A reducing fitting for a tee pipe and a method for installing the fitting.

Abstract

This application relates to a reducing fitting for a tee pipe and a method for installing the fitting, belonging to the technical field of reducing tee pipes. It includes a reducing fitting body detachably connected to the branch port of the tee pipe. A fixed flange is fixedly connected to the reducing fitting body near the end of the tee pipe. A connecting flange matching the fixed flange is fixedly connected to the branch port of the tee pipe. A connecting member is provided on the connecting flange. A fixing member connected to the connecting member is provided on the fixed flange. A limiting component is provided on the fixing member to limit the fixing member on the fixed flange. When the fixing member abuts against the side of the fixed flange away from the connecting flange, the limiting end of the limiting component connects to the fixed flange. This application has the effect of reducing the loosening of the reducing fitting body due to intermittent vibration.

Description

Technical Field

[0001] This application relates to the technical field of reducing tee pipes, and in particular to a reducing fitting for tee pipes and a method for installing the fitting. Background Technology

[0002] A reducing tee is a pipe whose branch pipe diameter is different from that of the main pipe. Reducing tees are mainly used where the main pipeline needs to branch off. They are widely used in the construction and maintenance of projects in industries such as petrochemicals, oil and gas, liquefied gas, fertilizers, power plants, nuclear power, shipbuilding, papermaking, pharmaceuticals, food hygiene, and urban construction.

[0003] To achieve the effect of reducing diameter, existing tee pipes typically have a reducing fitting installed at the branch end, thus becoming a reducing tee pipe; see reference. Figure 1 When installing a reducing fitting at the branch port of a tee pipe, the flange on the reducing fitting is connected to the flange on the branch port of the tee pipe. Then, the two flanges are fixed by bolts and nuts that are threaded to the bolts, thus realizing the installation of the reducing fitting at the branch port of the tee pipe.

[0004] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist: While bolts and nuts are used to fix the flanges on the reducing joint and the branch pipe of the tee, the medium (liquid or gas) is not continuously transported within the reducing tee. Instead, the transport is subject to sudden stops and starts depending on the actual situation. This sudden stop and start will cause intermittent vibration in the reducing tee, which can easily loosen the bolts, thus affecting the normal use of the reducing tee. Summary of the Invention

[0005] To reduce the occurrence of loosening of the reducing fitting body due to intermittent vibration, this application provides a reducing fitting for a tee pipe and a method for installing the fitting.

[0006] Firstly, the reducing fitting for a tee pipe provided in this application adopts the following technical solution: A reducing fitting for a tee pipe includes a reducing fitting body detachably connected to a branch port of the tee pipe. A fixed flange is fixedly connected to the reducing fitting body near the port of the tee pipe. A connecting flange matching the fixed flange is fixedly connected to the branch port of the tee pipe. A connecting member is provided on the connecting flange. A fixing member connected to the connecting member is provided on the fixed flange. A limiting component is provided on the fixing member for limiting the fixing member on the fixed flange. When the fixing member abuts against the side of the fixed flange away from the connecting flange, the limiting end of the limiting component is connected to the fixed flange.

[0007] By adopting the above technical solution, the fixed flange and the connecting flange are fitted together, and the fastener and the connecting element are connected. Then, the limiting end of the limiting component is connected to the fixed flange, thereby limiting the fastener on the fixed flange and reducing the occurrence of loosening of the reducing joint body due to intermittent vibration.

[0008] Preferably, the connecting flange has a connecting notch, and the connecting member is rotatably connected to the connecting notch of the connecting flange. The fixing flange has a fixing notch, which corresponds to and communicates with the connecting notch at the corresponding position. The fixing notch allows the connecting member to be snapped into.

[0009] By adopting the above technical solution, the connector is snapped into the fixing notch and connected to the fixing part, thereby completing the detachable connection of the reducing connector body to the branch pipe port of the tee pipe.

[0010] Preferably, a limiting ring is fixedly connected to one end of the fastener, and a limiting groove matching the limiting ring is provided on the side of the fixed flange away from the connecting flange. An annular groove is provided on the periphery of the limiting groove, and the limiting end of the limiting component is inserted into the annular groove.

[0011] By adopting the above technical solution, during the connection process between the fastener and the connector, the limiting ring is slid into the limiting groove, and the limiting end of the limiting component is inserted into the annular groove, thereby limiting the fastener to the fixed flange.

[0012] Preferably, the fixing member has a plug-in groove, and the limiting component includes a control rod slidably connected in the plug-in groove, a connecting block rotatably connected to the bottom end of the control rod, a plug-in rod fixedly connected to the end of the connecting block away from the control rod, and a locking component disposed in the limiting ring and abutting the end of the plug-in rod away from the connecting block. A return spring is sleeved on the plug-in rod. When the end of the plug-in rod away from the connecting block abuts against the locking component, the plug-in rod pushes the locking component to move laterally, and the locking end of the locking component passes through the limiting ring and plugs into the annular groove.

[0013] By adopting the above technical solution, the operator presses down the plug rod with the control lever, so that the plug rod abuts against the locking component, thereby causing the plug rod to push the locking component to move laterally, and the locking end of the locking component passes through the limit ring and engages with the annular groove, thereby limiting the fixing component to the fixed flange.

[0014] Preferably, a slider is fixedly connected to the periphery of the control lever, and a U-shaped groove is provided on the inner side wall of the insertion slot, and the slider is slidably connected to the groove.

[0015] By adopting the above technical solution, the sliding connection between the slider and the groove can limit the movement of the control lever.

[0016] Preferably, the limiting ring has an installation groove, the locking component is disposed in the installation groove, one end of the plug rod slides into the installation groove and abuts against the locking component, the locking component includes a movable block disposed in the installation groove and slidably connected to the installation groove, an abutment disposed on the side of the movable block near the plug rod, and a locking rod fixedly connected to the side of the movable block away from the abutment. A guide rod slidably connected to the movable block is fixedly connected in the installation groove of the limiting ring, and each guide rod is fitted with a spring spring. The abutment abuts against the plug rod, and the locking rod extends through the limiting ring to the outside of the limiting ring and is inserted into the annular groove.

[0017] By adopting the above technical solution, when the plug rod contacts the abutment, the end of the locking rod away from the moving block extends through the limiting ring to the outside of the limiting ring, and the end of the locking rod extending to the outside of the limiting ring is plugged into the annular groove.

[0018] Preferably, the abutting member includes a mounting base fixedly connected to the side of the moving block away from the locking rod and an abutting wheel rotatably connected to the mounting base. The end of the insertion rod away from the connecting block is provided with a rounded chamfer, and the rounded chamfer of the insertion rod abuts against the abutting wheel.

[0019] By adopting the above technical solution, the rounded chamfer of the plug rod abuts against the abutting wheel, reducing the friction when the plug rod contacts the abutting wheel.

[0020] Preferably, a sealing assembly is provided between the fixed flange and the connecting flange. The sealing assembly includes a sealing ring and a sealing gasket fixedly connected to the outer ring side of the sealing ring. The sealing gasket abuts between the fixed flange and the connecting flange. Each of the fixed flange and the connecting flange has a receiving groove on its side that is close to each other. The two receiving grooves together form a receiving cavity that matches the contour of the sealing ring.

[0021] By adopting the above technical solution, the sealing component enhances the sealing performance of the connection between the fixed flange and the connecting flange.

[0022] Preferably, the top and bottom surfaces of the sealing ring are provided with limiting rings, and each limiting ring is fitted with a washer.

[0023] By adopting the above technical solution, the gasket is placed on the limiting ring, thereby improving the pressure-bearing capacity of the sealing ring.

[0024] Secondly, this application provides a method for installing a reducing fitting for a tee pipe, comprising the following steps: S1: Fit the fixed flange with the connecting flange and connect the fastener and the connector until the limit ring slides into the limit groove; S2: Press down the control lever so that the plug rod abuts against the abutment. The plug rod pushes the locking lever so that the end of the locking lever away from the moving block extends through the limiting ring to the outside of the limiting ring and engages with the annular groove to complete the limiting of the limiting ring. S3: Rotate the control lever in the opposite direction to complete the limit of the control lever.

[0025] By adopting the above technical solution, the reducing connector body can be stably installed at the branch port of the tee pipe.

[0026] In summary, this application includes the following beneficial technical effects: 1. Fit the fixed flange with the connecting flange and connect the fastener and the connecting part. Then connect the limiting end of the limiting component with the fixed flange to limit the fastener on the fixed flange and reduce the occurrence of loosening of the reducing joint body due to intermittent vibration. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the background technology in this application.

[0028] Figure 2 This is a schematic diagram of the overall structure of this application.

[0029] Figure 3 yes Figure 2 A schematic diagram of the structure of part A.

[0030] Figure 4 Figure 2 A cross-sectional structural diagram.

[0031] Figure 5 yes Figure 4 A schematic diagram of the structure of part B.

[0032] Figure 6 This is a schematic diagram of the nut structure of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Reducer body; 11. Fixed flange; 111. Receiving groove; 112. Fixed notch; 113. Limiting groove; 114. Annular groove; 12. Connecting flange; 121. Connecting notch; 2. Connecting component; 3. Fixing component; 31. Limiting ring; 311. Mounting groove; 32. Insertion groove; 33. Slide groove; 4. Limiting assembly; 41. Control lever; 411. Slider; 42. Connecting block; 43. Insertion rod; 44. Locking component; 441. Moving block; 442. Abutment component; 443. Locking rod; 444. Spring; 445. Guide rod; 45. Return spring; 5. Sealing assembly; 51. Sealing ring; 511. Limiting ring; 512. Washer; 52. Sealing gasket. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 2-6 This application will be described in further detail.

[0035] This application discloses a reducing fitting for a tee pipe. (Refer to...) Figure 2 and Figure 3 The reducing fitting for a tee pipe includes a reducing fitting body 1 detachably connected to the branch port of the tee pipe. A fixed flange 11 is fixedly connected to the reducing fitting body 1 near the port of the tee pipe, and a connecting flange 12 matching the fixed flange 11 is fixedly connected to the branch port of the tee pipe. Both the fixed flange 11 and the connecting flange 12 are square flanges. A connecting piece 2 is provided on the connecting flange 12, and a fixing piece 3 is provided on the fixed flange 11. The fixing piece 3 is connected to the connecting piece 2, thereby making the fixed flange 11 and the connecting flange 12 detachably connected. A limiting component 4 is provided on the fixing piece 3, which is used to limit the fixing piece 3 to the fixed flange 11. When the fixing piece 3 abuts against the side of the fixed flange 11 away from the connecting flange 12, the limiting end of the limiting component 4 is connected to the fixed flange 11, thereby limiting the fixing piece 3 to the fixed flange 11. At the same time, a sealing component 5 is provided between the fixed flange 11 and the connecting flange 12, which is used to enhance the sealing performance of the connection between the fixed flange 11 and the connecting flange 12.

[0036] Reference Figure 4 and Figure 5 The sealing assembly 5 includes a sealing ring 51 and a sealing gasket 52 horizontally disposed on the outer ring side of the sealing ring 51. The sealing gasket 52 is square, and its outline matches the outline of the fixed flange 11. The inner ring side of the sealing gasket 52 is fixedly connected to the outer ring side of the sealing ring 51. The sealing gasket 52 abuts between the fixed flange 11 and the connecting flange 12. In order to make the sealing ring 51 fit more tightly in the fixed flange 11 and the connecting flange 12, a receiving groove 111 is provided on the side of the fixed flange 11 and the connecting flange 12 that are close to each other. The openings of the two receiving grooves 111 are arranged opposite each other, and the two receiving grooves 111 are respectively connected to the flange opening of the fixed flange 11 and the flange opening of the connecting flange 12. When the fixed flange 11 and the connecting flange 12 abut against each other, the two receiving grooves 111 together form a receiving cavity that matches the outline of the sealing ring 51.

[0037] Meanwhile, to improve the pressure-bearing capacity of the sealing ring 51, both the top and bottom surfaces of the sealing ring 51 are integrally formed with protruding limiting rings 511, and each limiting ring 511 is fitted with a washer 512. In this embodiment, the washer 512 is a nylon washer; the side of the washer 512 away from the sealing ring 51 is flush with the side of the limiting ring 511 away from the sealing ring 51; thus, when the sealing ring 51 is pressed into the receiving cavity formed by the two receiving grooves 111, the two washer 512 respectively abut against the two receiving grooves 111, thereby improving the pressure-bearing capacity of the sealing ring 51.

[0038] Reference Figure 2 and Figure 6 In this embodiment, the connector 2 is a screw, and the four corners of the connecting flange 12 are provided with connecting notches 121. The number of screws is consistent with the number of connecting notches 121 and they correspond one-to-one. A horizontal shaft is fixedly connected to the connecting notch 121 of the connecting flange 12. The horizontal shaft passes through the end of the screw and is rotatably connected to the screw. The four corners of the fixed flange 11 are provided with fixing notches 112. When the fixed flange 11 abuts against the connecting flange 12, the fixing notch 112 corresponds to and communicates with the corresponding connecting notch 121. The fixing notch 112 allows the screw to be fastened in.

[0039] In this embodiment, the fixing member 3 is a nut, which is threadedly connected to the screw. A limiting ring 31 is fixedly connected to one end of the nut. A limiting groove 113 matching the limiting ring 31 is opened on the side of the fixing flange 11 away from the connecting flange 12. The limiting groove 113 communicates with the fixing notch 112 corresponding to the position. An annular groove 114 is opened on the periphery of the limiting groove 113. The limiting component 4 is set inside the nut. When the nut is threadedly connected to the screw, the limiting ring 31 slides into the limiting groove 113. The limiting end of the limiting component 4 is inserted into the annular groove 114, thereby limiting the nut on the fixing flange 11.

[0040] Reference Figure 2 and Figure 6 The nut has a vertically oriented, upward-facing insertion slot 32. The limiting assembly 4 includes a control lever 41 slidably connected within the insertion slot 32, a connecting block 42 rotatably connected to the bottom of the control lever 41, an insertion rod 43 fixedly connected to the end of the connecting block 42 away from the control lever 41, and a locking component 44 disposed within the limiting ring 31 and abutting against the end of the insertion rod 43 away from the connecting block 42. A return spring 45 is sleeved on the insertion rod 43. The top end of the return spring 45 is fixedly connected to the end of the connecting block 42 away from the control lever 41, and the bottom end of the return spring 45 is fixedly connected to the inner bottom wall of the insertion slot 32. When the end of the insertion rod 43 away from the connecting block 42 abuts against the locking component 44, the insertion rod 43 pushes the locking component 44 to move laterally, and the locking end of the locking component 44 passes through the limiting ring 31 and engages with the annular groove 114.

[0041] Reference Figure 2 and Figure 6A slider 411 is fixedly connected to the periphery of the control lever 41. A U-shaped sliding groove 33 is provided on the inner side wall of the insertion groove 32, and the opening of the sliding groove 33 faces the hollow part of the nut. The slider 411 is slidably connected to the sliding groove 33. The sliding groove 33 includes an upper horizontal groove, a vertical groove and a lower horizontal groove that are slidably connected to the slider 411 in sequence. The upper horizontal groove and the lower horizontal groove are flush and parallel to each other, and the upper horizontal groove is located above the lower horizontal groove. The vertical groove is located between the upper horizontal groove and the lower horizontal groove, and its two vertical ends are respectively connected to the ends of the upper horizontal groove and the lower horizontal groove. When it is necessary to push the plug rod 43 to abut against the locking component 44, the operator first slides the slider 411 from the end of the upper horizontal groove away from the vertical groove into the vertical groove, and then moves the control lever 41 in the direction of compressing the return spring 45. During this process, the slider 411 slides along the top of the vertical groove to the connection between the vertical groove and the lower horizontal groove. At this time, the control lever 41 pushes the plug rod 43 down until the plug rod 43 abuts against the locking component 44, thereby making the locking end of the locking component 44 engage with the annular groove 114; thus completing the limiting of the limiting ring 31. Then the operator rotates the control lever 41, causing the control lever 41 to drive the slider 411 to slide to the end of the lower horizontal groove away from the vertical groove, thus completing the limiting of the control lever 41.

[0042] Reference Figure 2 and Figure 6 The limiting ring 31 has a horizontally arranged mounting groove 311, and the locking component 44 is disposed in the mounting groove 311. The end of the plug rod 43 away from the connecting block 42 extends through the inner bottom wall of the plug groove 32 into the mounting groove 311, and the end of the plug rod 43 that slides into the mounting groove 311 abuts against the locking component 44. The locking component 44 includes a movable block 441 disposed in the mounting groove 311 and slidably connected to the mounting groove 311, an abutment 442 disposed on the side of the movable block 441 near the plug rod 43, and a component fixedly connected to the movable block 441. A locking rod 443 is located on the side away from the abutment 442. Two symmetrically arranged guide rods 445 are fixedly connected in the mounting groove 311 of the limiting ring 31. The locking rod 443 and the abutment 442 are both located between the two guide rods 445. The guide rods 445 pass through the moving block 441 and are slidably connected to the moving block 441. Each guide rod 445 is fitted with a spring spring 444. One end of the spring spring 444 is fixedly connected to the side of the mounting groove 311 away from the insertion groove 32, and the other end is fixedly connected to the side of the moving block 441 near the locking rod 443. When the insertion rod 43 contacts the abutment 442, the end of the locking rod 443 away from the moving block 441 passes through the limiting ring 31 and extends outside the limiting ring 31. The end of the locking rod 443 extending outside the limiting ring 31 is inserted into the annular groove 114.

[0043] The abutment 442 includes a mounting base fixedly connected to the side of the moving block 441 away from the locking lever 443 and an abutment wheel rotatably connected to the mounting base. The end of the insertion rod 43 away from the connecting block 42 is provided with a rounded chamfer, and the rounded chamfer of the insertion rod 43 abuts against the abutment wheel, thereby reducing the friction when the insertion rod 43 contacts the abutment wheel. The end of the control lever 41 away from the connecting block 42 is fixedly connected to a grip block.

[0044] The implementation principle of a reducing fitting for a tee pipe according to an embodiment of this application is as follows: When the reducing fitting body 1 needs to be installed at the branch port of the tee pipe, two washers 512 are respectively fitted onto two limiting rings 511, and then the sealing ring 51 is inserted into the receiving groove 111 of the fixed flange 11. Then, the fixed flange 11 is made to fit with the connecting flange 12, and the sealing gasket 52 is made to abut between the fixed flange 11 and the connecting flange 12. Then, the screw is fastened into the fixing notch 112, and the nut is threadedly connected to the screw until the limiting ring 31 slides into the limiting groove 113. The operator slides slider 411 from the end of the upper horizontal groove away from the vertical groove into the vertical groove, and then moves control lever 41 towards the direction of compressing return spring 45. During this process, slider 411 slides along the top of the vertical groove to the connection between the vertical groove and the lower horizontal groove. At this time, control lever 41 pushes plug rod 43 down. When the rounded chamfer of plug rod 43 contacts the abutment wheel, the end of locking lever 443 away from moving block 441 extends through limit ring 31 to the outside of limit ring 31, and the end of locking lever 443 extending to the outside of limit ring 31 engages with annular groove 114, completing the limiting of limit ring 31. Then, the operator rotates control lever 41, causing control lever 41 to drive slider 411 to slide to the end of the lower horizontal groove away from the vertical groove, completing the limiting of control lever 41; thereby reducing the occurrence of loosening of reducing connector body 1 due to intermittent vibration.

[0045] When it is necessary to unlock the limit of the fixed flange 11, the operator moves and rotates the control lever 41 along the direction of the lower horizontal groove towards the vertical groove, so that the slider 411 slides to the connection between the lower horizontal groove and the vertical groove. At this time, under the reset action of the return spring 45, the slider 411 slides to the connection between the vertical groove and the upper horizontal groove. Under the reset action of the spring spring 444, the locking lever 443 retracts into the limit ring 31. Then the operator rotates the control lever 41 again, so that the slider 411 slides to the end of the upper horizontal groove away from the vertical groove, thus completing the limit of the limit ring 31. Then, the nut is rotated in the opposite direction to disengage the nut from the screw.

[0046] This application also discloses a method for installing a reducing fitting for a tee pipe, comprising the following steps: S1: Place the two gaskets 512 onto the two limit rings 511 respectively, then insert the sealing ring 51 into the receiving groove 111 of the fixed flange 11, then make the fixed flange 11 fit with the connecting flange 12, and make the sealing gasket 52 abut between the fixed flange 11 and the connecting flange 12. S2: Insert the screw into the fixing notch 112 and make the nut threadedly connected to the screw until the limiting ring 31 slides into the limiting groove 113; S3: By operating the control lever 41, the locking lever 443 is engaged with the annular groove 114 to complete the limiting of the limit ring 31.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A reducing fitting for a tee pipe, characterized in that: The device includes a reducing connector body (1) that is detachably connected to the branch port of a tee pipe. The reducing connector body (1) is fixedly connected to a fixed flange (11) near the port of the tee pipe. The branch port of the tee pipe is fixedly connected to a connecting flange (12) that matches the fixed flange (11). A connecting piece (2) is provided on the connecting flange (12). A fixing piece (3) connected to the connecting piece (2) is provided on the fixed flange (11). A limiting component (4) for limiting the fixing piece (3) on the fixed flange (11) is provided. When the fixing piece (3) abuts against the side of the fixed flange (11) away from the connecting flange (12), the limiting end of the limiting component (4) is connected to the fixed flange (11). One end of the fastener (3) is fixedly connected to a limiting ring (31) on its periphery. The side of the fixed flange (11) away from the connecting flange (12) is provided with a limiting groove (113) that matches the limiting ring (31). The periphery of the limiting groove (113) is provided with an annular groove (114). The limiting end of the limiting component (4) is inserted into the annular groove (114). The fixing member (3) has a plug-in groove (32) and the limiting component (4) includes a control rod (41) slidably connected in the plug-in groove (32), a connecting block (42) rotatably connected to the bottom end of the control rod (41), a plug-in rod (43) fixedly connected to the end of the connecting block (42) away from the control rod (41), and a locking component (44) disposed in the limiting ring (31) and abutting the end of the plug-in rod (43) away from the connecting block (42). A return spring (45) is sleeved on the plug-in rod (43). When the end of the plug-in rod (43) away from the connecting block (42) abuts the locking component (44), the plug-in rod (43) pushes the locking component (44) to move laterally, and the locking end of the locking component (44) passes through the limiting ring (31) and is plugged into the annular groove (114). A slider (411) is fixedly connected to the periphery of the control lever (41), and a U-shaped groove (33) is provided on the inner side wall of the insertion slot (32). The slider (411) is slidably connected to the groove (33).

2. A reducing fitting for a tee pipe according to claim 1, characterized in that: The connecting flange (12) has a connecting notch (121), and the connecting piece (2) is rotatably connected to the connecting notch (121) of the connecting flange (12). The fixing flange (11) has a fixing notch (112), which corresponds to and is connected to the corresponding connecting notch (121). The fixing notch (112) allows the connecting piece (2) to be snapped in.

3. A reducing fitting for a tee pipe according to claim 1, characterized in that: The limiting ring (31) has an installation groove (311) inside, and the locking component (44) is disposed in the installation groove (311). One end of the plug rod (43) slides into the installation groove (311) and abuts against the locking component (44). The locking component (44) includes a movable block (441) disposed in the installation groove (311) and slidably connected to the installation groove (311), an abutment (442) disposed on the side of the movable block (441) near the plug rod (43), and a component fixedly connected to the movable block (441). A locking rod (443) is located on the side away from the abutment (442). A guide rod (445) is fixedly connected to the mounting groove (311) of the limiting ring (31) and is slidably connected to the moving block (441). Each guide rod (445) is fitted with a spring spring (444). The abutment (442) abuts against the insertion rod (43). The locking rod (443) extends through the limiting ring (31) to the outside of the limiting ring (31) and is inserted into the annular groove (114).

4. A reducing fitting for a tee pipe according to claim 3, characterized in that: The abutment (442) includes a mounting base fixedly connected to the side of the moving block (441) away from the locking rod (443) and an abutment wheel rotatably connected to the mounting base. The end of the insertion rod (43) away from the connecting block (42) is provided with a rounded chamfer, and the rounded chamfer of the insertion rod (43) abuts against the abutment wheel.

5. A reducing fitting for a tee pipe according to claim 1, characterized in that: A sealing assembly (5) is provided between the fixed flange (11) and the connecting flange (12). The sealing assembly (5) includes a sealing ring (51) and a sealing gasket (52) fixedly connected to the outer ring side of the sealing ring (51). The sealing gasket (52) abuts between the fixed flange (11) and the connecting flange (12). A receiving groove (111) is provided on the side of the fixed flange (11) and the connecting flange (12) that are close to each other. The two receiving grooves (111) together form a receiving cavity that matches the contour of the sealing ring (51).

6. A reducing fitting for a tee pipe according to claim 5, characterized in that: The sealing ring (51) has a limit ring (511) on its top and bottom surfaces, and a washer (512) is fitted on each limit ring (511).

7. A method for installing a reducing fitting for a tee pipe according to any one of claims 3-4, characterized in that: Includes the following steps: S1: Fit the fixed flange (11) with the connecting flange (12) and connect the fastener (3) and the connector (2) until the limiting ring (31) slides into the limiting groove (113); S2: Press down the control lever (41) so that the plug rod (43) abuts against the abutment (442), the plug rod (43) pushes the locking lever (443) so that the end of the locking lever (443) away from the moving block (441) passes through the limiting ring (31) and extends to the outside of the limiting ring (31), and is plugged into the annular groove (114) to complete the limiting of the limiting ring (31); S3: Rotate the control lever (41) in the opposite direction to complete the limit of the control lever (41).

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