A toilet bottom jet flush backflow assembly

Abstract

The utility model discloses a kind of toilet bottom jet flushes backflow components, belong to the technical field of toilet, including the drain outlet located at the bottom of water storage tank, with the flush connector of mechanical valve outlet end connection, backflow connector and water pipe connector;The water pipe connector is fixedly installed in the outside of the drain outlet, the backflow connector is fixedly installed in the inside of the drain outlet;The backflow connector one end is connected with the flush connector, the other end is connected with the water pipe connector, the backflow connector side wall is provided with the backflow hole being communicated with water storage tank, the backflow hole is communicated with the inside of the water pipe connector, one-way valve is arranged in the backflow hole, water flow can only flow from water storage tank to the inside of the water pipe connector. Negative pressure generated by bottom high-speed flush flow can suck water in water storage tank, while flush is closed, water flow in water storage tank can be continuously supplied, avoid water hammer effect, and toilet water cannot backflow.

Description

Technical Field

[0001] This utility model relates to the field of toilet technology, and in particular to a toilet bottom jet flushing backflow component. Background Technology

[0002] Chinese patent publication CN114411898A discloses a tankless mechanical valve flushing system, belonging to the field of toilet flushing systems. The system features a main control chamber with a first drain pipe, a second drain pipe, and a water inlet pipe on one side. A flow channel switching mechanism connects the first and second drain pipes. When the main control piston moves towards the activation chamber, the first drain pipe connects to the water inlet pipe. A water passage chamber is provided on the main control piston, and a switching control water channel is connected to the other end of the main control chamber. When the main control piston resets, the water passage chamber connects the switching control water channel to the water inlet pipe, driving the flow channel switching mechanism to connect the second drain pipe to the water inlet pipe. A delay setting in the activation chamber allows a single trigger to control the main control piston to complete one reciprocating motion. During this motion, the main control piston controls the flow channel switching mechanism to switch the water outlet pipe, thereby driving the water flow to complete the entire process of outer ring flushing, jet flushing, and outer ring secondary flushing and water storage. The entire process is completed through mechanical force and does not rely on the electricity of a water tank.

[0003] When the mechanical valve is working, some water will be discharged into the water tank. Because the flush valve is placed at a low position, this water cannot be discharged directly into the toilet by gravity and requires active force to discharge it. Summary of the Invention

[0004] To address the aforementioned problems, this utility model aims to solve the problems described above. One objective of this utility model is to provide a toilet bottom jet flushing backflow assembly that solves the problems mentioned above.

[0005] The present invention provides a toilet bottom jet flushing and return assembly, comprising a drain outlet located at the bottom of a water tank, a flushing connector connected to the outlet of a mechanical valve, a return connector, and a water pipe connector; the water pipe connector is fixedly installed on the outside of the drain outlet, and the return connector is fixedly installed on the inside of the drain outlet. One end of the return connector is connected to the flush connector, and the other end is connected to the water pipe connector. The side wall of the return connector is provided with a return hole that communicates with the water storage tank. The return hole communicates with the inside of the water pipe connector. A one-way valve is provided in the return hole, so that water can only flow from the water storage tank to the inside of the water pipe connector.

[0006] A preferred technical solution is that a return ring is provided in the middle of the return connector, the return ring is fixed to the inner end of the drain outlet, a first sealing ring is provided between the return ring and the inner wall of the drain outlet, the return hole passes through the return ring, a return cavity is provided between the return ring and the end of the water pipe connector, the return cavity is connected to the inside of the water pipe connector, and the one-way valve is located in the return cavity.

[0007] A preferred technical solution is that the one-way valve is a rubber sealing ring, the rubber sealing ring includes a fixing ring and an elastic diaphragm portion, the elastic diaphragm portion extends outward from the fixing ring, the fixing ring is fixed to the reflux connector, the elastic diaphragm portion is attached to the end of the reflux ring, and the elastic diaphragm portion closes the reflux hole.

[0008] A preferred technical solution is that the thickness of the elastic film portion is 1-2 mm, and a protrusion is provided on the outermost side of the elastic film portion near the fixing ring, the protrusion abutting against the cross-section of the fixing ring.

[0009] A preferred technical solution is that the water pipe connector has a groove on the inner side of the end near the return connector, and the return connector has a snap-fit ​​part on the outer side of the same end. During installation, the snap-fit ​​part snaps into the groove; the groove connects the return cavity with the interior of the water pipe connector.

[0010] A preferred technical solution is that the outermost side of the water pipe connector is provided with a limiting part, which abuts against the outer end of the drain outlet; the outermost side of the return ring is provided with a limiting flange, which abuts against the inner end of the drain outlet; when the snap-fit ​​part is snapped into the snap-fit ​​groove, the limiting part and the limiting flange are clamped at both ends of the drain outlet.

[0011] A preferred technical solution is that a second sealing ring is provided on the outer side of the end of the water pipe connector, and when the end of the water pipe connector is inserted into the drain outlet, the limiting part abuts against the outer end of the drain outlet.

[0012] Compared with the prior art, the toilet bottom jet flushing backflow component of this utility model has the following technical effects: 1. This application discloses a toilet bottom jet flushing and backflow assembly, comprising a drain outlet located at the bottom of the water tank, a flushing connector connected to the outlet of a mechanical valve, a backflow connector, and a water pipe connector; the water pipe connector is fixedly installed on the outside of the drain outlet, and the backflow connector is fixedly installed on the inside of the drain outlet; one end of the backflow connector is connected to the flushing connector, and the other end is connected to the water pipe connector; the side wall of the backflow connector is provided with a backflow hole communicating with the water tank, the backflow hole communicating with the inside of the water pipe connector, and a one-way valve is provided in the backflow hole, allowing water to flow only from the water tank to the inside of the water pipe connector. The negative pressure generated by the high-speed flushing flow at the bottom draws water out of the water tank, while the water supply to the water tank continues even when the flush is closed, avoiding water hammer and preventing backflow of toilet water.

[0013] Other features and advantages of the present invention will become clear when reading the following description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the toilet bottom jet flushing return component provided in a specific embodiment of this utility model; In the picture: 1. Water storage tank; 2. Drain outlet; 3. Flushing connector; 4. Return connector; 5. Water pipe connector; 41. Return hole; 42. Check valve; 43. Return ring; 44. First sealing ring; 45. Return chamber; 421. Fixing ring; 422. Elastic membrane part; 423. Protrusion; 46. Snap-fit ​​part; 431. Limiting flange; 51. Slot part; 52. Limiting part; 53. Second sealing ring. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0017] The following description, in conjunction with the accompanying drawings and embodiments, details the bottom jet flushing return assembly of the toilet.

[0018] like Figure 1 As shown, a toilet bottom jet flushing and backflow assembly includes a drain outlet 2 at the bottom of a water tank 1, a flushing connector 3 connected to the outlet of a mechanical valve, a backflow connector 4, and a water pipe connector 5. The water pipe connector 5 is fixedly installed on the outside of the drain outlet 2, and the backflow connector 4 is fixedly installed on the inside of the drain outlet 2. One end of the backflow connector 4 is connected to the flushing connector 3, and the other end is connected to the water pipe connector 5. The side wall of the backflow connector 4 is provided with a backflow hole 41 communicating with the water tank 1. The backflow hole 41 communicates with the inside of the water pipe connector 5, and a one-way valve 42 is provided in the backflow hole 41, allowing water to flow only from the water tank 1 into the inside of the water pipe connector 5. This assembly is installed as an integrated module on the reserved drain outlet 2 at the bottom of the water tank 1. The flushing connector 3 is connected to the outlet of the upstream mechanical valve to receive high-pressure flushing water. The backflow connector 4 is a core functional component, and its internal flow channel forms the throat of a Venturi tube. When the high-pressure water flow enters the return connector 4 from the flush connector 3, the flow velocity quickly decreases, causing a localized negative pressure zone. This negative pressure zone acts on the inside of the water storage tank 1 through the return hole 41 on the side wall of the return connector 4. The one-way valve 42 installed in the return hole 41 is normally closed. When negative pressure is formed, the combined action of the external atmospheric pressure and the water pressure inside the water storage tank 1 overcomes the closing force of the one-way valve 42, causing it to open. Water in the water storage tank 1 is then drawn into the negative pressure zone, mixed with the main high-speed water flow from the mechanical valve, and together accelerated through the water pipe connector 5 and sprayed towards the jet hole at the bottom of the toilet. This design integrates the jet pump principle into a compact connector assembly. It uses a small stream of high-pressure water as power to generate negative pressure, actively drawing in and driving a larger volume of water in the water storage tank 1 to participate in flushing, thus effectively amplifying the flow rate. This not only significantly improves the flushing force and cleaning effect of the bottom jet, but also reduces the direct dependence on instantaneous water flow and pressure while ensuring flushing efficiency, demonstrating excellent water-saving potential. The one-way valve 42 ensures unidirectional water flow, completely preventing sewage from backflowing through the jet path and contaminating the water storage tank 1.

[0019] The preferred technical solution for the internal structure and sealing of the return connector 4 is as follows: a return ring 43 is provided in the middle of the return connector 4. The return ring 43 is fixed to the inner end of the drain outlet 2. A first sealing ring 44 is provided between the return ring 43 and the inner wall of the drain outlet 2. The return hole 41 penetrates the return ring 43. A return cavity 45 is provided between the return ring 43 and the end of the water pipe connector 5. The return cavity 45 communicates with the inside of the water pipe connector 5. The one-way valve 42 is located in the return cavity 45. The return ring 43 is a radially protruding annular structure on the return connector 4. During installation, the return ring 43 is inserted into the drain outlet 2 from inside the water storage tank 1, and radial sealing is achieved with the inner wall of the drain outlet 2 through the first sealing ring 44 to prevent water from the water storage tank 1 from leaking from the circumference of the interface. The return hole 41 is opened on the ring body of the return ring 43, becoming a channel connecting the water storage tank 1 and the return cavity 45. The reflux chamber 45 is a flat, annular cavity formed between the end face of the reflux ring 43 and the inlet end face of the water pipe connector 5. This cavity is connected to the main water flow channel through the inlet of the water pipe connector 5. The one-way valve 42 is installed in this reflux chamber 45, covering the outlet end of the reflux hole 41. The design of the reflux ring 43 integrates connection, sealing, and functional holes into one unit. The first sealing ring 44 provides a reliable static seal, preventing potential leakage at the installation site. The independent reflux chamber 45 structure provides a clear installation position and a stable working environment for the one-way valve 42, ensuring that negative pressure can effectively act on the one-way valve 42 and that the sucked-in water flow can smoothly merge into the main flow channel.

[0020] The specific implementation and working characteristics of the one-way valve 42 are as follows: the one-way valve 42 is a rubber sealing ring, which includes a retaining ring 421 and an elastic diaphragm portion 422. The elastic diaphragm portion 422 extends outward from the retaining ring 421, which is fixed to the reflux connector 4. The elastic diaphragm portion 422 adheres to the end of the reflux ring 43, and seals the reflux hole 41. The one-way valve 42 is made of a single molded rubber component. The retaining ring 421 is fixed to the valve seat position on the reflux connector 4 by an interference fit. The elastic diaphragm portion 422 is a thin and flexible rubber membrane. Its free end, in its natural state, adheres smoothly to the end face of the reflux ring 43 by the elasticity of the material or a small pretension, completely covering the outlet of the reflux hole 41 to form a seal. When the pressure inside the return chamber 45 falls below the pressure on the water storage tank 1 side due to the Venturi effect, the pressure difference pushes the elastic diaphragm part 422 to bulge and deform towards the return chamber 45, opening the channel to allow water to flow through. When the pressure difference disappears or reverses, the elastic diaphragm part 422 quickly returns to its flat state and re-seals under its own elastic restoring force and the action of any possible positive pressure. It is integrally molded from rubber material, resulting in an extremely simple structure, low cost, and the excellent elasticity and sealing properties of rubber. The elastic diaphragm part 422 has a fast response speed, instantly reacting to even slight negative pressures, resulting in high suction efficiency. Its closing also relies on automatic elastic reset, eliminating the need for an additional spring, ensuring reliable operation and a long service life.

[0021] The optimized design of the elastic diaphragm portion 422 involves a thickness of 1-2 mm. A protrusion 423 is provided on the outermost side of the elastic diaphragm portion 422 closest to the fixing ring 421, and this protrusion 423 abuts against the cross-section of the fixing ring 421. The 1-2 mm thickness is a carefully chosen balance: too thin a thickness results in insufficient mechanical strength, making it prone to tearing or permanent deformation; too thick a thickness leads to excessive opening resistance, affecting suction sensitivity. This thickness range maintains good opening sensitivity while ensuring sufficient service life. The protrusion 423 is designed at the root of the elastic diaphragm portion 422. In the naturally closed state, the protrusion 423 contacts the end face of the fixing ring 421, forming a mechanical limiting support to ensure accurate reset each time. The optimized thickness ensures a balance between valve performance and durability. The protrusion 423 is crucial in several ways: First, it provides support when the membrane is closed, preventing fatigue creases or stress concentration at the membrane root due to long-term water pressure, thus greatly extending the fatigue life of the membrane. Second, it limits the minimum curvature of the membrane when closed, helping to maintain its flat fit and improving the reliability of the seal. Third, it ensures that when the membrane is opened, deformation mainly occurs in areas outside the protrusion 423, resulting in smoother operation.

[0022] The preferred technical solution for quick connection and fluid communication between connectors is that the inner side of the end of the water pipe connector 5 near the return connector 4 is provided with a groove 51, and the outer side of the same end of the return connector 4 is provided with a snap-fit ​​part 46. During installation, the snap-fit ​​part 46 snaps into the groove 51; the groove 51 connects the return cavity 45 and the interior of the water pipe connector 5. The groove 51 consists of multiple spaced arc-shaped grooves on the inner wall of the inlet of the water pipe connector 5. The snap-fit ​​part 46 consists of annular protrusions on the outer wall of the corresponding end of the return connector 4. During installation, the water pipe connector 5 is inserted into the drain outlet 2, the snap-fit ​​part 46 is inserted into the groove 51, and then the water pipe connector 5 is rotated so that the snap-fit ​​part 46 rotates to the limited area of ​​the groove 51. The groove space of the groove 51 itself constitutes part of the return cavity 45, which is the position when the snap-fit ​​part 46 is first inserted. This position connects the return cavity 45 and the interior of the water pipe connector 5 after installation and is the main channel for return flow.

[0023] The overall component installation, fixing, and limiting scheme is as follows: the outermost side of the water pipe connector 5 is provided with a limiting part 52, which abuts against the outer end of the drain outlet 2; the outermost side of the return ring 43 is provided with a limiting flange 431, which abuts against the inner end of the drain outlet 2; when the snap-fit ​​part 46 is snapped into the snap-fit ​​groove part 51, the limiting part 52 and the limiting flange 431 are clamped at both ends of the drain outlet 2. The limiting part 52 is a radially protruding shoulder on the water pipe connector 5. The limiting flange 431 is a radially protruding edge on the return ring 43. The wall thickness of the drain outlet 2 is between these two limiting structures. When the return connector 4 is inserted into the drain outlet 2 from the inside, and the water pipe connector 5 is inserted from the outside and locked to the return connector 4 through the slot 51, the locking force will drive the limiting part 52 of the water pipe connector 5 to press against the outer end face of the drain outlet 2. At the same time, the reaction force is transmitted to the return connector 4 through the snap-fit ​​structure, causing its limiting flange 431 to press against the inner end face of the drain outlet 2. Thus, the wall thickness of the drain outlet 2 is firmly clamped between the two limiting structures. This bidirectional limiting clamping structure, combined with the snap-fit ​​connection, achieves an extremely stable mechanical fixation of the component on the drain outlet 2, which can effectively resist the vibration and axial force generated by the water flow impact and prevent the component from loosening. After installation, the component and the water storage tank 1 form a rigidly connected whole, and the sealing and reliability are doubly guaranteed. The entire installation process is simple, fast and the result is firm, making it very suitable for industrial production and on-site installation.

[0024] A second sealing ring 53 is provided on the outer side of the end of the water pipe connector 5. When the end of the water pipe connector 5 is inserted into the drain outlet 2, the limiting part 52 abuts against the outer end of the drain outlet 2. An annular sealing ring mounting groove is machined on the outer surface of the cylindrical end of the water pipe connector 5 used for insertion into the drain outlet 2, and the second sealing ring 53 is installed in this groove. During final assembly, this end of the water pipe connector 5 is aligned with and inserted into the drain outlet 2 from the outside of the water storage tank 1. During insertion, the outer circumferential surface of the second sealing ring 53 forms an interference fit with the inner wall of the drain outlet 2 and is moderately compressed, thereby forming a tight, annular elastic sealing barrier in the radial direction. The limiting part 52 acts as a step on the water pipe connector 5, and its designed position precisely corresponds to the correct insertion depth of the water pipe connector 5 into the drain outlet 2. When the water pipe connector 5 is inserted until the limiting part 52 is in close contact with and abuts against the outer end face of the drain outlet 2, it indicates that the installation is in place. At this time, the second sealing ring 53 is exactly located in the designed position inside the drain outlet 2, in the optimal compression and working state. Together with the seal achieved by the first sealing ring 44 located inside the drain outlet 2 and on the return ring 43, it forms a double sealing protection system. The abutment design between the limiting part 52 and the outer end of the drain outlet 2 not only plays a role in axial positioning, but also indirectly ensures that the second sealing ring 53 is inserted to the preset depth and position.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes that element.

[0026] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. The utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A toilet bottom jet flushing backflow assembly, characterized in that: It includes a drain outlet located at the bottom of the water storage tank, a flushing connector connected to the water outlet of the mechanical valve, a return connector, and a water pipe connector; the water pipe connector is fixedly installed on the outside of the drain outlet, and the return connector is fixedly installed on the inside of the drain outlet. One end of the return connector is connected to the flush connector, and the other end is connected to the water pipe connector. The side wall of the return connector is provided with a return hole that communicates with the water storage tank. The return hole communicates with the inside of the water pipe connector. A one-way valve is provided in the return hole, so that water can only flow from the water storage tank to the inside of the water pipe connector.

2. The toilet bottom jet flushing backflow assembly as described in claim 1, characterized in that: A return ring is provided in the middle of the return connector. The return ring is fixed to the inner end of the drain outlet. A first sealing ring is provided between the return ring and the inner wall of the drain outlet. The return hole passes through the return ring. A return cavity is provided between the return ring and the end of the water pipe connector. The return cavity is connected to the inside of the water pipe connector. The one-way valve is located in the return cavity.

3. The toilet bottom jet flushing backflow assembly as described in claim 2, characterized in that: The one-way valve is a rubber sealing ring, which includes a fixing ring and an elastic diaphragm portion. The elastic diaphragm portion extends outward from the fixing ring. The fixing ring is fixed to the reflux connector. The elastic diaphragm portion is attached to the end of the reflux ring and closes the reflux hole.

4. The toilet bottom jet flushing backflow assembly as described in claim 3, characterized in that: The elastic film portion has a thickness of 1-2 mm, and a protrusion is provided on the outermost side of the elastic film portion near the fixing ring, the protrusion abutting against the cross-section of the fixing ring.

5. The toilet bottom jet flushing backflow assembly as described in claim 2, characterized in that: The water pipe connector has a groove on the inner side of the end near the return connector, and the return connector has a snap-fit ​​part on the outer side of the same end. During installation, the snap-fit ​​part snaps into the groove. The groove connects the return cavity with the interior of the water pipe connector.

6. The toilet bottom jet flushing backflow assembly as described in claim 5, characterized in that: The outermost side of the water pipe connector is provided with a limiting part, which abuts against the outer end of the drain outlet. The outermost side of the return ring is provided with a limiting flange, which abuts against the inner end of the drain outlet. When the snap-fit ​​part is snapped into the snap-fit ​​groove, the limiting part and the limiting flange clamp the two ends of the drain outlet.

7. The toilet bottom jet flushing backflow assembly as described in claim 6, characterized in that: A second sealing ring is provided on the outer side of the end of the water pipe connector. When the end of the water pipe connector is inserted into the drain outlet, the limiting part abuts against the outer end of the drain outlet.

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