HA type spring combined oil seal

Abstract

The utility model belongs to the technical field of oil seal parts, and particularly discloses an HA type spring combined oil seal, the upper end face of an oil seal body is provided with an annular spring groove, a circle of main oil seal arm is formed on the inner wall of the oil seal body, the main oil seal arm is provided with a main lip, a circle of V-shaped spring is clamped in the spring groove, and the V-shaped spring is connected with the main lip. A circle of pressurizing groove is formed in the inner wall of the oil seal body, the side wall, away from the main oil seal arm, of the pressurizing groove inclines and bends towards the interior of the oil seal body to form an auxiliary oil seal arm, an auxiliary lip is arranged on the auxiliary oil seal arm, and an O-shaped ring is arranged outside the oil seal body in a sleeving mode. The main lip is used for primary sealing, the auxiliary lip is used for secondary sealing, through the design of the double oil seal structure, medium leakage can be effectively prevented, the sealing performance can be improved, and even under the environment of high pressure, high rotating speed and low temperature, the good sealing performance can be kept, and the situation that the safety of an aircraft is endangered due to oil pump sealing failure can be prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil seals, and in particular relates to an HA type spring combined oil seal. Background Art

[0002] With the rapid development of modern aviation industry, the performance requirements of various aircraft components are increasing day by day, especially in the oil pump, the rotary sealing system of the shaft (diameter is 12mm) and the housing (mounting hole diameter is 22mm, height is 7mm), which faces particularly severe challenges. Aircraft oil pumps not only need to maintain long-term stable operation under high speed (14000 rpm), high pressure (0.18~0.21MPa) and wide temperature range (-40℃~80℃), but also need to ensure zero leakage of sealing medium (such as 3# aviation kerosene) to ensure the safety and reliability of the aircraft.

[0003] The existing elastomeric rotating shaft lip seal design often seems to be unable to cope with the above extreme working conditions. The dynamic friction and wear caused by high speed, the maintenance of sealing performance under high pressure, and the stability of material performance under extreme temperatures are all difficult problems that are difficult to effectively solve in existing oil seal designs. Especially at high speeds (such as: 14000 rpm) and low temperature environments (such as: -40℃), the material properties of ordinary seals drop sharply, the sealing effect is greatly reduced, and it may even cause the oil pump to fail, thereby endangering the safety of the aircraft.

[0004] Therefore, the inventor is committed to designing a combined oil seal to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an HA type spring combined oil seal, which can effectively prevent medium leakage, improve sealing performance, and maintain good sealing performance even in high pressure, high speed and low temperature environments.

[0006] In order to achieve the above object, a technical solution adopted by the utility model is:

[0007] A HA type spring combination oil seal comprises an annular oil seal body, an annular spring groove is arranged on the upper end surface of the oil seal body and a circle of main oil seal arms are formed on the inner wall of the oil seal body, the main oil seal arm is provided with a main lip, a circle of V-shaped spring is clamped in the spring groove, a circle of boosting groove is arranged on the inner wall of the oil seal body, the boosting groove is inclined and bent away from the side wall of the main oil seal arm into the oil seal body to form a secondary oil seal arm, the secondary oil seal arm is provided with a secondary lip, and an O-ring is arranged on the outer sleeve of the oil seal body.

[0008] As an improvement of the HA type spring combined oil seal of the utility model, the root of the auxiliary oil seal arm is located on the lower end of the oil seal hole of the oil seal body.

[0009] As an improvement of the HA type spring combined oil seal of the utility model, the boosting groove is obliquely opened on the inner wall of the oil seal body to form an inclined surface.

[0010] As an improvement of the HA type spring combined oil seal of the utility model, the diameter of the auxiliary lip is smaller than the root diameter of the auxiliary oil seal arm.

[0011] As an improvement of the HA type spring combined oil seal of the utility model, the main oil seal arm is arranged to be inclined toward the oil seal body, and the inclination direction of the inclined surface is opposite to the inclination direction of the main oil seal arm.

[0012] As an improvement of the HA spring combination oil seal of the utility model, an arc-shaped protrusion is arranged on the inner wall of the main oil seal arm to form a circle of the main lip, and the diameter of the main lip is greater than the diameter of the auxiliary lip.

[0013] As an improvement of the HA type spring combined oil seal of the utility model, the auxiliary oil seal arm is integrally formed with the oil seal body, and the auxiliary oil seal arm is formed into an arc shape by heating a circle of straight arms and then bending them through a jig.

[0014] As an improvement of the HA type spring combined oil seal of the utility model, the main oil seal arm is 0.1mm-0.3mm lower than the corresponding end surface of the oil seal body.

[0015] As an improvement of the HA spring combination oil seal of the utility model, a circle of grooves is provided on the outer wall of the oil seal body, the O-ring is located in the groove, and the inner diameter of the O-ring is smaller than the bottom diameter of the groove.

[0016] As an improvement of the HA type spring combination oil seal of the utility model, the spring groove is coaxially arranged with the oil seal body, a retaining position is provided on the inner wall of the spring groove, the inner end and the outer end of the V-shaped spring are both bent upward to form a V shape and the ends of the two are pressed against the retaining position, and a plurality of grooves are spaced and staggered on the inner end and the outer end of the V-shaped spring to form a plurality of spring sheets connected together.

[0017] Compared with the prior art, the HA spring combination oil seal of the utility model adopts an annular oil seal body structure, and an annular spring groove is set on its upper end surface to accommodate the V-shaped spring. The existence of the V-shaped spring can not only provide sufficient preload force to ensure the close fit between the oil seal and the sealing surface, but also generate a reverse force when the oil seal is under pressure, further improving the sealing effect. At the same time, a circle of main oil seal arms and a circle of boosting grooves are set on the inner wall of the oil seal body, and a secondary oil seal arm formed by the side wall of the boosting groove. The main lip is used for primary sealing and the secondary lip is used for secondary sealing. The design of this double oil seal structure can effectively prevent medium leakage and improve sealing performance. Even in high pressure, high speed and low temperature environment, it can maintain good sealing performance to prevent the oil pump seal from failing, thereby endangering the safety of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the HA type spring combined oil seal of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of the oil seal body of the utility model;

[0020] Figure 3 It is a machined cross-sectional view of the oil seal body of the utility model;

[0021] Figure 4 It is a cross-sectional view of the oil seal body of the utility model;

[0022] Figure 5 It is a cross-sectional view of the O-ring of the utility model;

[0023] Figure 6 It is a three-dimensional diagram of the V-shaped spring of the utility model in the installed state;

[0024] Figure 7 It is a top view of the V-shaped spring of the utility model in the installed state.

[0025] Illustration Description:

[0026] 1. Oil seal body; 11. Spring groove; 111. Positioning; 12. Groove; 13. Main oil seal arm; 131. Main lip; 14. Auxiliary oil seal arm; 141. Auxiliary lip; 15. Boosting groove; 151. Inclined surface; 2. V-shaped spring; 21. First groove; 22. Second groove; 23. Spring piece; 3. O-ring. DETAILED DESCRIPTION

[0027] The following is a detailed explanation of the implementation of the present invention in conjunction with the accompanying drawings. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of the present invention.

[0028] Reference Figures 1 to 7A HA type spring combination oil seal comprises an annular oil seal body 1, a circle of V-shaped spring 2 and an annular O-ring 3. An annular spring groove 11 is arranged on the upper end surface of the oil seal body 1 and a circle of main oil seal arm 13 is formed on the inner wall of the oil seal body 1. The main oil seal arm 13 is provided with a main lip 131. A circle of V-shaped spring 2 is clamped in the spring groove 11. A circle of boosting groove 15 is arranged on the inner wall of the oil seal body 1. The side wall of the boosting groove 15 away from the main oil seal arm 13 is inclined and bent toward the inside of the oil seal body 1 to form a circle of auxiliary oil seal arm 14. The auxiliary oil seal arm 14 is provided with an auxiliary lip 141. The O-ring 3 is sleeved outside the oil seal body 1.

[0029] Reference Figures 2 to 4 The center of the oil seal body 1 is provided with an oil seal hole, so that the entire oil seal body 1 is annular, the spring groove 11 is located on the top surface of the oil seal body 1, the spring groove 11 is coaxially arranged with the oil seal body 1, the side wall of the lower end of the spring groove 11 is inclined, and a clamping position 111 is provided on the inner wall of the upper end of the spring groove 11, and the clamping position 111 can prevent the V-shaped spring 2 from sliding out of the spring groove 11 during the use of the oil seal, and the main oil seal arm 13 is inclined toward the oil seal hole of the oil seal body 1, and the main oil seal arm 13 is 0.1mm-0.3mm lower than the upper end surface of the oil seal body 1, so that the main oil seal arm 13 and the upper end surface of the oil seal body 1 form a height difference, ensuring the oil pressure preload The main oil seal arm 13 is provided with an arc-shaped protrusion on the inner wall to form a circle of main lip 131. The main oil seal arm 13 can form a primary seal with the shaft of the oil pump through the circle of main lip 131. Specifically, the main oil seal arm 13 can make the main lip 131 position itself have a certain strength and softness, ensuring that it can withstand a certain pressure and adapt to a small amount of shaft runout. The root of the main oil seal arm 13 and the shaft adopt a clearance fit to reduce the contact area between the oil seal and the shaft. The main oil seal arm 13 is tilted to reduce the contact area between the oil seal and the shaft, and can achieve an excellent sealing effect while reducing the friction with the shaft and the torque required for shaft rotation. In addition, the degree of closeness between the lip and the shaft can be adjusted according to the degree of activation. When the medium pressure on the high-pressure side of the oil seal is small, the main oil seal arm 13 is not activated or the activation degree is low. At this time, the main lip 131 and the shaft are only tightly attached to the shaft by the interference fit and the preload force of the V-spring 2. Although it can only resist the leakage of the medium with a relatively small pressure, the corresponding friction between the shaft and the main lip 131 is also small, and the shaft torque is small, which can achieve the purpose of energy saving. When the medium pressure on the high-pressure side of the oil seal is large, the main lip 131 is highly activated. At this time, in addition to being tightly attached to the shaft by the interference fit and the preload force of the V-spring 2, the high-pressure medium in the groove of the V-spring 2 pushes the inner wall of the oil seal toward the shaft. Various factors together cause the main lip 131 to be tightly attached to the shaft, and at this time, the leakage of the medium with a relatively large pressure can be resisted.

[0030] Reference Figures 2 to 4The boost groove 15 is obliquely opened on the inner wall of the oil seal body 1 and forms an inclined surface 151. The inclined direction of the inclined surface 151 is opposite to the inclined direction of the main oil seal arm 13 (the main oil seal arm 13 is inclined toward the inside of the oil seal hole of the oil seal body 1, while the inclined surface 151 is inclined outward). A circle of auxiliary oil seal arms 14 is located at the lower end of the oil seal body 1. The entire auxiliary lip 141 is coaxially arranged with the oil seal body 1. The auxiliary oil seal arm 14 is roughly arc-shaped and its root is located on the lower end surface of the oil seal body 1. A circle of auxiliary lip 141 is provided at the end of the auxiliary oil seal arm 14. The diameter b of the auxiliary lip 141 is smaller than the root diameter of the auxiliary oil seal arm 14. The diameter a of the main lip 131 is larger than the diameter b of the auxiliary lip 141 of the auxiliary oil seal arm 14. The auxiliary oil seal arm 14 is integrally formed with the oil seal body 1. The auxiliary oil seal arm 14 is formed by heating a circle of straight arms and then bending them through a jig ("enlarging" processing and finalizing) (such as Figure 3 As shown in the figure, the processing design of the auxiliary oil seal arm 14 is relatively simple, and the auxiliary oil seal arm 14 processed in this way has undergone a process of being "stretched up" and has some internal stress inside. In actual use, this part of the internal stress will also play a certain role. The auxiliary oil seal arm 14 of the utility model can also adjust the degree of closeness between it and the rotating shaft according to its own activation degree. When the medium pressure on the high-pressure side of the oil seal (i.e., the upper end) is small, the auxiliary oil seal arm 14 is not activated or the activation degree is low. At this time, the auxiliary oil seal arm 14 and the rotating shaft are only close to the shaft by their own interference fit and spring preload. Although it can only resist the leakage of the medium with a relatively small pressure, at this time, the friction between the corresponding rotating shaft and the auxiliary oil seal arm 14 is also small, and the shaft torque is small, which can achieve the purpose of energy saving. When the medium pressure on the high-pressure side of the oil seal is high, the auxiliary oil seal arm 14 is activated to a higher degree. At this time, the auxiliary oil seal arm 14 is tightly attached to the rotating shaft due to its own interference fit and the spring preload force. In addition, the high-pressure medium in the spring groove 11 pushes the inner wall of the oil seal toward the rotating shaft. Various factors together cause the auxiliary oil seal arm 14 to be tightly attached to the shaft. At this time, the leakage of medium with higher pressure can be resisted. The entire auxiliary oil seal arm 14 can form a secondary seal with the shaft of the oil pump through the auxiliary lip 141.

[0031] Reference Figure 1 and Figure 5 A circle of grooves 12 are provided on the outer wall of the oil seal body 1, and the O-ring 3 is located in the groove 12. The inner diameter of the O-ring 3 is smaller than the bottom diameter of the groove 12. Since the cross-sectional diameter of the O-ring 3 is larger than the depth of the groove 12, when the outer shell is sleeved outside the oil seal body 1, the O-ring 3 is compressed first, and then the outer wall of the oil seal body 1 is compressed. Therefore, in the utility model, the O-ring 3 can not only be used to enhance the sealing effect of the outer side of the oil seal body 1, but also increase the static friction between the outer side of the sealing ring and the outer shell, further avoiding the phenomenon that the sealing ring is dragged into rotation and slips when the shaft rotates.

[0032] Reference Figure 1, Figure 6 and Figure 7 The V-shaped spring 2 is in a long strip shape before installation. It needs to be bent before being installed in the spring groove 11. The inner and outer ends of the V-shaped spring 2 are bent upward in the same direction to form a V shape, and the ends of the two press against the clamping position 111 of the spring groove 11. The opening direction of the V-shaped spring 2 is the same as the opening direction of the spring groove 11. The inner and outer ends of the V-shaped spring 2 are spaced and staggered with multiple grooves to form multiple spring pieces 23 connected together. The multiple grooves are specifically multiple first grooves 21 and multiple second grooves 22. The multiple first grooves 21 are arranged at the outer end of the V-shaped spring 2 in a circle, and the multiple second grooves 22 are arranged at the inner end of the V-shaped spring 2 in a circle. The first groove 21 and the second groove 22 are spaced apart and staggered, the V-shaped spring 2 and the O-ring 3 are coaxially arranged with the oil seal body 1, and a certain interference is designed between the inner diameter of the oil seal and the shaft. After the oil seal is installed on the shaft, the inner diameter will be expanded, and the opening of the V-shaped spring 2 will be further compressed. When the opening of the V-shaped spring 2 is compressed, an outward elastic force will be generated, and this elastic force becomes the preload force before the main lip 131 is activated. When the medium enters the spring groove 11 and the medium has pressure, the pressure acts on the main lip 131 and the main oil seal arm 13, so that the main lip 131 is pressed against the shaft. At this time, the main lip 131 is in an activated state.

[0033] Reference Figures 1 to 7 During the use of the HA spring combination oil seal of the utility model, the outside of the oil seal body 1 is sealed and contacted with the housing of the oil pump through its outer wall and the O-ring 3 to form a static seal, and the main lip 131 has a certain pre-tightening force. On the one hand, the main lip 131 is in primary sealing contact with the shaft of the oil pump, and on the other hand, the auxiliary lip 141 is in secondary sealing contact with the shaft of the oil pump, so that the main lip 131 and the auxiliary lip 141 are both in sealing contact with the shaft of the oil pump to form a dynamic seal. When the oil seal is installed, the V-shaped spring 2 can provide a certain pre-tightening force to open the main oil seal arm 13, and the V-shaped spring 2 can squeeze the main lip 131 to one side of the shaft, so that the main lip 131 is in contact with the shaft, thereby increasing the adhesion.

[0034] The design of the HA spring combination oil seal of the utility model fully considers the working characteristics of the aircraft oil pump, adopts an annular oil seal body 1 structure, and sets an annular spring groove 11 on its upper end face to accommodate the V-shaped spring 2. The existence of the V-shaped spring 2 can not only provide sufficient preload force to ensure the tight fit between the oil seal and the sealing surface, but also generate a reverse force when the oil seal is under pressure, further improving the sealing effect. At the same time, a circle of main oil seal arms 13 and a circle of boosting grooves 15 are set on the inner wall of the oil seal body 1, as well as a secondary oil seal arm 14 formed by the side wall of the boosting groove 15. This double oil seal structure design can effectively prevent medium leakage and improve sealing performance.

[0035] In summary, as a high-performance sealing device, the HA spring combination oil seal has a unique design and excellent performance, making it an ideal choice for aircraft oil pump sealing systems. With its unique design and excellent performance, it has been widely used in the aviation industry. With the continuous development of the aviation industry, the application prospects of the HA spring combination oil seal will be broader.

[0036] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of protection of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A HA type spring combination oil seal, comprising an annular oil seal body, characterized in that: An annular spring groove is provided on the upper end surface of the oil seal body and a circle of main oil seal arms are formed on the inner wall of the oil seal body, the main oil seal arm is provided with a main lip, a circle of V-shaped spring is clamped in the spring groove, a circle of boosting groove is provided on the inner wall of the oil seal body, the boosting groove is inclined and bent away from the side wall of the main oil seal arm toward the oil seal body to form a secondary oil seal arm, the secondary oil seal arm is provided with a secondary lip, and an O-ring is provided on the outer sleeve of the oil seal body.

2. The HA type spring combination oil seal according to claim 1, characterized in that: The root of the auxiliary oil seal arm is located on the lower end of the oil seal hole of the oil seal body.

3. The HA type spring combination oil seal according to claim 1, characterized in that: The pressure boosting groove is obliquely opened on the inner wall of the oil seal body to form an inclined surface.

4. The HA type spring combination oil seal according to claim 3, characterized in that: The diameter of the auxiliary lip is smaller than the root diameter of the auxiliary oil seal arm.

5. The HA type spring combination oil seal according to claim 3, characterized in that: The main oil seal arm is arranged to be inclined toward the oil seal body, and the inclined direction of the inclined surface is opposite to the inclined direction of the main oil seal arm.

6. The HA type spring combination oil seal according to claim 1, characterized in that: The inner wall of the main oil seal arm is provided with an arc-shaped protrusion to form a circle of the main lip, and the diameter of the main lip is greater than the diameter of the auxiliary lip.

7. The HA type spring combination oil seal according to claim 1, characterized in that: The auxiliary oil seal arm is integrally formed with the oil seal body, and the auxiliary oil seal arm is formed into an arc shape by heating a circle of straight arms and then bending them through a jig.

8. The HA type spring combination oil seal according to claim 1, characterized in that: The main oil seal arm is 0.1 mm-0.3 mm lower than the corresponding end surface of the oil seal body.

9. The HA type spring combination oil seal according to claim 1, characterized in that: A circle of grooves is arranged on the outer wall of the oil seal body, the O-ring is located in the groove, and the inner diameter of the O-ring is smaller than the bottom diameter of the groove.

10. The HA type spring combination oil seal according to claim 1, characterized in that: The spring groove is coaxially arranged with the oil seal body, and a retaining position is provided on the inner wall of the spring groove. The inner end and the outer end of the V-shaped spring are both bent upward to form a V shape and the ends of the two press against the retaining position. The inner end and the outer end of the V-shaped spring are provided with multiple grooves at intervals and staggered to form multiple spring sheets connected together.

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