A delivery pump

Abstract

The embodiment of the present application provides a kind of conveying pump, belongs to material conveying technical field, pump shell has liquid inlet and liquid outlet.Pivot is arranged in pump shell to rotate relative to pump shell, the number of pivot is multiple, at least one pivot is first pivot, at least one pivot is second pivot.Impeller is located in pump shell, each stage impeller and pump shell are enclosed into isolated liquid inlet chamber and liquid outlet chamber, the first liquid inlet chamber corresponding stage impeller of communication with liquid inlet is first stage impeller of being set in first pivot, the front stage impeller of adjacent two stages of impeller is connected with the liquid outlet chamber and the rear stage impeller corresponding liquid inlet chamber, in all impellers except first stage impeller, at least one stage of impeller of other impellers is set in second pivot.Drive assembly is used to drive first pivot and second pivot to rotate at least respectively, to make the rotational speed of second pivot greater than the rotational speed of first pivot.The conveying pump of the embodiment of the present application can reduce the floor area of conveying pump and alleviate the cavitation of first stage impeller.

Description

Technical Field

[0001] The present application relates to the technical field of material conveying, and in particular to a conveying pump. Background Art

[0002] Transfer pumps are primarily used to pump liquid media. They include an impeller, whose rotation delivers the pumped media. The impeller of a transfer pump should minimize cavitation, and while still meeting power requirements, the pump's footprint should be minimized. Prior art solutions have struggled to address both the pump's footprint and the cavitation issues of the first-stage impeller. Summary of the Invention

[0003] In view of this, an embodiment of the present application hopes to provide a cleaning device to reduce the footprint of the delivery pump and alleviate cavitation of the first-stage impeller.

[0004] To achieve the above-mentioned objectives, the first aspect of the embodiments of the present application provides a delivery pump, comprising:

[0005] a pump housing having a liquid inlet for receiving a pumping medium and a liquid outlet for discharging the pumping medium;

[0006] a rotating shaft, passing through the pump housing, the rotating shaft being rotatable relative to the pump housing, the rotating shaft being plural in number, at least one rotating shaft being a first rotating shaft, and at least one rotating shaft being a second rotating shaft;

[0007] An impeller is located in the pump casing, wherein each stage of the impeller and the pump casing are surrounded by a liquid inlet cavity and a liquid outlet cavity that are isolated from each other, the liquid inlet cavity being connected to the liquid inlet being the first liquid inlet cavity, the impeller of the stage corresponding to the first liquid inlet cavity being the first-stage impeller, the first-stage impeller being sleeved on the first rotating shaft to rotate along with the first rotating shaft, the liquid outlet cavity corresponding to the preceding-stage impeller of two adjacent stages being connected to the liquid inlet cavity corresponding to the succeeding-stage impeller of all the impellers except the first-stage impeller, the impeller of at least one stage being sleeved on the second rotating shaft to rotate along with the second rotating shaft;

[0008] The driving assembly is used to at least drive the first rotating shaft and the second rotating shaft to rotate respectively, so that the rotation speed of the second rotating shaft is greater than the rotation speed of the first rotating shaft.

[0009] In one embodiment, the first rotating shaft and the second rotating shaft are arranged at intervals.

[0010] In one embodiment, the pump housing is formed with a first positioning portion and a second positioning portion arranged at intervals along the axial direction of the rotating shaft, and the delivery pump also includes a positioning member, each rotating shaft is correspondingly provided with the positioning member, the positioning member is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft, and the positioning member abuts between the corresponding first positioning portion and the corresponding second positioning portion along the axial direction of the corresponding rotating shaft.

[0011] In one embodiment, the pump housing comprises:

[0012] A main housing, wherein the impeller is located in the main housing, the main housing and each stage of the impeller are respectively arranged to enclose the liquid inlet cavity and the liquid outlet cavity corresponding to each other, the rotating shaft is passed through the main housing, the rotating shaft can rotate relative to the main housing, and the first positioning portion is formed on the main housing;

[0013] The end cover is located in the main shell, the end cover is detachably connected to the main shell, the second positioning portion is formed on the end cover, and each of the rotating shafts is correspondingly provided with the end cover.

[0014] In one embodiment, the end cover is located at one end of the corresponding positioning member along the axial direction of the corresponding rotating shaft facing the corresponding impeller.

[0015] In one embodiment, the main housing includes:

[0016] a housing, wherein the impeller is located in the housing, the rotating shaft passes through the housing, and the rotating shaft is rotatable relative to the housing;

[0017] A positioning sleeve is located in the shell, the first positioning portion is formed on the positioning sleeve, the positioning sleeve is detachably connected to the shell, the shell, the impeller of the corresponding stage and the corresponding positioning sleeve are arranged to form one of the corresponding liquid inlet cavity and the liquid outlet cavity, the end cover is located in the shell, and the end cover is detachably connected to the positioning sleeve.

[0018] In one embodiment, the delivery pump further includes a partition plate, which is disposed between the first rotating shaft and the second rotating shaft, and the partition plate is connected to the positioning sleeve to separate the first rotating shaft and the second rotating shaft on opposite sides corresponding to the partition plate;

[0019] The partition is sealed with the positioning sleeve, and / or the positioning sleeve is sealed with the housing.

[0020] In one embodiment, the delivery pump further includes a partition, which is disposed between the first rotating shaft and the second rotating shaft, and the partition is connected to the pump housing to separate the first rotating shaft and the second rotating shaft on opposite sides corresponding to the partition.

[0021] In one embodiment, the partition plate is sealed from the pump housing.

[0022] In one embodiment, the liquid outlet cavity corresponding to the first-stage impeller is a first liquid outlet cavity, the liquid inlet cavity connected to the first liquid outlet cavity is a second liquid inlet cavity, the impeller corresponding to the second liquid inlet cavity is a secondary impeller, the liquid outlet cavity corresponding to the secondary impeller is the second liquid outlet cavity, and the secondary impeller is sleeved on the second rotating shaft to rotate along with the second rotating shaft;

[0023] The first liquid outlet cavity and the second liquid outlet cavity are both located between the first liquid inlet cavity and the second liquid inlet cavity along the axial direction of the rotating shaft; or, the first liquid inlet cavity and the second liquid inlet cavity are both located between the first liquid outlet cavity and the second liquid outlet cavity along the rotating axis of the rotating shaft.

[0024] In one embodiment, the first rotating shaft and the second rotating shaft are both partially located outside the pump housing so as to be drivingly connected to the drive assembly respectively.

[0025] In one embodiment, the drive assembly includes a plurality of drivers, each of which is connected to the corresponding rotating shaft to drive the corresponding rotating shaft to rotate; and / or, the drive assembly includes a transmission device and a driver, each of the rotating shafts is respectively installed on the transmission device, and the driver drives the transmission device to rotate so that the transmission device drives each rotating shaft to rotate respectively.

[0026] In the delivery pump of the embodiment of the present application, since the liquid outlet chamber corresponding to the impeller of the preceding stage is connected to the liquid inlet chamber corresponding to the impeller of the following stage in two adjacent stages, the liquid inlet chamber and liquid outlet chamber corresponding to each stage of the impeller are connected in series, and the head of the medium pumped by the impellers in the pump casing increases step by step. The first-stage impeller is mounted on the first rotating shaft, and among all the impellers other than the first-stage impeller, at least one of the impellers of the other stage is mounted on the second rotating shaft. The speeds of the first rotating shaft and the second rotating shaft can be different, and the rotational speeds of the corresponding first-stage impeller mounted on the first rotating shaft and the impeller mounted on the second rotating shaft can also be different. The drive assembly drives at least the first rotating shaft and the second rotating shaft to rotate respectively, so that the rotational speed of the second rotating shaft is greater than the rotational speed of the first rotating shaft, and the rotational speed of the impeller mounted on the second rotating shaft is greater than the rotational speed of the first-stage impeller. Since the rotational speed of the first-stage impeller is lower, the first-stage impeller is less affected by cavitation, and the cavitation of the first-stage impeller is alleviated, which can reduce the possibility of damage to the first-stage impeller due to cavitation. Because the impeller mounted on the second rotating shaft rotates at a higher speed, the lift of the impeller of the corresponding stage is increased. While maintaining the same total output lift of the delivery pump, the number of impeller stages of the delivery pump can be reduced, thereby reducing the length of the rotating shaft and the volume of the delivery pump, and correspondingly reducing the footprint of the delivery pump. Therefore, the delivery pump of the embodiment of the present application can reduce the footprint of the delivery pump and alleviate cavitation in the first-stage impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a delivery pump according to an embodiment of the present application. The diagram is used to illustrate the cross-sectional position of the delivery pump. The delivery pump in the diagram does not represent a specific embodiment.

[0028] Figure 2 for Figure 1 A cross-sectional view at position AA, in which no partition is provided between the first rotating shaft and the second rotating shaft;

[0029] Figure 3 for Figure 2 Magnified view at position B in the middle;

[0030] Figure 4 for Figure 1 A cross-sectional view at position AA, showing a partition disposed between the first rotating shaft and the second rotating shaft;

[0031] Figure 5 for Figure 4 Magnified view at position C in the middle;

[0032] Figure 6 This is a schematic structural diagram of a delivery pump according to an embodiment of the present application, in which the first rotating shaft and the second rotating shaft are respectively driven to rotate by a transmission device;

[0033] Figure 7 for Figure 6 Magnified view at position D in the middle.

[0034] Explanation of the accompanying drawings: 1. Pump casing; 11. Liquid inlet; 12. Liquid outlet; 13. First positioning portion; 14. Second positioning portion; 15. Main casing; 151. Shell; 1511. Sub-casing; 152. Positioning sleeve; 16. End cover; 21. First rotating shaft; 22. Second rotating shaft; 31. Primary impeller; 32. Secondary impeller; 41. First liquid inlet chamber; 42. Second liquid inlet chamber; 51. First liquid outlet chamber; 52. Second liquid outlet chamber; 62. Transmission device; 621. Transmission shaft; 622. Pulley assembly; 7. Positioning member; 8. Partition; 901. First locking member; 902. First shaft sleeve; 903. Second shaft sleeve; 904. Second locking member. DETAILED DESCRIPTION

[0035] It should be noted that, unless there is a conflict, the embodiments in this application and the technical features in the embodiments 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.

[0036] In the description of the embodiments of the present application, "upper", "lower", "top", "bottom", orientation or position relationship is based on the attached Figure 1Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In the related art, for a multi-stage delivery pump, each impeller in each stage is mounted on the same rotating shaft. The impellers are driven by the same rotating shaft, and the speed of each impeller increases or decreases synchronously. This synchronous increase in the speed of each impeller increases the lift of each stage. While maintaining the same total output lift, the number of stages in the delivery pump can be reduced, meaning the number of impellers is reduced. This reduction in the number of impeller stages reduces the length of the delivery pump's rotating shaft and the volume of the delivery pump, thereby reducing the delivery pump's footprint. The first inlet chamber, connected to the liquid inlet of the delivery pump's pump casing, is the first inlet chamber. The impeller corresponding to the first inlet chamber is the first-stage impeller. However, since the impellers in each stage of the delivery pump are mounted on the same shaft, when the speed of each impeller increases synchronously, the speed of the first-stage impeller also increases accordingly. Excessively high speeds in the first-stage impeller can cause cavitation and damage to the first-stage impeller. Therefore, it is difficult to balance the footprint of the delivery pump with the cavitation issues of the first-stage impeller.

[0038] In view of this, the present application embodiment provides a delivery pump, please refer to Figures 1 to 6 The delivery pump includes a pump housing 1, a rotating shaft, an impeller, and a drive assembly. The pump housing 1 has a liquid inlet 11 for receiving the pumped medium and a liquid outlet 12 for discharging the pumped medium. The rotating shaft is disposed through the pump housing 1 and is rotatable relative to the pump housing 1. There are multiple rotating shafts, at least one of which is a first rotating shaft 21 and at least one of which is a second rotating shaft 22. The impellers are located within the pump casing 1. Each stage of the impellers and the pump casing 1 encloses a mutually isolated liquid inlet and outlet cavity. The liquid inlet cavity connected to the liquid inlet 11 is the first liquid inlet cavity 41. The impeller corresponding to the first liquid inlet cavity 41 is the first-stage impeller 31. The first-stage impeller 31 is sleeved on the first rotating shaft 21 to rotate with the first rotating shaft 21. In the two adjacent impeller stages, the liquid outlet cavity corresponding to the previous stage impeller is connected to the liquid inlet cavity corresponding to the next stage impeller. Among all the impellers except the first-stage impeller 31, at least one stage of the impeller is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The drive assembly is used to drive at least the first rotating shaft 21 and the second rotating shaft 22 to rotate, so that the speed of the second rotating shaft 22 is greater than the speed of the first rotating shaft 21.

[0039] It should be noted that the delivery pump of the present application is a multi-stage pump, the number of rotating shafts is at least two, and the number of impeller stages is at least two.

[0040] The total lift of the delivery pump is the lift of the medium discharged from the liquid outlet 12 of the pump housing 1 .

[0041] The number of the rotating shafts can be two, three, four or five.

[0042] The number of the rotating shafts can be two, three, four or five.

[0043] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two. Figures 1 to 6 For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0044] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0045] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0046] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0047] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0048] For example, the medium can be liquid.

[0049] For example, the medium can be water.

[0050] For example, the delivery pump can be centrifugal pump.

[0051] For example, the centrifugal pump can be split case pump.

[0052] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two. Figure 1 For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0053] For example, the number of the rotating shafts is two and the number of the stages of the impellers is two.

[0054] It is to be noted that the liquid inlet cavity and the liquid outlet cavity corresponding to each stage of the impeller are isolated from each other, which does not mean that the liquid inlet cavity and the liquid outlet cavity are completely sealed, but means that the liquid inlet cavity and the liquid outlet cavity are sealed at positions other than the pumping channel of the corresponding stage of the impeller, i.e. the medium in the liquid inlet cavity basically enters the corresponding liquid outlet cavity through the pumping channel of the corresponding stage of the impeller, and the positions other than the pumping channel of the corresponding stage of the impeller can basically prevent the medium in the corresponding liquid inlet cavity from flowing to the corresponding liquid outlet cavity.

[0055] Exemplarily, the liquid inlet cavity and the liquid outlet cavity of the first-stage impeller 31 are isolated from each other.

[0056] In the embodiment of the present application, in two adjacent impeller stages, the liquid outlet chamber corresponding to the preceding impeller is connected to the liquid inlet chamber corresponding to the succeeding impeller, so that the liquid inlet and liquid outlet chambers corresponding to each impeller stage are sequentially connected in series, and the head of the medium pumped by the impellers within the pump casing 1 is gradually increased. The first-stage impeller 31 is mounted on the first rotating shaft 21, and among all impellers other than the first-stage impeller 31, at least one of the impeller stages is mounted on the second rotating shaft 22. The speeds of the first rotating shaft 21 and the second rotating shaft 22 can be different, and the corresponding rotational speeds of the first-stage impeller 31 mounted on the first rotating shaft 21 and the impeller mounted on the second rotating shaft 22 can also be different. The drive assembly drives at least the first rotating shaft 21 and the second rotating shaft 22 to rotate, so that the rotational speed of the second rotating shaft 22 is greater than the rotational speed of the first rotating shaft 21, and the rotational speed of the impeller mounted on the second rotating shaft 22 is greater than the rotational speed of the first-stage impeller 31. Since the rotational speed of the first-stage impeller 31 is lower, the first-stage impeller 31 is less affected by cavitation, alleviating cavitation in the first-stage impeller 31 and reducing the possibility of damage to the first-stage impeller 31 due to cavitation. Since the impeller mounted on the second rotating shaft 22 has a higher rotational speed, the head of the impeller of the corresponding stage is increased. While basically meeting the same total output head of the delivery pump, the number of impeller stages of the delivery pump can be reduced, thereby reducing the length of the rotating shaft and the volume of the delivery pump, and correspondingly reducing the footprint of the delivery pump. Therefore, the delivery pump of the embodiment of the present application can reduce the footprint of the delivery pump and alleviate the cavitation of the first-stage impeller 31.

[0057] It can be understood that since the liquid inlet chamber of the impeller installed on the second rotating shaft 22 receives the medium that is pumped and pressurized by the first-stage impeller 31, the pressurized medium output by the first-stage impeller 31 is conducive to suppressing the cavitation of all impellers except the first-stage impeller 31, and the cavitation phenomenon of all impellers except the first-stage impeller 31 can also be alleviated to a certain extent.

[0058] It is understandable that when the number of the rotating shafts is greater than two, the rotational speeds of the rotating shafts except the first rotating shaft 21 can be set according to actual needs.

[0059] In one embodiment, please refer to Figures 2 to 5 The liquid outlet cavity corresponding to the first-stage impeller 31 is the first liquid outlet cavity 51, the liquid inlet cavity connected to the first liquid outlet cavity 51 is the second liquid inlet cavity 42, the impeller corresponding to the second liquid inlet cavity 42 is the secondary impeller 32, and the liquid outlet cavity corresponding to the secondary impeller 32 is the second liquid outlet cavity 52.

[0060] It should be noted that the liquid inlet cavity in communication with the first liquid outlet cavity 51 is the second liquid inlet cavity 42, which means that the first liquid outlet cavity 51 is in communication with the second liquid inlet cavity 42, and there is no impeller barrier between the first liquid outlet cavity 51 and the second liquid inlet cavity 42. The medium flowing out of the first liquid outlet cavity 51 can directly flow to the second liquid inlet cavity 42 without flowing through the impeller for pumping.

[0061] Exemplarily, referring to Figures 2 to 5 , the medium flows from the liquid inlet 11 of the pump shell 1 to the first liquid inlet cavity 41, the medium in the first liquid inlet cavity 41 is pumped to the first liquid outlet cavity 51 by the primary impeller 31, the medium in the first liquid outlet cavity 51 flows to the second liquid inlet cavity 42 in communication with the first liquid outlet cavity 51, and the medium in the second liquid inlet cavity 42 is pumped to the second liquid outlet cavity 52 by the secondary impeller 32.

[0062] Exemplarily, referring to Figures 2 to 5 , the number of stages of the impeller is two, the second liquid outlet cavity 52 is in communication with the liquid outlet 12 of the pump shell 1, and the medium in the second liquid outlet cavity 52 is discharged from the pump shell 1 through the liquid outlet 12.

[0063] Exemplarily, referring to Figure 2 and Figure 5 , the primary impeller 31 and the secondary impeller 32 are adjacent two-stage impellers, and the secondary impeller 32 further pumps the medium output by the primary impeller 31. Among the primary impeller 31 and the secondary impeller 32, the primary impeller 31 is a front-stage impeller relative to the secondary impeller 32, and the secondary impeller 32 is a rear-stage impeller relative to the primary impeller 31.

[0064] Exemplarily, the number of stages of the impeller can be greater than two, the second liquid outlet cavity 52 can be in communication with the liquid inlet cavity corresponding to the rear-stage impeller of the secondary impeller 32, and the medium in the second liquid outlet cavity 52 flows to the liquid inlet cavity corresponding to the rear-stage impeller of the secondary impeller 32 and is continuously pumped by the rear-stage impeller of the secondary impeller 32.

[0065] Exemplarily, referring to Figure 2 and Figure 4 , the first liquid inlet cavity 41 and the first liquid outlet cavity 51 are isolated from each other.

[0066] Exemplarily, referring to Figure 2 and Figure 4 , the second liquid inlet cavity 42 and the second liquid outlet cavity 52 are isolated from each other.

[0067] Exemplarily, the primary impeller 31 and the secondary impeller 32 are both sleeved on the first rotating shaft 21 to rotate with the first rotating shaft 21, the next-stage impeller of the secondary impeller 32 is a third-stage impeller, the next-stage impeller of the third-stage impeller is a fourth-stage impeller, and the third-stage impeller and the fourth-stage impeller are sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22.

[0068] In the embodiment of the present application, the medium output by the first-stage impeller 31 is further pumped by the secondary impeller 32, and the total head of the delivery pump is increased by the pumping of multiple stages of impellers.

[0069] In one embodiment, please refer to Figures 2 to 5 The first rotating shaft 21 and the second rotating shaft 22 are arranged at intervals.

[0070] Exemplarily, every two adjacent rotating shafts are arranged at intervals.

[0071] In the embodiment of the present application, the rotational speed of the second rotating shaft 22 is greater than the rotational speed of the first rotating shaft 21, and there is a rotational speed difference between the first rotating shaft 21 and the second rotating shaft 22. The interval arrangement of the first rotating shaft 21 and the second rotating shaft 22 can reduce the mutual interference between the first rotating shaft 21 and the second rotating shaft 22 with different rotational speeds.

[0072] It is understood that the arrangement of the first rotating shaft 21 and the second rotating shaft 22 is not limited. For example, the first rotating shaft 21 and the second rotating shaft 22 can be in contact with each other. For example, the first rotating shaft 21 and the second rotating shaft 22 are rotationally connected.

[0073] In one embodiment, please refer to Figure 3 and Figure 5 The pump housing 1 is formed with a first positioning portion 13 and a second positioning portion 14 arranged at intervals along the axial direction of the rotating shaft. The delivery pump also includes a positioning member 7. Each rotating shaft is correspondingly provided with a positioning member 7. The positioning member 7 is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft. The positioning member 7 abuts between the corresponding first positioning portion 13 and the corresponding second positioning portion 14 along the axial direction of the corresponding rotating shaft.

[0074] For example, see Figures 2 to 5 The first rotating shaft 21 and the second rotating shaft 22 are arranged at intervals. The first positioning portion 13 corresponding to the first rotating shaft 21 and the first positioning portion 13 corresponding to the second rotating shaft 22 are both located between the first rotating shaft 21 and the second rotating shaft 22 along the axial direction of the first rotating shaft 21. The first rotating shaft 21 has a first positioning portion 13 and a second positioning portion 14, and the second rotating shaft 22 has a first positioning portion 13 and a second positioning portion 14. The two first positioning portions 13 are located between the two second positioning portions 14 along the axial direction of the first rotating shaft 21.

[0075] The positioning member 7 is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft. The positioning member 7 is substantially stationary relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft, that is, the positioning member 7 substantially does not move relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft. For example, the positioning member 7 corresponding to the first rotating shaft 21 substantially does not move relative to the first rotating shaft 21 along the axial direction of the first rotating shaft 21, and the positioning member 7 corresponding to the second rotating shaft 22 substantially does not move relative to the second rotating shaft 22 along the axial direction of the second rotating shaft 22.

[0076] The positioning member 7 is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft, and does not restrict the positioning member 7 from rotating relative to the corresponding rotating shaft.

[0077] Exemplarily, the positioning member 7 may be a bearing.

[0078] Illustratively, the bearing may be a water-lubricated bearing.

[0079] For example, see Figures 2 to 5 The first positioning portion 13 and the second positioning portion 14 both protrude from the pump housing 1 along the radial direction of the corresponding rotating shaft toward the corresponding rotating shaft.

[0080] For example, see Figures 2 to 5 The first rotating shaft 21 and the second rotating shaft 22 are respectively passed through corresponding bearings.

[0081] In the embodiment of the present application, the positioning member 7 abuts between the corresponding first positioning portion 13 and the corresponding second positioning portion 14 along the axial direction of the corresponding rotating shaft, and the positioning member 7 is positioned relative to the pump housing 1 along the direction of the corresponding rotating shaft by the first positioning portion 13 and the second positioning portion 14 of the pump housing 1, that is, the positioning member 7 basically does not move relative to the pump housing 1 along the axial direction of the corresponding rotating shaft. Since the positioning member 7 is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft, the first positioning portion 13 and the second positioning portion 14 determine the position of the positioning member 7 relative to the pump housing 1 along the axial direction of the rotating shaft, and accordingly determine the position of the rotating shaft corresponding to the positioning member 7 relative to the pump housing 1 along the axial direction of the corresponding rotating shaft, thereby achieving the positioning of the rotating shaft corresponding to the positioning member 7 relative to the pump housing 1 along the axial direction of the corresponding rotating shaft, that is, the rotating shaft basically does not move relative to the pump housing 1 along the axial direction of the rotating shaft.

[0082] It is understood that the embodiments of the present application are not limited to positioning the corresponding rotating shaft by the first positioning portion 13 and the second positioning portion 14. For example, the rotating shaft and the pump housing 1 can be interference-fitted in the radial direction of the rotating shaft so that the rotating shaft is substantially maintained at a determined position relative to the pump housing 1 along the axial direction of the rotating shaft.

[0083] In one embodiment, please refer to Figures 2 to 5 The pump housing 1 includes a main housing 15 and an end cover 16. The impeller is located within the main housing 15. The main housing 15 and each stage of the impeller are respectively surrounded by a corresponding liquid inlet and outlet cavity. The rotating shaft is provided through the main housing 15 and can rotate relative to the main housing 15. The first positioning portion 13 is formed on the main housing 15. The end cover 16 is located within the main housing 15 and is detachably connected to the main housing 15. The second positioning portion 14 is formed on the end cover 16. Each rotating shaft is provided with an end cover 16.

[0084] For example, see Figures 2 to 5 , the first rotating shaft 21 and the second rotating shaft 22 can both rotate relative to the main housing 15.

[0085] In the embodiment of the present application, the first positioning portion 13 is formed on the main housing 15, and the second positioning portion 14 is formed on the end cover 16. When the positioning member 7 with the rotating shaft needs to be assembled, due to the detachable connection between the end cover 16 and the main housing 15, the end cover 16 can be removed from the main housing 15, thereby increasing the distance between the first positioning portion 13 and the second positioning portion 14, making it easier to assemble the positioning member 7 to the corresponding position. The end cover 16 is then installed on the main housing 15, so that the positioning member 7 is roughly clamped between the first positioning portion 13 and the second positioning portion 14. The detachable connection between the end cover 16 and the main housing 15 makes it easier to disassemble and assemble the positioning member 7 on the pump housing 1.

[0086] It is understood that the structure of the pump housing 1 of the embodiment of the present application is not limited. For example, the pump housing 1 and the end cover 16 can be non-detachably connected. For example, the pump housing 1 and the end cover 16 can be integrally formed as appropriate.

[0087] In one embodiment, please refer to Figures 2 to 5 The end cover 16 is located at one end of the corresponding positioning member 7 along the axial direction of the corresponding rotating shaft toward the corresponding impeller.

[0088] For example, see Figures 2 to 5 The end cover 16 is located at the corresponding positioning member 7 along the axial direction of the corresponding rotating shaft toward the corresponding liquid outlet cavity. The end cover 16 is exposed in the liquid outlet cavity. The corresponding liquid outlet cavity is located at one end of the corresponding positioning member 7 along the axial direction of the corresponding rotating shaft toward the corresponding impeller.

[0089] For example, see Figures 2 to 5 The end cover 16 corresponding to the first rotating shaft 21 is located at one end of the corresponding positioning member 7 along the axial direction of the first rotating shaft 21 toward the first-stage impeller 31, that is, toward one end of the first liquid outlet cavity 51, and the corresponding end cover 16 can be exposed in the corresponding first liquid outlet cavity 51.

[0090] For example, see Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The end cover 16 corresponding to the second rotating shaft 22 is located at the corresponding positioning member 7 along the axial direction of the second rotating shaft 22 toward one end of the secondary impeller 32, that is, toward one end of the second liquid outlet cavity 52. ​​The corresponding end cover 16 can be exposed in the corresponding second liquid outlet cavity 52.

[0091] In the embodiment of the present application, the impeller is located in the main shell 15, and there is a space in the main shell 15 for accommodating the impeller. The position of the end cover 16 is arranged so that the end cover 16 is roughly exposed in the space in the main shell 15 for accommodating the impeller. During the disassembly and assembly process, after the impeller is removed, the end cover 16 roughly exposed in the space in the main shell 15 for accommodating the impeller can be disassembled and assembled more conveniently.

[0092] It is understandable that the position of the end cover 16 in the embodiment of the present application is not limited. For example, the end cover 16 can be located at the end of the corresponding positioning member 7 along the axial direction of the corresponding rotating shaft away from the impeller.

[0093] In one embodiment, please refer to Figures 2 to 5 The main housing 15 includes a shell 151 and a positioning sleeve 152. The impeller is located in the shell 151, and the rotating shaft is provided in the shell 151, and the rotating shaft can rotate relative to the shell 151. The positioning sleeve 152 is located in the shell 151, and the first positioning portion 13 is formed on the positioning sleeve 152. The positioning sleeve 152 is detachably connected to the shell 151. The shell 151, the impeller of the corresponding stage and the corresponding positioning sleeve 152 are arranged to form one of the corresponding liquid inlet cavity and liquid outlet cavity. The end cover 16 is located in the shell 151, and the end cover 16 is detachably connected to the positioning sleeve 152.

[0094] For example, see Figures 1 to 5 The housing 151 includes two sub-shells 1511 , which are arranged in an up-down direction and are detachably connected.

[0095] For example, see Figures 2 to 5 One of the positioning sleeve 152 and the shell 151 is formed with a boss, and the other of the positioning sleeve 152 and the shell 151 is formed with a groove. The boss and the groove are positioned and matched to position the positioning sleeve 152 relative to the shell 151 along the axial direction of the corresponding rotating shaft.

[0096] Illustratively, the positioning sleeve 152 and the housing 151 are interference fit.

[0097] Illustratively, when the boss is formed on the housing 151 , the boss is formed on the sub-housing 1511 therebelow.

[0098] Exemplarily, when the groove is formed in the housing 151 , the groove is formed in the sub-housing 1511 therebelow.

[0099] For example, see Figures 2 to 5 The positioning sleeve 152 is provided with end covers 16 at both ends along the axial direction of the first rotating shaft 21 , wherein the end cover 16 at one end corresponds to the first rotating shaft 21 , and the end cover 16 at the other end corresponds to the second rotating shaft 22 .

[0100] For example, see Figures 2 to 5 The casing 151, the impeller of the corresponding stage and the corresponding positioning sleeve 152 are arranged to form a corresponding liquid outlet cavity.

[0101] For example, see Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate along with the second rotating shaft 22 .

[0102] For example, see Figures 2 to 5The two ends of the positioning sleeve 152 are respectively sleeved on the first rotating shaft 21 and the second rotating shaft 22.

[0103] For example, see Figures 2 to 5 The housing 151 , the first-stage impeller 31 and the corresponding positioning sleeve 152 are arranged around the first liquid outlet cavity 51 .

[0104] For example, see Figures 2 to 5 The housing 151 , the secondary impeller 32 and the corresponding positioning sleeve 152 are arranged to form a second liquid outlet cavity 52 .

[0105] In the embodiment of the present application, the rotating shaft will bear a certain degree of axial load. This axial load of the rotating shaft is transmitted to the first positioning portion 13 and the second positioning portion 14 through the positioning member 7. The second positioning portion 14, which bears the axial load, needs to be replaced and maintained. Because the positioning sleeve 152 is detachably connected to the housing 151, the second positioning portion 14 can be replaced and maintained by disassembling and replacing the positioning sleeve 152. The positioning sleeve 152 is part of the main housing 15. Replacing the positioning sleeve 152 can help reduce the cost of replacing and maintaining the second positioning portion 14.

[0106] In one embodiment, please refer to Figures 2 to 5 The delivery pump also includes a partition 8, which is arranged between the first rotating shaft 21 and the second rotating shaft 22. The partition 8 is connected to the positioning sleeve 152 to separate the first rotating shaft 21 and the second rotating shaft 22 on opposite sides of the corresponding partition 8.

[0107] For example, see Figures 2 to 5 A small amount of medium from the first liquid outlet chamber 51 escapes through the space between the first rotating shaft 21 and the corresponding positioning member 7 and is blocked by the partition 8. The partition 8 prevents the medium from leaking from the first liquid outlet chamber 51 through the space between the first rotating shaft 21 and the corresponding positioning member 7 to the second liquid outlet chamber 52. A small amount of medium from the second liquid outlet chamber 52 escapes through the space between the second rotating shaft 22 and the corresponding positioning member 7 and is blocked by the partition 8. The partition 8 prevents the medium from leaking from the second liquid outlet chamber 52 through the space between the second rotating shaft 22 and the corresponding positioning member 7 to the first liquid outlet chamber 51.

[0108] In the embodiment of the present application, the first rotating shaft 21 and the second rotating shaft 22 are separated on both sides of the partition 8 by the partition 8. The partition 8 can suppress leakage between the first rotating shaft 21 and the second rotating shaft 22, thereby reducing leakage of the medium at the rotating shaft.

[0109] In one embodiment, please refer to Figures 2 to 5 , the partition plate 8 and the positioning sleeve 152 are sealed.

[0110] Exemplarily, the partition plate 8 and the positioning sleeve 152 are welded or integrally formed.

[0111] In the embodiment of the present application, the partition plate 8 and the positioning sleeve 152 are sealed to reduce the possibility of leakage of the medium between the partition plate 8 and the positioning sleeve 152.

[0112] In one embodiment, please refer to Figures 2 to 5 , the positioning sleeve 152 is sealed with the housing 151 .

[0113] Illustratively, the positioning sleeve 152 and the housing 151 are sealed by a sealing packing or other sealing members.

[0114] For example, see Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The medium in the first liquid outlet chamber 51 is difficult to leak to the second liquid outlet chamber 52 through the sealed positioning sleeve 152 and the shell 151, and the medium in the second liquid outlet chamber 52 is difficult to leak to the first liquid outlet chamber 51 through the sealed positioning sleeve 152 and the shell.

[0115] In the embodiment of the present application, the positioning sleeve 152 and the housing 151 are sealed to reduce the possibility of leakage of the medium from between the positioning sleeve 152 and the housing 151.

[0116] In one embodiment, please refer to Figures 2 to 5 , the partition plate 8 is sealed with the positioning sleeve 152 , and the positioning sleeve 152 is sealed with the shell 151 .

[0117] For example, see Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The medium in the first liquid outlet chamber 51 is difficult to leak into the second liquid outlet chamber 52 through the sealed space between the partition plate 8 and the positioning sleeve 152, and between the sealed positioning sleeve 152 and the housing 151. The medium in the second liquid outlet chamber 52 is difficult to leak into the first liquid outlet chamber 51 through the sealed space between the partition plate 8 and the positioning sleeve 152, and between the sealed positioning sleeve 152 and the housing 151.

[0118] In the embodiment of the present application, the mutual leakage between the impellers of two adjacent stages at the corresponding rotating shafts can be reduced as much as possible by sealing the partition plate 8 with the positioning sleeve 152 and sealing the positioning sleeve 152 with the housing 151.

[0119] It is understood that the specific method of sealing the partition plate 8 and the positioning sleeve 152 is not limited. The partition plate 8 and the positioning sleeve 152 can be sealed by a sealing member.

[0120] It is understandable that the specific method of sealing the positioning sleeve 152 and the housing 151 is not limited. The positioning sleeve 152 and the housing 151 can be integrally formed or welded.

[0121] In one embodiment, please refer to Figures 2 to 5The delivery pump also includes a partition 8 , which is arranged between the first rotating shaft 21 and the second rotating shaft 22 , and the partition 8 is connected to the pump housing 1 to separate the first rotating shaft 21 and the second rotating shaft 22 on opposite sides of the corresponding partition 8 .

[0122] For example, see Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. A small amount of medium escaping from the first rotating shaft 21 of the first liquid outlet chamber 51 is blocked by the partition 8, which can reduce the possibility of the medium in the first liquid outlet chamber 51 leaking into the second liquid outlet chamber 52 to a certain extent. A small amount of medium escaping from the second rotating shaft 22 of the second liquid outlet chamber 52 is blocked by the partition 8, which can reduce the possibility of the medium in the second liquid outlet chamber 52 leaking into the first liquid outlet chamber 51 to a certain extent.

[0123] In the embodiment of the present application, the first rotating shaft 21 and the second rotating shaft 22 are separated on opposite sides of the partition 8 by connecting to the pump housing 1 , which can reduce the possibility of medium leakage from the first rotating shaft 21 to the second rotating shaft 22 .

[0124] In one embodiment, please refer to Figures 2 to 5 , the partition 8 and the pump casing 1 are sealed.

[0125] In the embodiment of the present application, the partition plate 8 and the pump housing 1 are sealed to reduce the possibility of leakage of the medium from between the partition plate 8 and the pump housing 1.

[0126] In one embodiment, please refer to Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The first liquid outlet cavity 51 and the second liquid outlet cavity 52 are both located between the first liquid inlet cavity 41 and the second liquid inlet cavity 42 along the axial direction of the rotating shaft.

[0127] In the embodiment of the present application, the liquid inlet direction of the primary impeller 31 and the liquid inlet direction of the secondary impeller 32 are substantially opposite, and the axial force generated by the primary impeller 31 and the axial force generated by the secondary impeller 32 can offset each other as much as possible.

[0128] In one embodiment, please refer to Figures 2 to 5 The secondary impeller 32 is sleeved on the second rotating shaft 22 to rotate with the second rotating shaft 22. The first liquid inlet cavity 41 and the second liquid inlet cavity 42 are both located between the first liquid outlet cavity 51 and the second liquid outlet cavity 52 along the rotating shaft.

[0129] In the embodiment of the present application, the liquid inlet direction of the primary impeller 31 and the liquid inlet direction of the secondary impeller 32 are substantially opposite, and the axial force generated by the primary impeller 31 and the axial force generated by the secondary impeller 32 can offset each other as much as possible.

[0130] It is understood that the arrangement of the liquid inlet cavity and the liquid outlet cavity is not limited. For example, the first liquid outlet cavity 51 and the second liquid inlet cavity 42 can both be located between the first liquid inlet cavity 41 and the first liquid outlet cavity 51. For example, the first liquid inlet cavity 41 and the second liquid outlet cavity 52 can both be located between the first liquid outlet cavity 51 and the second liquid inlet cavity 42.

[0131] In one embodiment, please refer to Figures 2 to 6 The first rotating shaft 21 and the second rotating shaft 22 are both partially located outside the pump housing 1 so as to be drivenly connected to the driving assembly respectively.

[0132] For example, see Figures 2 to 5 The first rotating shaft 21 and the second rotating shaft 22 are arranged along the axial direction of the first rotating shaft 21 .

[0133] For example, see Figures 2 to 6 One end of the first rotating shaft 21 facing away from the second rotating shaft 22 extends to the outside of the pump housing 1 , and one end of the second rotating shaft 22 facing away from the first rotating shaft 21 extends to the outside of the pump housing 1 .

[0134] In the embodiment of the present application, since the first rotating shaft 21 and the second rotating shaft 22 are both partially located outside the pump casing 1, the parts of the first rotating shaft 21 and the second rotating shaft 22 located outside the pump casing 1 can be more conveniently connected to the drive assembly, thereby driving the first rotating shaft 21 and the second rotating shaft 22 to rotate at different speeds respectively through the drive assembly.

[0135] In one embodiment, please refer to Figure 2 and Figure 4 The drive assembly includes multiple drivers, each of which is connected to the corresponding rotating shaft to drive the corresponding rotating shaft to rotate.

[0136] For example, see Figure 2 and Figure 4 There are two drivers, one of which drives the first rotating shaft 21 to rotate at one end away from the second rotating shaft 22 , and the other drives the second rotating shaft 22 to rotate at one end away from the first rotating shaft 21 .

[0137] In the embodiment of the present application, each driver drives the corresponding shaft to rotate, and the rotational speed of each shaft can be set according to actual needs. Therefore, the configuration of the rotational speed of each stage of the impeller is more flexible.

[0138] In one embodiment, please refer to Figure 6 The drive assembly includes a transmission device 62 and a driver. Each rotating shaft is respectively installed on the transmission device 62. The driver drives the transmission device 62 to rotate so that the transmission device 62 drives each rotating shaft to rotate.

[0139] For example, see Figure 6The transmission device 62 includes a transmission shaft 621 and two pulley assemblies 622 mounted on the transmission shaft 621. Each pulley assembly 622 is arranged across the transmission shaft 621 and a corresponding rotating shaft. The transmission shaft 621 is connected to a driver so that the driver drives the transmission shaft 621 to rotate. The two pulley assemblies 622 output different rotational speeds.

[0140] For example, see Figure 6 One pulley assembly 622 is arranged across the transmission shaft 621 and the first rotating shaft 21 , and the other pulley assembly 622 is arranged across the transmission shaft 621 and the second rotating shaft 22 .

[0141] In the embodiment of the present application, a driver drives the transmission device 62 to drive the corresponding rotating shaft to rotate, so that the impellers of different stages can have different rotational speeds, so that a smaller number of drivers can be used to make the first-stage impeller 31 and all the impellers except the first-stage impeller 31 have different rotational speeds.

[0142] In one embodiment, please refer to Figure 7 The delivery pump further includes a first locking member 901, a first sleeve 902, a second sleeve 903, and a second locking member 904. Each rotating shaft is threadedly connected to the corresponding first locking member 901, and the first locking member 901 abuts the corresponding positioning member 7. Each rotating shaft is inserted into the corresponding first sleeve 902, and the first sleeve 902 abuts the corresponding positioning member 7 and the impeller. Each rotating shaft is inserted into the corresponding second sleeve 903, and the second sleeve 903 is located on the side of the corresponding impeller facing away from the corresponding first sleeve 902. Each rotating shaft is threadedly connected to the corresponding second locking member 904, and the second sleeve 903 abuts the second locking member 904 and the impeller.

[0143] Exemplarily, the first locking member 901 and the second locking member 904 are nuts.

[0144] In the embodiment of the present application, the first locking member 901 and the second locking member 904 are respectively threadedly connected to the corresponding rotating shaft to tighten the structure between the first locking member 901 and the second locking member 904. The first locking member 901, the corresponding positioning member 7, the corresponding first sleeve 902, the impeller of the corresponding stage, the second sleeve 903 and the second locking member 904 are abutted in sequence to achieve the fixing of the positioning member 7 relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft.

[0145] 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. A delivery pump, characterized in that: include: a pump housing having a liquid inlet for receiving a pumping medium and a liquid outlet for discharging the pumping medium; a rotating shaft, passing through the pump housing, the rotating shaft being rotatable relative to the pump housing, the rotating shaft being plural in number, at least one rotating shaft being a first rotating shaft, and at least one rotating shaft being a second rotating shaft; An impeller is located in the pump casing, wherein each stage of the impeller and the pump casing are surrounded by a liquid inlet cavity and a liquid outlet cavity that are isolated from each other, the liquid inlet cavity being connected to the liquid inlet being the first liquid inlet cavity, the impeller of the stage corresponding to the first liquid inlet cavity being the first-stage impeller, the first-stage impeller being sleeved on the first rotating shaft to rotate along with the first rotating shaft, the liquid outlet cavity corresponding to the preceding-stage impeller of two adjacent stages being connected to the liquid inlet cavity corresponding to the succeeding-stage impeller of all the impellers except the first-stage impeller, the impeller of at least one stage being sleeved on the second rotating shaft to rotate along with the second rotating shaft; a drive assembly for driving at least the first rotating shaft and the second rotating shaft to rotate, so that the rotation speed of the second rotating shaft is greater than the rotation speed of the first rotating shaft; The pump housing is formed with a first positioning portion and a second positioning portion arranged at intervals along the axial direction of the rotating shaft. The delivery pump further includes a positioning member, each rotating shaft is correspondingly provided with the positioning member, the positioning member is fixed relative to the corresponding rotating shaft along the axial direction of the corresponding rotating shaft, and the positioning member abuts between the corresponding first positioning portion and the corresponding second positioning portion along the axial direction of the corresponding rotating shaft; The pump housing comprises: A main housing, wherein the impeller is located in the main housing, the main housing and each stage of the impeller are respectively arranged to enclose the liquid inlet cavity and the liquid outlet cavity corresponding to each other, the rotating shaft is passed through the main housing, the rotating shaft can rotate relative to the main housing, and the first positioning portion is formed on the main housing; an end cover located in the main housing, the end cover being detachably connected to the main housing, the second positioning portion being formed on the end cover, and each of the rotating shafts being correspondingly provided with the end cover; The main shell includes: a housing, wherein the impeller is located in the housing, the rotating shaft passes through the housing, and the rotating shaft is rotatable relative to the housing; A positioning sleeve is located in the shell, the first positioning portion is formed on the positioning sleeve, the positioning sleeve is detachably connected to the shell, the shell, the impeller of the corresponding stage and the corresponding positioning sleeve are arranged to form one of the corresponding liquid inlet cavity and the liquid outlet cavity, the end cover is located in the shell, and the end cover is detachably connected to the positioning sleeve.

2. The delivery pump according to claim 1, characterized in that The first rotating shaft and the second rotating shaft are arranged at intervals.

3. The delivery pump according to claim 2, characterized in that The end cover is located at one end of the corresponding positioning member along the axial direction of the corresponding rotating shaft facing the corresponding impeller.

4. The delivery pump according to claim 2, characterized in that The delivery pump further includes a partition plate, which is disposed between the first rotating shaft and the second rotating shaft, and the partition plate is connected to the positioning sleeve to separate the first rotating shaft and the second rotating shaft on opposite sides corresponding to the partition plate; The partition is sealed with the positioning sleeve, and / or the positioning sleeve is sealed with the housing.

5. The delivery pump according to claim 2, characterized in that The delivery pump further includes a partition plate, which is disposed between the first rotating shaft and the second rotating shaft. The partition plate is connected to the pump housing to separate the first rotating shaft and the second rotating shaft on opposite sides corresponding to the partition plate.

6. The delivery pump according to claim 5, characterized in that The partition plate is sealed against the pump housing.

7. The delivery pump according to any one of claims 1 to 6, characterized in that: The liquid outlet cavity corresponding to the first-stage impeller is the first liquid outlet cavity, the liquid inlet cavity connected to the first liquid outlet cavity is the second liquid inlet cavity, the impeller corresponding to the second liquid inlet cavity is the secondary impeller, the liquid outlet cavity corresponding to the secondary impeller is the second liquid outlet cavity, and the secondary impeller is sleeved on the second rotating shaft to rotate with the second rotating shaft; The first liquid outlet cavity and the second liquid outlet cavity are both located between the first liquid inlet cavity and the second liquid inlet cavity along the axial direction of the rotating shaft; or, the first liquid inlet cavity and the second liquid inlet cavity are both located between the first liquid outlet cavity and the second liquid outlet cavity along the rotating axis of the rotating shaft.

8. The delivery pump according to any one of claims 1 to 6, characterized in that: The first rotating shaft and the second rotating shaft are both partially located outside the pump housing so as to be drivingly connected to the driving assembly respectively.

9. The delivery pump according to any one of claims 1 to 6, characterized in that: The drive assembly includes a plurality of drivers, each of which is connected to the corresponding rotating shaft to drive the corresponding rotating shaft to rotate; and / or, the drive assembly includes a transmission device and a driver, each rotating shaft is respectively installed on the transmission device, and the driver drives the transmission device to rotate so that the transmission device drives each rotating shaft to rotate respectively.

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