Sewage suction joint

Abstract

The utility model provides a dirt suction connector, and relates to the technical field of dirt suction, in particular to the dirt suction connector. According to the scheme, the dirt suction connector comprises a first connector body, a second connector body and a breaking piece. A breaking piece is mounted on the inner side wall of the first connector, and a supporting part extending inwards is arranged on the inner side wall of the first connector; the outer side wall of the second connector is provided with a clamping part extending outwards, and the clamping part is located between the breaking piece and the supporting part. When the first connector and the second connector move reversely, the clamping part can break off the breaking piece, and the first connector is separated from the second connector. The sewage suction pipe can be automatically disconnected from the sewage outlet when a train is departed, and potential safety hazards caused by the fact that the train drags the sewage suction pipe to move are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage suction, in particular to a sewage suction joint. Background Art

[0002] The toilets on the train use a vacuum suction design. When the flush button is pressed, the excrement in the toilet will be sucked away by the strong vacuum pressure and then transported to the waste box under the carriage through a pipe. The waste box is a sealed container that can store a certain amount of waste. When the waste box is full or reaches the destination, the waste in the waste box needs to be pumped out for its continued use. During the operation, the sewage suction team uses the sewage suction pipe of the sewage suction equipment to connect to the train sewage box. Through the negative pressure of the sewage suction pipe, the sewage in the train sewage box is absorbed into the sewage suction equipment to ensure the normal use of the train sewage box. In actual operation, the sewage suction team moves the sewage suction equipment to the vicinity of the carriage to be sucked, then opens the sewage outlet of the sewage box and connects the sewage suction pipe to the sewage outlet (the sewage suction pipe and the sewage outlet must be safe and firm to avoid leakage), then opens the valve to connect the sewage box with the sewage suction equipment, and the sewage in the sewage box is sucked into the sewage suction equipment under the action of negative pressure.

[0003] During holidays, the number of passengers increases and the number of trains stopping at stations increases, resulting in the workload of the sewage suction team members doubling. Some trains only stop at stations for a dozen minutes, and the sewage suction team members must complete more than a dozen steps such as receiving the train, sucking sewage, confirming and checking, and sending the train within the specified time. The sewage suction team members are under high-intensity working conditions and are on edge, never slacking off for a moment. In order to complete the work, the sewage suction team members will suck sewage from multiple carriages at the same time. Long-term busyness may lead to negligence in taking out the sewage suction pipe, and the train departure time follows the train schedule. If the sewage suction work is not completed by the departure time, the sewage suction pipe will be dragged along when the train departs (the sewage outlet uses a female end quick connector, which cannot be automatically detached after being connected to the sewage suction pipe). After the sewage suction pipe is stretched to the limit distance, it will break at the most vulnerable part, and the sewage suction pipe will be brought into the train running line and move at high speed. The sewage suction pipe made of steel wire hose is bound to endanger driving safety. Utility Model Content

[0004] The purpose of the utility model is to provide a sewage suction joint, which can propose a solution to the deficiencies of the prior art and can automatically disconnect the sewage suction pipe from the sewage outlet when the train departs, thereby avoiding safety hazards caused by the train dragging the sewage suction pipe.

[0005] The utility model is realized by the following technical solutions:

[0006] A sewage suction joint comprises a first connection head, a second connection head and a breaking piece; the inner side wall of the first connection head is installed with a breaking piece, and the inner side wall of the first connection head has a supporting portion extending inward; the outer side wall of the second connection head has a clamping portion extending outward, and the clamping portion is located between the breaking piece and the supporting portion; when the first connection head and the second connection head move in opposite directions along the axial direction, the clamping portion can break the breaking piece, so that the first connection head is separated from the second connection head.

[0007] Furthermore, in the utility model, a plurality of breaking pieces are installed along the circumferential direction on the inner side wall of the first connecting head.

[0008] Furthermore, in the utility model, the above-mentioned breaking piece is detachably connected to the inner side wall of the first connecting head.

[0009] Furthermore, in the utility model, the above-mentioned breaking piece includes an installation part and a breaking part, a first installation groove is provided on both sides of the installation part, a limiting component is installed in the first installation groove, and a second installation groove adapted to the installation part is provided on the inner side wall of the first connecting head, and limiting grooves cooperating with the limiting component are provided on both sides of the second installation groove.

[0010] Furthermore, in the utility model, the above-mentioned limiting assembly includes an elastic member and a limiting member cooperating with the limiting groove, one end of the elastic member is connected to the limiting member, and the other end of the elastic member is connected to the surface wall of the first installation groove.

[0011] Furthermore, in the utility model, when the above-mentioned mounting portion is connected to the second mounting groove, the limiting member is squeezed by the second mounting groove to compress the elastic member.

[0012] Furthermore, in the utility model, one side of the clamping portion cooperates with the supporting portion, and the other side of the clamping portion is provided with a placement groove that cooperates with the breaking portion.

[0013] Furthermore, in the utility model, the above-mentioned first connecting head includes a replacement joint and a main joint, the inner side wall of the replacement joint is detachably connected to the breaking piece, the inner side wall of the main joint has a supporting part extending inwardly, and the replacement joint is detachably connected to the main joint.

[0014] Furthermore, in the utility model, the above-mentioned replacement joint is threadably matched with the main joint.

[0015] Furthermore, in the utility model, a sealing groove is provided along the circumferential direction at the contact point between the support portion and the second connector, and a sealing member is filled in the sealing groove.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] When the train stops at the station, the sewage suction team needs to move the sewage suction equipment to the sewage box and connect the sewage suction pipe to the sewage outlet through the sewage suction joint. With this connection method, the sewage suction team can be more assured to perform sewage suction work on multiple carriages. Even if they forget to remove the sewage suction pipe from the sewage outlet, when the train departs, the train drags the sewage suction pipe to lengthen the sewage pipe until the sewage pipe is straightened. At this time, the female end quick connector of the sewage outlet applies a pulling force to the second connector, and the sewage suction pipe applies a pulling force to the first connector. The first connector and the second connector have a tendency to move in opposite directions. At the same time, the clamping part applies pressure to the breaking piece. When the pressure on the breaking piece reaches the threshold, the breaking piece breaks, and the sewage suction pipe will not remain at the sewage outlet and endanger driving safety. Moreover, there is no need to worry too much about the train departing early and the sewage suction work has not been completed, and the train drags the sewage suction pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 It is a stereoscopic diagram of the sewage suction joint;

[0020] Figure 2 It is a cross-sectional view of the sewage suction joint;

[0021] Figure 3 is a stereoscopic diagram of a first connector;

[0022] Figure 4 is a stereoscopic diagram of the second connector;

[0023] Figure 5 It is a three-dimensional diagram of the broken piece;

[0024] Figure 6 It is a cross-sectional view of the broken part;

[0025] Figure 7 This is a schematic diagram of the sewage suction joint working.

[0026] Marks and corresponding parts names in the attached drawings:

[0027] 1-first connecting head, 2-second connecting head, 3-breaking piece, 4-clamping part, 5-supporting part, 6-replacement joint, 7-sealing groove, 8-main joint, 9-placing groove, 10-breaking part, 11-installing part, 12-second installing groove, 13-elastic part, 14-limiting part, 15-first installing groove, 16-sewage suction pipe, 17-female end quick connector. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0029] Example

[0030] Please refer to Figures 1 to 7 .

[0031] A sewage suction joint comprises a first connection head 1, a second connection head 2 and a breaking piece 3; the breaking piece 3 is installed on the inner side wall of the first connection head 1, and the inner side wall of the first connection head 1 has a supporting portion 5 extending inwardly; the outer side wall of the second connection head 2 has a clamping portion 4 extending outwardly, and the clamping portion 4 is located between the breaking piece 3 and the supporting portion 5; when the first connection head 1 and the second connection head 2 move in opposite directions along the axial direction, the clamping portion 4 can break the breaking piece 3, so that the first connection head 1 and the second connection head 2 are separated.

[0032] In the present embodiment, each carriage of the train is equipped with a sewage tank, and a sewage outlet connected to the sewage tank is provided on the outside of the train. The sewage outlet is installed with a female end quick connector 17, which is convenient for quick connection with a conventional sewage suction pipe 16 in the prior art. The sewage suction pipe 16 can be firmly connected to the sewage tank, and then the valve of the sewage suction pipe 16 and the valve of the sewage tank are opened, and the sewage in the sewage tank is sucked into the sewage suction device under the action of negative pressure; the sewage suction connector is composed of a first connector 1, a second connector 2 and a breaking piece 3, wherein one end of the first connector 1 can be connected to the sewage suction pipe 16, and the connection method can be threaded fit and snap fit, etc. (the connection method is firm and leak-proof), and one end of the second connector 2 can be connected to the sewage outlet of the sewage tank, and the connection method can be Threaded fit and snap fit, etc. (the connection method is firm and leak-proof); the inner wall of the first connecting head 1 is installed with a breaking piece 3 and a supporting part 5, and the breaking piece 3 and the supporting part 5 are relatively arranged on both sides of the inner wall of the first connecting head 1, and the outer wall of one end of the second connecting head 2 is circumferentially installed with a snap-fit ​​part 4, and the snap-fit ​​part 4 is located between the breaking piece 3 and the supporting part 5, and the breaking piece 3 is closer to the other end of the second connecting head 2 than the supporting part 5. Under the limiting action of the breaking piece 3 and the supporting part 5, the snap-fit ​​part 4 can prevent the first connecting head 1 and the second connecting head 2 from being separated; in the sewage suction work, the first connecting head 1 is threadedly matched with the ball valve of the sewage suction pipe 16, and the second connecting head 2 is threadedly matched with the female end quick connector 17 of the sewage outlet. After the sewage suction team has completed the inspection , the ball valve of the sewage suction pipe 16 and the valve of the sewage box can be opened, and the sewage suction equipment can use negative pressure to suck out the sewage in the sewage box. The sewage suction process needs to last for more than ten minutes; when holidays come, the number of passengers increases and the number of trains stopping at the station increases, resulting in the doubling of the workload of the sewage suction team members. In order to complete the work, the sewage suction team members will suck sewage from multiple carriages at the same time. Long-term busyness may lead to the situation of neglecting to take the sewage suction pipe 16. The sewage suction pipe 16 is connected to the sewage outlet of the sewage box through a sewage suction joint. When the train departs, the train drags the sewage suction pipe 16 to lengthen the sewage pipe until the sewage pipe is straightened. At this time, the female end quick connector 17 of the sewage outlet applies a pulling force to the second connector 2, and the sewage suction pipe 16 applies a pulling force to the first connector 1. The first connector 1 and the second connector 2 have a tendency to move in the opposite direction, and the clamping part 4 applies pressure to the breaking piece 3. When the pressure on the breaking piece 3 reaches a threshold, the breaking piece 3 breaks. After the clamping part 4 has no limiting effect on the breaking piece 3, the first connector 1 and the second connector 2 move in the opposite direction, and the first connector 1 is separated from the second connector 2. The sewage suction pipe 16 will not remain at the sewage outlet and be dragged by the train, which avoids the sewage suction pipe 16 made of a steel hose endangering driving safety; further, the material of the breaking piece 3 can be selected from brittle plastics, brittle metals, etc. When the breaking piece 3 is subjected to the pressure of the clamping part 4, the breaking piece 3 is very easy to break, which avoids the problem of the sewage suction pipe 16 breaking and remaining at the sewage outlet. The fracture toughness of the breaking piece 3 is much smaller than that of the sewage suction pipe 16.When the train stops at the station, the sewage suction team needs to move the sewage suction equipment to the sewage box and connect the sewage suction pipe 16 to the sewage outlet through the sewage suction joint. With this connection method, the sewage suction team can be more assured to perform sewage suction work on multiple carriages. Even if they forget to remove the sewage suction pipe 16 from the sewage outlet, when the train departs, the train drags the sewage suction pipe 16 to lengthen the sewage pipe until the sewage pipe is straightened. At this time, the female end quick connector 17 of the sewage outlet applies a pulling force to the second connector 2, and the sewage suction pipe 16 applies a pulling force to the first connector 1. The first connector 1 and the second connector 2 have a tendency to move in the opposite direction. At the same time, the clamping part 4 applies pressure to the breaking piece 3. When the pressure on the breaking piece 3 reaches the threshold, the breaking piece 3 breaks, and the sewage suction pipe 16 will not remain at the sewage outlet and endanger driving safety. Moreover, there is no need to worry too much about the train departing early and the sewage suction work has not been completed, and the train drags the sewage suction pipe 16.

[0033] Furthermore, in the utility model, a plurality of breaking pieces 3 are installed along the circumferential direction on the inner side wall of the first connecting head 1 .

[0034] In this embodiment, multiple breaking pieces 3 can be equidistantly arranged on the inner wall of the first connecting head 1, the supporting part 5 is circumferentially arranged along the inner wall of the first connecting head 1, and the clamping part 4 is circumferentially arranged along one end of the second connecting head 2; the clamping part 4 is limited between the multiple breaking pieces 3 and the supporting part 5, so that each position of the clamping part 4 can be limited, reducing the gap after the first connecting head 1 is connected to the second connecting head 2, and avoiding the leakage of dirt from the sewage suction joint during the sewage suction work; on the other hand, multiple breaking pieces 3 limit the clamping part 4, and when the first connecting head 1 is separated from the second connecting head 2, multiple breaking pieces 3 need to be broken, avoiding the problem of breaking the breaking piece 3 due to error operation when limiting the clamping part 4 by one breaking piece 3. The sewage suction team can calculate the appropriate number of breaking pieces 3 according to the material and size of the breaking piece 3 and install them on the inner wall of the first connecting head 1.

[0035] Furthermore, in the utility model, the breaking piece 3 is detachably connected to the inner side wall of the first connecting head 1 .

[0036] In the present embodiment, during the sewage suction operation, if the sewage suction team members neglect to take the sewage suction pipe 16, the train will drag the sewage suction pipe 16 until the first connector 1 and the second connector 2 are separated. During the above process, the clamping portion 4 will apply pressure to the breaking portion 10 to break the breaking portion 10; after the breaking portion 10 of the inner wall of the first connector 1 is broken, the residue remaining in the first connector 1 after the breaking of the breaking piece 3 can be taken out, and then the complete breaking piece 3 can be installed on the inner wall of the first connector 1, so that it can continue to be used in conjunction with the second connector 2; the problem of needing to replace the entire first connector 1 after the breaking piece 3 on the inner wall of the first connector 1 is avoided.

[0037] Furthermore, in the utility model, the breaking piece 3 includes a mounting portion 11 and a breaking portion 10, a first mounting groove 15 is provided on both sides of the mounting portion 11, a limiting assembly is installed in the first mounting groove 15, and a second mounting groove 12 adapted to the mounting portion 11 is provided on the inner side wall of the first connecting head 1, and limiting grooves cooperating with the limiting assembly are provided on both sides of the second mounting groove 12.

[0038] In this embodiment, the breaking piece 3 is composed of a mounting portion 11 and a breaking portion 10, the mounting portion 11 is connected to the breaking portion 10, the mounting portion 11 is horizontally arranged and has first mounting grooves 15 on both sides, a limiting component is installed in the first mounting groove 15, and the mounting portion 11 can be detachably installed in the second mounting groove 12 on the inner side wall of the first connecting head 1. Specifically, the mounting portion 11 is placed in the second mounting groove 12, the limiting components on both sides of the mounting portion 11 are matched with the corresponding limiting grooves, and the mounting portion 11 is fixed in the second mounting groove 12, the breaking portion 10 is located outside the second mounting groove 12, and the clamping portion 4 can be limited; after the breaking piece 3 is broken, there is no need to replace the first connecting head 1 as a whole, the breaking piece 3 can be taken out of the second mounting groove 12, and the complete breaking piece 3 can be replaced.

[0039] Furthermore, in the utility model, the limiting assembly includes an elastic member 13 and a limiting member 14 cooperating with the limiting groove, one end of the elastic member 13 is connected to the limiting member 14 , and the other end of the elastic member 13 is connected to the surface wall of the first installation groove 15 .

[0040] In this embodiment, the limiting component is composed of an elastic member 13 and a limiting member 14, one end of the elastic member 13 is connected to the deepest surface wall of the first mounting groove 15, and the other end of the elastic member 13 is connected to the limiting member 14. When the mounting portion 11 is connected to the second mounting groove 12, the sewage suction team presses the limiting member 14 to compress the elastic member 13 until the limiting member 14 moves into the first mounting groove 15, and then puts the mounting portion 11 into the second mounting groove 12. The size and shape of the second mounting groove 12 are adapted to the mounting portion 11. When the mounting portion 11 moves in the second mounting groove 12, the limiting member 14 continues to stay in the first mounting groove 15 under the abutment of the surface wall of the second mounting groove 12. When the first mounting groove 15 of the part 11 moves to the limiting groove, a part of the limiting member 14 bounces into the limiting groove under the action of the elastic member 13, and the other part stays in the first mounting groove 15; after the limiting members 14 on both sides of the mounting part 11 move to the limiting groove, the mounting part 11 is fixed, thereby realizing the fixation of the breaking part 10, and the clamping part 4 can be limited; after the breaking part 10 is broken, the sewage suction team can take the mounting part 11 out of the second mounting groove 12, and then replace the complete breaking part 3; further, the elastic member 13 can be a reset spring, one end of the reset spring is connected to the deepest surface wall of the first mounting groove 15, and the other end of the reset spring is connected to the limiting member 14.

[0041] Furthermore, in the utility model, the limiting member 14 is a wedge-shaped structure, and when the mounting portion 11 is connected to the second mounting groove 12 , the limiting member 14 is squeezed by the second mounting groove 12 to compress the elastic member 13 .

[0042] In this embodiment, both sides of the limiting member 14 are bevel structures. Before the mounting portion 11 enters the second mounting groove 12, a portion of the limiting member 14 is located outside the first mounting groove 15 under the action of the elastic member 13. When the mounting portion 11 enters the second mounting groove 12, one side of the limiting member 14 abuts against the second mounting groove 12. After the limiting member 14 is subjected to pressure, the pressure is transmitted to the elastic member 13. The elastic member 13 contracts to move the limiting member 14 to the first mounting groove 15. When the limiting member 14 moves to the limiting groove, a portion of the limiting member 14 moves into the limiting groove under the action of the elastic member 13. To replace the broken member 3, the mounting member 3 needs to be replaced. The part 11 is taken out from the second mounting groove 12, and the mounting part 11 is pulled outward. One side of the limiting member 14 abuts against the limiting groove. After the limiting member 14 is subjected to pressure, the pressure is transferred to the elastic member 13. The elastic member 13 contracts to move the limiting member 14 to the first mounting groove 15. After the limiting member 14 leaves the second mounting groove 12, a part of the limiting member 14 moves out of the first mounting groove 15 under the action of the elastic member 13; in summary, the two sides of the limiting member 14 are beveled edge structures, which can make it more convenient to install the mounting part 11 in the second mounting groove 12 or take the mounting part 11 out of the second mounting groove 12, and replace the broken part 3.

[0043] Furthermore, in the utility model, one side of the clamping portion 4 cooperates with the supporting portion 5 , and the other side of the clamping portion 4 is provided with a placement groove 9 that cooperates with the breaking portion 10 .

[0044] In the present embodiment, when the first connector 1 and the second connector 2 are not separated, the clamping portion 4 is limited between the breaking portion 10 and the supporting portion 5, and a placement groove 9 is provided on the upper side of the clamping portion 4, and the breaking portion 10 falls into the placement groove 9, thereby limiting the relative rotation of the first connector 1 and the second connector 2, avoiding the problem of long-term relative friction loss of the surface of the clamping portion 4 and the supporting portion 5, which affects the sealing performance.

[0045] Furthermore, in the utility model, the first connector 1 includes a replacement connector 6 and a main connector 8, the inner side wall of the replacement connector 6 is detachably connected to the breaking piece 3, the inner side wall of the main connector 8 has a supporting portion 5 extending inward, and the replacement connector 6 is detachably connected to the main connector 8.

[0046] In this embodiment, the first connecting head 1 is composed of a replacement joint 6 and a main joint 8, wherein the breaking piece 3 is installed on the replacement joint 6, and the supporting part 5 is installed on the main joint 8. The replacement joint 6 and the main joint 8 are detachably connected. After the breaking piece 3 is broken, the breaking piece 3 needs to be replaced, and the mounting part 11 in the second mounting groove 12 is taken out, and the complete breaking piece 3 is replaced in the second mounting groove 12. If the same replacement joint 6 is used for a long time, the second mounting groove 12 of the replacement joint 6 will be deformed (each time the breaking part 10 breaks, it will be pressed toward the second mounting groove 12). If the replacement joint 6 is not replaced in time, the subsequent sewage suction operation will be affected. By only replacing the replacement joint 6 and retaining the main joint 8, more resources can be saved.

[0047] Furthermore, in the utility model, the replacement joint 6 is threadedly matched with the main joint 8 .

[0048] In this embodiment, the inner wall at the lower side of the replacement joint 6 is provided with threads, and the outer wall at the upper side of the main joint 8 is provided with threads. The replacement joint 6 and the main joint 8 are threadedly matched to achieve installation and disassembly, which is easy to operate.

[0049] Furthermore, in the utility model, a sealing groove 7 is provided along the circumferential direction at the contact point between the support portion 5 and the second connector 2 , and the sealing groove 7 is filled with a sealing member.

[0050] In this embodiment, the sealing groove 7 is located directly below the second connecting head 2. The support part 5 is provided with the sealing groove 7, which can not only reduce the material consumption and save costs, but also the sealing groove 7 is filled with sealing members (sealing rings, sealing fillers, etc.) which can reduce the gap between the second connecting head 2 and the support part 5, thereby avoiding leakage during the sewage suction operation.

[0051] The sewage suction pipe 16 is connected to the sewage outlet through the sewage suction joint. When the sewage suction pipe 16 is connected to the sewage outlet, the ...

[0052] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A sewage suction joint, characterized in that: It includes a first connector, a second connector and a breaking piece; The breaking piece is installed on the inner side wall of the first connector, and the inner side wall of the first connector has a supporting portion extending inwardly; The outer side wall of the second connector has a clamping portion extending outward, and the clamping portion is located between the breaking piece and the supporting portion; When the first connecting head and the second connecting head move in opposite directions along the axial direction, the clamping portion can break the breaking piece, so that the first connecting head is separated from the second connecting head.

2. The sewage suction joint according to claim 1, characterized in that: A plurality of breaking pieces are circumferentially mounted on the inner side wall of the first connecting head.

3. The sewage suction joint according to claim 1, characterized in that: The breaking piece is detachably connected to the inner side wall of the first connecting head.

4. The sewage suction joint according to claim 3, characterized in that: The breaking piece includes a mounting portion and a breaking portion, both sides of the mounting portion are provided with a first mounting groove, a limiting component is installed in the first mounting groove, the inner side wall of the first connecting head is provided with a second mounting groove adapted to the mounting portion, and both sides of the second mounting groove are provided with limiting grooves that cooperate with the limiting component.

5. The sewage suction joint according to claim 4, characterized in that: The limiting assembly includes an elastic member and a limiting member matched with the limiting groove, one end of the elastic member is connected to the limiting member, and the other end of the elastic member is connected to the surface wall of the first installation groove.

6. The sewage suction joint according to claim 5, characterized in that: The limiting member is a wedge-shaped structure. When the mounting portion is connected to the second mounting groove, the limiting member is squeezed by the second mounting groove to compress the elastic member.

7. The sewage suction joint according to any one of claims 4 to 6, characterized in that: One side of the clamping portion cooperates with the supporting portion, and the other side of the clamping portion is provided with a placement groove that cooperates with the breaking portion.

8. The sewage suction joint according to any one of claims 3 to 5, characterized in that: The first connector includes a replacement connector and a main connector. The inner side wall of the replacement connector is detachably connected to the breaking piece. The inner side wall of the main connector has the supporting portion extending inwardly. The replacement connector is detachably connected to the main connector.

9. The sewage suction joint according to claim 8, characterized in that: The replacement joint is threadably matched with the main joint.

10. The sewage suction joint according to any one of claims 1 to 6, characterized in that: A sealing groove is circumferentially formed at a contact point between the support portion and the second connector, and a sealing member is filled in the sealing groove.

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