Heating water pump with overheating protection function

Abstract

A heating water pump with an overheating protection function comprises an electric heating assembly, a base, a rotor assembly with one end provided with an impeller, a stator and a pump cover provided with a water inlet and a water outlet, the stator comprises a stator assembly and a water separation shell, the rotor assembly is rotatably contained in an inner cavity of the water separation shell, and the stator is placed in the center of the upper end of the base. The electric heating assembly covers the pump cover in a facing mode to form a heating cavity surrounding the stator and communicating with the water outlet, an impeller cavity containing the impeller and communicating with the water inlet is defined by the axial space between the pump cover and the stator, and the electric heating assembly comprises an electric heating element and an isolation part and is fixed to the base and located in the heating cavity. And a first temperature sensor for providing overheating protection for the water pump is axially inserted into the isolation part on the side close to the base. The heating water pump with the overheating protection function is simple in overall structure and easy to assemble, the working stability of the heating water pump is improved, and meanwhile the production efficiency and the assembly efficiency of the heating water pump are both considered.

Description

Technical Field

[0001] The utility model relates to a heating water pump with a heating function, in particular to a heating water pump with overheat protection, and its IPC classification number is F04D 13 / 06. Background Art

[0002] Existing pumps with a heating function, as shown in the patent publication number CN114060288A, include a heater main body, a rotor assembly, a pump cover, an inner water isolation sleeve, a pump body, etc. The heater main body includes an inner peripheral flow channel sleeve, an outer peripheral flow channel sleeve in the shape of a circular column, and a cylindrical heater, and the heater is installed in the chamber surrounded by the inner peripheral flow channel sleeve and the outer peripheral flow channel sleeve. For traditional designed water pumps with a heating function to avoid overheat states such as dry burning (referring to heating without water) of the electric heating tube, there is an improvement need.

[0003] Regarding relevant terms and common knowledge, unless otherwise specified in this specification, 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", GB / T 7021 "Nomenclature for Heating Water Pumps", the mechanical industry standard JB / T5415 "Miniature Centrifugal Electric Pumps", the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by China Machine Press in 1983 or 1997, "Pump Theory and Technology" published by China Machine Press in 2014, "Modern Pump Theory and Technology" published by China Astronautic Publishing House in 2011, "Pumps and Fans" published by China Electric Power Press in 2008, and the patent document CN114060288B. Summary of the Utility Model

[0004] To meet the improvement needs described in the background art, the utility model provides the following technical solutions:

[0005] A heating water pump with overheat protection includes an electric heating component, a base, a rotor assembly with an impeller at one end, a stator, and a pump cover provided with inlet and outlet ports. The stator includes a stator assembly and a water isolation shell for accommodating the stator assembly. The rotor assembly is rotatably accommodated in the inner cavity of the water isolation shell. The stator is placed at the center of the upper end of the base. After it is covered with the pump cover in an opposing manner, a heating cavity that surrounds the stator and is communicated with the outlet port is formed. The space between the axial directions of the pump cover and the stator forms an impeller cavity for accommodating the impeller and is communicated with the inlet port. It is characterized in that: the electric heating component includes an electric heating element and a hollow columnar isolation part cast on and wrapping the electric heating element, which is fixed to the base and located in the heating cavity. A first temperature sensor for providing overheat protection for the water pump is axially inserted into the isolation part near the base side.

[0006] For this heating water pump, by providing a first temperature sensor at the isolation part of the electric heating component, the working state of the electric heating element can be accurately monitored through conduction by the isolation part, thus effectively preventing the electric heating element from dry burning. Moreover, the overall structure is simple and the assembly is easy, taking into account both the working stability of the heating water pump and its production and assembly efficiency.

[0007] Further, an axial mounting hole is provided on the axial side of the isolation part located at the base, and the first temperature sensor is inserted and installed in this mounting hole.

[0008] Further, the drain port extends outward along the circumferential direction of the pump cover. In the axial projection of this heating water pump with overheat protection, a plane passing through the axis of the pump and parallel to the axis of the drain port divides the heating water pump with overheat protection into a first region S1 on the side close to the drain port and a second region S2 on the side far from the drain port, and the projection of the first temperature sensor is located in the first region S1.

[0009] Further, this heating water pump with overheat protection further includes a circuit board arranged in the space surrounded by the base. The circuit board is axially provided with an IGBT towards the base side. A heat conduction bracket is provided between the base and the IGBT axially, and a second temperature sensor is provided between the IGBT and the circuit board.

[0010] Even further, in the axial projection of the IGBT in this heating water pump with overheat protection, at least part of it is located in the first region S1.

[0011] Further, the isolation part divides the heating cavity into an inner circumferential flow channel located radially inside it and an outer circumferential flow channel located radially outside it. A water passing port connecting the impeller cavity and the inner circumferential flow channel is provided on the water isolation shell and / or the pump cover, and a water passing port connecting the inner circumferential flow channel and the outer circumferential flow channel is provided radially on the isolation part.

[0012] Even further, the isolation part and the base are integrally cast based on the electric heating element. The water passing port includes a first water passing port and / or a first notch radially opened on the columnar outer periphery of the isolation part.

[0013] Even further, the pump cover is a cylindrical body with one end having an end face and the other end being open. An outlet groove with an outlet is axially concave formed under the end face. A rib is radially protruded on the outer surface of the isolation part to form a blocking block, and the blocking block axially extends from the top end to the bottom end of the isolation part.

[0014] Even further, the water isolation shell is injection molded on the stator assembly. It includes a cylindrical inner shell part for installing the rotor, an upper end part radially extending 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 far from the opening, and an outer shell part connecting the upper and lower end parts. The stator assembly is wrapped in the stator cavity surrounded by the inner and outer shell parts and the upper and lower end parts.

[0015] Further, the stator further includes an annular first water guide sleeve sleeved on the axial side of the water isolation shell close to the impeller, and a fan-shaped annular second water guide sleeve located below the first water guide sleeve and sleeved on the water isolation shell. The axial end face of the first water guide sleeve protrudes a first water guide sleeve edge, and a water guide part on the other axial side thereof extends out and inserts into the opening of the second water guide sleeve. A spiral first water guide rib is protruded on the radially outer surface of the first water guide sleeve at a part located on the water guide part. The water inlet includes a first water guide sleeve notch provided on the first water guide sleeve edge, and the first water guide rib divides the inner circumferential flow channel in the circumferential direction.

[0016] Further, the stator assembly includes an iron core and a pin. The pin includes a columnar pin body and columnar first and second insertion arms extending axially outward from the pin body. One axial end of the pin is connected to the iron core, and the first and second insertion arms at the other axial end thereof are inserted and assembled into the base.

[0017] The more specific design and technical effects of the present utility model will be further described in conjunction with the drawings in the specific embodiments. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the heating water pump with overheat protection of the present utility model;

[0019] Figure 2 is an exploded structural schematic diagram of the heating water pump with overheat protection of the present utility model;

[0020] Figure 3 is a cross-sectional view of the heating water pump with overheat protection of the present utility model in plane M;

[0021] Figure 4 is a cross-sectional view of the heating water pump with overheat protection of the present utility model in plane N;

[0022] Figure 5 is a top view of the heating water pump with overheat protection of the present utility model;

[0023] Figure 6 is a three-dimensional structural schematic diagram of the electric heating component of the present utility model;

[0024] Figure 7 is an exploded structural schematic diagram of the second embodiment of the electric heating component of the present utility model;

[0025] Figure 8 is an axial cross-sectional view of the rotor of the present utility model after being installed on the stator;

[0026] Figure 9 is a partial cross-sectional view of the stator of the present utility model;

[0027] Figure 10 is an exploded structural schematic diagram of the stator of the present utility model;

[0028] Figure 11 is a three-dimensional structural view of another embodiment of the electrothermal component of the present utility model;

[0029] Figure 12 is a three-dimensional structural view of the pump cover of the present utility model;

[0030] Figure 13 is a radial cross-sectional view of the heating water pump with overheat protection of the present utility model;

[0031] Figure 14 is a schematic diagram of the flow trajectory of the heating water pump with overheat protection of the present utility model in the inner peripheral flow channel;

[0032] Figure 15 is a schematic diagram of the flow trajectory of the heating water pump with overheat protection of the present utility model in the outer peripheral flow channel;

[0033] Wherein:

[0034] 1 - inner peripheral flow channel, 2 - outer peripheral flow channel, 3 - electrical cavity, 4 - stator cavity, 5 - heating cavity, 6 - impeller cavity, 100 - electrothermal component, 100' - electrothermal component, 110 - electrothermal element, 120 - isolation part, 121 - first water passing port, 122 - blocking block, 123 - first notch, 124 - mounting hole, 130 - base, 130' - base, 200 - rotor assembly, 210 - rotating shaft, 220 - main body part, 230 - impeller, 240 - permanent magnet, 300 - stator, 310 - stator assembly, 311 - iron core, 312 - skeleton, 313 - enameled wire, 314 - pin, 315 - pin body, 316 - first insertion arm, 317 - second insertion arm, 320 - water isolation shell, 321 - inner shell part, 322 - upper end part, 323 - lower end part, 324 - outer shell part, 330 - first water guide sleeve, 331 - first water guide sleeve notch, 332 - first water guide sleeve border, 333 - water guide part, 334 - first flow guiding rib, 340 - second water guide sleeve, 400 - pump cover, 410 - end face, 411 - water outlet, 412 - water outlet groove, 430 - water inlet, 440 - drain port, 500 - circuit board, 510 - IGBT, 600 - heat conduction bracket, 700 - rear cover, 800 - first temperature sensor, 810 - second temperature sensor 910 - sealing gasket, 920 - screw Detailed implementation manners

[0035] The embodiments of the present utility model are further improvements to the prior application CN114060288B. The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0036] As Figures 1 to 3 shown, a heating water pump with overheat protection disclosed by the present utility model includes an electric heating component 100, a base 130 fixedly connected to the electric heating component 100, a rotor assembly 200, a stator 300, a pump cover 400 hermetically connected to the base 130, a rotating shaft 210 fixed to the stator 300 and sleeved with the rotor assembly 200, a rear cover 700 hermetically arranged at one axial end of the base 130, a circuit board 500 and a first temperature sensor 800 arranged in an electrical cavity 3 formed by the base 130 and the rear cover 700.

[0037] See Figure 2 and Figure 3 As shown in FIGS. and, the main body of the electric heating component 100 is a columnar body with a hollow cavity, and a water passing port is arranged radially thereon; the rotor assembly 200 includes a main body portion 220, a permanent magnet 240 fixed to one axial side of the main body portion 220, and an impeller 230 fixed to the other axial side of the main body portion 220; the stator 300 includes a stator assembly 310 and a water isolation shell 320 that separates the liquid from the stator assembly 310. The stator assembly 310 includes an iron core 311, a skeleton 312 fixed to the iron core, and an enameled wire 313 wound around 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 430 for water inlet is arranged at the center of the end face 410, and a water outlet 440 for water drainage is arranged on the periphery of the cylindrical body. A water passing port is arranged on the pump cover 400 and / or the water isolation shell 320. During installation, the stator 300 is arranged at the upper end of the base 130 and located in the columnar cavity of the electric heating component 100. The rotor assembly 200 is rotatably installed on the rotating shaft 210. After the pump cover 400 and the base 130 are hermetically covered and fixed, they enclose a heating cavity 5 with the stator 300, preferably fixed by screws. After installation, the electric heating component 100 is located between the outer peripheral side of the stator assembly 300 and the inner peripheral wall of the pump cover 400, separating the heating cavity 5 into an inner peripheral flow channel 1 located radially inside it and an outer peripheral flow channel 2 located radially outside it. The upper end faces of the pump cover 400 and the stator assembly 300 enclose an impeller cavity 6 for accommodating the impeller 230. Among them, the water inlet 430 of the pump cover is communicated with the impeller cavity 6, the water passing port communicates the inner peripheral flow channel 1 and the impeller cavity 6, and the water passing port communicates the inner peripheral flow channel 1 and the outer peripheral flow channel 2.

[0038] SeeFigure 3 and Figure 6 For the heating water pump with overheat protection of the present utility model, its base 130 and the electric heating component 100 are integrally cast, preferably made of cast aluminum material. The electric heating component 100 includes an electric heating element (or tubular electric heating element, etc.) 110, and a hollow columnar isolation part 120 that wraps the main body of the electric heating element 110 to separate it from the liquid to be heated (only the exposed terminal part). The upper end of the hollow column is open, and the lower end is connected to the base 130 and integrally formed. Of course, as other embodiments, see Figure 7 , the electric heating component 100' and the base 130' can also be designed as two separable independent parts. During manufacturing, first, the electric heating element 110 is used as an insert and cast to form an isolation part 120' covering the outer surface of the electric heating element 110, and then the electric heating component 100' is fixedly connected to the base 130' through screws 920. To prevent water leakage, a gasket 910 is also provided between the axial directions of the electric heating component 100' and the base 130'. Further, during assembly, after the base 130 and the pump cover 400 are covered to form a heating chamber 5, the isolation part 120 divides the heating chamber 5 into an inner peripheral flow channel 1 located radially inside it and an outer peripheral flow channel 2 located radially outside it. The water passing port can be a first water passing port 121 designed at the lower end of the isolation part 120 near the base 130 and radially penetrating the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation. In other embodiments, the water passing port can also be any through hole radially penetrating the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation provided at other positions on the outer peripheral surface of the isolation part 120, or even as Figure 11 shown, a first notch 123 radially penetrating the inner peripheral flow channel 1 and the outer peripheral flow channel 2 for liquid circulation at the top end of the isolation part 120. The heating water pump with overheat protection of the present utility model adopts an integral casting process to integrally manufacture the isolation part 120 and the base 130 based on the electric heating element 110. The whole pump can form inner and outer peripheral flow channels with fewer parts and assembly processes, reducing the production and assembly difficulties and improving the assembly efficiency and anti-electric leakage performance of the heating water pump. Further, see Figure 3 , an axial mounting hole 124 is provided on the axial side of the isolation part 120 located at the base 130, and the first temperature sensor 800 is inserted and installed in the mounting hole 124. Through the above-designed heating water pump, the working state of the electric heating element 110 can be accurately monitored through conduction by the isolation part 120, preventing the electric heating element 110 from overheating and damaging other parts. Moreover, the overall structure of the heating water pump is simple and easy to assemble, improving the working stability of the heating water pump while taking into account its production and assembly efficiency.

[0039] See Figure 2 and Figure 4, the heating water pump with overheat protection of the present utility model further includes a heat conduction bracket 600 in the electrical cavity 3. The circuit board 500 is axially provided with an IGBT 510 towards the base 130 side, and a second temperature sensor 810 is provided between the circuit board 500 and the IGBT 510. During assembly, the heat conduction bracket 600 is arranged between the base 130 and the IGBT and is in close contact with their axial surfaces. Through the above design, while using the liquid in the heating cavity 5 to exchange heat with the IGBT, the second stable sensor can be used to detect the heating state of the IGBT, avoiding the overheat protection failure caused by the failure of the first temperature sensor, and further improving the working stability of the heating water pump.

[0040] Preferably, see Figure 1 As shown in FIGS. 4 and 5, the drain port 440 of the pump cover 400 of the heating water pump with overheat protection of the present utility model extends outward along the circumference of the cylindrical body. In order to enable the liquid entering the heating cavity to fully exchange heat with the electric heating component, when the heating water pump with overheat protection of the present utility model is installed, its drain port is located above the axis of the heating water pump with overheat protection. In the axial projection of the heating water pump with overheat protection, a plane L2 passing through the axis L of the heating water pump with overheat protection and parallel to the axis L1 of the drain port 440 divides the heating water pump with overheat protection into a first region S1 on the side close to the drain port 440 and a second region S2 on the side far from the drain port 440. The projection of the first temperature sensor 800 is located in the above-mentioned first region S1. Through this design, by using the first temperature sensor to be arranged in the first region of the heating water pump close to the drain port, it can quickly and accurately detect whether the electric heating element has dry burned, reduce the damage caused by excessive heating of the electric heating element, and further improve the working stability of the heating water pump. Further, in the axial projection of the heating water pump with overheat protection, at least part of the IGBT 510 is located in the first region S1. Through this design, the IGBT can be used to detect the heating state of the electric heating component to judge whether the water pump is in a dry burning state, improving the accuracy of detection.

[0041] Further, see Figure 6 and Figure 12 , a rib-shaped blocking block 122 extending axially from the top end to the bottom end of the isolation part protrudes from the radially outer surface of the isolation part 120 of the electric heating component 110 of the heating water pump with overheat protection of the present utility model. The end face 410 of the inner cavity of the pump cover 400 is axially concave to form a water outlet groove 412, and the water outlet groove 412 is provided with a water outlet 411 communicating the water outlet groove 412 with the drain port 440. After the heating water pump is assembled, the blocking block 122 of the isolation part 120 separates the first water inlet 121 (or the first notch 123) on the circumferential side close to the blocking block 122 and separates the water outlet groove 412 on the circumferential side far from the blocking block 122. Among them, the side close to the blocking block is defined as in the axial projection of the heating water pump, seeFigure 13 The included angle β formed by the line segment OA formed by connecting the axis O of the heating water pump and any point A on the contour line of the first water inlet 121 (or the first notch 123) and the line segment OB formed by connecting the axis O of the heating water pump and any point B on the contour line of the baffle block 122 is an acute angle. Similarly, the included angle formed by the line segment formed by connecting the axis of the heating water pump and a point on the contour line of the water outlet groove 412 and the line segment formed by connecting the axis of the heating water pump and the connecting line on the contour line of the baffle block 122 is an acute angle. The above design enables the liquid entering the outer peripheral flow channel 2 to rotate around the radial outer surface of the electric heating component for one week and then be discharged from the pump cover, increasing the heat conduction time between the liquid and the electric heating component and improving the heating efficiency of the heating water pump.

[0042] See Figure 8 In this utility model, the water isolation shell 320 uses the stator assembly 310 as an insert and is injection-molded on the stator assembly 310 through a mold. The water isolation shell 320 includes a cylindrical inner shell part 321 for installing the rotor, 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 end parts. The stator assembly 310 is wrapped in the stator cavity 4 formed by the inner and outer shell parts and the upper and lower end parts. When assembling the heating water pump with overheat protection of this utility model, first fix the rotating shaft 210 to the inner shell part 321, and then rotatably sleeve the rotor assembly 200 on the rotating shaft 210. The stator designed as above has a simple overall structure, and the inner shell part can be injection-molded into a thin layer covering the pole arc surface of the iron core, facilitating the assembly of the heating water pump while taking into account the electromagnetic performance. Further, see Figure 9 In this utility model, the stator assembly 310 further includes a pin 314. The pin 314 includes a columnar pin body 315 and columnar first and second insertion arms 316 and 317 extending axially outward from the pin body 315. One axial end of the pin 314 is connected to the iron core 311, and the first and second insertion arms 316 and 317 at the other axial end are inserted and assembled into a base (not shown). Through this design, it is convenient to externally connect and ground the connection between the stator assembly and the base, improving the working stability of the heating water pump while taking into account the assembly efficiency.

[0043] See Figure 10, the stator of the present utility model further includes a ring-shaped first water guide sleeve 330 sleeved on the axial side of the water isolation shell 320 close to the impeller 230 and a fan-shaped ring-shaped second water guide sleeve 340 located below the first water guide sleeve and sleeved on the water isolation shell. Further, the axial end face of the first water guide sleeve protrudes a first water guide sleeve edge 332, and the other axial side thereof extends and inserts a water guide part 333 at the opening of the second water guide sleeve. A spiral first water guide rib 334 is protruded on the radially outer surface of the first water guide sleeve 330 at the water guide part 333. The water inlet includes a first water guide sleeve notch 331 provided on the first water guide sleeve edge 332, and the first water guide rib 334 divides the inner peripheral flow path 1 circumferentially. Through this design, the mold structure for producing the plastic-encapsulated stator assembly can be further optimized, and the qualified rate of producing the plastic-encapsulated stator assembly can be improved.

[0044] The working principle of the heating water pump with overheat protection of the present utility model is shown in Figures 12 to 15 , when the heating water pump works, the impeller 230 rotates to push the liquid to enter the inner peripheral flow path 1 from the notch 331 (i.e., a1). The liquid in the inner peripheral flow path 1 is guided by the first water guide rib 334 and rotates circumferentially once on the upper side of the axial direction of the first water guide rib 334 (the trajectory of a2 can be referred to) and flows to the lower side of the axial direction of the first water guide rib 334 and leans against the first water passing port 121 (i.e., a3); the liquid passes through the first water passing port 121 and enters the outer peripheral flow path 2; the liquid entering the outer peripheral flow path 2 is separated by the blocking block 122 from the first water passing port 121 and rotates circumferentially once (the trajectory of b2 can be referred to) and flows to the upper side of the axial direction of the blocking block 122 (i.e., b3); finally, the liquid passes through the water outlet 411 and is discharged from the drain port 440. The heating water pump of the present utility model makes full use of the heat conduction of the liquid flowing through the inner peripheral flow path and the outer peripheral flow path formed by the electric heating component, the pump cover and the stator assembly, has high heating efficiency, and the component structures required for the electric heating component and the flow path are simple, which is convenient for automatic assembly.

Claims

1. A heating water pump with overheat protection, comprising an electric heating component (100), a base (130), a rotor component (200) with an impeller (230) at one end, a stator (300) and a pump cover (400) provided with an inlet and a water outlet, wherein the stator (300) comprises a stator component (310) and a water-proof shell (320) for accommodating the stator component, the rotor component (200) is rotatably accommodated in the inner cavity of the water-proof shell (320), the stator (300) is placed at the center of the upper end of the base (130), and the stator (300) and the pump cover (400) are matched to form a heating cavity (5) surrounding the stator (300) and communicating with the water outlet (440), the axial space between the pump cover (400) and the stator (300) encloses an impeller cavity (6) for accommodating the impeller (230) and communicating with the water inlet (430), characterized in that: The electric heating component (100) comprises an electric heating element (110) and a hollow columnar isolating portion (120) cast on and wrapping the electric heating element (110), which is fixed to a base (130) and located in a heating chamber (5), and a first temperature sensor (800) for providing overheating protection for the water pump is axially inserted into the isolating portion (120) near the base (130).

2. The heating water pump with overheat protection according to claim 1, characterized in that: The isolation portion (120) is axially located on the side of the base (130) and is provided with an axial mounting hole (124), and the first temperature sensor (800) is inserted and mounted in the mounting hole (124).

3. The heating water pump with overheat protection according to claim 1 or 2, characterized in that: The drain outlet (440) extends outward along the circumference of the pump cover (400). In the axial projection of the heating water pump with overheat protection, a plane passing through the axis of the pump and parallel to the axis of the drain outlet (440) divides the heating water pump with overheat protection into a first area S1 located on the side close to the drain outlet (440) and a second area S2 located on the side away from the drain outlet (440). The projection of the first temperature sensor (800) is located in the first area S1.

4. The heating water pump with overheat protection according to claim 3, characterized in that: The invention also comprises a circuit board (500) arranged in a space surrounded by the base (130), an IGBT (510) being arranged on the circuit board (500) axially facing the base (130), a heat conducting bracket (600) being arranged axially between the base (130) and the IGBT (510), and a second temperature sensor (810) being arranged between the IGBT (510) and the circuit board (500).

5. The heating water pump with overheat protection according to claim 4, characterized in that: The IGBT (510) is at least partially located in the first area S1 in the axial projection of the heating water pump with overheating protection.

6. The heating water pump with overheat protection according to claim 1, characterized in that: The isolation portion (120) divides the heating chamber (5) 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 water-blocking shell (320) and / or the pump cover (400) are provided with a water passage connecting the impeller chamber (6) and the inner peripheral flow channel. The isolation portion (120) is provided with a water passage connecting the inner peripheral flow channel (1) and the outer peripheral flow channel (2) in the radial direction.

7. The heating water pump with overheat protection according to claim 6, characterized in that: The isolating portion (120) and the base (130) are integrally cast based on the electric heating element (110), and the water outlet comprises a first water outlet (121) and / or a first notch (123) radially opened on the cylindrical outer periphery of the isolating portion (120).

8. The heating water pump with overheat protection according to claim 7, 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) has radially protruding ribs to form a blocking block (122). The blocking block (122) extends axially from the top end of the isolation part to the bottom end.

9. The heating water pump with overheat protection according to claim 6, characterized in that: The waterproof shell (320) is injection-molded on the stator assembly (310), and includes a cylindrical inner shell portion (321) for mounting a rotor, an upper end portion (322) extending radially outward from the outer edge of the opening of the inner shell portion, 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. The stator assembly (310) is enclosed in a stator cavity (4) surrounded by the inner and outer shell portions and the upper and lower ends.

10. The heating water pump with overheat protection according to claim 9, characterized in that: The stator (300) further comprises a first water guide sleeve (330) in the shape of an annulus 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 annulus column and located below the first water guide sleeve and sleeved on the water-blocking shell. The axial end face of the first water guide sleeve 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. The 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 comprises 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.

11. The heating water pump with overheat protection according to claim 1, characterized in that: The stator assembly comprises an iron core (311) and a plug pin (314), wherein the plug pin (314) comprises a columnar plug pin body (315) and a columnar first plug arm (316) and a second plug arm (317) extending axially outward from the plug pin body (315); one axial end of the plug pin (314) is connected to the iron core (311), and the first plug arm (316) and the second plug arm (317) at the other axial end are inserted and assembled in the base (130).

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