A water pressure activated drain valve

Abstract

The present invention provides a water pressure-activated drain valve, comprising a drain valve body, an inner core tube, a drain float, a water pressure-activated device, and a base. The drain valve body comprises a mounting base and a housing, the mounting base being mounted on the base, and the housing being mounted on the mounting base. The inner core tube is slidably mounted on the mounting base, a water sealing plate being fixed to the lower end of the inner core tube, the drain float being hinged within the housing via a swing arm, the swing arm being provided with a limit step, and a limit protrusion being provided on the outer wall of the inner core tube. The water pressure-activated device is disposed within the housing and comprises a piston cylinder, a piston rod, and a piston. The piston cylinder is mounted on the mounting base, the lower end of the piston rod being positioned within the piston cylinder and connected to the piston, the upper end of the piston rod pushing against the upper end of the inner core tube, forming a liquid seal between the piston rod and the upper portion of the piston cylinder, and a return spring being provided. A water pressure chamber is formed between the piston and the lower portion of the piston cylinder, and a water port is provided at the bottom of the piston cylinder, communicating with the water pressure chamber. The present invention utilizes the principle of a hydraulic piston to open the drain valve, which is convenient and labor-saving.

Description

Technical Field

[0001] The invention relates to a toilet drainage device, in particular to a water pressure-activated drainage valve. Background Art

[0002] The drain valve is a device that opens the water in the toilet tank to flush the toilet. When you press the button on the toilet tank cover, the push rod at the lower end of the button will contact the button on the drain valve, thereby lifting the inner core tube of the drain valve. The water sealing plate at the bottom of the inner core tube leaves the water outlet of the drain valve to achieve drainage.

[0003] The devices for lifting the inner core tube in the prior art mainly include a button and lever combination structure, a pull rope and lever combination structure, that is, the button or pull rope on the drain valve body acts on one end of the rotating rod, and the other end of the rotating rod acts on the inner core tube. By pressing the button or pulling the pull rope, the rotating rod is driven to rotate, thereby driving the inner core tube to lift on the drain valve body to achieve drainage.

[0004] With the development of technology, a water pressure start-up structure has emerged in the industry, which uses water pressure to expand the liquid sac and drive the lever to rotate to lift the inner core tube of the drain valve, opening the drain valve to drain water.

[0005] Because using a button or pull cord and lever mechanism to lift the inner tube requires significant force, it doesn't offer a user-friendly experience. While using water pressure to open the drain valve eliminates the need for pressing force, the lever mechanism still makes the structure complex. Furthermore, there are numerous issues, such as insufficient pressure to fill the bladder, insufficient expansion of the bladder, insufficient height to lift the inner tube, and failure to achieve the set drain time.

[0006] In view of this, the inventors conducted a systematic study on the water pressure-activated drain valve and made innovations in the drain valve structure, water pressure-activated structure, water inlet control structure, drainage control, and water inlet and outlet switching structure. Summary of the Invention

[0007] The present invention provides a water pressure-activated drain valve, which utilizes water pressure to activate an inner core to open and drain water, and has a simple structure.

[0008] The technical solutions adopted to achieve the above objectives are:

[0009] A water pressure-activated drain valve comprises a drain valve body, an inner core tube, a drain float, a water pressure-activated device, and a base; the base is provided with a water inlet and a water outlet; the drain valve body comprises a mounting seat and a shell, the mounting seat is mounted on the base, the shell is mounted on the mounting seat, and the shell is a cavity for water in and out; the inner core tube is placed in the cavity and vertically slidably arranged on the mounting seat, the lower end of the inner core tube extends from the bottom of the mounting seat and is fixed with a water sealing piece, the water sealing piece is located above the water outlet of the base and is used to block the water outlet, the drain float is hinged in the cavity of the shell through a swing arm, and a limit switch is provided on the swing arm Step, a limiting protrusion is provided on the outer wall of the inner core tube, the limiting protrusion is hooked or loosely matched with the limiting step to control the inner core tube to slide up and down, the water pressure starting device is arranged in the cavity, the water pressure starting device includes a piston cylinder, a piston rod, and a piston, the piston cylinder is placed on the mounting seat, the lower end of the piston rod is placed in the piston cylinder and connected to the piston, the upper end of the piston rod pushes against the upper end of the inner core tube, a return spring is provided between the piston rod and the upper part of the piston cylinder, a liquid seal is formed between the piston and the cylinder wall of the piston cylinder, a water pressure chamber is formed between the piston and the lower part of the piston cylinder, and a water port is provided at the bottom of the piston cylinder to communicate with the water pressure chamber.

[0010] Furthermore, the connecting water pipe is connected to the inlet and outlet water switching control valve, and the water flowing into or out of the water pressure chamber is switched and controlled by the inlet and outlet water switching control valve. The inlet and outlet water switching control valve includes a valve body, an inlet back pressure valve, a drain back pressure valve, and a buoyancy switching mechanism; the valve body is provided with an inlet waterway and an outlet waterway, the inlet pipe of the inlet waterway is connected to the water source, the outlet pipe of the inlet waterway is connected to the water pressure starting device, and the water pressure starting device is provided with water, and the inlet back pressure valve is connected to the inlet waterway. Between the pipeline and the outlet pipeline, the water inlet pipeline of the outlet waterway is connected to the water pressure starting device, and the drain pipeline of the outlet waterway leads to the toilet water tank to provide drainage for the water pressure starting device. The drain back pressure valve is connected between the water inlet pipeline and the drain pipeline; the buoyancy switching mechanism is arranged on the valve body, and the water inlet back pressure valve is opened first when the water pressure starting device is fed with water, and at the same time the drain back pressure valve is kept closed; when the water pressure starting device is draining water, the water inlet back pressure valve is closed, and at the same time the drain back pressure valve is opened.

[0011] Furthermore, the water inlet pipe of the water outlet waterway is communicated with the water outlet pipe of the water inlet waterway and is connected to the water pressure starting device through the water outlet pipe.

[0012] Furthermore, the buoyancy switching mechanism includes a starting rod, a telescopic top rod, a connecting rod, and a float bucket. The starting rod is arranged above the valve body to open the water inlet back pressure valve, the telescopic top rod is slidably arranged on the valve body to close the water inlet back pressure valve, the connecting rod is hinged on the valve body, one end of the connecting rod is used to clamp the sliding of the telescopic top rod on the valve body, and the other end of the connecting rod is slidably connected to the float bucket, which is hinged on the valve body. When the float bucket loses buoyancy, it swings downward to open the water discharge back pressure valve, and at the same time drives the connecting rod to rotate to exit the clamping of the telescopic top rod. The float bucket swings upward under the action of buoyancy to close the water discharge back pressure valve.

[0013] Furthermore, the water inlet back pressure valve is arranged on the valve body, including a water inlet valve seat, a water inlet valve cover, a water inlet water stop pad, and a lifting rod. The water inlet valve seat is located at the junction of the water inlet pipe and the water outlet pipe. A port where the water inlet pipe and the water outlet pipe intersect is provided in the water inlet valve seat. The water inlet water stop pad is provided with a water inlet sealing surface for sealing the port. The water inlet water stop pad is buckled together with the water inlet valve cover, and a back pressure cavity is formed between the water inlet water stop pad and the water inlet valve cover. The water inlet water stop pad is provided with a water inlet connecting the back pressure cavity with the water inlet pipe. The water inlet valve cover is provided with a water outlet hole that communicates the outside with the back pressure chamber. The water inlet valve cover is buckled on the water inlet valve seat. The lifting rod is hinged on the water inlet valve cover. The pressing end of the lifting rod is provided with a back pressure pad for blocking the water outlet hole. The free end of the lifting rod is located below the starting rod of the buoyancy switching mechanism and above the telescopic top rod. The starting rod is used to press down the free end of the lifting rod to make the lifting rod rotate on the water inlet valve cover, so that the back pressure pad on the pressing end of the lifting rod can release the blockage of the water outlet hole, and the telescopic top rod pushes the lifting rod to the water inlet. The valve cover rotates in opposite directions at the same time, so that the back pressure pad on the pressing end of the lifting rod can block the water outlet, and the upper part of the telescopic top rod is provided with a step surface; one end of the linkage rod of the buoyancy switching mechanism is provided with a hook for clamping the step surface of the telescopic top rod; the water discharge back pressure valve is also provided on the valve body, including a pressure relief valve seat, a pressure relief valve cover, a pressure relief water stop pad, and a rocker arm. The pressure relief valve seat is provided at the junction of the water inlet pipe and the water discharge pipe, and a pressure relief port where the water inlet pipe and the water discharge pipe intersect is provided in the pressure relief valve seat. The water-stop pad is provided with a pressure relief sealing surface for sealing the pressure relief port. The pressure relief water-stop pad is buckled together with the pressure relief valve cover, and a pressure chamber is formed between the pressure relief water-stop pad and the pressure relief valve cover. The pressure relief water-stop pad is provided with a pressure relief water inlet hole that connects the pressure chamber with the water inlet pipe. The pressure relief valve cover is provided with a pressure relief hole that connects the outside world with the pressure chamber. The pressure relief valve cover is buckled on the pressure relief valve seat. The rocker arm is hinged on the pressure relief valve cover. The fixed end of the rocker arm is fixedly connected to the float bucket. The downward pressure end of the rocker arm is provided with a downward pressure pad for sealing the pressure relief hole.

[0014] Furthermore, the valve body is provided with an axial cavity and a limit support plate, the limit support plate is provided with an axial hole, the upper part of the telescopic top rod is provided with an axial rod, the axial rod is inserted into the axial hole, the upper part of the axial rod pushes against the free end of the lifting rod, the lower part of the telescopic top rod is slidably arranged in the axial cavity, and a compression spring is provided between the lower part of the telescopic top rod and the bottom of the axial cavity.

[0015] Furthermore, an opening is provided at the bottom of the shaft cavity, and a fixed cover is buckled on the opening. One end of the compression spring abuts against the fixed cover, and the other end of the compression spring abuts against the lower part of the telescopic push rod, and the upward telescopic movement of the telescopic push rod is achieved through the compression spring.

[0016] Furthermore, the other end of the connecting rod is slidably connected to the float bucket, including a strip slide groove provided on the side wall of the float bucket, and a slide rod provided at the other end of the connecting rod. The slide rod is placed in the slide groove to facilitate the float bucket to drive the connecting rod to swing on the valve body.

[0017] Furthermore, the water inlet pipe and the water outlet pipe are coaxially and horizontally arranged on the valve body, the water outlet pipe is inserted into the water inlet pipe, the water inlet valve seat is arranged on the side of the valve body, the pressure relief valve seat is arranged on the upper part of the valve body, the water inlet pipe and the water discharge pipe are coaxially and vertically arranged on the valve body, the water inlet pipe is inserted into the water discharge pipe, the water outlet pipe also passes through the water discharge pipe horizontally, and the water inlet pipe is connected above the water outlet pipe.

[0018] Furthermore, the swing rod is placed above the free end of the lifting rod, and a through hole is provided on the swing rod for the starting rod to extend into and press down the free end of the lifting rod.

[0019] The water pressure starting device of the present invention adopts the hydraulic piston principle, utilizes the water pressure of the water source, amplifies the water pressure through the piston, and acts on the piston rod to push the core tube inside the drain valve to rise. The drain valve can be opened without people directly pressing the drain valve button, and opening the drain valve is easy and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 It is a perspective view of the present invention;

[0022] Figure 2 is an exploded view of the present invention;

[0023] Figure 3 This is a state diagram before drainage of the present invention;

[0024] Figure 4 This is a state diagram of the present invention when starting drainage;

[0025] Figure 5 This is a cross-sectional view of the present invention after drainage is started;

[0026] Figure 6 This is a schematic diagram of the water flow in the valve body when the water back pressure valve is closed before the water is started and the water back pressure valve is closed;

[0027] Figure 7 This is a schematic diagram of the water flow in the valve body when the water inlet back pressure valve is opened and the water discharge back pressure valve is closed after the drainage is started in the present invention;

[0028] Figure 8 yes Figure 6 A partial enlarged cross-sectional view at center;

[0029] Figure 9 yes Figure 7 A partial enlarged cross-sectional view at point B in the middle;

[0030] Figure 10 This is a schematic diagram of water flow after the drainage is started and before the inner core pipe is lifted;

[0031] Figure 11 This is a schematic diagram of the water flow after the inner core tube is lifted after the drainage is started in the present invention;

[0032] Figure 12 This is a diagram of the drainage process of the present invention placed in a toilet tank;

[0033] Figure 13 This is a cross-sectional view of the present invention after drainage is completed;

[0034] Figure 14 It is a schematic diagram of the lifting rod being pushed and rotated by the telescopic top rod after the drainage of the present invention is completed;

[0035] Figure 15 This is a schematic diagram of the water flow in the valve body after the water inlet back pressure valve is closed and the water discharge back pressure valve is closed after the water is drained;

[0036] Figure 16 This is a schematic diagram of water backflow in the piston cylinder after drainage is completed in the present invention;

[0037] Figure 17 This is a schematic diagram of the water flow in the valve body after the water inlet back pressure valve is closed and the water discharge back pressure valve is opened after the water is drained;

[0038] Figure 18 yes Figure 5 A partial enlarged cross-sectional view at point C in the middle;

[0039] Figure 19 yes Figure 13 A partial enlarged cross-sectional view at point D in the middle. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 19As shown, the present invention discloses a water pressure activated drain valve 10, which is installed in a toilet tank 3 (such as Figure 12 As shown), Figure 1 、 2 , 10, 11, 16, including a drain valve body 11, an inner core tube 12, a drain float 13, a base 14, and a water pressure starting device 2; the base 14 is provided with a water inlet 141 and a water outlet 142; the drain valve body 11 includes a mounting seat 111 and a shell 112, the mounting seat 111 is mounted on the base 14, and the shell 112 is mounted on the mounting seat 111, and the shell 111 is a cavity 113 that can flow in and out of water; the inner core tube 12 is placed in the cavity 113 and vertically slides on the mounting seat 111, the lower end of the inner core tube 12 extends from the bottom of the mounting seat 111 and is fixed with a water sealing piece 15, the water sealing piece 15 is located above the water outlet 142 of the base 14, and is used to block the water outlet 142, the drain float 13 is hinged in the cavity 113 of the shell 111 through a swing arm 16, and the swing arm 16 is provided on the drain float 13. A limiting step 161 is provided on the arm 16, and a limiting protrusion 121 is provided on the outer wall of the inner core tube 12. The limiting protrusion 121 is hooked or loosely matched with the limiting step 161 to control the inner core tube 12 to slide up and down; the water pressure starting device 2 is arranged in the cavity 113, and the water pressure starting device 2 includes a piston cylinder 21, a piston rod 22, and a piston 23. The piston cylinder 21 is placed on the mounting seat 111, and the lower end of the piston rod 22 is placed in the piston cylinder 21 and connected to the piston 23. The upper end of the piston rod 22 pushes against the upper end of the inner core tube 12, and a return spring 24 is provided between the piston rod 22 and the upper part of the piston cylinder 21. A liquid seal is formed between the piston 23 and the cylinder wall of the piston cylinder 21, and a water pressure chamber 25 is formed between the piston 23 and the lower part of the piston cylinder 21. A water outlet 26 is provided at the bottom of the piston cylinder 21 and communicates with the water pressure chamber 25.

[0042] Further implementation plan, such as Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 、 Figure 16 As shown, in this industry, the inner core tube 12 is usually arranged in the center of the drain valve body 11. In order to lift the inner core tube 12 more smoothly, the water pressure starting device 2 is placed on one side of the inner core tube 12 and is vertically juxtaposed with the inner core tube 12 in the shell 112. A connecting rod 122 extends radially outward from the upper end of the inner core tube 12, and the upper end of the piston rod 22 pushes against the connecting rod 122.

[0043] Further implementation plan, such as Figure 1 、 Figure 2 As shown, a notch 114 is provided on the shell 112 of the drain valve body 11 to facilitate the installation of the water pressure starting device 2 on the mounting seat 111 .

[0044] Further implementation plan, such as Figure 2 、 Figure 10 、 Figure 11 、 Figure 16 As shown, the upper end of the piston cylinder 21 is provided with a cylinder cover 27, and the cylinder cover 27 is provided with a through hole 271 for the piston rod 22 to pass through. The return spring 24 is sleeved on the piston rod 22, and the upper end of the return spring 24 abuts against the cylinder cover 27, and the lower end of the return spring 24 abuts against the piston 23.

[0045] Further implementation plan, such as Figure 2 、 Figure 10 、 Figure 11 、 Figure 16 As shown, the water inlet 26 is provided on the bottom side wall of the piston cylinder 21 , so as to facilitate the connection between the water inlet 26 and the connecting water pipe 31 .

[0046] Further implementation plan, such as Figure 2 、 11 As shown, in order to prevent the water pressure chamber 25 from exceeding the set pressure and damaging the return spring 24, a pressure relief port 211 is provided at the bottom of the piston cylinder 21, and a pressure limiting valve 28 is provided at the pressure relief port. The pressure limiting valve 28 includes a gasket 281, a push member 282 and a push spring 283. The gasket 281 is arranged on the push member 282, and the push spring 283 is arranged on the mounting seat 111. The push spring 283 presses against the push member 282 so that the gasket 281 blocks the pressure relief port 211. When the water in the water pressure chamber 25 exceeds the set pressure, the gasket 281 is stretched open, and the excess water in the water pressure chamber 25 is directly drained from the pressure relief port 211.

[0047] According to a further implementation scheme, the drainage float 13 is provided on the adjusting rod 17, and the adjusting rod 17 is vertically movable and immersed in the shell 111. The adjusting rod 17 is hinged to the swing arm 16, and the drainage float 13 is placed at different heights on the adjusting rod 17 to adjust the time when the drainage float 13 loses buoyancy, thereby adjusting the drainage volume of the water tank 3.

[0048] The water pressure-activated drainage principle of the drain valve 10 of the present invention is: Figure 2 、 10As shown in , 11, 12, and 16, when the water in the connecting water pipe 31 flows into the water pressure chamber 25 from the bottom water port 26 of the piston cylinder 25, the water pressure pushes the piston 23 and the piston rod 22 to slide upward, and the return spring 24 is compressed. Since the upper end of the piston rod 22 abuts against the connecting rod 122 at the upper end of the inner core tube 12, the inner core tube 12 is driven to move upward in the drain valve body 11, and the water sealing plate 15 at the lower end of the inner core tube 12 leaves the water outlet 142 of the base 14, releasing the blockage of the water outlet 142, and the drain valve 10 is opened to drain, and the water in the water tank 3 flows into the toilet from the water inlet 141 through the water outlet 142 to flush the toilet; when the inner core tube 12 continues to rise, the height of the limiting protrusion 121 on the outer wall of the inner core tube 12 exceeds the limiting step 161 on the swing arm 16, and the limiting protrusion 121 will be hooked by the limiting step 161 (as shown in FIG. Figure 4 、 5 As shown in the figure, the drain valve 10 continues to drain water; when the water flow into the connecting water pipe 31 stops, the piston 23 in the piston cylinder 21 loses pressure, and the return spring 24 pushes the piston 23 downward to reset, and the upper end of the piston rod 22 loosens and abuts against the connecting rod 122 at the upper end of the inner core tube 12, and the water in the hydraulic chamber 25 is discharged outward through the connecting water pipe 31; when the water in the water tank 3 flows to the drainage float 13 and loses buoyancy, the drainage float 13 drives the adjusting rod 17 to fall, and the adjusting rod 17 drives the swing arm 16 to swing downward on the housing 111, and the limiting step 161 on the swing arm 16 loosens the hook against the limiting protrusion 121 on the inner core tube 12, the inner core tube 12 falls, and the water sealing piece 15 at the lower end of the inner core tube 12 reseals the water outlet 142, and the drain valve 10 is closed for drainage.

[0049] The water pressure starting device 2 of the present invention utilizes the hydraulic piston principle. By injecting water from a water source into the water pressure chamber 25, the water pressure of the water source acts on the piston 23. Since the cross-sectional area of ​​the piston 23 is larger than the cross-sectional area of ​​the piston rod 22, according to the hydraulic principle, a larger thrust will be generated on the piston rod 22, thereby opening the drain valve 10 to drain water.

[0050] Further implementation plan, such as Figures 1 to 19 As shown, in order to switch and control the water flowing into or out of the water pressure chamber 25 of the piston cylinder 21, the connecting water pipe 31 is connected to the inlet and outlet water switching control valve 40, and the water flowing into or out of the water pressure chamber 25 is switched and controlled by the inlet and outlet water switching control valve 40.

[0051] like Figure 1-9, 12-15, 17-19, an inlet and outlet water switching control valve 40 is used to switch the inlet and outlet water of the water pressure starting device 2, including a valve body 4, an inlet back pressure valve 5, a drain back pressure valve 6, and a buoyancy switching mechanism 7; the valve body 40 is provided with an inlet waterway 42 and an outlet waterway 43, the inlet pipe 422 of the inlet waterway 42 is connected to the water source, the outlet pipe 423 of the inlet waterway 42 is connected to the water pressure starting device 2, and the inlet back pressure valve 5 is connected between the inlet pipe 422 and the outlet pipe 423. The water inlet pipe 437 of the water outlet waterway 43 is connected to the water pressure starting device 2, the drain pipe 438 of the water outlet waterway 43 leads to the toilet water tank 3, and the drain back pressure valve 6 is connected between the water inlet pipe 437 and the drain pipe 438; the buoyancy switching mechanism 7 is arranged on the valve body 4, and the water inlet back pressure valve 5 is opened first when the water pressure starting device 2 is fed with water, and at the same time the drain back pressure valve 6 is kept closed; when the water pressure starting device is draining water 2, the water inlet back pressure valve 5 is closed, and at the same time the drain back pressure valve 6 is opened.

[0052] Further implementation plan, such as Figure 1-2 As shown in Figures 4, 6, 10-12, and 14-17, the outlet pipe 423 of the water inlet circuit 42 is connected to the water pressure starting device 2. Specifically, the outlet pipe 423 is connected to the water outlet 26 at the bottom of the piston cylinder 25 via the connecting water pipe 31. The water inlet pipe 437 of the water outlet circuit 43 is in communication with the outlet pipe 423 of the water inlet circuit 42, and is indirectly in communication with the water outlet 26 at the bottom of the piston cylinder 25 of the water pressure starting device 2 via the outlet pipe 423. Of course, the water inlet pipe 437 of the water outlet circuit 43 can also be directly in communication with the water outlet 26 at the bottom of the piston cylinder 25 of the water pressure starting device 2, or with the hydraulic chamber 25, by providing an independent pipe.

[0053] Further implementation plan, such as Figure 1-5 As shown in Figure 13, the buoyancy switching mechanism 7 includes a starting rod 79, a telescopic top rod 74, a connecting rod 75, and a float bucket 76. The starting rod 79 is arranged above the valve body 4 to press down and open the water inlet back pressure valve 5. The telescopic top rod 74 is slidably arranged on the valve body 4 to close the water inlet back pressure valve 5. The connecting rod 76 is hinged on the valve body 4. One end of the connecting rod 76 is used to clamp the telescopic top rod 74 to slide on the valve body 4. The other end of the connecting rod 76 is slidably connected to the float bucket 76. The float bucket 76 is hinged on the valve body 4. When the float bucket 76 loses buoyancy, it swings downward to open the water discharge back pressure valve 5. At the same time, it drives the connecting rod 75 to rotate to exit the clamping of the telescopic top rod 74. The float bucket 76 swings upward under the action of buoyancy to close the water discharge back pressure valve 6.

[0054] According to a further embodiment, the water inlet back pressure valve 5 and the water discharge back pressure valve 6 utilize the back pressure principle of the water inlet valve in this industry. This back pressure principle and structure are existing technologies in this field.

[0055] like Figure 1-2 , 6-9, 15, 17, the water inlet back pressure valve 5 is arranged on the valve body 4, including a water inlet valve seat 50, a water inlet valve cover 51, a water inlet water stop pad 52, and a lifting rod 53. The water inlet valve seat 50 is located at the intersection of the water inlet pipe 422 and the water outlet pipe 423 on the valve body 4. The water inlet valve seat 50 is provided with a port 44 where the water inlet pipe 422 and the water outlet pipe intersect 423. The water inlet water stop pad 52 is provided with a sealing The water inlet sealing surface 521 of the port 44, the water inlet water stop pad 52 and the water inlet valve cover 51 are buckled together, and a back pressure chamber 58 is formed between the water inlet water stop pad 52 and the water inlet valve cover 51. The water inlet water stop pad 52 is provided with a water inlet hole 522 to connect the back pressure chamber 58 with the water inlet pipe 422, and the water inlet valve cover 51 is provided with a water outlet hole 511 to connect the outside with the back pressure chamber 58. The water inlet valve cover 51 is buckled on the water inlet valve seat 50, and the lifting rod 53 is hinged on the water inlet valve cover 51, and the pressing end 531 of the lifting rod 53 is provided with a back pressure pad 533 for blocking the water outlet hole 511. The free end 532 of the lifting rod 53 is located below the starting rod 79 of the buoyancy switching mechanism 7 and above the telescopic top rod 74. The starting rod 74 is used to press down the free end 532 of the lifting rod 53 to rotate the lifting rod 53 on the water inlet valve cover 50, so that the back pressure pad 533 on the pressing end 531 of the lifting rod 53 is The pad 533 can release the blockage of the water outlet 511, and the telescopic top rod 74 pushes the lifting rod 53 to rotate in the opposite direction on the water inlet valve cover 50, so that the back pressure pad 533 on the pressing end 531 of the lifting rod 53 can block the water outlet 511, and the upper part of the telescopic top rod 74 is provided with a step surface 741; one end of the connecting rod 75 of the buoyancy switching mechanism 7 is provided with a hook 551 for clamping the step surface 741 of the telescopic top rod 74.

[0056] like Figure 1-9 , 12-15, 17-19, the water relief back pressure valve 6 is also provided on the valve body 6, including a pressure relief valve seat 60, a pressure relief valve cover 61, a pressure relief water stop pad 62, and a rocker rod 67. The pressure relief valve seat 60 is provided at the junction of the water inlet pipe 437 and the water discharge pipe 438. A pressure relief port 49 intersecting the water inlet pipe 437 and the water discharge pipe 438 is provided in the pressure relief valve seat 60. A pressure relief sealing surface 621 for sealing the pressure relief port 49 is provided on the pressure relief water stop pad 62. The pressure relief water stop pad 62 is buckled together with the pressure relief valve cover 61. The pressure relief valve cover 61 is provided with a pressure relief hole 611 to connect the pressure chamber 68 with the water inlet pipe 437. The pressure relief valve cover 61 is provided with a pressure relief hole 611 to connect the outside with the pressure chamber 68. The pressure relief valve cover 61 is buckled on the pressure relief valve seat 60. The rocker arm 67 is hinged on the pressure relief valve cover 61. The fixed end 671 of the rocker arm 67 is fixedly connected to the float 76. The downward pressure end 672 of the rocker arm 67 is provided with a downward pressure pad 674 for sealing the pressure relief hole 611.

[0057] Further implementation plan, such as Figure 2-5 As shown in Figures 13 and 13, the valve body 4 is provided with an axial cavity 451 and a limiting support plate 452, the limiting support plate 452 is provided with an axial hole 453, the upper part of the telescopic top rod 74 is provided with a shaft rod 742, the shaft rod 742 is inserted into the axial hole 453, the lower part of the telescopic top rod 74 is slidably arranged in the axial cavity 451, and a compression spring 743 is provided between the lower part of the telescopic top rod 74 and the bottom of the axial cavity 451. The limiting support plate 452 blocks the step surface 741 of the telescopic top rod 74 to prevent the upper telescopic top rod 74 from sliding out of the axial cavity 451.

[0058] Further implementation plan, such as Figure 2-5 As shown in Figure 13, the bottom of the shaft cavity 451 is provided with an opening 454, and a fixed cover 455 is buckled on the opening 454. One end of the compression spring 743 abuts against the fixed cover 455, and the other end of the compression spring 743 abuts against the lower part of the telescopic top rod 74. The upward telescopic movement of the telescopic top rod 74 is achieved through the compression spring 743.

[0059] Further implementation plan, such as Figure 2-5 As shown, the other end of the connecting rod 75 is slidably connected to the float barrel 76, including a strip slide groove 761 provided on the side wall of the float barrel 76, and the other end of the connecting rod 75 is provided with a slide rod 752. The slide rod 752 is placed in the slide groove 761, which makes it convenient for the float barrel 76 to drive the connecting rod 75 to swing on the valve body 4.

[0060] Further implementation plan, such as Figure 6 、 7 As shown in Figures 15 and 17, the water inlet pipe 422 and the water outlet pipe 423 are coaxially and horizontally arranged on the valve body 4, the water outlet pipe 423 is inserted into the water inlet pipe 422, the water inlet valve seat 50 is arranged on the side of the valve body 4, the pressure relief valve seat 60 is arranged on the upper part of the valve body 4, the water inlet pipe 437 and the water discharge pipe 438 are coaxially and vertically arranged on the valve body 4, the water inlet pipe 437 is inserted into the water discharge pipe 438, and the water outlet pipe 423 also passes through the water discharge pipe 438 horizontally, and the water inlet pipe 437 is connected above the water outlet pipe 438.

[0061] Further implementation plan, such as Figure 6 、 7 As shown in Figures 15 and 17, the lower part of the drainage pipe 438 is clamped with a fixing seat 481, and the fixing seat 481 is provided with a drainage pipe hole 482.

[0062] Further implementation plan, such as Figure 2 As shown, a core hole 523 is provided at the center of the water inlet water-stopping pad 52, and a water-stopping core 524 is sleeved in the core hole 523.

[0063] Further implementation plan, such as Figure 1、 2 As shown in Figures 3, 4, and 5, the rocker arm 67 is positioned above the free end 532 of the lifting rod 53. A through hole 675 is provided on the rocker arm 67 to facilitate the starting rod 79 to extend into and press down the free end 532 of the lifting rod 53.

[0064] Further implementation plan, such as Figure 2 、 6 As shown in Figures 7, 15 and 17, a pressure relief positioning piece 461 is further provided in the pressure relief valve seat 60. The pressure relief positioning piece 461 is placed at the intersection of the water inlet pipe 437 and the water discharge pipe 438, and the pressure relief port 49 is exposed from the center hole 462 of the pressure relief positioning piece 461.

[0065] The water flow switching principle of the inlet and outlet water switching control valve 40 of the present invention is as follows: the water inlet pipe 422 of the water inlet waterway 42 is connected to the water supply pipe 32, and the water from the water source enters the water inlet pipe 422 through the water supply pipe 32. The water pressure of the water source is used to form a back pressure in the back pressure chamber 58 of the water inlet back pressure valve 5. At this time, the water inlet back pressure valve 5 is in a closed state, cutting off the water inlet waterway 42; when water is fed into the water pressure starting device 2 of the water supply and drainage valve 10, the buoyancy switching mechanism 7 first opens the water inlet back pressure valve 5, conducts the water inlet waterway 42, and at the same time uses the water pressure of the water source to open the back pressure valve 6 in the back pressure chamber 58 of the water discharge valve 6. Back pressure is formed in the pressure chamber 68, keeping the drain back pressure valve 6 closed, cutting off the outlet waterway 43, and allowing water to enter the water pressure starting device 2 of the water supply and drainage valve 10; when the water pressure starting device 2 of the water supply and drainage valve 10 is draining water, the water pressure of the water source is used to form back pressure in the back pressure chamber 58 of the water inlet back pressure valve 5, so that the water inlet back pressure valve 5 is closed again, and the water inlet waterway 42 is cut off again. At the same time, the back pressure in the pressure chamber 68 of the drain back pressure valve 6 is released, the drain back pressure valve 6 is opened, and the outlet waterway 43 is connected, so that the water pressure starting device 2 of the water supply and drainage valve 10 is drained. The specific water flow switching principle is as follows:

[0066] like Figure 1 、 Figure 3 、 Figure 6 、 Figure 8 、 Figure 12 As shown, before the water inlet and outlet switching control valve 40 is started, the shaft 742 at the upper end of the telescopic push rod 74 presses against the free end 532 of the lifting rod 53, and the back pressure pad 533 on the pressing end 531 of the lifting rod 53 blocks the water outlet hole 511. Water from the water source flows into the water inlet pipe 422 from the water supply pipe 32, and water enters the back pressure chamber 58 from the water inlet hole 522 on the water inlet water stop pad 52. The water pressure reacts on the water inlet water stop pad 52, and the water inlet sealing surface 521 on the water inlet water stop pad 52 blocks the port 44, thereby preventing the water in the water inlet pipe 422 from entering the water outlet pipe 423 through the port 44 (as shown in FIG. Figure 6As shown), at this time, the water in the water tank 3 is not discharged through the drain valve 10, and the float bucket 76 floats up under the action of buoyancy, driving the down-pressure pad 674 on the down-pressure end 672 of the swing rod 67 to block the pressure relief hole 611 (as shown). Figure 5 、 18 as shown); Figure 4 、 Figure 5 、 Figure 7 、 Figure 9 As shown, the starting rod 79 of the buoyancy switching mechanism 7 is pressed, and the starting rod 79 presses down the free end 532 of the lifting rod 53, and the lifting rod 53 rotates on the water inlet valve cover 51. The free end 532 of the lifting rod 53 pushes the telescopic top rod 74 to slide downward in the shaft cavity 451, and the compression spring 743 is compressed until the step surface 741 on the telescopic top rod 74 is hooked by the hook 751 on the connecting rod 75 (as shown in FIG. Figure 5 、 12 As shown), the back pressure pad 533 on the pressing end 531 of the lifting rod 53 releases the blockage of the water outlet 511, the water in the back pressure chamber 58 loses pressure, the water inlet sealing surface 521 on the water inlet water stop pad 52 releases the blockage of the port 44, the water in the water inlet pipe 422 enters the water outlet pipe 423 through the port 44, a part of the water in the water outlet pipe 423 flows into the water inlet pipe 437, the water in the water inlet pipe 437 enters the pressure chamber 68 through the pressure relief water inlet hole 622 on the pressure relief water stop pad 62, and forms back pressure in the pressure chamber 68, the pressure relief sealing surface 621 on the pressure relief water stop pad 62 blocks the pressure relief port 49, and blocks the water in the water in the water inlet pipe 437 from entering the water discharge pipe 438 (as shown). Figure 5 、 7 As shown), the water in the water outlet pipe 423 will only enter the connecting water pipe 31 connected thereto, and the connecting water pipe 31 is communicated with the water port 26 at the bottom of the above-mentioned water pressure starting device 2, thereby entering the water pressure starting device 2 of the drain valve 10 through the water outlet pipe 423, and being used to start the drain valve 10 to drain water. For details, please refer to the drainage principle content of the above-mentioned drain valve 10.

[0067] like Figure 1 、 Figure 3 、 Figure 6 、 Figure 8 、 Figure 12 As shown, when the water in the water tank 3 is drained to the float 76 and loses its buoyancy, the float 76 drives the rocker arm 67 to rotate on the pressure relief valve cover 61, and the float 76 drives the connecting rod 75 to swing on the valve body 4, and the slide rod 752 of the connecting rod 75 slides downward in the slide groove 761, and the hook 751 on the connecting rod 75 loosens the hook on the step surface 741 on the telescopic top rod 74, and the telescopic top rod 74 slides upward in the shaft cavity 451 under the reaction of the compression spring 743, and the shaft rod 742 on the upper part of the telescopic top rod 74 again supports the free end 532 of the lifting rod 53, and the back pressure pad 533 on the pressing end 531 of the lifting rod 53 again blocks the water outlet 511 (as shown in FIG. Figure 14 As shown in FIG4 , the water flowing from the water supply pipe 32 into the water inlet pipe 422 forms a back pressure in the back pressure chamber 58 again, and the water pressure reacts on the water inlet water stop pad 52 again. The water inlet sealing surface 521 on the water inlet water stop pad 52 blocks the port 44 again, thereby preventing the water in the water inlet pipe 422 from entering the water outlet pipe 423 through the port 44 (as shown in FIG4 ). Figure 15 At the same time, the float 76 also drives the rocker arm 67 to rotate on the pressure relief valve cover 61, and the pressure pad 674 on the pressure end 672 of the rocker arm 67 releases the blockage of the pressure relief hole 611, and the water in the pressure chamber 68 flows out of the pressure relief hole 611, the back pressure in the pressure chamber 68 disappears, and the pressure relief sealing surface 621 on the pressure relief water stop pad 62 releases the blockage of the pressure relief port 49 (as shown in FIG. Figure 13 、 19 As shown), the water in the hydraulic chamber 25 of the hydraulic starting device 2 is squeezed outward and flows back to the connecting water pipe 31 (as shown in FIG. Figure 16 、 17 As shown), it flows into the water inlet pipe 437 through the outlet pipe 423, then flows into the drain pipe 438 through the pressure relief port 49, and finally flows into the toilet water tank through the drain pipe hole 482, completing the water switching in the water pressure chamber 25 of the water pressure starting device 2.

[0068] It should be noted that the buoyancy switching mechanism 7 of the water inlet and outlet switching control valve 40 of the present invention cooperates with the water inlet back pressure valve 5 to form a water inlet control device for the water pressure starting device 2, and the starting rod 79 of the buoyancy switching mechanism 7 is used to press down the lifting rod 53 of the water inlet back pressure valve 5, and the telescopic top rod 74 abuts against the lifting rod 53, and the abutment of the telescopic top rod 74 on the lifting rod 53 is limited by the connecting rod 75. When the float barrel 76 loses its buoyancy, the telescopic top rod 74 is released from the abutment of the lifting rod 53, thereby realizing the opening and closing control of the water outlet hole 511 on the water inlet valve cover 51. The control of the generation and disappearance of the back pressure in the back pressure chamber 58 is achieved, thereby controlling the water inlet to the water pressure starting device 2 through the water inlet waterway 42; the buoyancy switching mechanism 7 of the inlet and outlet water switching control valve 40 of the present invention cooperates with the water discharge back pressure valve 6 to form a water discharge control device for the water pressure starting device 2, and the fixed connection between the float barrel 76 of the buoyancy switching mechanism 7 and the rocker rod 67 of the water discharge back pressure valve 6 is utilized, and the buoyancy of the float barrel 76 is utilized to realize the opening and closing control of the pressure relief hole 611 on the pressure relief valve cover 61, thereby controlling the drainage of the water pressure starting device 2 through the water outlet waterway 43. It can be seen from this that the only structural component commonly used by the water inlet control device and the water outlet control device of the water pressure starting device 2 is the float 76 of the buoyancy switching mechanism 7. Therefore, the water inlet control device and the water outlet control device can be designed relatively independently. For example, the float 76 of the buoyancy switching mechanism 7 is not necessarily hinged to the pressure relief valve cover 61 through the rocker arm 67, but can also be directly hinged to the valve body 4, while the rocker arm 6 of the water relief back pressure valve 6 is separately connected to another float. The outlet pipe 423 of the water inlet waterway 42 and the water inlet pipe 437 of the water outlet waterway 43 are not interconnected, but independent of each other, that is, the water outlet pipe 423 is separately connected to the water pressure chamber 25 of the water pressure starting device 2, and the water inlet pipe 437 is separately connected to the water pressure chamber 25 of the water pressure starting device 2, which can also realize the switching of the water inlet and outlet of the water pressure starting device 2.

[0069] In addition, the inlet and outlet water switching control valve 40 of the present invention is not only applicable to the water pressure starting device 2 made using the piston principle in the above-mentioned embodiment, but can also be applied to the water pressure starting device in the prior art that expands the liquid sac to lift the inner core tube, such as the liquid sac, which is arranged on the drain valve body, and water is injected and drained into the liquid sac so that the liquid sac can expand or contract; the expansion of the liquid sac drives the inner core tube of the drain valve to rise through the lever part, thereby opening the drain port, and the drain valve drains water.

[0070] Furthermore, the water pressure starting device 2 of the present invention can not only open the drain valve with an inner core tube in the above-mentioned embodiment to drain water, but also open the drain valve with a flap-type structure in the prior art to drain water, such as connecting the piston rod to the flap of the drain valve, pushing the water sealing plate on the flap away from the drain port of the drain valve, thereby starting the drain valve to drain water.

[0071] Therefore, the above description is only a preferred embodiment of the present invention and is not a limitation on the design of this case. Any equivalent changes made based on the design key of this case fall within the scope of protection of this case.

Claims

1. A water pressure-activated drain valve, comprising a drain valve body, an inner core tube, a drain float, a water pressure-activated device, and a base; the base is provided with a water inlet and a water outlet; the drain valve body comprises a mounting seat and a shell, the mounting seat is mounted on the base, the shell is mounted on the mounting seat, and the shell is a cavity for water in and out; the inner core tube is placed in the cavity and vertically slidably arranged on the mounting seat, the lower end of the inner core tube extends from the bottom of the mounting seat and is fixed with a water sealing piece, the water sealing piece is located above the water outlet of the base for sealing the water outlet, the drain float is hinged in the cavity of the shell by a swing arm, the swing arm is provided with a limit step, the outer wall of the inner core tube is provided with a limit protrusion, the limit protrusion is hooked or loosely matched with the limit step to control the inner core tube to slide up and down, characterized in that: The water pressure starting device is arranged in the cavity, and the water pressure starting device includes a piston cylinder, a piston rod, and a piston. The piston cylinder is placed on the mounting seat, the lower end of the piston rod is placed in the piston cylinder and connected to the piston, the upper end of the piston rod pushes against the upper end of the inner core tube, a return spring is provided between the piston rod and the upper part of the piston cylinder, a liquid seal is formed between the piston and the cylinder wall of the piston cylinder, a water pressure chamber is formed between the piston and the lower part of the piston cylinder, and a water port is provided at the bottom of the piston cylinder to communicate with the water pressure chamber; The upper end of the piston cylinder is provided with a cylinder cover, and the cylinder cover is provided with a through hole for the piston rod to pass through. The reset spring is sleeved on the piston rod, and the upper end of the reset spring abuts against the cylinder cover, and the lower end of the reset spring abuts against the piston; The water inlet is connected to the connecting water pipe, and the connecting water pipe is connected to the inlet and outlet water switching control valve, and the water flowing into or out of the water pressure chamber is switched and controlled by the inlet and outlet water switching control valve. The inlet and outlet water switching control valve includes a valve body, an inlet back pressure valve, a drain back pressure valve, and a buoyancy switching mechanism; the valve body is provided with an inlet waterway and an outlet waterway, the inlet pipe of the inlet waterway is connected to the water source, and the outlet pipe of the inlet waterway is connected to the water pressure starting device to provide water to the water pressure starting device, and the inlet back pressure valve Connected between the water inlet pipe and the water outlet pipe, the water inlet pipe of the water outlet waterway is connected to the water pressure starting device, and the drain pipe of the water outlet waterway leads to the toilet water tank to provide water for the water pressure starting device. The water discharge back pressure valve is connected between the water inlet pipe and the drain pipe; the buoyancy switching mechanism is arranged on the valve body, and when the water pressure starting device is supplied with water, the water inlet back pressure valve is first opened, while the water discharge back pressure valve is kept closed. When the water pressure starting device is discharged, the water inlet back pressure valve is closed, and the water discharge back pressure valve is opened at the same time; The buoyancy switching mechanism includes a starting rod, a telescopic top rod, a connecting rod, and a float bucket. The starting rod is arranged above the valve body to open the water inlet back pressure valve. The telescopic top rod is slidably arranged on the valve body to close the water inlet back pressure valve. The connecting rod is hinged on the valve body. One end of the connecting rod is used to clamp the sliding of the telescopic top rod on the valve body. The other end of the connecting rod is slidably connected to the float bucket. The float bucket is hinged on the valve body. When the float bucket loses buoyancy, it swings downward to open the water discharge back pressure valve. At the same time, it drives the connecting rod to rotate to exit the clamping of the telescopic top rod. The float bucket swings upward under the action of buoyancy to close the water discharge back pressure valve.

2. A water pressure activated drain valve according to claim 1, characterized in that: The water inlet pipe of the water outlet waterway is communicated with the water outlet pipe of the water inlet waterway and is connected to the water pressure starting device through the water outlet pipe.

3. A water pressure activated drain valve according to claim 1, characterized in that: The water inlet back pressure valve is arranged on the valve body, and includes a water inlet valve seat, a water inlet valve cover, a water inlet water stop pad, and a lifting rod. The water inlet valve seat is located at the intersection of the water inlet pipe and the water outlet pipe. A port where the water inlet pipe and the water outlet pipe intersect is provided in the water inlet valve seat. The water inlet water stop pad is provided with a water inlet sealing surface for sealing the port. The water inlet water stop pad is buckled together with the water inlet valve cover, and a back pressure cavity is formed between the water inlet water stop pad and the water inlet valve cover. A water inlet hole that connects the back pressure cavity with the water inlet pipe is provided on the water inlet water stop pad. The water valve cover is provided with a water outlet hole that connects the outside with the back pressure chamber, the water inlet valve cover is buckled on the water inlet valve seat, the lifting rod is hinged on the water inlet valve cover, the pressing end of the lifting rod is provided with a back pressure pad for sealing the water outlet hole, the free end of the lifting rod is located below the starting rod of the buoyancy switching mechanism and above the telescopic top rod, the starting rod is used to press down the free end of the lifting rod to make the lifting rod rotate on the water inlet valve cover, so that the back pressure pad on the pressing end of the lifting rod can release the blockage of the water outlet hole, and the telescopic top rod pushes the lifting rod on the water inlet valve cover. Rotate in opposite directions at the same time, so that the back pressure pad on the pressing end of the lifting rod can block the water outlet, and the upper part of the telescopic top rod is provided with a step surface; one end of the connecting rod of the buoyancy switching mechanism is provided with a hook for clamping the step surface of the telescopic top rod; the water discharge back pressure valve is also arranged on the valve body, including a pressure relief valve seat, a pressure relief valve cover, a pressure relief water stop pad, and a rocker arm. The pressure relief valve seat is arranged at the junction of the water inlet pipe and the water discharge pipe, and a pressure relief port where the water inlet pipe and the water discharge pipe intersect is provided in the pressure relief valve seat. The water cushion is provided with a pressure relief sealing surface for sealing the pressure relief port, the pressure relief water stop pad is buckled together with the pressure relief valve cover, and a pressure chamber is formed between the pressure relief water stop pad and the pressure relief valve cover, the pressure relief water stop pad is provided with a pressure relief water inlet hole connecting the pressure chamber with the water inlet pipe, the pressure relief valve cover is provided with a pressure relief hole connecting the outside with the pressure chamber, the pressure relief valve cover is buckled on the pressure relief valve seat, the rocker arm is hinged on the pressure relief valve cover, the fixed end of the rocker arm is fixedly connected to the float bucket, and the downward pressure end of the rocker arm is provided with a downward pressure pad for sealing the pressure relief hole.

4. A water pressure activated drain valve according to claim 3, characterized in that: The valve body is provided with an axial cavity and a limit support plate, the limit support plate is provided with an axial hole, the upper part of the telescopic push rod is provided with an axial rod, the axial rod is inserted into the axial hole, the upper part of the axial rod pushes the free end of the lifting rod, the lower part of the telescopic push rod is slidably provided in the axial cavity, and a compression spring is provided between the lower part of the telescopic push rod and the bottom of the axial cavity.

5. A water pressure activated drain valve according to claim 4, characterized in that: An opening is provided at the bottom of the shaft cavity, and a fixed cover is buckled on the opening. One end of the compression spring abuts against the fixed cover, and the other end of the compression spring abuts against the lower part of the telescopic push rod, and the telescopic movement of the telescopic push rod is achieved through the compression spring.

6. A water pressure activated drain valve according to claim 3, characterized in that: The side wall of the float barrel is provided with a strip-shaped slide groove, and the other end of the connecting rod is provided with a slide rod, which is placed in the slide groove to facilitate the float barrel to drive the connecting rod to swing on the valve body.

7. A water pressure activated drain valve according to claim 3, characterized in that: The water inlet pipe and the water outlet pipe are coaxially and horizontally arranged on the valve body, the water outlet pipe is inserted into the water inlet pipe, the water inlet valve seat is arranged on the side of the valve body, the pressure relief valve seat is arranged on the upper part of the valve body, the water inlet pipe and the water discharge pipe are coaxially and vertically arranged on the valve body, the water inlet pipe is inserted into the water discharge pipe, and the water outlet pipe passes through the water discharge pipe horizontally.

8. A water pressure activated drain valve according to claim 3, characterized in that: The swing rod is placed above the free end of the lifting rod, and a through hole is provided on the swing rod for the starting rod to extend into and press down the free end of the lifting rod.

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