A waterproof sealing structure

Abstract

The present invention relates to a waterproof sealing structure, comprising a fixed housing (2) and a motor end cover (14), characterized in that it also comprises an outer cylinder (21) integrally connected to the fixed housing (2) and extending outward along the axis, an inner cylinder (141) integrally connected to the motor end cover (14) and extending outward along the axis, a rotating shaft (5) arranged between the fixed housing (2) and the motor end cover (14), a locking nut (8) fixing the rotating shaft (5), the inner cylinder (141) arranged in the outer cylinder (21), a step (22) integrally designed in the outer cylinder (21), and an oil seal (6) and a water seal (7) arranged in the outer cylinder (21) below the step (22); the present invention has good waterproof performance and is durable, and is particularly suitable for waterproof sealing of water surface aerators, impellers or mixers, etc. Compared with previous sealing components, it has great innovation.

Description

Technical Field

[0001] The invention relates to the technical field of water sealing, and in particular to a waterproof sealing structure. Background Art

[0002] In underwater mechanical equipment, due to the harsh environment in which the equipment is used, sealing design is usually required in the product structure. Especially for the parts of the equipment involving motors or electronic equipment, the most common sealing requirement is waterproof sealing. For example, surface aerators used in the agricultural field and the bottom impeller parts of ships all require sealing components, especially the parts of the wading rotating parts.

[0003] For water surface aerators, the durability of the waterproof structure of the current technology is poor. Because operations on the water surface may not only be damaged by water, but also the internal sealing components may be aged and damaged due to sunlight, resulting in water leakage. The current water surface aerators usually have a short overall lifespan due to poor waterproof and durability. Summary of the invention

[0004] The present invention aims at the waterproof sealing problem, redesigns the sealing structure, and designs three waterproof structures. When dealing with harsh environments, even if one of the waterproof structures is damaged, it still plays a waterproof role, thereby greatly improving the durability of waterproofing. In addition, the waterproof sealing structure proposed by the present invention also has the characteristics of good sealing performance and low manufacturing cost, and is particularly suitable for use in water surface aerators or underwater rotors.

[0005] A waterproof sealing structure comprises a fixed shell and a motor end cover, and also comprises an outer cylinder body integrally connected to the fixed shell and extending outward along the axis, an inner cylinder body integrally connected to the motor end cover and extending outward along the axis, a rotating shaft placed between the fixed shell 2 and the motor end cover, a locking nut fixing the rotating shaft, the inner cylinder body placed in the outer cylinder body, a step is integrally designed in the outer cylinder body, an oil seal is arranged in the outer cylinder body corresponding to the lower part of the step, a threading hole is arranged in the middle of the rotating shaft, a shaft shoulder is arranged in the middle side, a water seal is arranged on the rotating shaft corresponding to the lower part of the shaft shoulder, and a spring is sleeved inside the oil seal.

[0006] Furthermore, the oil seal comprises an oil seal outer ring, and the elastic force of the spring forces the oil seal to be tightened inward, that is, the oil seal inner ring of the oil seal is pressed against the circumferential surface of the inner cylinder, and the oil seal is made of rubber or polyurethane material.

[0007] Furthermore, the water seal comprises a cylindrical portion and a conical portion, the cylindrical portion and the conical portion are connected as a whole, the water seal is made of rubber or polyurethane material, the water seal is sleeved on the rotating shaft, and the bottom of the water seal supports the upper edge of the inner cylinder.

[0008] Furthermore, one end of the rotating shaft is provided with a thread, a threading hole is provided in the center of the rotating shaft, a shaft shoulder is provided in the middle side, and the lower section of the shaft shoulder is a rotating section. The locking nut is sleeved on the thread to fix the fixed shell and the rotating shaft together. At the same time, a first O-ring and a second O-ring are provided at the two ends where the fixed shell contacts the rotating shaft.

[0009] Furthermore, in the working state, the motor end cover rotates relative to the fixed shell. At the same time, according to the principle of relative motion, the fixed shell rotates relative to the motor end cover. The motor end cover serves as a part of the motor, and the fixed shell serves as a shell in other external equipment or as an independent sealing component.

[0010] Furthermore, the first O-ring is on the rotating shaft, the first O-ring is below the shaft shoulder of the rotating shaft and above it is a fixed housing, the second O-ring is sleeved over the rotating shaft, the second O-ring is above the screw and below it is the rotating shaft, the second O-ring has the same structure as the first O-ring and both are O-rings made of rubber or polyurethane material.

[0011] Furthermore, the inner cylinder body generates a rotational motion relative to the rotating shaft, and lubricating oil is provided in the closed space formed by the step, the inner cylinder body and the oil seal.

[0012] The benefit of the present invention is that the oil seal is used as the first waterproof component, the water seal is used as the second waterproof component, and the first O-ring is used as the third waterproof component, which cooperate with each other and are reasonably matched in structure to form a good sealing effect. At the same time, even if one of the waterproof components is damaged, the waterproof effect can still be achieved, thereby greatly improving the durability of the waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a central cross-sectional schematic diagram of a waterproof sealing structure according to the first embodiment of the present invention.

[0014] Figure 2 yes Figure 1 Enlarged schematic diagram of the middle circle A.

[0015] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure of the middle oil seal 6.

[0016] Figure 4 yes Figure 1 A schematic diagram of the enlarged cross-section structure of the middle water seal 7.

[0017] Figure 5 yes Figure 1 Schematic diagram of the enlarged cross-section structure of the fixed shell 2.

[0018] Figure 6 yes Figure 1 A schematic diagram of the cross-sectional enlarged structure of the rotating shaft 5.

[0019] Figure 7 It is a central cross-sectional schematic diagram of a waterproof sealing structure of the second embodiment of the present invention.

[0020] Legend: fixed housing 2, motor end cover 14, outer cylinder 21, inner cylinder 141, rotating shaft 5, locking nut 8, step 22, oil seal 6, threading hole 54, shaft shoulder 51, water seal 7, spring 15, oil seal outer ring 61, oil seal inner ring 62, cylindrical part 71, conical part 72, first O-ring 23 and second O-ring 24. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0022] See also Figure 1-6 , showing a waterproof sealing structure of the first embodiment, comprising a fixed shell 2 and a motor end cover 14, and also comprising an outer cylinder 21 integrally connected to the fixed shell 2 and extending outward along the axis, an inner cylinder 141 integrally connected to the motor end cover 14 and extending outward along the axis, a rotating shaft 5 arranged between the fixed shell 2 and the motor end cover 14, and a locking nut 8 for fixing the rotating shaft 5 and the fixed shell 2; the inner cylinder 141 is arranged in the outer cylinder 21, a step 22 is integrally designed in the outer cylinder 21, an oil seal 6 is arranged in the outer cylinder 21 below the step 22, a threading hole 54 is arranged in the middle of the rotating shaft 5, a shaft shoulder 51 is arranged in the middle side, a water seal 7 is arranged on the rotating shaft 5 below the shaft shoulder 51, and a spring 15 is sleeved in the oil seal 6.

[0023] like Figure 3 , a schematic diagram of the structural cross-section of the oil seal 6, the oil seal 6 comprises an oil seal outer ring 61 and an oil seal inner ring 62, the oil seal outer ring 61 and the oil seal inner ring 62 are connected as a whole, the cross-sectional shape of the oil seal inner ring 62 is an Arabic numeral "7" shape, a spring 15 is sleeved on the oil seal outer ring 61 and the oil seal inner ring 62, the elastic force of the spring 15 forces the oil seal 6 to be tightened inward, that is, the oil seal inner ring 62 of the oil seal 6 is pressed against the circumferential surface of the inner cylinder 141, the oil seal 6 is made of rubber or polyurethane material, which has certain elasticity and wear resistance. In the actual waterproof process, the oil seal 6 is the first waterproof component, that is, the oil seal 6 can directly contact water, specifically, the bottom of the oil seal 6 can contact water, the oil seal 6 can block water, the shape of the oil seal inner ring 62 is particularly suitable for fixing the spring 15 so that the spring 15 will not slide at will, and the shape of the Arabic numeral "7" is similar to a hook, which clamps the spring 15, and is also very convenient during installation.

[0024] like Figure 4The water seal 7 includes a cylindrical portion 71 and a conical portion 72, which are connected as a whole. The water seal 7 is made of rubber or polyurethane material. The water seal 7 is sleeved on the rotating shaft 5. The lower part of the water seal 7 supports the upper edge of the inner cylinder 141. Specifically, the lower part of the conical portion 72 of the water seal 7 supports the upper edge of the inner cylinder 141. The shape of the conical portion 72 is as follows: Figure 4 , a cone shape is formed below it, the cylindrical portion 71 and the cone portion 72 are elastic in the vertical direction, which is convenient for blocking water when compressed. The water seal 7 is the second waterproof structure. The shape of the water seal 7 is very different from that of an ordinary O-ring. When the oil seal 6 is intact, the water seal 7 cannot contact water, causing the oil seal 6 to block water. When the oil seal 6 is about to penetrate with water, the water seal 7 can block the water and prevent water from entering the fixed housing 2 and the motor end cover 14.

[0025] Specifically, Figure 6 , a thread 53 is provided at one end of the rotating shaft 5, a threading hole 54 is provided in the center of the rotating shaft 5, a shaft shoulder 51 is provided at the middle side, and a section below the shaft shoulder 51 is a rotating section 52, such as Figure 2 In the embodiment, the locking nut 8 is sleeved on the thread 53 to fix the fixed housing 2 and the rotating shaft 5 together. The advantage of setting the locking nut 8 is that it is more convenient during assembly and disassembly.

[0026] like Figure 5 and Figure 2 , Figure 5 It is a partial cross-sectional view of the fixed housing 2. A first O-ring 23 and a second O-ring 24 are provided at the two ends where the fixed housing 2 contacts the rotating shaft 5. The first O-ring is on the rotating shaft 5. Below the first O-ring is a shaft shoulder 51 of the rotating shaft 5 and above it is the fixed housing 2. The shaft shoulder 51 has the function of supporting the fixed housing 2. In the actual processing process, it is important to set the dimensions of the shaft shoulder 51 and the fixed housing 2 so that their dimensions match. The second O-ring covers the rotating shaft 5. Above the second O-ring is a screw and below it is the rotating shaft 5. The second O-ring 24 has the same structure as the first O-ring 23 and is an O-ring made of rubber or polyurethane material. The first O-ring 23 plays a sealing and waterproof role to prevent water from entering the fixed housing 2. Usually, the first O-ring 23 cannot come into contact with water. Only when the oil seal 6 and the water seal 7 are damaged at the same time and leak, can the first O-ring 23 come into contact with water. The first O-ring 23 is the third waterproof structure.

[0027] Specifically, in the working state, the motor end cover 14 rotates relative to the fixed housing 2. At the same time, according to the principle of relative motion, the fixed housing 2 rotates relative to the motor end cover 14. The motor end cover 14 serves as a part of the motor, and the fixed housing 2 serves as a housing in other external equipment or as an independent sealing component.

[0028] Specifically, the inner cylinder 141 will produce rotational motion relative to the rotating shaft 5. Lubricating oil is provided in the closed space formed by the step 22, the inner cylinder 141 and the oil seal 6. The inner cylinder 141 is in direct contact and friction with the rotating shaft 5. If there is no lubricating oil, it is easy to produce greater wear. Therefore, placing the lubricating oil in the period can reduce wear and improve the durability of the waterproof structure. The oil seal 6 can seal the lubricating oil under the step 22, and the lubricating oil is not easy to leak. The lubricating oil is usually selected as a solid lubricating oil, which is insoluble in water, and therefore can also play a role in water blocking. In this structure, the route by which water can enter the motor end cover 14 is blocked one by one by the oil seal 6, the lubricating oil and the water seal 7. The waterproof performance of each structure is very good, and even if any waterproof structure is damaged, there will be no water leakage. Therefore, the durability of this waterproof structure is very good.

[0029] The specific implementation steps of the first embodiment are to install the waterproof sealing structure in the motion shaft that needs to be waterproof. The first embodiment is installed in the water surface aerator or two shells, wherein the motor end cover 14 is equipped with a motor.

[0030] The fixed shell 2 is equipped with other parts that do not contact water. The motor drives the rotating shaft 5 to rotate. When the rotating shaft 5 is fixed, the motor end cover 14 rotates, and the motor end cover 14 rotates together with the inner cylinder 141. When there is water between the motor end cover 14 and the fixed shell 2, the water will contact the oil seal 6, and the oil seal 6 will block the water, so the water will not contact the gap between the inner cylinder 141 and the rotating shaft 5. As time goes by, the oil seal 6 may leak water back, but the water seal 7 isolates the water, so that the water cannot reach the gap between the inner cylinder 141 and the rotating shaft 5, so it cannot enter the inner cylinder 141, nor the motor end cover 14, and even more cannot enter the fixed shell 2. Therefore, the waterproof protection of the fixed shell 2 and the motor end cover 1 will be better.

[0031] like Figure 7 , is the second embodiment, which is basically the same as the first embodiment, except that the fixed housing 2 is changed to a non-fixed housing 2a which is an independent component, and the rotating part is a rotating shaft 4a, and the waterproof characteristics are the same. Specifically, there is a motor housing 1a, and a rotating shaft 4a is arranged in the center of the motor housing 1a. A fastening screw 3a is arranged on the rotating shaft 4a, and the fastening screw 3a fixes the non-fixed housing 2a and the rotating shaft 4a together. An oil seal 5a and a water seal 7a are arranged below the non-fixed housing 2a, and a shaft shoulder 8a is arranged on the rotating shaft 4a. There is no threading hole in the center of the rotating shaft 4a, and a spring 6a is arranged on the oil seal 5a. A step is arranged below the non-fixed housing 2a. The oil seal, water seal and O-ring of the second embodiment are exactly the same as those of the first embodiment, so they will not be described further. The first embodiment and the second embodiment are different. The first embodiment is suitable for equipment such as surface aerators, while the second embodiment is suitable for underwater impellers, or liquid mixers and other equipment.

[0032] The present invention has the characteristics of good waterproof performance and durability, and is a great improvement compared to the existing sealing structure. In production, the cost is not high, the manufacturing of each part is not very complicated, and the installation is convenient. Therefore, the present invention is more suitable for promotion.

[0033] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A waterproof sealing structure, comprising a fixed housing (2) and a motor end cover (14), characterized in that: It also comprises an outer cylinder (21) integrally connected to the fixed housing (2) and extending outward along the axis, an inner cylinder (141) integrally connected to the motor end cover (14) and extending outward along the axis, a rotating shaft (5) disposed between the fixed housing (2) and the motor end cover (14), a locking nut (8) for fixing the rotating shaft (5), the inner cylinder (141) disposed inside the outer cylinder (21), a step (22) integrally designed inside the outer cylinder (21), an oil seal (6) disposed inside the outer cylinder (21) corresponding to the lower part of the step (22), a threading hole (54) disposed in the middle of the rotating shaft (5), a shaft shoulder (51) disposed at the middle side of the rotating shaft (5), a water seal (7) disposed on the rotating shaft (5) corresponding to the lower part of the shaft shoulder (51), and a spring (15) sleeved inside the oil seal (6); The oil seal (6) comprises an oil seal outer ring (61) and an oil seal inner ring (62), and the oil seal outer ring (61) and the oil seal inner ring (62) are connected to form a whole; The cross-sectional shape of the oil seal inner ring (62) is an Arabic numeral "7" shape. A spring (15) is sleeved between the oil seal outer ring (61) and the oil seal inner ring (62). The elastic force of the spring (15) forces the oil seal (6) to tighten inward, that is, the oil seal inner ring (62) of the oil seal (6) is pressed against the circumferential surface of the inner cylinder (141). The oil seal (6) is made of rubber or polyurethane material. The water seal (7) comprises a cylindrical portion (71) and a conical portion (72), the cylindrical portion (71) and the conical portion (72) being connected as a whole, the water seal (7) being made of rubber or polyurethane material, the water seal (7) being sleeved on the rotating shaft (5), and the lower part of the water seal (7) being against the upper edge of the inner cylinder (141); One end of the rotating shaft (5) is provided with a thread (53), a threading hole (54) is provided in the center of the rotating shaft (5), a shaft shoulder (51) is provided at the middle side, and a section below the shaft shoulder (51) is a rotating section (52). The locking nut (8) is sleeved on the thread (53) to fix the fixed housing (2) and the rotating shaft (5) together. At the same time, a first O-ring (23) and a second O-ring (24) are provided at the two ends of the fixed housing (2) that contact the rotating shaft (5).

2. A waterproof sealing structure according to claim 1, characterized in that: In the working state, the motor end cover (14) performs rotational motion relative to the fixed housing (2). At the same time, according to the principle of relative motion, the fixed housing (2) performs rotational motion relative to the motor end cover (14). The motor end cover (14) serves as a part of the motor, and the fixed housing (2) serves as a housing in other external equipment or as an independent sealing component.

3. A waterproof sealing structure according to claim 1, characterized in that: The first O-ring (23) is on the rotating shaft (5); the first O-ring (23) has a shaft shoulder (51) of the rotating shaft (5) below it and a fixed housing (2) above it; the second O-ring (24) covers the rotating shaft (5); the second O-ring (24) has a screw above it and the rotating shaft (5) below it; the second O-ring (24) and the first O-ring (23) have the same structure and are both O-rings made of rubber or polyurethane.

4. A waterproof sealing structure according to claim 1, characterized in that: The inner cylinder (141) generates a rotational motion relative to the rotating shaft (5), and lubricating oil is provided in a closed space formed by the step (22), the inner cylinder (141) and the oil seal (6).

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