Self-priming centrifugal pump

Abstract

The utility model relates to the technical field of fluid conveying, in particular to a self-priming centrifugal pump. Comprising a bottom plate, a motor and a centrifugal pump body are fixed to the upper end of the bottom plate, a shell is fixed to the bottom plate, the lower end of the shell fixedly communicates with a communicating pipe, the communicating pipe communicates with the inlet end of the centrifugal pump body, one side of the upper end of the shell fixedly communicates with an inlet pipe, and the outlet end of the inlet pipe is located in the shell; the upper end of the shell is detachably, fixedly and hermetically connected with a cover plate for blocking the slotted hole, two lug plates are fixed at the lower end of the cover plate, a sealing plate is rotatably arranged between the two lug plates, the upper end of the sealing plate is connected with the upper end of the inlet pipe part in the shell through an elastic sheet, and the sealing plate seals and blocks the outlet end of the inlet pipe through a sealing ring. After the centrifugal pump body stops pumping, the elastic piece can enable the sealing plate to quickly seal the outlet end of the inlet pipe, fluid in the shell can be prevented from flowing back through the inlet pipe, and the amount of the fluid in the shell and the pump cavity of the centrifugal pump body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid transportation, in particular to a self-priming centrifugal pump. Background Art

[0002] Ordinary centrifugal pumps do not have self-priming function. To ensure the normal operation of the centrifugal pump, the water inlet pipe and the pump need to be filled with liquid. When the impeller is higher than the suction liquid level, the commonly used methods are: filling the pump and the water inlet pipe with liquid before each start-up. Therefore, when using an ordinary centrifugal pump for fluid transportation, the workload is increased, the start-up time is increased, and it is not conducive to remote automatic control. Using a vacuum pump to discharge the gas in the water inlet pipe and the pump, this method has a high equipment cost, complex operation, and a large maintenance workload.

[0003] The patent document with the publication number of CN221322733U discloses a centrifugal pump with self-priming function. It realizes the self-priming function by setting a self-priming chamber and a check valve, so that only the pump casing of the centrifugal pump needs to be filled with water before the first start-up, and the water inlet pipe does not need to be filled with water, with less workload and short start-up time; the self-priming shell is arranged outside the centrifugal pump casing, and the self-priming shell and the centrifugal pump casing are of a split structure, with low casting difficulty and low cost for the centrifugal pump casing and the self-priming shell. However, the check valve structure of this centrifugal pump with self-priming function includes a rubber sheet seat arranged between the self-priming shell and the self-priming cover, a rubber valve sheet covering the water inlet, and a rubber connecting block connecting the rubber sheet seat and the rubber valve sheet. The rubber connecting block is arranged above the rubber valve sheet, and a metal sheet core is embedded in the rubber valve sheet. When the centrifugal pump is working, the fluid will impact the rubber valve sheet. Since the hardness and anti-impact performance of the rubber valve sheet are weak, the rubber valve sheet is easily damaged or deformed after long-term use. At the same time, the rubber valve sheet is also prone to the situation of poor sealing of the water inlet, and the fluid in the self-priming chamber is likely to flow back after the pump stops, thereby losing the self-priming function. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is a centrifugal pump with good sealing effect on the inlet pipe after the pump stops, which can prevent the fluid in the casing from flowing out and ensure the self-priming function.

[0005] In order to achieve the above object, the technical solution provided by the utility model is:

[0006] A self-priming centrifugal pump, comprising a bottom plate, an electric motor and a centrifugal pump body are fixedly arranged at the upper end of the bottom plate, the electric motor is used to drive the rotation of the rotating shaft of the centrifugal pump body, a housing is fixedly arranged on the bottom plate, a communicating pipe is fixedly connected to the lower end of the housing, the communicating pipe is communicated with the inlet end of the centrifugal pump body, a feed pipe is fixedly connected to one side of the upper end of the housing, the outlet end of the feed pipe is located inside the housing, a slot hole is formed in the upper end of the housing, a cover plate for plugging the slot hole is detachably and fixedly sealed and connected to the upper end of the housing, two ear plates are fixedly arranged at the lower end of the cover plate, the part of the feed pipe inside the housing is located between the two ear plates, a sealing plate is rotatably arranged between the two ear plates, the upper end of the sealing plate is connected to the upper end of the part of the feed pipe inside the housing through an elastic sheet, a sealing groove is formed in one end of the feed pipe inside the housing, a sealing ring is installed in the sealing groove, and the sealing plate seals the outlet end of the feed pipe through the sealing ring. After the fluid in the feed pipe impacts the sealing plate, the sealing plate can be rotated, the elastic sheet deforms elastically when the sealing plate rotates, and the fluid can enter the housing after the sealing plate rotates. After the centrifugal pump body stops rotating, the sealing plate rotates back to its original position and seals the outlet end of the feed pipe under the elastic action of the elastic sheet.

[0007] Specifically, the sealing plate is a metal plate, and the sealing plate is rotatably connected to the ear plate through a rotating rod.

[0008] Specifically, a coupling is fixedly arranged on the bottom plate, and the output shaft of the electric motor is connected to the rotating shaft of the centrifugal pump body through the coupling.

[0009] Specifically, a support plate is fixedly arranged at the lower end of the housing, and the support plate is fixedly connected to the bottom plate.

[0010] Specifically, a plurality of vertical insertion rods are fixedly arranged at the lower end of the cover plate, insertion holes concentric with the insertion rods are formed in the upper end of the housing, and the insertion rods are inserted into the insertion holes to position the cover plate.

[0011] Specifically, a rubber pad is fixedly arranged at the lower end of the cover plate, the cover plate is hermetically connected to the upper end of the housing through the rubber pad, and the cover plate and the upper end of the housing are connected through a plurality of bolts.

[0012] Specifically, a filling pipe is fixedly connected to the upper end of the housing, and a cap is detachably and fixedly sealed and connected to the filling pipe.

[0013] Specifically, one end of the elastic sheet is fixedly connected to the upper end of the sealing plate, the lower end of the elastic sheet bends upward to form a bending part, an arc-shaped groove is formed in the lower end of the bending part, and the upper end of the part of the feed pipe inside the housing is slidably clamped in the arc-shaped groove.

[0014] Specifically, the two ear plates are fixedly connected through a stop rod, the upper end of the sealing plate is located between the elastic sheet and the stop rod, and the stop rod can limit the rotation angle of the sealing plate.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] 1. By setting the elastic piece, after the centrifugal pump body stops pumping, the elastic piece can enable the sealing plate to quickly block the outlet end of the inlet pipe, preventing the fluid in the housing from flowing back through the inlet pipe, ensuring the amount of fluid in the housing and the pump chamber of the centrifugal pump body, and thus ensuring the self-priming function of the centrifugal pump body.

[0017] 2. By setting the stop rod, the stop rod can limit the rotation angle of the sealing plate. When the fluid in the inlet pipe impacts the sealing plate, it can prevent the sealing plate from causing the deformation amount of the elastic piece to exceed its maximum deformation amount due to excessive rotation angle, effectively protecting the elastic piece.

[0018] 3. An arc-shaped groove is opened at the lower end of the bent part of the elastic piece, and the upper end of the inlet pipe part in the housing is slidably clamped in the arc-shaped groove. During the deformation process of the elastic piece, the bent part at its lower end can always tightly abut against the upper end of the inlet pipe part in the housing, improving the stability when the elastic piece deforms.

[0019] 4. The sealing plate can be taken out by opening the cover plate, which is convenient for replacing the sealing plate and the sealing ring at the same time. The sealing ring is located in the sealing groove, which can prevent the fluid from scouring the sealing ring for a long time and reducing its service life. It can improve the maintenance cycle and reduce the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the present utility model.

[0021] Figure 2 is a schematic diagram of the internal structure of the housing.

[0022] Figure 3 is a schematic diagram of the housing.

[0023] Figure 4 is a top view of the housing.

[0024] Figure 5 is Figure 4 the sectional view taken along the line A-A in

[0025] Figure 6 is a schematic diagram of the connection between the sealing plate and the elastic piece.

[0026] The part names in the drawings are: 1. bottom plate, 2. centrifugal pump body, 3. motor, 4. coupling, 5. housing, 6. support plate, 7. inlet pipe, 8. connecting pipe, 9. cover plate, 10. insertion rod, 11. insertion hole, 12. bolt, 13. ear plate, 14. rotating rod, 15. sealing plate, 16. sealing ring, 17. elastic piece, 18. filling pipe, 19. slot hole, 20. arc-shaped groove, 21. stop rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0028] Embodiment 1: Refer to Figures 1-6 As shown, a self-priming centrifugal pump includes a bottom plate 1, on the upper end of the bottom plate 1, a motor 3 and a centrifugal pump body 2 are fixed. A coupling 4 is fixed on the bottom plate 1, and the output shaft of the motor 3 is connected to the rotating shaft of the centrifugal pump body 2 through the coupling 4.

[0029] A housing 5 is fixed on the bottom plate 1. Specifically, a support plate 6 is fixed at the lower end of the housing 5, and the support plate 6 is fixedly connected to the bottom plate 1.

[0030] A communicating pipe 8 is fixedly connected to the lower end of the housing 5 in a communicating manner, and the communicating pipe 8 is communicated with the inlet end of the centrifugal pump body 2. A feed pipe 7 is fixedly connected to one side of the upper end of the housing 5 in a communicating manner, and the outlet end of the feed pipe 7 is located inside the housing 5.

[0031] A filling pipe 18 is fixedly connected to the upper end of the housing 5 in a communicating manner, and a cap is detachably and fixedly sealedly connected to the filling pipe 18. Before the centrifugal pump body 2 is started for the first time, the cap is opened, and fluid can be filled into the housing 5 through the filling pipe 18.

[0032] A slot hole 19 is opened at the upper end of the housing 5, and a cover plate 9 for blocking the slot hole 19 is detachably and fixedly sealedly connected to the upper end of the housing 5. A plurality of vertical insertion rods 10 are fixed to the lower end of the cover plate 9, and insertion holes 11 concentric with the insertion rods 10 are opened at the upper end of the housing 5, and the insertion rods 10 are inserted into the insertion holes 11 to position the cover plate 9.

[0033] A rubber pad is fixed to the lower end of the cover plate 9, and the cover plate 9 is sealedly connected to the upper end of the housing 5 through the rubber pad. The cover plate 9 and the upper end of the housing 5 are connected by a plurality of bolts 12.

[0034] Two ear plates 13 are fixed to the lower end of the cover plate 9. A part of the feed pipe 7 inside the housing 5 is located between the two ear plates 13, and a sealing plate 15 is rotatably arranged between the two ear plates 13. Specifically, the sealing plate 15 is a metal plate, and the sealing plate 15 is rotatably connected to the ear plates 13 through a rotating rod 14.

[0035] The upper end of the sealing plate 15 is connected to the upper end of a part of the feed pipe 7 inside the housing 5 through an elastic piece 17.

[0036] A sealing groove is opened at one end of the feed pipe 7 inside the housing 5, and a sealing ring 16 is installed in the sealing groove. The sealing plate 15 seals and blocks the outlet end of the feed pipe 7 through the sealing ring 16.

[0037] The fluid in the inlet pipe 7 can cause the sealing plate 15 to rotate after impacting the sealing plate 15. When the sealing plate 15 rotates, the elastic piece 17 undergoes elastic deformation. After the sealing plate 15 rotates, the fluid can enter the housing 5. After the centrifugal pump body 2 stops rotating, under the elastic action of the elastic piece 17, the sealing plate 15 rotates back to its original position and seals the outlet end of the inlet pipe 7.

[0038] Before starting the centrifugal pump body 2 for the first time, the fluid can be filled into the housing 5 through the filling pipe 18 by opening the cap. After filling the housing 5 with the fluid, then cover the cap on the filling pipe 18. After starting the motor 3, the impeller of the centrifugal pump body 2 rotates. When the impeller rotates rapidly, the blades of the impeller cause the fluid to rotate quickly. The rotating fluid flies out of the impeller under the action of centrifugal force. After the fluid in the pump is thrown out, a vacuum area is formed in the central part of the impeller. The fluid enters the centrifugal pump body 2 in sequence through the inlet pipe 7, the housing 5 and the connecting pipe 8 under the action of atmospheric pressure, and then the fluid is continuously transported.

[0039] When the fluid impacts the sealing plate 15 in the inlet pipe 7, the sealing plate 15 rotates around the rotating rod 14, and the elastic piece 17 undergoes elastic deformation. When the centrifugal pump body 2 stops pumping, under the elastic action of the elastic piece 17, the sealing plate 15 quickly returns to its original position and seals the outlet end of the inlet pipe 7. After stopping the pump, it can prevent the fluid in the housing 5 from flowing back through the inlet pipe 7, ensure the amount of fluid in the housing 5 and the pump chamber of the centrifugal pump body 2, and thus ensure the self-priming function of the centrifugal pump body 2.

[0040] Opening the cover plate 9 can take out the sealing plate 15, which is convenient for replacing the sealing plate 15 and at the same time convenient for replacing the sealing ring 16. The sealing ring 16 is located in the sealing groove, which can prevent the fluid from scouring the sealing ring 16 for a long time and reducing its service life. It can improve the maintenance cycle and reduce the use cost.

[0041] Embodiment 2: On the basis of Embodiment 1, as shown in Figure 2 and Figure 6 One end of the elastic piece 17 is fixedly connected to the upper end of the sealing plate 15. The lower end of the elastic piece 17 bends upward to form a bent portion, and an arc-shaped groove 20 is formed at the lower end of the bent portion. The upper part of the inlet pipe 7 in the housing 5 is slidably clamped in the arc-shaped groove 20.

[0042] During the deformation process of the elastic piece 17, the bent portion at its lower end can always tightly abut against the upper part of the inlet pipe 7 in the housing 5, which can improve the stability of the elastic piece 17 during deformation.

[0043] Embodiment 3: On the basis of Embodiment 1, as shown in Figure 2 The two ear plates 13 are fixedly connected by a stop rod 21. The upper end of the sealing plate 15 is located between the elastic piece 17 and the stop rod 21, and the stop rod 21 can limit the rotation angle of the sealing plate 15.

[0044] By arranging the shift lever 21, the shift lever 21 can limit the rotation angle of the sealing plate 15. When the fluid in the inlet pipe 7 impacts the sealing plate 15, it can prevent the deformation amount of the elastic piece 17 from exceeding its maximum deformation amount due to excessive rotation angle of the sealing plate 15, and can effectively protect the elastic piece 17.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-priming centrifugal pump, comprising a bottom plate (1), a motor (3) and a centrifugal pump body (2) are fixed at the upper end of the bottom plate (1), and the motor (3) is used to drive the rotation of the rotating shaft of the centrifugal pump body (2), characterized in that, A housing (5) is fixed on a bottom plate (1). A communicating pipe (8) is fixedly connected and communicated at the lower end of the housing (5). The communicating pipe (8) is communicated with the inlet end of a centrifugal pump body (2). One side at the upper end of the housing (5) is fixedly connected and communicated with an inlet pipe (7). The outlet end of the inlet pipe (7) is located inside the housing (5). A slot hole (19) is formed at the upper end of the housing (5). A cover plate (9) for blocking the slot hole (19) is detachably and fixedly sealed and connected to the upper end of the housing (5). Two ear plates (13) are fixed at the lower end of the cover plate (9). A part of the inlet pipe (7) inside the housing (5) is located between the two ear plates (13). A sealing plate (15) is rotatably arranged between the two ear plates (13). The upper end of the sealing plate (15) is connected with the upper end of the part of the inlet pipe (7) inside the housing (5) through an elastic sheet (17). A sealing groove is formed at one end of the inlet pipe (7) inside the housing (5). A sealing ring (16) is installed in the sealing groove. The sealing plate (15) seals and blocks the outlet end of the inlet pipe (7) through the sealing ring (16). After the fluid in the inlet pipe (7) impacts the sealing plate (15), the sealing plate (15) can be rotated. When the sealing plate (15) rotates, the elastic sheet (17) undergoes elastic deformation. After the sealing plate (15) rotates, the fluid can enter the housing (5). After the centrifugal pump body (2) stops rotating, under the elastic action of the elastic sheet (17), the sealing plate (15) rotates back to its original position and seals and blocks the outlet end of the inlet pipe (7).

2. The self-priming centrifugal pump according to claim 1, characterized in that The sealing plate (15) is a metal plate. The sealing plate (15) is rotatably connected with the ear plates (13) through a rotating rod (14).

3. The self-priming centrifugal pump according to claim 1, wherein A coupling (4) is fixed on the bottom plate (1). The output shaft of a motor (3) is connected with the rotating shaft of the centrifugal pump body (2) through the coupling (4).

4. The self-priming centrifugal pump according to claim 1, wherein A support plate (6) is fixed at the lower end of the housing (5). The support plate (6) is fixedly connected with the bottom plate (1).

5. The self-priming centrifugal pump according to claim 1, wherein A plurality of vertical insertion rods (10) are fixed at the lower end of the cover plate (9). A jack (11) concentric with the insertion rods (10) is formed at the upper end of the housing (5). The insertion rods (10) are inserted into the jacks (11) to position the cover plate (9).

6. The self-priming centrifugal pump according to claim 1, wherein, A rubber pad is fixed at the lower end of the cover plate (9). The cover plate (9) is hermetically connected with the upper end of the housing (5) through the rubber pad. The cover plate (9) is connected with the upper end of the housing (5) through a plurality of bolts (12).

7. The self-priming centrifugal pump according to claim 1, wherein A filling pipe (18) is fixedly connected and communicated at the upper end of the housing (5). A cap is detachably and fixedly sealed and connected to the filling pipe (18).

8. The self-priming centrifugal pump according to claim 1, wherein One end of the elastic sheet (17) is fixedly connected with the upper end of the sealing plate (15). The lower end of the elastic sheet (17) bends upward to form a bending part. An arc-shaped groove (20) is formed at the lower end of the bending part. The upper end of the part of the inlet pipe (7) inside the housing (5) is slidably clamped in the arc-shaped groove (20).

9. The self-priming centrifugal pump according to claim 1, wherein The two ear plates (13) are fixedly connected through a stop rod (21). The upper end of the sealing plate (15) is located between the elastic sheet (17) and the stop rod (21). The stop rod (21) can limit the rotation angle of the sealing plate (15).

Images