A centrifugal pump with an inlet tapered jet slot

Abstract

The utility model relates to the technical field of centrifugal pumps, and in particular to a centrifugal pump with an inlet tapered jet groove; technical problem: when a centrifugal pump is used for pressurization, part of the medium pressurized by the centrifugal pump will return to the inlet of the impeller through the sealed reflux gap, and since the pressure of the reflux medium is relatively high, after merging with the inlet medium, it is easy to cause obstruction to the inlet medium, resulting in a change in the flow state of the medium, thereby affecting the cavitation performance and efficiency of the pump body; technical solution: a centrifugal pump with an inlet tapered jet groove, comprising a pump body assembly, an impeller assembly and a pump cover assembly; compared with traditional centrifugal pumps, the utility model can change the angle of the sealed reflux gap by setting the coordinated use of a pump body structure and an impeller structure, and when the medium is extracted, the reflux medium can be gathered and directly injected into the medium extracted at the impeller inlet, thereby accelerating the flow rate of the medium at the pump inlet, thereby improving the efficiency and cavitation performance of the pump.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a centrifugal pump with an inlet taper jet groove. Background Art

[0002] The single-stage single-suction centrifugal pump is a common type of industrial pump, widely used in industrial production, water supply, water supply and drainage and other fields. When the pump rotor rotates, the liquid is sucked into the pump casing and flows along the flow channel in the pump casing. Under the action of centrifugal force, the liquid is pushed to the outlet of the pump casing and transported to a specific position through the outlet pipeline, so that the centrifugal pump can achieve efficient transportation and pressurization. The structure of the single-stage single-suction centrifugal pump mainly includes pump body, pump cover, impeller, pump shaft, mechanical seal, bearing body and other components. There is a rotating sealing gap between the pump body and the impeller of this structure centrifugal pump. This gap is formed by the pump body sealing ring installed on the pump body and the impeller sealing ring installed on the impeller, which plays a sealing role. When the centrifugal pump is used for boosting, part of the medium after the centrifugal pump boosting flows through the sealed reflux gap and returns to the inlet of the impeller. Due to the high pressure of the reflux medium, the direction of the reflux is perpendicular to the flow of the inlet medium, which is easy to cause obstruction to the inlet medium, resulting in a change in the flow state of the medium, thereby affecting the cavitation performance and efficiency of the pump body. Utility Model Content

[0003] In order to overcome the problem that when using a centrifugal pump for boosting, part of the medium after being pressurized by the centrifugal pump will flow through the sealed reflux gap and return to the inlet of the impeller. Since the pressure of the reflux medium is relatively high and the direction of the reflux is perpendicular to the flow of the inlet medium, it is easy to cause obstruction to the inlet medium, causing the flow state of the medium to change, thereby affecting the cavitation performance and efficiency of the pump body.

[0004] The technical solution of the utility model is: a centrifugal pump with an inlet tapered jet groove, comprising a supporting base plate, a fixing assembly, a pump body assembly, a sealing assembly, an impeller assembly, a pump cover assembly and a bearing assembly; the top surface of the supporting base plate is provided with a fixing assembly, the top surface of the fixing assembly is provided with a pump body assembly, the inner side of the pump body assembly is provided with a sealing assembly, the inner side of the pump body assembly is provided with an impeller assembly, the side of the impeller assembly is provided with a pump cover assembly, and the side of the pump cover assembly is provided with a bearing assembly.

[0005] Preferably, the fixing assembly can fix the pump body assembly on the supporting base plate to maintain the stability of the device. The pump body assembly can extract and transport the medium with the assistance of the impeller assembly. The sealing assembly can provide a sealing effect for the device to prevent liquid leakage. The impeller assembly can extract the liquid and transport the liquid after pressurization. The pump cover assembly can cooperate with the pump body assembly to fix and seal the centrifugal pump. The bearing assembly can provide support and protection for the bearing.

[0006] Preferably, the fixing assembly includes an L-shaped fixing bracket and fixing bolts; an L-shaped fixing bracket is arranged on the top surface of the supporting base plate, two groups of L-shaped fixing brackets are arranged, and fixing bolts are arranged on the top surface of the L-shaped fixing bracket. The centrifugal pump body is fixedly mounted on the supporting base plate by means of the fixing bolts and the L-shaped fixing bracket, thereby maintaining the stability of the device.

[0007] Preferably, the pump body assembly includes a centrifugal pump body, a water inlet, a water outlet and an outer cone; the centrifugal pump body is arranged on the top surface of the L-shaped fixed bracket, the water inlet is arranged on the side of the centrifugal pump body, the water outlet is arranged on the top surface of the centrifugal pump body, and the outer cone is arranged on the inner side of the water inlet, the medium is drawn into the centrifugal pump body through the water inlet, and the medium is transported out of the pump body through the water outlet.

[0008] Preferably, the sealing assembly includes a pump body sealing ring and an impeller sealing ring; a pump body sealing ring is arranged on the inner side of the centrifugal pump body, and an impeller sealing ring is arranged on the inner side of the pump body sealing ring. The pump body sealing ring and the impeller sealing ring are utilized to provide a sealing effect for the centrifugal pump to prevent leakage of the medium.

[0009] Preferably, the impeller assembly includes an impeller bracket, an inner cone, a tapered groove, an impeller body, a pump shaft and an impeller nut; an impeller bracket is arranged on the inner side of the impeller sealing ring, an inner cone is arranged on the side of the impeller bracket, a tapered groove is opened on the side of the inner cone, an impeller body is arranged on the inner side of the impeller bracket, and multiple groups of impeller bodies are arranged, a pump shaft is arranged on the inner side of the impeller bracket, and an impeller nut is arranged on the inner side of the pump shaft. The impeller bracket is used to provide support for the impeller body, the impeller bracket and the pump shaft are fixed by the impeller nut, and the pump shaft is used to drive the impeller body to rotate through the impeller bracket, so that the medium is extracted and pressurized for transportation, and the tapered groove formed between the outer cone and the inner cone is used to make the refluxed medium form a jet that is injected into the impeller body inlet, thereby accelerating the flow rate of the medium at the water inlet and improving the efficiency and cavitation performance of the pump.

[0010] Preferably, the pump cover assembly includes a pump body cover, a sealing ring and a pump cover nut; a pump body cover is provided on the side of the centrifugal pump body, a sealing ring is provided on the inner side of the pump body cover, the sealing ring is provided on the outer side of the impeller bracket, and a pump cover nut is provided on the side of the pump body cover. There are multiple groups of pump cover nuts, and the pump body cover is fixedly connected to the centrifugal pump body through the pump cover nuts, and the sealing ring is used to increase the sealing effect between the pump body cover and the impeller bracket.

[0011] Preferably, the bearing assembly includes a bearing body, a mechanical seal and a bearing nut; a bearing body is arranged on the side of the pump body cover, a mechanical seal is arranged on the inner side of the bearing body, the mechanical seal is arranged on the outer side of the pump shaft, a bearing nut is arranged on the side of the bearing body, and multiple groups of bearing nuts are arranged. The bearing body is used to provide support and protection for the pump shaft. The bearing nut fixes the bearing body and the pump body cover to maintain the stability of the device, and the mechanical seal is used to further enhance the sealing effect inside the centrifugal pump.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with the existing technology, when a centrifugal pump is used for boosting, part of the medium after boosting by the centrifugal pump will return to the inlet of the impeller after flowing through the gap of the sealed reflux. Since the pressure of the reflux medium is relatively high, the direction of the reflux is perpendicular to the flow direction of the inlet medium, which is easy to cause obstruction to the inlet medium, resulting in a change in the flow state of the medium, thereby affecting the cavitation performance and efficiency of the pump body. By setting the pump body structure and the impeller structure for coordinated use, the angle of the sealed reflux gap can be changed. When the medium is extracted, the reflux medium can be converged and then injected into the medium extracted at the impeller inlet, thereby accelerating the flow rate of the medium at the pump inlet, thereby improving the efficiency and cavitation performance of the pump;

[0014] 2. Use the impeller bracket to provide support for the impeller body, fix the impeller bracket and the pump shaft through the impeller nut, and use the pump shaft to drive the impeller body to rotate through the impeller bracket, so that the medium is extracted into the centrifugal pump body through the water inlet, and transported out of the pump body through the water outlet after pressurization. The conical groove formed between the outer cone and the inner cone is used to make the refluxed medium form a jet that is injected into the impeller body inlet, thereby accelerating the flow rate of the medium at the water inlet and improving the efficiency and cavitation performance of the pump;

[0015] 3. Use fixing bolts and L-shaped fixing brackets to fix the centrifugal pump body on the supporting base plate to maintain the stability of the device. Use the pump body sealing ring and impeller sealing ring to provide sealing effect for the centrifugal pump to prevent leakage of the medium. Use the pump cover nut to fix the pump body cover to the centrifugal pump body. Use the bearing nut to fix the bearing body to the pump body cover to maintain the stability of the device. Use the sealing ring and mechanical seal to further enhance the sealing effect inside the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump with an inlet tapered jet groove of the utility model;

[0017] Figure 2 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump fixing assembly with an inlet tapered jet groove of the utility model;

[0018] Figure 3 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump sealing assembly with an inlet tapered jet groove of the utility model;

[0019] Figure 4 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump impeller assembly with an inlet tapered jet groove of the utility model;

[0020] Figure 5 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump cover assembly with an inlet tapered jet groove of the utility model;

[0021] Figure 6 What is shown is a three-dimensional structural schematic diagram of a centrifugal pump bearing assembly with an inlet tapered jet groove of the utility model;

[0022] Explanation of the reference numerals: 1. Support base plate; 2. Fixing assembly; 3. Pump body assembly; 4. Sealing assembly; 5. Impeller assembly; 6. Pump cover assembly; 7. Bearing assembly; 201. L-shaped fixing bracket; 202. Fixing bolt; 301. Centrifugal pump body; 302. Water inlet; 303. Water outlet; 304. Outer cone; 401. Pump body sealing ring; 402. Impeller sealing ring; 501. Impeller bracket; 502. Inner cone; 503. Tapered jet groove; 504. Impeller body; 505. Pump shaft; 506. Impeller nut; 601. Pump body cover; 602. Sealing ring; 603. Pump cover nut; 701. Bearing body; 702. Mechanical seal; 703. Bearing nut. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] See also Figure 1 The utility model provides an embodiment: a centrifugal pump with an inlet tapered jet groove, comprising a supporting base plate 1, a fixing component 2, a pump body component 3, a sealing component 4, an impeller component 5, a pump cover component 6 and a bearing component 7; the top surface of the supporting base plate 1 is provided with a fixing component 2, the top surface of the fixing component 2 is provided with a pump body component 3, the inner side of the pump body component 3 is provided with a sealing component 4, the inner side of the pump body component 3 is provided with an impeller component 5, the side of the impeller component 5 is provided with a pump cover component 6, and the side of the pump cover component 6 is provided with a bearing component 7, the fixing component 2 can fix the pump body component 3 on the supporting base plate 1, so as to maintain the stability of the device, the pump body component 3 can extract and transport the medium with the assistance of the impeller component 5, the sealing component 4 can provide a sealing effect for the device to prevent liquid leakage, the impeller component 5 can extract the liquid, and can transport the liquid after pressurization, the pump cover component 6 can cooperate with the pump body component 3 to fix and seal the centrifugal pump, and the bearing component 7 can provide support and protection for the bearing.

[0025] See also Figure 2-6 In this embodiment, the fixing assembly 2 includes an L-shaped fixing bracket 201 and a fixing bolt 202; the top surface of the supporting base plate 1 is provided with an L-shaped fixing bracket 201, and two groups of L-shaped fixing brackets 201 are provided. The top surface of the L-shaped fixing bracket 201 is provided with a fixing bolt 202, and the centrifugal pump body 301 is fixedly installed on the supporting base plate 1 by using the fixing bolt 202 and the L-shaped fixing bracket 201, so as to maintain the stability of the device. The pump body assembly 3 includes a centrifugal pump body 301, a water inlet 302, a water outlet 303 and an outer cone 304; the top surface of the L-shaped fixing bracket 201 is provided with a centrifugal pump body 301, and the centrifugal pump body A water inlet 302 is arranged on the side of 301, a water outlet 303 is arranged on the top surface of the centrifugal pump body 301, an outer cone 304 is arranged on the inner side of the water inlet 302, the medium is drawn into the centrifugal pump body 301 through the water inlet 302, and the medium is transported out of the pump body through the water outlet 303, the sealing assembly 4 includes a pump body sealing ring 401 and an impeller sealing ring 402; a pump body sealing ring 401 is arranged on the inner side of the centrifugal pump body 301, and an impeller sealing ring 402 is arranged on the inner side of the pump body sealing ring 401, the pump body sealing ring 401 and the impeller sealing ring 402 are used to provide a sealing effect for the centrifugal pump to prevent leakage of the medium.

[0026] The impeller assembly 5 includes an impeller support 501, an inner cone 502, a tapered groove 503, an impeller body 504, a pump shaft 505 and an impeller nut 506; the impeller support 501 is arranged on the inner side of the impeller sealing ring 402, the inner cone 502 is arranged on the side of the impeller support 501, the tapered groove 503 is opened on the side of the inner cone 502, the impeller body 504 is arranged on the inner side of the impeller support 501, the impeller body 504 is provided with multiple groups, the pump shaft 505 is arranged on the inner side of the impeller support 501, and the impeller nut 506 is arranged on the inner side of the pump shaft 505. 501 provides support for the impeller body 504, and the impeller bracket 501 and the pump shaft 505 are fixed by the impeller nut 506. The pump shaft 505 drives the impeller body 504 to rotate through the impeller bracket 501, so that the medium is extracted and pressurized for transportation. The conical groove 503 formed between the outer cone 304 and the inner cone 502 is used to make the refluxed medium form a jet injected into the inlet of the impeller body 504, thereby accelerating the flow rate of the medium at the water inlet 302, and improving the efficiency and cavitation performance of the pump. The pump cover assembly 6 includes a pump body cover 601, a sealing ring 602 and pump cover nut 603; a pump cover 601 is arranged on the side of the centrifugal pump body 301, a sealing ring 602 is arranged on the inner side of the pump cover 601, and the sealing ring 602 is arranged on the outer side of the impeller bracket 501, and a pump cover nut 603 is arranged on the side of the pump cover 601, and a plurality of pump cover nuts 603 are arranged, and the pump cover 601 is fixedly connected to the centrifugal pump body 301 through the pump cover nut 603, and the sealing ring 602 is used to increase the sealing effect between the pump cover 601 and the impeller bracket 501, and the bearing assembly 7 includes a bearing body 701, a mechanical seal 70 2 and bearing nut 703; a bearing body 701 is arranged on the side of the pump body cover 601, a mechanical seal 702 is arranged on the inner side of the bearing body 701, the mechanical seal 702 is arranged on the outer side of the pump shaft 505, a bearing nut 703 is arranged on the side of the bearing body 701, and a plurality of bearing nuts 703 are arranged. The bearing body 701 is used to provide support and protection for the pump shaft 505. The bearing nut 703 fixes the bearing body 701 and the pump body cover 601 to maintain the stability of the device, and the mechanical seal 702 is used to further enhance the sealing effect inside the centrifugal pump.

[0027] During operation, the centrifugal pump body 301 is fixedly mounted on the support base plate 1 by means of fixing bolts 202 and L-shaped fixing brackets 201, thereby maintaining the stability of the device, the impeller bracket 501 is used to provide support for the impeller body 504, and the impeller bracket 501 is fixed to the pump shaft 505 by means of impeller nuts 506;

[0028] The pump shaft 505 drives the impeller body 504 to rotate through the impeller bracket 501, so that the medium is pumped into the centrifugal pump body 301 through the water inlet 302, and is transported out of the pump body through the water outlet 303 after being pressurized. The pump body sealing ring 401 and the impeller sealing ring 402 provide a sealing effect for the centrifugal pump to prevent leakage of the medium.

[0029] The tapered groove 503 formed between the outer cone 304 and the inner cone 502 is used to make the refluxed medium form a jet that is injected into the inlet of the impeller body 504, thereby accelerating the flow rate of the medium at the water inlet 302 and improving the efficiency and cavitation performance of the pump;

[0030] The pump cover 601 is fixedly connected to the centrifugal pump body 301 by means of a pump cover nut 603, and a sealing ring 602 is used to increase the sealing effect between the pump cover 601 and the impeller support 501;

[0031] The bearing body 701 is used to provide support and protection for the pump shaft 505. The bearing nut 703 fixes the bearing body 701 and the pump body cover 601 to maintain the stability of the device. The mechanical seal 702 is used to further enhance the sealing effect inside the centrifugal pump.

[0032] Through the above steps, the pump body assembly 3 is fixed on the supporting base plate 1 by using the fixing assembly 2 to maintain the stability of the device, the medium is extracted into the pump body assembly 3 by using the impeller assembly 5, and the medium is transported out of the pump body assembly 3 after being pressurized, the sealing assembly 4 is used to provide a sealing effect for the device to prevent liquid leakage, the centrifugal pump is fixed and sealed by the pump cover assembly 6 in cooperation with the pump body assembly 3, and the bearing assembly 7 is used to provide support and protection for the bearing.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A centrifugal pump with an inlet tapered jet trough, comprising a supporting base plate (1); characterized in that: The invention also comprises a fixing assembly (2), a pump body assembly (3), a sealing assembly (4), an impeller assembly (5), a pump cover assembly (6) and a bearing assembly (7); the fixing assembly (2) is arranged on the top surface of the supporting base plate (1), the pump body assembly (3) is arranged on the top surface of the fixing assembly (2), the sealing assembly (4) is arranged on the inner side of the pump body assembly (3), the impeller assembly (5) is arranged on the inner side of the pump body assembly (3), the pump cover assembly (6) is arranged on the side of the impeller assembly (5), and the bearing assembly (7) is arranged on the side of the pump cover assembly (6).

2. A centrifugal pump with an inlet tapered jet groove according to claim 1, characterized in that: The fixing assembly (2) comprises an L-shaped fixing bracket (201) and fixing bolts (202); the top surface of the supporting base plate (1) is provided with an L-shaped fixing bracket (201), two groups of the L-shaped fixing bracket (201) are provided, and the top surface of the L-shaped fixing bracket (201) is provided with a fixing bolt (202).

3. A centrifugal pump with an inlet tapered jet groove according to claim 2, characterized in that: The pump body assembly (3) comprises a centrifugal pump body (301), a water inlet (302), a water outlet (303) and an outer cone (304); the centrifugal pump body (301) is arranged on the top surface of the L-shaped fixing bracket (201), the water inlet (302) is arranged on the side surface of the centrifugal pump body (301), the water outlet (303) is arranged on the top surface of the centrifugal pump body (301), and the outer cone (304) is arranged on the inner side of the water inlet (302).

4. A centrifugal pump with an inlet tapered jet groove according to claim 3, characterized in that: The sealing assembly (4) comprises a pump body sealing ring (401) and an impeller sealing ring (402); the pump body sealing ring (401) is arranged on the inner side of the centrifugal pump body (301), and the impeller sealing ring (402) is arranged on the inner side of the pump body sealing ring (401).

5. A centrifugal pump with an inlet tapered jet groove according to claim 4, characterized in that: The impeller assembly (5) comprises an impeller support (501), an inner cone (502), a tapered groove (503), an impeller body (504), a pump shaft (505) and an impeller nut (506); the impeller support (501) is arranged on the inner side of the impeller sealing ring (402), the inner cone (502) is arranged on the side of the impeller support (501), the tapered groove (503) is opened on the side of the inner cone (502), the impeller body (504) is arranged on the inner side of the impeller support (501), the impeller body (504) is arranged in multiple groups, the pump shaft (505) is arranged on the inner side of the impeller support (501), and the impeller nut (506) is arranged on the inner side of the pump shaft (505).

6. A centrifugal pump with an inlet tapered jet groove according to claim 3, characterized in that: The pump cover assembly (6) comprises a pump body cover (601), a sealing ring (602) and a pump cover nut (603); the pump body cover (601) is arranged on the side of the centrifugal pump body (301), the sealing ring (602) is arranged on the inner side of the pump body cover (601), the sealing ring (602) is arranged on the outer side of the impeller support (501), the pump body cover (601) is arranged on the side of the pump body cover (601), and the pump cover nut (603) is arranged in multiple groups.

7. A centrifugal pump with an inlet tapered jet groove according to claim 6, characterized in that: The bearing assembly (7) comprises a bearing body (701), a mechanical seal (702) and a bearing nut (703); the bearing body (701) is arranged on the side of the pump body cover (601), the mechanical seal (702) is arranged on the inner side of the bearing body (701), the mechanical seal (702) is arranged on the outer side of the pump shaft (505), the bearing nut (703) is arranged on the side of the bearing body (701), and the bearing nut (703) is arranged in multiple groups.

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