A centrifugal pump

Abstract

The present invention belongs to the field of pump technology. The present invention discloses a centrifugal pump, comprising a pump casing, a pump cover fixedly mounted on the pump casing, an impeller rotatably arranged in the cavity of the pump casing, a piston chamber provided in the pump cover, a piston ring provided in the piston chamber, and the piston ring rotates synchronously with the impeller; a sliding pin and a return spring are fixedly arranged in the piston chamber, a groove is provided on one end face of the piston ring, and a return spring is provided on the other end of the piston ring to push it axially against the sliding pin, and the cavity of the pump casing is connected to the water source through the piston chamber; during the rotation of the piston ring, the sliding pin slides on one end face of the piston ring. The rotation of the impeller drives the piston ring to slide back and forth, thereby pumping water from the water source into the pump casing for automatic exhaust. After the outlet of the pump casing is drained normally, the water pressure at the outlet of the pump casing increases, the water flow pushes the reversing valve stem to move, the piston chamber is connected to the cleaning and pressurizing channel, the water flows into the installation pipe to flush the filter screen, and the water flows into the inlet of the pump casing to increase the water pressure and reduce the suction phenomenon.

Description

Technical Field

[0001] The invention belongs to the technical field of pumps, and in particular relates to a centrifugal pump. Background Art

[0002] A centrifugal pump is a machine that transports liquids or pressurizes liquids. It transfers the mechanical energy of the prime mover to the liquid, increasing the pressure of the liquid. Existing centrifugal pumps are generally composed of a pump body, a bracket body, a pump shaft, an inner pump casing, a front liner, a rear liner, an impeller, a sealing packing, etc. Currently, centrifugal pumps are widely used in mining, metallurgy, electric power, chemical industry and other industries. However, there are still the following problems when using centrifugal pumps:

[0003] 1. Since the centrifugal pump cannot self-prime when it starts to move, it is necessary to inject water into the casing to exhaust the air before use to ensure the normal operation of the centrifugal pump. However, since artificial exhaust requires the use of a funnel or an external positive displacement pump, the exhaust process is very troublesome.

[0004] 2. Generally, a filter screen is required at the water inlet of a centrifugal pump to prevent impurities from entering the centrifugal pump and causing damage to the parts, or even causing the centrifugal pump to get stuck and damage the motor during operation. However, the filter screen needs to be cleaned after long-term use. However, in the prior art, to clean the filter screen, the centrifugal pump needs to be shut down and then the filter screen needs to be removed for cleaning. This process not only affects the working process of the centrifugal pump, but also has a huge workload and is very cumbersome.

[0005] 3. Due to the poor self-priming ability of the centrifugal pump, cavitation often occurs when the centrifugal pump is working normally, causing cavitation in the internal parts of the centrifugal pump and causing a certain degree of damage to the parts. Summary of the Invention

[0006] In order to solve the above problems in the prior art, the present invention proposes a centrifugal pump. The centrifugal pump comprises a pump casing, a pump cover fixedly mounted on the pump casing, an impeller rotatably arranged in a cavity of the pump casing, a piston cavity provided in the pump cover, a piston ring provided in the piston cavity, and the piston ring rotates synchronously with the impeller; a sliding pin and a return spring are fixedly provided in the piston cavity, a groove is provided on one end face of the piston ring, the connection between the groove and the end face of the piston ring is an inclined surface for the sliding pin to slide through, a return spring is provided on the other end of the piston ring to push it to axially contact the sliding pin, and the cavity of the pump casing is connected to a water source through the piston cavity; during the rotation of the piston ring, the sliding pin slides on one end face of the piston ring, and when the sliding pin slides from the inclined surface through the groove, it cooperates with the return spring to control the piston ring to slide axially back and forth in the piston cavity to pump water from the water source into the cavity of the pump casing for automatic exhaust; a reversing channel, a cleaning and pressurizing channel and a diverter cavity are provided in the pump cover, an elastic reversing valve is provided in the reversing channel, and the outlet of the pump casing is connected to the reversing channel through a first connecting pipe; a cleaning connection port and a pressurizing connection port are provided on the pump cover, one end of the diverter cavity is connected to the outlet of the cleaning and pressurizing channel, and the other end of the diverter cavity is connected to the outlet of the cleaning and pressurizing channel. One end is connected with the cleaning connection port and the pressurizing connection port, a mounting pipe is provided at the inlet of the pump casing, the cleaning connection port is communicated with the mounting pipe through the second connecting pipe, and the pressurizing connection port is communicated with the inlet of the pump casing through the third connecting pipe; a rotating frame is provided on the pump casing, and a plurality of filter screens are installed on the rotating frame, one of the filter screens is located in the inlet of the pump casing, and the other filter screens are located in the mounting pipe, and the filter screen in the mounting pipe is rotated to the inlet of the pump casing by rotating the rotating frame, and the filter screen in the inlet of the pump casing is rotated to the mounting pipe at the same time; in a natural state, the elastic exchange The directional valve controls the piston chamber to be connected with the cavity of the pump casing through the reversing channel, and the piston chamber is not connected with the cleaning and pressurizing channel. When the outlet of the pump casing is drained normally, the outlet water pressure increases to drive the elastic reversing valve to move, so that the piston chamber is connected with the cleaning and pressurizing channel, and the piston chamber is not connected with the cavity of the pump casing. The water flows from the piston chamber through the reversing channel and the cleaning and pressurizing channel into the second connecting pipe and the third connecting pipe. The water flows from the second connecting pipe into the installation pipe to flush the replaced filter screen, and the water flows into the inlet of the pump casing from the third connecting pipe.

[0007] Optionally, a mounting rod is fixedly provided on the impeller and extends into the piston cavity. The mounting rod is parallel to the rotation axis of the impeller. The mounting rod passes through the piston ring. The piston ring is slidably limited on the mounting rod. A return spring is sleeved on the mounting rod. One end of the return spring contacts the impeller, and the other end of the return spring contacts the piston ring.

[0008] Optionally, a sliding switch for controlling the opening and closing of the cleaning connection port and the pressurizing connection port is slidingly set inside the pump cover, and touch sliders radially extending into the piston cavity are fixedly set at opposite ends of the sliding switch along its sliding direction. When the mounting rod rotates in the piston cavity with the impeller, the mounting rod alternately pushes the two touch sliders to move radially, driving the sliding switch to slide back and forth, thereby controlling the opening and closing of the cleaning connection port and the pressurizing connection port.

[0009] Optionally, the mounting tube is fixedly arranged on the side of the pump casing inlet, the axis of the mounting tube is parallel to the axis of the pump casing inlet, the rotating shaft of the rotating frame is located between the mounting tube and the pump casing inlet, and a rotating handle extending out of the pump casing is fixedly arranged on the rotating frame.

[0010] Optionally, the elastic reversing valve includes a reversing spring and a reversing valve stem, and a first reversing groove and a second reversing groove are axially spaced apart on the reversing valve stem. The outlet of the piston chamber is located between the cleaning and pressurizing channel and the cavity of the pump casing. The first reversing groove is used to connect the piston chamber and the cleaning and pressurizing channel, and the second reversing groove is used to connect the piston chamber and the cavity of the pump casing. One end of the reversing spring is in conflict with one end of the reversing valve stem, and the other end of the reversing spring is in conflict with the end wall of the reversing channel. The other end of the reversing channel has an opening connected to the outlet of the pump casing.

[0011] Optionally, one-way valves are provided at both the inlet and the outlet of the piston chamber.

[0012] Optionally, a first connection port is opened on the side wall of the pump casing near the inlet, and the first connection port is connected to the pressurized connection port on the pump cover through a third connecting pipe. Water flows through the first connection port into the inlet of the pump casing and enters the cavity of the pump casing through the filter screen.

[0013] Optionally, a second connecting port is provided on a side wall of the pump housing close to the outlet, and the second connecting port is communicated with the reversing channel in the pump cover through the first connecting pipe.

[0014] Optionally, the piston cavity is an annular cavity, a pump shaft is rotatably provided on the pump cover, the pump shaft is connected to the impeller, and the rotation axis of the pump shaft coincides with that of the piston ring.

[0015] Optionally, a disassembly port for disassembling and assembling the piston ring is provided at the inner end of the pump cover.

[0016] The centrifugal pump of the present invention has the following beneficial technical effects:

[0017] 1. In the centrifugal pump of the present invention, a mounting rod is provided behind the impeller so that the mounting rod can drive the piston ring to rotate when the impeller rotates. At the same time, through the cooperation between the groove on the piston ring and the sliding pin, and under the action of the return spring, when the impeller rotates, the piston ring not only rotates with the impeller, but also reciprocates in the axial direction, thereby changing the size of the piston cavity, forming a piston pump, which can suck in and discharge water in the water source, and under the action of the elastic reversing valve, the water can be discharged into the casing of the centrifugal pump to exhaust the centrifugal pump, thereby realizing automatic exhaust of the centrifugal pump.

[0018] 2. In the centrifugal pump of the present invention, a rotating frame is provided on the pump housing, and two filter screens are provided on the rotating frame. The filter screens can be switched by rotating the rotating frame, so that the filter screens can be replaced at any time when the centrifugal pump is working.

[0019] 3. In the centrifugal pump of the present invention, a mounting rod and a touch slider are arranged behind the impeller, so that when the impeller drives the mounting rod to rotate, it pushes the touch slider to move, and drives the sliding switch to perform reciprocating motion. The water flowing through the sliding switch will be divided into two paths, and the flow rates of the two paths are the same.

[0020] 4. In the centrifugal pump of the present invention, the elastic reversing valve is set so that when the centrifugal pump is working normally and the pressure at its water outlet is high, the elastic reversing valve will be controlled to reverse, so that the water pumped out by the piston pump changes its flow direction and flows into the flow channel where the sliding switch is located. After the action of the sliding switch, the water pumped out by the piston pump is divided into two paths and discharged, and one path of high-pressure water flow is introduced into the back of the external filter screen at the installation pipe to reversely flush and clean the filter screen; the other path is introduced into the inlet of the pump casing, thereby increasing the water suction pressure at the inlet of the pump casing, thereby reducing the suction phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the present invention;

[0022] Figure 2 For the present invention Figure 1 Cross-sectional view in the AA direction;

[0023] Figure 3 For the present invention Figure 1 Cross-sectional view in the middle BB direction;

[0024] Figure 4 For the present invention Figure 3 Cross-sectional view in CC direction;

[0025] Figure 5 For the present invention Figure 1 Cross-sectional view in the middle DD direction;

[0026] Figure 6 It is the appearance diagram of the piston ring of the present invention.

[0027] Figure numerals: 1. Pump casing; 11. Cavity; 12. First connection port; 13. Second connection port; 2. Pump cover; 21. Piston chamber; 211. First one-way valve; 212. Second one-way valve; 22. Piston ring; 221. Groove; 222. Inclined surface; 23. Sliding pin; 24. Return spring; 25. Reversing channel; 26. Cleaning and pressurizing channel; 27. Diverter chamber; 28. Cleaning connection port; 29. ​​Pressurizing connection port; 3. Impeller; 31. Mounting rod; 32. Pump shaft; 4. Elastic reversing valve; 41. Reversing valve rod; 411. First reversing groove; 412. Second reversing groove; 42. Reversing spring; 5. Mounting pipe; 6. Rotating frame; 61. Filter screen; 62. Rotating handle; 7. Sliding switch; 71. Touch slider; 72. Flow groove. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] like Figures 1-6As shown, this embodiment provides a centrifugal pump, including a pump casing 1, a pump cover 2 fixedly mounted on the pump casing 1, an impeller 3 rotatably arranged in the cavity 11 of the pump casing 1, a piston cavity 21 is provided in the pump cover 2, a piston ring 22 is provided in the piston cavity 21, and the piston ring 22 rotates synchronously with the impeller 3; a sliding pin 23 and a return spring 24 are fixedly provided in the piston cavity 21, a groove 221 is provided on one end surface of the piston ring 22, and a connection between the groove 221 and the end surface of the piston ring 22 is an inclined surface 222 for the sliding pin 23 to slide through, so that the sliding pin 23 slides from the end surface of the piston ring 22 through the inclined surface 222 into the groove 221, and it is also convenient for the sliding pin 23 to slide from the groove 221 through the inclined surface 222 to the piston ring 22 On the end surface of the piston ring 22, the other end of the piston ring 22 is provided with a return spring 24 that pushes it to axially resist the sliding pin 23, and the cavity 11 of the pump housing 1 is connected to the water source through the piston cavity 21; during the rotation of the piston ring 22, the sliding pin 23 slides on one end surface of the piston ring 22, and when the sliding pin 23 slides from the inclined surface 222 through the groove 221, it cooperates with the return spring 24 to control the piston ring 22 to slide axially back and forth in the piston cavity 21 to pump water from the water source into the cavity 11 of the pump housing 1 for automatic exhaust; a reversing channel 25, a cleaning and pressurizing channel 26 and a diverter cavity 27 are provided in the pump cover 2, and an elastic reversing valve 4 is provided in the reversing channel 25, and the outlet of the pump housing 1 is connected to the reversing channel 25 through the first connecting pipe. The upper end opening is connected; a cleaning connection port 28 and a pressurizing connection port 29 are provided on the pump cover 2, one end of the diverter chamber 27 is connected to the outlet of the cleaning pressurizing channel 26, and the other end of the diverter chamber 27 is connected to the cleaning connection port 28 and the pressurizing connection port 29. A mounting pipe 5 is provided at the inlet of the pump casing 1, and the cleaning connection port 28 is connected to the mounting pipe 5 through a second connecting pipe, and the pressurizing connection port 29 is connected to the inlet of the pump casing 1 through a third connecting pipe; a rotating frame 6 is provided on the pump casing 1, and a plurality of filters 61 are installed on the rotating frame 6, one of the filters 61 is located in the inlet of the pump casing 1, and the other filters 61 are located in the mounting pipe 5. By rotating the rotating frame 6, a filter 61 in the mounting pipe 5 is rotated to the inlet of the pump casing 1, and at the same time, The filter screen 61 in the inlet of the pump casing 1 rotates into the mounting tube 5; in the natural state, the elastic reversing valve 4 controls the piston chamber 21 to be connected with the cavity 11 of the pump casing 1 through the reversing channel 25, and the piston chamber 21 is not connected with the cleaning and pressurizing channel 26. When the outlet of the pump casing 1 is drained normally, the outlet water pressure increases to drive the elastic reversing valve 4 to move, so that the piston chamber 21 is connected with the cleaning and pressurizing channel 26, and the piston chamber 21 is not connected with the cavity 11 of the pump casing 1. The water flows from the piston chamber 21 through the reversing channel 25 and the cleaning and pressurizing channel 26 into the second connecting pipe and the third connecting pipe. The water flows from the second connecting pipe into the mounting tube 5 to flush the replaced filter screen 61, and the water flows from the third connecting pipe into the inlet of the pump casing 1.

[0031] Through the above arrangement, the piston ring 22 and the piston chamber 21 form a piston pump structure. The rotation of the impeller 3 drives the piston ring 22 to slide back and forth in the piston chamber 21, thereby pumping water from the water source into the piston chamber 21, and then pumping the water in the piston chamber 21 out to the pump housing 1 for automatic exhaust. The exhaust is convenient and efficient. In addition, after the outlet of the pump housing 1 is drained normally, the water pressure at the outlet of the pump housing 1 increases, thereby increasing the water pressure in the reversing channel 25. The water flow pushes the reversing valve stem 41 to move, disconnecting the piston chamber 21 from the cavity 11 of the pump housing 1. The piston chamber 21 is connected to the cleaning and pressurizing channel 26. The water flows through the second connecting pipe into the installation pipe 5 to flush the replaced filter screen 61. The water flows through the third connecting pipe into the inlet of the pump housing 1 to increase the water pressure and reduce the suction phenomenon.

[0032] In the centrifugal pump of this embodiment, a mounting rod 31 is fixedly provided on the impeller 3 and extends into the piston cavity 21. The mounting rod 31 is parallel to the rotation axis of the impeller 3. The mounting rod 31 passes through the piston ring 22. The piston ring 22 is slidably limited on the mounting rod 31. A return spring 24 is sleeved on the mounting rod 31. One end of the return spring 24 contacts the impeller 3, and the other end of the return spring 24 contacts the piston ring 22.

[0033] Through the above-mentioned arrangement, the mounting rod 31 is used to install the piston ring 22, driving the piston ring 22 to rotate with the impeller 3, and at the same time plays a limiting role during the sliding process of the piston ring 22, thereby improving the sliding stability of the piston ring 22. In addition, the return spring 24 is installed on the mounting rod 31, thereby improving the assembly stability of the return spring 24.

[0034] In the centrifugal pump of this embodiment, a sliding switch 7 for controlling the opening and closing of the cleaning connection port 28 and the pressurizing connection port 29 is slidingly set in the pump cover 2. Touch sliders 71 radially extending into the piston cavity 21 are fixedly set at the opposite ends of the sliding switch 7 along its sliding direction. When the mounting rod 31 rotates in the piston cavity 21 with the impeller 3, the mounting rod 31 alternately pushes the two touch sliders 71 to move radially, driving the sliding switch 7 to slide back and forth, thereby controlling the opening and closing of the cleaning connection port 28 and the pressurizing connection port 29.

[0035] Through the above-mentioned setting, the setting of the sliding switch 7 allows water to flow alternately into the second connecting pipe and the third connecting pipe, thereby increasing the water pressure for cleaning the filter 61 and the water pressure at the inlet of the pressurized pump housing 1, and achieving better cleaning and air suction prevention effects.

[0036] In the centrifugal pump of this embodiment, the mounting tube 5 is fixedly arranged on the side of the inlet of the pump casing 1, the axis of the mounting tube 5 is parallel to the axis of the inlet of the pump casing 1, the rotating axis of the rotating frame 6 is located between the mounting tube 5 and the inlet of the pump casing 1, and a rotating handle 62 extending outside the pump casing 1 is fixedly provided on the rotating frame 6.

[0037] Through the above arrangement, the mounting tube 5 is parallel to the axis of the pump inlet, making it easier to assemble the filter screen 61 after switching, and the assembly sealing is good. The rotating frame 6 is rotated by turning the handle 62, which is easy to operate.

[0038] In the centrifugal pump of this embodiment, the elastic reversing valve 4 includes a reversing spring 42 and a reversing valve stem 41. The reversing valve stem 41 has a first reversing groove 411 and a second reversing groove 412 axially spaced apart. The outlet of the piston chamber 21 is located between the cleaning and pressurizing channel 26 and the cavity 11 of the pump casing 1. The first reversing groove 411 is used to connect the piston chamber 21 with the cleaning and pressurizing channel 26, and the second reversing groove 412 is used to connect the piston chamber 21 with the cavity 11 of the pump casing 1. One end of the reversing spring 42 is in contact with one end of the reversing valve stem 41, and the other end of the reversing spring 42 is in contact with the end wall of the reversing channel 25. The other end of the reversing channel 25 has an opening connected to the outlet of the pump casing 1.

[0039] Through the above arrangement, in the natural state, the reversing spring 42 is in a naturally extended state, so that the outlet of the piston chamber 21 is connected to the cavity 11 of the pump casing 1 through the second reversing groove 412. After the water pressure increases and the reversing valve stem 41 moves downward, the outlet of the piston chamber 21 and the cleaning pressurization channel 26 are located in the first reversing groove 411, so that the piston chamber 21 is connected to the cleaning pressurization channel 26, and the piston chamber 21 is not connected to the cavity 11 of the pump casing 1. The structure is simple and the reversing is automatic, which saves operation time and labor.

[0040] In the centrifugal pump of this embodiment, one-way valves are provided at both the inlet and outlet of the piston chamber 21 to prevent water from flowing back. Specifically, the inlet of the piston chamber 21 is provided with a first one-way valve 211, and the outlet of the piston chamber 21 is provided with a second one-way valve 212.

[0041] In the centrifugal pump of this embodiment, a first connecting port 12 is opened on the side wall of the pump casing 1 near the inlet. The first connecting port 12 is connected to the pressurized connecting port 29 on the pump cover 2 through a third connecting pipe. Water flows through the first connecting port 12 into the inlet of the pump casing 1 and enters the cavity 11 of the pump casing 1 through the filter screen 61.

[0042] Through the above arrangement, the water flows through the filter 61 and then enters the cavity 11 of the pump housing 1 , thereby preventing impurities in the water source from entering the cavity 11 of the pump housing 1 .

[0043] In the centrifugal pump of this embodiment, a second connection port 13 is formed on the side wall of the pump housing 1 near the outlet, and the second connection port 13 is connected to the reversing channel 25 in the pump cover 2 through a first connecting pipe. The structure is simple and the installation cost is low.

[0044] In the centrifugal pump of this embodiment, the piston cavity 21 is an annular cavity 11. A pump shaft 32 is rotatably mounted on the pump cover 2 and connected to the impeller 3. The rotation axis of the pump shaft 32 coincides with the rotation axis of the piston ring 22. This results in a compact and regular structure, reduced size, and good operational stability.

[0045] In the centrifugal pump of this embodiment, a disassembly opening for disassembling and assembling the piston ring 22 is provided at the inner end of the pump cover 2, so as to facilitate disassembly and assembly of the piston ring 22.

[0046] In the centrifugal pump of this embodiment, the first connecting pipe, the second connecting pipe and the third connecting pipe are all connected by rubber hoses.

[0047] The centrifugal pump of this embodiment has the following specific working principle:

[0048] When using the centrifugal pump of this embodiment, the inlet of the piston chamber 21 is connected to the water source, and the second connecting port 13 is connected to the reversing channel 25 with a hose, the cleaning connecting port 28 is connected to the installation pipe 5 with a hose, and the pressurizing connecting port 29 is connected to the first connecting port 12 with a hose. Then, the inlet of the pump housing 1 is connected to the water source, and the outlet of the pump housing 1 is connected to the delivery pipeline.

[0049] Then start the motor to drive the pump shaft 32 to rotate, and then drive the impeller 3 to rotate, and drive the piston ring 22 to rotate through the mounting rod 31. Due to the action of the return spring 24, the piston ring 22 is pushed upward, so that the piston ring 22 is always pressed against the sliding pin 23. When the sliding pin 23 slides out of the groove 221, the piston ring 22 moves downward. When the sliding pin 23 enters the groove 221, the piston ring 22 moves upward under the action of the return spring 24, so that while the piston ring 22 rotates, the piston ring 22 reciprocates in the axial direction, thereby expanding and compressing the volume of the piston chamber 21. Under the action of the one-way valve, a piston pump is formed, so that when the piston ring 22 drops, water in the water source is discharged from the water source. The inlet of the piston chamber 21 is sucked into the piston chamber 21 through the first one-way valve 211. When the piston ring 22 rises, the water in the piston chamber 21 is compressed and discharged through the second one-way valve 212. Since there is no pressure at the outlet of the pump casing 1 at this time, the second reversing groove 412 of the reversing valve rod 41 is in a position where the outlet of the piston chamber 21 and the cavity 11 of the pump casing 1 are connected under the action of the reversing spring 42, so that the water that has passed through the second one-way valve 212 flows through the second reversing groove 412 and enters the cavity 11 of the pump casing 1 for automatic exhaust. When the air in the cavity 11 of the pump casing 1 is discharged, the centrifugal pump operates normally, sucking water from the inlet of the pump casing 1, and after the impeller 3 increases the pressure, the water is discharged again. It is discharged from the outlet of the pump housing 1. At this time, the high-pressure water at the outlet of the pump housing 1 flows out of the second connecting port 13 and flows into the reversing channel 25 through the hose, overcoming the reversing spring 42 to push the reversing valve stem 41 to move and reverse, so that the first reversing groove 411 is in a position where the outlet of the second one-way valve 212 and the cleaning pressurizing channel 26 are connected, so that the water pumped out from the piston chamber 21 passes through the second one-way valve 212 and then flows through the first reversing groove 411, and then enters the diverter chamber 27 through the cleaning pressurizing channel 26. At the same time, when the mounting rod 31 rotates, the mounting rod 31 touches the inclined surface of the first touch slider 71, which pushes the touch slider 71 to contract, and when it contracts, it drives the second touch slider 71 to radially extend into the piston chamber. 21, and after the mounting rod 31 touches the inclined surface of the second touch slider 71, it will push the second touch slider 71 to retract, and at the same time drive the first touch slider 71 to extend, so that when the mounting rod 31 keeps rotating, it will drive the sliding switch 7 to make a reciprocating motion. During the reciprocating motion of the sliding switch 7, the flow groove 72 on the sliding switch 7 can alternately connect the cleaning connection port 28 and the pressurizing connection port 29 with the diverter chamber 27, so that the water in the diverter chamber 27 is diverted and flows out from the second connecting pipe and the third connecting pipe respectively. Since the impeller 3 rotates at a high speed, the switching frequency of the sliding switch 7 is high, so that the cleaning connection port 28 and the pressurizing connection port 29 will not be interrupted, so that water flows out continuously.

[0050] The water flowing out of the pressurized connection port 29 enters the first connection port 12 through the third connection pipe, increasing the water inlet pressure at the inlet of the pump casing 1, thereby reducing the cavitation phenomenon of the centrifugal pump; at the same time, the water flowing out of the cleaning connection port 28 enters the installation pipe 5 through the second connection pipe, rushes on the filter screen 61, and reversely flushes and cleans the filter screen 61, so that the impurities in front of the filter screen 61 fall off. After long-term use, the rotating frame 6 can be driven to rotate by rotating the handle 62, and the cleaned filter screen 61 can be replaced, and the replaced filter screen 61 can be flushed and cleaned, so that the filter screen 61 can be cleaned without stopping the machine for disassembly, and the service life of the two filters 61 will also be extended.

Claims

1. A centrifugal pump, characterized in that: The invention comprises a pump housing (1), a pump cover (2) fixedly mounted on the pump housing (1), an impeller (3) rotatably arranged in a cavity (11) of the pump housing (1), a piston cavity (21) provided in the pump cover (2), a piston ring (22) provided in the piston cavity (21), and the piston ring (22) rotating synchronously with the impeller (3); a sliding pin (23) and a return spring (24) fixedly arranged in the piston cavity (21), a groove (221) provided on one end surface of the piston ring (22), a connection between the groove (221) and the end surface of the piston ring (22) being an inclined surface (222) for the sliding pin (23) to slide through, and the piston A return spring (24) is provided at the other end of the ring (22) to push it to axially contact the sliding pin (23). The cavity (11) of the pump housing (1) is connected to the water source through the piston cavity (21). During the rotation of the piston ring (22), the sliding pin (23) slides on one end surface of the piston ring (22). When the sliding pin (23) slides from the inclined surface (222) through the groove (221), the piston ring (22) cooperates with the return spring (24) to control the axial reciprocating sliding of the piston ring (22) in the piston cavity (21) to pump water from the water source into the cavity (11) of the pump housing (1) for automatic exhaust. A reversing channel (25), a cleaning and pressurizing channel (26) and a diverter chamber (27) are provided in the pump cover (2); an elastic reversing valve (4) is provided in the reversing channel (25); the outlet of the pump housing (1) is communicated with the reversing channel (25) through a first connecting pipe; a cleaning connection port (28) and a pressurizing connection port (29) are provided on the pump cover (2); one end of the diverter chamber (27) is communicated with the outlet of the cleaning and pressurizing channel (26); the other end of the diverter chamber (27) is connected to the cleaning connection port (28) and the pressurizing connection port (29); a mounting pipe (5) is provided at the inlet of the pump housing (1); and a cleaning connection port (28) and a pressurizing connection port (29) are provided. The interface (28) is communicated with the mounting pipe (5) through the second connecting pipe, and the pressurized connection port (29) is communicated with the inlet of the pump housing (1) through the third connecting pipe; a rotating frame (6) is provided on the pump housing (1), and a plurality of filter screens (61) are installed on the rotating frame (6), one of the filter screens (61) is located in the inlet of the pump housing (1), and the other filter screens (61) are located in the mounting pipe (5); by rotating the rotating frame (6), one of the filter screens (61) in the mounting pipe (5) is rotated to the inlet of the pump housing (1), and at the same time, the filter screens (61) in the inlet of the pump housing (1) are rotated to the mounting pipe (5); In a natural state, the elastic reversing valve (4) controls the piston chamber (21) to communicate with the cavity (11) of the pump housing (1) through the reversing channel (25), and the piston chamber (21) is not communicated with the cleaning and pressurizing channel (26). When the outlet of the pump housing (1) is normally drained, the outlet water pressure increases to drive the elastic reversing valve (4) to move, so that the piston chamber (21) is communicated with the cleaning and pressurizing channel (26), and the piston chamber (21) is not communicated with the cavity (11) of the pump housing (1). Water flows from the piston chamber (21) through the reversing channel (25) and the cleaning and pressurizing channel (26) into the second connecting pipe and the third connecting pipe. The water flows from the second connecting pipe into the installation pipe (5) to flush the replaced filter screen (61), and the water flows from the third connecting pipe into the inlet of the pump housing (1).

2. The centrifugal pump according to claim 1, characterized in that The impeller (3) is fixedly provided with a mounting rod (31) extending into the piston cavity (21). The mounting rod (31) is parallel to the rotation axis of the impeller (3). The mounting rod (31) passes through the piston ring (22). The piston ring (22) is slidably limited on the mounting rod (31). A return spring (24) is sleeved on the mounting rod (31). One end of the return spring (24) contacts the impeller (3), and the other end of the return spring (24) contacts the piston ring (22).

3. The centrifugal pump according to claim 2, characterized in that A sliding switch (7) for controlling the opening and closing of the cleaning connection port (28) and the pressurizing connection port (29) is slidably provided in the pump cover (2). Touch sliders (71) radially extending into the piston cavity (21) are fixedly provided at opposite ends of the sliding switch (7) along its sliding direction. When the mounting rod (31) rotates in the piston cavity (21) along with the impeller (3), the mounting rod (31) alternately pushes the two touch sliders (71) to move radially, driving the sliding switch (7) to slide back and forth, thereby controlling the opening and closing of the cleaning connection port (28) and the pressurizing connection port (29).

4. The centrifugal pump according to any one of claims 1 to 3, characterized in that The mounting tube (5) is fixedly arranged on the side of the pump housing (1) inlet, the axis of the mounting tube (5) is parallel to the axis of the pump housing (1) inlet, the rotating shaft of the rotating frame (6) is located between the mounting tube (5) and the pump housing (1) inlet, and a rotating handle (62) extending out of the pump housing (1) is fixedly arranged on the rotating frame (6).

5. The centrifugal pump according to any one of claims 1 to 3, characterized in that The elastic reversing valve (4) comprises a reversing spring (42) and a reversing valve stem (41). The reversing valve stem (41) is provided with a first reversing groove (411) and a second reversing groove (412) spaced apart in an axial direction. The outlet of the piston chamber (21) is located between the cleaning and pressurizing channel (26) and the cavity (11) of the pump housing (1). The first reversing groove (411) is used to connect the piston chamber (21) with the cleaning and pressurizing channel (26), and the second reversing groove (412) is used to connect the piston chamber (21) with the cavity (11) of the pump housing (1). One end of the reversing spring (42) contacts one end of the reversing valve stem (41), and the other end of the reversing spring (42) contacts the end wall of the reversing channel (25). The other end of the reversing channel (25) is provided with an opening connected to the outlet of the pump housing (1).

6. The centrifugal pump according to any one of claims 1 to 3, characterized in that One-way valves are provided at the inlet and outlet of the piston chamber (21).

7. The centrifugal pump according to any one of claims 1 to 3, characterized in that A first connection port (12) is provided on a side wall of the pump housing (1) near the inlet. The first connection port (12) is connected to a pressurized connection port (29) on the pump cover (2) through a third connection pipe. Water flows through the first connection port (12) into the inlet of the pump housing (1) and then into the cavity (11) of the pump housing (1) through the filter screen (61).

8. The centrifugal pump according to any one of claims 1 to 3, characterized in that: A second connecting port (13) is provided on a side wall of the pump housing (1) close to the outlet. The second connecting port (13) is communicated with a reversing channel (25) in the pump cover (2) through a first connecting pipe.

9. The centrifugal pump according to any one of claims 1 to 3, characterized in that: The piston cavity (21) is an annular cavity (11). A pump shaft (32) is rotatably provided on the pump cover (2). The pump shaft (32) is connected to the impeller (3). The rotation axis of the pump shaft (32) coincides with that of the piston ring (22).

10. The centrifugal pump according to claim 1, wherein The inner end of the pump cover (2) is provided with a disassembly opening for disassembling and assembling the piston ring (22).

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