An impeller assembly and a delivery pump

Abstract

The embodiment of the present application provides an impeller assembly and a delivery pump, belonging to the technical field of pumping equipment. The impeller assembly has a rotation centerline and a flow channel located around the rotation centerline. The impeller assembly includes two impeller bodies, each of which rotates around the rotation centerline. The two impeller bodies are arranged relative to each other along the extension direction of the rotation centerline. The two impeller bodies are arranged to form a flow channel. The two impeller bodies change the flow area of the flow channel by approaching or moving away from each other to adjust the flow rate of the flow channel. By moving the two impeller bodies closer to or away from each other, the flow area of the flow channel changes, thereby adjusting the flow rate of the delivery pump. During the flow rate regulation process of the delivery pump, there is no need to change the rotation speed of the impeller body, so there is no need to add a frequency converter to the power grid, which reduces the pollution caused to the power grid by the delivery pump during the flow regulation process.

Description

Technical Field

[0001] The present application relates to the technical field of pumping equipment, and in particular to an impeller assembly and a delivery pump. Background Art

[0002] During the use of the delivery pump, it may be necessary to adjust the flow of the delivery pump. In related technologies, it is often necessary to adjust the output power of the motor that drives the impeller to rotate based on the frequency converter, resulting in high cost of flow regulation of the delivery pump, and the flow regulation method of the delivery pump may cause power grid pollution. Summary of the Invention

[0003] In view of this, embodiments of the present application hope to provide an impeller assembly and a delivery pump to reduce the cost of flow regulation and the pollution to the power grid during the flow regulation process.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides, on the one hand, an impeller assembly having a rotation center line and a flow channel located around the rotation center line, the impeller assembly including two impeller bodies, each of the impeller bodies rotates around the rotation center line, the two impeller bodies are arranged relative to each other along the extension direction of the rotation center line, the two impeller bodies are arranged to form the flow channel, and the two impeller bodies change the flow area of the flow channel by approaching or moving away from each other to adjust the flow rate of the flow channel.

[0005] In one embodiment, the impeller body includes blades, and the blades of the two impeller bodies are partially overlapped to limit leakage of the fluid in the flow channel from between the blades of the two impeller bodies.

[0006] In one embodiment, the blades of the two impeller bodies are sealed to limit leakage of the fluid in the flow channel from between the blades of the two impeller bodies.

[0007] In one embodiment, the impeller assembly further includes a shaft assembly, the impeller body is sleeved on the shaft assembly, and the impeller body is capable of moving along the axial direction of the shaft assembly.

[0008] In one embodiment, the shaft assembly comprises:

[0009] Install the shaft; and

[0010] A shaft sleeve is sleeved on the mounting shaft, the shaft sleeve can move axially along the mounting shaft, at least one impeller body is sleeved on the shaft sleeve, and the shaft sleeve is used to drive the impeller body to move axially relative to the mounting shaft.

[0011] In one embodiment, the sleeve comprises:

[0012] a first sub-shaft sleeve, sleeved on the mounting shaft, the first sub-shaft sleeve being movable along the axial direction of the mounting shaft and rotating along with the mounting shaft, the corresponding impeller body being sleeved on the first sub-shaft sleeve so that the corresponding impeller body rotates along with the first sub-shaft sleeve, and a first shaft shoulder being formed at one end of the first sub-shaft sleeve; and

[0013] The second sub-sleeve is sleeved on the mounting shaft, and the second sub-sleeve is capable of moving axially along the mounting shaft. The second sub-sleeve is installed on the end of the first sub-sleeve away from the first shoulder. The second sub-sleeve is formed with a second shoulder. The area between the first shoulder and the second shoulder is used to at least partially accommodate the corresponding impeller body to limit the axial movement of the corresponding impeller body along the mounting shaft.

[0014] In one embodiment, an internal spline is formed on the inner side of each of the first sub-shaft sleeves, an external spline is formed on the mounting shaft that engages with the internal spline, and an outer side of the first sub-shaft sleeve is fixedly connected to the impeller body.

[0015] In one embodiment, there are two shaft sleeves, which are arranged opposite to each other along the axial direction of the mounting shaft. The impeller assembly further includes a sealing sleeve, which is located at one end of the two impeller bodies close to each other. The shaft sleeve and the corresponding impeller body are sealed by the sealing sleeve to prevent the fluid in the flow channel from leaking from between the two impeller bodies. The sealing sleeve is spanned between the two shaft sleeves to prevent the fluid in the flow channel from leaking from between the two shaft sleeves.

[0016] In one embodiment, one end of the two impeller bodies that are close to each other is surrounded by a sealing groove, and the sealing sleeve is installed in the sealing groove. The sealing groove has two annular grooves arranged opposite to each other along the axial direction of the installation shaft, and the sealing sleeve is formed with two mounting protrusions arranged opposite to each other along the axial direction of the installation shaft, each of the mounting protrusions is located in the corresponding annular groove, and each of the mounting protrusions is respectively in sealing contact with the corresponding shaft sleeve and impeller body to constrain the mounting protrusion in the annular groove.

[0017] In one embodiment, the number of the bushings is two, and the two bushings are arranged opposite to each other along the axial direction of the mounting shaft, and the mounting shaft includes:

[0018] Two first shaft segments, each of which corresponds to the first sub-shaft sleeve and the second sub-shaft sleeve, and the first sub-shaft sleeve and the second sub-shaft sleeve are both capable of moving along the axial direction of the corresponding first shaft segment; and

[0019] The second shaft segment is connected between the two first shaft segments, and the two first sub-shaft sleeves are both sleeved on the second shaft segment. The diameter of the second shaft segment is larger than the diameter of the first shaft segment, and the two ends of the second shaft segment can respectively abut against the corresponding end portions of the internal spline to position the corresponding first sub-shaft sleeve.

[0020] In one embodiment, the second shaft segment is sealed to the two first sub-shaft sleeves to prevent the fluid in the flow channel from leaking from between the second shaft segment and the first sub-shaft sleeves.

[0021] In one embodiment, the mounting shaft is key-connected to the shaft sleeve.

[0022] In one embodiment, the impeller assembly further includes a connecting mechanism connected to the shaft sleeve, and the connecting mechanism is capable of rotating around the shaft sleeve.

[0023] A second aspect of an embodiment of the present application provides a delivery pump, characterized by comprising:

[0024] An impeller assembly of any of the above; and

[0025] The impeller assembly is mounted on the pump casing, and the impeller assembly rotates around a rotation center line to transport the fluid in the pump casing.

[0026] In one embodiment, the delivery pump further includes two traction mechanisms, each of the traction mechanisms is connected to the corresponding impeller body, and each of the traction mechanisms drives the corresponding impeller body to move so that the two impeller bodies move closer to or farther away from each other.

[0027] The impeller assembly of the embodiment of the present application is such that when the two impeller bodies approach each other, the width of the flow channel decreases, and accordingly, the flow area of the flow channel decreases. Under the condition that the impeller body speed remains basically unchanged, the flow rate of the delivery pump can be reduced to a certain extent. When the two impeller bodies move away from each other, the width of the flow channel increases, and accordingly, the flow area of the flow channel increases. Under the condition that the impeller body speed remains basically unchanged, the flow rate of the delivery pump can be increased to a certain extent. By moving the two impeller bodies closer to and farther away from each other, the flow area of the flow channel changes, thereby regulating the flow rate of the delivery pump. During the flow regulation process of the delivery pump, there is no need to change the speed of the motor, and therefore there is no need to add a frequency converter to the power grid, reducing the cost of flow regulation of the delivery pump and reducing the pollution caused to the power grid by the delivery pump during the flow regulation process. It can be understood that when the impeller body speed remains unchanged and the flow rate of the flow channel changes, the output power of the motor driving the impeller body to rotate will change accordingly, and there is no need for a frequency converter to change the output power of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an impeller assembly according to an embodiment of the present application;

[0029] Figure 2 This is an assembly diagram of two impeller bodies according to an embodiment of the present application. The diagram shows the position states of the two impeller bodies when the flow passage area is minimum. The number of the second overlapping portion in the diagram is one.

[0030] Figure 3 This is an exploded view of two impeller bodies according to an embodiment of the present application, in which the number of the second overlapping portion is one;

[0031] Figure 4 for Figure 1 Cross-sectional view at position AA;

[0032] Figure 5 This is an exploded view of two impeller bodies according to an embodiment of the present application, in which there are two second overlapping portions;

[0033] Figure 6 This is a structural diagram of a mounting shaft according to an embodiment of the present application;

[0034] Figure 7 This is a schematic diagram of two shaft sleeves arranged relative to each other according to an embodiment of the present application;

[0035] Figure 8 This is a schematic structural diagram of a shaft sleeve according to an embodiment of the present application;

[0036] Figure 9 for Figure 1 An enlarged view of position B in the middle, showing the sealing sleeve;

[0037] Figure 10 for Figure 1 An enlarged view of the middle position B, wherein the sealing sleeve is not shown;

[0038] Figure 11 This is a schematic structural diagram of a sealing sleeve according to an embodiment of the present application.

[0039] Explanation of the reference numerals: flow channel 1; impeller body 2; hub 21; third shoulder 211; first blade 221; first overlapping portion 2211; first stop platform 2212; second blade 222; second overlapping portion 2221; second stop platform 2222; front cover 23; mounting shaft 3; external spline 31; first shaft section 32; second shaft section 33; sleeve 4; first sub-sleeve 41; first shoulder 411; internal spline 412; sealing section 413; second sub-sleeve 42; second shoulder 421; flat key 5; sealing sleeve 6; mounting cam 61; sealing groove 7; annular groove 71; connecting mechanism 8; block 9; shaft assembly 300. DETAILED DESCRIPTION

[0040] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0041] In the description of the embodiments of the present application, the directions "inside" and "outside" are based on the rotation centerline as a reference, radially toward the rotation centerline is "inside", and radially away from the rotation centerline is "outside".

[0042] It is understandable that the flow rate of a delivery pump is related to parameters such as power, pressure, and speed. In related technologies, the flow rate of a delivery pump is primarily regulated by changing the output power of the motor, primarily by adding a frequency converter to the drive circuit. While the frequency converter can easily adjust the motor's output power, it results in high flow rate regulation costs for the delivery pump. Furthermore, the frequency converter, as a load on the power grid, can introduce electromagnetic harmonic pollution to the grid. The flow rate of a delivery pump is not only related to factors such as power and speed; changes in the flow path size of the impeller assembly can also affect the flow rate of the delivery pump.

[0043] In view of this, an embodiment of the present application provides a delivery pump, which includes an impeller assembly and a pump casing. The impeller assembly is installed in the pump casing, and the impeller assembly rotates around a rotation center line N to deliver the fluid in the pump casing.

[0044] It can be understood that the impeller assembly rotates around the rotation center line N, and the fluid in the pump casing is discharged from the outlet of the pump casing under the pumping action generated by the rotation of the impeller assembly.

[0045] In one embodiment, the fluid pumped by the delivery pump may be water.

[0046] In one embodiment, the delivery pump may be a centrifugal pump.

[0047] In one embodiment, the centrifugal pump may be a single-stage double-suction centrifugal pump, which is also called a split case pump.

[0048] For the impeller assembly of the embodiment of this application, please refer to Figures 1 to 5The impeller assembly has a rotation centerline N and a flow channel 1 located around the rotation centerline N. The impeller assembly includes two impeller bodies 2, each of which rotates around the rotation centerline N. The two impeller bodies 2 are arranged relative to each other along the extension direction of the rotation centerline N. The two impeller bodies 2 enclose the flow channel 1. The two impeller bodies 2 change the flow area of the flow channel 1 by approaching or moving away from each other to adjust the flow rate of the flow channel 1. With such a structural form, when the two impeller bodies 2 approach each other, the width of the flow channel 1 decreases, and the flow area of the flow channel 1 decreases accordingly. Under the condition that the rotation speed of the impeller bodies 2 remains basically unchanged, the flow rate of the delivery pump can be reduced to a certain extent; when the two impeller bodies 2 move away from each other, the width of the flow channel 1 increases, and the flow area of the flow channel 1 increases accordingly. Under the condition that the rotation speed of the impeller bodies 2 remains basically unchanged, the flow rate of the delivery pump can be increased to a certain extent. By moving the two impeller bodies 2 closer to or farther from each other, the flow area of the flow channel 1 changes, thereby adjusting the flow of the delivery pump. During the flow regulation process of the delivery pump, there is no need to change the rotational speed of the impeller body 2, so there is no need to add a frequency converter to the power grid, which reduces the cost of flow regulation of the delivery pump and reduces the pollution caused to the power grid by the delivery pump during the flow regulation process.

[0049] It is understandable that if the speed of the impeller body 2 remains unchanged and the flow rate of the flow channel 1 changes, the output power of the motor driving the impeller body 2 to rotate will change accordingly, and there is no need for a frequency converter to change the output power of the motor.

[0050] It can be understood that, as the flow area of the flow channel 1 increases, the volume of the flow channel 1 increases accordingly, and as the flow area of the flow channel 1 decreases, the volume of the flow channel 1 decreases accordingly.

[0051] In one embodiment, the width of the flow channel is the extending direction of the rotation center line N.

[0052] In one embodiment, the delivery pump further includes two traction mechanisms, each traction mechanism being connected to a corresponding impeller body, and each traction mechanism driving the corresponding impeller body to move the two impeller bodies toward or away from each other. In this structural form, flow regulation is achieved by driving the impeller bodies to move by the traction mechanisms.

[0053] In one embodiment, each impeller body 2 can be integrally formed.

[0054] In one embodiment, the impeller body 2 is manufactured by casting. Processing the impeller body 2 by casting facilitates the processing and manufacturing of the impeller body 2 with a more complex shape.

[0055] In one embodiment, the impeller body 2 includes a plurality of sub-impellers arranged along the circumference of the rotation center line N.

[0056] In one embodiment, please refer to Figures 2 to 5The impeller body 2 includes blades, and the blades of the two impeller bodies 2 are partially overlapped to limit the fluid in the flow channel 1 from leaking from between the blades of the two impeller bodies 2. In this structural form, the blades of the two impeller bodies 2 are partially overlapped. When the two impeller bodies 2 move closer to or farther away from each other to adjust the flow rate of the delivery pump, the flow of the fluid in the flow channel 1 is restricted. The possibility of the fluid in the flow channel 1 being thrown out from between the two blades under the action of the centrifugal force of the blades is reduced. This can reduce the possibility of the fluid in the flow channel 1 leaking from between the blades of the two impeller bodies 2 to a certain extent, thereby improving pumping efficiency.

[0057] It is understandable that when the blades of the two impeller bodies 2 are partially overlapped, there may not be a seal between the blades of the two impeller bodies 2 , and a small amount of fluid may flow out from between the blades of the two impeller bodies 2 and leak.

[0058] In one embodiment, please refer to Figures 2 to 5 The blades of the two impeller bodies 2 are sealed and connected to limit the fluid in the flow channel 1 from leaking from between the blades of the two impeller bodies 2. With this structure, the fluid in the flow channel 1 is basically prevented from leaking from between the blades of the two impeller bodies 2 through the sealed connection of the blades of the two impeller bodies 2, thereby improving pumping efficiency.

[0059] It can be understood that when the blades of the two impeller bodies 2 are sealed, since the gap between the blades of the two impeller bodies 2 is sealed, the fluid in the flow channel 1 basically will not flow out from between the blades of the two impeller bodies 2, thereby preventing fluid leakage.

[0060] In one embodiment, please refer to Figures 2 to 5 The impeller body 2 also includes a hub 21 and a front cover plate 23. The hubs 21, blades and front cover plates 23 of the two impeller bodies 2 are arranged to form a flow channel 1. The blades of the two impeller bodies 2 are partially overlapped to prevent the fluid in the flow channel 1 from leaking between the blades of the two impeller bodies 2.

[0061] In one embodiment, please refer to Figures 2 to 5 The front cover plate 23 surrounds the hub 21 , and the front cover plate 23 of one impeller body 2 is located on the side of the corresponding blade facing away from the other impeller body 2 .

[0062] In one embodiment, the hub 21 , the blades, and the front cover plate 23 are connected to each other.

[0063] In one embodiment, the hub 21 , the blades and the front cover plate 23 are integrally formed.

[0064] In one embodiment, the hub 21 , the blades and the front cover plate 23 are welded.

[0065] In one embodiment, please refer to Figures 2 to 5At the radial end of the blades, which is closer to the hub 21, the blades are connected to the front cover plate 23 and the hub 21, respectively. At this position, the blades of the two impeller bodies 2 are not sealed to each other, but are each connected to the corresponding hub 21. On the outside of the hub 21, that is, on the side of the hub 21 facing away from the rotation centerline N, the blades are no longer connected to the hub 21. At this position, the blades are connected to the corresponding front cover plate 23, and the blades of the two impeller bodies 2 partially overlap.

[0066] In one embodiment, please refer to Figures 2 to 5 In the two impeller bodies 2 , the blades of one impeller body 2 are first blades 221 , and the blades of the other impeller body 2 are second blades 222 . The first blades 221 and the second blades 222 are partially overlapped.

[0067] In one embodiment, please refer to Figures 2 to 5 The first blade 221 is formed with a first overlapping portion 2211 , and the second blade 222 is formed with a second overlapping portion 2221 . The first overlapping portion 2211 and the second overlapping portion 2221 overlap with each other to limit the fluid in the flow channel 1 .

[0068] In one embodiment, please refer to Figures 2 to 5 The first blade 221 is further formed with a first stop boss 2212, which is located along the rotational centerline N at an end of the first overlapping portion 2211 facing away from the second blade 222. The second blade 222 is further formed with a second stop boss 2222, which is located along the rotational centerline N at an end of the second overlapping portion 2221 facing away from the first blade 221. In the radial direction of the rotational centerline N, the second overlapping portion 2221 abuts against a side of the first overlapping portion 2211 facing the first stop boss 2212, and the first overlapping portion 2211 abuts against a side of the second overlapping portion 2221 facing the second stop boss 2222, so that the first overlapping portion 2211 and the second overlapping portion 2221 overlap each other. A bent gap is formed between the first stopping platform 2212 , the second stopping platform 2222 , the first overlapping portion 2211 and the second overlapping portion 2221 , which helps prevent the fluid from flowing out and leaking from the gap between the first overlapping portion 2211 and the second overlapping portion 2221 .

[0069] In one embodiment, please refer to Figures 2 to 5 A first stopping platform 2212 is provided on at least one side of the first stacking portion 2211 along the radial direction of the rotation center line N.

[0070] In one embodiment, please refer to Figure 5The first stacking portion 2211 is provided with a second stacking portion 2221 on both sides of the first stacking portion 2211 in the radial direction of the rotation centerline N. The first stacking portion 2211 abuts against the second stacking portions 2221 on both sides in the radial direction of the rotation centerline N, so that the first stacking portion 2211 and the second stacking portion 2221 are stacked together in multiple layers. This structure, in which the first stacking portion 2211 and the second stacking portion 2221 are stacked together in multiple layers, helps prevent fluid from flowing out and leaking through the gap between the first stacking portion 2211 and the second stacking portion 2221.

[0071] In one embodiment, a first stopper 2212 is provided on both sides of the first overlapping portion 2211 along the radial direction of the rotation centerline N. A second overlapping portion 2221 is provided on both sides of the first overlapping portion 2211 along the radial direction of the rotation centerline N. The first overlapping portion 2211 abuts against the second overlapping portions 2221 on both sides along the radial direction of the rotation centerline N. With this structure, the gap formed between the first stopper 2212, the first overlapping portion 2211, and the second overlapping portion 2221 bends more frequently, which helps prevent fluid from flowing out of the gap between the first overlapping portion 2211 and the second overlapping portion 2221 and leaking.

[0072] In one embodiment, the first blade 221 and the second blade 222 may be sealed by a sealing member.

[0073] In one embodiment, the impeller assembly further includes a shaft assembly 300, and the impeller body 2 is sleeved on the shaft assembly 300. The impeller body 2 is movable along the axial direction of the shaft assembly 300. In this structural form, the impeller body 2 is supported by the shaft assembly 300, and the impeller body 2 moves on the shaft assembly 300 to adjust the flow area of the flow channel.

[0074] In one embodiment, please refer to Figure 1 , Figures 6 to 8The shaft assembly 300 further includes a mounting shaft 3 and a sleeve 4. The sleeve 4 is sleeved on the mounting shaft 3 and is capable of moving axially along the mounting shaft 3. At least one impeller body 2 is sleeved on a corresponding sleeve 4, and the sleeve 4 is used to drive the impeller body 2 to move axially relative to the mounting shaft 3. With this structural form, the mounting shaft 3 can be installed on the pump casing, and the impeller body 2 can be supported by the mounting shaft 3. The impeller is sleeved on the corresponding sleeve 4. The sleeve 4 moves on the mounting shaft 3 to drive the impeller body 2 sleeved on the sleeve 4 to move, thereby achieving the purpose of moving the two impeller bodies 2 closer to or farther away from each other, thereby adjusting the flow area of the flow channel 1 and thus adjusting the flow rate of the delivery pump. The shaft sleeve 4 drives the impeller body 2 to move axially relative to the mounting shaft 3. The impeller body 2 basically does not move relative to the shaft sleeve 4, and there is basically no friction between the impeller and the shaft sleeve 4. The two impeller bodies 2 are moved closer or farther away from each other by the movement of the shaft sleeve 4 relative to the mounting shaft 3. During the adjustment process, the friction mainly occurs between the shaft sleeve 4 and the mounting shaft 3, and the impeller has almost no wear, thereby better protecting the impeller. On the other hand, even if the shaft sleeve 4 is damaged due to wear, only the shaft sleeve 4 needs to be replaced, without replacing the entire impeller body 2, which reduces the maintenance cost of the delivery pump.

[0075] In one embodiment, please refer to Figure 1 , Figures 6 to 8 There are two shaft sleeves 4, which are arranged opposite to each other along the axial direction of the mounting shaft 3. Each impeller body 2 is sleeved on the corresponding shaft sleeve 4, and the shaft sleeve 4 is used to drive the corresponding impeller body 2 to move axially relative to the mounting shaft 3.

[0076] In one embodiment, the wear resistance of the shaft sleeve 4 is higher than that of the impeller body 2. The friction between the shaft sleeve 4 with better wear resistance and the mounting shaft 3 is conducive to reducing friction loss.

[0077] In one embodiment, the shaft sleeve 4 is used to limit the movement of the impeller body 2 relative to the shaft sleeve 4 , so that the shaft sleeve 4 drives the corresponding impeller body 2 to move axially relative to the mounting shaft 3 .

[0078] In one embodiment, the shaft sleeve 4 is manufactured by forging, which makes the material of the shaft sleeve 4 denser and more wear-resistant.

[0079] In one embodiment, when the materials are substantially the same, the wear resistance of the forged sleeve 4 is higher than that of the cast impeller body 2 .

[0080] It should be noted that wear resistance refers to the ability to resist mechanical wear. The wear resistance of the sleeve 4 is higher than that of the impeller body 2, that is, the wear resistance of the sleeve 4 is higher than that of the impeller body 2.

[0081] It can be understood that, under substantially the same conditions, the wear of the shaft sleeve 4 is less than the wear of the impeller.

[0082] In one embodiment, the shaft sleeve 4 may not be provided, the shaft assembly 300 is a mounting shaft, and the impeller body 2 is sleeved on the mounting shaft and in direct contact with the mounting shaft.

[0083] It is understood that the impeller assembly does not need to include the shaft assembly 300. In one embodiment, the hub 21 of the impeller body 2 can be supported on the pump casing, with the hub 21 being rotatably connected to the pump casing. The motor drives the hub 21 to rotate via a belt drive or gear drive. In this structural form, the hub 21 of the impeller body 2 is supported on the pump casing, eliminating the need for the shaft assembly 300 to support the impeller body 2.

[0084] In one embodiment, the mounting shaft 3 is keyed to the sleeve 4. With this structure, since the sleeve 4 is restricted from rotating relative to the mounting shaft 3, the sleeves 4 corresponding to the two impeller bodies 2 rotate synchronously with the mounting shaft 3. Since the sleeves 4 restrict the movement of the impeller bodies 2 relative to the sleeves 4, the two impeller bodies 2 rotate synchronously driven by the mounting shaft 3 and the corresponding sleeves 4, which facilitates the pumping of fluid by the impeller bodies 2 and prevents the two impeller bodies 2 from misaligning during rotation.

[0085] In one embodiment, the sleeve 4 can also rotate relative to the mounting shaft 3. The sleeve 4 is supported by the mounting shaft 3. The mounting shaft 3 is mounted on the pump casing and does not transmit power itself. The motor drives the sleeve 4 to rotate through a belt drive or gear drive, thereby driving the impeller body 2 mounted on the sleeve 4 to rotate.

[0086] In one embodiment, the mounting shaft 3 is rotatably connected to the pump housing.

[0087] In one embodiment, when the mounting shaft 3 is rotationally connected to the pump housing, the driving member can drive the mounting shaft 3 to rotate.

[0088] In one embodiment, when the mounting shaft 3 is installed on the pump casing to limit the rotation of the mounting shaft 3 relative to the pump casing, the shaft sleeve 4 rotates relative to the mounting shaft 3, and the motor drives the shaft sleeve 4 to rotate through a belt drive or a gear drive, thereby driving the impeller body 2 mounted on the shaft sleeve 4 to rotate.

[0089] In one embodiment, please refer to Figure 7 and Figure 8The shaft sleeve 4 includes a first sub-sleeve 41 and a second sub-sleeve 42. The first sub-sleeve 41 is sleeved on the mounting shaft 3 and can move axially along the mounting shaft 3 and rotate along with the mounting shaft 3. The corresponding impeller body 2 is sleeved on the first sub-sleeve 41 so that the corresponding impeller body 2 rotates along the first sub-sleeve 41. A first shoulder 411 is formed at one end of the first sub-sleeve 41. The second sub-sleeve 42 is sleeved on the mounting shaft 3 and can move axially along the mounting shaft 3. The second sub-sleeve 42 is mounted on the end of the first sub-sleeve 41 away from the first shoulder 411. The second sub-sleeve 42 is formed with a second shoulder 421. The area between the first shoulder 411 and the second shoulder 421 is used to at least partially accommodate the corresponding impeller body 2 to limit the axial movement of the corresponding impeller body 2 along the mounting shaft 3. With this structure, when the impeller body 2 needs to be installed, the impeller body 2 can be sleeved on the first sub-shaft sleeve 41, and then the second sub-shaft sleeve 42 can be connected to the first sub-shaft sleeve 41. Because the first shoulder 411 and the second shoulder 421 limit the axial movement of the impeller body 2 along the installation shaft 3, the impeller body 2 can rotate with the first sub-shaft sleeve 41. Therefore, there is almost no friction between the impeller body 2 and the first sub-shaft sleeve 41, and there is almost no friction between the impeller body 2 and the second sub-shaft sleeve 42, which can effectively protect the impeller body 2 and reduce wear on the impeller body 2. Through the connection between the first sub-shaft sleeve 41 and the second sub-shaft sleeve 42, and the mutual cooperation between the first shoulder 411 and the second shoulder 421, the impeller body 2 can be more conveniently installed on the shaft sleeve 4, and the purpose of limiting the movement of the impeller body 2 relative to the shaft sleeve 4 is achieved.

[0090] In one embodiment, please refer to Figure 9 and Figure 10 The impeller body 2 abuts against the first shoulder 411 and the second shoulder 421 respectively.

[0091] In one embodiment, please refer to Figures 7 to 10 The area between the first shoulder 411 and the second shoulder 421 is used to at least partially accommodate the corresponding hub 21 to limit the axial movement of the corresponding hub 21 along the mounting shaft 3, thereby limiting the axial movement of the impeller body 2 along the mounting shaft 3.

[0092] In one embodiment, please refer to Figure 9 and Figure 10 The wheel hub 21 abuts against the first shoulder 411 and the second shoulder 421 respectively.

[0093] In one embodiment, please refer to Figure 9 and Figure 10 A third shoulder 211 is formed on the inner side of the hub 21 and abuts against the second shoulder 421 .

[0094] In one embodiment, the first sub-shaft sleeve 41 and the second sub-shaft sleeve 42 are detachably connected. This structure allows the impeller body 2 to be easily installed on the shaft sleeve 4 and also to be easily removed from the shaft sleeve 4, facilitating maintenance of the impeller body 2 and the shaft sleeve 4.

[0095] In one embodiment, the detachable connection between the first sub-shaft sleeve 41 and the second sub-shaft sleeve 42 may be a threaded connection or a clamping connection.

[0096] In one embodiment, the first sub-shaft sleeve 41 and the second sub-shaft sleeve 42 are welded.

[0097] In one embodiment, the impeller is sleeved on the first sub-shaft sleeve 41 , and the impeller and the first sub-shaft sleeve 41 are welded.

[0098] In one embodiment, when the impeller is welded to the first sub-shaft sleeve 41 , the second sub-shaft sleeve 42 may not be provided.

[0099] In one embodiment, the first sub-shaft sleeve 41 is key-connected to the impeller body 2 so that the impeller body 2 rotates along with the first sub-shaft sleeve 41 .

[0100] In one embodiment, please refer to Figure 1 , Figures 6 to 10 The impeller assembly also includes a flat key 5.

[0101] In one embodiment, please refer to Figure 1 , Figures 6 to 10 An internal spline 412 is formed on the inner side of each first sub-shaft sleeve 41, and the internal spline 412 of each first sub-shaft sleeve 41 meshes with the corresponding external spline 31 on the mounting shaft 3. With this structural form, the meshing of the internal spline 412 and the external spline 31 forms a spline connection between the first sub-shaft sleeve 41 and the mounting shaft 3. Torque needs to be transmitted between the first sub-shaft sleeve 41 and the mounting shaft 3, and the first sub-shaft sleeve 41 needs to move axially along the mounting shaft 3. The first sub-shaft sleeve 41 and the mounting shaft 3 are connected by a spline, and the contact area between the first sub-shaft sleeve 41 and the mounting shaft 3 for transmitting torque is large, and the pressure caused by the torque on the contact surface is small, which helps to reduce wear caused by the relative movement between the first sub-shaft sleeve 41 and the mounting shaft 3.

[0102] In one embodiment, the outer side of the first sub-shaft sleeve 41 is fixedly connected to the impeller body 2. By the outer side of the first sub-shaft sleeve 41 being fixedly connected to the impeller body 2, the impeller body 2 rotates along with the first sub-shaft sleeve 41.

[0103] In one embodiment, the outer side of the first sub-sleeve 41 is fixedly connected to the impeller body 2 via a flat key connection or a spline connection.

[0104] In one embodiment, the outer side of the first sub-sleeve 41 is fixedly connected to the impeller body 2 by interference fit.

[0105] In one embodiment, the outer side of the first sub-sleeve 41 is fixedly connected to the impeller body 2 by brazing.

[0106] By using different key connection types at different positions of the first sub-shaft sleeve 41 , the wear of the first sub-shaft sleeve 41 is reduced and the connection between the first sub-shaft sleeve 41 and the impeller body 2 is simplified.

[0107] In one embodiment, the first sub-sleeve 41 is connected to the mounting shaft 3 via a flat key.

[0108] In one embodiment, the first sub-shaft sleeve 41 is connected to the impeller body 2 via a spline.

[0109] In one embodiment, please refer to Figure 6 The mounting shaft 3 includes a second shaft segment 33 and two first shaft segments 32. Each first shaft segment 32 corresponds to a first sub-shaft sleeve 41 and a second sub-shaft sleeve 42, respectively. The first sub-shaft sleeve 41 and the second sub-shaft sleeve 42 are both movable along the axial direction of the corresponding first shaft segment 32. The second shaft segment 33 is connected between the two first shaft segments 32. The two first sub-shaft sleeves 41 are both sleeved on the second shaft segment 33. The diameter of the second shaft segment 33 is larger than that of the first shaft segment 32. The two ends of the second shaft segment 33 can respectively abut the ends of the corresponding internal splines 412 to position the corresponding first sub-shaft sleeve 41. With such a structural form, since the diameters of the two first shaft segments 32 at both ends of the second shaft segment 33 are smaller than the diameter of the second shaft segment 33, the internal spline 412 of the first sub-shaft sleeve 41 sleeved on the first shaft segment 32 can abut against the corresponding end of the second shaft segment 33 to achieve the positioning of the first sub-shaft sleeve 41, and indirectly achieve the positioning of the impeller body 2. To a certain extent, it can prevent the two impeller bodies 2 supported on the mounting shaft 3 from being too biased toward one end of the mounting shaft 3 during the flow regulation process, which is conducive to better pumping of the fluid and makes the overall load of the delivery pump more uniform.

[0110] It should be noted that the second shaft section 33 is only in contact with the two first sub-shaft sleeves 41 for positioning when the two first sub-shaft sleeves 41 are closest to each other. After the positioning is completed, the two first sub-shaft sleeves 41 can be kept moving synchronously in directions away from each other to prevent the two impeller bodies 2 mounted on the corresponding first sub-shaft sleeves 41 from being too biased toward one end of the mounting shaft 3.

[0111] In one embodiment, the two first shaft segments 32 and the second shaft segment 33 can be integrally formed.

[0112] In one embodiment, the first sub-sleeve 41 can be sleeved on the first shaft segment 32 but not on the second shaft segment 33 . The end of the first sub-sleeve 41 abuts against the second shaft segment 33 to achieve positioning of the first sub-sleeve 41 by the second shaft segment 33 .

[0113] It is understandable that the fluid in the flow channel 1 may penetrate from between the two impeller bodies 2 and the two first sub-shaft sleeves 41, and the fluid that penetrates between the two first sub-shaft sleeves 41 may flow to the second shaft segment 33 and leak outward through the two first shaft segments 32. In one embodiment, please refer to Figure 9 and Figure 10 The second shaft segment 33 and the two first sub-shaft sleeves 41 are sealed together to prevent the fluid in the flow channel 1 from leaking from between the second shaft segment 33 and the first sub-shaft sleeves 41. With this structure, the two first sub-shaft sleeves 41 are sealed together to separate the gap between the two first sub-shaft sleeves 41 and the space where the two first shaft segments 32 are located. This prevents the fluid in the flow channel 1 from seeping between the two first sub-shaft sleeves 41 and leaking into the space where the two first shaft segments 32 are located through the gap between the first sub-shaft sleeves 41 and the second shaft segment 33, thereby improving pumping efficiency to a certain extent.

[0114] In one embodiment, the first sub-sleeve 41 and the second shaft segment 33 are sealed by corresponding sealing members.

[0115] In one embodiment, please refer to Figure 6 , an external spline 31 is formed on the mounting shaft 3.

[0116] In one embodiment, please refer to Figure 6 , external splines 31 are formed on the first shaft segments 32. Each first shaft segment 32 is formed with external splines 31.

[0117] In one embodiment, please refer to Figure 1 , Figures 7 to 10 The first shaft shoulder 411 is located at one end of the corresponding impeller body 2 facing the other impeller body 2, and the second shaft shoulder 421 is located at one end of the corresponding impeller body 2 facing away from the other impeller body 2; along the axial direction of the mounting shaft 3, the two first sub-shaft sleeves 41 are located between the two second sub-shaft sleeves 42. With this structural form, the two first sub-shaft sleeves 41 are located between the two second sub-shaft sleeves 42, so that the second sub-shaft sleeve 42 is located at the end of the two first sub-shaft sleeves 41 away from each other. Since the second shaft shoulder 421 is located at the end of the corresponding impeller body 2 away from the other impeller body 2, the second sub-shaft sleeve 42 is located at the end of the two first sub-shaft sleeves 41 away from each other, the position of the second sub-shaft sleeve 42 will not be blocked by the impeller body 2, so that the operator can more conveniently disassemble and assemble the second sub-shaft sleeve 42. The operator only needs to tighten or loosen the thread of the second sub-shaft sleeve 42 to achieve disassembly and assembly between the first sub-shaft sleeve 41 and the second sub-shaft sleeve 42. The impeller rotates with the first sub-shaft sleeve 41, and the torque is mainly transmitted through the first sub-shaft sleeve 41. The second sub-shaft sleeve 42 may not transmit the impeller torque. Therefore, when the second sub-shaft sleeve 42 is tightened or loosened, the rotation of the second sub-shaft sleeve 42 may not drive the impeller body 2 to rotate, making the disassembly and assembly of the second sub-shaft sleeve 42 relatively simple.

[0118] In one embodiment, the first shoulder 411 is located at an end of the corresponding impeller body 2 facing away from the other impeller body 2, and the second shoulder 421 is located at an end of the corresponding impeller body 2 facing the other impeller body 2. Along the axial direction of the mounting shaft 3, the two second sub-shaft sleeves 42 are located between the two first sub-shaft sleeves 41.

[0119] It can be understood that the torque exerted by the impeller on the first sub-shaft sleeve 41 through the flat key 5 is the first torque, and the torque exerted by the mounting shaft 3 on the first sub-shaft sleeve 41 through the internal spline 412 and the external spline 31 is the second torque. The directions of the first torque and the second torque are opposite. The first torque and the second torque both act on the first sub-shaft sleeve 41, causing the first sub-shaft sleeve 41 to deform to a certain extent. In one embodiment, please refer to Figure 1 , Figures 6 to 10 Along the axial direction of the mounting shaft 3, the flat key 5, the internal spline 412, and the external spline 31 are all located between the first shoulder 411 and the second shoulder 421. With this structural form, since the impeller body 2 is located between the first shoulder 411 and the second shoulder 421, and the flat key 5 is located between the first shoulder 411 and the second shoulder 421, it is convenient for the first sub-sleeve 41 to be connected to the impeller body 2 via the flat key 5. The flat key 5 used to connect the first sub-sleeve 41 and the impeller body 2, as well as the internal spline 412 and the internal spline 31 that mesh with each other, are all located between the first shoulder 411 and the second shoulder 421. Along the axial direction of the mounting shaft 3, the location where the internal spline 412 and the external spline 31 mesh with each other is closer to the location where the first sub-sleeve 41 and the impeller body 2 are connected via the flat key 5, and the distance between the first torque and the second torque is relatively close. Maintaining a constant torsional load, the first sub-shaft sleeve 41 experiences approximately the same strain under torsion. Due to the close distance between the first and second torques, the torsion angle of the first sub-shaft sleeve 41 under torsion is relatively small. Therefore, the arrangement of the flat key 5, internal spline, and external spline 31 reduces deformation of the first sub-shaft sleeve 41 to a certain extent.

[0120] It should be noted that the shear strain formed by the first torque and the second torque acting on the first sub-sleeve 41 is inversely proportional to the distance between the first torque and the second torque, the shear strain formed by the first torque and the second torque acting on the first sub-sleeve 41 is proportional to the torsion angle formed by the first sub-sleeve 41 under the action of torsion, the shear strain is proportional to the shear stress, and the shear stress is proportional to the torque.

[0121] For example, the first torque acts on the first sub-shaft sleeve 41 at a position approximately where the first sub-shaft sleeve 41 is connected to the impeller body 2 via the flat key 5, and the second torque acts on the first sub-shaft sleeve 41 at a position approximately where the internal spline 412 and the external spline 31 engage. The first torque is A, and the second torque is B. Maintaining the magnitudes of the first and second torques, the shear strains formed on the first sub-shaft sleeve 41 under the action of the first and second torques remain substantially unchanged. The closer the position where the first torque acts on the first sub-shaft sleeve 41 is to the position where the second torque acts on the first sub-shaft sleeve 41, the smaller the torsion angle formed by the torsion of the first sub-shaft sleeve 41. The farther the position where the first torque acts on the first sub-shaft sleeve 41 is from the position where the second torque acts on the first sub-shaft sleeve 41, the larger the torsion angle formed by the torsion of the first sub-shaft sleeve 41.

[0122] In one embodiment, please refer to Figure 8 The first sub-sleeve 41 is formed with a sealing section 413, which is located between the internal splines 412 of the two first sub-sleeves 41. The sealing section 413 is sleeved on the second shaft section 33. The sealing section 413 is sealed and connected to the second shaft section 33. The second shaft section 33 is located in the sealing section 413 and abuts against the internal splines 412 to position the first sub-sleeve 41.

[0123] In one embodiment, the first shoulder 411 is formed at the sealing section 413 .

[0124] In one embodiment, the first sub-sleeve 41 may not be provided with the internal spline 412 , and the second sub-sleeve 42 is formed with the internal spline 412 engaged with the external spline 31 on the mounting shaft 3 .

[0125] In one embodiment, the internal spline 412 on the second sub-sleeve 42 may be located on a side of the second shoulder 421 facing away from the first sub-sleeve 41 .

[0126] In one embodiment, please refer to Figures 1 to 3 , Figures 9 to 11 The impeller assembly also includes a sealing sleeve 6, which is located at the end where the two impeller bodies 2 are close to each other. The shaft sleeve 4 and the corresponding impeller body 2 are sealed by the sealing sleeve 6 to prevent the fluid in the flow channel 1 from leaking from between the two impeller bodies 2. The sealing sleeve 6 is arranged across the shaft sleeve 4 to prevent the fluid in the flow channel 1 from leaking from between the two shaft sleeves 4. This structural form, through the sealing sleeve 6, seals the impeller body 2 and the shaft sleeve 4, preventing the fluid in the flow channel 1 from leaking, which helps improve the pumping efficiency of the delivery pump.

[0127] In one embodiment, please refer to Figures 1 to 3 , Figures 9 to 11The ends of the two impeller bodies 2 that are close to each other are surrounded by a sealing groove 7. The sealing sleeve 6 is installed in the sealing groove 7. The sealing groove 7 has two annular grooves 71 arranged opposite to each other along the axial direction of the installation shaft 3. The sealing sleeve 6 is formed with two mounting protrusions 61 arranged opposite to each other along the axial direction of the installation shaft 3. Each mounting protrusion 61 is located in a corresponding annular groove 71. Each mounting protrusion 61 is respectively in sealing contact with the corresponding shaft sleeve 4 and impeller body 2, thereby constraining the mounting protrusion 61 within the annular groove 71. In this structural form, the annular grooves 71 and the mounting protrusions 61 cooperate to cause the mounting protrusions 61 to respectively contact the shaft sleeve 4 and the impeller body 2. On the one hand, the mounting protrusion 61 of the sealing sleeve 6 is clamped in the annular groove 71, achieving a relatively secure installation of the sealing sleeve 6. On the other hand, it also forms a good seal between the sealing sleeve 6 and the shaft sleeve 4, and between the sealing sleeve 6 and the impeller body 2, thereby preventing fluid leakage in the flow channel 1.

[0128] In one embodiment, a sealing groove 7 is formed at one end of the two hubs 21 that are close to each other.

[0129] In one embodiment, please refer to Figure 1 and Figure 7 The impeller assembly further includes a connecting mechanism 8 connected to the shaft sleeve 4 , and the connecting mechanism 8 can rotate around the shaft sleeve 4 .

[0130] In one embodiment, the traction mechanism is connected to the connecting mechanism 8 to drive the sleeve 4 to move axially along the mounting shaft 3. The traction mechanism is indirectly connected to the impeller body 2 through the connecting mechanism 8 and the sleeve 4.

[0131] It is understood that the traction mechanism drives the sleeve 4 to move via the connection mechanism 8, thereby driving the impeller body 2 mounted on the sleeve 4 to move, so that the impeller bodies 2 move closer to or farther from each other. Because the connection mechanism 8 can rotate about the sleeve 4, the connection mechanism 8 does not rotate with the sleeve 4 during the rotation of the sleeve 4. The traction mechanism drives the connection mechanism 8 and the sleeve 4 to move axially along the mounting shaft 3, and the traction mechanism does not rotate with the sleeve 4. This can, to a certain extent, prevent the traction mechanism from causing pipe or line entanglement.

[0132] In one embodiment, the traction mechanism may be an oil cylinder, an air cylinder or an electric push rod.

[0133] In one embodiment, the traction mechanism may also be directly connected to the impeller body 2 .

[0134] In one embodiment, the connection mechanism 8 may be a bearing, the inner ring of the bearing is sleeved on the shaft sleeve 4 , and the outer ring of the bearing rotates relative to the shaft sleeve 4 .

[0135] In one embodiment, the inner ring of the bearing can be welded to the sleeve 4 .

[0136] In one embodiment, the inner ring of the bearing may abut against the stopper 9 to limit the axial movement of the bearing relative to the sleeve 4 along the mounting shaft 3 .

[0137] In one embodiment, the connecting mechanism 8 can be omitted, and the traction mechanism can be a structure that does not require external pipes or wiring. For example, the traction mechanism can be an electric push rod with its own battery. One end of the electric push rod is connected to the mounting shaft 3, and the other end is connected to the sleeve 4. When the sleeve 4 rotates with the mounting shaft 3, the electric push rod can also rotate with the mounting shaft 3. Because the electric push rod has its own battery, no external wires or pipes are required. When the electric push rod rotates with the mounting shaft 3, there is basically no problem of pipe or wire entanglement. The electric push rod pushes and pulls the sleeve 4, which can achieve axial movement of the sleeve 4 on the mounting shaft 3.

[0138] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0139] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An impeller assembly, characterized in that: The impeller assembly comprises two impeller bodies, each of which rotates about the rotation centerline. The two impeller bodies are arranged opposite to each other along the extension direction of the rotation centerline. The two impeller bodies enclose the flow channel. The two impeller bodies change the flow area of the flow channel by moving closer to or farther from each other to adjust the flow rate of the flow channel. The impeller assembly further includes a shaft assembly, the impeller body is sleeved on the shaft assembly, and the impeller body is capable of moving along the axial direction of the shaft assembly; The shaft assembly comprises: Install the shaft; and a shaft sleeve, sleeved on the mounting shaft, the shaft sleeve being capable of moving axially along the mounting shaft, and the shaft sleeve being used to drive the impeller body to move axially relative to the mounting shaft; There are two shaft sleeves, and the two impeller bodies are respectively sleeved on the two shaft sleeves. The two shaft sleeves are arranged opposite to each other along the axial direction of the mounting shaft. The impeller assembly further includes a sealing sleeve, which is located at one end of the two impeller bodies close to each other. The shaft sleeves and the corresponding impeller bodies are sealed by the sealing sleeves to prevent the fluid in the flow channel from leaking from between the two impeller bodies. The sealing sleeve is spanned between the two shaft sleeves to prevent the fluid in the flow channel from leaking from between the two shaft sleeves. One end of the two impeller bodies close to each other is surrounded by a sealing groove, and the sealing sleeve is installed in the sealing groove. The sealing groove has two annular grooves arranged opposite to each other along the axial direction of the installation shaft. The sealing sleeve is formed with two mounting protrusions arranged opposite to each other along the axial direction of the installation shaft, each mounting protrusion is located in the corresponding annular groove, and each mounting protrusion is respectively in sealing contact with the corresponding shaft sleeve and impeller body to constrain the mounting protrusion in the annular groove; The impeller body includes blades, and the blades of the two impeller bodies are partially overlapped to restrict leakage of fluid in the flow channel from between the blades of the two impeller bodies.

2. The impeller assembly according to claim 1, characterized in that: The blades of the two impeller bodies are sealed and connected to limit leakage of the fluid in the flow channel from between the blades of the two impeller bodies.

3. The impeller assembly according to claim 1, characterized in that: The sleeve comprises: a first sub-shaft sleeve, sleeved on the mounting shaft, the first sub-shaft sleeve being movable along the axial direction of the mounting shaft and rotating along with the mounting shaft, the corresponding impeller body being sleeved on the first sub-shaft sleeve so that the corresponding impeller body rotates along with the first sub-shaft sleeve, and a first shaft shoulder being formed at one end of the first sub-shaft sleeve; and The second sub-sleeve is sleeved on the mounting shaft, and the second sub-sleeve is capable of moving axially along the mounting shaft. The second sub-sleeve is installed on the end of the first sub-sleeve away from the first shoulder. The second sub-sleeve is formed with a second shoulder. The area between the first shoulder and the second shoulder is used to at least partially accommodate the corresponding impeller body to limit the axial movement of the corresponding impeller body along the mounting shaft.

4. The impeller assembly according to claim 3, characterized in that: An internal spline is formed on the inner side of each first sub-shaft sleeve, an external spline is formed on the mounting shaft that engages with the internal spline, and an outer side of the first sub-shaft sleeve is fixedly connected to the impeller body.

5. The impeller assembly according to claim 4, characterized in that: The mounting shaft comprises: Two first shaft segments, each of which corresponds to the first sub-shaft sleeve and the second sub-shaft sleeve, and the first sub-shaft sleeve and the second sub-shaft sleeve are both capable of moving along the axial direction of the corresponding first shaft segment; and The second shaft segment is connected between the two first shaft segments, and the two first sub-shaft sleeves are both sleeved on the second shaft segment. The diameter of the second shaft segment is larger than the diameter of the first shaft segment, and the two ends of the second shaft segment can respectively abut against the corresponding end portions of the internal spline to position the corresponding first sub-shaft sleeve.

6. The impeller assembly according to claim 5, characterized in that: The second shaft segment is sealedly connected to the two first sub-shaft sleeves to prevent the fluid in the flow channel from leaking from between the second shaft segment and the first sub-shaft sleeves.

7. The impeller assembly according to claim 1, characterized in that: The mounting shaft is key-connected with the shaft sleeve.

8. The impeller assembly according to claim 1, characterized in that: The impeller assembly further includes a connecting mechanism connected to the shaft sleeve, and the connecting mechanism is capable of rotating around the shaft sleeve.

9. A delivery pump, characterized in that: include: The impeller assembly according to any one of claims 1 to 8; as well as The impeller assembly is mounted on the pump casing, and the impeller assembly rotates around a rotation center line to transport the fluid in the pump casing.

10. The delivery pump according to claim 9, characterized in that The delivery pump further includes two traction mechanisms, each of which is connected to a corresponding impeller body, and each of which drives the corresponding impeller body to move so that the two impeller bodies move closer to or farther away from each other.

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