Shield pump with balanced axial force
By employing oppositely arranged impellers and vanes in the screen pump, axial forces are balanced, enabling the pump to operate efficiently at higher flow rates and lift, thus extending its lifespan and reducing maintenance.
Patent Information
- Application Number
- CN202422278345.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The existing shielding pumps are subjected to excessive axial force under high flow and high lift, resulting in increased wear and even rupture, affecting service life.
The combination structure of the positive and reverse guide vanes is adopted. The positive and reverse impellers rotate in the same direction, and the opposite axial forces cancel each other. Combined with the crowded fluid structure, the inner cavity and drainage are separated to achieve axial force balance.
Under high flow and head conditions, the bearing force of the shielding pump is within the bearable range, extending its service life, simple structure, low cost and easy installation.
Smart Images
Figure CN223104847U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of canned pumps, and specifically relates to a canned pump with axial force balance. Background Art
[0002] With the development of canned motor technology, canned motors have been widely used in various industries. When applied to the manufacture of pumps, canned pumps are formed. The pump body and the motor of the canned pump are both sealed in a pressure vessel filled with the pumped medium, and can achieve complete leakage-free. However, the requirements for the flow and head of the canned pump are even higher. The diffusers and impellers of the existing canned pumps are arranged in the same direction. As the flow and head increase, it means that the axial force on the shaft of the canned pump becomes larger, which will lead to increased bearing wear and even bearing rupture, affecting the service life of the canned pump. If the canned pump is to be used in a high-head operating environment, the excessive axial force is a factor that has to be considered. Summary of the Invention
[0003] In order to overcome the deficiencies of the prior art, the utility model provides a canned pump with axial force balance, which is provided with a positive diffuser and a positive impeller group and a corresponding negative diffuser and a negative impeller group. When the pump works, the two impellers rotate in the same direction, and the diffuser plays a guiding role. Due to the opposite installation between the impellers, an axial force originally acting on the shaft becomes two axial forces in opposite directions, and the axial forces cancel each other out. The canned pump will not face the problem of excessive axial force, so the service life is extended. In addition, the utility model is also equipped with a current collector structure to play a role in separating the inner cavity and guiding the flow.
[0004] To achieve the above purpose, a canned pump with axial force balance is designed, including a canned pump. The canned pump includes a pump body, a shaft, a lower pressure-resistant cylinder, a current collector, an upper pressure-resistant cylinder, a pump cover, a canned motor, a positive impeller, a negative impeller, a positive diffuser, and a negative diffuser. The lower pressure-resistant cylinder, the current collector, the upper pressure-resistant cylinder, and the pump cover are sequentially connected above the pump body. A canned motor is arranged in the sealing cavity above the pump cover. One end of the shaft is connected to the canned motor, and the other end of the shaft passes through the current collector and is inserted into the pump body. A positive impeller, a positive diffuser, the current collector, a negative diffuser, and a negative impeller are sequentially sleeved on the shaft from bottom to top. The water inlet body is connected above the negative impeller. The current collector includes an inclined structure, an annular flow channel, and a water passing port. The structure of the current collector is a cylinder. Annular flow channels are respectively arranged on the upper and lower surfaces of the current collector. Three water passing ports are arranged in the annular flow channel, and the upper and lower water passing ports are connected by the inclined structure.
[0005] The positive diffuser includes a diffuser housing, a diffuser seat, and diffuser vanes. The diffuser seat is sleeved at the lower end of the diffuser housing. Diffuser vanes are arranged in the diffuser housing. A diffuser cover plate is connected above the diffuser vanes. The structure of the negative diffuser is the same as that of the positive diffuser, and the installation method is symmetric.
[0006] The water inlet body has a hollow cylinder structure, and there are through holes II on both sides of the water inlet body.
[0007] A through hole one for the shaft to pass through is provided on the current collector.
[0008] A water inlet is provided on the left side of the pump body, and a water outlet is provided on the right side of the pump body.
[0009] Pull rods are respectively provided on the left and right sides of the pump cover of the pump body.
[0010] The positive impeller is fixed on the shaft by screws.
[0011] The positive guide vane and the reverse guide vane are respectively fixed on the shaft by guide bearings.
[0012] Compared with the prior art, the utility model can bear a greater axial force in the working environment of high flow rate and head, improve the service life of the canned motor pump, has a simple structure, low manufacturing cost, is convenient for installation and easy to operate for technicians. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic cross-sectional view of the utility model.
[0014] Figure 2 It is a schematic diagram of the medium flow direction of the utility model.
[0015] Figure 3 It is an isometric view of the current collector.
[0016] Figure 4 It is a cross-sectional view of the current collector.
[0017] Figure 5 It is a partial enlarged view of the structure of the reverse guide vane and the reverse impeller.
[0018] Figure 6 It is a schematic diagram of the guide vane.
[0019] Figure 7 It is a cross-sectional view of the guide vane.
[0020] See Figures 1 to 7 , 1 is the pump body, 2 is the lower pressure-resistant cylinder, 3 is the current collector, 3.1 is the inclined structure, 3.2 is the annular flow channel, 3.3 is the water passing port, 3.4 is the through hole one, 4 is the upper pressure-resistant cylinder, 5 is the pump cover, 6 is the pull rod, 7 is the canned motor, 8 is the screw, 9 is the shaft, 10 is the positive impeller, 11 is the positive guide vane, 11.1 is the guide vane housing, 11.2 is the guide vane seat, 11.3 is the guide vane blade, 11.4 is the guide vane cover plate, 12 is the reverse guide vane, 13 is the reverse impeller, 14 is the water inlet body, 14.1 is the through hole two, 15 is the guide bearing, 16 is the water inlet, 17 is the water outlet, 18 is the sealing cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The following further describes the present utility model with reference to the accompanying drawings.
[0022] As Figure 1 shown, the canned motor pump includes a pump body 1, a shaft 9, a lower pressure-resistant cylinder 2, a collector 3, an upper pressure-resistant cylinder 4, a pump cover 5, a canned motor 7, a positive impeller 10, a negative impeller 13, a positive diffuser 11, and a negative diffuser 12. Above the pump body 1 are sequentially connected the lower pressure-resistant cylinder 2, the collector 3, the upper pressure-resistant cylinder 4, and the pump cover 5. In the sealing cavity 18 above the pump cover 5 is provided a canned motor 7, which drives the rotation of the shaft 9 and is applicable to occasions with high precision, low noise, and high-speed stability. One end of the canned motor 7 is connected to the shaft 9, and the other end of the shaft 9 passes through the collector 3 and inserts into the pump body 1. On the shaft 9, from bottom to top, are sleeved in sequence the positive impeller 10, the positive diffuser 11, the collector 3, the negative diffuser 12, and the negative impeller 13. Above the negative impeller 13 is connected an inlet body 14. As Figure 3 、 Figure 4 shown, the collector 3 includes an inclined structure 3.1, an annular flow channel 3.2, and a water passing port 3.3. The structure of the collector 3 is a cylinder. Annular flow channels 3.2 are respectively provided on the upper and lower surfaces of the collector 3. Three water passing ports 3.3 are provided in the annular flow channel 3.2. The upper and lower water passing ports 3.3 are connected by the inclined structure 3.1. The collector 3 divides the entire pump structure into two flow channel cavities, which are respectively an outer flow channel cavity composed of the pump body 1, the lower pressure-resistant cylinder 2, the annular flow channel 3.2 on the lower surface of the collector 3, the upper pressure-resistant cylinder 4, and the pump cover 5, and an inner flow channel cavity composed of the pump body 1, the positive diffuser 11, the annular flow channel 3.2 on the upper surface of the collector 3, the negative diffuser 12, and the inlet body 14. As Figure 2 is a schematic diagram of the medium flow direction.
[0023] As Figure 6 、 Figure 7 shown, the positive diffuser 11 includes a diffuser housing 11.1, a diffuser seat 11.2, and diffuser vanes 11.3. The diffuser seat 11.2 is sleeved at the lower end of the diffuser housing 11.1. Diffuser vanes 11.3 are provided in the diffuser housing 11.1. Above the diffuser vanes 11.3 is connected a diffuser cover plate 11.4. The structure of the negative diffuser 12 is the same as that of the positive diffuser 11, and the installation method is symmetric. The positive diffuser 11 and the negative diffuser 12 play a guiding role. The positive impeller 10 and the negative impeller 13 generate opposite axial forces, which cancel each other out, achieving the balance of the axial force and ensuring that the force received by the bearings of the canned motor is within the strength bearing range.
[0024] As Figure 5 shown, the structure of the inlet body 14 is a hollow cylinder. There are through holes two 14.1 on both sides of the inlet body 14. The medium flows into the inlet body 14 from the through holes two 14.1 on both sides and then flows into the negative impeller 13.
[0025] The collector is provided with a through hole one 3.4 for the shaft 9 to pass through.
[0026] The left side of the pump body 1 is provided with a water inlet 16, and the right side of the pump body 1 is provided with a water outlet 17. The structure is simple and the installation is convenient.
[0027] On the left and right sides of the pump cover 5 of the pump body 1, pull rods 6 are respectively provided. The pull rods 6 play a role in fixing the whole pump, connecting the pump body 1, the lower pressure-resistant cylinder 2, the current collector 3, the upper pressure-resistant cylinder 4, and the pump cover 5 into a sealed outer flow channel cavity, and connecting the pump body 1, the positive guide vane 11, the current collector 3, the negative guide vane 12, and the water inlet body 14 into a sealed inner flow channel cavity, further sealing the pump and ensuring the normal operation of the pump.
[0028] The positive impeller 10 is fixed on the shaft 9 by screws 8.
[0029] The positive guide vane 11 and the negative guide vane 12 are respectively fixed on the shaft 9 through guide bearings 15.
[0030] The specific implementation process of the present utility model is as follows: Start the canned motor 7, the shaft 9 rotates, the shaft 9 drives the positive impeller 10 and the negative impeller 13 to rotate. The impellers provide the kinetic energy for the water to advance in the pump. For example, Figure 2 , the medium enters the canned pump from the water inlet 16, flows along the positive impeller 10 and the positive guide vane 11 and enters the annular flow channel 3.2 on the lower surface of the current collector 3 from the side wall of the upper pressure-resistant cylinder 4, enters the water inlet body 1 through the through hole two 14.1 of the water inlet body 14 from the upper pressure-resistant cylinder 4, flows into the inner flow channel cavity along the negative impeller 13 and the negative guide vane 12, and the medium liquid flows out from the water outlet 17 on one side of the lower pressure-resistant cylinder 2. During the whole process, the positive impeller 10 and the negative impeller 13 rotate in the same direction. However, due to the symmetrical arrangement, the bending angles of the respective guide vanes 11.3 of the positive guide vane 11 and the negative guide vane 12 are opposite. The acting forces received by the positive impeller 10 and the negative impeller 13 are opposite, and the reaction forces of the positive impeller 10 and the negative impeller 13 on the water are also opposite, that is, the axial forces are opposite. The positive impeller 10 and the negative impeller 13 have opposite and approximately the same axial forces, and the two axial forces cancel each other out, realizing axial force self-balancing and being able to handle higher flow rates and head.
Claims
1. A canned motor pump with axial force balance, including a canned motor pump, characterized in that: The canned motor pump described above includes a pump body (1), a shaft (9), a lower pressure-resistant cylinder (2), a collector (3), an upper pressure-resistant cylinder (4), a pump cover (5), a canned motor (7), a positive impeller (10), a negative impeller (13), a positive diffuser (11), and a negative diffuser (12). Above the pump body (1), the lower pressure-resistant cylinder (2), the collector (3), the upper pressure-resistant cylinder (4), and the pump cover (5) are sequentially connected. In the sealing cavity (18) above the pump cover (5), there is a canned motor (7). One end of the shaft (9) is connected to the canned motor (7). The other end of the shaft (9) passes through the collector (3) and inserts into the pump body (1). The positive impeller (10), the positive diffuser (11), the collector (3), the negative diffuser (12), and the negative impeller (13) are sequentially sleeved on the shaft (9) from bottom to top. Above the negative impeller (13), there is an inlet body (14) connected. The collector (3) includes an inclined structure (3.1), an annular flow channel (3.2), and a water passing opening (3.3). The structure of the collector (3) is a cylinder. Annular flow channels (3.2) are respectively arranged on the upper and lower surfaces of the collector (3). Three water passing openings (3.3) are arranged in the annular flow channel (3.2). The upper and lower water passing openings (3.3) are connected by the inclined structure (3.1).
2. The canned motor pump with axial force balance according to claim 1, characterized in that: The positive diffuser (11) includes a diffuser housing (11.1), a diffuser seat (11.2), and diffuser vanes (11.3). The diffuser seat (11.2) is sleeved at the lower end of the diffuser housing (11.1). Diffuser vanes (11.3) are arranged in the diffuser housing (11.1). Above the diffuser vanes (11.3), there is a diffuser cover plate (11.4) connected. The structure of the negative diffuser (12) is the same as that of the positive diffuser (11), and the installation method is symmetric.
3. The canned motor pump with axial force balance according to claim 1, wherein: The structure of the inlet body (14) is a hollow cylinder, and there are through holes two (14.1) on both sides of the inlet body (14).
4. The canned motor pump with axial force balance according to claim 1, wherein: The collector is provided with a through hole one (3.4) for the shaft (9) to pass through.
5. The canned motor pump with axial force balance according to claim 1, wherein: The inlet (16) is arranged on the left side of the pump body (1), and the outlet (17) is arranged on the right side of the pump body (1).
6. The canned motor pump with axial force balance according to claim 1, characterized in that: Pull rods (6) are respectively arranged on the left and right sides of the pump cover (5) of the pump body (1).
7. The canned motor pump with axial force balance according to claim 1, characterized in that: The positive impeller (10) is connected to the shaft (9) by screws (8).
8. The canned motor pump with axial force balance according to claim 1, characterized in that: The positive diffuser (11) and the negative diffuser (12) are respectively fixed on the shaft (9) by guide bearings (15).