Centrifugal pump with adjustable guide vane

Abstract

The invention relates to the technical field of centrifugal pumps, and particularly discloses a guide vane adjustable centrifugal pump which comprises a centrifugal pump body, the centrifugal pump body comprises a water inlet pipe and a water outlet pipe, the water inlet pipe is used for water inlet, the water outlet pipe is used for water outlet, and a flow stopping assembly is installed on the end face of the water outlet pipe and used for preventing water from flowing back into the centrifugal pump body. A connecting pipe is installed at the top of the flow stopping assembly, a flange is installed on the top face of the connecting pipe, and a protection assembly is installed between the connecting pipe and the flow stopping assembly and used for protecting small parts in the flow stopping assembly. According to the guide vane adjustable centrifugal pump, the flow stopping assembly is arranged in the guide vane adjustable centrifugal pump, when the device is used, through mutual cooperation of the structures, normal water outlet can be achieved when the device is used, the water outlet pipe can be closed in time when the device stops being used, and the effect that installation water is prevented from flowing back into the centrifugal pump body is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal pumps, and in particular relates to a centrifugal pump with adjustable guide vanes. Background Art

[0002] The centrifugal pump with adjustable guide vanes is a centrifugal pump that changes the outlet pressure and head by adjusting the guide vane angle. Under the premise of constant impeller speed and flow rate, the size of the outlet can be controlled by rotating the guide vanes, thereby changing the outlet pressure of the centrifugal pump. Since the head size is related to pressure, controlling the outlet pressure can control the head size.

[0003] The existing Chinese invention patent is a centrifugal pump with adjustable guide vanes (Announcement No.: CN114483642B), which includes a pump body and an impeller. A pump cavity is provided in the pump body, and the impeller is installed in the pump cavity. A plurality of guide vanes are provided along the circumferential direction on the circumference of the impeller. The guide vanes are rotatably installed on the pump body and the rotation axis is parallel to the rotation axis of the impeller. The ends of adjacent guide vanes are formed with obliquely arranged water outlets. The present application can control the size of the water outlet by rotating the guide vanes, adjust the pressure of the outlet water, and thus adjust the head of the centrifugal pump. There is no need to cut the outer diameter of the impeller or set up multiple models of centrifugal pumps to meet the use requirements of the head, which can effectively reduce the production cost.

[0004] In the prior art, when a centrifugal pump suddenly stops running, if the outlet valve is not closed in time, the liquid in the pipeline will continue to flow due to inertia and cause backflow, which may cause the impeller of the pump to loosen or even fall off under the action of the reverse force;

[0005] Therefore, this solution proposes a centrifugal pump with adjustable guide vanes to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a centrifugal pump with adjustable guide vanes to solve the problem in the prior art that when the centrifugal pump suddenly stops running, if the outlet valve is not closed in time, the liquid in the pipeline will continue to flow due to inertia and produce backflow, which may cause the impeller of the pump to loosen or even fall off under the action of the reverse force.

[0007] To achieve the above object, the present invention provides the following technical solutions: a centrifugal pump with adjustable guide vanes, comprising a centrifugal pump body, the centrifugal pump body comprising a water inlet pipe and a water outlet pipe, the water inlet pipe is used for water inlet, the water outlet pipe is used for water outlet, a flow stop assembly is installed on the end surface of the water outlet pipe, the flow stop assembly is used to prevent water from flowing back into the centrifugal pump body, a connecting pipe is installed on the top of the flow stop assembly, a flange is installed on the top surface of the connecting pipe, a protective assembly is installed between the connecting pipe and the flow stop assembly, the protective assembly is used to protect small parts in the flow stop assembly;

[0008] Among them, the centrifugal pump in this scheme is specifically a centrifugal pump with adjustable guide vanes, and its structure and working principle are the same as those in the existing Chinese invention patent for a centrifugal pump with adjustable guide vanes (Announcement No.: CN114483642B), and will not be described in detail here;

[0009] The flow-stop assembly comprises a mounting pipe, a mounting frame, a circular plate and a transmission plate;

[0010] A plurality of rotating shafts 1 are rotatably mounted on the side wall of the mounting frame, and the rotating shafts 1 penetrate the mounting tube and extend to the outside of the mounting tube. Fixed rings are respectively mounted on both sides of the outer wall of the rotating shaft 1, and a transmission block is mounted below the side wall of the fixed ring, and a rotating shaft 2 is rotatably mounted on the transmission block;

[0011] The transmission plate is rotatably mounted with a plurality of rotating shafts 2;

[0012] The rotating shaft is located on the outer wall of the inner cavity of the mounting frame and a closing plate is installed;

[0013] Torsion springs are sleeved on both sides of an outer wall of the rotating shaft located in the middle position, one end of the torsion spring is connected to a fixing ring, and the other end of the torsion spring is connected to the outer wall of the mounting tube;

[0014] The torsion spring is used to drive the rotating shaft that is flipped under the impact of the water flow to reset.

[0015] As a preferred solution of the present invention, a circular plate is installed in the inner cavity of the installation tube, a connecting groove is opened in the circular plate, and a mounting frame is installed in the inner cavity of the connecting groove.

[0016] As a preferred solution of the present invention, a transfer pipe is installed on the top surface of the water outlet pipe, a mounting pipe is installed above the inner cavity of the transfer pipe, and a connecting pipe is installed above the outer wall of the mounting pipe.

[0017] As a preferred solution of the present invention, the left side of the closing plate is inwardly concave and has an arc-shaped design, the right side of the closing plate is outwardly protruding and has an arc-shaped design, and the adjacent closing plates are closed to each other;

[0018] The arc-shaped parts between adjacent closing plates are complementary and fit each other, thereby preventing the backflow water from penetrating into the centrifugal pump body.

[0019] As a preferred solution of the present invention, a protection component is installed between the outer wall connecting pipes of the transfer pipe, and the protection component includes a mounting ring 1 and a mounting ring 3. The mounting ring 3 is installed on the outer wall of the transfer pipe;

[0020] The second mounting ring is made of an iron-cobalt-nickel alloy, which facilitates the adsorption of the second mounting ring by the annular magnet;

[0021] Furthermore, the bellows has good expansion and contraction performance, and can retain good practicality even after repeated pulling. At the same time, the bellows is made of plastic and has good waterproof performance, which can avoid contact between water flow and torsion spring, reduce the possibility of torsion spring rust and reduce service life.

[0022] As a preferred solution of the present invention, a mounting ring 1 is installed on the outer wall of the connecting pipe, a bellows is installed on the bottom surface of the mounting ring 1, and a mounting ring 2 is installed on the bottom surface of the bellows.

[0023] As a preferred solution of the present invention, a mounting groove is provided on the top surface of the mounting ring three, an annular magnet is installed in the inner cavity of the mounting groove, and the annular magnet magnetically attracts the mounting ring two.

[0024] As a preferred solution of the present invention, the perpendicular midline of the second mounting ring coincides with the perpendicular midline of the third mounting ring, and the ring diameters of the second mounting ring and the third mounting ring are equal.

[0025] As a preferred solution of the present invention, a plurality of installation limit blocks are evenly arranged on the front and rear sides of the inner cavity of the installation frame, and the bottom surface of the closing plate contacts two limit blocks.

[0026] As a preferred solution of the present invention, the ratio between the long distance and the short distance from the closing plate to the rotation axis is greater than two;

[0027] Among them, the ratio design between the long distance and the short distance from the closing plate to the rotating axis makes it possible for the closing plate, when impacted by water flow from below, to receive a greater impact force at a portion of the closing plate with a longer distance from the rotating axis than at a portion of the closing plate with a shorter distance from the rotating axis. At this time, the portion of the closing plate with a longer distance from the rotating axis will flip upward, allowing water flow to flow in the installation frame.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention provides a flow-stop assembly in a centrifugal pump with adjustable guide vanes. When the device is in use, the above structures cooperate with each other to achieve the effect of the device being able to discharge water normally when the device is in use, and the water outlet pipe being able to be closed in time when the device stops being used, thereby preventing the installation water from flowing back into the centrifugal pump body. This solves the problem in the prior art that when the centrifugal pump suddenly stops running, if the outlet valve is not closed in time, the liquid in the pipeline will continue to flow due to inertia and produce a backflow phenomenon, which may cause the impeller of the pump to loosen or even fall off under the action of the reverse force.

[0030] 2. The present invention provides a limit block in the installation frame to support the closing plate through the limit block when the device is in use, thereby avoiding the closing time of the closing plate and excessive rotation under the dual forces of the backflow water impact and the torsion spring, thereby achieving the effect of improving the overall sealing performance of the flow-stop assembly against backflow water.

[0031] 3. The present invention arranges a protective component between the flow-stop component and the connecting pipe. When the device is in use, the exposed external parts of the flow-stop component are protected by the mutual cooperation between the structures in the above components, thereby achieving the effect of increasing the service life of the flow-stop component. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A perspective view of the present invention;

[0033] Figure 2 is a side view of the present invention;

[0034] Figure 3 This is an installation diagram of the flow-stop assembly of the present invention;

[0035] Figure 4 It is a detailed diagram of the flow-stopping assembly of the present invention;

[0036] Figure 5 It is a relevant structural diagram of the flow-stopping assembly of the present invention;

[0037] Figure 6 An exploded view of the flow-stop assembly of the present invention;

[0038] Figure 7 It is a cross-sectional view of the installation frame of the present invention;

[0039] Figure 8 This is an exploded view of the protective component of the present invention;

[0040] Fig. 9 This is the installation diagram of the limit block.

[0041] In the figure: 1. centrifugal pump body; 2. water inlet pipe; 3. water outlet pipe; 4. protective assembly; 401. mounting ring 1; 402. bellows; 403. mounting ring 2; 404. annular magnet; 405. mounting ring 3; 406. mounting groove; 5. connecting pipe; 6. flange; 7. stop assembly; 701. mounting pipe; 702. rotating shaft 1; 703. fixing ring; 704. transmission block; 705. transmission plate; 706. rotating shaft 2; 707. torsion spring; 708. transfer pipe; 709. round plate; 7010. connecting groove; 7011. mounting frame; 7012. closing plate; 8. limit block. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Reference Figure 1 - Fig. 9 As shown, the present invention provides a centrifugal pump with adjustable guide vanes, including a centrifugal pump body 1, the centrifugal pump body 1 including a water inlet pipe 2 and a water outlet pipe 3, the water inlet pipe 2 is used for water inlet, the water outlet pipe 3 is used for water outlet, a flow stop assembly 7 is installed on the end surface of the water outlet pipe 3, the flow stop assembly 7 is used to prevent water from flowing back into the centrifugal pump body 1, a connecting pipe 5 is installed on the top of the flow stop assembly 7, a flange 6 is installed on the top surface of the connecting pipe 5, a protective assembly 4 is installed between the connecting pipe 5 and the flow stop assembly 7, and the protective assembly 4 is used to protect small parts in the flow stop assembly 7;

[0044] Among them, the centrifugal pump in this scheme is specifically a centrifugal pump with adjustable guide vanes, and its structure and working principle are the same as those in the existing Chinese invention patent for a centrifugal pump with adjustable guide vanes (Announcement No.: CN114483642B), and will not be described in detail here;

[0045] The flow stop assembly 7 includes a mounting tube 701, a mounting frame 7011, a circular plate 709 and a transmission plate 705;

[0046] A plurality of rotating shafts 702 are rotatably mounted on the side wall of the mounting frame 7011. The rotating shafts 702 penetrate the mounting tube 701 and extend to the outside of the mounting tube 701. Fixed rings 703 are respectively mounted on both sides of the outer wall of the rotating shaft 702. A transmission block 704 is mounted below the side wall of the fixed ring 703. A rotating shaft 2 706 is rotatably mounted on the transmission block 704.

[0047] A plurality of rotating shafts 706 are rotatably mounted on the transmission plate 705;

[0048] The rotating shaft 1 702 is located on the outer wall of the inner cavity of the installation frame 7011 and a closing plate 7012 is installed;

[0049] Torsion springs 707 are sleeved on both sides of the outer wall of the rotating shaft 1 702 located in the middle position, one end of the torsion spring 707 is connected to the fixing ring 703, and the other end of the torsion spring 707 is connected to the outer wall of the mounting tube 701;

[0050] The torsion spring 707 is used to drive the rotating shaft 1 702 that is turned over under the impact of the water flow to reset;

[0051] A circular plate 709 is installed in the inner cavity of the installation tube 701, a connecting groove 7010 is opened in the circular plate 709, and a mounting frame 7011 is installed in the inner cavity of the connecting groove 7010;

[0052] A transfer pipe 708 is installed on the top surface of the water outlet pipe 3, a mounting pipe 701 is installed above the inner cavity of the transfer pipe 708, and a connecting pipe 5 is installed above the outer wall of the mounting pipe 701;

[0053] The left side of the closing plate 7012 is inwardly concave and has an arc-shaped design, and the right side of the closing plate 7012 is outwardly protruding and has an arc-shaped design, and adjacent closing plates 7012 are closed to each other;

[0054] The arc-shaped parts of adjacent sealing plates 7012 are complementary and fit each other, thereby preventing the backflow water from penetrating into the centrifugal pump body 1;

[0055] The ratio between the long distance and the short distance from the closing plate 7012 to the rotation axis 1 702 is greater than two;

[0056] The ratio between the long distance and the short distance between the closing plate 7012 and the rotating shaft 1 702 is designed so that when the closing plate 7012 is impacted by water flow from below, the impact force on the portion of the closing plate 7012 with a longer distance from the rotating shaft 1 702 will be greater than that on the portion of the closing plate 7012 with a shorter distance from the rotating shaft 1 702. At this time, the portion of the closing plate 7012 with a longer distance from the rotating shaft 1 702 will flip upward, so that the water flow can flow in the installation frame 7011.

[0057] In this embodiment, when the device is pumping water, water flows in through the water inlet pipe 2 and flows out through the water outlet pipe 3 under the action of the centrifugal pump body 1. At this time, under the impact of the water flow sprayed out of the water outlet pipe 3, the closing plate 7012 will overcome the force of the torsion spring 707, and the longer part from the edge of the closing plate 7012 to the rotating shaft 1 702 will flip upward, thereby opening the inner cavity of the installation frame 7011, so that the water flow sprayed out of the centrifugal pump body 1 through the water outlet pipe 3 can pass through the flow stop assembly 7 normally, and finally be transported by the connecting pipe 5;

[0058] When the centrifugal pump body 1 needs to be closed after working for a period of time, as the centrifugal pump body 1 is closed, the water flow entering the centrifugal pump body 1 through the water inlet pipe 2 will no longer be able to be transported, and the closing plate 7012 will lose the impact of the water flow. At this time, under the action of the torsion spring 707, the rotating shaft 1 702 will be reset. At the same time, under the action of the fixing ring 703, the transmission block 704 and the transmission plate 705, all the rotating shafts 1 702 will drive the closing plate 7012 to quickly reset, thereby closing the installation frame 7011 to prevent water from flowing back into the centrifugal pump body 1.

[0059] In a further embodiment, referring to Figure 1 , Figure 2 and Figure 8 A protection assembly 4 is installed between the outer wall connecting pipe 5 of transfer pipe 708, and the protection assembly 4 includes a mounting ring 1 401 and a mounting ring 3 405. The mounting ring 3 405 is installed on the outer wall of transfer pipe 708;

[0060] A mounting ring 1 401 is mounted on the outer wall of the connecting pipe 5, a bellows 402 is mounted on the bottom surface of the mounting ring 1 401, and a mounting ring 2 403 is mounted on the bottom surface of the bellows 402;

[0061] Among them, the bellows 402 has good expansion and contraction performance and can retain good practicality even after repeated pulling. At the same time, the bellows 402 is made of plastic and has good waterproof performance, which can avoid contact between water flow and torsion spring 707 and reduce the possibility of rusting of torsion spring 707 and reducing service life.

[0062] The top surface of the mounting ring 405 is provided with a mounting groove 406, and an annular magnet 404 is installed in the inner cavity of the mounting groove 406, and the annular magnet 404 magnetically attracts the mounting ring 403;

[0063] The second mounting ring 403 is made of an iron-cobalt-nickel alloy, which facilitates the adsorption of the second mounting ring 403 by the annular magnet 404;

[0064] The mid-perpendicular line of the second mounting ring 403 coincides with the mid-perpendicular line of the third mounting ring 405, and the ring diameters of the second mounting ring 403 and the third mounting ring 405 are equal;

[0065] In this embodiment, when the device is in use, the mounting ring 2 403 is pulled to drive the mounting ring 2 403 to contact the annular magnet 404 on the mounting ring 3 405, so that the mounting ring 2 403 and the annular magnet 404 are adsorbed, and the flow-stop component 7 is wrapped in the bellows 402, thereby protecting the exposed external parts of the flow-stop component 7, preventing the exposed parts of the flow-stop component 7 from contacting water and being corroded, thereby achieving the effect of increasing the service life of the flow-stop component 7.

[0066] In a further embodiment, referring to Figure 1 - Fig. 9 , a plurality of installation limit blocks 8 are evenly arranged on the front and rear sides of the inner cavity of the installation frame 7011, and the bottom surface of the closing plate 7012 contacts two limit blocks 8;

[0067] In this embodiment, when the device stops running, the closing plate 7012 flips and resets. At this time, the limit block 8 will limit the closing plate 7012 to prevent the closing plate 7012 from flipping over and causing the problem of being unable to block the backflow water.

[0068] The working principle of this scheme is as follows: when the device is pumping water, water flows in from the water inlet pipe 2, and flows out from the water outlet pipe 3 under the action of the centrifugal pump body 1. At this time, under the impact of the water flow sprayed out from the water outlet pipe 3, the closing plate 7012 will overcome the force of the torsion spring 707, and the longer part of the closing plate 7012 from the edge to the rotating shaft 702 will flip upward, thereby opening the inner cavity of the installation frame 7011, so that the water flow sprayed out from the centrifugal pump body 1 through the water outlet pipe 3 can pass through the stopper assembly 7 normally, and finally be transported by the connecting pipe 5. When the centrifugal pump body 1 needs to be closed after a period of time, as the centrifugal pump body 1 is closed, the water flow entering the centrifugal pump body 1 through the water inlet pipe 2 will no longer be able to continue to be transported, and the closing plate 7012 will lose the impact of the water flow. At this time, under the action of the torsion spring 707, the rotating shaft 1 702 will be reset. At the same time, under the action of the fixing ring 703, the transmission block 704 and the transmission plate 705, all the rotating shafts 1 702 will drive the closing plate 7012 to quickly reset, thereby closing the installation frame 7011 to prevent water from flowing back into the centrifugal pump body 1.

[0069] When the device stops running, the closing plate 7012 flips over and resets. At this time, the limit block 8 will limit the closing plate 7012 to prevent the closing plate 7012 from flipping over excessively, resulting in the problem of being unable to block the backflow water.

[0070] When the device is in use, the mounting ring 2 403 is pulled to drive the mounting ring 2 403 to contact the annular magnet 404 on the mounting ring 3 405, so that the mounting ring 2 403 and the annular magnet 404 are adsorbed, and the flow-stop component 7 is wrapped in the bellows 402, thereby protecting the exposed external parts of the flow-stop component 7, preventing the exposed parts of the flow-stop component 7 from contacting water and being corroded, thereby achieving the effect of increasing the service life of the flow-stop component 7.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump with adjustable guide vanes, comprising a centrifugal pump body (1), characterized in that: The centrifugal pump body (1) comprises a water inlet pipe (2) and a water outlet pipe (3), the water inlet pipe (2) is used for water inlet, the water outlet pipe (3) is used for water outlet, a flow stop assembly (7) is installed on the end surface of the water outlet pipe (3), the flow stop assembly (7) is used to prevent water from flowing back into the centrifugal pump body (1), a connecting pipe (5) is installed on the top of the flow stop assembly (7), a flange (6) is installed on the top surface of the connecting pipe (5), a protective assembly (4) is installed between the connecting pipe (5) and the flow stop assembly (7), and the protective assembly (4) is used to protect small parts in the flow stop assembly (7); The flow-stopping assembly (7) comprises a mounting tube (701), a mounting frame (7011), a circular plate (709) and a transmission plate (705); A plurality of rotating shafts (702) are rotatably mounted on the side wall of the mounting frame (7011), the rotating shafts (702) penetrate the mounting tube (701) and extend to the outside of the mounting tube (701), fixed rings (703) are respectively mounted on both sides of the outer wall of the rotating shaft (702), a transmission block (704) is mounted below the side wall of the fixed ring (703), and a rotating shaft (706) is rotatably mounted on the transmission block (704); A plurality of rotating shafts (706) are rotatably mounted on the transmission plate (705); The rotating shaft 1 (702) is located on the outer wall of the inner cavity of the installation frame (7011) and a closing plate (7012) is installed; Torsion springs (707) are respectively sleeved on both sides of the outer wall of the rotating shaft (702) located in the middle position, one end of the torsion spring (707) is connected to a fixing ring (703), and the other end of the torsion spring (707) is connected to the outer wall of the mounting tube (701).

2. A centrifugal pump with adjustable guide vanes according to claim 1, characterized in that: A circular plate (709) is installed in the inner cavity of the installation tube (701), a connecting groove (7010) is opened in the circular plate (709), and a mounting frame (7011) is installed in the inner cavity of the connecting groove (7010).

3. The centrifugal pump with adjustable guide vanes according to claim 1, characterized in that: A transfer pipe (708) is installed on the top surface of the water outlet pipe (3), a mounting pipe (701) is installed above the inner cavity of the transfer pipe (708), and a connecting pipe (5) is installed above the outer wall of the mounting pipe (701).

4. The centrifugal pump with adjustable guide vanes according to claim 1, characterized in that: The left side of the closing plate (7012) is inwardly concave and has an arc-shaped design, and the right side of the closing plate (7012) is outwardly protruding and has an arc-shaped design, and adjacent closing plates (7012) are closed to each other.

5. The centrifugal pump with adjustable guide vanes according to claim 3, characterized in that: A protection component (4) is installed between the outer wall connecting pipe (5) of the transfer pipe (708), and the protection component (4) comprises a mounting ring 1 (401) and a mounting ring 3 (405). The mounting ring 3 (405) is installed on the outer wall of the transfer pipe (708).

6. The centrifugal pump with adjustable guide vanes according to claim 5, characterized in that: A mounting ring 1 (401) is installed on the outer wall of the connecting pipe (5), a bellows (402) is installed on the bottom surface of the mounting ring 1 (401), and a mounting ring 2 (403) is installed on the bottom surface of the bellows (402).

7. The centrifugal pump with adjustable guide vanes according to claim 5, characterized in that: The top surface of the third mounting ring (405) is provided with a mounting groove (406), an annular magnet (404) is installed in the inner cavity of the mounting groove (406), and the mounting ring (403) is magnetically attracted to the annular magnet (404).

8. The centrifugal pump with adjustable guide vanes according to claim 7, characterized in that: The mid-perpendicular line of the second mounting ring (403) and the mid-perpendicular line of the third mounting ring (405) coincide with each other, and the ring diameters of the second mounting ring (403) and the third mounting ring (405) are equal.

9. The centrifugal pump with adjustable guide vanes according to claim 1, characterized in that: A plurality of installation limit blocks (8) are evenly arranged on the front and rear sides of the inner cavity of the installation frame (7011), and the bottom surface of the closing plate (7012) contacts two limit blocks (8).

10. The centrifugal pump with adjustable guide vanes according to claim 1, characterized in that: The ratio between the long distance and the short distance from the closing plate (7012) to the rotation axis 1 (702) is greater than two.

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