Sealing device of aerospace motor

Abstract

The utility model relates to the technical field of aerospace motors, in particular to a sealing device of an aerospace motor. Comprising a movable ring, a static ring and an auxiliary sealing mechanism, the movable ring comprises a stainless steel ring and an O-shaped sealing ring, the static ring is composed of a graphite ring, a metal corrugated pipe assembly and a shell, the auxiliary sealing mechanism comprises a screwing piece, a pressing rod and a V-shaped sealing ring, and after the whole sealing device is used for a period of time, the screwing piece is rotated to drive the pressing rod to move in an abutting cavity; the pressing rod and the pressing block are matched to apply force to the V-shaped sealing ring, so that the V-shaped sealing ring is tightly attached to the O-shaped sealing ring after being unfolded, auxiliary sealing is conducted through the arrangement of the V-shaped sealing ring, when the O-shaped sealing ring is aged, auxiliary sealing can be conducted through the V-shaped sealing ring, and the phenomenon that the sealing effect is affected due to aging of the O-shaped sealing ring is avoided. And the sealing failure of the whole sealing device is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace motors, in particular to a sealing device for an aerospace motor. Background Art

[0002] Aerospace stepping motors are motors commonly used in the aerospace field. Due to different installation positions, the shaft extensions of some aerospace stepping motors will directly contact liquids (such as fuel, lubricating oil, and coolant). To prevent them from entering the motor interior and causing consequences such as damage to the motor bearings, sealing is required at the shaft extension of the motor. Currently, lip seals are mostly used for sealing, but during use, it is difficult to install the seal.

[0003] To solve the above problems, a sealing device for an aviation motor is disclosed in the patent document with the publication number CN218408509U. The sealing device is divided into two parts, a moving ring and a stationary ring. Compared with the lip seal, this technical solution is more convenient and simple to install; the circumferential contact friction between the lip of the lip seal and the shaft is changed to the planar contact friction between the end face of the moving ring and the graphite ring of the stationary ring, improving the sealing reliability; the elastic force of the metal bellows compensates for the pressure between the moving ring and the stationary ring, ensuring that the stationary ring and the moving ring are always in close contact, improving the sealing reliability and service life; there is no radial relative displacement between the inner ring of the moving ring and the motor shaft, reducing the requirements for the dimensional accuracy and surface roughness of the shaft. The above-mentioned sealing device for an aviation motor can be used for the sealing of an aerospace motor.

[0004] However, in the existing aerospace motors, only an O-ring is used for sealing on the moving ring. The aging of the O-ring poses a risk of seal failure. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a sealing device for an aerospace motor, aiming to solve the technical problem that only an O-ring is used for sealing on the moving ring in the existing aerospace motors, and the aging of the O-ring poses a risk of seal failure.

[0006] To achieve the above purpose, the utility model provides a sealing device for an aerospace motor, including a moving ring, a stationary ring, and an auxiliary sealing mechanism. The moving ring includes a stainless steel ring and an O-ring. The stationary ring is composed of a graphite ring, a metal bellows assembly, and a housing. The O-ring is installed in the groove of the stainless steel ring. The metal bellows assembly is arranged inside the housing. The graphite ring is arranged on the metal bellows assembly. The graphite ring is in contact with the end face of the stainless steel ring.

[0007] The auxiliary sealing mechanism includes a screwing member, a pressing rod and a V-shaped sealing ring. The V-shaped sealing ring is also arranged in the groove of the stainless steel ring. The V-shaped sealing ring overlaps the outside of the O-shaped sealing ring and is located on the side of the O-shaped sealing ring away from the graphite ring. A holding cavity is arranged on the side of the groove of the stainless steel ring away from the graphite ring. The screwing member is threadedly connected to one end of the stainless steel ring away from the graphite ring. The pressing rod is fixedly arranged on the screwing member. The pressing rod is located inside the holding cavity. A pressing block is arranged at one end of the pressing rod away from the screwing member. The pressing block is in contact with the end face of the V-shaped sealing ring.

[0008] Wherein, a first thread is arranged on the inner side wall of the screwing member, and a second thread is arranged on the outer side wall of the stainless steel ring. The first thread is adapted to the second thread.

[0009] Wherein, the screwing member includes a sleeve ring and a cover ring. The first thread is arranged on the inner side wall of the sleeve ring. The cover ring is fixedly arranged at the end of the sleeve ring. The pressing rod is arranged on the cover ring.

[0010] Wherein, the number of the holding cavities is two. The two holding cavities are respectively arranged on both sides of the stainless steel ring. The number of the pressing rods is two. The pressing rods are arranged on both sides of the cover ring. Each pressing rod is respectively located inside one of the holding cavities.

[0011] Wherein, the number of the V-shaped sealing rings is multiple. The multiple V-shaped sealing rings are overlapped and arranged inside the groove of the stainless steel ring.

[0012] Wherein, anti-slip lines are arranged on the outer side wall of the sleeve ring.

[0013] Wherein, the metal bellows assembly includes a metal bellows body and a graphite ring bushing. One end of the metal bellows body is connected to the outer shell. The other end of the metal bellows body is provided with the graphite ring bushing. The graphite ring is installed inside the graphite ring bushing.

[0014] Wherein, the height of the graphite ring is higher than the end face of the graphite ring bushing. The surface roughness Ra of the end face of the stainless steel ring in contact with the graphite ring is not greater than 0.8μm.

[0015] A sealing device for an aerospace motor of the present utility model includes a moving ring, a static ring and an auxiliary sealing mechanism. The moving ring includes a stainless steel ring and an O-ring. The static ring is composed of a graphite ring, a metal bellows assembly and a housing. The auxiliary sealing mechanism includes a screwing member, a pressing rod and a V-ring. After the whole sealing device is used for a period of time, rotate the screwing member to drive the pressing rod to move inside the abutment cavity. Through the cooperation of the pressing rod and the pressing block, force is applied to the V-ring, so that the V-ring is unfolded and closely attached to the O-ring. Through the setting of the V-ring, auxiliary sealing is carried out, so that when the O-ring ages, the V-ring can be used for auxiliary sealing to avoid the situation that the sealing of the whole sealing device fails due to the aging of the O-ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of the sealing device for an aerospace motor provided by the present utility model.

[0018] Figure 2 is a cross-sectional view of the internal structure of the sealing device for an aerospace motor provided by the present utility model.

[0019] Figure 3 is provided by the present utility model Figure 2 local enlarged view of part A.

[0020] Figure 4 is a schematic exploded view of the screwing member and the stainless steel ring provided by the present utility model.

[0021] 101 - stainless steel ring, 102 - O-ring, 103 - graphite ring, 104 - housing, 105 - pressing rod, 106 - V-ring, 107 - collar, 108 - cover ring, 109 - metal bellows body, 110 - graphite ring bushing, 111 - abutment cavity, 112 - pressing block, 113 - first thread, 114 - second thread, 115 - anti-slip pattern. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0023] Please refer to Figures 1 to 4 , where Figure 1 is a schematic structural view of a sealing device for a space motor, Figure 2 is a cross-sectional view of the internal structure of a sealing device for a space motor, Figure 3 is Figure 2 a partial enlarged view of the structure at point A of Figure 4 is a schematic exploded view of the screwing member and the stainless steel ring.

[0024] The present utility model provides a sealing device for a space motor: including a moving ring, a stationary ring and an auxiliary sealing mechanism. The moving ring includes a stainless steel ring 101 and an O-ring 102. The stationary ring is composed of a graphite ring 103, a metal bellows assembly and a housing 104. The auxiliary sealing mechanism includes a screwing member, a pressing rod 105 and a V-ring 106. The screwing member includes a collar 107 and a cover ring 108. The metal bellows assembly includes a metal bellows body 109 and a graphite ring bushing 110. By the foregoing solution, the problem that only the O-ring 102 is used for sealing on the moving ring in the existing space and aviation motors, and the aging of the O-ring 102 poses a risk of sealing failure is solved. It can be understood that the foregoing solution can be used in the structure of the sealing device for space and aviation motors.

[0025] For this specific embodiment, the O-ring 102 is installed in the groove of the stainless steel ring 101. The metal bellows assembly is arranged inside the housing 104. The graphite ring 103 is arranged on the metal bellows assembly. The graphite ring 103 is in contact with the end face of the stainless steel ring 101. One end of the metal bellows body 109 is connected to the housing 104. The other end of the metal bellows body 109 is provided with the graphite ring bushing 110. The graphite ring 103 is installed inside the graphite ring bushing 110. The height of the graphite ring 103 is higher than the end face of the graphite ring bushing 110. The surface roughness Ra of the end face of the stainless steel ring 101 in contact with the graphite ring 103 is not greater than 0.8 μm. The circumferential contact friction between the lip of the lip seal and the shaft in the prior art is changed to the planar contact friction between the end face of the moving ring and the graphite ring 103 in the stationary ring, improving the sealing reliability. And the elastic force of the metal bellows body 109 compensates the pressure between the moving ring and the stationary ring, ensuring that the stationary ring and the moving ring are always in close contact, improving the sealing reliability and service life.

[0026] Among them, a V-shaped sealing ring 106 is further arranged in the groove of the stainless steel ring 101. The V-shaped sealing ring 106 overlaps the outside of the O-shaped sealing ring 102 and is located on the side of the O-shaped sealing ring 102 away from the graphite ring 103. A holding cavity 111 is arranged on the side of the groove of the stainless steel ring 101 away from the graphite ring 103. A screwing member is threadedly connected to one end of the stainless steel ring 101 away from the graphite ring 103. A pressing rod 105 is fixedly arranged on the screwing member. The pressing rod 105 is located inside the holding cavity 111. A pressing block 112 is arranged at one end of the pressing rod 105 away from the screwing member. The pressing block 112 is in contact with the end face of the V-shaped sealing ring 106. When the entire sealing device is used for a period of time, rotate the screwing member to drive the pressing rod 105 to move inside the holding cavity 111. Through the cooperation of the pressing rod 105 and the pressing block 112, force is applied to the V-shaped sealing ring 106, so that the V-shaped sealing ring 106 is unfolded and closely attached to the O-shaped sealing ring 102. Through the setting of the V-shaped sealing ring 106, auxiliary sealing is carried out, so that when the O-shaped sealing ring 102 ages, the V-shaped sealing ring 106 can be used for auxiliary sealing, avoiding the situation that the sealing of the entire sealing device fails due to the aging of the O-shaped sealing ring 102.

[0027] Secondly, a first thread 113 is arranged on the inner side wall of the screwing member, and a second thread 114 is arranged on the outer side wall of the stainless steel ring 101. The first thread 113 is adapted to the second thread 114. Through the setting of the first thread 113 and the second thread 114, the screwing member is threadedly connected to the stainless steel ring 101.

[0028] At the same time, the first thread 113 is arranged on the inner side wall of the collar 107. A cover ring 108 is fixedly arranged at the end of the collar 107. The pressing rod 105 is arranged on the cover ring 108. Since the cover ring 108 is fixedly connected to the collar 107 and is made by an integral molding technique when preparing the screwing member, the structure is more firm. An anti-slip pattern 115 is arranged on the outer side wall of the collar 107. Through the setting of the anti-slip pattern 115, it is more convenient to operate when screwing the screwing member.

[0029] In addition, the number of the abutting cavities 111 is two, and the two abutting cavities 111 are respectively arranged on both sides of the stainless steel ring 101. The number of the pressing rods 105 is two, and the pressing rods 105 are arranged on both sides of the cover ring 108. Each pressing rod 105 is respectively located inside one of the abutting cavities 111. Since the number of both the abutting cavities 111 and the pressing rods 105 is multiple, when applying force to the V-shaped sealing ring 106, the force application is more uniform.

[0030] Moreover, the number of the V-shaped sealing rings 106 is multiple, and the multiple V-shaped sealing rings 106 are overlapped and arranged inside the groove of the stainless steel ring 101. Since the number of the V-shaped sealing rings 106 is multiple, the service life of the moving ring is further prolonged.

[0031] When using the sealing device of an aerospace motor of the present utility model, the circumferential contact friction between the lip of the lip seal in the prior art and the shaft is changed to the planar contact friction between the end face of the moving ring and the plane of the graphite ring 103 in the static ring, improving the sealing reliability. And the elastic force of the metal bellows body 109 compensates the pressure between the moving ring and the static ring, ensuring that the static ring and the moving ring are always in close fit, improving the sealing reliability and service life. And when the whole sealing device has been used for a period of time, rotate the screwing member to drive the pressing rod 105 to move inside the abutting cavity 111. Through the cooperation of the pressing rod 105 and the pressing block 112, force is applied to the V-shaped sealing ring 106, so that after the V-shaped sealing ring 106 is unfolded, it is in close fit with the O-shaped sealing ring 102. Through the arrangement of the V-shaped sealing ring 106, auxiliary sealing is carried out, so that when the O-shaped sealing ring 102 ages, the V-shaped sealing ring 106 can be used for auxiliary sealing to avoid the situation that the sealing of the whole sealing device fails due to the aging of the O-shaped sealing ring 102. And since the number of the V-shaped sealing rings 106 is multiple, the service life of the moving ring is further prolonged.

[0032] What is disclosed above is only a preferred embodiment of the present utility model. Certainly, the scope of the rights of the present utility model cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the utility model.

Claims

1. A sealing device for a space motor, comprising a moving ring and a stationary ring. The moving ring includes a stainless steel ring and an O-ring. The stationary ring is composed of a graphite ring, a metal bellows assembly, and a housing. The O-ring is installed in a groove of the stainless steel ring. The metal bellows assembly is arranged inside the housing. The graphite ring is arranged on the metal bellows assembly. The graphite ring is in contact with the end face of the stainless steel ring. It is characterized in that, it further includes an auxiliary sealing mechanism; The auxiliary sealing mechanism includes a screwing member, a pressing rod, and a V-ring. The V-ring is also arranged in the groove of the stainless steel ring. The V-ring overlaps outside the O-ring and is located on the side of the O-ring away from the graphite ring. A holding cavity is arranged on the side of the groove of the stainless steel ring away from the graphite ring. The screwing member is threadedly connected to the end of the stainless steel ring away from the graphite ring. The pressing rod is fixedly arranged on the screwing member. The pressing rod is located inside the holding cavity. A pressing block is arranged at the end of the pressing rod away from the screwing member. The pressing block is in contact with the end face of the V-ring.

2. The sealing device for a space motor according to claim 1, characterized in that, a first thread is arranged on the inner side wall of the screwing member, and a second thread is arranged on the outer side wall of the stainless steel ring. The first thread is adapted to the second thread.

3. The sealing device for a space motor according to claim 2, characterized in that, the screwing member includes a sleeve ring and a cover ring. The first thread is arranged on the inner side wall of the sleeve ring. The cover ring is fixedly arranged at the end of the sleeve ring. The pressing rod is arranged on the cover ring.

4. The sealing device for a space motor according to claim 3, characterized in that, the number of the holding cavities is two. The two holding cavities are respectively arranged on both sides of the stainless steel ring. The number of the pressing rods is two. The pressing rods are arranged on both sides of the cover ring. Each pressing rod is respectively located inside one of the holding cavities.

5. The sealing device for a space motor according to claim 4, characterized in that, the number of the V-rings is multiple. The multiple V-rings are overlapped and arranged inside the groove of the stainless steel ring.

6. The sealing device for a space motor according to claim 5, characterized in that, anti-slip patterns are arranged on the outer side wall of the sleeve ring.

7. The sealing device for a space motor according to claim 1, characterized in that, the metal bellows assembly includes a metal bellows body and a graphite ring bushing. One end of the metal bellows body is connected to the housing. The other end of the metal bellows body is provided with the graphite ring bushing. The graphite ring is installed inside the graphite ring bushing.

8. The sealing device for a space motor according to claim 7, characterized in that, the height of the graphite ring is higher than the end face of the graphite ring bushing. The surface roughness Ra of the end face of the stainless steel ring in contact with the graphite ring is not greater than 0.8 μm.

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