Pipe-free backwater resistance-increasing one-way valve and water heater circulating system

Abstract

The invention provides a pipe-free backwater resistance-increasing one-way valve and a water heater circulating system, and belongs to the technical field of domestic hot water circulation. Comprising a valve body and a circulating channel formed in the valve body, and a water blocking assembly is arranged on the valve body; when the pressure in the circulation channel is increased to the preset pressure, the water blocking assembly enables the circulation channel to have a forward conduction state; and when the pressure in the circulating channel is reduced to the preset pressure, the water blocking assembly enables the circulating channel to have a forward high-resistance state. The mechanical water blocking assembly is arranged on the valve body, static pressure in a pipeline is used for storing pressure for the elastic piece when water is not used, the one-way valve is completely conducted in the forward direction, resistance during circulation is reduced, the elastic piece releases pressure when water is used, resistance in a circulation channel is remarkably increased through the water blocking rod, and the gas water heater is prevented from being started by mistake; in addition, two-way cut-off can be achieved, water mixing between cold water and hot water is avoided, and meanwhile circulation interruption cannot be caused when other users use cold water in the circulation process.

Description

Technical Field

[0001] The present invention relates to the technical field of domestic hot water circulation, and particularly relates to a non-pipe return water resistance increasing one-way valve and a water heater circulation system. Background Art

[0002] The non-pipe return water system installs a one-way valve at the very end of the hot water pipe (usually at the washbasin), connecting the cold water pipe and the hot water pipe in series. When returning water, since the cold water pipe is closed, a loop is formed. By turning on the circulation pump of the gas water heater, the cold water in the hot water pipe enters the cold water pipe, and the cold water in the cold water pipe enters the gas water heater for heating, ultimately filling the hot water pipe with hot water to achieve the purpose of not having to discharge cold water. This one-way valve non-pipe return water system is suitable for families that have already been decorated, especially in cases where there is no pre-reserved return water pipe. It is not only easy to install but also does not require re-piping. Using a single semi-pipe circulation will not cause the cold water pipe to be filled with hot water, and it is deeply liked by everyone.

[0003] The existing water heater circulation system, as Figure 13 shown, the non-pipe return water system with a one-way valve 115 needs to meet a condition, that is: the water resistance of the hot water pipe 114 reaching the washbasin water outlet end 116 should be greater than the water resistance of the cold water pipe 113 reaching the washbasin water outlet end, and after opening the cold water at the washbasin water outlet end 116, the water flow rate of the hot water pipe 114 should be less than the start-up flow rate of the gas water heater 111. However, in the actual situation, the household pipe layout is complex, and there are many families where the water resistance of the hot water pipe 114 to the washbasin water outlet end 116 is small, or the water pressure in the user's home is high. In this case, if the cold water at the washbasin water outlet end 116 is opened, more water will flow along the one-way valve 115 from the hot water pipe 114. When the flow rate of the hot water pipe 114 is greater than the start-up flow rate of the gas water heater 111, it will cause the gas water heater 111 fan to start and even cause the circulation pump 112 to start, not only causing waste of energy but also causing great trouble to the user. Therefore, a non-pipe return water resistance increasing one-way valve and a water heater circulation system are proposed. Summary of the Invention

[0004] The present invention provides the following technical solutions: A non-pipe return water resistance increasing one-way valve includes a valve body and a circulation channel formed inside the valve body, and a water resistance component is provided on the valve body; When the pressure in the circulation channel increases to a preset pressure, the water resistance component makes the circulation channel have a forward conduction state; When the pressure in the circulation channel decreases to a preset pressure, the water resistance component makes the circulation channel have a forward high resistance state.

[0005] Preferably, the water blocking component includes a water storage cavity communicated with the circulation channel. An isolation member is arranged in the water storage cavity. A water blocking rod is installed on one side of the isolation member close to the circulation channel and a stress surface is formed. An elastic member is installed on the side of the isolation member away from the circulation channel.

[0006] Preferably, a through hole facing the water blocking rod is arranged inside the circulation channel. A valve plate surface is arranged on the side of the water blocking rod away from the isolation member. The valve plate surface is used to block the through hole.

[0007] Preferably, an elastic telescopic component is installed between the water blocking rod and the valve plate surface. When the pressure in the circulation channel increases, the elastic telescopic component reduces the pressure exerted by the valve plate surface on the through hole. When the pressure in the circulation channel decreases, the elastic telescopic component increases the pressure exerted by the valve plate surface on the through hole.

[0008] Preferably, the elastic telescopic component includes a sliding rod slidably inserted inside the water blocking rod. A limiting block is fixedly connected to one end of the sliding rod located inside the water blocking rod. The other end of the sliding rod is fixedly connected to the valve plate surface. A telescopic spring is installed between the limiting block and the inner wall of the water blocking rod.

[0009] Preferably, it further includes a one-way valve core installed in the circulation channel. The one-way valve core includes a sealing valve plate, a sliding member and a mounting frame. The through hole is arranged on the mounting frame. The sealing valve plate forms the valve plate surface. The sliding rod corresponds to the sliding position of the sliding member.

[0010] Preferably, it further includes a limiting member. The water blocking rod penetrates through the limiting member and is slidably connected to the limiting member. A water passing channel is arranged on the limiting member.

[0011] Preferably, the valve body includes a first pipe section, a rigid protection tank and a second pipe section that are sequentially communicated. Both the first pipe section and the second pipe section extend into the interior of the rigid protection tank. The isolation member and the elastic member form an elastic pipe and are fixedly communicated between the first pipe section and the second pipe section. A protrusion is integrally formed on the inner wall of the elastic pipe to form the water blocking rod.

[0012] Preferably, a water heater circulation system includes a storage type small water heater, a cold water pipeline, a hot water pipeline, a water using end, a circulation pump and the above-mentioned pipe-free return water resistance increasing one-way valve. The pipe-free return water resistance increasing one-way valve is installed between the water inlet end of the storage type small water heater and the cold water pipeline.

[0013] Preferably, a water heater circulation system includes the above-mentioned pipe-free return water resistance increasing one-way valve.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, by setting a mechanical water blocking component on the valve body, when not in use, the static pressure in the pipeline is used to store pressure in the elastic component, and the tubeless return water resistance increasing one-way valve has a forward conduction state and a reverse conduction state, reducing the resistance during circulation. When using water, the elastic component releases pressure, and the resistance in the circulation channel is significantly increased through the water blocking rod, avoiding mis-starting of the gas water heater due to excessive water flow.

[0015] In the above solution, by reasonably setting the elastic force of the elastic component, when using water, the valve plate surface can be driven by the elastic component to block the through hole in the valve body, so as to achieve double-way cut-off, avoiding water mixing between cold water and hot water, and when other people use cold water during the hot water circulation process, the circulation pump can also push open the valve plate surface to avoid interruption of hot water circulation.

[0016] In the above solution, by installing an elastic telescopic component between the water blocking rod and the valve plate surface, when not in use, the pressure in the circulation channel increases, and the elastic telescopic component can reduce the pressure exerted by the valve plate surface on the through hole. When using water, the pressure in the circulation channel decreases, and the elastic telescopic component increases the pressure exerted by the valve plate surface on the through hole, so as to better realize the function of the one-way valve, and the hot water circulation can be easily carried out after the circulation pump starts, improving the stability of the one-way valve in actual application and better adapting to the situation of unstable pressure in users' homes. Brief Description of the Drawings

[0017] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0018] Figure 1 It is a schematic structural diagram of the circulation state after the installation of the tubeless return water resistance increasing one-way valve; Figure 2 It is a three-dimensional structural diagram of the tubeless return water resistance increasing one-way valve for realizing resistance increase; Figure 3 It is a schematic structural diagram of the tubeless return water resistance increasing one-way valve for opening hot water after installation; Figure 4 It is a schematic structural diagram of the tubeless return water resistance increasing one-way valve for opening cold water after installation; Figure 5 It is an exploded structural diagram of the tubeless return water resistance increasing one-way valve for realizing double-way blocking; Figure 6 It is a half-sectional structural diagram of the tubeless return water resistance increasing one-way valve for realizing double-way blocking; Figure 7 It is a schematic structural diagram of the circulation state of the tubeless return water resistance increasing one-way valve for realizing double-way blocking; Figure 8 It is a schematic structural diagram of the tubeless return water resistance increasing one-way valve for opening hot water when realizing double-way blocking; Figure 9 Structural schematic diagram of opening cold water for the non-pipe return water resistance increasing one-way valve to achieve bidirectional sealing; Figure 10 Structural schematic diagram of the non-pipe return water resistance increasing one-way valve using an elastic tube; Figure 11 Structural schematic diagram of the non-pipe return water resistance increasing one-way valve used in combination with a small electric water heater; Figure 12 Structural schematic diagram of installing a toilet in the circulation system of the non-pipe return water resistance increasing one-way valve; Figure 13 Structural schematic diagram of the existing water heater circulation system; Figure 14 Structural schematic diagram of adding a telescopic component to the water blocking rod of the non-pipe return water resistance increasing one-way valve; Figure 15 Structural schematic diagram of installing the water blocking rod of the non-pipe return water resistance increasing one-way valve at the cold water pipeline; Figure 16 Structural schematic diagram of the water blocking component of the non-pipe return water resistance increasing one-way valve.

[0019] [Reference Signs] 1. Valve body; 2. Circulation channel; 3. Water blocking component; 4. Water storage cavity; 5. Isolation member; 6. Water blocking rod; 7. Stress surface; 8. Limiting member; 9. Water passing channel; 10. Through hole; 11. Elastic member; 101. Valve plate surface; 102. Water inlet point; 103. Slide rod; 104. Limiting block; 105. Telescopic spring; 401. Cylinder body; 402. Plug cap; 12. Water heater; 13. Circulation pump; 14. Cold water pipeline; 15. Hot water pipeline; 16. Water using end; 17. One-way valve core; 1701. Sealing valve plate; 1702. Sliding member; 1703. Mounting frame; 1704. Threaded step groove; 1705. Mounting port; 111. First pipe section; 112. Hard protection tank; 113. Second pipe section; 114. Elastic tube; 211. Piston tank body; 212. First control valve; 213. Second control valve; 214. Piston detection sensor; 215. Toilet; 216. Washing machine.

[0020] As shown in the figure, in order to clearly show the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for schematic purposes and is not intended to limit the present invention to this specific structure, device, and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. Detailed Embodiments

[0021] The following will describe in detail a pipe-free return water resistance increasing one-way valve and a water heater circulation system provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0022] It should be noted that in the specification, references to "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining embodiments to describe a specific feature, structure, or characteristic, implementing such feature, structure, or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0023] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather can alternatively, at least in part depending on the context, allow for the existence of other factors that may not be explicitly described.

[0024] It can be understood that the meanings of "on...", "above...", and "over..." in the present disclosure should be interpreted in the broadest manner, such that "on..." not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above..." or "over..." not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0025] Furthermore, spatial relative terms such as "under...", "below...", "lower", "above...", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the accompanying drawings. Spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device may be oriented in other ways, and the spatial relative descriptive terms used herein may be interpreted correspondingly.

[0026] The present invention provides a pipe-free return water resistance increasing one-way valve, which is applied to a domestic hot water circulation system, such as Figures 1-16As shown in the figure, the hot water circulation system includes an existing water heater 12, a circulation pump 13, a cold water pipeline 14, a hot water pipeline 15 and a water using end 16. Hereinafter, the tubeless circulation system of a common gas water heater is taken as an example for illustration. The water using end 16 is the washbasin faucet in the bathroom. The tubeless return water resistance increasing one-way valve is installed between the cold water pipeline 14 and the hot water pipeline 15 of the water using end 16 to form a hot water circulation system.

[0027] As Figures 1-4 shown in the figure, in this embodiment, a tubeless return water resistance increasing one-way valve includes a valve body 1 and a circulation channel 2 formed in the valve body 1. A water resistance component 3 is arranged on the valve body 1. The water resistance component 3 includes a water storage cavity 4 communicated with the circulation channel 2. An isolation member 5 is arranged in the water storage cavity 4. A water resistance rod 6 is installed on one side of the isolation member 5 close to the circulation channel 2 and a stress surface 7 is formed. The gap between the stress surface 7 and the circulation channel 2 can allow water to pass through, so that the stress surface 7 is subjected to the water pressure. An elastic member 11 is installed on the side of the isolation member 5 far from the circulation channel 2; When the stress surface 7 is subjected to the static pressure in the circulation channel 2, the isolation member 5 and the water resistance rod 6 move to the side far from the circulation channel 2 and compress the elastic member 11. When the stress surface 7 is subjected to the dynamic pressure in the circulation channel 2, the restoring force of the elastic member 11 makes the isolation member 5 and the water resistance rod 6 move towards the circulation channel 2; Specifically, the circulation channel 2 and the water storage cavity 4 can be vertically connected or obliquely connected. The isolation member 5 is a piston which can slide and seal along the inner wall of the water storage cavity 4 to form a water cavity and a control cavity. The water resistance rod 6 is a rigid rod and is fixedly connected with the isolation member 5. The isolation member 5 is larger than the diameter of the water resistance rod 6 and forms a stress surface 7. The elastic member 11 is a spring and is fixed in the control cavity; Before installation, the pressure of the elastic member 11 makes the water resistance rod 6 enter the circulation channel 2 with the maximum conduction resistance. After installation, as Figure 1 shown in the figure, due to the static pressure in the pipeline acting on the stress surface 7, the isolation member 5 and the water resistance rod 6 move to the side far from the circulation channel 2 and compress the elastic member 11 to store pressure. At this time, the circulation channel 2 has a forward conduction state and a reverse conduction state. As Figure 1 shown in the figure, after the circulation pump 13 starts to circulate, the cold water in the hot water pipeline 15 enters the cold water pipeline 14, and the cold water in the cold water pipeline 14 enters the water heater 12 for heating until the hot water pipeline 15 is filled with hot water to realize hot water circulation; As Figure 4 shown in the figure, when the cold water at the water using end 16 is turned on, the flow rate in the pipeline increases and the pressure decreases significantly. At this time, the restoring force of the elastic member 11 makes the isolation member 5 and the water resistance rod 6 move towards the circulation channel 2. Due to the blockage of the water resistance rod 6, the resistance in the circulation channel 2 will be significantly increased, thereby reducing the flow rate flowing from the hot water pipeline 15 and preventing the gas water heater from starting; The above-mentioned pipeless return water resistance-increasing one-way valve is used to prevent cold water from entering the hot water pipe and to prevent the water blocking rod 6 from being unable to reversely block the circulation channel 2. A one-way valve core 17 of existing structure is also installed in the circulation channel 2. The one-way valve core 17 enables the circulation channel 2 to have a forward conduction state and a reverse cutoff state. Before installation, the static pressure in the system and the dynamic pressure when the cold water of the water end 16 is turned on are tested by a pressure gauge, and the elastic force of the spring is selected so that when the force surface 7 is subjected to static pressure, the water blocking rod 6 moves as far as possible to the water storage chamber 4 to minimize the resistance during circulation. When the force surface 7 is subjected to dynamic pressure, the elastic force of the spring makes the water blocking rod 6 move as far as possible to the circulation channel 2. At this time, the larger the cross-section of the water blocking rod 6 and the circulation channel 2 is matched, the better, so as to maximize the resistance in the circulation channel 2 when the cold water is turned on and reduce the flow rate; Here, the selection of spring directly affects the working performance and stability of the one-way valve. The material of the spring determines its elasticity and durability. Commonly used spring materials include stainless steel, high-temperature spring alloy wire, oil quenched and tempered alloy spring steel wire, etc. These materials can ensure that the spring has good life, stability and corrosion resistance.

[0028] The elastic force of the spring needs to be designed and calculated according to the area of the force-bearing surface 7 and the dynamic pressure and static pressure of the pipeline. The calculation of the elastic force involves factors such as the geometric size of the spring, the elastic modulus of the material, and the working temperature, so as to ensure that the one-way valve can work stably within the set pressure range. The fatigue strength of the spring needs to be taken into account, and a suitable spring structure and material need to be selected to extend the service life of the spring. At the same time, the coordination between the spring and the isolation member 5 needs to be considered to ensure that they can work together. In this embodiment, the one-way valve core 17 is installed at the hot water end of the circulation channel 2, which has a better effect. In this way, when the water-blocking rod 6 moves, the change in water flow reduces the impact on the hot water. The elastic member 11 can also be gas that is flushed into the control chamber through the air valve.

[0029] like Figures 5-9 As shown, in this embodiment, the isolation member 5 is a diaphragm, and the installation and fixing method of the water blocking rod 6 and the diaphragm can refer to the structure of existing valves and expansion tanks.

[0030] In order to increase the stability of the water blocking rod 6, Figure 6 As shown, in this embodiment, the inner wall of the isolation member 5 close to the circulation channel 2 is fixedly connected to the limiting member 8, the water blocking rod 6 passes through the limiting member 8 and is slidably connected to the limiting member 8, and a water flow channel 9 is provided on the limiting member 8. The water pressure is applied to the force surface 7 from the water flow channel 9, and the sliding of the water blocking rod 6 is made more stable through the limiting member 8.

[0031] In order to adapt to different water pressures and facilitate production, such as Figures 1-9As shown, in this embodiment, the water storage chamber 4 includes a cylinder body 401 and a plug cap 402. The cylinder body 401 is fixedly connected to the valve body 1. The elastic member 11 is installed between the plug cap 402 and the isolation member 5. The plug cap 402 is used to adjust the pressure exerted by the elastic member 11 on the isolation member 5. Here, the elastic member 11 is a spring. The plug cap 402 is threadedly connected to the cylinder body 401. The spring contacts the top end of the plug cap 402. When the plug cap 402 is threadedly connected to the cylinder body 401, sufficient gaps should be left to allow air to be discharged when the isolation member 5 moves away from the circulation channel 2, and to allow air to quickly enter when the isolation member 5 approaches the circulation channel 2. Or the threaded connection between the plug cap 402 and the cylinder body 401 can also be sealed, and the compressed air can also act as the elastic member 11.

[0032] During use, when the cold water is turned on at the water-using end 16, the water flows and the pressure will decrease. At this time, the restoring force of the spring causes the isolation member 5 and the water-blocking rod 6 to move towards the circulation channel 2. When it is found that the gas water heater 12 starts, rotate the plug cap 402 to make the plug cap 402 move downward and compress the spring, thereby increasing the pressure exerted by the spring on the isolation member 5, making the water-blocking rod 6 move more into the circulation channel 2, increasing the resistance, and reducing the water flow from the hot water pipe 15.

[0033] In order to enable the water-blocking assembly 3 to achieve the function of the one-way valve core 17, as Figures 5-9 shown, in this embodiment, a through hole 10 facing the force-receiving surface 7 is provided inside the circulation channel 2. The through hole 10 is generally smaller than the diameter of the circulation channel 2 and is formed by opening a hole in the partition fixed in the circulation channel 2 (such as the structure of an existing globe valve). A valve plate surface 101 larger than the through hole 10 is fixedly connected to the side of the water-blocking rod 6 away from the isolation member 5. A sealing gasket can be installed on the lower side of the valve plate surface 101. The valve plate surface 101 is larger than the diameter of the water-blocking rod 6, or the valve plate surface 101 is formed by the bottom of the water-blocking rod 6.

[0034] When the cold water is turned on at the water-using end 16, at this time, the restoring force of the spring causes the isolation member 5 and the water-blocking rod 6 to move towards the circulation channel 2 and block the through hole 10 through the valve plate surface 101, realizing a high-resistance state for the hot water pipe 15 to flow towards the cold water pipe 14; As Figure 9 shown, when the restoring force exerted by the spring on the isolation member 5 and the water-blocking rod 6 is large enough and greater than the pressure at the water inlet point 102, the valve plate surface 101 can completely block the through hole 10, realizing the cut-off of the hot water pipe 15 flowing towards the cold water pipe 14; As Figure 8 shown, when the hot water is turned on at the water-using end 16, it can also make the valve plate surface 101 completely block the through hole 10, thereby realizing the reverse cut-off of the cold water pipe 14 flowing towards the hot water pipe 15.

[0035] As Figure 10As shown, in this embodiment, the valve body 1 includes a first pipe section 111, a rigid protection tank 112, and a second pipe section 113 that are connected in sequence. The first pipe section 111 and the second pipe section 113 both extend into the interior of the rigid protection tank 112 and are fixedly connected through an elastic pipe 114. The water-blocking component is composed of the elastic pipe 114, and exhaust small holes may be provided on the rigid protection tank 112; A water-blocking rod 6 is formed by the inner wall of the elastic pipe 114 bulging towards the middle. When not installed, the bulges in the middle can fit together. When the pressure in the circulation channel 2 increases to a preset pressure, the elastic pipe 114 expands, increasing the inner diameter. Gas is discharged from multiple exhaust small holes and presses against the inner wall of the rigid protection tank 112 (or the gas is compressed until the pipeline static pressure is reached), causing the elastic pipe 114 to store pressure. When cold water or hot water is turned on, the pressure in the circulation channel 2 decreases to the preset pressure, and the contraction force of the elastic pipe 114 causes the inner diameter to shrink or close, realizing the functions described above; This method is to prevent cold water from entering the hot water pipe, and an existing one-way valve core 17 is also installed in the circulation channel 2.

[0036] As Figure 11 and Figure 12 As shown, in this embodiment, a zero-waiting hot water circulation system is proposed. The system includes a water heater 12, a circulation pump 13, a cold water pipeline 14, a hot water pipeline 15, a water usage end 16, and a small storage water heater.

[0037] Among them, the circulation pump 13 is an automatic booster pump. The small storage electric water heater includes a controller, a piston tank body 211, an inlet water temperature sensor, a first control valve 212, a second control valve 213, and a piston detection sensor 214. The drainage end of the piston tank body 211 is connected to the cold water pipeline 14 through the above-mentioned tubeless return water resistance increasing one-way valve (or a common hollow heating tank body. After cold water enters, it is heated by electric heating or the circulation pump 13, and the temporarily stored cold water is heated to an appropriate temperature. The temperature sensor replaces the piston detection sensor 214 to detect the water temperature in the hollow heating tank body. After the heat drops to a certain level, the first control valve 212 and the second control valve 213 are opened); When first used, the first control valve 212 and the second control valve 213 are closed. At this time, when the hot water faucet at the water usage end 16 is opened, the water in the cold water pipeline 14 starts to flow. Due to the decrease in static pressure, the spring will push the valve plate surface 101 to block the through hole 10. During the process of blocking the through hole 10, the flow rate in the cold water pipeline 14 will decrease. At this time, the pressure will increase again, causing the valve plate surface 101 to move away from the through hole 10. During the process of the valve plate surface 101 moving away from the through hole 10, the flow rate will increase again, and the pressure will decrease again until a balanced state is reached (the valve plate surface 101 can be Figure 2The bottom structure in it prevents vibration. At this time, the pressure of the main water inlet pipe resists the spring, with a large resistance and a small water flow. However, the cold water in the cold water pipeline 14 will also enter the interior of the piston tank body 211 and push out the stored hot water from the water-using end 16 through the piston inside. When the piston detection sensor 214 detects that the piston inside the piston tank body 211 reaches the preset position, the controller opens the first control valve 212. At this time, the water flow will flow along the hot water pipeline 15, and at the same time, the automatic booster pump starts to circulate, and the water heater 12 is started to heat. The total water flow will be larger, and the dynamic pressure will also decrease accordingly. At this time, the restoring force of the spring pushes the valve plate surface 101 to completely block the through hole 10, achieving cut-off. At this time, the water in the cold water pipeline 14 is prevented from entering the interior of the piston tank body 211, and the water flow will all flow along the hot water pipeline 15 until the temperature sensor at the water inlet end of the second control valve 213 detects that the temperature is appropriate. The controller closes the first control valve 212 and opens the second control valve 213 to achieve the relay of hot water, realizing the functions of zero waiting and zero cold water. When the hot water at the water-using end 16 is turned off, the pressure in the pipeline increases. At this time, this pipe-free return water resistance-increasing one-way valve will automatically open until the reverse heat storage of the piston tank body 211 is completed. Finally, the first control valve 212 and the second control valve 213 are closed, waiting for the next use; As Figure 12 shown, in this embodiment, a toilet 215 and a washing machine 216 are also installed on the cold water pipeline 14 of the hot water circulation system. During the process of the user turning on the hot water circulation, the use of the toilet 215 and the washing machine 216 by other users will also cause the pressure to decrease. Although the valve plate surface 101 will also completely block the through hole 10, since the circulation pump 13 can increase the pressure, if a booster pump is used instead, the output pressure of the booster pump is relatively high, which will cause the pressure of the hot water pipeline 15 to be relatively high. After overcoming the elastic force of the spring, it can also push open the valve plate surface 101, so that the hot water circulation will not be interrupted; As Figure 14 shown, in this embodiment, in order to improve the stability of actual application and better adapt to the situation of unstable pressure in the user's home, an elastic telescopic component is installed between the water-blocking rod 6 and the valve plate surface 101; The elastic telescopic component includes a slide rod 103 arranged on one side of the water-blocking rod 6. One end of the slide rod 103 is slidably inserted into the interior of the water-blocking rod 6 and fixedly connected with a limit block 104. A telescopic spring 105 is installed between the limit block 104 and the inner top wall of the water-blocking rod 6. The other end of the slide rod 103 is fixedly connected with the valve plate surface 101; After installation, due to the action of the static pressure in the pipeline on the stress surface 7, the isolation member 5 and the water-blocking rod 6 move to the side away from the circulation channel 2 and compress the elastic member 11 to store pressure. At this time, the limit block 104 slides downward inside the water-blocking rod 6, and the restoring force of the telescopic spring 105 can always block the through-hole 10 by the valve plate surface 101. As the water pressure increases, the elastic force of the telescopic spring 105 is smaller. When the circulation pump 13 starts to circulate, it can easily push open the valve plate surface 101 to realize hot water circulation; When the water using end 16 turns on cold water, the flow rate in the pipeline increases and the pressure decreases significantly. At this time, the restoring force of the elastic member 11 makes the isolation member 5 and the water-blocking rod 6 move towards the circulation channel 2. At this time, the limit block 104 slides upward inside the water-blocking rod 6, and the water-blocking rod 6 compresses the telescopic spring 105, increasing the pressure on the valve plate surface 101 through the telescopic spring 105, thereby increasing the force to push open the valve plate surface 101, reducing the flow rate flowing from the hot water pipeline 15, and avoiding the start of the gas water heater.

[0038] As Figure 15 and Figure 16 shown, in this embodiment, in order to reduce the influence of the movement of the water-blocking rod 6 and the isolation member 5 on the water flow and follow the existing manufacturing process of the H-type check valve, it is convenient for processing and production; The check valve core 17 includes a sealing valve plate 1701, a sliding member 1702 and a mounting bracket 1703. The through-hole 10 is arranged on the mounting bracket 1703, and the function of the valve plate surface 101 is realized by the sealing valve plate 1701. An installation opening 1705 is provided at the cold water pipeline 14 of the valve body 1. A threaded step groove 1704 is provided on the right side of the cylinder body 401, and the threaded step groove 1704 is in threaded sealing connection with the installation opening 1705. The position of the sliding rod 103 corresponds to that of the sliding member 1702, so that the sliding rod 103 can press on the sliding member 1702. Since the water-blocking rod 6 is located in the cold water pipeline 14, the thinner the diameter, the lower the water resistance.

[0039] As Figure 16 shown, in this embodiment, in order to avoid the excessive compression of the telescopic spring 105 caused by the excessive pressure of the elastic member 11 before installation in the pipeline and resulting in failure, the limit block 104 can penetrate through the front and rear sides of the water-blocking rod 6, and the maximum distance of movement to the left is less than the installation distance on the left side of the telescopic spring 105 (or the isolation member 5 is blocked by the water passing channel 9). In this way, after installation, the pressure of the elastic member 11 pushes the isolation member 5, making the water-blocking rod 6, the sliding rod 103, the sliding member 1702, the sealing valve plate 1701 and the valve body 1 in hard contact, avoiding the infinite compression of the telescopic spring 105; Taking a hot water circulation system composed of a 16-liter gas water heater, a user water pressure of 0.4 MPa, and a 4-point PPR water pipe hot melt as an example, the hot water flow rate is 6 liters / min. According to Figure 14The check valve is designed and manufactured and installed at the washbasin in the farthest bathroom. The performance of the check valve for pipe-free return water with increased resistance is tested under water pressure fluctuations. The test results show that the greater the water consumption of the user, the better the effect of increasing the resistance to the circulation channel 2, and the smaller the water flow; thus, the mis-start rate of the zero-cold water gas water heater can be reduced. When hot water is used, due to the increased resistance of the circulation channel, the hot water pressurization effect of the zero-cold water gas water heater can be significantly improved; The above check valve for pipe-free return water with increased resistance can also be used in a return water system with a return pipe laid to improve the hot water pressurization effect and reduce the return water volume during hot water pressurization.

[0040] The present invention covers any alternatives, modifications, equivalent methods and solutions made within the essence and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without these detailed descriptions. In addition, well-known methods, processes, procedures, components and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0041] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements can be made without departing from the principle of the present invention, and these improvements and refinements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A pipe-free return water resistance increasing check valve, comprising a valve body and a circulation channel formed within the valve body, characterized in that, A water-blocking component is provided on the valve body; When the pressure in the circulation channel increases to a preset pressure, the water-blocking component enables the circulation channel to have a forward conduction state; When the pressure in the circulation channel decreases to a preset pressure, the water-blocking component enables the circulation channel to have a forward high-resistance state.

2. The non-pipe return water resistance increasing one-way valve according to claim 1, characterized in that, The water-blocking component includes a water storage cavity communicated with the circulation channel. An isolation member is arranged in the water storage cavity. A water-blocking rod is installed on one side of the isolation member close to the circulation channel and a stress surface is formed. An elastic member is installed on the side of the isolation member away from the circulation channel.

3. The non-pipe return water resistance increasing one-way valve according to claim 2, wherein, A through hole facing the water-blocking rod is arranged inside the circulation channel. A valve plate surface is arranged on the side of the water-blocking rod away from the isolation member, and the valve plate surface is used to block the through hole.

4. The non-pipe return water resistance increasing one-way valve according to claim 3, wherein An elastic telescopic component is installed between the water-blocking rod and the valve plate surface. When the pressure in the circulation channel increases, the elastic telescopic component reduces the pressure exerted by the valve plate surface on the through hole. When the pressure in the circulation channel decreases, the elastic telescopic component increases the pressure exerted by the valve plate surface on the through hole.

5. The non-pipe return water resistance increasing check valve according to claim 4, characterized in that, The elastic telescopic component includes a sliding rod slidably inserted inside the water-blocking rod. A limiting block is fixedly connected to one end of the sliding rod located inside the water-blocking rod. The other end of the sliding rod is fixedly connected to the valve plate surface. A telescopic spring is installed between the limiting block and the inner wall of the water-blocking rod.

6. The non-pipe return water resistance increasing one-way valve according to claim 5, characterized in that, It further includes a one-way valve core installed in the circulation channel. The one-way valve core includes a sealing valve plate, a sliding member and a mounting frame. The through hole is arranged on the mounting frame. The sealing valve plate forms the valve plate surface, and the sliding rod corresponds to the sliding position of the sliding member.

7. The non-pipe return water resistance increasing one-way valve according to claim 2, wherein It further includes a limiting member. The water-blocking rod penetrates through the limiting member and is slidably connected to the limiting member. A water passing channel is arranged on the limiting member.

8. The non-pipe return water resistance increasing one-way valve according to claim 2, characterized in that, The valve body includes a first pipe section, a hard protection tank and a second pipe section that are sequentially communicated. Both the first pipe section and the second pipe section extend into the hard protection tank. The isolation member and the elastic member form an elastic pipe and are fixedly communicated between the first pipe section and the second pipe section. A protrusion is integrally formed on the inner wall of the elastic pipe to form the water-blocking rod.

9. A water heater circulation system, characterized in that, It includes a storage-type small water heater, a cold water pipeline, a hot water pipeline, a water-using end, a circulation pump and the pipe-free return water resistance increasing one-way valve according to any one of claims 1-3 and 7-8. The pipe-free return water resistance increasing one-way valve is installed between the water inlet end of the storage-type small water heater and the cold water pipeline.

10. A water heater circulation system, characterized in that, It includes the pipe-free return water resistance increasing one-way valve according to any one of claims 1-8.

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