A centrifugal pump siphon water taking pump protection device and method

Abstract

The application relates to the technical field of water pump protection devices, in particular to a centrifugal pump siphon water taking water pump protection device and method; the centrifugal pump siphon water taking water pump protection device comprises a box body; a detection mechanism and an elimination mechanism are arranged in the box body; the detection mechanism is used for detecting whether bubbles are contained in liquid flowing into the detection mechanism; the elimination mechanism eliminates the bubbles in the liquid when the detection mechanism detects that the bubbles are contained in the liquid; laser emitted by a laser emitter of the detection mechanism is irradiated on a laser receiver; when the bubbles in the liquid pass through the laser, the laser is refracted, so that the laser is no longer irradiated on the laser receiver, and the bubbles are detected; the flow speed of the liquid is slowed down by a blocking plate, the bubbles float upwards out of the liquid, meanwhile, the liquid on the lower side of a storage tank is transmitted to the centrifugal pump, so that the bubbles cannot enter the centrifugal pump, and the blades of the centrifugal pump are not damaged.

Description

Technical Field

[0001] This invention relates to the field of water pump protection device technology, and in particular to a water pump protection device and method for centrifugal pump siphon water intake. Background Technology

[0002] Centrifugal pumps are commonly used mechanical devices for transporting liquids. A centrifugal pump generally consists of two parts: a motor and a pump body. Centrifugal pumps can be divided into single-stage centrifugal pumps and multi-stage centrifugal pumps according to the number of rotating shafts in the pump body. A single-stage centrifugal pump has only one rotating shaft, and it can transport smaller pressures and flow rates, making it suitable for transporting low-viscosity liquids. A multi-stage centrifugal pump has multiple rotating shafts and blades to increase flow rates and pressures, making it suitable for transporting liquids with larger flow rates and higher viscosity.

[0003] Since centrifugal pumps do not have a suction head, they cannot pump water when the water source is low. Therefore, centrifugal pumps are often used in conjunction with siphon tanks. The centrifugal pump draws water from the siphon tank, creating negative pressure inside the siphon tank. The external atmospheric pressure then forces the water source at a lower location into the siphon tank.

[0004] When the siphon tank seal breaks and air enters, the centrifugal force generated by the rotation of the blades pulls the air into the axial direction, compressing the air into bubbles. After the bubbles come into contact with the blades, they burst and expand rapidly, impacting the blades, causing air etching and triggering air hammer noise. This damages the blades, reduces the service life of the centrifugal pump, and generates noise, thus creating limitations.

[0005] Therefore, we propose a centrifugal pump siphon water pump protection device and method. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention provides a centrifugal pump siphon water pump protection device and method, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a centrifugal pump siphon water pump protection device, comprising:

[0008] The box body; connecting pipes are provided at both ends of the box body; one end of the connecting pipe is connected to the siphon tank, and the other end is connected to the centrifugal pump;

[0009] The chamber is equipped with a detection mechanism and an exclusion mechanism; the detection mechanism and the exclusion mechanism are connected by a connecting pipe; the detection mechanism is used to detect whether the liquid introduced into the detection mechanism contains air bubbles; the exclusion mechanism excludes the air bubbles in the liquid when the detection mechanism detects that the liquid contains air bubbles.

[0010] Preferably, the detection mechanism includes a square tube, a mounting base, a laser emitter, and a laser receiver; the square tube is fixedly connected to the housing, one end of the square tube is fixedly connected and communicates with the connecting pipe, and the other end is fixedly connected and communicates with the communicating pipe; two sets of mounting bases are respectively fixedly connected to the inner walls of the upper and lower ends of the square tube, and the two sets of mounting bases are arranged in a straight line in the horizontal direction.

[0011] Preferably, the mounting bases are arranged sequentially at uniform intervals in the direction of liquid flow.

[0012] Preferably, the exclusion mechanism includes a storage tank, a baffle plate, and a solenoid valve; the storage tank is fixedly connected to the housing; one end of the storage tank is connected to the connecting pipe, and the other end is connected to the connecting pipe; the connecting pipe and the connecting pipe at both ends of the storage tank are fixedly connected and connected by a straight connecting pipe; the solenoid valve is fixedly connected and connected to the straight connecting pipe; a solenoid valve is also fixedly connected and connected to the connecting pipe on one side of the storage tank.

[0013] The storage box is rotatably connected to a rotating shaft; the baffle plates are staggered on both sides inside the storage box; the baffle plates are fixedly connected to the rotating shaft; a synchronous gear is fixedly connected to the rotating shaft; a synchronous rack is slidably connected to the upper end of the storage box; a synchronous electric push rod is fixedly connected to the upper end of the storage box; the output end of the synchronous electric push rod is fixedly connected to the synchronous rack.

[0014] The laser emitted by the laser emitter of the detection mechanism shines on the laser receiver. When a bubble in the liquid passes through the laser, the laser is refracted, so the laser no longer shines on the laser receiver, thus detecting the bubble. The invention then uses a baffle plate to slow down the flow rate of the liquid, causing the bubble to float upwards out of the liquid. At the same time, the liquid at the bottom of the storage tank is transferred to the centrifugal pump, so that the bubble will not enter the centrifugal pump and will not damage the pump blades.

[0015] Preferably, an extrusion plate is slidably connected inside the storage box; the extrusion plate has a through groove and a receiving groove; both the through groove and the receiving groove penetrate the extrusion plate; the through groove is slidably engaged with the barrier plate; a support frame is fixedly connected to the slot below the receiving groove; a clamping frame is provided above the support frame; the clamping frame is connected to the support frame by bolts, and a semi-permeable membrane is clamped between the support frame and the clamping frame; an extrusion electric push rod is fixedly connected to the storage box; the output end of the extrusion electric push rod is fixedly connected to the extrusion plate.

[0016] Preferably, a scraper is slidably connected within the support frame, and a balloon and a piston assembly are fixedly connected to the extrusion plate; the balloon and the piston assembly are in communication; and the piston rod portion of the piston assembly is fixedly connected to the scraper.

[0017] Preferably, the barrier plate is oriented toward the square tube in the initial state.

[0018] Preferably, a sealing ring is fixedly connected to the through groove opening on the extrusion plate; the sealing ring is made of a flexible material, such as rubber.

[0019] By squeezing the liquid downwards with the extrusion plate, the air bubbles in the liquid are compressed and moved upwards, thereby accelerating the upward movement of the air bubbles and increasing the rate at which the expulsion mechanism of this invention removes air bubbles from the liquid. After the air bubbles float to the surface of the liquid, they are discharged from the semi-permeable membrane. At the same time, the baffle plate of this invention is positioned towards the detection mechanism. When the baffle plate rotates, it pushes the liquid toward the centrifugal pump. As the centrifugal pump impeller changes from conveying high-speed flowing liquid to static liquid, it causes the centrifugal pump impeller to decelerate suddenly, causing an impact on the centrifugal pump and potentially damaging it. This improves the actual performance of this invention.

[0020] A method for protecting a centrifugal pump from siphon water intake, applicable to the aforementioned centrifugal pump siphon water intake protection device, comprises the following steps:

[0021] S1. Connect the connecting pipe to the siphon tank and the centrifugal pump. When the centrifugal pump starts, the liquid in the siphon tank enters the centrifugal pump through the square pipe and the storage tank.

[0022] S2. The laser emitted by the laser emitter shines on the laser receiver. When bubbles appear in the liquid, the laser is refracted, thereby detecting the bubbles and switching the direct connection tube to the storage tank.

[0023] S3. After the liquid enters the storage tank, the flow rate is slowed down by the baffle plate. At the same time, the extrusion plate squeezes the liquid downward, causing the air bubbles in the liquid to move upward and finally be discharged from the semi-permeable membrane. The liquid at the bottom of the storage tank flows into the centrifugal pump.

[0024] The beneficial effects of this invention are:

[0025] 1. In this invention, a laser emitted by a laser emitter in a detection mechanism is directed onto a laser receiver. When a bubble in the liquid passes through the laser, the laser is refracted, causing it to no longer strike the receiver, thus detecting the bubble. Furthermore, this invention uses a baffle plate to slow down the flow of the liquid, causing the bubble to float upwards and out of the liquid. Simultaneously, the liquid at the bottom of the storage tank is transferred to a centrifugal pump, preventing the bubble from entering the pump and damaging its blades.

[0026] 2. This invention uses a pressing plate to press the liquid downwards, causing air bubbles within the liquid to be compressed and move upwards. This accelerates the upward movement of the air bubbles, increasing the rate at which the removal mechanism removes air bubbles from the liquid. After the air bubbles rise to the liquid surface, they are discharged through the semi-permeable membrane. Simultaneously, the baffle plate of this invention is positioned towards the detection mechanism. When the baffle plate rotates, it directs the liquid toward the centrifugal pump. This causes the centrifugal pump impeller to suddenly decelerate due to the transition from conveying high-speed flowing liquid to stationary liquid, resulting in an impact on the centrifugal pump and preventing damage. This, in turn, improves the practical effectiveness of this invention. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a centrifugal pump siphon water pump protection device according to the present invention;

[0028] Figure 2 for Figure 1 A cross-sectional view of the square tube from the perspective of section AA in the middle;

[0029] Figure 3 This is a schematic diagram of the structure of the storage box, the extrusion plate, and the barrier plate in this invention;

[0030] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0031] Figure 5 This is a schematic diagram of the structure of the barrier plate and the storage box when the barrier plate faces the detection mechanism in this invention;

[0032] Figure 6 This is a cross-sectional view of the barrier plate, the extrusion plate, and the sealing ring when the barrier plate of the present invention is rotated to a vertical position;

[0033] Figure 7 This is a schematic diagram of the structure of the extrusion plate, balloon piston assembly, scraper and semi-permeable membrane of the present invention.

[0034] In the diagram: 1. Housing; 11. Connecting pipe; 21. Square pipe; 22. Mounting base; 23. Laser emitter; 24. Laser receiver; 31. Storage box; 32. Barrier plate; 33. Solenoid valve; 34. Connecting pipe; 35. Straight connecting pipe; 36. Rotating shaft; 37. Synchronous gear; 38. Synchronous rack; 39. Synchronous electric push rod; 4. Extrusion plate; 41. Through groove; 42. Receiving groove; 43. Support frame; 44. Clamping frame; 45. Semi-permeable membrane; 46. Extrusion electric push rod; 5. Scraper; 51. Balloon; 52. Piston assembly; 53. Sealing ring. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Refer to the appendix of the instruction manual. Figure 1 A centrifugal pump siphon water pump protection device, comprising:

[0037] Box 1; connecting pipes 11 are provided at both ends of box 1; one end of the connecting pipe 11 of box 1 is connected to the siphon tank, and the other end is connected to the centrifugal pump.

[0038] The housing 1 is equipped with a detection mechanism and a removal mechanism; the detection mechanism and the removal mechanism are connected by a connecting pipe 34; the detection mechanism is used to detect whether the liquid introduced into the detection mechanism contains air bubbles; the removal mechanism removes the air bubbles in the liquid when the detection mechanism detects that the liquid contains air bubbles.

[0039] Refer to the instruction manual appendix Figure 2 In this embodiment, the detection mechanism includes a square tube 21, a mounting base 22, a laser emitter 23, and a laser receiver 24. The square tube 21 is fixedly connected to the housing 1. One end of the square tube 21 is fixedly connected to and communicates with the connecting pipe 11, and the other end is fixedly connected to and communicates with the connecting pipe 34. Two sets of mounting bases 22 are respectively fixedly connected to the inner walls of the upper and lower ends of the square tube 21. Both sets of mounting bases 22 are arranged in a straight line in the horizontal direction.

[0040] In this embodiment, the mounting bases 22 are arranged sequentially at uniform intervals in the direction of liquid flow.

[0041] Refer to the instruction manual appendix Figure 3 , 4 In this embodiment, the exclusion mechanism includes a storage tank 31, a baffle plate 32, and a solenoid valve 33. The storage tank 31 is fixedly connected inside the housing 1. One end of the storage tank 31 is connected to the connecting pipe 34, and the other end is connected to the connecting pipe 11. The connecting pipes 34 and the connecting pipe 11 at both ends of the storage tank 31 are fixedly connected and connected by a straight connecting pipe 35. The solenoid valve 33 is fixedly connected and connected to the straight connecting pipe 35. The solenoid valve 33 is also fixedly connected and connected to the connecting pipe 11 on one side of the storage tank 31.

[0042] A rotating shaft 36 is rotatably connected inside the storage box 31; baffle plates 32 are staggered on both sides inside the storage box 31; the baffle plates 32 are fixedly connected to the rotating shaft 36; a synchronous gear 37 is fixedly connected to the rotating shaft 36; a synchronous rack 38 is slidably connected to the upper end of the storage box 31; a synchronous electric push rod 39 is fixedly connected to the upper end of the storage box 31; the output end of the synchronous electric push rod 39 is fixedly connected to the synchronous rack 38.

[0043] In the initial state, the solenoid valve 33 on the direct connection pipe 35 is open, and the solenoid valve 33 on the connecting pipe 34 is closed. When using this invention, the operator connects the connecting pipe 11 near the detection mechanism on the housing 1 to the siphon tank, and the connecting pipe 11 near the discharge mechanism to the centrifugal pump, thereby completing the installation of this invention. The centrifugal pump of this invention is turned on by a float switch. When the water level in the target pool is low, the float descends and pulls the switch, starting the centrifugal pump. The impeller of the centrifugal pump rotates to generate centrifugal force, drawing the liquid in the siphon tank into the centrifugal pump and discharging it into the target pool. When the water level in the pool rises and the float floats, the centrifugal pump stops rotating.

[0044] The liquid in the siphon tank first passes through the square tube 21. The laser emitted by the laser emitter 23 on the upper side of the square tube 21 passes through the liquid and illuminates the laser receiver 24 on the lower side of the square tube 21. Thus, the laser receiver 24 receives the laser emitted by the corresponding laser emitter 23. When the siphon tank seal is damaged, causing air to be present in the water flowing to the centrifugal pump, the air forms bubbles in the liquid and flows with the liquid. When the bubbles pass through the laser emitter 23 and the laser receiver 24, the laser passes through the liquid and the bubbles. When the laser passes through the bubbles, it is refracted, causing the laser to deviate from its original trajectory and thus not illuminate the corresponding laser receiver 24. Therefore, the detection mechanism detects the presence of bubbles in the liquid. After the laser receiver 24 no longer receives the laser, the controller controls the solenoid valve 33 of the direct connection pipe 35 to close, and the solenoid valve 3 of the connecting pipe 11 to close. 3. When the liquid originally flowing from the direct connection pipe 35 to the water pump flows from the connecting pipe 34 and the storage tank 31 to the centrifugal pump, the controller controls the output end of the synchronous electric push rod 39 to extend and push the corresponding synchronous rack 38, so that the synchronous rack 38 drives the corresponding synchronous gear 37 to rotate, thereby causing all the baffles 32 to rotate to a vertical state. Therefore, when the liquid containing air bubbles reaches the storage tank 31, it is blocked by the staggered baffles 32 and the flow rate is slowed down. This allows the air bubbles in the liquid to have enough time to float upward when flowing between the baffles 32. Since the connecting pipe 11 is fixed and connected to the bottom of the storage tank 31, the liquid flowing to the centrifugal pump does not contain air bubbles. After a period of time, the solenoid valve 33 of the direct connection pipe 35 opens and the solenoid valve 33 on the connecting pipe 34 closes, allowing the liquid to flow from the direct connection pipe 35 to the centrifugal pump again.

[0045] In this invention, the mounting bases 22 for installing the laser emitter 23 and the laser receiver 24 are evenly spaced in the direction of liquid flow. Therefore, the laser emitter 23 and the laser receiver 24 are not arranged side by side. Thus, when a bubble passes between the two laser beams, the laser beams passing through both sides of the bubble will not be refracted by the bubble and then intersect, irradiating the corresponding laser receiver 24 and failing to detect the passage of the bubble. This improves the accuracy of the detection mechanism of this invention in detecting bubbles.

[0046] In this invention, the laser emitted by the laser emitter 23 of the detection mechanism is directed onto the laser receiver 24. When a bubble in the liquid passes through the laser, the laser is refracted, and the laser no longer shines on the laser receiver 24, thus detecting the bubble. In this invention, the flow rate of the liquid is slowed down by the baffle plate 32, causing the bubble to float upward out of the liquid. At the same time, the liquid at the bottom of the storage tank 31 is transferred to the centrifugal pump, so that the bubble will not enter the centrifugal pump and will not damage the blades of the centrifugal pump.

[0047] Example 2: Based on Example 1, refer to the appendix of the instruction manual. Figure 3 In this embodiment, a pressing plate 4 is slidably connected inside the storage box 31; a through groove 41 and a receiving groove 42 are provided on the pressing plate 4; both the through groove 41 and the receiving groove 42 penetrate the pressing plate 4; the through groove 41 and the barrier plate 32 are slidably engaged; a support frame 43 is fixedly connected to the slot below the receiving groove 42; a clamping frame 44 is provided above the support frame 43; the clamping frame 44 and the support frame 43 are connected by bolts, and a semi-permeable membrane 45 is clamped between the support frame 43 and the clamping frame 44; a pressing electric push rod 46 is fixedly connected to the storage box 31; the output end of the pressing electric push rod 46 is fixedly connected to the pressing plate 4.

[0048] Refer to the instruction manual appendix Figure 7 In this embodiment, a scraper 5 is slidably connected inside the support frame 43, and a balloon 51 and a piston assembly 52 are fixedly connected to the extrusion plate 4; the balloon 51 and the piston assembly 52 are connected; the piston rod part of the piston assembly 52 is fixedly connected to the scraper 5.

[0049] Refer to the instruction manual appendix Figure 5 In this embodiment, the barrier plate 32 is initially positioned facing the square tube 21.

[0050] Referring to the accompanying drawings, in this embodiment, a sealing ring 53 is fixedly connected to the opening of the through groove 41 on the extrusion plate 4; the sealing ring 53 is made of a flexible material, such as rubber.

[0051] As the liquid flows within the storage tank 31, the baffle plates 32 are staggered, corresponding to the through plates on the extrusion plate 4. The controller then controls the output end of the extrusion electric push rod 46 to extend and extrude the extrusion plate 4, causing the extrusion plate 4 to press the liquid downwards. Since the density of bubbles is lower than that of liquid, the liquid is compressed, which compresses the bubbles and accelerates their ascent. When the bubbles float to the surface of the liquid, they pass through the semi-permeable membrane 45 as the extrusion plate 4 presses downwards, thus expelling the bubbles from the liquid. This improves the bubble expulsion effect and ensures that the bubbles are completely expelled from the liquid, preventing them from re-entering the liquid.

[0052] In this invention, when the extrusion plate 4 presses the liquid downwards, the balloon 51 is also compressed by the liquid. The air inside the balloon 51 pushes the piston assembly 52, which in turn pushes the scraper 5. The scraper 5 then scrapes the side of the semi-permeable membrane 45 that is in contact with the liquid, cleaning up dirt or moss that has accumulated on the side of the semi-permeable membrane 45 that has been in contact with the liquid for a long time. This prevents the side of the semi-permeable membrane 45 that is in contact with the liquid from being covered and unable to allow air bubbles to pass through, thus preventing air bubble accumulation. After the extrusion plate 4 stops pressing the liquid, the balloon 51 returns to its original shape, causing the piston assembly 52 to pull the scraper 5 backwards, so that the scraper 5 returns to its original position.

[0053] In this invention, the baffle plate 32 faces the connecting pipe 34 in the initial state. Therefore, when the baffle plate 32 rotates to be vertical and staggered in the storage tank 31, the baffle plate 32 moves the liquid in the storage tank 31, causing the liquid in the storage tank 31 to flow towards the centrifugal pump. Thus, when the direct connecting pipe 35 is switched to the storage tank 31, the liquid in the storage tank 31 flows instead of remaining still. This prevents the centrifugal pump impeller from suddenly decelerating due to the change from high-speed liquid transmission to transmission of still liquid in the storage tank 31, which could impact the centrifugal pump and damage it. This improves the actual performance of the invention.

[0054] In this invention, during the downward movement of the extrusion ring, the baffle plate 32 is inserted into the sealing ring 53, thereby making the extrusion plate 4 and the baffle plate 32 in a relatively sealed state. The liquid will not seep into the through groove 41 due to the extrusion of the extrusion plate 4, thus affecting the effectiveness of the invention.

[0055] This invention uses a pressing plate 4 to press the liquid downwards, causing air bubbles within the liquid to be compressed and move upwards. This accelerates the upward movement of the air bubbles, increasing the rate at which the removal mechanism removes air bubbles from the liquid. After the air bubbles rise to the liquid surface, they are discharged through the semi-permeable membrane 45. Simultaneously, the barrier plate 32 is positioned towards the detection mechanism. When the barrier plate 32 rotates, it directs the liquid toward the centrifugal pump. This causes the centrifugal pump impeller to suddenly decelerate due to the transition from conveying high-speed flowing liquid to stationary liquid, resulting in an impact on the centrifugal pump and preventing damage. This, in turn, improves the practical effectiveness of this invention.

[0056] Example 3: A method for protecting a centrifugal pump from siphon water intake. This method is applicable to the aforementioned centrifugal pump from siphon water intake protection device. The steps of this method are as follows:

[0057] S1. Connect the connecting pipe 11 to the siphon tank and the centrifugal pump. When the centrifugal pump starts, the liquid in the siphon tank enters the centrifugal pump through the square pipe 21 and the storage tank 31.

[0058] S2. The laser emitted by the laser emitter 23 shines on the laser receiver 24. When bubbles appear in the liquid, the laser is refracted, thereby detecting the bubbles and switching the direct connection tube 35 to the storage tank 31.

[0059] S3. After the liquid enters the storage tank 31, the flow rate is slowed down by the baffle plate 32. At the same time, the squeezing plate 4 squeezes the liquid downward, and the air bubbles in the liquid move upward. Finally, they are discharged from the semi-permeable membrane 45, and the liquid at the bottom of the storage tank 31 flows into the centrifugal pump.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump siphon water pump protection device, comprising: Box (1); connecting pipes (11) are provided at both ends of the box (1); the connecting pipe (11) at one end of the box (1) is connected to the siphon bucket, and the other end is connected to the centrifugal pump; The features are as follows: a detection mechanism and an exclusion mechanism are provided inside the housing (1); the detection mechanism and the exclusion mechanism are connected by a connecting pipe (34); the detection mechanism is used to detect whether the liquid introduced into the detection mechanism contains air bubbles; the exclusion mechanism excludes the air bubbles in the liquid when the detection mechanism detects that the liquid contains air bubbles; the detection mechanism includes a square tube (21), a mounting base (22), a laser emitter (23), and a laser receiver (24); the square tube (21) is fixedly connected inside the housing (1), one end of the square tube (21) is fixedly connected and connected to the connecting pipe (11), and the other end is fixedly connected and connected to the connecting pipe (34); two sets of mounting bases (22) are respectively fixedly connected to the housing (1). On the inner walls of the upper and lower ends of the square tube (21), two sets of mounting seats (22) are arranged in a straight line in the horizontal direction; the discharge mechanism includes a storage box (31), a baffle plate (32) and a solenoid valve (33); the storage box (31) is fixedly connected to the box body (1); one end of the storage box (31) is connected to the connecting pipe (34), and the other end is connected to the connecting pipe (11); the connecting pipe (34) and the connecting pipe (11) at both ends of the storage box (31) are fixedly connected and connected by a straight connecting pipe (35); the solenoid valve (33) is fixedly connected and connected to the straight connecting pipe (35); the solenoid valve (33) is also fixedly connected and connected to the connecting pipe (11) on one side of the storage box (31). A rotating shaft (36) is rotatably connected inside the storage box (31); the baffle plate (32) is staggered on both sides inside the storage box (31); the baffle plate (32) is fixedly connected to the rotating shaft (36); a synchronous gear (37) is fixedly connected to the rotating shaft (36); a synchronous rack (38) is slidably connected to the upper end of the storage box (31); a synchronous electric push rod (39) is fixedly connected to the upper end of the storage box (31); the output end of the synchronous electric push rod (39) is fixedly connected to the synchronous rack (38); a pressing plate (4) is slidably connected inside the storage box (31); a through groove (41) and a receiving groove (42) are provided on the pressing plate (4). The through groove (41) and the receiving groove (42) both penetrate the extrusion plate (4); the through groove (41) and the barrier plate (32) are slidably fitted; a support frame (43) is fixedly connected to the groove below the receiving groove (42); a clamping frame (44) is provided above the support frame (43); the clamping frame (44) and the support frame (43) are connected by bolts, and a semi-permeable membrane (45) is clamped between the support frame (43) and the clamping frame (44); an extrusion electric push rod (46) is fixedly connected to the storage box (31); the output end of the extrusion electric push rod (46) is fixedly connected to the extrusion plate (4).

2. The centrifugal pump siphon water pump protection device according to claim 1, characterized in that: The mounting bases (22) are arranged sequentially at uniform intervals in the direction of liquid flow.

3. A centrifugal pump siphon water pump protection device according to claim 2, characterized in that: A scraper (5) is slidably connected inside the support frame (43), and a balloon (51) and a piston assembly (52) are fixedly connected to the extrusion plate (4); the balloon (51) and the piston assembly (52) are connected; the piston rod part of the piston assembly (52) is fixedly connected to the scraper (5).

4. A centrifugal pump siphon water pump protection device according to claim 3, characterized in that: The barrier plate (32) is initially positioned facing the square tube (21).

5. A centrifugal pump siphon water pump protection device according to claim 4, characterized in that: A sealing ring (53) is fixedly connected to the opening of the through groove (41) on the extrusion plate (4); the sealing ring (53) is made of flexible material.

6. A method for protecting a centrifugal pump by siphoning water intake, the method being applicable to the centrifugal pump by siphoning water intake protection device as described in any one of claims 1-5, characterized in that: The steps of this method are as follows: S1. Connect the connecting pipe (11) to the siphon tank and the centrifugal pump. When the centrifugal pump is started, the liquid in the siphon tank enters the centrifugal pump through the square pipe (21) and the storage tank (31). S2. The laser emitted by the laser emitter (23) shines on the laser receiver (24). When bubbles appear in the liquid, the laser is refracted, thereby detecting the bubbles and switching the direct connection tube (35) to the storage tank (31). S3. After the liquid enters the storage tank (31), the flow rate is slowed down by the baffle plate (32), and at the same time the squeezing plate (4) squeezes the liquid downward, so that the bubbles in the liquid move upward and are finally discharged from the semi-permeable membrane (45). The liquid at the bottom of the storage tank (31) flows into the centrifugal pump.

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