Open impeller centrifugal pump capable of adjusting clearance in volute

Abstract

The utility model discloses an open-type impeller centrifugal pump capable of adjusting a clearance in a volute. The open-type impeller centrifugal pump comprises a supporting plate, a first motor and a pump shell, wherein the first motor and the pump shell are installed on the supporting plate. A supporting frame is fixedly installed on the supporting plate and fixedly connected with the first motor and the pump shell. A disc is arranged in an inner cavity of the pump shell, a second motor is arranged in an inner cavity of the disc, and the output end of the second motor is connected with a rotating shaft which penetrates through the second rotating disc and is fixedly connected with the first rotating disc. The second motor drives the rotating shaft to rotate, the rotating shaft drives the first rotating disc to rotate, the first rotating disc drives the rotating rod to move on the first limiting groove and the second limiting groove, the rotating rod drives the connecting rod to move up and down, the connecting rod drives the impeller body to move up and down, and the gap of the impeller body can be adjusted according to different factors such as liquid flow and pressure; by adjusting the proper impeller main body gap, the operation efficiency of the centrifugal pump is improved, the noise of the centrifugal pump is reduced, high-pressure liquid is prevented from leaking from the gap, and the loss of the centrifugal pump is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump technology, specifically, it relates to an open impeller centrifugal pump with adjustable clearance inside the volute casing. Background Technology

[0002] The basic structure of a centrifugal pump consists of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and stuffing box. The impeller can be classified into three types according to its structure: closed, open, and semi-open.

[0003] Industrial pumps often transport liquid media containing suspended solids such as particles and fibers, as well as viscous and slurry liquids. To avoid entanglement, blockage and other failures during operation, pumps with open impeller structures are generally selected.

[0004] Since open impellers do not have a front cover plate (semi-open) or front and rear cover plates (fully open), they are more suitable for conveying liquids containing suspended solids, particles and high viscosity. However, while meeting a certain medium throughput, the pump efficiency will also decrease.

[0005] Patent CN214330906U discloses a novel open impeller centrifugal pump. By setting threads within the impeller profile, the connection between the shaft and the impeller becomes more stable and reliable. A back impeller is installed on the impeller rear cover plate to effectively balance axial forces. A corrugated gasket is placed between the bushing's limiting sleeve and the shaft to prevent damage to the sealing surface. This reduces maintenance frequency, facilitates installation and disassembly, and improves work efficiency. However, this patent cannot handle the transport of more complex mixed media and cannot adjust the impeller according to the actual liquid conditions, thus failing to improve the centrifugal pump's operating efficiency.

[0006] The technical solutions of the aforementioned patents have problems such as the inability to adjust the appropriate impeller clearance according to the flow rate of the mixed liquid, resulting in excessive vortices in the fluid at the impeller clearance and a decrease in centrifugal pump efficiency. Utility Model Content

[0007] To address the problem that existing technologies cannot flexibly adapt to the needs of different liquid media, flow rates, and pressures, resulting in decreased operating efficiency of centrifugal pumps, this utility model provides an open impeller centrifugal pump with adjustable clearance inside the volute casing.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] An open impeller centrifugal pump with adjustable clearance inside the volute includes a support plate, a first motor mounted on the support plate, and a pump casing; a support frame is fixedly mounted on the upper part of the support plate, and the support frame is fixedly connected to the bottom of the first motor and the bottom of the pump casing; a disc is provided in the inner cavity of the pump casing, and a second motor is provided in the inner cavity of the disc, the output end of the second motor is connected to a rotating shaft, and the rotating shaft passes through the second rotating disc and is fixedly connected to the first rotating disc.

[0010] Furthermore, the pump casing is a cylindrical structure with a hollow interior; a discharge pipe is provided through the upper side of the pump casing, and a suction pipe is provided through the bottom surface of the pump casing.

[0011] Furthermore, the disc is a cylindrical structure with a hollow interior; the output end of the first motor is connected to the pump shaft, which passes through the bottom surface of the pump casing and is fixedly connected to the bottom surface of the disc; the first motor drives the pump shaft to rotate in a circular motion, and the pump shaft drives the disc to rotate in a circular motion.

[0012] Furthermore, the side of the second turntable is fixedly connected to the inner cavity side of the pump housing, and a second limiting groove is provided on the second turntable, which is in a straight line shape.

[0013] Furthermore, one end of the rotating shaft is fixedly connected to the bottom surface of the first turntable, and a first limiting groove is provided on the first turntable. The first limiting groove is arc-shaped; the openings of the first limiting groove and the second limiting groove near the center are parallel and aligned.

[0014] Furthermore, the first limiting groove and the second limiting groove are provided with a cooperating rotating rod, which passes through the first limiting groove and the second limiting groove. The two ends of the rotating rod are larger than the size of the middle part of the rotating rod. One end of the connecting rod is fixedly installed in the middle part of the rotating rod, and the other end of the connecting rod passes through the side of the disc and is fixedly connected to the impeller body. The impeller body is installed in the inner cavity of the pump casing.

[0015] Furthermore, the second motor drives the rotating shaft to rotate, the rotating shaft drives the first turntable to rotate, the first turntable drives the rotating rod to move in the first limiting groove in the 0-30 degree direction, and moves up and down in the second limiting groove in a straight line. The rotating rod drives the connecting rod to move up and down, and the connecting rod drives the impeller body to move up and down.

[0016] The beneficial effects of this utility model are:

[0017] 1) This utility model uses a second motor to drive a rotating shaft to rotate, which in turn drives a first rotating disk to rotate. The first rotating disk drives a rotating rod to move on the first and second limiting grooves. The rotating rod drives a connecting rod to move up and down, and the connecting rod drives the impeller body to move up and down. The clearance of the impeller body can be adjusted according to different liquid flow rates, pressures, and other factors.

[0018] 2) By adjusting the appropriate impeller body clearance, this utility model improves the operating efficiency of the centrifugal pump, prevents hydraulic vibration of the centrifugal pump, reduces the noise of the centrifugal pump, increases the sealing between the impeller body and the pump casing, prevents high-pressure liquid from leaking from the gap, and reduces the loss of the centrifugal pump. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the inside of the pump casing of this utility model;

[0022] Figure 3 This utility model is a schematic diagram of a disc;

[0023] Figure 4 This is a schematic diagram showing the connection between the first and second turntables of this utility model;

[0024] Figure 5 This is a schematic diagram of the interior of the first and second turntables of this utility model;

[0025] The list of components represented by each number in the attached diagram is as follows:

[0026] 1. First motor; 2. Support plate; 3. Pump shaft; 4. Discharge pipe; 5. Suction pipe; 6. Pump casing; 7. Disc; 701. First turntable; 702. First limiting groove; 703. Rotating rod; 704. Connecting rod; 705. Second turntable; 706. Second limiting groove; 707. Second motor; 708. Rotating shaft; 8. Impeller body. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 and Figure 2 as well as Figure 3As shown, an open impeller centrifugal pump with adjustable clearance inside the volute includes a support plate 2, a first motor 1 and a pump casing 6 mounted on the support plate 2; a support frame is fixedly mounted on the upper part of the support plate 2, and the support frame is fixedly connected to the bottom of the first motor 1 and the bottom of the pump casing 6.

[0029] The pump casing 6 is a cylindrical structure with a hollow interior. The upper side of the pump casing 6 is provided with a discharge pipe 4, and the bottom surface of the pump casing 6 away from the motor is provided with a suction pipe 5.

[0030] The pump casing 6 has a disc 7 inside its cavity. The disc 7 is a cylindrical structure with a hollow interior. The output end of the first motor 1 is connected to the pump shaft 3. The pump shaft 3 passes through a bottom surface of the pump casing 6 and is fixedly connected to the bottom surface of the disc 7 near the first motor 1. The first motor 1 drives the pump shaft 3 to rotate in a circular motion, and the pump shaft 3 drives the disc 7 to rotate in a circular motion.

[0031] Please refer to it again. Figure 4 and Figure 5 As shown, a second motor 707 is provided in the inner cavity of the disc 7. The output end of the second motor 707 is connected to a rotating shaft 708. The rotating shaft 708 passes through the second disc 705 and is fixedly connected to the first disc 701. The side of the second disc 705 is fixedly connected to the inner cavity side of the pump housing 6. A second limiting groove 706 is provided on the second disc 705. The second limiting groove 706 is in a straight line shape. In this embodiment, four second limiting grooves 706 are provided, which are arranged in pairs with the number of impeller bodies 8.

[0032] One end of the rotating shaft 708 is fixedly connected to the bottom surface of the first turntable 701 near the second turntable 705. The first turntable 701 has a first limiting groove 702, which is arc-shaped. The openings of the first limiting groove 702 and the second limiting groove 706 near the center are parallel and aligned. In this embodiment, four first limiting grooves 702 are provided, which are paired with the number of impeller body 8 and second limiting grooves 706.

[0033] The first limiting groove 702 and the second limiting groove 706 are provided with a cooperating rotating rod 703. The rotating rod 703 passes through the first limiting groove 702 and the second limiting groove 706. The two ends of the rotating rod 703 are larger than the size of the middle part of the rotating rod 703. One end of the connecting rod 704 is fixedly installed in the middle part of the rotating rod 703. The other end of the connecting rod 704 passes through the side of the disc 7 and is fixedly connected to the impeller body 8. The impeller body 8 is installed in the inner cavity of the pump casing 6.

[0034] The second motor 707 drives the rotating shaft 708 to rotate, the rotating shaft 708 drives the first turntable 701 to rotate, the first turntable 701 drives the rotating rod 703 to move in the first limiting groove 702 in a 0-30 degree direction, and moves up and down in the second limiting groove 706 in a straight line. The rotating rod 703 drives the connecting rod 704 to move up and down, and the connecting rod 704 drives the impeller body 8 to move up and down.

[0035] When the rotating rod 703 is at the end of the first limiting groove 702 and the second limiting groove 706 near the center, the clearance of the impeller body 8 is the smallest. When the clearance of the impeller body 8 is the smallest, the flow channel area of ​​the liquid becomes smaller and the flow velocity increases when the liquid passes through the impeller body 8, thereby improving the head and efficiency of the centrifugal pump.

[0036] When the rotating rod 703 is at the end of the first limiting groove 702 and the second limiting groove 706 away from the center, the clearance of the impeller body 8 is at its maximum. Adjusting the appropriate clearance of the impeller body 8 can ensure that the liquid does not generate too many vortices at the clearance of the impeller body 8, thus avoiding a decrease in the efficiency of the centrifugal pump.

[0037] To facilitate understanding of the above-mentioned technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below: First, the flow rate of the mixed liquid is calculated, and then the second motor 707 drives the rotating shaft 708 to rotate. The rotating shaft 708 drives the first turntable 701 to rotate. The first turntable 701 drives the rotating rod 703 to move in the first limiting groove 702 and in the second limiting groove 706 along a straight line. The rotating rod 703 drives the connecting rod 704 to move up and down. The connecting rod 704 drives the impeller body 8 to move up and down. Once the appropriate impeller body 8 clearance is adjusted, the first motor 1 is turned on. The first motor 1 drives the pump shaft 3 to rotate, the pump shaft 3 drives the disc 7 to rotate, and the disc 7 drives the impeller body 8 to rotate. Liquid enters the centrifugal pump body from the suction pipe 5. The liquid is sucked into the space between the pump casing 6 and the impeller body 8, and the amount of liquid entering the pump casing 6 is further increased. When the impeller body 8 rotates, the liquid is subjected to centrifugal force, which generates acceleration, thereby increasing the liquid pressure. The increased pressure pushes the liquid towards the discharge pipe 4, further increasing the liquid velocity and pressure.

[0038] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, all of which should fall within the protection scope of this utility model.

Claims

1. An open impeller centrifugal pump with volute inside adjustment gap, comprising a support plate (2) and a first motor (1) and a pump shell (6) installed on the support plate (2); the upper part of the support plate (2) is fixedly installed with a support frame, and the support frame is fixedly connected with the bottom of the first motor (1) and the bottom of the pump shell (6); characterized in that: The inner cavity of the pump shell (6) is provided with a disc (7), the inner cavity of the disc (7) is provided with a second motor (707), the output end of the second motor (707) is connected with a rotating shaft (708), the rotating shaft (708) penetrates through a second rotating disc (705) and is fixedly connected with a first rotating disc (701).

2. An open impeller centrifugal pump with an adjustable gap in the volute according to claim 1, characterized in that: The pump shell (6) is a cylindrical structure, and the inside of the pump shell (6) is a hollow part; the upper side of the pump shell (6) is provided with a pressing-out pipe (4) penetrating therethrough, and the bottom surface of the pump shell (6) is provided with a suction pipe (5) penetrating therethrough.

3. A centrifugal pump according to claim 1, wherein: The disc (7) is a cylindrical structure, and the inside of the disc (7) is a hollow part; the output end of the first motor (1) is connected with a pump shaft (3), the pump shaft (3) penetrates through a bottom surface of the pump shell (6) and is fixedly connected with the bottom surface of the disc (7); the first motor (1) drives the pump shaft (3) to rotate circumferentially, and the pump shaft (3) drives the disc (7) to rotate circumferentially.

4. A centrifugal pump according to claim 1, wherein: The side surface of the second rotating disc (705) is fixedly connected with the inner cavity side surface of the pump shell (6), and the second rotating disc (705) is provided with a second limiting groove (706) in a straight line shape.

5. A centrifugal pump according to claim 1, wherein: The bottom surface of the first rotating disc (701) is fixedly connected with one end of the rotating shaft (708), and the first rotating disc (701) is provided with a first limiting groove (702) in an arc shape; the first limiting groove (702) and the second limiting groove (706) are parallel to each other at one end slot opening close to the center.

6. An open impeller centrifugal pump with an adjustable gap in the volute according to claim 5, characterized in that: The first limiting groove (702) and the second limiting groove (706) are provided with a matched rotating rod (703), the rotating rod (703) penetrates through the first limiting groove (702) and the second limiting groove (706), and the two end portions of the rotating rod (703) are larger than the size of the middle portion of the rotating rod (703); one end of a connecting rod (704) is fixedly and connectively installed on the middle portion of the rotating rod (703), and the other end of the connecting rod (704) penetrates through the side surface of the disc (7) and is fixedly connected with an impeller main body (8), and the impeller main body (8) is installed in the inner cavity of the pump shell (6).

7. A centrifugal pump according to claim 1, wherein: The second motor (707) drives the rotating shaft (708) to rotate, the rotating shaft (708) drives the first rotating disc (701) to rotate, the first rotating disc (701) drives the rotating rod (703) to move in the 0-30 degree direction in the first limiting groove (702) and to move up and down in the straight line direction in the second limiting groove (706), the rotating rod (703) drives the connecting rod (704) to move up and down, and the connecting rod (704) drives the impeller main body (8) to move up and down.

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