Outer door and window air tightness detection device

Abstract

The utility model provides an outer door and window air tightness detection device, which relates to the field of door and window air tightness detection and comprises a door and window sealing device. The door and window sealing device comprises a sealing plate, a sealing filler strip, a rubber cushion block, a sleeve, a longitudinal threaded rod, a bidirectional threaded rod, a supporting plate frame, a butterfly nut, a sliding plate, an air supply connector, a pressure measuring connector, a sealing cover, a fixing bolt, a guide rod, a rotary knob, a rotary knob and an inserting rod. The front side face of the sealing plate is connected with a sealing cover through bolts. A pressure measuring pipe is mounted at the air outlet end of the pressure measuring joint; the air inlet end of the air supply connector is provided with an air supply pipe. A sleeve is welded to the top end of the sliding plate. The two-way threaded rod is connected with the knob in a welding manner; a rotary button is mounted at the top end of the longitudinal threaded rod; through the arrangement of the door and window sealing device, the damage of a strong adhesive tape to a wall and the waste of a thin film material are effectively avoided, and the problem that the surface of the wall is damaged due to the fact that a thin film and a door and window wall are bonded through an adhesive tape in traditional door and window air tightness detection is solved.

Description

Technical Field

[0001] The utility model belongs to the field of door and window air tightness detection, and more specifically, particularly relates to an external door and window air tightness detection device. Background Art

[0002] The air tightness test of doors and windows is to measure the volume of air that penetrates through the gaps of doors and windows per unit time under a certain pressure difference. Its purpose is to ensure that the doors and windows products can effectively prevent gas from entering the room through the gaps of doors and windows when they are closed. At present, in the air tightness test of doors and windows on the construction site, the test personnel need to cut a cross at the center of the plastic film, and then use strong tape to bond the air supply pipe and the pressure measuring tube to the cross cut position of the plastic film, and then cover the plastic film on the door and window position, and use strong tape to seal the edge of the plastic film to the walls around the doors and windows, and install the detection instrument and fan on the air supply pipe and the pressure measuring tube to perform the air supply air tightness pressure test. It can be seen that the traditional air tightness test of doors and windows uses plastic film with strong tape to seal the door and window parts. Since the strong tape is in contact with the wall, after the measurement is completed, the plastic film and the strong tape are removed from the wall, which is very likely to cause damage to the building wall paint, affecting the aesthetics of the walls around the doors and windows. In addition, the plastic film will be discarded after use, resulting in waste of testing materials and pollution of discarded plastic garbage. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an external door and window air tightness detection device to solve the problem that the conventional door and window air tightness detection uses adhesive tape to bond the film to the door and window wall, causing damage to the wall surface.

[0004] The utility model provides an air-tightness detection device for external doors and windows, comprising an air supply fan; a connecting pipe is installed at the air supply fan outlet, an air-tightness detection instrument is installed at the connecting pipe outlet, an air supply pipe is installed at the air-tightness detection instrument outlet, and a pressure measuring pipe is installed on the left side of the air-tightness detection instrument; it also comprises a window side wall and a door and window sealing device; the door and window sealing device comprises a sealing plate, a rubber pad, a longitudinal threaded rod, a bidirectional threaded rod, a support plate frame, a sliding plate and a sealing cover; a sealing pad strip is bonded to the rear side surface of the sealing plate, and a sealing cover is connected to the front side surface of the sealing plate by fixing bolts, and an air supply joint and a pressure measuring joint are screwed on the front side surface of the sealing cover; a pressure measuring joint is installed at the air outlet end of the pressure measuring joint pressure pipe; an air supply pipe is installed at the air inlet end of the air supply joint; a plug rod is welded and connected to the front side of the support plate frame, a threaded structure is provided on the outer side of the plug rod, and a butterfly nut is screwed on the threaded structure of the plug rod, and two groups of guide rods are welded and connected to the left and right sides of the support plate frame, and a sleeve is nested on the outer side of each group of guide rods, and a rubber pad is installed at the end of the sleeve, and the rubber pad fits tightly against the wall beside the window; a sleeve is welded and connected to the top and bottom ends of the sliding plate; the bidirectional threaded rod is welded and connected to the knob; there are two groups of longitudinal threaded rods, which are symmetrically distributed up and down, a turning knob is installed on the top of the longitudinal threaded rod, and a rubber pad is installed on the bottom end of the longitudinal threaded rod.

[0005] Furthermore, the support plate frame is a frame structure that penetrates from front to back, and through holes are provided at the center positions of the left and right sides of the support plate frame structure. The outer side surfaces of the bidirectional threaded rods have no threaded surfaces and are rotatably connected to the through holes of the support plate frame. The rear side surface of the support plate frame is provided with two groups of symmetrically distributed convex plates, and the center positions of the convex plates are provided with threaded through holes that penetrate from top to bottom. The two groups of longitudinal threaded rods are respectively engaged and connected in the threaded through holes of the convex plates of the support plate frame.

[0006] Furthermore, there are two groups of sliding plates, which are symmetrically distributed on the left and right sides of the support frame. A threaded through hole is provided at the center of each group of sliding plates, and the forward threaded end of the bidirectional threaded rod is meshed and connected in the threaded through hole of the left sliding plate, and the reverse threaded end of the bidirectional threaded rod is meshed and connected in the threaded through hole of the right sliding plate.

[0007] Furthermore, the front side of the sealing plate is provided with four groups of threaded holes, the center of the sealing plate is provided with a rectangular through groove that passes through the front and back, the upper and lower sides of the rectangular through groove are symmetrically provided with through holes, and the two groups of insertion rods are respectively inserted into the two groups of through holes of the sealing plate.

[0008] Furthermore, the sealing cover is a cover structure with an opening on the rear side, a large threaded through hole and a small threaded through hole are provided at the center position of the front side of the sealing cover cover structure, a silicone gasket is provided at the rear edge position of the sealing cover cover structure, and two groups of ear plates are respectively provided on the left and right sides of the sealing cover cover structure, and each group of ear plates is provided with a through hole structure that passes through the front and back.

[0009] Furthermore, a thread is provided on the outer side of the air supply joint near the rear end, a ring plate is provided on the outer side of the air supply joint, a silicone gasket is bonded to the rear side of the ring plate, and the thread on the outer side of the air supply joint is screwed into the large threaded through hole of the sealing cover.

[0010] Furthermore, a thread is provided on the outer side of the pressure measuring joint near the rear end, a ring plate is provided on the outer side of the pressure measuring joint, a silicone gasket is bonded to the rear side of the ring plate, and the thread on the outer side of the pressure measuring joint is screwed into the small threaded through hole of the sealing cover.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. In the utility model, a threaded meshing transmission mechanism is formed by a bidirectional threaded rod and threaded through holes of two sets of sliding plates, and a longitudinal threaded rod and threaded through holes of a support plate frame, so that the longitudinal threaded rod and the sleeve drive the rubber pad to adjust and move according to the height and width of the window, until the rubber pad is tightly fitted on the inner side of the window to support and fix the sealing plate connected to the front end plug rod of the support plate frame, and the butterfly nut presses the sealing plate on the plug rod, and the sealing plate is close to the wall beside the window, thereby abandoning the traditional method of using strong tape to bond film to perform airtight covering of the door and window area in the air tightness test of doors and windows, effectively avoiding the damage of the strong tape to the wall skin and the waste of film material.

[0013] 2. The utility model utilizes the silicone gasket bonded to the ring plate on the outer side of the air supply joint and the pressure measuring joint in combination with the threaded connection structure of the air supply joint and the pressure measuring joint at the two groups of threaded through holes in the sealing cover, thereby realizing the sealed installation of the air supply joint and the pressure measuring joint on the sealing cover, and abandons the traditional method of sealing and bonding the air supply joint and the pressure measuring joint at the cross cut of the film with strong adhesive tape in the air tightness test of traditional doors and windows, thereby improving the air tightness of the installation of the air supply joint and the pressure measuring joint, preventing gas leakage, and ensuring the accuracy of the pressure measurement value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a rear side structural schematic diagram of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the door and window sealing device of the utility model;

[0017] Figure 4 It is a schematic diagram of the rear side structure of the door and window sealing device of the utility model;

[0018] Figure 5 This is a left-side structural schematic diagram of the door and window sealing device of the utility model;

[0019] Figure 6This is a rear structural schematic diagram of the door and window sealing device of the utility model;

[0020] Figure 7 It is a schematic diagram of the exploded structure of the door and window sealing device of the utility model;

[0021] Figure 8 The utility model Figure 7 The schematic diagram of the structure of the enlarged part A in the middle;

[0022] Reference numerals:

[0023] 1. Blower;

[0024] 2. Take over;

[0025] 3. Air supply duct;

[0026] 4. Air tightness detector;

[0027] 5. Pressure measuring tube;

[0028] 6. Wall;

[0029] 7. Door and window sealing device; 701. Sealing plate; 702. Sealing gasket strip; 703. Rubber gasket; 704. Sleeve; 705. Longitudinal threaded rod; 706. Bidirectional threaded rod; 707. Support plate frame; 708. Butterfly nut; 709. Sliding plate; 710. Air supply joint; 711. Pressure measuring joint; 712. Sealing cover; 713. Fixing bolt; 714. Guide rod; 715. Turning knob; 716. Knob; 717. Insert rod. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0031] like Figure 1-8As shown, the utility model provides an external door and window air tightness detection device, including a blower 1; a pipe 2 is installed at the air outlet of the blower 1, an air tightness detector 4 is installed at the air outlet of the pipe 2, an air supply pipe 3 is installed at the air outlet of the air tightness detector 4, and a pressure measuring tube 5 is installed on the left side of the air tightness detector 4; it also includes a window side wall 6 and a door and window sealing device 7; the door and window sealing device 7 includes a sealing plate 701, a sealing pad strip 702, a rubber pad 703, a sleeve 704, a longitudinal thread Rod 705, bidirectional threaded rod 706, support plate frame 707, butterfly nut 708, sliding plate 709, air supply joint 710, pressure measuring joint 711, sealing cover 712, fixing bolt 713, guide rod 714, knob 715, knob 716 and plug rod 717; the rear side of the sealing plate 701 is bonded with a sealing gasket strip 702, the front side of the sealing plate 701 is connected to the sealing cover 712 through the fixing bolt 713, and the front side of the sealing cover 712 is screwed There are air supply joints 710 and pressure measuring joints 711; the pressure measuring joint 711 is installed with a pressure measuring tube 5 at the air outlet; the air supply pipe 3 is installed at the air inlet end of the air supply joint 710; the front side of the support plate frame 707 is welded with a plug rod 717, the outer side of the plug rod 717 is provided with a threaded structure, and the butterfly nut 708 is screwed on the threaded structure of the plug rod 717, and the left and right sides of the support plate frame 707 are welded with two groups of guide rods 714, and the outer side of each group of guide rods 714 is nested Sleeve 704, the end of the sleeve 704 is installed with a rubber pad 703, and the rubber pad 703 is tightly fitted with the window wall 6; the top and bottom ends of the sliding plate 709 are welded with the sleeve 704; the bidirectional threaded rod 706 is welded with the knob 716; the number of longitudinal threaded rods 705 is two groups, the longitudinal threaded rods 705 are symmetrically distributed up and down, the top of the longitudinal threaded rod 705 is installed with a knob 715, and the bottom of the longitudinal threaded rod 705 is installed with a rubber pad 703.

[0032] When the utility model is installing the door and window air tightness detection device at the window, the door and window sealing device 7 is first placed on the inner side of the window of the wall body 6 near the window, and then the knob 716 is manually turned, and the knob 716 drives the two-way threaded rod 706 to rotate. Since the positive thread end and the reverse thread end of the outer side surface of the two-way threaded rod 706 are respectively engaged and connected in the threaded through holes of the two sets of sliding plates 709, the two-way threaded rod 706 drives the two sets of sliding plates 709 to move left and right, and the two sets of sliding plates 709 respectively drive the two sets of sleeves 704 to move along the guide rod 714, until the four sets of sleeves 704 are equipped with rubber pads 703 and tightly fit on the left and right sides of the window inside the wall body 6 near the window, and then the two sets of knobs are respectively turned. The two sets of knobs 715 drive the two sets of longitudinal threaded rods 705 to rotate respectively. Since the longitudinal threaded rods 705 are meshed and connected in the convex plate threaded through holes of the support plate frame 707, the two sets of longitudinal threaded rods 705 move upward and downward along the two sets of convex plate threaded through holes of the support plate frame 707 during the rotation process until the rubber pads 703 carried at the ends of the longitudinal threaded rods 705 are tightly fitted against the upper and lower sides of the window inside the window wall 6, completing the support and fixing work of the longitudinal threaded rods 705 and the sleeve 704 on the support plate frame 707 on the inner side of the window, and then the through holes of the sealing plate 701 are inserted into the insertion rods 717, so that the sealing plate 701 is close to the front wall of the window wall 6, and then the butterfly nuts 708 are tightened. The butterfly nut 708 is connected to the threaded structure on the outer side of the plug rod 717, and moves backward along the plug rod 717. The rear end of the butterfly nut 708 squeezes the front side of the sealing plate 701, so that the sealing pad 702 on the rear side of the sealing plate 701 is tightly fitted on the front wall of the window wall 6, completing the sealing installation of the sealing plate 701 to the window wall 6. Then, the ear plate through hole of the sealing cover 712 is docked on the threaded hole groove of the sealing plate 701, and then the fixing bolt 713 is inserted into the ear plate through hole of the sealing cover 712 and screwed into the threaded hole groove of the sealing plate 701. After that, the rear end threaded structures of the air supply joint 710 and the pressure measuring joint 711 are respectively screwed into the large threaded through hole and the small threaded through hole of the sealing cover 712. The silicone gasket bonded to the rear side of the ring plate of the head 710 and the silicone gasket bonded to the rear side of the pressure measuring joint 711 are both tightly attached to the front side of the sealing cover 712, completing the installation of the door and window air tightness detection device at the window. The air supply fan 1 is started, and the air inhaled by the air supply fan 1 is transported to the air tightness detector 4 through the connecting pipe 2, and then the air is transported from the air supply pipe 3 to the air supply joint 710 through the through pipe of the air tightness detector 4. The air supply joint 710 transports the air into the closed area of ​​the door and window sealing device 7 at the window. At this time, the closed area is filled with gas, and the gas enters the pressure measuring tube 5 through the pressure measuring joint 711. The pressure measuring tube 5 transports the air to the air tightness detector 4 for air pressure detection, and obtains the detection value through the air tightness detector 4.

[0033] In the embodiment of the present disclosure, the support plate frame 707 is a frame structure that passes through from front to back. Through holes are provided at the center positions of the left and right sides of the frame structure of the support plate frame 707. The outer side surfaces of the bidirectional threaded rods 706 have no threaded surfaces and are rotatably connected to the through holes of the support plate frame 707. The rear side surface of the support plate frame 707 is provided with two groups of symmetrically distributed convex plates, and the center positions of the convex plates are provided with threaded through holes that pass through from top to bottom. The two groups of longitudinal threaded rods 705 are respectively meshed and connected in the threaded through holes of the convex plates of the support plate frame 707, so that the longitudinal threaded rods 705 move vertically along the threaded through holes of the convex plates of the support plate frame 707 during rotation, so that the mounting rubber pads 703 at the ends of the two groups of longitudinal threaded rods 705 are respectively tightly fitted to the upper and lower sides of the window inside the window side wall 6, thereby completing the longitudinal support and fixation of the support plate frame 707 inside the window side wall 6 by the longitudinal threaded rods 705.

[0034] In the embodiment of the present disclosure, there are two groups of sliding plates 709, and the sliding plates 709 are symmetrically distributed on the left and right sides of the support plate frame 707. The central portion of each group of sliding plates 709 is provided with a threaded through hole that passes through the left and right sides. The forward threaded end of the two-way threaded rod 706 is meshed and connected in the threaded through hole of the left sliding plate 709, and the reverse threaded end of the two-way threaded rod 706 is meshed and connected in the threaded through hole of the right sliding plate 709. The two-way threaded rod 706 can drive the two groups of sliding plates 709 to move left and right, so that the sliding plates 709 drive the sleeve 704 to move along the guide rod 714, so that the rubber pad 703 installed at the end of the sleeve 704 is tightly fitted to the left and right sides of the window inside the window of the window side wall 6, thereby completing the horizontal support and fixation of the sleeve 704 to the support plate frame 707 inside the window of the window side wall 6.

[0035] In the disclosed embodiment, four groups of threaded holes are provided on the front side of the sealing plate 701, and a rectangular through groove which passes through the front and back is provided at the center of the sealing plate 701. Through holes are symmetrically provided on the upper and lower sides of the rectangular through groove, and two groups of plug rods 717 are respectively inserted into the two groups of through holes of the sealing plate 701. The plug rods 717 cooperate with the butterfly nuts 708 screwed on the outer side to press the sealing pad strip 702 bonded to the rear side of the sealing plate 701 against the front side of the wall 6 near the window, thereby completing the sealing work of the door and window area.

[0036] In the disclosed embodiment, the sealing cover 712 is a cover structure with an opening on the rear side, and a large threaded through hole and a small threaded through hole are provided at the center position of the front side surface of the sealing cover 712 cover structure, and a silicone gasket is provided at the edge position of the rear side of the sealing cover 712 cover structure, and two groups of ear plates are provided on the left side and the right side of the sealing cover 712 cover structure respectively, and each group of ear plates is provided with a through hole structure that passes through the front and back, and the ear plate through holes of the sealing cover 712 are connected to the four groups of threaded holes of the sealing plate 701, and four groups of fixing bolts 713 are respectively inserted into the ear plate through holes of the sealing cover 712 and screwed into the four groups of threaded hole grooves of the sealing plate 701, so that the silicone gasket on the rear side of the sealing cover 712 is tightly fitted to the front side surface of the sealing plate 701, thereby realizing the sealing work at the joint position of the sealing cover 712 and the sealing plate 701.

[0037] In the disclosed embodiment, a thread is provided on the outer side surface of the air supply connector 710 near the rear end, and a ring plate is provided on the outer side surface of the air supply connector 710. A silicone gasket is bonded to the rear side surface of the ring plate. The thread on the outer side surface of the air supply connector 710 is screwed into the large threaded through hole of the sealing cover 712. The silicone gasket bonded to the ring plate of the air supply connector 710 fits tightly against the front side surface of the sealing cover 712, thereby completing the sealed connection between the air supply connector 710 and the sealing cover 712 to prevent air leakage.

[0038] In the disclosed embodiment, a thread is provided on the outer side surface of the pressure measuring joint 711 near the rear end, and a ring plate is provided on the outer side surface of the pressure measuring joint 711. A silicone gasket is bonded to the rear side surface of the ring plate. The thread on the outer side surface of the pressure measuring joint 711 is screwed into the small threaded through hole of the sealing cover 712. The silicone gasket bonded to the ring plate of the pressure measuring joint 711 fits tightly against the front side surface of the sealing cover 712, thereby completing the sealed connection between the pressure measuring joint 711 and the sealing cover 712 to prevent air leakage.

[0039] The installation, connection or setting methods of all the above components are common mechanical methods, such as welding, threaded connection, screw connection, etc., and the specific structures, models and coefficient indicators of all its components are its own technology, as long as it can achieve its beneficial effects, it can be implemented. The above-mentioned air blower 1 and air tightness detector 4 are common components on the market. When you buy them back and use them, you only need to connect them according to the instruction manual purchased together, so I will not repeat them here.

[0040] The technical solution of the present invention is not limited to the scope of the embodiments of the present invention, and the technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. An air tightness detection device for external doors and windows, comprising an air supply fan (1); a connecting pipe (2) is installed at the air outlet of the air supply fan (1); an air tightness detector (4) is installed at the air outlet of the connecting pipe (2); an air supply pipe (3) is installed at the air outlet of the air tightness detector (4); a pressure measuring pipe (5) is installed on the left side of the air tightness detector (4); the characteristics are: It also includes a window wall (6) and a door and window sealing device (7); the door and window sealing device (7) includes a sealing plate (701), a rubber pad (703), a longitudinal threaded rod (705), a bidirectional threaded rod (706), a support plate frame (707), a sliding plate (709) and a sealing cover (712); the rear side of the sealing plate (701) is bonded with a sealing pad strip (702), the front side of the sealing plate (701) is connected to the sealing cover (712) via a fixing bolt (713), and the front side of the sealing cover (712) is screwed with an air supply joint (710) and a pressure measuring joint (711); the air outlet end of the pressure measuring joint (711) is installed with a pressure measuring tube (5); the air inlet end of the air supply joint (710) is installed with an air supply pipe (3); the front side of the support plate frame (707) is welded with a plug rod (717), and the plug rod (711) is screwed with a pressure measuring tube (5). 17) A threaded structure is provided on the outer side surface, and a butterfly nut (708) is screwed on the threaded structure of the plug rod (717). Two groups of guide rods (714) are welded to the left and right sides of the support plate frame (707). A sleeve (704) is embedded on the outer side surface of each group of guide rods (714). A rubber pad (703) is installed at the end of the sleeve (704). The rubber pad (703) fits tightly with the wall (6) beside the window; the top and bottom ends of the sliding plate (709) are welded to the sleeve (704); the bidirectional threaded rod (706) is welded to the knob (716); the number of the longitudinal threaded rods (705) is two groups, and the longitudinal threaded rods (705) are symmetrically distributed up and down. A knob (715) is installed at the top of the longitudinal threaded rod (705), and a rubber pad (703) is installed at the bottom of the longitudinal threaded rod (705).

2. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The support plate frame (707) is a frame structure that is connected from front to back. Through holes are provided at the center positions of the left side and right side of the frame structure of the support plate frame (707). The outer side surface of the bidirectional threaded rod (706) is rotatably connected to the through hole of the support plate frame (707) without a threaded surface. The rear side surface of the support plate frame (707) is provided with two groups of symmetrically distributed protruding plates in the upper and lower parts. The center position of the protruding plates is provided with a threaded through hole that passes through the upper and lower parts. The two groups of longitudinal threaded rods (705) are respectively meshed and connected in the threaded through holes of the protruding plates of the support plate frame (707).

3. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The number of the sliding plates (709) is two groups, and the sliding plates (709) are symmetrically distributed on the left and right sides of the support frame (707). The central portion of each group of sliding plates (709) is provided with a threaded through hole extending left and right, and the forward threaded end of the bidirectional threaded rod (706) is meshedly connected in the threaded through hole of the left sliding plate (709), and the reverse threaded end of the bidirectional threaded rod (706) is meshedly connected in the threaded through hole of the right sliding plate (709).

4. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The front side of the sealing plate (701) is provided with four groups of threaded holes, the center of the sealing plate (701) is provided with a rectangular through slot extending from front to back, through holes are symmetrically provided at the upper and lower sides of the rectangular through slot, and two groups of insertion rods (717) are respectively inserted into the two groups of through holes of the sealing plate (701).

5. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The sealing cover (712) is a cover structure with a rear opening, a large threaded through hole and a small threaded through hole are provided at the center of the front side of the cover structure of the sealing cover (712), a silicone gasket is provided at the rear edge of the cover structure of the sealing cover (712), and two groups of ear plates are provided on the left and right sides of the cover structure of the sealing cover (712), and each group of ear plates is provided with a through hole structure that passes through the front and back.

6. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The air supply connector (710) is provided with a thread at a position near the rear end on the outer side thereof, a ring plate is provided on the outer side thereof, a silicone gasket is bonded to the rear side of the ring plate, and the thread on the outer side of the air supply connector (710) is screwed into the large threaded through hole of the sealing cover (712).

7. The air tightness detection device for exterior doors and windows according to claim 1, characterized in that: The outer side surface of the pressure measuring joint (711) is provided with a thread near the rear end, the outer side surface of the pressure measuring joint (711) is provided with a ring plate, the rear side surface of the ring plate is bonded with a silicone gasket, and the outer side surface of the pressure measuring joint (711) is threadedly screwed into the small threaded through hole of the sealing cover (712).

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