Outer rotor motor and pump

Abstract

The utility model provides an external rotor motor and a pump, and belongs to the technical field of water pumps. The problem that an existing pump is short in service life is solved. According to the utility model, the external rotor motor comprises a stator assembly, a rotor assembly and a central shaft, the stator assembly comprises a base and a stator assembly arranged at the front side of the base, and the rotor assembly is cylindrical and is an injection molding integrated piece; the stator assembly is located in an inner cavity of the rotor assembly, the stator assembly and the machine base are formed into a whole through plastic injection molding, and the stator assembly is sealed in plastic. A concave cavity is formed in the front side of the stator assembly, the center shaft is made of corrosion-resistant materials and arranged in the concave cavity, the front end of the rotor assembly is sleeved and fixed to the front end of the center shaft, and the rear end of the center shaft is in running fit with the inner wall of the concave cavity through a first bearing. The pump includes a pump housing and an outer rotor motor disposed within the pump housing. The outer rotor motor and the pump are long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to an outer rotor motor, in particular to an outer rotor motor and a pump. Background Art

[0002] A pump is a machine used to transport or pressurize liquids. It can transfer the mechanical energy of the prime mover or other external energy to the liquid, thereby increasing the energy of the liquid.

[0003] Existing pumps, such as an electric pump disclosed in the Chinese Patent Library (application number: 201410538096.7), include a pump body and a motor, the motor includes a rotating shaft, a motor cavity and a motor unit accommodated in the motor cavity; the motor unit includes an inner stator and an outer rotor, the outer rotor includes a magnetic steel and a bracket, the bracket is a cylinder with a center hole, and the center hole of the cylinder protrudes upward to form a convex ring; the cylinder is sleeved on the inner stator, the magnetic steel is arranged between the inner ring wall of the cylinder and the outer side wall of the inner stator, and the magnetic steel is fixedly connected to the inner ring wall of the cylinder; the convex ring is tightly sleeved on the rotating shaft; the middle part of the front end cover of the motor is raised toward the inner cavity of the motor to form an inner concave part, which is enclosed with the front pump cover of the pump body to form a cavity for obtaining energy when the fluid is sucked from the water inlet of the pump body and accelerated through the impeller In the process of the fluid being thrown out from the water outlet of the pump body, the high-speed circulating fluid fills the inner recess, so that the heat generated by the iron core when the motor is working is transferred to the fluid in the inner recess through heat transfer, and then the motor is taken out of the pump by the circulating fluid to cool the motor; a cooling groove for increasing the contact area between the fluid and the fixed inner stator part of the front end cover is provided on the front end cover of the motor corresponding to the cavity, which is used for the fluid to be sucked from the water inlet of the pump body and accelerated by the impeller to obtain energy and thrown out of the water outlet of the pump body. The high-speed circulating fluid fills the cooling groove through the inner recess, so that the heat generated by the iron core when the motor is working is transferred to the fluid in the cooling groove through heat transfer, and then the motor is taken out of the pump by the circulating fluid; the front end cover is also provided with a drainage chamber located between the front end cover sealing chamber and the front end cover bearing chamber.

[0004] In the above electric pump, the motor is located outside the pump body, and the front cover and the rotating shaft are in contact with the fluid in the pump body for heat dissipation. However, this method cannot significantly speed up the heat dissipation of the motor and affects its lifespan. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes an outer rotor motor and a pump with a long service life.

[0006] One of the purposes of the utility model can be achieved through the following technical solutions: an external rotor motor, including a stator assembly, a rotor component and a central shaft, the stator assembly including a base and a stator component arranged on the front side of the base, characterized in that the rotor component is cylindrical and is an injection-molded integral part; the stator component is in the inner cavity of the rotor assembly, the stator component and the base are formed as a whole by plastic injection molding, and the stator component is sealed in the plastic; a concave cavity is formed on the front side of the stator assembly, the central shaft is made of corrosion-resistant material and is arranged in the concave cavity, the front end of the rotor assembly is sleeved and fixed on the front end of the central shaft, and the rear end of the central shaft is rotatably matched with the inner wall of the concave cavity through a bearing.

[0007] The stator assembly and rotor assembly are both injection-molded one-piece parts, so that the entire outer rotor motor can be completely placed in the pump cavity of the pump and fully contact the fluid, effectively enhancing the heat dissipation effect of the motor and improving the motor life and working stability.

[0008] In the above outer rotor motor, the type of the above bearing 1 is a graphite bearing, the central shaft is hollow and both ends are open, a spiral flow channel 1 is provided on the inner wall of the bearing 1, and a flow guide gap 1 is provided between the central shaft and the bottom wall of the concave cavity so that the inner hole of the central shaft is connected to the spiral flow channel 1. When in use, the fluid enters the spiral flow channel 1 through the inner hole of the central shaft to lubricate the contact between the graphite bearing and the central shaft.

[0009] Graphite bearings have good wear resistance and corrosion resistance. While extending their service life, they can also simplify their structure and facilitate assembly.

[0010] In the above outer rotor motor, the rotor assembly extends backward from the front end surface to form a tube body, which is sleeved on the central shaft and the two are fixedly connected. The tube body is provided to increase the contact area between the rotor assembly and the central shaft, making the connection between the two more reliable.

[0011] In the above-mentioned outer rotor motor, the tube body and the central shaft are detachably connected, which is convenient for processing, assembly and subsequent maintenance.

[0012] In the above-mentioned outer rotor motor, a strip block is fixed on the side wall of the central axis, and the length of the strip block extends axially along the central axis. A slot matching the strip block is axially opened on the inner wall of the tube body, the rear end of the slot is open, and the strip block is clamped in the slot.

[0013] In the above-mentioned outer rotor motor, the strip block is made of elastic material; a circular ring matching the central axis is formed on the rear end face of the tube body, the rear end of the slot extends to the rear end face of the circular ring, and the rear end of the strip block extends to the rear end of the slot, and a pressing sleeve is tightly arranged on the outer sleeve of the circular ring so that the circular ring and the strip block both hold the central axis tightly, so as to further enhance the connection strength and stability of the tube body and the central axis.

[0014] In the above-mentioned outer rotor motor, the two ends of the pressing sleeve are pressed on the bearing 1 and the tube body respectively to prevent the central axis from moving backward and ensure the stable operation of the motor.

[0015] In the above outer rotor motor, an arc groove is provided on the outer wall of the central shaft, and the front and rear ends of the arc groove are both closed, and one side of the front end of the strip block is an arc block matching the arc groove, the arc block is inserted into the arc groove, and the two ends of the arc block are respectively pressed tightly on the front and rear end surfaces of the arc groove. The above design facilitates the connection between the central shaft and the strip block.

[0016] One of the purposes of the utility model can be achieved through the following technical solutions: a pump, comprising a pump casing with a water inlet and a water outlet, the pump casing is provided with the above-mentioned outer rotor motor and an impeller arranged opposite to the water inlet, and the impeller is fixed at the front end of the rotor assembly, the inner wall of the pump casing is formed with a guide vane matching the impeller at the water inlet, the rear end of the guide vane extends into the center hole of the impeller and limits the forward movement of the impeller, characterized in that the machine base is sealed and fixedly connected to the pump casing, a pump cavity is formed between the front side of the machine base and the inner wall of the pump casing, and the water inlet and the water outlet are both connected to the above-mentioned pump cavity. The machine base is used as the skeleton of the outer rotor motor and cooperates with the pump casing to form a pump cavity. In this application, the machine base has a dual-purpose effect, which simplifies the structure and facilitates assembly.

[0017] In the above pump, a guide hole is axially penetrated on the guide vane, the guide hole is arranged opposite to the inner hole of the central shaft, and the front end of the central shaft extends into the guide hole, so that part of the fluid entering from the water inlet can smoothly enter the central shaft, and the graphite bearing is better lubricated.

[0018] In the above-mentioned pump, the guide hole is a stepped hole, which is composed of a large hole and a small hole. The front end of the center shaft is inserted into the large hole, and the front end of the center shaft uses bearing 2 to rotate with the inner wall of the large hole, further enhancing the working stability of the pump.

[0019] In the above pump, the type of bearing 2 is graphite bearing, a spiral flow channel 2 is provided on the inner wall of bearing 2, and a guide gap 2 exists between the central axis and the bottom wall of the large hole to connect the small hole to the spiral flow channel 2.

[0020] Compared with the prior art, the external rotor motor and pump have the following advantages:

[0021] 1. The stator assembly and rotor assembly are both injection-molded one-piece parts, so that the entire outer rotor motor can be completely placed in the pump cavity of the pump and fully contact the fluid, effectively enhancing the heat dissipation effect of the motor. This not only improves the motor life and working stability, but also increases the motor power to increase the torque and make the pump performance stronger.

[0022] 2. The rotor assembly and the center shaft are detachably connected, which is convenient for processing, assembly and subsequent maintenance.

[0023] 3. The machine base is used as the skeleton of the external rotor motor and cooperates with the pump casing to form a pump chamber. In this application, the machine base has a dual-purpose effect, which can omit multiple components of the existing pump. Not only is the structure simple, but the length of the pump can also be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the pump.

[0025] Figure 2 It is a cross-sectional schematic diagram of the pump in the first embodiment.

[0026] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0027] Figure 4 It is a schematic diagram of the connection between the outer rotor motor and the impeller in the first embodiment.

[0028] Figure 5 It is a connection diagram of the pressing sleeve, center shaft and bar block.

[0029] Figure 6 It is a cross-sectional schematic diagram of the pump in the second embodiment.

[0030] In the figure, 1, stator assembly; 1a, machine base; 1b, stator component; 1c, concave cavity; 2, rotor component; 2a, tube body; 2b, slot; 2c, ring; 3, center axis; 4, bearing 1; 4a, spiral flow channel 1; 5, strip block; 5a, arc block; 6, pressing sleeve; 7, pump casing; 7a, water inlet; 7b, water outlet; 7c, guide vane; 7c1, guide hole; 8, impeller; 9, pump chamber; 10, bearing 2. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0032] like Figure 2 As shown, the outer rotor motor includes a stator assembly 1, a rotor assembly 2 and a central shaft 3, wherein the rotor assembly 2 is an existing structure, which is cylindrical and is an injection-molded integral part; the stator assembly 1 includes a base 1a and a stator assembly 1b arranged on the front side of the base 1a, the stator assembly 1b is in the inner cavity of the rotor assembly 2, the stator assembly 1b and the base 1a are formed into a whole by plastic injection molding, and the stator assembly 1b is sealed in the plastic.

[0033] Specifically,

[0034] A cavity 1c is formed on the front side of the stator assembly 1, and the cavity 1c is coaxially arranged with the rotor assembly 2. The central shaft 3 is made of corrosion-resistant material and is arranged in the cavity 1c, and the central shaft 3 and the rotor assembly 2 are coaxially arranged. The front end of the rotor assembly 2 is sleeved and fixed on the front end of the central shaft 3, and the rear end of the central shaft 3 is rotatably matched with the inner wall of the cavity 1c through a bearing 4. Among them, the corrosion-resistant material can be a stainless steel material or a ceramic material, and the central shaft 3 is preferably made of a ceramic material.

[0035] The stator assembly 1 and the rotor assembly 2 are both integrally formed by injection molding, so that the entire outer rotor motor can be completely placed in the pump chamber 9 of the pump and fully contact the fluid, effectively enhancing the heat dissipation effect of the motor and improving the motor life and working stability.

[0036] In this embodiment,

[0037] like Figure 2 and Figure 3 As shown, the type of bearing 14 is a graphite bearing, the central shaft 3 is hollow and both ends are open, a spiral flow channel 14a is provided on the inner wall of the bearing 14, and there is a flow guide gap 1 between the central shaft 3 and the bottom wall of the concave cavity 1c so that the inner hole of the central shaft 3 is connected to the spiral flow channel 14a. When in use, the fluid enters the spiral flow channel 14a through the inner hole of the central shaft 3 to lubricate the contact between the graphite bearing and the central shaft 3. Graphite bearings have good wear resistance and corrosion resistance, and can simplify the structure and facilitate assembly while extending the service life.

[0038] Preferably, the bearing 4 and the stator assembly 1 are integrally formed by injection molding, and a plane extending along the axial direction of the bearing 4 is provided on the outer wall of the bearing 4 to enhance the bonding strength between the bearing 4 and the stator assembly 1.

[0039] The rotor assembly 2 extends backward from the front end face position to form a tube body 2a, and the tube body 2a is sleeved on the central axis 3 and the two are fixedly connected. The tube body 2a is provided to increase the contact area between the rotor assembly 2 and the central axis 3, so that the connection between the two is more reliable. It is further explained that the tube body 2a and the central axis 3 are detachably connected, which is convenient for processing, assembly, and subsequent maintenance. Specifically, a strip block 5 is fixed on the side wall of the central axis 3, and the length of the strip block 5 extends axially along the central axis 3. A slot 2b matching the strip block 5 is axially opened on the inner wall of the tube body 2a, and the rear end of the slot 2b is open, and the strip block 5 is clamped in the slot 2b.

[0040] Further explanation, such as Figure 2 , Figure 3 and Figure 5As shown, the strip block 5 is made of elastic material; a circular ring 2c matching the central axis 3 is formed on the rear end face of the tube body 2a, the rear end of the groove 2b extends to the rear end face of the circular ring 2c, and the rear end of the strip block 5 extends to the rear end of the groove 2b, and a pressing sleeve 6 is tightly wrapped around the outer sleeve of the circular ring 2c so that the circular ring 2c and the strip block 5 both hold the central axis 3 tightly, so as to further enhance the connection strength and stability between the tube body 2a and the central axis 3.

[0041] in,

[0042] The elastic material can be stainless steel or plastic, and preferably the strip block 5 is made of plastic.

[0043] The two ends of the pressing sleeve 6 are pressed on the bearing 1 4 and the tube body 2a respectively to prevent the central axis 3 from moving backward and ensure the stable operation of the motor.

[0044] The bar block 5 and the central axis 3 are connected in the following manner: Figure 2 and Figure 3 As shown, an arc groove is formed on the outer wall of the central shaft 3, and the front and rear ends of the arc groove are both closed, and one side of the front end of the strip block 5 is an arc block 5a matching the arc groove, and the arc block 5a is inserted into the arc groove, and the two ends of the arc block 5a are respectively pressed against the front and rear end surfaces of the arc groove. The above design facilitates the connection between the central shaft 3 and the strip block 5.

[0045] like Figure 1 and Figure 2 As shown, the pump includes a pump housing 7 having a water inlet 7a and a water outlet 7b, the pump housing 7 is provided with the above-mentioned outer rotor motor and an impeller 8 arranged opposite to the water inlet 7a, and the impeller 8 is fixed to the front end of the rotor assembly 2. The inner wall of the pump housing 7 is formed with a guide vane 7c matching the impeller 8 at the water inlet 7a, and the rear end of the guide vane 7c extends into the center hole of the impeller 8 and limits the forward movement of the impeller 8. The machine base 1a is sealed and fixedly connected to the pump housing 7, and a pump cavity 9 is formed between the front side of the machine base 1a and the inner wall of the pump housing 7, and the water inlet 7a and the water outlet 7b are both connected to the above-mentioned pump cavity 9.

[0046] The machine base 1a is used as the skeleton of the external rotor motor and cooperates with the pump housing 7 to form the pump chamber 9. In this application, the machine base 1a has a dual purpose effect, which simplifies the structure and facilitates assembly.

[0047] In this embodiment, the base 1 a is fixedly connected to the pump housing 7 by a circle of screws, and a seal is formed between the side wall of the base 1 a and the inner wall of the pump housing 7 by a sealing ring.

[0048] Further explanation, such as Figure 3 As shown, a guide hole 7c1 is axially penetrated on the guide vane 7c, and the guide hole 7c1 is arranged opposite to the inner hole of the central shaft 3, and the front end of the central shaft 3 extends into the guide hole 7c1, so that part of the fluid entering from the water inlet 7a can smoothly enter the central shaft 3, and the graphite bearing is better lubricated.

[0049] The flow guide hole 7c1 is preferably a stepped hole, and the flow guide hole 7c1 is composed of a large hole and a small hole. The front end of the central shaft 3 is inserted into the large hole, and the front end of the central shaft 3 is rotated with the inner wall of the large hole by the bearing 2 10, so as to further enhance the working stability of the pump. In this embodiment, the bearing 2 10 is a graphite bearing, and a spiral flow channel 2 is provided on the inner wall of the bearing 2 10, and a flow guide gap 2 is provided between the central shaft 3 and the bottom wall of the large hole to connect the small hole to the spiral flow channel 2. Embodiment 2

[0050] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the rotor assembly 2 and the central shaft 3 are formed into a whole by injection molding.

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An external rotor motor, comprising a stator assembly (1), a rotor assembly (2) and a central shaft (3), wherein the stator assembly (1) comprises a base (1a) and a stator assembly (1b) arranged on the front side of the base (1a), characterized in that: The rotor assembly (2) is cylindrical and is an integral injection-molded component; the stator assembly (1b) is located in the inner cavity of the rotor assembly (2); the stator assembly (1b) and the base (1a) are formed into a whole by plastic injection molding, and the stator assembly (1b) is sealed in the plastic; a concave cavity (1c) is formed on the front side of the stator assembly (1); the center shaft (3) is made of corrosion-resistant material and is arranged in the concave cavity (1c); the front end of the rotor assembly (2) is sleeved and fixed on the front end of the center shaft (3), and the rear end of the center shaft (3) is rotatably matched with the inner wall of the concave cavity (1c) through a bearing 1 (4).

2. The outer rotor motor according to claim 1, characterized in that: The bearing 1 (4) is a graphite bearing, the central shaft (3) is hollow and open at both ends, a spiral flow channel 1 (4a) is provided on the inner wall of the bearing 1 (4), and a flow guide gap 1 is provided between the central shaft (3) and the bottom wall of the concave cavity (1c) so that the inner hole of the central shaft (3) is connected to the spiral flow channel 1 (4a).

3. The outer rotor motor according to claim 1 or 2, characterized in that: The rotor assembly (2) extends backward from the front end surface to form a tube body (2a), and the tube body (2a) is sleeved on the central shaft (3) and the two are fixedly connected.

4. The outer rotor motor according to claim 3, characterized in that: The tube body (2a) and the central shaft (3) are detachably fixedly connected.

5. The outer rotor motor according to claim 4, characterized in that: A strip block (5) is fixed on the side wall of the central axis (3), and the length of the strip block (5) extends axially along the central axis (3). A slot (2b) matching the strip block (5) is axially opened on the inner wall of the tube body (2a), and the slot (2b) is open at the rear end, and the strip block (5) is clamped in the slot (2b).

6. The outer rotor motor according to claim 5, characterized in that: The strip block (5) is made of elastic material; a circular ring (2c) matching the central axis (3) is formed on the rear end surface of the tube body (2a); the rear end of the groove (2b) extends to the rear end surface of the circular ring (2c), and the rear end of the strip block (5) extends to the rear end of the groove (2b); a pressing sleeve (6) is tightly wrapped around the outer shell of the circular ring (2c) so that the circular ring (2c) and the strip block (5) both hold the central axis (3) tightly.

7. The outer rotor motor according to claim 5, characterized in that: The two ends of the pressing sleeve (6) are pressed onto the bearing 1 (4) and the tube body (2a) respectively.

8. A pump, comprising a pump casing (7) having a water inlet (7a) and a water outlet (7b), wherein the pump casing (7) is provided with an outer rotor motor as claimed in any one of claims 1 to 7 and an impeller (8) arranged opposite to the water inlet (7a), and the impeller (8) is fixed to the front end of the rotor assembly (2), and a guide vane (7c) matching the impeller (8) is formed on the inner wall of the pump casing (7) at the water inlet (7a), and the rear end of the guide vane (7c) extends into the central hole of the impeller (8) and limits the forward movement of the impeller (8), characterized in that: The machine base (1a) is sealed and fixedly connected to the pump casing (7); a pump chamber (9) is formed between the front side of the machine base (1a) and the inner wall of the pump casing (7); and the water inlet (7a) and the water outlet (7b) are both connected to the pump chamber (9).

9. The pump according to claim 8, characterized in that A guide hole (7c1) is axially penetrated on the guide vane (7c), the guide hole (7c1) is arranged opposite to the inner hole of the central shaft (3), and the front end of the central shaft (3) extends into the guide hole (7c1).

10. The pump according to claim 9, characterized in that The guide hole (7c1) is a stepped hole. The guide hole (7c1) is composed of a large hole and a small hole. The front end of the central shaft (3) is inserted into the large hole, and the front end of the central shaft (3) is rotatably matched with the inner wall of the large hole by means of a second bearing (10).

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