CN213014545U - Low cistern closet - Google Patents

Abstract

The utility model discloses a low water tank toilet bowl, including the toilet bowl body, be equipped with the urinal that falls on the toilet bowl body, the urinal bottom of falling is equipped with the heavy water bay, and the heavy water bay is connected with the blowdown siphon. The toilet bowl body is provided with a water tank on one side of the toilet bowl, and a first drain valve and a second drain valve are respectively arranged at the bottom of the water tank. The top of the urinal is provided with a brushing pipeline for cleaning the peripheral wall of the urinal, one side of the brushing pipeline, which is close to the water tank, is communicated with the water outlet of the first drainage valve through a first water guide channel, and the top of the water tank is higher than the brushing pipeline. The inside injection pipeline that is used for washing the urinal bottom that falls that is equipped with of toilet bowl body, the one end of injection pipeline is linked together through the outlet of second water guide channel with the second drain valve. The utility model discloses a control the discharge capacity of first drain valve and second drain valve, can rationally distribute the water yield to the inside mutually independent setting of toilet bowl scrub the pipeline and spray the pipeline in, the flushing effect is good and does not waste water.

Description

Low cistern closet

Technical Field

The utility model relates to a bathroom field, in particular to low water tank toilet bowl.

Background

The water tank of the existing low-water-tank toilet bowl is generally low, the amount of water stored in the water tank higher than a washing hole is small, and the position of the injection pipeline is low, so that when the water tank is flushed, water flow can preferentially run into the injection pipeline, and the amount of water applied to washing of a bedpan is small and small. Therefore, the existing low-water-tank toilet bowl generally has the problems of incomplete washing, short washing time and less washing water quantity, so that the low-water-tank toilet bowl has poor washing effect. If the water tank is heightened or enlarged in order to improve the flushing effect, the problems of material waste, complicated manufacturing process and water consumption increase are inevitably caused, and the design of 'energy conservation, environmental protection and material conservation' of the low-water-tank toilet bowl is avoided.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a low water tank toilet that can fully ensure the washing effect without wasting water.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

a low water tank toilet bowl comprises a toilet bowl body, wherein a toilet bowl is arranged on the toilet bowl body, a submerged bay is arranged at the bottom of the toilet bowl, and the submerged bay is connected with a sewage siphon. The toilet bowl body is arranged on one side of the toilet bowl, and a first drain valve and a second drain valve are respectively installed at the bottom of the water tank. The top of the urinal is provided with a brushing pipeline for cleaning the peripheral wall of the urinal, one side of the brushing pipeline, which is close to the water tank, is communicated with the water outlet of the first drainage valve through a first water guide channel, and the top of the water tank is higher than the brushing pipeline. The toilet bowl is characterized in that a spraying pipeline used for flushing the bottom of a toilet bowl is arranged in the toilet bowl body, and one end of the spraying pipeline is communicated with a water outlet of the second drain valve through a second water guide channel.

In one embodiment, the brushing pipeline is an annular pipe with closed side edges, and a plurality of flushing holes facing the peripheral wall of the urinal are uniformly distributed at the bottom of the annular pipe along the circumferential direction.

In another embodiment, the scrubbing pipe is an annular water guide groove with an opening at the inner side, and one side of the first water guide channel is provided with a first rotary punching jet orifice communicated with the annular water guide groove.

Preferably, in order to further improve the washing effect, a circle of water conveying pipeline is arranged outside the annular water guide groove. The water conveying pipeline is provided with a scrubbing water inlet communicated with the first water guide channel on one side close to the first rotary-flushing jet orifice, and is provided with a second rotary-flushing jet orifice communicated with the annular water guide groove on the opposite side of the scrubbing water inlet. The direction of the second rotary-blow jet orifice is the same as the flow direction of the washing water of the annular water guide groove.

Further, the second drain valve include valve body, valve rod, bottom plate, spacing spring and stagnant water cushion. The water discharging cavity is formed in the valve body, the water inlet hole used for communicating the water tank with the water discharging cavity is formed in the top of the valve body, the valve rod is arranged at the top of the valve body, and the bottom end of the valve rod extends into the water discharging cavity and can move up and down. The top of bottom plate sets firmly a connecting portion perpendicularly, connecting portion with the bottom fixed connection of valve rod. An overflow channel which completely penetrates through the valve rod, the connecting part and the bottom plate is formed in the valve rod along the axis. The water stop rubber mat is fixedly installed at the top of the bottom plate, a first annular plate is fixedly arranged at the bottom of the top plate of the valve body along the edge of the water inlet hole, and the top of the water stop rubber mat is in sealing fit with the bottom of the first annular plate. The limiting spring is arranged at the top of the valve body and is in a compressed state, and the upper end of the limiting spring upwards supports against the valve rod.

Further, the lower part outside cover of valve rod is equipped with a stand pipe, the stand pipe is fixed through a plurality of spinal branch vaulting poles the inlet opening top, the inner wall lower part of stand pipe is equipped with a spacing step, and the valve rod outer wall is in the top of spacing step is equipped with an annular butt portion. The limiting spring is arranged between the outer wall of the valve rod and the inner wall of the guide pipe, the lower part of the limiting spring is abutted against the limiting step, and the upper part of the limiting spring is abutted against the annular abutting part.

Furthermore, a counterweight cylinder with an opening at the top is installed on the upper part of the valve rod, a water drainage hole is formed in a bottom plate of the counterweight cylinder, and a connecting pipe for the valve rod to penetrate through is fixedly arranged on the central axis of the counterweight cylinder. The inner wall surface of the connecting pipe is provided with an internal thread, and the outer wall surface of the valve rod is provided with an external thread matched with the internal thread.

Preferably, an annular water baffle plate hermetically communicated with the water drainage hole is fixedly arranged in the counterweight cylinder, a water drainage notch is formed in the side edge of the annular water baffle plate, and an adjusting rod capable of rotating along the axis and used for adjusting the water drainage speed is hermetically arranged in the annular water baffle plate. A water drainage channel is formed in the lower portion inside the adjusting rod, a water drainage opening used for communicating the water passing notch and the water drainage channel is formed in the side wall of the adjusting rod, and the opening area of the water drainage opening is gradually reduced along the side wall of the adjusting rod.

Preferably, the bottom of the overflow channel is provided with an overflow assembly for sealing the overflow channel. The overflow assembly comprises a guide post arranged at the axis of the bottom of the overflow channel, an overflow bottom plate horizontally fixed at the bottom of the guide post, an overflow sealing rubber mat arranged above the overflow bottom plate and used for sealing the bottom of the overflow channel, and an overflow spring sleeved outside the guide post and upwards abutted against the guide post. And a second annular plate is fixedly arranged at the bottom of the overflow bottom plate along the edge of the overflow channel, and the top of the overflow sealing rubber gasket is in sealing fit with the bottom of the second annular plate. The center of the second annular plate is provided with a connecting lug for the guide post to pass through, and the side edge of the connecting lug is fixedly connected with the inner wall of the second annular plate through a plurality of connecting posts. A buckle is fixed on the upper portion of the guide post in a clamping mode, the lower portion of the overflow spring abuts against the connecting lug, and the upper portion of the overflow spring abuts against the buckle.

Furthermore, a locking assembly fixedly connected with the bottom of the water tank is installed below the inside of the drainage cavity. The locking assembly comprises a fixing rod, a screw and a U-shaped hook, the fixing rod is transversely fixed at the bottom of the drainage cavity, a mounting hole for the screw to penetrate through is formed in the fixing rod, and the U-shaped hook is arranged below the valve body and is in threaded connection with the screw.

The utility model discloses following beneficial effect has:

1. after the first drainage valve is opened, water with high liquid level and high potential energy in the water tank flows out through a drainage outlet at the bottom of the first drainage valve and flows into the scrubbing pipeline through the first water guide channel to flush the peripheral wall of the urinal, so that the flushing effect is good; when the water level of the water tank is reduced to a certain height, the second drainage valve is triggered to open, and the residual water in the water tank flows out through a drainage port at the bottom of the second drainage valve and flows into the jet pipeline through a second water guide channel to flush the bottom of the urinal; through the discharge capacity of control first drain valve and second drain valve, can rationally distribute the water yield to the toilet bowl scrub the pipeline and spray in the pipeline, wash the effect good and do not waste water.

2. By installing the overflow assembly at the bottom of the overflow channel of the second drain valve, the injection pipeline is isolated from being communicated with the outside air through the overflow channel. Therefore, when the second drain valve drains water, because the air pressure in the injection pipeline is less than the air pressure of the outside air, the injection pipeline can pre-store water after flushing water at every time, and when the bottom of the toilet is flushed next time, the pre-stored water in the injection pipeline can directly act on the siphon pipeline, so that the stroke of water is saved, and the flushing effect can be greatly improved.

3. Through set up the counter weight section of thick bamboo of upper and lower position adjustable on the second drain valve, the displacement of automatic drain valve is controlled at the position height of valve rod to the accessible control counter weight section of thick bamboo, easy operation, convenient and practical.

4. The adjusting rod is arranged in the water drainage hole of the counterweight cylinder, so that the water drainage speed of the counterweight cylinder can be controlled by rotating the adjusting rod, and the water drainage quantity of the automatic water drainage valve can be controlled.

Drawings

Fig. 1 is a schematic perspective view of a toilet bowl according to a first embodiment.

Fig. 2 is a schematic top view of fig. 1.

Fig. 3 is a schematic sectional view taken along the direction a-a in fig. 2.

Fig. 4 is a schematic cross-sectional view taken along the direction B-B in fig. 2.

Fig. 5 is a schematic view of the internal structure of the toilet bowl body according to the first embodiment.

Fig. 6 is a schematic cross-sectional view taken along the direction C-C in fig. 5.

Fig. 7 is an exploded view of parts of the second water discharge valve.

Fig. 8 is a schematic view of the internal structure of the second drain valve.

Fig. 9 is a partially enlarged schematic view of a portion a in fig. 8.

Fig. 10 is a top view of the overflow floor.

Fig. 11 is a schematic view when the second drain valve is opened.

Fig. 12 is a schematic view of the second drain valve at the time of overflow.

Fig. 13 is a perspective view of a toilet bowl according to the second embodiment.

Fig. 14 is a schematic top view of a toilet bowl body according to the second embodiment.

Fig. 15 is a schematic cross-sectional view taken along direction D-D of fig. 14.

Fig. 16 is a schematic cross-sectional view taken along the direction E-E in fig. 15.

Description of the main component symbols: 100. a toilet body; 101. dropping the urinal; 102. a sink bay; 103. a blowdown siphon tube; 104. A water tank; 105. an annular tube; 106. a first water guide channel; 107. flushing the hole; 108. an injection duct; 109. a second water guide channel; 110. an annular diversion trench; 111. a first spinning jet; 112. a water delivery pipeline; 113. brushing the water inlet; 114. A second spinning jet; 1. a first drain valve; 2. a second drain valve; 200. sealing the rubber gasket; 201. a water inlet hole; 202. A support bar; 203. a limiting step; 204. an annular abutment; 205. a first annular plate; 206. an overflow channel; 207. a protrusion; 208. fixing the clamping groove; 209. a first hanging chain; 21. a valve body; 210. a drainage cavity; 211. a base body; 212. installing a cover; 22. a valve stem; 220. a guide tube; 23. a limiting spring; 24. a water stop rubber mat; 25. a base plate; 26. a connecting portion; 27. A counterweight cylinder; 270. a water drain hole; 271. a connecting pipe; 272. an annular water baffle; 273. a water passing notch; 28. adjusting a rod; 280. A drainage channel; 281. a water discharge opening; 29. an overflow pipe; 31. fixing the rod; 310. mounting holes; 32. a screw; 33. a U-shaped hook; 41. a guide post; 42. an overflow floor; 43. an overflow sealing rubber mat; 44. an overflow spring; 45. a second annular plate; 46. Connecting lugs; 47. connecting columns; 48. and (5) buckling.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Example one

As shown in fig. 1 to 6, a low water tank toilet bowl comprises a toilet bowl body 100, a bowl 101 is arranged on the toilet bowl body 100, a sink bay 102 is arranged at the bottom of the bowl 101, and the sink bay 102 is connected with a sewage siphon 103. The toilet bowl body 100 is provided with a water tank 104 at one side of a toilet bowl 101, the lower part of the water tank 104 sinks into the toilet bowl body 100, the bottom of the water tank 104 is respectively provided with a first drain valve 1 and a second drain valve 2, and the first drain valve 1 is a cylinder type drain valve. The top of the urinal 101 is provided with a brushing pipe for cleaning the peripheral wall thereof, the brushing pipe is an annular pipe 105 with a closed side edge, one side of the annular pipe 105 close to the water tank 104 is communicated with the water outlet of the first drain valve 1 through a first water guide channel 106, and the top of the water tank 104 is higher than the annular pipe 105. A plurality of flushing holes 107 facing the peripheral wall of the toilet bowl 101 are uniformly distributed at the bottom of the annular pipe 105 along the circumferential direction. The toilet bowl body 1 is provided with a jet pipe 108 for flushing the bottom of the toilet bowl 101, and one end of the jet pipe 108 is communicated with the water outlet of the second drain valve 2 through a second water guide channel 109.

As shown in fig. 7 to 10, the second drain valve 2 includes a valve body 21, a valve rod 22, a limiting spring 23 and a water stop rubber gasket 24, a water discharge chamber 210 is provided inside the valve body 21, a water inlet 201 for communicating the water tank 104 and the water discharge chamber 210 is provided at the top, and a sealing rubber gasket 200 for sealing and matching with the wall surface of the water tank 104 is fixedly installed at the bottom of the valve body 21. The valve stem 22 is arranged at the top of the valve body 21, and the bottom end of the valve stem 22 extends into the drainage cavity 210 and can move up and down. The outer side of the lower portion of the valve rod 22 is sleeved with a guide pipe 220, the guide pipe 220 is fixed at the top of the water inlet 201 through a plurality of support rods 202, and the guide pipe 220 is concentric with the water inlet 201. The lower part of the inner wall of the guide tube 220 is provided with a limit step 203, and the outer wall of the valve rod 22 is provided with an annular abutting part 204 above the limit step 203. The limit spring 23 is arranged between the outer wall of the valve rod 22 and the inner wall of the guide pipe 220 and is in a compressed state, the lower part of the limit spring 23 is abutted against the limit step 203, and the upper part is abutted against the annular abutting part 204.

The bottom of the top plate of the valve body 21 is fixedly provided with a first annular plate 205 along the edge of the water inlet hole 201, the bottom of the valve rod 22 is fixedly provided with a bottom plate 25, and a water-stopping rubber pad 24 is fixedly arranged on the top of the bottom plate 25 and is in sealing fit with the bottom of the first annular plate 205. The top of the bottom plate 25 is vertically and fixedly provided with a connecting part 26, and the connecting part 26 is in threaded connection with the bottom of the valve rod 22. The stem 22 defines an axial overflow passage 206 extending completely through the stem 22, the connecting portion 26 and the bottom plate 25.

The upper portion of the valve rod 22 is provided with a counterweight cylinder 27 with an open top, and a bottom plate of the counterweight cylinder 27 is provided with one or more drain holes 270 along the circumferential direction. The central axis of the weight cylinder 27 is fixedly provided with a connecting pipe 271 for the valve rod 22 to pass through, the inner wall surface of the connecting pipe 271 is provided with an internal thread, and the outer wall surface of the valve rod 22 is provided with an external thread matched with the internal thread.

An annular water baffle 272 hermetically communicated with the water drainage hole 270 is fixedly arranged in the counterweight cylinder 27, and a water passing notch 273 is formed in the side edge of the annular water baffle 272. The annular water baffle 272 is internally and hermetically provided with an adjusting rod 28 which can rotate along the axis and is used for adjusting the draining speed. A water drainage channel 280 is arranged at the lower part inside the adjusting rod 28, and a water drainage opening 281 for communicating the water passing notch 273 with the water drainage channel 280 is arranged on the side wall of the adjusting rod 28. The opening area of the drain opening 281 is gradually reduced along the side wall of the adjustment lever 28. The discharge speed of the weight cylinder 27 can be controlled by rotating the adjusting rod 28, so that the discharge amount of the first drain valve 2 can be controlled, and the discharge amount of the first drain valve 2 can be controlled by the height of the weight cylinder 27 on the valve rod 22.

The bottom of the overflow channel 206 is provided with an overflow assembly for sealing it. The overflow assembly comprises a guide column 41 arranged at the bottom axis of the overflow channel 206, an overflow bottom plate 42 horizontally fixed at the bottom of the guide column 41, an overflow sealing rubber gasket 43 arranged above the overflow bottom plate 42 and used for sealing the bottom of the overflow channel 206, and an overflow spring 44 sleeved outside the guide column 41 and upwards abutting against the guide column 41. The bottom of the overflow bottom plate 42 is fixedly provided with a second annular plate 45 along the edge of the overflow channel 206, and the top of the overflow sealing rubber gasket 43 is in sealing fit with the bottom of the second annular plate 45. The center of the second annular plate 45 is provided with a connecting lug 46 for the guide post 41 to pass through, and the side edge of the connecting lug 46 is fixedly connected with the inner wall of the second annular plate 45 through a plurality of connecting posts 47. A buckle 48 is clamped and fixed on the upper part of the guide post 41, the lower part of the overflow spring 44 is propped against the lug 46, and the upper part is propped against the buckle 48. When the pressure of the water pressure acting on the overflow sealing rubber gasket 43 and the gravity of the overflow assembly are larger than the elastic force generated by the overflow spring 44, the overflow assembly is opened, and water flows into the base to realize overflow.

A locking assembly for fixedly connecting with the bottom of the water tank 104 is installed at the lower part of the inside of the drain chamber 210, and the locking assembly comprises a fixing rod 31, a screw 32 and a U-shaped hook 33. The fixing rod 31 is transversely fixed at the bottom of the drainage cavity 210, a mounting hole 310 for the screw 32 to pass through is formed in the fixing rod 31, and the U-shaped hook 33 is arranged below the valve body 21 and is in threaded connection with the screw 32.

Valve body 21 includes base body 211 and the installation lid 212 of lock on base body 211, and the junction of installation lid 212 and base body 211 is equipped with sealed cushion 200, and the same high department of lateral wall of base body 211 has set firmly a plurality of arch 207 along circumference, has seted up a plurality of on the lateral wall of installation lid 212 and is used for and protruding 207 joint complex fixed slot 208.

After the first drainage valve 1 is opened, water with high liquid level and high potential energy in the water tank 104 flows out through a drainage port at the bottom of the first drainage valve 1, flows into the annular pipe 105 through the first water guide channel 106 to flush the peripheral wall of the urinal 101, and the flushing effect is good; when the water level of the water tank 104 is lowered to a certain height, the second drain valve 2 is triggered to be opened, and the residual water in the water tank 104 flows out through a drain outlet at the bottom of the second drain valve 2 and flows into the injection pipeline 108 through the second water guide channel 109 to flush the bottom of the toilet bowl 101; by controlling the displacement of the first drain valve 1 and the second drain valve 2, the amount of water can be reasonably distributed into the ring pipe 105 and the injection pipeline 108 of the toilet bowl, the flushing effect is good, and water is not wasted.

Fig. 11 is a schematic view showing when the second drain valve is opened. When the second drain valve 2 of the water tank 104 is opened to drain, the water level drops, when the water level is lower than the drain hole 270 of the counterweight cylinder 27, the counterweight cylinder 27 plays a role in storing water, gravity G1 is generated, and the overall gravity of the counterweight cylinder 27, the valve rod 22, the water stop rubber mat 24, the bottom plate 25 and the connecting part 26 is G2. The limiting spring 23 is in a compressed state and generates elastic force F1, the pressure of the water pressure acting on the water stopping rubber mat 24 is F2, and when G1+ G2+ F2 is greater than F1, the second drain valve 2 is in an open state.

Fig. 12 is a schematic view showing the second drain valve overflowing. When the water inlet valve of the water tank 104 does not stop water and water continuously enters, the water tank 104 overflows, and the overall gravity of the weight cylinder 27, the valve rod 22, the water stop rubber mat 24, the bottom plate 25 and the connecting part 26 is G2. The limiting spring 23 is in a compressed state and generates elastic force F3, the pressure of water pressure acting on the water stopping rubber mat 24 is F4, and when F3 is greater than G2+ F4, the first drain valve 2 is in a closed state. Excess water drains out of the overflow channel 206 to effect overflow. When the pressure of water pressure on the overflow sealing rubber gasket 73 and the gravity of the overflow assembly are larger than the elastic force generated by the overflow spring 74, the overflow assembly is opened, and water flows into the base to realize overflow.

By installing the overflow assembly at the bottom of the overflow passage 206 of the second discharge valve 2, the injection pipe 108 is isolated from the external air through the overflow passage 206. Therefore, when the second drain valve 2 drains water, because the air pressure in the injection pipeline 108 is less than the air pressure of the outside air, the injection pipeline 108 can pre-store water after flushing water at every time, and when the bottom of the toilet is flushed next time, the pre-stored water in the injection pipeline 108 can directly act on the siphon pipeline 103, so that the stroke of water is saved, and the flushing effect can be greatly improved.

Example two

As shown in fig. 13-16, the present embodiment differs from the first embodiment only in that: the scrubbing pipe is an annular water guide groove 110 with an opening at the inner side, and one side of the first water guide channel 106 is provided with a first rotary punching jet orifice 111 communicated with the annular water guide groove 110. A ring of water conveying pipes 112 are arranged outside the annular water guide groove 110. The water pipe 112 is provided with a brushing water inlet 113 communicated with the first water guide channel 106 at one side close to the first rotary-flushing jet orifice 111, and the water pipe 112 is provided with a second rotary-flushing jet orifice 114 communicated with the annular water guide groove 110 at the opposite side of the brushing water inlet 113. The second swirling jet ports 114 are oriented in the same direction as the flow of washing water of the annular gutter 110. The rest of the structure of the present embodiment is the same as that of the first embodiment.

After the second drain valve 2 is opened, the water in the water tank 104 flows into the annular water guide groove 110 through the first water guide channel 106, and is finally sprayed out by the first and second whirling jet openings 111 and 114, and the sprayed water is guided by the annular water guide groove 110 to clean the peripheral wall of the urinal 101. The directions of the first rotary-blow jet orifice 111 and the second rotary-blow jet orifice 114 are the same as the flow direction of the flushing water of the annular water diversion groove 110, the flushing water at the two sides flows along the same direction of the water flow, the peripheral wall of the urinal 101 is flushed in a spiral manner, and the flushing effect is good. The rest of the principle of the embodiment is the same as that of the first embodiment.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides a low water tank toilet bowl, includes the toilet bowl body, be equipped with the urinal that falls on the toilet bowl body, the urinal bottom of falling is equipped with the heavy water bay, and the heavy water bay is connected with blowdown siphon, its characterized in that: the toilet bowl comprises a toilet bowl body and is characterized in that a water tank is arranged on one side of the toilet bowl body, a first drain valve and a second drain valve are respectively installed at the bottom of the water tank, a scrubbing pipeline used for cleaning the peripheral wall of the toilet bowl body is arranged at the top of the toilet bowl body, one side, close to the water tank, of the scrubbing pipeline is communicated with a drain outlet of the first drain valve through a first water guide channel, the top of the water tank is higher than the scrubbing pipeline, a jet pipeline used for flushing the bottom of the toilet bowl body is arranged inside the toilet bowl body, and one end of the jet pipeline is communicated with a drain outlet of the second drain valve through a.

2. The low tank toilet bowl of claim 1, wherein: the scrubbing pipeline is an annular pipe with a sealed side edge, and a plurality of flushing holes facing the circumferential wall of the urinal are uniformly distributed at the bottom of the annular pipe along the circumferential direction.

3. The low tank toilet bowl of claim 1, wherein: the scrubbing pipeline is an annular water guide groove with an opening at the inner side, and one side of the first water guide channel is provided with a first rotary-impacting jet orifice communicated with the annular water guide groove.

4. The low tank toilet bowl of claim 3, wherein: the outer side of the annular water diversion groove is provided with a circle of water delivery pipeline, one side of the water delivery pipeline close to the first rotary flushing jet opening is provided with a scrubbing water inlet communicated with the first water diversion channel, the opposite side of the water delivery pipeline at the scrubbing water inlet is provided with a second rotary flushing jet opening communicated with the annular water diversion groove, and the direction of the second rotary flushing jet opening is the same as the flow direction of flushing water of the annular water diversion groove.

5. The low tank toilet bowl of claim 1, wherein: the second drain valve comprises a valve body, a valve rod, a bottom plate, a limiting spring and a water stop rubber gasket, wherein a drainage cavity is formed in the valve body, a water inlet hole for communicating the water tank with the drainage cavity is formed in the top of the valve body, the valve rod is arranged at the top of the valve body, the bottom end of the valve rod extends into the drainage cavity and can move up and down, a connecting part is fixedly and vertically arranged at the top of the bottom plate and is fixedly connected with the bottom of the valve rod, an overflow channel which completely penetrates through the valve rod, the connecting part and the bottom plate is formed in the valve rod along the axis, the water stop rubber gasket is fixedly arranged at the top of the bottom plate, a first annular plate is fixedly arranged at the bottom of a top plate of the valve body along the edge of the water inlet hole, the top of the water stop rubber gasket is in sealing fit with the bottom of the, the upper end of the limiting spring is upwards propped against the valve rod.

6. The low tank toilet bowl of claim 5, wherein: the lower part outside cover of valve rod is equipped with a stand pipe, the stand pipe is fixed through a plurality of spinal branch vaulting poles the inlet opening top, the inner wall lower part of stand pipe is equipped with a spacing step, and the valve rod outer wall is in the top of spacing step is equipped with an annular butt portion, spacing spring is established between valve rod outer wall and stand pipe inner wall, and spacing spring's lower part supports spacing step, upper portion support annular butt portion.

7. The low tank toilet bowl of claim 5, wherein: the balance weight comprises a valve rod, a balance weight barrel and a water drainage hole, wherein the top of the balance weight barrel is provided with an opening, the bottom plate of the balance weight barrel is provided with the water drainage hole, the central axis of the balance weight barrel is fixedly provided with a connecting pipe for the valve rod to penetrate through, the inner wall surface of the connecting pipe is provided with an internal thread, and the outer wall surface of the valve rod is provided with an external thread matched with the internal thread.

8. The low tank toilet bowl of claim 7, wherein: the balance weight cylinder is characterized in that an annular water baffle which is in sealed communication with the water drainage hole is fixedly arranged inside the balance weight cylinder, a water passing notch is formed in the side edge of the annular water baffle, an adjusting rod which can rotate along the axis and is used for adjusting the water drainage speed is installed inside the annular water baffle in a sealed mode, a water drainage channel is formed in the lower portion inside the adjusting rod, a water drainage opening which is used for communicating the water passing notch with the water drainage channel is formed in the side wall of the adjusting rod, and the opening area of the water drainage opening is gradually reduced along the side wall of the adjusting rod.

9. The low tank toilet bowl of claim 5, wherein: the overflow channel bottom is provided with an overflow assembly for sealing the overflow assembly, the overflow assembly comprises a guide post arranged at the axis of the bottom of the overflow channel, an overflow bottom plate fixed at the bottom of the guide post horizontally, an overflow sealing rubber mat arranged above the overflow bottom plate and used for sealing the bottom of the overflow channel, and an overflow spring sleeved outside the guide post and upwards abutting against the guide post, the bottom of the overflow bottom plate is fixedly provided with a second annular plate along the edge of the overflow channel, the top of the overflow sealing rubber mat is in sealing fit with the bottom of the second annular plate, the center of the second annular plate is provided with a connecting lug for the guide post to pass through, the side edge of the connecting lug is fixedly connected with the inner wall of the second annular plate through a plurality of connecting posts, the upper part of the guide post is clamped and fixed with a buckle, and the lower part of the overflow spring abuts against the connecting lug, the upper part is propped against the buckle.

10. The low tank toilet bowl of claim 5, wherein: the utility model discloses a water tank, including water tank bottom, water drainage chamber, water tank bottom, water drainage chamber's inside below is installed and is used for paying the subassembly with water tank bottom fixed connection's lock, the lock pay the subassembly and include dead lever, screw and U type hook, the dead lever transversely is fixed in water drainage chamber bottom, has seted up the confession on the dead lever the mounting hole that the screw passed, the U type hook establish valve body below and with screw threaded connection.

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