Direct-drive permanent magnet motor with internal air-cooled plunger pump and vibration-reducing stabilization structure

Abstract

The present invention relates to the technical field of direct-drive permanent magnet motors, and discloses an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure. The motor adopts an air-cooled heat dissipation method, forms an annular wind bin according to the setting position of the stator, utilizes high-speed airflow to drive the continuous flow of cold air, thereby taking away the high heat inside the body and achieving the purpose of heat dissipation, and further adds central fins and U-shaped fins for the flow process of high-speed flow. The essence of the two fins is to change the flow mode of the high-speed airflow to achieve the purpose of reducing the kinetic energy of the high-speed airflow and avoid excessive additional noise generated by friction between the airflow and the air. For this purpose, the structural characteristics of the two and the movement mode of the central fin are preferentially restricted, and an air-blocking component is further added. The essence of the air-blocking component is to cooperate with the rotor rotation process to limit the secondary flow process of the airflow, on the one hand, to further reduce the airflow pressure environment inside the body, and on the other hand, to maintain the dynamic stability of the rotor during movement.

Description

Technical Field

[0001] The present invention relates to the technical field of direct-drive permanent magnet motors, and in particular to an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure. Background Art

[0002] For the driving motor used in the plunger pump, since its temperature change is one of the key factors affecting the operating efficiency, a heat dissipation structure is usually added. For details, please refer to the relevant content in publication numbers CN103580422A and CN103580421A. Specific heat dissipation methods include air cooling and liquid cooling.

[0003] However, considering the air cooling method used in the permanent magnet motors used in oil field plunger pumps, the permanent magnet motors themselves have relatively loud operating noise. The essence of the air cooling method is to use high-speed airflow to remove heat from the body, but the friction between the airflow and the air aggravates the noise generation. In addition, the high-speed airflow will also drive the air pressure environment inside the body, which may cause a greater workload on the key transmission structure and further affect the stability of the transmission process.

[0004] This application proposes a solution to this problem. Summary of the Invention

[0005] The purpose of the present invention is to provide an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure. Regarding the heat dissipation process in the permanent magnet motor used in the plunger pump, air cooling is mainly used because the permanent magnet motor has relatively large operating noise, and the friction between the high-speed airflow and the air during air cooling aggravates the noise generation. In addition, the high-speed airflow will also indirectly affect the operating stability of the key structures inside the body.

[0006] The object of the present invention can be achieved by the following technical solution: an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure includes a body and a rotor and a stator arranged inside the body, an air duct component is provided between the stator and the inner wall of the body, and an air blocking component is provided at one end of the body corresponding to the rotor;

[0007] An air duct for connecting to an air pump assembly is installed on the outer wall of the body. The body forms an annular air bin through the air duct assembly. The air duct assembly includes an air hood tube, a dynamic ring sheet, a central fin and a U-shaped fin. The air hood tube is provided with air leakage ports at both ends corresponding to the length direction of the rotor.

[0008] It is further configured as follows: the dynamic ring piece is located in the middle section of the wind hood pipe, and the setting position of the dynamic ring piece corresponds to the wind pipe.

[0009] It is further configured as follows: the inner wall of the wind hood tube contacts the outer wall of the stator, and a mounting half ring is provided between the stator and the inner wall of the machine body.

[0010] It is further configured as follows: the central fin is installed on the dynamic ring plate, the U-shaped fin is installed on the wind hood tube, and the central fin and the U-shaped fin are arranged in a circular array along the center point of the wind hood tube.

[0011] It is further configured that: the dynamic ring piece and the wind hood pipe are rotationally connected.

[0012] It is further configured that: the central fin is inclined in the direction pointing to the U-shaped fin, and the inclination direction of the central fin matches the rotation direction of the dynamic ring plate.

[0013] It is further configured as follows: the U-shaped fins in each adjacent position are staggered along their opening direction, and a U-shaped three-bend air duct is formed between the U-shaped fins in each adjacent position, and the air leakage port is located at a bend in the U-shaped three-bend air duct.

[0014] It is further configured as follows: the air-blocking assembly includes a fixed ring, a mounting block and a plurality of cooperating fins, the fixed ring is rotatably mounted in the inner wall position of the machine body, the mounting block is mounted on the rotating shaft position of the rotor, and a directional connecting rod is installed between the outer wall of the mounting block and the inner wall of the fixed ring, and the cooperating fin and the directional connecting rod are rotatably connected.

[0015] It is further configured as follows: the directional connecting rods are arranged in a ring array along the center point of the mounting block, and a connecting spring is installed at one end of the directional connecting rod corresponding to the fixing ring.

[0016] The present invention has the following beneficial effects:

[0017] The air cooling method of permanent magnet motors in oilfield mining operations is optimized and improved. First, an annular wind silo is formed between the position of the stator and the inner wall of the machine body through the wind hood tube. The cold air continuously pumped in by the air pump assembly is injected into the interior of the machine body, and the heat inside the machine body is taken away by the heat exchange principle. The difference is that central fins and U-shaped fins are added to the inside of the annular wind silo, mainly to exchange heat between the high-speed flowing cold air and the interior of the machine body. For this, it is also necessary to add and optimize the structural characteristics of the central fins and U-shaped fins. First, the central fins and dynamic ring pieces are dynamically rotated by the high-speed airflow, thereby initially reducing the kinetic energy of the high-speed airflow. Secondly, the structural characteristics of the U-shaped fins are optimized, the purpose of which is to "absorb" the kinetic energy in the high-speed airflow and avoid excessive noise caused by friction between the high-speed airflow and the air.

[0018] Based on the above content, when limiting the structural characteristics of the center fin and the U-shaped fin and the movement mode of the center fin, it is also necessary to add an air leakage port according to the U-shaped three-bend air duct to ensure that the cold air flow after "deceleration" enters the body for sufficient heat exchange. For this purpose, an air blocking component is further added. The air blocking component mainly cooperates with the rotation of the rotor and the flow mode of the cold air flow. On the one hand, it further reduces the air flow pressure environment inside the body, and on the other hand, it maintains the dynamic stability of the rotor during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of the direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure proposed in the present invention;

[0021] Figure 2 This is a cross-sectional view of the body of the direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure proposed by the present invention;

[0022] Figure 3 The invention proposes an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure. Figure 1 Corresponding longitudinal cross-sectional view of the air duct;

[0023] Figure 4 The invention proposes an internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure. Figure 2 Split diagram of ;

[0024] Figure 5 This is a disassembled diagram of the airway assembly in the direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure proposed by the present invention;

[0025] Figure 6 This is an axial front view of the air duct corresponding to the air duct assembly in the direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure proposed by the present invention;

[0026] Figure 7 This is a disassembled diagram of the air-blocking component in the direct-driven permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure proposed in the present invention.

[0027] In the figure: 1. Body; 101. Annular air silo; 2. Air duct; 3. Fixed ring; 4. Air hood tube; 401. Center fin; 402. U-shaped fin; 403. Air leakage port; 404. Dynamic ring piece; 5. Mounting half ring; 6. Mounting block; 7. Directional connecting rod; 8. Connecting spring; 9. Cooperative fin. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1: Regarding the heat dissipation process in the permanent magnet motor used in the plunger pump, air cooling is mainly used. Because the permanent magnet motor is relatively noisy during operation, and the friction between the high-speed airflow and the air during air cooling exacerbates the noise level, and the high-speed airflow also indirectly affects the operating stability of the key structures inside the body, the following technical solution is proposed:

[0030] Reference Figures 1 to 7 The internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure in this embodiment includes a body 1 and a rotor and a stator disposed inside the body 1. An air duct component is disposed between the stator and the inner wall of the body 1, and an air blocking component is disposed at one end of the body 1 corresponding to the rotor.

[0031] An air duct 2 for connecting the air pump assembly is installed on the outer wall of the body 1. The body 1 forms an annular air bin 101 through the air duct assembly. The air duct assembly includes an air hood tube 4, a dynamic ring sheet 404, a central fin 401 and a U-shaped fin 402. The air hood tube 4 is provided with air leakage ports 403 at both ends corresponding to the length direction of the rotor.

[0032] Basic principle: The direct drive permanent magnet motor used in the plunger pump used in oil field exploitation is explained. Because of its continuous motion, it is necessary to optimize the heat dissipation inside it. The conventional air cooling heat dissipation method is the most direct and effective. The present invention is also based on air cooling heat dissipation. Its essence is to continuously pump cold air into the body 1 through the air duct 2 by the air pump component, and to perform a continuous heat exchange process between the cold air flow and the high temperature environment inside the body 1, and to combine it with Figure 4 Provide explanation;

[0033] The cold air flow pumped by the air pump assembly is mainly located in the wind hood tube 4, and the wind hood tube 4 is installed at the external position of the stator. Because the key heat source of the integral permanent magnet motor is the stator structure, it is also necessary to briefly explain that the material of the wind hood tube 4 is limited to a high thermal conductivity material, so that rapid heat exchange can be achieved between the cold air flow and the stator;

[0034] Finally, the airflow after heat exchange will leak out from the annular wind bin 101 through the air leakage port 403, and because an air grid is provided at one end of the overall body 1, the airflow after heat exchange is discharged from the air grid. It should also be noted that: there is a significant difference between the present invention and the conventional air cooling and heat dissipation method in that the high-temperature gas inside the body 1 is not blown out by high-speed airflow, but the purpose of cooling the body 1 after sufficient heat exchange is achieved. This purpose is to avoid sufficient friction between the high-speed gas and the air during flow and generate large friction noise.

[0035] Example 2: Based on the technical solution in Example 1, the overall airway assembly is described:

[0036] The dynamic ring piece 404 is located in the middle section of the wind hood tube 4, and the setting position of the dynamic ring piece 404 corresponds to the wind duct 2. The inner wall of the wind hood tube 4 is in contact with the outer wall of the stator. A mounting half ring 5 is provided between the stator and the inner wall of the body 1. The central fin 401 is mounted on the dynamic ring piece 404, and the U-shaped fin 402 is mounted on the wind hood tube 4. The central fin 401 and the U-shaped fin 402 are arranged in a circular array along the center point of the wind hood tube 4.

[0037] The dynamic ring piece 404 is rotationally connected to the wind hood tube 4, the central fin 401 is inclined in the direction pointing to the U-shaped fin 402, and the inclination direction of the central fin 401 matches the rotation direction of the dynamic ring piece 404. The U-shaped fins 402 in each adjacent position are staggered along their opening direction, and a U-shaped three-bend air duct is formed between the U-shaped fins 402 in each adjacent position, and the air leakage port 403 is located at a bend in the U-shaped three-bend air duct.

[0038] Solution Description: Combined with Figure 5 and Figure 6 To illustrate, the key content of the present invention is the structure of the wind shield tube 4, and refer to Figure 3 The hood tube 4 is located between the inner wall of the body 1 and the outer wall of the stator, and the stator is mainly rotatably mounted on the inner wall of the body 1 by means of the mounting half ring 5, while the hood tube 4 is directly fixed to the inner wall of the body 1, so that the cold air flow pumped into the air duct 2 mainly remains inside the annular air silo 101 formed by the hood tube 4. However, the specific flow process of the cold air flow is optimized and improved as follows:

[0039] S1: Because the cold air flow pumped out by the air pump assembly has high kinetic energy, if only the air hood tube 4 is provided inside the body 1, then due to the kinetic energy of the high-speed cold air flow, friction occurs with the annular air silo 101 and the air environment inside the body 1, thereby generating a large friction noise. In response to this, the central fin 401 and the U-shaped fin 402 are obtained after the air hood tube 4 is improved. The key purpose of the central fin 401 and the U-shaped fin 402 is to change the flow pattern of the cold air flow and "consume" the air flow kinetic energy, thereby reducing the noise generated by friction.

[0040] S2: In combination with S1, there is a difference in the installation method of the central fin 401 and the U-shaped fin 402. First, the U-shaped fin 402 is located at both ends of the central fin 401, and the U-shaped fin 402 is directly installed inside the wind shield tube 4, but the central fin 401 is installed in the dynamic ring piece 404, and ensure that the dynamic ring piece 404 can rotate freely in the wind shield tube 4;

[0041] S3: The technical content in S2 is combined again for explanation: the setting position of the dynamic ring piece 404 corresponds to the setting position of the air duct 2, and is combined with Figure 6 To illustrate, when the cold air flow is pumped from the air duct 2 into the annular air chamber 101, the structural characteristics of the central fin 401 are first limited to Figure 6 Based on the V-shaped structure shown in FIG, when the cold airflow acts on the multiple center fins 401, the dynamic ring pieces 404 are driven to rotate in a directional manner based on the kinetic energy of the cold airflow itself. Therefore, it can be understood that the cold airflow only flows in an annular manner in the area of the dynamic ring pieces 404. However, during the rotation of the dynamic ring pieces 404, the cold airflow is affected by the interference of the center fins 401, and the cold airflow in the annular flow process is "driven" into the U-shaped fins 402, as shown in FIG. Figure 6 As shown, each U-shaped fin 402 has two U-shaped structures, and they are staggered in adjacent positions. Therefore, each U-shaped fin 402 is combined to form an independent U-shaped three-bend air duct. The cold air flow will flow in a U-shaped manner in the U-shaped three-bend air duct. The purpose of this is to extend the heat exchange time between the cold air flow and the stator. The air flow after heat exchange is leaked into the interior of the body 1 through the leakage port 403.

[0042] For this purpose, it is necessary to limit the end of the U-shaped fin 402 away from the central fin 401 to be connected to the wind cover tube 4, so as to ensure that the U-shaped three-bend air duct is only connected to the central fin 401 through the air leakage port 403, and the U-shaped three-bend air duct.

[0043] Example 3: In combination with the technical content of Example 2, a structural description of the gas blocking component is provided:

[0044] The air-blocking assembly includes a fixed ring 3, a mounting block 6 and a plurality of cooperating fins 9. The fixed ring 3 is rotatably mounted on the inner wall of the body 1, the mounting block 6 is mounted on the rotating shaft of the rotor, and a directional link 7 is installed between the outer wall of the mounting block 6 and the inner wall of the fixed ring 3. The cooperating fin 9 and the directional link 7 are rotatably connected. The directional link 7 is arranged in a circular array along the center point of the mounting block 6, and a connecting spring 8 is installed at one end of the directional link 7 corresponding to the fixed ring 3.

[0045] Solution Description: Combined with Figure 4 To illustrate, in a conventional motor structure, an air grid is provided at one end, and the kinetic energy of the gas leaking from the annular air bin 101 is relatively low. For this, an air blocking component is added to the inner position of the other end of the body 1. The essence of the air blocking component is not to hinder the flow process of the air flow, but to interfere with the flow direction of the air flow in conjunction with the rotation process of the rotor. For details, refer to Figure 7 To explain:

[0046] First, the mounting block 6 is directly fixed on the rotor shaft, thereby cooperating with the directional connecting rod 7 and the fixing ring 3 to perform directional rotation, and its rotation process is completely matched with the rotation state of the rotor. Considering the relatively stable airflow inside the body 1, each cooperating wing 9 is first driven to deviate in the direction pointing to the fixing ring 3 under the action of centrifugal force, and its deviation stroke is proportional to the centrifugal force. For this purpose, a connecting spring 8 is added to one end of the directional connecting rod 7, and the overall fixing ring 3 and the mounting block 6 cooperate with the directional connecting rod 7 to maintain stability during the rotation process of the rotor. The main purpose of the connecting spring 8 is to reduce the stroke speed of the cooperating wing 9 and achieve the purpose of buffering and absorbing energy.

[0047] However, in actual circumstances, the airflow in the annular wind bin 101 will continue to flow into the interior of the body 1, and the cooperative fins 9 will also undergo directional deflection when cooperating with the rotor rotation, thereby interfering with the airflow direction inside the body 1. Because in the initial state, the position of the cooperative fins 9 will not tilt, and when the rotor is in continuous rotation, the cooperative fins 9 will undergo directional rotation, so it can be understood that: in actual circumstances, the airflow leaking from the annular wind bin 101 will interfere with the rotation direction of the cooperative fins 9. To summarize, the rotation process of the cooperative fins 9 will interfere with the airflow direction inside the body 1, and conversely, the airflow leaking from the wind hood tube 4 will also interfere with the rotation action of the cooperative fins 9. The cooperative fins 9 serve as a "counterweight" in the rotation process of the rotor, and their rotation action will also serve the purpose of initially maintaining stability in the rotor rotation process.

[0048] In summary: using air cooling to dissipate heat, an annular wind bin is formed for the setting position of the stator, and high-speed airflow is used to drive the continuous flow of cold air to take away the high heat inside the body to achieve the purpose of heat dissipation, and further center fins and U-shaped fins are added for the flow process of high-speed flow. The essence of the two is to change the flow mode of high-speed airflow to reduce the kinetic energy of high-speed airflow and avoid excessive additional noise caused by friction between airflow and air. For this purpose, the structural characteristics of the two and the movement mode of the center fin are restricted first, and an air-blocking component is further added. The essence of the air-blocking component is to cooperate with the rotor rotation process to limit the secondary flow process of the airflow. On the one hand, it further reduces the airflow pressure environment inside the body, and on the other hand, it maintains the dynamic stability of the rotor during movement.

[0049] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An internal air-cooled plunger pump direct-drive permanent magnet motor with a vibration reduction and stabilization structure, comprising a body (1) and a rotor and a stator arranged inside the body (1), characterized in that: An air passage assembly is provided between the stator and the inner wall of the body (1), and an air blocking assembly is provided at one end of the body (1) corresponding to the rotor; An air duct (2) for connecting to an air pump assembly is installed on the outer wall of the machine body (1). The machine body (1) forms an annular air bin (101) through the air duct assembly. The air duct assembly includes an air hood pipe (4), a dynamic ring piece (404), a central fin (401) and a U-shaped fin (402). The air hood pipe (4) is provided with air leakage ports (403) at both ends corresponding to the length direction of the rotor. The dynamic ring piece (404) is arranged at a position corresponding to the air duct (2), the inner wall of the air hood tube (4) is in contact with the outer wall of the stator, the central fin (401) is installed on the dynamic ring piece (404), the dynamic ring piece (404) and the air hood tube (4) are rotatably connected, the central fin (401) is inclined in a direction pointing to the U-shaped fin (402), and the inclination direction of the central fin (401) matches the rotation direction of the dynamic ring piece (404).

2. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 1 is characterized in that: The dynamic ring piece (404) is located in the middle section of the wind hood tube (4).

3. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 1 is characterized in that: A mounting half ring (5) is provided between the stator and the inner wall of the machine body (1).

4. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 1 is characterized in that: The U-shaped fins (402) are mounted on the wind hood tube (4), and the central fins (401) and the U-shaped fins (402) are arranged in a circular array along the center point of the wind hood tube (4).

5. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 1, characterized in that: The U-shaped fins (402) in each adjacent position are staggered along their opening direction, and a U-shaped three-bend air duct is formed between the U-shaped fins (402) in each adjacent position, and the air leakage port (403) is located at a bend in the U-shaped three-bend air duct.

6. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 1, characterized in that: The air blocking assembly comprises a fixed ring (3), a mounting block (6) and a plurality of cooperating fins (9); the fixed ring (3) is rotatably mounted on the inner wall of the body (1); the mounting block (6) is mounted on the rotating shaft of the rotor; a directional connecting rod (7) is mounted between the outer wall of the mounting block (6) and the inner wall of the fixed ring (3); and the cooperating fins (9) and the directional connecting rod (7) are rotatably connected.

7. The direct-drive permanent magnet motor with an internal air-cooled plunger pump and a vibration-reducing and stabilizing structure according to claim 6, characterized in that: The directional connecting rods (7) are arranged in a ring array along the center point of the mounting block (6), and a connecting spring (8) is installed at one end of the directional connecting rod (7) corresponding to the fixing ring (3).

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