a diaphragm-type spring effect in an axial direction of the stationary shaft 8 is applied to the partition plate 15. When a pump is left in an inoperative state for a long time, a bearing 11 is brought into film contact with a thrust washer 14. In this case, a light impact by a hammer or the like is exerted on the upper end of the stationary shaft 8 in the axial direction so that the stationary shaft 8 is operated in such a manner as to set a clearance (g) at 0. And further, the thrust washer 14 and the bearing 11 are moved in a separating direction so that the movement is transmitted to the partition plate 15. The partition plate 15 exerts vibration on the stationary shaft 8 in the axial direction with reaction, thus securely separating a fixed portion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of application of fringe industry-E] The present invention relates to a magnet-driven pump that is often used for circulating hot water in hot water heaters and baths. This invention relates to a magnet pump which is rotated by performing magnetic suction drive in the thrust direction.

[Conventional technology]

The most important feature of a normal magneto-I pump is that there is no fluid seal at all in the rotating sliding part, so there is almost no fear of liquid leakage from the fluid seal IF part. Therefore, the mechanism that rotates the impeller also has a rotating shaft that rotates on its own axis.A bearing provided on the impeller side is supported on a fixed shaft, and this fixed shaft is connected to the main body casing or the part of the casing. Since it is attached to the partition plate, etc. that makes up the fixed shaft, it is necessary to apply a sealing process only to the fixed part of the fixed shaft to prevent liquid leakage (11). It's easy.

In this way, magnetic pumps are structurally extremely advantageous in terms of leakage prevention measures, and because they have a small number of parts and can be provided at low cost, they are used for hot water circulation in hot water heaters and baths, etc. It is suitably used for various purposes.

Traditionally, this type of magnetic pump has been superior in terms of functionality! ! In order to simplify the structure without overheating, as shown in FIG. When the discharge II (32) is disposed in a part of the main casing (33), the suction port (:l
11) is arranged in the center of the main body casing (33), and with this configuration, the main body casing (33)
This suppresses the occurrence of air pockets inside the engine and prevents the 8-ton cavitane from moving around on the suction side at the time of startup. ]・, When forming a fluid circuit using a hose etc., it is easy to apply initial water head pressure to the suction Ll (31), and the main body casing (33)
Mold side 1. In addition, the molding process was made easier.

[Problem to be solved by the invention]

However, according to such a configuration, the suction port (31) and the discharge port [formerly 32] of the main body casing (33) are in phase 1j.
Since it is arranged in the direction perpendicular to l, the suction [T] (
31) and the discharge D (32) are positioned protruding from the main body casing (33) in different three-dimensional directions, making the entire pump bulky and inconvenient to handle during transportation and storage. When creating the sushi 1 main body casing (33), the direction of mold removal becomes complicated, etc.
Problems also remained with respect to the addition properties.

More importantly, if the impeller is warped for a long period of time when it is not used, there is a problem that the impeller opening may become warped and the impeller will not start up when in use.

In other words, under normal usage conditions, the fixed shaft that supports the impeller and the bearing provided on the impeller side are constantly lubricated by fluid such as water flowing inside the pump, or -μ,
When not in use, the impeller will remain static. Since the attraction force between the magnets provided on the impeller and the drive side urges the rotating sliding contact between the fixed shaft and the bearing to come into close contact, the fluid as a lubricant is applied to the rotating sliding contact. The material surfaces of both materials come into direct contact with each other.

If such a state of close contact between the fixed shaft and the bearing occurs halfway, microorganisms such as bacteria living in water will breed around the rotating contact area and cause the fixed shaft and bearing to stick together. In addition to increasing the frictional force between the two material surfaces, the adhesive action is also taken into account, eventually leading to the impeller lock phenomenon.

Normally, when a valve or other automatically operated movable part of a fluid system undergoes an Iff event, recovery measures are taken by applying a strong force in accordance with the direction of the movement in one motion. However, when the above-mentioned impeller lock phenomenon occurs in a magnetic pump, the magnetic force and the spring come off, causing only the motor and other drive side to idle, a so-called tax adjustment phenomenon.As a result, the pump part must be disassembled and repaired. There was a problem that it would become unusable unless it was done.

Although such a phenomenon does not necessarily occur routinely, it is thought to occur due to differences in the characteristics of the magnetic pump and the usage conditions.

In order to prevent this type of impeller locking phenomenon, conventional methods have been designed to apply magnetic suction force in a direction that prevents the fixed shaft and bearing from colliding by magnetic coupling in the radial direction of the impeller. Various proposals have been made, but if they have the same level of functionality, the problem is that the structure and r-method will inevitably become larger if such measures are taken.

The present invention aims to provide a magnetic pump equipped with a lock release function that can easily release the impeller lock even if such an impeller lock phenomenon occurs.
1, and has a compact shape that allows the molding side 1. A second object of the present invention is to provide a magnet pump that can effectively suppress the occurrence of cavities/dens while being easy to do so.

[R stage to solve the problem]

The present invention provides impeller lock prevention for small and extremely common magnets and throat pumps, rather than prevention. The filling is placed in the

]-In order to achieve the first object, the present invention forms an impeller housing chamber in the main body casing that communicates with the suction 1 and the discharge 1, and inserts a fixed shaft into this impeller housing chamber. The bearing attached to the impeller is rotatably supported on the fixed shaft, and the end face of this shaft is connected to the support part formed on the outer periphery of the fixed shaft. 11 Gold to close the end X1j
At the same time, fix the peripheral part of the partition plate made of No. 4 to the main body casing, and place the base end of the fixed shaft in one line in the center of the partition plate, and The partition plate is characterized in that by forming ripple-like circular ribs around the periphery, the partition plate has spring properties that act in the axial direction of the fixed shaft. It is preferable that the tip protrudes outside the main casing.

Furthermore, the inlet and outlet formed in the main body casing]
'' are arranged in the same direction, the second objective can be achieved.

In this case, by forming a suction chamber with a larger cross-sectional area than the suction [-1] at the base end of the suction [21] that opens toward the impeller housing side, the occurrence of cavitation can be reliably suppressed. .

[For production]

In the present invention, as a method of releasing the impeller lock without disassembling the pump part while it is in use and operating condition,
Utilizes inertia force and impact force.

When the impeller bearing and the fixed shaft are in a fixed state, the attached part can be used to magnetize the impeller from the outside of the main casing.
The surface contact portion in the suction direction for throat driving, that is, the thrust force direction is 1: off.

This surface J2j contact part, that is, the end face of the shaft/receiver and the fixed shaft.
? By applying an impact force in the axial direction to the sliding part with the seat, the fixed shaft prevents axial movement, the impact force is transmitted to the partition plate, and the reaction causes the partition plate to move axially to the fixed shaft. vibration in the direction 'j', and the said attached parts are separated by 71 degrees.

In this case, by causing the tip of the fixed shaft to protrude outside the main casing, an impact can be easily applied by hitting the protruding tip of the fixed shaft with a hammer or the like.

Note that since the shaft to which the impact force is applied is a fixed shaft, it is not possible to increase the rotational force, but it is possible to create a configuration that causes movement in the axial direction, and a concrete measure for this is to use a partition with a fixed shaft. The idea was to apply a spring force to the plate.

In addition, this spring property has a spring constant fl high enough to be completely unaffected by the attraction force of the magnet.

Since the impeller is constantly pulled in the axial direction by the magnetic attraction force, the direction of movement will be the same under mild impact force and no peeling effect will occur. The impact force is 24, which is strong enough to hit the object.

Further, by arranging the suction 1-1 and the discharge [1] in the same direction, the external shape can be made compact, and the direction in which the mold for forming the main body casing is removed is simplified. Furthermore, by providing the suction chamber at the base end of the suction port, a structure that is less likely to cause cavitation can be achieved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 1 is a partially cutaway plan view of a magnet pump according to this embodiment, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is an exploded perspective view thereof. In these figures, (1) is a bottomed cylindrical body casing with one end open, and is usually molded from heat-resistant and water-resistant synthetic resin or plane metal casting.

A large-diameter impeller housing chamber (3) in which the impeller (2) is housed is formed in this main body casing (seal) facing the end opening, and is communicated with this impeller housing chamber (3). and the inlet nipple (4) and the outlet nipple (5).
) are formed on the main casing (1) and the body.

These suction [1 nipple (4)] and discharge [1 nipple (5)] are both connected to hoses etc. as fluid suction [1 and discharge []. The shaped circumferential stepped portion is continuously formed. Further, the suction 1-1 pull (4) and the discharge 1-1 nipple (5) both protrude from the main body casing (1) with the same amount of force in the V line.

A cylindrical suction chamber (6) is provided at the proximal end of the suction nipple (4) that opens toward the impeller housing chamber (3).
This is provided. This suction chamber (6) prevents cavitation! This is a small chamber provided for the purpose of storing the impeller, and is concentric with and in the same room as the impeller housing chamber (3).
The suction [
1 nipple (4) is communicated. Further, the longitudinal section of the suction chamber (6) is formed to have a larger cross-sectional area than the inner diameter cross section of the pull (4).

The main body casing (
1) A small protrusion (7) with 11 shaft holes (7a) provided in the center is protruding from the center of the end. The shaft hole (7a)
Insert the fixed shaft (8) of the impeller (2) into the shaft hole (1).
7a), and an O-ring (10) is fitted into a circumferential groove (9) carved on the outer periphery of the fixed shaft (8) within the small protrusion (7). , this 01
By bringing the J-ring (10) into close contact with the inner circumferential wall surface of the small protrusion (7), the body casing (1) is exposed to the outside.
The inside is sealed in a liquid-tight cane.

As the constituent material of the fixed shaft (8), heat-resistant and hot water-resistant materials such as ceramics are suitable, and in this embodiment, a material made of stainless steel with chromium plating on the surface is used. .

The fixed shaft (8) inserted into the shaft hole (7) penetrates the suction chamber (6) and projects into the impeller housing chamber (3), and the fixed shaft (8) penetrates through the suction chamber (6) and projects into the impeller housing chamber (3), and is inserted into this projecting portion via a bearing (11). A device F is used to freely rotate the impeller (2). In addition, the fixed axis (
In the axial direction 1 of 8), the bearing (11)) and 6 are located in the middle part.
Facing the end, the impeller (2) comes off 11.
・, 11・, the ring (12) is held and fixed with an appropriate rearance (g) in the thrust direction.

The bearing (II) is embedded and fixed in the body at the rotation center of the impeller (2). As the constituent material of this axis '2 (l l ), carbon or fluorine-based resin is used in the film.

The impeller (2) is made of a synthetic resin with excellent heat resistance and hot water resistance, such as polyphenylene oxide resin, and magneso(H) is embedded therein during molding.

Further, the fixed shaft (8) is provided with the bearing (
II) Thrust washer (
14) are engaged and fixed. Note that this thrust washer (
14) is a material other than metal, such as ceramic.

It is more preferable to use a material consisting of the following.

Furthermore, a partition plate (
A male thread is formed into which a nut (1G) is screwed to fix the I5), and the shaft end is attached to the bolt head (17).
has been done. With this configuration, the nut 7) (1G) is screwed in with the 1゛6 inserted through the center mounting hole of the partition plate (I5), and the partition plate (I5) is inserted between the bolt head (1B) and the bolt head (17). A plate (15) is held at a distance of 4A.

This fixed shaft (8) is located opposite to the upper end of the fixed shaft (8).
) and the same axis line 1. A drive (18) having a rotation center is disposed at. This drive tl [(18) is driven and rotated by a power shaft such as a motor, and L is driven by a magnet) (19
) is attached, and this magnet (19) connects the magnet (13) of the impeller (2) to the partition plate (15).
) are constantly suction-coupled with each other in between, and this drive 111° (
18), the impeller (2) is driven to rotate.

The partition plate (15) is a disc-shaped one made of a non-magnetic austenitic stainless steel plate (for example, 5US304), and has 6 holes inserted into screw holes provided at the periphery.
The main body casing (1) is fixed by the main fixing screw (20).
is fixed to the lower surface of the impeller housing chamber (3
) is closed. Although not shown, in order to maintain liquid tightness between the joint surfaces during this fixing,
O-ring and sealant are applied to the joint surface.

Further, a ripple-shaped circular rib (21) is formed around the central part of the partition plate (15) where the shaft end of the fixed shaft (8) is in close contact with the partition plate (15). The plate (15) is provided with the effect of a spring in the form of a diaphragm that supports the axial force of the fixed shaft (8), so that the fixed shaft (8) can be moved in the axial direction.

Next, to explain the operation of configuration 1-, fluid such as water flows into the intake nipple (4) of the main casing (1) from the direction of arrow α. When the impeller (2), which is interlocked and connected by the suction force of the magnet (+3HI9), rotates due to the drive rotation of the drive tube (18), negative pressure is created in the suction chamber (6), and the fluid flows around the circumference of the impeller (2). 11th year high school student
and is pressed, and the main casing (1) is discharged 1-1
It is ejected from Nimple (5) in the direction of arrow β.

This is normal pump function. However, if the bearing (11) is left unused for a long time due to a state of suspension, the thrust washer (I4)
) side firmly. In this case, one end of the fixed shaft (8) should be hit with a hammer or the like from the direction of the arrow γ.
g) to 0, and the thrust washer (14) and bearing (711) move in the direction away from each other.

This movement of the fixed shaft (8) is transmitted to the cutting plate (15), which in reaction causes the fixed shaft (8) to vibrate in the axial direction, ensuring the fixed part. Peel it off.

Note that the movement of the fixed shaft (8) may be extremely small.

By the above operations 1 and 2, the inverter rotor state is canceled and IE normal operation becomes +ij function.

〔Effect of the invention〕

As explained above-1-, when using the magnetic pump of the present invention, even if the bearing end face of the impeller sticks to the seat of the fixed shaft and causes an impeller lock, no impact force in the axial direction is applied to this surface contact part. 5, the fixed shaft moves in the axial direction, an impact force is transmitted to the partition plate, and as a reaction, the partition plate applies vibration to the fixed shaft in the axial direction, ensuring that the stuck part is peeled off. This makes it unnecessary to disassemble and repair the system, and the configuration is simple, so even in the event of a failure,
Decomposition assembly ~χ can be easily performed.

It should be noted that the lock can be released by an axial impact, but if a strong impact is applied to the structure when it is firmly stuck, the impeller will hit the middle surface of the IJJ root, and a force in the direction of separation will be forcibly applied. The certainty of the formula ``,'' is extremely high.

Also, 111 of the main body casing. Since the ill I 1 and the suction port are ・141j, which are suitable for the same amount of force, the space volume of the finished pump product is compact, and
Main body casing/IT #J resin molded product has a simple mold removal direction, improving workability.Furthermore, a suction chamber is provided at the suction port of the main body casing, making the pump less prone to cavitation. It has achieved excellent effects that have never been seen before.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention.
1 and 2 are longitudinal sectional views, FIG. 3 is an exploded perspective view, and FIG. 4 is an external perspective view of a main body casing of a conventional magnet pump. (ri...main casing, (2)...impeller, (
3)... Impeller accommodation chamber, (4)... Suction port, (5
)...Discharge [1, (6)...Suction chamber, (8
)... Fixed shaft, (11)... Bearing, (14)...
Seat part, (15)... (l cut plate, (21)... ripple-like circular rib.

Claims (4)

[Claims] (1) An impeller housing chamber that communicates with the suction port and the discharge port is formed in the main body casing, a fixed shaft is inserted into this impeller housing chamber, and the bearing attached to the impeller is rotatably supported by the fixed shaft. , an end face of the bearing is received by a seat formed on the outer periphery of the fixed shaft, while a peripheral part of a metal partition plate that closes an open end of the impeller housing chamber is fixed to the main body casing; The proximal end of the fixed shaft is fixed to the center of the partition plate, and a ripple-shaped circular rib is formed around the fixed shaft fixed part of the partition plate, so that the fixed shaft is attached to the partition plate. A magnetic pump characterized by having spring properties that act in the axial direction. (2) The magnet pump according to claim (1), wherein the tip of the fixed shaft supporting the impeller projects outside the main casing. (3) The magnet pump according to claim (1), wherein the suction port and the discharge port formed in the main body casing are arranged in the same direction. (4) The magnet pump according to claim (1), wherein a suction chamber having a larger cross-sectional area than the suction port is formed at the base end of the suction port that opens toward the impeller housing chamber.