Anti-freezing structure of water supply pipeline

Abstract

The utility model belongs to the technical field of anti-freezing protection, and particularly relates to an anti-freezing structure of a water supply pipeline, which solves the problem that water stored in a pipe can not be completely, quickly and smoothly discharged due to the action of atmospheric pressure. The anti-freezing structure of the water supply pipeline is arranged between a water outlet assembly with a switch function and the water supply pipeline, an anti-freezing valve used for discharging water stored in the water supply pipeline is arranged at the lower end of the water supply pipeline, and the anti-freezing valve comprises a water inlet connected with a water supply source, a water outlet connected with the water supply pipeline and a water outlet used for discharging the water stored in the water supply pipeline. The water outlet of the frost valve is closed when the water inlet is communicated with the water supply pipeline, and the water inlet is closed when the water supply pipeline is communicated with the water outlet; a ventilation structure allowing air to enter but not allowing water to flow out is arranged between the frost valve and the water outlet assembly, and the ventilation structure is located at the high end of the water supply pipeline. The two ends of the water supply pipeline are communicated with the outside, so that the effect of completely, rapidly and smoothly discharging water stored in the pipeline is achieved, and the anti-freezing effect is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of antifreeze protection technology, and specifically relates to an antifreeze structure for water supply pipelines. Background Technology

[0002] Water outlet components such as faucets are connected to the water supply source through water supply pipes. In outdoor environments, due to low temperatures, the water stored in the water supply pipes may freeze, affecting the smooth use of water, or even damaging the water supply pipes or faucets. Therefore, antifreeze treatment is required.

[0003] Currently, the antifreeze structure for water supply pipelines is mostly achieved by setting up a drain valve. When the drain valve is opened, the water stored in the water supply pipeline is discharged, which can prevent the stored water from freezing and damaging the pipeline.

[0004] However, due to atmospheric pressure, even if the drain outlet of the antifreeze valve is opened, the water in the pipe may still not be able to drain out completely and quickly. The water may be trapped inside the pipe and may still freeze, so the antifreeze effect cannot be guaranteed. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a water supply pipeline antifreeze structure that can smoothly drain water stored in the pipeline.

[0006] To achieve the innovative purpose of this utility model, the following technical solution can be used: A water supply pipeline antifreeze structure is provided between a water outlet component with a switching function and a water supply pipeline. The lower end of the water supply pipeline is provided with an antifreeze valve for draining water stored in the water supply pipeline. The antifreeze valve includes a second water inlet connected to a water source, a second water outlet connected to the water supply pipeline, and a drain outlet for draining water stored in the water supply pipeline. When the second water inlet is connected to the water supply pipeline, the drain outlet is closed; when the water supply pipeline is connected to the drain outlet, the second water inlet is closed. A venting structure is provided between the antifreeze valve and the water outlet component, allowing air to enter but not water to flow out. The venting structure is located at the high end of the water supply pipeline.

[0007] The antifreeze structure for water supply pipelines of this utility model is installed in the water supply pipeline and, for example, the water outlet component of a faucet. It is used to drain the water stored in the water supply pipeline upstream of the shut-off valve of the water outlet component, to prevent the stored water from freezing in cold conditions, which would affect normal water use or even damage the water outlet component or pipeline. This antifreeze structure mainly uses an antifreeze valve to drain the stored water. Under normal water use conditions, the antifreeze valve is equivalent to a connecting pipeline, connecting the water supply pipeline and the water source in series. When drainage is needed, switching the antifreeze valve can stop the connection between the water supply pipeline and the water source, and at the same time connect the water supply pipeline to the outside through the drain outlet to achieve the effect of draining the water stored in the water supply pipeline. However, when the water outlet component is closed, due to atmospheric pressure, the water stored in the pipeline cannot flow out smoothly. Therefore, this application specially provides a venting structure at the upper end of the water supply pipeline to connect the upper end of the water supply pipeline to the atmosphere. This connection is unidirectional.

[0008] When the antifreeze valve disconnects the water supply pipe from the water source, the water supply pipe is connected to the drain pipe inside the antifreeze valve. Since there is no water pressure in the water supply pipe, air can enter the water supply pipe through the venting structure. Because both ends of the water supply pipe are open to the atmosphere, the water inside the water supply pipe can flow out smoothly and quickly under the action of gravity. There is no need to manually open the water outlet component switch; atmospheric pressure can be used to smoothly discharge the water in the water supply pipe from the antifreeze valve, achieving the antifreeze effect. When the antifreeze valve is closed, the water supply pipe is connected to the water source, and the drain pipe inside the antifreeze valve is closed. At this time, there is water pressure from the water source in the water supply pipe, so the venting structure is closed, and the water supply pipe operates normally.

[0009] In the aforementioned antifreeze structure for water supply pipelines, the venting structure includes a one-way valve. When there is water pressure in the water supply pipeline, the one-way valve is closed by pressure; when there is no water pressure in the water supply pipeline, the external atmospheric pressure can open the one-way valve.

[0010] The ventilation structure can be achieved through a one-way valve. The one-way valve allows air to enter the water supply pipeline, but water cannot flow out, ensuring smooth water supply. During normal water use, the water pressure in the water supply pipeline is greater than the air pressure, preventing external air and debris from entering and thus preventing water contamination.

[0011] As a specific optimization, the one-way valve includes a first valve body with a vent hole inside. A valve disc, which can be slidably connected within the first valve body and can cover the inner end of the vent hole to control its opening and closing, is also present. The valve disc can slide within the first valve body. When the valve disc is in contact with the vent hole, it closes the vent hole. When the valve disc moves away from the vent hole, an air passage is formed between the radially outer side of the valve disc and the side wall of the inner cavity of the first valve body, allowing outside air to enter through this air passage.

[0012] As another specific optimization, the one-way valve includes a first valve body with a vent hole and a valve disc hinged to the first valve body. When the valve disc is subjected to water pressure from the water supply pipeline, it presses against the vent hole to close the one-way valve. When the valve disc is not subjected to water pressure from the water supply pipeline, it has no contact or only slight contact with the vent hole.

[0013] In the aforementioned antifreeze structure for water supply pipelines, the venting structure includes a venting valve. The venting valve includes a first valve body, a vent hole located at the end of the first valve body, and a valve disc that can close or open the vent hole. The valve disc is connected to a switch via a guide post. A spring is sleeved on the outside of the guide post. Under the action of the spring, the valve disc always stays tightly against the vent hole to close it. Pressing the switch can overcome the spring force, causing the guide post to disengage the valve disc from the vent hole and open it.

[0014] As another parallel solution, the ventilation structure can also be implemented through a ventilation valve. Under normal circumstances, the valve disc of the ventilation valve is always in the closed state of the ventilation hole under the action of the spring. When it is necessary to open, the valve disc can be pressed to one side by pressing the guide post to overcome the spring force, so as to open the ventilation hole. This is convenient to control.

[0015] In the above-mentioned antifreeze structure for water supply pipelines, a three-way connector is provided at the high end of the water supply pipeline. The three-way connector includes a first water outlet connected to the water outlet assembly, a first water inlet connected to the water supply pipeline, and a vent port equipped with a one-way valve.

[0016] The water supply pipeline, check valve, and water outlet assembly are connected by a T-joint to ensure the functions of water supply and air intake.

[0017] In the above-mentioned antifreeze structure for water supply pipelines, the outer end of the vent is provided with a filter assembly for preventing debris from entering. The filter assembly includes a filter screen or a filter canister. The filter screen covers the vent, and the filter canister is detachably connected to the outer end of the vent via threads.

[0018] A filter assembly is installed at the outer end of the vent to prevent small insects and debris from being brought in by the incoming air, thus reducing contamination of the water supply pipeline. This filter assembly can be implemented using a filter screen or a filter canister, both of which are detachable, providing flexibility for easy replacement and maintenance. Details regarding the filter screen, filter canister, and connections are existing technology and will not be elaborated further.

[0019] In the above-mentioned antifreeze structure for water supply pipelines, the water outlet component includes a faucet; or, the water outlet component includes a water-using device and a shut-off valve connected in series between the water-using device and the water supply pipeline.

[0020] This antifreeze structure is applicable to both the water supply pipes of faucets and the water supply pipes upstream of water-using devices, offering strong compatibility. Both the faucet and the upstream side of the water-using device are equipped with shut-off valves. When the antifreeze valve is opened, the water stored in the water supply pipe between the shut-off valve and the antifreeze valve is discharged due to gravity, achieving effective antifreeze protection.

[0021] In the above-mentioned antifreeze structure for water supply pipelines, the antifreeze valve includes a drain three-way valve. The drain three-way valve includes a second outlet connected to the water supply pipeline, a second inlet connected to the water supply source, and a drain outlet for draining water stored in the water supply pipeline. It can make the second inlet connected only to the second outlet, or the drain outlet connected only to the second outlet.

[0022] The antifreeze valve achieves its intended function through a three-way drain valve. It has a simple structure. When the second outlet and the second inlet are connected, it ensures the water supply between the water source and the water supply pipeline. When the drain outlet is connected to the second outlet, it achieves the effect of draining the stored water.

[0023] In the above-mentioned antifreeze structure for water supply pipelines, the drain three-way valve includes a T-shaped second valve body and a valve ball rotatably connected to the second valve body. The valve ball is provided with a T-shaped hole. An operating part is rotatably connected to the second valve body through a connecting rod. The connecting rod passes through the second valve body and rotates synchronously with the valve ball.

[0024] The drain three-way valve consists of a second valve body and a valve ball. The second valve body has a T-shaped or triangular extending channel, within which the valve ball is positioned to control the connection between the valve ports. A connecting rod passes through the second valve body and controls the rotation of the valve ball. The operating part at the outer end of the connecting rod can be a handwheel or handle for easy user operation, while the inner end can achieve synchronous rotation through a slotted engagement between a straight-line locking body and a corresponding locking groove on the valve ball, facilitating easy assembly and disassembly. The sealing design of the valve ball within the second valve body and related details are common knowledge and will not be elaborated upon.

[0025] In the above-mentioned antifreeze structure for water supply pipelines, a water receiving component is provided below the drain outlet, or a drain pipe is connected to the drain outlet.

[0026] The drain outlet can collect the discharged water through a water receiving component, or it can be connected to the corresponding drainage point or water receiving point through a drain pipe, which maintains the environment below the drain outlet and facilitates the further use of the stored water, thus saving water resources.

[0027] In the above-mentioned antifreeze structure for water supply pipelines, the water supply pipeline is arranged vertically, the water outlet component and the venting structure are located at the high end of the water supply pipeline, and the antifreeze valve is located at the low end of the water supply pipeline, and is located close to the ground or buried underground.

[0028] In most outdoor scenarios, water supply pipes are generally installed vertically, and faucets are placed high for easy use. Burying the pipes connecting the water source and the antifreeze valve underground has a certain heat preservation effect. Of course, the operating part of the antifreeze valve needs to be exposed for easy operation.

[0029] In the aforementioned antifreeze structure for water supply pipelines, the water supply pipeline is covered with an insulation layer.

[0030] Installing an insulation layer on the water supply pipeline can be a backup antifreeze solution to prevent the water inside from freezing if drainage is forgotten.

[0031] Compared with the prior art, the present invention has the following main advantages:

[0032] The antifreeze valve of this water supply pipeline antifreeze structure can stop the connection between the water supply pipeline and the water source when drainage is needed, and at the same time connect the water supply pipeline to the outside. In addition, a venting structure is specially set at the upper end of the water supply pipeline to connect the upper end of the water supply pipeline to the atmosphere. With both ends of the water supply pipeline connected to the atmosphere, the water inside can flow out smoothly and quickly under the action of gravity, ensuring an effective antifreeze effect. This drainage action does not require opening the faucet to connect to atmospheric pressure, which is convenient and practical. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0034] Figure 2 This is a cross-sectional schematic diagram of the antifreeze valve provided by this utility model;

[0035] Figure 3 This is a cross-sectional view of the one-way valve provided by this utility model;

[0036] Figure 4 This is a cross-sectional view of the vent valve provided by this utility model.

[0037] In the diagram, the components are: water outlet assembly 1, faucet 11, water supply pipe 2, three-way connector 21, first water outlet 22, first water inlet 23, vent 24, antifreeze valve 3, drain three-way valve 31, second water outlet 32, second water inlet 33, drain outlet 34, second valve body 35, valve ball 36, operating part 37, venting structure 4, one-way valve 41, first valve body 42, vent hole 43, valve disc 44, vent valve 45, guide post 46, switch 47, and spring 48. Detailed Implementation

[0038] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0039] Example 1

[0040] Specific implementation examples Figure 1 , 2 As shown in Figure 3, the anti-freezing structure of this water supply pipeline is installed between the faucet 11 and the water supply pipeline 2. An anti-freezing valve 3 is installed at the lower end of the water supply pipeline 2 to drain water stored in the pipeline. The anti-freezing valve 3 includes a second inlet 33 connected to the water source, a second outlet 32 ​​connected to the water supply pipeline 2, and a drain outlet 34 for draining water stored in the water supply pipeline 2. When the second inlet 33 is connected to the water supply pipeline 2, the drain outlet 34 is closed; when the water supply pipeline 2 is connected to the drain outlet 34, the second inlet 33 is closed. A venting structure 4, which allows air to enter but prevents water from flowing out, is provided between the anti-freezing valve 3 and the water outlet assembly 1. The venting structure 4 is located at the upper end of the water supply pipeline 2.

[0041] Specifically, this water supply pipe antifreeze structure is used to drain the water stored in the water supply pipe 2 within the faucet 11, preventing the stored water from freezing in cold conditions and affecting normal water use or even damaging the faucet 11 or the pipe. The antifreeze valve 3 acts as a connecting pipe under normal water use conditions, connecting the water supply pipe 2 and the water source in series. When drainage is needed, it can stop the connection between the water supply pipe 2 and the water source, and at the same time connect the water supply pipe 2 to the outside, so as to achieve the effect of draining the internal water. However, when the faucet 11 is closed, the water stored in the pipe may not flow out smoothly due to atmospheric pressure. A venting structure 4 is specially set at the upper end of the water supply pipe 2 to connect the upper end of the water supply pipe 2 to the atmosphere. This connection is one-way, allowing air to enter but preventing water from flowing out, ensuring smooth water supply. Since both the upper and lower ends of the water supply pipe 2 are connected to the atmosphere, the internal water can flow out smoothly and quickly under the action of gravity, ensuring an effective antifreeze effect without having to turn on the faucet 11, making it convenient and practical.

[0042] like Figure 1 , 3 As shown, the venting structure 4 includes a one-way valve 41. When there is water pressure in the water supply pipeline 2, the one-way valve 41 is closed by pressure. When there is no water pressure in the water supply pipeline 2, the external atmospheric pressure can open the one-way valve 41. A three-way connector 21 is provided at the high end of the water supply pipeline 2. The three-way connector 21 includes a first water outlet 22 connected to the faucet 11, a first water inlet 23 connected to the water supply pipeline 2, and a vent 24 connected to the one-way valve 41.

[0043] Specifically, the ventilation structure 4 is implemented through a one-way valve 41. The one-way valve 41 allows air to enter the water supply pipe 2, but water cannot flow out, ensuring smooth water supply in the water supply pipe 2. During normal water use, the water pressure in the water supply pipe 2 is greater than the air pressure, preventing external air and debris from entering and thus preventing water contamination. The water supply pipe 2, the one-way valve 41, and the faucet 11 are connected by a three-way connector 21 to ensure the functions of water supply and air intake.

[0044] In this embodiment, the one-way valve 41 includes a first valve body 42, which has a vent hole 43. A valve disc 44 is slidably connected within the first valve body 42 and can be closed onto the inner end of the vent hole 43 to control its opening and closing. The valve disc 44 can slide within the first valve body 42. An elastic element is provided between the valve disc 44 and the first valve body 42, which tends to move the valve disc 44 toward the vent hole 43. When the valve disc 44 is in contact with the vent hole 43, the vent hole 43 is closed. Of course, the elastic force of the elastic element is small. When the internal water pressure decreases, the external atmospheric pressure can easily overcome the elastic force to push the valve disc 44 open. When the valve disc 44 moves away from the vent hole 43, an air passage is formed between the radial outer side of the valve disc 44 and the side wall of the inner cavity of the first valve body 42, and outside air can enter through the air passage.

[0045] As an optimization of this embodiment, the outer end of the vent 24 is provided with a filter assembly for preventing debris from entering. The filter assembly includes a filter screen that covers the vent 24.

[0046] Specifically, a filter assembly is provided at the outer end of the vent 24 to prevent small insects, debris, etc. from being brought in when the air enters, thereby reducing pollution to the inside of the water supply pipe 2. The filter assembly is achieved through a filter screen, which covers the vent 24 and is fixed in a detachable manner with a hoop, providing flexible disassembly and facilitating timely replacement and maintenance.

[0047] like Figure 1 , 2 As shown, the antifreeze valve 3 includes a drain three-way valve 31. The drain three-way valve 31 includes a second outlet 32 ​​connected to the water supply pipeline 2, a second inlet 33 connected to the water supply source, and a drain outlet 34 for draining water stored in the water supply pipeline 2. It can be configured such that the second inlet 33 is only connected to the second outlet 32, or the drain outlet 34 is only connected to the second outlet 32. The drain three-way valve 31 includes a T-shaped second valve body 35 and a valve ball 36 rotatably connected to the second valve body 35. The valve ball 36 has a T-shaped hole. An operating part 37 is rotatably connected to the second valve body 35 via a connecting rod. The connecting rod passes through the second valve body 35 and rotates synchronously with the valve ball 36.

[0048] Specifically, the antifreeze valve 3 achieves its intended function through the drain three-way valve 31. It has a simple structure. When the second outlet 32 ​​and the second inlet 33 are connected, it ensures water supply between the water source and the water supply pipeline 2. When the drain outlet 34 is connected to the second outlet 32, it discharges stored water. The drain three-way valve 31 consists of a second valve body 35 and a valve ball 36. The second valve body 35 has a T-shaped channel, and the valve ball 36 is located within this channel to control the connection status between the valve ports. A connecting rod passes through the second valve body 35 to control the rotation of the valve ball 36. The operating part 37 at the outer end of the connecting rod facilitates user operation, while the inner end can be engaged with a corresponding slot on the valve ball 36 through a straight clamp to achieve synchronous rotation, making assembly and disassembly convenient.

[0049] As an optimization, a water receiving component (not shown in the figure) is provided below the drain outlet 34. The drain outlet 34 can collect the discharged water through the water receiving component, which is specifically a water tank. This maintains the environment below the drain outlet 34 and facilitates the further utilization of the stored water, thus saving water resources.

[0050] In this embodiment, the water supply pipe 2 is arranged vertically, the faucet 11 and the vent structure 4 are located at the high end of the water supply pipe 2, the antifreeze valve 3 is located at the low end of the water supply pipe 2 and is partially buried underground, with the operating part 37 exposed. The water supply pipe 2 is covered with an insulation layer (not specifically shown in the figure).

[0051] Specifically, the water supply pipe 2 is installed vertically, and the faucet 11 is placed at a high position for easy use. The pipes connecting the water source and the antifreeze valve 3 are buried underground to provide a certain degree of insulation. The operating part 37 of the antifreeze valve 3 is exposed for easy operation. The insulation layer on the water supply pipe 2 serves as a backup antifreeze solution to prevent water from freezing inside if drainage is forgotten.

[0052] Specific working principle: Under normal water supply conditions, the second inlet 33 of the drain three-way valve 31 is connected, and the drain outlet 34 is closed. When water is needed, the faucet 11 is opened, and the water output from the water supply source is released from the faucet 11 after passing through the drain three-way valve 31, the water supply pipeline 2 and the three-way connector 21. When water is not needed, the faucet 11 is closed.

[0053] When antifreeze is required in cold conditions, turn the operating part 37 of the drain three-way valve 31 to close the second water inlet 33 and open the drain outlet 34. The water stored in the water supply pipeline 2 will be discharged from the drain outlet 34. At the same time, air enters the vent 24 of the three-way connector 21 to ensure that the stored water is discharged smoothly and quickly.

[0054] Example 2

[0055] The working principle of this embodiment is basically the same as that of embodiment 1, except that the ventilation structure 4 is different.

[0056] Specific implementation examples Figure 4 As shown, the ventilation structure 4 includes a ventilation valve 45, which includes a first valve body 42, a ventilation hole 43 disposed in the end of the first valve body 42, and a valve disc 44 that can close or open the ventilation hole 43. The valve disc 44 is connected to a switch 47 through a guide post 46. A spring 48 is sleeved on the outside of the guide post 46. Under the action of the spring 48, the valve disc 44 always fits tightly against the ventilation hole 43 to close the ventilation hole 43. Pressing the switch 47 can overcome the elastic force of the spring 48, causing the guide post 46 to disengage the valve disc 44 from the ventilation hole 43 and open the ventilation hole 43.

[0057] Specifically, the ventilation structure 4 controls the opening and closing of the ventilation hole 43 through the ventilation valve 45. Under normal circumstances, the valve disc 44 of the ventilation valve 45 is always in the closed state of the ventilation hole 43 under the action of the spring 48. When it is necessary to open, the valve disc 44 can be pressed to one side by pressing the guide post 46 to overcome the elastic force of the spring 48, thereby achieving the effect of opening the ventilation hole 43. The control is convenient.

[0058] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A water supply pipeline antifreeze structure, disposed between a water outlet assembly (1) with a switch function and a water supply pipeline (2), characterized in that, The lower end of the water supply pipeline (2) is provided with an antifreeze valve (3) for draining water stored in the water supply pipeline (2). The antifreeze valve (3) includes a second inlet (33) connected to the water supply source, a second outlet (32) connected to the water supply pipeline (2), and a drain outlet (34) for draining water stored in the water supply pipeline (2). The drain outlet (34) is closed when the second inlet (33) is connected to the water supply pipeline (2), and the second inlet (33) is closed when the water supply pipeline (2) is connected to the drain outlet (34). A ventilation structure (4) that allows air to enter but does not allow water to flow out is also provided between the antifreeze valve (3) and the water outlet assembly (1). The ventilation structure (4) is located at the upper end of the water supply pipeline (2).

2. The antifreeze structure for water supply pipelines according to claim 1, characterized in that, The ventilation structure (4) includes a one-way valve (41). When there is water pressure in the water supply pipeline (2), the one-way valve (41) is closed by pressure. When there is no water pressure in the water supply pipeline (2), the external atmospheric pressure can open the one-way valve (41).

3. The antifreeze structure for water supply pipelines according to claim 1, characterized in that, The ventilation structure (4) includes a ventilation valve (45), which includes a first valve body (42), a ventilation hole (43) located in the end of the first valve body (42), and a valve disc (44) that can close or open the ventilation hole (43). The valve disc (44) is connected to a switch (47) via a guide post (46). A spring (48) is sleeved on the outside of the guide post (46). Under the force of the spring (48), the valve disc (44) always stays close to the ventilation hole (43) to close the ventilation hole (43). Pressing the switch (47) can overcome the elastic force of the spring (48) and cause the guide post (46) to disengage the valve disc (44) from the ventilation hole (43) and open the ventilation hole (43).

4. The antifreeze structure for water supply pipelines according to claim 2 or 3, characterized in that, The water supply pipeline (2) is provided with a three-way connector (21) at its high end. The three-way connector (21) includes a first water outlet (22) connected to the water outlet assembly (1), a first water inlet (23) connected to the water supply pipeline (2), and a vent (24) provided with a one-way valve (41) or a vent valve (45).

5. The antifreeze structure for water supply pipelines according to claim 4, characterized in that, The vent (24) is provided with a filter assembly at its outer end to prevent debris from entering. The filter assembly includes a filter screen or a filter canister. The filter screen covers the vent (24), and the filter canister is detachably connected to the outer end of the vent (24) by a thread.

6. The antifreeze structure for water supply pipelines according to claim 1, characterized in that, The water outlet component (1) includes a faucet (11); Alternatively, the water outlet assembly (1) may include a water-using device and a shut-off valve connected in series between the water-using device and the water supply line (2).

7. The antifreeze structure for water supply pipelines according to claim 1, characterized in that, The antifreeze valve (3) includes a drain three-way valve (31), which includes a second outlet (32) connected to the water supply pipeline (2), a second inlet (33) connected to the water supply source, and a drain outlet (34) for draining water stored in the water supply pipeline (2). The drain three-way valve (31) enables the second inlet (33) to be connected only to the second outlet (32), or the drain outlet (34) to be connected only to the second outlet (32).

8. The antifreeze structure for water supply pipelines according to claim 7, characterized in that, The drain three-way valve (31) includes a T-shaped second valve body (35) and a valve ball (36) rotatably connected inside the second valve body (35). The valve ball (36) is provided with a T-shaped hole. An operating part (37) is rotatably connected to the second valve body (35) through a connecting rod. The connecting rod passes through the second valve body (35) and rotates synchronously with the valve ball (36).

9. The antifreeze structure for water supply pipelines according to claim 7, characterized in that, A water receiving component is provided below the drain outlet (34), or a drain pipe is connected to the drain outlet (34).

10. The antifreeze structure for water supply pipelines according to any one of claims 1-3 and 6-9, characterized in that, The water supply pipeline (2) is set vertically, the water outlet component (1) and the ventilation structure (4) are set at the high end of the water supply pipeline (2), the antifreeze valve (3) is set at the low end of the water supply pipeline (2) and is set close to the ground or buried underground; the water supply pipeline (2) is covered with a heat insulation layer.

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