CN214304424U - Low-temperature tank inner pump without balance mechanism - Google Patents
Low-temperature tank inner pump without balance mechanism Download PDFInfo
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- CN214304424U CN214304424U CN202120175459.0U CN202120175459U CN214304424U CN 214304424 U CN214304424 U CN 214304424U CN 202120175459 U CN202120175459 U CN 202120175459U CN 214304424 U CN214304424 U CN 214304424U
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- rotating shaft
- impeller
- spiral flow
- guide body
- balance mechanism
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Abstract
The utility model relates to a no balance mechanism cryogenic tank inner pump, include: the spiral flow guide body is of a columnar structure, a cavity is arranged in the spiral flow guide body and is configured to accommodate a primary impeller and a secondary impeller, blades of the primary impeller and blades of the secondary impeller are arranged back to back, a first through hole and a plurality of overflow channels are further arranged on the spiral flow guide body, and the cavity is in fluid conduction connection with the overflow channels; the rotating shaft penetrates through the first through hole, the primary impeller and the secondary impeller are sleeved on the rotating shaft in a sleeving manner, the first end of the rotating shaft is fixedly connected with the motor, and the second end of the rotating shaft is a free end; and the inducer is sleeved at the second end of the rotating shaft in a surrounding manner and is configured to induce the fluid to enter the spiral flow guide body. The utility model discloses the device does not have balance mechanism, has the vice advantage such as few, the bearing location of friction, more is fit for carrying low temperature easily gasify medium, the jamming risk of reduction pump rotor that can be very big.
Description
Technical Field
The utility model relates to a no balance mechanism cryogenic tank inner pump belongs to cryopump technical field.
Background
The pumps in the cryogenic tanks used at present all have balance mechanisms, and the balance mechanisms adopt a balance drum or a balance disc or a combination mode of the balance drum and the balance disc. The principle of the balance mechanism is to balance the axial force of the impeller by utilizing the pressure difference and the acting area of water power at different positions.
The axial force balance is established on the basis of the lift of the centrifugal pump, but the lift of the centrifugal pump changes along with the change of the flow, when the working point changes, the balance position needs to be established again, the gap of the balance mechanism changes, and namely the pump rotor moves. When the working condition changes rapidly or the machine is started or stopped, the balance mechanism inevitably generates grinding between the moving part and the static part due to inertia.
In order to establish a balance system, a balance mechanism is often required to be designed with a longer dynamic and static friction pair, and pressure difference between two sides of the balance mechanism is formed by utilizing the on-way loss of fluid passing through the gap of the dynamic and static friction pair. The increase of dynamic and static friction pairs in the rotor system can bring the risk of jamming and locking of the rotor.
In addition, the conveying medium of the pump in the low-temperature tank is a low-temperature medium easy to gasify, and when part of the medium gasifies when the pump operates under abnormal working conditions, pressure drop changes to unbalance the balance mechanism, dynamic and static contact of balance parts is caused, and shutdown faults and pump damage are promoted. Therefore, in view of the above, it is desirable to provide a new type of in-tank low pressure pump without a balancing mechanism to solve the deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
To the outstanding problem, the utility model provides a no balance mechanism cryogenic tank inner pump, the device do not have balance mechanism, have the vice advantage such as few, the bearing location of friction, more are fit for carrying the easy gasification medium of low temperature, the jamming risk of reduction pump rotor that can be very big.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a balance mechanism-less cryogenic in-tank pump comprising:
the spiral flow guide body is of a columnar structure, a cavity is arranged in the spiral flow guide body, the cavity is configured to accommodate a primary impeller and a secondary impeller, blades of the primary impeller and blades of the secondary impeller are arranged back to back, a first through hole and a plurality of overflow channels are further arranged on the spiral flow guide body, and the cavity is in fluid conduction connection with the overflow channels;
the rotating shaft penetrates through the first through hole, the primary impeller and the secondary impeller are sleeved on the rotating shaft in a sleeved mode, a first end of the rotating shaft is fixedly connected with a motor, a second end of the rotating shaft is a free end, and the rotating shaft is configured to drive the primary impeller and the secondary impeller to rotate under the driving of the motor, so that fluid is finally driven to flow in the spiral flow guide body;
an inducer looped over the second end of the rotating shaft, the inducer configured to induce fluid into the helical inducer.
The balance-mechanism-free cryogenic tank internal pump preferably further comprises a primary impeller opening ring and a secondary impeller opening ring, wherein the primary impeller opening ring is sleeved on the circumferential peripheral wall of a hub of the primary impeller, the secondary impeller opening ring is sleeved on the circumferential peripheral wall of the hub of the secondary impeller, and the outer diameter of the secondary impeller opening ring is larger than that of the primary impeller opening ring so as to balance the self weight of the rotating shaft and the axial force generated by the inducer.
The balance-mechanism-free cryogenic tank internal pump preferably further comprises a partition plate, the partition plate is positioned in the spiral flow guide body through a split baffle, a second through hole and a plurality of third through holes are formed in the partition plate, the second through hole is configured to accommodate the rotating shaft to penetrate through, and the third through holes are configured to be communicated with the overflow channels.
The balance-mechanism-free cryogenic tank internal pump preferably further comprises an upper bearing, a middle bearing and a lower bearing, wherein the upper bearing supports the rotating shaft in a three-point supporting mode, the upper bearing is fixed on a motor end cover through a bearing gland and serves as a fixed end of the rotating shaft, the middle bearing and the lower bearing are axially unlimited and serve as a floating end of the rotating shaft.
The balance mechanism-free cryogenic tank internal pump preferably further comprises a cooling pipe assembly, wherein the cooling pipe assembly is arranged in gaps between the motor end cover and the plurality of overflow channels so as to cool the motor and the bearing.
The balance mechanism-less cryopump preferably further includes a base valve configured to support the balance mechanism-less cryopump and to serve as a suction valve for the balance mechanism-less cryopump.
The balance-mechanism-free cryogenic tank internal pump is preferably provided with three overflow channels which are spirally arranged in the spiral flow guide body.
The utility model discloses owing to take above technical scheme, it has following advantage:
1. the utility model discloses the device is for having balance mechanism cryogenic tank internal pump, leans on the two-stage impeller to arrange self-balancing impeller axial force back to back, utilizes the impeller choma to act as the friction pair, and primary impeller adopts different sizes with secondary impeller choma simultaneously, produces the axial force opposite with the direction of gravity for balanced axis of rotation dead weight and the produced axial force of inducer, because there is no balance mechanism, when pump operating mode changes, the axial force is balanced constantly, and axis of rotation, impeller can not take place the drunkenness.
2. The utility model discloses there is not balance mechanism low temperature jar inner pump, have the vice advantage such as few, the bearing location of friction, more be fit for carrying low temperature easily gasification medium, reduction pump rotor jamming risk that can be very big.
Drawings
Fig. 1 is a schematic view of an overall structure of a balance mechanism-less cryogenic tank internal pump according to an embodiment of the present invention;
fig. 2 is an isometric view of the spiral baffle provided by this embodiment of the present invention;
fig. 3 is an isometric view of the spiral deflector hydraulic core provided by this embodiment of the present invention;
the reference numerals in the figures are as follows:
1-a suction section; 2-first stage impeller; 3-split baffle; 4-a separator; 5-a secondary impeller; 6-rotating shaft; 7-a spiral flow conductor; 8-motor housing; 9-a motor assembly; 10-motor end cover; 11-a cooling tube assembly; 12-an upper bearing; 13-bearing gland; 14-an intermediate bearing; 15-secondary impeller eye; 16-first stage impeller eye ring; 17-an inducer; 18-a lower bearing; 19-a bottom valve; 20-first via.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary person in the art without creative work belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The utility model discloses the device is for having balance mechanism cryogenic tank inner pump, leans on the two-stage impeller to arrange self-balancing impeller axial force back to back, utilizes the impeller choma to act as the friction pair, and the first impeller adopts different sizes with secondary impeller choma simultaneously, produces the axial force opposite with the direction of gravity for balanced axis of rotation dead weight and the produced axial force of inducer, because there is no balance mechanism, simple structure is compact, has avoided the small clearance wearing and tearing trouble that balance mechanism brought. When the working condition of the pump changes, the pump can ensure the balance at all times, namely the shifting of the rotating shaft, the impeller and the bearing caused by the unbalance of the axial force can not occur.
As shown in fig. 1 and 2, the present embodiment provides a balance mechanism-less cryogenic tank internal pump including:
the spiral flow guide body 7 is of a columnar structure, a cavity is arranged in the spiral flow guide body 7 and is configured to accommodate the primary impeller 2 and the secondary impeller 5, blades of the primary impeller 2 and blades of the secondary impeller 5 are arranged back to back, a first through hole 20 and a plurality of overflow channels are further arranged on the spiral flow guide body 7, and the cavity is in fluid conduction connection with the overflow channels;
the rotating shaft 6 penetrates through the first through hole 20, the primary impeller 2 and the secondary impeller 5 are sleeved on the rotating shaft 6 in a sleeving manner, the first end of the rotating shaft 6 is fixedly connected with the motor, the second end of the rotating shaft 6 is a free end, and the rotating shaft 6 is configured to drive the primary impeller 2 and the secondary impeller 5 to rotate under the driving of the motor, so that fluid is finally driven to flow in the spiral flow guide body 7;
an inducer 17, the inducer 17 being looped around the second end of the rotating shaft 6, the inducer 17 being configured to induce the fluid into the helical flow conductor 7.
In this embodiment, it is preferable that the centrifugal impeller further includes a primary impeller opening ring 16 and a secondary impeller opening ring 15, the primary impeller opening ring 16 is sleeved on the hub circumferential wall of the primary impeller 2, the secondary impeller opening ring 15 is sleeved on the hub circumferential wall of the secondary impeller 5, the outer diameter of the secondary impeller opening ring 15 is larger than the outer diameter of the primary impeller opening ring 16, and the secondary impeller opening ring 15 generates an upward axial force by calculation so as to balance the self weight of the rotating shaft 6 and the axial force generated by the inducer 17.
In this embodiment, preferably, the spiral baffle further includes a partition plate 4, the partition plate 4 is positioned in the spiral baffle 7 through the split baffle 3, and the partition plate 4 is provided with a second through hole and a plurality of third through holes, the second through hole is configured to accommodate the rotating shaft 6 to pass through, and the plurality of third through holes are configured to communicate with the plurality of overflow channels.
In this embodiment, it is preferable that the electric motor further includes an upper bearing 12, a middle bearing 14, and a lower bearing 18, the upper bearing 12, the middle bearing 14, and the lower bearing 18 support the rotating shaft 6 in a three-point supporting manner, the upper bearing 12 is fixed to the motor end cover 10 through a bearing cover 13 to serve as a fixed end of the rotating shaft 6, and the middle bearing 14 and the lower bearing 18 are axially unlimited to serve as a floating end of the rotating shaft 6.
In the present embodiment, it is preferable that a cooling pipe assembly 11 is further included, and the cooling pipe assembly 11 is disposed at the motor end cover 10 and in a gap between the overflow passages to cool the motor and the bearing.
In this embodiment, the cooling tube assembly 11 preferably uses the first-stage lift to cool the motor and the bearing, so that the heat-exchanged medium is guided back to the pump inlet.
In this embodiment, it is preferable that the bottom valve 19 is further included, the bottom valve 19 is configured to support the unbalanced mechanism cryogenic tank internal pump, and the bottom valve 19 is most important to function as a suction bottom valve of the unbalanced mechanism cryogenic tank internal pump, and is controlled to be opened and closed by the self weight of the unbalanced mechanism cryogenic tank internal pump. A bottom valve is generally provided between the bottom plate of the storage tank and the pump well, the base of the pump is located on the bottom valve, and when the pump is installed, the valve is opened by the gravity action of the pump, and the pump is in liquid communication with the storage tank. When the pump is taken out for maintenance, the valve loses the gravity action of the pump, and the valve is closed under the combined action of the acting force of the spring and the static pressure in the storage tank.
In this embodiment, preferably, as shown in fig. 3, the number of the overflow channels is three, and the overflow channels are spirally arranged in the spiral flow guiding body 7, so that the first-stage impeller 2 and the second-stage impeller 5 are arranged in series back-to-back to realize self-balancing impeller hydraulic axial force.
In this embodiment, the spiral flow conductor 7 is preferably a one-piece cast structure.
In this embodiment, preferably, the submersible motor is used to provide driving force for the rotating shaft, and the bearings are cooled by a low-temperature bearing medium.
In this embodiment, preferably, the overflow channel adopts a three-volute flow channel, so as to fully utilize the radial space in the pump well and ensure the flow area of the flow channel. And meanwhile, a cooling pipe is designed at the gap part between the three flow channels, so that the medium after heat exchange returns to the inlet of the pump.
The utility model discloses the device is for not having balance mechanism, and simple structure is compact, has avoided the small clearance wearing and tearing trouble that balance mechanism brought. The utility model discloses water conservancy self-balancing axial force, no matter how the pump operating mode point changes, the pump can guarantee constantly balanced, when the pump operating mode takes place undulantly promptly, drunkenness because of the axial force imbalance causes can not appear in axis of rotation, impeller, bearing (for short the rotor). The utility model discloses the device is fit for the use operating mode of low temperature storage tank in-tank pump.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A balance mechanism-free cryogenic tank internal pump, comprising:
the spiral flow guide body (7) is of a columnar structure, a cavity is arranged in the spiral flow guide body (7), the cavity is configured to accommodate a primary impeller (2) and a secondary impeller (5), blades of the primary impeller (2) and blades of the secondary impeller (5) are arranged back to back, a first through hole (20) and a plurality of overflow channels are further arranged on the spiral flow guide body (7), and the cavity is in fluid conduction connection with the overflow channels;
the rotating shaft (6) penetrates through the first through hole (20), the primary impeller (2) and the secondary impeller (5) are sleeved on the rotating shaft (6) in a sleeved mode, a first end of the rotating shaft (6) is fixedly connected with a motor, a second end of the rotating shaft (6) is a free end, the rotating shaft (6) is configured to drive the primary impeller (2) and the secondary impeller (5) to rotate under the driving of the motor, and finally, fluid is driven to flow in the spiral flow guide body (7);
an inducer (17), the inducer (17) being looped around the second end of the rotational axis (6), the inducer (17) being configured to induce fluid into the helical flow conductor (7).
2. The balance mechanism-less cryopump inside tank of claim 1, further comprising a primary impeller eye ring (16) and a secondary impeller eye ring (15), wherein the primary impeller eye ring (16) is looped around a hub circumferential peripheral wall of the primary impeller (2), the secondary impeller eye ring (15) is looped around a hub circumferential peripheral wall of the secondary impeller (5), and an outer diameter of the secondary impeller eye ring (15) is larger than an outer diameter of the primary impeller eye ring (16) to balance a self weight of the rotating shaft (6) and an axial force generated by the inducer (17).
3. The balance mechanism-free cryogenic in-tank pump according to claim 1, further comprising a partition plate (4), wherein the partition plate (4) is positioned in the spiral flow guide body (7) through a split baffle (3), and a second through hole and a plurality of third through holes are arranged on the partition plate (4), the second through hole is configured to receive the rotating shaft (6) to pass through, and the plurality of third through holes are configured to communicate with the plurality of overflow channels.
4. The balance mechanism-free cryogenic tank internal pump according to claim 1, further comprising an upper bearing (12), a middle bearing (14) and a lower bearing (18), wherein the upper bearing (12), the middle bearing (14) and the lower bearing (18) support the rotating shaft (6) in a three-point support manner, the upper bearing (12) is fixed on a motor end cover (10) through a bearing gland (13) to serve as a fixed end of the rotating shaft (6), and the middle bearing (14) and the lower bearing (18) are axially unlimited to serve as a floating end of the rotating shaft (6).
5. The balance mechanism-less cryopump of claim 4, further comprising a cooling tube assembly (11), said cooling tube assembly (11) being arranged in a gap between said motor end cover (10) and said plurality of overflow channels to cool the motor and bearings.
6. The unbalanced mechanism cryogenic tank internal pump of claim 1, further comprising a base valve (19), the base valve (19) configured to support the unbalanced mechanism cryogenic tank internal pump and to act as a suction valve for the unbalanced mechanism cryogenic tank internal pump.
7. The balance mechanism-less cryopump in a tank of claim 1, wherein the number of said overflow channels is three and is arranged spirally in said spiral flow conductor (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120175459.0U CN214304424U (en) | 2021-01-22 | 2021-01-22 | Low-temperature tank inner pump without balance mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120175459.0U CN214304424U (en) | 2021-01-22 | 2021-01-22 | Low-temperature tank inner pump without balance mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN214304424U true CN214304424U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120175459.0U Active CN214304424U (en) | 2021-01-22 | 2021-01-22 | Low-temperature tank inner pump without balance mechanism |
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| CN (1) | CN214304424U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4325059A1 (en) * | 2022-08-18 | 2024-02-21 | Pratt & Whitney Canada Corp. | Compressor having a dual-impeller |
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2021
- 2021-01-22 CN CN202120175459.0U patent/CN214304424U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4325059A1 (en) * | 2022-08-18 | 2024-02-21 | Pratt & Whitney Canada Corp. | Compressor having a dual-impeller |
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