Motor structure and automatic inflation and exhaust vacuum pump

Abstract

The utility model discloses a motor structure and automatic inflation and deflation vacuum pump, including motor housing, rotor, stator, motor shaft and motor base, motor housing and motor base define a motor cavity, stator is arranged in motor cavity and fixed on the inner side wall of motor housing, motor shaft longitudinally passes through motor cavity, and motor shaft is fixed on the motor base. The upper end of the motor shaft extends out of the top of the motor shell, the lower end of the motor shaft extends to the motor base, the rotor is arranged in the motor cavity and fixed to the motor shaft, the motor shaft is provided with an axial hole in the axial direction, the upper end of the axial hole extends to the top of the motor shaft, and the motor shaft is provided with a radial hole in the radial direction. The inner end of the radial hole is communicated with the axial hole through an air path, an air inlet gap communicated with an external air path is arranged between the motor shell and the motor base, and the outer end of the radial hole is communicated with the air inlet gap through the motor cavity through an air path. When the vacuum pump is applied to the vacuum pump, the pump body does not need to be improved, and the design complexity of the pump body is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and more specifically to a motor structure and an automatic filling and emptying vacuum pump. Background Technology

[0002] Vacuum pumps are widely used in medical equipment, instruments, consumer electronics, and optical equipment. A vacuum pump mainly consists of a motor and a pump body. For vacuum pumps that only need to perform exhaust functions, an air outlet is typically located on the pump body. However, for vacuum pumps that require both exhaust and inflation functions, an air delivery structure is needed to introduce outside air into the pump body. This structure then delivers the air to the product requiring inflation. Therefore, the design of the air delivery structure is crucial to the overall layout of the vacuum pump. Currently, the air delivery structure is generally located on the pump body. Since the pump body itself is already quite complex, placing the air delivery structure there would require additional air passages, further complicating the pump body design and hindering manufacturing. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a motor structure and an automatic filling and emptying vacuum pump.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On one hand, this utility model provides a motor structure, including a motor housing, a rotor, a stator, a motor shaft, and a motor base. The motor base is connected to the bottom of the motor housing, and the motor housing and the motor base define a motor cavity. The stator is disposed in the motor cavity and fixed to the inner wall of the motor housing. The motor shaft extends longitudinally through the motor cavity, with its upper end extending beyond the top of the motor housing and its lower end extending to the motor base. The rotor is disposed in the motor cavity and fixed to the motor shaft. The motor shaft has an axial hole along its axial direction, with its upper end extending to the top of the motor shaft. The motor shaft also has a radial hole along its radial direction, with the inner end of the radial hole communicating with the air passage of the axial hole. An air intake gap communicating with the outside air passage is provided between the motor housing and the motor base, and the outer end of the radial hole communicates with the air intake gap through the motor cavity.

[0006] A further technical solution is that the radial hole is located inside the motor cavity.

[0007] A further technical solution is that the radial hole is located above or below the rotor mounting position.

[0008] A further technical solution is that the axial hole is arranged at the center of the motor shaft.

[0009] The further technical solution is as follows: the motor base is provided with a base limiting hole corresponding to the position of the motor shaft, and the lower end of the motor shaft extends into the base limiting hole.

[0010] A further technical solution is as follows: the bottom of the motor housing is open, and the motor base is embedded in the opening of the motor housing.

[0011] A further technical solution is that the air intake gap is arranged around the periphery of the motor base.

[0012] A further technical solution is that the inner diameter of the axial hole is one-third to one-fifth of the diameter of the motor shaft.

[0013] A further technical solution is as follows: a circular boss extends upward from the top center of the motor housing.

[0014] On the other hand, this utility model also provides an automatic filling and emptying vacuum pump, including a pump body and the above-mentioned motor structure.

[0015] The advantages of this utility model compared with the prior art are as follows: A motor structure includes a motor housing, a rotor, a stator, a motor shaft, and a motor base. The motor base is connected to the bottom of the motor housing, and the motor housing and the motor base define a motor cavity. The stator is disposed in the motor cavity and fixed to the inner side wall of the motor housing. The motor shaft extends longitudinally through the motor cavity, with its upper end extending beyond the top of the motor housing and its lower end extending to the motor base. The rotor is disposed in the motor cavity and fixed to the motor shaft. The motor shaft has an axial hole along its axial direction, with its upper end extending to the top of the motor shaft. The motor shaft also has a radial hole along its radial direction, with the inner end of the radial hole communicating with the air passage of the axial hole. An air intake gap communicating with the outside air passage is provided between the motor housing and the motor base, and the outer end of the radial hole communicating with the air intake gap air passage through the motor cavity. By utilizing the axial and radial holes in the motor shaft, and combining them with the air intake gap formed by the motor housing and base, when applied to a vacuum pump, outside air can be introduced into the pump body through the axial and radial holes and the air intake gap, thus achieving the inflation function. This eliminates the need for modifications to the pump body, reducing its design complexity. Furthermore, the design leverages the existing structure of the motor itself, requiring minimal alterations and making the function easy to implement.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a motor structure is provided for a specific embodiment of this utility model;

[0019] Figure 2 An exploded view of a motor structure provided for a specific embodiment of this utility model;

[0020] Figure 3 An assembly drawing of an automatic filling and emptying vacuum pump provided for a specific embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of an automatic filling and emptying vacuum pump provided for a specific embodiment of the present utility model.

[0022] Figure Labels

[0023] 1. Motor housing; 11. Circular boss; 2. Motor shaft; 21. Axial hole; 22. Radial hole; 3. Rotor; 4. Motor base; 41. Base limiting hole; 5. Pump body; 51. Bottom cover; 511. Inlet / outlet port; 52. Cylinder body; 53. Leather cup; 54. Valve plate; 55. Top cover; 56. Valve body; 561. Air guide hole; 562. Air inlet hole; 563. Sealing block; 57. Swing frame; 58. Eccentric shaft; 59. Pump chamber. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be understood that, when used in this specification and claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] like Figures 1-4 As shown, this utility model embodiment provides a motor structure for use in a vacuum pump. The motor structure includes a motor housing 1, a rotor 3, a stator (not shown in the figure), a motor shaft 2, and a motor base 4. The motor base 4 is connected to the bottom of the motor housing 1, and the motor housing 1 and motor base 4 define a motor cavity. The stator is disposed in the motor cavity and fixed to the inner wall of the motor housing 1. The motor shaft 2 extends longitudinally through the motor cavity, with its upper end extending beyond the top of the motor housing 1 and its lower end extending to the motor base 4. The rotor 3 is disposed in the motor cavity and fixed to the motor shaft 2. The motor shaft 2 has an axial hole 21 along its axial direction, with its upper end extending to the top of the motor shaft 2. The motor shaft 2 also has a radial hole 22 along its radial direction, with the inner end of the radial hole 22 communicating with the air passage of the axial hole 21. An air inlet gap communicating with the outside air passage is provided between the motor housing 1 and the motor base 4, and the outer end of the radial hole 22 communicates with the air inlet gap through the motor cavity.

[0029] By utilizing the motor shaft 2 of the motor itself to open the axial hole 21 and the radial hole 22, and in conjunction with the air intake gap formed by the motor housing 1 and the motor base 4, when applied in a vacuum pump, the axial hole 21, the radial hole 22 and the air intake gap can be used to allow outside air to enter the pump body 5, thereby realizing the air filling function. No modifications to the pump body 5 are required, reducing the design complexity of the pump body 5. In addition, the original structure of the motor itself is used in the design, and no major modifications to the motor are required, making the function easy to implement.

[0030] like Figure 4As shown, the radial hole 22 is located inside the motor cavity; more specifically, the radial hole 22 is located above or below the mounting position of the rotor 3. The purpose of this design is to ensure that the normal movement of the rotor 3 does not interfere with the radial hole 22, and to allow the gas entering from the intake gap to be guided into the axial hole 21 via the motor cavity.

[0031] In this embodiment, two radial holes 22 are provided, symmetrically arranged relative to the motor shaft 2. The two radial holes 22 and one axial hole 21 are interconnected. That is, the external gas entering from the intake gap enters the motor cavity through the two radial holes 22 and then converges at the lower end of the axial hole 21, and then is sent to the pump body 5 from the upper end of the axial hole 21. Of course, in other embodiments, the number of radial holes 22 can be other, such as three or four, etc.

[0032] Preferably, the axial hole 21 is located at the center of the motor shaft 2. This facilitates machining and connection with other components.

[0033] The motor base 4 has a base limiting hole 41 corresponding to the position of the motor shaft 2, and the lower end of the motor shaft 2 extends into the base limiting hole 41. The base limiting hole 41 serves to limit and support the lower end of the motor shaft 2. Preferably, the base limiting hole 41 is a round hole.

[0034] The bottom of the motor housing 1 is open, and the motor base 4 is embedded in the opening of the motor housing 1. By using the embedded method, the length of the motor is reduced without affecting the motor performance, making the motor structure more compact.

[0035] Preferably, the air intake gap is arranged around the periphery of the motor base 4. This design not only increases the air intake volume, but also enables concealed air intake.

[0036] Preferably, the inner diameter of the axial hole 21 is one-third to one-fifth of the diameter of the motor shaft 2. The purpose of this design is to avoid the axial hole 21 occupying too much or too little space on the motor shaft 2. If it occupies too much space, that is, the hole diameter is too large, the strength of the part of the motor shaft 2 with the axial hole 21 will be low. If it occupies too little space, that is, the hole diameter is too small, the amount of gas flowing per unit time will be small.

[0037] Optionally, a circular boss 11 extends upward from the top center of the motor housing 1. This design facilitates the connection between the motor housing 1 and other components, and also facilitates the installation of a sealing ring on the circular boss 11 to improve the sealing performance at the connection between the motor housing 1 and other components.

[0038] like Figures 1-4As shown, this utility model embodiment also provides an automatic filling and emptying vacuum pump, including a pump body 5 and the aforementioned motor structure. The pump body 5 includes an upper cover 55, a bottom cover 51, and an air pump assembly. The upper cover 55 has an air outlet, and the bottom cover 51 has a filling and emptying port 511. The air pump assembly is located between the upper cover 55 and the bottom cover 51. The motor housing 1 is sealed and connected to the bottom cover 51 below. The motor shaft 2 extends towards the bottom cover 51. The air pump assembly and the bottom cover 51 define a pump chamber 59. A rotatable valve body 56 is provided in the pump chamber 59. The valve body 56 is eccentrically connected to the air pump assembly. The upper end of the motor shaft 2 extends into the pump chamber 59 and is connected to the valve body 56. 56 is provided with a valve chamber, which has an air guide hole 561 that communicates with the air passage of the pump chamber 59, and an air inlet hole 562 for introducing external gas. After the upper end of the motor shaft 2 is connected to the valve body 56, the axial hole 21 of the motor shaft 2 and the air inlet hole 562 form an air passage. A sealing block 563, a valve plate 54, a swivel cup 53, a cylinder body 52, and a swing frame 57 are movably arranged in the valve chamber. The valve plate 54 is located below the upper cover 55 and has a pin on it. The valve plate 54 is pressed against the top of the swivel cup 53. The swivel cup 53 is installed on the cylinder body 52. ​​The bottom of the swivel cup 53 is connected to the swing frame 57. The swing frame 57 is eccentrically connected to the valve body 56 through an eccentric shaft 58.

[0039] When the motor is working, the motor shaft 2 drives the valve body 56 to rotate. The sealing block 563 of the valve body 56 is subjected to centrifugal force, which blocks the air guide hole 561. At this time, the external airflow cannot be introduced into the pump chamber 59 through the axial hole 21. However, the air pump assembly can work normally, so that the air outlet, pump chamber 59 and charging / discharging port 511 form an air passage to realize the exhaust function. When the motor stops working, the air pump assembly does not work. The air outlet, pump chamber 59 and charging / discharging port 511 form an air passage under the action of the air pump assembly. However, since the sealing block 563 is not subjected to centrifugal force, the air guide hole 561 is not blocked. At this time, the external airflow can enter the pump chamber 59 sequentially from the air inlet gap, radial hole 22, axial hole 21 through the air inlet hole 562, so that the axial hole 21, air inlet hole 562, pump chamber 59 and charging / discharging port 511 form an air passage to realize the inflation function. It can be seen that the design of the axial hole 21 and radial hole 22 of the motor shaft 2 plays an important role in enabling the vacuum pump to perform the gas filling function.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A motor structure, characterized in that, The device includes a motor housing, a rotor, a stator, a motor shaft, and a motor base. The motor base is connected to the bottom of the motor housing. The motor housing and the motor base define a motor cavity. The stator is disposed in the motor cavity and fixed to the inner wall of the motor housing. The motor shaft extends longitudinally through the motor cavity, with its upper end extending beyond the top of the motor housing and its lower end extending to the motor base. The rotor is disposed in the motor cavity and fixed to the motor shaft. The motor shaft has an axial hole along its axial direction, with its upper end extending to the top of the motor shaft. The motor shaft also has a radial hole along its radial direction, with the inner end of the radial hole communicating with the air passage of the axial hole. An air intake gap communicating with the outside air passage is provided between the motor housing and the motor base. The outer end of the radial hole communicates with the air intake gap through the motor cavity.

2. The motor structure according to claim 1, characterized in that, The radial hole is located inside the motor cavity.

3. The motor structure according to claim 2, characterized in that, The radial hole is located above or below the rotor mounting position.

4. The motor structure according to claim 1, characterized in that, The axial hole is located at the center of the motor shaft.

5. The motor structure according to claim 1, characterized in that, The motor base is provided with a base limiting hole corresponding to the position of the motor shaft, and the lower end of the motor shaft extends into the base limiting hole.

6. The motor structure according to claim 1, characterized in that, The bottom of the motor housing is open, and the motor base is embedded in the opening of the motor housing.

7. The motor structure according to claim 6, characterized in that, The air intake gap is arranged around the periphery of the motor base.

8. The motor structure according to claim 1, characterized in that, The inner diameter of the axial hole is one-third to one-fifth of the diameter of the motor shaft.

9. The motor structure according to claim 1, characterized in that, A circular boss extends upward from the top center of the motor housing.

10. An automatic filling and emptying vacuum pump, characterized in that, It includes a pump body and a motor structure as described in any one of claims 1-9.

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