JP2003129986A - Motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor pump having improved performance by reducing size of a motor and increasing durability, and reducing the leakage of a liquid between a diagonal flow vane and a casing. SOLUTION: The motor pump comprises a housing case arranged between a first cap and a second cap and having a connection passage connecting a passage intake and a passage outlet and a stator formed therein and a rotor with a rotating shaft turnably arranged in the housing case. The rotating shaft of the rotor is provided with a diagonal flow impeller 60 which has a central body 61 integrated with the rotating shaft, the plurality of diagonal flow vanes 62 (62a, 62b, 62c, 62d) formed in the radial direction of the central body and a cylindrical portion 65 connected with the outer periphery ends of the diagonal flow vanes 62 and located close to the inner periphery face of the connection passage of the housing case. The outer periphery face of the cylindrical portion 65 is provided with a protruding strip 66 guided inside along the rotating direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor pump, and more particularly to a motor pump using a mixed flow blade for an impeller.

[0002]

2. Description of the Related Art Conventionally, there is known a technique in which a gap narrowing member made of a flexible material is fixed to the tip of a blade that rotates in proximity to the inner surface of a casing or a casing liner. For example, as this technique, as shown in FIGS. 11A and 11B, the tip portion of each blade 103 of the impeller 100, that is,
A gap narrowing member 120 for narrowing a gap with the inner surface of the suction casing 111 is fixed to a portion that rotates close to the inner surface of the suction casing 111. The gap narrowing member 120 has a low frictional resistance when it comes into sliding contact with the inner surface of the suction casing 111, has a high wear resistance, and can be easily bent, for example, a rubber, a synthetic resin, or a brush with a fine mesh. And the like, and the thickness of the base portion thereof is the same as the plate thickness of the blade 103. The support base 121 protruding from the center of the base end and the circular cross section formed at the tip thereof are used. The locking portion 122 has the same shape as those of the blades 103.
A metal fitting 132 that is engaged with the engaging portion 131 formed at the tip of the screw and that contacts both end surfaces of the narrowing member 120.
The blade 10 is fastened to the blade 103 by 33.
3 (for example, Japanese Patent Laid-Open No. 10-184)
589).

[0003]

The above technique has a problem in durability because the gap narrowing member is slidably contacted with the inner surface of the casing, and the gap narrowing member is slidably contacted with the inner surface of the casing. And a large capacity of the motor as a drive source is required, and it is necessary to replace the gap narrowing member when it deteriorates. This replacement requires disassembling the entire pump, which leads to an increase in maintenance costs. There is.

The present invention has been made to solve the above-mentioned inconvenience, and an object of the present invention is to reduce the size of the motor and to improve the durability thereof, and to reduce the leakage of liquid between the mixed flow vanes and the casing. Accordingly, it is to provide a motor pump having improved performance.

[0005]

According to the motor pump of the present invention, the above-mentioned problem is solved by the first aspect of the present invention in which a flow path inlet is formed.
A cap and a second cap having a flow passage outlet,
A housing case that is provided between the first cap and the second cap and has a connecting path that connects the flow path inlet and the flow path outlet, and forms a stator, and is provided in the housing. A motor pump comprising a rotor and a mixed flow vane, which sends fluid from the flow channel intake port to the flow channel discharge port,
The stator is formed by including a core iron core provided on the outer periphery of the connection path of the housing case and a coil wound around the core iron core, and the rotor is rotatably supported by a shaft. And a magnet formed on the outer periphery of the support member, and the mixed flow vane is formed at a central portion integrated with the rotary shaft. A main body, and a plurality of vanes radially from the central main body,
A tubular portion that connects the outer peripheral ends of the blades and is close to the inner circumferential surface of the communication passage of the housing case, and the outer circumferential surface of the tubular portion or the communication passage that faces the outer circumferential surface of the tubular portion. The problem is solved by providing a guide portion that guides inward along the rotational direction on at least one of the peripheral surfaces.

As described above, there is a slight gap between the outer circumference of the mixed flow vane and the inner circumference of the connecting passage when the fluid is sent. As a result, the fluid flows backward from this gap due to the reaction of the fluid sent by the mixed flow impeller. In order to prevent backflow in this gap, a tubular portion is provided in the mixed flow impeller, and at least one of the outer peripheral surface of the tubular portion and the inner peripheral surface of the communication path facing the outer peripheral surface is arranged along the rotational direction. A guide member. Since it is set so as to be guided to this guide member, it is returned to the inside even if it flows backward.

At this time, it is preferable that the guide portion is a spiral projection or groove formed along the rotational direction from the flow path inlet to the flow path outlet. According to this structure, the spiral shape provides a large backflow prevention force in the rotation direction.

Further, it is preferable that the guide portion is provided on both the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the connecting passage facing the outer peripheral surface of the cylindrical shape. If it is provided on both sides, the effect of guiding the fluid becomes greater.

As described above, according to the present invention, by forming the tubular portion and the guide portion in the mixed flow blade of the mixed flow impeller,
It is possible to improve the performance of the motor pump by reducing the amount of liquid leaking from the gap between the tips of the mixed flow vanes and the inner surface of the casing. At this time, since the tips of the mixed flow blades and the inner surface of the casing are not brought into sliding contact with each other, durability is improved, and since they are not brought into sliding contact with each other, the axial torque can be reduced and the capacity of the motor can be reduced. In this way, since the amount of leaking liquid can be reduced, it is possible to increase the flow rate and the pressure. Also, since the mixed flow vanes are connected by the tubular part,
It is possible to improve the strength of the blades, not to bring the tips of the mixed flow blades and the inner surface of the casing into sliding contact with each other, and it is possible to exert a remarkable effect of improving durability.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1 to 10 show an example of a motor pump according to the present invention. FIG. 1 is a sectional explanatory view, FIG. 2 is an explanatory view of an impeller viewed from the suction port side, and FIG. 3 is FIG. 3 is a side view and a partially enlarged sectional view of FIG. 4, FIG. 4 is a side view similar to FIG. 3 showing another example and an enlarged sectional view of a portion A, FIG. 5 is an explanatory view of a housing showing another example, and FIG. 5 is a sectional view taken along line AA of FIG. 5 and an enlarged view of an essential part, FIG. 7 is a sectional view similar to FIG. 6 showing another example and an enlarged view of an essential part, and FIG. 8 is a partial cross section taken along line BB of FIG. FIG. 9 is a partial sectional view taken along the line CC of FIG.
0 is a partial cross-sectional view taken along the line DD of FIG. 1.

As shown in FIG. 1, the motor pump 1 of the present example.
The reference numeral 0 has a first cap 20, a second cap 30, a housing 40, a rotor 50, and a mixed flow impeller 60.

The first cap 20 of this embodiment is made of resin, and as shown in FIGS. 1 and 10, a mixed flow impeller, which will be described later, is provided substantially inside the center of the cap body 21 (left side in FIG. 1). The recessed space 2 in which the mixed flow blades 62 of 60 are located
2 is formed. The recess wall surface 22 of the recess space 22
A is a tapered surface that matches the inclination of the mixed flow blade 62 of the mixed flow impeller 60. Further, a fitting portion 22c that fits into the housing is formed between the recess wall surface 22a and a flange portion 24 described later.

A bearing portion 23 of the rotary shaft is formed in the center of the recess space 22. This bearing 23 is
The first cap body 21 is connected to a plurality of connecting portions (four places in this example) 21a, and a space between the connecting portions 21a is a communication hole 25a communicating with the flow path inlet 25.

A flange portion 24 for connecting to a housing 40 described later is formed on the outer periphery of the inner space 22. A screw groove 24a into which a fastener 71 such as a bolt is screwed is formed at a predetermined position of the flange portion 24, and the fastener 71 such as a bolt is used to connect the first cap 20 and the housing 40 by using the screw groove 24a. It is assembled so that it becomes one. A flow path intake 25 is formed at the one end side of the motor pump, which is the side opposite to the recessed space 22. A fluid is formed so as to be able to flow through the pump from the flow path inlet 25 through the communication hole 25a.

The second cap 30 of this example is made of the same resin as that of the first cap 20.
As shown by, the bearing portion 33 is formed in the central portion, and the bearing portion 33 is connected to the second cap main body 31 and a plurality of connecting portions (four places in this example) 31a, and between the connecting portions 31a. , A communication hole 35a communicating with the flow path discharge port 35. The communication hole 35a of the present example is formed as an inclined surface that tapers outward (to the left in FIG. 1) as shown in FIG. The housing 4 is provided on the outer peripheral side of the communication hole 35a.
A fitting portion 32 for fitting with 0 is formed. An O-ring 73 is arranged on the fitting portion 32.

A flange portion 34 for connecting to a housing 40 described later is formed on the outer periphery of the second cap. A screw groove 34a into which a fastener 71 such as a bolt is screwed is formed at a predetermined position of the flange portion 34, and the fastener 71 such as a bolt is used to connect the second cap 30 and the housing 40 by using the screw groove 34a. It is assembled so that it becomes one. A flow path discharge port 35 is formed on one end side of the motor pump, which is opposite to the housing 40. A fluid is formed so that the fluid can flow from the flow path discharge port 35 through the communication hole 35a.

The housing 40 of this embodiment is composed of the first cap 2
0 and the second cap 30 are disposed between the flow path inlet 2
A connection path 41a is formed to connect 5 and the flow path outlet 35. That is, the housing 40 is formed with a hollow cylindrical housing case body 41, a stator core 42, a winding 43, and a flange portion 44, and the hollow of the housing case body 41 is formed as a connection path 41a. There is.

The wall of the housing case main body 41 is a double wall having a hollow portion 41b.
A stator core 42 having a winding 43 wound around 1b is arranged. The flange portion 44 is the housing case body 4
1 at predetermined outer peripheries on both end sides (that is, the first cap 20
And a position matching the respective flange portions 24 and 34 of the second cap 30), and the flange portion 44 is provided with a thread groove 44a. Further, a fitting portion 46 (upstream side) and a fitting portion 47 (downstream side) are formed at an end portion of the housing case body 41 of the present example on the side of the connection path 41a, and the fitting portion 46 has an O-ring. 72 are provided.

The rotor 50 of this example has a rotary shaft 51, a support member 52, a magnet yoke 53, and a magnet 54.
The mixed flow impeller 60 is attached to a predetermined portion of the rotary shaft 51.

In the rotor 50 of this embodiment, as shown in FIGS. 1 and 9, a hollow cylindrical support member 52 is fixed to a rotary shaft 51, and a magnet yoke 53 is attached to the outer periphery of the support member 52. The magnet 54 is attached to the magnet yoke 53. The support member 52 of this example is integrally connected to the rotary shaft 51 by the connecting portions 52a at both ends,
Inside the support member 52 is a hollow fluid flow path 52b. The rotor 50 is arranged with a gap from the wall of the housing case body 41 of the housing 40.

Both ends of the rotary shaft 51 are rotatably supported by bearings 23 and 33. A dynamic pressure groove 55 is formed on the outer periphery of the end of the rotary shaft 51 on the flow path intake side. The dynamic pressure groove 55 is composed of a first groove 55a and a second groove 55b, and the first groove 55a and the second groove 5 are formed.
5b has the same lead angle (lead angle), but the direction of the groove is opposite. The bearing portion 33 of this example has the same structure as the bearing portion 23.

Further, a concave portion is formed at an end portion of the rotary shaft 51 on the flow path intake side, and a hard ball 57 is mounted in the concave portion. The contact surface of the hard sphere 57 is the wall portion 23d of the first cap 20.
A communication hole 23c is formed on the outer periphery of the wall portion 23d.

As shown in FIGS. 2 and 3, the mixed flow impeller 60 of this example has a central body portion 61 having a trapezoidal cross section, a hole 64 into which a rotary shaft is inserted, and a predetermined portion from the central body portion 61. Four diagonal flow blades 62 radially formed uniformly based on a spiral
It is formed of a, 62b, 62c and 62d.

The mixed flow blades 62a, 62b, 62
The outer peripheral tips of c and 62d are connected by a tubular portion 65. The tubular portion 65 is formed so as to be close to the inner peripheral surface of the communication passage of the housing case. Specifically, as shown in FIGS. 2 and 3, the inwardly inclined surface 6
It has a ring shape with 5a. Further, the tubular portion 65 is formed with a guide portion 66 that is guided inward along the rotation direction. The guide portion 66 is formed of a spiral protrusion formed on the outer peripheral surface of the tubular portion 65.

A screw groove 61a is formed at one location in the central body 61 of the mixed flow impeller 60 perpendicularly to the rotary shaft 51. On the other hand, the attachment portion of the mixed flow impeller 60 to the rotating shaft 51 is formed to have a smaller diameter than the central main body portion to which the support member 52 is attached. And the mixed flow impeller 60
Is a fastener 7 such as a hexagon socket set screw or grooved set screw.
5 is screwed into the thread groove 61a, the rotary shaft 51
It is fixed to.

The attachment portion of the mixed flow impeller 60 on the rotary shaft 51 may be formed in a D-shaped cross section. in this case,
The mixed flow impeller 60 is fixed to the rotating shaft 51 such that the tip of the fixing member 75 contacts a flat surface portion having a D-shaped cross section. Thus, when the mixed flow impeller 60 is fixed to the rotating shaft 51,
Improves the attachment strength of the mixed flow impeller 60 to the rotating shaft 51,
It is possible to prevent the rotation shaft 51 from idling with respect to the mixed flow impeller 60.

The motor-pump 10 having the above-mentioned configurations is
The rotor 50 is fitted to the bearings 23 and 33 of the first cap 20 and the second cap 30, and the housing 4
The first cap 20 and the second cap 30 are fitted and fixed from both sides of 0. Housing 40 and first cap 2
0 is assembled through the O-ring 72 at the fitting portions 22c and 46, and the housing 40 and the second cap 30 is assembled through the O-ring 73 at the fitting portions 32 and 47 to prevent liquid leakage. And then the flange portions 24, 4
4, 34 and 34 are integrally assembled using the fastener 71.

Next, the motor pump 10 having the above structure.
The operation of will be described. When the motor is started by an external power supply (not shown), the rotor 50 rotates and the mixed flow impeller 60 attached to the rotating shaft 51 of the rotor 50 rotates. As a result, the liquid on the inlet side of the flow path is sucked. Since the central portion of the first cap 20 has a communication hole 25a as shown in FIGS. 1 and 10, the liquid carried by the mixed flow impeller 60 passes through the communication hole 25a.

Next, since the support member 52 of the rotor 50 also has the channel 52b as shown in FIGS. 1 and 9, the liquid flow passes through this channel 52b. Since the central portion of the second cap 30 on the outlet side also has the communication hole 35a as shown in FIGS. 1 and 8, the flow of the liquid flows through this communication hole 35.
Pass a. The pump is configured in this way, and the liquid is transported from the inlet side to the outlet side.

When the liquid is conveyed in this manner, the oblique flow blade 62 of the oblique flow impeller 60 has a ring-shaped cylindrical shape having an inwardly inclined surface as shown in FIGS. 2 and 3. Part 6
5 is formed, and a spiral of a ridge is formed on the outer peripheral portion of the tubular portion 65 as a guide portion 66 that is guided inward along the rotational direction. Therefore, the rotation of the mixed flow impeller 60 causes the H direction ( (See FIG. 3), it becomes possible to reduce the amount of liquid leaking from the gap between the tip of the mixed flow vane 62 and the inner surface of the housing 40. By reducing the leak in this way, the flow rate can be increased.・ It leads to an increase in pressure and improves the motor pump performance.

At this time, the oblique flow blade 62 of the oblique flow impeller 60
Does not make sliding contact with the housing 40, and there is no part that makes sliding contact with the inner surface of the housing 40, so durability is improved and axial torque can be reduced. As a result, the capacity of the motor can be reduced. Also,
In the mixed flow impeller 60, since the tubular portion 65 is formed on the outer periphery of the mixed flow blade 62 on the tip side, it is possible to improve the strength of the mixed flow blade 62.

FIG. 4, FIG. 5, FIG. 6, and FIG. 7 show other embodiments, and in these embodiments, the same reference numerals are given to the same members and parts as those in the above-mentioned embodiments. And its description is omitted.

(Other Embodiments) In the embodiment shown in FIG. 4, the cylindrical portion 6 formed on the mixed flow blade 62 of the mixed flow impeller 60 is used.
5 shows an example in which a spiral groove 67 is formed as a guide portion on the outer peripheral surface of No. 5. Thus, even if the guide portion is formed by the spiral groove 67 instead of the protrusion 66 of the above-described embodiment, it is possible to obtain the same effect as that of the above-described embodiment.

The embodiment shown in FIGS. 5 and 6 is
The wall surface 22a side of the first cap 20, that is, the tubular portion 6
5 shows an example in which a spiral protrusion 68 is formed on the inner peripheral surface of the connecting passage on the side of the opposing first cap 20 on the outer peripheral surface of No. 5. Even if formed in this way, the same operational effects as those of the above-described embodiment can be obtained.

Furthermore, the embodiment shown in FIG. 7 shows an example in which a spiral groove 69 is formed instead of the spiral projection 68 formed in FIGS. 5 and 6.

(Modification) In each of the above-described embodiments, an example in which a ridge and a groove are formed as the guide portion and each ridge and groove have a rectangular cross section is shown. The concave groove is not limited to have a rectangular cross section, and may have a triangular cross section or other shapes. Further, although the ridges / grooves are formed in a spiral shape in the tubular portion at regular intervals, the ridges / grooves may be formed at different intervals instead of at regular intervals. .

[0038]

As described above, according to the motor pump of the present invention, the outer peripheral portion of the tubular portion formed on the mixed flow vane is provided with the guide portion which is guided inward in the rotation direction. By this guide part, the flow of water is created by the rotation of the mixed flow impeller, and it becomes possible to reduce the amount of liquid that leaks from the gap between the tips of the vanes and the inner surface of the casing. This leads to increased pressure and improved pump performance.

At this time, since the impeller is not in sliding contact with the casing and there is no part in sliding contact with the inner surface of the casing,
The durability is improved and the shaft torque can be reduced. As a result, the capacity of the motor can be reduced. Further, since the tubular portion is formed on the outer periphery of the mixed flow blade, the strength of the blade can be improved.

As described above, according to the present invention, the motor pump is downsized and the durability is improved, and the leakage of the liquid between the mixed flow vanes and the casing is reduced to improve the performance. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a motor pump according to the present invention.

FIG. 2 is an explanatory diagram of an impeller viewed from the suction port side.

3A and 3B are a side view and a partially enlarged view of FIG.

FIG. 4 is a side view similar to FIG. 3 showing another example and an enlarged cross-sectional view of a portion A.

FIG. 5 is an explanatory diagram of a housing showing another example.

6 is a cross-sectional view taken along the line AA of FIG. 5 and an enlarged cross-sectional view of a main part.

FIG. 7 is a sectional view similar to FIG. 6 showing another example and an enlarged sectional view of an essential part.

8 is a partial sectional view taken along line BB of FIG.

9 is a partial cross-sectional view taken along the line CC of FIG.

10 is a partial cross-sectional view taken along the line DD of FIG.

11A and 11B show a conventional example, in which FIG. 11A is a longitudinal sectional view of a main part, and FIG. 11B is a partially enlarged sectional view taken along the line FF of FIG.

[Explanation of symbols]

10 Motor Pump, 20 First Cap, 21
Cap body, 21a connecting portion, 22 recessed space,
22a concave wall surface, 22c fitting portion, 23 bearing portion, 24 flange portion, 24a screw groove, 25
Flow path inlet, 25a communication hole, 30 second cap,
31 second cap body, 31a connecting portion, 32
Fitting part, 33 Bearing part, 34 Flange part, 34
a thread groove, 35 flow path discharge port, 35a communication hole,
40 housing case, 41 housing case main body, 41a connection path, 41b hollow part, 42 stator core, 43 winding wire, 44 flange part, 46
Fitting portion, 47 fitting portion, 50 rotor, 51 rotating shaft, 52 supporting member, 52a connecting portion, 52b
Flow path, 53 magnet yoke, 54 magnet, 55 dynamic pressure groove, 55a first groove, 55b second groove, 57 hard ball, 60 mixed flow impeller, 61 central body portion, 61a screw groove, 62, 62a, 62
b, 62c, 62d diagonal flow blades, 64 holes, 65 tubular portion, 65a inclined surface, 66, 67, 68, 69 guide portion, 71 fixing tool, 72, 73 O-ring, 75
Fastener

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04D 29/18 101 F04D 29/18 101

Claims (3)

[Claims] 1. A first cap having a flow passage inlet, a second cap having a flow passage outlet, and the first cap.
A housing case that is provided between the cap and the second cap and that has a connecting path that connects the flow path intake port and the flow path discharge port to form a stator, and a rotor that is disposed in the housing. And a mixed flow impeller, for feeding a fluid from the flow path inlet to the flow path outlet, wherein the stator is a core iron core provided on the outer periphery of the connection path of the housing case. A supporting member formed with a coil wound around the core iron core, the rotor being fixed to a rotating shaft rotatably supported and having a through hole formed therein, and the supporting member. The mixed flow impeller is formed by including a magnet formed on the outer periphery of the central flow path, the mixed flow impeller has a central main body integrated with a rotation shaft, a plurality of blades radially extending from the central main body, and A cylinder that connects the outer peripheral tips and is close to the inner peripheral surface of the communication path of the housing case And a guide portion that leads to the inside along the rotational direction on at least one of the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the communication path facing the outer peripheral surface of the cylindrical portion. Motor pump characterized by. 2. The motor pump according to claim 1, wherein the guide portion is a spiral-shaped protrusion or groove formed along a rotational direction from the flow path inlet to the flow path outlet. 3. The guide portion is provided on both the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the communication passage that faces the cylindrical outer peripheral surface. Motor pump.