Heating pump with plastic package stator assembly

Abstract

A heating pump with a plastic package stator assembly comprises a rotor, the plastic package stator assembly, a base, a pump cover and an electric heating assembly, an impeller is fixed at one end of the rotor, the plastic package stator assembly is arranged in the center of the base and comprises a waterproof shell, and the waterproof shell is provided with an inner shell portion, an outer shell portion, an upper end portion and a lower end portion. The coil assembly is wrapped in a stator cavity defined by the inner shell part, the outer shell part, the upper end part and the lower end part, an impeller cavity for containing the impeller is defined by the upper end part and the axial space of the pump cover, a heating cavity for containing the electric heating assembly is defined by the outer shell part, the pump cover and the base, and a water passing opening communicated with the impeller cavity and the heating cavity is formed in the waterproof shell and / or the pump cover. According to the heating pump with the plastic package stator assembly, the water insulation shell is arranged on the coil assembly in an injection molding mode to form the integrated plastic package stator assembly, the upper end portion and the outer shell portion of the plastic package stator assembly, the pump cover, the electric heating assembly and the base can form a cavity for liquid flowing and heating, the production process is simplified, and the production efficiency is improved. And the production efficiency of the heating pump is improved.

Description

Technical Field

[0001] The invention relates to a heating pump with a plastic-sealed stator assembly, and its IPC classification number is F04D 13 / 06. Background Art

[0002] The existing pump with heating function is shown in the patent publication number CN114060288A. The pump includes a heating component body, a rotor, a pump cover, an inner water-blocking sleeve, a stator and a pump body, etc. The heater body includes an inner peripheral flow channel sleeve. The inner water-blocking sleeve is usually installed with an O-ring and axially sleeved in the inner peripheral flow channel sleeve to enclose a stator cavity. Because the inner water-blocking sleeve and the inner peripheral flow channel sleeve are flexibly connected through an O-ring, in order to prevent the inner water-blocking sleeve from moving due to vibration during operation, epoxy resin is usually poured into the stator cavity. The above-mentioned heating pump requires a large number of parts to form a flow channel, the installation process is complicated, and the curing of the epoxy resin takes a long time (curing at room temperature requires 24 hours or more), resulting in low production efficiency of the product.

[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 heating pumps", the machinery industry standard JB / T5415 "Micro heating electric pumps", the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by the Machinery Industry Press in 1983 or 1997, the "Pump Theory and Technology" published by the Machinery Industry Press in 2014, the "Modern Pump Theory and Technology" published by the China Aerospace Press in 2011, the "Pumps and Fans" published by the China Electric Power Press in 2008, and the 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 heating pump with a plastic-sealed stator assembly comprises a rotor with an impeller fixed at one end, the plastic-sealed stator assembly, a base, a pump cover arranged on the base and an electric heating assembly fixed on the base, wherein the plastic-sealed stator assembly is arranged in the center of the base and is characterized in that: the plastic-sealed stator assembly comprises a coil assembly and a water-proof shell injection-molded thereon, the water-proof shell comprises a cylindrical inner shell portion for mounting the rotor, an upper end portion radially extending outward from the outer edge of the opening of the inner shell portion, a lower end portion extending outward from the side of the inner shell portion away from the opening and an outer shell portion connecting the upper and lower ends, the coil assembly is wrapped in a stator cavity surrounded by the inner and outer shell portions and the upper and lower ends, the axial space between the upper end portion and the pump cover forms an impeller cavity for accommodating the impeller, the outer shell portion, the pump cover and the base form a heating cavity, the electric heating assembly is accommodated in the heating cavity and is located radially outside the plastic-sealed stator assembly, and a water inlet connecting the impeller cavity and the heating cavity is provided on the water-proof shell and / or the pump cover.

[0006] The heating pump with a plastic-sealed stator assembly of the present invention forms an integrated plastic-sealed stator assembly by injection molding a water-proof shell onto a coil assembly. The plastic-sealed stator assembly is fixed on a base, and its upper end portion and outer shell portion together with a pump cover, an electric heating assembly, and a base can form a cavity for liquid flow and heating. The assembly of parts and the production process are simplified, which is beneficial to improving the production efficiency of the heating pump.

[0007] Furthermore, the upper end portion has an axially protruding annular peripheral edge portion, and the water outlet includes a notch arranged on the peripheral edge portion.

[0008] Furthermore, a spiral guide rib protrudes from the radial outer surface of the outer shell, 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 the notch and the water outlet are respectively located on both sides of the circumference of the guide rib.

[0009] Furthermore, the axial surface of the pump cover facing the rotor is concave 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 corresponding notch.

[0010] Furthermore, the area of ​​the axial cross section of the water guide block gradually decreases along the rotation direction of the rotor, 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.

[0011] Furthermore, the electric heating component divides the heating chamber into an inner peripheral flow channel located radially inward and an outer peripheral flow channel located radially outward, and a water outlet connecting the inner peripheral flow channel and the outer peripheral flow channel is provided radially.

[0012] Furthermore, the stator also includes an annular inner water-blocking sleeve mounted on the water-blocking shell, the axial end face of the inner water-blocking sleeve protruding inner water-blocking sleeve edge, the radial outer surface of the inner water-blocking sleeve protruding spiral inner water-blocking sleeve guide ribs, the water outlet includes an inner water-blocking sleeve notch arranged on the inner water-blocking sleeve edge, and the inner water-blocking sleeve guide ribs separate the inner peripheral flow channel along the circumferential direction.

[0013] Furthermore, the electric heating component includes an electric heating tube and an isolation shell. The isolation shell is a hollow cylindrical body that wraps the electric heating tube and is cast integrally with the base on the electric heating tube. The water outlet includes a first water outlet and / or a first notch radially opened on the columnar periphery of the isolation shell.

[0014] Furthermore, the electric heating component includes an electric heating tube, a second sealing ring and a hollow cylindrical isolation shell cast on the electric heating tube and wrapping it, the isolation shell and the base are detachably fixedly connected, and the second sealing ring is arranged axially between the isolation shell and the base, and the water outlet includes a first water outlet and / or a first notch radially opened on the cylindrical outer periphery of the isolation shell.

[0015] Furthermore, a fan-shaped guide block formed by raised ribs is provided on the outer surface of the isolation shell.

[0016] Furthermore, the isolation shell is located in the axial space between the guide block and the base and is also provided with an axial opening which radially penetrates the inner peripheral flow channel and the outer peripheral flow channel.

[0017] Furthermore, a fourth guide block is provided directly above the axial opening.

[0018] 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 axial 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.

[0019] Furthermore, if the distance from the top of the first water outlet to the horizontal plane is L1, then L1 is greater than L3.

[0020] Furthermore, the plastic-sealed stator assembly also includes a first water guide sleeve in the shape of an annulus column which is axially mounted on the water-blocking shell and close to the impeller, and a second water guide sleeve in the shape of a fan-shaped annulus column which is located below the first water guide sleeve and is mounted on the water-blocking shell. The axial end face of the first water guide sleeve protrudes from the first water guide sleeve edge, and the other axial side thereof extends out from a water guide portion which is inserted into the opening of the second water guide sleeve. The radial outer surface protrusion of the first water guide sleeve is located on a spiral first guide rib on the water guide portion, and the water outlet includes a first water guide sleeve notch which is arranged on the edge of the first water guide sleeve, and the first guide rib separates the inner flow channel along the circumferential direction.

[0021] Furthermore, the first water guide sleeve is axially welded to the watertight shell.

[0022] Furthermore, a water inlet hole is provided on the axial end face of the first water guide sleeve, a water guide notch is provided on the side of the water guide sleeve axially adjacent to the base, the inner diameter of the first water guide sleeve is equal to the inner diameter of the second water guide sleeve, and after the first water guide sleeve and the second water guide sleeve are assembled on the water-blocking shell, a cooling flow channel for liquid to pass through is formed radially therebetween.

[0023] Furthermore, the radial outer surface of the second water guide jacket has a raised flange portion at the end away from the impeller, the outer edge of the flange portion is turned up as a rim portion, the distance from the top of the axial opening to the horizontal plane is L2, and the distance from the end surface of the rim portion facing the impeller to the horizontal plane is L4, then L2 is less than L4.

[0024] 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 base is less than or equal to the distance H2 from any point on the contour line of the heating portion to the base.

[0025] Furthermore, a plurality of guide blocks are provided on the outer surface of the isolation shell axially above the guide block.

[0026] Furthermore, the outer surface of the isolation shell is also provided with a dividing block formed by radially raised ribs for dividing the first water outlet or the first notch.

[0027] Furthermore, the guide block includes a first guide block close to the guide block, a second guide block close to the end face of the pump cover and a third guide block arranged therebetween, and the dividing block includes a first dividing block whose one end extends to the base and the other end is connected to the guide block, and a second dividing block whose one end extends to the upper end of the base and the other end is connected to the second guide block.

[0028] 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 shell has radially raised ribs to form a baffle block, which extends axially from the top of the isolation shell to the bottom.

[0029] Furthermore, the 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°.

[0030] 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.

[0031] Furthermore, the radial surface of the isolation shell protrudes radially in the area between the end of each guide block and the blocking block to form a columnar heat-conducting column.

[0032] Furthermore, the inner surface of the isolation shell is radially concave or convex to form a heat conducting portion extending from the top end to the bottom end of the isolation shell.

[0033] Furthermore, the heating pump with a plastic-sealed stator assembly also includes a bearing seat axially arranged between the impeller and the plastic-sealed stator assembly, a groove is provided on the end surface of the bearing seat facing away from the plastic-sealed stator assembly, and a convex rib portion protrudes from the axial end surface of the impeller facing the bearing seat and extends into the groove.

[0034] 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

[0035] Figure 1 It is a three-dimensional structural schematic diagram of the heating pump of the present invention;

[0036] Figure 2 It is a schematic diagram of the exploded structure of the heating pump of the present invention;

[0037] Figure 3 is an axial cross-sectional view of the heating pump of the present invention at the cutting plane A;

[0038] Figure 4 is an axial cross-sectional view of the heating pump of the present invention at cutting plane B;

[0039] Figure 5 It is a three-dimensional structural schematic diagram of the plastic-sealed stator assembly of the present invention;

[0040] Figure 6 is an axial cross-sectional view of the plastic-sealed stator assembly of the present invention;

[0041] Figure 7 It is a schematic diagram of the three-dimensional structure of the heating part of the present invention;

[0042] Figure 8 is a front view of a heating portion of the present invention;

[0043] Fig. 9 It is a schematic diagram of the three-dimensional structure of the electric heating tube of the present invention;

[0044] Fig.10 It is a three-dimensional structural schematic diagram of a heating part provided with a notch according to the present invention;

[0045] Fig.11 It is a three-dimensional structural schematic diagram of the pump cover of the present invention;

[0046] Fig.12 is a radial cross-sectional view of a heating pump of the present invention;

[0047] Fig.13 It is a schematic diagram of the flow trajectory of the heating pump of the present invention in the inner peripheral flow channel;

[0048] Fig.14 It is a schematic diagram of the flow trajectory of the heating pump of the present invention in the peripheral flow channel;

[0049] Fig.15 It is a schematic diagram of the exploded structure of the plastic-sealed stator assembly and the inner water-isolating sleeve of the second embodiment of the present invention;

[0050] Fig.16 is an axial cross-sectional view of a second embodiment of a heat pump of the present invention;

[0051] Fig.17 is a schematic diagram of the exploded structure of the second embodiment of the heating unit of the present invention;

[0052] Fig.18 is an axial cross-sectional view of a second embodiment of a heating portion of the present invention;

[0053] Fig.19 is an axial cross-sectional view of a third embodiment of a heating pump of the present invention;

[0054] Fig. 20 It is a schematic diagram of the exploded structure of the first water guide sleeve, the second water guide sleeve and the water barrier shell before installation of the present invention;

[0055] Fig.21is an axial cross-sectional view of the rotor of the present invention after being installed on the plastic-sealed stator assembly;

[0056] Fig. 22 is an axial cross-sectional view of a fourth embodiment of a heating 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 cavity, 3′-electrical cavity, 4-stator cavity, 4′-stator cavity, 5-heating cavity, 5-heating cavity′, 6-impeller cavity, 6′-impeller cavity, 7″-cooling flow channel, 10-heating part, 10′-heating part, 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, 21-lower outer flow channel, 21′-lower Peripheral flow channel, 21″-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-external part, 120-isolation shell, 120′-isolation shell, 121-first water outlet, 121′-first water outlet, 122-blocking block, 122′-blocking block, 123-guide block, 123′-guide block, 124-dividing block, 124′-dividing block, 125-heat-conducting column, 125′-heat-conducting column, 130-base, 130′-base, 131-bottom ring, 131′-bottom ring, 132-inner ring, 126-axial opening, 126′-axial opening, 127-guide block, 127′-guide block, 128-heat conducting part, 128′-heat conducting part, 129-first notch, 130-base, 130′-base, 130″-base, 131-bottom ring, 131′-bottom ring, 200-rotor, 210-rotating shaft, 220-main body, 230-impeller, 231-convex rib, 240-permanent magnet, 300-plastic encapsulated stator assembly, 300′-plastic encapsulated stator assembly, 300″-plastic encapsulated stator assembly, 310-coil assembly, 311-iron core, 312-skeleton, 313-enameled wire, 320-waterproof shell, 320′-waterproof shell, 320″-waterproof shell, 321-inner shell, 321′-inner shell, 321″-inner shell, 32 2-upper end, 322′-upper end, 322″-upper end, 323-lower end, 323′-lower end, 323″-lower end, 324-shell, 324′-shell, 324″-shell, 325-notch, 326-edge, 327-guiding rib, 328-water retaining part, 328′-water retaining part, 330′-inner water barrier, 330″-first water guide, 331′-inner water barrier notch, 331″-first water guide notch, 332′-inner water barrier edge, 332″-first water guide edge, 333′-inner water barrier guiding rib, 333″-water guide, 334′-body, 334″-first guiding rib, 335″-water inlet, 336″-water guide notch,340″-second water guide sleeve, 341″-flange, 342″-edge, 400-pump cover, 410-pump cover end face, 411-water outlet, 412-water outlet groove, 420-drain groove, 421-water guide block, 422-pump cover notch, 430-water inlet pipe, 440-drain pipe, 720-second sealing ring, 730-screw, 800-bearing seat, 810-groove, 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 heating pump having a plastic-sealed stator assembly. Figures 1 to 3 The heating pump includes a heating part 10, a rotor 200 with an impeller 230 at one end, a plastic-encapsulated stator assembly 300 fixed to the heating part 10, a pump cover 400 connected to the heating part 10, and a rotating shaft 210 fixed to the plastic-encapsulated stator assembly 300 and for the rotor 200 to be sleeved.

[0062] See Figures 2 to 7The heating part 10 includes a base 130 and an electric heating component 100 fixedly connected thereto; the rotor 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 plastic-encapsulated stator assembly 300 includes a coil assembly 310 and a waterproof shell 320 injection-molded thereon, wherein the coil assembly 310 includes an iron core 311, a skeleton 312 fixed to the iron core, and an enameled wire 313 wound on the skeleton 312, and the waterproof shell 320 includes a cylindrical inner shell 321, an outer edge of an opening of the inner shell 321, and a An upper end portion 322 extending radially outward, a lower end portion 323 extending outward from the inner shell portion away from the opening, an outer shell portion 324 connecting the upper and lower ends, and an annular water retaining portion 328 protruding radially outward from the outer surface of the outer shell portion 324, the coil assembly 310 is wrapped in the stator cavity 4 surrounded by the inner shell portion 321, the outer shell portion 324, the upper end portion 322, and the lower end portion 323; the pump cover 400 is a cylindrical body with one end open, and the other end has an end face 410, the center of the end face 410 is provided with a water inlet pipe 430 for water supply, and the periphery of the cylindrical body is provided with a drain pipe 440 for drainage. The pump cover 400 and / or the water-proof shell 320 of the present invention are provided with a water inlet. During installation, the plastic-encapsulated stator assembly 300 is arranged at the upper end of the base 130 and is located radially inward of the electric heating assembly 100. The rotor 200 can be rotatably installed on the plastic-encapsulated stator assembly 300 provided with a rotating shaft 210. The pump cover 400 and the base 130 are covered together to form a heating chamber 5 surrounding the plastic-encapsulated stator assembly 300, preferably fixed with screws. After the installation is completed, the electric heating assembly 100 of the heating part 10 is located between the outer wall surface of the outer shell part 324 of the plastic-encapsulated stator assembly 300 and the inner circumferential wall of the pump cover 400. The pump cover 400 and the plastic-encapsulated stator assembly 300 are axially surrounded to form 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, and the water inlet connects the heating chamber 5 and the impeller chamber 6.

[0063] Embodiment 1:

[0064] like Figures 3 to 5The outer edge of the upper end 322 of the water-proof shell 320 of the present invention also axially protrudes an annular rim portion 326, and the water outlet includes a notch 325 arranged on the rim portion 326. During operation, the liquid in the impeller chamber 6 flows into the heating chamber 5 from the notch 325 under the push of the impeller 230. This design can enhance the enclosure effect of the impeller chamber by the cooperation between the rim portion and the pump cover, thereby improving the drainage efficiency. Furthermore, the radial outer surface of the outer shell 324 of the water-proof shell 320 protrudes with a spiral guide rib 327, the upper end of the guide rib 327 is connected to the notch 325 of the rim portion, and the other end extends to the bottom end of the water-proof shell 320. After the heating pump is assembled, the guide rib 327 separates the notch 325 on one side of the circumference near the guide rib 327, and separates the water outlet that radially passes through the inner peripheral flow channel 1 and the outer peripheral flow channel 2 on the other side of the circumference near the guide rib 327. Among them, the definition of close to the guide rib is that in the axial projection of the heating pump, the angle formed by the line segment OA formed by the line connecting the axis O of the heating pump and any point A on the contour line of the notch and the line segment OB formed by the line connecting the axis O of the heating pump and any point B on the contour line of the guide rib is an acute angle; similarly, the angle formed by the line segment formed by the line connecting the axis of the heating pump and any point on the contour line of the water outlet and the line segment formed by the line connecting the axis of the heating pump and any point on the contour line of the guide rib is an acute angle. This design allows the liquid entering the inner peripheral flow channel 1 to rotate around the radial outer surface of the waterproof shell 320 for one circle before entering the outer peripheral flow channel 2, increasing the heat conduction time between the liquid and the electric heating tube, and improving the heating efficiency of the heating pump.

[0065] See Figure 3 , Fig.11 and Fig.12 , in order to further reduce the loss of kinetic energy when the liquid flows, and further improve the drainage efficiency of the heating pump. The pump cover 400 sinks axially toward the end face 410 of the rotor to form a concave portion 420, and the axial end face of the concave portion 420 protrudes a water guide block 421, 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 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 direction of rotation of the rotor, 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 outline of 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 face of the rotor, and the pump cover water retaining rib and the radial direction of the stator form a cavity for accommodating the impeller, which can also achieve the above effect.

[0066] See Figures 7 to 10The electric heating component 100 of the present invention includes an electric heating tube 110 and an isolation shell 120, wherein the isolation shell 120 and the base 130 are formed by integral casting, preferably cast with cast aluminum material. The isolation shell 120 of the present invention is a hollow columnar body with an open end in the axial direction and the other end connected to the base 130 in the axial direction, and a water outlet is provided radially through the columnar body. After the casting is completed, the electric heating tube 110 is wrapped in the hollow columnar isolation shell 120 (only the terminal part is exposed). See Figure 3 and Figure 7 After the heating pump is assembled, the isolation shell 120 located between the outer wall surface of the shell portion 324 of the plastic-sealed stator assembly 300 and the inner circumferential wall of the pump cover 400 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 isolation shell 120 near the base 130 to radially penetrate the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation. The first water outlet 121 may be a through hole opened radially in the isolation shell 120. In other embodiments, the water outlet may also be a through hole provided at other positions on the outer circumferential surface of the isolation shell 120 to radially penetrate the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation, or even as Fig. 9 As shown, a first notch 129 is provided on the isolation shell 120 to radially penetrate the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation. The heating pump of the present invention adopts an integrated casting process to integrate the electric heating pipe 110, the isolation shell 120 and the base 130. 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 heating pump.

[0067] Preferably, see Figure 2 and Figure 3 The heating 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 on the heating pump, which is convenient for regulating the temperature of the instant hot liquid.

[0068] See Figure 3 and Figure 4 The outer surface of the isolation shell 120 is provided with a fan-shaped guide block 127 formed by raised ribs. Preferably, the guide block 127 separates the peripheral flow channel 2 into a lower peripheral flow channel 21 close to the side of the base 130 and an upper peripheral flow channel 22 located axially above the lower peripheral flow channel 21. This design allows the circuit board located at the lower end of the base to dissipate heat through the liquid with a lower temperature, thereby improving the heat dissipation effect of the circuit board. Of course, as other embodiments, the guide block 127 can be a rib raised in the peripheral flow channel 2 to play a guiding role, and it is not necessary to separate the peripheral flow channel 2.

[0069] Further, see Figure 3 , Figure 4 and Figure 8 In order to reduce the heat transfer to the base 130 and affect the operation of the circuit elements located on the axial side of the base 130, the isolation shell 120 is located in the axial space between the guide block 127 and the base 130. It is also provided with an axial opening 126 that radially penetrates the inner peripheral flow channel 1 and the outer peripheral flow channel 2. Preferably, in order to reduce the heat transfer from the isolation shell 120 to the base 130, a fourth guide block 14 is also provided directly above the axial opening 126. Preferably, in order to prevent the liquid in the inner peripheral flow channel 1 from passing through the axial opening 126 and entering the lower peripheral flow channel 22 to affect the displacement of the heating pump, the heating pump is placed in a vertical state (the axis of the heating pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the heating pump, the distance from the top of the axial opening 126 of the isolation shell of the present invention to the horizontal plane 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 flow into the outer peripheral flow channel 2 more smoothly, the distance from the top of the first water outlet 121 to the horizontal plane is L1, and L1 is greater than L3.

[0070] See Figure 3 and Fig. 9 The electric heating pipe 110 includes a tubular heating portion 111 surrounding the heating chamber 5 and an external connection portion 112 connected to the heating portion 111 and extending axially outward. In order to further reduce the heat transfer of the electric heating pipe 110 to the lower peripheral flow channel 21, the heating pump is placed in a vertical state (the axis of the heating pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the heating pump, the distance H1 from the axial end surface 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.

[0071] See Figure 7 In order to increase the contact area between the liquid and the isolation shell 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 shell 120 is further provided with several guide blocks 123 located above the axial direction of the guide block 127. Figure 3 and Figure 7, the outer surface of the isolation shell 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 between the two, 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 heating 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 shell is also provided with a guide block 123 and a partition block 124.

[0072] Preferably, see Figure 3 , Figure 7 and Fig.11 The radial outer surface of the isolation shell 120 of the electric heating component 100 protrudes a rib-shaped blocking block 122 extending axially from the top of the isolation shell 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. 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 heating pump is assembled, the baffle block 122 of the isolation shell 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 groove 412 on the other side of the circumference close to the baffle block 122. The definition of close to the baffle block is that in the axial projection of the heating pump, the angle formed by the line segment formed by the axis of the heating pump and the points on the contour line of the first water outlet 121 and the line segment formed by the axis of the heating pump and the points on the contour line of the baffle block 122 on the same side is an acute angle; the angle formed by the line segment formed by the axis of the heating pump and the points on the contour line of the water outlet groove 412 and the line segment formed by the axis of the heating pump and the contour line of the baffle block 122 on the same side is an acute angle. 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 heat pump. Figure 8 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°.

[0073] Preferably, see Figure 3 and Figure 7In 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 shell 120 in the area between the end of the guide block and the baffle block 122 .

[0074] Preferably, see Figure 7 In order to increase the heat transfer area of ​​the liquid in the inner peripheral flow channel and improve the heating efficiency of the heat pump, the radial inner surface of the isolation shell 120 is provided with a heat conducting portion 128 formed by an axially extending radial concave portion. Of course, as another embodiment, the radial inner surface of the isolation shell 120 is provided with a heat conducting portion formed by an axially extending radial protrusion, which can also achieve the purpose of increasing the heat transfer area of ​​the liquid in the peripheral flow channel.

[0075] The working principle of the heat pump of the present invention is shown in Figure 3 and Figure 12 to Figure 14 When the heat 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 in the circumferential direction 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 at the blocking block 122 from the first water outlet 121 (i.e., b1). The axial lower side of the spacer 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 of the baffle block 122 (i.e. b3), and the other part of the liquid enters the lower peripheral flow channel 21, and 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 of the baffle block 122 (i.e. b5); 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 heating 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 for heat conduction, and has high heating efficiency. In addition, 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 difference between the heating pump of this embodiment and the heating pump of embodiment 1 is that the structure of the plastic-encapsulated stator assembly 300' is different, and the heating pump also includes an inner water-proof sleeve 330'. In addition, the other structures are the same as those of embodiment 1. Fig.13 and Fig.14The plastic-sealed stator assembly 300′ of this embodiment includes a coil assembly 310 and a waterproof shell 320′ injection-molded thereon, wherein the structure of the coil assembly 310 is the same as that of Example 1, and the waterproof shell 320′ includes a cylindrical inner shell portion 321′, an upper end portion 322′ radially extending outward from the outer edge of the opening of the inner shell portion 321′, a lower end portion 323′ extending outward from the side of the inner shell portion away from the opening, and an outer shell portion 324′ connecting the upper and lower ends, and the coil assembly 310 is wrapped in a stator cavity 4′ surrounded by the inner and outer shell portions and the upper and lower ends. The inner water-blocking shell 320′ is an annular column with open ends, which is sleeved on the plastic-sealed stator assembly 300′, including an annular main body 334′, an inner water-blocking sleeve edge 332′ protruding on the axial end face of the main body 334′, and spiral inner water-blocking sleeve flow guide ribs 333′ protruding on the radial outer surface of the main body 334′. The water outlet includes an inner water-blocking sleeve notch 331′ arranged on the inner water-blocking sleeve edge 332′. After the heating pump is assembled, the inner water-blocking sleeve flow guide ribs 333′ separate the inner peripheral flow channel 1′ along the circumferential direction. The cross-sectional view of the heating pump assembly structure of this embodiment is shown in FIG. Fig.15 The working principle is the same as that of the first embodiment, which will not be described in detail here. The heating pump of this embodiment can reduce the thickness of the outer shell of the water-proof shell, and solve the problem of product qualification rate caused by shrinkage of the water-proof shell during production.

[0078] Embodiment 3:

[0079] The difference between the heating pump of this embodiment and the heating pump of embodiment 1 is that the structure of the heating part 10' is different, and the main difference is the connection structure between the electric heating component 100' and the base 130'. Fig.16 and Fig.17 The electric heating component 100′ includes an electric heating tube 110, an isolation shell 120′ integrally cast with the electric heating tube 110, and a base 130′ which is a disc-shaped body. The heating portion 10′ of this embodiment is the electric heating component 110′ fixed to the base 130′ by screws, snaps or other commonly used connection processes in the "Mechanical Engineering Handbook", and a first water outlet 121′ is provided at the lower end of the isolation shell 120′. In order to improve the sealing between the electric heating component 110′ and the base 130′, the heating portion 10′ also includes a second sealing ring 720, which is arranged between the base 130′ and the electric heating component 110′ in the axial direction. The assembly structure of the heating pump of this embodiment is shown in FIG. Fig.18 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 heat pump of this embodiment burns out, the electric heating assembly 100' cast with the electric heating tube can be disassembled and replaced, which is conducive to reducing maintenance costs.

[0080] Embodiment 4:

[0081] The difference between the heating pump of this embodiment and the heating pump of embodiment 1 is that the structure of the plastic-encapsulated stator assembly 300" is different. In addition, the other structures are the same as those of embodiment 1. Figure 20 to Figure 22 The plastic-encapsulated stator assembly 300″ in this embodiment also includes a first water guide sleeve 330″ in the shape of an annular column which is sleeved on the water-blocking shell 320″ axially close to the impeller 230 side, and a second water guide sleeve 340″ in the shape of a fan-shaped annular column which is located below the first water guide sleeve and sleeved on the water-blocking shell 320″. The axial end face of the first water guide sleeve 330″ protrudes a first water guide sleeve edge 332″, and the other axial side thereof extends out a water guide portion 333″ which is inserted into the opening of the second water guide sleeve 340″. The radial outer surface of the first water guide sleeve 330″ protrudes a portion of the water-blocking shell 320″ and is located on the water guide portion 333″ in the shape of a spiral first flow guide rib 334″. The water outlet includes a first water guide sleeve notch 331″ arranged on the first water guide sleeve edge 332″, and the first flow guide rib 334″ divides the inner peripheral flow channel 1 circumferentially. This design can further optimize the mold structure for producing plastic-encapsulated stator assemblies, and improve the qualified rate of plastic-encapsulated stator assemblies. Furthermore, in order to increase the connection strength between the first guide ribs 334 ″ and the first guide ribs 334 ″, the first water guide sleeve 330 ″ of the present invention is axially welded to the water-blocking shell 320 ″.

[0082] See Fig.21 The axial end face of the first water guide sleeve 330" of the present invention is provided with a water inlet hole 335", and the side of the water guide portion 333" axially adjacent to the base 130" is provided with a water guide portion notch 336". Furthermore, the inner diameter of the first water guide sleeve 330" is equal to the inner diameter of the second water guide sleeve 330", and after the first water guide sleeve 330" and the second water guide sleeve (330") are assembled in the waterproof shell 320", a cooling channel 7" for liquid to pass through is formed between them in the radial direction. The above design can cool and dissipate the parts in the waterproof shell of the plastic-sealed stator assembly, thereby improving the working stability of the heating pump.

[0083] Preferably, see Fig. 20 In order to increase the displacement of the heating pump, the radial outer surface of the second water guide sleeve 340" of the present invention is provided with a flange portion 341" at the end away from the impeller, and the outer edge of the flange portion 341" is turned up with a rim portion 342". The heating pump is placed vertically (the axis of the heating pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the heating pump, it can be seen that Fig. 22 The heating pump of the present invention is placed vertically (the axis of the heating pump is perpendicular to the horizontal plane), and in the projection of the same axial section of the heating pump, the distance from the top of the axial opening 126 to the horizontal plane is L2, and the distance from the end surface of the edge portion 342″ facing the impeller to the horizontal plane is L4, then L2 is less than L4.

[0084] Preferably, see Fig.21 and 22In order to reduce the damage to the rotor 200 caused by the entry of external debris into the inner shell 321", the heating pump with a plastic-sealed stator assembly of the present invention also includes a bearing seat 800 axially arranged between the impeller 230 and the plastic-sealed stator assembly 300". The bearing seat 800 is provided with a groove 810 on the end surface on the side facing away from the plastic-sealed stator assembly 300", and the axial end surface of the impeller 230 on the side facing the bearing seat 800 protrudes into the rib portion 231 of the groove 810.

[0085] 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 heating pump with a plastic-encapsulated stator assembly, comprising a rotor (200) with an impeller (230) fixed at one end, a plastic-encapsulated stator assembly (300, 300', 300", a base (130, 130'), a pump cover (400) arranged on the base (130, 130'), and an electric heating assembly (100, 100') fixed on the base (130, 130'), wherein the plastic-encapsulated stator assembly (300, 300', 300") is arranged at the center of the base (130, 130'), and characterized in that: The plastic-sealed stator assembly (300, 300', 300") comprises a coil assembly (310, 310') and a waterproof shell (320, 320', 320") injection-molded thereon, the waterproof shell (320, 320', 320") comprising a cylindrical inner shell portion (321, 321', 321") for mounting the rotor (200), an upper end portion (322, 322', 322") extending radially outward from the outer edge of the opening of the inner shell portion (321, 321', 321"), a lower end portion (323, 323', 323") extending outward from a side of the inner shell portion away from the opening, and an outer shell portion (324, 324', 324") connecting the upper and lower ends, the coil assembly being wrapped around the inner and outer shell portions and the upper and lower ends. The stator cavity (4, 4') surrounded by the upper end (322, 322', 322") and the pump cover (400) is in the stator cavity (4, 4') surrounded by the upper end (322, 322', 322"), the axial space between the upper end (322, 322', 322") and the pump cover (400) surrounds an impeller cavity (6, 6', 6") for accommodating an impeller, the outer shell (324, 324', 324"), the pump cover (400) and the base (130, 130') surround a heating cavity (5, 5', 5"), the electric heating component (100, 100') is accommodated in the heating cavity (5, 5', 5") and is located radially outside the plastic-sealed stator component (300, 300', 300"), and a water through hole connecting the impeller cavity (6, 6', 6") and the heating cavity (5, 5', 5") is provided on the water-proof shell (320, 320', 320") and / or the pump cover (400).

2. The heating pump with a plastic-sealed stator assembly according to claim 1, characterized in that: The upper end portion (322) has an axially protruding annular peripheral edge portion (326), and the water passage includes a notch (325) arranged on the peripheral edge portion (326).

3. The heating pump with a plastic-sealed stator assembly according to claim 2, characterized in that: A spiral guide rib (327) protrudes from the radial outer surface of the outer shell (324), one end of the guide rib (327) is connected to the notch (325), and the other end extends to the bottom end of the water-blocking shell (320), and the notch (325) and the water outlet are respectively located on both sides of the circumference of the guide rib (327).

4. The heating pump with a plastic-sealed stator assembly according to claim 2 or 3, characterized in that: The pump cover (400) is concave toward the axial surface of the rotor to form a concave portion (420), and 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 a pump cover notch (422), and the pump cover notch (422) is correspondingly connected to the notch (325).

5. The heating pump with a plastic-sealed stator assembly according to claim 4, characterized in that: The area of ​​the axial cross section of the water guide block (421) gradually decreases along the rotation direction of the rotor, 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).

6. The heating pump with a plastic-encapsulated stator assembly according to claim 1, characterized in that: The electric heating component (100, 100') divides the heating chamber (5, 5') into an inner peripheral flow channel (1, 1') located on the radial inner side thereof and an outer peripheral flow channel (2, 2') located on the radial outer side thereof, and is provided with a water outlet in the radial direction connecting the inner peripheral flow channel (1, 1') and the outer peripheral flow channel (2, 2').

7. The heating pump with a plastic-encapsulated stator assembly according to claim 6, characterized in that: The plastic-sealed stator assembly (300′) further comprises an annular inner water-blocking sleeve (330′) sleeved on the water-blocking shell (320′), the axial end face of the inner water-blocking sleeve (330′) protruding an inner water-blocking sleeve rim (332′), and the radial outer surface thereof protruding spiral inner water-blocking sleeve flow guide ribs (333′), the water outlet comprises an inner water-blocking sleeve notch (331′) arranged on the inner water-blocking sleeve rim (332′), and the inner water-blocking sleeve flow guide ribs (333′) divide the inner peripheral flow channel (1′) in the circumferential direction.

8. The heating pump with a plastic-encapsulated stator assembly according to claim 6, characterized in that: The electric heating component (100) comprises an electric heating tube (110) and an isolation shell (120); the isolation shell (120) is a hollow columnar body that wraps the electric heating tube and is integrally cast with a base (130) on the electric heating tube (110); 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 shell (120).

9. The heating pump with a plastic-encapsulated stator assembly according to claim 6, characterized in that: The electric heating component (100′) comprises an electric heating tube (110), a second sealing ring (720), and a hollow cylindrical isolation shell (120′) cast on the electric heating tube and wrapping it; the isolation shell (120′) and the base (130′) are detachably fixedly connected, and the second sealing ring (720) is arranged axially between the isolation shell (120′) and the base (130′); the water outlet comprises a first water outlet (121′) and / or a first notch (129′) radially opened on the cylindrical outer periphery of the isolation shell (120′).

10. The heating pump with a plastic-sealed stator assembly according to claim 8 or 9, characterized in that: The outer surface of the isolation shell (120, 120') is provided with a fan-shaped guide block (127, 127') formed by raised ribs.

11. The heating pump with a plastic-sealed stator assembly according to claim 10, characterized in that: The isolation shell (120, 120') is located in the axial space between the guide block (127, 127') and the base (130, 130') and is also provided with an axial opening (126, 126') radially penetrating the inner peripheral flow channel (1, 1', 1") and the outer peripheral flow channel (2, 2', 2") 12. The heating pump with a plastic-encapsulated stator assembly according to claim 11, characterized in that: A fourth guide block (14, 14') is also provided directly above the axial opening (126, 126').

13. The heating pump with a plastic-encapsulated stator assembly according to claim 11, 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 axial 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.

14. The heating pump with a plastic-encapsulated stator assembly according to claim 13, 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.

15. The heating pump with a plastic-encapsulated stator assembly according to claim 11, characterized in that: The plastic-sealed stator assembly (300") also includes a first water guide sleeve (330") in the shape of an annular column and sleeved on the water-blocking shell (320") axially close to the impeller (230), and a second water guide sleeve (340") in the shape of a fan-shaped annular column and located below the first water guide sleeve and sleeved on the water-blocking shell (320"), wherein the axial end surface of the first water guide sleeve (330") protrudes a first water guide sleeve edge (332"), and the other axial side thereof extends out a water guide portion (333") inserted into the opening of the second water guide sleeve (340"), a radial outer surface protrusion of the first water guide sleeve (330") is located on a spiral first flow guide rib (334") on the water guide portion (333"), the water outlet includes a first water guide sleeve notch (331") arranged on the first water guide sleeve edge (332"), and the first flow guide rib (334") divides the inner peripheral flow channel in the circumferential direction.

16. The heat pump with a plastic-sealed stator assembly according to claim 15, characterized in that: The first water guide sleeve (330'') is axially welded to the water-blocking shell (320").

17. The heat pump with a plastic-sealed stator assembly according to claim 15, characterized in that: The axial end surface of the first water guide sleeve (330'') is provided with a water inlet hole (335"), and the side of the water guide portion (333") axially adjacent to the base (130") is provided with a water guide portion notch (336"), the inner diameter of the first water guide sleeve (330") is equal to the inner diameter of the second water guide sleeve (330"), and after the first water guide sleeve (330") and the second water guide sleeve (330") are assembled on the waterproof shell (320"), a cooling channel (7") for liquid to pass through is formed between them in the radial direction.

18. The heating pump with a plastic-encapsulated stator assembly according to claim 15, characterized in that: The radial outer surface of the second water guide sleeve (340") has a raised flange portion (341") at the end away from the impeller, and the outer edge of the flange portion (341") is turned up as a rim portion (342"), the distance from the top end of the axial opening (126, 126') to the horizontal plane is L2, and the distance from the end surface of the rim portion (342") facing the impeller to the horizontal plane is L4, then L2 is less than L4.

19. The heating pump with a plastic-encapsulated stator assembly according to claim 10, 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.

20. The heating pump with a plastic-encapsulated stator assembly according to claim 19, characterized in that: The outer surface of the isolation shell (120, 120') is located axially above the guide blocks (127, 127') and is also provided with a plurality of guide blocks (123, 123').

21. The heating pump with a plastic-encapsulated stator assembly according to claim 20, characterized in that: The outer surface of the isolation shell (120, 120') is also provided with a separation block (124, 124') formed by radial protruding ribs for separating the first water outlet (121, 121') or the first notch (129).

22. The heating pump with a plastic-encapsulated stator assembly according to claim 21, characterized in that: The guide block (123, 123') comprises a first guide block (11, 11') close to the guide block (127, 127'), a second guide block (12, 12') close to the end surface of the pump cover and a third guide block (13, 13') arranged therebetween; 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').

23. The heating pump with a plastic-encapsulated stator assembly according to claim 20, characterized in that: The pump cover (400) is a cylindrical body with an end surface (410) at one end and an open end 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 shell (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 shell (120, 120') to the bottom end.

24. The heating pump with a plastic-encapsulated stator assembly according to claim 23, 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 degrees.

25. The heating pump with a plastic-encapsulated stator assembly according to claim 23, 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').

26. The heating pump with a plastic-encapsulated stator assembly according to claim 23, characterized in that: The radial surface of the isolation shell (120, 120') is radially protruded to form a columnar heat-conducting column (125, 125') in an area between the end of each guide block (123, 123') and the blocking block (122, 122').

27. The heating pump with a plastic-sealed stator assembly according to claim 8 or 9, characterized in that: The inner surface of the isolation shell (120, 120') is radially concave or convex to form a heat conducting portion (128, 128') extending from the top end to the bottom end of the isolation shell.

28. The heat pump with sealed stator assembly according to claim 1, characterized in that: The invention also comprises a bearing seat (800) axially arranged between the impeller (230) and the plastic-encapsulated stator assembly (300, 300', 300"), wherein the end surface of the bearing seat (800) facing away from the plastic-encapsulated stator assembly (300, 300', 300") is provided with a groove (810), and the axial end surface of the impeller (230) facing the side of the bearing seat (800) protrudes into a convex rib portion (231) extending into the groove (810).

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