Flow stabilizer for centrifugal pump

Abstract

The flow stabilizing device for the centrifugal pump comprises a volute, a centrifugal impeller is movably arranged in the middle of the inner side of the volute through a rotating shaft, a liquid inlet is formed in the middle of the surface of the volute, a liquid outlet is fixedly formed in one side of the surface of the volute, and a check valve is fixedly arranged at one end of the liquid outlet. A check plate is movably arranged in the middle of the inner side of the check valve through a rotating shaft, a transmission mechanism actively driving the check plate to rotate and open is arranged on one side in the check valve, the transmission mechanism comprises a sleeve, a movable plug, a strong magnet and a screw rod, and the sleeve is fixedly arranged on one side of the surface of the check valve; and a movable plug is movably clamped at the lower end in the sleeve. The check plate can be in the maximum opening state when the pump body is just started while liquid backflow can be prevented, the situation that the check plate generates certain resistance to fluid, and consequently flow and pressure fluctuate is avoided, and therefore the flow stabilizing effect can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steady flow device technical field, specifically is a centrifugal pump with steady flow device. BACKGROUND

[0002] The centrifugal pump is one of the most common devices in the prior art, and the centrifugal pump in the prior art may have a liquid backflow phenomenon when in use. For example, if the liquid in the pipeline still has pressure when the centrifugal pump is closed, the liquid may flow back to the pump in the opposite direction, thereby causing the backflow phenomenon. In addition, improper selection of the centrifugal pump or unreasonable matching of the system may cause the flow of the pump to be too large or too small, which may also cause the water backflow phenomenon to occur. When the fluid backflows, the pump body may be reversed, which may cause the rotating machine seal, shaft sleeve lock nut and impeller locking nut to be loosened and the damage of the pump to be aggravated. The entire system may also have pressure fluctuations, flow changes and inaccurate measurement, and if the liquid in the pipeline is flammable and explosive, the backflow may increase the risk of fire or explosion.

[0003] At this time, a steady flow device is needed to prevent the backflow of the liquid, and in the prior art, a check valve is generally installed at the liquid outlet of the pump body to prevent the backflow of the liquid. However, the check valve needs a certain time to be completely opened to allow the fluid to pass through when the pump body is just started. During this process, the check valve may generate a certain resistance to the fluid, causing fluctuations in the flow and pressure, and a vacuum may be formed inside the pump body to continuously pump the liquid. Therefore, a centrifugal pump with a steady flow device needs to be improved to solve the above problems. SUMMARY

[0004] The utility model discloses a centrifugal pump with a steady flow device to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a centrifugal pump with a steady flow device, comprising a volute, a centrifugal impeller movably arranged in the middle of the inner side of the volute through a rotating shaft, a liquid inlet arranged on the surface of the volute, a liquid outlet fixedly arranged on one side of the surface of the volute, a check valve fixedly arranged at one end of the liquid outlet, a check plate movably arranged in the middle of the inner side of the check valve through a rotating shaft, a transmission mechanism arranged on one side of the inner part of the check valve to drive the check plate to rotate and open, the transmission mechanism comprising a sleeve, a movable plug, a strong magnet and a screw rod, the sleeve being fixedly arranged on one side of the surface of the check valve, the movable plug being movably clamped in the inner lower end of the sleeve, the strong magnet being fixedly arranged at the lower end of the movable plug, and the screw rod being movably screwed in the inner upper end of the sleeve.

[0006] Preferably, the lower end of the screw is movably connected between a bearing and the movable plug, the screw can rotate and drive the movable plug to move up and down under the action of the screw thread, at this time the screw can only rotate relative to the movable plug, but cannot move relative to the movable plug.

[0007] Preferably, the volute surface is provided with a connecting shaft on one side, the outer surface of the connecting shaft is fixedly provided with a spline, and the connecting shaft is fixedly connected with the rotating shaft of the centrifugal impeller.

[0008] Preferably, the upper end of the screw is fixedly provided with a twisting block, and the screw can be conveniently rotated through the twisting block.

[0009] Preferably, the outer surface of the check plate is fixedly provided with an iron block at the lower end, and the check plate can be attracted by the strong magnet through the iron block, so that the check plate can be driven to rotate and open when the strong magnet moves up.

[0010] Preferably, the rotating shaft of the check plate is provided with a torsion spring, and the check plate can be automatically driven to rotate and reset by the torsion spring (not shown in the figure), that is, the check plate is rotated and reset towards the direction close to the liquid outlet, so that the liquid outlet can be quickly blocked by the pressure of the backflow liquid and the elastic force of the torsion spring to prevent the backflow of the liquid.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] When the pump just starts to pump water, the water pressure has not been completely established and the volute inside has not formed enough negative pressure, at this time the check plate can be manually opened, the check plate can be in the maximum opening state when the pump body just starts, to prevent the check plate from generating certain resistance to the fluid, to cause the flow and pressure fluctuation to occur, so that the flow stabilizing effect can be achieved.

[0013] When the water flow establishes normal water pressure, in order to prevent the strong magnet from attracting the check plate to cause the check plate to fail to reset normally, the screw can be rotated to make the movable plug continue to move up, the strong magnet moves to the uppermost end that can move, the strong magnet is far enough from the check plate, so that the interference of the strong magnet can be reduced, to ensure that the whole device can normally operate, so that the device can drive the check plate to overturn through magnetic force, so that the connection can be conveniently disconnected, and the normal work of the check plate can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the flow stabilizing device for the centrifugal pump.

[0015] Figure 2A side view of the flow stabilizing device for the centrifugal pump of the utility model;

[0016] Figure 3 A sectional view of the flow stabilizing device for the centrifugal pump of the utility model;

[0017] Figure 4 A front view of the flow stabilizing device for the centrifugal pump of the utility model, Figure 3

[0018] Figure 5 A lower moving view of the movable plug in the flow stabilizing device for the centrifugal pump of the utility model;

[0019] Figure 6 A turnover view of the check valve in the flow stabilizing device for the centrifugal pump of the utility model.

[0020] In the drawing: 1, volute; 2, centrifugal impeller; 3, liquid inlet; 4, liquid outlet; 5, check valve; 6, check valve plate; 7, sleeve; 8, movable plug; 9, strong magnet; 10, screw rod; 11, connecting shaft; 12, screwing block; 13, spline; 14, iron block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Please refer to Figures 1-6 The utility model provides a technical scheme: a flow stabilizing device for centrifugal pump, including volute 1, volute 1 inboard middle part is provided with centrifugal impeller 2 through the shaft activity, volute 1 surface middle part is provided with liquid inlet 3, volute 1 surface one side is fixed with liquid outlet 4, liquid outlet 4 one end is fixed with check valve 5, check valve 5 inboard middle part is provided with check valve plate 6 through the shaft activity, check valve 5 inside one side is provided with the transmission mechanism of driving check valve plate 6 to rotate and open, the transmission mechanism includes sleeve 7, movable plug 8, strong magnet 9, screw rod 10, check valve 5 surface one side is fixed with sleeve 7, sleeve 7 inside lower end is movably clamped with movable plug 8, movable plug 8 lower end is fixed with strong magnet 9, sleeve 7 inside upper end is movably screwed with screw rod 10.

[0023] ​The lower end of the screw rod 10 is movably connected between a bearing and the movable plug 8, and the screw rod 10 can rotate and drive the movable plug 8 to move up and down under the action of the screw thread, at this time, the screw rod 10 can only rotate relative to the movable plug 8, but cannot move relative to the movable plug 8;

[0024] The volute 1 is provided with a connecting shaft 11 on one side of the surface, the outer surface of the connecting shaft 11 is fixedly provided with a spline 13, the connecting shaft 11 is fixedly connected with the rotating shaft on which the centrifugal impeller 2 is located, and an electric motor can be connected to the connecting shaft 11 and the spline 13, so that the impeller can be driven to rotate at high speed;

[0025] The upper end of the screw rod 10 is fixedly provided with a twisting block 12, and the screw rod 10 can be conveniently rotated through the twisting block 12;

[0026] The outer surface of the lower end of the check plate 6 is fixedly provided with an iron block 14, and the check plate 6 can be attracted by the strong magnet 9 through the iron block 14, so that the check plate 6 can be driven to rotate and open along with the upward movement of the strong magnet 9;

[0027] The rotating shaft on which the check plate 6 is located is provided with a torsion spring, and the check plate 6 can be automatically driven to rotate and reset through the torsion spring (not shown in the figure), that is, the check plate 6 is rotated and reset towards the direction close to the liquid outlet 4, so that if the liquid backflows, the pressure of the backflowing liquid and the elastic force of the torsion spring can quickly block the liquid outlet 4 to prevent the liquid from backflowing.

[0028] Working principle: when the device is used, an electric motor can be connected to the connecting shaft 11 and the spline 13, so that the impeller can be driven to rotate at high speed, so that the function of pumping water can be achieved, and at the beginning of pumping water, since the water pressure has not been completely established and the volute 1 inside has not formed enough negative pressure, the check plate 6 can be manually opened at this time, so that the check plate 6 can be in the maximum opening state when the pump body is just started, to prevent the check plate 6 from generating certain resistance to the fluid, causing the flow and pressure to fluctuate, so that the function of stabilizing the flow can be achieved;

[0029] Specific operation can be as shown in Figure 4 、 Figure 5 、 Figure 6 At the beginning, when there is no water pumping and no water pressure, the check plate 6 is in the closed state as shown in Figure 4 , then the screw rod 10 is rotated through the screw thread, so that the screw rod 10 drives the movable plug 8 and the strong magnet 9 to move downward, when the strong magnet 9 approaches the lower half of the check plate 6, the iron block 14 is attracted by the magnetic force, so that the check plate 6 rotates and opens a part around the rotating shaft, then the screw rod 10 is reversed, so that the screw rod 10 moves upward, so that the check plate 6 can be driven to move upward and completely open through the magnetic force, so that the water flow can pass through the pump body when it is just working;

[0030] When the water flow establishes normal water pressure, in order to prevent the strong magnet 9 from adsorbing the check plate 6 and causing the check plate 6 to fail to reset normally, the screw rod 10 can be rotated to make the movable plug 8 continue to move upward, so that the strong magnet 9 moves to the uppermost end that can move, so that the strong magnet 9 is far enough from the check plate 6, so as to reduce the interference of the strong magnet 9, so that if the liquid backflow cooperates with the pressure of the backflow liquid and the self-elastic force of the torsional spring, the liquid outlet 4 can be quickly blocked to prevent the liquid backflow, so that the device can still guarantee the normal backflow and steady flow effect.

[0031] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A flow stabilizing device for a centrifugal pump comprising a volute (1), characterized in that: The volute (1) is movably provided with a centrifugal impeller (2) in the middle of the inner side, the surface of the volute (1) is provided with a liquid inlet (3) in the middle, the surface of the volute (1) is fixedly provided with a liquid outlet (4) on one side, the liquid outlet (4) is fixedly provided with a check valve (5) on one end, the check valve (5) is movably provided with a check plate (6) in the middle of the inner side, the check valve (5) is provided with a transmission mechanism on one side of the inner side, the transmission mechanism drives the check plate (6) to rotate and open, the transmission mechanism comprises a sleeve (7), a movable plug (8), a strong magnet (9) and a screw rod (10), the check valve (5) is fixedly provided with the sleeve (7) on one side of the surface, the movable plug (8) is movably clamped in the sleeve (7), the strong magnet (9) is fixedly arranged on the lower end of the movable plug (8), and the screw rod (10) is movably screwed in the sleeve (7).

2. A flow stabilizing device for a centrifugal pump according to claim 1, characterized in that: The lower end of the screw rod (10) is movably connected between the bearing and the movable plug (8).

3. A flow stabilizing device for a centrifugal pump according to claim 1, characterized in that: The surface of the volute (1) is provided with a connecting shaft (11) on one side, the outer surface of the connecting shaft (11) is fixedly provided with a spline (13), and the connecting shaft (11) is fixedly connected with the rotating shaft of the centrifugal impeller (2).

4. The flow stabilizing device for a centrifugal pump according to claim 1, characterized in that: The upper end of the screw rod (10) is fixedly provided with a twisting block (12).

5. A flow stabilizing device for a centrifugal pump according to claim 1, characterized in that: The lower end of the outer surface of the check plate (6) is fixedly provided with an iron block (14).

6. A flow stabilizing device for a centrifugal pump according to claim 1, characterized in that: The rotating shaft of the check plate (6) is provided with a torsion spring.

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