CN213088259U - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
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- CN213088259U CN213088259U CN202021277336.XU CN202021277336U CN213088259U CN 213088259 U CN213088259 U CN 213088259U CN 202021277336 U CN202021277336 U CN 202021277336U CN 213088259 U CN213088259 U CN 213088259U
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Abstract
The utility model provides a centrifugal pump, include: a pump body; an impeller; the motor comprises a motor shell, the motor shell comprises a front end cover and a rear end cover, the pump body is fixedly connected with the front end cover, and the front end cover and the rear end cover are respectively and rotatably provided with a power shaft through a front bearing and a rear bearing; the power shaft drives the impeller to rotate and forms a high pressure area and a low pressure area in the pump body; a liquid flow channel is arranged in the power shaft, a liquid outlet cavity is arranged in the motor shell, one end of the liquid flow channel is communicated with the liquid outlet cavity, and the other end of the liquid flow channel is communicated with the low-pressure area; the high-pressure area is communicated with the inside of the motor shell through a fit clearance between the front bearing and the power shaft or an inner clearance of the front bearing, and the liquid outlet cavity is communicated with the inside of the motor shell through a fit clearance between the rear bearing and the power shaft or an inner clearance of the rear bearing. The liquid inlet and the liquid outlet are achieved by utilizing the fit clearance or the bearing inner clearance, the structure of the motor is in the motor, a liquid inlet hole and a liquid outlet hole do not need to be processed on the motor shell, the motor manufacturing process can be simplified, and the manufacturing cost is reduced.
Description
Technical Field
The utility model relates to a centrifugal pump.
Background
The centrifugal pump generally includes a pump body and a motor connected to the pump body, an impeller is disposed in the pump body, and a power shaft of the motor is in transmission connection with the impeller to drive the impeller to rotate, thereby achieving the function of the centrifugal pump. Since the motor generates heat during use, a cooling system is required to dissipate the heat of the motor.
For example, the circulating cooling structure of a centrifugal pump motor disclosed in chinese patent application with application publication No. CN104410202A includes a pump motor composed of a motor housing, a stator assembly, an impeller, a rotor, a rear end cap, a rotor shaft, a front bearing, and a rear bearing, wherein the motor housing and the rear end cap are connected into a whole by bolts to form a motor housing, the stator assembly is mounted on an inner cylindrical surface of the motor housing, and the rotor is fixed on the rotor shaft and coaxial with the stator assembly. The front bearing is arranged in a front bearing seat on the motor shell, and the rear bearing is arranged in a rear bearing seat on the rear end cover. The centrifugal pump shell is connected with the motor shell into a whole, and an impeller inside the centrifugal pump shell is arranged on the rotor shaft. When the centrifugal pump motor works, a cavity between the impeller and the motor shell is a high-pressure area, a cavity on the left side of the impeller is a low-pressure area, and a working medium outlet communicated with the high-pressure area and a working medium inlet communicated with the low-pressure area are arranged on the shell of the centrifugal pump. At least two liquid inlet holes are uniformly distributed on the circumference of the front end of the motor shell and are communicated with the high-pressure area and the front cavity of the motor shell. In addition, at least two radially extending liquid outlet holes are uniformly distributed on the circumference of the rear bearing seat and are communicated with the inner cavity of the rear end cover and the inner cavity of the rear bearing seat. The rotor shaft is a hollow shaft, and a central hole of the rotor shaft is communicated with the low-pressure area and the inner cavity of the rear bearing seat.
When the cooling device works, a working medium in a high-pressure area flows into a low-pressure area through a cooling channel formed by a liquid inlet hole, a shell front cavity, a gap between the stator assembly and the rotor, a rear end cover inner cavity, a liquid outlet hole, a rear bearing seat inner cavity and a rotor shaft central hole, so that heat in the pump motor is taken away, and the pump motor is cooled.
Foretell centrifugal pump shell is connected with motor casing, has formed the high-pressure area between impeller and motor casing, and inside for convenient liquid gets into motor casing, need set up the feed liquor hole on motor casing, for conveniently going out liquid simultaneously, need set up out the liquid hole on the rear end cover, to the manufacturing process of motor like this, just increased set up the step in feed liquor hole and play liquid hole on the casing, caused the manufacturing process of motor more complicated, increased manufacturing cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a centrifugal pump to need processing feed liquor hole and play liquid hole to dispel the heat to the motor with supplying liquid to flow through the motor inside on the motor casing of solving current centrifugal pump, and lead to the more complicated problem of motor manufacturing process.
In order to achieve the above object, the utility model provides a centrifugal pump adopts following technical scheme:
a centrifugal pump, comprising:
a pump body;
the impeller is arranged in the pump body;
the motor comprises a motor shell, the motor shell comprises a front end cover and a rear end cover, the pump body is fixedly connected with the front end cover, the front end cover and the rear end cover are respectively and rotatably provided with a power shaft through a front bearing and a rear bearing, a stator is arranged in the motor shell, a rotor is arranged on the power shaft, and a gap is formed between the stator and the rotor;
the power shaft penetrates through the front end cover to be in transmission connection with the impeller so as to drive the impeller to rotate and form a high-pressure area close to the motor shell and a low-pressure area far away from the motor shell in the pump body;
a liquid flow channel is arranged in the power shaft, a liquid outlet cavity is arranged at the rear end in the motor shell, the liquid outlet cavity is enclosed by a rear bearing, the power shaft and a rear end cover, one end of the liquid flow channel is communicated with the liquid outlet cavity, and the other end of the liquid flow channel is communicated with the low-pressure area;
the high-pressure area is communicated with the inside of the motor shell through a fit clearance between the front bearing and the power shaft or an inner clearance of the front bearing, so that liquid in the high-pressure area can enter the inside of the motor shell through the fit clearance between the front bearing and the power shaft or the inner clearance of the front bearing, and the liquid outlet cavity is communicated with the inside of the motor shell through a fit clearance between the rear bearing and the power shaft or the inner clearance of the rear bearing, so that the liquid in the motor shell can enter the liquid outlet cavity through the fit clearance between the rear bearing and the power shaft or the inner clearance of the rear bearing.
The beneficial effects of the above technical scheme are that: because the high-pressure area is communicated with the inside of the motor shell through the matching gap between the front bearing and the power shaft or the internal gap of the front bearing, liquid in the high-pressure area can enter the inside of the motor shell through the matching gap between the front bearing and the power shaft or the internal gap of the front bearing and then flow to the rear end in the motor shell through the gap between the stator and the rotor, and the liquid outlet cavity is communicated with the inside of the motor shell through the matching gap between the rear bearing and the power shaft or the internal gap of the rear bearing, so that the liquid in the motor shell can enter the liquid outlet cavity through the matching gap between the rear bearing and the power shaft or the internal gap of the rear bearing, and because the liquid flow channel is arranged in the power shaft, one end of the liquid flow channel is communicated with the liquid outlet cavity, and the other end is communicated with the low-pressure area, so that the liquid can flow to, the purpose that liquid in the pump body flows through the inside of the motor is achieved, so that heat in the motor can be taken away, and the motor is cooled.
The utility model discloses what utilize is that the feed liquor is realized to fit clearance between front bearing and the power shaft or through the internal clearance of front bearing, utilizes fit clearance between rear bearing and the power shaft or the internal clearance through the rear bearing to realize going out liquid simultaneously, and what utilize all is the structure of the inside itself of motor, compares prior art, need not to process feed liquor hole and go out the liquid hole on motor casing, consequently can simplify the manufacturing process of motor, reduces manufacturing cost.
Further, in order to facilitate the connection between the pump body and the front end cover, the pump body passes through connection structure and front end cover fixed connection, connection structure is the I shape, connection structure include with the first connecting plate that the pump body links to each other, with the second connecting plate that the front end cover links to each other and set up the necking down section between first connecting plate and second connecting plate, the power shaft run through the necking down section and with have the clearance between the necking down section to make the liquid in high pressure district at first inside the reentrant motor casing behind the necking down section.
Furthermore, in order to facilitate manufacturing and connection and simultaneously facilitate ensuring the sealing property, the connecting structure and the pump body are integrally arranged.
Furthermore, in order to facilitate liquid discharge, the end part of the power shaft penetrates out of the impeller, a liquid discharge hole communicated with the liquid flow channel is formed in the penetrating end of the power shaft, which penetrates out of the impeller, and the liquid discharge hole extends along the radial direction of the power shaft.
Furthermore, in order to facilitate the processing and manufacturing of the power shaft, the liquid flow channel penetrates through the power shaft along the axial direction of the power shaft.
Furthermore, in order to facilitate the connection between the power shaft and the impeller, the power shaft is in threaded connection with the impeller.
Drawings
Fig. 1 is a schematic structural view of a centrifugal pump according to the present invention;
fig. 2 is a structural view of the power shaft of fig. 1.
In the figure: 1-an inlet cylinder; 2-a screw; 3-a pump body; 4-an impeller; 5-a first connection plate; 6-a neck reduction section; 7-a second connecting plate; 8-front end cover; 9-a front bearing; 10-a rotor; 11-a stator; 12-a power shaft; 121-a threaded segment; 122-a flow channel; 123-liquid outlet hole; 13-motor housing; 14-a rear bearing; 15-a liquid outlet cavity; 16-rear end cap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
An embodiment of the centrifugal pump of the present invention is shown in fig. 1, and includes a pump body 3, and an impeller 4 is provided in the pump body 3. The centrifugal pump further comprises a motor, the motor comprises a motor housing 13, the motor housing 13 comprises a front end cover 8 and a rear end cover 16, the front end cover 8 and the rear end cover 16 in the embodiment are both arranged in a split mode, and in other embodiments, one of the front end cover 8 and the rear end cover 16 can be arranged to be integrated with the motor housing.
The front end cover 8 is provided with a front bearing 9, the rear end cover 16 is provided with an inward convex cylindrical structure, the cylindrical structure is provided with a rear bearing 14, and the power shaft 12 is rotatably arranged on the front end cover 8 and the rear end cover 16 through the front bearing 9 and the rear bearing 14. A stator 11 is arranged in a motor shell 13, a rotor 10 is arranged on a power shaft 12, and a gap is formed between the stator 11 and the rotor 10.
The pump body 3 passes through connection structure and 8 fixed connection of front end housing, and connection structure is the I shape and sets up with 3 an organic whole of the pump body, and connection structure includes the first connecting plate 5 that links to each other with 3 an organic whole of the pump body, the second connecting plate 7 that links to each other with 8 fixed of front end housing and the necking down section 6 of an organic whole setting between first connecting plate 5 and second connecting plate 7, power shaft 12 run through necking down section 6 and with have the clearance between the necking down section 6.
The power shaft 12 penetrates through the neck section 6 and then is in threaded connection with the impeller 4, as shown in fig. 2, the power shaft 12 is provided with a light rod section and a threaded section 121 arranged at the front end of the light rod section, and the power shaft 12 is in threaded connection with the impeller 4 through the threaded section 121. The power shaft 12 is used for driving the impeller 4 to rotate and forming a high-pressure area close to the motor casing and a low-pressure area far away from the motor casing in the pump body 3, a working medium inlet communicated with the low-pressure area is arranged on the pump body 3, as shown in fig. 1, an inlet cylinder 1 is fixed at the working medium inlet through a screw 2, and a working medium outlet (not shown in the figure) communicated with the high-pressure area is further arranged on the pump body 3.
As shown in fig. 1, a liquid outlet cavity 15 is defined between the cylindrical structures of the rear bearing 14, the power shaft 12 and the rear end cover 16, and as shown in fig. 2, a liquid flow channel 122 is provided in the power shaft 12, one end of the liquid flow channel 122 is communicated with the liquid outlet cavity 15, the other end of the liquid flow channel 122 penetrates out of the impeller 4, and a liquid outlet hole 123 communicated with the liquid flow channel 122 is provided on the penetrating end penetrating out of the impeller 4, the liquid outlet hole 123 extends along the radial direction of the power shaft 12 and is communicated with the low pressure region.
The front bearing 9 and the rear bearing 14 in this embodiment are both sliding bearings, and specifically, graphite bearings may be used, and the high-pressure region is communicated with the inside of the motor housing through a fit gap between the front bearing 9 and the power shaft 12, that is, a gap between a journal of the power shaft 12 and a bearing bush of the front bearing 9, so that liquid in the high-pressure region can enter the inside of the motor housing through the gap. Meanwhile, the liquid outlet cavity 15 is communicated with the interior of the motor shell through a fit clearance between the rear bearing 14 and the power shaft 12, the fit clearance is a clearance between a shaft neck of the power shaft 12 and a bearing bush of the rear bearing 14, and liquid in the motor shell can enter the liquid outlet cavity 15 through the clearance.
The utility model discloses a centrifugal pump is at the during operation, the liquid in high-pressure area is at first through the clearance between 4 terminal surfaces of impeller and the first connecting plate 5 get into in the necking section 6, then flow through the clearance between necking section 6 and powered shaft 12, then get into inside the motor casing through the fit clearance between front bearing 9 and the powered shaft 12, then the rear end in the motor casing flows through the clearance between stator 11 and the rotor 10, then get into out in the liquid chamber 15 through the fit clearance between rear bearing 14 and the powered shaft 12, flow passage 122 and play liquid hole 123 through in the powered shaft 12 at last flow direction low-pressure area, realize that the internal liquid of pump flows through the inside purpose of motor, thereby can take away the inside heat of motor, dispel the heat to the motor.
The utility model discloses what utilize is that the feed liquor is realized to fit clearance between front bearing and the power shaft, utilizes fit clearance between rear bearing and the power shaft to realize going out liquid simultaneously, and what utilize is the structure of the inside itself of motor, compares prior art, need not to process feed liquor hole and go out the liquid hole on motor casing, consequently can simplify the manufacturing process of motor, reduces manufacturing cost.
In other embodiments of the centrifugal pump, the front bearing and the rear bearing may also be rolling bearings which are not prone to rust, such as ceramic bearings, in which case the liquid in the high-pressure region can enter the interior of the motor housing through the gaps between the rolling elements inside the ceramic bearings, and similarly, the liquid in the motor housing can also enter the liquid outlet chamber through the gaps between the rolling elements inside the ceramic bearings.
In other embodiments of the centrifugal pump, one of the front bearing and the rear bearing may be a sliding bearing, and the other may be a rolling bearing.
In other embodiments of the centrifugal pump, the liquid flow channel may also penetrate through the power shaft along the axial direction of the power shaft, and the power shaft is a hollow shaft, further, a radial liquid outlet hole may also be provided at the end of the power shaft, or, of course, may not be provided, and when the radial liquid outlet hole is not provided, the end of the power shaft does not need to penetrate out of the impeller.
In other embodiments of the centrifugal pump, the connection structure and the pump body may be separate bodies, and need to be additionally fixed to the pump body.
In other embodiments of the centrifugal pump, an i-shaped connection structure may not be provided, for example, the end portion of the pump body is directly welded and fixed to the front end cover, that is, the front end cover is directly arranged opposite to the end surface of the impeller.
In other embodiments of the centrifugal pump, the power shaft and the impeller can be in transmission connection by adopting a key connection mode.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A centrifugal pump, comprising:
a pump body;
the impeller is arranged in the pump body;
the motor comprises a motor shell, the motor shell comprises a front end cover and a rear end cover, the pump body is fixedly connected with the front end cover, the front end cover and the rear end cover are respectively and rotatably provided with a power shaft through a front bearing and a rear bearing, a stator is arranged in the motor shell, a rotor is arranged on the power shaft, and a gap is formed between the stator and the rotor;
the power shaft penetrates through the front end cover to be in transmission connection with the impeller so as to drive the impeller to rotate and form a high-pressure area close to the motor shell and a low-pressure area far away from the motor shell in the pump body;
a liquid flow channel is arranged in the power shaft, a liquid outlet cavity is arranged at the rear end in the motor shell, the liquid outlet cavity is enclosed by a rear bearing, the power shaft and a rear end cover, one end of the liquid flow channel is communicated with the liquid outlet cavity, and the other end of the liquid flow channel is communicated with the low-pressure area;
the method is characterized in that: the high-pressure area is communicated with the inside of the motor shell through a fit clearance between the front bearing and the power shaft or an inner clearance of the front bearing, so that liquid in the high-pressure area can enter the inside of the motor shell through the fit clearance between the front bearing and the power shaft or the inner clearance of the front bearing, and the liquid outlet cavity is communicated with the inside of the motor shell through a fit clearance between the rear bearing and the power shaft or the inner clearance of the rear bearing, so that the liquid in the motor shell can enter the liquid outlet cavity through the fit clearance between the rear bearing and the power shaft or the inner clearance of the rear bearing.
2. The centrifugal pump of claim 1, wherein: the pump body passes through connection structure and front end housing fixed connection, connection structure is the I shape, connection structure include the first connecting plate that links to each other with the pump body, the second connecting plate that links to each other with the front end housing and set up the necking down section between first connecting plate and second connecting plate, the power shaft run through the necking down section and with have the clearance between the necking down section to make the liquid in high nip at first inside reentrant motor casing behind the necking down section.
3. The centrifugal pump of claim 2, wherein: the connecting structure and the pump body are integrally arranged.
4. A centrifugal pump according to any one of claims 1 to 3, characterized in that: the end part of the power shaft penetrates out of the impeller, a liquid outlet hole communicated with the liquid flow channel is arranged on the penetrating end of the power shaft, which penetrates out of the impeller, and the liquid outlet hole extends along the radial direction of the power shaft.
5. A centrifugal pump according to any one of claims 1 to 3, characterized in that: the liquid flow channel penetrates through the power shaft along the axial direction of the power shaft.
6. A centrifugal pump according to any one of claims 1 to 3, characterized in that: the power shaft is in threaded connection with the impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021277336.XU CN213088259U (en) | 2020-07-03 | 2020-07-03 | Centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021277336.XU CN213088259U (en) | 2020-07-03 | 2020-07-03 | Centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN213088259U true CN213088259U (en) | 2021-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021277336.XU Active CN213088259U (en) | 2020-07-03 | 2020-07-03 | Centrifugal pump |
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| CN (1) | CN213088259U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410954A (en) * | 2021-05-21 | 2021-09-17 | 成都凯天电子股份有限公司 | Self-circulation wet test motor for aviation electric pump |
-
2020
- 2020-07-03 CN CN202021277336.XU patent/CN213088259U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410954A (en) * | 2021-05-21 | 2021-09-17 | 成都凯天电子股份有限公司 | Self-circulation wet test motor for aviation electric pump |
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