Single-stage centrifugal pump
The flow rate is adjusted by a single-stage centrifugal pump with replaceable inner volute, which solves the vibration caused by flow head changes and equipment damage, achieving efficient and stable operation and reducing operating costs.
Patent Information
- Application Number
- CN202422497522.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-16
AI Technical Summary
When the flow head changes beyond the allowable working range, existing single-stage centrifugal pumps are prone to vibration, resulting in waste of electricity and equipment damage, and the replacement operation is cumbersome and not highly versatile.
A single-stage centrifugal pump that can replace the inner volute is designed to adjust the flow rate by replacing the number of blades and overflow area of the inner volute, keeping the head unchanged, balancing the radial force, and reducing vibration.
It realizes efficient operation when flow changes, reduces operating costs and vibration, and improves equipment versatility and operation stability.
Smart Images
Figure CN223062655U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a single-stage centrifugal pump. Background Art
[0002] As a general-purpose machine for fluid transportation, centrifugal pumps are widely used in various fields such as petroleum, chemical industry, power stations, municipal engineering, environmental protection, and metallurgy. And single-stage centrifugal pumps have a very wide range of applications due to their simple and compact structure and large coverage range of flow and head. The key data of parameters such as the flow rate and head of a centrifugal pump are affected by the size of the impeller inlet diameter, the width of the impeller outlet opening, the size of the impeller outer diameter, the size of the pump body volute, etc. When designing a centrifugal pump, usually a flow rate and head are selected first, and then the impeller and volute are designed. If the operating parameters of the flow rate and head at the customer's site change and exceed the allowable working range of the centrifugal pump, if the centrifugal pump continues to be used, the result will often be an increase in the vibration of the pump. At the same time, the operating area of the centrifugal pump is outside the high-efficiency area, resulting in a waste of electric energy. If it is in this operating state for a long time, the pump will surely malfunction and be damaged.
[0003] If the change range of the flow rate and head exceeds the allowable working range of the pump, a new pump needs to be designed. This will surely require designing multiple models of centrifugal pumps and developing a set of hydraulic models and molds again, with low versatility. And it is necessary to replace the entire centrifugal pump and reinstall the entire pump equipment unit, which is also very troublesome in operation. Therefore, the technicians in this field propose a single-stage centrifugal pump to solve the above problems. Content of the Utility Model
[0004] In order to make up for the above deficiencies, the utility model provides a single-stage centrifugal pump, aiming to improve the problem that when the operating parameters of the customer change, it is necessary to disassemble and replace the entire centrifugal pump, resulting in a reduction in work efficiency due to shutdown and replacement.
[0005] To achieve the above object, the utility model provides the following technical solution: A single-stage centrifugal pump includes a pump body, a rotating assembly, a positioning assembly, and a sealing assembly. The positioning assembly is installed at the center of the pump body. The rotating assembly is installed inside the positioning assembly. The sealing assembly is located outside the positioning assembly. A pump cover is arranged on the outside of the pump body. A mechanical seal sealing component is arranged on the outer surface of the pump cover. The outside of the mechanical seal sealing component is attached to the outside of the rotating assembly. An inner volute is installed inside the pump cover. A plurality of blades are arranged inside the inner volute.
[0006] The positioning assembly includes a bearing housing. The bearing housing is fixedly connected to the outside of the pump cover through a stud bolt. A rear bearing gland is fixedly connected to one side inside the bearing housing. A front bearing gland is fixedly connected to the other side inside the bearing housing.
[0007] Further, the rotating assembly includes a pump shaft rotatably connected inside a bearing housing. A front bearing is installed at one end of the pump shaft, and a rear bearing is installed at the other end of the pump shaft.
[0008] Further, the outer sides of the front bearing and the pump shaft are fixedly connected to the inner sides of a rear bearing gland and a front bearing gland.
[0009] Further, a spacer sleeve and an impeller are sleeved outside the pump shaft, and an impeller nut is threadedly connected to the inner sides of the spacer sleeve and the impeller.
[0010] Further, the sealing assembly includes an impeller seal ring and a housing seal ring. The impeller seal ring is arranged outside the impeller, and the housing seal ring is fixedly connected to the outside of the pump body.
[0011] Further, a rear dust shield is arranged inside the rear bearing gland, and the outer side of the pump shaft is rotatably connected to the inner side of the rear dust shield.
[0012] Further, a plurality of the vanes are evenly distributed inside the inner volute, and the number of the vanes is 8 - 20.
[0013] The utility model has the following beneficial effects:
[0014] In the utility model, the centrifugal pump is provided with a replaceable inner volute. When the operating parameters of a customer change and exceed the allowable working range of the pump, by replacing the inner volute, the operating parameters of the pump can be made to be within the allowable working range, and at the same time, the pump operates in the high-efficiency zone. At the same time, since a plurality of vanes are evenly arranged in the inner volute, when the pump works, the medium conveyed by the pump evenly passes through each vane, which well balances the radial force of the pump, reduces the vibration of the pump, and makes the pump operate more smoothly. The problem can be solved by selecting to replace the inner volute according to the actual required flow rate, which greatly reduces the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a sectional view of a single-stage centrifugal pump proposed by the utility model;
[0016] Figure 2 is a sectional view of the inner volute of a single-stage centrifugal pump proposed by the utility model;
[0017] Figure 3 is a schematic structural view of the inner volute of a single-stage centrifugal pump proposed by the utility model.
[0018] LEGEND DESCRIPTION:
[0019] 1. Pump body; 2. Impeller nut; 3. Impeller; 4. Inner volute; 5. Pump cover; 6. Mechanical seal component; 7. Front bearing gland; 8. Front bearing; 9. Pump shaft; 10. Rear bearing; 11. Bearing housing; 12. Rear bearing gland; 13. Rear dust cover; 14. Splash ring; 15. Front dust cover; 16. Sleeve; 17. Housing seal ring; 18. Impeller seal ring; 19. Vane. Detailed implementation manner
[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] Refer to Figures 1-3 As shown in the figure, an embodiment provided by the present invention: a single-stage centrifugal pump includes a pump body 1, a rotating assembly, a positioning assembly, and a sealing assembly. The positioning assembly is installed at the center of the pump body 1. The rotating assembly is installed inside the positioning assembly. The sealing assembly is located outside the positioning assembly. A pump cover 5 is arranged on the outside of the pump body 1. A mechanical seal component 6 is arranged on the outer surface of the pump cover 5. The outside of the mechanical seal component 6 is in contact with the outside of the rotating assembly. An inner volute 4 is installed inside the pump cover 5. A plurality of vanes 19 are arranged inside the inner volute 4.
[0022] The positioning assembly includes a bearing housing 11. The bearing housing 11 is fixedly connected to the outside of the pump cover 5 by through bolts. A rear bearing gland 12 is fixedly connected to one side inside the bearing housing 11. A front bearing gland 7 is fixedly connected to the other side inside the bearing housing 11.
[0023] Specifically, a front bearing 8 and a rear bearing 10 are installed on the pump shaft 9. After being combined, they are installed inside the bearing housing 11. Then, they are positioned inside the bearing housing 11 through the front bearing gland 7 and the rear bearing gland 12. A mechanical seal component 6 is installed on the pump cover 5. The combination is combined with the bearing housing 11 through stud bolts. An inner volute 4 is installed on the pump cover 5. A sleeve 16 and an impeller 3 are installed on the pump shaft 9. The impeller 3 is fixed on the pump shaft by tightening the impeller nut 2. An impeller seal ring 18 is installed on the impeller 3. A housing seal ring 17 is installed on the pump body 1. Among them, a plurality of vanes 19 are evenly arranged on the inner volute 4. The medium conveyed by the pump flows out from the impeller outlet due to the centrifugal force and then enters the inner volute. The medium flows out from between the vanes 19 arranged on the inner volute and enters the pump body, and then is discharged through the pump body. The number of vanes 19 on the inner volute 4 can be arranged in a structure with few vanes and many vanes.
[0024] Refer to Figures 1-3, the rotating assembly includes a pump shaft 9 which is rotatably connected inside a bearing housing 11. A front bearing 8 is installed at one end of the pump shaft 9, and a rear bearing 10 is installed at the other end of the pump shaft 9. The outer sides of the front bearing 8 and the pump shaft 9 are fixedly connected to the inner sides of a rear bearing gland 12 and a front bearing gland 7. The sealing assembly includes an impeller seal ring 18 and a housing seal ring 17. The impeller seal ring 18 is arranged outside the impeller 3, and the housing seal ring 17 is fixedly connected to the outside of the pump body 1. A rear dust cover 13 is arranged inside the rear bearing gland 12, and the outer side of the pump shaft 9 is rotatably connected to the inner side of the rear dust cover 13. A plurality of vanes 19 are evenly distributed inside the inner volute 4, and the number of vanes 19 is 8 - 20.
[0025] Specifically, the inner volute 4 is a replaceable part. When the flow rate of the pump is large during operation, an inner volute 4 with a small number of vanes 19 can be selected. Since the distance between two adjacent vanes 19 is large and the flow area is large, the flow rate passing through is usually larger. When the flow rate of the pump is small during operation, an inner volute 4 with a large number of vanes 19 can be selected. Since the distance between two adjacent vanes 19 is small and the flow area is small, the flow rate passing through is also small. At the same time, when an inner volute 4 with a large number of vanes 19 is adopted, the high-efficiency region of the pump operation will shift towards the small flow rate direction accordingly, ensuring that it can work in the high-efficiency region and reducing energy consumption. At the same time, since the head of the pump is determined by the outer diameter of the impeller 3, when different inner volutes 4 are replaced, the head of the pump remains unchanged. When the customer needs to adjust the flow rate of the pump due to various reasons on site, the inner volute 4 can be selected and replaced according to the adjusted actual flow rate instead of replacing the whole pump, which greatly reduces the use cost.
[0026] Working principle: Generally, the flow rate and high-efficiency region of the pump are affected by the inlet and outlet widths of the impeller 3 and the flow area of the volute. When the size of the impeller 3 is fixed, changing the flow area of the inner volute 4 will change the pump flow rate discharged from the pump body 1. When the flow area of the inner volute 4 is large, the flow rate usually discharged through the pump body 1 will be larger, and the high-efficiency region of the corresponding pump will also move towards the large flow rate direction. On the contrary, when the flow area of the inner volute 4 decreases, the flow rate discharged through the pump body 1 will be smaller, and the high-efficiency region of the corresponding pump will also move towards the small flow rate direction. When a larger flow rate needs to be discharged by the pump, an inner volute 4 with a large flow area is replaced, and the number of vanes 19 is relatively small. When a smaller flow rate needs to be discharged by the pump, an inner volute 4 with a small flow area is replaced, and the number of vanes 19 is relatively large. Since the impeller 3 is not replaced during this replacement process, the head of the pump remains unchanged. Generally, the head of the pump is affected by the diameter of the impeller 3.
[0027] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A single-stage centrifugal pump, comprising a pump body (1), a rotating assembly, a positioning assembly and a sealing assembly, characterized in that: The positioning component is installed at the center of the pump body (1). The rotating component is installed inside the positioning component. The sealing component is located outside the positioning component. A pump cover (5) is arranged on the outer side of the pump body (1). A mechanical seal component (6) is arranged on the outer surface of the pump cover (5). The outer side of the mechanical seal component (6) is attached to the outside of the rotating component. An inner volute (4) is installed inside the pump cover (5). A plurality of vanes (19) are arranged inside the inner volute (4). The positioning component includes a bearing housing (11). The bearing housing (11) is fixedly connected to the outside of the pump cover (5) by through bolts. A rear bearing gland (12) is fixedly connected to one side inside the bearing housing (11). A front bearing gland (7) is fixedly connected to the other side inside the bearing housing (11).
2. The single-stage centrifugal pump according to claim 1, characterized in that: The rotating component includes a pump shaft (9). The pump shaft (9) is rotatably connected inside the bearing housing (11). A front bearing (8) is installed at one end of the pump shaft (9). A rear bearing (10) is installed at the other end of the pump shaft (9).
3. A single-stage centrifugal pump according to claim 2, characterized in that: The outer sides of the front bearing (8) and the pump shaft (9) are fixedly connected to the inner sides of the rear bearing gland (12) and the front bearing gland (7).
4. A single-stage centrifugal pump according to claim 2, characterized in that: A spacer sleeve (16) and an impeller (3) are sleeved on the outside of the pump shaft (9). The spacer sleeve (16) and the impeller (3) are threadedly connected with an impeller nut (2) on the inner side.
5. A single-stage centrifugal pump according to claim 1, characterized in that: The sealing component includes an impeller seal ring (18) and a housing seal ring (17). The impeller seal ring (18) is arranged on the outside of the impeller (3). The housing seal ring (17) is fixedly connected to the outside of the pump body (1).
6. A single-stage centrifugal pump according to claim 2, characterized in that: A rear dust shield (13) is arranged on the inner side of the rear bearing gland (12). The outside of the pump shaft (9) is rotatably connected to the inner side of the rear dust shield (13).
7. A single-stage centrifugal pump according to claim 1, characterized in that: A plurality of the vanes (19) are evenly distributed inside the inner volute (4). The number of the vanes (19) is 8 - 20.