Method for connecting vertical rectangular air pipes in narrow space

Abstract

The invention discloses a method for connecting vertical rectangular air pipes in a narrow space. The method comprises the steps that firstly, air pipe flange size information and air pipe periphery installation space size information are collected; 2, the installation position of a bolt on a flange and the installation position of a flange clamp are determined, and the length and the width of the flange clamp are determined; thirdly, bolts are inserted for fixing according to the determined positions, and a flange clamp is placed above the unconnected flanges; and fourthly, a pressure applying device is installed to clamp the flange and the flange clamp. The construction problem of vertical air pipe connection sealing in the narrow space can be solved, especially the problems that in the narrow space where people are difficult to enter, the air pipe connection construction quality is poor, and an air pipe is not tight are solved, and the later maintenance cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of air duct construction in the field of building construction, and specifically relates to a vertical rectangular air duct connection method in a narrow space. Background Art

[0002] Ducts are pipe systems used for air delivery and distribution. According to the cross-sectional shape, they can be divided into circular ducts, oblate ducts, and rectangular ducts. Since circular ducts are large in height and complex to make, rectangular ducts are the main type of ducts used. In the application technology of ducts, the sealing of the joints between ducts is the key, such as using flange connections and using sealants and other sealing treatment measures at the gaps.

[0003] The construction and installation space of the air duct is sometimes very narrow. For example, during the construction of the air duct in the vertical air shaft, the three sides of the vertical air shaft are often surrounded by the structural wall. Since most of the air ducts in the vertical air shaft are pressurized air supply ducts or smoke exhaust ducts of the fire smoke exhaust system, the air duct specifications are large and mostly flange-connected. The space between the air duct and the structural wall is small, resulting in insufficient space for the connection and installation of the air duct, causing construction difficulties or even impossible construction. The construction quality of the air duct connection and installation cannot be ensured. At least one of the two sides of the air duct and the back side have no space for connection operations, resulting in poor construction quality of the air duct connection in the vertical air shaft, loose air ducts, and high maintenance costs in the later stage. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a method for connecting vertical rectangular air ducts in a narrow space, thereby solving the construction problem of sealing the vertical air duct connection in a narrow space, especially avoiding the problem of poor construction quality and loose air duct connection in a narrow space that is difficult for people to enter, thereby saving later maintenance costs. The purpose of the present invention is achieved through the following technical solutions.

[0005] A method for connecting a vertical rectangular air duct in a narrow space, wherein flanges are arranged around the upper and lower pipe joints of the rectangular air duct, and the method comprises the following steps: Step 1: Collect the duct flange size information and the installation space size information around the duct; Step 2: Determine the bolt installation position on the flange and the flange fixture installation position according to the installation space dimension information around the air duct, wherein the flange fixture installation position is a position where the space is limited and it is inconvenient to install the bolts; determine the length and width of the flange fixture according to the flange dimension information, wherein the length of the flange fixture is the same as the flange length at its installation position, and the width of the bottom of the flange fixture is the same as the width of the flange; The flange clamp includes two parts: the left side is a pressure-bearing base of the I-beam structure, and the right side is an inclined pressure piece; the inclined pressure piece is a combination structure of a horizontal bottom plate and a vertical vertical plate, the bottom plate is a rectangular plate integrated with the bottom of the left I-beam structure, the vertical plate is an integrated structure with the waist plate in the middle of the I-beam structure, the vertical plate is flush with the right end of the bottom plate, the vertical plate is a right-angled trapezoid or a right-angled triangle, the left end of the vertical plate is the longer base of the right-angled trapezoid or a right-angled side of the right-angled triangle, the right end of the vertical plate is the shorter base of the right-angled trapezoid or a vertex of the triangle, the upper side of the vertical plate is a hypotenuse, and the angle formed by the hypotenuse and the bottom plate is the fixture angle θ, and the fixture angle θ is 10~30°; Step 3: Insert the bolts to fix according to the position determined in step 2, and place the flange fixture on the unconnected flange, and adjust the flange fixture to make it coincide with the flange; Step 4: Install a pressure device to tighten the flange and the flange clamp, the pressure device comprising: a base, a caliper track vertically connected to the top of the base, a self-locking caliper with one end mounted on the caliper track, a fixed torque screw connected to the other end of the self-locking caliper and parallel to the caliper track, a screw rotating connector arranged at the upper end of the fixed torque screw, and a flange clamp gasket connected to the lower end of the fixed torque screw; place the base at the bottom of the flange, adjust the self-locking caliper, and adjust the flange clamp gasket to directly above the pressure base of the flange clamp; rotate the fixed torque screw through the screw rotating connector to press the pressure base so that the flange clamp and the flange clamp can be tightly connected to the upper and lower air ducts.

[0006] As an improvement to pressure detection, step one also collects working pressure information of the air duct working system, including air duct pressure grade classification and construction sealing requirements; different sealing requirements for different pipes are different according to the pipe grade classification, and different pressure threshold requirements in the pipe are different according to different sealing requirements.

[0007] Further optimization, in step 2, the pressure required for clamping the flange is determined according to the working pressure information of the air duct working system: the force F in the oblique direction of the inclined pressure piece in the flange clamp is determined according to the upper limit of the absolute value of the pressure threshold in the pipeline 合 Threshold value, flange fixture vertical pressure F2=F 合 *sinθ°, then the threshold of F2 is F 合 The product of the threshold and sinθ.

[0008] Furthermore, a pressure sensor is arranged on the upper plane of the base of the pressure-applying device, the pressure sensor is connected to a controller, the controller is connected to an alarm device, a signal receiving module, a comparison module and a signal sending module are arranged in the controller, a threshold value of F2 is arranged in the comparison module, and when the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller controls the alarm device to alarm.

[0009] Furthermore, the screw rotating connection is a small rotating motor, and the output shaft of the small rotating motor is connected to the fixed torque screw; the controller is electrically connected to the switch of the small rotating motor, and when the comparison result of the comparison module is: the pressure value threshold detected by the pressure sensor is less than the threshold of F2, the controller controls the small rotating motor to rotate and drive the fixed torque screw to rotate downward to automatically pressurize the flange clamp.

[0010] As an improvement to the rotation driving mode, the screw rotation connecting piece is a fixed torque handle, and the fixed torque handle is sleeved on the top of the fixed torque screw for manual rotation and pressurization.

[0011] In one application scenario, the narrow space is a vertical air shaft, which is surrounded on three sides and open on one side. The flange of the air duct on the open side of the vertical air shaft is fixedly connected by bolts; a flange clamp is installed on the flange of at least one side of the two sides of the vertical air shaft, and the pressure-bearing base of the flange clamp is located on the side close to the opening of the vertical air shaft, and the inclined pressure piece of the flange clamp is located on the side close to the closed side of the vertical air shaft.

[0012] As an improvement to the equipment, the flange fixture gasket is a diamond friction gasket.

[0013] Furthermore, the upper plane of the pressure-bearing base is a frosted plane.

[0014] Furthermore, the left end of the vertical plate is higher than the upper plane of the pressure-bearing base.

[0015] Beneficial effects of the present invention: The present invention can solve the construction operation problem of sealing the vertical rectangular air duct connection in a narrow space, and avoid the problems of poor construction quality of the air duct connection and loose air duct in the vertical air shaft.

[0016] The method of the present invention can realize tooling, facilitate assembly and disassembly, reduce manpower input, shorten construction period and improve work efficiency.

[0017] The method of the invention can transform traditional practices into tool-based construction, is flexible and practical, and conforms to the concept of "new technology".

[0018] The method of the present invention enables on-site air duct connection to be firm, stable, convenient and efficient, and significantly improves construction quality and efficiency.

[0019] The connection method of the present invention further obtains the pipeline pressure threshold according to the different air duct pressure level classifications and construction sealing requirements, thereby setting the clamp base pressure threshold. When a sealing problem occurs, an alarm can be given immediately, and pressurization can be performed through manual or automatic facilities. The air duct sealing safety maintenance can be performed quickly and conveniently, and maintenance costs can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a flow chart of the method of the present invention; Figure 2 It is a schematic diagram of the flange fixture structure; Figure 3 It is a schematic diagram of the structure of the pressure device; Figure 4 It is a structural schematic diagram of the flange clamp and the pressure device in the combined state; Figure 5 It is a schematic diagram of the three-dimensional structure in Example 1; Figure 6 It is a schematic diagram of the side structure in Example 1; Figure 7 This is a schematic diagram of the structure of the pressure applying device embedded with the pressure sensor in Example 2; Figure 8 This is the force analysis diagram of the flange fixture; Fig. 9 This is a block diagram of the alarm pressurization control principle in Example 3.

[0021] Reference numerals: 1. Screw rotating connector; 2. Fixed torque screw; 3. Flange fixture gasket; 4. Base; 41. Pressure sensor; 5. Self-locking caliper; 6. Caliper track; 7. Pressure base; 8. Inclined pressure piece; 81. Vertical plate; 82. Bottom plate; 9. Air duct; 91. Flange; 10. Wall.

[0022] In order to more clearly illustrate the implementation scheme of the present application, the drawings used in the present application will be briefly introduced below. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the same reference numerals are used to represent the same or similar parts. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] Example 1 like Figure 1As shown, a method for connecting a vertical rectangular air duct in a narrow space is shown. The narrow space in this embodiment is a vertical air shaft, which is surrounded on three sides and open on one side. The rectangular air duct 9 is provided with flanges 91 around the upper and lower pipe joints, including the following steps: Step 1: Collect the duct flange size information and the installation space size information around the duct.

[0025] Step 2: Determine the bolt installation position and flange clamp installation position on the flange based on the installation space dimension information around the air duct. The flange clamp installation position is a position where the space is limited and it is inconvenient to install bolts. Determine the length and width of the flange clamp based on the flange dimension information. The length of the flange clamp is the same as the flange length at its installation position, which can ensure that the entire side of the flange is tightened during use. The width of the bottom of the flange clamp is the same as the width of the flange, which ensures the effect of the clamp and convenient construction.

[0026] In this embodiment, the flange 91 of the air duct 9 located on the open side of the vertical air shaft is fixedly connected by bolts; the walls on both sides are at different distances from the air duct, one side is wider than the air duct and a person can barely pass through, and the other side is narrow and a person cannot pass through. A flange clamp is installed on the flange 91 on the narrow side, and the pressure-bearing base 7 of the flange clamp is located on the side close to the vertical air shaft opening, and the inclined pressure piece 8 of the flange clamp is located on the side close to the closed side of the vertical air shaft for easy operation and adjustment; flange clamps can be set on the back side and the wider side, because people can barely pass through, it is also acceptable to set bolts.

[0027] like Figure 2 As shown, the flange clamp includes two parts: the left side is a pressure-bearing base 7 of the I-beam structure, and the right side is an inclined pressure piece 8; the inclined pressure piece 8 is a combination structure of a horizontal bottom plate 82 and a vertical vertical plate 81, the bottom plate 82 is a rectangular plate integrated with the bottom of the left I-beam structure, the vertical plate 83 is an integrated structure with the waist plate in the middle of the I-beam structure, the vertical plate 81 is flush with the right end of the bottom plate 82, the vertical plate 81 is a right-angled trapezoid, the left end of the vertical plate 81 is the longer bottom side of the right-angled trapezoid, the right end of the vertical plate 81 is the shorter bottom side of the right-angled trapezoid, the upper side of the vertical plate 81 is a hypotenuse, and the angle formed by the hypotenuse and the bottom plate 82 is the fixture angle θ, and the fixture angle θ is 10~30°; the angle can be selected according to the specific use conditions. Generally, if the air duct is placed in the air shaft, the left and right widths of the air shaft are about 1~3m, and the fixture angle θ of 10~30 degrees can meet the use conditions. It is more advantageous to increase the angle as the width of the wind shaft increases. It is preferred that the left end of the vertical plate 81 is higher than the upper plane of the pressure-bearing base 7.

[0028] The technical difficulty of the connection lies in the fact that the force applied to the head and the end of the flange clamp is inconsistent. After using an ordinary flat clamp, the force applied to the head cannot be transmitted to the end, thus affecting the connection effect of the air duct. Figure 8As shown, Step 3: Insert bolts to fix according to the position determined in step 2, and place the flange clamp above the unconnected flange 91, and adjust the flange clamp so that it overlaps and is aligned with the flange 91.

[0029] Step 4: Install the pressure device to tighten the flange 91 and the flange clamp. like Figure 3 As shown, the pressure-applying device includes: a base 4, a caliper track 6 vertically connected above the base 4, a self-locking caliper 5 with one end sleeved on the caliper track 6, a fixed torque screw 2 connected to the other end of the self-locking caliper 5 and parallel to the caliper track 6, a screw rotation connecting member 1 arranged at the upper end of the fixed torque screw 2, and a flange clamp gasket 3 connected to the lower end of the fixed torque screw 2; in this embodiment, the screw rotation connecting member 1 is a fixed torque handle, and the fixed torque handle is sleeved above the fixed torque screw 2 for manual rotation and pressurization.

[0030] The installation process is as follows: place the base 4 at the lower part of the flange 91, adjust the self-locking caliper 5, and adjust the flange clamp gasket 3 to the position just above the pressure base 7 of the flange clamp; rotate the fixed torque screw 2 through the fixed torque handle to press the pressure base 7 so that the flange clamp and the flange 91 are clamped to achieve a tight connection between the upper and lower air ducts 9. Figure 4 , 5 , as shown in Figure 6.

[0031] In this embodiment, the flange fixture gasket 3 is a DAOLER diamond friction gasket. The gasket has the characteristics of excellent wear resistance, high temperature resistance and high hardness. The embedding of diamond particles can significantly increase the static friction coefficient, thereby enhancing the stability and reliability of the connection part.

[0032] The upper plane of the pressure-bearing base 7 is a frosted plane to increase the friction between the pressure-bearing base 7 and the gasket and enhance stability.

[0033] Example 2 This embodiment is an improvement based on Embodiment 1.

[0034] In step one, the working pressure information of the air duct working system is also collected: including the air duct pressure grade classification and construction sealing requirements; different pipe sealing requirements are different according to the pipe grade classification, and different pressure threshold requirements are required in the pipe according to different sealing requirements.

[0035] According to the ventilation and air conditioning engineering quality acceptance specification GB50243-2016, the air duct pressure level classification and construction sealing requirements are: In step 2, in addition to determining the bolt installation position on the flange and the flange fixture installation position according to the installation space size information around the duct, and determining the length and width of the flange fixture according to the flange size information, the pressure required to clamp the flange is also determined according to the working pressure information of the duct working system, specifically: Determine the force F in the oblique direction of the inclined pressing piece 8 in the flange clamp according to the upper limit of the absolute value of the pressure threshold in the pipeline 合 The threshold value, such as Figure 8 As shown, the vertical pressure of the flange clamp is F2=F 合 *sinθ°, then the threshold of F2 is F 合 The product of the threshold and sinθ.

[0036] Micro-pressure air duct system: F 合 ≥125Pa≥125*10 ∧-6 Kg pressure Low pressure duct system: F 合 ≥500Pa≥500*10 ∧-6 Kg pressure Medium pressure duct system: F 合 ≥1500Pa≥1500*10 ∧-6 Kg pressure High pressure air duct system: F 合 ≥2500Pa≥2500*10 ∧-6 Kg pressure In this embodiment, θ=30°, then F2=F 合 *sin30° For air ducts with different working pressure levels, during the air leakage test, the flange clamp changes the force applied by the head end of the clamp by operating the fixing torque, transmits the required sealing pressure to the end, and finally achieves the sealing effect of the air duct.

[0037] And, if Figure 7 As shown, a pressure sensor is arranged on the upper plane of the base 4 of the pressure-applying device. In this embodiment, a groove is preferably arranged on the upper plane of the base 4 and a pressure sensor 41 is embedded in the groove. The upper plane of the base where the pressure sensor 41 is embedded is kept flat and consistent, which can ensure the accuracy of the pressure and protect the service life of the pressure sensor.

[0038] The pressure sensor is connected to a controller, the controller is connected to an alarm device, a signal receiving module, a comparison module and a signal sending module are provided in the controller, a threshold value of F2 is provided in the comparison module, and when the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value of F2, the controller controls the alarm device to alarm.

[0039] Example 3 This embodiment is further improved on the basis of the embodiment 2, the screw rotating connecting member 1 is a small rotating motor, and the output shaft of the small rotating motor is connected to the fixed torque screw 2; the working principle diagram is as shown in Fig. 9 As shown, the controller is electrically connected to the switch of the small rotating motor. When the comparison result of the comparison module is: the pressure value threshold detected by the pressure sensor is less than the threshold of F2, the controller not only controls the alarm, but also controls the small rotating motor to rotate and drive the fixed torque screw 2 to rotate downward to automatically pressurize the flange clamp.

[0040] The above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for connecting vertical rectangular air ducts in a narrow space, wherein flanges (91) are arranged around the upper and lower pipe joints of the rectangular air duct (9), characterized in that: The steps include: Step 1: Collect the duct flange size information and the installation space size information around the duct; Step 2: Determine the bolt installation position on the flange and the flange fixture installation position according to the installation space dimension information around the air duct, wherein the flange fixture installation position is a position where the space is limited and it is inconvenient to install the bolts; determine the length and width of the flange fixture according to the flange dimension information, wherein the length of the flange fixture is the same as the flange length at its installation position, and the width of the bottom of the flange fixture is the same as the width of the flange; The flange clamp comprises two parts, a left part and a right part: a pressure-bearing base (7) of an I-beam structure is on the left side, and a tilted pressing piece (8) is on the right side; the tilted pressing piece (8) is a combination structure of a horizontal bottom plate (82) and a vertical vertical plate (81); the bottom plate (82) is a rectangular plate integrated with the bottom of the left I-beam structure; the vertical plate (81) is an integrated structure with the waist plate in the middle of the I-beam structure; the right end of the vertical plate (81) is flush with the bottom plate (82); the vertical plate (81) is a right-angled trapezoid or a right-angled triangle; the left end of the vertical plate (81) is the longer bottom side of the right-angled trapezoid or a right-angled side of the right-angled triangle; the right end of the vertical plate (81) is the shorter bottom side of the right-angled trapezoid or a vertex of the triangle; the upper side of the vertical plate (81) is a hypotenuse; the angle formed by the hypotenuse and the bottom plate (82) is the fixture angle θ; the fixture angle θ is 10-30°; Step 3: Insert bolts and fix them according to the position determined in step 2, and place the flange clamp on the unconnected flange (91), and adjust the flange clamp so that it overlaps and is aligned with the flange (91); Step 4: Install the pressure device to tighten the flange (91) and the flange clamp. The pressure-applying device comprises: a base (4), a caliper track (6) vertically connected to the top of the base (4), a self-locking caliper (5) with one end sleeved on the caliper track (6), a fixed torque lead screw (2) connected to the other end of the self-locking caliper (5) and parallel to the caliper track (6), a lead screw rotating connecting member (1) arranged at the upper end of the fixed torque lead screw (2), and a flange fixture gasket (3) connected to the lower end of the fixed torque lead screw (2); Place the base (4) under the flange (91), adjust the self-locking caliper (5), and adjust the flange clamp gasket (3) to the position directly above the pressure-bearing base (7) of the flange clamp; rotate the connecting piece (1) by means of a screw to rotate the fixed torque screw (2) to press the pressure-bearing base (7) so that the flange clamp and the flange (91) are clamped to achieve a tight connection between the upper and lower air ducts (9).

2. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: In step one, the working pressure information of the air duct working system is also collected: including the air duct pressure grade classification and construction sealing requirements; different pipe sealing requirements are different according to the pipe grade classification, and different pressure threshold requirements are required in the pipe according to different sealing requirements.

3. The method for connecting vertical rectangular air ducts in a narrow space according to claim 2, characterized in that: In step 2, the pressure required for clamping the flange is determined based on the working pressure information of the air duct working system: the force F in the oblique direction of the inclined pressing piece (8) in the flange clamp is determined based on the upper limit of the absolute value of the pressure threshold in the pipeline. 合 Threshold value, flange fixture vertical pressure F2=F 合 *sinθ°, then the threshold of F2 is F 合 The product of the threshold and sinθ.

4. The method for connecting vertical rectangular air ducts in a narrow space according to claim 3, characterized in that: A pressure sensor (41) is arranged on the upper plane of the base (4) of the pressure-applying device, the pressure sensor (41) is connected to a controller, the controller is connected to an alarm device, a signal receiving module, a comparison module and a signal sending module are arranged in the controller, a threshold value F2 is arranged in the comparison module, and when the comparison result of the comparison module is that the pressure value detected by the pressure sensor is less than the threshold value F2, the controller controls the alarm device to alarm.

5. The method for connecting vertical rectangular air ducts in a narrow space according to claim 4, characterized in that: The screw rotating connection (1) is a small rotating motor, and the output shaft of the small rotating motor is connected to the fixed torque screw (2); the controller is electrically connected to the switch of the small rotating motor, and when the comparison result of the comparison module is: the pressure value threshold detected by the pressure sensor is less than the threshold of F2, the controller controls the small rotating motor to rotate and drive the fixed torque screw (2) to rotate downward to automatically pressurize the flange clamp.

6. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: The screw rotation connection member (1) is a fixed torque handle, and the fixed torque handle is sleeved above the fixed torque screw (2) for manual rotation and pressurization.

7. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: The narrow space is a vertical air shaft, which is surrounded on three sides and open on one side, and the flange (91) of the air duct (9) located on the open side of the vertical air shaft is fixedly connected by bolts; a flange clamp is installed on the flange (91) of at least one side of the two sides of the air duct (9) located on the vertical air shaft, and the pressure-bearing base (7) of the flange clamp is located on the side close to the opening of the vertical air shaft, and the inclined pressure piece (8) of the flange clamp is located on the side close to the closed side of the vertical air shaft.

8. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: The flange fixture gasket (3) is a diamond friction gasket.

9. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: The upper plane of the pressure-bearing base (7) is a frosted plane.

10. The method for connecting vertical rectangular air ducts in a narrow space according to claim 1, characterized in that: The left end of the vertical plate (81) is higher than the upper plane of the pressure-bearing base (7).

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