Centrifugal pump integrated with electric heating assembly

Abstract

A centrifugal pump integrated with an electric heating assembly comprises a stator assembly with a waterproof shell, a rotor assembly with an impeller, a base, a heating assembly and a pump cover, the stator assembly is arranged in the center of the upper end of the base, the stator assembly and the pump cover are closed in a facing mode to form a heating cavity surrounding the stator assembly, and in the closed state, the heating assembly is arranged in the heating cavity. An impeller cavity for accommodating the impeller is defined between the pump cover and the axial direction of the stator assembly; the electric heating assembly comprises an electric heating pipe and a hollow columnar isolation part which is cast on the electric heating pipe and wraps the electric heating pipe, the electric heating assembly is fixed to the base and located in the heating cavity, the heating cavity is divided into an inner circumferential flow channel and an outer circumferential flow channel which are located on the radial inner side and the radial outer side of the heating cavity, and a water passing opening for communicating the impeller cavity with the inner circumferential flow channel is formed in the waterproof shell and / or the pump cover. A water passing opening communicating with the inner circumferential flow channel and the outer circumferential flow channel is formed in the radial direction of the isolation part. According to the centrifugal pump integrated with the electric heating assembly, the inner peripheral flow channel and the outer peripheral flow channel of the whole pump can be formed through few parts and assembly procedures, the production and assembly difficulty is lowered, and the assembly efficiency of the centrifugal pump is improved.

Description

Technical Field

[0001] The invention relates to a centrifugal pump integrated with an electric heating component, and its IPC classification number is F04D 13 / 06. Background Art

[0002] The existing pump with heating function is shown in patent publication number CN114060288A. The pump includes a heater body, a rotor assembly, a pump cover, an inner water-proof sleeve and a pump body, etc. The heater body includes an inner peripheral flow channel sleeve, an annular cylindrical outer peripheral flow channel sleeve and a cylindrical heater. The heater is installed in a chamber surrounded by the inner and outer peripheral flow channel sleeves. The heater body and the inner and outer peripheral flow channels of the pump are complex in structure and complicated in assembly, which affects production efficiency and product reliability.

[0003] For relevant terms and common knowledge, except as otherwise specified in this manual, please refer to the national standards GB / T 33925.1 "General terms, definitions, quantities, characters and units for liquid pumps and their devices Part 1: Liquid pumps" and GB / T 7021 "Terms and definitions of centrifugal pumps", the machinery industry standard JB / T5415 "Miniature centrifugal electric pumps", the Mechanical Industry Press's 1983 or 1997 edition of the Mechanical Engineering Handbook and the Electrical Engineering Handbook, the Mechanical Industry Press's 2014 edition of Pump Theory and Technology, the China Aerospace Press's 2011 edition of Modern Pump Theory and Technology, the China Electric Power Press's 2008 edition of Pumps and Fans, and patent document CN114060288A. Summary of the invention

[0004] In order to solve the problems described in the background technology, the present invention provides the following technical solutions:

[0005] A centrifugal pump integrated with an electric heating component comprises a stator assembly, a rotor assembly with an impeller at one end and a pump cover with inlet and outlet pipes, the stator assembly comprising a stator part and a water-proof shell accommodating the stator part, the rotor assembly being rotatably accommodated in an inner cavity of the water-proof shell, and characterized in that it also comprises: a base, on which the stator assembly is placed at the center of the upper end, which, when engaged with the pump cover, forms a heating cavity surrounding the stator assembly and connected to the water outlet pipe, and the axial space between the pump cover and the stator assembly forms an impeller cavity that accommodates the impeller and is connected to the water inlet pipe; an electric heating component, comprising an electric heating tube and a hollow cylindrical isolating portion cast on the electric heating tube and wrapping it, which is fixed to the base and located in the heating cavity, the isolating portion divides the heating cavity into an inner peripheral flow channel located radially inwardly thereof and an outer peripheral flow channel located radially outwardly thereof, a water inlet connecting the impeller cavity and the inner peripheral flow channel is provided on the water-proof shell and / or the pump cover, and a water inlet connecting the inner peripheral flow channel and the outer peripheral flow channel is provided in the radial direction of the isolating portion.

[0006] The centrifugal pump integrated with the electric heating component of the present invention has an isolation portion formed by integrally casting with the electric heating tube and is accommodated in a heating chamber surrounded by the pump cover and the base, and together with the water-proof shell of the stator assembly fixed on the base, separates the heating chamber into an inner flow channel and an outer flow channel. The entire pump can form the inner and outer flow channels with fewer parts and assembly steps, thereby reducing the difficulty of production and assembly and improving the assembly efficiency of the centrifugal pump.

[0007] Furthermore, the isolating part and the base are integrally cast based on the electric heating tube, and the water outlet includes a first water outlet and / or a first notch radially opened on the columnar outer periphery of the isolating part.

[0008] Furthermore, the isolating part and the base are detachably fixedly connected, and the connection is provided with a second sealing ring, and the water outlet includes a first water outlet and / or a first notch radially opened on the cylindrical outer periphery of the isolating part.

[0009] Furthermore, a base hole extending to the outside of the electric heating tube is provided on the side of the base axially facing away from the pump cover.

[0010] Furthermore, the outer surface of the isolating portion is provided with a fan-shaped guide block formed by a convex rib protruding axially close to one side of the base.

[0011] Furthermore, the isolating portion is located in the axial space between the guide block and the base and is further provided with a first opening which radially penetrates the inner peripheral flow channel and the outer peripheral flow channel.

[0012] Furthermore, a fourth guide block is provided directly above the first opening.

[0013] Furthermore, the radial outer surface of the water-blocking shell has a protruding annular water retaining portion at one end away from the impeller, the distance from the top of the first opening to the horizontal plane is L2, and the distance from the end surface of the water retaining portion facing the impeller to the horizontal plane is L3, then L2 is less than L3.

[0014] Furthermore, if the distance from the top of the first water outlet to the horizontal plane is L1, then L1 is greater than L3.

[0015] Furthermore, the electric heating tube includes a tubular heating portion surrounding the heating cavity, and in the projection of the axial section, the distance H1 from the axial end surface of the guide block facing the base to the horizontal plane is less than or equal to the distance H2 from any point on the contour line of the heating portion to the horizontal plane.

[0016] Furthermore, a plurality of guide blocks are provided on the outer surface of the isolating portion axially above the guide block.

[0017] Furthermore, the outer surface of the isolating portion is further provided with a dividing block formed by radially raised ribs for dividing the first water outlet or the first notch.

[0018] Furthermore, the guide block includes a first guide block close to the guide block and a second guide block close to the end surface of the pump cover, and the partition block includes a first partition block extending at one end to the base and connected to the guide block at the other end, and a second partition block extending at one end to the upper end of the base and connected to the second guide block at the other end.

[0019] Furthermore, the radial outer surface of the isolation portion also protrudes a first rib connecting the first guide block and the first water outlet.

[0020] Furthermore, the electric heating tube also includes a first external connection part connected to one end of the heating part and a second external connection part located radially outside the heating part and connected to the heating part. The radial surface raised ribs of the isolation part wrap around the second external connection part to form a fifth guide block, and a partition space is set circumferentially between the fifth guide block and the guide blocks.

[0021] Furthermore, the radial surface protruding rib of the isolation portion located on the other side of the fifth guide block in the circumferential direction forms a sixth guide block, and the fifth guide block and the sixth guide block are not connected to each other in the circumferential direction.

[0022] Furthermore, the angle γ between the fifth guide block and the horizontal plane is an acute angle.

[0023] Furthermore, the pump cover is a cylindrical body with an end surface at one end and an open end at the other end. The lower side of the end surface is axially concave to form a water outlet trough with a water outlet. The outer surface of the isolation part has radially raised ribs to form a baffle block, which extends axially from the top of the isolation part to the bottom.

[0024] Furthermore, an included angle α between the extending direction of the blocking block and the end surface of the base is greater than or equal to 90°.

[0025] Furthermore, the first water outlet and the first notch are located on one circumferential side of the blocking block, and the water outlet groove is located on the other circumferential side of the blocking block.

[0026] Furthermore, the radial surface of the isolating portion protrudes radially in the area between the end of each guide block and the blocking block to form a columnar heat-conducting column.

[0027] Further, the inner surface of the isolation portion is radially concave or convex to form a heat conducting portion extending from the top end to the bottom end of the isolation portion.

[0028] Furthermore, the water-proof shell is integrally formed by injection molding based on the stator part, and includes a cylindrical inner shell part with an opening at one end covering the pole arc surface of the iron core of the stator part, an upper end part extending radially outward from the outer edge of the opening of the inner shell part, a lower end part extending outward from the side of the inner shell part away from the opening, and an outer shell part connecting the upper and lower ends, and the stator part is wrapped in a stator cavity surrounded by the inner and outer shell parts and the upper and lower ends.

[0029] Furthermore, the waterproof shell is an independent injection molded part, including an inner shell portion having a hollow chamber, an outer shell portion located radially outside the inner shell portion, and an upper end portion connecting the two, and the stator portion is installed in a stator cavity surrounded by the inner shell portion, the outer shell portion and the upper end portion.

[0030] Furthermore, the water-proof shell further comprises an annular peripheral edge portion located at the upper end portion and a spiral guide rib protruding from the radial outer surface of the outer shell portion, and the water outlet comprises a notch arranged on the peripheral edge portion.

[0031] Furthermore, one end of the guide rib is connected to the notch, and the other end extends to the bottom end of the watertight shell, and in the assembled state, the notch and the water outlet are respectively located on both sides of the circumference of the guide rib.

[0032] Furthermore, the pump cover is concave toward the axial surface of the rotor assembly to form a concave portion, and the axial end surface of the concave portion protrudes a water guide block with a pump cover notch, the water outlet includes the pump cover notch, and the pump cover notch is connected to the notch correspondingly, the area of ​​the axial cross-section of the water guide block gradually decreases along the rotation direction of the rotor assembly, and in the projection view of the same plane perpendicular to the axis, the projection of the water guide block is located within the projection of the surrounding edge portion.

[0033] The more specific design and technical effects of the present invention are further explained in the specific implementation manner in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional structural schematic diagram of the centrifugal pump of the present invention;

[0035] Figure 2 It is a schematic diagram of the exploded structure of the centrifugal pump of the present invention;

[0036] Figure 3 is an axial cross-sectional view of the centrifugal pump of the present invention at the cutting plane A;

[0037] Figure 4 is an axial cross-sectional view of the centrifugal pump of the present invention at the cutting plane B;

[0038] Figure 5 It is a three-dimensional structural schematic diagram of the electric heating component of the present invention;

[0039] Figure 6 is a front view of the electric heating assembly of the present invention;

[0040] Figure 7 It is a schematic diagram of the three-dimensional structure of the electric heating tube of the present invention;

[0041] Figure 8 It is a three-dimensional structural schematic diagram of the electric heating component of the present invention with a notch;

[0042] Fig. 9is a schematic diagram of the three-dimensional structure of the electric heating component of the present invention from another angle;

[0043] Fig.10 is a top view of the electric heating component of the present invention;

[0044] Fig.11 It is a three-dimensional structural schematic diagram of the pump cover of the present invention;

[0045] Fig.12 is a three-dimensional structural schematic diagram of a stator assembly of the present invention;

[0046] Fig.13 is an axial cross-sectional view of a stator assembly of the present invention;

[0047] Fig.14 is a radial cross-sectional view of a centrifugal pump of the present invention;

[0048] Fig.15 It is a schematic diagram of the flow trajectory of the centrifugal pump of the present invention in the inner peripheral flow channel;

[0049] Fig.16 It is a schematic diagram of the flow trajectory of the centrifugal pump of the present invention in the peripheral flow channel;

[0050] Fig.17 is a schematic diagram of the exploded structure of the second embodiment of the electric heating component of the present invention;

[0051] Fig.18 is an axial cross-sectional view of a second embodiment of the electric heating assembly of the present invention;

[0052] Fig.19 is an axial cross-sectional view of a second embodiment of a centrifugal pump of the present invention;

[0053] Fig. 20 is a schematic diagram of the exploded structure of a second embodiment of a stator assembly of the present invention;

[0054] Fig.21 is an axial cross-sectional schematic diagram of a second embodiment of a stator assembly of the present invention;

[0055] Fig. 22 is an axial cross-sectional view of a third embodiment of a centrifugal pump of the present invention;

[0056] Fig.23 is an axial cross-sectional view of a fourth embodiment of a centrifugal pump of the present invention;

[0057] in:

[0058] 1-inner flow channel, 1′-inner flow channel, 1″-inner flow channel, 2-outer flow channel, 2′-outer flow channel, 2″-outer flow channel, 3-electrical chamber, 3′-electrical chamber, 4-stator chamber, 4′-stator chamber, 4″-stator chamber, 5-heating chamber, 5-heating chamber′, 6-impeller chamber, 6′-impeller chamber, 11-first guide block, 11′-first guide block, 12-second guide block, 12′-second guide block, 13-third guide block, 13′-third guide block, 14-fourth guide block, 14′-fourth guide block, 15-first partition block, 15′-first partition block, 16-second partition block, 16′-second partition block, 17-first rib, 17′-first rib rib, 18-fifth guide block, 18′-fifth guide block, 19-sixth guide block, 19′-sixth guide block 21-lower peripheral flow channel, 21′-lower peripheral flow channel, 2″-lower peripheral flow channel, 22-upper peripheral flow channel, 22′-upper peripheral flow channel, 22″-upper peripheral flow channel, 100-electric heating component, 100′-electric heating component, 110-electric heating pipe, 111-heating part, 112-first external part, 113-second external part, 120-metal shell, 120′-metal shell, 121-first water outlet, 121′-first water outlet, 122-blocking block, 122′-blocking block, 123-guide block, 123′-guide block, 124-separator block, 1 24′-separator block, 125-heat-conducting column, 125′-heat-conducting column, 126-first opening, 126′-first opening, 127-guide block, 127′-guide block, 128-heat-conducting part, 128′-heat-conducting part, 129-first notch, 130-base, 130-base hole, 130′-base, 130″-base, 131-bottom ring, 131′-bottom ring, 131″-bottom ring, 132″-inner ring, 200-rotor assembly, 210-rotating shaft, 220-main body, 230-impeller, 240-permanent magnet, 300-stator assembly, 300′-stator assembly, 310-stator part, 311-iron core, 312-skeleton, 313- Enameled wire, 320-waterproof shell, 320′-waterproof shell, 320″-waterproof shell, 321-inner shell, 321′-inner shell, 322-upper end, 322′-upper end, 323-lower end, 323′-outer shell, 324-outer shell, 325-notch, 325′-notch, 326-edge, 326′-edge, 327-guide rib, 327′-guide rib, 328-water retaining part, 400-pump cover, 410-pump cover end face, 411-water outlet, 412-water outlet groove, 420-drainage groove, 421-water guide block, 422-pump cover notch, 430-water inlet pipe, 440-drainage pipe, 720-second sealing ring, 730-screw DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] As shown in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. When describing the structure of the present invention, the side where the water inlet pipe is located is the upper end or top end, and the opposite side is the lower end or bottom end; the circumferential direction is the direction of rotation around the same axis starting from a certain feature, with clockwise rotation being one side of the circumference and counterclockwise rotation being the other side of the circumference. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0061] The present invention discloses a centrifugal pump integrated with an electric heating component. Figures 1 to 3 The centrifugal pump includes a base 130, an electric heating component 100 fixedly connected to the base, a rotor component 200, a stator component 300, a pump cover 400 connected to the base 130, and a rotating shaft 210 fixed to the stator component 300 and sleeved by the rotor component 200.

[0062] See Figures 2 to 5The main body of the electric heating component 100 is a columnar body with a hollow cavity, and a water outlet is provided in the radial direction; the rotor assembly 200 includes a main body 220, a permanent magnet 240 fixed to one axial side of the main body 220, and an impeller 230 fixed to the other axial side of the main body 220; the stator assembly 300 includes a stator part 310 and a water-proof shell 320 separating the liquid from the stator part 310, and the stator part 310 includes an iron core 311, a skeleton 312 fixed on the iron core, and an enameled wire 313 wound on the skeleton 312; the pump cover 400 is a cylindrical body with one end open, and the other end has an end face 410, a water inlet pipe 430 for water supply is provided in the center of the end face 410, and a drainage pipe 440 for drainage is provided on the periphery of the cylindrical body, and a water outlet is provided on the pump cover 400 and / or the water-proof shell 320. During installation, the stator assembly 300 is arranged at the upper end of the base 130 and is located in the columnar cavity of the electric heating assembly 100. The rotor assembly 200 can be rotatably installed on the stator assembly 300 provided with a rotating shaft 210. After the pump cover 400 and the base 130 are fixed together, they are enclosed with the stator assembly 300 to form a heating chamber 5, preferably fixed by screws. After the installation is completed, the electric heating assembly 100 is located between the outer peripheral side of the stator assembly 300 and the inner peripheral wall of the pump cover 400, and the heating chamber 5 is divided into an inner peripheral flow channel 1 located on the radial inner side thereof and an outer peripheral flow channel 2 located on the radial outer side thereof. The pump cover 400 and the upper end surface of the stator assembly 300 enclose an impeller chamber 6 for accommodating the impeller 230, wherein the water inlet pipe 430 of the pump cover is connected to the impeller chamber 6, the water inlet connects the inner peripheral flow channel 1 with the impeller chamber 6, and the water outlet connects the inner peripheral flow channel 1 with the outer peripheral flow channel 2.

[0063] Embodiment 1:

[0064] like Figure 5-6 As shown, the base 130 of this embodiment is integrally cast with the electric heating component 100, preferably cast with cast aluminum material. The electric heating component 100 includes an electric heating tube 110 and a hollow cylindrical isolating portion 120 that wraps the main body of the electric heating tube 110 (only the terminal portion is exposed). The upper end of the hollow column is open, and the lower end is connected to the base 130. After the base 130 and the pump cover 400 are matched to form the heating chamber 5, the isolating portion 120 separates the heating chamber 5 into an inner peripheral flow channel 1 located radially inside thereof and an outer peripheral flow channel 2 located radially outside thereof. The water outlet may be a first water outlet 121 designed at the lower end of the isolating portion 120 near the base 130 to radially penetrate the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation. In other embodiments, the water outlet may also be any through hole provided at other positions on the outer peripheral surface of the isolating portion 120 to radially penetrate the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation, or even as Figure 7As shown, there is a first notch 129 at the top of the isolation part 120 that radially penetrates the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation. The centrifugal pump of the present invention adopts an integrated casting process to integrate the isolation part 120 and the base 130 based on the electric heating tube 110. The whole pump can form the inner and outer peripheral flow channels with fewer parts and assembly processes, which reduces the difficulty of production and assembly, and improves the assembly efficiency and anti-leakage performance of the centrifugal pump. Fig.10 In this embodiment, the base 130 is provided with a base hole extending to the outside of the electric heating tube 110 on the side axially away from the pump cover 400. This design allows the components in the mold to extend into and clamp the electric heating tube 110 during integral casting, thereby preventing the electric heating tube 110 from being displaced during the casting process, resulting in the isolation part 120 being unable to fully wrap the electric heating tube 110, thereby affecting the heating performance of the centrifugal pump.

[0065] Preferably, see Figure 2 and Figure 3 The centrifugal pump of the present invention further comprises a bottom plate 500 and a circuit board 600. The outer edge of the lower end of the base 130 axially protrudes with an annular bottom ring 131. The bottom plate 500 is covered on the bottom ring 131 and forms an electrical cavity 3 with the base. The circuit board 600 is installed in the electrical cavity 3. This design integrates the circuit board into the centrifugal pump, which is convenient for regulating the temperature of the instant hot liquid. Further, see Figure 3 , Figure 4 and Figure 6 In order to reduce the heat transfer from the electric heating component to the base 130 and affect the operation of the circuit elements located on the axial side of the base 130, the isolation portion 120 is further provided with a first opening 126 radially penetrating the inner peripheral flow channel 1 and the outer peripheral flow channel 2 in the connection area between the isolation portion 120 and the base 130, and a fourth guide block 14 is further provided directly above the first opening 126.

[0066] See Figure 3 and Figure 4 , the outer surface of the isolation portion 120 is provided with a fan-shaped guide block 127 formed by raised ribs on the axial side close to the base 130. Preferably, the guide block 127 separates the peripheral flow channel 2 into a lower peripheral flow channel 21 close to the base 130 and an upper peripheral flow channel 22 located above the lower peripheral flow channel 21. Of course, as other embodiments, the guide block 127 can be a raised rib in the peripheral flow channel 2 to play a guiding role, and it is not necessary to separate the peripheral flow channel 2. This design allows the circuit board located at the lower end of the base to dissipate heat through a liquid with a lower temperature, thereby improving the heat dissipation effect of the circuit board. Further, see Figure 3 and Figure 7The electric heating pipe 110 includes a tubular heating portion 111 surrounding the heating chamber 5 and an external portion connected to the heating portion 111 and extending axially outward. In order to reduce the heat transfer of the electric heating pipe 110 to the lower peripheral flow channel 21, the centrifugal pump is placed in a vertical state (the axis of the centrifugal pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the centrifugal pump, the distance H1 from the end face of the guide block 127 facing the base 130 to the horizontal plane S is less than or equal to the distance H2 from any point on the contour line of the heating portion 111 to the horizontal plane S.

[0067] Further, see Figure 7 In order to improve the heating speed of the centrifugal pump, the external connection part of the electric heating pipe 110 of the present invention includes a first external connection part 112 connected to one end of the heating part 111 and a second external connection part 113 located radially outside the heating part 111 and connected to the heating part 111. Preferably, Figure 8 and Fig. 9 In order to improve the heating efficiency and make the liquid flow smoothly, the radial surface protruding ribs of the isolation part 120 wrap the second external part 113 to form the fifth guide block 18, and the circumference of the fifth guide block 18 and the guide block 123 are separated by a partition space. Furthermore, the radial surface protruding ribs of the isolation part 12 located on the other side of the circumference of the fifth guide block 18 form the sixth guide block 19, and the fifth guide block 18 and the sixth guide block 19 are not connected to each other in the circumference. In order to further reduce the fluctuation of the liquid flow and improve the stability of the liquid flow in the centrifugal pump, when the centrifugal pump is placed horizontally, the angle γ between the fifth guide block 18 of the centrifugal pump and the horizontal plane is an acute angle.

[0068] See Figure 5 In order to increase the contact area between the liquid and the isolation part 120 and allow the heat of the electric heating pipe to be more easily transferred to the liquid in the peripheral flow channel, the outer surface of the isolation part 120 is located above the axial direction of the guide block 127 and is further provided with a plurality of guide blocks 123. Figure 3 and Figure 5, the outer surface of the isolation part 120 also radially protrudes with a partition block 124 that separates the first water outlet 121. In specific implementation, the guide block 123 includes a first guide block 11 close to the guide block 127, a second guide block 12 close to the end face of the pump cover, and a third guide block 13 arranged therebetween, and the partition block 124 includes a first partition block 14 with one end extending to the upper end of the base 130 and the other end connected to the guide block 127, and a second partition block 15 with one end extending to the upper end of the base 130 and the other end connected to the second guide block 12. Through the above design, the liquid entering the peripheral flow channel from the first water outlet 121 can be diverted and guided, reducing the impact of the liquid on the electric heating component and the pump cover when flowing, and reducing the vibration of the centrifugal pump when working. Similarly, when the water outlet connecting the inner peripheral flow channel 1 and the outer peripheral flow channel 2 is the first notch 129, the radial outer surface of the isolation part can also be provided with a guide block 123 and a partition block 124. Preferably, see Figure 5 and Fig.11 The radial outer surface of the isolation part 120 of the electric heating component 110 protrudes a rib-shaped barrier block 122 extending axially from the top of the isolation part to the bottom. The end surface 410 of the inner cavity of the pump cover 400 is axially concave to form a water outlet 412, and the water outlet 412 is provided with a water outlet 411 that connects the water outlet 412 with the drain pipe 440. Figure 3 After the centrifugal pump is assembled, the baffle block 122 of the isolating portion 120 separates the first water outlet 121 (or the first notch 129) on one side of the circumference close to the baffle block 122, and separates the water outlet 412 on the other side of the circumference close to the baffle block 122. The definition of close to the baffle block is in the axial projection of the centrifugal pump, see Fig.14 , the angle β formed by the line segment OA formed by the line connecting the axis O of the centrifugal pump and any point A on the contour line of the first water outlet 121 (or the first notch 129) and the line segment OB formed by the line connecting the axis O of the centrifugal pump and any point B on the contour line of the baffle block 122 are acute angles; similarly, the angle formed by the line segment formed by the line connecting the axis of the centrifugal pump and the points on the contour line of the water outlet trough 412 and the angle formed by the line segment formed by the line connecting the axis of the centrifugal pump and the contour line of the baffle block 122 are acute angles. The above design allows the liquid entering the peripheral flow channel 2 to rotate around the radial outer surface of the electric heating component for one circle before being discharged from the pump cover, thereby increasing the heat conduction time between the liquid and the electric heating component and improving the heating efficiency of the centrifugal pump. Preferably, see Figure 6 In order to reduce the impact of the liquid in the peripheral flow channel 2 on the blocking block 122, the angle α between the surface A1 where the extending direction of the blocking block 122 is located and the base end surface A2 is greater than or equal to 90°.

[0069] Further, see Figure 5In order to make the liquid flow more smoothly in the peripheral flow 2, the radial outer surface of the isolation portion 120 of the present invention also protrudes a first rib 17 that connects the first guide block 11 and the first water outlet 121.

[0070] Preferably, see Figure 3 and Figure 5 In order to facilitate the mixing of the heated liquid and discharge it, and reduce the fluctuation of the discharged water temperature, a columnar heat-conducting column 125 is protruded from the radial outer surface of the isolation portion 120 in the area between the end of the guide block and the baffle block 122 .

[0071] Preferably, see Figure 5 In order to increase the heat transfer area of ​​the liquid in the inner peripheral flow channel and improve the heating efficiency of the centrifugal pump, the radial inner surface of the isolation portion 120 is provided with an axially extending radially concave heat conducting portion 128. Of course, as other embodiments, the radial inner surface of the isolation portion 120 is provided with an axially extending radially protruding heat conducting portion, which can also achieve the purpose of increasing the heat transfer area of ​​the liquid in the peripheral flow channel.

[0072] The stator assembly of this embodiment is shown in FIG. Fig.12 and Fig.13 The stator assembly 300 includes a stator part 310 and a water-proof shell 320 formed by injection molding based on the stator part 310, wherein the water-proof shell 320 includes a cylindrical inner shell part 321 with one end opening on the arc surface of the iron core 311 of the stator part, an upper end part 322 extending radially outward from the outer edge of the opening of the inner shell part, a lower end part 323 extending outward from the side of the inner shell part away from the opening, and an outer shell part 324 connecting the upper end part 322 and the lower end part 323. The stator part 310 is wrapped in a stator cavity 4 surrounded by the inner shell part 321, the upper end part 322, the lower end part 323 and the outer shell part 324. When the centrifugal pump is assembled, the rotating shaft 210 is fixed to the inner shell part 321, and the rotor assembly 200 is rotatably sleeved on the rotating shaft 210. The overall structure of the stator assembly of this design is simple, and the inner shell part can be injection molded as a thin layer covering the arc surface of the iron core, which is convenient for the assembly of the centrifugal pump while taking into account the electromagnetic performance. Furthermore, in order to facilitate the sealing assembly between the stator assembly 300 and the base 130, the outer periphery of the lower end of the shell portion 324 radially protrudes an annular water retaining portion 328 outward. In order to prevent the liquid in the inner peripheral flow channel 1 from passing through the first opening 126 and entering the lower peripheral flow channel 22 to affect the displacement of the centrifugal pump, Figure 4, the centrifugal pump is placed vertically (the axis of the centrifugal pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the centrifugal pump, the water retaining portion 328 has the following design: if the distance from the top of the first opening 126 to the horizontal plane S is L2, and the distance from the end surface of the water retaining portion 328 facing the impeller to the horizontal plane S is L3, then L2 is less than L3. Furthermore, in order to make the liquid in the inner peripheral flow channel 1 enter the outer peripheral flow channel 2 more smoothly, the distance from the top of the first water outlet 121 to the horizontal plane S is L1, then L1 is greater than L3.

[0073] Preferably, see Figure 3 , Fig.12 and Fig.13 The outer edge of the upper end 322 of the water-blocking shell 320 also axially protrudes an annular rim portion 326. When the centrifugal pump is assembled, the rim portion 326 cooperates with the pump cover to enhance the enclosure effect of the impeller chamber. The water inlet includes a notch 325 arranged on the rim portion 326. When working, the liquid in the impeller chamber 9 flows into the inner peripheral flow channel 1 from the notch 325 under the push of the impeller 230. Further, a spiral guide rib 327 is protruded on the radial outer surface of the outer shell 324. The upper end of the guide rib 327 is connected to the notch 325 of the rim, and the other end extends to the water retaining portion 328 at the lower end of the water-blocking shell 320. When the centrifugal pump is assembled, the guide rib 327 separates the notch 325 and the water outlet that radially passes through the inner peripheral flow channel 1 and the outer peripheral flow channel 2 and is located on both sides of the circumference near the guide rib 327. This design allows the liquid entering the inner peripheral flow channel 1 to rotate around the radial outer surface of the water-blocking shell 320 for one circle before entering the outer peripheral flow channel 2, thereby increasing the heat conduction time between the liquid and the electric heating tube and improving the heating efficiency of the centrifugal pump.

[0074] See Fig.11 and Fig.14 , in order to further reduce the loss of kinetic energy when the liquid flows, and further improve the drainage efficiency of the centrifugal pump. The inner side of the end surface 410 of the pump cover 400 is axially sunken to form a concave portion 420, and the bottom end of the concave portion 420 is provided with a water guide block 421 formed by an axial protrusion, and the water outlet also includes a pump cover notch 422 arranged on the water guide block 421 of the pump cover. In the assembled state, the inner periphery of the surrounding edge portion 326 contacts the outer periphery of the water guide block 421, and the pump cover notch 422 is correspondingly connected to the notch 325. Preferably, the area of ​​the axial cross-section of the water guide block 421 gradually decreases along the rotation direction of the rotor assembly, and in the projection diagram of the same plane perpendicular to the axis, the projection of the water guide block 421 is located within the projection of the surrounding edge portion 326. Of course, as other embodiments, the pump cover axially protrudes a notched pump cover water retaining rib on the end surface of the rotor assembly, and the pump cover water retaining rib and the upper end surface of the stator assembly form an impeller cavity for accommodating the impeller, which can also achieve the above effect.

[0075] The working principle of the centrifugal pump of the present invention is shown in Figure 3 and Figures 14 to 16 When the centrifugal pump is working, the impeller 230 rotates and pushes the liquid into the inner peripheral flow channel 1 from the notch 325 (i.e., a1). The liquid is guided by the guide rib 327 in the inner peripheral flow channel 1 to the upper axial side of the guide rib 327 and rotates circumferentially for one circle (refer to the trajectory of a2) to the lower axial side of the guide rib 327 and to the first water outlet 121 (i.e., a3). The liquid passes through the first water outlet 121 and enters the outer peripheral flow channel 2. The liquid entering the outer peripheral flow channel 2 is blocked by the blocking block 122 from the first water outlet 121 (i.e., b1) to The axial lower side of the baffle block 122, at this time, a part of the liquid flows into the upper peripheral flow channel 22, and rotates one circle along the circumference (refer to the trajectory of b2) to flow to the axial upper side (i.e. b3) of the baffle block 122, and the other part of the liquid enters the lower peripheral flow channel 21, is separated by the partition block 127 and rotates one circle along the circumference (refer to the trajectory of b4) to flow to the axial upper side (i.e. b5) of the baffle block 122; the liquid flowing through the upper peripheral flow channel 22 and the lower peripheral flow channel 21 is mixed and then passes through the outlet 411 and is discharged from the drain pipe 440. The centrifugal pump of the present invention makes full use of the inner and outer peripheral flow channels formed by the liquid flowing through the electric heating component, the pump cover and the stator component for heat conduction, and has high heating efficiency, and the parts required for the electric heating component and the flow channel are simple in structure, which is convenient for automatic assembly.

[0076] Embodiment 2:

[0077] The centrifugal pump of this embodiment is different from the centrifugal pump of embodiment 1 in that the connection structure between the electric heating component and the base is different. The structure of the electric heating component 100' of this embodiment is as follows: Fig.17 and Fig.18 The electric heating component 100' includes an electric heating tube 110, an isolating portion 120' integrally cast with the electric heating tube 110, and a base 130' which is a disc-shaped body. The electric heating component 110' is fixed to the base 130' by screws, snaps or other commonly used connection processes in the "Mechanical Engineering Handbook". A first water outlet 121' is provided at the lower end of the isolating portion 120'. In order to improve the sealing between the electric heating component 110' and the base 130', a second sealing ring 720 is further provided between the base 130' and the electric heating component 110' in the axial direction, and the screws at the connection with the base will also be sealed with a corresponding sealing ring. The centrifugal pump assembly structure of this embodiment is shown in FIG. Fig.19 The working principle is the same as that of the first embodiment, which will not be described in detail. When the electric heating tube 110 of the centrifugal pump of this embodiment is burned out, the electric heating assembly 100' cast with the electric heating tube can be disassembled and replaced, which is conducive to reducing maintenance costs.

[0078] Embodiment 3:

[0079] The centrifugal pump of this embodiment is different from the centrifugal pump of Embodiment 1 in that the structure of the stator assembly 300' is different. Fig. 20 and 21The stator assembly 300' of this embodiment includes a stator assembly 310 and a waterproof shell 320' formed by independent injection molding. The waterproof shell 320' includes an inner shell 321' with a hollow chamber, an outer shell 323' located radially outside the inner shell, and an upper end 322' connecting the inner shell 321' and the outer shell 323'. The stator 310 is installed in the stator cavity 4' surrounded by the inner shell 321', the outer shell 323' and the upper end 322'. The centrifugal pump assembly structure of this embodiment is shown in FIG. Fig. 22 , the stator assembly 300' can be fixed to the base 130 by screws 730. After installation, the pump cover 400 axially abuts against the upper end surface of the watertight shell 320' to enclose and form an impeller cavity for accommodating the impeller. The working principle of the centrifugal pump of this embodiment is the same as that of the centrifugal pump of embodiment 1, which will not be repeated here. In the centrifugal pump of this design, the watertight shell of the stator assembly can effectively prevent liquid from passing through the watertight shell to cause damage to the stator part, and its overall structure is stable and easy to assemble.

[0080] Embodiment 4:

[0081] The centrifugal pump of this embodiment is different from the centrifugal pump of embodiment 1 in that the structure of the stator assembly is different. Fig.23 The waterproof shell 320" of the stator assembly in this embodiment is designed to have the same structure as the inner waterproof sleeve of the background patent, the base 130" has an axially protruding tubular inner ring portion 132" (i.e., the inner ring of the background patent), and the stator portion 310 is installed in the stator cavity 4" surrounded by the waterproof shell 320" and the base inner ring portion 132". The centrifugal pump of the above design can also achieve the effect of Example 1.

[0082] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A centrifugal pump integrated with an electric heating component, comprising a stator assembly (300, 300'), a rotor assembly (200) with an impeller (230) at one end, and a pump cover (400) with inlet and outlet pipes, wherein the stator assembly (300, 300') comprises a stator part (310) and a water-proof shell (320, 320') accommodating the stator part, and the rotor assembly (200) is rotatably accommodated in the inner cavity of the water-proof shell (320, 320'), characterized in that: Also includes: The base (130, 130') has the stator assembly (300, 300') placed at the center of the upper end, and the stator assembly (300, 300') is matched with the pump cover (400) to form a heating chamber (5, 5') that surrounds the stator assembly (300, 300') and is connected to the drain pipe (440), and the axial space between the pump cover (400) and the stator assembly (300, 300') forms an impeller chamber (6, 6') that accommodates the impeller (230) and is connected to the water inlet pipe (430); The electric heating component (100, 100') comprises an electric heating tube (110) and a hollow columnar isolating portion (120, 120') cast on the electric heating tube and wrapping it, which is fixed to a base (130, 130') and located in a heating chamber (5, 5'), the isolating portion (120, 120') divides the heating chamber (5, 5') into an inner peripheral flow channel (1, 1', 1") located on the radial inner side thereof and an outer peripheral flow channel (2, 2', 2") located on the radial outer side thereof, the water-proof shell (320, 320') and / or the pump cover (400) are provided with a water through hole connecting the impeller chamber (6, 6') and the inner peripheral flow channel (1, 1', 1"), and the isolating portion (120, 120') is provided with a water through hole connecting the inner peripheral flow channel (1, 1', 1") and the outer peripheral flow channel (2, 2', 2") in the radial direction.

2. The centrifugal pump with integrated electric heating component according to claim 1, characterized in that: The isolation part (120) and the base (130) are integrally cast based on the electric heating tube (110), and the water outlet comprises a first water outlet (121) and / or a first notch (129) radially opened on the columnar outer periphery of the isolation part (120).

3. The centrifugal pump with integrated electric heating component according to claim 2, characterized in that: The base (130) is provided with a base hole (131) extending to the outside of the electric heating pipe (110) on a side axially facing away from the pump cover (400).

4. The centrifugal pump with integrated electric heating component according to claim 1, characterized in that: The isolation part (120') and the base (130') are detachably fixedly connected, and the connection is provided with a second sealing ring (720). The water outlet includes a first water outlet and / or a first notch (129') radially opened on the cylindrical outer periphery of the isolation part (120').

5. The centrifugal pump with integrated electric heating component according to claim 2 or 4, characterized in that: The outer surface of the isolation part (120, 120') is provided with a fan-shaped guide block (127, 127') formed by a convex rib protruding on one side of the axial direction close to the base (130, 130').

6. The centrifugal pump with integrated electric heating component according to claim 5, characterized in that: The isolation part (120, 120') is located in the axial space between the guide block (127, 127') and the base (130, 130') and is also provided with a first opening (126, 126') radially penetrating the inner peripheral flow channel (1, 1', 1") and the outer peripheral flow channel (2, 2', 2") 7. The centrifugal pump with integrated electric heating component according to claim 6, characterized in that: A fourth guide block (14, 14') is also provided directly above the first opening (126, 126').

8. The centrifugal pump with integrated electric heating component according to claim 6, characterized in that: The radial outer surface of the water-blocking shell (320, 320') has a protruding annular water retaining portion (328, 328') at one end away from the impeller, the distance from the top of the first opening (126, 126') to the horizontal plane is L2, and the distance from the end surface of the water retaining portion (328, 328') facing the impeller to the horizontal plane is L3, then L2 is less than L3.

9. The centrifugal pump with integrated electric heating component according to claim 8, characterized in that: The distance from the top of the first water outlet (121) to the horizontal plane is L1, and L1 is greater than L3.

10. Guide block The guide block is a centrifugal pump with an integrated electric heating component according to claim 5, characterized in that: The electric heating tube (110) comprises a tubular heating portion (111) surrounding a heating chamber, and in a projection of an axial cross section, a distance H1 from an axial end surface of the guide block (127, 127') facing the base (130, 130') to a horizontal plane is less than or equal to a distance H2 from any point on a contour line of the heating portion (111) to a horizontal plane.

11. The centrifugal pump with integrated electric heating component according to claim 10, characterized in that: The outer surface of the isolation portion (120, 120') is located axially above the guide block (127, 127') and is also provided with a plurality of guide blocks (123, 123').

12. The centrifugal pump with integrated electric heating component according to claim 11, characterized in that: The outer surface of the isolation portion (120, 120') is also provided with a separation block (124, 124') formed by radially raised ribs for separating the first water outlet (121, 121') or the first notch (129).

13. The centrifugal pump with integrated electric heating component according to claim 12, characterized in that: The guide block (123, 123') comprises a first guide block (11, 11') close to the guide block (127, 127') and a second guide block (12, 12') close to the end surface of the pump cover, and the partition block (124, 124') comprises a first partition block (15, 15') with one end extending to the base and the other end connected to the guide block (127, 127') and a second partition block (16, 16') with one end extending to the upper end of the base and the other end connected to the second guide block (12, 12').

14. The centrifugal pump with integrated electric heating component according to claim 13, characterized in that: The radial outer surface of the isolation portion (120, 120') also protrudes a first convex rib (17, 17') for connecting the first guide block (11, 11') and the first water outlet (121, 121').

15. The centrifugal pump with integrated electric heating component according to claim 10, characterized in that: The electric heating pipe (110) further comprises a first external connection portion (112) connected to one end of the heating portion (111) and a second external connection portion (113) located radially outside the heating portion (111) and connected to the heating portion (111); the radial surface protrusions of the isolation portion (120, 120′) wrap around the second external connection portion (113) to form a fifth guide block (18, 18′); and a partition space is provided circumferentially between the fifth guide block (18, 18′) and the guide block (123, 123′).

16. The centrifugal pump with integrated electric heating component according to claim 15, characterized in that: The isolation portion (120, 120') is located on the radial surface of the other side of the fifth guide block (18, 18') in the circumferential direction to form a sixth guide block (19, 19'), and the fifth guide block (18, 18') and the sixth guide block (19, 19') are not connected to each other in the circumferential direction.

17. The centrifugal pump with integrated electric heating component according to claim 16, characterized in that: The included angle γ between the fifth guide block (18, 18') and the horizontal plane is an acute angle.

18. The centrifugal pump with integrated electric heating component according to claim 2 or 4, characterized in that: The pump cover (400) is a cylindrical body having an end surface (410) at one end and being open at the other end. The lower side of the end surface (410) is axially concave to form a water outlet groove (412) with a water outlet (411). The outer surface of the isolation part (120, 120') has radially protruding ribs to form a blocking block (122, 122'). The blocking block (122, 122') extends axially from the top end of the isolation part to the bottom end.

19. The centrifugal pump with integrated electric heating component according to claim 18, characterized in that: The included angle α between the extension direction of the blocking block (122, 122') and the end surface of the base (130, 130') is greater than or equal to 90°.

20. The centrifugal pump with integrated electric heating component according to claim 18, characterized in that: The first water outlet (121, 121') and the first notch (129, 129') are located on one circumferential side of the blocking block (122, 122'), and the water outlet groove (412) is located on the other circumferential side of the blocking block (122, 122').

21. The centrifugal pump with integrated electric heating component according to claim 20, characterized in that: The radial surface of the isolation portion (120, 120') is radially protruded in the area between the end of each guide block and the blocking block (122, 122') to form a columnar heat-conducting column (125, 125').

22. The centrifugal pump with integrated electric heating component according to claim 1, characterized in that: The inner surface of the isolation part (120, 120') is radially concave or convex to form a heat conducting part (128, 128') extending from the top end to the bottom end of the isolation part.

23. The centrifugal pump with integrated electric heating component according to claim 1, characterized in that: The water-proof shell (320) is formed by integral injection molding based on the stator part (310), and comprises a cylindrical inner shell part (321) with an opening at one end covering the arc surface of the iron core (311) of the stator part, an upper end part (322) extending radially outward from the outer edge of the opening of the inner shell part, a lower end part (323) extending outward from the side of the inner shell part away from the opening, and an outer shell part (324) connecting the upper and lower ends. The stator part (310) is wrapped in a stator cavity (4) surrounded by the inner and outer shell parts and the upper and lower ends.

24. The centrifugal pump with integrated electric heating component according to claim 1, characterized in that: The waterproof shell (320') is an independent injection molded part, including an inner shell part (321') having a hollow chamber, an outer shell part (323') located radially outside the inner shell part, and an upper end part (322') connecting the two. The stator part (310) is installed in a stator cavity (4') surrounded by the inner shell part, the outer shell part and the upper end part.

25. The centrifugal pump with integrated electric heating component according to claim 23 or 24, characterized in that: The water-proof shell (320, 320') also includes an annular rim portion (326, 326') located at the upper end portion (322, 322') and spiral guide ribs (327, 327') protruding from the radial outer surface of the outer shell portion (324, 323'), and the water outlet includes a notch (325, 325') arranged on the rim portion (326, 326').

26. The centrifugal pump with integrated electric heating component according to claim 25, characterized in that: One end of the guide rib (327, 327') is connected to the notch (325, 325'), and the other end extends to the bottom end of the water-blocking shell (320, 320'). In the assembled state, the notch (325, 325') and the water outlet are respectively located on both sides of the circumference of the guide rib (327, 327').

27. The centrifugal pump with integrated electric heating component according to claim 25, characterized in that: The pump cover (400) is concave toward the axial surface of the rotor assembly to form a concave portion (420); the axial end surface of the concave portion (420) protrudes a water guide block (421) with a pump cover notch (422); the water passage includes the pump cover notch (422), and the pump cover notch (422) is correspondingly connected to the notch (325, 325′); the area of ​​the axial cross section of the water guide block (421) gradually decreases along the rotation direction of the rotor assembly, and in the projection view of the same plane perpendicular to the axis, the projection of the water guide block (421) is located within the projection of the surrounding edge portion (326).

Images