Vortex pump

Abstract

The invention belongs to the technical field of fluid machinery, and particularly relates to a vortex pump which comprises a pump body, an impeller, an inner pump cover, an auxiliary impeller, a sealing cavity, a mechanical seal and a bearing component. The pump body is fixedly connected with the bearing component; the inner pump cover, the auxiliary impeller, the sealing cavity and the mechanical sealing piece are arranged on the impeller in a sleeving mode. An inner pump cover is arranged at one end of the auxiliary impeller; a sealing cavity is formed in the other end of the auxiliary impeller; a mechanical seal is arranged at the end, away from the auxiliary impeller, of the sealing cavity. The mechanical seal is arranged in the bearing component; the two sides of the inner pump cover are fixedly connected with the bearing component; the two sides of the sealing cavity are fixedly connected with the bearing component. According to the vortex pump, media are not prone to crystallization, the sealing effect is high, the vortex pump is not prone to damage, the suction speed is reduced, the suction performance is improved, energy loss is reduced, the efficiency of the pump is greatly improved, and the problems of high noise and large vibration in the operation process are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid machinery, and in particular relates to a vortex pump. Background Art

[0002] Swirl pumps are mostly used in chemical processes to transport materials with high particle content and long fibers and to discharge wastewater. With the increasing application of vortex pumps in the processes of the chemical and petrochemical industries, the requirements for pump operation reliability, energy efficiency, and environmental protection are also increasing. The performance deficiencies of vortex pumps in the existing technology currently limit the use of pumps, such as the medium is easy to crystallize, the seal is easy to damage, and the operation noise is high and the vibration is large, which will cause energy loss in the pump body and low hydraulic efficiency. Summary of the invention

[0003] In order to solve the defects in the above-mentioned prior art, the present invention provides a vortex pump with medium that is not easy to crystallize, high sealing effect and not easy to be damaged, which reduces the suction speed, improves the suction performance, and solves the problems of high operating noise and large vibration.

[0004] In order to solve the technical problem, the technical solution adopted by the present invention is: a vortex pump, including a pump body, an impeller, an inner pump cover, an auxiliary impeller, a sealing chamber, a mechanical seal and a bearing component; the pump body and the bearing component are fixedly connected; the pump cover, the auxiliary impeller, the sealing chamber and the mechanical seal are sleeved on the impeller; an inner pump cover is provided at one end of the auxiliary impeller; a sealing chamber is provided at the other end of the auxiliary impeller; a mechanical seal is provided at the end of the sealing chamber away from the auxiliary impeller; the mechanical seal is placed in the bearing component; both sides of the inner pump cover are fixedly connected to the bearing component; both sides of the sealing chamber are fixedly connected to the bearing component.

[0005] Furthermore, the impeller includes a wheel body, an axle at the center of the wheel body and blades on the side of the wheel body, and the blades are composed of a blade front section, a blade middle section and a blade rear section in sequence; the inlet placement angle of the blade front section is θ; the blade outlet angle of the blade rear section is φ; the blade middle section transitions from the blade front section to the blade rear section; the blade angle of the blade middle section conforms to the relative flow inclination angle of the liquid; the inlet placement angle θ of the blade front section ranges from 20 to 35°; the blade outlet angle φ of the blade rear section is 90°.

[0006] Furthermore, the number of blades is 8 or 12; the rear section of the blade is a straight blade; the straight blade starts to tilt at about 1 / 4 of the total length of the blade outlet end; a chamfer is set on the back of the blade; the cross-section of the blade is a pentagon; the wheel body, the axle in the center of the wheel body and the blades on the side of the wheel body rotate counterclockwise.

[0007] Furthermore, the diameter of the wheel body is greater than 315 mm, and short blades are arranged between the blade rear sections.

[0008] Furthermore, the short blade is located at the outlet of the blade, and the short blade is a straight blade segment.

[0009] Furthermore, the inlet of the short blade is inclined toward the back side of the blade.

[0010] Furthermore, the pump body includes a volute diffuser section, a volute inlet section, a baffle and a volute water pressure chamber section, a baffle is provided between the volute diffuser section and the volute water pressure chamber section; the radial diameter of the baffle is D0; the radial diameter of the outlet of the volute water pressure chamber section is D3; the ratio of D0 to D3 is within the range of 90%±3%; the pump body adopts a semi-volute water pressure chamber; the volute water pressure chamber section extends from the baffle to within 180°; the outlet of the volute water pressure chamber section to the volute outlet diffuser section is a circular water pressure chamber.

[0011] Furthermore, the volute inlet section adopts an inner diffusion inclination angle α and a large fillet angle R; the angle value of the inner diffusion inclination angle α is 2°~8°; the value of the large fillet angle R is 50% of the pump body inlet diameter size.

[0012] Compared with the prior art, the present invention has the following beneficial effects: the medium of the vortex pump is not easy to crystallize, the sealing effect is high and not easy to be damaged, the suction speed is reduced, the suction performance is improved, the energy loss is reduced, the efficiency of the pump is greatly improved, and the problems of high noise and large vibration during operation are solved. The pump head is increased through the semi-open impeller structure, the resistance loss during operation is reduced, and finally the internal flow condition of the vortex pump is improved, the passability of the vortex pump pressure chamber for liquid containing impurities and the hydraulic efficiency of the vortex pump are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a pump body according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an impeller according to an embodiment of the present invention; Figure 4 for Figure 3 Sectional view of KK; Figure 5 A schematic diagram of the structure of an impeller according to a preferred embodiment of the invention; Figure 6 for Figure 5 A cross-sectional view of In the figure: 1, wheel body, 2, wheel shaft, 3, front section of blade, 4, middle section of blade, 5, rear section of blade, 6, chamfer, 7, pump body, 8, impeller, 9, inner pump cover, 10, auxiliary impeller, 11, sealing chamber, 12, mechanical seal, 13, bearing component, 14, volute diffuser section, 15, volute inlet section, 16, baffle, 17, volute pressure water chamber section, 18, short blade, 19, blade. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0015] Combined with Figure 1-4 As shown, a vortex pump in an embodiment of the present invention comprises a pump body 7, an impeller 8, an inner pump cover 9, an auxiliary impeller 10, a sealing cavity 11, a mechanical seal 12 and a bearing component 13; the pump body 7 and the bearing component 13 are fixedly connected; the inner pump cover 9, the auxiliary impeller 10, the sealing cavity 11 and the mechanical seal 12 are set on the impeller 8; the inner pump cover 9 is provided at one end of the auxiliary impeller 108; the sealing cavity 11 is provided at the other end of the auxiliary impeller 10; the mechanical seal 12 is provided at one end of the sealing cavity 11 away from the auxiliary impeller 10; the mechanical seal 12 is placed in the bearing component 13; the two sides of the inner pump cover 9 are fixedly connected to the bearing component 13; the two sides of the sealing cavity 11 are fixedly connected to the bearing component 13.

[0016] Furthermore, the impeller 8 includes a wheel body 1, a wheel axle 2 at the center of the wheel body and blades 19 on the side of the wheel body, and the blades 19 are composed of a blade front section 3, a blade middle section 4 and a blade rear section 5 in sequence; the inlet placement angle of the blade front section 3 is θ; the blade outlet angle of the blade rear section 5 is φ; the blade middle section 4 transitions from the blade front section 3 to the blade rear section 5; the blade angle of the blade middle section 4 conforms to the relative flow inclination angle of the liquid; the inlet placement angle θ of the blade front section 3 ranges from 20 to 35°; the blade outlet angle φ of the blade rear section 5 is 90°.

[0017] In one embodiment, the number of blades is 8 (12 when the impeller diameter is greater than 400); the rear section 5 of the blade is a straight blade; the straight blade begins to tilt at about 1 / 4 of the total length of the blade outlet; a chamfer 6 is provided on the back of the blade; the cross-section of the blade is a pentagon; the wheel body 1, the wheel axle 2 at the center of the wheel body, and the blades on the side of the wheel body rotate counterclockwise.

[0018] It should be noted that the impeller 8 of the present application adopts a semi-open structure and is placed on one side of the vortex chamber. The volute flow channel of the pump body 7 in front of the impeller 8 is free of blockage, and the conveying medium containing impurities and particles is not blocked, and has good passability; at the same time, the blade inlet placement angle of the impeller 8 is between 20 and 35°. This blade inlet placement angle is similar to the blade inlet angle of other centrifugal pumps, which reduces the hydraulic loss caused by the inlet flow and the impact of the blades.

[0019] In addition, the blade outlet angle is 90°, which makes the liquid produce a larger circumferential component velocity at the outlet of the impeller 8, thereby increasing the pump head; at the same time, in the middle section of the blade, a blade angle that matches the relative flow direction of the liquid is adopted, so that the blade can smoothly transition from the inlet to the blade outlet, reducing the resistance loss during operation, improving the hydraulic efficiency, and greatly reducing the noise of the pump.

[0020] The rear section 5 of the blade of the present application retains a straight blade of about 1 / 4 of the blade length, ensuring good hydraulic performance after the impeller 8 diameter is cut.

[0021] The back of the blade of this application has a chamfered structure 6 (see Figure 4 ), reducing the resistance of the swirling liquid entering the impeller 8, increasing the flow rate of the impeller 8, allowing more liquid to circulate and pressurize through the impeller 8, and improving the hydraulic efficiency.

[0022] In a preferred embodiment, the diameter of the wheel body 1 is greater than 315 mm, and short blades 18 are provided between the blade rear sections 5 .

[0023] In a preferred embodiment, the short blade 18 is located at the outlet of the blade, and the short blade 18 is a straight blade segment.

[0024] It should be noted that for impellers with an impeller diameter greater than 315 mm, the inlet angle of the blades is not changed, and short blades 18 are added to the straight blade section at the blade outlet to reduce the vortex loss between the blades caused by the blades being far apart at the large diameter.

[0025] Furthermore, the inlet of the short blade 18 is inclined toward the back side of the blade.

[0026] It should be noted that the inlet of the short blade 18 is designed to be inclined toward the back of the blade, which effectively improves the reasonable distribution of the flow and makes the blade outlet pressure more evenly distributed; adding the short blade 7 effectively increases the pump head and improves the pump efficiency.

[0027] In one embodiment, the pump body 7 includes a volute diffuser section 14, a volute inlet section 15, a baffle 16 and a volute water pressure chamber section 17, a baffle 16 is provided between the volute diffuser section 14 and the volute water pressure chamber section 17; the radial diameter of the baffle 16 is D0; the radial diameter of the outlet of the volute water pressure chamber section 17 is D3; the ratio of D0 to D3 is within the range of 90%±3%; the pump body 7 adopts a semi-volute water pressure chamber; the volute water pressure chamber section 17 extends from the baffle 16 to within 180°; the volute water pressure chamber section 17 to the outlet of the volute diffuser section 14 is a circular water pressure chamber.

[0028] It should be noted that the design of the pump body 7 of the present application is to solve the problem that the outlet "partition tongue 16" of the circular water pressure chamber vortex chamber is not effective and does not play the role of separating and drawing out the liquid, and most of the liquid will continue to circulate in the pump body 7, causing energy loss. Secondly, it solves the problem that the vortex chamber circumferential dimension changes too much due to the large diffusion angle of the volute of the conventional pump body 7 at the partition tongue 16, which causes the vortex liquid to be lost when circulating in the pump body 7.

[0029] In one embodiment, the volute inlet section 15 adopts an inner diffusion inclination angle α and a large fillet angle R; the angle value of the inner diffusion inclination angle α is 2°~8°, and a larger value is selected for a large impeller diameter or a large flow rate; the large fillet angle R value is 50% of the pump body inlet diameter size.

[0030] It should be noted that the inlet section of the pump body 7 adopts an inner diffusion angle and a large fillet design, and the inner diffusion angle value is between 2° and 8°; the fillet R value is 50% of the inlet diameter of the pump body 7. For the same impeller 8 and pump body 7 matching design, the larger the value of the inlet diffusion angle α and the fillet R value of the pump body 7, the greater the flow rate of the pump's optimal efficiency point. Under the same flow rate, this application reduces the suction speed, improves the suction performance, and makes the pump have better cavitation performance, but the continued increase of α and R values ​​will reduce the head, so the design of the inlet DN can be changed according to the required pump parameters.

[0031] The design principle of this application is as follows: the impeller 8 of the pump is installed on the shaft, and the impeller 8 is placed on one side of the vortex chamber of the pump body 7 and has a large distance from the inlet side wall of the pump body 7, forming a flow passage. The pump is driven to rotate by a motor, and the liquid is accelerated through the impeller 8 to enter the volute flow passage during rotation. This part of the liquid has a large speed, and a part of the liquid at the inlet of the impeller 8 that is not accelerated by the impeller 8 will enter the impeller 8, filling the liquid space flowing to the edge of the impeller 8 due to the acceleration of the impeller 8 and the centrifugal force to form a local vortex. At the same time, the liquid rotates with the impeller 8 to form an overall vortex in the circumferential direction of the volute of the pump body 7. The liquid obtains energy in the process of continuous acceleration and circulation. A part of the liquid flows out from the pump outlet, and a part of the liquid continues to be accelerated in the volute in the form of a vortex. Therefore, the liquid in the vortex pump is also a process of repeated acceleration.

[0032] The impeller 8 adopts a back blade design, which can automatically discharge the particles with heavy specific gravity to the outer edge of the impeller 8 during the rotation process, preventing the back of the impeller 8 from being blocked due to too much solid content in the medium, and reducing the back pressure of the impeller 8 and the pressure of the sealing chamber; In addition, the pump adopts a secondary impeller 10 dynamic seal, which further lowers the sealing cavity and plays an isolating role so that the medium containing fine particles cannot enter the sealing cavity 11, thereby ensuring the service life of the mechanical seal 12.

[0033] In addition, the pump of the present application adopts a horizontal installation and a rear-pull structure, which is convenient for disassembling the rotor components for replacement and maintenance; the bearing component 13 adopts a universal standard design to improve the standardization of the pump; the standardization of the pump is improved through universal parts design and reasonable hydraulic planning.

[0034] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A cyclone pump, characterized in that: It includes a pump body, an impeller, an inner pump cover, an auxiliary impeller, a sealing cavity, a mechanical seal and a bearing component; the pump body and the bearing component are fixedly connected; the inner pump cover, the auxiliary impeller, the sealing cavity and the mechanical seal are sleeved on the impeller; one end of the auxiliary impeller is provided with an inner pump cover; the other end of the auxiliary impeller is provided with a sealing cavity; a mechanical seal is provided at the end of the sealing cavity away from the auxiliary impeller; the mechanical seal is placed in the bearing component; both sides of the inner pump cover are fixedly connected to the bearing component; both sides of the sealing cavity are fixedly connected to the bearing component.

2. The vortex pump according to claim 1, characterized in that: The impeller comprises a wheel body, a wheel shaft at the center of the wheel body and blades on the side of the wheel body, wherein the blades are sequentially composed of a front blade section, a middle blade section and a rear blade section; the inlet placement angle of the front blade section is θ; the outlet angle of the rear blade section is φ; the middle blade section transitions from the front blade section to the rear blade section; the blade angle of the middle blade section conforms to the relative flow inclination angle of the liquid; The inlet placement angle θ of the front section of the blade is in the range of 20-35°; the blade outlet angle φ of the rear section of the blade is 90°.

3. The vortex pump according to claim 2, characterized in that: The number of the blades is 8 or 12; the rear section of the blade is a straight blade; the straight blade starts to tilt at about 1 / 4 of the total length of the blade outlet; a chamfer is set on the back of the blade; the cross-section of the blade is a pentagon; the wheel body, the axle in the center of the wheel body and the blades on the side of the wheel body rotate counterclockwise.

4. The vortex pump according to claim 1, characterized in that: The diameter of the wheel body is greater than 315 mm, and short blades are arranged between the blade rear sections.

5. The swirl pump according to claim 4, characterized in that: The short blade is located at the outlet of the blade, and the short blade is a straight blade segment.

6. The swirl pump according to claim 4, characterized in that: The inlet of the short blade is inclined toward the back side of the blade.

7. The vortex pump according to claim 1, characterized in that: The pump body includes a volute diffuser section, a volute inlet section, a baffle and a volute water pressure chamber section, a baffle is provided between the volute diffuser section and the volute water pressure chamber section; the radial diameter of the baffle is D0; the radial diameter of the outlet of the volute water pressure chamber section is D3; the ratio of D0 to D3 is within the range of 90%±3%; the pump body adopts a semi-volute water pressure chamber; the volute water pressure chamber section extends from the baffle to within 180°; the volute water pressure chamber section to the outlet of the volute diffuser section is a circular water pressure chamber.

8. The swirl pump according to claim 4, characterized in that: The volute inlet section adopts an inner diffusion inclination angle α and a large fillet angle R; the angle value of the inner diffusion inclination angle α is 2°~8°; the value of the large fillet angle R is 50% of the pump body inlet diameter size.

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