Overflow device for preventing return of sewage and wastewater of low floor of residence

Abstract

The invention relates to the field of residence sewers, and discloses an overflow device for preventing return of sewage and wastewater of residence low floors, which comprises a sewer main pipe and a water return prevention component arranged between the sewer main pipe and an indoor drainage end, the water return prevention component comprises an indoor pipeline connected with the indoor drainage end, a blow-off pipeline with the output end arranged outdoors, a connecting pipeline connected with a sewer main pipe and a connecting valve set arranged among the indoor pipeline, the blow-off pipeline and the connecting pipeline, and a trigger assembly is arranged on the connecting pipeline. The connecting valve group is located above the triggering assembly, the connecting valve group and the triggering assembly are connected through a connecting rod group, the connecting valve group is arranged to be switched between a first state and a second state, the connecting valve group in the first state is used for communicating an indoor pipeline with a connecting pipeline, and the connecting valve group in the second state is used for communicating the connecting pipeline with a blow-off pipeline; and the trigger assembly is matched with the connecting rod group to switch the connecting valve group of the blocked floor from the state I to the state II when the sewer main pipe is blocked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of residential sewer, in particular to the technical field of residential sewer anti-backwater, and specifically to an overflow device for preventing backwater of residential low-floor sewage. BACKGROUND

[0002] Sewer anti-backwater is one of the important factors affecting residents' life. Specifically, it refers to the clogging of the sewer of a residence, which causes the sewage of high floors to be unable to drain and preferentially backflow into the house of the floor closest to the clogging, resulting in indoor flooding, pollution and odor. To solve this problem, the existing technology generally installs an anti-backwater check valve in the house. The anti-backwater check valve is also known as a backflow prevention valve or a non-return valve. It automatically closes and blocks the backflow of sewage when backwater occurs.

[0003] For example, the Chinese utility model patent with the publication number CN213271158U discloses a kitchen anti-backwater check valve. It adds a valve cavity with an opening on the top to the existing anti-backwater check valve, and a valve cover is screwed on the opening of the valve cavity. A sealing ring is arranged on the valve cover for sealing. When the valve body is cleaned or internal parts are replaced, the valve cover only needs to be opened. Although this method achieves the purpose of facilitating the maintenance of the anti-backwater check valve, it still has the same shortcomings as the existing anti-backwater check valve. Specifically, on the one hand, it can only prevent backflow. If the residents of high floors are unaware of the clogging, they will continue to drain, and the sewage in the sewer will accumulate more and more, causing more floors' anti-backwater check valves to be triggered. After the maintenance personnel arrive, they need to check one house at a time to find the clogging position for maintenance, which is very inconvenient. On the other hand, the drainage of the floors above the clogging is affected before the clogging problem is solved, i.e., the normal life is affected.

[0004] Based on the above problems, the present application provides an overflow device for preventing backwater of residential low-floor sewage. SUMMARY

[0005] To solve the problems mentioned in the background, the present application provides an overflow device for preventing backwater of residential low-floor sewage.

[0006] To achieve the above technical purposes, the technical solutions adopted by the present application are as follows.

[0007] An overflow device for preventing sewage and wastewater from backflowing from the lower floors of a residential building comprises a sewer main and a backflow prevention member disposed between the sewer main and an indoor drainage end. The backflow prevention member comprises an indoor pipe connected to the indoor drainage end, a sewage pipe having an output end disposed outdoors, and a connecting pipe connected to the sewer main. A connecting valve group is disposed between the indoor pipe, the connecting pipe, and the sewage pipe. A trigger assembly is disposed on the connecting pipe and is located above the connecting pipe. The connecting valve group is located above the trigger assembly and the two are connected by a connecting rod group.

[0008] The connecting valve group is configured to switch between state one and state two. When the connecting valve group is in state one, the connecting valve group is used to connect the indoor pipe with the connecting pipe. When the connecting valve group is in state two, the connecting valve group is used to connect the connecting pipe with the sewage pipe.

[0009] The trigger assembly cooperates with the connecting rod assembly to switch the connecting valve assembly on the blocked floor from state one to state two when the sewer main is blocked.

[0010] As a further improvement and optimization of the present invention, the connecting valve group includes a valve housing, which is in the shape of a horizontally arranged cylindrical shell, an upper connecting pipe is provided at the highest point of the outer circular surface of the valve housing, and the upper end of the upper connecting pipe is connected to the indoor pipeline, a lower connecting pipe is provided at the lowest point of the outer circular surface of the valve housing, and the lower connecting pipe is connected to the connecting pipe, a side connecting pipe is provided on one side of the outer circular surface of the valve housing, and the end of the side connecting pipe is connected to the sewage pipe, and the central angle between the side connecting pipe and the upper connecting pipe is ninety degrees;

[0011] A valve core is rotatably mounted in the valve housing. The valve hole provided on the valve core consists of a through hole radially penetrating the outer circumferential surface of the valve core and a side hole radially provided on the outer circumferential surface of the valve core and connected to the through hole. The axis of the side hole is perpendicular to the axis of the through hole. Initially, the side hole is blocked by the inner wall of the valve housing, and the through hole realizes the communication between the upper connecting pipe and the lower connecting pipe.

[0012] A valve shaft extends from the end of the valve core, and a coil spring is provided at the connection between the valve shaft and the valve housing. When the connection valve group is in state one, the coil spring is in a compressed state.

[0013] As a further improvement and optimization of the present invention, a side support is provided at one end of the valve housing, and an annular groove is provided on the end surface of the side support. The end of the valve shaft passes through the annular groove and extends to the outside of the side support. The end surface of the side support is also provided with a side groove and an arc groove connected to the annular groove, and the arc groove and the side groove are connected through a connecting port.

[0014] As a further improvement and optimization of the present application, a fixing ring is arranged in the annular groove, the fixing ring is connected with the valve shaft, the outer circumferential surface of the fixing ring is provided with a protrusion, and the protrusion is located in the arc groove;

[0015] A sliding block is arranged in the side groove and slides in the vertical direction, one end of the sliding block is provided with a guide rod, the other end is provided with a clamping jaw, the tail end of the clamping jaw is located in the arc groove through the connecting port, the upper end of the guide rod extends out of the side support, and a spring is arranged on the side of the sliding block away from the connecting port.

[0016] As a further improvement and optimization of the present application, when the connecting valve group is switched from state one to state two, the rotation direction of the valve core is named as a trigger rotation direction;

[0017] Initially, the connecting valve group is in state one, the tail end of the clamping jaw is in contact with the protrusion, and the clamping jaw is located in front of the protrusion along the trigger rotation direction.

[0018] As a further improvement and optimization of the present application, the side of the clamping jaw away from the protrusion is provided with an inclined surface along the trigger rotation direction, and initially, the distance between the inclined surface and the protrusion increases in the sliding direction of the sliding block and in the direction from the annular groove to the side groove.

[0019] As a further improvement and optimization of the present application, one end of the valve shaft extending out of the side support is provided with a knob.

[0020] As a further improvement and optimization of the present application, the trigger assembly comprises a barrel arranged vertically and a float located in the barrel;

[0021] A bottom hole is coaxially arranged at the bottom of the barrel, a connecting protrusion is arranged at the lower hole of the bottom hole, the connecting protrusion is connected with a fixing hole arranged on the connecting pipeline, an inner protruding ring is arranged at the upper hole of the bottom hole, and a plurality of side communication holes are arranged on the outer circumferential surface of the inner protruding ring in the circumferential direction.

[0022] As a further improvement and optimization of the present application, the connecting rod group comprises a top rod vertically arranged at the upper end of the float, and the upper end of the top rod extends out of the barrel and is provided with a supporting groove;

[0023] The upper end of the guide rod is provided with an insertion slot, the insertion slot is provided with a protruding pin,

[0024] The connecting rod group further comprises a swing rod hingedly connected with the side support, the tail end of the swing rod passes through the insertion slot and the supporting groove, and initially, the supporting groove supports the swing rod and the upper surface of the swing rod is in contact with the lower surface of the protruding pin.

[0025] As a further improvement and optimization of the application, the upper end of the float plug is provided with an upper sealing plug, the upper end of the barrel shell is open and provided with a barrel cover, the lower end surface of the barrel cover is provided with a lower sealing block, the upper end surface of the barrel cover is provided with a fixing block, and the lower sealing block and the fixing block are both provided with a avoiding hole for avoiding the ejector rod;

[0026] The outer surface of the fixing block is provided with a side connecting nozzle, and the lower sealing block and the fixing block are provided with a connecting channel for realizing the communication between the side connecting nozzle and the barrel shell.

[0027] The side connecting nozzle and the sewage pipeline are communicated through the exhaust pipeline.

[0028] When the upper sealing plug is in contact with the lower sealing block due to the upward movement of the float plug, the lower hole of the connecting channel is blocked by the upper sealing plug.

[0029] Compared with the prior art, the application has the following beneficial effects:

[0030] I. During normal use, the connecting valve group is in state one, so that the indoor pipeline is communicated with the connecting pipeline, at this time, the indoor sewage and wastewater enter the main sewer pipe through the indoor pipeline, the connecting valve group in state one, the connecting pipeline, and finally are discharged through the main sewer pipe.

[0031] When a certain floor is blocked, the floors below the blocked floor are normal and are not described here, and the drainage of the floors above the blocked floor is as follows: after the domestic sewage reaches the blocked position, it will backflow into the connecting pipeline of the blocked floor, since the connecting valve group is located above the trigger assembly, the domestic sewage has filled the trigger assembly before backflowing into the connecting valve group, so that the connecting valve group is switched to state two, so that the connecting pipeline is communicated with the sewage pipeline, and thereafter, the domestic sewage is discharged through the main sewer pipe, the connecting pipeline of the blocked floor, the connecting valve group in state two, and the sewage pipeline.

[0032] II. During the process that the trigger assembly is triggered and the float plug moves upward, the gas in the barrel shell is discharged through the connecting channel, the exhaust pipeline and the sewage pipeline, which can make the floating upward movement of the float plug more stable and smooth, improve the triggering sensitivity, and avoid the leakage of the foul gas of the sewer.

[0033] When the upper sealing plug is in contact with the lower sealing block due to the upward movement of the float plug, the lower hole of the connecting channel is blocked by the upper sealing plug, and the technical advantage is that the garbage backflowing with the domestic sewage can prevent the connecting channel and the exhaust pipeline from being blocked, thereby affecting the next use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a structural diagram of the anti-water backflow component;

[0036] Figure 3 It is a cross-sectional view of the connecting pipe, the trigger assembly and the connecting rod assembly;

[0037] Figure 4 is a cross-sectional view of the trigger assembly;

[0038] Figure 5 Schematic diagram of the structure of the connected valve group Figure 1 ;

[0039] Figure 6 Schematic diagram of the structure of the connected valve group Figure 2 ;

[0040] Figure 7 is a schematic diagram of the side support;

[0041] Figure 8 Partial diagram of connecting valve group Figure 1 ;

[0042] Figure 9 Partial diagram of connecting valve group Figure 2 .

[0043] The reference numerals in the accompanying drawings are:

[0044] 100, sewer main; 200, anti-backflow component; 201, indoor pipe; 202, connecting pipe; 203, sewage pipe; 204, exhaust pipe; 205, connecting valve group; 206, trigger assembly; 2061, cylinder shell; 2062, connecting protrusion; 2063, inner protrusion ring; 2064, side connecting hole; 2065, floating plug; 2066, upper sealing plug; 2067, side connecting nozzle; 2068, connecting channel; 2069, lower sealing block; 207, connecting rod group; 2071, Push rod; 2072, rocker arm; 208, valve housing; 2081, upper connecting pipe; 2082, lower connecting pipe; 2083, side connecting pipe; 209, side support; 2091, ring groove; 2092, arc groove; 2093, side groove; 210, valve shaft; 211, valve core; 2111, valve hole; 212, retaining ring; 2121, bump; 213, slider; 2131, claw; 214, spring; 215, guide rod; 2151, slot; 2152, protruding pin; 216, knob; 217, coil spring. DETAILED DESCRIPTION

[0045] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0046] Example 1

[0047] Reference Figures 1-9 , an overflow device for preventing sewage and waste water from flowing back on the lower floors of a residential building, comprising a sewer main 100 and an anti-backflow component 200 arranged between the sewer main 100 and an indoor drainage end (such as kitchen drainage, bathroom drainage, etc.); it should be noted that when in use, the domestic sewage and waste water discharged from the indoor drainage end enters the sewer main 100 through the anti-backflow component 200, and the domestic sewage and waste gas on different floors are uniformly discharged through the sewer main 100. This can be achieved with the existing technology and will not be elaborated on. It should be noted that an anti-backflow component 200 is arranged between each residential floor and the sewer main 100.

[0048] Reference Figure 2 The anti-backflow component 200 includes an indoor pipe 201 connected to the indoor drainage end, a sewage pipe 203 with the output end set outdoors, and a connecting pipe 202 connected to the sewer main 100. A connecting valve group 205 is provided between the indoor pipe 201, the connecting pipe 202 and the sewage pipe 203. A trigger component 206 is provided on the connecting pipe 202 and the trigger component 206 is located above the connecting pipe 202. The connecting valve group 205 is located above the trigger component 206 and the two are connected by a connecting rod group 207.

[0049] The connecting valve group 205 is configured to switch between state 1 and state 2. Specifically:

[0050] When the connecting valve group 205 is in state 1, the connecting valve group 205 is used to connect the indoor pipe 201 with the connecting pipe 202. At this time, indoor sewage and wastewater enter the sewer main 100 through the indoor pipe 201, the connecting valve group 205 in state 1, and the connecting pipe 202, and are finally discharged through the sewer main 100.

[0051] When the sewer main pipe 100 is blocked, the floor above and closest to the blocked position is named as the blocked floor, and the sewage of other floors can be normally discharged into the sewer main pipe 100. Due to the blockage of the sewer main pipe 100, the sewage of the floors above the blocked floor flows back to the connecting pipe 202 of the blocked floor. Since the connecting valve group 205 is above the triggering assembly 206, the sewage has filled the triggering assembly 206 before flowing back into the connecting valve group 205, so that the triggering assembly 206 is triggered, and the connecting valve group 205 is switched to state two through the cooperation with the connecting rod group 207, so as to make the connecting pipe 202 communicate with the sewage pipe 203. At this time, the sewage is discharged through the sewer main pipe 100, the connecting pipe 202 of the blocked floor, the connecting valve group 205 in state two, and the sewage pipe 203. The technical advantage is that on the one hand, the sewage of the floors above the blocked floor can be normally discharged, that is, the normal life is not affected, and on the other hand, the maintenance personnel can directly know the position of the blockage between which two floors by observing the drainage of the sewage pipe 203 of each floor, so that the maintenance is more convenient.

[0052] Connecting valve group 205:

[0053] Referring to Figures 5-9 The connecting valve group 205 includes a valve shell 208 which is horizontally arranged in a cylindrical shell shape. The outer circular surface of the valve shell 208 is provided with an upper connecting pipe 2081 at the highest point, and the upper end of the upper connecting pipe 2081 is connected with the indoor pipe 201. The outer circular surface of the valve shell 208 is provided with a lower connecting pipe 2082 at the lowest point, and the lower connecting pipe 2082 is connected with the connecting pipe 202. One side of the outer circular surface of the valve shell 208 is provided with a side connecting pipe 2083, and the end of the side connecting pipe 2083 is connected with the sewage pipe 203. The central angle between the side connecting pipe 2083 and the upper connecting pipe 2081 is ninety degrees.

[0054] A valve core 211 is rotatably installed in the valve shell 208. A valve hole 2111 provided on the valve core 211 is formed by a through hole penetrating the outer circular surface of the valve core 211 in the radial direction and a side hole penetrating the outer circular surface of the valve core 211 in the radial direction and communicating with the through hole. The axis of the side hole is perpendicular to the axis of the through hole. Initially, the side hole is blocked by the inner wall of the valve shell 208, and the through hole realizes the communication between the upper connecting pipe 2081 and the lower connecting pipe 2082. Therefore, the connecting valve group 205 is in state one. When the valve core 211 rotates by ninety degrees, one opening of the through hole is blocked by the inner wall of the valve shell 208, and the side hole realizes the communication between the lower connecting pipe 2082 and the side connecting pipe 2083 in cooperation with the through hole. Therefore, the connecting valve group 205 is in state two. In addition, in order to facilitate the description in the following, the rotation direction of the valve core 211 from state one to state two is named as the triggering rotation direction.

[0055] A valve shaft 210 extends from the end of the valve core 211 , and a coil spring 217 is provided at the connection between the valve shaft 210 and the valve housing 208 . When the connection valve group 205 is in state one, the coil spring 217 is in a compressed state.

[0056] A side support 209 is provided at one end of the valve housing 208 , and an annular groove 2091 is provided on the end face of the side support 209 . The end of the valve shaft 210 passes through the annular groove 2091 , that is, a through hole is provided at the bottom of the annular groove 2091 for avoiding the valve shaft 210 .

[0057] The end surface of the side support 209 is further provided with a side groove 2093 and an arc groove 2092 communicating with the annular groove 2091 , and the arc groove 2092 and the side groove 2093 are communicated with each other through a connecting port.

[0058] A fixing ring 212 is provided in the annular groove 2091 . The fixing ring 212 is connected to the valve shaft 210 . A protrusion 2121 is provided on the outer circumferential surface of the fixing ring 212 . The protrusion 2121 is located in the arc groove 2092 .

[0059] A slider 213 is provided in the side groove 2093 for sliding in the vertical direction. A guide rod 215 is provided at one end of the slider 213 and a claw 2131 is provided at the other end. The end of the claw 2131 passes through the connecting port and is located in the arc groove 2092. The upper end of the guide rod 215 extends out of the side support 209, and a spring 214 is provided on the side of the slider 213 facing away from the connecting port.

[0060] Initially, the connecting valve assembly 205 is in state 1, the end of the claw 2131 contacts the protrusion 2121 and the claw 2131 is located right in front of the protrusion 2121 along the trigger rotation direction, so the coil spring 217 cannot release the elastic force.

[0061] The claw 2131 is provided with an inclined surface on one side thereof along the triggering rotation direction and away from the protrusion 2121 . Initially, the distance between the inclined surface and the protrusion 2121 increases along the sliding direction of the slider 213 and from the annular groove 2091 to the side groove 2093 .

[0062] In a preferred embodiment, a knob 216 is further provided at one end of the valve shaft 210 extending out of the side support 209 .

[0063] Trigger assembly 206 and connecting rod assembly 207:

[0064] Reference Figure 3 and Figure 4 The trigger assembly 206 includes a vertically arranged cylindrical shell 2061 and a float 2065 located in the cylindrical shell 2061.

[0065] A bottom hole is coaxially provided at the bottom of the cylindrical shell 2061, and a connecting protrusion 2062 is provided at the lower opening of the bottom hole. The connecting protrusion 2062 is connected to the fixed hole provided on the connecting pipe 202. An inner convex ring 2063 is provided at the upper opening of the bottom hole, and a plurality of side connecting holes 2064 are arranged in an array along the circumferential direction on the outer circular surface of the inner convex ring 2063.

[0066] The buoy 2065 can float on the water surface, which is achievable with existing technology and will not be described in detail.

[0067] Reference Figures 3-5 The connecting rod group 207 includes a top rod 2071 vertically arranged at the upper end of the float 2065, and the upper end of the top rod 2071 extends out of the cylinder shell 2061 and is provided with a bracket.

[0068] The connecting rod assembly 207 further includes a rocker arm 2072 hingedly connected to the side support 209 .

[0069] A slot 2151 is provided at the upper end of the guide rod 215 , and a protruding pin 2152 is provided in the slot 2151 .

[0070] The end of the rocker arm 2072 passes through the slot 2151 and rests in the bracket, that is, the rocker arm 2072 is supported by the bracket and the upper surface of the rocker arm 2072 contacts the lower surface of the protruding pin 2152.

[0071] Working principle of embodiment 1:

[0072] When the connecting valve group 205 is in state 1 and is not blocked, the connecting valve group 205 is used to connect the indoor pipe 201 with the connecting pipe 202. At this time, indoor sewage and wastewater enter the sewer main 100 through the indoor pipe 201, the connecting valve group 205 in state 1, and the connecting pipe 202, and are finally discharged through the sewer main 100.

[0073] When a floor is blocked, the floors below the blocked floor are normal and will not be described in detail. The drainage conditions of the floors above the blocked floor are as follows:

[0074] When the domestic sewage reaches the blockage position, it will flow back into the connecting pipe 202 on the blocked floor. Since the connecting valve group 205 is located above the trigger assembly 206, the domestic sewage has already filled the trigger assembly 206 before it flows back into the connecting valve group 205. Specifically, the float 2065 moves upward, the top rod 2071 moves upward, and the swing rod 2072 swings upward, thereby causing the guide rod 215 and the slider 213 to move upward. The claw 2131 removes the restriction on the protrusion 2121 and the fixing ring 212, and the coil spring 217 releases its elastic force, causing the valve core 211 and finally the connecting valve group 205 to switch to state two.

[0075] Domestic sewage is discharged through the sewer main pipe 100, the connecting pipe 202 of the blocked floor, the connecting valve group 205 in state two, and the sewage pipe 203.

[0076] Embodiment two

[0077] In order to improve the triggering sensitivity, embodiment two is proposed.

[0078] Specifically, referring to Figure 2 With Figure 4 The upper end of the float plug 2065 is provided with an upper blocking plug 2066, the upper end of the barrel shell 2061 is open and provided with a barrel cover, the lower end surface of the barrel cover is provided with a lower blocking block 2069, and the upper end surface of the barrel cover is provided with a fixing block. The lower blocking block 2069 and the fixing block are both provided with avoiding holes for avoiding the top rod 2071.

[0079] The outer surface of the fixing block is provided with a side connecting nozzle 2067, and the lower blocking block 2069 and the fixing block are provided with a connecting channel 2068 for realizing the communication between the side connecting nozzle 2067 and the barrel shell 2061.

[0080] The side connecting nozzle 2067 and the sewage pipe 203 are communicated through the exhaust pipe 204.

[0081] Working principle of embodiment two:

[0082] In the process of triggering the trigger assembly 206 to move the float plug 2065 upward, the gas in the barrel shell 2061 is discharged through the connecting channel 2068, the exhaust pipe 204, and the sewage pipe 203, which can make the floating upward movement of the float plug 2065 more stable and smooth, and can also avoid the leakage of the foul gas of the sewer;

[0083] When the float plug 2065 moves upward and the upper blocking plug 2066 and the lower blocking block 2069 abut, the upper blocking plug 2066 blocks the lower hole of the connecting channel 2068. The technical advantage is that the garbage flowing back with domestic sewage can block the connecting channel 2068 and the exhaust pipe 204.

[0084] Further, after the maintenance personnel repair the blockage, the valve shaft 210 can be reversely rotated through the knob 216. Under the guidance of the inclined surface, the claw 2131 restores the restriction on the protrusion 2121, and the connecting valve group 205 is switched to state one.

[0085] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An overflow device for preventing sewage and wastewater from flowing back on the lower floors of a residential building, comprising a sewer main and an anti-backflow member arranged between the sewer main and the indoor drainage end, characterized in that: The anti-backflow component includes an indoor pipe connected to the indoor drainage end, a sewage pipe with an output end set outdoors, and a connecting pipe connected to the sewer main pipe. A connecting valve group is provided between the indoor pipe, the connecting pipe, and the sewage pipe. A trigger assembly is provided on the connecting pipe and the trigger assembly is located above the connecting pipe. The connecting valve group is located above the trigger assembly and the two are connected by a connecting rod group. The connecting valve group is configured to switch between state one and state two. When the connecting valve group is in state one, the connecting valve group is used to connect the indoor pipe with the connecting pipe. When the connecting valve group is in state two, the connecting valve group is used to connect the connecting pipe with the sewage pipe. The trigger assembly cooperates with the connecting rod assembly to switch the connecting valve assembly on the blocked floor from state one to state two when the sewer main is blocked.

2. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 1, characterized in that: The connecting valve group includes a valve housing, which is in the shape of a horizontally arranged cylindrical shell. An upper connecting pipe is provided at the highest point of the outer circular surface of the valve housing, and the upper end of the upper connecting pipe is connected to the indoor pipeline. A lower connecting pipe is provided at the lowest point of the outer circular surface of the valve housing, and the lower connecting pipe is connected to the connecting pipeline. A side connecting pipe is provided on one side of the outer circular surface of the valve housing, and the end of the side connecting pipe is connected to the sewage pipe. The central angle between the side connecting pipe and the upper connecting pipe is 90 degrees. A valve core is rotatably mounted in the valve housing. The valve hole provided on the valve core consists of a through hole radially penetrating the outer circumferential surface of the valve core and a side hole radially provided on the outer circumferential surface of the valve core and connected to the through hole. The axis of the side hole is perpendicular to the axis of the through hole. Initially, the side hole is blocked by the inner wall of the valve housing, and the through hole realizes the communication between the upper connecting pipe and the lower connecting pipe. A valve shaft extends from the end of the valve core, and a coil spring is provided at the connection between the valve shaft and the valve housing. When the connection valve group is in state one, the coil spring is in a compressed state.

3. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 2, characterized in that: A side support is provided at one end of the valve housing, and an annular groove is provided on the end surface of the side support. The end of the valve shaft passes through the annular groove and extends to the outside of the side support. The end surface of the side support is also provided with a side groove and an arc groove connected to the annular groove. The arc groove and the side groove are connected through a connecting port.

4. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 3, characterized in that: A fixing ring is provided in the annular groove, the fixing ring is connected to the valve shaft, and a convex block is provided on the outer circumference of the fixing ring, and the convex block is located in the arc groove; A slider is provided in the side groove for sliding in the vertical direction, a guide rod is provided at one end of the slider and a claw is provided at the other end, the end of the claw is located in the arc groove after passing through the connecting port, the upper end of the guide rod extends out of the side support, and a spring is provided on the side of the slider away from the connecting port.

5. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 4, characterized in that: When the connecting valve group switches from state 1 to state 2, the rotation direction of the valve core is named as the trigger rotation direction; Initially, the connecting valve group is in state 1, the end of the claw contacts the protrusion and the claw is located right in front of the protrusion along the triggering rotation direction.

6. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 5, characterized in that: The claw is provided with an inclined surface on one side along the triggering rotation direction and away from the protrusion. Initially, the distance between the inclined surface and the protrusion increases along the sliding direction of the slider and from the annular groove to the side groove.

7. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 3, characterized in that: A knob is provided on one end of the valve shaft extending out of the side support.

8. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 5, characterized in that: The trigger assembly includes a vertically arranged cylindrical shell and a floating plug located in the cylindrical shell; A bottom hole is coaxially provided at the bottom of the cylindrical shell, a connecting protrusion is provided at the lower opening of the bottom hole, the connecting protrusion is connected to the fixing hole provided on the connecting pipe, an inner convex ring is provided at the upper opening of the bottom hole, and a plurality of side connecting holes are arranged in an array on the outer circular surface of the inner convex ring along the circumferential direction.

9. The overflow device for preventing sewage and wastewater from flowing back from the lower floors of a residential building according to claim 8, characterized in that: The connecting rod group includes a top rod vertically arranged at the upper end of the float, the upper end of the top rod extends out of the cylinder shell and is provided with a bracket; The upper end of the guide rod is provided with a slot, and a protruding pin is provided in the slot. The connecting rod group also includes a swing rod hingedly connected to the side support, the end of the swing rod passes through the slot and the bracket, and initially, the bracket supports the swing rod and the upper surface of the swing rod contacts the lower surface of the protruding pin.

10. The overflow device for preventing sewage and wastewater from flowing back from lower floors of a residential building according to claim 8, characterized in that: The upper end of the float is provided with an upper sealing plug, the upper end of the cylinder shell is open and provided with a cylinder cover, the lower end surface of the cylinder cover is provided with a lower sealing block, the upper end surface of the cylinder cover is provided with a fixing block, and the lower sealing block and the fixing block are both provided with avoidance holes for avoiding the ejector rod; The outer surface of the fixing block is provided with a side connection nozzle, and the lower blocking block and the fixing block are provided with a connection channel for achieving communication between the side connection nozzle and the cylinder shell; The side connection nozzle and the sewage pipe are connected through the exhaust pipe; When the floating plug moves upward to cause the upper sealing plug to come into conflict with the lower sealing block, the upper sealing plug can seal the lower orifice of the connecting channel.

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