Fluid suction structure and cold end water recovery system of hot water pipe

Abstract

The present invention relates to the technical field of water heating and sanitary ware, and discloses a fluid suction structure and a cold end water recovery system of a hot water pipe, so as to solve the problem of high energy consumption of cold end water in the process of recycling and utilization of water heating and sanitary ware products. The fluid suction structure comprises a tube shell and a flow limiting member. The tube shell is provided with an inlet end, a negative pressure flow channel and an outlet end which are connected in sequence. The flow limiting member is arranged in the tube shell and divides the negative pressure flow channel into a first flow channel and a second flow channel, the first flow channel is located on a side of the flow limiting member close to the inlet end, and the second flow channel is located on a side of the flow limiting member close to the outlet end. The inner wall of the tube shell is arranged at intervals with the flow limiting member to conduct the first flow channel and the second flow channel. Among them, a suction hole connected to the second flow channel is provided at the side wall of the tube shell close to the flow limiting member. When the fluid suction structure is applied to the cold end water recovery system of the hot water pipe, no additional power (such as electricity and motor) is required to drive it, and the energy consumption is negligible, which is conducive to reducing the energy consumption of the cold end water recovery system of the hot water pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of water heating and sanitary ware, and in particular to a fluid suction structure and a cold end water recovery system of a hot water pipeline. Background Art

[0002] Plumbing and sanitary ware products generally have the technical difficulty of water loss at the cold end of the hot water pipe. That is, due to the existence of thermal inertia, the end of the hot water pipe often needs to release a portion of cold water before hot water can be released, thus resulting in a waste of water resources.

[0003] In order to avoid the waste of water resources, a water tank is provided in the related scheme to absorb and store the cold end water in the hot water pipe until the hot water flows out from the outlet end of the hot water pipe, so as to reduce the loss and waste of the cold end water.

[0004] However, when using the cold-end water stored in the water tank, due to the high water pressure in the hot water pipe and the cold water pipe, an additional water pump needs to be installed to return the cold-end water stored in the water tank to the hot water pipe or the cold water pipe. The installation and operation of the water pump still requires additional electrical energy, resulting in high energy consumption. Summary of the invention

[0005] In view of this, the present invention provides a fluid suction structure and a cold-end water recovery system for a hot water pipe, aiming to solve the problem of high energy consumption during the recycling of cold-end water in plumbing and sanitary products.

[0006] On the one hand, the present invention provides a fluid suction structure, including a tube shell and a flow limiting member. The tube shell is provided with an inlet end, a negative pressure flow channel and an outlet end which are connected in sequence. The flow limiting member is arranged in the tube shell and divides the negative pressure flow channel into a first flow channel and a second flow channel, the first flow channel is located on a side of the flow limiting member close to the inlet end, and the second flow channel is located on a side of the flow limiting member close to the outlet end. The inner wall of the tube shell is spaced apart from the flow limiting member to conduct the first flow channel and the second flow channel. Among them, a suction hole connected to the second flow channel is provided on the side wall of the tube shell close to the flow limiting member.

[0007] Beneficial effect: In the tube shell of the fluid suction structure, the present application scheme sets a flow limiter to reduce the flow cross-sectional area near the suction hole, thereby increasing the liquid flow rate to form a low-pressure area or a negative pressure area, so as to suck the fluid outside the suction hole into the second flow channel, and the effect is significant. In addition, by connecting and installing a flow limiter in the tube shell, there is no need to shrink the inner wall of the tube shell, which has the characteristics of simple structure and easy operation and assembly.

[0008] When the fluid suction structure is applied to the cold-end water recovery system of the hot water pipe, by arranging a flowing fluid between the inlet end, the negative pressure flow channel and the outlet end, the collected cold-end water in the water storage tank can be sucked into the second flow channel through the suction hole. No additional power (such as electricity and motor) is required, and the energy consumption is negligible, which is beneficial to reducing the energy consumption of the cold-end water recovery system of the hot water pipeline.

[0009] In an optional embodiment, the flow limiting member is a spherical structure, an ellipsoidal structure or a conical structure.

[0010] Beneficial effect: By setting the flow limiting member to a block structure of a spherical structure, an ellipsoidal structure or a conical structure, it is helpful to further simplify the flow limiting member and the fluid suction structure.

[0011] In an optional embodiment, the fluid suction structure further comprises a suction pipe, wherein a first end of the suction pipe is connected to the suction hole, and a second end of the suction pipe is arranged at a position of the flow restricting member close to the outlet end.

[0012] Beneficial effect: By setting the suction pipe, the fluid can be directly guided from the suction hole to the low-pressure or negative-pressure area (such as the position of the flow-limiting member near the outlet end) through the suction pipe. That is, by setting the suction pipe, a large pressure difference can be made at both ends of the suction pipe. While the fluid is drawn from the suction hole to the low-pressure position of the flow-limiting member near the outlet end, the setting of the suction pipeline can also prevent the fluid in the negative-pressure flow channel from flowing out in the opposite direction through the suction hole.

[0013] In an optional embodiment, a portion of the suction pipe close to the second end is arranged in the flow restriction member.

[0014] Beneficial effect: A channel structure is provided inside the flow limiting component as a part of the suction pipeline, thereby further simplifying the components.

[0015] In an optional embodiment, the fluid suction structure further includes a connecting piece, the flow limiting piece is fixedly installed in the tube shell through the connecting piece, and a portion of the suction pipe close to the first end is arranged in a connecting piece.

[0016] Beneficial effect: By disposing at least part of the suction pipe in the connecting piece, another part of the suction pipe can also be disposed in the flow limiting piece on this basis. The combination of the two further simplifies the number of components and simplifies the structure.

[0017] On the other hand, the present invention also provides a cold end water recovery system for a hot water pipeline, comprising a hot water pipeline, a water storage tank, a first valve, a cold water pipeline, and the fluid suction structure in the above aspect. The hot water pipeline has a water inlet and a water outlet. The water storage tank has a water inlet and a water outlet. The water inlet is connected to the hot water pipeline near the water outlet through the first valve. The inlet and the outlet are connected between the cold water pipeline, and the water outlet is connected to the suction hole.

[0018] Beneficial effect: If you need to release hot water through the hot water pipe for bathing or washing. If the water in the hot water pipe is cooled cold-end water, you can open the first valve to allow the cold-end water in the hot water pipe to flow into the water storage tank through the first valve and the water inlet for storage until the water temperature near the water outlet of the hot water pipe reaches the preset temperature. Close the second valve to allow the hot water in the hot water pipe to flow out through the water outlet. During this process, the cold-end water in the hot water pipe will be collected in the water storage tank for storage, thereby avoiding the loss and waste of cold-end water.

[0019] In the process of using hot water, if the temperature of the hot water needs to be adjusted in coordination with the cold water in the cold water pipeline, the cold water in the cold water pipeline flows through the inlet end, the first flow channel, the flow limiting component, the second flow channel and the outlet end of the fluid suction structure in sequence. When the cold water in the cold water pipeline is accelerated to flow into the second flow channel through the flow limiting component, a low pressure area or even a negative pressure area is formed at one end of the second flow channel close to the flow limiting component, thereby sucking the cold end water in the water storage tank into the cold water pipeline through the suction hole and the drain port to adjust the water temperature in coordination with the hot water in the hot water pipeline. In this process, no external force is required to suck the cold end water in the water storage tank into the cold water pipeline through the fluid suction structure, which neither causes the loss and waste of the cold end water nor requires the consumption of additional energy for the reflux and reuse of the cold end water, and has low energy consumption.

[0020] In an optional embodiment, the first valve is a two-position three-way valve structure, the first end of the first valve is connected to the water inlet of the water storage tank, the second end of the first valve is connected to the water outlet, and the third end of the first valve is used for drainage. And / or, the cold end water recovery system of the hot water pipeline also includes a third valve, and in the cold water pipeline, the third valve is installed downstream of the outlet. Alternatively, the cold end water recovery system of the hot water pipeline also includes a second valve, the second valve is connected to the water outlet, and in the hot water pipeline, the connection between the first valve and the hot water pipeline is located upstream of the second valve.

[0021] Beneficial effect: By setting at least one of the first valve, the second valve and the third valve in the cold-end water recovery system of the hot water pipe, the current state of the recovery system can be flexibly adjusted through the above valves, thereby avoiding wasting cold-end water while ensuring the user's hot water use needs.

[0022] In an optional embodiment, the cold end water recovery system of the hot water pipeline further includes a mixing valve and / or a temperature sensor. An inlet at one end of the mixing valve is connected to the water outlet, and in the cold water pipeline, an inlet at the other end of the mixing valve is connected to a position downstream of the outlet. In the hot water pipeline, the temperature sensor is arranged near the connection between the first valve and the hot water pipeline, and is used to detect the water temperature and output a water temperature parameter signal.

[0023] Beneficial effects: By setting the mixing valve, the ratio of hot water to cold water can be flexibly adjusted, so that users can flexibly adjust the water temperature as needed. By setting a temperature sensor near the water outlet of the hot water pipeline, it is convenient for users to obtain the water temperature parameters near the water outlet.

[0024] In an optional embodiment, the cold end water recovery system of the hot water pipe further includes a controller, the controller is electrically connected to at least the first valve, the controller is configured to have a reflux state and a water outlet state, and the controller switches the reflux state and the water outlet state according to a water temperature parameter signal or a time signal. When the controller is in the reflux state, the controller controls the connection between the water inlet of the water storage tank and the hot water pipeline, and the water outlet is in a closed state. When the controller is in the water outlet state, the controller controls the closure of the water inlet of the water storage tank, and the water outlet is in an open state.

[0025] Beneficial effect: When the controller is in the reflux state, the controller controls the water inlet of the water storage tank to be turned on, and the water outlet of the hot water pipeline is in a closed state to prevent the loss and waste of cold end water in the hot water pipeline.

[0026] When the controller is in the water outlet state, the controller controls the water inlet of the closed water tank, and the water outlet end of the hot water pipeline is in an open state, so that the user can take hot water through the open water outlet end for washing, bathing or cleaning items.

[0027] In an optional embodiment, the cold end water recovery system of the hot water pipe further includes any one of a first one-way valve, a second one-way valve and a third one-way valve. The first one-way valve is connected between the drain port and the suction port. The water storage tank is also provided with a pressure equalizing hole, and the second one-way valve is connected to the pressure equalizing hole to prevent liquid leakage inside the water storage tank. The third one-way valve is connected between the water inlet and the first valve.

[0028] Beneficial effects: The first one-way valve is connected between the drain port and the suction hole. By installing the first one-way valve between the drain port and the suction hole, the cold end water and other fluids can flow out from the drain port through the suction hole, the second flow channel and the cold water pipeline. It can be used for flushing and can also be used to adjust the water temperature with the hot water in the hot water pipeline. And the setting of the first one-way valve can prevent the liquid from flowing into the water storage tank through the drain port in the reverse direction from the suction hole.

[0029] By setting the second one-way valve, air can enter the water tank through the second one-way valve and the pressure equalizing hole, and the air in the water tank can also be discharged through the pressure equalizing hole and the second one-way valve, so that the internal pressure of the water tank is approximately consistent with the atmospheric pressure. However, for the cold end water of the liquid, the setting of the second one-way valve can prevent the cold end water from being discharged from the water tank through the pressure equalizing hole and the second one-way valve, thereby avoiding the waste of water resources.

[0030] By setting the third one-way valve, the cold end water in the water storage tank can be further prevented from flowing back into the hot water pipeline to affect the water temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic structural diagram of a cold-end water recovery system for a hot water pipe according to an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the connection structure of a cold water recovery system for a hot water pipe according to an embodiment of the present invention;

[0034] Figure 3 for Figure 1 A first cross-sectional view of the fluid pumping structure shown in;

[0035] Figure 4 for Figure 1 A second cross-sectional view of the fluid pumping structure shown in;

[0036] Figure 5 for Figure 4 A schematic diagram of a fluid trajectory inside the fluid pumping structure shown in FIG.

[0037] Figure 6 A test platform for the principle of measuring a fluid suction structure provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of the electrical connections of a cold-end water recovery system for a hot water pipe provided in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 100. Cold end water recovery system of hot water pipe;

[0041] 10. Hot water pipeline; 11. Water inlet; 12. Water outlet;

[0042] 20. Water storage tank; 21. Water inlet; 22. Drain outlet; 23. Pressure equalizing hole;

[0043] 31. First valve; 32. Second valve; 33. Temperature sensor; 34. First check valve; 35. Second check valve; 36. Third check valve; 37. Third valve;

[0044] 40. Cold water pipeline;

[0045] 50. Fluid suction structure; 51. Tube shell; 511. Inlet end; 512. Negative pressure flow channel; 5121. First flow channel; 5122. Second flow channel; 513. Outlet end; 514. Suction hole; 52. Flow limiting component; 53. Connecting component; 54. Suction pipe;

[0046] 60. Water heater;

[0047] 70. Mixing valve;

[0048] 80. Controller;

[0049] 01. Self-circulating water supply device; 02. Test bench; 03. Pumping motor speed regulator; 04. Overflow plate; 05. Water stabilizing orifice plate; 06. Constant pressure water tank; 07. Test pipeline; 08. Pressure measuring scale; 09. Pressure measuring tube; 010. Pressure measuring point; 011 Test flow regulating valve; 012. Return funnel. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0053] Plumbing and sanitary products generally have the technical difficulty of water loss at the cold end of the hot water pipe, that is, due to the existence of thermal inertia, the end of the hot water pipe often needs to release a part of cold water before releasing hot water. Generally, this part of the cold water released will be lost in vain, resulting in a waste of water resources.

[0054] According to statistics, in the bathroom of each urban household, in winter (late autumn or early spring when the temperature is low), the hot water pipe needs to release an average of about 15L of cold water every day to get the hot water needed for showering. Take a city with 8 million urban and rural residents as an example. Due to the loss of cold-end water in the hot water pipe, the city will waste 120,000 cubic meters of cold-end water every day, which is equivalent to about 360,000 yuan (2.97 yuan / cubic meter). Taking the period of at least four months (30 days per month) with low temperatures in southern cities each year as an example, the loss of cold-end water resources for showers is equivalent to about 43.2 million yuan, and the water resources lost and wasted are about 14.4 million cubic meters. This not only causes great economic losses, but also wastes the limited water resources per capita.

[0055] At present, the sanitary ware industry mainly installs instant electric heating devices at the outlet of hot water pipes to reduce or avoid the outflow of cold water. However, instant electric heating devices have a large rated power and need to consume more additional electricity to quickly heat the cold water. In addition, high-power electric heating devices also have safety risks such as leakage.

[0056] On this basis, the relevant scheme sets up a water tank to absorb and store the cold end water in the hot water pipe until the hot water flows out of the water outlet of the hot water pipe, so as to reduce the loss and waste of the cold end water. However, when using the cold end water stored in the water tank, due to the high water pressure in the cold water pipe and the hot water pipe, an additional water pump needs to be set up to return the cold end water stored in the water tank to the hot water pipe or the cold water pipe, and the setting and operation of the water pump still consumes additional electricity, which has high energy consumption.

[0057] Combine the following Figures 1 to 7 , describing a fluid suction structure and a cold end water recovery system of a hot water pipe according to an embodiment of the present invention.

[0058] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a cold end water recovery system 100 for a hot water pipeline, including a hot water pipeline 10, a water storage tank 20, a first valve 31, a cold water pipeline 40 and a fluid suction structure 50.

[0059] Combination Figure 1 and Figure 2 The hot water pipeline 10 has a water inlet 11 and a water outlet 12. The cold end water recovery system 100 of the hot water pipeline may include a water heater 60, which may be any one of a gas water heater, an electric water heater, a solar water heater and an air energy water heater. The water inlet 11 is connected to the hot water end of the water heater 60 so that the hot water heated by the water heater 60 flows to the water outlet 12 through the hot water pipeline 10.

[0060] In addition, a heat-insulating water storage tank may be connected to the water inlet end 11 of the hot water pipeline 10 , and hot water may be stored in the heat-insulating water storage tank so that the hot water flows to the water outlet end 12 through the hot water pipeline 10 .

[0061] like Figure 1 and Figure 2 As shown, the water storage tank 20 has a water inlet 21 and a water outlet 22 , and the water inlet 21 is connected to the hot water pipeline 10 near the water outlet 12 through a first valve 31 .

[0062] Combination Figure 3 , the fluid suction structure 50 includes a tube shell 51 and a flow limiting member 52. The tube shell 51 is provided with an inlet end 511, a negative pressure flow channel 512 and an outlet end 513 that are connected. The flow limiting member 52 is arranged in the tube shell 51 and divides the negative pressure flow channel 512 into a first flow channel 5121 and a second flow channel 5122. The first flow channel 5121 is located on a side of the flow limiting member 52 close to the inlet end 511, and the second flow channel 5122 is located on a side of the flow limiting member 52 close to the outlet end 513. The inner wall of the tube shell 51 is spaced apart from the flow limiting member 52 to connect the first flow channel 5121 and the second flow channel 5122. Among them, a suction hole 514 connected to the second flow channel 5122 is provided on the side wall of the tube shell 51 close to the flow limiting member 52. Based on this, combined with Figure 1 and Figure 2 The inlet end 511 and the outlet end 513 are connected between the cold water pipeline 40, and the drain port 22 is connected to the suction hole 514.

[0063] In the cold-end water recovery system 100 of the hot water pipe provided in the embodiment of the present application, if hot water needs to be released through the hot water pipe 10 for bathing or washing. If the water in the hot water pipe 10 is cooled cold-end water, the first valve 31 can be opened to allow the cold-end water in the hot water pipe 10 to flow into the water storage tank 20 through the first valve 31 and the water inlet 21 for storage until the water temperature near the water outlet 12 of the hot water pipe 10 reaches a preset temperature. The first valve 31 is closed to allow the hot water in the hot water pipe 10 to flow out through the water outlet 12. During this process, the cold-end water in the hot water pipe 10 will be collected in the water storage tank 20 for storage, thereby avoiding the loss and waste of cold-end water.

[0064] In the process of using hot water, if the temperature of the hot water needs to be adjusted in coordination with the cold water in the cold water pipeline 40, the cold water in the cold water pipeline 40 flows through the inlet end 511, the first flow channel 5121, the flow limiter 52, the second flow channel 5122 and the outlet end 513 of the fluid suction structure 50 in sequence. When the cold water in the cold water pipeline 40 is accelerated to flow into the second flow channel 5122 through the flow limiter 52, a low pressure area or even a negative pressure area is formed at one end of the second flow channel 5122 close to the flow limiter 52, so that the cold end water in the water storage tank 20 is sucked into the cold water pipeline 40 through the suction hole 514 and the drain port 22 to adjust the water temperature in coordination with the hot water in the hot water pipeline 10. In this process, no external force is required in the process of sucking the cold end water in the water storage tank 20 into the cold water pipeline 40 through the fluid suction structure 50, so that the loss and waste of the cold end water will not be caused, and no additional energy needs to be consumed for the return and reuse of the cold end water, which has low energy consumption.

[0065] It should be noted that in the embodiment of the present application, the fluid suction structure 50 can be applied to the cold end water recovery system 100 of the hot water pipe, and can also be applied as an independent component in other required devices or scenarios, without limitation.

[0066] In the above fluid suction structure 50, in the tube shell 51, the present application scheme reduces the flow area near the suction hole 514 by setting a flow limiter 52, thereby increasing the liquid flow rate to form a low pressure area or a negative pressure area, so as to suck the fluid outside the suction hole 514 into the second flow channel 5122, and the effect is remarkable. In addition, by connecting and installing a flow limiter 52 in the tube shell 51, it is not necessary to shrink the inner wall of the tube shell 51, which has the characteristics of simple structure and easy operation and assembly.

[0067] In some embodiments, Figure 3 and Figure 4 As shown, the flow limiting member 52 is a spherical structure, an ellipsoidal structure or a conical structure.

[0068] By setting the flow limiting member 52 to be a block structure with a spherical structure, an ellipsoidal structure or a conical structure, it is helpful to further simplify the flow limiting member 52 and the fluid suction structure 50.

[0069] For example, taking the case where the flow limiting member 52 is a spherical structure, the diameter of the spherical structure can be set close to the central axis of the tube shell 51, and the two can be parallel or approximately parallel, so that the fluid flows evenly around the spherical structure.

[0070] Taking the case where the flow limiting member 52 is an ellipsoidal structure as an example, the line connecting the two foci of the ellipsoidal structure can be arranged close to the central axis of the tube shell 51 and the two can be made parallel or approximately parallel so that the fluid can flow evenly around the ellipsoidal structure.

[0071] Taking the case where the flow limiting member 52 is a conical structure as an example, at least one side tip of the conical structure is arranged toward the inlet end 511 to reduce fluid resistance.

[0072] In some embodiments, Figure 3 As shown, the fluid suction structure 50 further includes a connecting member 53 , and the flow limiting member 52 is fixedly installed in the tube shell 51 at least through the connecting member 53 .

[0073] The number of the connecting members 53 may be one or more. For example, if the number of the connecting members 53 is three, the three connecting members 53 are arranged at intervals along the circumference of the tube shell 51, one end of the connecting member 53 is fixedly connected to the inner wall of the tube shell 51, and the other end of the connecting member 53 is fixedly connected to the flow limiting member 52, so that the flow limiting member 52 is stably installed in the tube shell 51.

[0074] In some embodiments, Figure 3 and Figure 4 As shown, the fluid suction structure 50 further includes a suction pipe 54. A first end of the suction pipe 54 is connected to the suction hole 514, and a second end of the suction pipe 54 is disposed at a position of the flow restricting member 52 close to the outlet end 513.

[0075] By setting the suction pipe 54, the fluid can be directly guided from the suction hole 514 to the low pressure or negative pressure area (such as the position of the flow limiter 52 near the outlet end 513) through the suction pipe 54. That is, by setting the suction pipe 54, a large pressure difference can be made between the two ends of the suction pipe 54. While the fluid is drawn from the suction hole 514 to the low pressure position of the flow limiter 52 near the outlet end 513, the setting of the suction pipeline can also prevent the fluid in the negative pressure flow channel 512 from flowing out in the opposite direction through the suction hole 514.

[0076] The portion of the suction pipe 54 close to the second end is disposed in the flow limiting member 52. That is, a channel structure is disposed inside the flow limiting member 52 as a part of the suction pipe 54, further simplifying the components.

[0077] Exemplarily, taking the case where the flow limiting member 52 is a spherical structure, a vertical channel structure is provided inside the flow limiting member 52 along two vertical radial lines to serve as the portion of the suction pipe 54 close to the second end.

[0078] Alternatively, the suction pipe 54 may also be configured as a physical pipeline. In this case, the second end of the suction pipe 54 may be extended along the side wall of the flow restricting member 52 until the flow restricting member 52 is close to the low pressure position of the outlet end 513 .

[0079] In some embodiments, Figure 3 As shown, in the case where the fluid suction structure 50 includes a connecting piece 53 , the suction conduit 54 is disposed in one of the connecting pieces 53 near the first end portion.

[0080] For example, the flow limiting member 52 is fixedly connected to the inner wall of the tube shell 51 through three connecting members 53 spaced 120 degrees apart from each other. At least one connecting member 53 is a hollow structure, aligned and connected with the suction hole 514, and one end of the connecting member 53 close to the flow limiting member 52 is aligned with the channel structure in the flow limiting member 52, that is, the connecting member 53 and the channel structure inside the flow limiting member 52 form a complete suction pipeline 54.

[0081] The second end of the suction pipe 54 is provided with an opening structure for flowing out cold end water and other fluids.

[0082] Through the above arrangement, at least a portion of the suction pipe 54 can be arranged in the connecting member 53, and on this basis, another portion of the suction pipe 54 can be arranged in the flow limiting member 52. The combination of the two further simplifies the number of components and simplifies the structure.

[0083] It should be noted that in the embodiment of the present application, if the suction pipe 54 is a physical pipeline, the number of the suction pipes can be set to one or more, and the flow limiting member 52 can be fixedly connected to the inner wall of the tube shell 51 through the first end of the suction pipe 54.

[0084] For the fluid suction structure 50, in the negative pressure flow channel 512 including the first flow channel 5121 and the second flow channel 5122 in the tube shell 51, when the fluid flowing from the inlet end 511 to the outlet end 513 flows through the flow limiting member 52, according to the Bernoulli principle, due to the reduction of the flow cross-sectional area, the flow velocity will increase and the fluid pressure will decrease. The fluid flow velocity in the throat is the largest. When the fluid continues to move downstream at a high speed across the throat, flow separation occurs on the surface of the sphere, so a low pressure area or even a negative pressure area is generated near the center of the downstream of the sphere, thereby generating an adsorption effect. This adsorption effect will cause the cold end water collected in the water storage tank 20 to flow back to the cold water pipeline 40 through the suction pipe 54, the suction hole 514 and the drain port 22, thereby avoiding the waste of water resources.

[0085] Define the measured fluid as an incompressible ideal inviscid fluid (liquid). According to the Bernoulli equation, Figure 5 The fluid inside the tube shell 51 at the cross sections II and II-II shown has the following energy relationship:

[0086]

[0087] Among them, u 1 ,u 2 They are Figure 5 The average flow velocity at the middle cross section I-I and II-II (throat) can be measured by using common measurement methods (such as the Doppler ultrasonic flowmeter propagation velocity difference method or the Pitot tube dynamic pressure method or the mass flow method). 1 ,p 2 They are the static pressure at cross sections I-I and II-II, respectively, which can be measured by a static pressure tube. 1 ,A 2 are the flow cross-sectional areas at cross sections I-I and II-II respectively. ρ represents the density of the inviscid fluid, and g represents the acceleration due to gravity. From this we can know:

[0088]

[0089] A 1 u 1 = 2 u 2 .

[0090] For an ideal inviscid fluid, the throat velocity is:

[0091]

[0092] The throat pressure is:

[0093]

[0094] If fluid viscosity is taken into account, the pressure loss needs to be subtracted:

[0095]

[0096] That is, the throat pressure with fluid viscosity is:

[0097]

[0098] K generally takes a minimum value. For example, in a venturi tube structure, when the ratio of the length to the throat diameter is 20, K takes 0.04. In the embodiment of the present application, taking the flow limiter 52 as a spherical structure as an example, the throat width is the difference between the inner diameter of the tube shell 51 and the diameter of the flow limiter 52.

[0099] The fluid flow rate u of the fluid pumping structure 50 at the throat 2 and the fluid flow rate u passing through the inlet end 511 1 With the flow cross-sectional area A 1 and A 2 Closely related. High flow rate 2 A strong flow separation will be generated downstream of the flow limiting member 52, which is very beneficial to generate a low-pressure area or even a negative pressure area at the exact center position downstream of the flow limiting member 52. Through the guidance of the suction pipe 54, the cold end water collected in the water storage tank 20 is prompted to flow back to the cold water pipeline 40.

[0100] In order to measure the pressure p of the low pressure area or even the negative pressure area generated at the center position downstream of the flow restriction member 52 2 .like Figure 6 As shown, the present application provides a test platform for the measurement principle of a fluid suction structure, which consists of a self-circulating water supply device 01, a test bench 02, a pumping motor speed regulator 03, an overflow plate 04, a water stabilizing orifice plate 05, a constant pressure water tank 06, a test pipeline 07, a pressure measuring gauge 08, a pressure measuring tube 09 (including ① pressure measuring tube, ② pressure measuring tube and ③ pressure measuring tube), a pressure measuring point 010 (including ① pressure measuring point, ② pressure measuring point and ③ pressure measuring point), a test flow regulating valve 011, a return funnel 012, etc. The ① pressure measuring point of this instrument (such as Figure 4 and Figure 5 The inlet end 511 shown), ② pressure measuring point (such as Figure 4 and Figure 5 The suction hole 514 and the center section of the flow limiting member 52) and ③ the pressure measuring point (such as Figure 4 and Figure 5 The outlet port 513 shown in the figure is connected to the ① pressure measuring tube, ② pressure measuring tube and ③ pressure measuring tube in sequence. The corresponding measured pressure is p 1 、p 2 and p 3 .

[0101] by Figure 6 The central pipe axis AA is used as the reference, the water level of the constant pressure water tank 06 is 37.20 cm, the test pipe 07 is a standard four-point pipe (with an outer diameter of 20 mm and an inner diameter of 15.4 mm), and the flow limiting member 52 (such as Figure 4 The diameter of A is 12 mm. 2 / 1=0.29, thereby ensuring that the throat has a smaller flow cross-sectional area, thereby increasing the flow rate. When the fluid continues to flow downstream at a high speed across the throat, flow separation occurs on the surface of the flow limiter 52 of the spherical structure, so a low-pressure area or even a negative pressure area is generated at the center position downstream of the flow limiter 52 (corresponding to the axis of the tube shell 51). In the test, the valve (i.e., the test flow control valve 011) opening is increased to approach the maximum flow rate of cold water (0.1025L / s). After stabilization, the water levels of each measuring pipe are as follows: Figure 6 shown.

[0102] From the test results, we can know that: 1 =3573Pa, p 2 =-3573Pa, p 3 =3475Pa. Therefore, a strong negative pressure area is generated in the annular cavity, and the pressure is: p 2 =-3573Pa, which is very beneficial for sucking the cold end water in the water storage tank 20 into the cold water pipeline 40.

[0103] In some embodiments, Figure 1 and Figure 2 As shown, the cold end water recovery system 100 of the hot water pipe further includes at least one of a first one-way valve 34 , a second one-way valve 35 and a third one-way valve 36 .

[0104] The first one-way valve 34 is connected between the drain port 22 and the suction hole 514. By installing the first one-way valve 34 between the drain port 22 and the suction hole 514, the cold end water and other fluids can flow out from the drain port 22 through the suction hole 514, the second flow channel 5122 and the cold water pipeline 40. It can be used for flushing and can also be used to adjust the water temperature with the hot water in the hot water pipeline 10. The setting of the first one-way valve 34 can prevent the liquid from flowing into the water storage tank 20 through the drain port 22 in the reverse direction from the suction hole 514.

[0105] It should be noted that when the liquid in the cold water pipeline 40 does not flow, no negative pressure area or low pressure area is formed downstream of the flow limiting member 52, and a higher static pressure is present. The first one-way valve 34 can prevent the liquid in the cold water pipeline 40 from continuously flowing into the water storage tank 20.

[0106] The third one-way valve 36 is connected between the water inlet 21 and the first valve 31. By setting the third one-way valve 36, the cold end water in the water storage tank 20 can be further prevented from flowing back into the hot water pipeline 10 to affect the water temperature.

[0107] Combination Figure 1 and Figure 2 The water tank 20 is also provided with a pressure equalizing hole 23, and a second one-way valve 35 is connected to the pressure equalizing hole 23 to prevent leakage of liquid inside the water tank 20. Air can flow in both directions at the second one-way valve 35.

[0108] That is, by setting the second one-way valve 35, air can enter the water tank 20 through the second one-way valve 35 and the pressure equalizing hole 23, and the air in the water tank 20 can also be discharged through the pressure equalizing hole 23 and the second one-way valve 35, so that the internal pressure of the water tank 20 is approximately consistent with the atmospheric pressure. However, for the cold end water of the liquid, the setting of the second one-way valve 35 can prevent the cold end water from being discharged from the water tank 20 through the pressure equalizing hole 23 and the second one-way valve 35, thereby avoiding the waste of water resources.

[0109] In some embodiments, Figure 1 and Figure 2 As shown, the cold end water recovery system 100 of the hot water pipeline also includes a mixing valve 70. One end inlet of the mixing valve 70 is connected to the water outlet 12 of the hot water pipeline 10, and the other end inlet of the mixing valve 70 is connected to the downstream of the outlet 513 in the cold water pipeline.

[0110] By setting the water mixing valve 70, the ratio of hot water to cold water can be flexibly adjusted, so that the user can flexibly adjust the water temperature as needed.

[0111] The water mixing valve 70 may be a faucet structure, which is applied to a wash basin or a vegetable washing basin. Alternatively, the water mixing valve 70 may be a bathing valve structure, which is convenient for users to take a bath or wash their mouths.

[0112] In addition, a single-way faucet can be installed at the water outlet 12 of the hot water pipe 10. A single-way faucet can also be installed downstream of the outlet 513 of the cold water pipe 40, both of which can realize the collection and reuse of cold end water, which is not limited to this.

[0113] In some embodiments, Figure 1 and Figure 2 As shown, the cold end water recovery system 100 of the hot water pipeline further includes a temperature sensor 33. In the hot water pipeline 10, the temperature sensor 33 is arranged near the connection between the first valve 31 and the hot water pipeline 10, and is used to detect the water temperature and output a water temperature parameter signal.

[0114] By setting a temperature sensor 33 at a position near the water outlet 12 of the hot water pipeline 10, it is convenient for the user to obtain the water temperature parameters near the water outlet 12. In this way, when the water temperature is greater than or equal to the preset temperature (such as 35°C or 40°C), the user can directly open the water outlet 12 through the faucet or the mixing valve 70 to take hot water, and the first valve 31 is in the second position state of closing. When the water temperature is lower than the preset temperature, the user opens the first valve 31 (the first valve 31 is in the second position state of opening) to allow the cold end water in the hot water pipeline 10 to flow to the water storage tank 20 until the water temperature is greater than or equal to the preset temperature, and then closes the first valve 31, and opens the water outlet 12 through the faucet or the mixing valve 70 to take hot water.

[0115] The first valve 31 may be a common valve, that is, the user may manually control the opening or closing of the first valve 31 to collect cold-end water.

[0116] Alternatively, the first valve 31 may be set as an electrically controlled valve, that is, the user may control the opening or closing of the first valve 31 through an electrical signal.

[0117] In some embodiments, the first valve 31 can be configured as a two-position three-way valve, that is, the first end of the first valve 31 is connected to the water inlet 21 of the water storage tank 20. The second end of the first valve 31 is connected to the water outlet 12. A temperature sensor 33 can be arranged upstream of the end and close to the end. And the third end of the first valve 31 is used for drainage.

[0118] Thus, when the first valve 31 is in the first position, the water inlet 21 is connected to the hot water pipeline 10 and the water outlet 12 is closed, so that the cold water in the hot water pipeline 10 flows into the water storage tank 20. When the first valve is in the second position, the water inlet 21 is closed to the hot water pipeline 10, and the water outlet 12 is opened. At this time, the hot water pipeline 10 can be opened through the faucet or the mixing valve 70 to take hot water.

[0119] In some embodiments, Figure 2 As shown, the cold end water recovery system 100 of the hot water pipeline also includes a second valve 32. The second valve 32 is not a valve structure of a mixing valve 70 or a faucet. The second valve 32 is connected to the water outlet 12. In the hot water pipeline 10, the connection between the first valve 31 and the hot water pipeline 10 is located upstream of the second valve 32.

[0120] The second valve 32 also has a first position state and a second position state. When the second valve 32 is in the first position state, the second valve 32 is in a closed state to cooperate with the first valve 31 in the first position state to close the water outlet 12. When the second valve 32 is in the second position state, the second valve 32 is in an open state to cooperate with the first valve 31 in the second position state to open the water outlet 12.

[0121] In some embodiments, Figure 2 As shown, the cold end water recovery system 100 of the hot water pipe further includes a third valve 37. In the cold water pipeline 40, the third valve 37 is installed downstream of the outlet end 513. In the case where a mixing valve 70 or a faucet is connected to the end of the cold water pipeline 40, the third valve 37 is connected between the outlet end 513 and the mixing valve 70 (or the faucet).

[0122] The third valve 37 also has a first position state and a second position state. When the third valve is in the first position state, the third valve 37 is in a closed state to cooperate with the first valve 31 in the first position state to prevent the cold water pipeline 40 from discharging water. When the third valve 37 is in the second position state, the third valve 37 is in an open state to cooperate with the first valve 31 in the second position state to simultaneously open the cold water pipeline 40, that is, the user can choose to open the position of the mixing valve 70 corresponding to the cold water pipeline 40, so as to mix hot water to adjust the water temperature, and simultaneously consume the collected cold end water in the water storage tank 20.

[0123] It should be noted that, when the first valve 31 is a two-position three-way valve, it can be selected whether to install the third valve 37 in the cold water pipeline 40 according to actual needs. In this case, there is no need to install the second valve 32 additionally.

[0124] When the first valve 31 is a two-position two-way valve, it can be selected whether to install the corresponding second valve 32 in the hot water pipeline 10 according to actual needs, and it can be selected whether to install the corresponding third valve 37 in the cold water pipeline 40 according to actual needs.

[0125] In some embodiments, Figure 7 As shown, the cold end water recovery system 100 of the hot water pipe further includes a controller 80, and the controller 80 is electrically connected to at least the first valve 31. The controller 80 may also be electrically connected to the temperature sensor 33. In the case where the cold end water recovery system 100 of the hot water pipe further includes any one of the second valve 32 and the third valve 37, the controller 80 may also be electrically connected to the corresponding second valve 32 and the third valve 37.

[0126] The controller 80 is configured to have a reflux state and a water outlet state, and the controller 80 switches the reflux state and the water outlet state according to a water temperature parameter signal or a time signal.

[0127] When the controller 80 is in the reflux state, the controller 80 controls the water inlet 21 of the water storage tank 20 and the hot water pipeline 10 to be connected, and the water outlet 12 of the hot water pipeline 10 is in a closed state, so that the cold end water in the hot water pipeline 10 flows into the water storage tank 20, so as to prevent the cold end water in the hot water pipeline 10 from being lost and wasted.

[0128] When the controller 80 is in the water outlet state, the controller 80 controls the water inlet 21 of the closed water tank 20, and the water outlet end 12 of the hot water pipe 10 is in an open state, so that the user can access hot water through the open water outlet end 12 for washing, bathing or cleaning items.

[0129] In some embodiments, the cold end water recovery system 100 of the hot water pipeline is used as an example in which only the first valve 31 is installed in the hot water pipeline 10. The first valve 31 is an electrically controlled valve and is electrically connected to the controller 80. At this time, the water outlet 12 of the hot water pipeline 10 and the cold water pipeline 40 may be connected to a mixing valve 70, or each may be connected to a faucet.

[0130] At this time, the first valve 31 is closed by default (i.e., the second position), and the controller 80 is in the water outlet state by default. When the user uses the hot water pipe 10 to take hot water, the user can use the temperature sensor 33 to check whether the water temperature parameter of the hot water pipe 10 near the water outlet 12 is greater than or equal to the preset temperature.

[0131] If so, the user can directly operate the water mixing valve 70 or the faucet to obtain hot water for use.

[0132] Otherwise, the user switches to the reflux state by operating the controller 80 so that the first valve 31 is in the open state (i.e., the first position state), and the cold end water in the hot water pipeline 10 is collected into the water storage tank 20 through the water inlet 21. After a preset time, or when the controller 80 receives the water temperature parameter signal of the temperature sensor 33 until the water temperature is greater than or equal to the preset temperature, the controller 80 can automatically switch to the water outlet state. The user can also manually operate the controller 80 to switch to the water outlet state after a preset time or when a preset temperature is reached. The user can then operate the mixing valve 70 or the faucet to access hot water for use.

[0133] In some embodiments, it is taken as an example that the first valve 31 at the hot water pipeline 10 is a two-position three-way electrically controlled valve, and the third valve 37 is an electrically controlled valve, and both are electrically connected to the controller 80 .

[0134] The controller 80 is in the water outlet state by default, and controls the first valve 31 to be in the second position state by default to open the water outlet 12 and close the water inlet 21, and the controller 80 controls the third valve 37 to be in the open state (i.e., the second position state). When the user uses the hot water pipe 10 to take hot water, the user can check whether the water temperature parameter of the hot water pipe 10 near the water outlet 12 is greater than or equal to the preset temperature through the temperature sensor 33.

[0135] If so, the user can directly operate the water mixing valve 70 to access hot water, cold water, and mixed temperature-adjusted water of cold water and hot water for use.

[0136] Otherwise, the user switches to the reflux state by operating the controller 80 so that the first valve 31 is in the first position state. At this time, the cold end water in the hot water pipeline 10 is collected into the water storage tank 20 through the water inlet 21, and the water outlet 12 is closed, and the controller 80 controls the third valve 37 to be in the closed state (i.e., the first position state). After a preset time, or when the controller 80 receives the water temperature parameter signal of the temperature sensor 33 until the water temperature is greater than or equal to the preset temperature, the controller 80 can automatically switch to the water outlet state. The user can also manually operate the controller 80 to switch to the water outlet state after a preset time or when a preset temperature is reached. The user can then operate the mixing valve 70 to access hot water, cold water, and a mixture of cold water and hot water for use.

[0137] In some embodiments, a first valve 31 and a second valve 32 are installed at the hot water pipeline 10, and a third valve 37 is installed at the cold water pipeline 40. The first valve 31, the second valve 32 and the third valve 37 are all electrically controlled valves and are electrically connected to the controller 80.

[0138] The controller 80 is in the water outlet state by default, and controls the first valve 31 to be in the second position state by default to close the water inlet 21, the controller 80 controls the second valve 32 to be in the open state (i.e., the second position state), and the controller 80 controls the third valve 37 to be in the open state (i.e., the second position state). When the user uses the hot water pipe 10 to take hot water, the user can check whether the water temperature parameter of the hot water pipe 10 near the water outlet 12 is greater than or equal to the preset temperature through the temperature sensor 33.

[0139] If so, the user can directly operate the water mixing valve 70 to access hot water, cold water, and mixed temperature-adjusted water of cold water and hot water for use.

[0140] Otherwise, the user switches to the reflux state by operating the controller 80 so that the first valve 31 is in the first position state so that the water inlet 21 is connected to the hot water pipeline 10. At this time, the cold end water in the hot water pipeline 10 is collected into the water storage tank 20 through the water inlet 21. The controller 80 in the reflux state controls the second valve 32 to be in a closed state to close the water outlet 12, and the controller 80 controls the third valve 37 to be in a closed state (i.e., the first position state). After a preset time, or when the controller 80 receives the water temperature parameter signal of the temperature sensor 33 until the water temperature is greater than or equal to the preset temperature, the controller 80 can automatically switch to the water outlet state. The user can also manually operate the controller 80 to switch to the water outlet state after a preset time or when a preset temperature is reached. The user can then operate the mixing valve 70 to access hot water, cold water, and a mixture of cold water and hot water for use.

[0141] Take the cold end water recovery system 100 of the hot water pipe automatically switching the reflux state and the water outlet state through the controller 80 to control the first position state and the second position state of the first valve 31, the second valve 32 and the third valve 37 as an example. The controller 80 can be configured as a time control switch or a temperature switch, such as a time control relay and a temperature relay.

[0142] Taking the controller 80 as a temperature switch as an example, the initial state of the controller 80 is the water outlet state, and the first valve 31, the second valve 32 and the third valve 37 are configured to be in the second position state in the initial state.

[0143] The controller 80 is in an off state by default. When the user starts the controller 80, the controller 80 receives the water temperature parameter signal and compares it with the preset temperature.

[0144] If the value of the water temperature parameter signal is greater than or equal to the preset temperature, that is, there is hot water at the water outlet 12 of the hot water pipe 10, the controller 80 is configured to maintain the water outlet state, so that the first valve 31, the second valve 32 and the third valve 37 are configured to maintain the second position state. The user can directly operate the mixing valve 70 to receive hot water, cold water, and mixed temperature-adjusted water of cold water and hot water for use.

[0145] If the value of the received water temperature parameter signal is less than the preset temperature after the controller 80 is started, that is, there is cold water at the water outlet 12 of the hot water pipeline 10. Then the controller 80 is configured to switch to the reflux state, so that the first valve 31, the second valve 32 and the third valve 37 are configured to switch to the first position state. At this time, the cold water in the hot water pipeline 10 is collected in the water storage tank 20, and no water will be discharged from the mixing valve 70 to avoid waste of water resources. The controller 80 continues to receive and compare the water temperature parameter signal until the value of the water temperature parameter signal is greater than or equal to the preset temperature, at which time the controller 80 switches to the water outlet state and closes. And the user can operate the mixing valve 70 to receive hot water, cold water, and a mixture of cold water and hot water for use.

[0146] Taking the controller 80 as a time-controlled switch as an example, the initial state of the controller 80 is the reflux state, and the first valve 31 , the second valve 32 and the third valve 37 are configured to be in the second position state in the initial state.

[0147] The controller 80 is turned off by default. When the user starts the controller 80, the controller 80 directly enters the reflux state and maintains a preset time, such as 5-20s (the preset time can be 5s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s, 17s, 18s, 19s or 20s), which can be adjusted according to the length of the hot water pipeline 10 and the power of the water heater 60. After the preset time, the controller switches to the water outlet state, and the water temperature at the water outlet end 12 of the hot water pipeline 10 is greater than or equal to the preset temperature. The user can operate the mixing valve 70 to receive hot water, cold water, and mixed temperature-adjusted water of cold water and hot water for use.

[0148] In some embodiments, the switch of the water mixing valve 70 and the controller 80 can be set to a linkage state, that is, the switch part of the water mixing valve 70 is directly connected to the start part of the controller 80 through a position sensor, a touch sensor, or so that the controller 80 is automatically started after the water mixing valve 70 is opened.

[0149] At this time, if there is cold end water in the hot water pipe 10, it will take some time for the hot water in the hot water pipe 10 to flow out through the water outlet 12 and the mixing valve 70 in sequence. This is equivalent to delaying the water outlet for a period of time, but the hot water flowing out of the hot water pipe 10 is hot water, thereby avoiding the loss and waste of cold end water.

[0150] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A fluid suction structure, characterized in that: include: The tube shell (51) is provided with an inlet end (511), a negative pressure flow channel (512) and an outlet end (513) which are connected in sequence; and a flow limiting member (52), which is arranged in the tube shell (51) and divides the negative pressure flow channel (512) into a first flow channel (5121) and a second flow channel (5122), wherein the first flow channel (5121) is located on a side of the flow limiting member (52) close to the inlet end (511), and the second flow channel (5122) is located on a side of the flow limiting member (52) close to the outlet end (513); an inner wall of the tube shell (51) and the flow limiting member (52) are arranged at a distance to conduct the first flow channel (5121) and the second flow channel (5122); Wherein, a suction hole (514) communicating with the second flow channel (5122) is provided at a side wall of the tube shell (51) close to the flow limiting component (52); A suction pipe (54), wherein a first end of the suction pipe (54) is connected to the suction hole (514); The second end of the suction pipe (54) is arranged at a position of the flow limiting member (52) close to the outlet end (513).

2. The fluid suction structure according to claim 1, characterized in that: The flow limiting member (52) is a spherical structure, an ellipsoidal structure or a conical structure.

3. The fluid suction structure according to claim 1, characterized in that: The portion of the suction pipe (54) close to the second end is arranged in the flow limiting member (52).

4. The fluid suction structure according to claim 1, characterized in that: The fluid pumping structure further comprises: A connecting piece (53), the flow limiting piece (52) is fixedly installed in the tube shell (51) through the connecting piece (53), and a portion of the suction pipe (54) close to the first end is arranged in one of the connecting pieces (53).

5. A cold end water recovery system for a hot water pipe, characterized in that: include: A hot water pipeline (10) having a water inlet end (11) and a water outlet end (12); A water storage tank (20) having a water inlet (21) and a water outlet (22); A first valve (31), wherein the water inlet (21) is connected to the hot water pipeline (10) near the water outlet (12) through the first valve (31); Cold water pipeline (40); And the fluid suction structure according to any one of claims 1 to 4, wherein the inlet end (511) and the outlet end (513) are connected between the cold water pipeline (40), and the drain outlet (22) is connected to the suction hole (514).

6. The cold end water recovery system of the hot water pipe according to claim 5, characterized in that: The first valve (31) is a two-position three-way valve structure, the first end of the first valve (31) is connected to the water inlet (21) of the water storage tank (20), the second end of the first valve (31) is connected to the water outlet (12), and the third end of the first valve (31) is used for water discharge; And / or, the cold end water recovery system of the hot water pipeline further comprises a third valve (37), and in the cold water pipeline (40), the third valve (37) is installed downstream of the outlet end (513); Alternatively, the cold end water recovery system of the hot water pipeline further comprises a second valve (32), wherein the second valve (32) is connected to the water outlet (12); in the hot water pipeline (10), the connection point between the first valve (31) and the hot water pipeline (10) is located upstream of the second valve (32).

7. The cold end water recovery system of the hot water pipe according to claim 5, characterized in that: The cold end water recovery system of the hot water pipeline also includes: a water mixing valve (70), wherein an inlet at one end of the water mixing valve (70) is connected to the water outlet (12), and in the cold water pipeline (40), an inlet at the other end of the water mixing valve (70) is connected to a position downstream of the outlet (513); And / or, a temperature sensor (33), in the hot water pipeline (10), the temperature sensor (33) is arranged near the connection point between the first valve (31) and the hot water pipeline (10), and is used to detect the water temperature and output a water temperature parameter signal.

8. The cold end water recovery system of the hot water pipe according to claim 5, characterized in that: The cold end water recovery system of the hot water pipeline also includes: a controller (80), the controller (80) being electrically connected to at least the first valve (31), the controller (80) being configured to have a reflux state and a water outlet state, and the controller (80) switches between the reflux state and the water outlet state according to a water temperature parameter signal or a time signal; When the controller (80) is in a reflux state, the controller (80) controls the water inlet (21) of the water storage tank (20) and the hot water pipeline (10) to be connected, and the water outlet (12) is in a closed state; When the controller (80) is in a water outlet state, the controller (80) controls the water inlet (21) of the water storage tank (20) to be closed, and the water outlet end (12) is in an open state.

9. The cold end water recovery system of the hot water pipe according to claim 5, characterized in that: The cold end water recovery system of the hot water pipeline also includes: a first one-way valve (34), the first one-way valve (34) being connected between the drain port (22) and the suction hole (514); and / or, a second one-way valve (35), the water storage tank (20) is further provided with a pressure equalizing hole (23), the second one-way valve (35) is connected to the pressure equalizing hole (23) to prevent leakage of liquid inside the water storage tank (20); and / or, a third one-way valve (36), wherein the third one-way valve (36) is connected between the water inlet (21) and the first valve (31).

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