High-efficiency self-suction centrifugal pump

Abstract

The application relates to the technical field of centrifugal pumps, in particular to a high-efficiency self-suction centrifugal pump which comprises a pump body, a driving pump shaft, a liquid storage chamber and a volute chamber arranged in the pump body, and a backflow valve mechanism arranged on a backflow channel between the liquid storage chamber and the volute chamber, and comprises a positioning transmission assembly for supporting and transmitting power, a rotating flow pipe rotatably installed on the positioning transmission assembly and in transmission connection with the driving pump shaft, and a centrifugal opening and closing assembly arranged in the rotating flow pipe and used for controlling the opening and closing of the backflow channel through centrifugal force. The centrifugal opening and closing assembly is used for replacing a traditional spring backflow valve structure, the centrifugal force generated by the rotation of the centrifugal opening and closing assembly driven by the driving pump shaft directly drives a closing flashboard to slide along an internal inclined surface of the rotating flow pipe, the rotating flow pipe internal backflow hole is fully opened, the effective flow area of the backflow hole in the self-suction stage is greatly increased, the plugging phenomenon is avoided, and the self-suction efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, specifically to a high-efficiency self-priming centrifugal pump. Background Technology

[0002] Self-priming centrifugal pumps are widely used in agricultural irrigation, industrial circulation, and wastewater treatment due to their ability to start without priming. Their core advantage lies in the self-priming stage, where a reflux structure (including a reflux orifice or reflux valve) mixes and discharges the gas and liquid mixture within the pump, achieving gas-liquid separation and establishing a vacuum to complete self-priming. Existing reflux structures are mainly divided into two categories: fixed reflux orifices and reflux valves with moving parts. While both types of structures can assist in self-priming, long-standing unresolved issues in practical applications have hindered the pump's efficient and stable operation.

[0003] Specifically, the fixed reflux hole has a simple structure and no moving parts, avoiding the risk of jamming. However, its fatal flaw is that it cannot be closed during normal operation. After self-priming, the reflux hole continues to connect the high-pressure zone (separation chamber) and the low-pressure zone (impeller inlet) inside the pump, causing the high-pressure liquid to flow back to the impeller inlet without effective work, which significantly reduces the pump's operating efficiency.

[0004] While return valves with moving parts (such as valve discs, valve balls, and springs) can close after self-priming using spring force, theoretically without affecting normal operating efficiency, they introduce new problems: First, the moving parts themselves can obstruct the effective cross-sectional area of ​​the return orifice, limiting the return flow during the self-priming phase, prolonging the self-priming time, or even causing self-priming failure. Second, the sealing surfaces of the moving parts and valve seats are easily clogged by particulate impurities in the conveyed medium or have dirt adhering to them, causing continuous internal leakage of high-pressure liquid when the seal is not tight, or causing the self-priming function to fail due to complete jamming and inability to open. To address these technical problems, we propose a high-efficiency self-priming centrifugal pump. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency self-priming centrifugal pump to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency self-priming centrifugal pump, comprising a pump body and a drive pump shaft, wherein the pump body is provided with a liquid storage chamber and a volute chamber, and further comprising a reflux valve mechanism disposed on the reflux channel between the liquid storage chamber and the volute chamber, comprising:

[0007] Positioning transmission components are used to support and transmit power;

[0008] The rotating flow tube is rotatably mounted on the positioning transmission assembly and is connected to the drive pump shaft via a transmission connection.

[0009] The centrifugal opening and closing assembly is located inside the rotating flow tube and is used to control the opening and closing of the reflux channel by centrifugal force.

[0010] The pressure regulating component, located on the rotating flow pipe, is used to adjust the power transmission state of the positioning transmission component according to the pressure inside the pump.

[0011] When the pump body is in the self-priming stage, the pump shaft drives the rotating flow pipe to rotate through the positioning transmission component, and the centrifugal opening and closing component opens the return channel under the action of centrifugal force. When the pump body is in the normal conveying stage, the pressure inside the pump body increases, the pressure regulating component disconnects the power transmission of the positioning transmission component under pressure, and the centrifugal opening and closing component returns to the initial state to close the return channel.

[0012] Preferably, the pump body is further provided with an intake chamber and a gas-liquid separation chamber. The volute chamber is connected to both the intake chamber and the gas-liquid separation chamber. The liquid storage chamber is located below the intake chamber and is connected to the gas-liquid separation chamber.

[0013] Preferably, the positioning transmission assembly includes a transmission bevel gear disk, which is engaged with the outside of the rotating flow tube for transmitting power; the transmission bevel gear disk is driven to move axially along the rotating flow tube.

[0014] Preferably, the interior of the rotating flow tube has inclined surfaces that slope towards both ends, and the interior of the rotating flow tube forms a return hole through the two inclined surfaces.

[0015] Preferably, the centrifugal opening and closing assembly includes a closing insert plate, which is slidably installed on the inclined surface of the rotating flow tube near the volute chamber. Several closing insert plates are brought together to form a complete cone shape, and the tilt angle of the cone shape is adapted to the inclined surface.

[0016] Preferably, after several of the closed inserts are brought together, they can block the reflux hole inside the rotating flow pipe, and the inner wall of the closed insert is provided with an inclined surface near the tip.

[0017] Preferably, the centrifugal opening and closing assembly includes a centrifugal drive block and a speed-changing drive unit. The centrifugal drive block is connected to the closing insert plate through the speed-changing drive unit. When the rotating flow tube rotates, the centrifugal drive block is driven by centrifugal force to move the closing insert plate closer to the volute chamber.

[0018] Preferably, the speed-changing drive unit includes a transmission gear that is connected to the closing insert plate; a speed-changing gear that is fixedly connected to the transmission gear; and a transmission rack that is fixedly connected to the centrifugal drive block and meshes with the speed-changing gear.

[0019] Preferably, the pressure regulating component and the centrifugal opening and closing component are positioned one-to-one. The pressure regulating component includes a main regulating part, which is connected to the transmission bevel gear disk and is used to adjust the axial position of the transmission bevel gear disk according to the pressure inside the pump.

[0020] Preferably, the pressure-adjusting assembly further includes a pressure-triggered release section disposed on the main adjustment section, which is used to enable the main adjustment section to achieve instantaneous release.

[0021] In the above technical solution, the beneficial effects of the present invention are as follows: by replacing the traditional spring return valve structure with a centrifugal opening and closing component, the centrifugal force generated by the drive pump shaft driving the centrifugal opening and closing component to rotate directly drives the closing plate to slide along the inclined surface inside the rotating flow pipe, thereby achieving full opening of the return hole inside the rotating flow pipe, which greatly increases the effective flow area of ​​the return hole during the self-priming stage, avoids clogging, and improves the self-priming efficiency; in addition, the closing plate is inclined, and when it rotates, impurities on its sealing surface will also be affected by centrifugal force, thereby greatly reducing the probability of impurities adhering to the sealing surface of the closing plate, thus ensuring its sealing performance after closing and avoiding power loss.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0023] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention after assembly;

[0026] Figure 2 This is a schematic diagram of the structure of the present invention from a side cross-section;

[0027] Figure 3 This is a structural schematic diagram highlighting the location of the reflux valve mechanism in this invention;

[0028] Figure 4 This is a schematic diagram of the overall structure of the reflux valve mechanism of the present invention;

[0029] Figure 5 This is a schematic diagram of the centrifugal opening and closing component of the present invention in the closed state;

[0030] Figure 6 This is a schematic diagram of the centrifugal opening and closing component of the present invention in its open state;

[0031] Figure 7 This is a schematic diagram of the connection between the transmission bevel gear disk and the rotating flow tube of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure after the closed insert plates of the present invention are brought together;

[0033] Figure 9 This is a schematic diagram of the cross-sectional structure of the closed insert assembly of the present invention;

[0034] Figure 10 This is a schematic diagram of the cross-section of the transmission gear of the present invention;

[0035] Figure 11 This is a schematic diagram of the structure of the pressure-adjusting component of the present invention before it is activated;

[0036] Figure 12 This is a schematic diagram of the structure of the pressure regulating component of the present invention after it is activated.

[0037] Explanation of reference numerals in the attached figures:

[0038] In the diagram: 1. Pump body; 2. Bearing housing; 3. Drive pump shaft; 4. Impeller; 5. Suction chamber; 6. Gas-liquid separation chamber; 7. Liquid storage chamber; 8. Volute chamber; 9. Return valve mechanism; 91. Positioning transmission assembly; 911. Positioning tube; 912. Mounting base; 913. Transmission bevel gear disc; 92. Rotary flow pipe; 93. Centrifugal opening and closing assembly; 931. Transmission gear; 932. Transmission rack; 933. Centrifugal drive block; 934. Closing insert plate; 935. Opening and closing rack; 936. Speed ​​change gear; 937. Return coil spring; 94. Pressure adjustment assembly; 941. First-stage cylinder; 942. First-stage piston; 943. Transmission arm; 944. Second-stage cylinder; 945. Second-stage piston; 946. Elastic pin. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0040] Please see Figure 1-12This invention provides a technical solution: a high-efficiency self-priming centrifugal pump, comprising a pump body 1, a drive pump shaft 3, a liquid storage chamber 7 and a volute chamber 8 disposed in the pump body 1, and a reflux valve mechanism 9 disposed on the reflux channel between the liquid storage chamber 7 and the volute chamber 8, comprising:

[0041] Positioning transmission assembly 91, used to support and transmit power;

[0042] The rotating flow pipe 92 is rotatably mounted on the positioning transmission assembly 91 and is connected to the drive pump shaft 3 via transmission.

[0043] Centrifugal opening and closing assembly 93 is located inside the rotating flow tube 92 and is used to control the opening and closing of the reflux channel by centrifugal force;

[0044] The pressure regulating component 94 is located on the rotating flow pipe 92 and is used to adjust the power transmission state of the positioning transmission component 91 according to the pressure inside the pump.

[0045] When the pump body 1 is in the self-priming stage, the drive pump shaft 3 drives the rotating flow pipe 92 to rotate through the positioning transmission component 91, and the centrifugal opening and closing component 93 opens the return channel under the action of centrifugal force. When the pump body 1 is in the normal conveying stage, the pressure inside the pump body 1 increases, the pressure regulating component 94 disconnects the power transmission of the positioning transmission component 91 under pressure, and the centrifugal opening and closing component 93 returns to the initial state and closes the return channel.

[0046] Specifically, when the self-priming centrifugal pump is in the self-priming stage, the drive pump shaft 3 drives the rotating flow pipe 92 and the centrifugal opening and closing assembly 93 to rotate synchronously through the positioning transmission assembly 91. The centrifugal opening and closing assembly 93 is activated by centrifugal force, fully opening the return hole inside the positioning transmission assembly 91, which greatly increases the effective flow area of ​​the return hole during the self-priming stage. The closing insert plate 934 in the centrifugal opening and closing assembly 93 is inclined, and the rotating flow pipe 92 has an inclined surface inside. When the rotating flow pipe 92 and the closing insert plate 934 rotate, under the action of centrifugal force, impurities attached to the inclined surface inside the rotating flow pipe 92 and the inclined surface of the closing insert plate 934 will move along the inclined surface. The pump slides and eventually disengages from the inclined plane, thus avoiding blockage of the rotating flow pipe 92 and failure of the sealing surface of the closed insert plate 934 caused by impurities. When the self-priming stage of the self-priming centrifugal pump is completed and it enters the normal delivery stage, the pressure at the position of the liquid storage chamber 7 inside the pump body 1 increases. The pressure regulating component 94 is activated by the pressure inside the pump and drives the positioning transmission component 91 to disconnect the power transmission between it and the rotating flow pipe 92. The rotating flow pipe 92 and the centrifugal opening and closing component 93 stop rotating. The centrifugal opening and closing component 93 returns to its initial state and closes the return hole inside the rotating flow pipe 92, thereby avoiding power loss during the normal delivery stage of the self-priming centrifugal pump.

[0047] Compared with the prior art, the present invention replaces the traditional spring return valve structure with a centrifugal opening and closing component 93. The centrifugal force generated by the rotation of the centrifugal opening and closing component 93 driven by the drive pump shaft 3 directly drives the closing plate 934 to slide along the inclined surface inside the rotating flow pipe 92, realizing the full opening of the return hole inside the rotating flow pipe 92. This significantly increases the effective flow area of ​​the return hole during the self-priming stage, avoids clogging, and improves the self-priming efficiency. In addition, the closing plate 934 is inclined, and when it rotates, impurities on its sealing surface are also affected by centrifugal force, thereby greatly reducing the probability of impurities adhering to the sealing surface of the closing plate 934, thus ensuring its sealing performance after closing and avoiding power loss.

[0048] As a preferred embodiment, the pump body 1 is further provided with an intake chamber 5 and a gas-liquid separation chamber 6. The volute chamber 8 is in communication with both the intake chamber 5 and the gas-liquid separation chamber 6. The liquid storage chamber 7 is located below the intake chamber 5 and communicates with the gas-liquid separation chamber 6. Specifically, an inlet flange communicating with the intake chamber 5 and an outlet flange communicating with the gas-liquid separation chamber 6 are fixedly connected to the pump body 1. A bearing seat 2 that mates with the drive pump shaft 3 is fixedly installed at the end of the pump body 1 away from the inlet flange. A bearing seat 2 located at the end of the drive pump shaft 3 is fixedly fitted at the end of the drive pump shaft 3. The impeller 4 inside the volute chamber 8 drives the pump shaft 3 to rotate, which violently agitates the liquid inside the volute chamber 8 and the liquid flowing back into the volute chamber 8 along the liquid storage chamber 7, forming a gas-liquid mixture. Under the action of centrifugal force, the mixture is thrown into the gas-liquid separation chamber 6. Due to the density difference, the gas accumulates above the gas-liquid separation chamber 6 and is discharged along the outlet flange. The liquid flows back into the liquid storage chamber 7 under the action of gravity. This cycle is used to discharge the gas in the suction pipe and complete the self-priming process, allowing the self-priming centrifugal pump to enter the normal delivery stage.

[0049] As a preferred embodiment, the positioning transmission assembly 91 includes a transmission bevel gear disk 913, which is snapped onto the outside of the rotating flow pipe 92 for transmitting power. The transmission bevel gear disk 913 is driven to move axially along the rotating flow pipe 92. Specifically, the positioning transmission assembly 91 also includes a positioning tube 911, which is fixed inside the pump body 1. Its top end extends to the inlet position of the impeller 4 in the suction chamber 5, and its bottom end extends into the liquid storage chamber 7. A mounting base 912 is fixedly connected to the bottom end of the positioning tube 911. The rotating flow pipe 92 rotates... The drive bevel gear 913 is located inside the mounting base 912. The drive shaft is located inside the positioning tube 911 and at the end of the drive pump shaft 3. The drive bevel gear 913 is connected to the drive pump shaft 3 through the drive shaft and bevel gear. The contact position between the drive bevel gear 913 and the rotating flow tube 92 is provided with matching splines and keyways to ensure that the drive bevel gear 913 can drive the rotating flow tube 92 to rotate while the drive bevel gear 913 can be driven to move axially along the rotating flow tube 92.

[0050] As a preferred technical solution of this embodiment, the interior of the rotating flow tube 92 is provided with inclined surfaces that slope towards both ends. The interior of the rotating flow tube 92 forms a return hole through the two inclined surfaces. Specifically, the inclined surfaces inside the rotating flow tube 92 provide an installation position for the closing insert plate 934, ensuring that the opening and closing of the return hole can be controlled when the closing insert plate 934 is driven to slide along the inclined surface. When the rotating flow tube 92 is driven to rotate, when impurities are attached to the inclined surfaces inside the rotating flow tube 92, the impurities will slide on the inclined surfaces under the radial centrifugal force and eventually detach from the inclined surfaces, thereby avoiding blockage caused by the attachment of impurities inside the rotating flow tube 92.

[0051] As a preferred technical solution of this embodiment, the centrifugal opening and closing assembly 93 includes a closing insert plate 934, which is slidably installed on the inclined surface of the rotating flow tube 92 near the volute chamber 8. Several closing insert plates 934 are gathered together to form a complete cone shape, and the inclination angle of the cone is adapted to the inclined surface. Specifically, there are multiple centrifugal opening and closing assemblies 93, which are evenly distributed on the rotating flow tube 92. A positioning slider is provided on the outside of the closing insert plate 934 near the volute chamber 8, and a positioning groove that cooperates with the slider is opened on the inclined surface of the rotating flow tube 92. Through the cooperation of the positioning slider and the positioning groove, the closing insert plate 934 is stably connected to the rotating flow tube 92, and the stable sliding of the closing insert plate 934 is also ensured. The closing insert plate 934 is inclined on the inclined surface inside the rotating flow tube 92. When it rotates, impurities on the inclined surface of the closing insert plate 934 will slide on the inclined surface under the action of radial centrifugal force and eventually detach, which greatly reduces the probability of impurities adhering to the sealing surface of the closing insert plate 934, thereby ensuring its sealing performance after closing.

[0052] As a preferred technical solution in this embodiment, the closed inserts 934 can seal the reflux hole inside the rotating flow pipe 92 after they are brought together. The inner wall of the closed inserts 934 is provided with a slope near the tip. Specifically, after the pressure regulating component 94 disconnects the power connection of the rotating flow pipe 92 under pressure, the closed inserts 934 in the centrifugal opening and closing component 93 return to the initial state, and the closed inserts 934 re-bring together to seal the reflux hole, thereby avoiding internal leakage of the self-priming centrifugal pump during normal conveying, which would lead to a decrease in pump power. It should be noted that if the inner wall of the closed inserts 934 is not provided with a slope near the tip, the closed inserts 934 will stick together after they are brought together. When the position is flat, the impurities attached to the position are difficult to detach under centrifugal force when the closed inserts 934 rotate, and the gaps will exist after the closed inserts 934 are brought together due to the influence of the attached substances.

[0053] As a preferred technical solution of this embodiment, the centrifugal opening and closing assembly 93 includes a centrifugal drive block 933 and a speed-changing drive unit. The centrifugal drive block 933 is connected to the closing insert plate 934 through the speed-changing drive unit. When the rotating flow pipe 92 rotates, the centrifugal drive block 933 is driven by centrifugal force to move the closing insert plate 934 towards the side closer to the volute chamber 8. Specifically, when the rotating flow pipe 92 is driven to rotate the centrifugal opening and closing assembly 93, the centrifugal drive block 933 is driven by centrifugal force to move outward of the rotating flow pipe 92, and drives the closing insert plate 934 to move through the speed-changing drive unit, thereby releasing the blockage of the internal return hole of the rotating flow pipe 92 by the closing insert plate 934. After the closing insert plate 934 moves to the end, the return hole is fully opened, which greatly increases the effective flow area of ​​the return hole in the self-priming stage and avoids the blockage phenomenon.

[0054] As a preferred embodiment, the transmission drive unit includes a transmission gear 931, which is connected to the closing insert plate 934; a transmission gear 936, which is fixedly connected to the transmission gear 931; and a transmission rack 932, which is fixedly connected to the centrifugal drive block 933 and meshes with the transmission gear 936. Specifically, the rotating flow pipe 92 has a mounting cavity that cooperates with the centrifugal opening and closing assembly 93, and a sealing plate is fixedly installed at the end of the mounting cavity by screws. A pin is fixedly installed in the mounting cavity, and both the transmission gear 931 and the transmission gear 936 are movably mounted on the pin. An opening and closing rack 935 that cooperates with the transmission gear 931 is provided on the side of the closing insert plate 934 away from the central axis of the rotating flow pipe 92, and the transmission rack 932 is movably mounted on the sealing plate. The transmission gear 931 has a mechanism that cooperates with the pin inside. The reset coil spring 937; when the centrifugal drive block 933 moves outward under the action of centrifugal force, it drives the transmission rack 932 to drive the speed change gear 936 and the transmission gear 931 to rotate, and then drives the closing plate 934 to move through the opening and closing rack 935, thereby realizing the adjustment of the position of the closing plate 934; when the rotating flow pipe 92 stops rotating, the reset coil spring 937 applies a spring force to the transmission gear 931, which can reset the transmission gear 931, the transmission rack 932, and the centrifugal drive block 933; it should be noted that since the stroke of the closing plate 934 is greater than the stroke of the transmission rack 932 and the centrifugal drive block 933, the transmission ratio between the speed change gear 936 and the transmission gear 931 is based on the requirement that the closing plate 934 can complete its stroke simultaneously when the centrifugal drive block 933 and the transmission rack 932 are formed.

[0055] As a preferred embodiment, the pressure regulating component 94 corresponds one-to-one with the centrifugal opening and closing component 93. The pressure regulating component 94 includes a main regulating part, which is connected to the transmission bevel gear disk 913 for adjusting the axial position of the transmission bevel gear disk 913 according to the pump pressure. Specifically, the main regulating part includes a first-stage cylinder 941, which is fixedly mounted on the rotating flow pipe 92; a first-stage piston 942, which is movably mounted inside the first-stage cylinder 941; and a transmission arm 943, which is fixedly connected to one end of the first-stage piston 942. The end of the transmission arm 943 away from the first-stage piston 942 passes through the mounting base 912 and is fixedly connected to the transmission bevel gear disk 913. After the self-priming stage of the self-priming centrifugal pump is completed, it enters the normal conveying stage. During this period, the pressure at the liquid storage chamber 7 inside the pump body 1 increases. The first-stage piston 942, under pressure, compresses the gas inside the first-stage cylinder 941. The first-stage piston 942 drives the transmission bevel gear disk 913 to move away from the bevel gear through the transmission arm 943, thereby disconnecting the power connection between the rotating flow pipe 92 and the drive pump shaft 3, thus stopping the rotation of the rotating flow pipe 92 and resetting the centrifugal opening and closing assembly 93. The transmission arm 943 has a "Z" shaped cross section, and a slot that cooperates with the centrifugal drive block 933 is provided at the bend below. During the power disconnection phase, when the transmission arm 943 is driven to move, the slot can engage with the centrifugal drive block 933 that has been reset to the position, thereby achieving auxiliary locking of the closed insert plate 934.

[0056] As a preferred technical solution in this embodiment, the pressure regulating component 94 further includes a pressure-triggered release section, which is disposed on the main regulating section to enable the main regulating section to achieve instantaneous release. It should be noted that as the self-priming stage of the self-priming centrifugal pump progresses, the pressure at the position of the liquid storage chamber 7 inside the pump gradually increases. This causes the first-stage piston 942 to be driven by the pressure change to gradually move the transmission bevel gear disk 913 before the self-priming stage is completed, which in turn leads to instability in the power transmission of the transmission bevel gear disk 913. Therefore, a pressure-triggered release section is provided to enable the main regulating section to achieve instantaneous release. The pressure-triggered release section includes a second-stage cylinder 944, which is fixedly installed on the first-stage cylinder 941; a second-stage piston 945, which is movably fitted inside the second-stage cylinder 944, and a top pin is provided at the bottom of the second-stage piston 945; and an elastic pin 946, which is engaged inside the first-stage piston 942, and the elastic pin 946 and the second-stage piston 945 are initially aligned. The first-stage cylinder 941 has a locking pin hole that mates with the elastic pin 946. In the initial state, the elastic pin 946 is inserted into the locking pin hole under the action of elastic force. As the self-priming stage proceeds, the pressure at the position of the liquid storage chamber 7 in the pump gradually increases. The second-stage piston 945 is compressed by the pressure, which compresses the gas inside the second-stage cylinder 944, causing the top pin to move closer to the first-stage cylinder 941. The top pin presses against the elastic pin 946 in the pin hole. When the self-priming stage is completed, the pump enters the normal delivery stage, and the pressure inside the pump reaches the threshold. At this time, the top pin completely pushes the elastic pin 946 away from the locking pin hole, releasing the lock on the position of the first-stage piston 942. At this time, the first-stage piston 942 is compressed and can drive the transmission arm 943 to move instantaneously, realizing the instantaneous disconnection of the power input of the rotating flow pipe 92. It should be noted that, in order to reduce the friction between the periphery of the elastic pin 946 and the inner wall of the locking pin hole, ball bearings can be installed on the periphery of the elastic pin 946.

[0057] All electrical components involved in this application are existing technologies. Those skilled in the art can select appropriate models of electrical components according to their needs. No restrictions or elaborations are made here. Those skilled in the art understand their connection methods. With the help of those skilled in the art, all electrical components in this application and their compatible power supplies can be connected by wires. And according to the actual situation, appropriate controllers can be selected to meet control requirements.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-efficiency self-priming centrifugal pump, comprising a pump body (1) and a drive pump shaft (3), wherein the pump body (1) is provided with a liquid storage chamber (7) and a volute chamber (8), characterized in that, It also includes a reflux valve mechanism (9), which is disposed on the reflux channel between the liquid storage chamber (7) and the volute chamber (8), and includes: Positioning transmission assembly (91) is used to support and transmit power; The rotating flow pipe (92) is rotatably mounted on the positioning transmission assembly (91) and is connected to the drive pump shaft (3) in a transmission connection. Centrifugal opening and closing assembly (93) is located inside the rotating flow tube (92) and is used to control the opening and closing of the reflux channel by centrifugal force; The pressure regulating component (94) is located on the rotating flow pipe (92) and is used to adjust the power transmission state of the positioning transmission component (91) according to the pressure inside the pump. When the pump body (1) is in the self-priming stage, the pump shaft (3) drives the rotating flow pipe (92) to rotate through the positioning transmission component (91), and the centrifugal opening and closing component (93) opens the return channel under the action of centrifugal force. When the pump body (1) is in the normal conveying stage, the pressure inside the pump body (1) increases, the pressure regulating component (94) disconnects the power transmission of the positioning transmission component (91) under pressure, and the centrifugal opening and closing component (93) returns to the initial state and closes the return channel.

2. The high-efficiency self-priming centrifugal pump according to claim 1, characterized in that, The pump body (1) is also provided with an intake chamber (5) and a gas-liquid separation chamber (6). The volute chamber (8) is connected to the intake chamber (5) and the gas-liquid separation chamber (6). The liquid storage chamber (7) is located below the intake chamber (5) and is connected to the gas-liquid separation chamber (6).

3. The high-efficiency self-priming centrifugal pump according to claim 1, characterized in that, The positioning transmission assembly (91) includes a transmission bevel gear disk (913), which is engaged with the outside of the rotating flow pipe (92) for transmitting power; the transmission bevel gear disk (913) is driven to move axially along the rotating flow pipe (92).

4. The high-efficiency self-priming centrifugal pump according to claim 1, characterized in that, The interior of the rotating flow tube (92) is provided with inclined surfaces that slope towards both ends, and the interior of the rotating flow tube (92) forms a return hole through the two inclined surfaces.

5. A high-efficiency self-priming centrifugal pump according to claim 4, characterized in that, The centrifugal opening and closing assembly (93) includes a closing insert (934), which is slidably installed on the inclined surface of the rotating flow tube (92) near the volute chamber (8). Several closing inserts (934) are gathered together to form a complete cone shape, and the tilt angle of the cone shape is adapted to the inclined surface.

6. A high-efficiency self-priming centrifugal pump according to claim 5, characterized in that, After several of the closed inserts (934) are brought together, they can block the reflux hole inside the rotating flow pipe (92). The inner wall of the closed insert (934) is provided with an inclined surface near the tip.

7. A high-efficiency self-priming centrifugal pump according to claim 5, characterized in that, The centrifugal opening and closing assembly (93) includes a centrifugal drive block (933) and a speed-changing drive unit. The centrifugal drive block (933) is connected to the closing insert plate (934) through the speed-changing drive unit. When the rotating flow tube (92) rotates, the centrifugal drive block (933) is driven by centrifugal force to move the closing insert plate (934) closer to the volute chamber (8).

8. A high-efficiency self-priming centrifugal pump according to claim 7, characterized in that, The speed change drive unit includes a transmission gear (931) which is connected to the closing insert plate (934) for transmission; a speed change gear (936) which is fixedly connected to the transmission gear (931); and a transmission rack (932) which is fixedly connected to the centrifugal drive block (933) and meshes with the speed change gear (936).

9. A high-efficiency self-priming centrifugal pump according to claim 3, characterized in that, The pressure regulating component (94) corresponds one-to-one with the centrifugal opening and closing component (93). The pressure regulating component (94) includes a main regulating part, which is connected to the transmission bevel gear disk (913) for adjusting the axial position of the transmission bevel gear disk (913) according to the pump pressure.

10. A high-efficiency self-priming centrifugal pump according to claim 9, characterized in that, The pressure regulating component (94) also includes a pressure-triggered release section, which is disposed on the main regulating section and is used to enable the main regulating section to release instantaneously.

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