Anti-siphon water inlet connector, flushing valve and squatting pan
By designing anti-siphon water inlet joints and using the structure of the adjustment screw and slide rod assembly, the anti-siphon and flow adjustment functions of the flush valve are integrated, solving the problems of complex functions and high costs in the existing technology, and achieving efficient and stable water resource utilization.
Patent Information
- Application Number
- CN202421149864.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-05-24
AI Technical Summary
The existing flush valves are difficult to achieve anti-siphon and flow regulation functions at the same time, and the structure is complex, which increases cost and manufacturing difficulty.
An anti-siphon water inlet joint is designed, including a joint housing and an anti-siphon assembly. The adjustment screw and slide rod assembly are used to seal the water inlet end at negative pressure, and external air is introduced through the air inlet to balance the internal pressure to achieve the anti-siphon function; at the same time, the stroke of the slide rod assembly is adjusted by adjusting the screw, changing the water over water area, and flow adjustment is achieved.
The flush valve's anti-siphon and flow regulation functions are integrated, which simplifies the structure, reduces cost and manufacturing difficulty, and improves product stability and interchangeability.
Smart Images
Figure CN222557763U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flush valves, and in particular to an anti-siphon water inlet joint, flush valve and squat toilet. Background Art
[0002] The flush valve is a product used in the water supply pipeline of squat toilets. After the user steps on the foot pedal and releases it, the delay valve core in the inner cavity of the flush valve can automatically close after flushing. At present, drinking water and sanitary ware water almost all use the same set of water supply pipelines. When negative pressure appears in the water supply pipeline, siphon phenomenon will occur, and the sewage in the sanitary ware will be sucked back into the water supply pipeline, polluting the drinking water. In addition, when used in different environments, there are different requirements for flow. When the water inlet pressure is high and the flushing force is large, the flow needs to be adjusted to reduce the flow and save water resources while meeting the flushing performance. At this time, a flow regulating device needs to be added to the flush valve. Furthermore, when repairing the flush valve, it is often necessary to close the main valve for maintenance, which affects the use of other intact products. If a flow regulating device is added, the situation of closing the main gate can be avoided. As long as the flow regulating device is closed, a single flush valve can be closed for easy maintenance.
[0003] Currently, there are very few flushing valves on the market that have both anti-siphon and flow regulation functions. Even if there are such flushing valves, their structure is relatively complex, which undoubtedly increases the cost and manufacturing difficulty. In addition, most of the current flow regulating devices are almost all installed in the valve core cavity, which has certain limitations. If other types of mechanical flushing valves are used, they may not be compatible and have low interchangeability. Utility Model Content
[0004] The utility model aims to solve one of the above-mentioned technical problems in the related art to a certain extent. To this end, the utility model proposes an anti-siphon water inlet joint.
[0005] To achieve the above purpose, the technical solution of the utility model is as follows:
[0006] The utility model also proposes a flush valve with the above-mentioned anti-siphon water inlet joint.
[0007] The utility model also proposes a squat toilet with the above-mentioned anti-siphon water inlet joint.
[0008] According to the first aspect of the present invention, the anti-siphon water inlet joint of the embodiment comprises a joint shell and an anti-siphon assembly installed in the joint shell, the joint shell having a connected water inlet end, a joint inner cavity and a water outlet end, the anti-siphon assembly comprises an adjusting screw and a sliding rod assembly for opening and closing the water inlet end, the adjusting screw is threadedly connected to the joint shell, a channel is opened inside the adjusting screw along its axial direction, and an air inlet connecting the outside world and the channel is opened at the end of the adjusting screw, the sliding rod assembly comprises a sliding member, the sliding member has a sliding rod portion and a limiting portion, the sliding rod portion extends into the channel from the front end of the adjusting screw and can move in the channel, a gas channel is left between the sliding rod portion and the channel, the limiting portion is fixed at the front end of the sliding rod portion and can abut against the front end of the adjusting screw, the sliding rod portion is provided with a sealing member capable of blocking the air inlet, and an elastic member is provided between the sliding rod assembly and the joint shell.
[0009] The anti-siphon water inlet joint according to the embodiment of the present invention has at least the following beneficial effects:
[0010] 1. Add anti-siphon function and flow regulation function to the mechanical flush valve:
[0011] The flushing valve has an anti-siphon function. When negative pressure appears in the water supply pipeline, the slide rod assembly can block the water inlet end under the action of the elastic part in the water inlet joint, so that the water inlet joint is in a closed state, and the pressure at the water inlet end will not be transmitted to the flushing valve cavity. At the same time, there is an air inlet on the adjusting screw. When negative pressure appears, under the action of the elastic force of the elastic part and the negative pressure, the sliding part moves toward the water inlet end, driving the seal on the slide rod part to separate from the air inlet. At this time, the air inlet is opened, and the external air enters the inner cavity of the joint through the air inlet, so that the pressure in the inner cavity of the joint is balanced with the atmospheric pressure, and finally the pressure in the flushing valve cavity is equal to the atmospheric pressure, so there will be no siphon phenomenon. The whole device is isolated from the negative pressure transmission of the water pipe and introduces external air to balance the internal pressure at the same time. Two ways work synchronously to achieve the anti-siphon function. With the adjusting screw as the flow adjustment structure, rotating the adjusting screw to move it toward the water inlet end changes the stroke of the slide rod assembly, thereby changing the water flow area, which can meet the flow requirements under different use environments, save water, and avoid wasting resources.
[0012] 2. The anti-siphon function and flow regulation function are integrated into the water inlet joint to improve interchangeability:
[0013] The anti-siphon function and the flow regulation function are integrated in the water inlet joint, and can be adapted to various types of flushing valves. As long as this water inlet joint is assembled with the water inlet end of other flushing valves, the flushing valve can realize the anti-siphon and flow regulation functions; and the flow regulation function is integrated in the water inlet joint, there is no need to install anti-siphon or flow regulation devices in key positions such as the flushing valve cavity or the valve core cavity, which effectively avoids a series of problems caused by adding an adjustment structure in the flushing valve body and improves the stability of the product.
[0014] According to some embodiments of the utility model, the water inlet end is horizontally arranged, and the water outlet end is located below the inner cavity of the joint. The water inlet end and the water outlet end of the water inlet joint are designed in an inverted L shape, and the water inlet end of the joint is perpendicular to the water inlet part of the flush valve. The components inside the water inlet joint are horizontal to the water inlet end of the joint, and vertical to the water outlet end, and the water flow in the pipeline has no gravity effect on the device inside the joint. When negative pressure appears in the pipeline, the water inlet joint is always in a closed state under the action of the elastic force of the elastic member. Since the water inlet end of the joint and the water inlet end of the flush valve are perpendicular to each other, even if there is water flow in the pipeline, the anti-siphon component inside the joint will not be flushed open due to the gravity of the water flow, and the anti-siphon function can be stably and effectively realized.
[0015] According to some embodiments of the utility model, a limiting flange is provided in the joint housing and on the inner wall at the junction of the joint inner cavity and the water inlet end along the circumferential direction, a water stop plate capable of abutting against the limiting flange is fixedly provided at the front end of the limiting portion, and the elastic member provides elastic force to drive the water stop plate to abut against the limiting flange. When the water stop plate abuts against the limiting flange, it is in a closed state, and the water flow can push the water stop plate open to separate it from the limiting flange.
[0016] According to some embodiments of the utility model, the slide rod assembly further comprises a sealing gasket, which is fixedly mounted on the front end surface of the water stop plate. The sealing gasket always fits tightly against the limit flange under the elastic force of the elastic member and the negative pressure of the pipeline, thereby preventing the negative pressure of the pipeline from being transmitted to the flushing valve cavity, thereby stably and effectively realizing the anti-siphon function.
[0017] According to some embodiments of the utility model, the slide bar assembly further includes a flow guide, the flow guide is fixedly arranged at the front end of the slide bar, the flow guide has a conical flow guide surface, the conical flow guide surface presents a streamlined structure that is concave first and convex later from front to back, and the conical flow guide surface faces the water inlet end. The conical flow guide surface adopts a streamlined design with a concave front end and a convex rear end, and the water flows closely against the streamlined surface of the conical flow guide surface. According to the Coanda effect, it has a flow guide effect on the incoming flow, reduces the incoming flow resistance, and reduces the influence of the slide bar assembly on the flow.
[0018] According to some embodiments of the utility model, a plurality of guide ribs extend from the conical guide surface toward the water inlet end, the position where the conical guide surface is connected to the guide rib is the root of the guide rib, the end away from the root is the top of the guide rib, the width of the guide rib gradually decreases from the root to the top, the guide rib has an inner side edge and an outer side edge, the inner side edge is close to the center of the conical guide surface, the outer side edge is away from the center of the conical guide surface, the outer side edge is horizontally arranged, and the guide member can extend into the water inlet end. Adding guide ribs to the conical guide surface allows the guide member to have good guidance regardless of whether it moves under the action of water flow or the elastic force of the elastic member, thereby improving stability. The guide member extends into the water inlet end of the joint, and the radial movement of the guide member is limited by the limiting flange. The sliding rod portion extends into the channel of the adjusting screw, and the entire anti-siphon assembly forms a simply supported beam structure, which improves the rigidity and strength of the device and can withstand the impact of water flow.
[0019] According to some embodiments of the utility model, the cross-sectional area of the joint cavity changes continuously from front to back from "small-large-small". The cross-sectional area of the joint cavity changes from small to large and then to small. The joint shell adopts a parabolic design. The cross-sectional area of the joint cavity is the largest in the middle position. When the guide member slides to the middle position of the joint cavity, the water flow area formed by the guide member and the joint cavity is equivalent to the cross-sectional area of the water inlet end. At this time, the flow rate reaches the maximum. The closer the guide member is to the water inlet end of the joint, the smaller the water flow area.
[0020] According to some embodiments of the utility model, an end cap is further included, the overall shape of the joint housing is T-shaped, the end cap is arranged at the rear end of the joint inner cavity, the end cap has an outer peripheral wall and an inner peripheral wall, and the outer peripheral wall and the inner peripheral wall are both provided with threads, the end cap is threadedly connected to the joint housing through the threads on the outer peripheral wall, the adjusting screw penetrates into the end cap and is threadedly connected to the inner peripheral wall of the end cap. The end cap is provided to facilitate installation and disassembly maintenance.
[0021] According to some embodiments of the present invention, the elastic member is a spring, one end of the spring is placed on the outer periphery of the limiting portion, and the other end is placed on the outer periphery of the adjustment screw and abuts the end cover.
[0022] According to some embodiments of the utility model, the cross-sectional diameter of the air inlet is smaller than the cross-sectional diameter of the channel, the end of the slide rod portion has a sealing section, the cross-sectional diameter of the sealing section is smaller than the cross-sectional diameter of the air inlet, the sealing section can extend into the air inlet, the sealing member is a first sealing ring, and the outer peripheral wall of the sealing section is provided with an annular groove for installing the first sealing ring along the circumferential direction. When the flush valve is working normally, the water flow flushes the slide rod assembly to make it move backward, the sealing section partially enters the air inlet, drives the first sealing ring to squeeze with the inner wall of the air inlet, realizes sealing, and prevents water from leaking from the air inlet. When in the anti-siphon state, the slide rod assembly moves toward the water inlet end, and the sealing section withdraws from the air inlet to make it open, realizing air pressure balance.
[0023] According to some embodiments of the invention, a second sealing ring is provided between the outer peripheral wall of the end cover and the joint housing. The second sealing ring prevents water from leaking from the end cap.
[0024] According to some embodiments of the invention, the flow guide is threadedly connected to the slider. Threaded connections are easy to install and maintain.
[0025] According to some embodiments of the utility model, a third sealing ring is provided between the outer peripheral wall of the end of the adjusting screw and the inner peripheral wall of the end cover, and the third sealing ring prevents water in the water inlet joint from leaking from the end cover.
[0026] The flush valve according to the second embodiment of the utility model includes the anti-siphon water inlet joint, and the water inlet part of the flush valve is in communication with the water outlet end of the anti-siphon water inlet joint.
[0027] The squat toilet according to the third embodiment of the invention comprises the anti-siphon water inlet connector or the flush valve.
[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0030] Fig. 1 is an explosion diagram of the anti-siphon water inlet joint of the present invention;
[0031] Fig. 2 is an explosion diagram of the anti-siphon assembly of the present invention;
[0032] Fig. 3 is a cross-sectional view of the anti-siphon water inlet joint of the present invention (maximum flow state);
[0033] Fig. 4 is a cross-sectional view of the anti-siphon water inlet joint of the present invention (minimum flow state);
[0034] Fig. 5 is a cross-sectional view of the anti-siphon water inlet joint of the present invention (anti-siphon state at maximum flow rate);
[0035] Fig. 6 is an installation diagram of the anti-siphon water inlet joint of the present invention;
[0036] Fig. 7 is a structural diagram of a slider of the present invention.
[0037] Figure markings: joint housing 100, water inlet end 110, joint inner cavity 120, water outlet end 130, limiting flange 140, anti-siphon assembly 200, adjusting screw 210, third sealing ring 211, air inlet 212, sliding member 221, sliding rod portion 222, limiting portion 223, first sealing ring 224, water stop plate 225, sealing gasket 226, guide member 227, conical guide surface 228, guide rib 229, spring 230, end cover 300, second sealing ring 310, sealing section 400, annular groove 410, flushing valve 500. DETAILED DESCRIPTION
[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0039] Referring to Figures 1-5, an anti-siphon water inlet joint includes a joint housing 100 and an anti-siphon assembly 200 installed in the joint housing 100, the joint housing 100 has a connected water inlet end 110, a joint inner cavity 120 and a water outlet end 130, the anti-siphon assembly 200 includes an adjusting screw 210 and a slide rod assembly for opening and closing the water inlet end 110, the adjusting screw 210 is threadedly connected to the joint housing 100, the inside of the adjusting screw 210 is provided with a channel along its axial direction, and the end of the adjusting screw 210 is provided with an air inlet 212 connecting the outside and the channel, the slide rod assembly includes a sliding member 221, and the sliding member 221 has a slide rod portion 222 and a limit Part 223, the slide rod part 222 extends into the channel from the front end of the adjusting screw 210 and can move in the channel, a gas channel is left between the slide rod part 222 and the channel, the gas channel can be obtained by cutting off both sides of the slide rod part 222 along its axial direction (refer to Figure 7), thereby leaving two long gaps between the slide rod part 222 and the channel that can connect the air inlet 212 and the joint cavity 120, the limiting part 223 is fixedly arranged at the front end of the slide rod part 222 and can abut against the front end of the adjusting screw 210, the slide rod part 222 is provided with a sealing member that can block the air inlet 212, an elastic member is provided between the slide rod assembly and the joint housing 100, and a thread is provided at the water outlet end 130.
[0040] In some embodiments of the utility model, the water inlet end 110 is horizontally arranged, and the water outlet end 130 is located below the inner cavity 120 of the joint. The water inlet end 110 and the water outlet end 130 of the water inlet joint are designed in an inverted L shape, and the water inlet end of the joint is perpendicular to the water inlet part of the flush valve. The components inside the water inlet joint are horizontally related to the water inlet end 110 of the joint, and vertically related to the water outlet end 130, and the water flow in the pipeline has no gravity effect on the device in the joint. When negative pressure appears in the pipeline, under the action of the elastic force of the elastic member, the water inlet joint is always in a closed state. Since the water inlet end 110 of the joint is perpendicular to the water inlet part of the flush valve, even if there is water flow in the pipeline, the anti-siphon component 200 inside the joint will not be flushed open due to the gravity of the water flow, and the anti-siphon function can be stably and effectively realized.
[0041] In some embodiments of the utility model, a limiting flange 140 is provided in the joint housing 100 and on the inner wall at the junction of the joint inner cavity 120 and the water inlet end 110 along the circumferential direction, a water stop plate 225 capable of abutting against the limiting flange 140 is fixedly provided at the front end of the limiting portion 223, and the elastic member provides elastic force to drive the water stop plate 225 to abut against the limiting flange 140. When the water stop plate 225 abuts against the limiting flange 140, it is in a closed state, and the water flow can push the water stop plate 225 open to separate it from the limiting flange 140.
[0042] In some embodiments of the present invention, the slide bar assembly further includes a sealing gasket 226, which is fixed to the front end surface of the water stop plate 225. The sealing gasket 226 always fits tightly against the limiting flange 140 under the elastic force of the elastic member and the negative pressure of the pipeline, thereby preventing the negative pressure of the pipeline from being transmitted to the flushing valve 500 cavity, thereby stably and effectively realizing the anti-siphon function.
[0043] In some embodiments of the present utility model, the slide bar assembly further includes a flow guide 227, which is fixedly arranged at the front end of the slide bar 221, and has a conical flow guide surface 228, which presents a streamlined structure that is concave first and convex later from front to back, and the conical flow guide surface 228 faces the water inlet end 110. The conical flow guide surface 228 adopts a streamlined design with a concave front end and a convex rear end, and the water flows closely against the streamlined surface of the conical flow guide surface 228. According to the Coanda effect, the water has a flow guide effect on the incoming flow, reduces the incoming flow resistance, and reduces the influence of the slide bar assembly on the flow.
[0044] In some embodiments of the utility model, a plurality of guide ribs 229 extend from the conical guide surface 228 toward the water inlet end 110, the position where the conical guide surface 228 and the guide rib 229 are connected is the root of the guide rib 229, the end away from the root is the top of the guide rib 229, the width of the guide rib 229 gradually decreases from the root to the top, the guide rib 229 has an inner side edge and an outer side edge, the inner side edge is close to the center of the conical guide surface 228, the outer side edge is away from the center of the conical guide surface 228, the outer side edge is horizontally arranged, and the guide member 227 can extend into the water inlet end 110. Adding the guide ribs 229 to the conical guide surface 228 allows the guide member 227 to have good guidance regardless of whether it moves under the action of water flow or the elastic force of the elastic member, thereby improving stability. The guide member 227 extends into the water inlet end 110 of the joint, and the radial movement of the guide member 227 is limited by the limiting flange 140. The sliding rod portion 222 extends into the channel of the adjusting screw 210. The entire anti-siphon assembly 200 forms a simply supported beam structure, which improves the rigidity and strength of the device and can withstand the impact of water flow.
[0045] In some embodiments of the present invention, the cross-sectional area of the joint cavity 120 changes continuously from front to back from "small-large-small". The cross-sectional area of the joint cavity 120 changes from small to large and then to small. The joint housing 100 adopts a parabolic design. The cross-sectional area of the joint cavity 120 is the largest in the middle. When the guide member 227 slides to the middle of the joint cavity 120, the water flow area formed by the guide member 227 and the joint cavity 120 is equivalent to the cross-sectional area of the water inlet end 110. At this time, the flow rate reaches the maximum. The closer the guide member 227 is to the water inlet end 110 of the joint, the smaller the water flow area.
[0046] In some embodiments of the present invention, an end cap 300 is further included. The overall shape of the joint housing 100 is T-shaped. The end cap 300 is arranged at the rear end of the joint inner cavity 120. The end cap 300 has an outer peripheral wall and an inner peripheral wall, and both the outer peripheral wall and the inner peripheral wall are provided with threads. The end cap 300 is threadedly connected with the joint housing 100 through the threads on the outer peripheral wall. The adjusting screw 210 penetrates into the end cap 300 and is threadedly connected with the inner peripheral wall of the end cap 300. The end cap 300 is provided to facilitate installation and disassembly maintenance.
[0047] In some embodiments of the present invention, the elastic member is a spring 230 , one end of the spring 230 is placed on the outer periphery of the limiting portion 223 , and the other end is placed on the outer periphery of the adjustment screw 210 and abuts with the end cover 300 .
[0048] In some embodiments of the utility model, the cross-sectional diameter of the air inlet 212 is smaller than the cross-sectional diameter of the channel, and the end of the slide rod portion 222 has a sealing section 400, the cross-sectional diameter of the sealing section 400 is smaller than the cross-sectional diameter of the air inlet 212, and the sealing section 400 can extend into the air inlet 212. The sealing member is a first sealing ring 224, and the outer peripheral wall of the sealing section 400 is provided with an annular groove 410 for installing the first sealing ring 224 along the circumferential direction. When the flush valve 500 is working normally, the water flow flushes the slide rod assembly to make it move backward, and the sealing section 400 partially enters the air inlet 212, driving the first sealing ring 224 to squeeze the inner wall of the air inlet 212 to achieve sealing and prevent water from leaking from the air inlet 212. When in the anti-siphon state, the slide rod assembly moves toward the water inlet end 110, and the sealing section 400 withdraws from the air inlet 212 to make it open, achieving air pressure balance.
[0049] In some embodiments of the invention, a second sealing ring 310 is provided between the outer peripheral wall of the end cover 300 and the joint housing 100 . The second sealing ring 310 prevents water in the water inlet joint from leaking from the end cover 300 .
[0050] In some embodiments of the invention, the flow guide 227 is threaded to the slide 221 . Threaded connections are easy to install and maintain.
[0051] In some embodiments of the present invention, a third sealing ring 211 is provided between the outer peripheral wall of the end of the adjusting screw 210 and the inner peripheral wall of the end cover 300. The third sealing ring 211 prevents water in the water inlet joint from leaking from the end cover 300.
[0052] A flush valve 500 includes the above-mentioned anti-siphon water inlet joint, and the water inlet part of the flush valve is in communication with the water outlet end 130 of the anti-siphon water inlet joint.
[0053] A squat toilet includes the above-mentioned anti-siphon water inlet connector or the above-mentioned flush valve 500.
[0054] The following is a specific embodiment of the utility model:
[0055] A siphon-proof water inlet joint, comprising a T-shaped joint shell 100, an end cover 300 and an anti-siphon assembly 200 installed in the joint shell 100, wherein the joint shell 100 has a connected water inlet end 110, a joint inner cavity 120 and a water outlet end 130, wherein the water inlet end 110 is horizontally arranged, the water outlet end 130 is located below the joint inner cavity 120 and is perpendicular to the water inlet end 110, and the cross-sectional area of the joint inner cavity 120 changes continuously from front to back in a "small-large-small" manner, and the anti-siphon assembly 200 comprises an adjusting screw 210, a spring 230 and a sliding rod assembly for opening and closing the water inlet end 110, wherein the adjusting screw 210 is threadedly connected to the joint shell 100, wherein a channel is opened in the interior of the adjusting screw 210 along its axial direction, and the end of the adjusting screw 210 An air inlet 212 is provided to connect the outside with the channel, and the cross-sectional diameter of the air inlet 212 is smaller than the cross-sectional diameter of the channel. A sealing section 400 is provided at the end of the slide rod portion 222, and the cross-sectional diameter of the sealing section 400 is smaller than the cross-sectional diameter of the air inlet 212. The sealing section 400 can extend into the air inlet 212. An annular groove 410 is provided on the outer peripheral wall of the sealing section 400 along the circumferential direction, and a first sealing ring 224 is installed on the annular groove 410. The slide rod assembly is composed of a sliding member 221, a sealing gasket 226 and a guide member 227. The guide member 227, the sealing gasket 226 and the sliding member 221 are arranged in sequence from front to back, and the three are closely connected by a threaded connection between the guide member 227 and the sliding member 221. The guide member 227 has a conical guide surface 228, and the conical guide surface 229 is provided on the outer peripheral wall of the slide rod portion 222. The surface 228 presents a streamlined structure that is concave first and convex later from front to back. The conical guide surface 228 faces the water inlet end 110. Four evenly distributed guide ribs 229 extend from the conical guide surface 228 in the direction of the water inlet end 110. The position where the conical guide surface 228 is connected with the guide rib 229 is the root of the guide rib 229, and the end away from the root is the top of the guide rib 229. The width of the guide rib 229 gradually decreases from its root to the top. The guide rib 229 has an inner side edge and an outer side edge. The inner side edge is close to the center of the conical guide surface 228, and the outer side edge is away from the center of the conical guide surface 228. The outer side edge is horizontally arranged. The guide member 227 can extend into the water inlet end 110. The sliding member 221 has a sliding rod portion 222 and a limiting portion 223. The sliding rod portion 22 2 extends from the front end of the adjusting screw 210 into the channel and can move in the channel, a gas channel is left between the slide bar portion 222 and the channel, and the gas channel is obtained by cutting off two sides of the slide bar portion 222 along its axial direction, so that two long slits that can connect the air inlet 212 and the joint inner cavity 120 are left between the slide bar portion 222 and the channel, the limiting portion 223 is fixedly arranged at the front end of the slide bar portion 222 and can abut against the front end of the adjusting screw 210, a limiting flange 140 is circumferentially arranged on the inner wall of the joint housing 100 and located at the junction of the joint inner cavity 120 and the water inlet end 110, a water stop plate 225 that can abut against the limiting flange 140 is fixedly arranged at the front end of the limiting portion 223, and a spring 230 provides an elastic force that drives the water stop plate 225 to abut against the limiting flange 140,A threaded end for threaded connection with the guide member 227 is provided at the front center of the water stop plate 225. The end cap 300 is provided at the rear end of the joint inner cavity 120. The end cap 300 has an outer peripheral wall and an inner peripheral wall, and threads are provided on the outer peripheral wall and the inner peripheral wall. The end cap 300 is threadedly connected with the joint housing 100 through the threads on the outer peripheral wall. A second sealing ring 310 is provided between the outer peripheral wall of the end cap 300 and the joint housing 100. The adjusting screw 210 penetrates into the end cap 300 and is threadedly connected with the inner peripheral wall of the end cap 300. A third sealing ring 211 is provided between the outer peripheral wall of the end of the adjusting screw 210 and the inner peripheral wall of the end cap 300. One end of the spring 230 is sleeved on the outer periphery of the limiting portion 223, and the other end is sleeved on the outer periphery of the adjusting screw 210 and abuts against the end cap 300. The water outlet end 130 is provided with threads.
[0056] Installation example of the above specific embodiment: first, install the sealing gasket 226 from the threaded end of the front end of the water stop plate 225 into the sliding member 221, so that the sealing gasket 226 is close to the front end surface of the water stop plate 225, then insert the guide member 227 into the threaded end, threadedly connected with the sliding member 221, and apply a certain pre-tightening force to compress the sealing gasket 226, and then put the first sealing ring 224 from the end of the sliding rod part 222 along the axis to the annular groove 410; then put the third sealing ring 211 into the end of the adjusting screw 210, and then insert the adjusting screw 210 into the end cover 300 along the axis of the end cover 300 , connected with the end cover 300 through mutual threaded cooperation, and then the second sealing ring 310 is put on the end cover 300, and then the spring 230 is put on the limiting part 223, and the sliding rod part 222 is installed into the channel of the adjusting screw 210 along the axis of the adjusting screw 210, and finally the above-assembled components are installed into the water inlet joint from the rear end of the water inlet joint, and are connected and fixed together with the water inlet joint through the threads on the outer peripheral wall of the end cover 300 to obtain the complete structure of the water inlet joint, and finally the water outlet end 130 of the water inlet joint is connected to the water inlet part of the flushing valve 500 (refer to Figure 6).
[0057] Working principle: When the flush valve 500 is flushing normally, the water in the water pipe enters from the water inlet end 110 at the front end of the water inlet joint, and the water flow has a certain thrust on the guide member 227 to overcome the elastic force of the spring 230. The guide member 227 is fixed to the sliding member 221, so the water flow will push the guide member 227, so that the slide rod portion 222 of the sliding member 221 can slide in the channel of the adjusting screw 210. When the sliding member 221 moves backward, the water inlet end 110 and the water outlet end 130 of the water inlet joint are in a connected state, and the water in the pipeline flows into the flush valve body through the joint water outlet end 130. When the user steps on the flush valve 500 pedal, the valve core opens, and the water flows out through the flush valve 500 to achieve the flushing function; the sliding member When 221 moves backward under the action of water flow, after moving a certain distance, the rear end face of the limit part 223 on the sliding member 221 will collide with the front end face of the adjusting screw 210, thereby limiting the stroke of the sliding member 221. The adjusting screw 210 is rotated to move the adjusting screw 210 toward the water inlet end 110, which changes the stroke of the sliding member 221. When the sliding member 221 is in different positions, the water flow area formed by the guide member 227 and the joint cavity 120 is also different. Therefore, the purpose of adjusting the flow rate can be achieved by changing the extension length of the adjusting screw 210. Since the cross-sectional area of the joint cavity 120 changes continuously, the flow rate regulation belongs to stepless gear regulation, and the regulation process is relatively smooth.
[0058] When negative pressure appears in the pipeline, the sliding member 221 moves to the left, so that the sealing gasket 226 is close to the limiting flange 140, and under the action of negative pressure, the sealing gasket 226 will be pressed tighter and tighter, effectively isolating the pressure of the water inlet end 110 and the water outlet end 130, so that the negative pressure in the pipeline will not be transmitted to the water outlet end 130. At the same time, the sliding member 221 moves to the left, and the air inlet 212 on the adjusting screw 210 will open. The external air enters the adjusting screw 210 through the air inlet 212, and then flows out from the gas channel and flows into the water inlet joint, balancing the internal pressure and making the internal air pressure equivalent to the atmospheric pressure, that is, the pressure transmitted from the water inlet joint to the flushing valve cavity is also equivalent to the atmospheric pressure, and the water outlet of the flushing valve cavity is connected to the atmospheric environment, so there will be no siphon phenomenon, and finally the anti-siphon function is realized.
[0059] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. An anti-siphon water inlet joint, characterized in that: The invention comprises a joint housing (100) and an anti-siphon assembly (200) installed in the joint housing (100); the joint housing (100) has a water inlet end (110), a joint inner cavity (120) and a water outlet end (130) which are connected to each other; the anti-siphon assembly (200) comprises an adjusting screw (210) and a sliding rod assembly for opening and closing the water inlet end (110); the adjusting screw (210) is threadedly connected to the joint housing (100); a channel is formed inside the adjusting screw (210) along its axial direction; and an air inlet (212) is formed at the end of the adjusting screw (210) for connecting the outside with the channel. The slide bar assembly includes a sliding member (221), the sliding member (221) has a slide bar portion (222) and a limiting portion (223), the slide bar portion (222) extends from the front end of the adjusting screw (210) into the channel and is capable of moving in the channel, a gas channel is left between the slide bar portion (222) and the channel, the limiting portion (223) is fixed to the front end of the slide bar portion (222) and is capable of abutting against the front end of the adjusting screw (210), a sealing member capable of blocking the air inlet (212) is provided on the slide bar portion (222), and an elastic member is provided between the slide bar assembly and the joint housing (100).
2. The anti-siphon water inlet joint according to claim 1, characterized in that: A limiting flange (140) is circumferentially provided on the inner wall of the joint housing (100) at the junction of the joint inner cavity (120) and the water inlet end (110); a water stop plate (225) capable of abutting against the limiting flange (140) is fixedly provided at the front end of the limiting portion (223); and the elastic member provides elastic force to drive the water stop plate (225) to abut against the limiting flange (140).
3. The anti-siphon water inlet joint according to claim 2, characterized in that: The slide rod assembly further comprises a sealing gasket (226), and the sealing gasket (226) is fixedly arranged on the front end surface of the water stop plate (225).
4. The anti-siphon water inlet joint according to any one of claims 1 to 3, characterized in that: The slide rod assembly also includes a flow guide member (227), which is fixedly arranged at the front end of the sliding member (221), and has a conical flow guide surface (228). The conical flow guide surface (228) presents a streamlined structure that is concave first and convex later from front to back, and the conical flow guide surface (228) faces the water inlet end (110).
5. The anti-siphon water inlet joint according to claim 4, characterized in that: A plurality of guide ribs (229) extend from the conical guide surface (228) toward the water inlet end (110), the position where the conical guide surface (228) and the guide rib (229) are connected is the root of the guide rib (229), and the end away from the root is the top of the guide rib (229), the width of the guide rib (229) gradually decreases from the root to the top, the guide rib (229) has an inner side edge and an outer side edge, the inner side edge is close to the center of the conical guide surface (228), the outer side edge is away from the center of the conical guide surface (228), and the outer side edge is horizontally arranged, and the guide member (227) can extend into the water inlet end (110).
6. The anti-siphon water inlet joint according to claim 1, characterized in that: The joint housing (100) also includes an end cover (300). The overall shape of the joint housing (100) is T-shaped. The end cover (300) is arranged at the rear end of the joint inner cavity (120). The end cover (300) has an outer peripheral wall and an inner peripheral wall, and both the outer peripheral wall and the inner peripheral wall are provided with threads. The end cover (300) is threadedly connected to the joint housing (100) via the threads on the outer peripheral wall. The adjusting screw (210) penetrates into the end cover (300) and is threadedly connected to the inner peripheral wall of the end cover (300).
7. The anti-siphon water inlet joint according to claim 6, characterized in that: The elastic member is a spring (230), one end of the spring (230) is sleeved on the outer periphery of the limiting portion (223), and the other end is sleeved on the outer periphery of the adjusting screw (210) and abuts against the end cover (300).
8. The anti-siphon water inlet joint according to claim 1, characterized in that: The cross-sectional diameter of the air inlet (212) is smaller than the cross-sectional diameter of the channel. The end of the sliding rod portion (222) has a sealing section (400). The cross-sectional diameter of the sealing section (400) is smaller than the cross-sectional diameter of the air inlet (212). The sealing section (400) can extend into the air inlet (212). The sealing element is a first sealing ring (224). The outer peripheral wall of the sealing section (400) is circumferentially provided with an annular groove (410) for installing the first sealing ring (224).
9. A flushing valve (500), characterized in that: It comprises the anti-siphon water inlet joint as claimed in claim 1, wherein the water inlet portion of the flush valve is connected to the water outlet end (130) of the anti-siphon water inlet joint.
10. A squat toilet, characterized in that: It comprises the anti-siphon water inlet joint according to claim 1 or the flush valve (500) according to claim 9.