Automatic water inlet valve based on water outlet pressure change

Abstract

The invention provides an automatic water inlet valve based on water outlet pressure change, which comprises a main valve body and a main valve cover, a main valve diaphragm is arranged between the main valve body and the main valve cover, a lower valve body is arranged at the bottom end of the main valve body, a middle isolation diaphragm is arranged between the main valve body and the lower valve body, and a water outlet cavity is formed among the main valve diaphragm, the main valve body and the middle isolation diaphragm. A water inlet cavity surrounding the water outlet cavity is formed between the upper portion of the main valve body and the main valve diaphragm, a threaded rod is fixedly connected to the center of the upper isolation diaphragm, the center of the middle isolation diaphragm and the center of the lower isolation diaphragm in a penetrating mode, a pilot valve is installed at the center of the main valve diaphragm and comprises a pilot valve seat and a pilot valve element which are matched with each other, and the pilot valve element is fixedly connected with the threaded rod. According to the automatic water inlet valve, the multiple cavities are formed, the threaded rods capable of moving up and down are arranged in the cavities, the threaded rods are driven to move through pressure changes in the cavities, and therefore the pilot valve and the main valve are opened and closed, and automatic opening and closing of the automatic water inlet valve are achieved.

Description

Technical Field

[0001] The present invention relates to a water inlet valve, and particularly to an automatic water inlet valve based on the change of the outlet water pressure. Background Art

[0002] At present, solar water heaters are widely used, and the water inlet control of solar water heaters has always relied on manual operation. There is often a phenomenon that water overflows from the top pipe of the water heater, which not only causes waste of water resources but also is not conducive to environmental control.

[0003] In actual use, there are often occasions where the water supply is automatically shut off according to the change of the water supply height. At present, in the field of automatic control, a pressure sensor is mostly used to detect the water supply height, and the closing of the water supply valve is controlled through an electric signal. However, such a device requires power supply and a series of components such as a pressure sensor and a solenoid valve, which is relatively cumbersome and has a high cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic water inlet valve based on the change of the outlet water pressure in view of the above-mentioned deficiencies of the prior art. The automatic water inlet valve has a simple structure, is easy to use, realizes the opening and closing of the pilot valve and the main valve by means of water pressure, does not use electrical components, does not require power supply, has a low cost, has a good use effect, can be reused, is easy to install and recycle, and can be widely applied.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is: an automatic water inlet valve based on the change of the outlet water pressure, characterized in that it includes a main valve body and a main valve cover, the main valve body and the main valve cover are fixedly connected by a second screw, a main valve diaphragm is arranged between the main valve body and the main valve cover, the edge of the main valve diaphragm is clamped by the main valve body and the main valve cover, the main valve body, the main valve cover and the main valve diaphragm form a main valve, the bottom end of the main valve body is threadedly connected with a lower valve body, a middle isolation diaphragm is arranged between the main valve body and the lower valve body, the edge of the middle isolation diaphragm is clamped by the main valve body and the lower valve body, an outlet water cavity is formed between the main valve diaphragm, the main valve body and the middle isolation diaphragm, the cross section of the outlet water cavity is convex, the outlet water cavity is composed of an upper cylindrical cavity and a lower cylindrical cavity, the diameter of the upper cylindrical cavity is smaller than that of the lower cylindrical cavity, a water outlet is arranged on one side of the outlet water cavity, the water outlet is connected to the water inlet pipe of the solar water heater, and the pressure in the outlet water cavity is the same as the pressure in the water tank of the solar water heater.

[0006] An inlet water cavity surrounding the outlet water cavity is arranged between the upper part of the main valve body and the main valve diaphragm, the inlet water cavity surrounds the outside of the upper cylindrical cavity, the outer diameter of the inlet water cavity is equal to the diameter of the lower cylindrical cavity, and a water inlet is arranged on one side of the inlet water cavity, and the water inlet is connected to the tap water pipe.

[0007] When the main valve is closed, the inlet water cavity is disconnected from the outlet water cavity; when the main valve is opened, the inlet water cavity is communicated with the outlet water cavity, the tap water pipe is communicated with the water tank of the solar water heater, and the tap water pipe injects water into the water tank of the solar water heater.

[0008] The bottom end of the lower valve body is fixedly installed with a lower spring cover through a third screw. The outer shape of the lower spring cover is concave. A lower isolation diaphragm is arranged between the lower valve body and the lower spring cover. The edge of the lower isolation diaphragm is clamped by the lower valve body and the lower spring cover. A lower valve chamber is formed among the middle isolation diaphragm, the lower valve body and the lower isolation diaphragm. The diameter of the lower valve chamber is equal to that of the upper cylindrical chamber. A lower spring chamber is formed between the lower isolation diaphragm and the lower spring cover. A small hole is arranged on the lower spring chamber to communicate the lower spring chamber with the atmosphere. The pressure in the lower spring chamber is the atmospheric pressure, providing an upward acting force on the lower isolation diaphragm, that is, providing an upward acting force on the threaded rod to maintain the initial position of the pilot valve core.

[0009] The top end of the main valve cover is threadedly connected with an upper valve body. An upper isolation diaphragm is arranged between the main valve cover and the upper valve body. The edge of the upper isolation diaphragm is clamped by the main valve cover and the upper valve body. A main valve upper chamber is formed among the main valve diaphragm, the upper valve body and the upper isolation diaphragm. The main valve upper chamber communicates with the lower valve chamber, providing a balancing acting force for the threaded rod. The communication between the main valve upper chamber and the lower valve chamber can be completed through an external conduit, or can also be achieved through the design of the cavity structure.

[0010] The top end of the upper valve body is fixedly installed with an upper spring cover through a first screw. The outer shape of the upper spring cover is convex. An upper spring chamber is formed among the upper spring cover, the upper valve body and the upper isolation diaphragm. The diameter of the upper spring chamber is equal to that of the upper cylindrical chamber. The upper spring chamber communicates with the water outlet chamber. The communication between the upper spring chamber and the water outlet chamber can be completed through an external conduit, or can also be achieved through the design of the cavity structure.

[0011] A threaded rod is fixedly connected through the centers of the upper isolation diaphragm, the middle isolation diaphragm and the lower isolation diaphragm. Gaskets are closely arranged on both sides of the upper isolation diaphragm, the middle isolation diaphragm and the lower isolation diaphragm. Nuts are arranged outside the gaskets. The nuts are fixedly connected with the threaded rod. The lower isolation diaphragm, the upper isolation diaphragm and the middle isolation diaphragm are fixedly connected with the threaded rod through the nuts and the gaskets. A pilot valve is installed at the center of the main valve diaphragm. The pilot valve includes a mutually cooperating pilot valve core and a pilot valve seat. The pilot valve seat is fixedly connected with the main valve diaphragm. The pilot valve core is fixedly connected with the threaded rod. The pilot valve core, the pilot valve seat and the threaded rod constitute the pilot valve.

[0012] When the pressures in each chamber change, it can drive the threaded rod to move up and down, causing the pilot valve core to move and opening or closing the pilot valve. When the pilot valve is opened, the main valve upper chamber communicates with the water outlet chamber; when the pilot valve is closed and the main valve is closed, the main valve upper chamber is disconnected from the water outlet chamber.

[0013] The top end of the threaded rod is connected with the upper spring cover through an upper spring, and the bottom end of the threaded rod is connected with the lower spring cover through a lower spring.

[0014] Preferably, a lock sleeve is fixedly embedded at the center of the upper spring cover. The lock sleeve is fixedly connected to the upper spring cover by a locking screw and cannot rotate relative to the upper spring cover. A threaded hole is vertically formed at the center of the lock sleeve, and an adjustment knob is threadedly connected in the threaded hole. The adjustment knob is a full-thread screw rod. A spring pressing plate is rotatably installed at the bottom end of the adjustment knob. The spring pressing plate is connected to the upper isolation diaphragm by an upper spring.

[0015] The adjustment knob can be rotated relative to the lock sleeve to drive the spring pressing plate to move up and down, thereby adjusting the compression amount of the upper spring and the force exerted by the upper spring on the threaded rod.

[0016] Preferably, a throttle hole is formed in the main valve diaphragm. The throttle hole is used to communicate the upper cavity of the main valve with the water inlet cavity. When the pilot valve core does not connect the water outlet cavity with the upper cavity of the main valve, the throttle hole makes the pressure on the upper side of the main valve diaphragm equal to the pressure of the water inlet cavity. Since part of the lower side of the main valve diaphragm is the water outlet cavity, the total pressure on the upper side of the main valve diaphragm is greater than the pressure on the lower side finally, making the main valve in a closed state.

[0017] Preferably, a first washer is provided between the upper spring cover and the upper valve body to ensure the sealing performance between the upper spring cover and the upper valve body. A second washer is provided between the upper valve body and the upper isolation diaphragm to prevent the upper isolation diaphragm from deforming when the upper valve body is tightened. A third washer is provided between the middle isolation diaphragm and the lower valve body to prevent the middle isolation diaphragm from deforming when the lower valve body is tightened.

[0018] Preferably, the upper isolation diaphragm, the middle isolation diaphragm and the lower isolation diaphragm have the same diameter, which is equal to the diameter of the flow cross-section of the pilot valve.

[0019] There are a total of 8 acting forces on the threaded rod, specifically the forces on the upper and lower sides of the upper isolation diaphragm, the middle isolation diaphragm, the lower isolation diaphragm and the pilot valve. These 8 acting forces jointly affect the opening and closing state of the pilot valve and the up and down movement trend of the threaded rod, and further affect the opening and closing state of the main valve. In the structural design, the force-bearing areas of the upper isolation diaphragm, the middle isolation diaphragm, the lower isolation diaphragm and the pilot valve are equal, which is convenient for balancing these 8 acting forces.

[0020] The present invention has the following advantages compared with the prior art: A main valve is arranged between a main valve body and a main valve cover, and a pilot valve is arranged on the main valve. The pilot valve includes a pilot valve core and a pilot valve seat installed on the main valve. The pilot valve core is fixedly connected to a threaded rod. A lower valve body and a lower spring cover are sequentially arranged at the lower end of the main valve body, and an upper valve body and an upper spring cover are arranged on the main valve cover in sequence. The main valve body is divided into a water inlet chamber and a water outlet chamber, and a main valve upper chamber is arranged in the main valve cover. The water inlet chamber and the water outlet chamber are separated from the main valve upper chamber by the main valve and the pilot valve. A lower valve chamber and a lower spring chamber are respectively arranged in the lower valve body and the lower spring cover, and the lower valve chamber and the lower spring chamber are separated by a lower separating diaphragm. The lower valve chamber and the water outlet chamber are separated by a middle separating diaphragm. An upper spring chamber is arranged in the upper valve body and the upper spring cover, and the upper valve chamber and the upper spring chamber are separated by an upper separating diaphragm. The threaded rod is fixedly connected to the upper separating diaphragm, the middle separating diaphragm and the lower separating diaphragm, and the threaded rod is connected to the lower spring cover and the upper spring cover through a lower spring and an upper spring respectively. The movement of the threaded rod is driven by the pressure change in each chamber, and the threaded rod drives the pilot valve core to move, opening and closing the pilot valve, thereby affecting the opening and closing of the main valve, realizing the automatic water inlet of the solar water heater, without using electrical components, with low cost, reusable, and can be widely applied.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2 is a top view of the present invention.

[0024] Figure 3 is a bottom view of the present invention.

[0025] Figure 4 is a schematic structural diagram of the connection between the main valve diaphragm and the pilot valve seat in the present invention.

[0026] Figure 5 is Figure 4 the top view of Figure 6 is a top view of the main valve body in the present invention.

[0027] Description of the Reference Numerals: Detailed Embodiments

[0028] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will provide a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0030] As Figures 1 - 5 shown, the present invention provides an automatic water inlet valve based on the change of the outlet water pressure, which includes a main valve body 17 and a main valve cover 12. The main valve body 17 and the main valve cover 12 are fixedly connected by a second screw 13. A main valve diaphragm 14 is arranged between the main valve body 17 and the main valve cover 12. The edge of the main valve diaphragm 14 is clamped by the main valve body 17 and the main valve cover 12. The main valve body 17, the main valve cover 12 and the main valve diaphragm 14 form a main valve. The bottom end of the main valve body 17 is threadedly connected with a lower valve body 20. A middle isolation diaphragm 18 is arranged between the main valve body 17 and the lower valve body 20. The edge of the middle isolation diaphragm 18 is clamped by the main valve body 17 and the lower valve body 20. An outlet water cavity 28 is formed between the main valve diaphragm 14, the main valve body 17 and the middle isolation diaphragm 18. The cross-section of the outlet water cavity 28 is convex-shaped. The outlet water cavity 28 is composed of an upper cylindrical cavity and a lower cylindrical cavity. The diameter of the upper cylindrical cavity is smaller than that of the lower cylindrical cavity. One side of the outlet water cavity 28 is provided with an outlet 29, and the outlet 29 is connected to the water inlet pipe of the solar water heater. The pressure in the outlet water cavity 28 is the same as the pressure in the water tank of the solar water heater.

[0031] An inlet water cavity 26 surrounding the outlet water cavity 28 is arranged between the upper part of the main valve body 17 and the main valve diaphragm 14. The inlet water cavity 26 surrounds the outside of the upper cylindrical cavity, and the outer diameter of the inlet water cavity 26 is equal to the diameter of the lower cylindrical cavity. One side of the inlet water cavity 26 is provided with an inlet 27, and the inlet 27 is connected to the water supply pipe.

[0032] When the main valve is closed, the inlet water cavity 26 is disconnected from the outlet water cavity 28; when the main valve is opened, the inlet water cavity 26 is communicated with the outlet water cavity 28, the water supply pipe is communicated with the water tank of the solar water heater, and the water supply pipe injects water into the water tank of the solar water heater.

[0033] The bottom end of the lower valve body 20 is fixedly installed with a lower spring cover 22 through a third screw 21. The outer shape of the lower spring cover 22 is concave. A lower isolation diaphragm 23 is arranged between the lower valve body 20 and the lower spring cover 22. The edge of the lower isolation diaphragm 23 is clamped by the lower valve body 20 and the lower spring cover 22. A lower valve chamber 30 is formed among the middle isolation diaphragm 18, the lower valve body 20 and the lower isolation diaphragm 23. The diameter of the lower valve chamber 30 is equal to that of the upper cylindrical chamber. A lower spring chamber 31 is formed between the lower isolation diaphragm 23 and the lower spring cover 22. Small holes are arranged on the lower spring chamber 31 to connect the lower spring chamber 31 with the atmosphere. The pressure in the lower spring chamber 31 is the atmospheric pressure, which provides an upward acting force for the lower isolation diaphragm 23, that is, provides an upward acting force for the threaded rod 24 to maintain the initial position of the pilot valve core 15.

[0034] The top end of the main valve cover 12 is threadedly connected with an upper valve body 9. An upper isolation diaphragm 11 is arranged between the main valve cover 12 and the upper valve body 9. The edge of the upper isolation diaphragm 11 is clamped by the main valve cover 12 and the upper valve body 9. A main valve upper chamber 32 is formed among the main valve diaphragm 14, the upper valve body 9 and the upper isolation diaphragm 11. The main valve upper chamber 32 communicates with the lower valve chamber 30 to provide a balancing acting force for the threaded rod 24. The connection between the main valve upper chamber 32 and the lower valve chamber 30 can be completed through an external conduit, or can also be realized through the cavity structure design.

[0035] The top end of the upper valve body 9 is fixedly installed with an upper spring cover 4 through a first screw 7. The outer shape of the upper spring cover 4 is convex. An upper spring chamber 33 is formed among the upper spring cover 4, the upper valve body 9 and the upper isolation diaphragm 11. The diameter of the upper spring chamber 33 is equal to that of the upper cylindrical chamber. The upper spring chamber 33 communicates with the water outlet chamber 28. The connection between the upper spring chamber 33 and the water outlet chamber 28 can be completed through an external conduit, or can also be realized through the cavity structure design.

[0036] A threaded rod 24 is fixedly connected through the centers of the upper isolation diaphragm 11, the middle isolation diaphragm 18 and the lower isolation diaphragm 23. Gaskets are closely arranged on both sides of the upper isolation diaphragm 11, the middle isolation diaphragm 18 and the lower isolation diaphragm 23. Nuts are arranged outside the gaskets and are fixedly connected with the threaded rod 24. The connection between the lower isolation diaphragm 23, the upper isolation diaphragm 11, the middle isolation diaphragm 18 and the threaded rod 24 is completed through the nuts and the gaskets. A pilot valve is installed at the center of the main valve diaphragm 14. The pilot valve includes a mutually cooperating pilot valve core 15 and a pilot valve seat 16. The pilot valve seat 16 is fixedly connected with the main valve diaphragm 14. The pilot valve core 15 is fixedly connected with the threaded rod 24. The pilot valve core 15, the pilot valve seat 16 and the threaded rod 24 constitute the pilot valve.

[0037] When pressure changes occur in each chamber, it can drive the threaded rod 24 to move up and down, causing the pilot valve core 15 to move, thereby opening or closing the pilot valve. When the pilot valve is opened, the upper chamber 32 of the main valve communicates with the water outlet chamber 28; when the pilot valve is closed and the main valve is closed, the upper chamber 32 of the main valve is disconnected from the water outlet chamber 28.

[0038] The top end of the threaded rod 24 is connected to the upper spring cover 4 through the upper spring 6, and the bottom end of the threaded rod 24 is connected to the lower spring cover 22 through the lower spring 25.

[0039] In this embodiment, a lock sleeve 3 is threadedly connected to the center of the upper spring cover 4. A locking screw 1 for fixing the lock sleeve 3 and the upper spring cover 4 is further provided on the lock sleeve 3. A threaded hole is vertically opened at the center of the lock sleeve 3, and an adjustment knob 2 is threadedly connected in the threaded hole. The adjustment knob 2 is a full-thread screw rod. A square is provided at the top end of the adjustment knob 2 for easy rotation and adjustment. The bottom end of the adjustment knob 2 is threadedly connected to a spring pressing plate 5, and the spring pressing plate 5 is connected to the upper isolation diaphragm 11 through the upper spring 6.

[0040] Guide grooves are provided on both sides inside the upper spring cover 4. Protruding portions are provided on both sides of the spring pressing plate 5, and the protruding portions are slidably installed in the guide grooves for limiting the movement of the spring pressing plate 5, so that the spring pressing plate 5 can only move up and down with the adjustment knob 2 and cannot rotate relative to the adjustment knob 2, thereby being able to adjust the compression amount of the upper spring 6 and the force exerted by the upper spring 6 on the threaded rod 24.

[0041] In this embodiment, a throttle hole is opened on the main valve diaphragm 14, and the throttle hole is used to communicate the upper chamber 32 of the main valve with the water inlet chamber 26. When the pilot valve core 15 does not connect the water outlet chamber 28 and the upper chamber 32 of the main valve, the throttle hole makes the pressure on the upper side of the main valve diaphragm 14 equal to the pressure of the water inlet chamber 26. Since part of the lower side of the main valve diaphragm 14 is the water outlet chamber 28, the total pressure on the upper side of the main valve diaphragm 14 is finally greater than the pressure on the lower side, causing the main valve to be in a closed state.

[0042] In this embodiment, a first washer 8 is provided between the upper spring cover 4 and the upper valve body 9 to ensure the sealing between the upper spring cover 4 and the upper valve body 9. A second washer 10 is provided between the upper valve body 9 and the upper isolation diaphragm 11 to prevent the upper isolation diaphragm 11 from being deformed when the upper valve body 9 is tightened. A third washer 19 is provided between the middle isolation diaphragm 18 and the lower valve body 20 to prevent the middle isolation diaphragm 18 from being deformed when the lower valve body 20 is tightened.

[0043] In this embodiment, the upper isolation diaphragm 11, the middle isolation diaphragm 18, and the lower isolation diaphragm 23 have the same diameter, which is equal to the diameter of the flow cross-section of the pilot valve.

[0044] There are a total of eight acting forces on the threaded rod 24, specifically the forces on the upper isolation diaphragm 11, the middle isolation diaphragm 18, the lower isolation diaphragm 23, and the upper and lower sides of the pilot valve. These eight acting forces jointly affect the on-off state of the pilot valve and the upward and downward movement trend of the threaded rod 24, and further affect the on-off state of the main valve. In the structural design, the force-bearing areas of the upper isolation diaphragm 11, the middle isolation diaphragm 18, the lower isolation diaphragm 23, and the pilot valve are made equal to facilitate the balance of these eight acting forces.

[0045] Initial installation state; The media in each chamber of the automatic water outlet valve is air. The forces generated by the media in the upper and lower chambers on the upper isolation diaphragm 11, the middle isolation diaphragm 18, the lower isolation diaphragm 23, and the pilot valve are balanced. The resultant force acting on the threaded rod 24 is the difference between the acting forces of the upper spring 33 and the lower spring 25.

[0046] At this time, the acting force exerted by the upper spring 33 on the threaded rod 24 is less than the acting force exerted by the lower spring 25 on the threaded rod 24, that is, the threaded rod 24 is subjected to an upward acting force, and the threaded rod 24 moves upward, and the pilot valve opens.

[0047] Initial water injection process of the solar water heater: After the water inlet 27 of the water inlet chamber 26 starts to let water in, due to the increase in the pressure P in the water inlet chamber 26. 26 At the same time, since the pilot valve is in the open state, the upper chamber 32 of the main valve is connected to the water outlet chamber 28. The pressure in the water inlet chamber 26 is greater than the pressure in the upper chamber 32 of the main valve. The pressure on the lower side of the main valve diaphragm 14 is greater than the pressure on the upper side, and the main valve opens. The water inlet chamber 26 is connected to the water outlet chamber 28, and the water inlet chamber 26 injects water into the water outlet chamber 28. The water outlet chamber 28 injects water into the upper spring chamber 33 and the water tank of the solar water heater.

[0048] At the same time, since the pilot valve is in the open state, and there are small holes on the main valve diaphragm 14 for connecting the water inlet chamber 26 and the upper chamber 32 of the main valve, the water inlet chamber 26 injects water into the upper chamber 32 of the main valve. Since the upper chamber 32 of the main valve is connected to the lower valve chamber 30, the upper chamber 32 of the main valve injects water into the lower valve chamber 30. The pressure P in the upper chamber 32 of the main valve. 32 and the pressure P in the lower valve chamber 30. 30 and the pressure in the water outlet chamber 28 are constantly increasing.

[0049] At this time, the water inlet chamber 26, the water outlet chamber 28, the upper spring chamber 33, the lower valve chamber 30, and the upper chamber 32 of the main valve are connected. Except for the lower spring chamber 31, the media in the remaining chambers is water, and the pressures exerted by each chamber on the adjacent upper isolation diaphragm 11, middle isolation diaphragm 18, lower isolation diaphragm 23, and pilot valve are water pressures.

[0050] The resultant force on the lower isolation diaphragm 23 is the difference in pressure exerted by the media on the upper and lower sides (downward), that is, the difference between the pressure in the water outlet chamber 28 and the atmospheric pressure.

[0051] The resultant force on the threaded rod 24 is: the resultant force on the lower isolation diaphragm 23 (downward), plus the difference in the forces exerted by the upper spring 33 and the lower spring 25 (upward). At this time, the downward force is less than the upward force, maintaining the tendency of the threaded rod 24 to move upward.

[0052] As the water inlet process continues, the pressure in the water outlet chamber 28 gradually increases due to the increase in the water supply height, and the resultant force on the lower isolation diaphragm 23 gradually increases until the resultant force on the lower isolation diaphragm 23 (downward) is equal to the difference in the forces exerted by the upper spring 33 and the lower spring 25 (upward).

[0053] At this time, the water level in the water tank is about to reach the preset height. Since neither the main valve nor the pilot valve is closed, the water tank continues to fill with water, making the resultant force on the lower isolation diaphragm 23 (downward) greater than the difference in the forces exerted by the upper spring 33 and the lower spring 25 (upward). The direction of the resultant force on the threaded rod 24 becomes downward, and the threaded rod 24 moves downward to close the pilot valve.

[0054] However, since there are small holes on the main valve diaphragm 14 for connecting the water inlet chamber 26 and the upper chamber 32 of the main valve, the pressures in the water inlet chamber 26 and the upper chamber 32 of the main valve gradually become the same.

[0055] Since the pressure on the main valve diaphragm 14 from the upper chamber 32 of the main valve is the inlet water pressure, and the main valve diaphragm 14 is also affected by a part of the water outlet pressure from the water outlet chamber 28, the pressures on the upper and lower sides are unbalanced. The main valve diaphragm 14 is subjected to a downward acting force as a whole, causing the main valve to close, disconnecting the water inlet chamber 26 and the water outlet chamber 28, and the water tank stops filling with water, reaching the preset water level.

[0056] It can be seen from this that by rotating the adjustment knob 2 to adjust the compression amount of the upper spring 33, the function of reaching the preset water level can be achieved.

[0057] Through the above steps, the initial water filling of the solar water heater tank is completed.

[0058] During the use of the solar water heater, when the water level in the water tank of the solar water heater gradually decreases, the resultant force on the lower isolation diaphragm 23 (downward) decreases, and then becomes less than the difference in the forces exerted by the upper spring 33 and the lower spring 25 (upward). At this time, the downward force is less than the upward force, and the threaded rod 24 moves upward to open the pilot valve, and the upper chamber 32 of the main valve is connected to the water outlet chamber 28.

[0059] The pressure in the upper chamber 32 of the main valve decreases, and the pressure on the upper side of the main valve diaphragm 14 decreases, causing the main valve to open, connecting the water inlet chamber 26 and the water outlet chamber 28, and filling the solar water heater tank with water.

[0060] As the water inlet process continues, the resultant force on the lower isolation diaphragm 23 gradually increases until the resultant force on the lower isolation diaphragm 23 (downward) is equal to the difference between the acting forces of the upper spring 33 and the lower spring 25 (upward).

[0061] At this time, the water level in the water tank is about to reach the preset height. Since neither the main valve nor the pilot valve is closed, the water tank continues to fill with water, making the resultant force on the lower isolation diaphragm 23 (downward) greater than the difference between the acting forces of the upper spring 33 and the lower spring 25 (upward). The direction of the resultant force on the threaded rod 24 becomes downward, and the threaded rod 24 moves downward to close the pilot valve.

[0062] However, since there are small holes on the main valve diaphragm 14 for connecting the water inlet chamber 26 and the upper chamber 32 of the main valve, the pressures in the water inlet chamber 26 and the upper chamber 32 of the main valve gradually become the same.

[0063] The main valve diaphragm 14 is subjected to the acting force exerted by the downward movement of the threaded rod 24, causing the main valve to close, disconnecting the water inlet chamber 26 from the water outlet chamber 28, and the water tank stops filling with water, reaching the preset water level.

[0064] During the use of the solar water heater, the switching process of the pilot valve and the main valve is cycled to achieve automatic water injection into the water tank of the solar water heater.

[0065] The above are only the preferred embodiments of the present invention and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent variations made to the above embodiments according to the technical essence of the invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An automatic water inlet valve based on the change of outlet water pressure, characterized in that, It includes a main valve body (17) and a main valve cover (12). The main valve body (17) is fixedly connected to the main valve cover (12). A main valve diaphragm (14) is provided between the main valve body (17) and the main valve cover (12). A lower valve body (20) is provided at the bottom end of the main valve body (17). A middle isolation diaphragm (18) is provided between the main valve body (17) and the lower valve body (20). An outlet chamber (28) is formed among the main valve diaphragm (14), the main valve body (17) and the middle isolation diaphragm (18). An outlet (29) is provided on one side of the outlet chamber (28). An inlet chamber (26) surrounding the outlet chamber (28) is provided between the upper part of the main valve body (17) and the main valve diaphragm (14). An inlet (27) is provided on one side of the inlet chamber (26). A lower spring cover (22) is provided at the bottom end of the lower valve body (20). A lower isolation diaphragm (23) is provided between the lower valve body (20) and the lower spring cover (22). A lower valve chamber (30) is formed among the middle isolation diaphragm (18), the lower valve body (20) and the lower isolation diaphragm (23). A lower spring chamber (31) is formed between the lower isolation diaphragm (23) and the lower spring cover (22). An upper valve body (9) is provided at the top end of the main valve cover (12). An upper isolation diaphragm (11) is provided between the main valve cover (12) and the upper valve body (9). A main valve upper chamber (32) is formed among the main valve diaphragm (14), the upper valve body (9) and the upper isolation diaphragm (11). The main valve upper chamber (32) communicates with the lower valve chamber (30). An upper spring cover (4) is provided at the top end of the upper valve body (9). An upper spring chamber (33) is formed among the upper spring cover (4), the upper valve body (9) and the upper isolation diaphragm (11). The upper spring chamber (33) communicates with the outlet chamber (28). A threaded rod (24) is fixedly connected through the centers of the upper isolation diaphragm (11), the middle isolation diaphragm (18) and the lower isolation diaphragm (23). A pilot valve is installed at the center of the main valve diaphragm (14). The pilot valve includes a mutually cooperating pilot valve core (15) and a pilot valve seat (16). The pilot valve seat (16) is fixedly connected to the main valve diaphragm (14). The pilot valve core (15) is fixedly connected to the threaded rod (24). The top end of the threaded rod (24) is connected to the upper spring cover (4) through an upper spring (6). The bottom end of the threaded rod (24) is connected to the lower spring cover (22) through a lower spring (25).

2. The automatic water inlet valve based on the change of the water outlet pressure according to claim 1, wherein A lock sleeve (3) is threadedly connected to the center of the upper spring cover (4). A locking screw (1) for fixing the lock sleeve (3) and the upper spring cover (4) is further provided on the lock sleeve (3). A threaded hole is vertically opened at the center of the lock sleeve (3). An adjusting knob (2) is threadedly connected in the threaded hole. The adjusting knob (2) is a full-thread screw rod. The bottom end of the adjusting knob (2) is threadedly connected to a spring pressing plate (5). The spring pressing plate (5) is connected to the upper isolation diaphragm (11) through an upper spring (6). Guide grooves are provided on both sides inside the upper spring cover (4). The two sides of the spring pressing plate (5) are installed in the guide grooves in a limited sliding manner.

3. The automatic water inlet valve based on the change of the water outlet pressure according to claim 1, characterized in that, A throttle hole is formed in the main valve diaphragm (14), and the throttle hole is used to communicate the upper cavity (32) of the main valve with the water inlet cavity (26).

4. The automatic water inlet valve based on the change of the water outlet pressure according to claim 1, characterized in that, A first washer (8) is arranged between the upper spring cover (4) and the upper valve body (9), a second washer (10) is arranged between the upper valve body (9) and the upper isolation diaphragm (11), and a third washer (19) is arranged between the middle isolation diaphragm (18) and the lower valve body (20).

5. An automatic water inlet valve based on the change of outlet water pressure according to claim 1, characterized in that, The upper isolation diaphragm (11), the middle isolation diaphragm (18) and the lower isolation diaphragm (23) have the same diameter, which is equal to the diameter of the flow-through cross-section of the pilot valve.

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