An emergency flood-proof door and window

Abstract

The application discloses a kind of urgent flood prevention door and window, including door frame, door panel and detachable flood prevention board, flood prevention board includes main plate and the movable sub-plate located in the inside of main plate two sides and with main plate sliding connection, the movable sub-plate is completely stretched from main plate, and the transverse sealing of door frame is realized, when flood occurs, flood prevention board can be installed in the front of door panel, flood prevention board can intercept high flood, prevent flood from entering door directly contact door panel, functional and practical, three groups of seals, sealing air bag, sealing strip and sealing tape are arranged between the main plate and movable sub-plate of flood prevention board, prevent water from seeping between main plate and movable sub-plate, maintain the waterproof effect of flood prevention board itself, while the side surface and bottom surface of flood prevention board are respectively provided with sealing groove, corresponding sealing pad and inflatable outer air bag are arranged in sealing groove, for the sealing of flood prevention board side, maintain the sealing waterproof effect between flood prevention board and door frame.

Description

Technical Field

[0001] This invention relates to the field of door and window technology, and more particularly to an emergency flood-proof door and window. Background Technology

[0002] In areas prone to flooding and for underground structures, it is necessary to improve the flood resistance of doors and windows to protect the interior from flooding. Current technology typically uses multiple sealing strips at the door seams to prevent water from entering the building. However, due to the fluidity and surging pressure of floodwater, ordinary sealing strips are ineffective, and direct contact between floodwater and the door panel can corrode its surface. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of unsatisfactory flood prevention effect of existing doors and windows, and to propose an emergency flood prevention door and window, which is equipped with a detachable flood prevention plate at the door frame for flood prevention, to prevent floodwater from directly contacting the door plate, and at the same time improve the sealing of the edge of the flood prevention plate, reducing the probability of floodwater passing over the flood prevention plate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An emergency flood-proof door and window includes a door frame, a door panel, and a removable flood-proof panel. The door frame has a horizontal sealing protrusion and a vertical sealing protrusion that match the edge of the flood-proof panel at the front of the door panel.

[0006] Preferably, the flood control plate includes a main plate and movable auxiliary plates located inside both sides of the main plate and slidably connected to the main plate. The movable auxiliary plates extend fully from the main plate to achieve lateral sealing of the door frame.

[0007] Preferably, the main board is internally provided with a left threaded rod, a right threaded rod, and a driving bevel gear. One end of the left threaded rod is threadedly connected to the movable auxiliary plate on the left side, and the other end of the left threaded rod is fixedly connected to the left driven bevel gear. One end of the right threaded rod is threadedly connected to the movable auxiliary plate on the right side, and the other end of the right threaded rod is fixedly connected to the right driven bevel gear. Both the right driven bevel gear and the left driven bevel gear mesh with the driving bevel gear. The driving bevel gear connecting shaft is connected to the starter wheel located outside the main board. The surface of the starter wheel is provided with a swirl groove, which is used to insert a swirl starter component that drives the starter wheel to rotate.

[0008] Preferably, the main board and the movable sub-board are provided with a sealing airbag, a sealing strip and a sealing band from the outside to the inside. The sealing airbag, sealing strip and sealing band extend longitudinally along the door frame, and the conveying direction of the sealing band is perpendicular to the longitudinal direction of the door frame.

[0009] Preferably, the sealing airbag is connected to the external inflation cylinder via an external connecting pipe. The external inflation cylinder is equipped with an inflation piston and one end of an inflation piston rod. The end of the inflation piston rod near the movable sub-plate extends out of the external inflation cylinder and is fixedly connected to the limiting block. An auxiliary elastic element is provided in the space of the inflation piston away from the movable sub-plate. The space of the inflation piston near the movable sub-plate is connected to the external connecting pipe.

[0010] Preferably, the movable sub-plate is equipped with an internal inflation cylinder, and the internal inflation cylinder is equipped with an inflation plate and an internal air bladder. An inflation rod is fixedly connected to the end of the inflation plate near the internal air bladder. The inflation rod passes through the movable sub-plate and extends to the side of the limiting block away from the sealing strip. The limiting block is movably connected to the main plate through an external inflation cylinder. The side of the limiting block near the sealing strip is a slope, and the side of the limiting block away from the sealing strip is a flat surface. The right side of the limiting block is used to contact the inflation rod.

[0011] Preferably, the end of the movable subplate is provided with a sealing groove that matches the longitudinal sealing protrusion. A sealing gasket is provided inside the sealing groove. An outer airbag is provided on the sealing gasket, which extends longitudinally along the door frame. The outer airbag expands to fit against the longitudinal sealing protrusion. The outer airbag is connected to the inner airbag through an inner connecting tube.

[0012] Preferably, the conveying surface of the sealing strip is connected to the movable auxiliary plate via a connecting block. The sealing strip contains a support plate and a wheel bracket, with the wheel bracket connected to the support plate via a support cylinder. The support cylinder contains a support piston and a first end of a support piston rod. The second end of the support piston rod extends from the support cylinder and is fixedly connected to the wheel bracket. A support communication space is provided on the side of the support piston away from the support piston rod. A left support elastic element is provided inside the support communication space, and a right support elastic element is provided on the other side of the support piston.

[0013] Preferably, it also includes a sensing plate and a sensing cylinder. The sensing plate is rotatably connected to the outside of the main board via a rotating rod. At least one end of the rotating rod is fixedly connected to one end of a threaded sensing rod. The other end of the threaded sensing rod extends into the interior of the sensing cylinder and is rotatably connected to the sensing piston inside the sensing cylinder. The threaded part of the threaded sensing rod is helically connected to the sensing cylinder. A sensing communication space is provided on one side of the sensing piston. The sensing communication space is connected to the support communication space through an air guide pipe.

[0014] The beneficial effects of this invention are:

[0015] 1. The door frame of this emergency floodproof door and window is equipped with a floodproof plate. In the event of a flood, the floodproof plate can be installed in front of the door panel. The floodproof plate can intercept high-level floods and prevent floods from directly contacting the door panel. It is a practical function. Furthermore, by rotating the starter wheel on the outside of the floodproof plate, the movable auxiliary plate can be extended from both sides of the main plate, making the floodproof door easy to install.

[0016] 2. The main board and movable auxiliary board of this emergency flood control door and window are equipped with three sets of seals: sealing airbag, sealing strip and sealing tape, to prevent water from seeping in between the main board and the movable auxiliary board and to maintain the waterproof effect of the flood control board itself. At the same time, sealing grooves are set on the side and bottom of the flood control board. The sealing grooves are equipped with corresponding sealing gaskets and inflatable external airbags for side sealing and to maintain the sealing and waterproof effect between the flood control board and the door frame.

[0017] 3. The sealing airbags and the external airbags on the sides of this flood control board are inflated during the process of the movable sub-plate extending out of the main plate, making it convenient to use; in addition, an induction plate is set on the outside of the flood control board, which can use the surge of external flood water to enhance the sealing pressure of the sealing strip. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the side of this emergency flood control door and window;

[0019] Figure 2 This is a structural diagram of the front of this emergency flood control door and window;

[0020] Figure 3 This is a structural schematic diagram of the cross-section of the flood control panel of this emergency flood control door and window;

[0021] Figure 4 This is a structural schematic diagram of the movable sub-plate of this emergency flood control door and window;

[0022] Figure 5 This is a structural schematic diagram of the flood control panel at point A of this emergency flood control door and window;

[0023] Figure 6 This is a schematic diagram of the external structure of the flood control panel of this emergency flood control door and window;

[0024] Figure 7 This is a schematic diagram of the structure connecting the external air cylinder of this emergency flood control door and window;

[0025] Figure 8 This is a schematic diagram of the structure connecting the emergency flood control door and window sensor cylinder.

[0026] In the diagram: 1. Main board; 2. Movable sub-plate; 3. Left threaded rod; 4. Right threaded rod; 5. Drive bevel gear; 6. Starter wheel; 7. Sealing strip; 8. Internal inflation cylinder; 9. Induction plate; 10. Internal connecting pipe; 11. External inflation cylinder; 12. Pushing elastic element; 13. Limiting block; 14. Sealing strip; 15. Sealing groove; 16. Sealing airbag; 17. External connecting pipe; 18. Air guide pipe;

[0027] 101. Door frame; 102. Door panel; 103. Flood control board; 104. Horizontal sealing protrusion; 105. Longitudinal sealing protrusion;

[0028] 21. Sealing gasket; 22. External airbag; 23. Connecting block; 31. Left driven bevel gear; 41. Right driven bevel gear; 71. Support plate; 72. Wheel bracket; 73. Support cylinder; 81. Inflation plate; 82. Internal airbag; 83. Inflation rod; 91. Rotating rod; 92. Sensing cylinder; 93. Threaded sensing rod; 921. Sensing piston; 922. Sensing connecting space; 111. Inflation piston; 112. Inflation piston rod; 113. Auxiliary elastic element; 731. Support piston; 732. Support piston rod; 733. Support connecting space; 734. Left support elastic element; 735. Right support elastic element. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figure 1-2 An emergency flood control door and window includes a door frame 101, a door panel 102, and a matching and detachable flood control plate 103. The flood control plate 103 can be installed in front of the door panel 102. The door frame 101 is provided with a transverse sealing protrusion 104 and a longitudinal sealing protrusion 105 matching the edge of the flood control plate 103 in front of the door panel 102. The transverse sealing protrusion 104 and the longitudinal sealing protrusion 105 are used for positioning and limiting the flood control plate during installation.

[0031] refer to Figure 3 Therefore, the flood control plate 103 in this embodiment includes a main plate 1 and movable sub-plates 2 located inside both sides of the main plate 1 and slidably connected to the main plate 1. The movable sub-plates 2 extend completely from the main plate 1 to achieve lateral sealing of the door frame 101.

[0032] The aforementioned main board 1 internally comprises a left threaded rod 3, a right threaded rod 4, and a driving bevel gear 5. One end of the left threaded rod 3 is threadedly connected to the left movable sub-plate 2, and the other end of the left threaded rod 3 is fixedly connected to the left driven bevel gear 31. One end of the right threaded rod 4 is threadedly connected to the right movable sub-plate 2, and the other end of the right threaded rod 4 is fixedly connected to the right driven bevel gear 41. Both the right driven bevel gear 41 and the left driven bevel gear 31 mesh with the driving bevel gear 5. The driving bevel gear 5 is connected by a shaft to a starting wheel 6 located outside the main board 1. The surface of the starting wheel 6 is provided with a swirl groove, which is a spline groove. This flood control plate is equipped with a swirl starter that can be inserted into the swirl starter groove. When the swirl starter is inserted into the swirl starter groove of the driving starting wheel 6, it can drive the starting wheel 6 to rotate and the driving bevel gear 5 to rotate, thereby causing the left threaded rod 3 and the right threaded rod 4 to rotate, and the two movable sub-plates 2 to extend to different sides of the main board 1.

[0033] refer to Figure 4The main board 1 and the movable sub-board 2 are provided with a triple seal from the outside to the inside, consisting of a sealing airbag 16, a sealing strip 14, and a sealing band 7. The sealing airbag 16, the sealing strip 14, and the sealing band 7 extend longitudinally along the door frame.

[0034] A sealing groove 15 is provided on the surface of the main board 1 opposite to the movable sub-board 2, and a sealing airbag 16 is located inside the sealing groove 15. The sealing airbag 16 is connected to an external inflation cylinder 11 via an external connecting pipe 17. The external inflation cylinder 11 is located in a groove on the inner wall of the main board 1 opposite to the movable sub-board 2, and is located on the side of the sealing strip 7 away from the sealing groove 15. (Reference) Figure 7 An inflation piston 111 and one end of an inflation piston rod 112 are disposed inside the external inflation cylinder 11. The end of the inflation piston rod 112 near the movable sub-plate 2 extends out of the external inflation cylinder 11 and is fixedly connected to the limiting block 13. An auxiliary elastic element 113 is disposed in the space of the inflation piston 111 away from the movable sub-plate 2. The space of the inflation piston 111 near the movable sub-plate 2 is connected to the external connecting pipe 17. When the auxiliary elastic element 113 extends, the gas inside the external inflation cylinder 11 can be squeezed into the sealing airbag 16 through the external connecting pipe 17. The expansion of the sealing airbag 16 at the sealing groove 15 achieves the first seal between the main plate 1 and the movable sub-plate 2.

[0035] The sealing strip 14 is a rubber sealing strip. The sealing strip 14 contacts the main board 1 and the movable sub-board 2 respectively, realizing a second seal between the main board 1 and the movable sub-board 2.

[0036] The sealing strip 7 is supported by a conveyor wheel, and its conveying direction is perpendicular to the longitudinal direction of the door frame. The conveying surface of the sealing strip 7 is connected to the movable sub-plate 2 via a connecting block 23. When the movable sub-plate 2 moves relative to the main plate 1, the sealing strip 7 is conveyed to reduce the friction between the movable sub-plate 2 and the main plate 1. The contact surface between the connecting block 23 and the main plate 1 is a concave-convex surface to increase the sealing performance between them.

[0037] refer to Figure 5 The sealing strip 7 has an internal support plate 71 and a wheel bracket 72. The transmission wheel is mounted on the wheel bracket 72, and the wheel bracket 72 is connected to the support plate 71 via a support cylinder 73. (Reference) Figure 8The support cylinder 73 contains a support piston 731 and the first end of a support piston rod 732. The second end of the support piston rod 732 extends from the support cylinder 73 and is fixedly connected to the wheel bracket 72. A support communication space 733 is provided on the side of the support piston 731 away from the support piston rod 732. A left support elastic element 734 is provided inside the support communication space 733, and a right support elastic element 735 is provided on the other side of the support piston 731. The left support elastic element 734 and the right support elastic element 735 cooperate to form pressure applied by the support cylinder 73 to the wheel bracket 72. The sealing strip 7 is a closed annular rubber strip. The pressure applied by the support cylinder 73 to the sealing strip 7 forms a seal between the sealing strip 7 and the main plate 1, achieving a third seal between the main plate 1 and the movable sub-plate 2.

[0038] refer to Figure 6 and Figure 8 The flood control plate 103 is further equipped with an induction plate 9 on its exterior. The induction plate 9 is located at the lower part of the main plate 1 and is rotatably connected to the exterior of the main plate 1 via a rotating rod 91. At least one end of the rotating rod 91 is provided with an induction cylinder 92 and a threaded induction rod 93. One end of the rotating rod 91 is fixedly connected to the threaded induction rod 93, and the other end of the threaded induction rod 93 extends into the interior of the induction cylinder 92 and is rotatably connected to the induction piston 921 inside the induction cylinder 92. The threaded portion of the threaded induction rod 93 is helically connected to the induction cylinder 92. An induction communication space 922 is provided on the side of the induction piston 921 away from the threaded induction rod 93, and the induction communication space 922 is connected to the support communication space 733 via an air guide pipe 18.

[0039] In this embodiment, a ratchet is provided on the rotating rod 91 to ensure that the sensing plate 9 can only rotate in one direction on the main board 1, thereby enabling the unidirectional rotation of the thread sensing rod 93. When the thread sensing rod 93 is in a flood, the water flow in the flood pushes the thread sensing rod 93 to rotate, and the thread sensing rod 93 rotates relative to the sensing cylinder 92. The sensing piston 921 is pushed, and the gas in the sensing communication space 922 enters the support communication space 733 of the support cylinder 73 through the air guide pipe 18, thereby increasing the pressure exerted by the support cylinder 73 on the wheel bracket 72, which is used to enhance the sealing effect between the sealing strip 7 and the main board 1.

[0040] refer to Figure 4 An internal inflation cylinder 8 is installed inside the movable sub-plate 2. Inside the internal inflation cylinder 8, an inflation plate 81 and an internal airbag 82 are installed. The inflation plate 81 is slidably connected to the internal inflation cylinder 8. An inflation rod 83 is fixedly connected to one end of the inflation plate 81 near the internal airbag 82. The inflation rod 83 passes through the movable sub-plate 2 and extends to the side of the limiting block 13 away from the sealing strip 7. The limiting block 13 is movably connected to the main plate 1 via the external inflation cylinder 11. A pushing elastic element 12 is installed between the main plate 1 and the limiting block 13, and the pushing elastic element 12 is fitted onto the outside of the external inflation cylinder 11.

[0041] The two ends of the aforementioned active subplate 2 are provided with sealing grooves that match the longitudinal sealing protrusion 105. A sealing gasket 21 is provided inside the sealing groove. An outer airbag 22 extending longitudinally along the door frame is provided on the sealing gasket 21. The outer airbag 22 expands to fit against the longitudinal sealing protrusion 105. The outer airbag 22 is connected to the inner airbag 82 through the inner connecting pipe 10.

[0042] The limiting block 13 has a sloping side near the sealing strip 7 and a flat side away from the sealing strip 7. The side of the limiting block 13 away from the sealing strip 7 is used to contact the inflation rod 83. When the movable sub-plate 2 moves past the limiting block 13, the auxiliary elastic element 113 of the outer inflation cylinder 11 extends, and the limiting block 13 extends from the inner wall of the main plate 1. The limiting block 13 restricts the movement of the inflation rod 83, and the inflation rod 83 pulls the inflation plate 81 to pressurize the inner airbag 82, so that the gas in the inner airbag 82 enters the outer airbag 22, the outer airbag 22 inflates, and seals both sides of the movable sub-plate 2.

[0043] Similarly, the bottom of the main plate 1 and the movable sub-plate 2 of the flood control plate 103 are also provided with horizontal sealing grooves. The horizontal sealing grooves match the horizontal sealing protrusions 104. The interior of the horizontal sealing grooves is also provided with corresponding external airbags for sealing the bottom of the flood control plate 103. The external airbags of the horizontal sealing grooves are also connected to the internal airbags 82.

[0044] The usage method of this flood control board 103 is as follows:

[0045] When a flood is about to occur, align the bottom sealing groove of the flood control plate 103 with the transverse sealing protrusion 104, insert the starting member into the starting groove of the drive starting wheel 6, rotate the starting wheel 6 and the drive bevel gear 5, thereby causing the left threaded rod 3 and the right threaded rod 4 to rotate, and the two movable sub-plates 2 extend to different sides of the main plate 1 until the sealing grooves on the sides of the two movable sub-plates 2 match the longitudinal sealing protrusion 105.

[0046] During the extension and movement of the movable sub-plate 2, the sealing strip 7 is conveyed to reduce the friction between the movable sub-plate 2 and the main plate 1. After the movable sub-plate 2 moves past the limiting block 13, the auxiliary elastic element 113 and the pushing elastic element 12 of the external inflation cylinder 11 extend, squeezing the gas inside the external inflation cylinder 11 into the sealing airbag 16 through the external connecting pipe 17. The sealing airbag 16 expands at the sealing groove 15, achieving the first seal between the main plate 1 and the movable sub-plate 2. At the same time, the limiting block 13 extends from the inner wall of the main plate 1, restricting the movement of the inflation rod 83. The inflation rod 83 pulls the inflation plate 81 to press the inner airbag 82, causing the gas in the inner airbag 82 to enter the outer airbag 22. The outer airbag 22 expands, sealing both sides of the movable sub-plate 2 and the bottom of the flood control plate 103.

[0047] After the floodwaters submerge the threaded sensing rod 93, the surging water in the floodwaters pushes the threaded sensing rod 93 to rotate. The threaded sensing rod 93 rotates relative to the sensing cylinder 92, and the sensing piston 921 is pushed. The gas in the sensing communication space 922 enters the support communication space 733 of the support cylinder 73 through the air guide pipe 18, thereby increasing the pressure exerted by the support cylinder 73 on the wheel bracket 72, which is used to enhance the sealing effect between the sealing strip 7 and the main board 1.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An emergency flood-proof door and window, comprising a door frame (101) and a door panel (102), characterized in that, It also includes a matching flood control plate (103), and the door frame (101) is provided with a transverse sealing protrusion (104) and a longitudinal sealing protrusion (105) matching the edge of the flood control plate (103) in front of the door panel (102). The flood control plate (103) includes a main plate (1) and movable sub-plates (2) located inside both sides of the main plate (1) and slidably connected to the main plate (1). The movable sub-plates (2) extend completely from the main plate (1) to achieve lateral sealing of the door frame (101). The main board (1) and the movable sub-board (2) are arranged from the outside to the inside with a sealing airbag (16), a sealing strip (14) and a sealing band (7). The sealing airbag (16), the sealing strip (14) and the sealing band (7) extend along the longitudinal direction of the door frame, and the conveying direction of the sealing band (7) is perpendicular to the longitudinal direction of the door frame. The sealing airbag (16) is connected to the external inflation cylinder (11) through the external connecting pipe (17). The external inflation cylinder (11) is provided with an inflation piston (111) and one end of an inflation piston rod (112). The end of the inflation piston rod (112) near the movable sub-plate (2) extends out from the external inflation cylinder (11) and is fixedly connected to the limiting block (13). The space of the inflation piston (111) away from the movable sub-plate (2) is provided with an auxiliary elastic element (113). The space of the inflation piston (111) near the movable sub-plate (2) is connected to the external connecting pipe (17). The movable sub-plate (2) is provided with an internal inflation cylinder (8). The internal inflation cylinder (8) is provided with an inflation plate (81) and an internal airbag (82). The inflation plate (81) is fixedly connected to an inflation rod (83) at one end near the internal airbag (82). The inflation rod (83) passes through the movable sub-plate (2) and extends to the side of the limiting block (13) away from the sealing strip (7). The limiting block (13) is movably connected to the main plate (1) through the external inflation cylinder (11). The side of the limiting block (13) near the sealing strip 7 is a slope, and the side of the limiting block (13) away from the sealing strip 7 is a plane. The right side of the limiting block (13) is used to contact the inflation rod (83). The end of the movable subplate (2) is provided with a sealing groove that matches the longitudinal sealing protrusion (105). A sealing gasket (21) is provided inside the sealing groove. An outer airbag (22) extending longitudinally along the door frame is provided on the sealing gasket (21). The outer airbag (22) expands to fit against the longitudinal sealing protrusion (105). The outer airbag (22) is connected to the inner airbag (82) through the inner connecting pipe (10).

2. The emergency flood control door and window according to claim 1, characterized in that, The main board (1) is internally provided with a left threaded rod (3), a right threaded rod (4) and a driving bevel gear (5). One end of the left threaded rod (3) is threadedly connected to the movable sub-plate (2) on the left side, and the other end of the left threaded rod (3) is fixedly connected to the left passive bevel gear (31). One end of the right threaded rod (4) is threadedly connected to the movable sub-plate (2) on the right side, and the other end of the right threaded rod (4) is fixedly connected to the right passive bevel gear (41). The right passive bevel gear (41) and the left passive bevel gear (31) are both meshed with the driving bevel gear (5). The driving bevel gear (5) is connected to the starting wheel (6) located outside the main board (1) via a connecting shaft. The surface of the starting wheel (6) is provided with a swirl groove, which is used to insert a swirl-starting component that drives the starting wheel (6) to rotate.

3. The emergency flood control door and window according to claim 1 or 2, characterized in that, The conveying surface of the sealing strip (7) is connected to the movable sub-plate (2) through the connecting block (23). The sealing strip (7) is provided with a support plate (71) and a wheel bracket (72). The wheel bracket (72) is connected to the support plate (71) through a support cylinder (73). The support cylinder (73) is provided with a support piston (731) and a first end of a support piston rod (732) inside. The second end of the support piston rod (732) extends out from the support cylinder (73) and fixes the connecting wheel bracket (72). A support communication space (733) is provided on the side of the support piston (731) away from the support piston rod (732). A left support elastic member (734) is provided inside the support communication space (733), and a right support elastic member (735) is provided on the other side of the support piston (731).

4. The emergency flood control door and window according to claim 3, characterized in that, It also includes a sensing plate (9) and a sensing cylinder (92). The sensing plate (9) is rotatably connected to the outside of the main board (1) via a rotating rod (91). At least one end of the rotating rod (91) is fixedly connected to one end of a threaded sensing rod (93). The other end of the threaded sensing rod (93) extends into the interior of the sensing cylinder (92) and is rotatably connected to the sensing piston (921) inside the sensing cylinder (92). The threaded part of the threaded sensing rod (93) is helically connected to the sensing cylinder (92). A sensing communication space (922) is provided on one side of the sensing piston (921). The sensing communication space (922) is connected to the support communication space (733) via an air guide pipe (18).

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