A centrifugal pump structure with a self-priming valve

Abstract

The present invention discloses a centrifugal pump structure with a self-priming valve, which aims to solve the problem that the outlet direction of the water flow during the operation of the centrifugal pump self-priming valve is set irrationally, thereby affecting the performance of the water pump. The invention includes a pump body, wherein a water inlet chamber and an impeller chamber are provided in the pump body, an impeller is installed in the impeller chamber, and the impeller is provided with a water inlet connected to the water inlet chamber. A reflux chamber is provided in the pump body, and a reflux channel is provided between the reflux chamber and the water inlet chamber. An integrated self-priming valve assembly is installed at the reflux channel, and the outlet of the reflux channel is set biased towards the water inlet. The self-priming valve on the centrifugal pump of the present application forms an integrated module, which is convenient for assembly with the centrifugal pump and can be adapted to different models of water pumps; the outlet of the self-priming valve is biased towards the water inlet direction of the impeller, thereby avoiding the obstruction of the water flow of the centrifugal pump by self-priming reflux, thereby ensuring the performance of the water pump.

Description

Technical Field

[0001] The present invention relates to a centrifugal pump, and more particularly to a centrifugal pump structure with a self-priming valve. Background Art

[0002] As a common type of water pump, self-priming centrifugal pumps are very common and widely used in daily life and industrial production. They use centrifugal force to throw water outward from the edge of the impeller, creating a negative pressure at the center of the impeller. Under the action of atmospheric pressure or water pressure, water is sucked into the center of the impeller and then thrown out, repeating this cycle to achieve continuous pumping. Currently, common centrifugal pumps achieve self-priming through a self-priming valve. The self-priming valve itself affects the performance of the water pump during the self-priming process. The outlet direction of the water flow during the operation of the existing centrifugal pump self-priming valve is not set properly, thus affecting the performance of the water pump. Moreover, the self-priming valve is formed by assembling individual components onto the centrifugal pump, which affects the assembly efficiency of the entire centrifugal pump and cannot be modularized. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a centrifugal pump structure with a self-priming valve. The self-priming valve on the centrifugal pump forms an integrated module, which is convenient for assembly with the centrifugal pump and can be adapted to water pumps of different models; the outlet of the self-priming valve is biased toward the water inlet of the impeller, avoiding self-priming backflow from obstructing the water flow of the centrifugal pump, thereby ensuring the performance of the water pump.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a centrifugal pump structure with a self-priming valve, comprising a pump body, a water inlet chamber and an impeller chamber provided in the pump body, an impeller installed in the impeller chamber, a water inlet connected to the water inlet chamber provided on the impeller, a reflux chamber provided in the pump body, a reflux channel provided between the reflux chamber and the water inlet chamber, an integrated self-priming valve assembly installed at the reflux channel position, and the outlet of the reflux channel set biased towards the water inlet.

[0005] The self-priming valve assembly is integrated, making it easy to assemble with a centrifugal pump and adaptable to different types of water pumps. The outlet of the reflux channel is set towards the water inlet, which does not hinder the normal flow of water in the water inlet chamber and reduces the loss of water pressure caused by the reflux water. When the centrifugal pump is working, the impeller rotates, throwing water out from the periphery of the impeller and discharging it from the pump body. Water flows in from the water inlet to replenish it. The reflux chamber is connected to the water discharge side of the pump body, forming a backflow. The internal circulation of water in the water pump can increase the water head height of the pump. After the self-priming valve completes self-priming, the valve is closed to reduce flow leakage, increase flow, and thus ensure the performance of the water pump.

[0006] The self-priming valve on the centrifugal pump of the present application forms an integrated module, which is convenient for assembly with the centrifugal pump and can be adapted to different models of water pumps; the outlet of the self-priming valve is biased toward the water inlet of the impeller, avoiding self-priming backflow from obstructing the water flow of the centrifugal pump, thereby ensuring the performance of the water pump.

[0007] Preferably, the self-priming valve assembly and the reflux channel are arranged horizontally. The self-priming valve assembly includes a valve seat, a valve core, and a positioning spring. A step surface is provided on the inner wall of the reflux channel. A sealing ring for abutting and sealing on the step surface is installed on the valve core. The positioning spring is installed between one end of the valve core and the reflux channel, and the other end of the valve core can be axially moved and installed on the valve seat.

[0008] The positioning spring provides a certain preload force to the valve core, so that a certain gap is maintained between the sealing ring and the step surface, and the return channel is open. As the return pressure increases, the positioning spring is compressed, the valve core is pushed, the gap between the sealing ring and the step surface decreases, and the return flow decreases until the sealing ring and the step surface are tightly sealed and the return channel is blocked. This structure in which the self-priming valve assembly and the return channel are both arranged horizontally forms an axial return structure, which can reduce the loss of water pressure caused by the self-priming valve itself. When the self-priming valve assembly is installed on the pump body, the valve seat, valve core, and positioning spring are assembled into an integrated overall structure. After connecting the valve seat to the pump body, the entire self-priming valve assembly can be installed, which is convenient to install.

[0009] Preferably, a connecting sleeve is provided on the valve seat, the connecting sleeve is connected to the reflux channel, a flow window is provided on the connecting sleeve, and inlets are provided on the reflux channel corresponding to the flow window.

[0010] The connection sleeve is provided to facilitate the connection with the return channel. The flow window and the inlet are provided correspondingly to facilitate the flow of return water.

[0011] Preferably, the valve core has a hollow structure, with one end of the valve core close to the step surface closed and the other end of the valve core open; a protrusion is provided on the valve core, a positioning sleeve is provided on the valve seat, and a plurality of liquid grooves are provided on the side wall of the positioning sleeve. A buffer gasket is mounted on the valve core, and the buffer gasket is placed between the protrusion and the end face of the positioning sleeve, and a gap is provided between the end of the valve core and the bottom surface of the positioning sleeve.

[0012] The valve core is hollow, with one end open and the other closed, ensuring a more stable and reliable pressure applied by the return water. A buffer washer is placed between the protrusion and the locating sleeve, ensuring a gap between the end of the valve core and the bottom of the locating sleeve while also providing a buffering and protective effect for the protrusion and the end surface of the locating sleeve.

[0013] Preferably, the outlet is arranged on the side wall at the end of the return channel, and the corresponding position of the outlet in the water inlet chamber is sunken to form an outlet area, one side of the outlet area faces the water inlet on the impeller, and a water-retaining side wall is arranged on the other side of the outlet area in the water inlet chamber.

[0014] The return water flowing out of the outlet is buffered in the outlet area to avoid direct collision with the water flow in the water inlet channel of the water inlet chamber and thus hinder the flow of the water in the water inlet channel of the water inlet chamber, which is beneficial to reduce pressure loss. One side of the outlet area faces the water inlet on the impeller, so that the water in the outlet area flows directly into the water inlet.

[0015] Preferably, the self-priming valve assembly and the reflux channel are arranged vertically, the outlet is provided on the side wall of the upper end of the reflux channel, and the front of the outlet faces the water inlet on the impeller.

[0016] The self-priming valve assembly and the return channel are arranged vertically to form a radial return flow structure. The front of the outlet faces the water inlet on the impeller. The return water flows directly toward the water inlet on the impeller. The flow direction is consistent with the flow direction of the water in the water inlet chamber, and the water pressure loss is small.

[0017] The second option is that the self-priming valve assembly includes a valve seat, a positioning seat, a valve core, and a pre-tightening spring. The valve seat is provided with a water inlet channel, which constitutes a part of the water inlet chamber. The reflux channel is arranged on the valve seat, and the positioning seat is installed in the pump body. The pre-tightening spring abuts between the valve seat and one end of the valve core, and the other end of the valve core abuts on the positioning seat. A sealing surface is provided on the reflux channel, and a sealing ring is installed on the valve core. The sealing ring can abut against the sealing surface to cut off the reflux channel.

[0018] The backflow pressure within the reflux chamber acts on the valve core, pushing it toward the sealing surface. As the water pressure increases, the distance between the sealing ring and the sealing surface decreases until the sealing ring abuts the sealing surface, shutting off the backflow path. The valve core is supported between the preload spring and the positioning seat, ensuring stability and reliability. The water inlet channel provided on the valve seat serves as part of the water inlet chamber. During installation, align one end of the water inlet channel with the water inlet port on the impeller and the other end with the water discharge port on the pump body. The entire self-priming valve assembly is integrated, facilitating easy assembly and connection with the pump body.

[0019] Preferably, an extension sleeve is provided on the pump body, the positioning seat sealing sleeve is sleeved in the extension sleeve, and the positioning seat can move axially along the extension sleeve; the outer end of the extension sleeve is connected to a connecting cover, the positioning seat is supported on the connecting cover, the positioning seat is provided with an outwardly extending adjustment handle, the adjusting handle is provided with a positioning groove, the connecting cover is provided with a slot adapted to the adjusting handle, and the adjusting handle passes through the slot.

[0020] When the preload force of the preload spring needs to be adjusted, the adjusting handle is pushed into the pump body to move the positioning seat axially in the extension sleeve. After pushing it into place, the adjusting handle is rotated to engage the positioning groove on the adjusting handle with the connecting cover to realize the positioning of the positioning seat.

[0021] The third solution is that the self-priming valve assembly includes a valve seat, a valve core, and a pre-tightening spring. The valve seat is provided with a water inlet channel, which constitutes a part of the water inlet chamber. The reflux channel is provided on the valve seat. The pre-tightening spring is connected between the valve core and the valve seat. A sealing surface is provided on the reflux channel. A sealing ring is installed on the valve core. The sealing ring can abut against the sealing surface to cut off the reflux channel. A guide cover extending toward the water inlet chamber is provided at the end of the reflux channel, and an outlet facing the water inlet on the impeller is provided on the side wall of the guide cover.

[0022] The flow deflector ensures that the outlet faces the impeller's water inlet, and the return water flows in the same direction as the water in the inlet chamber, minimizing pressure loss. The inlet channel on the valve seat serves as part of the inlet chamber. During installation, align one end of the channel with the impeller's water inlet and connect it to the pump's suction port. The integrated layout of the entire self-priming valve assembly facilitates easy assembly and connection with the pump.

[0023] The fourth option is that the self-priming valve assembly includes a valve seat, an outer valve core, an inner valve core, an outer spring, and an inner spring. The valve seat is provided with a water inlet channel, which constitutes a part of the water inlet chamber. The return channel is arranged on the valve seat, the outer valve core is provided with a valve hole, and the inner wall of the valve hole is provided with an inner sealing surface. The inner valve core is fitted with the inner valve hole, and the inner sealing ring is connected to the inner valve core. The inner spring is installed between the valve hole and the inner valve core, and the inner sealing ring abuts against the inner sealing surface; an outer sealing surface is provided in the return channel, an outer sealing ring is connected to the outer valve core, and the outer spring is connected between the outer valve core and the return channel, and the outer sealing ring can abut against the outer sealing surface to achieve sealing; a guide cover extending toward the water inlet chamber is provided at the end of the return channel, and an outlet facing the water inlet on the impeller is provided on the side wall of the guide cover.

[0024] The deflector is positioned so that the outlet faces the impeller's water inlet, and the return water flows in the same direction as the water flow in the inlet chamber, minimizing pressure loss. The inlet channel on the valve seat serves as part of the inlet chamber. During installation, align one end of the inlet channel with the impeller's water inlet and the other end with the pump's suction port. The entire self-priming valve assembly is integrated, making it easy to connect to the pump.

[0025] At low pressure, the outer valve core opens and the inner valve core closes, allowing the centrifugal pump to operate under high flow conditions. At high pressure, the outer valve core closes and the inner valve core opens, allowing the centrifugal pump to operate under low flow conditions.

[0026] Compared with the prior art, the present invention has the following beneficial effects: (1) the self-priming valve on the centrifugal pump forms an integrated module, which is convenient for assembly with the centrifugal pump and can be adapted to different types of water pumps; the outlet of the self-priming valve is biased toward the water inlet of the impeller, avoiding the obstruction of the water flow of the centrifugal pump by self-priming backflow, thereby ensuring the performance of the water pump; (2) the centrifugal pump can operate reliably under both low and high flow conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of embodiment 1 of the present invention;

[0028] Figure 2 1 is a schematic structural diagram of a self-priming valve assembly according to embodiment 1 of the present invention;

[0029] Figure 3 is a schematic structural diagram of embodiment 2 of the present invention;

[0030] Figure 4 2 is a schematic structural diagram of a self-priming valve assembly according to embodiment 2 of the present invention;

[0031] Figure 5 is a schematic structural diagram of embodiment 3 of the present invention;

[0032] Figure 6 1 is a schematic structural diagram of a self-priming valve assembly according to embodiment 4 of the present invention;

[0033] In the figure: 1, pump body, 2, water inlet chamber, 3, impeller chamber, 4, impeller, 5, motor, 6, water inlet, 7, reflux chamber, 8, reflux channel, 9, valve seat, 10, valve core, 11, positioning spring, 12, step surface, 13, sealing ring, 14, connecting sleeve, 15, flow window, 16, flow inlet, 17, mounting hole, 18, convex ring, 19, protrusion, 20, positioning sleeve, 21, liquid groove, 22, buffer gasket, 23, outflow area, 24, water retaining side wall, 25, positioning seat, 26, preload spring, 27, Water inlet channel, 28. baffle, 29. extension sleeve, 30. connecting cover, 31. adjusting handle, 32. positioning groove, 33. slot, 34. boss, 35. ring groove, 36. flow guide cover, 37. positioning rod, 38. outer valve core, 39. inner valve core, 40. outer spring, 41. inner spring, 42. valve hole, 43. inner sealing surface, 44. inner sealing ring, 45. outer sealing surface, 46. outer sealing ring, 47. positioning end cover, 48. guide hole, 49. flange, 50. positioning ring, 51. guide hole, 52. outlet. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0035] Example 1: A centrifugal pump structure with a self-priming valve (see attached Figure 1 , Attachment Figure 2), comprising a pump body 1, which is provided with a water inlet chamber 2 and an impeller chamber 3. An impeller 4 is mounted in the impeller chamber. The pump body is connected to a motor 5, and the motor output shaft is connected to the impeller. The impeller is provided with a water inlet 6 communicating with the water inlet chamber. The pump body is provided with a reflux chamber 7, and a reflux channel 8 is provided between the reflux chamber and the water inlet chamber. An integrated self-priming valve assembly is installed in the reflux channel, and the outlet 52 of the reflux channel is arranged offset from the water inlet.

[0036] The self-priming valve assembly and the reflux channel are both arranged horizontally. The self-priming valve assembly includes a valve seat 9, a valve core 10, and a positioning spring 11. A step surface 12 is provided on the inner wall of the reflux channel. A sealing ring 13 for abutting and sealing on the step surface is installed on the valve core. The positioning spring is installed between one end of the valve core and the reflux channel, and the other end of the valve core is axially movable and installed on the valve seat. A connecting sleeve 14 is provided on the valve seat, and the connecting sleeve is connected to the reflux channel. The valve seat and the connecting sleeve can be connected in a set or made into one piece. In this embodiment, the connection is made in a set manner. A flow window 15 is provided on the connecting sleeve, and an inlet 16 is provided on the reflux channel corresponding to the flow window. Mounting holes 17 are provided on the pump body and corresponding to the valve seat, and the valve seat is tightly connected to the mounting hole. A convex ring 18 is provided on the valve core and at a position corresponding to the sealing ring, and the sealing ring is supported on the end face of the convex ring. The valve core is hollow, with one end near the stepped surface closed and the other end open. A protrusion 19 is provided on the valve core, a positioning sleeve 20 is provided on the valve seat, and several liquid-passing grooves 21 are provided on the sidewall of the positioning sleeve. A buffer washer 22 is mounted on the valve core, positioned between the protrusion and the end face of the positioning sleeve. A gap is provided between the end of the valve core and the bottom face of the positioning sleeve. A gap is provided between the outer wall of the valve core and the inner wall of the return channel. An outlet is provided on the sidewall at the end of the return channel. A corresponding position within the water inlet chamber and the outlet is sunken to form an outlet area 23. One side of the outlet area faces the water inlet on the impeller, and a water-retaining sidewall 24 is provided within the water inlet chamber on the other side of the outlet area. A flow seat is provided within the water inlet chamber, and the return channel is provided on the flow seat. A flow chamber is provided within the flow seat, forming part of the water inlet chamber. One end of the flow chamber is aligned and connected to the water inlet on the impeller, and the other end is connected to the pump body's suction port.

[0037] The self-priming valve assembly is integrated, making it easy to assemble with a centrifugal pump and adaptable to different types of water pumps. The outlet of the reflux channel is set towards the water inlet, which does not hinder the normal flow of water in the water inlet chamber and reduces the loss of water pressure caused by the reflux water. When the centrifugal pump is working, the impeller rotates, throwing water out from the periphery of the impeller and discharging it from the pump body. Water flows in from the water inlet to replenish it. The reflux chamber is connected to the water discharge side of the pump body, forming a backflow. The internal circulation of water in the water pump can increase the water head height of the pump. After the self-priming valve completes self-priming, the valve is closed to reduce flow leakage, increase flow, and thus ensure the performance of the water pump.

[0038] The horizontal arrangement of the self-priming valve assembly and the return flow channel creates an axial return flow structure, which can reduce the loss of water pressure caused by the self-priming valve itself. When the self-priming valve assembly is installed on the pump body, the valve seat, valve core, and positioning spring are assembled into an integrated structure. Once the valve seat is connected to the pump body, the entire self-priming valve assembly is installed, making installation easy.

[0039] Example 2: A centrifugal pump structure with a self-priming valve (see attached Figure 3 , Attachment Figure 4 ), its structure is similar to that of embodiment 1, the main difference being that in this embodiment, the self-priming valve assembly and the reflux channel are both arranged vertically, the outlet is provided on the side wall of the upper end of the reflux channel, and the front of the outlet faces the water inlet on the impeller.

[0040] The self-priming valve assembly includes a valve seat, a positioning seat 25, a valve core, and a preload spring 26. The valve seat is provided with an inlet channel 27, which forms part of the water inlet chamber. The reflux channel is provided on the valve seat, which is mounted within the pump body. The preload spring abuts between the valve seat and one end of the valve core, while the other end of the valve core abuts the positioning seat. The reflux channel is provided with a sealing surface, and a sealing ring is mounted on the valve core. The sealing ring abuts against the sealing surface to cut off the reflux channel. A baffle 28 is provided at the corresponding position at the upper end of the reflux channel within the valve seat, directing the reflux water flowing out of the outlet toward the water inlet on the impeller. The lower end of the reflux channel opens and communicates with the reflux chamber.

[0041] The pump body is equipped with an extension sleeve 29, into which the locating seat seal is fitted. The locating seat can move axially along the extension sleeve. A connecting cover 30 is connected to the outer end of the extension sleeve, on which the locating seat is supported. The locating seat is equipped with an outwardly extending adjustment handle 31, which has a positioning groove 32. The connecting cover has a slot 33 adapted for the adjustment handle, which extends through the slot. A boss 34 is provided within the reflux channel, with an annular groove 35 formed on the boss. The sealing surface is arranged at an angle on the inner edge of the boss, and one end of the preload spring is mounted in the annular groove. The locating seat is equipped with a guide hole 51, into which the lower portion of the valve core is movably inserted. The other structures are the same as those in Example 1.

[0042] The backflow pressure within the reflux chamber acts on the valve core, pushing it toward the sealing surface. As the water pressure increases, the distance between the sealing ring and the sealing surface decreases until the sealing ring abuts the sealing surface, shutting off the backflow path. The valve core is supported between the preload spring and the positioning seat, ensuring stability and reliability. The water inlet channel provided on the valve seat serves as part of the water inlet chamber. During installation, align one end of the water inlet channel with the water inlet port on the impeller and the other end with the water discharge port on the pump body. The entire self-priming valve assembly is integrated, facilitating easy assembly and connection with the pump body.

[0043] Example 3: A centrifugal pump structure with a self-priming valve (see attached Figure 5), its structure is similar to that of embodiment 1, the main difference being that in this embodiment, the self-priming valve assembly and the reflux channel are both arranged vertically, the outlet is provided on the side wall of the upper end of the reflux channel, and the front of the outlet faces the water inlet on the impeller.

[0044] The self-priming valve assembly includes a valve seat, a valve core, and a preload spring. The valve seat is provided with an inlet channel, which forms part of the water inlet chamber. A return channel is provided on the valve seat, forming a T-shaped structure. The preload spring is connected between the valve core and the valve seat. A sealing surface is provided on the return channel, and a sealing ring is mounted on the valve core. The sealing ring abuts against the sealing surface to cut off the return channel. A flow deflector 36 extending toward the water inlet chamber is provided at the end of the return channel. The sidewall of the flow deflector is provided with an outlet facing the impeller's upper water inlet. The flow deflector is an outwardly convex arc structure, along the direction of water flow.

[0045] A boss is provided within the reflux channel, with an annular groove formed on the boss. A sealing surface is positioned at the inner edge of the boss, with the sealing surface inclined. One end of the preload spring is mounted in the annular groove. One end of the reflux channel is connected to a positioning rod 37, against which the valve core abuts for positioning. The remaining structure is identical to that of Example 1.

[0046] The flow deflector ensures that the outlet faces the impeller's water inlet, and the return water flows in the same direction as the water in the inlet chamber, minimizing pressure loss. The inlet channel on the valve seat serves as part of the inlet chamber. During installation, align one end of the channel with the impeller's water inlet and connect it to the pump's suction port. The integrated layout of the entire self-priming valve assembly facilitates easy assembly and connection with the pump.

[0047] Example 4: A centrifugal pump structure with a self-priming valve (see attached Figure 6 ), its structure is similar to that of embodiment 1, the main difference being that in this embodiment, the self-priming valve assembly and the reflux channel are both arranged vertically, the outlet is provided on the side wall of the upper end of the reflux channel, and the front of the outlet faces the water inlet on the impeller.

[0048] The self-priming valve assembly includes a valve seat, an outer valve core 38, an inner valve core 39, an outer spring 40, and an inner spring 41. The valve seat is provided with an inlet channel, which forms part of the water inlet chamber. The return channel is provided on the valve seat, and the valve seat as a whole has a T-shaped structure. The outer valve core is provided with a valve hole 42, and an inner sealing surface 43 is provided on the inner wall of the valve hole. The inner valve core is fitted with the inner valve hole, and an inner sealing ring 44 is connected to the inner valve core. The inner spring is installed between the valve hole and the inner valve core, and the inner sealing ring abuts the inner sealing surface. An outer sealing surface 45 is provided in the return channel, and an outer sealing ring 46 is connected to the outer valve core. The outer spring is connected between the outer valve core and the return channel, and the outer sealing ring can abut the outer sealing surface to achieve sealing. A flow deflector is provided at the end of the return channel, extending toward the water inlet chamber, and an outlet facing the water inlet on the impeller is provided on the side wall of the flow deflector. The flow deflector has an outwardly convex arc structure along the flow direction of the water passing through the inlet.

[0049] One end of the valve aperture is connected to a positioning end cap 47, which is fastened to the outer valve core. A guide hole 48 is provided in the positioning end cap, and the inner valve stem is adapted to fit within the guide hole. Both the outer and inner valve cores have an inverted T-shaped structure, with the outer sealing surface positioned at an angle. The outer sealing ring fits over the outer wall of the larger diameter portion of the outer valve core. A flange 49 is provided at the lower end of the valve aperture, with the inner sealing surface positioned on the flange. The inner sealing ring fits over the outer wall of the larger diameter portion of the inner valve core. A downwardly extending positioning ring 50 is provided within the reflux channel, with the upper end of the outer spring fitting over the positioning ring. A positioning rod is connected to the lower end of the reflux channel, and the valve core abuts against the positioning rod to achieve positioning. The remaining structure is identical to that of Example 1.

[0050] At low pressure, the outer valve core opens and the inner valve core closes, allowing the centrifugal pump to operate under high flow conditions. At high pressure, the outer valve core closes and the inner valve core opens, allowing the centrifugal pump to operate under low flow conditions.

[0051] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A centrifugal pump structure with a self-priming valve, comprising a pump body, a water inlet chamber, an impeller chamber, an impeller mounted in the impeller chamber, and a water inlet connected to the water inlet chamber on the impeller, characterized in that: A reflux chamber is provided in the pump body, a reflux channel is provided between the reflux chamber and the water inlet chamber, an integrated self-priming valve assembly is installed at the reflux channel, and the outlet of the reflux channel is set toward the water inlet; the self-priming valve assembly and the reflux channel are arranged horizontally, the self-priming valve assembly includes a valve seat, a valve core, a positioning spring, and a step surface is provided on the inner wall of the reflux channel; the valve core is a hollow structure, the end of the valve core close to the step surface is closed, and the other end of the valve core is open, a protrusion is provided on the valve core, a positioning sleeve is provided on the valve seat, and a number of liquid grooves are provided on the side wall of the positioning sleeve, a buffer gasket is installed on the valve core, the buffer gasket is placed between the protrusion and the end face of the positioning sleeve, and a gap is provided between the end of the valve core and the bottom surface of the positioning sleeve.

2. A centrifugal pump structure with a self-priming valve according to claim 1, characterized in that: A sealing ring for abutting and sealing on the step surface is installed on the valve core, a positioning spring is installed between one end of the valve core and the return channel, and the other end of the valve core is axially movable and installed on the valve seat.

3. A centrifugal pump structure with a self-priming valve according to claim 2, characterized in that: A connecting sleeve is provided on the valve seat, the connecting sleeve is connected to the reflux channel, a flow window is provided on the connecting sleeve, and an inlet is provided on the reflux channel corresponding to the flow window.

4. A centrifugal pump structure with a self-priming valve according to claim 2 or 3, characterized in that: The outlet is arranged on the side wall at the end of the return channel, and the corresponding position in the water inlet cavity and the outlet is sunken to form an outlet area, one side of the outlet area faces the water inlet on the impeller, and a water retaining side wall is arranged on the other side of the outlet area in the water inlet cavity.

5. A centrifugal pump structure with a self-priming valve, comprising a pump body, a water inlet chamber and an impeller chamber provided in the pump body, an impeller installed in the impeller chamber, and a water inlet connected to the water inlet chamber provided on the impeller, characterized in that: A reflux chamber is provided in the pump body, a reflux channel is provided between the reflux chamber and the water inlet chamber, an integrated self-priming valve assembly is installed at the reflux channel position, and the outlet of the reflux channel is set biased towards the water inlet; the self-priming valve assembly and the reflux channel are arranged vertically, the self-priming valve assembly includes a valve seat, a positioning seat, a valve core, and a pre-tightening spring, a water inlet channel is provided on the valve seat, the water inlet channel constitutes a part of the water inlet chamber, the reflux channel is arranged on the valve seat, the positioning seat is installed in the pump body, the pre-tightening spring abuts between the valve seat and one end of the valve core, and the other end of the valve core abuts on the positioning seat; an extension sleeve is provided on the pump body, the positioning seat sealing sleeve is set in the extension sleeve, and the positioning seat can move axially along the extension sleeve.

6. A centrifugal pump structure with a self-priming valve according to claim 5, characterized in that: The outlet is arranged on the side wall of the upper end of the return channel, and the front of the outlet faces the water inlet on the impeller.

7. A centrifugal pump structure with a self-priming valve according to claim 6, characterized in that: A sealing surface is provided on the reflux channel, and a sealing ring is installed on the valve core. The sealing ring can abut against the sealing surface to cut off the reflux channel.

8. A centrifugal pump structure with a self-priming valve according to claim 7, characterized in that: The outer end of the extension sleeve is connected to a connecting cover, the positioning seat is supported on the connecting cover, the positioning seat is provided with an adjusting handle extending outward, the adjusting handle is provided with a positioning groove, the connecting cover is provided with a slot adapted to the adjusting handle, and the adjusting handle passes through the slot.

9. A centrifugal pump structure with a self-priming valve, comprising a pump body, a water inlet chamber and an impeller chamber provided in the pump body, an impeller installed in the impeller chamber, and a water inlet connected to the water inlet chamber provided on the impeller, characterized in that: A reflux chamber is provided in the pump body, a reflux channel is provided between the reflux chamber and the water inlet chamber, an integrated self-priming valve assembly is installed at the reflux channel position, and the outlet of the reflux channel is set biased towards the water inlet; the self-priming valve assembly includes a valve seat, a valve core, and a pre-tightening spring. The valve seat is provided with a water inlet channel, and the water inlet channel constitutes a part of the water inlet chamber. The reflux channel is arranged on the valve seat, and the pre-tightening spring is connected between the valve core and the valve seat. A sealing surface is provided on the reflux channel, and a sealing ring is installed on the valve core. The sealing ring can abut against the sealing surface to cut off the reflux channel. A boss is provided in the reflux channel, and an annular groove is provided on the boss. The sealing surface is provided on the inner edge of the boss, and the sealing surface is inclined. One end of the pre-tightening spring is installed in the annular groove.

10. A centrifugal pump structure with a self-priming valve according to claim 9, characterized in that: A flow guide shroud extending toward the water inlet cavity is provided at the end of the return channel, and an outlet facing the water inlet on the impeller is provided on the side wall of the flow guide shroud.

11. A centrifugal pump structure with a self-priming valve, comprising a pump body, a water inlet chamber and an impeller chamber provided in the pump body, an impeller installed in the impeller chamber, and a water inlet connected to the water inlet chamber provided on the impeller, characterized in that: A reflux chamber is provided in the pump body, a reflux channel is provided between the reflux chamber and the water inlet chamber, an integrated self-priming valve assembly is installed at the reflux channel position, and the outlet of the reflux channel is set biased towards the water inlet; the self-priming valve assembly includes a valve seat, an outer valve core, an inner valve core, an outer spring, and an inner spring. A water inlet channel is provided on the valve seat, and the water inlet channel constitutes a part of the water inlet chamber. The reflux channel is set on the valve seat, and a valve hole is provided on the outer valve core. The inner valve core and the inner valve hole are fitted together, and the inner spring is installed between the valve hole and the inner valve core. The outer spring is connected between the outer valve core and the reflux channel, and one end of the valve hole is connected to the positioning end cover, and the positioning end cover is buckled with the outer valve core. The lower end of the reflux channel is connected to the positioning rod, and the valve core abuts on the positioning rod.

12. A centrifugal pump structure with a self-priming valve according to claim 11, characterized in that: An inner sealing surface is provided on the inner wall of the valve hole, an inner sealing ring is connected to the inner valve core, and the inner sealing ring abuts against the inner sealing surface; an outer sealing surface is provided in the return channel, an outer sealing ring is connected to the outer valve core, and the outer sealing ring can abut against the outer sealing surface to achieve sealing; a guide cover extending toward the water inlet chamber is provided at the end of the return channel, and an outlet facing the water inlet on the impeller is provided on the side wall of the guide cover.

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