A water-sealed floor drain

Abstract

The present invention provides a water-sealed floor drain, comprising a floor drain core with a closed bottom, and a submersible tube set in the floor drain core, a drainage hole is opened in the middle and upper part of the floor drain core, and the lower end of the submersible tube is lower than the horizontal plane where the drainage hole is located; the floor drain core can be expanded and contracted up and down within a certain range as the amount of water in it changes. By setting the floor drain core and the submersible tube, a water seal is formed to prevent the odor in the sewer pipe from entering the room; and the floor drain core can be expanded and contracted up and down within a certain range as the amount of water in it changes. When there is no drainage at the floor drain for a long time, the water in the floor drain core partially evaporates to reduce the liquid level. Since the floor drain core can be expanded and contracted up and down as the amount of water in it changes, the floor drain core shrinks, so that the distance between the lower end of the floor drain core and the lower end of the submersible tube is reduced, so as to prevent the water seal liquid level in the floor drain core from being lower than the lower end of the submersible tube, resulting in water seal failure; this can provide continuous water seal protection, which is beneficial to improving the sealing performance of the floor drain.

Description

Technical Field

[0001] The invention belongs to the technical field of floor drains, and in particular relates to a water-sealed floor drain. Background Art

[0002] The floor drain is an important component that connects the sewer pipe and the indoor floor. As an important part of the drainage system, the performance of the floor drain directly affects the indoor environmental quality and air quality. The floor drain can discharge domestic sewage into the sewage pipe, making people's lives clean and comfortable.

[0003] In order to prevent the odor in the sewer pipe from entering the room through the floor drain, water seals or one-way valves are generally used. For the blocking effect, water seal floor drains are better. Because there must be a gap between the one-way valve and the floor drain, and dirt often adheres to the end surface of the floor drain and the one-way valve in contact, the one-way valve cannot be closed, so that the odor in the sewer pipe can reach the room through the gap; the water seal floor drain blocks the odor in the sewer pipe from entering the room by leaving some water in the floor drain after drainage; but when no one is at home for many consecutive days, the water that is conducive to forming the water seal evaporates, causing the liquid level to drop, and it cannot play a blocking role, so that the odor in the sewer pipe can reach the room.

[0004] In addition, the water discharged by the washing machine must also flow through the floor drain; however, there are the following problems: 1. The current drainage pipe of the washing machine cannot be tightly connected with the floor drain, the size does not match, or the matching gap is too large, so that the drainage pipe of the washing machine cannot be installed, or there is a large gap that returns odor; resulting in the odor and even bacteria from the sewer no longer entering the washing machine, resulting in the generation of odor and bacteria inside the washing machine; preventing the sewer odor and bacteria from passing through the gap between the drainage pipe and the sewer into the room. 2. Because the water flows too fast when the washing machine is draining, the water cannot be drained from the floor drain in time, which makes it easy for the washing machine to overflow and wet the ground when draining, causing inconvenience to people. 3. Because the drainage pipe of the washing machine is a hose, the bend is irregular and unsightly when it turns and inserts into the sewer or floor drain. Summary of the invention

[0005] The present invention aims at the above problems existing in the prior art and provides a water-sealed floor drain, which can expand and contract up and down with the change of the water volume therein by arranging a submersible pipe, thereby avoiding the failure of the water seal caused by the evaporation of the water forming the water seal.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A water-sealed floor drain comprises a floor drain core with a sealed bottom and a submersible pipe sleeved in the floor drain core, a drainage hole is provided in the middle and upper part of the floor drain core, and the lower end of the submersible pipe is lower than the horizontal plane where the drainage hole is located; the floor drain core can expand and contract up and down within a certain range as the amount of water therein changes.

[0008] Furthermore, the floor drain core has at least one section of a retractable elastic tube.

[0009] Furthermore, as the water in the floor drain core evaporates, the amount of water in the floor drain core gradually decreases, and the downward force exerted on the elastic tube gradually decreases, so that the elastic tube gradually returns to its original position upward.

[0010] Furthermore, the floor drain core has a first fixed tube and a second fixed tube respectively located above and below the elastic tube, and the first fixed tube and the second fixed tube are respectively sealed and connected to the elastic tube.

[0011] Furthermore, water discharge holes are provided at intervals in the circumferential direction of the first fixed pipe.

[0012] Furthermore, drain holes are spaced apart in the circumferential direction of the elastic tube, and the size of the drain holes changes with the expansion and contraction of the elastic tube.

[0013] Furthermore, a water discharge hole is provided between the first fixed tube and the second fixed tube, and a flexible limiter is provided to limit the maximum telescopic length of the elastic tube.

[0014] Furthermore, the flexible limiting member is a plurality of limiting strips arranged at intervals, the upper ends of the limiting strips are fixed on the first fixed tube, and the lower ends of the limiting strips are fixed on the second fixed tube.

[0015] Furthermore, an axial partition is provided in the submersible tube, and the partition divides the space inside the submersible tube into a first drainage passage for draining water from the washing machine and a second drainage passage for draining water from the ground.

[0016] Furthermore, a cover for closing the first drainage passage is provided at the upper end of the submersible pipe, and a nozzle connected to a drainage pipe is provided on the cover.

[0017] Furthermore, it also includes a floor drain base groove and a surface cover arranged on the top of the floor drain base groove. The bottom of the floor drain base groove is provided with a drain port connected to the sewer pipe, and the set floor drain core and the submersible pipe are sealed and fixed at the drain port.

[0018] Furthermore, a filter hole and a through hole connected to a drain pipe of the washing machine are provided on the surface cover, and a first connecting pipe is sealed and fixed at the through hole.

[0019] Furthermore, it also includes a bent pipe sealedly connected to the upper end of the first connecting pipe, and the other end of the bent pipe is detachably sealedly connected to the drain pipe.

[0020] Furthermore, a second connecting pipe is sealedly connected between the nozzle of the first sewer passage and the first connecting pipe.

[0021] Furthermore, the upper end of the floor drain core is provided with a first flange portion that is bent outward and extends radially, and the first flange portion is sealed on the bottom surface of the floor drain base groove.

[0022] Furthermore, a first annular seal is provided between the first flange portion and the floor drain base groove.

[0023] Furthermore, the upper end of the submersible tube is provided with a second flange portion that is bent outward and extends radially, and the second flange portion is sealed and superimposed on the top of the first flange portion.

[0024] Furthermore, a second annular seal is provided between the first flange portion and the second flange portion.

[0025] Furthermore, the first flange portion and the second flange portion are sealed by extrusion deformation.

[0026] Furthermore, a one-way valve capable of closing the second water discharge passage is provided at the lower end of the submersible pipe.

[0027] Furthermore, the one-way valve is an elastic diaphragm, a downwardly extending fixing portion is provided at the lower end of the diving tube, a radial fixing hole is opened on the fixing portion, an elastic column matching the fixing hole is provided on the one-way valve, the elastic column is located in the fixing hole, and a plug is provided at the outer end of the elastic column to block the outside of the fixing hole.

[0028] Furthermore, a threaded connection is formed between the connecting pipe and the through port, and a radially extending rib is provided at the lower end of the connecting pipe, and the rib is stopped below the surface cover.

[0029] Furthermore, the drain port of the floor drain base trench is sealed and connected to a sewer pipe, and the floor drain core and the submersible pipe are sleeved in the sewer pipe.

[0030] Furthermore, the radial distance between the sewer pipe and the lower part of the floor drain core is smaller than the radial distance between the lower part of the floor drain core and the lower part of the submersible pipe.

[0031] Furthermore, the radial annular area between the sewer pipe and the lower part of the floor drain core is equal to the radial annular area between the lower end of the floor drain core and the lower end of the submersible pipe.

[0032] The water-sealed floor drain provided by the present invention is provided with a floor drain core and a diving pipe which are arranged in a set, and a drainage hole is opened in the middle and upper part of the floor drain core, and the lower end of the diving pipe is lower than the horizontal plane where the drainage hole is located, so that the water below the drainage hole in the floor drain core cannot be discharged, thereby forming a water seal and preventing the odor in the drainage pipe from entering the room; and the floor drain core can expand and contract up and down within a certain range as the amount of water therein changes. When the floor drain is not drained for a long time, the water in the floor drain core partially evaporates and the liquid level is lowered. Since the floor drain core can expand and contract up and down as the amount of water therein changes, the floor drain core contracts at this time, so that the distance between the lower end of the floor drain core and the lower end of the diving pipe is reduced, thereby preventing the water seal liquid level in the floor drain core from being lower than the lower end of the diving pipe, resulting in water seal failure; in this way, continuous water seal protection can be provided, which is beneficial to improving the sealing performance of the floor drain.

[0033] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the first embodiment of the water-sealed floor drain proposed by the present invention;

[0035] Figure 2 for Figure 1 Schematic diagram of the structure from top view;

[0036] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure in the middle AA direction;

[0037] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0038] Figure 5 for Figure 4 Schematic diagram of the structure after the middle floor drain core is shrunk;

[0039] Figure 6 This is a schematic diagram of the explosion structure of the floor drain;

[0040] Figure 7 for Figure 6 A schematic diagram of the enlarged structure of the middle floor drain core;

[0041] Figure 8 for Figure 6 Schematic diagram of the enlarged structure of the diving pipe.

[0042] Fig. 9 It is a structural schematic diagram of a second embodiment of the water-sealed floor drain proposed by the present invention;

[0043] Fig.10 for Fig. 9 A schematic diagram of the enlarged structure of the middle floor drain core;

[0044] Fig.11 It is a schematic structural diagram of a third embodiment of the water-sealed floor drain proposed by the present invention. DETAILED DESCRIPTION

[0045] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0046] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "upper", "lower", "left", "right", etc. are based on the positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] See also Figure 1-Figure 8 , is an embodiment of the water-sealed floor drain proposed by the present invention, a water-sealed floor drain comprises a floor drain core 6 with a closed bottom, and a submersible pipe 5 set in the floor drain core 6, a drainage hole 61 is opened in the middle and upper part of the floor drain core 6, the lower end of the submersible pipe 5 is lower than the horizontal plane where the drainage hole 61 is located, and the water below the drainage hole 61 will remain in the floor drain core 6 after the drainage is completed, and the water between the liquid level in the floor drain core 6 and the lower end of the submersible pipe 5 forms a water seal, so that odors and the like cannot pass through the floor drain; the floor drain core 6 is arranged to be able to expand and contract up and down within a certain range as the amount of water therein changes; when the floor drain is not drained for a long time, the water in the floor drain core 6 partially evaporates to lower the liquid level, and since the floor drain core 6 can expand and contract up and down as the amount of water therein changes, the floor drain core 6 contracts at this time, so that the distance between the lower end of the floor drain core 6 and the lower end of the submersible pipe 5 is reduced, so as to avoid the water seal liquid level in the floor drain core 6 being lower than the lower end of the submersible pipe 5, resulting in water seal failure; in this way, continuous water seal protection can be provided, which is conducive to improving the sealing performance of the floor drain.

[0048] In this embodiment, see Figure 7As shown, the floor drain core 6 has at least one section of retractable elastic tube 66, and the floor drain core 6 can be retracted in the up and down directions by the elastic tube 66. The elastic tube 66 can be a rubber tube or the like. The floor drain core has a non-elastic first fixed tube 67 and a second fixed tube 68 respectively located above and below the elastic tube 66, and the first fixed tube 67 and the second fixed tube 68 are respectively sealed and connected to the elastic tube 66; thus, the retracted floor drain core 6 is realized by setting the elastic tube 66, and the first fixed tube 67 and the second fixed tube 68 are set to maintain the outer structure of the floor drain core 6, so that the floor drain core 6 only needs to be deformed in the up and down directions; this is beneficial to the sealing and fixing of the floor drain core 6, and the ability of the floor drain core 6 to withstand the impact of water flow.

[0049] In this embodiment, water discharge holes 61 are provided at intervals in the circumferential direction of the first fixed tube 67 , that is, the elastic tube 66 is disposed below the water discharge hole 61 . After the drainage is completed, the water remaining below the drain hole 61 in the floor drain core 6 forms a water seal. At this time, the amount of water in the floor drain core 6 is the largest. Due to the gravity of the water in the floor drain core 6, the elastic tube 66 is stretched and in the lowest position of the extension; when the floor drain is not drained for a long time, the water in the floor drain core 6 gradually evaporates, so that the amount of water in the floor drain core 6 gradually decreases, and the downward force on the elastic tube 66 is gradually reduced, so that the elastic tube 66 gradually resets upward, so that the distance between the lower end of the floor drain core 6 and the lower end of the diving tube 5 gradually decreases; such a gradual change is conducive to the liquid level in the floor drain core 6 being maintained near the bottom of the drain hole 61 for a long time, and is conducive to the lower end of the diving tube 5 being lower than the liquid level in the floor drain core 6, which is conducive to improving the continuous water seal protection, avoiding the liquid level in the floor drain core 6 being lower than the lower end of the diving tube 5, and avoiding the water forming the water seal caused by the floor drain core 6 expanding and contracting too quickly to flow out through the drain hole 61.

[0050] In this embodiment, a flexible limiter is provided between the first fixed tube 67 and the second fixed tube 68 to limit the maximum telescopic length of the elastic tube 66; when the floor drain is drained, especially when the rapid water flow discharged by power is discharged through the floor drain, it has a large downward impact force on the floor drain core 6; by providing a flexible limiter, the elastic tube 66 is prevented from being subjected to a large force, causing elastic deformation failure. When the floor drain is drained, the elastic tube 66 is stretched and is in the lowest extended position, and the large impact force received by the second fixed tube 68 is transmitted to the first fixed tube 67 through the flexible limiter, that is, the length of the flexible limiter is set to correspond to the maximum length of the elastic tube 66 after stretching. Specifically, the flexible limiter is a plurality of limit strips arranged at intervals, the upper end of the limit strip is fixed on the first fixed tube 67, and the lower end of the limit strip is fixed on the second fixed tube 68; preferably, the limit strip is a rope.

[0051] In this embodiment, see Figure 4As shown, an axial partition 51 is provided in the submersible pipe 5, that is, the partition 51 is parallel to the axis of the submersible pipe 5; the partition 51 divides the space inside the submersible pipe 5 into a first water discharge passage 52 for washing machine drainage and a second water discharge passage 53 for ground drainage. By arranging the submersible pipe 5 to be arranged on the bottom surface of the floor drain base groove 1 and extending downward, the submersible pipe 5 hardly occupies the space in the floor drain base groove 1, so that the floor drain base groove 1 has a large accommodation space for accommodating water flowing from the ground, effectively avoiding the situation of untimely ground drainage. By dividing the submersible pipe 5 into the first water discharge passage 52 and the second water discharge passage 53, the washing machine drainage and the ground drainage are respectively passed through different spaces in the submersible pipe 5, avoiding the situation of backflow when the washing machine is drained with a large water flow, that is, the first water discharge passage 52 is connected to the washing machine drainage pipe 10. Specifically, a cover 55 for closing the first water discharge passage 52 is provided at the upper end of the submersible pipe 5, and a nozzle 551 connected to the drainage pipe 10 is provided on the cover 55.

[0052] In this embodiment, the floor drain also includes a floor drain base groove 1 and a surface cover 2 arranged on the top of the floor drain base groove 1, and a filter hole 21 and a through hole connected to the washing machine drain pipe 10 are opened on the surface cover 2; a drain outlet connected to the sewer pipe 20 is opened at the bottom of the floor drain base groove 1, and a set of floor drain core 6 and submersible pipe 5 are sealed and fixed at the drain outlet; in this way, the floor drain core 6 and the submersible pipe 5 are both accommodated downward in the sewer pipe 20, so that the length design of the floor drain core 6 and the submersible pipe 5 is almost unlimited. Increasing the length of the floor drain core 6 and the submersible pipe 5 is beneficial to increasing the height of the water seal, and trying to avoid the situation where the water level in the water seal drops below the lower end of the submersible pipe 5, and the optimal length can be selected.

[0053] In this embodiment, a matching first connecting pipe 3 is provided at the opening of the face cover 2, and the first connecting pipe 3 is sealed and fixed at the opening. The washing machine drain pipe 10 is connected to the opening by the first connecting pipe 3 being sealed and fixed at the opening; in this way, the drain pipe 10 does not need to be inserted into the face cover 2, and the drain pipe 10 and the first connecting pipe 3 are sealed and connected, avoiding the assembly gap of the washing machine drain flow path, which is beneficial to improving the sealing of the washing machine drain flow path and avoiding the gap from returning odor or water; and a filter hole 21 is provided on the face cover 2, and the water on the ground can flow into the floor drain assembly through the filter hole, that is, the floor drain assembly can simultaneously drain the washing machine and the ground.

[0054] In this embodiment, the floor drain assembly further comprises an elbow 4 sealedly connected to the upper end of the first connecting pipe 3, and the other end of the elbow 4 is detachably sealedly connected to the drain pipe 10; by providing the elbow 4, firstly, the sealing assembly operation of the drain pipe 10 and the elbow 4 is simple, which is conducive to improving the assembly efficiency of the drain pipe 10; secondly, the drainage water flow is limited to a fixed flow direction by the elbow 4, which is conducive to the smoothness of the drainage water flow; thirdly, the elbow 4 is a regular right-angle structure, which is conducive to the appearance of the floor drain assembly. Preferably, the elbow 4 is detachably connected to the first connecting pipe 3, and after the drain pipe 10 is disassembled, the elbow 4 can also be disassembled without occupying the indoor space above the face cover 2.

[0055] In this embodiment, see Figure 8 As shown, a second connecting pipe 7 is sealedly connected between the nozzle 551 of the first water discharge passage 52 and the first connecting pipe 3, and the lower end of the second connecting pipe 7 is sealed and fixed on the nozzle 551. The second connecting pipe 7 is a hose; the first water discharge passage 52 is connected to the first connecting pipe 3 through the sealed second connecting pipe 7, so that the drainage of the washing machine drain pipe 10 all flows into the first water discharge passage 52. This is conducive to the sealed connection between the second connecting pipe 7 and the first water discharge passage 52, and is conducive to improving the assembly efficiency of the second connecting pipe 7 and the first water discharge passage 52, as well as increasing the sealing performance after fixation. In this way, the drainage flow path of the washing machine is composed of the drain pipe 10, the curved pipe 4, the first connecting pipe 3, the second connecting pipe 7, the first drain passage 52 of the submersible pipe 5, and the floor drain core 6; specifically, it is first discharged from the drain pipe 10, flows through the curved pipe 4, the first connecting pipe 3, the second connecting pipe 7, and then reaches the first drain passage 52 of the submersible pipe 5, and rushes out from the lower end of the submersible pipe 5 to reach the floor drain core 6; then it flows upward along the space between the floor drain core 6 and the submersible pipe 5, reaches the drain hole 61 and flows out of the floor drain core 6.

[0056] In this embodiment, see Figure 7 As shown, the upper end of the floor drain core 6 is provided with a first flange portion 63 that is bent outward and extends radially, and the first flange portion 63 is sealed on the bottom surface of the floor drain base groove 1, that is, the floor drain core 6 and the floor drain base groove 1 are sealed, and the first flange portion 63 is provided to facilitate the sealing and fixing of the floor drain core 6. Specifically, a first annular seal is provided between the first flange portion 63 and the floor drain base groove 1 to prevent the odor in the sewer pipe 20 from being emitted into the room through the gap between the first flange portion 63 and the floor drain base groove 1.

[0057] In this embodiment, see Figure 8As shown, the upper end of the submersible pipe 5 is provided with a second flange portion 57 that is bent outward and extends radially. The second flange portion 57 is sealed and superimposed on the top of the first flange portion 63. The second flange portion 57 is provided to facilitate the sealing and fixation of the submersible pipe 5; and there is no gap between the second flange portion 57 and the first flange portion 63, so that the odor in the sewer pipe 20 enters the floor drain core 6 through the sewer hole 61, thereby preventing the odor from passing through the gap between the first flange portion 63 and the floor drain base groove 1 and dissipating into the room; at the same time, it is prevented that foam overflows from between the drain core 6 and the submersible pipe 5 to reach the floor drain base groove 1.

[0058] Regarding the sealing arrangement between the first flange portion 63 and the second flange portion 57, in this embodiment, a second annular seal is provided between the first flange portion 63 and the second flange portion 57. In other implementations, the first flange portion 63 and the second flange portion 57 may also be sealed by extrusion deformation.

[0059] In the present embodiment, after the washing machine drainage or the ground drainage flows through the submersible pipe 5, the water flows into the floor drain core 6 and the space between the floor drain core 6 and the submersible pipe 5, then flows through the sewer hole 61 to reach the space between the submersible pipe 5 and the sewer pipe 20, and finally flows along the sewer pipe 20; therefore, the radial distance between the sewer pipe 20 and the lower part of the floor drain core 6 is smaller than the radial distance between the lower part of the floor drain core 6 and the lower part of the submersible pipe 5. It is preferably arranged that the radial annular area between the sewer pipe 20 and the lower part of the floor drain core 6 is equal to the radial annular area between the lower part of the floor drain core 6 and the lower part of the submersible pipe 5. This is beneficial to improving the drainage capacity of the floor drain assembly and avoiding the situation where the water flows untimely as much as possible.

[0060] See also Figure 9-10 , is the second embodiment of the water-sealed floor drain proposed by the present invention. The main difference between this embodiment and the first embodiment is that the elastic tube is arranged at a different position on the floor drain core, and other structures can adopt the same structure as the first embodiment.

[0061] A water-sealed floor drain comprises a floor drain core 6 with a sealed bottom, and a submersible tube 5 set in the floor drain core 6, a drainage hole 61 is opened in the middle and upper part of the floor drain core 6, the lower end of the submersible tube 5 is lower than the horizontal plane where the drainage hole 61 is located, and the water below the drainage hole 61 will remain in the floor drain core 6 after drainage is completed, and the water between the liquid level in the floor drain core 6 and the lower end of the submersible tube 5 forms a water seal, so that odors and the like cannot pass through the floor drain; the floor drain core 6 is arranged to be able to expand and contract up and down within a certain range as the amount of water therein changes; when the floor drain is not drained for a long time, the water in the floor drain core 6 partially evaporates to lower the liquid level, and since the floor drain core 6 can expand and contract up and down as the amount of water therein changes, the floor drain core 6 contracts at this time, so that the distance between the lower end of the floor drain core 6 and the lower end of the submersible tube 5 is reduced, so as to avoid the water seal liquid level in the floor drain core 6 being lower than the lower end of the submersible tube 5, resulting in water seal failure; this can provide continuous water seal protection, which is beneficial to improving the sealing performance of the floor drain.

[0062] In this embodiment, the floor drain core 6 has at least one section of retractable elastic tube 66, and the floor drain core 6 can be retracted in the up and down directions by the elastic tube 66. The elastic tube 66 can be a rubber tube or the like. The floor drain core has a non-elastic first fixed tube 67 and a second fixed tube 68 respectively located above and below the elastic tube 66, and the first fixed tube 67 and the second fixed tube 68 are respectively sealed and connected to the elastic tube 66; thus, the retracted floor drain core 6 is realized by setting the elastic tube 66, and the first fixed tube 67 and the second fixed tube 68 are set to maintain the outer structure of the floor drain core 6, so that the floor drain core 6 only needs to be deformed in the up and down directions; this is beneficial to the sealing and fixing of the floor drain core 6, and the ability of the floor drain core 6 to withstand the impact of water flow.

[0063] In this embodiment, drain holes 61 are provided at intervals in the circumferential direction of the elastic tube 66, and the size of the drain holes 61 changes with the expansion and contraction of the elastic tube 66. When the floor drain is draining, the elastic tube 66 is extended and is at the lowest extended position. At this time, due to the extension of the elastic tube 66, the drain holes 61 also extend and become larger, which is conducive to the discharge of water in the floor drain core 6 and the improvement of the drainage volume of the floor drain. After the drainage is completed, the water remaining below the drain hole 61 in the floor drain core 6 forms a water seal. At this time, the amount of water in the floor drain core 6 is the largest. Due to the gravity of the water in the floor drain core 6, the elastic tube 66 is stretched and in the lowest position of the extension; when the floor drain is not drained for a long time, the water in the floor drain core 6 gradually evaporates, so that the amount of water in the floor drain core 6 gradually decreases, and the downward force received by the elastic tube 66 also gradually decreases, so that the elastic tube 66 gradually resets upward, so that the drain hole 61 also gradually becomes smaller and resets, so that the distance between the lower end of the floor drain core 6 and the lower end of the diving tube 5 gradually decreases; such a gradual change is conducive to the liquid level in the floor drain core 6 being kept near the bottom of the drain hole 61 for a long time, and is conducive to the lower end of the diving tube 5 being lower than the liquid level in the floor drain core 6, which is conducive to improving the continuous water seal protection, avoiding the liquid level in the floor drain core 6 being lower than the lower end of the diving tube 5, and avoiding the water forming the water seal caused by the floor drain core 6 expanding and contracting too quickly to flow out through the drain hole 61. At the same time, the drain hole 61 gradually becomes smaller and resets, reducing the connection area between the floor drain core 6 and the floor drain pipe 20, reducing the path for the water in the floor drain core 6 to evaporate into the floor drain pipe 20, which is beneficial to reduce the evaporation rate of the water in the floor drain core 6.

[0064] See also Fig.11 , is the third embodiment of the water-sealed floor drain proposed by the present invention. The main difference between this embodiment and the first embodiment is that a one-way valve is provided at the lower end of the second drainage passage, and other structures can adopt the same structure as the first embodiment.

[0065] In this embodiment, a one-way valve 54 capable of closing the second water discharge passage 53 is provided at the lower end of the submersible pipe 5 to prevent water from rushing out of the first water discharge passage 52 of the submersible pipe 5 when the washing machine is drained, especially to prevent foam from entering the second water discharge passage 53, and to avoid overflow. Preferably, the one-way valve 54 is an elastic diaphragm, and a downwardly extending fixing portion 56 is provided at the lower end of the submersible pipe 5, and a radial fixing hole is provided on the fixing portion 56. An elastic column 541 matching the fixing hole is provided on the one-way valve 54, and the elastic column 541 is located in the fixing hole. A plug 542 is provided at the outer end of the elastic column 541 to stop outside the fixing hole. The opening and closing of the one-way valve 54 is realized by the elastic deformation of the elastic column 541. When the ground is drained, the water flow impacts the one-way valve 54 to open the one-way valve 54, and the elastic column 541 is elastically deformed; the elastic deformation of the elastic column 541 can provide a reset force.

[0066] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A water-sealed floor drain, comprising a floor drain core with a closed bottom, and a submersible pipe sleeved in the floor drain core, a water discharge hole being provided in the middle and upper part of the floor drain core, and a lower end of the submersible pipe being lower than the horizontal plane where the water discharge hole is located; characterized in that: The floor drain core can be extended and retracted up and down as the amount of water in it changes; The floor drain core has at least one section of a retractable elastic tube, and drainage holes are arranged at intervals in the circumferential direction of the elastic tube, and the size of the drainage holes changes with the expansion and contraction of the elastic tube; Also includes floor drain foundation groove.

2. The water-sealed floor drain according to claim 1, characterized in that: The floor drain core comprises a first fixed tube and a second fixed tube respectively located above and below the elastic tube, and the first fixed tube and the second fixed tube are respectively sealed and connected to the elastic tube.

3. The water-sealed floor drain according to claim 2, characterized in that: Water discharge holes are arranged at intervals in the circumferential direction of the first fixed pipe.

4. The water-sealed floor drain according to claim 2, characterized in that: A flexible limiting member for limiting the maximum telescopic length of the elastic tube is provided between the first fixing tube and the second fixing tube.

5. The water-sealed floor drain according to claim 4, characterized in that: The flexible limiting member is a plurality of limiting strips arranged at intervals, the upper ends of the limiting strips are fixed on the first fixed tube, and the lower ends of the limiting strips are fixed on the second fixed tube.

6. The water-sealed floor drain according to any one of claims 1 to 5, characterized in that: An axial partition is provided in the submersible pipe, and the partition divides the space inside the submersible pipe into a first drainage passage for draining water from the washing machine and a second drainage passage for draining water from the ground.

7. The water-sealed floor drain according to claim 6, characterized in that: A sealing cover for closing the first drainage passage is arranged at the upper end of the submersible pipe, and a nozzle communicating with a drainage pipe is arranged on the sealing cover.

8. The water-sealed floor drain according to any one of claims 1 to 5, characterized in that: A drain outlet communicated with a sewer pipe is arranged at the bottom of the floor drain base groove, and a floor drain core and a submersible pipe are arranged in a suited manner and sealed and fixed at the drain outlet.

Images