Pipeline centrifugal pump

Abstract

The utility model provides a pipeline centrifugal pump, which relates to the field of fluid machinery and comprises a motor, a pump body assembly and a bracket, the motor and the pump body assembly are both arranged on the support, the pump body assembly comprises a pump body, an impeller and a pump shaft, the pump shaft is provided with a connecting section, the connecting section is provided with a cavity, an opening is formed in the end, close to the cavity, of the pump shaft, and an output shaft of the motor is inserted into the cavity through the opening and is in interference fit with the cavity wall of the cavity so that the pump shaft can be driven by the motor to rotate synchronously. The pump shaft is sleeved with the impeller, the impeller is located in the pump body, and the impeller is constructed to be driven by the pump shaft to rotate at a high speed so that liquid in the pump body can be pumped out under the action of centrifugal force. The utility model provides a pipeline centrifugal pump which is stable in connection and capable of reducing vibration.

Description

Technical Field

[0001] The present application relates to the field of fluid machinery, and in particular to a pipeline centrifugal pump. Background Art

[0002] Pipeline centrifugal pumps, also known as pipeline water pumps, are used to transport clean water and other liquids with physical and chemical properties similar to clean water. They are suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire-fighting booster, long-distance transportation, HVAC refrigeration cycle, etc.

[0003] At present, the vertical pipeline pump consists of a pump body, a motor, a coupling, an impeller, a mechanical seal, etc. The motor is connected to the pump body through a coupling, thereby driving the impeller in the pump body to rotate. After the medium enters the pump body, it is accelerated and pushed to the outlet under the action of the impeller. Due to the high-speed rotation of the pipeline pump, the medium can form a high-speed water flow in the pipeline, so that the medium can be transported efficiently and stably. When the pump stops running, the medium also stops flowing, thus forming a closed loop to achieve the purpose of energy saving.

[0004] However, this traditional pipeline pump will generate a large axial force when operating hydraulically, causing the coupling to loosen, the connection to be unstable, and it is also easy to cause damage to the motor bearings and impeller. Utility Model Content

[0005] The embodiment of the present application provides a pipeline centrifugal pump with a stable connection, which can reduce vibration and reduce damage to the motor bearings and impeller.

[0006] The present application provides a pipeline centrifugal pump, including a motor, a pump body assembly, a bracket and a bearing assembly; the motor and the pump body assembly are both arranged on the bracket, the pump body assembly includes a pump body, an impeller and a pump shaft, the pump shaft has a connecting section, the connecting section has a cavity, the end of the pump shaft close to the cavity has an opening, the output shaft of the motor is inserted into the cavity through the opening, and has an interference fit with the cavity wall of the cavity, so that the pump shaft rotates synchronously under the drive of the motor; the bearing assembly includes a first bearing and a second bearing, the first bearing is supported between the outer side of the connecting section and the bracket, and the second bearing is supported between the end of the pump shaft away from the connecting section and the inner wall of the pump body; the impeller is sleeved on the pump shaft, and the impeller is located inside the pump body, and the impeller is constructed to rotate at high speed under the drive of the pump shaft, so that the liquid in the pump body is pumped out under the action of centrifugal force.

[0007] As in the pipeline centrifugal pump mentioned above, optionally, the pump body assembly also includes a top screw; the pump shaft has a mounting hole, the mounting hole extends radially along the pump shaft, and the mounting hole connects the cavity and the outside of the pump shaft, the top screw is screwed into the mounting hole, and the end of the top screw abuts against the output shaft of the motor.

[0008] As in the pipeline centrifugal pump mentioned above, optionally, the bearing assembly further includes a first locking nut, which is screwed onto the pump shaft and abuts against the end of the second bearing away from the connecting section to axially limit the second bearing.

[0009] As in the pipeline centrifugal pump mentioned above, optionally, the bearing assembly further includes a third bearing and a second locking nut, the third bearing is sleeved on the pump shaft, and the third bearing is located between the first bearing and the second bearing.

[0010] As in the pipeline centrifugal pump mentioned above, optionally, the pump body has a limiting portion abutting against the side of the third bearing facing away from the motor; the second locking nut is screwed onto the pump shaft, and the side of the third bearing facing away from the limiting portion abuts against the second locking nut.

[0011] As in the above-mentioned pipeline centrifugal pump, optionally, a sealing device is provided at one end of the pump body close to the bracket, and the sealing device includes a sealing member and a sealing gland, and the sealing member and the sealing gland are sequentially sleeved on the pump shaft along the axial direction of the pump shaft.

[0012] As in the above pipeline centrifugal pump, optionally, the pump body includes a sealing flushing pipe, a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are respectively arranged at both ends of the pump body, and the water inlet pipe is connected with the water outlet pipe, and the liquid inside the water inlet pipe is pressurized under the rotation of the impeller and output through the water outlet pipe;

[0013] The sealing flushing pipe is connected to the water outlet pipe and the sealing gland, and the two ends of the sealing flushing pipe are respectively penetrated through the pipe wall of the water outlet pipe and the end wall of the sealing gland, so that the pressure liquid in the water outlet pipe can flow to the seal and flush the seal.

[0014] As in the pipeline centrifugal pump mentioned above, optionally, the sealing flushing pipe includes a filter port and a valve; the filter port is arranged at the first end of the sealing flushing pipe to filter the water quality for flushing the seal, the valve is arranged between the first end and the second end of the sealing flushing pipe, and the valve is electrically connected to the controller, and the controller is constructed to control the opening and closing state of the valve.

[0015] As in the pipeline centrifugal pump mentioned above, optionally, a pressure gauge and a pressure relief valve are provided at the outlet pipe, and the pressure relief valve is constructed to open when the pressure value detected by the pressure gauge is greater than a set value, so that the pressure at the outlet pipe is less than or equal to the set value.

[0016] The utility model provides a pipeline centrifugal pump, including a motor, a pump body assembly, a bracket and a bearing assembly; the motor and the pump body assembly are both arranged on the bracket, the pump body assembly includes a pump body, an impeller and a pump shaft, the pump shaft has a connecting section, the connecting section has a cavity, the pump shaft has an opening at one end close to the cavity, the output shaft of the motor is inserted into the cavity through the opening, and has an interference fit with the cavity wall of the cavity, so that the pump shaft rotates synchronously under the drive of the motor; the impeller is sleeved on the pump shaft, and the impeller is located inside the pump body, and the impeller is constructed to rotate at a high speed under the drive of the pump shaft, so that the liquid in the pump body is pumped out under the action of centrifugal force. The pipeline centrifugal pump provided by the utility model has a stable connection, can reduce vibration, and reduce damage to the motor bearings and impeller.

[0017] The structure of a pipeline centrifugal pump provided by the utility model and its other utility model purposes and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a pipeline centrifugal pump provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 It is a structural schematic diagram of a seal flushing device in a pipeline centrifugal pump provided in an embodiment of the present application;

[0021] Figure 4 It is a structural schematic diagram of a sealing device in a pipeline centrifugal pump provided in an embodiment of the present application;

[0022] Figure 5 It is a schematic structural diagram of another sealing device in a pipeline centrifugal pump provided in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 10- pipeline centrifugal pump; 100- motor; 110- output shaft; 200- bracket; 300- pump body assembly; 310- pump body; 311- seal flushing pipe; 312- outlet pipe; 313- inlet pipe; 314- filter port; 315- valve; 320- impeller; 330- pump shaft; 331- connecting section; 340- top screw; 400- bearing assembly; 410- first bearing; 420- second bearing; 421- first locking nut; 430- third bearing; 431- second locking nut; 432- bearing gland; 433- machine seal sleeve; 500- sealing device; 510- seal; 520- seal gland; 530- compensation structure; 540- moving ring; 550- static ring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Pipeline centrifugal pumps, also known as pipeline water pumps, are used to transport clean water and other liquids with physical and chemical properties similar to clean water. They are suitable for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire-fighting booster, long-distance transportation, HVAC refrigeration cycle, etc.

[0027] At present, the vertical pipeline pump consists of a pump body, a motor, a coupling, an impeller, a mechanical seal, etc. The motor is connected to the pump body through a coupling, thereby driving the impeller in the pump body to rotate. After the medium enters the pump body, it is accelerated and pushed to the outlet under the action of the impeller. Due to the high-speed rotation of the pipeline pump, the medium can form a high-speed water flow in the pipeline, so that the medium can be transported efficiently and stably. When the pump stops running, the medium also stops flowing, thus forming a closed loop to achieve the purpose of energy saving.

[0028] However, this traditional pipeline pump will generate a large axial force when operating hydraulically, causing the coupling to loosen, the connection to be unstable, and it is also easy to cause damage to the motor bearings and impeller.

[0029] To this end, the present application provides a pipeline centrifugal pump, which adopts a design in which the pump shaft and the motor shaft are interference fit, so that the connection between the pump shaft and the output shaft of the motor is more tightly connected; the design in which at least two mechanical bearings are sleeved on the pump shaft can reduce the water thrust during the operation of the pump body, thereby ensuring the reliable and stable operation of the pump body during high-speed operation; the design in which a sealing flushing pipe is provided at the outlet pipe can use the pressure liquid at the outlet pipe to flush the sealing device, so as to prevent sediment from adhering to the surface of the sealing device and making the sealing effect worse. Compared with the traditional pipeline centrifugal pump, the present device has a stable connection, can reduce vibration, and reduce damage to the motor bearings and impeller.

[0030] A pipeline centrifugal pump in this embodiment is further described below.

[0031] Figure 1 This is a front view of a pipeline centrifugal pump provided in an embodiment of the present application; Figure 2 yes Figure 1 A partial enlarged view of the middle A; Figure 3 It is a structural schematic diagram of a seal flushing device in a pipeline centrifugal pump provided in an embodiment of the present application; Figure 4It is a structural schematic diagram of a sealing device in a pipeline centrifugal pump provided in an embodiment of the present application; Figure 5 It is a schematic structural diagram of another sealing device in a pipeline centrifugal pump provided in an embodiment of the present application.

[0032] like Figure 1 As shown, the embodiment of the present application provides a pipeline centrifugal pump 10, including a motor 100, a pump body assembly 300, a bracket 200 and a bearing assembly 400; the motor 100 and the pump body assembly 300 are both arranged on the bracket 200, the pump body assembly 300 includes a pump body 310, an impeller 320 and a pump shaft 330, the pump shaft 330 has a connecting section 331, the connecting section 331 has a cavity, and the end of the pump shaft 330 close to the cavity has an opening, the output shaft 110 of the motor 100 is inserted into the cavity through the opening, and has an interference fit with the cavity wall of the cavity, so that the pump shaft 3 30 rotates synchronously driven by the motor 100; the bearing assembly 400 includes a first bearing 410 and a second bearing 420, the first bearing 410 is supported between the outer side of the connecting section 331 and the bracket 200, the second bearing 420 is supported between the end of the pump shaft 330 away from the connecting section 331 and the inner wall of the pump body 310, the impeller 320 is sleeved on the pump shaft 330, and the impeller 320 is located inside the pump body 310, and the impeller 320 is constructed to rotate at a high speed driven by the pump shaft 330, so that the liquid in the pump body 310 is pumped out under the action of centrifugal force.

[0033] The design of the pump shaft 330 and the output shaft 110 of the motor 100 being interference fit makes the connection between the pump shaft 330 and the output shaft 110 of the motor 100 more secure; the design of sleeved at least two mechanical bearings on the pump shaft 330 can reduce the water thrust during the operation of the pump body 310, thereby ensuring the reliable and stable operation of the pump body 310 during high-speed operation; the design of setting a sealing flushing pipe 311 at the outlet pipe 312 can use the pressure liquid at the outlet pipe 312 to flush the sealing device 500, preventing sediment from adhering to the surface of the sealing device 500, which makes the sealing effect worse. Compared with the traditional pipeline centrifugal pump, the device has a stable connection, can reduce vibration, and reduce damage to the motor bearings and impeller.

[0034] In this embodiment, the type of pipeline centrifugal pump 10 is a vertical pipeline centrifugal pump. Specifically, before working, the pump body 310 and the water inlet pipe 313 must be filled with liquid to form a vacuum state. When the impeller 320 rotates rapidly, the blades cause the liquid to rotate quickly, so that the liquid flies out of the impeller 320 under the action of centrifugal force. After the liquid in the pump body 310 is thrown out, a vacuum area is formed in the center of the impeller 320. The liquid inside the liquid source is pressed into the water inlet pipe 313 through the pipe network under the action of atmospheric pressure (or water pressure), and a reciprocating cycle is performed to achieve continuous pumping.

[0035] Among them, the impeller 320 is the core component of the pipeline centrifugal pump 10. During operation, the impeller 320 will rotate at high speed. Therefore, in order to prevent the high-pressure liquid inside the pump body 310 from entering the low-pressure area of ​​the bracket 200 due to the large gap between the impeller 320 and the pump casing when the impeller 320 rotates at high speed, a sealing device 500 is set at the connection between the pump body 310 and the bracket 200.

[0036] Specifically, in order to prevent pollutants from contaminating the sealing device 500 and causing the sealing element 510 to overheat and wear, the sealing flushing pipe 311 is used to flush the sealing element 510 to reduce the temperature of the sealing element 510 and extend the service life of the sealing device 500.

[0037] Among them, the upper end of the pump shaft 330 and the output shaft 110 of the motor 100 are connected by interference fit. The purpose of this setting is to make the pump shaft 330 and the output shaft 110 of the motor 100 have good coaxiality, and to enable the pump shaft 330 to maintain a high precision during the swinging process, thereby improving the stability and reliability of the transmission and reducing the transmission noise.

[0038] In some embodiments, the pump body assembly 300 further includes a top screw 340; the pump shaft 330 has a mounting hole, the mounting hole extends along the radial direction of the pump shaft 330, and the mounting hole communicates the cavity and the outer side of the pump shaft 330, the top screw 340 is screwed into the mounting hole, and the end of the top screw 340 abuts against the output shaft 110 of the motor 100. It can be understood that the hole wall of the mounting hole has an internal thread that matches the thread of the top screw.

[0039] Among them, Figure 5 As shown, the purpose of setting the top screw 340 at the connection between the pump shaft 330 and the output shaft 110 of the motor 100 is to achieve circumferential positioning of the pump shaft 330, so as to prevent the output shaft 110 of the motor from being worn out during long-term operation of the pipeline centrifugal pump 10, resulting in loosening and loose fixation of the connection between the output shaft 110 of the motor 100 and the pump shaft 330, thereby affecting the performance of the pipeline centrifugal pump 10.

[0040] The impeller 320 generates a large axial force when rotating at a high speed. Therefore, in order to prevent the pump shaft 330 from generating a large vibration under the action of the impeller 320 , at least two mechanical bearings are provided on the pump shaft 330 .

[0041] Among them, as an optional implementation, the type of mechanical bearing is selected as a rolling bearing. The purpose of this setting is that the rolling bearing has a high load-bearing capacity and can serve for a long time under high-speed rotation conditions. The rolling bearing also has low friction resistance and high mechanical efficiency.

[0042] In some embodiments, the bearing assembly 400 further includes a first locking nut 421 , which is screwed onto the pump shaft 330 and abuts against an end of the second bearing 420 away from the connecting section 331 to limit the axial position of the second bearing 420 .

[0043] The impeller 320 and the pump shaft 330 are key-connected for transmitting torque, and a first locking nut 421 is used to limit the axial position of the second bearing 420 to balance the axial force generated by unstable fluid flow and prevent the pump shaft 330 from shaking when the impeller 320 rotates at high speed.

[0044] Specifically, Figure 2 As shown, an organic seal sleeve 433 is provided at one end of the pump shaft 330 close to the impeller 320 to protect the pump shaft 330 and axially position the impeller 320 . In addition, the organic seal sleeve 433 can also prevent the liquid from directly eroding and corroding the pump shaft 330 .

[0045] In some embodiments, the bearing assembly 400 also includes a third bearing 430 and a second locking nut 431. The third bearing 430 is sleeved on the pump shaft 330, and the third bearing 430 is located between the first bearing 410 and the second bearing 420. The purpose of this arrangement is that the third bearing 430 and the first bearing 410 and the second bearing 420 jointly support the pump shaft 330, which can reduce the friction coefficient of the pump shaft 330 during movement, ensure its rotation accuracy, and extend the service life of the pump shaft 330.

[0046] In some embodiments, the pump body 310 has a limiting portion that abuts against the side of the third bearing 430 away from the motor 100; the second locking nut 431 is screwed onto the pump shaft 330, and the side of the third bearing 430 away from the limiting portion abuts against the second locking nut 431.

[0047] Among them, the purpose of setting the second locking nut 431 on the pump shaft 330 is to make the pump shaft 330 generate a larger pre-tightening force to enhance the reliability and tightness of the connection of the pump shaft 330 and prevent the pump shaft 330 and the third bearing 430 from sliding relative to each other after the pump shaft 330 is loaded, thereby generating noise.

[0048] In some embodiments, a sealing device 500 is provided at one end of the pump body 310 close to the bracket 200 , and the sealing device 500 includes a sealing member 510 and a sealing gland 520 , which are sequentially sleeved on the pump shaft 330 along the axial direction of the pump shaft 330 .

[0049] Among them, Figure 2As shown, the seal 510 is arranged below the sealing cover 520, and a through hole is provided at the sealing cover 520. The second end of the sealing flushing pipe 311 passes through the through hole and abuts against the sealing device 500, so that the high-pressure water at the water outlet pipe 312 flows to the seal 510 and flushes the seal 510.

[0050] The sealing member 510 includes a stationary ring 550, a dynamic ring 540 and a compensation structure 530. Figure 4 As shown, the compensation structure 530 mainly provides axial pressure for the sealing end faces of the dynamic ring 540 and the static ring 550, so that the axial sealing surfaces always keep in contact and the end faces are kept stable.

[0051] Specifically, to prevent leakage, a liquid film should be formed on the friction end faces of the dynamic ring 540 and the static ring 550 to seal, balance pressure and lubricate the end faces. Without a liquid film, dry grinding of the end faces will occur, resulting in severe wear of the end faces, generating a large amount of frictional heat and damaging the sealing device 500. Therefore, this embodiment uses a sealing flushing tube 311 to cool and lubricate the end faces of the dynamic ring 540 and the static ring 550 to maintain normal formation of the liquid film.

[0052] Among them, Figure 1 As shown, a bearing cover 432 is arranged on the upper part of the third bearing 430, and the bearing cover 432 adopts an internal installation method, so that the inner end surface of the bearing cover 432 can be better stressed and the leakage is less. Specifically, the type of the sealing device 500 can be selected as a single-sided seal or a double-sided plate seal, wherein, as an optional implementation, a single-sided seal is adopted in this embodiment.

[0053] In some embodiments, the pump body 310 includes a sealing flushing pipe 311, a water inlet pipe 313 and a water outlet pipe 312. The water inlet pipe 313 and the water outlet pipe 312 are respectively arranged at both ends of the pump body 310, and the water inlet pipe 313 is connected with the water outlet pipe 312. The liquid inside the water inlet pipe 313 is pressurized under the rotation of the impeller 320 and output through the water outlet pipe 312; the sealing flushing pipe 311 is connected with the water outlet pipe 312 and the sealing gland 520;

[0054] The two ends of the sealing flushing pipe 311 are respectively penetrated through the pipe wall of the water outlet pipe 312 and the end wall of the sealing gland 520 , so that the pressure liquid in the water outlet pipe 312 can flow to the sealing element 510 and flush the sealing element 510 .

[0055] Among them, a mounting boss is provided at the water outlet pipe 312, and a through hole is provided inside the mounting boss. Specifically, the through hole is an internal threaded hole. The first end of the sealing flushing pipe 311 is screwed into the through hole, and the second end of the sealing flushing pipe 311 is passed through the wall surface of the bracket 200 so that the pressure liquid at the water outlet pipe 312 can be transmitted to the sealing device 500.

[0056] Among them, the first end of the sealed flushing pipe 311 is provided with a hollow threaded joint for transporting the pressure liquid at the outlet pipe 312 to the sealed flushing pipe 311. Specifically, the threaded joint can be integrally formed with the sealed flushing pipe 311, or can be connected together by assembly.

[0057] In some embodiments, the sealed flushing tube 311 includes a filter port 314 and a valve 315; the filter port 314 is arranged at the first end of the sealed flushing tube 311 to filter the water quality for flushing the seal 510, and the valve 315 is arranged between the first end and the second end of the sealed flushing tube 311, and the valve 315 is electrically connected to the controller, and the controller is constructed to control the opening and closing state of the valve 315.

[0058] Among them, the filter port 314 is arranged at the first end of the sealing flushing tube 311 to filter the water quality for flushing the seal 510, the valve 315 is arranged between the first end and the second end of the sealing flushing tube 311, and the valve 315 is electrically connected to the controller and is constructed to open when the seal 510 needs to be flushed to flush the seal 510.

[0059] Among them, a limiting flow orifice (not shown in the figure) is connected to the water outlet pipe 312 of the pump body 310. The purpose of setting the limiting flow orifice is to reduce the pressure of the pressure liquid at the water outlet pipe 312 and transfer it to the sealing device 500. Specifically, the limiting flow orifice needs to ensure sufficient flow rate passing through, which can be suitable for clean non-high temperature and non-polymeric media in the pump body 310.

[0060] In some embodiments, a pressure gauge and a pressure relief valve are provided at the water outlet pipe 312 , and the pressure relief valve is configured to open when the pressure value detected by the pressure gauge is greater than a set value, so that the pressure at the water outlet pipe 312 is less than or equal to the set value.

[0061] Specifically, in actual production, the sealing water pressure is slightly higher than the pump body 310 inlet pressure by at least 0.10 MPa before entering the shaft seal, which can achieve a sealing effect. In this embodiment, the purpose of providing a pressure gauge at the water outlet is to detect the pressure value at the outlet pipe 312 in real time, which has practical guiding significance. Among them, the purpose of providing a pressure relief valve at the outlet pipe 312 is to prevent the pressure of the pipeline system from exceeding the rated working pressure of the pipeline centrifugal pump 10, causing the pipeline centrifugal pump 10 to be overloaded or damaged.

[0062] Specifically, it is very important to ensure that the flow channel width is evenly distributed in the design of the water inlet pipe 313. Too large or too small a width difference will lead to uneven water inflow, thereby reducing the water absorption capacity of the pump body 310. Therefore, the flow channel width distribution should be reasonably determined according to actual needs and fluid properties to ensure that the fluid can enter the pump body 310 evenly.

[0063] Specifically, the radius of curvature is one of the important parameters in the water inlet pipe 313, which determines the path of the fluid flow. An excessively large radius of curvature will increase the resistance loss of the fluid and reduce the efficiency of the pipeline centrifugal pump 10. Therefore, the interior of the water inlet pipe 313 adopts an arc transition, the purpose of which is to reduce the radius of curvature, so as to reduce the resistance loss of the fluid flow and improve the working efficiency of the pipeline centrifugal pump 10.

[0064] Among them, the water inlet and the water outlet have the same diameter, and the water inlet and the water outlet are arranged on the same straight line. The purpose of this arrangement is to install the pipeline centrifugal pump 10 in series at any position of the pipeline, and to facilitate the liquid to flow out of the pipeline and reduce water flow resistance.

[0065] Among them, as an optional implementation, the present embodiment adopts front and rear cover plates on both sides of the blade, which has high efficiency and is suitable for conveying clean liquid without impurities.

[0066] The present embodiment provides a pipeline centrifugal pump 10, including a motor 100, a pump body assembly 300, a bracket 200 and a bearing assembly 400; the motor 100 and the pump body assembly 300 are both arranged on the bracket 200, the pump body assembly 300 includes a pump body 310, an impeller 320 and a pump shaft 330, the pump shaft 330 has a connecting section 331, the connecting section 331 has a cavity, and the pump shaft 330 has an opening at one end close to the cavity, the output shaft 110 of the motor 100 is inserted into the cavity through the opening, and has an interference fit with the cavity wall of the cavity, so that the pump shaft 330 Driven by the motor 100, they rotate synchronously; the bearing assembly 400 includes a first bearing 410 and a second bearing 420, the first bearing 410 is supported between the outer side of the connecting section 331 and the bracket 200, and the second bearing 420 is supported between the end of the pump shaft 330 that is away from the connecting section 331 and the inner wall of the pump body 310, the impeller 320 is sleeved on the pump shaft 330, and the impeller 320 is located inside the pump body 310, and the impeller 320 is constructed to rotate at a high speed driven by the pump shaft 330 so that the liquid in the pump body 310 is pumped out under the action of centrifugal force. The design of the pump shaft 330 and the output shaft 110 of the motor 100 being interference fit makes the connection between the pump shaft 330 and the output shaft 110 of the motor 100 more secure; the design of sleeved at least two mechanical bearings on the pump shaft 330 can reduce the water thrust during the operation of the pump body 310, thereby ensuring the reliable and stable operation of the pump body 310 during high-speed operation; the design of setting a sealing flushing pipe 311 at the outlet pipe 312 can use the pressure liquid at the outlet pipe 312 to flush the sealing device 500, preventing sediment from adhering to the surface of the sealing device 500, which makes the sealing effect worse. Compared with the traditional pipeline centrifugal pump, the device has a stable connection, can reduce vibration, and reduce damage to the motor bearings and impeller.

[0067] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0068] In general, terms should be understood, at least in part, by the context in which they are used. For example, the terms "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "an" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0069] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0070] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A pipeline centrifugal pump, characterized in that: It comprises a motor, a pump assembly, a bracket and a bearing assembly; the motor and the pump assembly are both arranged on the bracket, the pump assembly comprises a pump body, an impeller and a pump shaft, the pump shaft has a connecting section, the connecting section has a cavity, the pump shaft has an opening at one end close to the cavity, the output shaft of the motor is inserted into the cavity through the opening, and is interference fit with the cavity wall of the cavity, so that the pump shaft rotates synchronously under the drive of the motor; The bearing assembly comprises a first bearing and a second bearing, wherein the first bearing is supported between the outer side of the connecting section and the bracket, and the second bearing is supported between an end of the pump shaft away from the connecting section and the inner wall of the pump body; The impeller is sleeved on the pump shaft and located inside the pump body. The impeller is configured to rotate at a high speed driven by the pump shaft so that the liquid in the pump body is pumped out under the action of centrifugal force.

2. The pipeline centrifugal pump according to claim 1, characterized in that: The pump body assembly also includes a top screw; The pump shaft has a mounting hole, which extends radially along the pump shaft and communicates with the cavity and the outer side of the pump shaft. The top screw is screwed into the mounting hole, and the end of the top screw abuts against the output shaft of the motor.

3. The pipeline centrifugal pump according to claim 2, characterized in that: The bearing assembly further includes a first locking nut, which is screwed onto the pump shaft and abuts against an end of the second bearing away from the connecting section to axially limit the second bearing.

4. The pipeline centrifugal pump according to claim 2, characterized in that: The bearing assembly further includes a third bearing and a second locking nut. The third bearing is sleeved on the pump shaft and is located between the first bearing and the second bearing.

5. The pipeline centrifugal pump according to claim 4, characterized in that: The pump body has a limiting portion abutting against a side of the third bearing away from the motor; The second locking nut is screwed onto the pump shaft, and a side of the third bearing that is away from the limiting portion abuts against the second locking nut.

6. The pipeline centrifugal pump according to claim 1 or 2, characterized in that: A sealing device is arranged at one end of the pump body close to the bracket. The sealing device comprises a sealing member and a sealing gland. The sealing member and the sealing gland are sequentially sleeved on the pump shaft along the axial direction of the pump shaft.

7. The pipeline centrifugal pump according to claim 6, characterized in that: The pump body comprises a sealing flushing pipe, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively arranged at two ends of the pump body, and the water inlet pipe is communicated with the water outlet pipe, and the liquid inside the water inlet pipe is pressurized under the rotation of the impeller and outputted through the water outlet pipe; The sealing flushing pipe is connected to the water outlet pipe and the sealing pressure cover, and the two ends of the sealing flushing pipe are respectively penetrated through the pipe wall of the water outlet pipe and the end wall of the sealing pressure cover, so that the pressure liquid in the water outlet pipe can flow to the sealing component and flush the sealing component.

8. The pipeline centrifugal pump according to claim 7, characterized in that: The sealed flushing pipe includes a filter port and a valve; The filter port is arranged at the first end of the sealing flushing pipe to filter the water used to flush the seal. The valve is arranged between the first end and the second end of the sealing flushing pipe, and the valve is electrically connected to the controller, and the controller is constructed to control the opening and closing state of the valve.

9. The pipeline centrifugal pump according to claim 8, characterized in that: A pressure gauge and a pressure relief valve are provided at the water outlet pipe. The pressure relief valve is configured to open when the pressure value detected by the pressure gauge is greater than a set value, so that the pressure at the water outlet pipe is less than or equal to the set value.

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