Electric pump for electric vehicle power thermal management system

Abstract

An electric pump for an electric vehicle power thermal management system comprises an electric motor and an axially driven impeller thereof to drive a pump liquid in a volute chamber, a cylindrical cavity surrounding a motor housing, a cylindrical heater built in the cavity to heat the pump liquid, and an inner peripheral partition and an outer peripheral partition respectively arranged around the inner and outer peripheries of the heater, the cavity is divided into an inner peripheral flow channel and an outer peripheral flow channel respectively bypassing the inner and outer peripheries of the cylindrical heater for the pump liquid to pass through, the two flow channels are only switched once at one end of the cavity, which not only avoids repeated switching of several sections of spiral flow channels in previous designs, rapid changes in flow direction, uneven flow distribution, local high temperature and trapped gas problems, but also the spiral rise angle of the partition in the uppermost section of the cavity is less than 20°, which reduces the curvature radius of the liquid flow motion trajectory and increases the centrifugal acceleration to exceed the gravity acceleration, so that the liquid flow can climb more smoothly over the highest position of the cavity and flush away the gas in the flow channel.

Description

Technical Field

[0001] The invention relates to an electric pump for an electric vehicle power thermal management system, and the IPC classification may belong to F04D13 / 06, F04D29 / 58 or F04D29 / 40. Background Art

[0002] In cold environments, power supply thermal management systems in facilities such as electric vehicles often use micro-centrifugal electric pumps to drive thermal fluids to increase the temperature of the battery to ensure its electrical performance. To this end, the applicant has proposed a design of an electric pump for a power battery thermal management system, see Chinese invention patent applications CN114060288A and CN202122621949.1. The heating cavity of the electric pump surrounds the outer periphery of the cylinder of the pump motor, and is divided into inner and outer peripheral flow channels by a cylindrical heater. Each of the inner and outer peripheral flow channels is divided into several sections of spiral flow channels along the circumference by a partition. The reversing flow channels formed by the pump cover and the pump body at both ends of the axial direction are sequentially connected. The liquid flow transported by the volute chamber of the upstream connecting pump is heated by the cylindrical heater and pumped out from the outlet of the downstream connecting pump. However, the inner and outer spiral flow channels of the electric pump are at a certain angle to the axial and circumferential directions of the pump shaft. After the liquid flows through the reversing flow channels at both ends of the axial direction and flips, the flow direction changes sharply, resulting in uneven flow velocity distribution, local high temperature and trapped air, and the reversal is repeated more than six times. Moreover, the actual manufacturing and installation are troublesome, the screw installation is easily blocked by the baffle, and the cylindrical heater and the outer flow channel sleeve need to be rotated and installed.

[0003] For relevant terminology and common knowledge, please refer to the national standard 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 "Terminology of centrifugal pumps", the machinery industry standard JB / T5415 "Micro centrifugal electric pumps", the 1992 edition of "IEC Electrical and Electronic Standard Terms Dictionary" published by China Standards Press, the 1983 or 1997 editions of "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by Machinery Industry Press, the 2014 edition of "Pump Theory and Technology" published by Machinery Industry Press, the 2011 edition of "Modern Pump Theory and Technology" published by China Aerospace Press, the 2008 edition of "Pumps and Fans" published by China Electric Power Press, and the 2011 edition of "Electrical Vehicle Power Supply System" published by Chemical Industry Press. Summary of the invention

[0004] The purpose of the present invention is to provide an electric pump for an electric vehicle power thermal management system. Compared with the previous designs such as Examples 1 and 3 in the CN114060288A specification and the Examples in the CN202122621949.1 specification, it avoids repeated reversal of several sections of spiral flow channels and sudden changes in flow direction, resulting in uneven flow distribution, local high temperature and trapped air problems.

[0005] The technical solution of the present invention is an electric pump for an electric vehicle power thermal management system, comprising:

[0006] - an electric motor having a cylindrical motor housing, with an axially driven impeller driving the pumping liquid in a volute;

[0007] - A cylindrical pump housing is roughly coaxially sleeved on the outer periphery of the motor housing, and a cavity surrounding the motor housing is provided between the pump housing and the motor housing, and the cavity is an axial annular cylindrical shape;

[0008] - a cylindrical heater built into the cavity for heating the pump liquid, located between the outer periphery and the inner periphery of the cavity along the axial direction, dividing the cavity into an outer periphery cavity and an inner periphery cavity;

[0009] - The peripheral cavity is surrounded by a peripheral partition plate to divide the peripheral cavity into a peripheral flow channel surrounding the periphery of the cylindrical heater;

[0010] - An inner peripheral partition is arranged around the inner peripheral cavity to divide the inner peripheral cavity into an inner peripheral flow channel that goes around the inner periphery of the cylindrical heater;

[0011] - At one end of the cavity along the axial direction, the upstream of the outer peripheral flow channel is connected to the downstream of the inner peripheral flow channel, and at the other end of the cavity along the axial direction, the downstream of the outer peripheral flow channel leads to the discharge port of the electric pump, and the upstream of the inner peripheral flow channel leads to the volute chamber;

[0012] ——The pump liquid output from the volute chamber passes through the above two flow channels and is discharged through the discharge port of the electric pump.

[0013] The electric pump has a cavity surrounding the motor housing, wherein a cylindrical heater for heating the pump liquid is built in to separate the cavity into an inner and outer part, and each of the two parts is then surrounded by a partition to separate the two into an outer flow channel and an inner flow channel. The two flow channels are switched only once at one end of the cavity, thus avoiding repeated switching of several sections of spiral flow channels in previous designs, sudden changes in flow direction, uneven flow distribution, and the occurrence of local high temperature and trapped air problems.

[0014] The further optimized design is: the pump is a horizontal canned motor pump,

[0015] ——The peripheral partition is formed by connecting one or more sections of spiral partitions with different pitch angles. The topmost generatrix L of the peripheral cavity cylinder is 15° counterclockwise along the cylinder toward the upstream of the peripheral flow channel and is defined as the liquid flow starting end E. The topmost generatrix L of the peripheral cavity cylinder is 15° clockwise along the cylinder toward the downstream of the peripheral flow channel and is defined as the liquid flow ending end F. The spiral pitch angle α of the peripheral partition between EF is less than 20°, so as to reduce the curvature radius of the liquid flow motion trajectory in the peripheral flow channel; and / or,

[0016] ——The inner peripheral partition is connected by one or more sections of spiral partitions with different lead angles. The top generatrix L' of the inner peripheral cavity cylinder is defined as the starting end E' of the liquid flow at 15° counterclockwise along the cylinder toward the upstream of the inner peripheral flow channel. The top generatrix L' of the inner peripheral cavity cylinder is defined as the ending end F' of the liquid flow at 15° clockwise along the cylinder toward the downstream of the inner peripheral flow channel. The spiral lead angle β of the inner peripheral partition located between E'F' is less than 20° to reduce the curvature radius of the liquid flow motion trajectory in the inner peripheral flow channel.

[0017] In this way, the centrifugal acceleration a of the liquid flow at the highest position of the outer peripheral cavity or the inner peripheral cavity exceeds the gravitational acceleration g, so that it can climb over the highest position more smoothly and flush away the gas in the flow channel.

[0018] The second further optimized design is: the outer peripheral flow channel is provided with multiple outer guide fins in the same direction as the outer peripheral baffle to form multiple outer guide grooves; the inner peripheral flow channel is provided with multiple inner guide fins in the same direction as the inner peripheral baffle to form multiple inner guide grooves. Both the inner and outer peripheral flow channels are divided into multiple narrower guide grooves, which evenly guide and distribute the pump liquid along the two sides and the center of the flow channel, and there will be no phenomenon that the flow rate on the left or right bank of the flow channel is too low, causing the heat transfer in that part to be too slow, thereby causing local high temperature or trapped air in that part.

[0019] One of the typical designs of this technical solution is: the electric pump also includes:

[0020] - Pump cover: a pump cover shell having the pump cover and a cylindrical pump cover shell protruding from the outer edge of the pump cover;

[0021] ——Pump body: formed with the bottom plate which is roughly annular and a cylindrical inner shell protruding from the inner ring edge of the bottom plate;

[0022] ——An outer water jacket built into the outer peripheral cavity: having an outer cylindrical base body in a cylindrical shape, divided into a semi-outer water jacket 1 and a semi-outer water jacket 2 along a plane K passing through the axial direction, the two being assembled into a complete outer water jacket, the outer peripheral baffle being divided into two parts by the plane K, namely, an outer peripheral baffle 1 and an outer peripheral baffle 2, the outer guide fins being divided into two parts by the plane K, namely, an outer guide fin 1 and an outer guide fin 2, the outer guide fin 1, the outer peripheral baffle 1 and the semi-cylindrical base body 1 are integrally formed to form the semi-outer water jacket 1, the outer guide fin 2, the outer peripheral baffle 2 and the semi-cylindrical base body 2 are integrally formed to form the semi-outer water jacket 2;

[0023] ——The cavity is formed by the pump cover at the two ends of the motor and the pump body connected and enclosed. The pump cover of the pump cover and the bottom plate of the pump body constitute the two ends of the cavity. The pump cover outer shell constitutes the outer periphery of the cavity and becomes a part of the pump outer shell. The inner shell of the pump body constitutes the inner periphery of the cavity and becomes the motor shell. The outer cylindrical base is attached to the pump cover outer shell and is combined into a pump shell.

[0024] In this way, the integral outer water jacket is divided into two parts, each of which is integrally injection molded with the corresponding outer peripheral partition and outer guide fin. When installed, it is assembled into a complete outer water jacket on the outer periphery of the tubular heater to form an outer peripheral flow channel and an outer guide groove. The process mold is simple and the production and installation are convenient.

[0025] The second typical design of this technical solution is that the electric pump also includes:

[0026] - an inner water jacket built into the inner peripheral cavity, having a cylindrical inner cylindrical base, located between the outer periphery and the inner periphery of the inner peripheral cavity along the axial direction, dividing the inner peripheral cavity into an inner peripheral cavity 1 and an inner peripheral cavity 2, wherein the inner peripheral cavity 1 is located between the outer peripheral cavity and the inner peripheral cavity 2;

[0027] - the inner peripheral partition is only arranged in the inner peripheral cavity 1, dividing the inner peripheral cavity 1 into the inner peripheral flow channel;

[0028] - At one end of the cavity along the axial direction, the upstream of the outer peripheral flow channel is connected to the inner peripheral cavity 2, and at the other end of the cavity, the inner peripheral cavity 2 is connected to the volute chamber.

[0029] The heat dissipation of the motor is accelerated by the liquid flow in the inner peripheral cavity 2 adjacent to the outer cylindrical surface of the motor housing.

[0030] A further optimized design is that the electric pump also includes:

[0031] ——Pump cover: a cylindrical pump cover shell formed with a pump cover and protruding from the outer edge of the pump cover;

[0032] ——Pump body: formed with the bottom plate which is roughly annular, a cylindrical inner shell protruding from the inner ring edge of the bottom plate, and a plurality of axial flow guide fins arranged along the circumferential direction of the outer cylindrical surface of the inner shell and extending along the axial direction;

[0033] The cavity is formed by the pump cover at the two ends of the motor and the pump body connected and enclosed, the pump cover of the pump cover and the bottom plate of the pump body constitute the two ends of the cavity, the outer shell of the pump cover constitutes the outer periphery of the cavity, which becomes the pump outer shell, and the inner shell of the pump body constitutes the inner periphery of the cavity, which becomes the motor shell;

[0034] The inner shell and the multiple axial guide fins on its outer periphery are enclosed by the inner cylindrical base, dividing the inner peripheral cavity into multiple axial flow channels;

[0035] The inner peripheral baffle and the plurality of inner guide fins are wound around the outer peripheral cylindrical surface of the inner cylindrical base and are integrally formed to form the inner water jacket;

[0036] At the first end of the cavity, the inner cylindrical base extends inwardly to form an annular end face, and the annular end face is provided with a plurality of upper water grooves along the circumference for connecting with the volute chamber; at the second end of the cavity, the inner cylindrical base is provided with a plurality of lower water grooves along the circumference for connecting with the upstream of the outer peripheral flow channel; the plurality of upper water grooves, the plurality of lower water grooves are connected with the plurality of axial flow channels in a one-to-one correspondence.

[0037] In this way, through the multiple axial flow channels formed by the axial guide fins, the liquid flow in the inner peripheral cavity 2 is evenly guided around the circumference of the outer cylindrical surface of the motor housing, and the heat dissipation of the motor is even and efficient.

[0038] For the technical solutions and effects of each specific design, please refer to the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 2. It is an exploded schematic diagram of a horizontal canned motor pump according to an embodiment of the present invention;

[0040] Figure 2 yes Figure 1 A three-dimensional schematic diagram of an electric pump;

[0041] Figure 3 yes Figure 1 Schematic diagram of the left side of the electric pump;

[0042] Figure 4 is along Figure 3 The cutaway circle A shows a three-dimensional schematic diagram of the inner cylindrical surface of the cartridge heater after the pump cover and the cartridge heater are removed;

[0043] Figure 5 is along Figure 3 The A' section circle indicates a three-dimensional schematic diagram after the pump cover is removed from the inner peripheral cylindrical surface of the outer cylindrical base and the outer cylindrical base is cut away;

[0044] Figure 6 yes Figure 3 BB cross-sectional view (inner and outer guide fins omitted);

[0045] Figure 7 yes Figure 6 Partial magnification Figure I ;

[0046] Figure 8 yes Figure 6 Partial magnification Figure II ;

[0047] Fig. 9 yes Figure 1 A three-dimensional diagram of the pump body of the electric pump;

[0048] Fig.10 yes Figure 1 A three-dimensional view of the inner water jacket of the electric pump (without the inner guide fins);

[0049] Fig.11 yes Figure 1 Front view of the inner water jacket of the electric pump;

[0050] Fig.12 yes Figure 1 Cross-sectional view of the inner water jacket of the electric pump (without the inner guide fins);

[0051] Fig.13 yes Figure 1 A schematic three-dimensional diagram showing the combination of the first and second half water jackets of the electric pump;

[0052] Fig.14 yes Figure 1 A three-dimensional diagram of the semi-external water jacket of the electric pump (omitted the external guide fin);

[0053] Fig.15 yes Figure 1 A schematic diagram of a front view of a semi-external water jacket of an electric pump;

[0054] Fig.16 yes Figure 1 A three-dimensional diagram of the second half of the outer water jacket of the electric pump (the second outer guide fin is omitted);

[0055] Fig.17 yes Figure 1 Schematic diagram of the second main view of the semi-external water jacket of the electric pump;

[0056] Fig.18 is along Figure 3 The A cut circle shows a schematic diagram of the inner peripheral flow channel of the inner peripheral cylindrical surface of the tubular heater (the inner guide fins are omitted to show the streamline of the inner peripheral flow channel);

[0057] Fig.19 is along Figure 3 The A' section circle shows a schematic diagram of the outer peripheral flow channel unfolded from the inner peripheral cylindrical surface of the outer cylindrical base (the outer guide fins are omitted to show the streamlines of the outer peripheral flow channel).

[0058] Reference numerals:

[0059] Stator assembly 10;

[0060] Impeller rotor assembly 20;

[0061] Pump cover 30, pump cap 31, pump cover shell 32;

[0062] Pump body 40, bottom plate 41, inner housing (motor housing) 42, mounting base surface 401, axial flow guide fins 421;

[0063] Shielding sleeve 50;

[0064] A cylindrical heater 60, and an inner cylindrical surface 61 of the cylindrical heater;

[0065] Lead out the wire sealing cover 65;

[0066] Inner water jacket 70, inner cylindrical base 71, inner peripheral baffle 72, inner guide fin 73, annular end surface 74, upper water trough 75, lower water trough 76;

[0067] Outer water jacket 80, half outer water jacket one 80a, half outer water jacket two 80b,

[0068] The outer cylindrical base 81, the semi-outer cylindrical base 1 81a, the semi-outer cylindrical base 2 81b, the outer cylindrical base inner peripheral cylindrical surface 811

[0069] Peripheral partition 82, peripheral partition one 82a, peripheral partition two 82b,

[0070] External guide fins 83, external guide fin one 83a, external guide fin two 83b;

[0071] Cavity 90, outer cavity 91, inner cavity 92, inner cavity 1 93, inner cavity 2 94, outer flow channel 911, outer guide groove 912, inner flow channel 931, inner guide groove 932, axial flow channel 941;

[0072] Snail chamber 99;

[0073] Pump housing (pump cover housing + outer cylindrical base) 3281. DETAILED DESCRIPTION

[0074] The electric pump of the embodiment of the present invention is an improved design based on the applicant's prior designs CN114060288A, CN202122621949.1 and CN114151385A. The main points of improvement are: installation, matching structure, flow channel design, etc. of the heating component main body and the pump body, the purpose is to further reduce trapped air, improve heat transfer efficiency, increase liquid cooling and heat dissipation of the motor, and simplify the manufacturing process. In each embodiment, for designs not mentioned, see the applicable contents in CN114060288A, CN202122621949.1 and CN114151385A.

[0075] In order to facilitate the understanding of the present invention, the present invention will be described more fully below in conjunction with the embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. The terms "upper" and "lower" are used to refer to the orientation of the upper and lower parts of the present invention. Figure 3 As shown in the figure, the installation base is facing “up”, the opposite direction is “down”, and the “clockwise” and “counterclockwise” directions are as follows: Figure 3 The perspective shown, Figure 6 As shown, the direction of the suction port is "front" and the opposite direction is "rear". Upstream refers to the part of the process that is relatively closer to the source, and there is no strict boundary between the source and the midstream; downstream refers to the part of the process that is relatively closer to the outlet, and there is no strict boundary between the midstream and the outlet. Please refer to the 2000 edition of "Cihai" published by Shanghai Dictionary Publishing House.

[0076] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0077] Example

[0078] This embodiment is a basic implementation of a horizontal canned pump for an electric pump used in an electric vehicle power thermal management system, including a motor, a pump head, and a heating component, such as Figure 1 , 2 , 6 , specifically includes a stator assembly 10 , an impeller rotor assembly 20 , a pump cover 30 , a pump body 40 , a shielding sleeve 50 , a cylindrical heater 60 , an inner water jacket 70 , an outer water jacket 80 , and a lead-out wire sealing cover 65 .

[0079] like Figure 1 , 3 6, the motor and pump head parts are similar to the embodiment of CN114151385A. Similarly, the pump cover 30 is formed with a pump cover 31 and a cylindrical pump cover shell 32 protruding from the outer edge of the pump cover 31. The pump body 40 is as shown in Fig. 9 A substantially annular bottom plate 41, a mounting base surface 401 on the outer periphery of the bottom plate, a cylindrical inner shell 42 protruding from the inner ring edge of the bottom plate 41, and a plurality of axial guide fins 421 arranged along the circumferential direction of the outer cylindrical surface of the inner shell 42 extend along the pump shaft direction. The shielding sleeve 50 and the inner shell 42 enclose a stator cavity to accommodate the stator assembly 10. Surrounding the outer periphery of the stator cavity are the annular bottom plate 41 and the cylindrical inner shell 42 of the pump body 40, the pump cover 31 of the pump cover 30, and the cylindrical pump cover outer shell 32, which are connected to enclose a cavity 90 along the pump shaft annular column for accommodating a heating assembly consisting of a tubular heater 60 and an inner water jacket 70 and an outer water jacket 80 (described later for details). The end of the cavity 90 located at the pump cover 31 is called the first end, and the end located at the base plate 42 is called the second end. The rotor and stator assembly 10 constitute an electric motor, with the inner housing 42 serving as the motor housing. The coaxially driven impeller drives the liquid in the impeller chamber enclosed by the pump cover 31 and the shielding sleeve 50 through the volute chamber 99 to flow into the cavity 90.

[0080] The heating component and flow channel part are similar to the CN202122621949.1 embodiment, including: a cylindrical heater 60, a lead-out wire sealing cover 65, an inner water jacket 70, an outer water jacket 80, and the pump cover 30 and the portion of the pump body 40 facing the cavity 90.

[0081] like Figure 10-12 As shown, the inner water jacket 70 has an inner cylindrical base 71, and an inner peripheral baffle 72 and a plurality of inner guide fins 73 are integrally formed around the outer peripheral cylindrical surface of the inner cylindrical base 71, and the inner guide fins 73 are in the same direction as the inner peripheral baffle 72; at the first end of the cavity 90, the inner cylindrical base 71 extends inwardly to form an annular end face 74, and a plurality of upper water grooves 75 are provided along the circumferential direction of the annular end face; at the second end of the cavity 90, a plurality of lower water grooves 76 are provided along the circumferential direction of the inner cylindrical base 71.

[0082] like Figure 3 , 13 As shown in Figure 17, the outer water jacket 80 has a cylindrical outer cylindrical base 81, and an outer peripheral baffle 82 and a plurality of outer guide fins 83 are arranged around the inner peripheral cylindrical surface 811 of the outer cylindrical base. The outer guide fins 83 are aligned with the outer peripheral baffle 82. A plane K passing through the pump shaft is drawn to divide the outer water jacket 80 into a half outer water jacket 1 80a and a half outer water jacket 2 80b. At the same time, the outer cylindrical base 81 is divided into a half outer cylindrical base 1 81a and a half outer cylindrical base 2 81b. The outer peripheral baffle 82 is arranged on the inner peripheral cylindrical surface 811 of the outer cylindrical base. The outer water jacket 80a is cut into two parts, namely, the outer water jacket 80a is cut into two parts, namely, the outer water jacket 80a is cut into two parts, namely, the outer water jacket 80b ...

[0083] The pump cover 31 of the pump housing 30 and the bottom plate 41 of the pump body 40 are each provided with a rib groove and a fence structure on one side facing the cavity 90 for enclosing a water channel with adjacent components, and play a role in connecting and transferring the flow channel system described later, wherein, Fig. 9 As shown, an annular rib is provided at one end of the bottom plate 41 facing the cavity 90 for fitting with the end surface of the tubular heater 60 , and a notch 411 is formed in the annular rib.

[0084] like Figure 1 , 3As shown in Figure 6, the heating component is mounted on the electric pump: first, the cylindrical heater 60 is mounted in the cavity 90 and fixed to the bottom plate 41 of the pump body 40, and then the lead-out wire sealing cover 65 is installed and fixed, the inner water jacket 70 is sleeved on the inner periphery of the cylindrical heater 60 and snapped into the bottom plate 41, and the semi-outer water jacket 1 80a and the semi-outer water jacket 2 80b are sequentially sleeved on the outer periphery of the cylindrical heater 60 and snapped into the bottom plate 41, and the two are spliced ​​into a complete outer water jacket 80 on the plane K, and finally the pump cover 30 is sleeved on the outer periphery of the outer cylindrical base 81 of the outer water jacket 80, and then it is tightly sealed to the pump body 41.

[0085] After installation, on the periphery of the motor, the pump cover 30 and the pump body 40 are connected to enclose a cavity 90, the pump cover 31 of the pump cover and the bottom plate 41 of the pump body constitute the two ends of the cavity 90, the pump cover outer shell 32 and the outer cylindrical base 81 of the outer water jacket are combined into a cylindrical pump outer shell 3281 to constitute the outer periphery of the cavity 90, and the inner shell 42 of the pump body constitutes the inner periphery of the cavity 90.

[0086] The cartridge heater 60 is built into the cavity 90 and is located between the outer periphery and the inner periphery of the cavity 90 along the pump axis, thereby dividing the cavity 90 into an outer periphery cavity 91 and an inner periphery cavity 92 .

[0087] The outer water jacket 80 is assembled into the outer water jacket 80 by the semi-outer water jacket 1 80a and the semi-outer water jacket 2 80b and is built in the cavity 90. The outer peripheral partition plate 82 and the cylindrical heater 60 are enclosed around the inner peripheral cylindrical surface 811 of the outer cylindrical base, and the outer peripheral cavity 91 is divided into an outer peripheral flow channel 911 around the outer peripheral cylindrical surface of the cylindrical heater 60. The downstream is connected to the discharge port of the pump through the water channel enclosed by the rib plate and the fence on the pump cover 31. In the outer peripheral flow channel 911, a plurality of outer guide fins 83 are formed around the inner peripheral cylindrical surface 811 of the outer cylindrical base to form a plurality of outer guide grooves 912 (such as Figure 5 shown).

[0088] The inner water jacket 70 is built in the inner peripheral cavity 92. The inner cylindrical base 71 of the inner water jacket 70 is located between the outer periphery and the inner periphery of the inner peripheral cavity 92 along the axial direction of the pump shaft, and the inner peripheral cavity 92 is divided into an inner peripheral cavity 1 93 and an inner peripheral cavity 2 94. The inner peripheral cavity 1 93 is located between the outer peripheral cavity 91 and the inner peripheral cavity 2 94.

[0089] The inner peripheral partition plate 72 and the cylindrical heater 60 surrounding the outer peripheral surface of the inner cylindrical base 71 are enclosed to divide the inner peripheral cavity 93 into an inner peripheral flow channel 931, the upstream of which is connected to the volute chamber 99 through the rib plate and the water channel surrounded by the fence on the pump cover 31, and the downstream is connected to the upstream of the outer peripheral flow channel 911 through the notch 411 on the bottom plate 41. In the inner peripheral flow channel 931, a plurality of inner guide fins 83 on the outer peripheral surface of the inner cylindrical base 71 are used to form a plurality of inner guide grooves 932 (such as Figure 4 shown).

[0090] The inner shell 42 of the pump body and the multiple axial guide fins 421 on its outer cylindrical surface and the inner cylindrical base 71 enclose the inner peripheral cavity 94 to divide it into multiple axial flow channels 941, which are connected one by one with the multiple upper water grooves 75 opened along the circumferential direction of the annular end face 74 and the multiple lower water grooves 76 opened along the circumferential direction of the inner cylindrical base 71; at the first end of the cavity 90, the outer cylindrical surface of the inner shell 42 encloses the upper water grooves 75 to form a through hole that is connected to the water channel enclosed by the ribs and fences on the inner shell 42, the water-blocking sleeve 50 and the pump cover 31 and leads to the volute chamber 99; at the second end of the cavity 90, the bottom plate 41 abuts the lower water grooves 76 to form a through hole that is connected to the downstream of the inner peripheral flow channel 931 and then to the upstream of the outer peripheral flow channel 911.

[0091] The pump liquid communication path for achieving heating is, in sequence: the pump suction port - impeller - volute chamber 99 - inner flow channel 931 - the notch 411 of the annular rib plate on the bottom plate - outer flow channel 911 - the pump discharge port, and heating is achieved through the inner and outer surfaces of the tubular heater 60. Only one inner flow channel and one outer flow channel are arranged, and the direction is changed only once at the notch 411 at one end of the bottom plate of the cavity, thereby avoiding the repeated reversal of several sections of spiral flow channels in the prior designs CN114060288A and CN202122621949.1, and the rapid change in flow direction, resulting in uneven flow velocity distribution, local high temperature and trapped air problems. Several guide fins form several narrower guide grooves in the flow channel, which guide the pump liquid evenly along the two sides and the center of the flow channel, and there will be no low flow on the left or right bank of the flow channel, resulting in too slow heat transfer in that part, thereby causing local high temperature or trapped air.

[0092] The pump liquid connection path for realizing motor heat dissipation is as follows: pump suction port - impeller - volute chamber 99 - multiple upper water grooves 75 - multiple axial flow channels 941 - multiple lower water grooves 76 - peripheral flow channels 911 - pump discharge port. The multiple axial flow channels 941 in the inner peripheral cavity 94 are adjacent to the motor housing. After the pump liquid in the flow channel contacts the heat of the motor housing and heats up, it flows into the peripheral flow channel 911 and is discharged through the discharge port of the electric pump, taking away the heat of the motor. The heat dissipation effect is good and it is especially suitable for electric vehicles to be used in high temperature environments in summer. In particular, the annular inner peripheral cavity 94 is divided into multiple axial flow channels 941, and the liquid flow is evenly guided on the outer cylindrical surface of the motor housing, and the motor dissipates heat evenly and efficiently.

[0093] Here, the upper / lower water troughs 75 / 76 can be configured as grooves for liquid flow to pass through, or can be configured as through holes for liquid flow to pass through, as long as they play the role of connecting the axial flow channel and the volute water channel or the peripheral flow channel 911.

[0094] like Figure 1 , 3-6, 18, and 19, the design of the peripheral flow channel 911: the maximum geometric radius of the peripheral cavity 91 is defined as r0, and a vertical plane V passing through the pump shaft is drawn. The intersection line L with the inner cylindrical surface 811 of the outer cylindrical base 81 is the uppermost generatrix of the peripheral cavity 91. The generatrix L is defined as the liquid flow starting end E at a position 15° counterclockwise along the cylindrical surface upstream of the peripheral flow channel 911, and the generatrix L is defined as the liquid flow ending end F at a position 15° clockwise along the cylindrical surface downstream of the peripheral flow channel 911. The peripheral partition 82 is formed by connecting several sections of spiral partitions with different rise angles. Fig.19 A plane W perpendicular to the pump axis is drawn on the unfolded view of the inner peripheral cylindrical surface 811 of the outer cylindrical base, indicating that the helical rise angle α of the outer peripheral baffle 82 controls the direction of the liquid flow. Assuming that the flow rate in the outer peripheral flow channel 911 is Q, the cross-sectional area is S, and the flow velocity in the flow channel is v=Q / S, the direction of the outer peripheral baffle 82 controls the liquid flow trajectory (i.e., the displacement curve), and its curvature radius is r, and the centrifugal acceleration a=v 2 / r, in order for the liquid flow to overcome the gravitational acceleration g and thus smoothly climb over the highest position of the peripheral cavity 91, it is necessary to ensure that a = v 2 / r>g, that is, Q 2 / (S 2*r)>g, and increase the centrifugal acceleration a as much as possible. In the typical design of CN114060288A with three sections of peripheral spiral flow channels, each flow channel only goes around 120° around the circumference, and the rise angle α is greater than 30°; in contrast, this embodiment uses a flow channel that goes around the circumference for more than 360°, and adjusts the peripheral baffle 82 from E to F to tilt toward plane W, so that the rise angle α of this section of the peripheral baffle 82 is less than 20°, guiding the velocity vector of the liquid flow in the uppermost area along the circumferential direction of the peripheral cavity to increase and the velocity vector along the pump shaft direction to decrease, so that r decreases and a increases, so that a exceeds g more, so that the liquid flow can climb more smoothly over the highest section EF position of the peripheral cavity 91 and flush away the gas in the flow channel, correspondingly, the peripheral baffle 82 away from the uppermost area can be adjusted to tilt toward the busbar direction, and the velocity vector of the liquid flow in the corresponding area along the pump shaft direction is appropriately increased, which has no effect on the liquid flow passing the highest point. This embodiment selects the most favorable situation, taking α=0° between E and F, the outer peripheral baffle 82 in the uppermost area is perpendicular to the generatrix, and the curvature radius r of the liquid flow trajectory is equal to the maximum geometric radius r0 of the outer peripheral cavity 91. Under the condition of the same flow rate, a reaches the maximum value, and the effect is best. The typical design of CN114060288A is that the spiral flow channel is divided into 3 sections, and each flow channel only goes around the circumference for 120°, and it is impossible to make such a large adjustment to the inclination of the baffle. Similarly, when designing the inner peripheral flow channel 931, the intersection line L' of the plumb plane V and the inner peripheral cylindrical surface 61 of the tubular heater is the uppermost generatrix of the inner peripheral cavity 92. The generatrix L' is defined as the starting end E' of the liquid flow at 15° counterclockwise along the cylindrical surface upstream of the inner peripheral flow channel 931, and the generatrix L' is defined as the ending end F' of the liquid flow at 15° clockwise along the cylindrical surface downstream of the inner peripheral flow channel 931. The inner peripheral baffle 72 is also formed by connecting several sections of spiral baffles with different rise angles. Fig.18 A plane W' perpendicular to the pump axis is drawn on the development diagram of the inner peripheral cylindrical surface 61 of the tubular heater, indicating that the spiral angle β of the inner peripheral partition 72 controls the direction of the liquid flow. The design of the spiral angle β is similar to that of α. In this embodiment, the most favorable situation of β = 0° is also selected between E' and F'. Of course, if β is less than 20° between E' and F', the centrifugal acceleration a of the liquid flow at the highest position of the inner peripheral cavity can be made to exceed the gravity acceleration g more, so that it can climb more smoothly over the highest section E'F' and flush away the gas in the flow channel.

[0095] In response to the space occupied by the lead-out wire sealing cover 65 in the cavity 90 along its busbar, the peripheral flow channel 911 can be offset along the busbar direction to avoid it. The cylindrical surface of the tubular heater 60 sealed by the wire sealing cover 65 is not equipped with a heating wire, and there is no need to consider the local high temperature problem caused by uneven flow and uneven heat transfer, and the inner and outer guide fins can be interrupted.

[0096] The axial guide fins are removed from the outer cylindrical surface of the inner shell, and the annular end face, upper water trough and lower water trough of the inner water jacket are removed. After the inner shell of the pump body is expanded outward, it fits with the inner cylindrical base of the inner water jacket, and the second inner peripheral flow channel is removed. This is suitable for the situation where the outer diameter of the motor increases and the flow channel needs to be cancelled, and more parts can be shared with the basic design.

[0097] In the description of the present invention, unless otherwise specified, the "multiple or several" in "multiple segments, multiple, multiple slices, several tracks" means two or more.

[0098] The above-mentioned embodiments and design examples only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention. For example, the cylindrical heater, inner cylindrical base, and outer cylindrical base suitable for embracing a cylindrical motor housing in the embodiments and design examples are most compact in the form of a circular cylinder. If the cylindrical surface of the motor being embraced is a prism, it is best to change it to a non-circular circular cylinder such as a rounded rectangle, and the heater is also preferably a similar non-circular cylinder. These all fall within the scope of protection of the present invention.

Claims

1. An electric pump for an electric vehicle power thermal management system, the pump being a horizontal canned electric pump, comprising: - an electric motor having a cylindrical motor housing (42) and an axially driven impeller driving a pump liquid in a volute (99); - A cylindrical pump housing (3281) is roughly coaxially sleeved on the outer periphery of the motor housing (42), and a cavity (90) surrounding the motor housing (42) is provided between the pump housing and the motor housing, and the cavity (90) is in the shape of an annular cylinder in the axial direction; - a cylindrical heater (60) built into the cavity (90) for heating the pump liquid, and located between the outer periphery and the inner periphery of the cavity (90) along the axial direction, dividing the cavity (90) into an outer periphery cavity (91) and an inner periphery cavity (92); Features: - a peripheral partition plate (82) is disposed around the peripheral cavity (91) to divide the peripheral cavity (91) into a peripheral flow channel (911) around the periphery of the cylindrical heater (60); - an inner peripheral partition plate (72) is disposed around the inner peripheral cavity to divide the inner peripheral cavity into an inner peripheral flow channel (931) that runs around the inner periphery of the cylindrical heater (60); - at one end of the cavity (90) along the axial direction, the upstream of the outer peripheral flow channel (911) is connected to the downstream of the inner peripheral flow channel (931); at the other end of the cavity (90) along the axial direction, the downstream of the outer peripheral flow channel (911) leads to the discharge port of the electric pump, and the upstream of the inner peripheral flow channel (931) leads to the volute chamber (99); - the pump liquid output from the volute chamber (99) passes through the above two flow passages and is discharged through the discharge port of the electric pump; - also includes an outer water jacket (80) built into the outer peripheral cavity (91), an inner water jacket (70) built into the inner peripheral cavity (92), the outer peripheral baffle (82) and the outer water jacket (80) are integrally formed by injection molding, and the inner peripheral baffle (72) and the inner water jacket (70) are integrally formed; The peripheral partition (82) is formed by connecting one or more sections of spiral partitions with different pitch angles. The position of the topmost generatrix L of the cylindrical surface of the peripheral cavity (91) at 15° counterclockwise along the cylindrical surface toward the upstream of the peripheral flow channel (911) is defined as the starting end E of the liquid flow. The position of the topmost generatrix L of the cylindrical surface of the peripheral cavity (91) at 15° clockwise along the cylindrical surface toward the downstream of the peripheral flow channel (911) is defined as the ending end F of the liquid flow. The spiral pitch angle α of the peripheral partition (82) located between EF is less than 20°, so as to reduce the curvature radius of the liquid flow movement trajectory in the peripheral flow channel (911); and / or, ——The inner peripheral partition (72) is formed by connecting one or more sections of spiral partitions with different pitch angles. The top generatrix L' of the inner peripheral cavity cylinder is defined as the starting end E' of the liquid flow at a position 15° counterclockwise along the cylinder toward the upstream of the inner peripheral flow channel (931), and the top generatrix L' of the inner peripheral cavity cylinder is defined as the ending end F' of the liquid flow at a position 15° clockwise along the cylinder toward the downstream of the inner peripheral flow channel (931). The spiral pitch angle β of the inner peripheral partition (72) located between E'F' is less than 20°, so as to reduce the curvature radius of the liquid flow movement trajectory in the inner peripheral flow channel.

2. The electric pump according to claim 1, characterized in that: The peripheral flow channel (911) is provided with a plurality of external guide fins (83) that are aligned with the peripheral baffle (82) to form a plurality of external guide grooves (912); The inner peripheral flow channel is provided with a plurality of inner guide fins (73) which are aligned with the inner peripheral partition plate (72) to form a plurality of inner guide grooves (932).

3. The electric pump according to claim 1, characterized in that: Also includes: - Pump cover (30): formed with a pump cover (31) and a cylindrical pump cover shell (32) protruding from the outer edge of the pump cover; - Pump body (40): formed with a substantially annular bottom plate (41) and a cylindrical inner shell (42) protruding from the inner ring edge of the bottom plate; The outer water jacket (80) has a cylindrical outer cylindrical base (81), which is divided into a semi-outer water jacket 1 (80a) and a semi-outer water jacket 2 (80b) along a plane K passing through the axial direction, and the two are assembled into a complete outer water jacket (80). The outer peripheral baffle (82) is divided into two parts by the plane K, namely, an outer peripheral baffle 1 (82a) and an outer peripheral baffle 2 (82b). The outer peripheral baffle 1 (82a) and the semi-cylindrical base 1 (81a) are integrally formed to form the semi-outer water jacket 1 (80a), and the outer peripheral baffle 2 (82b) and the semi-cylindrical base 2 (81b) are integrally formed to form the semi-outer water jacket 2 (80b); The cavity (90) is formed by the pump cover (30) and the pump body (40) at the two ends of the motor being connected and enclosed. The pump cover (31) of the pump cover and the bottom plate (41) of the pump body constitute the two ends of the cavity (90). The pump cover outer shell (32) constitutes the outer periphery of the cavity (90) and becomes a part of the pump outer shell (3281). The inner shell (42) of the pump body constitutes the inner periphery of the cavity (90) and becomes the motor shell. The outer cylindrical base (81) fits the pump cover outer shell (32) and is combined into the pump outer shell (3281).

4. The electric pump according to claim 3, characterized in that: The outer peripheral flow channel (911) is provided with a plurality of outer guide fins (83) running in the same direction as the outer peripheral baffle (82) to form a plurality of outer guide grooves (912). The plurality of outer guide fins (83) are divided into two parts by the plane K, namely, an outer guide fin one (83a) and an outer guide fin two (83b). The outer guide fin one (83a), the outer peripheral baffle one (82a) and the semi-cylindrical base one (81a) are integrally formed to form the semi-outer water jacket one (80a), and the outer guide fin two (83b), the outer peripheral baffle two (82b) and the semi-cylindrical base two (81b) are integrally formed to form the semi-outer water jacket two (80b).

5. The electric pump according to claim 1, characterized in that: The inner water jacket (70) has a cylindrical inner cylindrical base (71) which is located between the outer periphery and the inner periphery of the inner periphery cavity (92) along the axial direction, and divides the inner periphery cavity (92) into an inner periphery cavity 1 (93) and an inner periphery cavity 2 (94), wherein the inner periphery cavity 1 (93) is located between the outer periphery cavity (91) and the inner periphery cavity 2 (94); - the inner peripheral partition plate (72) is only arranged in the inner peripheral cavity one (93), dividing the inner peripheral cavity one (93) into the inner peripheral flow channel (931); - At one end of the cavity (90) along the axial direction, the upstream of the outer peripheral flow channel (911) is connected to the inner peripheral cavity 2 (94), and at the other end of the cavity (90), the inner peripheral cavity 2 (94) is connected to the volute chamber (99).

6. The electric pump according to claim 5, characterized in that: Also includes: - Pump cover (30): formed with a pump cover (31) and a cylindrical pump cover shell (32) protruding from the outer edge of the pump cover; - Pump body (40): formed with a substantially annular bottom plate (41), a cylindrical inner shell (42) protruding from the inner ring edge of the bottom plate, and a plurality of axial flow guide fins (421) arranged along the circumferential direction of the outer cylindrical surface of the inner shell (42) and extending along the axial direction; The cavity (90) is formed by the pump cover (30) and the pump body (40) at the two ends of the motor being connected and enclosed, the pump cover (31) of the pump cover and the bottom plate (41) of the pump body forming the two ends of the cavity (90), the pump cover outer shell (32) forming the outer periphery of the cavity (90) and forming the pump outer shell, and the inner shell (42) of the pump body forming the inner periphery of the cavity (80) and forming the motor shell; The inner shell (42) and the plurality of axial flow guide fins (421) on its outer periphery are enclosed by the inner cylindrical base (71) to divide the inner peripheral cavity 2 (94) into a plurality of axial flow channels (941); The inner peripheral partition plate (72) is arranged around the outer peripheral cylindrical surface of the inner cylindrical base (71) and is integrally formed to form the inner water jacket (70); At the first end of the cavity (90), the inner cylindrical base (71) extends inwardly to form an annular end face (74), and the annular end face is provided with a plurality of upper water grooves (75) along the circumference for connecting with the volute chamber (99); at the second end of the cavity (90), the inner cylindrical base (71) is provided with a plurality of lower water grooves (76) along the circumference for connecting with the upstream of the peripheral flow channel (911); the plurality of upper water grooves (75), the plurality of lower water grooves (76) and the plurality of axial flow channels (941) are connected in a one-to-one correspondence.

7. The electric pump according to claim 6, characterized in that: The inner peripheral flow channel (931) is provided with a plurality of inner guide fins (73) running in the same direction as the inner peripheral baffle (72) to form a plurality of inner guide grooves (932); the inner guide fins (73), the inner peripheral baffle (72) and the inner cylindrical base (71) are integrally formed to form the inner water jacket (70).

8. The electric pump according to claim 1, characterized in that: The helix angle α of the outer peripheral partition (82) located between EF=0° and / or the helix angle β of the inner peripheral partition (72) located between E'F'=0°.

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