Heat dissipation structure for shield motor, shield motor and shield pump

Abstract

The invention provides a heat dissipation structure for a shield motor, the shield motor and a shield pump, and the heat dissipation structure comprises a stator projection which axially extends along the inner side of a stator iron core and forms a heat dissipation flow channel with the stator iron core; the heat dissipation gap is arranged between the rotor and the plastic shell wrapping the stator iron core; and two ends of the heat dissipation connecting pipe are respectively connected with the heat dissipation flow channel and the heat dissipation gap. According to the technical scheme provided by the embodiment of the invention, under the condition that the stator iron core is wrapped by the plastic shell, the plurality of stator bulges are additionally arranged on the inner side of the stator iron core to form the heat dissipation flow channel, so that a cooling medium flows into the heat dissipation connecting pipe through the heat dissipation flow channel, further flows into the heat dissipation gap between the rotor and the stator iron core and flows out of the shielding motor; therefore, heat dissipation of the stator iron core and the rotor is achieved, and normal use of the shield motor and even the shield pump is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of shielded motor heat dissipation, and in particular to a heat dissipation structure for a shielded motor, a shielded motor and a shielded pump. Background Art

[0002] Shielded motors are usually used in liquid medium circulation situations because they have better sealing than motors used in other water pumps. Usually, shielded motors use metal casings to reduce the risk of liquid leakage. However, in some scenarios where the motor is required to be lightweight, such as automotive circulating cooling systems, the aforementioned metal casing will cause the motor to be too heavy overall. In this case, the usual solution is to use a plastic casing instead of a metal casing to ensure the lightness of the motor.

[0003] However, the above-mentioned plastic shell will also reduce the overall heat dissipation of the shielded motor. This is because the thermal conductivity of the plastic material is poor. Therefore, for the shielded motor using a plastic shell, a structure that can effectively reduce the temperature is required to ensure the performance and service life of the motor. Summary of the invention

[0004] The present invention provides a heat dissipation structure for a shielded motor, a shielded motor and a shielded pump, aiming to solve the problem of poor heat dissipation effect caused by the shielded motor using a plastic shell.

[0005] In a first aspect, an embodiment of the present invention provides a heat dissipation structure for a shielded motor, comprising:

[0006] The stator protrusion extends axially along the inner side of the stator core and forms a heat dissipation channel with the stator core;

[0007] A heat dissipation gap is provided between the rotor and the plastic shell that wraps the stator core;

[0008] The heat dissipation connecting pipe has two ends respectively connected to the heat dissipation channel and the heat dissipation gap.

[0009] Optionally, the cross section of the heat dissipation channel is a semicircular structure; the cross section of the heat dissipation connecting pipe is a semicircular structure.

[0010] Optionally, the heat dissipation connecting pipe is fixedly connected to the heat dissipation channel and the heat dissipation gap.

[0011] Optionally, the heat dissipation connecting pipe is detachably connected to the heat dissipation channel and the heat dissipation gap.

[0012] Optionally, the heat dissipation connecting pipe has an arc-shaped structure.

[0013] In a second aspect, an embodiment of the present invention provides a shielded motor, which adopts the heat dissipation structure provided in the first aspect, including:

[0014] The stator core has a plurality of teeth extending toward the axis on the inner side, and the teeth are wound with windings;

[0015] Plastic shell, wrapped around the stator core and the outside of the winding;

[0016] The rotor is arranged inside the stator core and is coaxial with the axis of the stator core; a heat dissipation gap is arranged between the rotor and the plastic shell.

[0017] Optionally, stator protrusions are provided between adjacent teeth.

[0018] Optionally, the rotor is a circular ring-shaped permanent magnet.

[0019] Optionally, the rotor has four-pole magnetic poles; adjacent magnetic poles are opposite poles and the angle between them is 90 degrees.

[0020] In a third aspect, an embodiment of the present invention provides a canned motor pump using the canned motor provided in the second aspect.

[0021] The embodiments of the present invention provide a heat dissipation structure for a shielded motor, a shielded motor and a shielded pump, wherein the heat dissipation structure adds a plurality of stator protrusions on the inner side of the stator core to form a heat dissipation channel when the stator core is wrapped by a plastic shell, so that the cooling medium flows into the heat dissipation connecting pipe through the heat dissipation channel, and further flows into the heat dissipation gap between the rotor and the stator core and flows out of the shielded motor, thereby dissipating the heat of the stator core and the rotor, ensuring the normal use of the shielded motor and even the shielded pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a heat dissipation structure for shielding a motor provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a heat dissipation structure for shielding a motor provided by an embodiment of the present invention;

[0024] Figure 3 A magnetic field distribution diagram of a rotor in a shielded motor provided by an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the operation of a heat dissipation structure in a shielded motor provided by an embodiment of the present invention.

[0026] In the figure: 1. stator protrusion; 2. stator core; 3. heat dissipation channel; 4. heat dissipation gap; 5. rotor; 6. plastic shell; 7. heat dissipation connecting pipe; 8. tooth part; 9. winding. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] Existing shielded motors use metal casings to reduce the risk of liquid leakage. However, in some scenarios where the motor needs to be lightweight, such as automotive circulating cooling systems, the aforementioned metal casing will cause the motor to be too heavy as a whole. In this case, the usual solution is to use a plastic casing instead of a metal casing to ensure the lightness of the motor.

[0029] However, the above-mentioned plastic shell will also reduce the overall heat dissipation of the shielded motor. This is because the thermal conductivity of the plastic material is poor. Therefore, for the shielded motor using a plastic shell, a structure that can effectively reduce the temperature is required to ensure the performance and service life of the motor.

[0030] Embodiment 1

[0031] In view of the above shortcomings, the present invention proposes a heat dissipation structure for shielding a motor, such as Figure 1 and Figure 2 As shown, including:

[0032] The stator protrusion 1 extends axially along the inner side of the stator core 2 and forms a heat dissipation channel 3 with the stator core 2; the stator protrusion 1 can be a structure integrally formed with the stator core 2, or can be formed by post-processing. The purpose is to form a heat dissipation channel 3 between the stator protrusion 1 and the stator core 2. The function of the channel is to introduce a cooling medium, which can be a coolant or a gas, so as to reduce the temperature of the winding 9 around the stator and wound around the stator core 2.

[0033] The heat dissipation gap 4 is provided between the rotor 5 and the plastic shell 6 that wraps the stator core 2; it should be noted that the plastic shell 6 not only wraps the stator core 2, but also wraps the winding 9 wound around the stator core 2 to achieve the purpose of sealing. The heat dissipation gap provided here is to be smaller than the actual electrical gap, in order to allow the cooling medium to flow to take away the heat.

[0034] The heat dissipation connecting pipe 7 has two ends respectively connected to the heat dissipation channel 3 and the heat dissipation gap 4. The connection method can be a fixed connection or a detachable connection, and a tight connection with the heat dissipation channel 3 needs to be achieved. For example, the cross section of the heat dissipation channel 3 is a semicircular structure; the cross section of the heat dissipation connecting pipe 7 is a corresponding semicircular structure.

[0035] The heat dissipation connecting pipe 7 is preferably made of metal material to facilitate shaping, and the structure adopted is based on facilitating the flow of the cooling medium, such as an arc structure; this is also beneficial to the stability of the heat dissipation connecting pipe 7, and injection molding will also be performed after shaping. The plastic shell 6 is provided with an opening, which is connected to the heat dissipation connecting pipe 7, so as to achieve communication with the heat dissipation flow channel 3.

[0036] A heat dissipation structure for a shielded motor provided in an embodiment of the present invention, when the stator core is wrapped by a plastic shell, a plurality of stator protrusions are added on the inner side of the stator core to form a heat dissipation channel, so that a cooling medium flows into the heat dissipation connecting pipe through the heat dissipation channel, and further flows into the heat dissipation gap between the rotor and the stator core and flows out of the shielded motor, thereby dissipating the heat of the stator core and the rotor, ensuring the normal use of the shielded motor.

[0037] Embodiment 2

[0038] The embodiment of the present invention further proposes a shielded motor based on the first embodiment, and the shielded motor includes:

[0039] The stator core 2 has a plurality of teeth 8 extending toward the axis on the inner side, and a stator protrusion 1 is provided between adjacent teeth 8. The teeth 8 are wound with windings 9;

[0040] A plastic shell 6, wrapped around the stator core 2 and the outer side of the winding 9;

[0041] The rotor 5 is arranged inside the stator core 2 and is coaxial with the axis of the stator core 2 ; a heat dissipation gap 4 is provided between the rotor 5 and the plastic shell 6 .

[0042] In a preferred embodiment, the rotor 5 uses an annular permanent magnet; by adopting the sinusoidal magnetization technology, the annular permanent magnet can be set to a quadrupole magnetic pole; the adjacent magnetic poles are opposite magnetic poles and the angle is 90 degrees, such as Figure 3 As shown, the direction of the magnetic field is from level S to level N; during the rotation of the rotor 5, a sinusoidal magnetic field distribution is presented to the stator core 2, but a zero magnetic field distribution is presented to the inside of the rotor 5, which also means that the annular permanent magnet does not need to use the rotor 5 core, and no heat loss is generated.

[0043] Furthermore, Figure 4As shown, the heat dissipation process of the above-mentioned shielded motor is as follows: when the shielded motor is started, the cooling medium enters the heat dissipation channel 3 through the through hole at one end of the plastic shell 6 wrapped by the shielded motor, and the through hole is the starting position of the heat dissipation channel 3. The cooling medium flows through the axial distance of the shielded motor and flows into the heat dissipation connecting pipe 7 at the other end of the shell, and in this process, the stator core 2 and the winding 9 are cooled; the heat dissipation connecting pipe 7 is not limited to the use of metal materials, and it will also be injection molded after the heat dissipation gap 4 and the stator protrusion 1 are fixedly connected to increase the service life; the heat dissipation medium flows into the heat dissipation gap 4 through the heat dissipation connecting pipe 7, and this gap is used to flow the heat dissipation medium out of the shielded motor, and the size of the gap is smaller than the actual electrical air gap of the motor; in this process, the heat dissipation medium cools the rotor 5.

[0044] It should also be added that, since the shielded motor is a three-phase motor, in a preferred embodiment, the above-mentioned tooth portions 8 are set to 6, corresponding to 6 three-phase windings 9, so a total of 6 stator protrusions 1, heat dissipation gaps 4 and heat dissipation connecting pipes 7 are provided between the tooth portions 8; at the same time, an interval setting can also be adopted between the tooth portions 8, and a total of 3 stator protrusions 1, heat dissipation gaps 4 and heat dissipation connecting pipes 7 are provided.

[0045] The shielded motor used in the embodiment of the present invention is obtained on the basis of the above-mentioned embodiment, has the same technical conception, and achieves the same technical effect, which will not be described in detail here.

[0046] Embodiment 3

[0047] An embodiment of the present invention provides a canned pump, which adopts the canned motor provided by the above-mentioned embodiment to ensure heat dissipation so that the canned pump can work normally, which will not be described in detail here.

[0048] Some directional words are defined in the present invention. Unless otherwise specified, the directional words used, such as "up", "down", "left", "right", "inside" and "outside", are used to facilitate understanding and therefore do not constitute a limitation on the scope of protection of the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A heat dissipation structure for a shielded motor, characterized in that: include: A stator protrusion (1) extends axially along the inner side of the stator core (2) and forms a heat dissipation channel (3) with the stator core (2); A heat dissipation gap (4) is provided between the rotor (5) and a plastic shell (6) encapsulating the stator core (2); The heat dissipation connecting pipe (7) has two ends respectively connected to the heat dissipation channel (3) and the heat dissipation gap (4).

2. The heat dissipation structure for shielded motor according to claim 1, characterized in that: The cross section of the heat dissipation channel (3) is a semicircular structure; The cross section of the heat dissipation connecting pipe (7) is a semicircular structure.

3. The heat dissipation structure for shielded motor according to claim 1, characterized in that: The heat dissipation connecting pipe (7) is fixedly connected to the heat dissipation channel (3) and the heat dissipation gap (4).

4. The heat dissipation structure for shielded motor according to claim 1, characterized in that: The heat dissipation connecting pipe (7) is detachably connected to the heat dissipation channel (3) and the heat dissipation gap (4).

5. The heat dissipation structure for shielded motor according to claim 1, characterized in that: The heat dissipation connecting pipe (7) is in an arc-shaped structure.

6. A shielded motor, comprising the heat dissipation structure according to any one of claims 1 to 5, characterized in that: include: The stator core (2) has a plurality of teeth (8) extending toward the axis on its inner side, and the teeth (8) are wound with windings (9); A plastic shell (6) wrapped around the stator core (2) and the outer side of the winding (9); The rotor (5) is arranged inside the stator core (2) and is coaxially arranged with the axis of the stator core (2); a heat dissipation gap (4) is provided between the rotor (5) and the plastic shell (6).

7. The canned motor according to claim 6, characterized in that: A stator protrusion (1) is provided between adjacent tooth portions (8).

8. The canned motor according to claim 6, characterized in that: The rotor (5) is a circular annular permanent magnet.

9. The canned motor according to claim 8, characterized in that: The rotor (5) has four magnetic poles; the adjacent magnetic poles are opposite magnetic poles and the included angle is 90 degrees.

10. A canned motor pump, characterized in that: Including the shielded motor described in any one of claims 6-9.

Images