JPH10238491A - Canned motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently take away heat generated in a power unit by allowing fluid discharged from a pump unit for sucking and discharging the liquid to pass, and providing a heat-transfer pipe disposed around a stator core and a heat transfer device brought into contact with a heat generating unit or a heat radiator of an inverter and the heat-transfer pipe. SOLUTION: Treating liquid flows into a casing 7 through an intake path 71. The treating liquid discharged from an upper one of a pair of discharge paths 73 passes rightward inside a heat-transfer pipeline 1. The treating liquid discharged from a lower one of the discharge paths 73 passes a passages 52 formed inside a stator mold portion 5 and a pair of treatment passage 81, 81 respectively disposed above and under in an end block 8, and finally, is discharged outside from a discharge port 83. Heat generated at a power unit 41 is transferred to the heat-transfer pipe 1 through a heat-transfer plate 2, and then, is taken away by the treating liquid passing inside of the heat-transfer pipe 1. In contrast, heat generated at a stator core 3 and a stator coil 33 is taken away outside by the treating liquid passing the heat-transfer pipe 1 and the passage 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor pump, and more particularly to a canned motor that can efficiently cool a heat generating portion of an inverter device and does not require a cooling fan for cooling the inverter device.

[0002]

2. Description of the Related Art In general, an inverter device having a power unit for directly controlling a motor and an inverter control unit for controlling the power unit is generally used for controlling a motor in a canned motor pump. It is used for

Conventionally, the power unit and the inverter control unit are housed in one control panel, and a cooling fan is provided in the control panel for the purpose of radiating heat generated by the power unit.

As described above, since the conventional control panel is provided with the power section, the inverter control section, and the cooling fan, there is a problem that the control panel becomes large. Although the control panel is provided with the cooling fan as described above, the inverter control section is heated to a high temperature by the heat generated by the power section. Therefore, there is a possibility that the inverter control unit is adversely affected by the heat and sends an erroneous instruction to the power unit to cause it to malfunction. Further, dust that has entered the inside of the control panel through the cooling fan,
It may adhere to the power unit and the inverter control unit, and this may be overheated by the heat from the power unit and cause a fire. Further, there is a problem that the cooling fan attached to the control panel becomes a noise source.

An object of the present invention is to provide a canned motor pump in which a power unit for controlling a motor of a canned motor pump is efficiently cooled and an inverter control unit is hardly affected by heat generated in the power unit. I do.

[0006]

A canned motor pump for solving the above-mentioned problems has the following features. (1) A fluid discharged from a pump section for sucking and discharging a fluid is circulated.
And (2) a canned motor pump comprising: a heat transfer pipe arranged on the outer periphery of the stator core; and a heat transfer means that comes into contact with the heat transfer section or the heat generating portion or the heat radiating means of the inverter device. ) The heat transfer pipe in the above (1)
The canned motor pump according to (1), wherein the canned motor pump is connected to a discharge path for discharging liquid, which the pump section in (1) has.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, a canned motor pump according to the present invention allows a fluid discharged from a pump portion for sucking and discharging a fluid to flow, and a heat transfer pipe disposed on the outer periphery of a stator core. And a heat transfer means for contacting the heat transfer section and the heat generating portion or heat radiating means of the inverter device. Hereinafter, the canned motor pump of the present invention will be described by way of example.

FIG. 1 shows an example of a canned motor pump in which a heating section of an inverter device is mounted on a canned motor pump, and a heat transfer pipe and a stator core are provided in a stator mold section. FIG. 4 is a vertical cross section of the canned motor pump cut along a plane including an axis of a shaft of the rotor.

FIG. 2 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 1 taken along a plane AA.

In the canned motor pump shown in FIG. 1, the stator core 3 has a substantially hollow cylindrical shape.

A stator can 51 having a substantially hollow cylindrical shape is fitted inside the stator core 3.

As shown in FIG. 2, the stator core 3
A tooth-shaped projection 31 which is a tooth-shaped projection having a wide end portion and protruding toward the center direction is formed on the inner surface of. A space 32 formed between two adjacent tooth-shaped protrusions 31 is filled with an insulated copper wire that is densely filled in a direction parallel to the tooth-shaped protrusions 31 and forms a stator winding 33. ing. An outer peripheral surface of the stator can 51 penetrates into a portion of the space 32 inside the stator winding 33.

In the space inside the stator can 51,
The rotor 6 is rotatably provided. The rotor 6 has a shaft 61. The shaft 61 is supported by bearings 62 and 63, and an impeller 71 is fixed to the left end of the shaft 61. The inner space of the stator can 51 communicates with a space inside the pump unit 7 described later and a handling liquid flow path 81 provided inside the end block 8 described later via bearings 62 and 63. doing.

As shown in FIG. 2, a pair of heat transfer pipes 1 made of stainless steel having a substantially right-angled triangular cross section are arranged above the stator core 3 so as to sandwich the stator core 3. ing. The pair of heat transfer pipes 1 are arranged such that two orthogonal surfaces of the heat transfer pipe 1 face outward with respect to the stator core 3. The surface of the heat transfer pipe 1 facing the stator core 3 has an arc-shaped cross-sectional shape along the outer peripheral surface of the stator core 3.

A heat transfer plate 2 made of stainless steel is mounted on the upper surface of the heat transfer pipe 1. The power section 41 of the inverter device, which controls the frequency and voltage of the alternating current flowing through the stator winding 33, is in contact with the upper surface of the heat transfer plate 2.
The power section 41 has a waterproof case 42, which protects the power section 41 from water intrusion. The power unit 4
The inverter control unit for controlling the timing of firing the thyristor included in 1 and the like is housed inside a control panel (not shown) provided at a position away from the canned motor pump. The inverter control unit is connected to the power unit 41 by electric wires that transmit various control commands from the inverter control unit to the power unit 41.

As shown in FIG. 2, the stator core 3 and the heat transfer pipe 1 are molded with polydicyclopentadiene, whereby the stator core 3 and the heat transfer pipe 1 are formed.
, A stator mold part 5 having a substantially square cross section is formed. The upper surface of the heat transfer pipe 1 is exposed without being covered with the stator mold part 5 because the heat transfer plate 2 is attached as described above. Further, the stator mold part 5 is formed integrally with the stator can 51. Further, the lower half of the stator mold part 5, that is, the part opposite to the side where the heat transfer pipe 1 is sealed,
A pair of flow paths 52 having a substantially right-angled triangular cross section are formed with the lower half of the stator core 3 interposed therebetween. Channel 52
The surface facing the stator core 3 has an arc-shaped cross-sectional shape along the outer peripheral surface of the stator core 3.

As shown in FIG. 1, one end of the stator mold section 5 is provided with a pump section 7 for sucking and discharging the handling liquid. The pump section 7 has an impeller 71 and a casing 70 that covers the impeller 71. The casing 70 extends in the same direction as the axis of the shaft 61,
One suction path 72 for sucking the handling liquid is provided. In the casing 70, a pair of discharge passages 73 for discharging the handling liquid are provided in an upper portion of the impeller 71, that is, an upper portion of the canned motor pump on which the power section 41 is mounted. , That is, two pairs in total at a portion on the side opposite to the side on which the power portion 41 is placed in the canned motor pump. A pair of discharge paths 73 provided above the impeller 71 are connected to one end of the heat transfer pipe 1, respectively. On the other hand, a pair of discharge paths 73 provided below the impeller 71
Are connected to one end.

On the other hand, an end block 8 having a discharge port 83 through which the handling liquid is discharged to the outside is fixed to the other end of the stator mold section 5. Inside the end block 8, two pairs of a handling liquid flow path 81 through which the handling liquid flows are formed in a pair at an upper side and a pair at a lower side. The two pairs of handling liquid channels 81 are integrated into one inside the end block 8 to form a handling liquid channel 82. Handling liquid channel 8
The right end of 2 is the discharge port 83. The heat transfer pipes 1 are respectively connected to a pair of handling liquid flow paths 81 provided above in the end block 8,
Are respectively connected to a pair of handling liquid channels 81 provided below inside the end block 8.

In the canned motor pump shown in FIG. 1, the heat transfer pipe 1 corresponds to the heat transfer pipe in the canned motor pump according to the present invention, and the heat transfer plate 2 corresponds to the heat transfer means in the canned motor pump according to the present invention. , The stator core 3 corresponds to the stator core in the canned motor pump of the present invention. The power unit 41 corresponds to a heating unit of the inverter device in the canned motor pump of the present invention.
The pump section 7 corresponds to a pump section in the canned motor pump of the present invention.

The operation of the canned motor pump shown in FIG. 1 will be described below.

In the canned motor pump shown in FIG.
The handled liquid flows into the casing 7 from the suction passage 71 and is discharged from the discharge passage 73 as indicated by the arrow. The handling liquid discharged from the upper pair of discharge paths 73 of the two pairs of discharge paths 73 passes through the inside of the heat transfer pipe 1 to the right, and the pair of liquids provided above the end block 8. The liquid is discharged from the discharge port 83 to the outside through the handled liquid flow path 81. The heat generated from the power unit 41 is transmitted to the heat transfer pipe 1 through the heat transfer plate 2, and is taken out by the handling liquid passing through the inside of the heat transfer pipe 1. Further, heat generated from the stator core 3 and the stator windings 33 is also taken out to the outside by the handling liquid passing through the inside of the heat transfer pipe 1.

On the other hand, the handling liquid discharged from a pair of lower discharge paths 73 passes through a flow path 52 formed inside the stator mold part 5 and a pair of lower liquids provided in the end block 8. The liquid is discharged from the discharge port 83 to the outside through the handling liquid flow path 81. The heat generated from the stator core 3 and the stator windings 33 is also taken outside by the handling liquid passing through the flow path 52.

Hereinafter, each element of the canned motor pump of the present invention will be described in detail.

In the canned motor pump of the present invention,
The heat transfer pipe is arranged on the outer periphery of the stator core. The heat transfer pipe is in contact with a heat transfer unit that transfers heat from a heat generating unit or a heat radiating unit included in the inverter device.
Inside the heat transfer pipe, the handled liquid sucked and discharged by the pump section in the canned motor pump of the present invention flows.

The heat transfer pipe may be arranged on the outer periphery of the stator core. Therefore, the heat transfer pipe may be simply brought into line contact or surface contact with the outer peripheral surface of the stator core, or the heat transfer pipe may be screwed or studd on the outer peripheral surface of the stator core. It may be fixed by any means such as stopping, bonding, heat sealing, welding, or brazing.

When the stator core has a jacket, the heat transfer pipe may be arranged in surface or line contact with the jacket. Here, in the stator core having a jacket, for example, the stator core is sealed with a synthetic resin,
It includes a stator core having a substantially cylindrical stator mold portion formed around the stator core, and a stator core having a metal or synthetic resin jacket.

Further, a heat transfer pipe may be arranged close to the outer peripheral surface of the stator core. In an embodiment in which the heat transfer pipe is arranged close to the outer peripheral surface of the stator core, for example, the minimum distance between the outer peripheral surface of the stator core and the outer peripheral surface of the heat transfer pipe is 1 to 2
An example is a mode in which the heat transfer pipe is arranged so as to be about 0 mm. Further, when the stator core has a jacket, the heat transfer is performed so that a minimum distance between an outer peripheral surface of the jacket of the stator core and an outer peripheral surface of the heat transfer pipe is about 1 to 20 mm. A mode in which a pipe is arranged is exemplified.

In addition, the heat transfer pipe and the stator core are sealed with a synthetic resin while the heat transfer pipe is arranged close to the outer peripheral surface of the stator core as described above. It is also preferable that the heat transfer pipe is embedded in the stator mold. However, in this aspect, it is preferable that a surface or a ridge line of the heat transfer pipe with which the heat transfer means contacts is exposed on a surface of the stator mold portion.

In another preferred embodiment, the stator core, the heat transfer pipe and the heat transfer means are sealed, and the heat transfer pipe and the heat transfer means are embedded in the stator mold part. However, in this aspect, in the heat transfer means, it is preferable that a surface of the inverter device, which is in contact with the heat generating portion or the heat radiating means, is exposed on the surface of the stator mold portion.

Examples of the synthetic resin that can be used for sealing the stator core and the like include various synthetic resins, for example, a thermosetting resin and a thermoplastic resin.

Examples of the thermoplastic resin include polyphenylene sulfide, syndiotactic polystyrene,
Examples include thermoplastic engineering plastics such as isotactic polystyrene, polyketone, polyetherketone, polyetheretherketone, polysulfone, polyethersulfone, aromatic polyester, and polyamideimide. Examples of the thermosetting resin include an epoxy resin, a phenol resin, a silicone resin, and a polyimide.

Further, monomers, oligomers, polymerization catalysts,
Also, a synthetic resin obtained by curing a reactive stock solution containing one or more components selected from catalyst assistants is preferably used.

As the reactive stock solution, for example, a reactive stock solution used in a usual reaction injection molding method (hereinafter referred to as “RIM”) can be mentioned. In particular,
Combination of reactive stock solutions used in polydicyclopentadiene RIM, combination of reactive stock solutions used in polyester RIM, combination of reactive stock solutions used in epoxy RIM, nylon RI
Examples of the combination include a combination of the reactive stock solutions used in M and a combination of various reactive stock solutions used in the polyurethane RIM.

Among the above-mentioned reactive stock solutions, the combination of the reactive stock solutions used in the polydicyclopentadiene RIM is most preferable. This is because polydicyclopentadiene has tensile strength and rigidity comparable to metal, so that there is no problem in strength even when used for molding a can having a thickness of 0.5 to 1.5 mm. Is due to the property of increasing toughness when heat is applied. The reason why the polydicyclopentadiene increases the toughness due to heat may be that the polydicyclopentadiene undergoes crosslinking at the double bond portion in the molecule due to the heat.

Examples of the combination of the reactive stock solution producing polydicyclopentadiene include a reactive stock solution containing dicyclopentadiene and a metal catalyst, and a reaction solution containing dicyclopentadiene and an activator such as trialkylaluminum. Combination with an undiluted solution.

In order to seal the stator core and the like, these synthetic resins may be used alone, or a mixture of these synthetic resins with a filler such as glass fiber, ceramic fiber, or talc may be used. An object may be used.

As a method used for sealing the stator core or the like, for example, RIM, resin transfer molding, reaction casting, casting, injection molding, and the like are used. Among these methods, the reaction injection molding method is particularly preferable because the mold closing force may be small and the method is suitable for molding a large-sized product having a complicated shape such as a stator of a canned motor pump. In addition, polydicyclopentadiene RIM in which RIM is performed using a reactive stock solution containing dicyclopentadiene as a monomer component is most preferable in that a stator mold portion having high strength is obtained.

In performing the sealing, the stator can, which is a substantially hollow cylindrical member inserted into the cavity of the stator core, can also be formed integrally with the stator mold portion. . In addition, a stator can made of metal, synthetic resin, or fiber reinforced resin formed in advance is inserted into the cavity of the stator core, and in this state, the stator core and the like are sealed using the synthetic resin. You may.

The cross-sectional shape of the heat transfer pipe is not particularly limited, and examples of possible cross-sectional shapes include polygons such as triangle, square, pentagon, and hexagon, circles, sectors, and arcs. Various shapes can be mentioned. Among these shapes, a triangle, in particular, a substantially right triangle shape as illustrated in FIGS. 1 and 2, and a circular shape are preferable, and a large heat transfer surface between the heat transfer means and a heat transfer means described later is required. In view of this, a substantially right triangle shape is particularly preferable.

There is no particular limitation on the material of the heat transfer pipe, and metal materials such as stainless steel, aluminum alloy, corrosion-resistant aluminum alloy, titanium, copper, bronze, brass, nickel silver and nickel alloy, alumina, boron nitride, carbonized Various materials such as ceramics such as silicon and silicon nitride, synthetic resins, and fiber-reinforced resins reinforced with fibers such as glass fibers or carbon fibers can be used. Among these materials, metal materials are preferred because of their high thermal conductivity. The heat transfer pipe may be formed at the same time when the stator mold section is formed by RIM.

The heat transfer means may be of any shape and material as long as it can contact the heat transfer pipe and transfer heat from the heat generating portion or the heat radiating means of the inverter device to the heat transfer pipe. There is no particular limitation.

As the heat transfer means, for example, FIGS.
The heat transfer plate exemplified in the above. The heat transfer plate may have one or more fins on one or both sides. Materials for the heat transfer plate include metal materials such as stainless steel, aluminum alloys, corrosion-resistant aluminum alloys, titanium, copper, bronze, brass, nickel silver, and nickel alloys, and ceramics such as alumina, boron nitride, silicon carbide, and silicon nitride. And various materials such as synthetic resin, and fiber reinforced resin reinforced with fiber such as glass fiber, carbon fiber, or ceramic fiber. Among these materials, metal materials are preferred because of their high thermal conductivity.

Examples of the mode in which the heat transfer pipe contacts the heat transfer plate include a mode in which the side surface of the heat transfer pipe having a circular cross section and one surface of the heat transfer plate are in line contact, and a mode in which the heat transfer pipe has a polygonal cross section. An aspect in which the ridge line on the side surface of the heat transfer pipe is in line contact with one surface of the heat transfer plate, and an aspect in which one or more side surfaces of the heat transfer pipe having a polygonal cross section are in contact with one surface of the heat transfer plate. And a mode in which a side surface of the heat transfer pipe and a groove provided in the heat transfer plate are fitted. Further, the heat transfer plate has a convex portion, the heat transfer pipe has a concave portion on the side surface that fits into the convex portion, the mode in which the convex portion fits into the concave portion, and the heat transfer pipe is convex on the side surface. A mode in which the heat transfer plate has a concave portion corresponding to the convex portion and the convex portion fits in the concave portion is also included in the mode in which the heat transfer pipe contacts the heat transfer plate. In these embodiments, there is no particular limitation on the shapes of the convex portions and the concave portions.
The projection may be a projection or a continuous or intermittent ridge. However, when the convex portion is a ridge, the concave portion is preferably a groove fitted into the ridge. When the heat transfer pipe and the heat transfer plate are in surface contact with each other, the protrusion may be provided on one of the contact surfaces between the heat transfer pipe and the heat transfer plate, and the recess may be provided on the other. Good.

The mode in which the heat transfer pipe contacts the heat transfer plate also includes a mode in which the heat transfer plate and the heat transfer pipe are integrated. As an example of the mode in which the heat transfer plate and the heat transfer pipe are integrated, for example, a mode in which a part of the heat transfer plate is a part of the heat transfer pipe is given. In such an embodiment,
For example, an embodiment in which a heat transfer plate and a heat transfer pipe are integrally formed by extrusion of an aluminum alloy or the like, and an upper end of a metal plate bent in a V-shape or a U-shape is brazed to one surface of the heat transfer plate. And the like in which a heat transfer pipe is formed. When a heat transfer plate having fins on one or both sides is used as the heat transfer means, a mode in which the heat transfer pipe penetrates the fin is also included in a mode in which the heat transfer pipe contacts the heat transfer means.

As the heat transfer means, in addition to the above-described heat transfer plate,
A heat transfer means in which at least one surface of the heat transfer pipe also serves as a heat transfer means is also included. As an example of such a heat transfer means, for example, in a canned motor pump in which a pair of heat transfer pipes having a triangular cross section are arranged adjacent to each other, a surface other than the surface facing the stator core is used as the heat transfer means. There are aspects and the like.

When the heat transfer pipe and the heat transfer means are separately formed, the heat transfer pipe and the heat transfer means may be detachably attached or fixed to each other.

The method of detachably attaching the heat transfer pipe and the heat transfer means includes a method of fixing the heat transfer pipe and the heat transfer means with a screw, and a method of fixing one of the contact surfaces between the heat transfer pipe and the heat transfer plate. A method of connecting the heat transfer pipe and the heat transfer means by fitting the protrusion and the recess to each other, and magnetically fixing the heat transfer pipe to the heat transfer means. And the like. Only one of these methods may be used, or two or more methods may be used in combination.

The means for fixing the heat transfer pipe and the heat transfer means may be any means such as screwing, tacking, bonding, heat welding, welding, or brazing.

The liquid to be handled flows inside the heat transfer pipe.
Therefore, it is preferable that the heat transfer pipe is connected to a suction path of the pump section for sucking the handled liquid or a discharge path for discharging the handled liquid. From the viewpoint of pump efficiency, it is particularly preferable to be connected to the discharge path.

In the present invention, the inverter device has a power section and an inverter control section. The heat generating portion of the inverter device includes a portion of the inverter device that generates a large amount of heat. Such a portion includes, specifically, the power portion. The heat generating portion of the inverter device may be sealed in a sealed container, or may be sealed with an epoxy resin or the like. Further, the heat generating portion of the inverter device may have a heat radiating means such as a fin. When the heat generating portion of the inverter device is sealed in a closed container, the heat radiating means may form a part of the closed container.

Examples of a mode in which the heat transfer means is brought into contact with the heat generating section or the heat radiating means of the inverter device include a mode in which the power section is directly attached to the heat transfer section, and a mode in which the power section is fixed to a metal chassis. There are a mode in which a chassis is attached to the heat transfer means, and a mode in which the power unit is mounted on a table having a radiation fin, and the table is mounted on the heat transfer means.

It is preferable that the heat generating portion or the heat radiating portion of the inverter device be detachably attached to the heat transfer means because it is convenient to inspect or replace the heat generating portion of the inverter device. As a method of detachably attaching the heat generating portion or the heat radiating portion of the inverter device to the heat transfer means, for example, screwing or the like may be used.

Hereinafter, another example of the canned motor pump of the present invention will be described.

FIG. 3 shows an example in which a part of the heat transfer plate 2 is a part of the heat transfer pipe 1 in the canned motor pump of FIG. FIG. 3 is a cross-sectional view showing a cross-section taken along the line.

In the canned motor pump shown in FIG. 3, the stator core 3 and the stator mold section 5 have the same structure as the canned motor pump shown in FIG. or,
The canned motor pump shown in FIG. 3 is the same as the canned motor pump of FIG. 1 also in that the power section 41 of the inverter device is mounted on the heat transfer plate 2. Further, a pump unit 7 not shown in FIG. 3 is provided at one end of the stator mold unit 5, and an end block 8 not shown in FIG. 3 is provided at the other end of the stator mold unit 5; A pair of heat transfer pipes 1 having a substantially right triangle cross section
However, they are the same in that they are arranged at positions sandwiching the upper half of the stator core 3 and are buried inside the stator mold part 5.

However, in the canned motor pump shown in FIG. 3, since a part of the heat transfer plate 2 forms a part of the heat transfer pipe 1, the heat transfer pipe 1 and the heat transfer plate 2 are integrated. I have. A V-shaped member 11 obtained by bending a stainless steel plate into a substantially V-shape is fixed to the lower surface of the heat transfer plate 2 made of stainless steel. The upper end of the V-shaped member 11 is bent inward to form a horizontal plane. The V-shaped member 11 is fixed to the heat transfer plate 2 at the portion of the horizontal plane.

Also in the canned motor pump shown in FIG. 3, the heat transfer pipe 1 corresponds to the heat transfer pipe in the canned motor pump of the present invention, and the heat transfer plate 2 corresponds to the heat transfer pipe in the canned motor pump of the present invention. Corresponding to the means, the stator core 3 corresponds to the stator core in the canned motor pump of the present invention. The power unit 41 corresponds to a heating unit of the inverter device in the canned motor pump of the present invention. The pump section 7 corresponds to a pump section in the canned motor pump of the present invention.

FIG. 4 shows an example of the canned motor pump of FIG. 1 in which the heat radiating portion of the inverter device is mounted on the upper surface of the heat transfer plate 2. The canned motor pump is taken along a plane AA in FIG. It is sectional drawing which shows the cross section cut | disconnected.

In the canned motor pump shown in FIG. 4, the stator core 3 and the stator mold section 5 have the same structure as the canned motor pump shown in FIG. or,
A pump unit 7 not shown in FIG. 4 is provided at one end of the stator mold unit 5, and an end block 8 not shown in FIG. 4 is provided at the other end of the stator mold unit 5. A pair of heat transfer pipes 1 having a substantially right-angled triangular cross section is arranged at a position sandwiching the upper half of the stator core 3 and is buried inside the stator mold portion 5. is there.

However, in the canned motor pump shown in FIG.
4 is attached to an aluminum base 43 having a lower surface 4. The radiation fins 44 are provided perpendicular to the lower surface of the base 43. The base 43 is mounted on the upper surface of the radiator plate 2 so that the lower end of the radiator fin 44 contacts the upper surface of the radiator plate 2. still,
In the power unit 41, the lower end of the housing 42 is fixed to the base 43, whereby the housing 42 and the base 43 form a closed container.

In the canned motor pump shown in FIG. 4, the heat transfer pipe 1 corresponds to the heat transfer pipe in the canned motor pump of the present invention, and the heat transfer plate 2 corresponds to the heat transfer means in the canned motor pump of the present invention. , The stator core 3 corresponds to the stator core in the canned motor pump of the present invention. The power part 41 corresponds to a heat generating part of the inverter device in the canned motor pump of the present invention, and the base 43 having the radiation fins 44 corresponds to a heat radiating means of the inverter device in the canned motor pump of the present invention. The pump section 7 corresponds to a pump section in the canned motor pump of the present invention.

In the canned motor pump shown in FIG.
The heat generated in the power unit 41 of the inverter device is transferred to the base 4
3 to the heat radiation fins 44. Heat radiation fins 4
Part of the heat transferred to the heat transfer fins 4 is radiated by the heat radiation fins 44, and the rest is transferred to the heat transfer plate 2. The heat transmitted to the heat transfer plate 2 is removed by the handling liquid flowing in the heat transfer pipe 1.

FIG. 5 shows an example of a canned motor pump in which a pair of heat transfer pipes having a substantially right-angled triangular cross section are arranged on the outer peripheral surface of a substantially cylindrical stator mold. It is the longitudinal section which cut the canned motor pump along the plane which contains an axis.

FIG. 6 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 5 taken along a plane AA in FIG.

In the canned motor pump shown in FIG. 5, the substantially hollow cylindrical stator core 3 is sealed with polydicyclopentadiene, thereby forming a substantially cylindrical stator mold portion covering the stator core 3. 5 are formed.

As shown in FIG. 6, the radiation fins 53 and 54 are provided on the lower half of the outer peripheral surface of the stator mold portion 5, that is, on the portion of the outer peripheral surface opposite to the side where the heat transfer pipe 1 is arranged. Are formed. Here, the radiation fins 53 are radiation fins extending in the axial direction of the shaft 61 of the rotor 6, and the radiation fins 54 are radiation fins extending at right angles to the axis and in the circumferential direction. is there. The structure of the stator core 3 is the same as the structure of the stator core 3 included in the canned motor pump of FIG.

On the other hand, the upper half part of the outer peripheral surface of the stator mold part 5, that is, the part opposite to the side where the radiation fins 53 and 54 are provided, has a substantially right triangle as shown in FIG. Pair of stainless steel heat transfer pipes 1
Are fixed relative to each other. The surface of the heat transfer pipe 1 on the side in contact with the outer peripheral surface of the stator mold portion 5 is curved in conformity with the shape of the outer peripheral surface.

A heat transfer plate 2 made of stainless steel is fixed to the upper surface of the heat transfer pipe.

The power unit 41 of the inverter device is mounted on the upper surface of the heat transfer plate 2. The power unit 41 includes:
It has a waterproof housing 42, which is protected from water intrusion and the like. The inverter control unit not shown in FIGS. 5 and 6 is housed inside a control panel (not shown) provided at a position away from the canned motor pump, similarly to the case of the canned motor pump of FIG. I have.
The inverter control unit is connected to the power unit 41 by electric wires that transmit various control commands from the inverter control unit to the power unit 41.

Incidentally, at one end of the stator mold part 5,
A pump section 7 for sucking / discharging the handled liquid is fixed, and an end block 8 is fixed to the other end of the stator mold section 5.

In the pump section 7, as shown in FIG.
Are provided as a pair. Except for this point, the pump section 7 has substantially the same structure as the pump section 7 of the canned motor pump of FIG.

The pair of discharge paths 73 are respectively
It is connected to one end of the heat transfer pipe 1.

On the other hand, in the end block 8 fixed to the other end of the stator mold section 5, as shown in FIG. 5, the handling liquid flow path 81 is formed only on the side where the power section 41 is mounted. A pair is formed, and the pair of handling liquid channels 81
Are combined into one inside the end block 8 to form a handling liquid flow path 82. Except for this point, the other end block 8 has substantially the same structure as the end block 8 of the canned motor pump of FIG.

The other end of the heat transfer pipe 1 is connected to a handling liquid flow path 81.

In the canned motor pump shown in FIG. 5, the heat transfer pipe 1 corresponds to the heat transfer pipe in the canned motor pump of the present invention, and the heat transfer plate 2 corresponds to the heat transfer means in the canned motor pump of the present invention. , The stator core 3 corresponds to the stator core in the canned motor pump of the present invention. The power unit 41 corresponds to a heating unit of the inverter device in the canned motor pump of the present invention.
The pump section 7 corresponds to a pump section in the canned motor pump of the present invention.

The operation of the canned motor pump shown in FIG. 5 will be described below.

In the canned motor pump shown in FIG.
The handled liquid flows into the casing 7 from the suction passage 71 and is discharged from the discharge passage 73 as indicated by the arrow. Discharge path 73
From the heat transfer pipe 1
The liquid is discharged to the outside from a discharge port 83 through a pair of handling liquid flow paths 81 connected to the other end of the heat transfer pipe 1.

The heat generated from the power section 41 is
Through the inside of the heat transfer pipe 1, and is taken out by the handling liquid passing through the inside of the heat transfer pipe 1. Further, heat generated from the stator core 3 and the stator windings 33 is also transmitted to the heat transfer pipe 1 through the stator mold section 5 and is taken out by the handling liquid passing through the inside of the heat transfer pipe 1.

FIG. 7 shows an example of a canned motor in which a heat transfer plate provided with fins is used as the heat transfer means, and a heat transfer pipe penetrates the fins. FIG. 3 is a partial cutaway view showing a vertical cross section cut along a plane including the axis of the shaft.

FIG. 8 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 7 taken along a plane AA in FIG.

In the canned motor pump shown in FIG. 7, the stator core 3 and the stator mold section 5 have the same shape and structure as those shown in FIGS.

As shown in FIG. 6, a heat transfer plate 2 is attached to the upper half portion of the stator mold portion 5, that is, the portion not having the heat radiation fins 53 and 54.

The heat transfer plate 2 is made of a stainless steel substrate 21.
And a fin 22 made of stainless steel fixed vertically to the substrate 21. The fins 22
Has a substantially semi-circular cutout corresponding to the outer peripheral surface of the stator mold portion, and the cutout portion is in close contact with the outer peripheral surface of the stator mold portion.

The heat transfer pipe 1 having a circular cross section is fixed to the fins 22 so as to pass therethrough.

The power section 41 of the inverter device is mounted on the upper surface of the substrate 21.

The power section 41 is provided with a waterproof housing 4.
2, which are protected from water intrusion and the like. In addition, like the case of the canned motor pump of FIG.
An inverter control unit (not shown) provided at a position distant from the canned motor pump is housed inside a control panel (not shown). The inverter control unit is connected to the power unit 4 by electric wires that transmit various control commands from the inverter control unit to the power unit 41.
It is connected to 1.

In this canned motor pump, similarly to the canned motor pump of FIG. 5, a pump section 7 is fixed to one end of the stator mold section 5 and an end block 8 is attached to the other end of the stator mold section 5. Fixed. The structures of the pump unit 7 and the end block 8 are the same as the structures of the pump unit 7 and the end block 8 in the canned motor pump of FIG. A pair of discharge paths 73 provided in the pump unit 7 are respectively connected to one end of the heat transfer pipe 1, and the other end of the heat transfer pipe 1 is connected to a handling liquid flow path provided in the end block 8. 81.

In the canned motor pump shown in FIG. 7, the heat transfer pipe 1 corresponds to the heat transfer pipe in the canned motor pump according to the present invention, and the heat transfer plate 2 corresponds to the heat transfer means in the canned motor pump according to the present invention. , The stator core 3 corresponds to the stator core in the canned motor pump of the present invention. The power unit 41 corresponds to a heating unit of the inverter device in the canned motor pump of the present invention.
The pump section 7 corresponds to a pump section in the canned motor pump of the present invention.

The operation of the canned motor pump shown in FIG. 7 will be described below.

In the canned motor pump shown in FIG.
The handled liquid flows into the casing 7 from the suction passage 71 and is discharged from the discharge passage 73 as indicated by the arrow. Discharge path 73
From the heat transfer pipe 1
Through the handling liquid flow path 81 connected to the other end of the heat transfer pipe,
It is discharged to the outside from the discharge port 83.

The heat generated from the power section 41 is
Is transmitted to the fins 22 through the substrate 21 of the substrate. A part of the heat transmitted to the fins 22 is radiated by the fins 22 and the rest is transmitted to the heat transfer pipe 1 penetrating the fins 22. The heat transmitted from the fins 22 to the heat transfer pipe 1 is taken outside by the handling liquid passing through the inside of the heat transfer pipe 1. Further, heat generated from the stator core 3 and the stator windings 33 is also transmitted to the fins 22 and the heat transfer pipe 1 through the stator mold part 5.

[0092]

According to the canned motor pump of the present invention, since the power part of the inverter device is attached to the canned motor pump and cooled with the handling liquid, the heat generated by the power part can be efficiently removed.

Further, the power section and the inverter control section can be separated, and the inverter control section can be left inside the control panel.

Therefore, the size of the control panel can be greatly reduced, and the problem that the inverter control section is affected by the heat from the power section is eliminated. Also, since the inverter control unit generates much less heat than the power unit,
There is almost no need to provide a cooling fan in the control panel. Therefore,
The noise is much smaller than the conventional control panel. Furthermore,
The control panel can be easily made to have a closed structure.

[Brief description of the drawings]

FIG. 1 is an example of a canned motor pump in which a heat generating portion of an inverter device is mounted on a canned motor pump, and a heat transfer pipe and a stator core are provided in a stator mold portion. FIG. 2 is a cross-sectional view showing a vertical cross section of the canned motor pump taken along a plane including an axis of a shaft of the rotor.

FIG. 2 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 1 taken along a plane AA.

3 shows an example in which a part of the heat transfer plate 2 is a part of the heat transfer pipe 1 in the canned motor pump of FIG. 1. FIG. It is sectional drawing which shows the cross section cut | disconnected along A.

FIG. 4 shows an example of the canned motor pump of FIG. 1 in which a heat radiating portion of an inverter device is attached to an upper surface of a heat transfer plate 2;
FIG. 3 is a cross-sectional view showing a cross section cut along a plane AA in FIG.

FIG. 5 is an example of a canned motor pump in which a pair of heat transfer pipes having a substantially right-angled triangular cross section are arranged on the outer peripheral surface of a substantially cylindrical stator mold part; FIG. 4 is a cross-sectional view showing a vertical cross section of the canned motor pump cut along a plane including the axis of FIG.

FIG. 6 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 5 taken along a plane AA in FIG. 5;

FIG. 7 shows an example of a canned motor in which a heat transfer plate provided with fins is used as heat transfer means and a heat transfer pipe penetrates the fins. FIG. 3 is a partial cutaway view showing a vertical cross section cut along a plane including an axis of a shaft having the shaft.

FIG. 8 is a cross-sectional view showing a cross section of the canned motor pump shown in FIG. 7 taken along a plane AA in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat transfer piping, 2 ... Heat transfer plate, 3 ... Stator core, 31 ... Toothed protrusion, 32 ... Space, 33 ...
Stator winding, 41: power section, 42: housing, 4
3 Base, 44 radiating fins, 5 stator mold part, 51 stator can, 52 flow path, 53, 54 radiating fin, 6・ Rotator, 6
DESCRIPTION OF SYMBOLS 1 ... Shaft, 62, 63 ... Bearing, 7 ... Pump part, 70 ... Casing, 71 ... Impeller, 72
... suction path, 73 ... discharge path, 8 ... end block, 81, 82 ... handling liquid flow path, 83 ... discharge port

Claims (2)

[Claims] 1. A heat transfer pipe for circulating a liquid discharged from a pump section for sucking and discharging a liquid, and disposed on an outer periphery of a stator core, a heat generating section or a heat radiating means of an inverter device, and the heat transfer pipe. A canned motor pump, comprising: 2. The canned motor pump according to claim 1, wherein the heat transfer pipe according to claim 1 is connected to a discharge path for discharging liquid, which the pump section according to claim 1 has.