JP2857407B2 - Explosion-proof canned motor with inverter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an explosion-proof canned motor with an inverter in which the inverter is formed in an explosion-proof structure integrated with a canned motor.

(Conventional technology) A canned motor pump with a completely leak-free structure without a shaft seal is most suitable for sending chemical liquids and liquefied gas, etc., which are extremely unlikely to leak outside. Since many liquefied gases and the like have explosive properties, explosion-proof canned motor pumps are often used.

By the way, with the recent development of inverters, in order to control the pump discharge flow rate and discharge pressure, instead of the means for changing the flow path resistance with the electric control valve, the means for changing the pump rotation speed with the inverter is required for equipment cost and cost. Since the operating cost is low, it is gradually adopted.

(Problems to be Solved by the Invention) However, when an explosion-proof canned motor pump is driven by an inverter, the conventional inverter is installed in a non-hazardous location far from a gas vapor hazardous location (hereinafter referred to as a hazardous location). Therefore, it is extremely inconvenient to perform on-site operations in a hazardous area where a canned motor pump is installed.In addition, the inverter must not only be adapted to the characteristics of the canned motor pump but also have a large capacity in terms of equipment costs and operating costs. It is desired to select an optimal one which is not excessively large and does not have a function unnecessary for the operation of the canned motor pump, but the selection operation is complicated and requires specialized knowledge, so that the burden on the user is large.

Further, in order to detect the bearing wear state of the canned motor pump, when providing the rotating electric machine monitoring device described in JP-B-58-54580 to the canned motor,
Two detection coils are provided on the stator core of the canned motor at a pole pitch or an integer multiple thereof, and the relative position between the two detection coils and the rotor groove of the rotor core facing each other with a magnetic gap therebetween is a radius. As in the case of the axial gap type canned motor, in the axial gap type canned motor, the groove pitch of the rotor groove differs by 0.5,
The number of the rotor grooves is determined, and with respect to the fundamental voltage synchronized with the power supply frequency generated in both the detection coils and the harmonic voltage having the frequency determined by the number of the rotor grooves, the fundamental wave voltages cancel each other, In addition, both detection coils are connected in series so that the difference between the instantaneous values of the harmonic voltage is detected in the radial gap type canned motor, and the sum of the instantaneous values of the harmonic voltage is detected in the axial gap type canned motor. If a canned motor operation monitoring device is connected and configured as a detection unit, the output signal of the detection unit greatly changes due to the difference in the output waveform and carrier frequency of the inverter,
Since the detection sensitivity is greatly reduced or detection is not possible, the selection range of the inverter is narrowed and limited.Therefore, there are many cases where an inverter having excessive capacity or having an unnecessary function must be selected. Equipment costs and operating costs are high.

As means for detecting the rotation direction of the canned motor pump whose rotating part is not exposed to the outside, Japanese Patent Publication No. 59-31
As described in Japanese Patent Publication No. 290, a phase detection circuit built in the canned motor is connected to a power terminal of the canned motor, and the magnitude of the output voltage of the phase detecting circuit changes according to the phase sequence of the commercial power applied to the power terminal. Is used in many canned motor pumps, but this rotation direction detection device using a phase detection circuit for commercial power cannot be applied to an inverter power supply. Therefore, a new phase detection circuit must be prepared for the inverter power supply, but a dedicated phase detection circuit is required every time the output waveform and carrier frequency of the inverter are different. Changing the output frequency or the output voltage of the inverter also changes the output voltage of the phase detection circuit, which is not practical.

There is also an explosion-proof inverter in which only the inverter is placed in an explosion-proof container. In this case, however, the power supply-explosion-proof inverter (terminal room-inverter-terminal room)-canned motor (terminal room) is connected via a terminal room. This requires many wirings, increases the cost of the equipment and the wiring work, and there is a problem that wiring mistakes are likely to occur.

In addition to the canned motor pump, there is a similar problem in other wind-hydraulic machines using an explosion-proof canned motor driven by an inverter, such as a canned motor stirrer and a canned motor blower.

The present invention has been made to solve the problems,
Explosion-proof structure with integrated inverter and canned motor.By selecting and incorporating the most suitable inverter for canned motor, on-site operation can be performed in danger areas where canned motor is installed. It is an object of the present invention to provide an explosion-proof canned motor with an inverter that can reduce the cost of equipment and operation, and prevent incorrect connections, by relieving the user of the burden of selecting and wiring the inverter, which is heavy.

According to a first aspect of the present invention, there is provided an explosion-proof canned motor with an inverter, comprising: a canned motor pressure-resistant container having a stator chamber; and a stator disposed in the stator chamber of the canned motor pressure-resistant container. A canned motor, an inverter pressure vessel integrally connected to the canned motor pressure vessel, and an inverter chamber communicated with the stator chamber, a stator chamber of the canned motor pressure vessel and an inverter chamber of the inverter pressure vessel. And an inverter disposed in the inverter chamber of the inverter pressure-resistant container and connected to the stator through the communication to control the canned motor.

An explosion-proof canned motor with an inverter according to a second aspect is the explosion-proof canned motor with an inverter according to the first aspect, in which a communication between the stator chamber and the inverter chamber is cut off and a lead wire for connecting the stator and the inverter. It has a body.

An explosion-proof canned motor with an inverter according to claim 3 is the explosion-proof canned motor with an inverter according to claim 1 or 2, wherein the inverter has a metal heat sink for at least a part of the inverter. The metal heat sink is abutted and attached to the inner wall of the inverter pressure-resistant container, and a cooling jacket chamber through which a coolant flows is formed on the outer wall side.

An explosion-proof canned motor with an inverter according to claim 4 is the explosion-proof canned motor with an inverter according to claim 1 or 2, wherein the inverter has a metal heat sink for at least a part of the inverter. The inverter pressure-resistant container is provided with a fan motor provided in the inverter room and a rotating shaft of the fan motor protruding outside the inverter pressure-resistant container by forming a fire escape prevention gap with the inverter pressure-resistant container. A cooling motor fan having a fan mounted at an end; and
Cooling fins protrude from the outer wall side of the inverter pressure-resistant container that is forcibly cooled by the cooling motor fan, and the metal radiator plate is attached and attached to the inner wall.

(Function) In the explosion-proof canned motor with the inverter according to the first aspect, the explosion-proof structure in which the inverter is integrated with the canned motor enables the product to be selected and incorporated into the most suitable inverter for the canned motor. On-site operations can be performed in danger areas where the motor is installed,
The present invention relieves the user of the burden of selecting and wiring the inverter, which is cumbersome and requires specialized knowledge, thereby reducing equipment and operating costs and preventing incorrect connections.
Therefore, for example, when a canned motor operation monitoring device that detects a bearing wear state by a detection coil wound on a stator of the canned motor is provided, its function is hardly impaired, and the rotation of the canned motor regardless of the connection order of the commercial power supply. The direction is always constant, the rotation direction detecting device is not required, and the wiring work is easy.

In the explosion-proof canned motor with the inverter according to the second aspect, in addition to the operation of the explosion-proof canned motor with the inverter according to the first aspect, the stator chamber and the inverter chamber are shut off from each other by the lead-in lead body. For example, it is possible to prevent the inverter from abnormally rising in temperature or causing corrosion or deterioration of insulation due to high temperature air in the stator chamber or volatile components of the insulating varnish impregnated in the stator into the inverter chamber, thereby preventing a failure.

In the explosion-proof canned motor with an inverter according to claim 3, in addition to the operation of the explosion-proof canned motor with inverter according to claim 1 or 2, at least a part of the metal constituting the inverter is formed on the inner wall of the inverter pressure-resistant container. A heat radiating plate is abutted and attached, and a cooling jacket chamber through which a cooling liquid flows is formed on the outer wall side to cool an inverter having an explosion-proof structure.

In the explosion-proof canned motor with the inverter according to the fourth aspect, in addition to the operation of the explosion-proof canned motor with the inverter according to the first or second aspect, cooling fins are provided on the outer wall side of the inverter pressure-resistant container that is forcibly cooled by the cooling motor fan. At the same time, the metal radiator plate of at least a part of the inverter is abutted and attached to the inner wall to cool the inverter having an explosion-proof structure.

(Example) Next, an example of the first invention will be described with reference to the drawings.

1 to 3 show an embodiment in which the first invention is applied to a radial gap type canned motor pump.

Reference numeral 1 denotes a canned motor pump in which a pump 2 and a canned motor 3 are integrally formed in a liquid-tight manner. A stator 6 formed by winding a stator winding 5 around a stator core 4 is inserted and fixed in a stator frame 7. , The stator can 8 is closely inserted into the inner peripheral surface of the stator 6,
Both end edges of the stator can 8 are hermetically welded to inner peripheral edges of both end flange portions 7a and 7b of the stator frame 7 to constitute a canned motor pressure-resistant container 9, that is, the stator frame 7 and the stator can 8 The stator 6 is arranged in a stator chamber 10 formed by a canned motor pressure-resistant container 9 formed of a stator can, and a rotor chamber 11 formed inside the stator can 8 has a rotor 12 opposed to the stator 6.
The rear bearing box which also serves as the front bearing box 13 and the end cover
A front shaft 15 fixed to the rotor 12 is supported by a front bearing 15 and a rear bearing 16 mounted on the shaft 14, respectively.
Impeller installed in pump casing 18 at the tip of 17
Attach 19

Further, a part of the pump handling liquid on the pump discharge port 20 side flows into the canned motor rear chamber 23 through the circulation pipe 22 due to the pressure difference between the pump discharge port 20 side and the pump suction port 21 side, and the rear bearing 16 And cools the stator 6 and the rotor 12 from the rear rotor chamber 11b through the can gap 25 between the stator can 8 and the rotor can 24 to reach the front rotor chamber 11a. After lubricating the bearing 15, a circulation path is formed to return to the pump suction port 21 side through the balance hole 26 of the impeller 19 to form a circulation path for circulation, and is formed on the flange portion 28 a of the terminal support 28 protruding from the stator frame 7. A terminal box 31 is fastened and fastened with bolts 32 via a lead-in body 30 of a pressure-resistant stud type lead-in type terminal board 29, and the fire escapes to a fitting portion between the flange portion 28a of the terminal receiving stand 28 and the terminal box 31. The prevention gap 33 is formed.

34 is drawn into the terminal box 31 through a lead-in wire 36 by a pressure-resistant packing type packing 35, so that the terminal plate 29
Reference numeral 37 denotes a commercial power cable connected to the terminal box side terminal 29a, and a terminal cover 37 formed with a fire escape prevention gap 38 formed in the terminal box 31.

The above configuration is the same as the configuration of the conventional explosion-proof canned motor pump.

In this embodiment, a metal inverter box 39 and an inverter lid 40 are fastened with bolts 41 to form a flame escape prevention gap 42 on the joint surface thereof. In the formed inverter room 44, a strong electric circuit
An inverter 48 is formed by housing an inverter body 47 composed of a circuit 45 and a weak electric circuit 46, and one end of a connection pipe 49 as a communication part is hermetically welded to the stator frame 7 and the other end to the inverter box 39, respectively. The canned motor 3 and the inverter 48 are mechanically integrally connected, and the stator room 10 and the inverter room 44 are combined.
The lead wire 50 of the stator 6 is guided through the connection pipe 49 to the inverter room 44 to be connected to the output side 51 of the inverter body 47, and the lead wire connected to the terminal receiving terminal 29b of the terminal plate 29. 52 is led to the inverter room 44 through the inside of the stator room 10 and the inside of the connection pipe 49, and is connected to the input side 53 of the inverter main body 47.

In addition, a start / stop switch 54 and an output frequency setting volume 55, and an indicator 56 having an explosion-proof structure for indicating the inverter output frequency and the content of a failure are attached to the inverter lid 40.

Furthermore, when remote control is also performed, as shown by a chain line, an operation unit that is installed in a non-hazardous area to start and stop the inverter and set the inverter output frequency, and an indicator that indicates the inverter output frequency and the content of the fault, A terminal box 57 for connecting to the inverter body 47 is provided on the inverter box 39.

In conventional inverters that do not employ an explosion-proof structure, a metal radiator plate that generates a large amount of heat, such as a turn-off element or a rectifier element of a high-power circuit, is attached to the cooling fins, and natural air cooling by outside air is used. Alternatively, the cooling fins are cooled by forced air cooling by blowing outside air with a cooling motor fan, and the parts other than the metal radiator plate of the large heat-generating parts and the low heat-generating parts such as the weak electric circuit pass through the inverter box by natural convection. Although the air is cooled by the outside air flowing into and out of the inverter chamber through the pores, the outside air does not flow into and out of the inverter chamber 44 formed by the inverter pressure-resistant container 43 in order to adopt an explosion-proof structure. Since there is a fear that the temperature of the inverter rises and the malfunction of the inverter 48 is induced, it is necessary to take special cooling means.

Therefore, in this embodiment, the inverter body 47
A metal heat sink 58a of a component 58 having a large amount of heat, such as a turn-off element or a rectifying element of the high-power circuit 45, is attached to the inner wall 39a of the inverter box 39, and the coolant flows to the outer wall 39b side. A cooling jacket chamber 59 is formed, that is, a jacket lid provided with a cooling liquid inlet 61 and a cooling liquid outlet 62 in a jacket frame 60 protruding from the outer wall 39b of the inverter box 39 corresponding to the component 58 generating a large amount of heat. Body 62 is attached via gasket 64 to form cooling jacket chamber 59.

Further, a canned motor operation monitoring device 65 based on the invention described in Japanese Patent Publication No. 58-54580 is provided to detect the bearing wear state of the canned motor pump 1. That is, the stator core 4 of the canned motor 3 is targeted. Two detection coils 66a and 66b are provided at the positions, and these two detection coils 66a and 66b and the rotor groove 69 of the rotor core 68 facing each other with the magnetic gap 67 therebetween are located in the same position. Rotor groove
Even number 69 is provided, and fundamental wave voltages synchronized with the inverter output frequency generated in both detection coils 66a and 66b are mutually canceled, and the instantaneous value of the harmonic voltage having a frequency determined by the number of rotor grooves 69 is determined. An explosion-proof structure in which both detection coils 66a and 66b are connected in series to form a detection unit 70 so that the difference is detected, and the output terminals 70a and 70b of the detection unit 70 are attached to the terminal box 31. A total of 72 are connected via the terminal plate 29.

According to the embodiment configured as described above, the canned motor 3 and the inverter 48 that drives the canned motor 3 are mechanically integrally connected and the stator chamber 10 and the inverter chamber 44 are communicated with each other so that the stator 6 and the inverter By connecting the output side 51 of the main body 47 to the explosion-proof structure by integrally forming, the on-site operation can be performed in a danger area where the canned motor pump 1 is installed. Since the inverter 48 is integrally formed with the canned motor 3, the inverter 48 has functions that are suitable for the characteristics of the canned motor pump 1, are not excessively large in capacity, and are unnecessary for the operation of the canned motor pump 1. Since the optimum inverter body 47 is selected and incorporated,
The user is relieved from the burden of selecting an inverter which is cumbersome and requires specialized knowledge, and the equipment cost and operation cost are reduced.

Also, in the case where a CAD motor operation monitoring device 65 for detecting a bearing wear state by the detection coils 66a and 66b wound around the stator core 4 is provided, the CAN motor operation monitoring device may be used.
The inverter body 47 with the output waveform and carrier frequency that hardly impairs the functions of the 65 can be selected and built into the product.
Select an inverter that greatly reduces the detection sensitivity of the 65 or makes it undetectable, or select an inverter that has an output waveform or carrier frequency that does not impair the function of the canned motor operation monitoring device 65 Therefore, there is no danger that an inverter having an excessive capacity or having an unnecessary function for operating the canned motor pump must be selected.

Further, since the stator 6 of the canned motor 3 and the output side 51 of the inverter main body 47 can be connected in advance,
There is no need to provide a means for detecting the rotation direction of the canned motor pump 1.

That is, even if the connection order of the commercial power supply cable 34 connected to the terminal board 29 is changed to change the phase order of the commercial power supply applied to the input side 53 of the inverter body 47, the output side 51 Does not change, and the rotation direction of the canned motor 3 does not change unless the connection order of the lead wire 50 of the stator 6 to the inverter main body 47 is changed. When connecting the canned motor 3 to the output side 51 of the terminal board 29 in consideration of the order in which the canned motor 3 rotates forward, regardless of the order of connection of the commercial power cable 34 to the terminal plate 29, Pump 1
Always rotates forward, so there is no need to provide a means for detecting the direction of rotation.
After paying attention to the order of connection to the terminal plate 29 and temporarily connecting the commercial power cable 34, the canned motor pump 1 is operated to rotate its rotation direction by a built-in phase detection circuit like a conventional canned motor pump. Detected by a direction detection device, or if this rotation direction detection device is not provided, it is determined from the pump discharge pressure and flow rate and operating current and vibration noise, etc. No work is required, and wiring work becomes extremely easy.

In addition, by flowing a cooling liquid such as cooling water into the cooling jacket chamber 59, a component 58 having a large amount of heat generated by the strong electric circuit 45 abutting and attached to the inner wall 39a of the inverter box 39 corresponding to the cooling jacket chamber 59. Is strongly cooled by heat conduction through the metal inverter box 39, and a gold-heated inverter pressure-resistant container consisting of the inverter box 39 and the inverter lid 40
43 is cooled by heat conduction.
Since the air in contact with the inner wall of 43 is cooled and the entire inverter chamber 44 is cooled by the convective heat transfer, the inverter 48 does not malfunction due to abnormal temperature rise.

The volatile components of the insulating varnish impregnated in the stator 6 of the canned motor 3 penetrate into the inverter chamber 44, and cause corrosion and insulation deterioration in the weak current circuit 46 of the inverter main body 47 and a portion where a weak current flows, such as a connector portion thereof. If there is a fear of causing an inverter failure, as shown in FIG. 4, the weak electric circuit 46 and its connector section may be covered with a resin mold 72, or according to a second invention described later.

Also, as shown in FIG. 4, if the terminal box 31 is provided not on the stator frame 7 side but on the inverter box body 39 side, as in the embodiment shown in FIG. This eliminates the need for a complicated operation in which the lead-in wire 52 must be led to the inverter room 44 through the inside of the stator room 10 and the inside of the connection pipe 49 for connection with the input side 53.

When it is necessary to cool the canned motor 3 from the outside due to the high temperature of the pump handling liquid of the canned motor pump 1, a cooling jacket chamber 73 is provided outside the stator frame 7 as shown in FIG. It is convenient to provide the cooling liquid flowing out of the cooling jacket chamber 59 of the inverter 48 into the cooling jacket chamber 73 of the canned motor 3 so as to also serve as the cooling liquid.

Further, as means for mechanically integrally connecting the canned motor 3 and the inverter 48, as in the embodiment shown in FIG. 1, one end of the connection pipe 49 is connected to the stator frame 7 and the other end is connected to the inverter box 39. As shown in FIG. 4, a flange 49a is provided at the other end of the connection pipe 49 hermetically welded to the stator frame 7, and an inverter box body is provided at the flange 49a.
39 may be fastened and joined by bolts 75 so as to form a flame escape prevention gap 74 in the joint fitting portion.

Alternatively, as shown in FIG.
A part of the pump handling liquid in the pump rear chamber 77, which has a pressure close to the pressure on the pump discharge port 20 side, is
13 flows into the front rotor chamber 11a from the through-hole 78, a part of which lubricates the front bearing 15 and returns to the pump suction port 21 side through the balance hole 26 of the impeller 19, and the remainder is the can gap. twenty five
Cool the stator 6 and rotor 12 through the rear rotor chamber
11b, after lubricating the rear bearing 16 and then forming a circulation path by so-called intra-axial circulation, which returns from the canned motor rear chamber 23 to the pump suction port 21 through the axial passage 76 and circulates, The rear end flange portion 7b of the stator frame 7 is enlarged in diameter, and a rear bearing box 14 also serving as an end cover is welded in a liquid-tight manner on the inner diameter side to serve also as the inverter cover 40. An inverter box 39 is provided at the enlarged diameter portion of the rear end flange portion 7b of the stator frame 7, and a flame escape prevention gap is provided at a joint fitting surface thereof.
The inverter 48 was mechanically integrally connected to the rear end of the canned motor 3 by fastening and joining with bolts 41 so as to form 42, and the inverter 48 was bored in the rear end flange 7b of the stator frame 7. The stator room 10 and the inverter room 44 may be connected to each other through a conductor through hole 79 as a communication portion.

Furthermore, a canned motor pump 1 that employs in-shaft circulation
In the case where the stator can is small, as shown in FIG. 6, the stator can 8 is formed in a cup shape, the stator frame 7 is extended farther rearward than the stator can 8, and the extended portion is connected to the inverter box. The inverter lid 40 is also provided on the rear end flange portion 7b of the stator frame 7 which is also used as the body 39 and is also used as the inverter box 39 with bolts 41 so as to form a flame escape prevention gap 42 on its joint fitting surface. Even if it is fastened, it is possible to mechanically integrally connect the canned motor 3 and the inverter 48 and to connect the stator chamber 10 and the inverter chamber 44 with each other.

In this case, as shown in FIG.
It is preferable to provide a cooling jacket chamber 80 which serves to cool the inverter and the inverter 48.

The cooling of the inverter 48 is performed not only by liquid cooling by the cooling jacket chamber 59 or 80 as in the embodiments shown in FIGS. 1, 4 and 6, but also by the inverter chamber 44 as shown in FIG. The fan motor 82 of the cooling motor fan 81 is built in, and the rotation shaft 83 of the fan motor 82 is connected to the inverter box 39.
A flame escape prevention gap 84 is formed at the projecting end of the rotating shaft 83 so as to be attached to the fan 85 of the cooling motor fan 81 at the projecting end of the rotating shaft 83. The cooling fins 86 are protruded and the fan cover 87 is attached, and forced air cooling means can be adopted. Further, although not shown, when the canned motor 3 has a considerably small output, the heat generated by the Therefore, sufficient cooling can be obtained only by increasing the heat radiation area of the cooling fins 86 without providing the cooling motor fan 81.

The indicator 71 of the canned motor operation monitoring device 65 is
In addition to being attached to the terminal box 31 as in the embodiment shown in FIG. 1 and FIG. 5, a manual changeover switch (not shown) or an inverter output frequency and canned like the embodiment shown in FIG. 4 and FIG. By providing an automatic switching circuit for alternately displaying the indication value of the detection unit 70 of the motor operation monitoring device 65 at a constant cycle, the indicator can also be used as the indicator 56 for indicating the inverter output frequency and the content of the fault.

 Next, an embodiment of the second invention will be described.

FIG. 7 shows an embodiment in which the second invention is applied to a radial gap type canned motor pump. In the embodiment shown in FIG. 4 of the first invention, a pressure-resistant stud type is provided on a flange portion 49a of a connecting pipe 49. The inverter box 39 is fastened and joined with the bolts 75 via the lead-in body 89 by the lead-in type terminal board 88, and the stator chamber 10 and the inverter chamber 44 are connected and disconnected from each other by the lead-in body 89. , Terminal board side terminal 88a of terminal board 88
And the other end of the drop wire 52a connected to the inverter room side terminal 88b of the terminal plate 88 is connected to the output side 51 of the inverter body 47, that is, through the lead wire 89. The stator 6 is connected to the output side 51 of the inverter body 47.

The flange 49a of the connection pipe 49 and the inverter box 39
Of course, a flame escape prevention gap 74 is formed on the joint fitting surface with the above.

According to this embodiment, similarly to the first invention, the inverter 48 has an explosion-proof structure integrally formed with the canned motor 3, and the optimal inverter 48 is selected and incorporated in the canned motor pump 1. Since it can be made into a product, on-site operation can be performed in a danger area where the canned motor pump 1 is installed, and remote control similar to the conventional operation is of course possible.
The user is relieved from the burden of selecting an inverter, which is cumbersome and requires specialized knowledge, and the burden on equipment and operation is reduced. In addition, the wear of the bearings caused by the detection coils 66a and 66b wound on the stator core 4 of the canned motor 3 is reduced. When the canned motor operation monitoring device 65 for detecting the state is provided, its function is hardly impaired. In addition, the rotation direction of the canned motor pump 1 is always constant regardless of the connection order of the commercial power cable 34 to the terminal plate 29. The direction detection device is not required, and the wiring work becomes extremely easy.

And, in addition to the same effect as the first invention, the stator chamber
10 and the inverter chamber 44 are isolated from each other by the lead-in body 89 formed by the terminal plate 88, so that the volatile components of the insulating varnish impregnated in the stator 6 enter the inverter chamber 44, and
Corrosion and insulation deterioration occur in the weak current circuit 46 and its connector section where the weak current flows, such as the connector 47, causing the inverter to fail, or the high temperature of the stator chamber 10 flowing into the inverter chamber 44 to cause the inverter body 47 to rotate. In particular, it is prevented that the weak electric circuit 46 abnormally rises and leads to an inverter failure.

Note that, in the second invention, in addition to the embodiment shown in FIG. 4 of the first invention, in each of the other embodiments, the stator chamber 10 and the inverter chamber 44 are mutually connected by the lead-in wire 89. It can be easily applied by connecting and disconnecting the stator 6 and the output side 51 of the inverter body 47 via the lead-in body 89. For example, in the embodiment shown in FIG. As shown in FIG. 8, an insulating compound 90 is filled in the conductor through hole 79 of the rear end flange portion 7b of the stator frame 7 to form a conductor withdrawal body 89 of a pressure-resistant fixing type, or FIG. In the embodiment shown in FIG. 9, the stator frame 7 is provided with an intermediate flange portion 7c for supporting the rear end portion of the stator can 8 through the sealing means of the O-ring 91, and the intermediate flange portion 7c is provided.
Lead wire 50 to packing 92 and packing land 93 attached to
Through, and screw in packing land 93 to seal.
Pressure-resistant packing drop-in type lead-in body for compressing 92
4, or in the embodiment shown in FIG. 4, as shown in FIG. 10, an insulating mold 94 is provided on the connection pipe 49 as a lead-in body 89 through which the lead wire 50 passes airtightly. What is necessary is just to fill the stator room 10 behind the insulating chamber 95 with the insulating mold 95 so as to shut off the stator room 10 and the inverter room 44.

As described above, the embodiment in which the first invention and the second invention are applied to the radial gap type canned motor pump has been described, but regardless of the radial gap type or the axial gap type,
It can be applied to all explosion-proof canned motors driven by inverters, such as canned motor stirrers, canned motor compressors, and canned motor blowers.

(Effect of the Invention) According to the explosion-proof canned motor with the inverter according to the first aspect of the invention, the explosion-proof structure in which the inverter is integrated with the canned motor makes it possible to select and incorporate the most suitable inverter for the canned motor. Since it is possible to perform on-site operations in danger areas where canned motors are installed, it is possible to reduce the burden of selecting and wiring the inverter, which is cumbersome and requires specialized knowledge, from the user, and it is possible to reduce equipment and operation costs and reduce wiring costs. Mistakes can be prevented.

According to the explosion-proof canned motor with the inverter according to the second aspect, in addition to the effect of the explosion-proof canned motor with the inverter according to the first aspect, the stator chamber and the inverter chamber are shut off from each other by the lead-in body. Therefore, for example, it is possible to prevent the inverter from abnormally rising in temperature or causing corrosion or insulation deterioration to cause a failure due to the intrusion of high-temperature air in the stator chamber or volatile components of the insulating varnish impregnated in the stator into the inverter chamber. .

According to the explosion-proof canned motor with the inverter according to the third aspect, in addition to the effect of the explosion-proof canned motor with the inverter according to the first or second aspect, at least some of the parts constituting the inverter are formed on the inner wall of the inverter pressure-resistant container. A metal heat sink is attached and attached, and a cooling jacket chamber through which a cooling liquid flows is formed on the outer wall side, so that an inverter having an explosion-proof structure can be cooled.

According to the explosion-proof canned motor with the inverter according to the fourth aspect, in addition to the effect of the explosion-proof canned motor with the inverter according to the first or second aspect, cooling is performed on the outer wall side of the inverter pressure-resistant container that is forcibly cooled by the cooling motor fan. Since the fins are protruded and the metal heat radiating plate of at least a part of the inverter is abutted on the inner wall, the inverter having the explosion-proof structure can be cooled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment in which the first invention is applied to a radial gap type canned motor pump, FIG. 2 is a transverse sectional view taken along line AA of FIG. 1, and FIG. FIGS. 4 to 6 are longitudinal sectional views showing other embodiments of the same, respectively.
FIG. 7 is a longitudinal sectional view showing an embodiment in which the second invention is applied to a radial gap type canned motor pump, and FIGS.
FIG. 10 is a partial sectional view showing another embodiment of the above. 3 ... canned motor, 6 ... stator, 9 ... canned motor pressure-resistant container, 10 ... stator chamber, 39a ... inner wall, 39b ...
... outer wall, 43 ... inverter pressure vessel, 44 ... inverter room, 48 ... inverter, 49 ... connection pipe as communication part,
58 ... parts, 58a ... metal radiator plate, 59 ... cooling jacket room, 79 ... conductor through-hole as communication part, 80 ... cooling jacket room, 81 ... cooling motor fan, 82 ... fan motor , 83 ... Rotary shaft, 84 ... Flame escape prevention gap, 85 ...
… Fan, 86 …… cooling fin, 89 …… lead-in wire.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Hisashi Misato 389, Inohara, Shingu-cho, Ibo-gun, Hyogo Prefecture (72) Inventor Kiyotaka Tabuchi 946-2, Kurosaki, Mitsu-cho, Ibo-gun, Hyogo Prefecture (56) References JP 58 JP-A-49061 (JP, A) JP-A-59-194646 (JP, A) JP-A-60-5182 (JP, U) JP-A-61-72055 (JP, U) JP-A-63-100947 (JP, U) (58) Fields surveyed (Int.Cl. ⁶ , DB name) H02K 5/132 H02K 5/22

Claims (4)

(57) [Claims] A canned motor pressure vessel having a stator chamber; a canned motor having a stator disposed in a stator chamber of the canned motor pressure vessel; An inverter pressure vessel having an inverter chamber communicated with the stator chamber; a communication section communicating the stator chamber of the canned motor pressure vessel with the inverter chamber of the inverter pressure vessel; and an inverter chamber of the inverter pressure vessel. And an inverter connected to a stator through the communication section to control the canned motor. An explosion-proof CAD motor with an inverter. 2. The explosion-proof can with inverter according to claim 1, further comprising a lead-in body for shutting off the stator chamber and the inverter chamber in the communication part and connecting the stator and the inverter. motor. 3. The inverter has a metal radiator plate for at least a part of the inverter. The metal radiator plate is abutted on the inner wall of the inverter pressure-resistant container, and is provided on the outer wall side. The explosion-proof canned motor with an inverter according to claim 1 or 2, wherein a cooling jacket chamber through which a cooling liquid flows is formed. 4. The inverter has a metal heat radiating plate for at least a part of the inverter, and the inverter pressure-resistant container is disposed between the fan motor and the inverter pressure-resistant container disposed in the inverter room. A cooling motor fan having a rotation shaft of a fan motor protruding out of the inverter pressure-resistant container with an escape clearance formed therein, a cooling motor fan having a fan attached to a protruding end of the rotation shaft, and forced by the cooling motor fan The explosion-proof can with an inverter according to claim 1 or 2, wherein cooling fins are protruded from an outer wall side of the inverter pressure-resistant container to be cooled, and the metal heat sink is abutted and attached to an inner wall. motor.