Pipeline anti-freezing system

Abstract

The utility model discloses a pipeline anti-freezing system. The pipeline anti-freezing system comprises a plurality of solar heat collection plates, a heat collection water tank, a heat storage water tank, a first water pump and a heat exchange device. And an outlet valve and an inlet valve are respectively arranged at an outlet and an inlet of each solar heat collection plate. The heat collection water tank is higher than the solar heat collection plate, and the heat collection water tank communicates with a water outlet of the solar heat collection plate through a first water inlet pipe and communicates with a water return opening of the solar heat collection plate through a first water return pipe. The heat storage water tank communicates with the heat collection water tank through a second water inlet pipe and a second water return pipe to form a water circulation loop. The first water pump is installed on the second water return pipe. A hot fluid inlet and a hot fluid outlet of the heat exchange device both communicate with the hot water storage tank, and a cold fluid inlet and a cold fluid outlet of the heat exchange device both communicate with a fire fighting pipeline. According to the pipeline anti-freezing system, the maintenance cost of a tunnel fire fighting system is greatly reduced, and self-circulation is achieved between the solar heat collection plate and the heat collection water tank through the density difference between hot water and cold water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water supply and drainage, in particular to a pipeline anti-freezing system. BACKGROUND

[0002] Highway tunnels are important traffic infrastructures, and their safety and reliability are of great importance. Fire-fighting pipeline systems are important components of emergency response systems in tunnels. Once a fire breaks out in a tunnel, the fire-fighting pipeline needs to quickly provide water for fire extinguishing to ensure personnel safety and reduce property losses. Therefore, ensuring that the fire-fighting pipeline can work normally under any conditions is a key link in tunnel maintenance and management. However, in some areas, the outdoor temperature is often below zero degrees in winter, and can even reach minus 20 to 30 degrees. Such extremely low-temperature environment can cause the water in the fire-fighting pipeline to freeze. The water will expand in volume during the freezing process, which will cause the pipeline to break or form ice blockage, so that the fire-fighting system cannot function at a critical moment.

[0003] At present, the fire-fighting pipeline is usually wrapped with thermal insulation materials to prevent the water in the fire-fighting pipeline from freezing. Although the thermal insulation materials can slow down the heat loss of the fire-fighting pipeline, their thermal insulation effect is limited under extremely cold conditions. To prevent the water in the fire-fighting pipeline from freezing under extremely cold conditions, electric heat tracing tapes have been applied to the fire-fighting pipeline for anti-freezing and thermal insulation in a large number of tunnels. The electric heat tracing tapes can effectively prevent the fire-fighting pipeline from freezing, and ensure that the fire-fighting system can be quickly started under extreme weather conditions. However, the electric heat tracing tapes wound on the fire-fighting pipeline need to consume a large amount of electric energy when working, resulting in high maintenance cost of the tunnel fire-fighting system. CONTENT OF THE UTILITY MODEL

[0004] The embodiment of the present application provides a pipeline anti-freezing system, which solves the technical problem that the electric heat tracing tapes wound on the fire-fighting pipeline need to consume a large amount of electric energy when working, resulting in high maintenance cost of the tunnel fire-fighting system in the prior art.

[0005] The pipeline anti-freezing system provided by the embodiment of the present application comprises: a plurality of solar heat collecting plates, an outlet valve and an inlet valve are arranged at the outlet and the inlet of each solar heat collecting plate respectively; a heat collecting water tank, the heat collecting water tank is higher than the plurality of solar heat collecting plates, and the heat collecting water tank is connected to water outlets of the plurality of solar heat collecting plates through a first water inlet pipe and connected to water return outlets of the plurality of solar heat collecting plates through a first water return pipe; a heat storage water tank, the heat storage water tank is connected to the heat collecting water tank through a second water inlet pipe and a second water return pipe, forming a water circulation loop; a first water pump, the first water pump is installed on the second water return pipe; and a heat exchange device, the heat fluid inlet and the heat fluid outlet of the heat exchange device are both connected to the heat storage water tank, and the cold fluid inlet and the cold fluid outlet of the heat exchange device are both connected to the fire-fighting pipeline.

[0006] In a possible implementation, the heat exchange device comprises a heat exchanger, a second water pump and a third water pump; a hot fluid inlet and a hot fluid outlet of the heat exchanger are communicated with the heat storage water tank through a first heat exchange pipeline and a second heat exchange pipeline respectively; a cold fluid inlet and a cold fluid outlet of the heat exchanger are communicated with the fire-fighting pipeline through a third heat exchange pipeline and a fourth heat exchange pipeline respectively; the second water pump is installed on the first heat exchange pipeline, and the third water pump is installed on the fourth heat exchange pipeline.

[0007] In a possible implementation, the heat exchange device further comprises an electric gate valve, which is installed on the fire-fighting pipeline and located between the third heat exchange pipeline and the fourth heat exchange pipeline.

[0008] In a possible implementation, the heat exchange device further comprises a first dirt removal tank, which is arranged on the third heat exchange pipeline.

[0009] In a possible implementation, the pipeline anti-freezing system further comprises a water source heat pump, two ends of a heat source side of the water source heat pump are communicated with the second water inlet pipeline through a first heat pump water inlet pipeline and a first heat pump water outlet pipeline respectively, and two ends of a use side of the water source heat pump are communicated with the second water return pipeline through a second heat pump water inlet pipeline and a second heat pump water outlet pipeline respectively; a fourth water pump is installed on the first heat pump water inlet pipeline.

[0010] In a possible implementation, the pipeline anti-freezing system further comprises a water supplement device, which is communicated with the heat collection water tank and the heat storage water tank.

[0011] In a possible implementation, the water supplement device comprises a first water supplement pipeline, a second water supplement pipeline and a liquid level float ball valve; one end of the first water supplement pipeline is communicated with the heat collection water tank, and the other end of the first water supplement pipeline is used for being communicated with a water supplement source; one end of the second water supplement pipeline is communicated with the heat storage water tank, and the other end of the second water supplement pipeline is used for being communicated with the water supplement source; the liquid level float ball valve is located in the interior of the heat collection water tank and is communicated with the first water supplement pipeline.

[0012] In a possible implementation, an end of the second water supplement pipeline relative to the heat storage water tank is connected to the first water supplement pipeline; the water supplement device further comprises a second dirt removal tank, a silicon phosphorus crystal tank and an electronic descaling instrument, which are arranged on the first water supplement pipeline and close to the water supplement source.

[0013] In a possible implementation, the pipeline anti-freezing system further comprises a water collection well, a first overflow pipeline and a second overflow pipeline; two ends of the first overflow pipeline are communicated with the heat collection water tank and the heat storage water tank respectively; two ends of the second overflow pipeline are communicated with the heat storage water tank and the water collection well respectively.

[0014] The technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0015] The pipeline anti-freezing system provided by the embodiments of the present application comprises a plurality of solar heat collecting plates, a heat collecting water tank, a heat storage water tank, a first water pump and a heat exchange device. The plurality of solar heat collecting plates can heat water by using solar energy. When the temperature of water in one of the solar heat collecting plates rises to a preset temperature, the outlet valve of the solar heat collecting plate is opened. Since the density of hot water is smaller, the hot water flows upwards from the solar heat collecting plate and enters the heat collecting water tank. The cold water in the heat collecting water tank flows downwards from the heat collecting water tank and enters the first return pipe. The water inlet valve of the solar heat collecting plate that has released hot water is opened, and the cold water enters the solar heat collecting plate to be heated. The density difference between the hot water and the cold water between the solar heat collecting plate and the heat collecting water tank enables the hot water and the cold water to flow autonomously, and the solar heat collecting plate and the heat collecting water tank realize self-circulation. Under the action of the first water pump, the hot water in the heat collecting water tank flows out and enters the heat storage water tank through the second water inlet pipe, and the cold water in the heat storage water tank flows out and enters the heat collecting water tank through the second return pipe. The hot water in the heat storage water tank flows into the heat exchange device from the hot fluid inlet of the heat exchange device and flows out of the heat exchange device from the hot fluid outlet, and the water in the fire-fighting pipeline flows into the heat exchange device from the cold fluid inlet of the heat exchange device and flows out of the heat exchange device from the cold fluid outlet, so that the heat exchange device uses the hot water in the heat storage water tank to heat the water in the fire-fighting pipeline, preventing the water in the fire-fighting pipeline from freezing under extremely cold conditions. The pipeline anti-freezing system uses solar energy to heat the water in the fire-fighting pipeline, and compared with using an electric heat tracing band to heat the fire-fighting pipeline, the pipeline anti-freezing system greatly reduces the consumption of electric energy and reduces the maintenance cost of the tunnel fire-fighting system. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structural schematic diagram of the pipeline anti-freezing system provided by the embodiments of the present application is shown in the figure.

[0018] Figure 2 The structural schematic diagram of the heat exchange device provided by the embodiments of the present application is shown in the figure.

[0019] 10 - solar collector plate, 12 - heat collection water tank, 14 - heat storage water tank, 16 - first water pump, 18 - heat exchange device, 20 - heat exchanger, 22 - second water pump, 24 - third water pump, 26 - electric gate valve, 28 - first dirt removal tank, 30 - water source heat pump, 32 - fourth water pump, 34 - water supplement device, 36 - first water supplement pipe, 38 - second water supplement pipe, 40 - liquid level float ball valve, 42 - second dirt removal tank, 44 - silicon phosphorus crystal tank, 46 - electronic descaling instrument, 48 - water collection well, 50 - first overflow pipe, 52 - second overflow pipe, 54 - first water inlet pipe, 56 - first water return pipe, 58 - second water inlet pipe, 60 - second water return pipe, 62 - fire fighting pipeline, 64 - first heat exchange pipeline, 66 - second heat exchange pipeline, 68 - third heat exchange pipeline, 70 - fourth heat exchange pipeline, 72 - first heat pump water inlet pipe, 74 - first heat pump water outlet pipe, 76 - second heat pump water inlet pipe, 78 - second heat pump water outlet pipe, 80 - high-level fire fighting pool, 82 - low-level fire fighting pool, 84 - water pump, 86 - submersible water pump. DETAILED DESCRIPTION

[0020] The fire fighting pipeline of a highway tunnel is crucial to safety and can quickly supply water for fire extinguishing in case of fire. However, in extremely cold regions, the pipeline is prone to freezing, thereby affecting the fire fighting function. At present, the main anti-freezing measures are thermal insulation materials and electric heat tracing tapes, but the thermal insulation effect of the thermal insulation materials is limited, and the electric heat tracing tapes have high energy consumption, thereby increasing the maintenance cost.

[0021] To solve the above technical problems, the embodiment of the present application provides a pipeline anti-freezing system. The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0023] The embodiments of the present application provide a pipeline anti-freezing system, as shown in Figure 1 and Figure 2 The pipeline anti-freezing system comprises a plurality of solar heat collecting plates 10, a heat collecting water tank 12, a heat storage water tank 14, a first water pump 16 and a heat exchange device 18.

[0024] The outlet and the inlet of each solar heat collecting plate 10 are respectively provided with an outlet valve and an inlet valve. The heat collecting water tank 12 is higher than the plurality of solar heat collecting plates 10, and the heat collecting water tank 12 is communicated with the water outlets of the plurality of solar heat collecting plates 10 through a first water inlet pipe 54, and is communicated with the water return ports of the plurality of solar heat collecting plates 10 through a first water return pipe 56.

[0025] When the plurality of solar heat collecting plates 10 are irradiated by sunlight, the plurality of solar heat collecting plates 10 absorb the heat of the sunlight to heat the water in the plurality of solar heat collecting plates 10, when the temperature of the water in one of the solar heat collecting plates 10 rises to a preset temperature, the outlet valve of the solar heat collecting plate 10 is opened, because the density of hot water is smaller, the hot water flows out of the solar heat collecting plate 10 and flows upward through the first water inlet pipe 54 and enters the heat collecting water tank 12; the cold water in the heat collecting water tank 12 flows out of the heat collecting water tank 12 and flows downward into the first water return pipe 56, the water inlet valve of the solar heat collecting plate 10 which has released hot water is opened, and the cold water enters the solar heat collecting plate 10 for heating. Therefore, the density difference between hot water and cold water is used between the solar heat collecting plate 10 and the heat collecting water tank 12 to realize the autonomous flow of hot water and cold water, and then a water pump or other power device is not needed to drive the flow of hot water and cold water, so that the solar heat collecting plate 10 and the heat collecting water tank 12 can realize self-circulation.

[0026] The outlet valve of the solar heat collecting plate 10 can be a manual valve, a solenoid valve, a self-operated temperature control valve, and the like. It should be noted that the self-operated temperature control valve can be in a closed state when the water temperature of the solar heat collecting plate 10 is lower than a preset temperature, and can be opened when the water temperature of the solar heat collecting plate 10 is higher than the preset temperature. The inlet valve of the solar heat collecting plate 10 can be a manual valve, a solenoid valve, and the like.

[0027] The heat storage water tank 14 is connected to the heat collecting water tank 12 through the second water inlet pipe 58 and the second water return pipe 60 to form a water circulation loop. The first water pump 16 is installed on the second water return pipe 60. The first water pump 16 is used to force the heat storage water tank 14 and the heat collecting water tank 12 to circulate cold and hot water through the second water inlet pipe 58 and the second water return pipe 60.

[0028] Exemplarily, when the water temperature of the heat collecting water tank 12 is greater than or equal to 45℃, and the water temperature of the heat storage water tank 14 is less than or equal to 42℃, the first water pump 16 is opened, and the heat storage water tank 14 and the heat collecting water tank 12 are forced to circulate cold and hot water, so that the water temperature of the heat storage water tank 14 is increased. When the water temperature of the heat collecting water tank 12 is less than 45℃, the first water pump 16 is closed, and the circulation of cold and hot water between the heat storage water tank 14 and the heat collecting water tank 12 is stopped.

[0029] The hot fluid inlet and the hot fluid outlet of the heat exchange device 18 are both connected to the heat storage water tank 14. The cold fluid inlet and the cold fluid outlet of the heat exchange device 18 are both connected to the fire-fighting pipeline 62. Specifically, the hot water in the heat storage water tank 14 flows into the heat exchange device 18 from the hot fluid inlet of the heat exchange device 18, and flows out of the heat exchange device 18 from the hot fluid outlet. The water in the fire-fighting pipeline 62 flows into the heat exchange device 18 from the cold fluid inlet of the heat exchange device 18, and flows out of the heat exchange device 18 from the cold fluid outlet. Thus, the heat exchange device 18 uses the hot water in the heat storage water tank 14 to heat the water in the fire-fighting pipeline 62, and the fire-fighting pipeline 62 is connected to the high-level fire water tank, thereby preventing the water in the fire-fighting pipeline 62 and the high-level fire water tank from freezing under extremely cold conditions.

[0030] The pipeline anti-freezing system provided by the embodiment of the present application uses solar energy to heat the water in the fire-fighting pipeline 62. Compared with using an electric heat tracing band to heat the fire-fighting pipeline 62, the pipeline anti-freezing system greatly reduces the consumption of electric energy and reduces the maintenance cost of the tunnel fire-fighting system.

[0031] It should be noted that, Figure 1The high fire water tank 80, the low fire water tank 82, the water pump 84, and the submersible water pump 86 are also shown. The submersible water pump 86 is installed in the water well and is connected to the low fire water tank 82 through a pipeline, and is used to pump water in the water well to the low fire water tank 82. The low fire water tank 82 and the high fire water tank 80 are connected through a pipeline, and the water pump 84 is installed on the pipeline, and is used to pump water in the low fire water tank 82 to the high fire water tank 80.

[0032] As shown in Figure 2 , the embodiment of the present application provides a specific structure of the heat exchange device 18. The heat exchange device 18 includes a heat exchanger 20, a second water pump 22, and a third water pump 24. The hot fluid inlet and the hot fluid outlet of the heat exchanger 20 are connected to the heat storage water tank 14 through the first heat exchange pipeline 64 and the second heat exchange pipeline 66, respectively. The cold fluid inlet and the cold fluid outlet of the heat exchanger 20 are connected to the fire pipeline 62 through the third heat exchange pipeline 68 and the fourth heat exchange pipeline 70, respectively. The second water pump 22 is installed on the first heat exchange pipeline 64, and the third water pump 24 is installed on the fourth heat exchange pipeline 70.

[0033] The fire pipeline 62 is connected to the high fire water tank, and the second water pump 22 and the third water pump 24 are used to exchange heat between the heat storage water tank 14 and the high fire water tank. Specifically, the second water pump 22 is used to deliver hot water in the heat storage water tank 14 to the heat exchanger 20 through the first heat exchange pipeline 64, and the third water pump 24 is used to deliver cold water in the high fire water tank to the heat exchanger 20 through the fire pipeline 62 and the third heat exchange pipeline 68. The hot water in the heat storage water tank 14 and the cold water in the high fire water tank exchange heat in the heat exchanger 20.

[0034] Further, continuing to refer to Figure 2 , the heat exchange device 18 also includes an electric gate valve 26, which is installed on the fire pipeline 62 and located between the third heat exchange pipeline 68 and the fourth heat exchange pipeline 70. The electric gate valve 26 is used to control whether the water in the fire pipeline 62 enters the heat exchanger 20 for heating.

[0035] For example, when the water temperature in the hot water storage tank 14 is greater than or equal to 45°C and the water temperature in the elevated water tank is less than 42°C, the electric gate valve 26 is closed and the second water pump 22 and the third water pump 24 are opened, so that the water in the hot water storage tank 14 and the elevated water tank begins to circulate; when the water temperature in the elevated water tank is greater than or equal to 42°C, the electric gate valve 26 is opened and the second water pump 22 and the third water pump 24 are closed, so that the water in the hot water storage tank 14 and the elevated water tank stops circulating; when the water temperature in the fire pipeline 62 is less than or equal to 5°C, the electric gate valve 26 is closed and the second water pump 22 and the third water pump 24 are opened, so that the water in the fire pipeline 62 and the water in the hot water storage tank 14 begin to circulate; when the water temperature in the fire pipeline 62 is greater than 10°C, the electric gate valve 26 is closed and the second water pump 22 and the third water pump 24 are opened, so that the water in the fire pipeline 62 is heated.

[0036] Further, the heat exchange device 18 also includes a first sludge removal tank 28, which is disposed in the third heat exchange pipe 68. The first sludge removal tank 28 can filter the water entering the third heat exchanger 20 from the fire pipe 62 to prevent impurities in the water from clogging the heat exchanger 20.

[0037] like Figure 1 As shown, the pipe antifreeze system provided in this application embodiment also includes a water source heat pump 30 and a fourth water pump 32; the two ends of the heat source side of the water source heat pump 30 are connected to the second inlet pipe 58 through the first heat pump inlet pipe 72 and the first heat pump outlet pipe 74, respectively; the two ends of the user side of the water source heat pump 30 are connected to the second return pipe 60 through the second heat pump inlet pipe 76 and the second heat pump outlet pipe 78, respectively; the fourth water pump 32 is installed on the first heat pump inlet pipe 72.

[0038] Specifically, a three-way valve is provided at the connection between the first heat pump inlet pipe 72 and the second inlet pipe 58; a three-way valve is provided at the connection between the second heat pump inlet pipe 76 and the second return pipe 60, and at the connection between the second heat pump outlet pipe 78 and the second return pipe 60.

[0039] When the water temperatures in both the collecting tank 12 and the storage tank 14 are low, and the water temperature in the collecting tank 12 is lower than that in the storage tank 14, the water source heat pump 30, the first water pump 16, and the fourth water pump 32 are activated. The three-way valve on the second inlet pipe 58 is adjusted, and the fourth water pump 32 causes water from the second inlet pipe 58 to flow into the water source heat pump 30 through the first heat pump inlet pipe 72. Water flowing out of the water source heat pump 30 then flows into the storage tank 14 through the first heat pump outlet pipe 74 and the second inlet pipe 58. Simultaneously, the three-way valve on the second return pipe 60 is adjusted, and the first water pump 16 causes water from the second return pipe 60 to flow into the water source heat pump 30 through the second heat pump inlet pipe 76. Water flowing out of the water source heat pump 30 then flows into the collecting tank 12 through the second heat pump outlet pipe 78 and the second return pipe 60. Through this process, the water source heat pump 30 upgrades the low-grade solar thermal energy to high-grade thermal energy, thereby raising the temperature of the storage tank 14.

[0040] For example, during the period from 10:00 to 15:00, the water temperatures of both the hot water collection tank 12 and the hot water storage tank 14 are less than 25°C, and the water temperature of the hot water collection tank 12 is less than the water temperature of the hot water storage tank 14. The water source heat pump 30, the first water pump 16 and the fourth water pump 32 are started, and the three-way valve on the second water inlet pipe 58 and the three-way valve on the second water return pipe 60 are adjusted according to the above process.

[0041] When the temperature of the hot water tank 12 is lower than the first preset temperature, for example, 15°C, the first water pump 16, the fourth water pump 32 and the water source heat pump 30 are turned off, so that the hot water tank 12 retains residual heat and prevents the water in the hot water tank 12 from freezing.

[0042] When the temperature of the hot water collection tank 12 is greater than the second preset temperature, for example, 45°C, the water source heat pump 30 and the fourth water pump 32 are turned off, the first water pump 16 is turned on, and the three-way valve on the second inlet pipe 58 and the three-way valve on the second return pipe 60 are adjusted so that the water in the hot water collection tank 12 flows into the hot water storage tank 14 through the second inlet pipe 58, and the water in the hot water storage tank 14 flows back to the hot water collection tank 12 through the second return pipe 60.

[0043] Continue to refer to Figure 1 The pipe antifreeze system provided in this application embodiment also includes a water replenishment device 34, which is connected to the hot water collection tank 12 and the hot water storage tank 14 and is used to replenish water to the hot water collection tank 12 and the hot water storage tank 14.

[0044] Specifically, the water replenishing device 34 comprises a first water replenishing pipe 36, a second water replenishing pipe 38 and a liquid level float ball valve 40. One end of the first water replenishing pipe 36 is connected to the heat collecting tank 12, and the other end of the first water replenishing pipe 36 is used to be connected to a water replenishing source. One end of the second water replenishing pipe 38 is connected to the heat storing tank 14, and the other end of the second water replenishing pipe 38 is used to be connected to the water replenishing source. The liquid level float ball valve 40 is located inside the heat collecting tank 12 and is connected to the first water replenishing pipe 36. Exemplarily, the water replenishing source can be a fire pipe 62, that is, the first water replenishing pipe 36 and the second water replenishing pipe 38 are both connected to the fire pipe 62.

[0045] Water from the water replenishing source flows into the heat collecting tank 12 through the first water replenishing pipe 36 and flows into the heat storing tank 14 through the second water replenishing pipe 38. When the water in the heat collecting tank 12 reaches a set water level, the liquid level float ball valve 40 closes the first water replenishing pipe 36. Of course, valves can be arranged on the first water replenishing pipe 36 and the second water replenishing pipe 38, and after water replenishing is completed, the valves on the first water replenishing pipe 36 and the second water replenishing pipe 38 are closed.

[0046] Further, the end of the second water replenishing pipe 38 relative to the heat storing tank 14 is connected to the first water replenishing pipe 36; the water replenishing device 34 further comprises a second dirt removing tank 42, a silicon phosphorus crystal tank 44 and an electronic scale removing instrument 46 arranged on the first water replenishing pipe 36 and close to the water replenishing source. The above structure can avoid impurities and scale in the water from entering the heat collecting tank 12 and the heat storing tank 14.

[0047] Continuing to refer to Figure 1 The pipe anti-freezing system provided by the embodiments of the present application further comprises a water collecting well 48, a first overflow pipe 50 and a second overflow pipe 52. Two ends of the first overflow pipe 50 are respectively connected to the heat collecting tank 12 and the heat storing tank 14. Two ends of the second overflow pipe 52 are respectively connected to the heat storing tank 14 and the water collecting well 48.

[0048] When the water in the heat collecting tank 12 exceeds a set water level, the water flows into the heat storing tank 14 from the first overflow pipe 50; when the water in the heat storing tank 14 exceeds a set water level, the water flows into the water collecting well 48 from the second overflow pipe 52.

[0049] The embodiments in the present specification are described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0050] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features thereof can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A freeze protection system for a pipe, the system comprising: The application relates to a solar energy water heating system, which comprises: a plurality of solar energy collecting plates, each of which is provided with an outlet valve and an inlet valve at the outlet and the inlet respectively; a collecting water tank, which is higher than the plurality of solar energy collecting plates and is connected to the water outlet of the plurality of solar energy collecting plates through a first water inlet pipe and to the water return pipe of the solar energy collecting plates through a first water return pipe; a heat storage water tank, which is connected to the collecting water tank through a second water inlet pipe and a second water return pipe to form a water circulation loop; a first water pump, which is installed on the second water return pipe; and a heat exchange device, which is connected to the heat storage water tank at the hot fluid inlet and the hot fluid outlet and is connected to a fire-fighting pipeline at the cold fluid inlet and the cold fluid outlet. The heat exchange device comprises a heat exchanger, a second water pump and a third water pump; 2. The freeze protection system for a pipe according to claim 1, wherein, the hot fluid inlet and the hot fluid outlet of the heat exchanger are connected to the heat storage water tank through a first heat exchange pipeline and a second heat exchange pipeline respectively, and the cold fluid inlet and the cold fluid outlet of the heat exchanger are connected to the fire-fighting pipeline through a third heat exchange pipeline and a fourth heat exchange pipeline respectively; the second water pump is installed on the first heat exchange pipeline, and the third water pump is installed on the fourth heat exchange pipeline. The heat exchange device further comprises an electric gate valve, which is installed on the fire-fighting pipeline and is located between the third heat exchange pipeline and the fourth heat exchange pipeline.

3. The freeze protection system for a pipe according to claim 2, wherein, The heat exchange device further comprises a first dirt removal tank, which is arranged on the third heat exchange pipeline.

4. The freeze protection system for a pipe according to claim 3, wherein, The application further comprises:

5. The freeze protection system for a pipe of claim 1, wherein, a water source heat pump, which is connected to the second water inlet pipe at the two ends of the heat source side through a first heat pump water inlet pipe and a first heat pump water outlet pipe respectively and is connected to the second water return pipe at the two ends of the use side through a second heat pump water inlet pipe and a second heat pump water outlet pipe respectively; a fourth water pump, which is installed on the first heat pump water inlet pipe. The application further comprises:

6. The freeze protection system for a pipe of claim 1, wherein, a water supplement device, which is connected to the collecting water tank and the heat storage water tank. The water supplement device comprises a first water supplement pipe, a second water supplement pipe and a liquid level float ball valve; 7. The freeze protection system for a pipe according to claim 6, wherein, one end of the first water supplement pipe is connected to the collecting water tank, and the other end of the first water supplement pipe is used for being connected to a water supplement source; one end of the second water supplement pipe is connected to the heat storage water tank, and the other end of the second water supplement pipe is used for being connected to the water supplement source; the liquid level float ball valve is located in the interior of the collecting water tank and is connected to the first water supplement pipe. The end of the second water supplement pipe, which is opposite to the heat storage water tank, is connected to the first water supplement pipe; 8. The freeze protection system for a pipe according to claim 7, wherein, the water supplement device further comprises a second dirt removal tank, a silicon phosphorus crystal tank and an electronic descaling instrument, which are arranged on the first water supplement pipe and are close to the water supplement source. The application further comprises:

9. The freeze protection system for a pipe of claim 1, wherein, a water collecting well; a first overflow pipe, which is connected to the collecting water tank and the heat storage water tank at the two ends respectively; a second overflow pipe, which is connected to the heat storage water tank and the water collecting well at the two ends respectively. ​

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