An adaptive sealing structure door suitable for square vacuum chamber and operation method

Abstract

The present invention provides an adaptive sealing structure hatch door suitable for a square vacuum chamber and an operating method thereof, comprising a sealed hatch door, a square vacuum container, a sealed airlock, a sealing ring, a lifting guide rail, and a support frame. The square vacuum container is arranged on the support frame, and an opening is provided on one side of the square vacuum container. The lifting guide rail is relatively fixed to the square vacuum container. The sealed hatch door cooperates with the lifting guide rail and can move along the Y-axis, approaching or moving away from the opening. When the sealed hatch door is closest to the opening, the sealed hatch door and the opening are aligned along the X-axis. The sealed airlock is arranged on the square vacuum container. When the sealed hatch door moves to a position aligned with the opening, the sealed airlock is activated to press the sealed hatch door against the opening along the X-axis. The sealing ring is arranged around the opening and cooperates with the sealed hatch door when it is pressed to achieve sealing.

Description

Technical Field

[0001] The present invention relates to the fields of vacuum environment testing, special environment testing and leak detection testing of satellite components, propulsion subsystems and thrusters, and in particular to an adaptive sealing structure door suitable for a square vacuum cabin and an operating method thereof. Background Art

[0002] At present, square vacuum systems are widely used in vacuum environment tests, reliability tests and leak detection tests of aerospace and other industries due to their advantages of high capacity, high work efficiency, flexibility and convenience. However, the structural strength design and sealed cabin door design of the square vacuum system are relatively difficult. In particular, the translation, lifting and sealing of square cabin doors in confined spaces involve the joint actions of multiple mechanisms, while ensuring the opening and closing of doors and sealing at different positions, which is technically difficult. In addition, the square sealed cabin door is processed with a square flange and its sealing structure design is a technical challenge. The existing square vacuum systems include gantry cabin doors, sliding cabin doors and bell-type cabin doors, which occupy a large space and have low degree of freedom, and are not suitable for sealing in various occasions. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention takes into account the automated control of hatch pre-tightening, lifting and translation according to the needs of the site and actual working conditions, realizes humanized operation, and provides an adaptive sealing structure hatch and operation method suitable for a square vacuum cabin. Through special structural design, adaptive sealing and automated control of the square vacuum cabin door are realized, the system is safe and reliable, and the door sealing performance is good.

[0004] To achieve the above object, the present invention adopts the following scheme:

[0005] The present invention provides an adaptive sealing structure cabin door suitable for a square vacuum cabin, comprising a sealed cabin door, a square vacuum container, a sealed air lock, a sealing ring, a lifting guide rail, and a support frame, wherein:

[0006] The square vacuum container is arranged on the support frame, and an opening is provided on one side of the square vacuum container, with the direction perpendicular to the plane of the opening as the X-axis direction and the direction of the lifting guide rail as the Y-axis direction;

[0007] The lifting guide rail is relatively fixed to the square vacuum container, and the sealed hatch cooperates with the lifting guide rail to be movable along the Y-axis, approaching or moving away from the opening. When the sealed hatch is closest to the opening, the sealed hatch is aligned with the opening along the X-axis.

[0008] The sealing airlock is provided on the square vacuum container. When the sealing door moves to a position aligned with the opening, the sealing airlock is activated to press the sealing door against the opening along the X-axis.

[0009] The sealing ring is arranged around the opening and cooperates with the sealing door to achieve sealing when the sealing door is pressed.

[0010] In some embodiments, the present invention further includes the following technical features:

[0011] When the sealed hatch is closest to the opening, the sealed hatch is separated from the opening in the X-axis direction.

[0012] It also includes a connecting shaft, a connecting shaft fixing seat arranged on the side of the sealed cabin door away from the opening, and a lifting drive mechanism, wherein the middle part of the connecting shaft is fixedly connected to the connecting shaft fixing seat, the end part of the connecting shaft is fixedly connected to the lifting drive mechanism, and the lifting drive mechanism cooperates with the lifting guide rail to drive the connecting shaft to move along the Y-axis.

[0013] The lifting drive mechanism includes a lifting cylinder for providing lifting power, a lifting slider cooperated with the lifting guide rail, and a separation spring connector fixedly connected to the lifting slider, one end of the separation spring connector is fixedly connected to the movable end of the lifting cylinder, and the other end is connected to a pin shaft movable along the X-axis direction, one end of the pin shaft is movably connected to the separation spring connector, and the other end is fixedly connected to the connecting shaft, and the connecting shaft is fixedly connected to the connecting shaft fixing seat, a separation spring is sleeved on the pin shaft, and both ends of the separation spring are respectively in contact with the connecting shaft and the separation spring connector, so that the connecting shaft is away from the separation spring connector.

[0014] There is at least one connecting shaft fixing seat.

[0015] The connecting shaft and the pin shaft are connected via a cross connecting seat.

[0016] It is characterized in that there are two lifting guide rails and two lifting drive mechanisms, which respectively cooperate with the two lifting guide rails.

[0017] There are four sealing air locks, two of which are arranged on one side of the opening, and the other two are arranged on the other side of the opening.

[0018] It also includes a limiting device, which is arranged at both ends of the lifting guide rail and is used to limit the movement of the sealed cabin door.

[0019] The present invention also provides a hatch door operating method for the above-mentioned adaptive sealing structure hatch door suitable for a square vacuum cabin, comprising the following steps:

[0020] Step 1: Initial state check; the sealed hatch is initially located at the bottom of the lifting guide rail, and the lower limit position is positioned by the limit device; the driving cylinder is in the initial state, the separation spring is in a free state, the sealing air lock is in a free state, the sealing ring is positioned in the square vacuum container in an uncompressed state, and the other components are tightened;

[0021] Step 2: The hatch rises. Start the drive cylinder device and set the cylinder lifting speed according to the lifting and lowering time requirements. The system rises to the upper limit position of the limit device according to the cylinder movement rate. The sealed hatch and the square vacuum container are aligned vertically and horizontally. The sealing surface of the sealed hatch and the sealing surface of the square vacuum container maintain a certain distance in the X direction.

[0022] Step 3: Pre-tighten the hatch door; open the sealed airlock device, which presses the sealed hatch door and the square vacuum container tightly. At this time, the driving cylinder device and the sealed airlock device are in a self-locking state, maintaining the pressure state;

[0023] Step 4: Hatch door sealing and vacuum test: vacuum and seal the vacuum system of the square vacuum container according to the test conditions to complete the corresponding test;

[0024] Step 5: Cabin door separation: After the vacuum test is completed, the release sealing airlock device is closed, and the separation spring changes from the compressed state to the free release state, driving the sealed cabin door to separate from the square vacuum container;

[0025] Step 6: The hatch descends and resets; after the sealed hatch is driven to separate from the square vacuum container, the self-locking state of the driving cylinder is released, and it descends at a uniform speed to the lower limit of the limit device according to the set lifting rate, and the driving cylinder returns to its initial state.

[0026] The beneficial effects of the present invention are:

[0027] The present invention is mainly intended to solve the problem of sealing structure design of the sealed hatch of a square vacuum container in a confined space under different states of translation and lifting, and also to maximize the effective space for vacuum testing of test products, which is convenient for automated and humanized operation. Since the container is a square vacuum container, the structural strength design and processing are relatively difficult, and it must withstand positive pressure and vacuum environment conditions at the same time, and the system must work under high vacuum conditions; at the same time, in order to achieve square container volume change and movement, it is necessary to design a corresponding movable sealed hatch, and the system configuration is complex; the system requires to be clean and oil-free and have an optical test channel. The present invention has developed an adaptive seal suitable for a square vacuum cabin. Through a special structural design, the adaptive sealing and automated control of the square vacuum hatch are realized. The system is safe and reliable, and the door sealing performance is good, which solves the problem of sealing the square hatch in the confined space spacecraft product vacuum test under the conditions of translation, lifting and multiple states. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an embodiment of the present invention;

[0029] In the figure: 1-sealed hatch, 2-coupling fixing seat, 3-connecting shaft, 4-cross connecting seat, 5-separation spring, 6-driving cylinder and separation spring connector, 7-driving cylinder, 8-lifting slide, 9-lifting guide rail, 10-limiting device, 11-sealed air lock, 12-sealing ring, 13-square vacuum container, 14-support frame. DETAILED DESCRIPTION

[0030] To make the technical solutions and advantages of the present invention more clear, the technical solutions of the embodiments of the present invention will be fully described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] like Figure 1 As shown, the sealed hatch needs to move in the height direction (Y) and simultaneously move in the lateral direction (X) for pre-tightening, sealing, and separation. In the height direction, two lifting guide rails are configured on both sides of the support frame. The hatch is driven by two sets of cylinder push rod devices to move smoothly in height. The movement direction control system is automatically controlled and is equipped with an in-place safety mechanical limit device. Since the hatch needs to move up and down and be compressed and sealed, a certain amount of movement in the X direction is required. Therefore, a set of short-stroke optical axis slider structures and separation springs are installed on the fixed axis of the hatch in the X direction (separation spring connector). When the door lock is opened, the hatch plate will be away from the square vacuum container by a certain distance, so that there will be no interference with the hatch during the lifting process. When the hatch plate needs to be sealed with the square vacuum container, the air lock locking device is closed to compress the separation spring. When the air lock is closed, it is pressed against the separation door plate. The separation door plate is compressed and sealed along the X-axis direction through the cross-connection seat compression spring, ensuring that the hatch and the square vacuum container are tightly fitted and sealed. Four sets of sealing air locks are set at the docking flanges of the square vacuum container and the hatch, as shown in the figure. Figure 1 As shown, two sets are set above the square vacuum container and two sets are set at symmetrical positions at its bottom to automatically control the locking or loosening. The locking mechanism is compact and beautiful.

[0033] The sealed hatch 1 is connected to the coupling fixing seat 2; the connecting shaft 3 is connected to the coupling fixing seat 2 and the cross connecting seat 4, and the cross connecting seat 4 is connected to the driving cylinder and separation spring connector 6 via a separation spring 5 on the pin shaft; one end of the driving cylinder and separation spring connector 6 is fixedly connected to the driving cylinder 7, and the other end is tightly connected to the lifting slider 8. The lifting slider 8 is connected to the lifting guide rail 9 with a clearance fit, and the top and bottom ends of the lifting guide rail 9 are installed with a limit device 10. The lifting guide rail 9, the driving cylinder 7 and the square vacuum container 13 are fixedly connected to the support frame 14. Four sets of sealing air locks 11 are fixed to the square vacuum container 13. The sealing ring 12 is embedded in the trapezoidal groove on the flange surface of the square vacuum container 13 according to the vacuum design standard. The specific connection diagram is shown in the attached figure. Figure 1 shown.

[0034] The above-mentioned sealed cabin door, square vacuum container, coupling fixing seat, cross connecting seat, separation spring, driving cylinder and separation spring connecting parts, lifting slider, lifting guide rail and limit device are all made of 304 stainless steel, the connecting shaft is 45# steel, the support frame, driving cylinder and sealing air lock are all made of ordinary carbon steel, and the sealing ring is made of fluororubber.

[0035] The surface finish of the sealing surface of the hatch flange and the bottom surface of the square vacuum container sealing groove is not greater than 1.6. Considering that the flange is locally heated during the welding process of the sealing surface and the sealing groove, the large thermal stress will cause deformation, and the sealing ring deformation of 0.4mm to 0.6mm is increased. The compression rate of the sealing ring is generally 15% to 30%, and the permeability is less than 10 -7 PaL / s; rubber compression filling factor Φ>1.0, fluororubber breaking strength>17MPa at a temperature of 250℃~-40℃. The sealing groove trapezoidal angle is 40 degrees. The total leakage rate of the above-mentioned sealed hatch structure is less than 1×10 -9 Pa.m 3 / s.

[0036] The above-mentioned driving cylinders are calculated based on a driving pressure of 0.3MPa to 0.5MPa, and the driving force is calculated as S=F / P. Two 80 cylinders are selected based on the weight of the sealed cabin door.

[0037] The above-mentioned separation spring selects a standard stainless steel spring, and a stainless steel spring with a wire diameter of not less than 1.6 mm is selected according to the pin diameter. The outer diameter of the spring is 20 mm to 40 mm, and the pitch is generally 6.7 mm.

[0038] The device performs the following steps to test the movement, lifting, pre-tightening, sealing and vacuum testing of the square vacuum container hatch:

[0039] Step 1: Initial status check; the initial position of the hatch is at the bottom of the lifting guide rail (9), as shown in Figure 1In the state shown, it is positioned by the limit device (10); the driving cylinder (7) is also in the initial state, the separation spring (5) is in a free state, the sealing air lock (11) is in a free state, the sealing ring (12) is positioned in the square vacuum container (13) in an uncompressed state, and the other components are all tightened.

[0040] Step 2: The hatch rises; two sets of driving cylinder devices (7) are started, and the cylinder lifting speed is set to 20 cm / min according to the lifting and lowering time requirements. The system rises to the upper limit position of the limit device (10) according to the cylinder movement rate, and the sealed hatch (1) and the square vacuum container (13) are in a vertical and horizontal alignment state, and the sealing surface of the sealed hatch (1) and the sealing surface of the square vacuum container (13) are about 5 mm apart in the X direction;

[0041] Step 3: pre-tighten the hatch; open the four sets of sealing air locks (11), which press the sealed hatch (1) and the square vacuum container (13) tightly. At this time, the two sets of driving cylinder devices (7) and the four sets of sealing air locks (11) are in a self-locking state, maintaining the pressure state;

[0042] Step 4: Hatch door sealing and vacuum test: vacuum and seal the vacuum system configured in the square vacuum container (13) according to the test conditions to complete the corresponding test;

[0043] Step 5: Separation of the hatch; after the vacuum test is completed, the four sets of sealing air locks (11) are closed and released, and the separation spring (5) changes from a compressed state to a free release state, driving the sealed hatch (1) to separate from the square vacuum container (13);

[0044] Step 6: The hatch is lowered and reset; after the sealed hatch (1) is driven to separate from the square vacuum container (13), the self-locking state of the driving cylinder (7) is released, and the cylinder is lowered at a constant speed according to the set lifting rate to the lower limit of the limit device (10). The driving cylinder is restored to its initial state.

[0045] The present invention has the following beneficial effects:

[0046] 1. Small footprint, high capacity and high work efficiency, flexible and convenient, easy to pre-tighten, lift and translate the hatch during vacuum testing, overcoming the difficulty of moving and sealing square sealed hatches in confined spaces;

[0047] 2. The square vacuum container has a large effective space. Through the special structural design, the square vacuum hatch has achieved adaptive sealing and automatic control;

[0048] 3. The system is safe and reliable, realizing lifting limit and interlocking after moving into position;

[0049] 4. The standard spring and drive mechanism can be adaptively selected according to the weight and action mode of the sealed hatch mechanism;

[0050] 5. The door has good sealing performance and is not prone to interference with the flange surface of the square container. The total leakage rate of the door sealing structure is less than 1×10 -9 Pa.m 3 / s.

[0051] In this specification, reference to terms such as "one embodiment" and "example" means that a specific feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the exemplary description of the above terms does not necessarily mean that they are appropriately combined in the corresponding embodiment or example.

[0052] It must be pointed out that the description of the above embodiments is not intended to be limiting but only to help understand the core idea of the present invention. For ordinary technicians in this technical field, any improvements to the present invention and alternatives equivalent to this product, without departing from the principles of the present invention, also fall within the scope of protection of the claims of the present invention.

Claims

1. An adaptive sealing structure door suitable for a square vacuum chamber, characterized in that: It includes a sealed hatch, a square vacuum container, a sealed air lock, a sealing ring, a lifting guide rail, and a support frame, among which: The square vacuum container is arranged on the support frame, and an opening is provided on one side of the square vacuum container, with the direction perpendicular to the plane of the opening as the X-axis direction and the direction of the lifting guide rail as the Y-axis direction; The lifting guide rail is relatively fixed to the square vacuum container, and the sealed hatch cooperates with the lifting guide rail to be movable along the Y-axis, approaching or moving away from the opening. When the sealed hatch is closest to the opening, the sealed hatch is aligned with the opening along the X-axis. The sealing airlock is provided on the square vacuum container. When the sealing door moves to a position aligned with the opening, the sealing airlock is activated to press the sealing door against the opening along the X-axis. The sealing ring is arranged around the opening and cooperates with the sealing door to achieve sealing when the sealing door is pressed tightly; It also includes a connecting shaft, a connecting shaft fixing seat provided on the side of the sealed hatch away from the opening, and a lifting drive mechanism, wherein the middle portion of the connecting shaft is fixedly connected to the connecting shaft fixing seat, the end portion of the connecting shaft is fixedly connected to the lifting drive mechanism, and the lifting drive mechanism cooperates with the lifting guide rail to drive the connecting shaft to move along the Y-axis; The lifting drive mechanism includes a lifting cylinder for providing lifting power, a lifting slider cooperated with the lifting guide rail, and a separation spring connector fixedly connected to the lifting slider, one end of the separation spring connector is fixedly connected to the movable end of the lifting cylinder, and the other end is connected to a pin shaft movable along the X-axis direction, one end of the pin shaft is movably connected to the separation spring connector, and the other end is fixedly connected to the connecting shaft, and the connecting shaft is fixedly connected to the connecting shaft fixing seat, a separation spring is sleeved on the pin shaft, and both ends of the separation spring are respectively in contact with the connecting shaft and the separation spring connector, so that the connecting shaft is away from the separation spring connector.

2. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: When the sealed hatch is closest to the opening, the sealed hatch is separated from the opening in the X-axis direction.

3. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: There is at least one connecting shaft fixing seat.

4. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: The connecting shaft and the pin shaft are connected via a cross connecting seat.

5. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: There are two lifting guide rails and two lifting drive mechanisms, which respectively cooperate with the two lifting guide rails.

6. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: There are four sealing air locks, two of which are arranged on one side of the opening, and the other two are arranged on the other side of the opening.

7. The adaptive sealing structure door for a square vacuum chamber according to claim 1, characterized in that: It also includes a limiting device, which is arranged at both ends of the lifting guide rail and is used to limit the movement of the sealed cabin door.

8. A hatch door operating method, for use with an adaptive sealing structure hatch door suitable for a square vacuum cabin according to any one of claims 1 to 7, comprising the following steps: Step 1: Initial state check; the sealed hatch is initially located at the bottom of the lifting guide rail, and the lower limit position is positioned by the limit device; the driving cylinder is in the initial state, the separation spring is in the free state, the sealing air lock is in the free state, the sealing ring is positioned in the square vacuum container in the uncompressed state, and the other components are tightened; Step 2: The hatch rises. Start the cylinder drive device and set the cylinder lifting speed according to the lifting and lowering time requirements. The system rises to the upper limit position of the limit device according to the cylinder movement rate. The sealed hatch and the square vacuum container are aligned vertically and horizontally. The sealing surface of the sealed hatch and the sealing surface of the square vacuum container maintain a certain distance in the X direction. Step 3: Pre-tighten the hatch door; open the sealing airlock device, which presses the sealed hatch door and the square vacuum container tightly. At this time, the driving cylinder device and the sealing airlock device are in a self-locking state, maintaining the pressure state; Step 4: Hatch door sealing and vacuum test: vacuum and seal the vacuum system of the square vacuum container according to the test conditions to complete the corresponding test; Step 5: Hatch door separation: After the vacuum test is completed, the release sealing airlock device is closed, and the separation spring changes from the compressed state to the free release state, driving the sealed hatch door to separate from the square vacuum container; Step 6: The hatch descends and resets; after the sealed hatch is driven to separate from the square vacuum container, the self-locking state of the driving cylinder is released, and it descends at a uniform speed to the lower limit of the limit device according to the set lifting rate, and the driving cylinder returns to its initial state.

Images