A duct type mute intelligent booster water pump

Abstract

The application discloses a pipeline type mute intelligent booster water pump, which is provided with a water inlet and a water outlet pipe arranged at two ends of a pipeline type sleeve, a impeller assembly arranged in the pipeline type sleeve and facing the water inlet, a water pump motor arranged in the pipeline type sleeve and used for driving the impeller assembly to rotate, and a rotor cavity of the water pump motor communicated with a water outlet of the impeller assembly. The rotor cavity of the water pump motor is internally provided with a ceramic rotating shaft used as a rotating shaft of the water pump motor, a ceramic bearing supporting the ceramic rotating shaft, and a rotor assembly sleeved on the ceramic rotating shaft.

Description

Technical Field

[0001] This invention relates to a booster pump, and more particularly to a pipe-type silent intelligent booster pump for household pipeline pressurization. Background Technology

[0002] With the development of modern society, more and more families are using household variable frequency booster water pumps.

[0003] Current household variable frequency booster pumps have the following characteristics: The motor and pump require a mechanical seal to isolate the motor from water ingress. The motor needs ball bearings for support, generating rolling friction noise and wear on the balls during rotation. High-speed rotating impellers throw water out, impacting the pump body wall and causing noise from cavitation and rupture. Without shielding these sounds, the user experience will be negatively affected. Traditional induction motors have relatively low power density and efficiency, resulting in a larger volume than permanent magnet motors for the same power output, consuming significant amounts of steel, copper, and aluminum. The separate design of the inverter, induction motor, pump, and cooling fan contributes to the overall bulky size. Most traditional self-priming electric pumps are vortex pumps. The spur-tooth copper impeller in a vortex pump has a very small clearance with the pump body, leading to severe friction noise between the impeller and the pump body at high pressures.

[0004] Existing household variable frequency booster pumps have the following technical problems: 1. Water vapor isolation between the motor and pump requires a friction-sealed mechanical seal, which results in mechanical seal friction loss and reduces overall efficiency. This structure is complex, and the mechanical seal is a consumable component, prone to failure and leakage, requiring regular replacement. 2. Most traditional self-priming electric pumps are vortex pumps, which generate significant noise at high water pressure. 3. Induction motors have low power density and efficiency, are large in size, and waste materials. 4. Traditional multi-stage centrifugal pumps and unshielded electric pumps generate noise due to high-speed water flow impacting the pump walls, cavitation, and rupture. 5. The ball bearings supporting the motor shaft have poor dust and water resistance; high-speed rotation causes rolling friction wear on the balls, leading to bearing noise. 6. Traditional self-priming centrifugal pumps are large in size, with the inlet at the front and the outlet at the top, making pipe installation complex. Multiple multi-directional pipe connections are required for installation, resulting in a large installation area and material waste.

[0005] Furthermore, the inlet of the impeller assembly is a negative pressure zone. After the liquid is accelerated by the impeller, it becomes pressurized, making the rear end of the impeller assembly a high-pressure zone. When the water pump is working, the impeller is located between the high and low pressure zones. Under the action of the pressure difference, it generates an axial thrust from the high-pressure zone to the negative pressure zone. This axial thrust drives the water pump shaft to move axially, thereby shortening the service life of the water pump shaft. Summary of the Invention

[0006] The purpose of this invention is to provide a pipeline-type silent intelligent booster water pump, which is mainly used to solve the technical problem of axial movement of the pump motor shaft driven by axial thrust.

[0007] The present invention provides a pipeline-type silent intelligent booster water pump comprising:

[0008] The inlet and outlet pipes are installed at both ends of the pipe sleeve;

[0009] An impeller assembly installed inside a pipe sleeve and facing the water inlet;

[0010] A water pump motor is installed inside the pipe sleeve to drive the impeller assembly to rotate.

[0011] The rotor cavity of the water pump motor, which is connected to the outlet of the impeller assembly, contains:

[0012] Ceramic shaft used as a water pump motor shaft;

[0013] A ceramic bearing supporting the ceramic shaft, the ceramic bearing being a thrust bearing used to prevent axial movement of the ceramic shaft under axial thrust; and

[0014] Rotor assembly mounted on the ceramic shaft.

[0015] Preferably, the ceramic bearing includes a front ceramic bearing and a rear ceramic bearing, and a front bearing bracket for supporting the front ceramic bearing is installed between the front ceramic bearing and the front cover of the water pump motor.

[0016] Preferably, the front-end ceramic bearing includes a ceramic sliding bearing that supports the ceramic shaft, a limiting member fixedly mounted on the ceramic shaft, and a limiting sliding assembly mounted between the ceramic sliding bearing and the limiting member.

[0017] Preferably, one end of the limiting sliding assembly is fixedly connected to the limiting member, and the other end is in sliding contact with the ceramic sliding bearing; the outer side of the ceramic sliding bearing is fixedly connected to the annular end of the front bearing bracket.

[0018] Preferably, the diameter of the front ceramic sliding bearing is larger than that of the rear ceramic bearing, and the outer diameter of the limiting sliding assembly is comparable to that of the ceramic sliding bearing, so as to increase the sliding contact area between the limiting sliding assembly and the ceramic sliding bearing.

[0019] Preferably, the end of the front bearing bracket that connects to the ceramic sliding bearing includes an annular end for fitting the ceramic sliding bearing and a connecting end for connecting the end of the ceramic sliding bearing facing the impeller, thereby increasing the ceramic sliding bearing's ability to withstand axial thrust.

[0020] Preferably, the limiting component is a limiting copper sleeve, and the end of the limiting copper sleeve facing the limiting sliding component has a positioning groove; the limiting copper sleeve is interference-fitted with the ceramic rotating shaft and is installed on the ceramic rotating shaft by cold pressing assembly.

[0021] Preferably, the limiting sliding assembly consists of a silicon carbide ring and a metal shell for fixing the silicon carbide ring; the metal shell has a positioning key that is inserted into a positioning groove, and the positioning key is installed in a position close to the limiting copper sleeve through the positioning groove, so that the limiting sliding assembly can rotate synchronously with the ceramic rotating shaft through the positioning key inserted into the positioning groove.

[0022] The present invention also includes a pipeline-type silent intelligent booster water pump:

[0023] An inverter assembly for providing variable frequency power to the water pump motor, which is installed inside the pipe sleeve;

[0024] A one-way valve assembly installed in the outlet pipe has an automatic pump shutdown control device for stopping the inverter assembly from supplying power to the pump motor when the one-way valve assembly performs a closing operation.

[0025] Preferably, the one-way valve assembly includes: a one-way valve seat mounted on the outlet pipe; a plunger seal mounted on the one-way valve seat; and a one-way valve plunger for moving and contacting the plunger seal when the one-way valve assembly performs a closing operation, and moving away from the plunger seal when the one-way valve assembly performs an opening operation.

[0026] Preferably, the automatic pump shutdown control device includes: a magnetic induction switch installed on the outside of the water pipe; and a magnet installed on the one-way valve plunger, used to approach the magnetic induction switch when the one-way valve assembly performs a closing operation, thereby cutting off the power supply circuit of the magnetic induction switch by magnetic force.

[0027] Preferably, the pipeline-type silent intelligent booster water pump of the present invention further includes a shielding sleeve installed between the rotor cavity and the stator cavity of the water pump motor to prevent water from entering the stator cavity; the shielding sleeve is made of a non-magnetic heat dissipation material.

[0028] Preferably, the shielding sleeve is composed of a stator shielding sleeve for forming a stator cavity and a rotor shielding sleeve, and there is a gap between the stator shielding sleeve and the rotor shielding sleeve for forming a water flow channel in the rotor cavity, which is used to carry away the heat generated by the stator and realize heat dissipation of the stator.

[0029] Preferably, a front bearing bracket for supporting the front ceramic bearing is installed between the front ceramic bearing and the front cover of the water pump motor. The front bearing bracket has an inlet hole and an outlet hole for the water flow channel of the rotor cavity.

[0030] Preferably, the front ceramic bearing and the rear ceramic bearing have gaps between themselves and the ceramic shaft to allow a small amount of water to flow through the rotor cavity. This gap is used to form a water film between the front ceramic bearing and the ceramic shaft and between the rear ceramic bearing and the ceramic shaft when the shaft rotates at high speed, thereby reducing bearing noise.

[0031] Preferably, the impeller shaft is a stainless steel shaft that is fitted onto the ceramic shaft by a hot pressing process.

[0032] Preferably, the impeller assembly includes at least one impeller unit, each impeller unit consisting of an impeller and a guide plate, the impeller being movably sleeved on the impeller shaft, and the guide plate being fixedly connected to the pipe sleeve.

[0033] The main technical effects of this invention are: 1) using thrust bearings to prevent axial movement of the pump shaft, especially the ceramic pump shaft; 2) by using a one-way valve to close the plunger and reset the magnet, the magnetic element can sense the magnet reset outside the outlet pipe, thus controlling the automatic shutdown of the electric pump; 3) using non-magnetic stainless steel material for shielding and isolation of the motor rotor and stator, the magnetic field generated by the stator can pass through the stainless steel material and act on the permanent magnet rotor, thus achieving water vapor isolation without mechanical sealant.

[0034] The present invention will now be described in detail with reference to the accompanying drawings. Attached Figure Description

[0035] Figure 1 This is an external view of the pipeline-type silent intelligent booster water pump of the present invention;

[0036] Figure 2 yes Figure 1 The image shows a front view of the outlet side of a pipeline-type silent intelligent booster water pump.

[0037] Figure 3 yes Figure 2 AA section view;

[0038] Figure 4 yes Figure 2 BB section view;

[0039] Figure 5 yes Figure 3 Enlarged view of section C;

[0040] Figure 6 yes Figure 4 Enlarged view of section E in the middle;

[0041] Figure 7 This is an exploded view of an impeller unit of the impeller assembly of the present invention;

[0042] Figure 8This is a schematic diagram of another embodiment of the thrust bearing of the present invention;

[0043] Figure 9 yes Figure 8 Enlarged view of section B;

[0044] Figure 10 yes Figure 8 BB section view.

[0045] Explanation of reference numerals in the attached drawings: Pipe sleeve 100, pump front cover 101, screw 102, lead pipe 103, pump rear cover 104, water inlet 105, cylindrical pin 106, T-pin 107, countersunk screw 108, screw 109; Motor bracket 200, motor front cover 201, motor housing 202, stator cavity 203, stator core 2031, motor rear cover 204, rear ceramic bearing 205, ceramic sliding bearing 2051, limiting sliding assembly 2052, ceramic shaft 206, shaft cavity 2061, shaft water inlet 2062, rotor cavity 207, rotor magnet 2071, rotor core 2072, rotor ball end cover 2073, thrust bearing or front ceramic bearing 208, ceramic sliding bearing 2081, limiting sliding assembly 2 082, silicon carbide ring 20820, stainless steel shell 20821, stainless steel positioning key 20822, limit component 2083, limit copper sleeve 20830, limit copper sleeve positioning groove 20831, shielding sleeve assembly 209, stator shielding sleeve 2091, rotor shielding sleeve 2092, front bearing bracket 210, front bearing bracket end 211; guide plate 300, impeller 301, stainless steel shaft 302, hub 303, stainless steel cover plate 304; water outlet pipe 400, one-way valve assembly 401, magnetic induction element 402, pressure sensor 403, venting nail 404, magnetic block 405, return spring 406, one-way valve bracket 407, one-way valve seat 408, plunger seal 409, one-way valve sealing ring 410; inverter 500. Detailed Implementation

[0046] This invention is a kind of Figure 1 The pipeline-type silent intelligent booster water pump shown includes Figure 2The diagram shows an inlet 105 and an outlet pipe 400 located at both ends of a pipe sleeve 100; an impeller assembly located inside the pipe sleeve 100 and facing the inlet 105; a water pump motor located inside the pipe sleeve 100 for driving the impeller assembly to rotate; and a rotor cavity 207 of the water pump motor communicating with the outlet of the impeller assembly. The rotor cavity 207 of the water pump motor contains: a ceramic shaft 206 serving as the water pump motor shaft; ceramic bearings 205 and 208 supporting the ceramic shaft 207, the ceramic bearings being thrust bearings used to prevent axial movement of the ceramic shaft under axial thrust; and a rotor assembly including rotor magnets 2071 and a rotor core 2072 mounted on the ceramic shaft 206.

[0047] The 206 ceramic shaft and ceramic bearings are resistant to deformation at high temperatures and have low frictional loss, which not only increases the lifespan of the water pump but also improves its efficiency. The thrust bearing prevents the ceramic shaft from moving axially under axial thrust, thus avoiding damage and extending its service life.

[0048] The pipeline-type silent intelligent booster water pump also includes: an inverter assembly 500 installed in the pipeline sleeve 100 for providing frequency conversion power to the water pump motor; and a one-way valve assembly installed in the outlet pipe 400, the one-way valve assembly having an automatic water pump stop control device, which is used to stop the inverter assembly 500 from supplying power to the water pump motor when the one-way valve assembly performs a closing operation, thereby realizing the function of automatically stopping the water pump when the water pressure in the outlet pipe is higher than a predetermined value.

[0049] The present invention can also include a pressure sensor 403 for detecting the water pressure in the outlet pipe 400. The inverter assembly operates based on the water pressure detected by the pressure sensor 403. When the water pressure detected by the pressure sensor 403 exceeds a threshold, it stops supplying power to the water pump motor, thus automatically stopping the water pump. The present invention achieves the automatic water pump shutdown function by using both the pressure sensor 403 and the automatic water pump shutdown control device, thereby increasing the reliability of the automatic shutdown.

[0050] See Figure 5 The one-way valve assembly of the booster water pump of the present invention includes: a one-way valve seat 408 installed on the outlet pipe 400; a plunger seal 409 installed on the one-way valve seat 408; and a one-way valve plunger 401, which is used to move and contact the plunger seal 409 when the one-way valve assembly performs a closing operation, and to move away from the plunger seal 409 when the one-way valve assembly performs an opening operation.

[0051] If the water pressure at the outlet is greater than the pressure of the water pumped in by the impeller assembly, backflow will occur. This happens when the water consumption in the direction of the booster pump's outlet is less than a certain value (e.g., no user is using water). The one-way valve assembly prevents this backflow. Specifically, if the water pressure at the outlet reaches a predetermined value, the one-way valve plunger 401, under the action of the return spring 406, will contact the plunger seal 409, closing the water flow channel. One feature of this invention is the inclusion of a linked automatic pump shutdown control device in the one-way valve assembly. When the one-way valve plunger 401 moves away from the plunger seal 409, the automatic pump shutdown control device activates the pump motor; when the one-way valve plunger 401 contacts the plunger seal 409, the automatic pump shutdown control device stops the pump motor.

[0052] See Figure 5 The automatic pump shutdown control device includes: a magnetic induction switch 402 installed on the outside of the water pipe 400; and a magnet 405 installed on the one-way valve plunger 401, which is used to approach the magnetic induction switch 402 when the one-way valve assembly performs a closing operation, and cut off the power supply circuit of the magnetic induction switch 402 by magnetic force.

[0053] The performance of a water pump depends to some extent on the heat dissipation capacity of its motor. During operation, the pump motor generates a significant amount of heat. If this heat cannot be dissipated in time, it can damage the pump, such as causing the motor to burn out or high-power components of the inverter to fail. This invention addresses this by establishing a water channel from the impeller assembly to the outlet pipe 400 between the motor rear cover 204 (where the inverter assembly is installed) and the motor housing 202 (where the pump motor is installed) and the pipe sleeve 100. This channel utilizes flowing water to cool the inverter assembly and the pump motor.

[0054] The rotor cavity 207 of the water pump motor of the present invention is connected to the outlet of the impeller assembly and is equipped with a ceramic shaft 206 serving as the motor shaft, a ceramic bearing 205 supporting the ceramic shaft, and a rotor assembly fitted onto the ceramic shaft. The rotor cavity 207 contains a rotor core fitted onto the motor shaft and magnetic tiles fixed to the rotor core. See [reference needed]. Figure 6 The stator cavity 203 contains the stator core and stator coils, which are used to generate the magnetic field that drives the rotor to rotate.

[0055] This invention involves installing a shielding sleeve 209 between the rotor cavity 207 and the stator cavity 203 of a water pump motor to prevent water from entering the stator cavity 203. The shielding sleeve 209 is made of a non-magnetic heat-dissipating material such as stainless steel. On the one hand, it allows the magnetic field generated by the stator to pass through the shielding sleeve and act on the permanent magnet rotor. On the other hand, the metal shielding sleeve 209 carries the heat generated by the stator away from the pump body through the water flow, thus achieving the effect of heat dissipation for the stator.

[0056] See Figure 6 The shielding sleeve assembly 209 of the present invention is composed of a stator shielding sleeve 2091 for forming a stator cavity and a rotor shielding sleeve 2092. There is a gap between the stator shielding sleeve 2091 and the rotor shielding sleeve 2092 for forming a water flow channel in the rotor cavity, which can carry away the heat generated by the stator and realize heat dissipation of the stator.

[0057] See Figure 3 The ceramic bearing of the present invention includes a front ceramic bearing 208 for supporting the front end of a ceramic shaft facing the impeller assembly, and a rear ceramic bearing 205 for supporting the rear end of the ceramic shaft. The front and rear ceramic bearings 208 and 205 have gaps between themselves and the ceramic shaft 206 to allow a small amount of water to flow through the rotor cavity. This gap is used to form a water film between the front and rear ceramic bearings 208 and the ceramic shaft, and between the rear ceramic bearing 205 and the ceramic shaft, when the shaft rotates at high speed, thereby reducing bearing noise.

[0058] Figure 3 The front ceramic bearing 208 shown is a thrust bearing. Figure 3 As shown, the rear ceramic bearing 205 has the same structure as the front ceramic bearing 208 and is also a thrust bearing.

[0059] See Figure 4 The present invention also includes a front bearing bracket 210 for supporting the front ceramic bearing installed between the front ceramic bearing and the front cover 201 of the water pump motor. The front bearing bracket 210 has a water inlet hole for the rotor cavity water flow channel. The ceramic shaft 206 has a shaft water channel 2061 located at the shaft center and leading to the water inlet of the impeller assembly and a shaft water inlet hole 2062 connecting the shaft water channel 2061, so that the water pumped out by the impeller assembly enters and exits the rotor cavity, forming a small amount of circulating water flow in the rotor cavity.

[0060] The inlet of the impeller assembly is a negative pressure zone. After the liquid is accelerated by the impeller, it becomes pressurized, making the rear end of the impeller assembly a high-pressure zone. When the pump is working, the impeller is located between the high and low pressure zones. Under the influence of the pressure difference, it generates an axial thrust from the high-pressure zone to the negative pressure zone. This axial thrust acts on the ceramic shaft, causing the ceramic shaft 206 to move axially. Because ceramic bearings have low tensile strength, this axial movement of the ceramic shaft will cause damage to it.

[0061] The present invention uses a thrust bearing to prevent the ceramic shaft 206 from moving axially under axial thrust, thereby extending the service life of the ceramic shaft 206.

[0062] See Figure 4The front ceramic bearing 208 includes a ceramic sliding bearing 2081 that supports the ceramic rotating shaft 206, a limiting member 2083 that is fixedly installed on the ceramic rotating shaft 206, and a limiting sliding assembly 2082 installed between the ceramic sliding bearing 2081 and the limiting member 2083.

[0063] One end of the limiting sliding assembly 2082 is fixedly connected to the limiting member 2083, and the other end is in sliding contact with the ceramic sliding bearing 2081. The outer side of the ceramic sliding bearing 2081 is fixedly connected to the annular end 211 of the front bearing bracket 210. The thrust bearing 208 of this invention utilizes the limiting effect of the annular end 211 of the front bearing bracket 210 and the limiting member 8083 to prevent the ceramic shaft 206 from moving towards the negative pressure area, that is, to prevent the ceramic bearing 206 from... Figure 4 The ceramic bearing 206 moves to the right from the left. That is, when the ceramic bearing 206 moves to the right under the action of axial thrust, the limiting member 2083 fixed on the ceramic bearing 206 contacts the ceramic sliding bearing 2081 through the limiting sliding assembly 2082. Since the ceramic sliding bearing 2081 cannot move under the support of the front bearing bracket 210, it prevents the ceramic shaft 206 from moving to the right.

[0064] because Figure 4 The rear ceramic bearing 205 shown also has the same structure as the front ceramic bearing 208, but in the opposite direction, thus preventing the ceramic shaft 206 from moving to the left.

[0065] Figure 4 The limiting component 2083 shown can be a rubber limiting component, and the limiting sliding component 2082 can be a graphite ring.

[0066] The impeller shaft 302 is a stainless steel shaft that is fitted onto the ceramic shaft 206 via a hot-pressing process. The impeller assembly includes at least two impeller units.

[0067] See Figure 7 Each impeller unit consists of an impeller 301 and a guide plate 300. The impeller 301 is movably fitted onto the impeller shaft 302, and the guide plate 300 is fixedly connected to the pipe sleeve 100. The impeller shaft 302 of this invention is a hexagonal stainless steel shaft. The diameter of the central hole of the guide plate 300 is larger than the outer diameter of the impeller shaft 302, and therefore it does not rotate with the rotation of the impeller shaft. The impeller 301 of this invention is a component with an internal spiral water flow channel and has a shape adapted to the hexagonal stainless steel shaft, thus it can rotate with the rotation of the impeller shaft. Simultaneously, there is a gap between the impeller 301 and the impeller shaft 302, allowing it to move axially. This design of the present invention can reduce the axial force exerted by the impeller 301 on the impeller shaft and can also avoid the tolerance fit of fixing the impeller 301 to the impeller shaft. See also Figure 7The rear end of the impeller 301 and the guide vanes of the guide plate 300 together form a guide vane cavity, which is used to rectify the water flow with different directions formed after the impeller rotates, so that the water flow output by each impeller unit tends to be consistent.

[0068] The inverter assembly 104 of the present invention, used for controlling the operation of a motor, enables the motor rotor to gradually increase from low speed to high speed, achieving a soft start for the ceramic shaft 20 and avoiding start-up breakage due to the weak shock resistance of the ceramic shaft 20. The inverter assembly 104 of the present invention is a power supply device that converts direct current into alternating current with a variable frequency. To avoid the technical problem of start-up breakage due to the weak shock resistance of the ceramic shaft 20, the present invention achieves this by gradually changing the inverter frequency from low to high, thus transitioning the ceramic shaft 20 from low-speed to high-speed rotation.

[0069] Figure 4 The diagram shows the water flow path of the silent booster water pump of the present invention. The water flow from the water pump inlet 105 is pressurized by the impeller assembly and then passes through the heat dissipation channel between the stainless steel sleeve 100 and the motor housing to reach the water outlet pipe 400.

[0070] Figure 8-10 Another embodiment of the front-end ceramic bearing 208 of the present invention is shown. Since the axial thrust is primarily the axial thrust of the impeller from the high-pressure zone to the low-pressure zone, this axial thrust causes the ceramic shaft 206 to move towards the low-pressure zone. Therefore, the front-end ceramic bearing 208 plays a major role in preventing the ceramic shaft 206 from moving. To this end, this embodiment employs the following technical solution for the front-end ceramic bearing 208:

[0071] 1) Reduce sliding friction loss between the ceramic sliding bearing 2081 and the limiting sliding assembly 2082. Lower friction loss results in higher motor speed for a given power output, leading to better impeller boosting effect. Specific technical measures include:

[0072] See Figure 8 The diameter of the front ceramic sliding bearing 2081 is increased to be larger than that of the rear ceramic bearing 2051, and the outer diameter of the limiting sliding component 2082 is made to be comparable to that of the ceramic sliding bearing 2081. This increases the sliding contact area between the limiting sliding component 2082 and the ceramic sliding bearing 2081, reduces the pressure of the limiting sliding component 2082 on the ceramic sliding bearing 2081 per unit area, and thus reduces the coefficient of friction.

[0073] By employing friction pair materials with poor miscibility, the coefficient of friction is effectively reduced. This invention uses a combination of silicon carbide and ceramic as friction pair materials to fabricate the limiting sliding component 2082 and the ceramic sliding bearing 2081, thereby effectively reducing the coefficient of friction.

[0074] Furthermore, increasing the surface thickness of the sliding surface can effectively reduce the coefficient of sliding friction. Because it uses a large-diameter silicon carbide slip ring and a large-diameter ceramic sliding bearing, and operates submerged in water, the increased contact area allows for the formation of a larger sliding surface film.

[0075] Since the entire shielded motor is submerged in water, the heat generated by friction is carried away by the water flow in time, which can ensure that the whole machine operates at a lower temperature and also reduce the coefficient of friction.

[0076] This invention reduces friction by decreasing the coefficient of friction, thereby reducing the sliding friction loss between the ceramic sliding bearing 2081 and the limiting sliding assembly 2082.

[0077] 2) The end of the front bearing bracket 210 that connects to the ceramic sliding bearing 2081 includes an annular end 211 for sleeved ceramic sliding bearing 2081 and a connecting end 212 for connecting the ceramic sliding bearing 2081 to the impeller side, which increases the ability of ceramic sliding bearing 2081 to withstand axial thrust.

[0078] 3) The limiting component 2083 is a limiting copper sleeve 20830, and the end of the limiting copper sleeve 20830 facing the limiting sliding assembly 2082 has a positioning groove 20831; the limiting copper sleeve is interference-fitted with the ceramic rotating shaft 206 and is installed on the ceramic rotating shaft 206 by cold pressing assembly. The axial thrust of the ceramic rotating shaft 206 is transmitted to the limiting sliding assembly 2082 through the limiting copper sleeve, and the axial thrust of the ceramic rotating shaft 206 is stopped by the ceramic bearing 2081.

[0079] 4) The limiting sliding assembly 2082 consists of a silicon carbide ring 20820 and a metal housing 20821. The metal housing 20821 has a positioning key 20822 that inserts into the positioning groove 20831. The limiting sliding assembly 2082 uses the positioning groove 20831 to mount the positioning key 20822 to a position close to the limiting copper sleeve 20830. The limiting sliding assembly 2082 ensures synchronous rotation with the ceramic rotating shaft 206 through the positioning key 20822 inserted into the positioning groove 20831.

[0080] In summary, the pipeline-type silent intelligent booster pump of this invention, in addition to preventing axial movement of the ceramic shaft, also has the following technical features: 1. It uses low DC voltage to power the inverter, ensuring that even if the motor submerged in the pipeline leaks electricity, it will not endanger personal safety. 2. It adopts a stainless steel shielding design for the motor stator and rotor, eliminating the need for mechanical seals and reducing maintenance costs. 3. The motor uses a ceramic shaft with ceramic sliding bearings. When the shaft rotates at high speed, a water film forms between the ground ceramic shaft and the ceramic sliding bearing, reducing bearing noise. 4. By controlling the rotor's soft start and then accelerating through inverter control, it solves the problem of the ceramic shaft's weak impact resistance leading to breakage during startup, achieving stable high load and high speed for the ceramic shaft. 5. The pump shaft uses a hot-pressing nesting process between the ceramic shaft and the stainless steel shaft. The ceramic round shaft serves as the motor rotor shaft, while the stainless steel shaft uses a hexagonal shaft to fit with the impeller shaft hole, solving the problem of not being able to machine the ceramic shaft to fit with the impeller shaft hole. 6. A clearance fit design between the hexagonal stainless steel shaft and the impeller shaft hole is adopted, allowing the impeller to move freely axially. The axial movement range of the impeller is limited by the ceramic washer on the guide plate and the 304 stainless steel cover plate. When the rotor rotates, it will not be subjected to axial force caused by the pressure difference before and after the impeller, and only radial torque is provided to the impeller. 7. The motor stator and inverter are completely enclosed in a stainless steel shielding sleeve, allowing the motor to be installed inside the pipeline. Water flows through the outside of the motor, achieving overall heat dissipation for the motor and controller, improving the motor power density, and reducing the motor size. 8. A single-phase valve with an integrated magnet is used and installed in the outlet pipe. When the one-way valve is closed, the plunger drives the magnet to reset. The magnet reset can be sensed by a magnetic sensing element outside the outlet pipe, realizing automatic shutdown of the electric pump. 9. This patent highly integrates the permanent magnet motor, pump, sensor, and inverter into a single "pipeline". It is small in size, and the inlet and outlet are on the same horizontal line. It can be directly installed along the water supply pipeline without the need for adapter fittings, saving space, and achieving intelligent constant pressure control.

[0081] Although the present invention has been described in detail above, it is not limited thereto, and those skilled in the art can make various modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood to fall within the protection scope of the present invention.

Claims

1. A pipeline-type silent intelligent booster water pump, comprising: The inlet and outlet pipes are installed at both ends of the pipe sleeve; An impeller assembly installed inside a pipe sleeve and facing the water inlet; A water pump motor for driving the impeller assembly to rotate is disposed within the pipe sleeve; and The rotor chamber of the water pump motor is connected to the outlet of the impeller assembly; The rotor cavity of the water pump motor is equipped with: Ceramic shaft used as a water pump motor shaft; A ceramic bearing supporting the ceramic shaft, the ceramic bearing being a thrust bearing used to prevent axial movement of the ceramic shaft under axial thrust; and Rotor assembly mounted on the ceramic shaft.

2. The pipeline-type silent intelligent booster water pump according to claim 1, wherein, The ceramic bearing includes a front ceramic bearing and a rear ceramic bearing, and a front bearing bracket for supporting the front ceramic bearing is installed between the front ceramic bearing and the front cover of the water pump motor.

3. The pipeline-type silent intelligent booster water pump according to claim 2, wherein, The front-end ceramic bearing includes a ceramic sliding bearing that supports the ceramic shaft, a limiting member fixedly mounted on the ceramic shaft, and a limiting sliding assembly installed between the ceramic sliding bearing and the limiting member.

4. The pipeline-type silent intelligent booster water pump according to claim 3, wherein, One end of the limiting sliding assembly is fixedly connected to the limiting component, and the other end is in sliding contact with the ceramic sliding bearing; the outer side of the ceramic sliding bearing is fixedly connected to the annular end of the front bearing bracket.

5. The pipeline-type silent intelligent booster water pump according to claim 3, wherein, The diameter of the front ceramic sliding bearing is larger than that of the rear ceramic bearing, and the outer diameter of the limiting sliding assembly is similar to that of the ceramic sliding bearing, so as to increase the sliding contact area between the limiting sliding assembly and the ceramic sliding bearing.

6. The pipeline-type silent intelligent booster water pump according to claim 5, wherein, The end of the front bearing bracket that connects to the ceramic sliding bearing includes an annular end for fitting the ceramic sliding bearing and a connecting end for connecting the ceramic sliding bearing to the impeller side, which increases the ceramic sliding bearing's ability to withstand axial thrust.

7. The pipeline-type silent intelligent booster water pump according to claim 6, wherein, The limiting component is a limiting copper sleeve, and the end of the limiting copper sleeve facing the limiting sliding component has a positioning groove; the limiting copper sleeve is interference-fitted with the ceramic rotating shaft and is installed on the ceramic rotating shaft by cold pressing assembly.

8. The pipeline-type silent intelligent booster water pump according to claim 6, wherein, The limiting sliding assembly consists of a silicon carbide ring and a metal housing for fixing the silicon carbide ring; the metal housing has a positioning key that is inserted into a positioning groove. The positioning key is installed in a position close to the limiting copper sleeve through the positioning groove, so that the limiting sliding assembly can rotate synchronously with the ceramic shaft through the positioning key inserted into the positioning groove.

9. The pipeline-type silent intelligent booster water pump according to claim 2, wherein, The front and rear ceramic bearings have gaps between themselves and the ceramic shaft to allow a small amount of water to flow through the rotor cavity. This gap is used to form a water film between the front and rear ceramic bearings and the ceramic shaft when the shaft rotates at high speed, thereby reducing bearing noise.

10. The pipeline-type silent intelligent booster water pump according to claim 9, wherein, The impeller assembly includes at least one impeller unit, each impeller unit consisting of an impeller and a guide plate, the impeller being movably sleeved on the impeller shaft, and the guide plate being fixedly connected to the pipe sleeve.

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