Double-control mechanical flush valve for squatting toilet

Abstract

The application discloses a double-control mechanical flushing valve for a squatting toilet and belongs to the technical field of squatting toilets. The double-control mechanical flushing valve for the squatting toilet comprises a water outlet control chamber and a starting control chamber. A main control piston is slidably arranged in the water outlet control chamber. One end of the main control piston is communicated with the starting control chamber. A stroke piston is further arranged in the water outlet control chamber. First and second starting devices are arranged in the starting control chamber. When the first starting device is pressed, the first starting device is communicated with the main control piston, the main control piston slides to abut against the stroke piston, and the water is drained. When the second starting device is pressed, the main control piston is simultaneously communicated with the stroke piston, the stroke piston moves away from the main control piston, the stroke of the main control piston is increased, and the water drainage capacity is increased. The stroke size is controlled through the arrangement of the two pistons, so that different water outlet capacities are realized.

Description

Technical Field

[0001] This invention relates to the field of squat toilet technology, and more particularly to a dual-control mechanical flush valve for squat toilets. Background Technology

[0002] Different places use different flush valves for toilets. Currently, there are three types of toilet flush valves: sensor-operated, foot-operated, and manual. There is also a type of toilet that uses a water tank for flushing. The principles of these flush valves are all different. Public toilets are places with a large flow of people, so water conservation is the primary consideration. Secondly, they utilize the force of a large flow of water to flush away dirt in one go. The principle is that the water tank is placed at a high position, using the potential energy of the water to work. Take the currently popular sensor-operated flush valve as an example. The principle of the sensor-operated flush valve is that the flush valve senses the heat of the human body. When the heat disappears, the flush is activated. Automatic flushers are equipped with infrared receiving probes. When a human body approaches, the probe can receive infrared rays emitted by the human body with sufficient intensity. The control circuit activates the flush solenoid valve and keeps it on for two seconds, flushing once. When the person leaves, the infrared rays received by the probe decrease, the internal control circuit resets, and the solenoid valve remains on for three seconds, flushing once more.

[0003] Existing squat toilets generally require a water tank to temporarily store water. In order to save water, they are usually equipped with two buttons to control the water flow. However, the existing water tanks take up a lot of space, and there are also mechanical direct current flush valves that consume a lot of water. The electric flush valves require power and cannot be used when the power is off. Summary of the Invention

[0004] To address the aforementioned problems, this invention aims to solve the problems described above. One objective of this invention is to provide a dual-control mechanical flush valve for squat toilets that solves the problems mentioned above, eliminating the need for a water tank and featuring dual-button control of the water flow.

[0005] The solution adopted in this embodiment is to provide a dual-control mechanical flushing valve for squat toilets, including a water outlet control chamber and an activation control chamber. A main control piston is slidably disposed in the water outlet control chamber, and one end of the main control piston is connected to the activation control chamber.

[0006] The water outlet control chamber is also equipped with a stroke piston, and the start-up control chamber is equipped with a first start-up device and a second start-up device.

[0007] When the first starting device is pressed, the first starting device is connected to the main control piston, and the main control piston slides to abut against the stroke piston, opening the drain;

[0008] When the second starting device is pressed, the main control piston and the stroke piston are simultaneously connected, and the stroke piston moves away from the main control piston, so as to increase the stroke of the main control piston and increase the drainage volume.

[0009] A preferred technical solution is that the main control piston is sleeved outside the stroke piston, and a limiting rod is provided at one end of the stroke piston near the main control piston. The main control piston is slidably connected to the limiting rod, and the main control piston abuts against the limiting rod when it moves to the bottom.

[0010] A preferred technical solution is that a stroke chamber is provided at the bottom of the water outlet control chamber, the stroke piston is slidably connected in the stroke chamber, a stroke spring is provided at the bottom of the stroke chamber, one end of the stroke spring abuts against the stroke piston, and in the initial state, the stroke piston is located at the end of the stroke chamber closest to the main control piston.

[0011] A preferred technical solution is that a return spring is provided in the water outlet control chamber, one end of the return spring is fixed and the other end abuts against the main control piston, so that the main control piston has a tendency to move away from the stroke piston.

[0012] A preferred technical solution is that the side wall of the water outlet control chamber is provided with a water inlet channel and a water outlet channel, and a sealing element is provided in the middle of the main control piston. In the initial state, the sealing element is located between the water inlet channel and the water outlet channel to isolate the water inlet channel and the water outlet channel.

[0013] A preferred technical solution is that the main control piston has a piston through hole on its side wall, the piston through hole connecting the water inlet channel and the internal chamber of the main control piston, and the water outlet control chamber has a first water outlet hole at its bottom, the first water outlet hole connecting the internal chamber of the main control piston and the first starting device.

[0014] A preferred technical solution is that the stroke piston is provided with a connecting groove, the connecting groove connecting the internal chamber of the main control piston and the internal chamber of the stroke piston, and the bottom of the water outlet control chamber is provided with a second water outlet hole, the second water outlet hole connecting the internal chamber of the stroke piston and the second starting device.

[0015] A preferred technical solution is that the start control chamber is provided with a delayed closing chamber, a delayed piston is slidably disposed in the delayed closing chamber, a delayed through hole is provided on the delayed piston, the delayed through hole connects the inner and outer sides of the delayed piston, the inner chamber of the main control piston is connected to the outer side of the delayed piston, and the inner side of the delayed piston is connected to the first start device.

[0016] A preferred technical solution is that an inner drain port is provided on the outer side of the delay piston, and a closing plug is provided at the end of the delay piston. In the initial state, the closing plug is located in the inner drain port to close the drainage of the delay closing chamber. A delay spring is provided on the inner side of the delay piston, and one end of the delay spring abuts against the delay piston so that the delay piston has a tendency to move towards the inner drain port.

[0017] A preferred technical solution is that the sidewall of the delayed closing cavity is provided with a first starting water channel and a second starting water channel. The first starting water channel connects the inner side of the delayed piston to the first starting device, and the second starting water channel connects the inner side of the delayed piston to the second starting device. The second starting device is provided with a blocking mechanism, which blocks the connection between the delayed closing cavity and the second starting water channel when the second starting device is not pressed.

[0018] A preferred technical solution is that the isolation mechanism includes a blocking piston and a blocking spring. The blocking piston is slidably connected in the second starting water channel. A conical opening is provided at one end of the second starting water channel near the delayed closing cavity. One end of the blocking spring is fixed, and the other end abuts against the blocking piston, so that the blocking piston has a tendency to move towards the conical opening. In the initial state, the blocking piston is stuck in the conical opening to block the communication between the second starting water channel and the delayed closing cavity.

[0019] A preferred technical solution is that both the first starting device and the second starting device include a starting button, a starting spring, and a starting sealing block; the starting button is respectively sleeved on the ends of the first starting channel and the second starting channel, and the starting sealing block is fixed inside the starting button. When not pressed, the starting sealing block is located at the ends of the first starting channel and the second starting channel, closing the first starting channel and the second starting channel. The starting spring and the starting sealing block cause the starting sealing block to have a tendency to move towards the ends of the first starting channel and the second starting channel.

[0020] A preferred technical solution further includes an outer casing and a water inlet protection mechanism. The outer casing is provided with a water inlet interface and a water outlet interface. The water outlet interface is connected to the drainage channel. The water inlet interface is connected to the water inlet end of the water inlet protection mechanism. The water outlet end of the water inlet protection mechanism is connected to the water inlet channel.

[0021] A preferred technical solution is that the water inlet protection mechanism includes a flow-limiting piston, a cut-off piston, and a protective housing. The flow-limiting piston and the cut-off piston are slidably connected inside the protective housing. A flow-limiting tube is provided in the middle of the protective housing. The flow-limiting piston and the cut-off piston are respectively located on both sides of the flow-limiting tube. The water inlet interface and the water inlet channel are respectively located on both sides of the flow-limiting tube. When water flows through the flow-limiting tube, the flow-limiting piston and the cut-off piston move towards the flow-limiting tube to reduce the water inlet volume.

[0022] The dual-control mechanical flush valve for squat toilets of the present invention has the following technical advantages:

[0023] This application discloses a dual-control mechanical flushing valve for squat toilets, comprising a water outlet control chamber and an activation control chamber. A main control piston is slidably disposed within the water outlet control chamber, with one end of the main control piston connected to the activation control chamber. A stroke piston is also disposed within the water outlet control chamber, and a first activation device and a second activation device are disposed within the activation control chamber. When the first activation device is pressed, it connects to the main control piston, causing the main control piston to slide until it abuts against the stroke piston, thus opening the drain. When the second activation device is pressed, the main control piston and the stroke piston are simultaneously activated, causing the stroke piston to move away from the main control piston, thereby increasing the stroke of the main control piston and increasing the drainage volume. By controlling the stroke size through the two pistons, different water volumes can be achieved.

[0024] Other features and advantages of the invention will become clear when reading the following description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the dual-control mechanical flush valve for squat toilets provided in a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the water outlet control chamber structure provided in a specific embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the start-up control room structure provided in a specific embodiment of the present invention;

[0029] In the picture:

[0030] 1. Outer shell; 11. Inlet port; 12. Outlet port; 2. Inlet protection mechanism; 21. Protective shell; 22. Cut-off piston; 23. Flow limiting piston; 24. Flow limiting tube; 3. Outlet control chamber; 31. Stroke chamber; 32. Inlet channel; 33. Drainage channel; 34. First outlet hole; 35. Second outlet hole; 4. Start control chamber; 41. First start device; 42. Second start device; 401. Start button; 402. Start spring; 403. Start 43. Dynamic sealing block; 44. Delayed closing chamber; 45. Inner drain outlet; 46. Delayed piston; 47. Delayed through hole; 48. Closing plug; 49. Delayed spring; 40. First starting water channel; 41. Second starting water channel; 42. Isolation mechanism; 43. Blocking spring; 44. Blocking piston; 5. Main control piston; 55. Reset spring; 56. Seal; 57. Piston through hole; 68. Stroke piston; 69. Limiting rod; 60. Stroke spring; 61. Connecting groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0032] The following description, in conjunction with the accompanying drawings and embodiments, details the dual-control mechanical flush valve for the squat toilet.

[0033] like Figure 1-3 As shown, the present invention provides a dual-control mechanical flushing valve for squat toilets, comprising a water outlet control chamber 3 and an activation control chamber 4. A main control piston 5 is slidably disposed within the water outlet control chamber 3, and one end of the main control piston 5 is connected to the activation control chamber 4. A stroke piston 6 is also disposed within the water outlet control chamber 3. A first activation device 41 and a second activation device 42 are disposed within the activation control chamber 4. When the first activation device 41 is pressed, the first activation device 41 is connected to the main control piston 5, and the main control piston 5 slides to abut against the stroke piston 6, opening the drainage. After the first activation device 41 is pressed, it is connected to the outside, causing the pressure on that side of the main control piston 5 to decrease. Under the action of water pressure, the main control piston 5 is pushed to move, thereby opening the drainage channel 33. The main control piston 5 stops when it abuts against the stroke piston 6. At this time, the opening size is not fully opened, and the water flow is relatively small.

[0034] When the second starting device 42 is pressed, the main control piston 5 and the stroke piston 6 are simultaneously activated. The stroke piston 6 moves away from the main control piston 5, increasing the stroke of the main control piston 5 and thus increasing the drainage volume. After the second starting device 42 is pressed, the pressure at one end of both the stroke piston 6 and the main control piston 5 decreases simultaneously, causing the stroke piston 6 to contract and increasing the distance between the main control piston 5 and the stroke piston 6. Under the action of water pressure, the main control piston 5 is pushed to move, thereby opening the drainage channel 33. The main control piston 5 stops when it comes into contact with the stroke piston 6. At this point, the opening size is maximized, increasing the drainage volume. Furthermore, due to the increased stroke of the main control piston 5, the opening time and reset time also increase, thereby increasing the drainage time and significantly increasing the drainage volume.

[0035] To limit the movement of the main control piston 5 and ensure its coaxial operation with the stroke piston 6, the main control piston 5 is sleeved on the outside of the stroke piston 6. A limiting rod 61 is provided at the end of the stroke piston 6 closest to the main control piston 5. The main control piston 5 is slidably connected to the limiting rod 61, and when the main control piston 5 reaches its lowest point, it abuts against the limiting rod 61. The coaxial installation of the main control piston 5 and the stroke piston 6 saves installation space and increases the drainage and reset speed of water inside the main control piston 5. The movement of the main control piston 5 requires the drainage of internal water. The stroke piston 6, located inside the main control piston 5, occupies a portion of its internal space. During drainage, the main control piston 5 and the stroke piston 6 drain water simultaneously through two channels, resulting in rapid drainage and a quick response. The simultaneous movement of the main control piston 5 and the stroke piston 6 increases the stroke of the main control piston 5 and the drainage time, thereby increasing the drainage volume.

[0036] To allow the stroke piston 6 to reset, a stroke chamber 31 is provided at the bottom of the water outlet control chamber 3. The stroke piston 6 is slidably connected to the stroke chamber 31, and a stroke spring 62 is provided at the bottom of the stroke chamber 31. One end of the stroke spring 62 abuts against the stroke piston 6. In the initial state, the stroke piston 6 is located at the end of the stroke chamber 31 closest to the main control piston 5. After pressing the second starting device 42, the pressure on the side of the stroke chamber 31 connected to the second starting device 42 decreases. The stroke piston 6 is pushed and contracted under the pressure of tap water, thereby squeezing the stroke spring 62 to contract. After the pressure difference decreases, the stroke piston 6 resets under the action of the stroke spring 62.

[0037] To allow the main control piston 5 to reset, a return spring 51 is installed inside the water outlet control chamber 3. One end of the return spring 51 is fixed, and the other end abuts against the main control piston 5, causing the main control piston 5 to tend to move away from the stroke piston 6. After the pressure difference on both sides of the main control piston 5 decreases, the main control piston 5 resets under the action of the return spring 51. The return spring 51 is initially in a slightly compressed state, possessing a certain elasticity to hold the main control piston 5 at the water outlet, preventing water leakage.

[0038] To facilitate control of drainage flow, the side wall of the water outlet control chamber 3 is provided with an inlet channel 32 and a drain channel 33. A sealing element 52 is located in the middle of the main control piston 5. Initially, the sealing element 52 is positioned between the inlet channel 32 and the drain channel 33 to isolate them. The water outlet control chamber 3 is cylindrical, with a step before the inlet channel 32 and the drain channel 33, making the diameter of the water outlet control chamber 3 where the drain channel 33 is located smaller. The sealing element 52 is located on the outer side wall of the main control piston 5, and its diameter is larger than that of the water outlet control chamber 3 where the drain channel 33 is located. When the main control piston 5 is pressed against the step by the return spring 51, the sealing element 52 abuts against the step, isolating the water outlet control chamber 3 and preventing water from flowing from the inlet channel 32 to the drain channel 33. The inlet channel 32 and the drain channel 33 are located at different axial positions of the main control piston 5, allowing the flow time of both channels to be controlled by the stroke of the main control piston 5 as it moves along the axis. At the same time, the stroke distance of the main control piston 5 can be controlled to control the water output. When the first start device 41 is pressed, the main control piston 5 retracts to the last position, and the position of the seal 52 can be set so that it is located between the water inlet channels 32, so that the water inlet channels 32 are not fully opened. When the second start device 42 is pressed, the stroke increases, so that the water inlet channels 32 are fully opened and the water inlet volume is increased.

[0039] To balance the pressure during reset, the main control piston 5 has a piston through hole 53 on its side wall, which connects the water inlet channel 32 to the internal chamber of the main control piston 5. The bottom of the water outlet control chamber 3 has a first water outlet 34, which connects the internal chamber of the main control piston 5 to the first starting device 41. When the first starting device 41 is pressed, it connects to the outside, reducing the pressure in the internal chamber of the main control piston 5. Under the pressure of tap water, the main control piston 5 is pushed to contract. After being pressed, the first starting device 41 quickly resets, creating a sealed environment in the internal chamber of the main control piston 5. The internal chamber of the main control piston 5 is connected to the tap water through the piston through hole 53. Simultaneously, under the action of the reset spring 51, water is slowly injected into the internal chamber of the main control piston 5, and then it returns to its initial position under the push of the reset spring 51. During the process of the main control piston 5 opening and closing, the toilet is constantly flushing.

[0040] Furthermore, the stroke piston 6 is provided with a connecting groove 63, which connects the internal chamber of the main control piston 5 and the internal chamber of the stroke piston 6. The bottom of the water outlet control chamber 3 is provided with a second water outlet 35, which connects the internal chamber of the stroke piston 6 and the second starting device 42. The internal chamber of the stroke piston 6 is connected to the internal chamber of the main control piston 5 via the connecting groove 63, and then to tap water via the piston through-hole 53. When the second starting device 42 is pressed, both the internal chambers of the main control piston 5 and the stroke piston 6 are simultaneously connected to the outside, reducing pressure. Under the pressure of the tap water, both the main control piston 5 and the stroke piston 6 contract simultaneously, increasing the stroke of the main control piston 5 and the drainage time.

[0041] To facilitate control of the stroke time and set an appropriate drainage time, a delayed closing chamber 43 is provided in the start-up control chamber 4. A delayed piston 44 is slidably disposed in the delayed closing chamber 43. The delayed piston 44 has a delayed through hole 441, which connects the inner and outer sides of the delayed piston 44. The internal chamber of the main control piston 5 is connected to the outer side of the delayed piston 44, and the inner side of the delayed piston 44 is connected to the first start-up device 41. Further, an inner drain port 431 is provided on the outer side of the delayed piston 44, and a closing plug 442 is provided at the end of the delayed piston 44. In the initial state, the closing plug 442 is located in the inner drain port 431 to close the delayed closing chamber 43 for drainage. A delayed spring 443 is provided on the inner side of the delayed piston 44, with one end of the delayed spring 443 abutting against the delayed piston 44 to give the delayed piston 44 a tendency to move towards the inner drain port 431. When the start device is pressed, a pressure difference is generated on both sides of the delay piston 44. Under the pressure of the tap water, the delay piston 44 is pushed inward to contract. At this time, the delay piston 44 opens the channel to the outside, allowing water in the water outlet control chamber 3 to be discharged quickly. This allows the main control piston 5 and the stroke piston 6 to contract quickly, and the main control piston 5 remains in the maximum opening position for a certain period of time. After the first start device 41 is pressed, the inside of the delay piston 44 is connected to the outside, creating a pressure difference, which pushes the delay piston 44. The first start device 41 will quickly reset and close the connection to the outside, but at this time the delay piston 44 is open, so the inside of the main control piston 5 is still connected to the outside. At this time, the main control piston 5 is in the maximum open position, and the drainage volume is the maximum. The delay piston 44 is filled with water through the delay through hole 441 and resets under the action of the delay spring 443 until the delay piston 44 is fully reset and the inner drain port 431 is completely closed. At this time, the main control piston 5 begins to reset, thus achieving maximum water volume flushing for a period of time.

[0042] Preferably, the sidewall of the delayed closing cavity 43 is provided with a first starting water channel 45 and a second starting water channel 46. The first starting water channel 45 connects the inner side of the delayed piston 44 to the first starting device 41, and the second starting water channel 46 connects the inner side of the delayed piston 44 to the second starting device 42. The second starting device 42 is provided with a blocking mechanism 47. When the second starting device 42 is not pressed, the blocking mechanism 47 blocks the connection between the delayed closing cavity 43 and the second starting water channel 46. The blocking mechanism 47 ensures that pressing the first starting device 41 alone will not affect the movement of the stroke piston 6, achieving independent small-flow drainage. When the second starting device 42 is pressed, the blocking mechanism 47 opens, synchronously connecting the first starting device 41, which is equivalent to pressing the first starting device 41 and the second starting device 42 simultaneously.

[0043] Further, the isolation mechanism 47 includes a blocking piston 472 and a blocking spring 471. The blocking piston 472 is slidably connected in the second starting water channel 46. The second starting water channel 46 has a conical opening at one end near the delayed closing chamber 43. One end of the blocking spring 471 is fixed, and the other end abuts against the blocking piston 472, causing the blocking piston 472 to tend to move towards the conical opening. In the initial state, the blocking piston 472 is stuck in the conical opening to block the communication between the second starting water channel 46 and the delayed closing chamber 43. After pressing the second starting device 42, the pressure of the tap water pushes the blocking piston 472 open. After the second starting device 42 resets, the stroke piston 6 is still draining water. At this time, the water in the stroke piston 6 enters the inner chamber of the delayed piston 44 through the conical opening. When the stroke piston 6 stops moving, the blocking spring 471 pushes the blocking piston 472 to reset.

[0044] Preferably, both the first starting device 41 and the second starting device 42 include a starting button 401, a starting spring 402, and a starting sealing block 403. The starting button 401 is respectively sleeved on the ends of the first starting water channel 45 and the second starting water channel 46. The starting sealing block 403 is fixed inside the starting button 401. When not pressed, the starting sealing block 403 is located at the ends of the first starting water channel 45 and the second starting water channel 46, closing the first starting water channel 45 and the second starting water channel 46. The starting spring 402 and the starting sealing block 403 cause the starting sealing block 403 to tend to move towards the ends of the first starting water channel 45 and the second starting water channel 46. The starting button 401 is a commonly used button on the market. When pressed, it opens the starting sealing block 403, allowing the first starting water channel 45 and the second starting water channel 46 to communicate with the outside. The outside is located in the cavity of the outer shell 1. This water enters the outer shell 1 and is directly discharged through the drainage channel 33. After the start button 401 is released, the start sealing block 403 can quickly reset under the action of the start spring 402. The start button 401 can also be opened by pulling, depending on the actual button structure.

[0045] To ensure that the internal mechanism of the flush valve is not damaged due to excessive pressure, it also includes an outer shell 1 and a water inlet protection mechanism 2. The outer shell 1 is provided with a water inlet interface 11 and a water outlet interface 12. The water outlet interface 12 is connected to the drainage channel 33. The water inlet interface 11 is connected to the water inlet end of the water inlet protection mechanism 2. The water outlet end of the water inlet protection mechanism 2 is connected to the water inlet channel 32.

[0046] Furthermore, the water inlet protection mechanism 2 includes a flow-limiting piston 23, a cut-off piston 22, and a protective housing 21. The flow-limiting piston 23 and the cut-off piston 22 are slidably connected inside the protective housing 21. A flow-limiting tube 24 is provided in the middle of the protective housing 21. The flow-limiting piston 23 and the cut-off piston 22 are located on both sides of the flow-limiting tube 24. The water inlet interface 11 and the water inlet channel 32 are located on both sides of the flow-limiting tube 24. When water flows through the flow-limiting tube 24, the flow-limiting piston 23 and the cut-off piston 22 move towards the flow-limiting tube 24 to reduce the water inlet volume. When the pressure is high, the water flows through the flow-limiting tube 24 at high speed, generating a negative pressure at that position. This causes the flow-limiting piston 23 and the cut-off piston 22 to move towards the flow-limiting tube 24, thereby reducing the cross-sectional area of ​​the flow-limiting tube 24, reducing the water flow rate, preventing high water pressure from acting on the mechanical components for extended periods, and improving their service life.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes that element.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dual-control mechanical flush valve for a squat toilet, comprising: a water outlet control chamber and a starting control chamber, a main control piston slidingly arranged in the water outlet control chamber, one end of the main control piston being in communication with the starting control chamber; a stroke piston arranged in the water outlet control chamber, and a first starting device and a second starting device arranged in the starting control chamber; when the first starting device is pressed, the first starting device is in communication with the main control piston, the main control piston slides to abut against the stroke piston to open the drain; when the second starting device is pressed, the main control piston is in communication with the stroke piston at the same time, the stroke piston moves away from the main control piston to increase the stroke of the main control piston and the amount of water drained; the main control piston is sleeved on the outside of the stroke piston, a limiting top rod is arranged at one end of the stroke piston close to the main control piston, the main control piston is slidingly connected with the limiting top rod, and the main control piston abuts against the limiting top rod when the main control piston moves to the bottom end; a stroke chamber is arranged at the bottom of the water outlet control chamber, the stroke piston is slidingly connected in the stroke chamber, a stroke spring is arranged at the bottom of the stroke chamber, one end of the stroke spring abuts against the stroke piston, and in the initial state, the stroke piston is located at the end of the stroke chamber closest to the main control piston; a reset spring is arranged in the water outlet control chamber, one end of the reset spring is fixed, and the other end of the reset spring abuts against the main control piston to make the main control piston have a movement tendency away from the stroke piston; a water inlet channel and a drain channel are arranged on the side wall of the water outlet control chamber, a sealing element is arranged in the middle of the main control piston, and in the initial state, the sealing element is located between the water inlet channel and the drain channel to separate the water inlet channel and the drain channel; a piston through hole is arranged on the side wall of the main control piston, the piston through hole is in communication with the water inlet channel and the internal chamber of the main control piston, a first water outlet hole is arranged at the bottom of the water outlet control chamber, and the first water outlet hole is in communication with the internal chamber of the main control piston and the first starting device; a communication groove is arranged on the stroke piston, the communication groove is in communication with the internal chamber of the main control piston and the internal chamber of the stroke piston, a second water outlet hole is arranged at the bottom of the water outlet control chamber, and the second water outlet hole is in communication with the internal chamber of the stroke piston and the second starting device. 2.The dual-control mechanical flush valve for a squat toilet according to claim 1, wherein: a delay closing cavity is arranged in the starting control chamber, a delay piston is slidingly arranged in the delay closing cavity, a delay through hole is arranged on the delay piston, the delay through hole is in communication with the inside and outside of the delay piston, the internal chamber of the main control piston is in communication with the outside of the delay piston, and the inside of the delay piston is in communication with the first starting device. 3.The dual-control mechanical flush valve for a squat toilet according to claim 2, wherein: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The outer side of the delay piston is provided with an inner water outlet, and the end of the delay piston is provided with a closing plug, which is located in the inner water outlet in the initial state to close the delay closing chamber for water drainage.

4. The double-control mechanical flush valve for squatting toilet according to claim 2, characterized in that: The side wall of the delay closing chamber is provided with a first starting water channel and a second starting water channel, the first starting water channel is connected with the inner side of the delay piston and the first starting device, and the second starting water channel is connected with the inner side of the delay piston and the second starting device, and the second starting device is provided with a blocking mechanism, which blocks the conduction between the delay closing chamber and the second starting water channel when the second starting device is not pressed.

5. The double-control mechanical flush valve for squatting toilet according to claim 4, characterized in that: The blocking mechanism comprises a blocking piston and a blocking spring, the blocking piston is slidingly connected in the second starting water channel, the second starting water channel is provided with a tapered port at one end close to the delay closing chamber, one end of the blocking spring is fixed, and the other end abuts against the blocking piston, so that the blocking piston has a tendency to move towards the tapered port, and in the initial state, the blocking piston is clamped in the tapered port to block the communication between the second starting water channel and the delay closing chamber.

6. The double-control mechanical flush valve for squatting toilet according to claim 4, characterized in that: The first starting device and the second starting device each comprise a starting button, a starting spring and a starting sealing block, the starting button is sleeved at the end of the first starting water channel and the second starting water channel respectively, the starting sealing block is fixed in the starting button, and in the initial state, the starting sealing block is located at the end of the first starting water channel and the second starting water channel to close the first starting water channel and the second starting water channel, and the starting spring abuts against the starting sealing block, so that the starting sealing block has a tendency to move towards the end of the first starting water channel and the second starting water channel.

7. The double-control mechanical flush valve for squatting toilet according to claim 1, characterized in that: It further comprises an outer shell, and a water inlet protection mechanism, the outer shell is provided with a water inlet interface and a water outlet interface, the water outlet interface is connected with the water outlet channel, the water inlet interface is connected with the water inlet end of the water inlet protection mechanism, and the water outlet end of the water inlet protection mechanism is connected with the water inlet channel.

8. The double-control mechanical flush valve for squatting toilet according to claim 7, characterized in that: The water inlet protection mechanism comprises a flow limiting piston, a cut-off piston and a protection shell, the flow limiting piston and the cut-off piston are both slidingly connected inside the protection shell, a flow limiting pipe is arranged in the middle of the protection shell, the flow limiting piston and the cut-off piston are respectively located on both sides of the flow limiting pipe, the water inlet interface and the water inlet channel are respectively located on both sides of the flow limiting pipe, when water flows through the flow limiting pipe, the flow limiting piston and the cut-off piston both move towards the flow limiting pipe to reduce the water inlet amount.

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