A device for preventing odor from a sewer pipe

Abstract

The utility model relates to a kind of water pipe water gate linkage stinkproof device. To solve the stinkproof water storage bay dry failure problem. It is that upper flange top vertical pipe section or top vertical pipe section is connected to diameter wall in the inside, the outer periphery of the located circle is less than the outer vertical semicircular pipe section of top vertical pipe section inner cavity by downward lateral shrinkage pipe section downward, diameter wall lower part two sides vertical end edge is connected to the inner vertical semicircular pipe of the lower part of outer vertical semicircular pipe section symmetry inwards transversely, the common outer periphery wall of outer vertical semicircular pipe section and inner vertical semicircular pipe is connected downward for forming the lower convex shape bottom sealing of lower upper turn-back type water bay channel;Diameter wall outer inner two sides concentric shaft type are respectively hinged to the linkage type water flush outer inner door of transverse sealing outer vertical semicircular pipe section inner cavity and downward buckling sealing inner vertical semicircular pipe upper mouth. It has the advantages of strong inhibition of water evaporation, will not cause water to fall not smooth and blockage, water seal long time effective.

Description

Technical Field

[0001] This invention relates to a water-cooled odor-blocking device, and more particularly to a water-cooled pipe valve-linked odor-blocking device. Background Technology

[0002] As a professional supplier and maintainer of public toilet equipment and handwashing facilities, the applicant frequently receives feedback regarding odor-blocking malfunctions in drainage pipes, such as floor drains, urinal drains, sink drains, and other drainage pipes. Currently, the most common odor-blocking method is water seal odor control. While water seals offer good odor control, they are prone to malfunction due to the seal drying out. The most common way to prevent this is by adding a damper to inhibit water evaporation. However, existing dampers often suffer from poor drainage or even blockages, meaning they often have insufficient opening and trap debris, affecting water flow. Therefore, there is an urgent need for a water-locked odor-blocking device that effectively inhibits water evaporation without causing drainage problems or blockages. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects of the prior art and provide a water valve linkage odor-blocking device for a downpipe. This device can effectively suppress the evaporation of sealed water without causing poor drainage or blockage.

[0004] To achieve the above objectives, the novel water gate linkage odor-blocking device for downpipes is characterized by the following: the top flange vertical pipe section or the top vertical pipe section extends downward through the downward lateral contraction pipe section to an outer vertical semicircular pipe section whose diameter wall is located on the inner side and whose outer circumference is smaller than the inner cavity of the top vertical pipe section; the two vertical ends of the lower part of the diameter wall extend inward laterally to an inner vertical semicircular pipe symmetrical to the lower part of the outer vertical semicircular pipe section; the common outer circumference wall of the outer vertical semicircular pipe section and the inner vertical semicircular pipe extends downward to a convex bottom seal for forming a bottom-up folding water bay; the outer and inner sides of the diameter wall are concentrically hinged to a linkage-type water flushing outer and inner gate that horizontally seals the inner cavity of the outer vertical semicircular pipe section and downwardly fastens the upper opening of the inner vertical semicircular pipe. In this way, when water flows down, the force of the water jet will push the outer door of the interlocking water jet downwards, and the inner door will inevitably open upwards in response. This allows the water to flow downwards through the open outer door, then upwards through the bottom-up reversing water trap, and finally out through the open inner door into the sewer or downpipe. Thus, the outer and inner doors of the interlocking water jet are simultaneously opened by the downward force and upward force, ensuring both opening speed and degree, ultimately guaranteeing smooth drainage and preventing blockages. When the drainage stops, because the inner door is lighter than the outer door, the interlocking doors, having lost their flushing force, will inevitably move upwards and downwards under their own weight until the inner door closes downwards to seal the top of the inner vertical semi-circular pipe and the outer door horizontally seals the middle of the outer vertical semi-circular pipe section, preventing the water trap below from easily evaporating upwards. Furthermore, before the water level in the odor-blocking bay drops to the lower end of the outer vertical semi-circular pipe section's diameter wall due to evaporation, the lower part of the outer vertical semi-circular pipe section's diameter wall can still maintain the odor-blocking function of the odor-blocking bay by separating the upstream and downstream sides. In particular, the inner and outer water-flushing gates are linked; if one gate is not opening smoothly, the other linked gate can still be opened normally by the water flow. Even more importantly, if both gates are not opening smoothly, the combined force of the water in the two linked gates can still ensure that both gates open normally, guaranteeing the proper opening and thus ensuring smooth water flow and preventing blockages. Therefore, this new design has the advantages of effectively suppressing water evaporation, significantly improving the odor-blocking performance of the water seal, and avoiding water flow obstruction and blockages.

[0005] As an optimization, the wall thickness of the top vertical pipe section or the top vertical pipe section of the upper flange is greater than or equal to the wall thickness of the downward contraction pipe section. A greater thickness facilitates installation and durability, while an equal thickness facilitates manufacturing. Alternatively, the wall thickness of the top vertical pipe section or the top vertical pipe section of the upper flange is greater than the wall thickness of the downward contraction pipe section, and it is equipped with external threads for extending the downpipe with a sealing ring, or fastening nuts with elastic sealing rings, and for threaded connection of the downpipe. External threads provide more reliable installation, and fastening nuts with elastic sealing rings ensure convenient and reliable sealing and fastening. The diameter of the circle containing the outer circumference of the outer vertical semicircular pipe section is less than or equal to the diameter of the lower vertical semicircular pipe section. The upper flange top vertical pipe section or the inner cavity diameter of the top vertical pipe section is 3 / 4, allowing the water overflowing from the upper opening of the inner vertical semicircular pipe to flow smoothly downwards; or the upper flange top vertical pipe section or the top vertical pipe section is connected downwards to a middle expansion pipe that is thin at both ends and thick in the middle. The vertical length of the middle expansion section of the middle expansion pipe is greater than the length from the top of the outer vertical semicircular pipe section to the bottom of the lower convex seal. The lower pipe section of the middle expansion pipe is used to extend downwards to connect to the lower drainage pipe section. This is beneficial for expanding the outer vertical semicircular pipe section and the inner vertical semicircular pipe, making the downward and upward return water flow smoother. The middle section of the expanded diameter of the middle expansion pipe is also conducive to the smooth downward flow of the downward and upward return water flow.

[0006] As an optimization, the outer diameter of the lower pipe section of the expansion pipe is equal to the outer diameter of the top vertical pipe section of the upper flange, while the outer diameter of the upper pipe section of the expansion pipe is greater than the outer diameter of the top vertical pipe section of the upper flange. This facilitates the modification of existing downpipelines.

[0007] As an optimization, the expansion pipe consists of upper and lower head sections and an expansion section. The expansion section consists of a thicker middle section and upper and lower flared diameter-changing sections. The upper and lower head sections are used for connecting pipes, and the upper and lower flared diameter-changing sections facilitate smooth flow.

[0008] As an optimization, upper and lower flared diameter reducing sections are provided with upper and lower flanges on the outer periphery between the upper and lower flared diameter reducing sections and the upper and lower head pipe sections, which facilitates a firm and reliable sealing connection; or, upper flanges are provided on the outer periphery between the upper flared diameter reducing section and the upper head pipe section, which facilitates a firm and reliable sealing connection upwards and provides space for downward installation and maintenance.

[0009] As an optimization, the top flange top vertical pipe section or the top vertical pipe section extends downward through the downward side contraction pipe section to the outer vertical semi-circular pipe section with the diameter wall located on the inside. The top vertical pipe section is provided with an upper flange at the upper end or a middle flange plate on the outer periphery of the middle section. The upper end of the middle expansion pipe section is provided with a top baffle plate on the outer periphery of the upper end. The inner periphery of the middle expansion pipe section is bolted to the top flange top vertical pipe section or the outer periphery of the top vertical pipe section.

[0010] An elastic sealing ring is provided between the top flange and the upper flange or middle flange of the top vertical pipe section. The lower pipe section of the middle expansion pipe is provided with external threads or with spaced concave or convex rings on the outer circumference, or the outer circumference is bare. This allows for convenient selection based on different working conditions.

[0011] As an optimization, the linked water-flushing outer and inner doors consist of an inner water-flushing door for sealing the inner cavity of the middle section of the outer vertical semi-circular pipe section and an inner water-flushing door for fastening the upper opening of the inner vertical semi-circular pipe, respectively, hinged to the outer and inner sides of the diameter wall via concentric semi-axles. The lower parts of the outer and inner water-flushing doors are fixedly connected by a downward-convex arc-shaped frame whose inner bottom is lower than the lower end of the diameter wall of the outer vertical semi-circular pipe section. This linkage mechanism of hinged inner and outer water-flushing doors ensures concentricity of the hinges regardless of the angle at which they are rotated, prevents lateral air leakage at the hinges, and improves resistance to the drop of the seal water level due to evaporation. In other words, as long as the seal water level does not drop below the diameter wall, the water seal remains effective. When the downward-convex arc-shaped frame is semi-circular, it maximizes both unobstructed flow and water seal performance.

[0012] As an optimization, the separate hinges consist of outer and inner arc-shaped half-shafts on the same circle on both the outer and inner sides of the diameter wall, and outer and inner arc-shaped half-shaft sleeves spaced apart from them. The base of the water-flushing outer door and the base of the water-flushing inner door are respectively provided with outer and inner sliding shafts that mate with the outer and inner arc-shaped half-shafts and their outer and inner arc-shaped half-shaft sleeves. This helps to ensure the opening degree of the linked water-flushing outer and inner doors.

[0013] As an optimization, the outer and inner water-flushing doors are symmetrical horizontal doors, which helps to increase the water seal height; or the base of the outer water-flushing door and the base of the inner water-flushing door are horizontally symmetrical, the outer water-flushing door is a horizontal door, and the inner water-flushing door is a downward-sloping door, which is more conducive to the opening and closing of the water-flushing door and the smooth flow of water.

[0014] As an optimization, the outer periphery of the water-flushing outer door in the horizontal state is fitted with a clearance between it and the inner cavity of the outer vertical semi-circular pipe section; when the water-flushing outer door is in the horizontal state, the bottom of the water-flushing inner door is pressed downward to seal the upper opening of the inner vertical semi-circular pipe. The two doors open in conjunction under water flushing to form a combined flushing force, significantly increasing the opening force. The two doors close in conjunction under the gravity difference, which is more conducive to slowing down the closing speed, thereby retaining as much water as possible in the water seal groove.

[0015] The core of this novel water gate linkage odor-blocking system consists of an inlet gate area with an additional front weak baffle gate distributed sequentially from upstream to downstream of the water flow; a water seal area divided into an upper inlet / outlet section and a bottom flow section by a diameter wall; and an outlet gate area with an additional rear strong baffle gate. This two-stage baffle design significantly enhances the ability to suppress water evaporation. The front weak baffle gate, aided by the impact of the downstream water flow, significantly increases the opening of the rear strong baffle gate, thereby strengthening anti-clogging performance. After the front and rear baffle gates are opened by the water flow, the inlet and outlet gates are opened, and only the water seal area exists in the waterway, allowing the flowing water to descend smoothly. When the water flow stops, the inlet and outlet gates reset under the gravity difference, thus blocking and sealing the inlet and outlet, thereby inhibiting and preventing the sealed water from evaporating into the upstream and downstream drain pipes. Furthermore, since the height of the diameter wall section that divides the upper part of the sealed water into the upper inlet and outlet section and the bottom water flow section is close to the radius of the circle containing the inner cavity of the upper inlet and outlet section, the water level of the sealed water is not lower than the diameter wall, which ensures that the water seal is effective and thus ensures that the water seal is effective for a long time.

[0016] After adopting the above technical solution, this new type of water gate linkage odor-blocking device for downpipeline has the advantages of not only strongly suppressing the evaporation of sealing water and significantly improving the odor-blocking performance of water seal, but also not causing poor downpipe flow or blockage, and ensuring the long-term effectiveness of water seal. Attached Figure Description

[0017] Figure 1 This is a side view of the first embodiment of the drain configuration of the drain pipe water gate linkage odor-blocking device of this utility model. Figure 2 This is a side view of the second embodiment of the urinal and washbasin drain water close-in configuration of the drain pipe water valve linkage odor-blocking device of this utility model. Figure 3 This is a side view of the third embodiment of the urinal and washbasin drain water close-in configuration of the drain pipe water valve linkage odor-blocking device of this utility model. Figure 4 This is a side view of the fourth embodiment of the vertical pipe drainage proximity configuration of the drainage pipe water gate linkage odor-blocking device of this utility model. Figure 5 This is a side view of the fifth embodiment of the vertical pipe remote connection configuration of the downpipe water gate linkage odor-blocking device of this utility model. Figure 6 This is a side view of the sixth implementation method of the drain configuration with a downward-sloping door and a water flushing inner door in the drain pipe of this utility model. Detailed Implementation

[0018] Example 1, as Figure 1As shown, the odor-blocking device for the downpipe of this utility model consists of an outer vertical semicircular pipe section 3 with a diameter wall 31 located on the inner side of the upper flange top vertical pipe section 1 (or top vertical pipe section) and a lower side contraction pipe section 2. The outer circumference of the outer vertical pipe section 3 is smaller than the inner cavity of the upper flange top vertical pipe section 1. The two vertical ends of the lower part of the diameter wall 31 extend inward and laterally to form an inner vertical semicircular pipe 4 symmetrical to the lower part of the outer vertical semicircular pipe section 3. The common outer circumference of the outer vertical semicircular pipe section 3 and the inner vertical semicircular pipe 4 extends downward to form a convex bottom seal 5 for forming a bottom-up folding water bay. The outer and inner sides of the middle part of the diameter wall 31 are concentrically hinged to the outer vertical semicircular pipe section 3 and the inner vertical semicircular pipe 4 respectively, forming a linkage-type water flushing outer and inner door 61 and 62. In this way, when water flows down, the force of the water jet will push the outer door of the interlocking water jet downwards, and the inner door will inevitably open upwards in response. This allows the water to flow downwards through the open outer door, then upwards through the bottom-up reversing water trap, and finally out through the open inner door into the sewer or downpipe. Thus, the outer and inner doors of the interlocking water jet are simultaneously opened by the downward force and upward force, ensuring both opening speed and degree, ultimately guaranteeing smooth drainage and preventing blockages. When the drainage stops, because the inner door is lighter than the outer door, the interlocking doors, having lost their flushing force, will inevitably move upwards and downwards under their own weight until the inner door closes downwards to seal the top of the inner vertical semi-circular pipe and the outer door horizontally seals the middle of the outer vertical semi-circular pipe section, preventing the water trap below from easily evaporating upwards. Furthermore, before the water level in the odor-blocking bay drops to the lower end of the outer vertical semi-circular pipe section's diameter wall due to evaporation, the lower part of the outer vertical semi-circular pipe section's diameter wall can still maintain the odor-blocking function of the odor-blocking bay by separating the upstream and downstream sides. In particular, the inner and outer water-flushing gates are linked; if one gate is not opening smoothly, the other linked gate can still be opened normally by the water flow. Even more importantly, if both gates are not opening smoothly, the combined force of the water in the two linked gates can still ensure that both gates open normally, guaranteeing the proper opening and thus ensuring smooth water flow and preventing blockages. Therefore, this new design has the advantages of effectively suppressing water evaporation, significantly improving the odor-blocking performance of the water seal, and avoiding water flow obstruction and blockages.

[0019] Specifically, the wall thickness of the top vertical pipe section 1 of the upper flange is equal to the wall thickness of the downward contraction pipe section 2. The diameter of the circle containing the outer circumference of the outer vertical semicircular pipe section 3 is less than or equal to 3 / 4 of the inner diameter of the top vertical pipe section 1 of the upper flange. The wall thickness of the top vertical pipe section 1 (or the top vertical pipe section) of the upper flange is greater than (or equal to) the wall thickness of the downward contraction pipe section 2, or the wall thickness of the top vertical pipe section or the top vertical pipe section is greater than the wall thickness of the downward contraction pipe section, and it is provided with external threads.

[0020] Specifically, the linked water-flushing outer and inner doors 61 and 62 are respectively hinged on the outer and inner sides of the diameter wall 31 via concentric outer and inner half-shafts. The outer door 61 is used to close the inner cavity of the middle part of the outer vertical semi-circular pipe section 3, and the inner door 62 is used to seal downwards at the upper opening of the inner vertical semi-circular pipe 4. The lower parts of the outer door 61 and the inner door 62 are fixedly connected by a downwardly convex arc-shaped frame 8 whose inner bottom is lower than the lower end of the diameter wall 31 of the outer vertical semi-circular pipe section 3. The downwardly convex arc-shaped frame 8 is a semi-circular downwardly convex arc-shaped frame 8. More specifically, the respectively hinged connection consists of outer and inner arc-shaped half-shafts 71 and 72 on the same circle on the outer and inner sides of the diameter wall 31, and outer and inner arc-shaped half-shaft sleeves 73 and 74 spaced apart from them. The base of the outer door 61 and the base of the inner door 62 are respectively provided with outer and inner sliding shafts 63 and 64 that fit with the outer and inner arc-shaped half-shafts 71 and 72 and their outer and inner arc-shaped half-shaft sleeves 73 and 74.

[0021] Specifically, the outer flushing door 61 and the inner flushing door 62 are symmetrical horizontal doors. Specifically, the outer periphery of the horizontally positioned outer flushing door 61 is fitted with a clearance fit within the inner cavity of the outer vertical semi-circular pipe section 3; when the outer flushing door 61 is horizontal, the lower part of the inner flushing door 62 is pressed downwards to seal the upper opening of the inner vertical semi-circular pipe 4. During installation, the upper flange top vertical pipe section 1 of this novel device is inserted into the drain outlet for the floor drain, and then sealed with an elastic sealing ring or adhesive.

[0022] Example 2, as Figure 2 As shown, the difference between the drain valve linkage odor-blocking device of this utility model and the above embodiment 1 is that the drains of the urinal and washbasin are configured close together. The wall thickness of the upper flange top vertical pipe section 1 is greater than the wall thickness of the lower side contraction pipe section 2, and it is provided with an external thread 11 for extending the drain pipe with a sealing ring; it can also be a fastening nut with a screw-on elastic sealing ring and a screw-on drain pipe.

[0023] Example 3, as Figure 3 As shown, the difference between this utility model's drainpipe water valve linkage odor-blocking device and the above-mentioned embodiment two is that the drainpipes of the urinal and washbasin are configured close together. A centrally expanded pipe 9, tapering at both ends and thicker in the middle, is connected downwards from the top vertical pipe section 1 of the upper flange. The vertical length of the centrally expanded section of the centrally expanded pipe 9 is greater than the length from the top of the outer vertical semi-circular pipe section 3 to the lower convex sealing end 5. The lower end pipe section of the centrally expanded pipe 9 is used to extend downwards to connect to the lower drainpipe. Specifically, the outer diameter of the lower end pipe section of the centrally expanded section is equal to the outer diameter of the top vertical pipe section 1 of the upper flange. The centrally expanded pipe 9 consists of upper and lower end pipe sections and a centrally expanded section. The centrally expanded section consists of a thicker middle section and upper and lower flared diameter-changing sections. More specifically, upper and lower flanges are provided on the outer periphery between the upper and lower flared diameter-changing sections and the upper and lower end pipe sections; alternatively, an upper flange can be provided on the outer periphery between the upper flared diameter-changing section and the upper end pipe section. Specifically, the outer diameter of the lower pipe section of the expansion pipe 9 is equal to the outer diameter of the top vertical pipe section 1 of the upper flange, and the outer diameter of the upper pipe section of the expansion pipe 9 is greater than the outer diameter of the top vertical pipe section 1 of the upper flange.

[0024] The top flange top vertical pipe section 1 extends downwards through the lower side-shrinking pipe section 2 to connect to the outer vertical semi-circular pipe section 3 with its diameter wall located on the inner side. Alternatively, the top vertical pipe section 1 can have an upper flange at its upper end. The upper end of the middle expansion pipe 9 has a top baffle plate on its outer circumference. The inner circumference of the middle expansion pipe 9's upper end pipe section is threaded to the top flange top vertical pipe section 1, or the outer circumference of the top vertical pipe section. Two elastic sealing rings 90 are provided between the top baffle plate and the upper flange of the top flange top vertical pipe section 1. The lower end pipe section of the middle expansion pipe 9 has external threads, or it can have spaced concave or convex rings on its outer circumference, or the outer circumference can be bare. Furthermore, an upper flange is provided on the outer circumference between the upper flared diameter section and the upper end pipe section.

[0025] Example 4, as Figure 4 As shown, the difference between the drain pipe water gate linkage odor-blocking device of this utility model and the above embodiment 2 is that the vertical pipe drain is configured in close proximity, and the upper flange top vertical pipe section is replaced by a middle flange plate 80 on the outer periphery of the middle of the top vertical pipe section 12.

[0026] Example 5, such as Figure 5 As shown, the difference between the drain pipe water gate linkage odor-blocking device of this utility model and the above embodiment four is that it is a remote configuration implementation of the vertical drain pipe. It is an additional installation of the middle expansion pipe 9 of embodiment three, and the upper and lower horn-shaped variable diameter parts and the upper and lower head pipe sections are provided with upper and lower flanges on the outer periphery.

[0027] Example 6, as Figure 6 As shown, the difference between the water gate linkage odor-blocking device of the drain pipe of this utility model and the above embodiment 1 is that the base of the outer water flushing door 61 and the base of the inner water flushing door 62 are horizontally symmetrical, the outer water flushing door 61 is a horizontal door, and the inner water flushing door 62 is a downward sloping door.

[0028] In summary, this novel water gate linkage odor-blocking device for downpipes has the advantages of effectively suppressing the evaporation of sealing water, significantly improving the odor-blocking performance of the water seal, and preventing water leakage and blockage, thus ensuring the long-term effectiveness of the water seal.

Claims

1. A water gate linkage odor-blocking device for a downpipe, characterized in that... The top flange top vertical pipe section or the top vertical pipe section extends downward through the downward side contraction pipe section to the outer vertical semi-circular pipe section whose diameter wall is located on the inner side and whose outer circumference is smaller than the inner cavity of the top vertical pipe section. The two vertical ends of the lower part of the diameter wall extend inward laterally to the inner vertical semi-circular pipe symmetrical to the lower part of the outer vertical semi-circular pipe section. The common outer circumference wall of the outer vertical semi-circular pipe section and the inner vertical semi-circular pipe extends downward to the convex bottom seal used to form the bottom-up folding water bay. The outer and inner sides of the diameter wall are concentrically hinged to the horizontal seal of the inner cavity of the outer vertical semi-circular pipe section and the downward snap seal of the upper opening of the inner vertical semi-circular pipe, respectively, forming a linkage type water-flushing outer and inner door.

2. The odor-blocking device for the downpipeline according to claim 1, characterized in that... The wall thickness of the top vertical pipe section or the top vertical pipe section of the upper flange is greater than or equal to the wall thickness of the downward contraction pipe section, or the wall thickness of the top vertical pipe section or the top vertical pipe section of the upper flange is greater than the wall thickness of the downward contraction pipe section, and is provided with external threads for extending the downpipe with a sealing ring or fastening nuts with elastic sealing rings and for threading downpipes; the diameter of the circle containing the outer circumference of the outer vertical semicircular pipe section is less than or equal to 3 / 4 of the inner diameter of the top vertical pipe section or the top vertical pipe section of the upper flange; or the top vertical pipe section or the top vertical pipe section of the upper flange is connected downwards to a middle expansion pipe that is thinner at both ends and thicker in the middle, the vertical length of the middle expansion section of the middle expansion pipe is greater than the length from the top of the outer vertical semicircular pipe section to the bottom of the lower convex seal, and the lower pipe section of the middle expansion pipe is used to extend the downpipe to the lower section.

3. The odor-blocking device for the downpipeline according to claim 2, characterized in that... The outer diameter of the lower pipe section of the expansion pipe is equal to the outer diameter of the top vertical pipe section of the upper flange or the top vertical pipe section, while the outer diameter of the upper pipe section of the expansion pipe is greater than the outer diameter of the top vertical pipe section of the upper flange or the top vertical pipe section.

4. The odor-blocking device for the downpipeline according to claim 2, characterized in that... The expansion pipe consists of upper and lower head pipe sections and an expansion section, which in turn consists of a thicker section and upper and lower flared diameter sections.

5. The odor-blocking device for the downpipeline according to claim 4, characterized in that... The upper and lower flared diameter sections are provided with upper and lower flanges on their outer periphery between the upper and lower flared diameter sections and the upper head pipe sections, or the upper flared diameter section of the upper and lower flared diameter sections is provided with an upper flange on its outer periphery between the upper flared diameter section and the upper head pipe section.

6. The odor-blocking device for the downpipeline according to claim 2, characterized in that... The top flange top vertical pipe section or the top vertical pipe section extends downward through the lower side contraction pipe section to the outer vertical semi-circular pipe section with the diameter wall located on the inner side. The top vertical pipe section is provided with an upper flange at the upper end or a middle flange plate on the outer periphery of the middle part; the upper end of the middle expansion pipe section is provided with a top baffle plate on the outer periphery of the upper end. The inner periphery of the middle expansion pipe section is bolted to the top flange top vertical pipe section or the outer periphery of the top vertical pipe section. An elastic sealing ring is provided between the top flange and the upper flange or middle flange of the top vertical pipe section. The lower pipe section of the middle expansion pipe is provided with external threads or with spaced concave or convex rings on the outer circumference, or the outer circumference is bare.

7. The odor-blocking device for the downpipeline according to claim 1, characterized in that... The linked water-flushing outer and inner doors are respectively hinged on the outer and inner sides of the diameter wall via concentric half-shafts for sealing the inner cavity of the middle part of the outer vertical semi-circular pipe section and for fastening the upper opening of the inner vertical semi-circular pipe. The lower parts of the water-flushing outer door and the water-flushing inner door are fixedly connected by a downward convex arc-shaped frame whose inner bottom is lower than the lower end of the diameter wall of the outer vertical semi-circular pipe section. The downward convex arc-shaped frame is a semi-circular downward convex arc-shaped frame.

8. The odor-blocking device for the downpipeline according to claim 7, characterized in that... The respective hinges are provided on the outer and inner sides of the diameter wall, respectively, with an outer inner arc half-shaft on the same circle and an outer inner arc half-shaft sleeve spaced apart from it. The base of the water-flushing outer door and the base of the water-flushing inner door are respectively provided with an outer inner sliding shaft that fits with the outer inner arc half-shaft and its outer inner arc half-shaft sleeve.

9. The odor-blocking device for the downpipeline according to claim 8, characterized in that... The outer and inner water-flushing doors are symmetrical horizontal doors; or the base of the outer water-flushing door is horizontally symmetrical to the base of the inner water-flushing door, the outer water-flushing door is a horizontal door, and the inner water-flushing door is a downward-sloping door.

10. The odor-blocking device for the downpipeline water gate according to claim 9, characterized in that... The outer periphery of the water-flushing outer door in the horizontal state is fitted with the inner cavity of the outer vertical semi-circular pipe section with a clearance; when the water-flushing outer door is in the horizontal state, the bottom of the water-flushing inner door is pressed downward to seal the upper opening of the inner vertical semi-circular pipe.

Images