Cold end water recovery system of hot water pipeline

Abstract

The utility model relates to the technical field of water heating bathroom accessories, discloses a cold end water recovery system of a hot water pipeline, and aims to solve the problem of high energy consumption of cold end water in a water heating bathroom accessory product in a recycling process. The cold end water recovery system of the hot water pipeline comprises the hot water pipeline, a water storage tank, a first valve, a cold water pipeline, a temperature sensor and a Venturi tube water absorber. The hot water pipeline is provided with a water inlet end and a water outlet end, and the water storage tank is provided with a water inlet and a water outlet. The water inlet is connected with the hot water pipeline close to the water outlet end through a first valve. The temperature sensor is arranged close to the water outlet end and used for detecting the water temperature. The Venturi tube water suction device is provided with an inlet end, an outlet end and a suction hole, the inlet end and the outlet end are sequentially connected between the cold water pipelines, and the drainage port is connected with the suction hole and used for sucking fluid in the water storage tank into the cold water pipelines. Due to the arrangement of the Venturi tube water absorber, extra power (such as electricity and a motor) is not needed for driving, and energy consumption is negligible.

Description

Technical Field

[0001] The utility model relates to the technical field of water heating and sanitary ware, in particular to 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 allow the cold-end water stored in the water tank to flow back 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. Utility Model Content

[0005] In view of this, the utility model provides a cold end water recovery system for a hot water pipe, aiming to solve the problem of high energy consumption during the recycling process of cold end water in plumbing and sanitary ware products.

[0006] The utility model provides a cold-end water recovery system for a hot water pipe, comprising a hot water pipe, a water storage tank, a first valve, a cold water pipe, a temperature sensor and a venturi tube water absorber. The hot water pipe has a water inlet and a water outlet, and the water storage tank has a water inlet and a water outlet. The water inlet is connected to the hot water pipe near the water outlet through the first valve. The temperature sensor is arranged near the water outlet and is used to detect the water temperature. The venturi tube water absorber has an inlet, an outlet and a suction hole, the inlet and the outlet are connected in sequence between the cold water pipe, and the water outlet is connected to the suction hole to suck the fluid in the water storage tank into the cold water pipe.

[0007] 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 first 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.

[0008] 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 will be sucked into the cold water pipeline through the suction hole and the drain port through the setting of the venturi tube water aspirator while flowing through the inlet and outlet ends in sequence, so as 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 venturi tube water aspirator, which will neither cause the loss and waste of the cold end water nor consume extra energy for the return and reuse of the cold end water, and has low energy consumption.

[0009] In an optional embodiment, the cold end water recovery system of the hot water pipe also includes a second valve, which is connected to the water outlet; in the hot water pipeline, the connection between the first valve and the hot water pipeline is located upstream of the second valve.

[0010] Beneficial effect: By controlling the first valve and the second valve, it is convenient to control the cold end water recovery system of the hot water pipe to flexibly adjust between the reflux state and the water outlet state.

[0011] 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 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.

[0012] Beneficial effect: Only one two-position three-way valve structure is needed to control the cold end water recovery system of the hot water pipe to flexibly switch between the reflux state and the water outlet state, and the structure is simple and effective.

[0013] In an optional embodiment, the cold end water recovery system of the hot water pipeline further comprises a mixing valve, one end inlet of the mixing valve is connected to the water outlet, and the other end inlet of the mixing valve is connected to a downstream position of the outlet in the cold water pipeline.

[0014] Beneficial effect: Through the setting of the mixing valve, the ratio of hot water and cold water can be flexibly adjusted, so that users can flexibly adjust the water temperature as needed.

[0015] In an optional embodiment, the cold end water recovery system of the hot water pipe further includes a third valve. In the cold water pipeline, the third valve is installed between the outlet end and the mixing valve.

[0016] Beneficial effect: By setting the third valve, hot water reaching a preset temperature in the cold water pipeline and the hot water pipeline can flow out synchronously, thus avoiding waste.

[0017] In an optional embodiment, the venturi tube water absorber includes a tube shell and a partition. The tube shell is provided with an inlet end, a negative pressure flow channel and an outlet end which are connected in sequence. The partition is arranged in the tube shell, and the negative pressure flow channel is divided into a first flow channel and a second flow channel, the first flow channel is located on a side of the partition close to the inlet end, and the second flow channel is located on a side of the partition close to the outlet end. The partition is provided with a jet hole, and the first flow channel is connected to the second flow channel through the jet hole. A suction hole connected to the second flow channel is provided at the side wall of the tube shell close to the partition.

[0018] Beneficial effect: By installing a partition with a jet hole in the tube shell, a suction structure (Venturi tube structure) that does not require electric drive can be formed, which has significant effects and a simple structure.

[0019] In an optional embodiment, the isolating member is a sheet-like structure, and the edge portion of the isolating member near the jet hole is protruded toward the second flow channel. Along the radial direction of the tube shell, the tube shell corresponding to the protruding portion of the isolating member is provided with a suction hole.

[0020] Beneficial effect: The corresponding arrangement of the protruding part and the suction hole allows the suction hole to have a higher negative pressure difference, making it easier to pump the cold end water in the water storage tank.

[0021] In an optional embodiment, the cold end water recovery system of the hot water pipeline further includes a controller. The controller is a time delay switch or a temperature switch, the controller is electrically connected to at least the first valve, and the controller is configured to have a reflux state and a water outlet state. When the controller is in the reflux state, the controller controls the water inlet of the water storage tank and the hot water pipeline to be connected, and the water outlet is in a closed state. When the controller is in the water outlet state, the controller controls the water inlet of the water storage tank to be closed, and the water outlet is in an open state.

[0022] 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.

[0023] 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.

[0024] In an optional embodiment, the cold end water recovery system of the hot water pipe further includes a first one-way valve, and the first one-way valve is connected between the drain outlet and the suction hole.

[0025] 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.

[0026] In an optional embodiment, the cold end water recovery system of the hot water pipe further includes a second one-way valve, the water storage tank is further 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. And / or, a third one-way valve, the third one-way valve is connected between the water inlet and the first valve.

[0027] Beneficial effect: 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 kept 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.

[0028] 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

[0029] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a structural schematic diagram of a cold end water recovery system of a hot water pipe according to an embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the connection structure of a cold water recovery system of a hot water pipeline in an embodiment of the utility model;

[0032] Figure 3 for Figure 1 A first cross-sectional view of the venturi water aspirator shown in;

[0033] Figure 4 for Figure 1 A second cross-sectional view of the venturi water aspirator shown in ;

[0034] Figure 5 for Figure 4A schematic diagram of a fluid trajectory inside the Venturi tube water aspirator shown in FIG.

[0035] Figure 6 A test platform for the determination principle of a venturi tube water absorber provided in an embodiment of the present application;

[0036] 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.

[0037] Description of reference numerals:

[0038] 100. Cold end water recovery system of hot water pipe;

[0039] 10. Hot water pipeline; 11. Water inlet; 12. Water outlet;

[0040] 20. Water storage tank; 21. Water inlet; 22. Drain outlet; 23. Pressure equalizing hole;

[0041] 31. First valve; 32. Second valve; 33. Temperature sensor; 34. First check valve; 35. Second check valve; 36. Third check valve; 37. Third valve;

[0042] 40. Cold water pipeline;

[0043] 50. Venturi tube water absorber; 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. isolation member; 53. jet hole;

[0044] 60. Water heater;

[0045] 70. Mixing valve;

[0046] 80. Controller;

[0047] 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

[0048] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0049] 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.

[0050] 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 utility model, unless otherwise specified, "plurality" means two or more.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Combine the following Figures 1 to 7 , describing a cold end water recovery system of a hot water pipe according to an embodiment of the utility model.

[0056] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a cold end water recovery system 100 for a hot water pipe, including a hot water pipeline 10, a water storage tank 20, a first valve 31, a cold water pipeline 40, a temperature sensor 33 and a venturi tube water absorber 50.

[0057] 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.

[0058] 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 .

[0059] 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 .

[0060] like Figure 3 As shown, the venturi tube water absorber has an inlet end 511, an outlet end 513 and a suction hole 514. Figure 1 and Figure 2The inlet end 511 and the outlet end 513 are connected to the cold water pipeline 40 in sequence, and the drain port 22 is connected to the suction hole 514 to suck the fluid in the water storage tank 20 into the cold water pipeline 40. The temperature sensor 33 is arranged near the water outlet end 12 and is used to detect the water temperature.

[0061] 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.

[0062] 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 will be sucked into the cold water pipeline 40 through the suction hole 514 and the drain port 22 while the cold water in the cold water pipeline 40 flows through the inlet end 511 and the outlet end 513 in sequence, so as 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 tank 20 into the cold water pipeline 40 through the venturi tube water sucker 50, so that the loss and waste of the cold end water will not be caused, and no extra energy needs to be consumed for the reflux and reuse of the cold end water, which has low energy consumption.

[0063] In the process of recycling the cold-end water in the hot water pipeline 10 to the water storage tank 20, the water temperature of the hot water pipeline 10 near the water outlet 12 can be detected and identified by the temperature sensor 33, so that the cold-end water with a lower temperature can be fully recycled into the water storage tank 20, and the hot water reaching the preset temperature can flow out from the water outlet 12. That is, by setting the temperature sensor 33, the outflow of the cold-end water can be effectively reduced and the hot water can flow out from the water outlet 12 in time.

[0064] It should be noted that in the embodiment of the present application, the venturi tube water absorber 50 can be applied to the cold end water recovery system 100 of the hot water pipe, and can also be used as an independent component in other required devices or scenarios, without limitation.

[0065] In some embodiments, Figure 3 and Figure 4As shown, the venturi tube water absorber 50 includes a tube shell 51 and an isolating member 52. 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. The isolating member 52 is arranged in the tube shell 51 and separates 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 isolating member 52 close to the inlet end 511, and the second flow channel 5122 is located on a side of the isolating member 52 close to the outlet end 513. The isolating member 52 is provided with a jet hole 53 so that the first flow channel 5121 and the second flow channel 5122 are connected through the jet hole 53. Among them, a suction hole 514 connected to the second flow channel 5122 is provided at the side wall of the tube shell 51 close to the isolating 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.

[0066] When the fluid flows through the inlet end 511, the first flow channel 5121, the jet hole 53, the second flow channel 5122 and the outlet end 513 of the venturi tube water absorber 50 in sequence, the fluid flows from the first flow channel 5121 to the second flow channel 5122 through the jet hole 53. Since the cross-sectional area of ​​the jet hole 53 provided on the isolation member 52 is reduced (i.e., the aperture of the jet hole 53 is smaller than the inner diameter of the tube shell 51), the flow velocity of the fluid increases after flowing through the jet hole 53. That is, the cold water flowing into the second flow channel 5122 at an accelerated speed will form a low pressure area or even a negative pressure area near the isolation member 52 in the second flow channel 5122, thereby sucking the cold end water in the water storage tank 20 into the cold water pipeline 40 equipped with the venturi tube water absorber 50 through the suction hole 514 and the drain port 22, so as to adjust the water temperature in coordination with the hot water in the hot water pipeline 10. In this process, the cold end water in the water tank 20 is sucked into the cold water pipeline 40 by the venturi tube water absorber 50 without the need for external force, which neither causes the loss and waste of cold end water nor consumes extra energy for the return and reuse of cold end water, and has low energy consumption.

[0067] In the above solution, by installing a partition 52 with a jet hole 53 in the tube shell 51, a suction structure that does not require electric drive can be formed, which has significant effects and a simple structure.

[0068] In some embodiments, Figure 3 and Figure 4 As shown, the isolating member 52 is a sheet-like structure, and the edge portion of the isolating member close to the jet hole 53 is protruded toward the second flow channel 5122. Along the radial direction of the tube shell 51, the protruding portion of the isolating member 52 is provided with a suction hole 514 corresponding to the tube shell 51.

[0069] The principle of low pressure generation by the venturi tube water absorber 50 is as follows:

[0070] When the incoming fluid in the pipeline enters the throat (i.e., the jet hole 53) from the inlet end 511 through the first flow channel 5121, according to Bernoulli's principle, the flow velocity increases and the fluid pressure decreases due to the reduction in the flow cross-sectional area. The flow cross-sectional area at the jet hole 53 is the smallest, and the corresponding fluid flow velocity is the largest. When the fluid continues to move downstream at a high speed across the jet hole 53, since the fluid suddenly enters the large pipe from the small pipe, due to the effect of fluid inertia, the fluid particles cannot immediately adhere to the inner wall surface of the tube shell 51 at the sudden expansion point, but at the outlet side section of the jet hole 53 (i.e. Figure 5 II-II in the figure) quickly leaves the jet hole 53, and generates friction with the fluid near the annular cavity (i.e., the annular cavity between the protruding part of the isolation piece 52 and the tube shell 51), so that the fluid in and near the annular cavity moves downstream under the action of this friction, thus forming a low pressure or even a negative pressure in the annular cavity, and a series of backflow vortices appear. Afterwards, as the fluid flows downstream, as the cross-sectional area continues to expand, until the fluid at the III-III section fills the entire pipe cross-section, the flow velocity decreases and the fluid pressure increases. It can be seen that a low pressure or even a negative pressure is formed in the annular cavity, thereby generating an adsorption effect. This adsorption effect will cause the cold end water in the water storage tank 20 to flow back to the cold water pipeline 40 through the suction hole 514 and the drain port 22.

[0071] Based on this, by setting a suction hole 514 at the tube shell 51 corresponding to the above-mentioned annular cavity, the venturi tube water absorber 50 can have a better suction effect on the cold end water in the water storage tank 20.

[0072] 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:

[0073]

[0074] Among them, u1 and u2 are Figure 5 The average flow velocity at the middle cross section I-I, II-II (throat) can be measured by common measurement methods (such as the Doppler ultrasonic flowmeter propagation velocity difference method or the Pitot tube dynamic pressure method or mass flow method). p1 and p2 are the static pressure at the cross section I-I and II-II, respectively, which can be measured by the static pressure tube. A1 and A2 are the flow cross-sectional areas at the cross section I-I and II-II, respectively. ρ represents the density of the inviscid fluid, and g represents the acceleration of gravity. It can be known from this:

[0075]

[0076] A1u1=A2u2.

[0077] For an ideal inviscid fluid, the throat velocity is:

[0078]

[0079] The fluid flow rate u2 at the throat of the venturi tube water absorber 50 and the fluid flow rate u1 at the inlet end 511 are closely related to the flow cross-sectional areas A1 and A2. The high flow rate u2 will produce a strong flow separation downstream of the isolation member 52, which is very conducive to generating a low pressure area or even a negative pressure area in the annular cavity, and the cold end water collected in the water storage tank 20 is forced to flow back to the cold water pipeline 40 through the suction hole 514 and the drainage port 22.

[0080] In order to measure the pressure p2 of the low pressure area or even the negative pressure area generated in the annular cavity, that is, Figure 5 The pressure of the annular cavity at position II-II. Figure 6 As shown, the present application provides a test platform for the measurement principle of a venturi tube water aspirator, 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 scale 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 water 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 axis) and ③ pressure measuring point (such as Figure 4 and Figure 5 The outlet port 513 shown is connected to ① pressure measuring tube, ② pressure measuring tube and ③ pressure measuring tube in sequence. The corresponding pressures measured are p1, p3 and p4.

[0081] 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 jet hole 53 (such as Figure 4 The inner diameter of the test pipe is 8mm. In the test, the valve (i.e., test flow control valve 011) is opened to a value close to the maximum flow rate of cold water (0.1025L / s). After stabilization, the water level of each test pipe is as follows: Figure 6 shown.

[0082] The test results show that: p1 = 2494 Pa, p3 = -2447 Pa, p4 = 2445 Pa. Therefore, a strong negative pressure area is generated in the annular cavity (pressures p2 and p3 are approximately equal), which is very conducive to sucking the cold end water in the water storage tank 20 into the cold water pipeline 40.

[0083] 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 .

[0084] 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.

[0085] 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 isolation member 52, and a higher static pressure is formed. 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Combined with the temperature sensor 33 disposed 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 .

[0094] Thus, 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 obtain hot water, and the first valve 31 is in the second closed position. 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 opened position) 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 obtain hot water.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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).

[0102] 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.

[0103] 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.

[0104] 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.

[0105] In some embodiments, Figure 7As shown, the cold end water recovery system 100 of the hot water pipe also includes a controller 80, which is a time delay switch or a temperature switch. The controller 80 is electrically connected to at least the first valve 31. The controller 80 can 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 also includes any one of the second valve 32 and the third valve 37, the controller 80 can also be electrically connected to the corresponding second valve 32 and the third valve 37.

[0106] 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.

[0107] 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 to prevent the cold end water in the hot water pipeline 10 from being lost and wasted.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] If so, the user can directly operate the water mixing valve 70 or the faucet to obtain hot water for use.

[0112] 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.

[0113] 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 .

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] Although the embodiments of the present invention are 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 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); A temperature sensor (33), the temperature sensor (33) being arranged close to the water outlet (12) and used for detecting water temperature; and a venturi tube water absorber (50), the venturi tube water absorber (50) having an inlet end (511), an outlet end (513) and a suction hole (514), the inlet end (511) and the outlet end (513) being connected to the cold water pipeline (40) in sequence, the drain port (22) being connected to the suction hole (514) and being used to absorb the fluid in the water storage tank (20) into the cold water pipeline (40); A second valve (32), 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).

2. The cold end water recovery system of the hot water pipe according to claim 1, characterized in that: The first valve (31) is a two-position three-way valve structure, wherein a first end of the first valve (31) is connected to the water inlet (21) of the water storage tank (20), a second end of the first valve (31) is connected to the water outlet (12), and a third end of the first valve (31) is used for water discharge.

3. The cold end water recovery system of the hot water pipe according to claim 1, 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).

4. The cold end water recovery system of the hot water pipe according to claim 3, characterized in that: The cold end water recovery system of the hot water pipeline also includes: A third valve (37), in the cold water pipeline (40), the third valve (37) is installed between the outlet end (513) and the mixing valve (70).

5. The cold end water recovery system of the hot water pipe according to any one of claims 1 to 4, characterized in that: The venturi tube water absorber (50) comprises: The tube shell (51) is provided with the inlet end (511), the negative pressure flow channel (512) and the outlet end (513) which are connected in sequence; and an isolating 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 isolating member (52) close to the inlet end (511), and the second flow channel (5122) is located on a side of the isolating member (52) close to the outlet end (513); the isolating member (52) is provided with a jet hole (53), and the first flow channel (5121) is connected to the second flow channel (5122) through the jet hole (53); The suction hole (514) communicating with the second flow channel (5122) is provided on the side wall of the tube shell (51) close to the isolation member (52).

6. The cold end water recovery system of the hot water pipe according to claim 5, characterized in that: The isolating member (52) is a sheet-like structure, and the edge portion of the isolating member (52) close to the jet hole (53) is protruding toward the second flow channel (5122); Along the radial direction of the tube shell (51), the suction hole (514) is provided at the tube shell (51) corresponding to the protruding portion of the isolation member (52).

7. The cold end water recovery system of the hot water pipe according to any one of claims 1 to 4, characterized in that: The cold end water recovery system of the hot water pipeline also includes: A controller (80), wherein the controller (80) is a time-delay switch or a temperature switch, the controller (80) is electrically connected to at least the first valve (31), and the controller (80) is configured to have a reflux state and a water outlet state; 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.

8. The cold end water recovery system of the hot water pipe according to any one of claims 1 to 4, characterized in that: The cold end water recovery system of the hot water pipeline also includes: A first one-way valve (34), wherein the first one-way valve (34) is connected between the drain port (22) and the suction hole (514).

9. The cold end water recovery system of the hot water pipe according to any one of claims 1 to 4, characterized in that: The cold end water recovery system of the hot water pipeline also includes: 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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