WO1997024532A1

WO1997024532A1 - Pump assembly

Info

Publication number: WO1997024532A1
Application number: PCT/JP1997/000002
Authority: WO
Inventors: Makoto Kobayashi; Masakazu Yamamoto; Yoshio Miyake; Kaoru Yagi; Keita Uwai; Yoshiaki Miyazaki; Katsuji Iijima; Junya Kawabata
Original assignee: Ebara Corporation
Priority date: 1995-12-28
Filing date: 1997-01-06
Publication date: 1997-07-10
Also published as: BR9706924A; AU1210597A; AU706634B2; RU2166132C2; CN1206451A; CN1094178C

Abstract

A pump assembly for forcedly driving various liquids including water, comprising a motor pump provided with a space (40) around the stator (13) of a canned motor (6) to conduct a liquid being pumped, a bracket (45) mounted on an external surface of the motor pump, and a frequency converter assembly (50) mounted on the bracket (45).

Description

Description Pump assembly Technical field

The present invention relates to a pump assembly, and more particularly to a pump assembly on which a frequency converter is mounted. Background art

2. Description of the Related Art Conventionally, there has been known a pump assembly in which a frequency converter typified by Invar overnight is mounted on an electric motor and pump so that heat generated by the frequency converter is removed by a pump handling liquid. For example, in Japanese Patent Application No. 5-359094 (Japanese Unexamined Patent Application Publication No. Hei 7-189996), an inverter is mounted on the outer surface of a cylindrical outer cylinder of a full-circulation pump. An arrangement is disclosed.

In the pump assembly disclosed in Japanese Patent Application Laid-Open No. 7-189996, the heat sink for cooling the inverter is not required by attaching the inverter to the outer surface of the outer cylinder of the all-circulation pump. The size of the motor is reduced by increasing the frequency of the electric power supplied to the motor, and the size of the motor is reduced by increasing the speed of the pump. We are trying to reduce the size.

However, the pump assembly disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-189996 has the following problems.

① As shown in Fig. 1 of JP-A-7-189996, when the invar evening is mounted on the outer surface of the outer cylinder, the lower case (indicated by reference numeral 48 in Fig. 2) that accommodates the invar evening is It must have a special shape that matches the curvature of the outer cylinder. This means that an inverter with the same electrical characteristics can be mounted on an outer cylinder with a different curvature. This is inconvenient when attaching. For example, the pump shown in Fig. 1 of JP-A-7-189996 is a two-stage pump having two impellers. However, in some circumstances, a single-stage pump having a larger impeller outer diameter is used. It is necessary to shorten the axial dimension of the pump as a pump.

At this time, the outer diameter of the single-stage impeller is approximately 1.4 times the outer diameter of the impeller disclosed in Japanese Patent Application Laid-Open No. 7-189996. Therefore, in order to store the impeller in the outer cylinder, it is necessary to increase the diameter of the outer cylinder. In other words, several types of specially shaped lower cases are required to accommodate the Invera sunset.

② In the pump assembly shown in Fig. 1 of JP-A-7-189996, since the lower case is welded and fixed to the outer cylinder, the internal parts of the inverter are installed.

Installation of (board, etc.) cannot be performed until after the motor stator assembly is completed. Therefore, it was not possible to carry out the function verification test in Invera until the completion of the test, and it was time-consuming to reassemble if there was a defect in the test.

(3) In the pump assembly shown in Fig. 1 of JP-A-7-189996, if the pump becomes too small by increasing the rotation speed of the pump, it is not possible to secure the installation space for the inverter. . It is known that motors and pumps become smaller when the rotation speed is increased. On the other hand, the size of the inverter is independent of the rotational speed and is determined by its electrical capacity and cooling conditions.

The present invention has been made in view of the above circumstances, and can easily cope with a change in curvature of an outer cylinder constituting an outer surface of a motor pump, and can assemble a frequency converter assembly independently. It is an object of the present invention to provide a pump assembly that can easily attach a pump to a miniaturized motor pump. 97/24532

Disclosure of the invention

In order to achieve the above-described object, the present invention provides a motor pump having a space for guiding a liquid to be handled around the outer periphery of a motor, a bracket mounted on an outer surface of the motor pump, and a bracket mounted on the bracket. And a frequency converter assembly.

In the present invention, a bracket is provided between the frequency converter assembly and the pump outer cylinder. The bracket functions to adjust the mounting dimensions and is smaller than the base of the frequency converter assembly. Since the brackets are small parts, even if there are many types, the productivity will not be impaired.

The frequency converter assembly of the present invention includes a base mounted on a bracket, a cover mounted on the base, and a frequency converter main body surrounded by the base and the cover. As a result, the frequency converter assembly can be assembled independently. The cover and base do not need to be disassembled in principle, except for the case of independent maintenance of the frequency converter itself. That is, when the frequency converter is attached to and detached from the pump, the highly integrated circuit is not exposed to the outside. This configuration is effective because highly integrated circuits and electrical substrates are generally vulnerable to dust.

In one embodiment of the present invention, the bracket is provided with a hole for electrically connecting the module to the main body of the frequency converter. As a result, the assembly of the frequency converter assembly and the motor pump can be performed without any trouble.

In one embodiment of the present invention, the bracket, base and cover are each made of a good thermal conductor, particularly an aluminum alloy. Since this type of frequency converter is mainly cooled by the pump handling liquid, the use of aluminum alloy is preferred. Also, by using metal as the material, radiation noise from the frequency converter can be shielded. In particular, since the bracket is made of metal, harmonic noise on the secondary side of the frequency converter can be shielded. In one embodiment of the present invention, a hole is formed in the bracket to allow the coolant to pass therethrough. Usually, the frequency converter is cooled by the pump handling liquid. However, for example, if the pumped fluid is high, if the frequency converter such _c to be cooled failure, it may be provided with holes for cooling liquid passage in the bracket, the externally et separate coolant By passing the frequency converter, the frequency converter works without any trouble.

In one embodiment of the present invention, a heat transfer improving material is interposed in the gap between the motor pump and the bracket, the gap between the bracket and the base, or the gap between the base and the cover. If there is a gap between the members, air with poor heat transfer will intervene there, resulting in poor cooling. Therefore, a heat transfer improving material such as liquid silicon is interposed between the members.

In one embodiment of the present invention, a seal member for maintaining airtightness is provided between the motor pump and the bracket, between the bracket and the base, and between the base and the cover. As a result, there is no danger of water vapor entering the case and being cooled by the pump handling liquid and condensing, thereby damaging the frequency converter.

Further, the present invention provides a motor frame outer shell provided on an outer peripheral portion of a motor stator, an outer cylinder forming an annular space between the motor frame outer shell outer peripheral surface, and a liquid handled in the annular space. And a pump unit provided at an axial end of the outer cylinder and provided with fixing means for fixing another member, wherein a frequency converter assembly is fixed to an outer peripheral portion of the outer cylinder. A part of the frequency converter assembly is further extended in the axial direction than fixing means provided at an axial end of the outer cylinder.

In the present invention, fixing means for connecting the suction casing, the discharge casing and the like are provided at the end of the outer cylinder constituting the outer surface of the motor bomb. For this reason, conventional frequency converters do not work if the pump becomes too small. There was a problem that the mounting space was lost. In order to avoid the restriction on the mounting of the frequency converter by the fixing means, the frequency converter assembly is installed in a so-called raised floor type to avoid interference with the fixing means. BRIEF DESCRIPTION OF THE FIGURES

1 is a sectional view showing an embodiment of a pump assembly according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a pump assembly according to the present invention. FIG. 4 is a plan view showing a bracket in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a pump assembly according to the present invention will be described with reference to FIG. 1 and FIG.

The all circumferential flow type motor pump shown in the present embodiment includes a pump casing 1, a canister housed in the pump casing 1, and an end of a main shaft 7 of this canister 6. And an impeller 8 fixed to the section. The pump casing 1 includes a pump casing outer cylinder 2, a suction casing 3 connected to both ends of the pump casing outer cylinder 2 by flanges 61, 62, respectively, and a discharge casing 4. I have. The flanges 6 1 and 6 2 constitute fixing means for fixing other members such as the suction casing 3 and the discharge casing 4 to the outer cylinder 2. The outer casing 2, the suction casing 3, and the discharge casing 4 of the pump casing are formed of a sheet metal made of stainless steel or the like.

A bracket 45 is attached to the outer surface of the outer cylinder 2. The frequency converter assembly 50 is mounted on the bracket 45. The frequency converter assembly 50 includes a base 46 mounted on the bracket 45, a cover 47 mounted on the base 46, a base 46 and a cover 47. Therefore, the frequency converter main body 48 is enclosed.

The bracket 45 has a hole 45 a for electrically connecting the can motor 6 and the frequency converter body 48. The bracket 45, the base 46, and the cover 47 are each formed of a heat conductor made of an aluminum alloy. The bracket 45 has a coolant passage hole 45 b through which coolant for cooling the frequency converter body 48 is formed. On the other hand, Kandomomo 6 has a stator 13, a motor frame outer shell 14 provided on the outer periphery of the stator 13, and a motor frame outer shell 14. The motor frame side plates 15 and 16 are welded and fixed to the motor frame side plates 15 and 16 and the cans 17 are fitted to the inner peripheral portion of the stator 13 and welded and fixed to the motor frame side plates 15 and 16. ing. The rotor 18 rotatably accommodated in the stator 13 is shrink-fitted and fixed to the main shaft 7. An annular space (flow path) 40 is formed between the outer frame 14 and the outer cylinder 2 of the motor frame. A guide member 11 for guiding the fluid from the outside in the radial direction to the inside in the radial direction is held on the frame side plate 16 of the can module 6. An inner casing 12 for accommodating the impeller 8 is fixed to the guide member 11. In addition, a seal member 13 is interposed on the outer periphery of the guide member 11.

A liner ring 51 is provided at the inner end of the guide member 11, and the liner ring 51 slides on the front surface of the impeller 8 (on the suction mouth side). The inner casing 12 has a substantially dome shape, and has a shape that covers the shaft end of the main shaft 7 of the pump 6. The casing 12 has a guide device 12 a formed of a guide vane or a volume for guiding the fluid discharged from the impeller 8. The inner casing 12 has an air vent hole 12b at the tip.

The lead wire housing 20 is welded to the outer frame The lead wire is pulled out from the coil inside the outer frame 14 of the motor frame via the lead wire housing 20 and the holes 45 a of the bracket 45 and the lead of the base 46 are fixed. It is connected to the base 46 and the frequency converter body 48 in the force bar 47 via the wire extraction hole 46a. In addition, the lead wires of the frequency converter body 48 are connected to the power cable 63 within the base 46 and the cover 47. The outer cylinder 2 is formed with a hole 2a, and the lead wire housing 20 is inserted into the hole 2a.

Next, the bearing peripheral portion on the impeller 8 side will be described.

The bearing bracket 21 is provided with a radial bearing 22 and a fixed-side thrust bearing 23. The end face of the radial bearing 22 is also provided with a function as a fixed-side thrust sliding member. On both sides of the radial bearing 22 and the fixed-side thrust bearing 23, a rotating-side thrust bearing 24 and a rotating-side thrust bearing 25, which are rotating-side thrust sliding members, are provided. The rotating thrust bearing 24 is fixed to a thrust disk 26, and the thrust disk 26 is fixed to the main shaft 7 via a key. The rotating thrust bearing 25 is fixed to a thrust disc 27, and this thrust disc 27

Reference numeral 27 is fixed to the main shaft 7 via a key.

The bearing bracket 21 is inserted through an o-ring 29 made of an elastic material into a hollow provided on the module frame side plate 16. In addition, the bearing bracket 21 is in contact with the motor frame side plate 16 via a gasket 30 made of a conductive material. In the figure, reference numeral 31 denotes a sleeve that forms a sliding part with the radial bearing 22.

Next, the bearing peripheral portion on the side of the impeller 8 will be described.

The bearing bracket 32 is provided with a radial bearing 33. In the figure

Reference numeral 34 denotes a sleeve forming a sliding portion with the radial bearing 33.The sleeve 34 contacts the washer 35, and the washer 35 is provided at the end of the main shaft 7. And fixed by double nuts 36. The bearing bracket 32 is inserted into an inlay provided on the motor frame side plate 15 via a ring 37 made of an elastic material. The bearing bracket 32 is in contact with the motor frame side plate 15.

A stay 43 is welded to the outer frame 14 of the motor frame, and the stay 43 and the outer cylinder 2 are fixed by welding. The number of revolutions of the CAN mode 6 is set to 400 rpm or more by the frequency converter body 48.

The operation of the all-circumferential pump shown in FIG. 1 will be briefly described. The fluid sucked from the suction nozzle 3a connected to the suction casing 3 passes through the suction casing 3 and passes through the outer cylinder 2. And flows into an annular flow path 40 formed between the outer frame 14 and the motor frame 14 of the candies 6, and is guided by the guide member 11 through the flow path 40 to be impeller 8. Guided inside. The fluid discharged from the impeller 8 is discharged from the discharge nozzle 4a connected to the discharge casing 4 via the guide device 12a.

In this embodiment, a bracket 45 is provided between the frequency converter assembly 50 and the pump casing outer cylinder 2. The bracket 45 functions to adjust the connection dimensions, and is set to be smaller than the pace 46 of the frequency converter assembly 50. Since the brackets 45 are small components, their productivity will not be impaired even if their types are increased.

As shown in FIG. 1, two fixing members 53 on which bolts 52 are implanted are fixed to the outer cylinder 2 by welding at predetermined intervals. On the other hand, the bracket 45 has cutouts 45c at both ends as shown in FIG. The bracket 45 is fixed to the outer cylinder 2 by fitting the notches 45 c at both ends to the fixing member 53 and then tightening the nut 54 to the bolt 52. I have. Next, a method of fixing the frequency converter assembly 50 to the motor and pump will be described.

First, the frequency converter body 48 is housed in the base 46 and the cover 47, and the frequency converter assembly 50 is assembled independently. After assembling the frequency converter assembly 50, the bracket 45 and the frequency converter assembly 50 are fixed. This fixing is performed by tightening bolts 55 from the bracket 45 side to the base 46 of the frequency converter assembly 50 as shown in FIG. Can be implemented externally. After fixing the bracket 45 and the frequency converter assembly 50, the notch 45c of the bracket 45 is fitted to the fixing member 53, and the nut 54 is tightened to the bolt 52. As a result, the bracket 45 is fixed to the outer cylinder 2 of the motor pump. Thus, the frequency converter assembly 50 is surrounded by the base 46 attached to the bracket 45, the cover 47 attached to the base 46, the base 46 and the cover 47. And a frequency converter body 48. As a result, the frequency converter assembly 50 can be assembled independently. The fixing of the bracket 45 and the frequency converter assembly 50 can be performed outside the frequency converter assembly 50. Further, after fixing the bracket 45 and the frequency converter assembly 50, the bracket 45 and the outer cylinder 2 of the motor pump can be fixed. The cover 47 and the base 46 do not need to be disassembled in principle, except for the case where the frequency converter body 48 is solely maintained. That is, when the frequency converter is attached to and detached from the pump, the highly integrated circuit is not exposed to the outside. This configuration is effective because highly integrated circuits and electrical substrates are generally vulnerable to dust and dust.

In this embodiment, the bracket 45 is provided with a hole 45a in order to electrically connect the CAN module 6 and the frequency converter body 48 electrically. As a result, assembly of the frequency converter assembly 50 and the motor pump can be performed without any trouble. You.

In the present embodiment, the bracket 45, the base 46, and the cover 47 are each made of a good thermal conductor, particularly an aluminum alloy. Since this type of frequency converter is mainly cooled by the liquid handled by the pump, the use of an aluminum alloy is preferred. In addition, by using metal as a material, radiation noise from the frequency converter can be shielded. In particular, since the bracket is made of metal, harmonic noise on the secondary side of the frequency converter can be shielded.

Further, in this embodiment, a coolant passage hole 45 b for passing the coolant through the bracket 45 is formed. Usually, the frequency converter is cooled by the pump handling liquid. However, for example, when the temperature of the handled liquid is high, the frequency converter becomes poorly cooled. In such a case, the frequency converter can be cooled sufficiently by providing a hole 45b for coolant passage in the bracket 45 and letting another coolant pass from outside. Works without hindrance.

In this embodiment, the heat transfer improving material is inserted into the gap between the outer cylinder 2 of the motor pump and the bracket 45, the gap between the bracket 45 and the base 46, or the gap between the base 46 and the cover 47. Is interposed. If there is a gap between the members, poor heat transfer will be interposed between them, resulting in poor cooling. Therefore, a heat transfer improving material such as liquid silicon is interposed between the members. In the present embodiment, airtightness is provided between the outer cylinder 2 of the motor pump and the bracket 45, between the bracket 45 and the base 46, and between the base 46 and the power bar 47. The holding sealing members 56, 57, 58 are provided. As a result, there is no danger that water vapor will enter the case accommodating the frequency converter body 48, and this water vapor will be cooled and dewed by the pump handling liquid, thereby damaging the frequency converter.

Further, in this embodiment, the outer frame 14 of the motor frame provided on the outer periphery of the stator 13 of the canned motor 6 and the outer peripheral surface of the outer frame 14 of the motor frame are provided. An outer cylinder 2 forming an annular space 40 between the outer cylinder 2, a pump section including an impeller 8 for guiding the liquid to be treated into the annular space 40, and a suction port provided at an axial end of the outer cylinder 2. In a pump assembly provided with a fixing means consisting of flanges 61 and 62 for fixing other members such as the sink 3 and the discharge casing 4, The frequency converter assembly 50 is fixed, and a part of the frequency converter assembly 50 is extended in the axial direction from fixing means (61, 62) provided at the axial end of the outer cylinder 2. It has the following configuration.

As described above, in the present embodiment, fixing means including flanges 61 and 62 for connecting the suction casing 3 and the discharge casing 4 are provided at the end of the pump casing outer cylinder 2. Can be For this reason, the conventional frequency converter has a problem that if the pump is too small, there is no space for installation. In order to avoid the restriction on the mounting of the frequency converter by the fixing means, the frequency converter assembly 50 has a so-called raised floor structure to avoid interference with the fixing means comprising the flanges 61, 62. ing. As a result, a part of the frequency converter assembly 50 can be extended in the axial direction more than the fixing means.

As described above, according to the present invention, each of the inverter, the motor, and the pump can be reduced in size, and an extremely small pump assembly can be configured as a whole.

Further, according to the present invention, it is easy to cope with a change in the curvature of the outer cylinder constituting the outer surface of the motor pump, the frequency converter assembly can be assembled independently, and the frequency converter assembly is downsized. Can be easily attached to the overnight pump. Industrial applicability

The present invention applies both pressure and velocity energy to the liquid by rotation of the impeller, A pump assembly that converts the velocity energy into pressure energy as efficiently as possible while passing through the casing and sends the liquid from a low place to a high place. It is capable of pumping various liquids including water. It can be used in the chemical industry.

Claims

The scope of the claims

1. A motor pump provided with a space for guiding the liquid to be handled on the outer periphery of the stator of the motor, a bracket mounted on the outer surface of the motor pump, and a frequency converter assembly mounted on the bracket. A pump assembly comprising:

2. The frequency converter assembly includes a base attached to the bracket, a cover attached to the base, and a frequency converter body surrounded by the base and the cover. The pump assembly according to claim 1, wherein:

3. The pump assembly according to claim 1, wherein a hole for electrically connecting the motor and the frequency converter main body is provided in the bracket.

4. The pump assembly according to any one of claims 1 to 3, wherein the bracket is made of a good heat conductor.

5. The pump assembly according to any one of claims 2 to 4, wherein the base is made of a good heat conductor.

6. The pump assembly according to any one of claims 2 to 5, wherein the cover is made of a good heat conductor.

7. The pump assembly according to any one of claims 4 to 6, wherein the thermal conductor is an aluminum alloy.

8. The motor pump comprises: a motor frame outer cylinder provided on the outer periphery of a motor stator; an outer cylinder forming an annular space between the motor frame outer cylinder; And a pump section for guiding the liquid, and a power connection means for driving the motor is provided on the outer surface of the outer cylinder.The method according to any one of claims 1 to 7, wherein Pump assembly. - 】 Four -

9. The pump assembly according to any one of claims 1 to 8, wherein the bracket has a coolant passage hole for cooling a frequency converter.

10. The heat transfer improving material is interposed in a gap between the motor pump and the bracket, a gap between the bracket and the base, or a gap between the base and the power bar. The three-dimensional pump assembly according to any one of the nine items.

11. A sealing member for maintaining airtightness is provided between the motor pump and the bracket, between the bracket and the base, and between the base and the cover. The pump assembly according to any one of items 0 to 3D.

12. The fixing of the bracket and the frequency converter assembly may be performed outside the frequency converter assembly three-dimensionally, any one of claims 1 to 11 characterized by the above-mentioned. A pump assembly according to claim 1.

13. The bracket, the frequency converter assembly, and the bracket, the software, and the motor pump can be fixed after fixing the bracket or the frequency converter assembly according to any one of claims 1 to 12. A pump assembly according to claim 1.

14. An outer frame formed around the outer periphery of the stator of the motor and an outer cylinder forming an annular space between the outer surface of the outer frame of the motor and the outer space. In a pump assembly provided with a pump portion for guiding a liquid to be handled and a fixing means provided at an axial end of the outer cylinder for fixing another member,

A frequency converter assembly is fixed to an outer peripheral portion of the outer cylinder, and a part of the frequency converter assembly is extended in an axial direction from fixing means provided at an axial end of the outer cylinder. And the pump assembly.

15. The pump assembly according to claim 14, wherein the rotation speed of the pump is equal to or greater than 4 OO Orpm.