Motor structure and automatic inflation and exhaust vacuum pump

Abstract

The utility model discloses a motor structure and an automatic inflation and deflation vacuum pump, the motor structure comprises a motor shell, a rotor, a stator, a motor shaft and a motor base, the motor base is connected to the bottom of the motor shell, a motor cavity is defined by the motor shell and the motor base, the stator is arranged in the motor cavity and fixed on the inner side wall of the motor shell, and the motor shaft is arranged in the motor cavity. The motor shaft longitudinally penetrates through the motor cavity, 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, and a longitudinal through hole is formed in the motor shaft in the length direction in a penetrating mode. The longitudinal through hole is formed in the motor shaft of the motor, when the motor is applied to the vacuum pump, external air can be introduced into the pump body through the longitudinal through hole, so that the inflation function is achieved, the pump body does not need to be improved, the design complexity of the pump body is reduced, and meanwhile, the service life of the pump body is prolonged. And the formed longitudinal through hole ensures that the motor shaft still has better mechanical strength.

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 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 a longitudinal through hole along its length.

[0006] A further technical solution is that the longitudinal through hole is arranged at the center of the motor shaft.

[0007] The further technical solution is as follows: the motor base is provided with a through hole corresponding to the position of the motor shaft, and the lower end of the motor shaft extends into the through hole.

[0008] The further technical solution is as follows: the base through hole includes an upper hole section and a lower hole section, a stepped portion is formed between the upper hole section and the lower hole section, and the lower end of the motor shaft extends to the bottom of the upper hole section and abuts against the stepped portion.

[0009] A further technical solution is that the diameter of the upper hole section is larger than the diameter of the lower hole section.

[0010] A further technical solution is that the lower hole segment and the upper hole segment may have the same or different shapes.

[0011] The further technical solution is that the inner diameter of the longitudinal through hole is one-third to one-fifth of the diameter of the motor shaft.

[0012] 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.

[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 to 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 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. A longitudinal through hole is provided through the motor shaft along its length. By utilizing the longitudinal through hole in the motor shaft itself, when applied to a vacuum pump, the longitudinal through hole allows outside air to enter the pump body, thereby achieving the inflation function. No modifications to the pump body are required, reducing the design complexity of the pump body. At the same time, since the longitudinal through hole is provided along the length of the motor shaft, the motor shaft still maintains good mechanical strength, and even with a smaller diameter motor shaft, it still meets the usage requirements. Furthermore, the design utilizes the original structure of the motor itself, requiring no major modifications to the motor, making the functionality 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 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. Longitudinal through hole; 3. Rotor; 4. Motor base; 41. Base through 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; 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. The motor housing 1 and the 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. The upper end of the motor shaft 2 extends beyond the top of the motor housing 1, and the lower end of the motor shaft 2 extends 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 a longitudinal through hole 21 extending through it along its length.

[0029] By utilizing the motor shaft 2 of the motor itself to open a longitudinal through hole 21, when applied in a vacuum pump, the longitudinal through hole 21 can 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. At the same time, since the longitudinal through hole 21 is opened along the length direction of the motor shaft 2, the motor shaft 2 is guaranteed to still have good mechanical strength, and even if a motor shaft 2 with a smaller diameter is selected, it still meets the usage requirements.

[0030] Preferably, the longitudinal through hole 21 is arranged at the center of the motor shaft 2 to facilitate machining and connection with other components.

[0031] like Figures 1-2 As shown, the motor base 4 has a through hole 41 corresponding to the position of the motor shaft 2, and the lower end of the motor shaft 2 extends into the through hole 41. The purpose of the through hole 41 is twofold: firstly, to limit and fix the motor shaft 2; and secondly, to form an air passage with the outside, facilitating gas to enter the longitudinal through hole 21 of the motor shaft 2 from the through hole 41.

[0032] In this embodiment, the base through hole 41 includes an upper hole section and a lower hole section, and a step is formed between the upper hole section and the lower hole section. The diameter of the upper hole section is larger than the diameter of the lower hole section. The lower end of the motor shaft 2 extends to the bottom of the upper hole section and abuts against the step. The step serves to support and limit the lower end of the motor shaft 2.

[0033] The lower and upper hole sections may have the same or different shapes. In this embodiment, both the lower and upper hole sections are circular holes. In other embodiments, the upper hole section is a circular hole, while the lower hole section may be a directional hole or an elliptical hole, etc.

[0034] Preferably, the inner diameter of the longitudinal through 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 longitudinal through 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 motor shaft 2 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.

[0035] In this embodiment, 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 embedding method, the length of the motor is reduced without affecting the performance of the motor, making the structure of the motor more compact.

[0036] 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.

[0037] 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, and 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. The valve body 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 longitudinal through 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.

[0038] 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, thereby blocking the air guide hole 561. At this time, the external airflow cannot be introduced into the pump chamber 59 through the longitudinal through 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 through the longitudinal through hole 21 and the air inlet 562, so that the longitudinal through hole 21, the air inlet 562, the pump chamber 59 and the charging / discharging port 511 form an air passage to realize the inflation function. It can be seen that the longitudinal through hole 21 of the motor shaft 2 plays an important role in enabling the vacuum pump to perform the gas filling function.

[0039] 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. The upper end of the motor shaft extends beyond the top of the motor housing, and the lower end of the motor shaft extends to the motor base. The rotor is disposed in the motor cavity and fixed to the motor shaft. The motor shaft has a longitudinal through hole along its length.

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

3. The motor structure according to claim 1, characterized in that, The motor base has a through hole corresponding to the position of the motor shaft, and the lower end of the motor shaft extends into the through hole.

4. The motor structure according to claim 3, characterized in that, The base through hole includes an upper hole section and a lower hole section, and a stepped portion is formed between the upper hole section and the lower hole section. The lower end of the motor shaft extends to the bottom of the upper hole section and abuts against the stepped portion.

5. The motor structure according to claim 4, characterized in that, The diameter of the upper hole section is larger than the diameter of the lower hole section.

6. The motor structure according to claim 4, characterized in that, The lower hole section and the upper hole section may have the same or different shapes.

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

8. 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.

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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