A rotary elasto-plastic sealing device for sealing the transfer of stellar soil samples

Abstract

The present invention discloses a rotary elastoplastic sealing device for sealing the transfer of star soil samples, which relates to the field of sealing technology and solves the problems of low temperature adaptability, low reusability and unstable performance of existing sealing components. The present invention includes a sealing shell, a channel sealing bracket and a plurality of sealing rings. The channel sealing bracket is a cylindrical structure and is rotatably installed inside the sealing shell; a sample channel is provided inside the channel sealing bracket; a plurality of sealing rings are evenly distributed on the curved surface of the channel sealing bracket, wherein two sealing rings are provided at both ends of the sample channel; the sealing ring includes a sealing lip and a spring, and the spring is provided inside the sealing lip; an inlet is provided at the upper end of the sealing shell, and an outlet is provided at the lower end. The present invention seals the inlet and outlet by a sealing ring composed of a sealing lip and an O-type spring, thereby compensating for the wear and deformation defects of pure polytetrafluoroethylene itself and improving the reusability of the sealing device and the stability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and in particular to a rotary elastic-plastic sealing device for sealing the transfer of star soil samples. Background Art

[0002] Sealing technology for extraterrestrial soil samples during sample return missions has long been a topic of considerable interest to researchers. The performance of these seals directly impacts the accuracy and authenticity of ground-based data analysis. Currently, the main sealing solutions used in sample return missions include rubber ring seals, metal knife-edge seals, and a redundant combination of the two, each of which offers excellent sealing performance in its respective operating environments.

[0003] The difference between the in-situ extraction and analysis mission and the sample return mission is that the space soil samples do not need to be brought back to the ground, but can be extracted and analyzed directly in orbit. This analysis mission is mainly used to extract helium from the volatile components of the space soil and seal it. The long life of the in-situ extraction and analysis mission requires the seals to have good wear resistance and reusability. Rubber seals have poor temperature resistance and produce impurity volatile gases at high temperatures, while metal blades require high loads and are only for single use. Currently, there is a lack of such a sealing component with good temperature adaptability, stable performance, and good reusability. Summary of the Invention

[0004] To address the aforementioned issues of low temperature adaptability, reusability, and unstable performance of existing sealing assemblies, this invention proposes a rotary elasto-plastic sealing device for use in the transfer of space soil samples. This device seals the inlet and outlet ports using a sealing ring composed of a polytetrafluoroethylene sealing lip and an O-ring spring made of a nickel-based heat-resistant alloy. This seal compensates for the inherent wear and deformation of polytetrafluoroethylene, improving the sealing device's reusability and stability.

[0005] The present invention proposes a rotary elastoplastic sealing device for sealing the transfer of star soil samples, which specifically includes a sealing shell, a channel sealing bracket and several sealing rings. The channel sealing bracket is a cylindrical structure and is rotatably installed inside the sealing shell; a sample channel is arranged in the radial direction inside the channel sealing bracket; several sealing rings are evenly distributed on the curved surface of the channel sealing bracket, of which two sealing rings are arranged at both ends of the sample channel; the sealing ring includes a sealing lip and a spring, and the spring is arranged inside the sealing lip; an inlet is arranged at the upper end of the sealing shell, and a sample outlet is arranged at the lower end.

[0006] Furthermore, a driving port is provided on the right side of the sealing shell, and the driving device extends from the driving port into the driving channel to rotate the sealing bracket.

[0007] Furthermore, a plurality of driving teeth are evenly arranged on the curved surface of the channel sealing bracket, and the driving device drives the channel sealing bracket to rotate through the plurality of driving teeth.

[0008] Furthermore, a plurality of annular grooves are provided on the curved surface of the channel sealing bracket, and the sealing rings are installed in the annular grooves.

[0009] Furthermore, the diameter of the sealing ring is larger than the diameters of the sample inlet and the sample outlet.

[0010] Furthermore, an annular opening is provided on the inner ring of the sealing lip, so that the inside of the sealing ring is connected with the outside.

[0011] Furthermore, the contact position between the sealing lip and the inner wall of the sealing shell is a trapezoidal structure.

[0012] Furthermore, the sealing lip is made of polytetrafluoroethylene.

[0013] Furthermore, the spring is an O-shaped spring.

[0014] Furthermore, the spring material is nickel-based heat-resistant alloy.

[0015] The beneficial effects of the rotary elasto-plastic sealing device for sealing the transfer of star soil samples described in the present invention are:

[0016] (1) The rotary elasto-plastic sealing device for sealing the transfer of astronomical soil samples described in the present invention seals the sample inlet and sample outlet via a sealing ring composed of a sealing lip made of polytetrafluoroethylene and an O-type spring made of a nickel-based heat-resistant alloy. This overcomes the temperature resistance shortcomings of rubber ring sealing devices and the limited number of uses of metal knife-edge sealing devices, and has good environmental adaptability and sealing reusability.

[0017] (2) The rotary elastic-plastic sealing device for sealing the transfer of astronomical soil samples described in the present invention relies on the elastic-plastic matching of the built-in spring and the polytetrafluoroethylene sealing lip. The spring produces elastic deformation under a given load, thereby compensating for the wear and deformation defects of the simple polytetrafluoroethylene itself.

[0018] (3) The rotary elastoplastic sealing device for sealing the transfer of star soil samples described in the present invention has a sealing ring material with good environmental adaptability, and its built-in O-type spring can overcome the problem of slight eccentricity of the mating surface, improve the stress condition of the sealing ring, and enhance the reusability of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] In the attached figure:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a rotary elastic-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of a sealing ring and a channel sealing bracket of a rotary elastic-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0023] Figure 3 This is a front view of a rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of a rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0025] Figure 5 This is a top view of a rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0026] Figure 6 This is a cross-sectional view of a sealing ring of a rotary elastic-plastic sealing device for sealing the transfer of star soil samples according to the present invention;

[0027] Among them: 1-sealing housing, 2-sealing ring 1, 3-sealing ring 2, 4-sealing ring 3, 5-channel sealing bracket, 6-sealing ring 4, 7-sealing lip, 8-spring, 9-sample channel, 10-inlet, 11-outlet, 12-driving port, 13-driving tooth, 14-annular groove. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0029] Specific implementation method 1: See Figures 1-6The present embodiment is described in detail. The rotary elastic-plastic sealing device for sealing the transfer of star soil samples described in the present embodiment specifically includes a sealing shell 1, a channel sealing bracket 5 and a plurality of sealing rings. The channel sealing bracket 5 is a cylindrical structure, which is rotatably installed inside the sealing shell 1 with the central axis of the channel sealing bracket 5 as the rotation axis; a sample channel 9 is provided in the radial direction inside the channel sealing bracket 5; a plurality of sealing rings are evenly distributed on the curved surface of the channel sealing bracket 5, of which two sealing rings are provided at both ends of the sample channel 9; the sealing ring includes a sealing lip 7 and a spring 8, and the spring 8 is provided inside the sealing lip 7. The two are assembled by a slight interference fit to ensure that the contact surface is uniformly stressed during operation; there is an initial pre-tightening force between the sealing lip 7 and the channel sealing bracket 5 and the sealing shell 1, and an extrusion contact occurs and elastic-plastic deformation is generated to fill the microscopic unevenness of the contact surface. The internal spring 8 undergoes elastic deformation to provide a spring reaction force for the contact surface, thereby increasing the established sealing force load and improving the sealing effect;

[0030] The sealed shell 1 is provided with an inlet 10 at the upper end and an outlet 11 at the lower end, and the inlet 10 and the outlet 11 are coaxially arranged; during sampling, the sample channel 9 is connected with the inlet 10 and the outlet 11 up and down, and the star soil sample can enter from the inlet 10 of the sealing device, pass through the sample channel 9 and the outlet 11 into the subsequent star soil grinding device, or discharge the ground star soil sample; during sealing, by rotating the channel sealing bracket 5, the sample channel 9 is staggered with the inlet 10 and the outlet 11, and the sealing ring provided on the channel sealing bracket 5 is rotated to the position of the inlet 10 and the outlet 11 to seal the inlet 10 and the outlet 11.

[0031] A driving port 12 is provided on the right side of the sealing housing 1 , and a driving device extends from the driving port 12 to drive the channel sealing bracket 5 to rotate; the driving device is a valve-controlled actuator.

[0032] A plurality of driving teeth 13 are evenly arranged on the curved surface of the channel sealing bracket 5 . The driving device drives the channel sealing bracket 5 to rotate inside the sealing housing 1 through the plurality of driving teeth 13 , thereby achieving sample transfer and channel sealing.

[0033] The curved surface of the channel sealing bracket 5 is provided with a plurality of annular grooves 14 , and the sealing rings are installed in the annular grooves 14 .

[0034] The diameter of the sealing ring is larger than the diameters of the sample inlet 10 and the sample outlet 11 , thereby ensuring effective sealing of the sample inlet 10 and the sample outlet 11 .

[0035] An annular opening is provided on the inner ring of the sealing lip 7, so that the inside of the sealing ring is connected with the outside. When the star soil sample passes through the sealing device and enters the subsequent grinding device, the channel sealing bracket 5 rotates 90 degrees, and the sample channel 9 is staggered with the upper and lower sample inlets 10 and sample outlets 11. The sealing rings at other positions on the curved surface of the channel sealing bracket 5 seal the sample inlet 10 and the sample outlet 11. Since gas is generated during the grinding of star soil in the grinding device, a certain pressure is generated inside the grinding device, and the outside of the device is a vacuum environment. The generated gas enters the inside of the sealing ring from the grinding device through the annular opening on the inner ring of the sealing lip 7. This part of the gas causes a pressure difference between the inside and outside of the grinding device. The positive pressure environment promotes a tighter fit between the sealing lip 7 and the inner wall of the sealing shell 1, thereby enhancing the sealing effect.

[0036] The contact position between the sealing lip 7 and the inner wall of the sealing shell 1 is a trapezoidal structure. The initial contact width between the sealing lip 7 and the inner wall of the sealing shell 1 is small, and the sealing contact pressure is large. As the number of sealing repetitions increases, the sealing lip is worn due to friction with the sealing shell, the contact width gradually increases, and the sealing contact pressure decreases, thereby ensuring that the overall sealing performance remains stable.

[0037] The sealing lip 7 is made of polytetrafluoroethylene, which has good heat resistance and cold resistance, and is resistant to acids, alkalis, and various organic solvents.

[0038] The spring 8 is an O-shaped spring, specifically an O-shaped helical spring, made of a nickel-based heat-resistant alloy, preferably Inconel600.

[0039] The specific working process of the rotary elasto-plastic sealing device for sealing the transfer of star soil samples described in the present invention is as follows:

[0040] During the working process, two rotary elasto-plastic sealing devices are involved, the sample outlet 11 of one rotary elasto-plastic sealing device is connected to the sample inlet channel of the grinding device, and the sample discard channel at the other end of the grinding device is connected to another rotary elasto-plastic sealing device, and the three devices are connected in sequence from top to bottom; during the sampling process, the sample channel 9 inside the first rotary elasto-plastic sealing device at the upper end is connected to the sample inlet 10 and the sample outlet 11 up and down, and the star soil sample enters the grinding device through the rotary elasto-plastic sealing device at the upper end; at this time, the axis of the sample channel 9 inside the rotary elasto-plastic sealing device at the lower end is at a 90-degree angle to the axis of the sample inlet 10 and the sample outlet 11, and the sealing ring on the curved surface of its channel sealing bracket 5 seals the sample inlet 10; when the star soil sample has completely entered the grinding device, the channel sealing bracket 5 inside the rotary elasto-plastic sealing device at the upper end is powered The device rotates 90 degrees under the drive of the device, and its sample outlet 11 is sealed by the sealing ring. Under the action of the upper and lower rotary elasto-plastic sealing devices, a closed environment is formed inside the grinding device, and then the star soil sample is ground, releasing the helium carried by the star soil sample; the generated helium enters the sealing rings of the upper and lower rotary elasto-plastic sealing devices to form a positive pressure environment, which makes the sealing lip 7 and the inner wall of the sealing shell 1 fit more tightly, thereby enhancing the sealing effect; after the helium is extracted and analyzed through the pipeline of the grinding device, the channel sealing bracket 5 inside the rotary elasto-plastic sealing device at the lower end is driven by the power device to rotate 90 degrees, so that its sample channel 9 is connected with the upper and lower sample inlets 10 and the sample outlet 11 of the sealing device, and the star soil sample is discharged from the sample channel 9 to achieve sample disposal, thereby completing a complete sealing and helium preparation process.

[0041] To summarize the above implementation cases, the rotary elastoplastic sealing device for star soil sample transfer sealing described in the present invention seals the sample inlet 10 and the sample outlet 11 through a sealing ring composed of a sealing lip 7 made of polytetrafluoroethylene and an O-type spring 8 made of a nickel-based heat-resistant alloy, overcoming the temperature resistance defects of the rubber ring sealing device and the use number defects of the metal knife-edge sealing device, and has good environmental adaptability and sealing reusability; the rotary elastoplastic sealing device for star soil sample transfer sealing described in the present invention relies on the elastic-plastic matching of the built-in spring 8 and the polytetrafluoroethylene sealing lip 9, and the spring 8 produces elastic deformation under the action of a given force load, which makes up for the wear and deformation defects of the simple polytetrafluoroethylene itself; the rotary elastoplastic sealing device for star soil sample transfer sealing described in the present invention has good environmental adaptability of the sealing ring material, and its built-in O-type spring 8 can overcome the problem of slight eccentricity of the mating surface, improve the stress conditions of the sealing ring, and improve the reusability of the sealing ring.

[0042] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the invention. Reasonable combinations of the features described in the above embodiments are also possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A rotary elasto-plastic sealing device for sealing the transfer of stellar soil samples, characterized by: The invention comprises a sealing shell (1), a channel sealing bracket (5) and a plurality of sealing rings, wherein the channel sealing bracket (5) is a cylindrical structure and is rotatably mounted inside the sealing shell (1); a sample channel (9) is provided in the radial direction inside the channel sealing bracket (5); a plurality of sealing rings are evenly distributed on the curved surface of the channel sealing bracket (5), wherein two sealing rings are provided at both ends of the sample channel (9); the sealing ring comprises a sealing lip (7) and a spring (8), wherein the spring (8) is provided inside the sealing lip (7); a sample inlet (10) is provided at the upper end of the sealing shell (1), and a sample outlet (11) is provided at the lower end; The sealing housing (1) is provided with a driving port (12) on the right side, and the driving device extends from the driving port (12) into the driving channel sealing bracket (5) to rotate; A plurality of driving teeth (13) are evenly arranged on the curved surface of the channel sealing bracket (5), and the driving device drives the channel sealing bracket (5) to rotate via the plurality of driving teeth (13); A sample outlet (11) of a rotary elastic-plastic sealing device is connected to a sample inlet channel of the grinding device, and a sample discard channel at the other end of the grinding device is connected to another rotary elastic-plastic sealing device, and the three devices are connected in sequence from top to bottom; The inner ring of the sealing lip (7) is provided with an annular opening so that the inside of the sealing ring is connected with the outside. When the star soil sample passes through the sealing device and enters the subsequent grinding device, the channel sealing bracket (5) rotates, and the sample channel (9) is staggered with the upper and lower sample inlets (10) and sample outlets (11). The sealing rings at other positions on the curved surface of the channel sealing bracket (5) seal the sample inlet (10) and sample outlet (11). Since gas is generated during the grinding of the star soil in the grinding device, a certain pressure is generated inside the grinding device, while the outside of the device is a vacuum environment. The generated gas enters the inside of the sealing ring from the grinding device through the annular opening on the inner ring of the sealing lip (7). This part of the gas causes a pressure difference between the inside and outside of the grinding device. Under the positive pressure environment, the sealing lip (7) and the inner wall of the sealing shell (1) are more tightly fitted, thereby enhancing the sealing effect.

2. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 1, characterized in that: A plurality of annular grooves (14) are provided on the curved surface of the channel sealing bracket (5), and the sealing rings are installed in the annular grooves (14).

3. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 1 or 2, characterized in that: The diameter of the sealing ring is larger than the diameters of the sample inlet (10) and the sample outlet (11).

4. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 1, characterized in that: The contact position between the sealing lip (7) and the inner wall of the sealing housing (1) is a trapezoidal structure.

5. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 1 or 4, characterized in that: The sealing lip (7) is made of polytetrafluoroethylene.

6. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 1, 2 or 4, characterized in that: The spring (8) is an O-shaped spring.

7. The rotary elasto-plastic sealing device for sealing the transfer of star soil samples according to claim 6, characterized in that: The material of the spring (8) is nickel-based heat-resistant alloy.

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