Floating double sealing device and method for spatial sampling

Abstract

The present invention discloses a floating double sealing device and method for space sampling, which belongs to the field of spacecraft sampling return. The device realizes the sequential sealing function of the sample tank and the hatch through a floating connection assembly. The device includes a first sealing ring, a second sealing ring and a floating connection assembly. The tank body and the hatch frame are connected by a fixed guide rail. The two ends of the floating connection assembly are respectively fixedly connected to the tank cover and the door body. The first sealing ring is installed on the end face of the tank cover, and the second sealing ring is installed on the sealing end face of the hatch frame. The floating connection assembly has a force-controlled unlocking function. At the same time, there is a resistance spring between the inner and outer sleeves of the floating connection assembly to provide sufficient compression stroke. After the first end face seal is completed, when pressure continues to be applied, due to the force-controlled unlocking function of the floating connection assembly, the second end face seal will not accumulate the resistance of the first end face seal, thereby reducing the sealing resistance and thus reducing the packaging driving force.

Description

Technical Field

[0001] The present invention relates to a sealing device and method, in particular to a floating double sealing device and method for space sampling, belonging to the technical field of sampling return of spacecraft. Background Art

[0002] At present, all spacecraft that have achieved the sample return mission adopt a graded sealing mode, that is, the gas sealing packaging of the sample can and the thermal sealing of the return capsule are carried out separately. This working mode often requires the design of a more complex mechanical structure, such as using a robotic arm to package the sample can or using a multi-degree-of-freedom automatic packaging method. However, multi-degree-of-freedom automatic packaging involves more complex circuits and program design, which brings greater risks to the packaging work and will also lead to increased R&D and launch costs.

[0003] The sample container of Japan's Hayabusa 1 sampling and return probe series is cylindrical and uses double O-rings to achieve single-end sealing of the sample container. The sample container is sealed with the container cover and the cylinder through a locking mechanism and a compression spring. China's Chang'e 5 lunar sampling and return mission designed a redundant sealing structure with silver-indium alloy as the main end seal and O-ring radial auxiliary seal for automatic packaging of lunar samples. After the samples are collected, the motor drives the container cover to unlock. After the samples are loaded into the container, the pyrotechnic mechanism drives the cover to move downward to seal the container. The automatic unlocking and pyrotechnic sealing functions lead to the complexity of the packaging mechanism. The container air seal of Hayabusa 1 and Chang'e 5 and the thermal seal of the return capsule hatch are both graded.

[0004] The double end face seal design can integrate the air seal of the sample tank and the heat seal of the return capsule hatch, simplifying the requirements for the packaging mechanism, while reducing the demand for system resources and improving the reliability of the entire structure. However, the double end face seal connection usually uses a straight line connection to connect the two end faces, which will cause the accumulation of force on the air seal of the sample tank when the driving force is applied, causing the seal to withstand the force of large loads for a long time and shortening its service life. In addition, both ends of the double end face seal need to be precisely positioned to achieve good sealing performance. The traditional double end face connection method cannot meet the packaging work requirements of spacecraft sampling and return.

[0005] In summary, it is very necessary to design a sealing device that can achieve double end face sealing, solve the problem of increased driving force, and improve the service life of the sealing component. Summary of the invention

[0006] In view of this, the present invention provides a floating double sealing device for space sampling, which is used for the integrated sealing of the sample tank and the return capsule. Its floating connection assembly adopts a connection method in which a ball spring provides a pre-locking force, which effectively solves the problem of accumulation of driving force on the sealing end face of the sample tank and affecting the service life of the seal.

[0007] The floating double sealing device for space sampling comprises: a floating connection assembly, a first sealing ring and a second sealing ring; the objects to be sealed are the sample tank and the hatch;

[0008] A first sealing ring is provided on the axial end surface of the sample tank cover facing the tank body;

[0009] A second sealing ring is provided on the end surface of the door frame of the door facing one end of the door body;

[0010] The tank body and the door frame are fixed on the cabin body, and the tank cover and the door body are fixed outside the cabin;

[0011] The tank cover is connected to the door body through a floating connection assembly; the floating connection assembly includes: an inner sleeve, a ball, a ball spring, a resistance spring, an outer sleeve and a threaded adjustment column;

[0012] The sealing tank connector installed on the tank cover is fixedly connected to the pressing block, one end of the inner sleeve is fixedly connected to the pressing block, and the other end is connected to the hatch connector installed on the door body through a resistance spring;

[0013] The inner sleeve has more than one radial spring groove distributed along the circumferential direction on the circumferential surface thereof, and a stepped threaded hole is provided at the center of the inner sleeve, including an internal threaded section with a larger diameter and a light hole section with a smaller diameter; the threaded adjustment column has an external threaded section matching the internal threaded section of the stepped threaded hole and a tapered section corresponding to the spring groove; a ball spring is coaxially placed in each spring groove, and a ball is provided at each axial end of the ball spring, wherein the ball at one end contacts the outer circumferential surface of the tapered section of the threaded adjustment column at the corresponding position;

[0014] The outer sleeve is coaxially sleeved on the outside of the inner sleeve, and an annular groove is provided on the inner circumferential surface of the outer sleeve at a position corresponding to the spring groove as a ball raceway; the ball at the other end of the ball spring is located in the ball raceway; the end faces of the ball raceway at both ends of the axial direction are inclined surfaces inclined outward; the ball spring and the resistance spring are both in a compressed state to provide a pre-locking force;

[0015] One axial end of the outer sleeve is fixedly connected to the door connector, and the outer sleeve can slide axially relative to the inner sleeve to compress the resistance spring.

[0016] As a preferred embodiment of the present invention: two or more spring groove groups are arranged at intervals along the axial direction on the circumferential surface of the inner sleeve, and each spring groove group includes two or more spring grooves evenly spaced along the circumferential direction;

[0017] The threaded adjustment column has the same number of tapered sections as the spring slot groups, and each tapered section corresponds to the position of a spring slot group.

[0018] As a preferred embodiment of the present invention: the tank body is provided with a sealed tank lock for self-locking after the tank cover and the tank body are sealed in place; the hatch frame is provided with a hatch lock for self-locking after the door body and the hatch frame are sealed in place.

[0019] As a preferred embodiment of the present invention: a conical clamping boss is provided on the outer sleeve and the clamping block, which is used to cooperate with the clamping device in the return capsule to axially limit the floating connection assembly.

[0020] As a preferred embodiment of the present invention: a shoulder is provided on the outer circumferential surface of one end of the inner sleeve connected to the pressing block, and a sleeve end cover is mounted on the shoulder; the outer sleeve is fixedly connected to the sleeve end cover;

[0021] When the hatch is pushed to make the outer sleeve slide relative to the inner sleeve, the sleeve end cover is pushed by the outer sleeve to move toward the pressing block until it contacts the pressing block.

[0022] As a preferred embodiment of the present invention, a guide column is provided on the inner sleeve, which cooperates with a guide groove on the sleeve end cover to guide the outer sleeve during axial movement.

[0023] As a preferred embodiment of the present invention: the sample tank body is located inside the cabin body, and its open end is fixedly connected to the cabin door frame through a guide rail; a guide rod for cooperating with the guide rail is provided on the tank cover for axial movement to achieve guidance during the sealing process.

[0024] As a preferred embodiment of the present invention: In addition, a hollow weight-reducing hole is provided on the inner sleeve, and a rib plate is provided at the bottom of the inner sleeve.

[0025] As a preferred embodiment of the present invention, the thread of the internal thread section of the central stepped threaded hole of the inner sleeve is a fine pitch thread.

[0026] In addition, the present invention also provides a floating double sealing method for spatial sampling, based on the above floating double sealing device;

[0027] Step 1: Adjust the screwing depth of the threaded adjustment column to adjust the pre-locking force generated by the compression of the ball spring;

[0028] Step 2: Apply a horizontal thrust to the door body. Due to the pre-locking force generated by the compression of the ball spring and the resistance spring, the floating connection assembly is not compressed at this time; the tank cover, the floating connection assembly and the door body move forward as a whole until the first sealing ring is pressed onto the sealing end face of the tank body, thereby completing the first end face sealing;

[0029] Step 3: Continue to increase the horizontal thrust, and when the pre-locking force generated by the ball spring is overcome, the ball in the outer sleeve ball raceway is pressed into the spring groove; when the pre-locking force generated by the compression of the resistance spring is further overcome, the resistance spring begins to compress, causing the outer sleeve to move forward relative to the inner sleeve, and driving the door body forward through the door connector; until the second sealing ring on the end face of the door frame is pressed onto the sealing end face of the door body, thereby completing the second end face seal.

[0030] Beneficial effects:

[0031] (1) The present invention has a simple structure, is safe and reliable, and can achieve double end face sealing: The present invention adopts an integrated connection method of the sample tank seal and the hatch, avoiding complex circuit system design, simplifying the structure, improving the reliability of the device, reducing the R&D and launch costs, and achieving double end face sealing functions. At the same time, the double end face sealing design is adopted, and the sealing performance of the end face sealing is optimal for the driving force provided by the axial motion driving mechanism; due to the force-controlled unlocking function of the floating connection device, the precise stroke control requirements required by the double end face sealing design are met.

[0032] (2) The present invention reduces the driving force and increases the service life of the seal: Compared with other double-end connection mechanisms, the present invention adopts a method of controlling the axial displacement by a pre-locking force generated by the compression of a radial spring (i.e., a ball spring). After the first sealing of the sample tank is completed when the driving force is less than or equal to the pre-locking force, the floating connection assembly starts to drive the door compression stroke when the driving force continues to be applied. This process does not accumulate driving force on the end face of the sample tank, thereby increasing the service life of the seal.

[0033] (3) The present invention has an adjustable pre-locking force: the pre-locking force of the present invention is controlled by the elastic force generated by the compression of the ball spring. By adjusting the screw-in depth of the threaded adjustment column, the conical diameter of the threaded adjustment column becomes larger, the compression amount of the ball spring increases, and the generated pre-locking force increases.

[0034] (4) A conical clamping boss is provided on the outer sleeve and the clamping block of the floating connection assembly. During the launch and ascent of the probe, the clamping boss can cooperate with the clamping device in the return capsule to fix the entire floating connection assembly to prevent impact vibration from causing damage to the entire device.

[0035] (5) The ball raceway has a conical slope, which can minimize the driving force while ensuring the sealing performance.

[0036] (6) The tank body is provided with a sealed tank lock, and the hatch frame is provided with a hatch lock, which can realize the self-locking function after being sealed in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the double end face sealing device of the present invention before sealing;

[0039] Figure 2 This is an exploded view of the floating connection component;

[0040] Figure 3 The cross-sectional view (left) and schematic view (right) of the inner sleeve;

[0041] Figure 4 The figure is a cross-sectional view (right) and a schematic view (left) of the outer sleeve;

[0042] Figure 5 is a cross-sectional view of the initial position of the floating connection component;

[0043] Figure 6 A cross-sectional view of the floating connection assembly compressed into position;

[0044] Figure 7 Schematic diagram comparing the rear push stroke and required driving force of the double end face sealing device of the present invention (left) and the push stroke and required driving force of the traditional sealing device (right).

[0045] Wherein: 1-tank body, 2-guide rail, 3-door eccentric lock, 4-guide rod, 5-tank cover, 6-door body, 7-floating connection assembly, 8-door frame, 9-sealed tank eccentric lock, 10-sealed tank connector, 11-inner sleeve, 12-ball, 13-ball spring, 14-resistance spring, 15-door connector, 16-outer sleeve, 17-sleeve end cover (11 axial limit), 18-threaded adjustment column, 19-pressing block, 20-guide column, 21-step threaded hole, 22-spring groove, 23-rib plate, 24-pressing boss, 25-ball raceway, D1 is the first sealing end face, D2 is the second sealing end face, O1 is the first sealing ring, and O2 is the second sealing ring. DETAILED DESCRIPTION

[0046] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0047] The present embodiment is used to explain the present invention, but is not limited to the present invention. In order to make the public have a better understanding of the present invention, the following description is some specific details.

[0048] Embodiment 1:

[0049] This embodiment provides a floating double sealing device for space sampling, which can not only realize double end face sealing, but also reduce the driving force and increase the service life of the sealing component.

[0050] The floating double sealing device for space sampling is used to realize the sealing of the sample tank and the sealing of the return capsule door in sequence, thereby realizing double end face sealing.

[0051] like Figure 1 As shown, the floating double sealing device comprises: a guide rail 2, a hatch eccentric lock 3, a guide rod 4, a floating connection assembly 7, a sealing tank eccentric lock 9, a first sealing ring O1 and a second sealing ring O2. The objects to be sealed are the sample tank and the hatch.

[0052] The hatch door includes a door body 6 and a door frame 8; a second sealing ring O2 is provided on the end face of the door frame 8 facing the door body 6, and the end face of the door body 6 facing the door frame 8 is a second sealing end face D2. The sealing of the hatch door is achieved by pressing the two sealing rings O2 and the second sealing end face D2.

[0053] The sample tank comprises a tank body 1 and a tank cover 5, wherein the tank cover 5 is installed on the open end of the tank body 1, and the tank cover 5 is installed in an embedded manner and installed on the open end of the tank body 1, and is used to seal the open end of the tank body 1; specifically: the open end of the tank body 1 has an annular cavity with a larger diameter for accommodating the tank cover 5, so that the inner circumferential surface of the tank body 1 has an annular step surface at the connection with the annular cavity, and the annular step surface is the first sealing end surface D1; a first sealing ring O1 is provided on the axial end surface of the tank cover 5 facing the end of the tank body 1, and the tank cover 5 is sealed to the tank body 1 by pressing the first sealing ring O1 and the first sealing end surface D1.

[0054] In this solution, the end face sealing of the above two sealing end faces is achieved through a floating double sealing device.

[0055] like Figure 1 As shown, the tank body 1 and the hatch frame 8 are fixed on the cabin body, wherein the tank body 1 is located inside the cabin body, and its open end is fixedly connected to the hatch frame 8 through a guide rail 2; two relatively arranged sealed tank eccentric locks 9 are provided on the tank body 1, which are used to realize the self-locking function after the tank cover 5 and the tank body 1 are sealed in place; four hatch eccentric locks 3 are evenly distributed along the circumferential direction on the hatch frame 8, which are used to realize the self-locking function after the door body 6 and the hatch frame 8 are sealed in place.

[0056] The tank cover 5 and the door body 6 are fixed outside the cabin. Before the sampling is completed, the tank body 1 and the door frame 8 are both in an open state. The tank cover 5 is fixedly connected to the door body 6 through the floating connection assembly 7; the tank cover 5 and the door body 6 are integrated together through the floating connection assembly 7, which can realize the double end face sealing integration of the sample tank and the door of the detector return cabin, simplifying the requirements for the packaging mechanism, reducing the demand for system resources, and improving the reliability and stability of the seal. The tank cover 5 is provided with a guide rod 4 for cooperating with the guide rail 2, which is used to move along the axial direction to achieve guidance during the sealing process.

[0057] like Figure 2 As shown, the floating connection assembly 7 includes: a tank cover connector 10, an inner sleeve 11, a ball 12, a ball spring 13, a resistance spring 14, a hatch connector 15, an outer sleeve 16, a sleeve end cover 17, a threaded adjustment column 18 and a clamping block 19.

[0058] The sealing tank connector 10 is installed on the tank cover 5, and the sealing tank connector 10 is fixedly connected to the clamping block 19 by bolts. The single-ear plate connection method is adopted between the sealing tank connector 10 and the clamping block 19 to avoid the problem of unstable connection caused by the clearance fit of the double-ear plate connection. One end of the inner sleeve 11 is fixedly connected to the clamping block 19, and the other end is connected to the hatch connector 15 through the resistance spring 14 (that is, one end of the resistance spring 14 is in contact with the end face of the inner sleeve 11, and the other end is in contact with the end face of the hatch connector 15); the hatch connector 15 is installed on the door body 6. In this example, in order to prevent the inner sleeve 11 from rotating, the connection surface between it and the clamping block 19 is set to a square surface (that is, the cross-section of the end of the inner sleeve 11 connected to the clamping block 19 is square).

[0059] like Figure 3As shown, two spring slot groups are arranged axially on the circumferential surface of the inner sleeve 11, each spring slot group includes a plurality of spring slots 22 evenly spaced along the circumferential direction, and in this example, each spring slot group includes three spring slots 22 evenly spaced along the circumferential direction (i.e., the three spring slots are evenly distributed at 120° along the circumferential direction, and the three spring slots in each spring slot group correspond to each other). A stepped threaded hole 21 is arranged at the center of the inner sleeve 11, including an internal thread section with a larger diameter and a light hole section with a smaller diameter, wherein the thread of the internal thread section is set as a fine pitch thread, so as to accurately adjust the pre-tightening force of the device. The thread adjustment column 18 is a stepped thread column, which is designed into three sections. The first section is an external thread section, which cooperates with the internal thread section of the stepped thread hole 21 to fix and adjust the screw-in depth of the thread adjustment column 18; the second section and the third section are two identical tapered sections; the two tapered sections correspond to the positions of the two spring slot groups respectively, and a ball spring 13 is coaxially placed in each spring slot 22 of the two spring slot groups, and a ball 12 is respectively arranged at the axial ends of the ball spring 13, and the ball 12 at one end is located inside the inner sleeve 11. It contacts the outer circumferential surface of the tapered section of the threaded adjustment column 18 at the corresponding position; the ball spring 13 provides a pre-locking force for the entire device. The compression amount of the spring can be changed by adjusting the screw-in depth of the threaded adjustment column 18 in the stepped threaded hole 21 and changing the diameter of the tapered section of the threaded adjustment column 18 in contact with the ball 12, thereby providing pre-locking forces of different sizes. The thread is set to a fine pitch thread to accurately adjust the driving force required for the sealing process, and the axial displacement can be controlled by the pre-locking force generated by the compression of the ball spring.

[0060] In addition, the inner sleeve 11 is provided with three groups of hollow weight-reducing holes to meet the design requirements of light-weight spacecraft. At the same time, three ribs (23) are provided at the bottom of the inner sleeve 11 to ensure the rigidity of the mechanism while reducing the weight.

[0061] like Figure 4 As shown, the outer sleeve 16 is coaxially sleeved on the outside of the inner sleeve 11, and annular grooves are provided on the inner circumferential surface of the outer sleeve 16 at positions corresponding to the two spring groove groups as ball raceways 25; the ball 12 at the other end of the ball spring 13 is located in the ball raceway 25 on the inner circumferential surface of the outer sleeve 16; thus, the ball spring 13 cooperates with the two balls 12, one of the two balls 12 contacts the tapered section of the threaded adjustment column 18, and the other contacts the ball raceway 25 of the outer sleeve 16. A total of six ball springs 13 are used to reduce the external driving force required for sealing. The cone slope of the ball raceway 25 and the ball 12 when installed is 60° (that is, the end faces of the axial ends of the annular groove used to form the ball raceway 25 are inclined surfaces inclined outward, and the angle between the inclined surface and the axial direction of the outer sleeve 16 is 60°, as shown in FIG. Figure 4As shown, the transverse cross section of the ball track 25 is an isosceles trapezoid, which can minimize the driving force while ensuring the sealing performance; the slope of the ball track 25 can be designed according to actual use requirements. Initially, the ball spring 13 and the resistance spring 14 are both in a compressed state to provide a pre-locking force.

[0062] A shoulder is provided on the outer circumferential surface of one end of the inner sleeve 11 connected to the pressing block 19, and a sleeve end cover 17 is mounted on the shoulder; one axial end of the outer sleeve 16 is fixedly connected to the hatch connector 15, and the other end is fixedly connected to the sleeve end cover 17 through an annular boss provided on the outer circumferential surface. When the hatch 6 is pushed to make the outer sleeve 16 slide relative to the inner sleeve 11, the sleeve end cover 17 is pushed toward the pressing block 19 by the outer sleeve 16 until it contacts the pressing block 19, that is, the distance that the outer sleeve 16 moves axially relative to the inner sleeve 11 is the length of the shoulder on the outer circumferential surface of the inner sleeve 11 for installing the sleeve end cover 17. A guide column 20 is provided on the shoulder of the inner sleeve 11, which cooperates with the guide groove on the sleeve end cover 17 to prevent the outer sleeve 16 from rotating during the linear motion.

[0063] Conical clamping bosses 24 are provided on the outer sleeve 16 and the clamping block 19. During the launch and ascending movement of the detector, the clamping bosses 24 cooperate with the clamping device in the return capsule to fix the entire floating connection assembly (that is, during the launch and ascending movement of the detector, the axial ends of the resistance spring 14 are limited by limiting the clamping bosses 24, thereby avoiding relative movement of the components at the axial ends of the resistance spring 14 and compressing the resistance spring 14 during the above process) to prevent impact vibration from damaging the entire device.

[0064] This solution adopts a double end face sealing design for the sample tank and the hatch. The end face sealing has the best sealing performance for the driving force provided by the axial motion drive mechanism. At the same time, due to the force-controlled unlocking function of the floating connection device, it can meet the precise stroke control requirements required by the double end face sealing design.

[0065] Embodiment 2:

[0066] Based on the above embodiment 1, this embodiment provides a floating double-seal connection method based on double-end face sealing, comprising the following steps:

[0067] Step 1: First, coaxially sleeve the sleeve end cover 17 onto the shoulder of the inner sleeve 11, screw the threaded adjustment column 18 into the stepped threaded hole 21 of the inner sleeve 11, so that the two tapered sections of the threaded adjustment column 18 correspond to the positions of the two spring groove groups respectively, and install the first ball 12, the ball spring 13 and the second ball 12 in each spring groove 22 in sequence; install the resistance spring 14, press the inner sleeve 11 into the outer sleeve 16, and then fix the sleeve end cover 17 and the outer sleeve 16 with bolts, adjust the screw-in depth of the threaded adjustment column 18 to change the pre-locking force generated by the compression of the ball spring 13, and the positions of the components when the floating connection assembly is in the initial position are as shown in the figure. Figure 5 As shown, at this time, one ball in the spring groove 22 is in conflict with the tapered section of the threaded adjustment column 18, and the other ball is located in the ball raceway 25 of the outer sleeve 16; at this time, the ball spring 13 and the resistance spring 14 are both in a compressed state, providing a pre-locking force.

[0068] Step 2: Apply horizontal thrust to the door body 6 in the assembled sealing device. Due to the pre-locking force generated by the compression of the ball spring 13 and the resistance spring 14, the floating connection assembly will not compress the stroke; at this time, the entire device can only be pushed forward until the first sealing ring O1 on the end face of the tank cover 5 is pressed into the sealing position on the first sealing end face D1 on the tank body 1 to complete the first end face sealing. After the extrusion seal is in place, the two sealing tank eccentric locks 9 pop up to realize the sealing self-locking function of the sample tank.

[0069] Step 3: Continue to increase the horizontal thrust until the pre-locking force generated by the ball spring 13 is overcome, and the balls in the ball raceway 25 of the outer sleeve 16 are pressed into the spring groove 22 under the action of the thrust; at this time, it is only necessary to overcome the pre-locking force generated by the compression of the resistance spring 14, and the floating connection assembly begins to compress (that is, the resistance spring 14 begins to compress), so that the outer sleeve 16 moves forward relative to the inner sleeve 11, and the door body 6 is driven forward through the door connector 15; when the floating connection assembly is compressed into place, the second sealing ring O2 on the end face of the door frame 8 is also pressed into the sealing position on the second sealing end face D2 embedded in the door body 6 to complete the second end face sealing. At this time, the four door eccentric locks 3 pop up to complete the self-locking function of the door seal. At this time, the positions of the various components of the floating connection assembly are as shown in Figure 6 shown.

[0070] This method reduces the driving force while ensuring the sealing performance: the resistance spring 14 is used between the inner and outer sleeves to provide sufficient compression stroke. After the sealing of the first sealing end face D1 is completed, when pressure continues to be applied, the sealing of the second sealing end face D2 will not accumulate the sealing resistance of the second sealing end face D1 due to the force-controlled unlocking function of the floating connection assembly 7, thereby reducing the sealing resistance, thereby reducing the packaging driving force, and increasing the service life of the sealing ring, while achieving product miniaturization and lightweight.

[0071] like Figure 7 As shown, it is a schematic diagram comparing the pushing stroke and the required driving force after adopting the above-mentioned double end face sealing method (left) and the pushing stroke and the required driving force of the traditional sealing method (right); by comparison, it can be seen that, under the premise of achieving the same pushing stroke, the driving force required by the double end face sealing method in this scheme is much smaller than the driving force required by the traditional sealing method.

[0072] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A floating double seal device for spatial sampling, characterized in that: include: Floating connection assembly, a first sealing ring and a second sealing ring; the objects to be sealed are a sample tank and a hatch; A first sealing ring is provided on the axial end surface of the sample tank cover facing the tank body; A second sealing ring is provided on the end surface of the door frame of the door facing one end of the door body; The tank body and the door frame are fixed on the cabin body, and the tank cover and the door body are fixed outside the cabin; The tank cover is connected to the door body through a floating connection assembly; the floating connection assembly includes: an inner sleeve, a ball, a ball spring, a resistance spring, an outer sleeve and a threaded adjustment column; The sealing tank connector installed on the tank cover is fixedly connected to the pressing block, one end of the inner sleeve is fixedly connected to the pressing block, and the other end is connected to the hatch connector installed on the door body through a resistance spring; The inner sleeve has more than one radial spring groove distributed along the circumferential direction on the circumferential surface thereof, and a stepped threaded hole is provided at the center of the inner sleeve, including an internal threaded section with a larger diameter and a light hole section with a smaller diameter; the threaded adjustment column has an external threaded section matching the internal threaded section of the stepped threaded hole and a tapered section corresponding to the spring groove; a ball spring is coaxially placed in each spring groove, and a ball is provided at each axial end of the ball spring, wherein the ball at one end contacts the outer circumferential surface of the tapered section of the threaded adjustment column at the corresponding position; The outer sleeve is coaxially sleeved on the outside of the inner sleeve, and an annular groove is provided on the inner circumferential surface of the outer sleeve at a position corresponding to the spring groove as a ball raceway; the ball at the other end of the ball spring is located in the ball raceway; the end faces of the ball raceway at both ends of the axial direction are inclined surfaces inclined outward; the ball spring and the resistance spring are both in a compressed state to provide a pre-locking force; One axial end of the outer sleeve is fixedly connected to the door connector, and the outer sleeve can slide axially relative to the inner sleeve to compress the resistance spring.

2. The floating double sealing device for spatial sampling according to claim 1, characterized in that: Two or more spring groove groups are arranged on the circumferential surface of the inner sleeve at intervals in the axial direction, and each spring groove group includes two or more spring grooves evenly spaced in the circumferential direction; The threaded adjustment column has the same number of tapered sections as the spring slot groups, and each tapered section corresponds to the position of a spring slot group.

3. The floating double sealing device for spatial sampling according to claim 1, characterized in that: The tank body is provided with a sealed tank lock for self-locking after the tank cover and the tank body are sealed in place; the hatch door frame is provided with a hatch door lock for self-locking after the door body and the hatch door frame are sealed in place.

4. The floating double sealing device for spatial sampling according to any one of claims 1 to 3, characterized in that: The outer sleeve and the clamping block are both provided with a conical clamping boss for cooperating with a clamping device in the return capsule to axially limit the floating connection assembly.

5. The floating double sealing device for spatial sampling according to any one of claims 1 to 3, characterized in that: A shaft shoulder is arranged on the outer circumferential surface of one end of the inner sleeve connected to the pressing block, and a sleeve end cover is mounted on the shaft shoulder; the outer sleeve is fixedly connected to the sleeve end cover; When the hatch is pushed to make the outer sleeve slide relative to the inner sleeve, the sleeve end cover is pushed by the outer sleeve to move toward the pressing block until it contacts the pressing block.

6. The floating double sealing device for spatial sampling according to claim 5, characterized in that: The inner sleeve is provided with a guide column which cooperates with the guide groove on the sleeve end cover and is used for guiding the outer sleeve during the axial movement.

7. The floating double sealing device for spatial sampling according to any one of claims 1 to 3, characterized in that: The sample tank body is located inside the cabin body, and its open end is fixedly connected to the cabin door frame through a guide rail; a guide rod for cooperating with the guide rail is arranged on the tank cover, and is used for axial movement to realize guidance during the sealing process.

8. The floating double sealing device for spatial sampling according to any one of claims 1 to 3, characterized in that: In addition, a hollow weight-reducing hole is provided on the inner sleeve, and a rib plate is provided at the bottom of the inner sleeve.

9. The floating double sealing device for spatial sampling according to any one of claims 1 to 3, characterized in that: The thread of the internal thread section of the central stepped threaded hole of the inner sleeve is a fine pitch thread.

10. A floating double sealing method for spatial sampling, characterized in that: A floating double sealing device according to any one of claims 1 to 9 above; Step 1: Adjust the screwing depth of the threaded adjustment column to adjust the pre-locking force generated by the compression of the ball spring; Step 2: Apply a horizontal thrust to the door body. Due to the pre-locking force generated by the compression of the ball spring and the resistance spring, the floating connection assembly is not compressed at this time; the tank cover, the floating connection assembly and the door body move forward as a whole until the first sealing ring is pressed onto the sealing end face of the tank body, thereby completing the first end face sealing; Step 3: Continue to increase the horizontal thrust, and when the pre-locking force generated by the ball spring is overcome, the ball in the outer sleeve ball raceway is pressed into the spring groove; when the pre-locking force generated by the compression of the resistance spring is further overcome, the resistance spring begins to compress, causing the outer sleeve to move forward relative to the inner sleeve, and driving the door body forward through the door connector; until the second sealing ring on the end face of the door frame is pressed onto the sealing end face of the door body, thereby completing the second end face seal.

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