Vertical centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a vertical centrifugal pump which comprises a pump shell, an impeller, a pump shaft and a driving motor, a water pumping opening is formed between the pump shell and the driving motor, a water outlet is formed in the end, away from the driving motor, of the pump shell, and a water guide plate is arranged between the pump shell and the driving motor. The water guide plate is used for guiding water into an inlet of the impeller, and the impeller is in running fit with the water guide plate. According to the centrifugal pump, water at the water pumping opening of the centrifugal pump is directly guided to the inlet of the impeller through the water guide plate, so that the problem that the water is accumulated in a gap between the outer wall of the impeller and the inner wall of the pump shell is solved, and the performance of the centrifugal pump is indirectly improved.

Description

Technical Field

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

[0002] A centrifugal pump works by using the rotation of the impeller to cause water to move centrifugally. Before starting the pump, the pump casing and the suction pipe must be filled with water. Then the motor is started, causing the pump shaft to drive the impeller and water to rotate at high speed. The water moves centrifugally and is thrown to the edge of the impeller, flowing into the water pressure pipeline of the pump through the flow channel of the volute pump casing.

[0003] Existing centrifugal pumps generally consist of a pump casing, impeller, pump shaft, shaft seal, sealing packing, and drive motor. The impeller rotates within the pump casing, and its outlet connects to the water guide groove between the guide vanes within the pump casing. The impeller's structure directly affects the pump's flow rate and head, which in turn directly impacts its performance. Generally speaking, high-flow impellers have wider inlets and narrower outlets, while high-head impellers have narrower inlets and wider outlets. For high-head centrifugal pumps, the narrow impeller inlet inevitably creates a gap between the outer wall of the impeller inlet and the inner wall of the pump casing during installation.

[0004] In actual use, when water enters the centrifugal pump from the water inlet, it is easy to accumulate in the above-mentioned gap in the process of flowing to the impeller inlet, thereby indirectly affecting the overall pumping efficiency of the centrifugal pump. Especially when the above-mentioned gap is large, the inner wall of the gap will also hinder the flow of water, which is more likely to affect the suction of water at the impeller inlet, and thus affect the pumping performance of the centrifugal pump. Utility Model Content

[0005] In order to reduce the impact of the gap between the outer wall of the impeller inlet end and the inner wall of the pump casing on the pumping performance of the centrifugal pump while ensuring the normal operation of the water pump, the present application provides a vertical centrifugal pump.

[0006] This application provides a vertical centrifugal pump, which adopts the following technical solution:

[0007] A vertical centrifugal pump includes a pump casing, an impeller, a pump shaft and a drive motor. A water suction port is formed between the pump casing and the drive motor. A water outlet is opened at one end of the pump casing away from the drive motor. A water guide plate is provided between the pump casing and the drive motor. The water guide plate is used to guide water into the inlet of the impeller. The impeller rotates in conjunction with the water guide plate.

[0008] By adopting the above technical solution, when in use, the water at the water suction port is guided to the inlet of the impeller through the water guide plate, thereby reducing the accumulation of water in the gap between the inner wall of the pump casing and the outer wall of the impeller during the pumping process, thereby reducing the impact of this gap on the pumping performance of the centrifugal pump, thereby ensuring the use effect of the centrifugal pump and making it more convenient to use.

[0009] Preferably, the impeller includes an inner casing, an outer casing, and blades arranged between the inner casing and the outer casing, the inner casing is coaxially sleeved on the pump shaft, one end of the blade is fixed to the inner casing, and the other end of the blade is fixed to the outer casing, and a water guide cavity is formed between the outer casing, the blades and the inner casing, and the water guide cavity is communicated with the water outlet of the pump casing, the outer casing is rotatably connected to the water guide plate, the inner casing is rotatably connected to the pump casing, a cavity is formed between the outer casing and the pump casing, the water guide plate is sealed at the cavity mouth, and the pump shaft is also provided with a first clamping structure for preventing the inner casing from separating from the pump shaft.

[0010] By adopting the above technical solution, when in use, the first clamping structure, the inner wall of the pump casing and the water guide plate are coordinated to form a limit for the impeller, thereby ensuring the rotation stability of the impeller while also ensuring the centrifugal force of the impeller on the water, thereby ensuring the performance of the centrifugal pump.

[0011] Preferably, the first clamping structure includes an abutting sleeve threadedly connected to the end of the pump shaft, and one end of the abutting sleeve is in abutment with the inner shell.

[0012] By adopting the above technical solution, when in use, the impeller can be installed on the pump shaft by screwing the abutment sleeve so that the abutment sleeve abuts against the inner casing, and the installation process is simple and convenient.

[0013] Preferably, a connecting ring is provided on the driving motor, and a plurality of connecting rods are provided between the connecting ring and the driving motor. The connecting rods are evenly distributed along the circumference of the connecting ring, and one end of the connecting rod is fixed to the outer wall of the driving motor, and the other end of the connecting rod is fixedly connected to the connecting ring. The water suction port is provided between two adjacent connecting rods, the pump casing is located on the connecting ring, and the water guide plate is located between the connecting ring and the pump casing. The connecting ring is provided with a second clamping structure for fixedly connecting itself to the water guide plate and the pump casing.

[0014] By adopting the above technical solution, when in use, the connecting ring, the water guide plate and the pump casing are fixedly connected together through the second clamping structure, thereby realizing the installation of the water guide plate, and the overall use is simple and convenient.

[0015] Preferably, the second clamping structure includes a locking bolt arranged on the connecting ring, a first mounting hole is provided on the connecting ring, a second mounting hole is provided on the water guide plate, and a mounting groove is provided on the pump casing, and one end of the locking bolt passes through the first mounting hole and the second mounting hole in sequence and is threadedly connected in the mounting groove.

[0016] By adopting the above technical solution, when in use, the water guide plate can be fixed by passing the locking bolt through the first mounting hole and the second mounting hole and then threading it into the mounting groove. At the same time, the openings of the first mounting hole, the second mounting hole and the mounting groove are all facing the water outlet, which reduces the situation where water accumulation in the mounting groove is likely to occur.

[0017] Preferably, a first weight-reducing groove is provided on the water guide plate, and a second weight-reducing groove is provided on the pump housing.

[0018] By adopting the above technical solution, when in use, the overall weight of the centrifugal pump is reduced by the provision of the first weight-reducing groove and the second weight-reducing groove, thereby making the entire centrifugal pump easier to transport and carry.

[0019] Preferably, a first sealing ring is provided between the water guide plate and the outer wall of the impeller inlet, and a second sealing ring is provided between the outer wall of the impeller outlet and the inner wall of the pump casing.

[0020] By adopting the above technical solution, when in use, the first sealing ring is set to seal the connection gap between the water guide plate and the outer wall of the impeller inlet, and the second sealing ring is used to seal the connection gap between the outer wall of the impeller outlet and the inner wall of the pump casing, thereby further ensuring the flow direction of water in the impeller and the pump casing, which is more conducive to ensuring the performance of the centrifugal pump.

[0021] Preferably, a drain outlet is provided on one side of the water guide plate, the drain outlet connects the water pumping port with the cavity, and a guide convex ring is provided at the opening of the drain outlet facing the water pumping port.

[0022] By adopting the above technical solution, when in use, after water flows into the cavity from the gap between the outer shell and the inner wall of the pump casing, the water in the cavity can be discharged back into the water suction port through the setting of the drain port, thereby reducing the accumulation of water in the cavity; at the same time, under the action of the guide convex ring, the water at the water suction port is further guided, thereby reducing the occurrence of water entering the cavity from the drain port.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The locking bolts are used to connect the water guide plate, the connecting ring, and the pump casing. This allows the water at the suction port to be directed to the impeller inlet via the water guide plate, thereby reducing water accumulation in the cavity between the outer wall of the impeller and the inner wall of the pump casing, thereby ensuring the performance of the centrifugal pump.

[0025] 2. The first and second weight-reducing grooves are provided to reduce the overall weight of the centrifugal pump while ensuring the performance of the centrifugal pump. At the same time, the first and second sealing rings are used to seal the gap at the connection of the impeller, thereby ensuring the flow direction of water and further ensuring the performance of the centrifugal pump.

[0026] 3. Through the setting of the drain port and the guide convex ring, on the one hand, the water in the cavity is discharged to reduce the accumulation of water in the cavity; on the other hand, the backflow of water from the drain port into the cavity is reduced, thereby ensuring the performance of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an axonometric diagram mainly showing the overall structure in Example 1 of the present application;

[0028] Figure 2 This is a cross-sectional view mainly showing the overall structure of Example 1 of the present application;

[0029] Figure 3 This is an exploded view of the overall structure of Example 1 of the present application;

[0030] Figure 4 This is a cross-sectional view mainly showing the overall structure of Example 2 of the present application;

[0031] Figure 5 This is a cross-sectional view mainly showing the overall structure of Example 3 of the present application;

[0032] Figure 6 This is a cross-sectional view mainly showing the overall structure of the fourth embodiment of the present application;

[0033] Figure 7 It is an axonometric diagram mainly showing the structure of the water guide plate in the fourth embodiment of the present application.

[0034] Figure markings: 1. Pump casing; 11. Mounting groove; 12. Second weight-reducing groove; 2. Impeller; 21. Inner casing; 22. Outer casing; 23. Blades; 24. Cavity; 3. Pump shaft; 31. Connecting column; 4. Drive motor; 5. Water suction port; 6. Water outlet; 7. Water guide plate; 71. Second mounting hole; 72. First weight-reducing groove; 73. Drain port; 74. Guide ring; 8. First clamping structure; 81. Abutting sleeve; 9. Connecting ring; 91. First mounting hole; 10. Connecting rod; 20. Second clamping structure; 201. Locking bolt; 30. First sealing ring; 40. Second sealing ring. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 -Attached Figure 7This application is described in further detail.

[0036] The embodiment of the present application discloses a vertical centrifugal pump.

[0037] Example 1:

[0038] Reference Figure 1 and Figure 2 In actual working conditions, the performance of a centrifugal pump is closely related to the power, head, and flow rate of the drive motor 4. The head and flow rate are in turn related to the size of the impeller 2, the inner cavity size of the pump casing 1, and the shape of the guide vanes. Therefore, when the power of the drive motor 4 remains unchanged, the shape of the pump casing 1 or the size of the impeller 2 on centrifugal pumps with different heads or flow rates will also be different. In this embodiment, a centrifugal pump with a drive motor 4 of 30 kW, a head of 50, and a flow rate of 150 is used as an example for description.

[0039] Reference Figure 1 and Figure 2 A vertical centrifugal pump includes a pump casing 1, an impeller 2, a pump shaft 3 and a drive motor 4, wherein the drive motor 4 is placed horizontally as a whole, and a connecting ring 9 is provided on the drive motor 4. The connecting ring 9 and the drive motor 4 are coaxially arranged, and a plurality of connecting rods 10 are provided between the connecting ring 9 and the top of the drive motor 4. The plurality of connecting rods 10 are evenly distributed on the circumference of the drive motor 4. In this embodiment, three connecting rods 10 are preferably provided, and the bottom ends of the connecting rods 10 are welded and fixed to the outer side wall of the drive motor 4, and the top ends of the connecting rods 10 are welded and fixed to the connecting ring 9, and a water suction port 5 is formed between two adjacent connecting rods 10.

[0040] Reference Figure 2 and Figure 3 The pump casing 1 is located above the connecting ring 9, one end of the pump shaft 3 is coaxially fixedly connected to the output shaft of the drive motor 4, and the other end of the pump shaft 3 extends into the pump casing 1. The impeller 2 is coaxially fixedly connected to the pump shaft 3, and the impeller 2 rotates as a whole in the pump casing 1. The impeller 2 is composed of an inner casing 21, an outer casing 22 and a plurality of blades 23. The inner casing 21 is coaxially sleeved on the top of the pump shaft 3, and the outer casing 22 is sleeved on the inner casing 21. The plurality of blades 23 are located between the inner casing 21 and the outer casing 22, and the plurality of blades 23 are evenly distributed along the circumference of the inner casing 21. One end of the blade 23 is welded to the inner casing 21, and the other end of the blade 23 is welded to the side wall of the outer casing 22.

[0041] Reference Figure 2 and Figure 3In this embodiment, the blades 23 are spiral-shaped, and a water guide cavity is formed between two adjacent blades 23 and the inner shell 21 and the outer shell 22. The top of the water guide cavity is the outlet of the impeller 2, and the bottom of the water guide cavity is the inlet of the impeller 2. The top of the water guide cavity is connected to the inlet of the flow channel in the pump casing 1, and the water guide cavity is connected to the water outlet 6 through the flow channel in the pump casing 1; at the same time, in order to prevent large-volume foreign matter mixed in the water from entering the impeller 2 from the water pumping port 5 during the pumping process, an interception net can also be installed at the water pumping port 5. In this application, the interception net can be directly fixed to the outer wall of the drive motor 4 by bolts, so that foreign matter in the water can be intercepted by the interception net, thereby ensuring the normal rotation of the impeller 2.

[0042] Reference Figure 2 and Figure 3 A first clamping structure 8 is provided at the top of the pump shaft 3. The first clamping structure 8 is used to prevent the impeller 2 from separating from the pump shaft 3. The first clamping structure 8 includes an abutting sleeve 81. A connecting column 31 is integrally formed at the top of the pump shaft 3. The abutting sleeve 81 is threadedly connected to the connecting column 31, and the bottom end of the abutting sleeve 81 abuts and cooperates with the top end of the inner casing 21; when in use, the impeller 2 is first sleeved on the pump shaft 3, and then the abutting sleeve 81 can be screwed on the top end of the pump shaft 3 until the bottom end of the abutting sleeve 81 abuts against the top end of the impeller 2. The installation of the impeller 2 can be realized, and the overall use is simple and convenient.

[0043] Reference Figure 1 and Figure 2 In the present application, since the outer shell 22 is arranged in an arc shape as a whole, when the impeller 2 and the pump casing 1 are installed, a cavity 24 is formed between the outer shell 22 and the inner wall of the pump casing 1. When the drive motor 4 is started, the impeller 2 rotates to generate centrifugal force, and the water at the water suction port 5 flows toward the inlet direction of the impeller 2 under the action of centrifugal force. In this process, it is inevitable that water will be blocked by the outer shell 22 and accumulate in the cavity 24, which will easily affect the overall performance of the centrifugal pump. In order to reduce the impact of the cavity 24 between the outer wall of the impeller 2 and the inner wall of the pump casing 1 on the quality of water pumping by the centrifugal pump, a water guide plate 7 is provided between the connecting ring 9 and the pump casing 1.

[0044] Reference Figure 2 and Figure 3 The water guide plate 7 is annular as a whole, and the outer diameter of the water guide plate 7 is greater than or equal to the outer diameter of the connecting ring 9, the inner diameter of the water guide plate 7 is less than or equal to the inner diameter of the inlet of the impeller 2, and a second clamping structure 20 is provided on the connecting ring 9; when in use, the water guide plate 7 and the pump casing 1 are fixed to the connecting ring 9 together through the second clamping structure 20. At this time, the water guide plate 7 blocks the bottom opening of the cavity 24, thereby reducing the water at the water suction port 5 from entering the cavity 24. At the same time, the water at the water suction port 5 can be guided to the inlet of the impeller 2 through the water guide plate 7, and then the water can be sucked into the water guide cavity by the centrifugal force at the impeller 2.

[0045] Reference Figure 2 and Figure 3 , the second clamping structure 20 is provided with several groups, and several groups of second clamping structures 20 are evenly spaced around the bottom circumference of the connecting ring 9, and each group of second clamping structures 20 is composed of a locking bolt 201, and the locking bolts 201 are evenly spaced around the circumference of the connecting ring 9. A first mounting hole 91 is opened on the connecting ring 9, and a second mounting hole 71 is opened on the water guide plate 7. A mounting groove 11 is opened on the pump casing 1. The first mounting hole 91, the second mounting hole 71 and the mounting groove 11 are all arranged in a one-to-one correspondence with the locking bolt 201, and the first mounting hole 91, the second mounting hole 71 and the mounting groove 11 are coaxially arranged. When in use, the locking bolt 201 is inverted, and then the top end of the locking bolt 201 is passed through the first mounting hole 91 and the second mounting hole 71 in sequence and then threaded into the mounting groove 11, so that the water guide plate 7 and the pump casing 1 can be fixed to the connecting ring 9 together by the locking bolt 201.

[0046] Reference Figure 2 and Figure 3 In this embodiment, the notch of the mounting groove 11 is arranged vertically downward, which can prevent water from accumulating in the mounting groove 11 when the horizontal surface at the water suction port 5 overflows the mounting groove 11, making it more convenient to use; in addition, when the water guide plate 7 is installed, in order to further ensure that water flows from the water suction port 5 into the inlet of the impeller 2 and then flows into the flow channel in the pump casing 1 from the outlet of the impeller 2, a first sealing ring 30 is provided between the water guide plate 7 and the outer wall of the impeller 2. The first sealing ring 30 is used to seal the connection gap between the water guide plate 7 and the outer wall of the impeller 2, thereby preventing water from entering the cavity 24 from the above-mentioned connection gap; a second sealing ring 40 is also provided between the outer wall of the impeller 2 outlet and the inner wall of the pump casing 1. The second sealing ring 40 is used to seal the connection gap between the outer wall of the impeller 2 outlet and the inner wall of the pump casing 1.

[0047] Reference Figure 2 and Figure 3 A first weight-reducing groove 72 is provided on the water guide plate 7, and a second weight-reducing groove 12 is provided on the pump housing 1. When in use, the first weight-reducing groove 72 and the second weight-reducing groove 12 are provided to reduce the overall weight of the centrifugal pump, thereby facilitating the staff to carry the centrifugal pump for transportation in special use environments, such as during emergency rescue.

[0048] The implementation principle of the embodiment of the present application is as follows: during installation, first connect the drive motor 4 to the pump shaft 3, then place the water guide plate 7 on the connecting ring 9, then install the impeller 2 on the pump shaft 3 and fix the impeller 2 by screwing the abutment sleeve 81, finally place the pump housing 1 on the water guide plate 7, and align the first mounting hole 91, the second mounting hole 71 and the mounting groove 11, then screw the locking bolt 201 into the mounting groove 11, thereby completing the assembly of the centrifugal pump; when in use, directly place the centrifugal pump upright as a whole On the ground, when the water surface overflows the water pumping port 5, the driving motor 4 can be started to drive the impeller 2 to rotate. When the impeller 2 rotates, centrifugal force is generated. Then, under the combined action of the centrifugal force and the water guide plate 7, the water gradually flows to the inlet of the impeller 2, and then flows into the flow channel in the pump casing 1 through the water guide cavity in the impeller 2, and is finally discharged from the water outlet 6. During use, the water guide plate 7 introduces water into the inlet of the impeller 2, which is conducive to the water entering the impeller 2 under the action of centrifugal force, thereby ensuring the performance of the centrifugal pump.

[0049] Example 2:

[0050] Reference Figure 4 The difference between this embodiment and embodiment 1 is that in this embodiment, the power of the driving motor 4 is 30KW, the head of the centrifugal pump is 25, and the flow rate is 250.

[0051] Example 3:

[0052] Reference Figure 5 The difference between this embodiment and embodiment 1 is that, in this embodiment, the power of the driving motor 4 is 45KW, the head of the centrifugal pump is 50, and the flow rate is 250.

[0053] Example 4:

[0054] Reference Figure 6 and Figure 7 The difference between this embodiment and embodiment 1 is that a drain port 73 is provided through the bottom side of the first weight-reducing groove 72 of the water guide plate 7. The drain port 73 connects the cavity 24 between the impeller 2 and the inner wall of the pump casing 1 with the water suction port 5. At the same time, a guide convex ring 74 is integrally formed on the bottom wall of the water guide plate 7. The outer wall of the guide convex ring 74 is inclined, and one end of the guide convex ring 74 is located below the drain port 73.

[0055] Reference Figure 6 and Figure 7During use, due to the gap between the top of the outer casing 22 of the impeller 2 and the inner wall of the pump casing 1, when water flows from the impeller 2 into the flow channel in the pump casing 1, it is inevitable that it will seep into the cavity 24 between the impeller 2 and the inner wall of the pump casing 1 along the above-mentioned gap. In order to reduce the accumulation of water in the cavity 24, the water can be discharged to the water suction port 5 of the centrifugal pump through the drain port 73 under the water guide plate 7. At the same time, the water at the water suction port 5 is guided to the inlet of the impeller 2 through the guide convex ring 74 at the water suction port 5, thereby reducing the possibility of water flowing back into the cavity 24 from the drain port 73.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A vertical centrifugal pump, characterized in that: The pump comprises a pump casing (1), an impeller (2), a pump shaft (3) and a drive motor (4); a water suction port (5) is formed between the pump casing (1) and the drive motor (4); a water outlet (6) is provided at one end of the pump casing (1) away from the drive motor (4); a water guide plate (7) is provided between the pump casing (1) and the drive motor (4); the water guide plate (7) is used to guide water into the inlet of the impeller (2); and the impeller (2) and the water guide plate (7) are rotatably matched.

2. A vertical centrifugal pump according to claim 1, characterized in that: The impeller (2) comprises an inner casing (21), an outer casing (22), and blades (23) arranged between the inner casing (21) and the outer casing (22); the inner casing (21) is coaxially sleeved on the pump shaft (3); one end of the blade (23) is fixed to the inner casing (21), and the other end of the blade (23) is fixed to the outer casing (22); the outer casing (22), the blade (23) and the inner casing (21) together form a guide The water cavity is connected to the water outlet (6) of the pump housing (1); the outer housing (22) is rotatably connected to the water guide plate (7); the inner housing (21) is rotatably connected to the pump housing (1); a cavity (24) is formed between the outer housing (22) and the pump housing (1); the water guide plate (7) is sealed at the cavity opening of the cavity (24); and a first clamping structure (8) is further provided on the pump shaft (3) for preventing the inner housing (21) from being separated from the pump shaft (3).

3. A vertical centrifugal pump according to claim 2, characterized in that: The first clamping structure (8) comprises an abutting sleeve (81) threadedly connected to the end of the pump shaft (3), and one end of the abutting sleeve (81) is in abutment with the inner housing (21).

4. A vertical centrifugal pump according to claim 1, characterized in that: A connecting ring (9) is provided on the driving motor (4), and a plurality of connecting rods (10) are provided between the connecting ring (9) and the driving motor (4). The plurality of connecting rods (10) are evenly spaced along the circumference of the connecting ring (9), and one end of the connecting rod (10) is fixed to the outer wall of the driving motor (4), and the other end of the connecting rod (10) is fixedly connected to the connecting ring (9). The water pumping port (5) is provided between two adjacent connecting rods (10). The pump housing (1) is located on the connecting ring (9), and the water guide plate (7) is located between the connecting ring (9) and the pump housing (1). The connecting ring (9) is provided with a second clamping structure (20) for fixedly connecting the connecting ring (9) with the water guide plate (7) and the pump housing (1).

5. A vertical centrifugal pump according to claim 4, characterized in that: The second clamping structure (20) includes a locking bolt (201) arranged on the connecting ring (9), a first mounting hole (91) is provided on the connecting ring (9), a second mounting hole (71) is provided on the water guide plate (7), and a mounting groove (11) is provided on the pump housing (1), and one end of the locking bolt (201) passes through the first mounting hole (91) and the second mounting hole (71) in sequence and is then threadedly connected in the mounting groove (11).

6. A vertical centrifugal pump according to claim 1, characterized in that: A first weight-reducing groove (72) is provided on the water guide plate (7), and a second weight-reducing groove (12) is provided on the pump housing (1).

7. A vertical centrifugal pump according to claim 1, characterized in that: A first sealing ring (30) is provided between the water guide plate (7) and the outer wall of the impeller (2) inlet, and a second sealing ring (40) is provided between the outer wall of the impeller (2) outlet and the inner wall of the pump casing (1).

8. A vertical centrifugal pump according to claim 2, characterized in that: A drainage port (73) is provided on one side of the water guide plate (7), and the drainage port (73) connects the water pumping port (5) with the cavity (24). A guide convex ring (74) is provided at the opening of the drainage port (73) facing the water pumping port (5).

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