JPS585496A - Improvement of canned motor pump - Google Patents

Abstract

PURPOSE:To permit automatic gas and/or liquid ventilation by drilling communication holes on the upper and lower sides of the both walls partitioning a pump chamber and a rotor chamber and installing, in said communication holes, a check valve which obstructs the counter-flow of the treated liquid supplied from the pump chamber. CONSTITUTION:When the treated liquid in a pump chamber 18 and in the motor part 12, is discharged, the piping system of the pump is cut-off, and the vent 72 formed in the pump part 10 is opened, then all the treated liquid in the pump chamber 18 can be discharged outside. During this period, if the liquid level in the pump chamber 18 lowers below the at in the motor part 12, and the liquid pressure in the motor part 12 rises above that in the pump chamer 18, the check valve part 12 rises above that in the pump chamber 18, the check valve 70 fitted in the communication holes 68 on the lower sides of both walls 50 is opened. Then, the treated liquid in the motor part 12 is automatically discharged into the pump chamber 18 through the communication hole 68 under the action of the check valve 70.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a life pump equipped with an automatic gas pricing mechanism and an automatic housing removal mechanism.

Conventionally, Yanto motor pumps have a pump chamber with an impeller attached to the motor shaft inside the pump casing, and a pump electric machine. The liquid is introduced into the canned motor aSS motor through a conduit (from the pump discharge side), and this liquid is circulated to the motor rotor chamber and then into the pump chamber to cool the motor and bearing O@ slip. There are no known configurations to do this.

This type of medium yant motor pump generally has a motor rotor.
It is configured as a horizontal canned motor pump with the shaft located in the horizontal direction, and air bubbles etc. get mixed into the liquid handled.
Air bubbles are generated, and when these air bubbles are introduced into the tin inside the canned motor, the bearing suddenly becomes dry.
4. If the construction is not progressing rapidly, but if it is a flammable gas, there is a risk of explosion. From this point of view, in conventional canned motor pumps, a gas vent valve is provided at the upper position of the end plate to block the rear motor rotor imt of the middle motor. A configuration has been implemented in which the canned motor is opened to discharge a large amount of gas that remains in the canned motor 11.

However, with the conventional canned motor pump described above, the gas vent valve O must be opened manually, and when handling a black case that generates a relatively large amount of gas, it is difficult to perform the gas venting operation.
! You need to work hard.

Moreover, in order to automatically carry out a gas venting operation like the one described above, a special control device or the like must be added, and maintenance work is also troublesome.

1! Furthermore, in the conventional canned motor pump mentioned above, the pump chamber and the middle motor are separated by a line. This must be done through a separate vent from the Yant motor.

Therefore, vents for discharging the handled liquid are generally provided at the bottom of the pump casing and on the lower part of the end plate that closes off the rear motor rotor 11 of the middle motor.

This round, conventional canned motor pump has the disadvantages that, in addition to the above-mentioned repeated degassing, maintenance and inspection work is cumbersome and cumbersome.

Therefore, the present inventor has overcome the above-mentioned problems of the conventional medium-sized Yant motor pump, has a simple configuration, automatically vents the gas inside the canned motor, and also discharges the electrical fluid inside the canned motor. As a result of various studies to ensure that this could be done automatically, we decided to install communication between the front 7-low chamber and the high-pressure part of the pump chamber, respectively, on the upper and lower sides of the kmo that separate the middle motor and the pump room. A hole is drilled, and a check valve is installed at the open end of the hole on the pump body side, which is closed by the high pressure of the pump. There are nine holes on the wall.
At the same time, the handled liquid in the canned motor can be automatically discharged into the pump chamber through nine holes provided on the lower side of the partition wall. Ta.

Therefore, the purpose of this @O is to automatically discharge the gas trapped in the canned motor, and also to automatically discharge the liquid handled in the canned motor to the pump chamber side during maintenance. We would like to provide a canned motor pump that is easy to handle.

In order to achieve the above object, the present invention includes a pump section and a canned motor, and a pump chamber is configured by disposing an impeller attached to a motor shaft in the pump section. A canned motor configured to introduce a part of the handled liquid from the pump discharge side through the circulation pipe into the rear low I chamber of the canned solitaire, and to flow it to the front low chamber and into the pump chamber. In the pump, a through hole is formed on the upper side of the crystal surface 110 and/or the lower side of the crystal surface 110 that partitions the pump chamber and the front row I11, and a check valve is installed in the ζ0 through hole to prevent the reverse flow of the handled liquid from the pump chamber. 1. In the canned motor pump described above, the through hole bored on the upper side of the partition wall connects the upper end of the front low chamber and the high pressure section on which the pump output pressure acts. Constructed for communication, 119,
It is preferable that the through hole formed on the lower side of 1iai is constructed so as to communicate between the lower end of the front rotor shaft and the high pressure section on which the pump output pressure acts.

The check valve is composed of a ball valve, and is constructed so that it closes due to its own weight and closes at a predetermined discharge pressure of the pump.

Furthermore, pump I! A vent is provided at a position corresponding to the lower end of the pump chamber for discharging the handled liquid in the canned motor section and the handled liquid in the pump chamber to the outside.

Next, an embodiment of a canned motor pump according to the present invention will be described in detail below with reference to the accompanying drawings.

No. 111 shows an embodiment of a canned motor pump according to the present invention, reference numeral 10 indicates a pump section, 12 indicates a canned motor section, and pump 1110 and motor 512
Toba i-dub-14 is compatible with each p.
has been done.

Pump l11 OK has impeller 16 and nine pumps 1i
The impeller 16 includes an intermittent pipe 1620 and a discharge pipe 11s22 that communicate with each other.
40 is attached to the extended end. On the other hand, motor [11
2 consists of a stay I assembly 26 and a rotor assembly 28, the row shaft 24 is supported by a front bearing 30 and a rear bearing 32, respectively, and the front row 1@54 and the rotor assembly 28 are respectively supported at both ends S of the rotor assembly 28. A rear rotor chamber 36 is formed. The front rotor chamber 54 and the rear rotor chamber 56 are each defined by a bearing support member 58.40, and each bearing support member 58.40 has a liquid passage hole 4.
'l, 44 are bored and configured to smoothly lubricate the front bearing 30 and the rear bearing 32 by the outlet pipe HIA 22 of the pump section 10,
The circulation pipe 48 is led out through the filter 46, and the hyomm pipe 4B is connected to the rear low end 36 of the motor 12 (111!).
L. It is configured to guide a part of the handled liquid to the low chamber.

- 10,000, the pump 1i18 and the front rotor 1134 are the wall 5
Divided by 0.

The rotor shaft 24 has a shaft through hole 5 drilled in the center of the maso.
2 into the pump chamber 18.

The OS configuration described above is basically the same as that of a conventional canned motor pump. That is, a portion of the handled liquid discharged from the pump In10 is introduced into the rear low chamber 36 via the monolithic tube 4B. A portion of the handling liquid introduced into the rear rotor chamber 36 lubricates the rear bearing 32 while passing through the stator 26, row 1128, and oniw to cool the motor section 12, and is then guided to the front rotor chamber 34. Ru. In this way, the handling liquid can be introduced into the front low chamber 34, and a part of it lubricates the front bearing 50, and the pump ii [Flows out to the low pressure @ of 18. Note that a balance hole 54 is bored in the back shroud of the impeller 16 at a position facing the gap between the shaft through holes 52.

Therefore, in the present invention, the high pressure of the pump chamber 18 is connected to the upper side of the partition wall 50 that partitions the front low chamber S4 of the seventh part 12 and the pump chamber 18 from the upper end of the front rotor @S40. Therefore, a gas venting hole 56 communicating with the discharge side, that is, the outer peripheral side of the impeller 16 is bored. In this case, the through hole 560
A check valve 58 is provided to prevent the handled liquid from flowing directly into the through hole 56 (from the pump chamber 18 side opening mKa and the pump chamber 18). Examples of preferred variants of the check valve 58 that are particularly useful include:
A ball valve 60 is preferred, as shown in detail in FIG. That is, the pump opening of the through hole 56 is bored to have a slightly larger diameter, the stepped portion is configured as a valve seat 62, and the ball valve 60 is accommodated in the larger diameter portion 64. Bottom surface 6 of large diameter portion 64
4m, when the pump is stopped, the ball valve 60 (due to its own weight) is tilted downward to the pump i [181g] so that it is separated from the valve seat 62, and then the ball valve Fill 166 to prevent 60 from falling off.
Yt@arrive.

However, the gas that invaded or was generated within Maw/l112 was Ro I Emperor! 4. It stays at the top inside js4. Therefore, the low Ifil&4.56 Kfm gas is introduced into the through hole 56 provided on the upper side of the partition wall 50. The gas thus introduced into the one through hole s6 is automatically discharged or leaked into the pump 1118 via the check valve 58 when the pump is stopped.

In addition, at Motoya@, 7-part 12 (D front low-
On the lower side of the plan 50 that partitions the front rotor chamber 34 and the pump chamber 8, there is a casing removal hole that communicates from the lower end of the front rotor chamber 34 to the discharge side of the pump chamber 34, that is, the outer periphery of the impeller 140. 68 is drilled. In this case as well, 1 hole 680 pump 1
A check valve 70 is provided in the opening 11 to prevent the handling 111tIX from flowing directly from the pump chamber 18 into the through hole 68. Also, the check valve 70 used for ζ ζ2 is composed exactly the same as 56 (see Diagram 2). In addition, at the lower end i1 of the pump chamber 18,
When discharging the handled liquid to the outside during maintenance, etc., a ninth vent 72 should be provided (configure it as shown in Figure 1), and when discharging the KII liquid for maintenance, etc., the pump piping system must be cut. Then, if the vent 72 provided in the pump section 10 is opened, the pump 1118
The liquid level in the pump chamber 1B is also lowered (the liquid level in the motor section 12) is discharged to the outside.

Moreover, when the pressure in the motor housing 12 becomes higher than the hydraulic pressure in the pump chamber 18, the large check valve 70 installed in the lower O through hole 46 of the partition wall 500 opens. As a result, the handled liquid in the motor 12 is automatically discharged into the pump chamber 18 through the through hole 68 under the action of the check valve 700. Therefore, when the liquid in the pump chamber 18 is completely discharged through the vent 72, the liquid in the motor 12 is also automatically completely discharged.

As is clear from the nine embodiments described above, according to the present invention,
By providing through holes with check valves of the same configuration on the upper and lower sides of the partition wall that partitions the pump chamber and the front low I chamber, the gas vent 11 in the motor section can be automatically vented. When discharging the handled liquid in the pump car, it is possible to automatically connect the O liquid inside the pump.

Therefore, the canned motor pump described in this M@ has a simple structure and can easily connect the gas and drain the liquid inside the motor without providing a gas vent valve or vent in the motor tin casing as in the conventional case. We meet based on what we want to achieve. That is,
The canned motor pump of the present invention improves the performance of the canned motor pump by only slightly changing the wall that partitions the pump chamber and the front rotor chamber compared to existing canned motor pumps. Although the preferred embodiments of the present invention have been described, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

1Ell is a WIIWft side view showing an embodiment of a canned motor pump according to the present invention, and Iris 2WA is a stripe 1 view κ.
Part 1 of the medium-sized motor pump shown! It is an enlarged cross-sectional view Ii. 10...Pump part 12...Canned motor 1m--Application 16--Impeller 18-...Pump chamber 2G-Moisture pipe bias 22-11 to outlet pipe 1124-OP shaft 26 −・・Stay assembly 28・Rotor assembly 30・
One front bearing 52-...Rear pairing Sa-
...Front low III 56... Rear low III 5
8, 40...Bearing support IIA material 42, 44...
・Liquid passage hole 46・-fill 48...circulation tube 50...wall 52・m-through hole 54...balance hole 56
・One hole 58...Check valve 40-ball valve

Claims (1)

[Claims] (1) Part of the pump bias kdp Yantmo],
Attach the impeller to the motor low-shaft on the pump S-Ii
! A pump structure is configured, and the pump handling liquid is transferred from the pump discharge side to the canned motor IiO*l via the sand circulation pipe.
1 o - Introduced into the room and configured to flow into one room and into the pump room, and draw the circle mark Yantmo pump #C to separate the pump part and the part rotor part 1i
The current Yantmo pump is designed to have a through hole in the upper side and/or lower side of the front, and to install a check valve in the through hole to prevent backflow from the pump chamber into the handling case. ■ The through hole drilled in the upper part of the painting wall is configured to communicate between the upper end of the front row and the high pressure on which the pump discharge pressure acts. Item 1 - Cando So-I Pump. ■ ■ The through hole drilled on the lower side of the wall O is constructed in such a way as to allow communication between the lower end of the scratch meter 110 and the high pressure section 1 on which the pump O discharge pressure acts. ■Iris item 1 O life Yant motor pump. - The check valve is a ball valve), and is constructed so that it closes by its own weight and closes by the discharge pressure of the pump 110. Described in any of O
Canned Order--Pump. ■ A large O pent is installed in the corner corresponding to the lower end of the pump IIO pump to discharge the O handled liquid in the canned motor and the O **** in the pump chamber to the outside. KlefaG canned moe pump from Section 4 of Section II.