A multi-stage centrifugal hydrophobic pump

Abstract

The application discloses a multistage centrifugal drainage pump, and belongs to the technical field of the drainage pump.The multistage centrifugal drainage pump comprises a pump shell and a rotating driving device, a plurality of pump cavities and a water outlet cavity are evenly arranged in the pump shell, the adjacent two pump cavities and the pump cavity and the water outlet cavity adjacent to the water outlet cavity are separated through mounting plates, mounting holes and a plurality of water through holes are arranged on the mounting plates, water sending parts corresponding to the pump cavities are arranged in the pump shell, the water sending parts comprise impellers and fixing shafts fixedly connected with coaxial shafts, the impellers are located in the pump cavities, the fixing shafts are rotatably connected in the mounting holes, inner splines are arranged in the shaft holes of the water sending parts, adjusting shafts are slidably connected in the shaft holes, the adjusting shafts are connected with the translational force devices, outer splines corresponding to the water sending parts are arranged on the adjusting shafts, and the fixing shafts on the water sending parts located at the end pass through the pump shell and are connected with the rotating driving device.The multistage centrifugal drainage pump with the above structure is simple in structure and convenient to adjust the lift according to the requirement.

Description

Technical Field

[0001] This invention belongs to the field of condensate pump technology, and particularly relates to a multi-stage centrifugal condensate pump. Background Technology

[0002] Steam traps are important water supply equipment in the boiler condensate system of power plants. Because the medium being transported has a small flow rate and high pressure, and the system inlet pressure is low, steam traps are required to have characteristics such as small flow rate and high head, and to operate under low net positive suction head (NPSH) conditions.

[0003] Existing condensate pumps are typically single-stage pumps, and their head cannot meet the requirements of new waste gas power generation and biomass power plants. Currently, in order to meet the operating conditions of waste gas power generation and biomass power plants, most use horizontal multi-stage pumps to reduce the speed and increase the number of pump stages. However, this approach results in condensate pumps with complex structures, large size, poor operational stability, and high manufacturing costs.

[0004] Chinese patent application CN202420059107.2 discloses a structure suitable for a multistage pump with adjustable head, including a multistage pump body. Within the pump body are multiple intermediate sections, each comprising guide vanes, an impeller, a sealing ring, and a guide vane sleeve. The guide vane sleeve is installed within the guide vanes via a transition fit, and the sealing ring is installed within the intermediate sections via a transition fit. The sealing ring and guide vane sleeve constitute the stator component, and the impeller constitutes the rotor component, with a gap between the stator and rotor components. Impeller retainers and intermediate section retainers are provided at the locations where one or more intermediate sections are removed. While this structure allows for changing the number of stages to meet different head requirements without altering the overall dimensions of the multistage pump, it requires disassembling and reassembling the multistage pump body to change the head, making it inconvenient to use.

[0005] To solve the above problems, a new type of multistage centrifugal condensate pump is needed. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage centrifugal condensate pump with a simple structure and convenient head adjustment as needed.

[0007] To achieve the above objectives, the present invention provides a multi-stage centrifugal condensate pump, comprising a pump casing and a rotary drive device. The pump casing contains a plurality of pump chambers evenly distributed along its length and a water outlet chamber. Adjacent pump chambers and the pump chamber adjacent to the water outlet chamber are separated by mounting plates. The mounting plates have mounting holes and several water passage holes. The pump casing contains water delivery components corresponding to each pump chamber. Each water delivery component includes an impeller and a fixed shaft coaxially fixedly connected. The impeller is located within the pump chamber, and the fixed shaft is rotatably connected within the mounting holes. An internal spline is provided within the central hole of the water delivery component, and an adjusting shaft is slidably connected within the central hole. The adjusting shaft is connected to a translational power device. An external spline corresponding to each water delivery component is provided on the adjusting shaft, and the external spline is adapted to the structure of the internal spline. The fixed shaft on the water delivery component at its end protrudes from the pump casing and connects to the rotary drive device.

[0008] Preferably, a locking component and an unlocking component are provided between the fixed shaft and the mounting hole, which are completely located inside the pump housing. The locking component is used to prevent the water delivery component from rotating in the mounting hole, and the unlocking component is used to unlock the water delivery component and restore its rotatability in the mounting hole.

[0009] Preferably, the locking assembly includes a socket and a protrusion. The socket is symmetrically arranged on the end face of the fixed shaft. A first spring is provided in the socket along the length direction of the socket. One end of the first spring is fixedly connected to the inner wall of the socket, and the other end of the first spring is fixedly connected to a movable rod. The end of the movable rod away from the first spring is connected to a locking block. The locking block has a through hole in the middle for the adjusting shaft to pass through. A notch is provided on the curved side wall of the locking block. The protrusion is fixedly connected to the inner wall of the mounting hole. When the first spring is in its natural state, the protrusion is adapted to the notch.

[0010] The unlocking component is fixed on the adjusting shaft and is configured to correspond one-to-one with the locking block. The unlocking component includes an unlocking groove. An electromagnet and a second spring are fixedly connected to the bottom of the unlocking groove. The end of the second spring away from the electromagnet is fixedly connected to the unlocking block. A magnet is fixedly connected to the side of the unlocking block opposite to the electromagnet. The magnet has the opposite magnetic properties to the electromagnet when it is energized. When the electromagnet is de-energized, the top of the unlocking block extends out of the unlocking groove.

[0011] Preferably, the rotary drive device includes a rotary drive motor, a drive gear, and a driven gear. The drive gear is fixedly connected to the output shaft of the rotary drive motor, and the driven gear is coaxially fixedly connected to the outer wall of the fixed shaft that passes through the pump housing, and the driven gear is meshed with the drive gear.

[0012] Preferably, the rotary drive motor is fixedly mounted on a drive base, and the drive base is provided with a through hole, through which the fixed shaft passing through the pump housing is rotatably connected.

[0013] Preferably, the translational power device includes a guide seat with a guide groove. A threaded rod is rotatably connected in the guide groove. The threaded rod is parallel to the adjusting shaft. One end of the threaded rod is connected to a translational drive motor. A movable seat is threadedly connected to the threaded rod. The movable seat is slidably connected in the guide groove. The movable seat is rotatably connected to the adjusting shaft and can drive the adjusting shaft to move back and forth.

[0014] Preferably, an outlet and an inlet are fixedly connected to the outer wall of the pump casing, the outlet is connected to the outlet cavity, and the inlet is connected to the pump cavity away from the outlet cavity.

[0015] Preferably, a first sealing ring is fitted on the fixed shaft that extends out of the pump housing, and the first sealing ring is in contact with the outer wall of the pump housing.

[0016] Preferably, a sealing cover is slidably connected to the adjusting shaft, and a second sealing ring is fixedly connected inside the sealing cover. The center hole of the second sealing ring is slidably and sealingly connected to the adjusting shaft. One end of the sealing cover is threadedly connected to the outer side end of the fixed shaft that passes through the pump housing. After the sealing cover is threadedly connected, the second sealing ring is in contact with the end face of the fixed shaft that passes through the pump housing.

[0017] Therefore, the multi-stage centrifugal condensate pump of the present invention, employing the above-described structure, has the following beneficial effects:

[0018] 1. A rotary drive device is used to drive the water delivery component that protrudes from the pump casing to rotate. The water delivery component that protrudes from the pump casing drives the adjusting shaft to rotate. The adjusting shaft drives the water delivery component connected to it to rotate, thereby providing power for the liquid to be transported. A translational force device can drive the adjusting shaft to move horizontally, so as to change the number of water delivery components that are connected to the adjusting shaft, thereby realizing the adjustment of the pump head.

[0019] 2. Use the locking component to lock the inactive water supply component to prevent it from rotating under the action of water flow when it is not working, which would affect its subsequent connection with the adjusting shaft. Use the unlocking component to unlock the corresponding water supply component, so that the unlocked water supply component can rotate and thus provide power for the delivery of liquid.

[0020] 3. By utilizing the locking and unlocking components in this invention, any number of water delivery components can rotate simultaneously, resulting in high flexibility and strong applicability.

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of a multi-stage centrifugal condensate pump according to the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a water delivery component in a multi-stage centrifugal condensate pump according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of a multi-stage centrifugal condensate pump in use according to the present invention;

[0025] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0026] Figure 5 for Figure 3 A magnified view of a section at point B in the middle;

[0027] Figure 6 for Figure 1 A magnified view of a section at point C.

[0028] In the diagram: 1. Pump casing; 2. Rotary drive device; 201. Rotary drive motor; 202. Drive gear; 203. Driven gear; 3. Pump chamber; 4. Water outlet chamber; 5. Mounting plate; 6. Mounting hole; 7. Water passage hole; 8. Water delivery component; 81. Impeller; 82. Fixed shaft; 9. Bearing; 10. Internal spline; 11. Adjusting shaft; 12. External spline; 13. Locking assembly; 131. Insertion hole; 132. Protrusion; 133. First spring; 13 4. Movable rod; 135. Locking block; 136. Through hole; 137. Notch; 14. Unlocking component; 141. Unlocking groove; 142. Second spring; 143. Unlocking block; 15. Drive seat; 16. Translational power device; 161. Guide seat; 162. Guide groove; 163. Threaded rod; 164. Translational drive motor; 165. Movable seat; 17. Snap ring; 18. Convex ring; 19. Outlet; 20. Inlet; 21. Sealing cover. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example

[0032] Reference Figures 1-6 As shown, this embodiment provides a multi-stage centrifugal condensate pump, including a pump casing 1 and a rotary drive device 2. The pump casing 1 has multiple pump chambers 3 evenly distributed along its length and a water outlet chamber 4, with at least two pump chambers 3. Adjacent pump chambers 3 and the pump chambers 3 and 4 adjacent to each other are separated by mounting plates 5, which have mounting holes 6 and several water passage holes 7. The pump casing 1 has water delivery components 8 corresponding to the pump chambers 3, each including an impeller 81 and a fixed shaft 82 coaxially fixedly connected. The impeller 81 is located within the pump chamber 3, and the fixed shaft 82 is rotatably connected to the mounting holes 6. In this embodiment, the fixed shaft 82 is rotatably connected to the mounting holes 6 via bearings 9 fixed to the pump casing 1. The spindle hole of the water delivery component 8 has an internal spline 10, and an adjusting shaft 11 is slidably connected within the spindle hole. The adjusting shaft 11 is connected to a translational power device 16. The adjusting shaft 11 is provided with external splines 12 that correspond one-to-one with the water delivery components 8. The external splines 12 are structurally compatible with the internal splines 10. The compatible connection between the internal splines 10 and the external splines 12 enables the transmission connection between the adjusting shaft 11 and the water delivery components 8. The fixed shaft 82 on the water delivery component 8 at the end protrudes from the pump housing 1 and is connected to the rotary drive device 2.

[0033] In use, the translational power device 16 drives the adjusting shaft 11 to move horizontally a certain distance, so that the adjusting shaft 11 is connected to a suitable number of water delivery components 8, thereby realizing the adjustment of the pump head. Then, the rotary drive device 2 drives the fixed shaft 82 that passes through the pump casing 1 to rotate. After the fixed shaft 82 passes through the pump casing 1 rotates, the water delivery components 8 that pass through the pump casing 1 rotate accordingly. The water delivery components 8 that pass through the pump casing 1 drive the adjusting shaft 11 to rotate, and the adjusting shaft 11 drives the water delivery components 8 connected to it to rotate, thereby providing the power to transport the liquid.

[0034] In a further preferred embodiment, a locking component 13 and an unlocking component 14 are provided between the fixed shaft 82, which is completely located inside the pump housing 1, and the mounting hole 6. The locking component 13 is used to prevent the water delivery component 8 from rotating within the mounting hole 6, and the unlocking component 14 is used to unlock the water delivery component 8 and restore its rotatability within the mounting hole 6.

[0035] In use, the locking component 13 locks the fixed shaft 82 on the non-working water delivery component 8 in the mounting hole 6 to prevent the water delivery component 8 from rotating under the action of water flow when it is not working, which would cause the internal spline 10 in the shaft hole of the water delivery component 8 to misalign with the external spline 12 on the adjusting shaft 11, thus affecting the subsequent connection between the water delivery component 8 and the adjusting shaft 11; the unlocking component 14 unlocks the water delivery component 8 corresponding to the unlocking component 14, so that the unlocked water delivery component 8 can rotate under the drive of the adjusting shaft 11 to provide power for the delivery of liquid.

[0036] In a further preferred embodiment, the locking assembly 13 includes a socket 131 and a protrusion 132. The socket 131 is symmetrically arranged on the end face of the fixed shaft 82. A first spring 133 is provided inside the socket 131, arranged along the length direction of the socket 131. One end of the first spring 133 is fixedly connected to the inner wall of the socket 131, and the other end of the first spring 133 is fixedly connected to the movable rod 134. The end of the movable rod 134 away from the first spring 133 is connected to the locking block 135. The locking block 135 has a through hole 136 in the middle for the adjusting shaft 11 to pass through, and a notch 137 is provided on the curved side wall of the locking block 135. The protrusion 132 is fixed to the inner wall of the mounting hole 6. When the first spring 133 is in its natural state, the protrusion 132 is adapted to the notch 137.

[0037] The unlocking component 14 is fixed on the adjusting shaft 11 and is configured to correspond one-to-one with the locking block 135. The unlocking component 14 includes an unlocking groove 141. In this embodiment, the unlocking component 14 includes two unlocking grooves 141. An electromagnet and a second spring 142 are fixedly connected to the bottom of the unlocking groove 141. The end of the second spring 142 away from the electromagnet is fixedly connected to the unlocking block 143. A magnet is fixedly connected to the side of the unlocking block 143 opposite to the electromagnet. The magnet has the opposite magnetism to the electromagnet when it is energized. When the electromagnet is de-energized, the top of the unlocking block 143 extends out of the unlocking groove 141.

[0038] When the water delivery component 8 is not in operation, the electromagnet is energized, and the unlocking block 143, under the magnetic force of the electromagnet, overcomes the elastic force of the second spring 142 and retracts into the unlocking groove 141, so that the unlocking block 143 will not contact the locking block 135 on the water delivery component 8. At this time, the locking block 135 on the water delivery component 8 is pushed to the protrusion 132 by the movable rod 134 under the action of the first spring 133, so that the notch 137 on the locking block 135 is adapted to the protrusion 132. At this time, the locking block 135 cannot rotate under the restriction of the protrusion 132. Since the movable rod 134 extends out of the insertion hole 131 and remains in the insertion hole 131, the locking block 135 cannot rotate, thus fixing the position of the movable rod 134, which in turn prevents the fixed shaft 82 from rotating, thereby locking the water delivery component 8 and preventing misalignment between the internal spline 10 in the shaft hole of the water delivery component 8 and the external spline 12 on the adjusting shaft 11.

[0039] When the water delivery component 8 needs to rotate for operation, the electromagnet is de-energized, and the unlocking block 143 extends partially out of the unlocking groove 141 under the action of the second spring 142. When the translational power device 16 drives the adjusting shaft 11 to move horizontally, the unlocking block 143 moves with the adjusting shaft 11. During the movement, the unlocking block 143 contacts the locking block 135 and pushes the locking block 135 towards the direction of the fixed shaft 82, so that the locking block 135 separates from the protrusion 132. After the locking block 135 separates from the protrusion 132, the water delivery component 8 can rotate under the drive of the adjusting shaft 11 to provide power for the delivery of liquid.

[0040] In use, the number of water delivery components 8 required is determined according to the head requirement. For example, if four water delivery components 8 need to rotate simultaneously for liquid transportation, the adjusting shaft 11 is moved a corresponding distance using the translational power device 16. Figure 3 As shown, the end of the adjusting shaft 11 passes through the central holes of the four water supply components 8, and the external spline 12 on the adjusting shaft 11 is connected to the internal spline 10 on the four water supply components 8. When the unlocking component 14 at the end just passes through the third water supply component 8, the controller controls all the electromagnets in the three unlocking components 14 at the end of the adjusting shaft 11 to be de-energized, so that the unlocking block 143 in the three unlocking components 14 extends out of the unlocking slot 141. As the unlocking block 143 moves with the adjusting shaft 11, it unlocks the corresponding... The locking blocks 135 on the three water delivery components 8 are pushed away from the protrusions 132, thereby unlocking the three water delivery components 8. At this time, the rotary power device is activated, which drives the fixed shaft 82 that passes through the pump housing 1 to rotate. After the fixed shaft 82 that passes through the pump housing 1 rotates, the water delivery components 8 that pass through the pump housing 1 rotate accordingly. The water delivery components 8 that pass through the pump housing 1 drive the adjusting shaft 11 to rotate, and the adjusting shaft 11 drives the other three water delivery components 8 connected to it to rotate, thereby enabling the four water delivery components 8 to rotate simultaneously to provide power for liquid delivery.

[0041] In a further preferred embodiment, the rotary drive device 2 includes a rotary drive motor 201, a drive gear 202, and a driven gear 203. The drive gear 202 is fixedly connected to the output shaft of the rotary drive motor 201, and the driven gear 203 is coaxially fixedly connected to the outer wall of the fixed shaft 82 that passes through the pump housing 1, and the driven gear 203 is meshed with the drive gear 202.

[0042] In use, the rotary drive motor 201 drives the drive gear 202 to rotate, the drive gear 202 drives the driven gear 203 to rotate, and the driven gear 203 drives the fixed shaft 82 that passes through the pump housing 1 to rotate, thereby realizing the rotation of the water delivery component 8 that passes through the pump housing 1.

[0043] In a further preferred embodiment, the rotary drive motor 201 is fixedly mounted on the drive base 15, and the drive base 15 is provided with a through hole through which the fixed shaft 82 of the pump housing 1 is rotatably connected.

[0044] In use, the drive base 15 can integrate the rotary drive motor 201 and the fixed shaft 82, so that the rotary drive motor 201 and the fixed shaft 82 vibrate at the same frequency, thereby ensuring the stability of the drive motor when transmitting power to the fixed shaft 82.

[0045] In a further preferred embodiment, the translational power device 16 includes a guide seat 161 with a guide groove 162. A threaded rod 163 is rotatably connected within the guide groove 162, and the threaded rod 163 is arranged parallel to the adjusting shaft 11. One end of the threaded rod 163 is connected to a translational drive motor 164, and a movable seat 165 is threadedly connected to the threaded rod 163. The movable seat 165 is slidably connected within the guide groove 162, rotatably connected to the adjusting shaft 11, and capable of driving the adjusting shaft 11 to reciprocate.

[0046] The top of the movable seat 165 is provided with a groove that is adapted to the structure of the adjusting shaft 11. The side of the groove away from the adjusting shaft 11 abuts against the outer end face of the adjusting shaft 11. The top of the movable seat 165 is also fixedly connected with a retaining ring 17. The retaining ring 17 includes an upper half and a lower half that are detachably connected. The lower half is fixedly connected to the movable seat 165. After the upper half and the lower half are connected, they are fitted onto the adjusting shaft 11. The side of the retaining ring 17 away from the fixed shaft 82 contacts and connects with the convex ring 18 fixedly connected to the curved side wall of the adjusting shaft 11.

[0047] In use, the translation drive motor 164 drives the threaded rod 163 to rotate, which in turn drives the movable seat 165 to move along the length of the threaded rod 163. The movement of the movable seat 165 drives the adjusting shaft 11 to move synchronously.

[0048] In a further optimized design, an outlet 19 and an inlet 20 are fixedly connected to the outer wall of the pump casing 1. The outlet 19 is connected to the outlet chamber 4, and the inlet 20 is connected to the pump chamber 3, which is away from the outlet chamber 4.

[0049] In use, the liquid enters one of the pump chambers 3 of the pump casing 1 from the inlet 20 under the action of the water supply component 8, and then enters other pump chambers 3 and the outlet chamber 4 in sequence through the water passage 7, and finally exits the pump casing 1 through the outlet 19.

[0050] In a further optimized design, a first sealing ring is fitted onto the fixed shaft 82 that extends out of the pump housing 1, and the first sealing ring is in contact with the outer wall of the pump housing 1.

[0051] In use, the first sealing ring can ensure the sealing between the fixed shaft 82 that passes through the pump housing 1 and the pump housing 1.

[0052] In a further preferred embodiment, a sealing cover 21 is slidably connected to the adjusting shaft 11, and a second sealing ring is fixedly connected inside the sealing cover 21. The center hole of the second sealing ring is slidably and sealingly connected to the adjusting shaft 11, and one end of the sealing cover 21 is threadedly connected to the outer end of the fixed shaft 82 that protrudes from the pump housing 1. After the sealing cover 21 is threadedly connected, the second sealing ring is in contact with the end face of the fixed shaft 82 that protrudes from the pump housing 1.

[0053] In order to increase the stability of the sealing cover 21 during use, the sealing cover 21 and the fixed shaft 82 that extends out of the pump housing 1 can be fixed by bolts. The second sealing ring is used to ensure the sealing between the adjusting shaft 11 and the fixed shaft 82 that extends out of the pump housing 1.

[0054] Therefore, the present invention provides a multi-stage centrifugal condensate pump with the above-described structure, which has a simple structure and allows for easy adjustment of its head as needed.

[0055] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0056] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A multi-stage centrifugal condensate pump, characterized in that: The pump housing includes a pump casing (1) and a rotary drive device (2). The pump casing (1) contains multiple pump chambers (3) evenly distributed along its length and a water outlet chamber (4). Adjacent pump chambers (3) and the water outlet chamber (4) adjacent to each other are separated by mounting plates (5). The mounting plates (5) have mounting holes (6) and several water passage holes (7). The pump casing (1) contains water delivery components (8) corresponding to the pump chambers (3). Each water delivery component (8) includes an impeller (81) and a fixed shaft (82) coaxially connected. 81) Located in the pump chamber (3), the fixed shaft (82) is rotatably connected in the mounting hole (6). The water delivery component (8) has an internal spline (10) in its shaft hole. An adjusting shaft (11) is slidably connected in the shaft hole. The adjusting shaft (11) is connected to the translational power device (16). The adjusting shaft (11) has an external spline (12) that corresponds to the water delivery component (8). The external spline (12) is structurally compatible with the internal spline (10). The fixed shaft (82) on the water delivery component (8) at the end passes through the pump housing (1) and is connected to the rotary drive device (2). A locking component (13) and an unlocking component (14) are provided between the fixed shaft (82) located entirely within the pump housing (1) and the mounting hole (6). The locking component (13) is used to prevent the water delivery component (8) from rotating within the mounting hole (6), and the unlocking component (14) is used to unlock the water delivery component (8) and restore its rotatability within the mounting hole (6). The locking assembly (13) includes a socket (131) and a protrusion (132). The socket (131) is symmetrically arranged on the end face of the fixed shaft (82). A first spring (133) is provided inside the socket (131) along the length direction of the socket (131). One end of the first spring (133) is fixedly connected to the inner wall of the socket (131), and the other end of the first spring (133) is fixedly connected to the movable rod (134). 134) The end away from the first spring (133) is connected to the locking block (135). The middle part of the locking block (135) is provided with a through hole (136) for the adjustment shaft (11) to pass through. The curved side wall of the locking block (135) is provided with a notch (137). The protrusion (132) is fixedly connected to the inner wall of the mounting hole (6). When the first spring (133) is in its natural state, the protrusion (132) is adapted to the notch (137). The translational power device (16) includes a guide seat (161), on which a guide groove (162) is provided. A threaded rod (163) is rotatably connected in the guide groove (162). The threaded rod (163) is arranged parallel to the adjusting shaft (11). One end of the threaded rod (163) is connected to a translational drive motor (164). A movable seat (165) is threadedly connected to the threaded rod (163). The movable seat (165) is slidably connected in the guide groove (162). The movable seat (165) is rotatably connected to the adjusting shaft (11), and the movable seat (165) can drive the adjusting shaft (11) to move back and forth.

2. The multi-stage centrifugal condensate pump according to claim 1, characterized in that: The unlocking component (14) is fixed on the adjusting shaft (11) and is set in a one-to-one correspondence with the locking block (135). The unlocking component (14) includes an unlocking groove (141). An electromagnet and a second spring (142) are fixedly connected to the bottom of the unlocking groove (141). The end of the second spring (142) away from the electromagnet is fixedly connected to the unlocking block (143). A magnet is fixedly connected to the side of the unlocking block (143) opposite to the electromagnet. The magnet has the opposite magnetism to the electromagnet when it is energized. When the electromagnet is de-energized, the top of the unlocking block (143) extends out of the unlocking groove (141).

3. The multi-stage centrifugal condensate pump according to claim 1, characterized in that: The rotary drive device (2) includes a rotary drive motor (201), a drive gear (202) and a driven gear (203). The drive gear (202) is fixedly connected to the output shaft of the rotary drive motor (201). The driven gear (203) is coaxially fixedly connected to the outer wall of the fixed shaft (82) that passes through the pump housing (1), and the driven gear (203) meshes with the drive gear (202).

4. The multi-stage centrifugal condensate pump according to claim 3, characterized in that: The rotary drive motor (201) is fixedly mounted on the drive seat (15), and the drive seat (15) is provided with a through hole, through which the fixed shaft (82) passing through the pump housing (1) is rotatably connected.

5. The multi-stage centrifugal condensate pump according to claim 1, characterized in that: The pump casing (1) has an outlet (19) and an inlet (20) fixedly connected to its outer wall. The outlet (19) is connected to the outlet chamber (4), and the inlet (20) is connected to the pump chamber (3) which is away from the outlet chamber (4).

6. The multi-stage centrifugal condensate pump according to claim 1, characterized in that: A first sealing ring is fitted on the fixed shaft (82) that extends out of the pump housing (1), and the first sealing ring is in contact with the outer wall of the pump housing (1).

7. The multi-stage centrifugal condensate pump according to claim 1, characterized in that: A sealing cover (21) is slidably connected to the adjusting shaft (11). A second sealing ring is fixedly connected inside the sealing cover (21). The center hole of the second sealing ring is slidably sealed to the adjusting shaft (11). One end of the sealing cover (21) is threadedly connected to the outer side end of the fixed shaft (82) that passes through the pump housing (1). After the sealing cover (21) is threadedly connected, the second sealing ring is in contact with the end face of the fixed shaft (82) that passes through the pump housing (1).

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