Frost protection assembly for a tap

Abstract

This utility model belongs to the field of faucet antifreeze technology, and specifically relates to a faucet antifreeze component that solves the problem of outdoor faucets being unable to prevent freezing. The faucet antifreeze component includes a tubular body with a water passage inside. Its key feature is that one end of the tubular body is an inlet for connecting to a water supply pipe, and the other end is an outlet for connecting to or integrating with the faucet. The inlet end is equipped with a shut-off valve, which can cut off or open the water passage under the control of a switch mechanism. A vent valve is located downstream of the inlet end of the tubular body, allowing connection between the water passage and the outside atmosphere. The antifreeze component includes an antifreeze state and a water-flow state. The antifreeze state is when the shut-off valve is closed and the vent valve is open; the water-flow state is when the shut-off valve is open and the vent valve is closed. This achieves a drain-type antifreeze effect for outdoor faucets.

Description

Technical Field

[0001] This utility model belongs to the field of faucet antifreeze technology, and specifically relates to a faucet antifreeze component. Background Technology

[0002] Faucets are common components used to turn water on and off. In cold environments, especially cold outdoor environments, temperatures below freezing point will cause water to freeze. The volume of ice is greater than that of liquid water for the same amount of water. This volume change can easily damage the faucet and affect normal outdoor water use.

[0003] Currently, in existing technologies, antifreeze components for water supply pipes and faucets are mostly achieved by setting up drain valves to drain the water stored in the water supply pipes and faucets.

[0004] However, due to atmospheric pressure, even if the drain outlet of the antifreeze valve is opened, the water in the pipe may not be able to be drained completely and quickly. The water may be trapped in the pipe and difficult to drain, 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 faucet antifreeze component.

[0006] To achieve the innovative objectives of this utility model, the following technical solutions can be used: A faucet antifreeze component includes a tubular body with a water passage inside. One end of the tubular body is an inlet for connecting to a water supply pipe, and the other end is an outlet for connecting to or integrating with a faucet. The inlet is equipped with a shut-off valve, which can cut off or open the water passage under the control of a switch structure. A vent valve is provided on the downstream side of the tubular body at the inlet, allowing connection between the water passage and the outside atmosphere. The antifreeze component includes an antifreeze state and a water-flow state. The antifreeze state is when the shut-off valve is closed and the vent valve is open, and the water-flow state is when the shut-off valve is open and the vent valve is closed.

[0007] The antifreeze principle of this component is a drain-type antifreeze. After the water flow channel is closed, the faucet is opened to drain the water stored in the main body and the faucet. The vent valve allows external air to flow through the water channel. Under the action of atmospheric pressure and the gravity of the water stored in the faucet, the water stored in the tubular main body and the faucet flows out along the faucet, thereby draining the water stored in the main body and the faucet and achieving antifreeze.

[0008] Outdoor faucet water supply pipes are usually buried in walls for frost protection. If not buried in walls, they are usually wrapped with insulation cotton on the outside of the pipe, and the material is basically PPR pipe, which itself has a certain frost protection effect. Therefore, to prevent the faucet from freezing, it is only necessary to ensure that the side connected to the water supply pipe is frost-proof. The shut-off valve of this application is set at the water inlet end. The shut-off valve directly cuts off the water flow from the water inlet end, so that there is no water in the pipe body. Even if there is a certain space between the water inlet end and the shut-off valve due to the installation space requirements of the shut-off valve, since the water inlet end is screwed into the water supply pipe, and the part of the water inlet end that connects to the tap water pipe is also covered by the water supply pipe, the water remaining between the water inlet end and the shut-off valve will not freeze when the water supply pipe has a frost protection effect. Therefore, by using the anti-freeze component of this application, all water leaking from the external part connected to the water supply pipe can be drained, effectively preventing the faucet from freezing.

[0009] In the aforementioned faucet antifreeze assembly, the water shut-off valve is positioned at the water inlet end parallel to the axial direction of the tubular body.

[0010] The water shut-off valve is parallel to the axial direction of the main body, which allows the water shut-off valve to be directly closed at the end of the water inlet. This ensures that all or almost all of the water stored in the main body can be drained after the water shut-off valve is closed, ensuring that there is no water stored in the main body and effectively preventing freezing.

[0011] In the aforementioned faucet antifreeze assembly, a positioning step is provided on one side of the tubular body at the water inlet end, and a water inlet is formed within the positioning step. The water shut-off valve includes a first valve core that can seal and cooperate with the positioning step, and the first valve core is used to close and open the water inlet.

[0012] The preferred positioning step is a ring-shaped portion that extends circumferentially and protrudes radially inward. Alternatively, the positioning step can be formed by setting the water inlet end to have a larger inner diameter, resulting in a positioning step due to the difference in inner diameter. The shut-off valve can close the water inlet to cut off the water flow, or it can open the water inlet to allow normal water supply to the faucet.

[0013] In the aforementioned faucet antifreeze assembly, the first valve core has a first valve stem on the side away from the water inlet. The first valve stem passes through the water inlet and its outer diameter is smaller than the inner diameter of the water inlet. The first valve stem is connected to the switch structure.

[0014] The first valve core and the first valve stem form a T-shaped structure. The first valve core is used to switch the water inlet. The outer diameter of the first valve stem is smaller than that of the water inlet, so that a gap for water to pass through is formed between the first valve stem and the water inlet. The first valve stem positions the axial movement of the first valve core on the one hand, and also has a transmission function between the first valve core and the switching structure on the other hand.

[0015] In the above-mentioned faucet antifreeze component, the positioning step is annular, the first valve core includes an outer wall in the shape of a column or a cone, and a first sealing ring is fitted on the outer wall. The first sealing ring can seal against the inner periphery of the inner end face of the positioning step, or the positioning step is provided with an inner sealing cone surface with a large opening facing the water inlet end, and the first sealing ring can seal against the inner sealing cone surface. Alternatively, the outer diameter of the first valve core is larger than the inner diameter of the positioning step, and the first valve core has a first sealing ring embedded on one end face near the rod body, and the first sealing ring can seal against the inner end face of the positioning step. The first sealing ring is located on the side of the inlet near the water inlet end.

[0016] The first valve core achieves a sealing fit with the step surface or radial inner side of the positioning step near the water inlet end through its end face or side face. Of course, a first sealing ring is provided between them to ensure the sealing performance. The first sealing ring can be an O-ring, a wrap-around sealing ring, or a silicone ring.

[0017] As the first option, the cross-section of the positioning step is similar to a right trapezoid, with the acute angle of the right trapezoid pointing radially inward, the short base located on the upstream side, and the long waist corresponding to the inner sealing cone surface. The shape of the first valve core corresponds to the positioning step, and its conical outer wall can be fitted with the inner sealing cone surface to achieve a sealing fit. The first sealing ring is preferably sleeved on the conical outer wall of the first valve core, or it can be embedded in the inner sealing cone surface. Of course, the corresponding components are provided with grooves for sleeved or embedded sealing rings.

[0018] As a second option, both the positioning step and the first valve core have rectangular cross-sections. The outer diameter of the first valve core is larger than the inlet, meaning that its axial projection can completely cover the inlet. In this option, the first sealing ring can be set on the opposite surface of the first valve core or the positioning step. When the inlet is closed, the first valve core is axially pressed against the positioning step to achieve a sealing fit.

[0019] As a third option, the cross-section of the positioning step is rectangular, the first valve core is conical, and the first sealing ring is set on the outer conical outer wall of the first valve core, which can seal and cooperate with the outer periphery of the inlet near the inlet end.

[0020] Furthermore, the first valve core is located upstream of the inlet. When the inlet is closed, the water pressure in the water supply pipe can push the first valve core towards the positioning step, which is equivalent to having a "self-locking" function to ensure the sealing effect. It is not necessary to apply a large external force to the first valve core to ensure that it moves towards the positioning step. In other words, only a starting force is needed to move the first valve core towards the positioning step to switch from the water-flowing state to the sealed state. The subsequent maintenance of the sealed state is achieved with the assistance of the water pressure in the water supply pipe.

[0021] In the aforementioned faucet antifreeze assembly, an elastic component is provided between the first valve stem and the tubular body, which enables the first valve core to always have a tendency to close the water inlet.

[0022] In the aforementioned faucet antifreeze assembly, the elastic component is a first spring. One end of the first spring directly or indirectly abuts against the back of the positioning step away from the water inlet, and the other end abuts against the spring abutment part on the first valve stem.

[0023] The first spring is sleeved on the first valve stem and located on the side of the inlet near the outlet, and can apply an axial elastic force to the first valve stem toward the outlet.

[0024] In the aforementioned faucet antifreeze assembly, the positioning step is provided with a valve stem bracket on the side away from the water inlet for guiding the first valve stem. The first valve stem passes through the valve stem bracket, and the first spring is located inside the valve stem bracket.

[0025] The valve stem bracket serves two purposes: firstly, it axially positions the first valve stem, allowing it to extend and retract axially along the axis of the water passage, ensuring the first valve core and the inlet remain coaxial and guaranteeing a sealing effect; secondly, the valve stem bracket also provides a mounting position for the first spring.

[0026] In the aforementioned faucet antifreeze assembly, the valve stem bracket includes a guide plate, and at least three support legs extending along the thickness direction are provided on one side of the guide plate. The support legs abut against the back of the positioning step, and one end of the first spring abuts against the back of the positioning step, while the other end abuts against the spring abutment portion. Alternatively, the valve stem support includes two parallel guide plates, with a plurality of support legs extending along the thickness direction connected between the opposite surfaces of the two guide plates, and the first spring is located between the two guide plates, with one end abutting against the spring contact portion and the other end abutting against the guide plate on the positioning step side. The first spring causes the first valve stem to tend to move toward the outlet end.

[0027] Preferably, the valve stem support can be composed of two parallel guide plates and supporting legs connecting the guide plates, which is similar to a fully enclosed frame. One of the guide plates abuts against the side of the positioning step near the water outlet. The first spring is located inside the valve stem support, with one end abutting against the positioning step through the guide plate and the other end abutting against the spring abutting part on the first valve stem, so that an elastic force is applied to the first valve stem towards the water outlet. The spring abutting part can specifically be a rod-shaped part or a plate-shaped part radially arranged on the first valve stem.

[0028] Alternatively, the valve stem support can also consist of a guide plate and several support legs vertically connected to the guide plate, similar to a semi-enclosed frame. The first spring is located between the positioning step and the valve stem support. The support legs are mainly used to keep the guide plate perpendicular to the water passage. The guide plate can be located on the side of the spring abutment near the water inlet end. One end of the spring abuts against the spring abutment through the guide plate. In this state, the guide plate slides axially with the first valve stem. Alternatively, the guide plate can also be located on the other side of the spring abutment and fixed to the first valve stem by a limiting buckle, or directly fixed to the inner wall of the water passage.

[0029] In the aforementioned faucet antifreeze assembly, a guide hole is provided through the axis of the guide plate, the first valve stem passes through the guide hole, and the outer end of the valve stem bracket is pressed against the inner wall of the tubular body after being tightened by an open spring. The outer diameter of the guide plate is adapted to the inner diameter of the water passage, and the guide plate is also provided with a hollow structure that runs through the thickness direction.

[0030] The guide plate is generally circular with a guide hole at its center for guiding and positioning the first valve stem. The middle section has a hollow structure to ensure smooth water flow. The outer diameter of the guide plate matches the inner diameter of the water passage to ensure the valve stem support is coaxially aligned with the water passage. Furthermore, an open spring is provided at the outer end of the valve stem support to prevent axial movement. In a double-guide-plate design, the valve stem support can be firmly pressed against the positioning step by the first spring, and the open spring further ensures the installation stability of the valve stem support. A single-guide-plate valve stem support is mainly stably installed within the water passage by the open spring.

[0031] In the aforementioned antifreeze faucet assembly, the vent valve includes a tubular mounting platform integrally or detachably fixed to the wall of the tubular body. The tubular mounting platform has an axially penetrating valve stem mounting hole, in which a second valve stem is provided. A circumferential sealing structure is provided between the second valve stem and the valve stem mounting hole. The second valve stem is provided with the venting structure. By circumferentially rotating and / or axially extending and retracting the second valve stem, the venting structure can be controlled to switch between a venting state connecting the water passage and the outside atmosphere, and an isolation state cutting off the connection between the water passage and the outside atmosphere.

[0032] A tubular mounting platform extends radially onto the tubular body. The tubular body can be detachably installed via threads. Its axially penetrating valve stem mounting hole communicates with the water passage. A second valve stem is installed in the valve stem mounting hole. A circumferential sealing structure prevents water leakage from the gap between the second valve stem and the valve stem mounting hole. A venting structure controls the flow of water between the water passage and the outside. In the venting state, the water passage can communicate with the outside by passing through the circumferential sealing structure, making the air pressure inside and outside the tubular body the same. At this time, opening the faucet will allow the water inside to be discharged smoothly. In the isolation state, the water passage is sealed to ensure smooth water flow.

[0033] In the aforementioned faucet antifreeze assembly, the ventilation structure includes at least two ventilation holes disposed on the second valve stem. The ventilation holes are connected by a connecting channel. In the ventilation state, the ventilation holes are distributed on the inner and outer sides of the circumferential sealing structure. In the isolation state, the ventilation holes are located on the same side of the circumferential sealing structure.

[0034] Two sets of vent holes are distributed along the axial direction of the second valve stem. The connecting channel opens up each vent hole. By controlling all vent holes to be located on the same side or opposite side of the circumferential sealing structure, the venting state and the isolation state can be switched. Preferably, in the isolation state, all vent holes are located on the inner side to avoid external dust from clogging the vent holes or the connecting channel.

[0035] In the aforementioned faucet antifreeze assembly, the connecting channel is axially through or blind-hole type from the upper end of the second valve stem. One vent is provided on the side wall of the second valve stem, and the other vent is provided on the side wall of the second valve stem or at the bottom of the second valve stem. A sealing plug is provided in the connecting channel on the side of the vent far from the water passage. Alternatively, the connecting channel is opened axially as a blind hole from the bottom of the second valve stem, with one vent hole located on the side wall of the second valve stem and the other vent hole serving as the lower inlet of the connecting channel.

[0036] For ease of description, we will assume there are two vents here. One vent is located on the side wall of the second valve stem, while the other can be located on the side of the second valve stem or at the end of the second valve stem. In any case, they are not in the same axial position.

[0037] Regarding the connecting channel, for ease of processing, it is preferably implemented by an axial blind hole type opening from the outer end of the second valve stem. Both vent holes are located on the side wall of the second valve stem and radially communicate with the connecting channel. In this case, to prevent water leakage at the upper end of the connecting channel, a sealing plug is provided in the connecting channel on the side away from the water passage of all vent holes. This sealing plug is made of elastic material and can seal with the connecting channel. As a second option, the second valve stem can be axially penetrating, with the upper vent hole located on the side wall of the second valve stem, and the lower vent hole being the lower open end of the connecting channel. In this case, a sealing plug is also required. As a third option, the connecting channel can also be implemented by an axial blind hole type opening from the inner end of the second valve stem. In this case, the sealing plug can be omitted. For explanation, the aforementioned outer end is the end away from the water passage, and the lower end is the end inserted into the water passage. The sealing plug can be tightly fitted into the connecting channel or fixed in the connecting channel by threads. The end of the sealing plug away from the vent hole can also abut against the body of the limiting rod on the second valve stem, which is mentioned below.

[0038] In the aforementioned faucet antifreeze assembly, the second valve stem is provided with a radially extending limiting rod, and the side of the tubular mounting platform is provided with a radially extending limiting groove, and the limiting rod slides within the limiting groove. The limiting groove includes an axially extending telescopic section and a circumferentially extending rotating section. The rotating section is an upwardly inclined straight line or an arc or zigzag shape with its front end bent towards the telescopic section. The limiting rod can abut against the top surface of the sealing plug in the connecting channel to limit the axial movement of the sealing plug.

[0039] The second valve stem can extend, retract, or rotate within the valve stem mounting hole. To limit the extension, retraction, and rotation positions, a limiting rod on the second valve stem slides in the J-shaped limiting groove of the tubular mounting platform. The extension section guides the extension and retraction of the second valve stem, while the rotation section rotates the second valve stem after it has extended or retracted to achieve the extension and retraction limit.

[0040] In the aforementioned faucet antifreeze assembly, the circumferential sealing structure includes a second sealing ring, a sealing ring groove is provided in the valve stem mounting hole, the second sealing ring is snapped in the sealing ring groove, and its inner side is sealed to the second valve stem. Alternatively, the second valve stem has a sealing ring groove, and the second sealing ring is fitted inside the sealing ring groove, with its outer side sealingly engaging with the inner wall of the valve stem mounting hole.

[0041] The inner and outer rings of the second sealing ring are always in contact with the outer wall of the second valve stem and the inner wall of the valve stem mounting hole, ensuring circumferential and sliding seals. Specific installation positions and details are common knowledge and will not be elaborated further.

[0042] In the aforementioned faucet antifreeze assembly, a second spring is provided in the valve stem mounting hole and sleeved on the second valve stem. The two ends of the second spring abut against the upper abutment part on the second valve stem and the lower abutment part in the valve stem mounting hole, respectively. The upper abutment part is a limiting rod extending radially on the second valve stem, and the lower abutment part is an abutment boss protruding radially on the inner wall of the valve stem mounting hole.

[0043] The second spring exerts an outward elastic tendency on the second valve stem, enabling it to remain at the uppermost end of the telescopic section and also to remain within the rotating section after the limiting rod rotates into it. This rotating section is arc-shaped or L-shaped, with at least the front end bent upwards to prevent the limiting rod from sliding out. Preferably, the limiting rod is inserted through the second valve stem, with two sets of centrally symmetrical limiting grooves corresponding to each end of the limiting rod. In a scheme where a sealing plug is provided within the connecting channel, the middle portion of the limiting rod passes through the connecting channel, and the sealing plug is located below the limiting rod, allowing it to be downwardly limited by the limiting rod to prevent it from detaching from the upper end of the connecting channel.

[0044] In the aforementioned faucet antifreeze assembly, an operating cap is fixed to the upper end of the second valve stem, and a lifting gap is provided between the inner top surface of the operating cap and the top surface of the tubular mounting platform. The control cap includes a cap body with a U-shaped cross-section and a rotating lug extending radially on the cap body. The cap body is fitted onto the upper end of the tubular mounting platform, and a through hole is provided on the cap body that is axially connected to the second valve stem.

[0045] The control cap is used by the user to rotate or insert the second valve stem. Its main body is a U-shaped cap with an opening slightly larger than the outer wall of the valve stem mounting platform. The through hole on the cap can be used to insert a bolt. The lower end of the bolt is connected to the top of the second valve stem to fix the control cap and the second valve stem. In addition, there is a gap between the inner top surface of the cap and the top of the tubular mounting platform for the lifting and lowering action of the control cap connected to the second valve stem.

[0046] In the aforementioned faucet antifreeze assembly, the switch structure includes a transmission part disposed at the lower end of the second valve stem of the vent valve. The transmission part is in contact with the inner end of the first valve stem of the shut-off valve and can convert the rotation and / or extension / retraction of the second valve stem into the axial extension / retraction of the first valve stem.

[0047] The transmission unit is located at the lower end of the second valve stem and can control the axial extension and retraction of the first valve stem by moving the second valve stem. Furthermore, the transmission unit also links the vent valve and the shut-off valve for coordinated control. Users only need to operate the control cap to achieve synchronous control of the vent valve and the shut-off valve. When the vent valve switches to the isolation state, the shut-off valve switches to the water-flow state; when the vent valve switches to the venting state, the shut-off valve switches to the corresponding antifreeze state, improving operational convenience. Of course, the antifreeze protection of the present application should also include a scheme where the vent valve and the shut-off valve are completely independent parts.

[0048] In the aforementioned faucet antifreeze assembly, the transmission part is conical, and the inner end of the first valve stem slides in contact with the conical transmission surface of the transmission part. In the antifreeze state, the inner end of the first valve stem is close to the small diameter end, and in the water-flow state, the inner end of the first valve stem is close to the large diameter end. Alternatively, the transmission part is shaped like a cam column, with the inner end of the first valve stem slidingly contacting the outer cylindrical wall of the transmission part. In the antifreeze state, the inner end of the first valve stem is close to the thick wall of the transmission part, and in the water-flow state, the inner end of the first valve stem is close to the thin wall of the transmission part.

[0049] The transmission part is preferably tapered. The outer diameter of the transmission part changes axially. By controlling the axial extension and retraction of the second valve stem, the inner end of the first valve stem is always in contact with the transmission part under the elastic force of the first spring, but the outer diameter of the contact position is different, thus achieving the effect of controlling the axial extension and retraction of the first valve stem.

[0050] The transmission unit is preferably in the form of a cam. Specifically, it can be an eccentrically set perfect circle, an axially set or eccentrically set ellipse, or even an irregular shape with an arc-shaped outer wall. In short, it needs to have multiple areas with different thicknesses from the axis of the second valve stem. By rotating the second valve stem, the extension and retraction control of the first valve stem can be achieved. Of course, since the second valve stem needs to extend and retract to satisfy the on / off control of the vent valve, the axial length of the transmission unit should be greater than the extension and retraction distance of the second valve stem to ensure that the first valve stem never disengages from the transmission unit.

[0051] As another feasible solution for the switch structure, the switch structure includes a lever rotatably connected to the outside of the tubular body. The rotating end of the lever is connected to the end of the first valve stem of the water shut-off valve via a cable. The cable passes through a cable through hole on the tubular body, and the cable through hole and the cable are circumferentially sealed. The cable is a flexible cable, and the cable body extends and retracts within the cable through hole; Alternatively, the cable may be a rigid cable with two hinged ends, one of which rotates in the cable through hole via a sealed pivot and its outer end is connected to the lever, and the other rigid cable is located in the water passage and its inner end is hinged to the end of the first valve stem.

[0052] In this parallel scheme, the switch structure and the vent valve are completely independent. Since the first valve stem remains axially positioned by the valve stem support, the cable can be a flexible cable capable of pulling the first valve stem with a tensile force forming an acute angle with its axial direction. The radial component of the force cancels out the wall support force of the tubular body, while the axial component is used to specifically pull the first valve stem downstream. The flexible cable can be, for example, a thin, bendable wire, or even a flexible rope. To prevent leakage, a corresponding sealing structure is also provided between the cable and the cable passage. This sealing structure is common knowledge and will not be elaborated further. Alternatively, the telescopic part of the cable can be replaced by a sealing slider that matches the cross-section of the cable passage. This sealing slider has no deformation capability, ensuring a good seal.

[0053] The cable can also be two rigid cables. One rigid cable passes through the cable through hole and is rotatably connected to a radially extending sealing shaft in the cable through hole. The sealing shaft is in sliding sealing fit with the inner wall of the cable through hole. The lever controls the swing of the rigid cable. The other cable is located in the water passage and rotates the swing motion to the extension and retraction of the first valve stem. Of course, flared relief grooves are provided at both ends of the cable through hole to ensure the swing of the rigid cable.

[0054] As another feasible solution for the vent valve, the vent valve includes a valve core mounting hole provided on the wall of the tubular main body, a vent valve core is provided in the valve core mounting hole, the valve core mounting hole is connected to the water channel and the outside atmosphere, and the vent valve core can control the opening and closing of the valve core mounting hole.

[0055] In this parallel scheme, the vent valve controls the opening and closing of the water passage and the outside atmosphere through the vent valve core. The vent valve core is actually similar to the valve core on a tire. It has a simple structure and is existing technology, so it will not be elaborated on.

[0056] In the aforementioned faucet antifreeze assembly, the tubular body has external or internal threads at the inlet and outlet ends, and the cross-section of the outer wall of the tubular body is square, hexagonal, or octagonal.

[0057] The tubular body has a small outer diameter at the inlet end, allowing it to be inserted into the end of the corresponding water supply pipe. A waterproof connection is achieved via external threads and Teflon tape. The outlet end is used to insert into a faucet and is connected via internal threads. Of course, if the tubular body and faucet are integrated, the internal thread at the outlet end is unnecessary. The tubular body can be designed in various shapes, including but not limited to square, hexagonal, or octagonal, allowing it to be rotated using appropriate wrenches for easy assembly and disassembly.

[0058] Furthermore, the antifreeze faucet corresponding to this antifreeze component includes a faucet body, the water inlet end of the faucet body is provided with the aforementioned antifreeze component, the water outlet end of the tubular body of the antifreeze component is detachably or integrally connected to the water inlet end of the faucet body, the water inlet end of the tubular body is provided with a connecting structure for connecting a water supply pipe, the water supply pipe and at least the water inlet end of the tubular body are embedded in the insulation body, the insulation body includes a wall, a column, a PVC pipe, and an insulation layer.

[0059] The antifreeze faucet consists of a faucet body and an antifreeze component. These can be two separate parts. The antifreeze component is compatible with faucet bodies that have standard connectors, allowing for subsequent assembly and connection. Alternatively, the antifreeze component can be integrated directly into the faucet body. The connection structure at the water inlet of the tubular body can be an external threaded connector, allowing connection to the water supply pipe. As a standard implementation, and to meet antifreeze requirements, the water supply pipe and the water inlet of the tubular body are insulated by a thermal insulation material. This part itself is not easily damaged by freezing. The faucet body and the antifreeze component downstream of the water inlet achieve the antifreeze effect by adjusting them to the appropriate antifreeze setting, making it particularly suitable for outdoor use in cold regions.

[0060] Compared with the prior art, the present invention has the following main advantages: 1. The antifreeze principle of this antifreeze component is water-draining antifreeze. That is, after the water flow channel is closed, the faucet is opened to drain the water stored in the main body and the faucet. The vent valve allows the outside air to communicate with the water flow channel. Under the action of atmospheric pressure and the gravity of the water stored in the faucet, the water stored in the tubular main body and the faucet flows out along the faucet, thereby draining the water stored in the main body and the faucet and achieving antifreeze.

[0061] 2. Outdoor faucet water supply pipes are usually buried in walls for frost protection. If not buried in walls, they are usually wrapped with insulation cotton on the outside of the pipe, and the material is basically PPR pipe, which itself has a certain frost protection effect. Therefore, to achieve faucet frost protection, it is only necessary to ensure that the side from which the water supply pipe is connected is frost-proof. The shut-off valve of this application is set at the water inlet end. The shut-off valve directly cuts off the water flow from the water inlet end, so that there is no water in the pipe body. Even if there is a certain space between the water inlet end and the shut-off valve due to the installation space requirements of the shut-off valve, since the water inlet end is screwed into the water supply pipe, and the part of the water inlet end that connects to the tap water pipe is also covered by the water supply pipe, the water remaining between the water inlet end and the shut-off valve will not freeze when the water supply pipe has a frost protection effect. Therefore, by using the frost protection component of this application, all water leaking from the external part connected to the water supply pipe can be drained, effectively achieving faucet frost protection.

[0062] 3. The water shut-off valve is parallel to the axial direction of the main body, which allows the water shut-off valve to be directly closed at the end of the water inlet. This ensures that all or almost all of the water in the main body can be drained after the water shut-off valve is closed, ensuring that there is no water in the main body and effectively preventing freezing.

[0063] 4. The circumferential sealing structure is used to prevent water leakage from the gap between the second valve stem and the valve stem mounting hole. The venting structure is used to control the flow of water between the water passage and the outside. In the venting state, the water passage can pass through the circumferential sealing structure to connect with the outside, so that the air pressure inside and outside the tubular body is the same. At this time, the water can be smoothly discharged by opening the faucet. In the isolation state, the water passage is sealed to ensure smooth water flow.

[0064] 5. Two sets of vent holes are distributed along the axial direction of the second valve stem. The connecting channel opens up all the vent holes. By controlling all the vent holes to be located on the same side or opposite side of the circumferential sealing structure, the venting state and the isolation state can be switched.

[0065] 6. The transmission unit links the vent valve and the shut-off valve for control. Users only need to operate the control cap to achieve synchronous control of the vent valve and the shut-off valve. When the vent valve switches to the isolation state, the shut-off valve switches to the water flow state. When the vent valve switches to the venting state, the shut-off valve switches to the corresponding antifreeze state, improving the ease of operation. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of the overall structure of the present invention under water flow conditions (Example 1). Figure 2 yes Figure 1 A cross-sectional view along the axial direction; Figure 3 This is a schematic diagram of the overall structure under the antifreeze condition provided by this utility model (Example 1); Figure 4 yes Figure 3 A cross-sectional view along the axial direction; Figure 5 This is a structural schematic diagram of the tubular main body and tubular mounting platform provided by this utility model (Example 1). Figure 6 yes Figure 5 A cross-sectional view along the axial direction; Figure 7 This is an installation diagram of the first valve core, first valve stem, first spring, and valve stem bracket provided by this utility model (Example 1); Figure 8 This is a schematic diagram of the valve stem support provided by this utility model (Example 1). Figure 9 This is a schematic diagram of the structure of the second valve stem provided by this utility model (Example 1); Figure 10 yes Figure 9 A cross-sectional view along the axial direction; Figure 11 This is a connection diagram of the water supply pipeline, antifreeze components and faucet body provided by this utility model (Example 1); Figure 12 This is a schematic diagram of the sealing fit between the first valve core and the positioning step provided by this utility model (Example 2); Figure 13 This is a schematic diagram of the valve stem support provided by this utility model (Example 3). Figure 14 This is a cross-sectional view of the second valve stem along the axial direction provided by this utility model (Example 4); Figure 15 This is a cross-sectional schematic diagram of the cooperation between the transmission part and the first valve stem provided by this utility model (Example 5); Figure 16 This is a cross-sectional schematic diagram of the antifreeze state provided by this utility model (Example 6); Figure 17 This is a cross-sectional schematic diagram of the antifreeze state provided by this utility model (Example 7); Figure 18 This is a cross-sectional schematic diagram of the tubular body and vent valve provided by this utility model (Example 8).

[0067] In the diagram, the components are: 1. Tubular body; 2. Water passage; 3. Water supply pipe; 4. Inlet; 5. Outlet; 6. Shut-off valve; 7. Switch structure; 8. Vent valve; 9. Antifreeze component; 10. Positioning step; 11. Inlet; 12. First valve core; 13. First valve stem; 14. First sealing ring; 15. Inner sealing cone surface; 17. Elastic component; 18. First spring; 19. Spring abutment; 21. Valve stem bracket; 22. Guide plate; 23. Support leg; 24. Guide hole; 25. Hollow structure; 26. Tubular mounting platform; 27. Valve stem mounting hole; 28. Second valve stem; 29. ​​Circumferential sealing structure; 30. Vent structure; 31. Connecting channel. 32. Sealing plug; 34. Limiting rod; 35. Limiting groove; 36. Telescopic section; 37. Rotating section; 38. Second sealing ring; 39. Sealing ring groove; 40. Second spring; 41. Upper abutment part; 42. Lower abutment part; 43. Abutment boss; 44. Operating cap; 45. Lifting clearance; 46. Cap body; 47. Rotating ear; 48. Through hole; 49. Transmission part; 50. Conical transmission surface; 51. Small diameter end; 52. Large diameter end; 53. External thread; 54. Internal thread; 55. Faucet body; 56. Insulation body; 57. Lever; 58. Cable; 59. Cable through hole; 60. Valve core mounting hole; 61. Vent valve core; 62. Sealing shaft; 63. Detailed Implementation

[0068] 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.

[0069] Example 1 Specific implementation examples Figures 1-11 As shown, this faucet antifreeze component includes a tubular body 1, with a water passage 2 inside the tubular body 1. One end of the tubular body 1 is an inlet end 4 for connecting to a water supply pipe 3, and the other end is an outlet end 5 for connecting to or being integrated with the faucet. The inlet end 4 is equipped with a shut-off valve 6 parallel to the axial direction of the tubular body 1. The shut-off valve 6 can cut off or open the water passage 2 from the inlet end 4 under the control of the switch structure 7. A vent valve 8 is provided on the downstream side of the tubular body 1 at the inlet end 4, which can connect the water passage 2 to the outside atmosphere. The antifreeze component 9 includes an antifreeze state and a water-passing state. When the shut-off valve 6 is closed and the vent valve 8 is open, it is in the antifreeze state. When the shut-off valve 6 is open and the vent valve 8 is closed, it is in the water-passing state.

[0070] The antifreeze principle of this antifreeze component is a water-draining antifreeze. That is, after the water flow channel is closed, the faucet is opened to drain the water stored in the main body and the faucet. The vent valve 8 enables external air to communicate with the water passage 2. Under the action of atmospheric pressure and the gravity of the water stored in the faucet, the water stored in the tubular main body 1 and the faucet flows out along the faucet, thereby draining the water stored in the main body and the faucet and achieving antifreeze.

[0071] The water supply pipe 3 of an outdoor faucet is usually buried in the wall for frost protection. If it is not buried in the wall, it is covered with insulation cotton on the outside of the pipe body. The material is basically PPR pipe, which itself has a certain frost protection effect. Therefore, to achieve faucet frost protection, it is only necessary to ensure that the side after the water supply pipe 3 is frost-proof. The shut-off valve 6 of this application is set at the water inlet 4. The shut-off valve 6 directly cuts off the water flow from the water inlet 4, so that there is no water in the tubular body 1. Even if there is a certain space between the water inlet 4 and the shut-off valve 6 due to the installation space requirements of the shut-off valve 6, since the water inlet 4 is screwed into the water supply pipe 3, and the part of the water inlet 4 that connects to the tap water pipe is also covered in the water supply pipe 3, the water remaining between the water inlet 4 and the shut-off valve 6 will not freeze when the water supply pipe 3 has an frost protection effect. Therefore, by using the frost protection component of this application, all the water leaking out after the connection to the water supply pipe 3 can be drained, effectively achieving faucet frost protection.

[0072] like Figure 2 , 4As shown in Figures 5 and 6, a positioning step 10 is provided inside the tubular body 1 on one side of the water inlet end 4, and a water inlet 11 is formed within the positioning step 10. The shut-off valve 6 includes a first valve core 12 that can seal with the positioning step 10. The first valve core 12 is used to close and open the water inlet 11. A first valve stem 13 is provided on the side of the first valve core 12 away from the water inlet end 4. The first valve stem 13 passes through the water inlet 11, and its outer diameter is smaller than the inner diameter of the water inlet 11. The first valve stem 13 is connected to the switch structure 7.

[0073] Specifically, the positioning step 10 is a ring-shaped portion that extends circumferentially and protrudes radially inward. The water shut-off valve 6 can close the water inlet 11 to cut off the water flow, and it can also open the water inlet 11 to supply water to the faucet normally. The first valve core 12 and the first valve stem 13 form a T-shaped structure. The first valve core 12 is used to switch the water inlet 11. The outer diameter of the first valve stem 13 is smaller than that of the water inlet 11, so that a gap for water passage is formed between the first valve stem 13 and the water inlet 11. The first valve stem 13 positions the axial movement of the first valve core 12 on the one hand, and also has a transmission function between the first valve core 12 and the switching structure 7 on the other hand.

[0074] In this embodiment, the positioning step 10 is annular and has an inner sealing cone surface 15 with a large opening facing the water inlet end 4. The first valve core 12 includes a cylindrical outer wall, on which a first sealing ring 14 is fitted. The first sealing ring 14 is located on the side of the water inlet 11 near the water inlet end 4. The first sealing ring 14 is an O-ring and can seal against the inner sealing cone surface 15.

[0075] Specifically, the cross-section of the positioning step 10 is similar to a right trapezoid, with the acute angle of the right trapezoid pointing radially inward, the short base located on the upstream side, and the long waist corresponding to the inner sealing cone surface 15. The cross-section of the positioning step 10 is rectangular, and the first sealing ring 14 is fitted onto the groove on the outer wall of the first valve core 12.

[0076] Furthermore, the first sealing ring 14 and the first valve core 12 are located upstream of the water inlet 11. When the water inlet 11 is closed, the water pressure in the water supply pipe 3 can push the first valve core 12 toward the positioning step 10, which is equivalent to having a "self-locking" function to ensure the sealing effect. It is not necessary to apply a large external force to the first valve core 12 to ensure that it moves toward the positioning step 10. In other words, in fact, as long as a starting force is applied, the first valve core 12 can be moved toward the positioning step 10 to switch from the water-flowing state to the sealing state. The subsequent maintenance of the sealing state is achieved with the assistance of the water pressure in the water supply pipe 3.

[0077] like Figure 2 , 4As shown in Figures 7 and 8, an elastic component 17 is provided between the first valve stem 13 and the tubular body 1, which ensures that the first valve core 12 always tends to close the inlet 11. The elastic component 17 is a first spring 18. A valve stem support 21 for guiding the first valve stem 13 is provided on the side of the positioning step 10 away from the inlet end 4. The first valve stem 13 passes through the valve stem support 21, and the first spring 18 is located inside the valve stem support 21. The valve stem support 21 includes two parallel guide plates 22. Several support legs 23 extending along the thickness direction are connected between the opposite surfaces of the two guide plates 22. The first spring 18 is located between the two guide plates 22, with one end abutting against the spring abutment part 19 and the other end abutting against the guide plate 22 on the side of the positioning step 10, so that the first valve stem 13 has a tendency to move towards the outlet end 5. A guide hole 24 is provided through the axis of the guide plate 22, and the first valve stem 13 passes through the guide hole 24; the outer diameter of the guide plate 22 is adapted to the inner diameter of the water passage 2, and the guide plate 22 is also provided with a hollow structure 25 that runs through the thickness direction.

[0078] Specifically, the first spring 18 is sleeved on the first valve stem 13 and located on the side of the inlet 11 near the outlet 5, capable of applying an axial elastic force to the first valve stem 13 toward the outlet 5. The valve stem bracket 21 provides axial positioning for the first valve stem 13, allowing it to extend and retract axially along the axis of the water passage 2, ensuring the first valve core 12 and the inlet 11 remain coaxial and guaranteeing a sealing effect. Furthermore, the valve stem bracket 21 also provides a mounting position for the first spring 18. The valve stem support 21 can be composed of two parallel guide plates 22 and a support leg 23 connecting the guide plates 22, which is similar to a fully enclosed frame. One of the guide plates 22 abuts against the side of the positioning step 10 near the water outlet 5. The first spring 18 is located inside the valve stem support 21. One end abuts against the positioning step 10 through the guide plate 22, and the other end abuts against the spring abutment part 19 on the first valve stem 13, so that an elastic force is applied to the first valve stem 13 towards the water outlet 5. The spring abutment part 19 is specifically a plate-shaped part sleeved on the first valve stem 13. The side of the plate-shaped part away from the first spring 18 is connected to the abutment rod. The abutment rod is radially inserted into the first valve stem 13. The guide plate 22 is generally circular, with a guide hole 24 at the center for guiding and positioning the first valve stem 13. The middle part is provided with a hollow structure 25 to ensure smooth water flow. The outer diameter of the guide plate 22 is adapted to the inner diameter of the water passage 2 to ensure that the valve stem support 21 and the water passage 2 are arranged coaxially as much as possible.

[0079] like Figures 1-6 as well as Figure 9 , 10As shown, the vent valve 8 includes a tubular mounting platform 26 detachably fixed to the wall of the tubular body 1 by threads. A valve stem mounting hole 27 is axially formed within the tubular mounting platform 26. A second valve stem 28 is provided in the valve stem mounting hole 27. A circumferential sealing structure 29 is provided between the second valve stem 28 and the valve stem mounting hole 27. A venting structure 30 is provided on the second valve stem 28. By axially extending and retracting the second valve stem 28, the venting structure 30 can be switched between a venting state connecting the water passage 2 to the outside atmosphere and an isolation state cutting off the connection between the water passage 2 and the outside atmosphere. The venting structure 30 includes two vent holes 31 provided on the second valve stem 28, which are connected by a connecting channel 32. In the venting state, the vent holes 31 are distributed on the inner and outer sides of the circumferential sealing structure 29. In the isolation state, the vent holes 31 are located on the same side of the circumferential sealing structure 29.

[0080] Specifically, the tubular mounting platform 26 is radially extended on the tubular body 1. The tubular body 1 can be detachably installed via threads. Its axially penetrating valve stem mounting hole 27 is connected to the water passage 2. The second valve stem 28 is disposed in the valve stem mounting hole 27. The circumferential sealing structure 29 is used to prevent water leakage between the second valve stem 28 and the valve stem mounting hole 27. The venting structure 30 is used to control the flow of water through the water passage 2 and the outside. In the venting state, the water passage 2 can pass through the circumferential sealing structure 29 and connect with the outside, so that the air pressure inside and outside the tubular body 1 is the same. At this time, the water can be smoothly discharged by opening the faucet. In the isolation state, the sealing of the water passage 2 is guaranteed to ensure smooth water flow. Two sets of vent holes 31 are distributed along the axial direction of the second valve stem 28. The connecting channel 32 opens up each vent hole 31. By controlling all vent holes 31 to be located on the same side or opposite side of the circumferential sealing structure 29, the venting state and the isolation state can be switched. In the isolation state, all vent holes 31 are located on the inner side, which can prevent external dust from blocking the vent holes 31 or the connecting channel 32.

[0081] In this embodiment, the connecting channel 32 is axially opened as a blind hole from the upper end of the second valve stem 28. Two vent holes 31 are both located on the sidewalls of the second valve stem 28 at different axial positions. A sealing plug 34 is provided in the connecting channel 32 on the side of the vent hole 31 away from the water passage 2. A radially extending limiting rod 35 is provided on the second valve stem 28, and a radially extending limiting groove 36 is provided on the side of the tubular mounting platform 26. The limiting rod 35 slides within the limiting groove 36. The limiting groove 36 includes an axially extending telescopic section 37 and a circumferentially extending rotating section 38. The rotating section 38 is L-shaped and located at the lower end of the telescopic section 37. The limiting rod 35 blocks the sealing plug 34 on the side away from the water passage 2.

[0082] Specifically, to prevent water leakage at the upper end of the connecting channel 32, a sealing plug 34 is provided inside the connecting channel 32 on the side of the vent 31 away from the water passage 2. The sealing plug 34 is made of elastic material and can seal with the connecting channel 32. The second valve stem 28 can extend, retract, or rotate within the valve stem mounting hole 27. To limit the extension, retraction, and rotation positions, the limiting rod 35 on the second valve stem 28 slides in the J-shaped limiting groove 36 of the tubular mounting platform 26. The extension section 37 is used to guide the extension and retraction of the second valve stem 28, and the rotation section 38 is used to rotate after the second valve stem 28 has extended or retracted to achieve extension and retraction limitation.

[0083] like Figure 2 , 4 As shown in Figure 6, a second spring 41 is provided in the valve stem mounting hole 27 and sleeved on the second valve stem 28. The two ends of the second spring 41 abut against the upper abutment portion 42 on the second valve stem 28 and the lower abutment portion 43 in the valve stem mounting hole 27, respectively. The upper abutment portion 42 is a limiting rod 35 extending radially on the second valve stem 28, and the lower abutment portion 43 is an abutment boss 44 protruding radially on the inner wall of the valve stem mounting hole 27. The circumferential sealing structure 29 includes a second sealing ring 39. A sealing ring groove 40 is provided on the radially inner side of the abutment boss 44. The second sealing ring 39 is engaged in the sealing ring groove 40 and its inner side is sealed with the second valve stem 28.

[0084] Specifically, the second spring 41 applies an outward elastic tendency to the second valve stem 28, which keeps it at the uppermost end of the telescopic section 37 and also keeps it within the rotating section 38 after the limiting rod 35 rotates into it. The front end of the rotating section 38 is bent upward to prevent the limiting rod 35 from sliding out of the rotating section 38. The limiting rod 35 is preferably inserted through the second valve stem 28. The limiting groove 36 is provided with two sets of centrally symmetrical grooves, which respectively cooperate with the two ends of the limiting rod 35. In the scheme where a sealing plug 34 is provided in the connecting channel 32, the middle part of the limiting rod 35 passes through the connecting channel 32, and the sealing plug 34 is located below the limiting rod 35 and can be limited downward by the limiting rod 35 to prevent the sealing plug 34 from coming out of the upper end of the connecting channel 32. The sealing ring groove 40 is provided on the abutment boss 44, and the inner and outer rings of the second sealing ring 39 are always in contact with the outer wall of the second valve stem 28 and the inner wall of the valve stem mounting hole 27 to ensure circumferential sealing and sliding sealing.

[0085] like Figures 1-4 As shown, an operating cap 45 is fixed to the upper end of the second valve stem 28. A lifting gap 46 is provided between the inner top surface of the operating cap 45 and the top surface of the tubular mounting platform 26. The operating cap 45 includes a cap body 47 with a U-shaped cross-section and a rotating ear 48 that extends radially on the cap body 47. The cap body 47 is fitted onto the upper end of the tubular mounting platform 26. A through hole 49 that is axially connected to the second valve stem 28 is provided through the cap body 47.

[0086] Specifically, the control cap 45 is used by the user to rotate or insert the second valve stem 28. Its main body is a U-shaped cap body 47 with an opening slightly larger than the outer wall of the valve stem mounting platform 26. The through hole 49 on the cap body 47 can be used to insert a bolt. The lower end of the bolt is connected to the top of the second valve stem 28 to fix the control cap 45 and the second valve stem 28. Moreover, there is a gap between the inner top surface of the cap body 47 and the top of the tubular mounting platform 26 for the lifting and lowering action of the control cap 45 connected to the second valve stem 28.

[0087] like Figure 2 , 4 As shown in Figures 9 and 10, the switch structure 7 includes a transmission part 50 disposed at the lower end of the second valve stem 28 of the vent valve 8. The transmission part 50 is in contact with the inner end of the first valve stem 13 of the shut-off valve 6, and can convert the extension and retraction of the second valve stem 28 into the axial extension and retraction of the first valve stem 13. The transmission part 50 is tapered, and the inner end of the first valve stem 13 slides in contact with the tapered transmission surface 51 of the transmission part 50. In the antifreeze state, the inner end of the first valve stem 13 is close to the small diameter end 52, and in the water-flow state, the inner end of the first valve stem 13 is close to the large diameter end 53.

[0088] Specifically, the transmission unit 50 is located at the lower end of the second valve stem 28, and can control the axial extension and retraction of the first valve stem 13 by moving the second valve stem 28. Furthermore, the transmission unit 50 also links the vent valve 8 and the water shut-off valve 6 for coordinated control. The user only needs to operate the control cap 45 to achieve synchronous control of the vent valve 8 and the water shut-off valve 6. When the vent valve 8 switches to the isolation state, the water shut-off valve 6 switches to the water-flow state; when the vent valve 8 switches to the venting state, the water shut-off valve 6 switches to the corresponding anti-freeze state, improving operational convenience. The axial change of the outer diameter of the transmission unit 50, by controlling the axial extension and retraction of the second valve stem 28, ensures that the inner end of the first valve stem 13 is always in contact with the transmission unit 50 under the elastic force of the first spring 18, but the outer diameter of the contact position differs, thus achieving the effect of controlling the axial extension and retraction of the first valve stem 13.

[0089] like Figure 11 As shown, the antifreeze faucet in this embodiment includes a faucet body 56. The water inlet 4 of the faucet body 56 is provided with the aforementioned antifreeze component 9. The tubular body 1 of the antifreeze component 9 has a hexagonal cross-section and is provided with an external thread 54 at the water inlet 4 and an internal thread 55 at the water outlet 5. The water outlet 5 is threadedly connected to the faucet inlet of the faucet body 56. During installation, the water supply pipe 3 and the water inlet 4 of the tubular body 1 are embedded in the wall.

[0090] Specifically, the antifreeze faucet consists of a faucet body 56 and an antifreeze component 9, which are two independent parts. The antifreeze component 9 can be adapted to the faucet body 56 with a national standard connector. As a conventional implementation method, and in order to meet the antifreeze requirements, the water supply pipe 3 and the water inlet end 4 of the tubular body 1 are insulated by the heat insulation body 57. This part itself will not or is generally not easy to freeze. The faucet body 56 and the antifreeze component 9 downstream of the water inlet end 4 can achieve the antifreeze effect by adjusting to the corresponding antifreeze state, which is especially suitable for outdoor use in cold regions.

[0091] Specific working principle: Taking the installation on an outdoor wall as an example, after installation, the water supply pipe is buried in the wall, the inlet end 4 of the tubular body 1 is screwed into the pipe opening of the water supply pipe 3, and the faucet body 56 is screwed onto the outlet end 5 of the tubular body 1.

[0092] Under normal water usage conditions, the first valve stem 13 is in a retracted state, and the limiting rod 35 is located in the rotating section 38 of the limiting groove 36. At this time, the end of the first valve stem 13 is in contact with the large diameter end 53 of the transmission part 50, the first sealing ring 14 is away from the positioning step 10, and the switch port connects the tubular body 1 and the water supply pipe 3. At the same time, both vent holes 31 are located on the same side of the second sealing ring 39 (the side closer to the water passage 2). At this time, the faucet body 56 can be turned on for normal water use.

[0093] When antifreeze is required, rotate the control cap 45, and the limit rod 35 leaves the rotating section 38 and enters the telescopic section 37. Under the elastic force of the second spring 41, the second valve rod 28 extends upward until the limit rod 35 stops and remains at the top of the telescopic section 37. At this time, the end of the first valve rod 13 contacts the small diameter end 52 of the transmission part 50, and the first sealing ring 14 is in contact with the inner sealing cone surface 15, closing the switch port from the upstream side. At the same time, the two vent holes 31 are located on the upper and lower sides of the first sealing ring 14, respectively. The water passage 2 is connected to the upper vent hole 31 through the lower vent hole 31 and the connecting channel 32. The upper vent hole 31 is connected to the outside through the gap between the second valve rod 28 and the valve rod mounting hole 27, the limit groove 36, and the gap between the control cap 45 and the tubular mounting platform 26. That is, the water passage 2 is connected to the outside atmosphere. This means that when the switch of the faucet body 56 is turned on to the water discharge state, the water stored in the tubular body 1 and the faucet body 56 will be automatically discharged. Since there is no water inside, it naturally has an antifreeze effect.

[0094] Example 2 The working principle of this embodiment is basically the same as that of embodiment 1, except that the sealing fit between the first valve core 12 and the positioning step 10 is different.

[0095] Specific implementation examples Figure 12As shown, the outer diameter of the first valve core 12 is larger than the inner diameter of the positioning step 10. The first valve core 12 has a first sealing ring 14 embedded on one end face near the rod body. The first sealing ring 14 can seal against the inner end face of the positioning step 10.

[0096] Specifically, the cross-sections of the positioning step 10 and the first valve core 12 are both rectangular. The outer diameter of the first valve core 12 is larger than that of the inlet 11, meaning that its axial projection can completely cover the inlet 11. The first sealing ring 14 of this scheme is set on the first valve core 12. When the inlet 11 is closed, the first valve core 12 is axially pressed against the positioning step 10 to achieve a sealing fit.

[0097] Example 3 The working principle of this embodiment is basically the same as that of embodiment 1, except that the valve stem support 21 is different.

[0098] Specific implementation examples Figure 13 As shown, the valve stem support 21 includes a guide plate 22. Three support legs 23 extending along the thickness direction are provided on one side of the guide plate 22. The support legs 23 abut against the back of the positioning step 10. The outer end of the guide plate 22 is pressed against the inner wall of the tubular body 1 after being tightened by an open spring. One end of the first spring 18 abuts against the back of the positioning step 10, and the other end abuts against the spring abutment part 19.

[0099] Specifically, the valve stem support 21 consists of a guide plate 22 and several support legs 23 vertically connected to the guide plate 22, which is similar to a semi-enclosed frame. The first spring 18 is located between the positioning step 10 and the valve stem support 21. The support legs 23 are mainly used to keep the guide plate 22 perpendicular to the water passage 2 and can be detachably fixed in the water passage 2 by means of an open spring.

[0100] Example 4 The working principle of this embodiment is basically the same as that of embodiment 1, except that the connection channel 32 is different.

[0101] Specific implementation examples Figure 14 As shown, the connecting channel 32 is opened axially from the bottom of the second valve stem 28 in a blind hole manner. One of the vent holes 31 is provided on the side wall of the second valve stem 28, and the other vent hole 31 is the lower end inlet of the connecting channel 32. In this case, the sealing plug 34 can be omitted.

[0102] Example 5 The working principle of this embodiment is basically the same as that of embodiment 1, except that the transmission part 50 is different.

[0103] Specific implementation examples Figure 15As shown, the switch structure 7 includes a transmission part 50 disposed at the lower end of the second valve stem 28 of the vent valve 8. The transmission part 50 is in contact with the inner end of the first valve stem 13 of the shut-off valve 6, and can convert the rotational action of the second valve stem 28 into the axial extension and retraction action of the first valve stem 13. The transmission part 50 is cam-shaped, and the inner end of the first valve stem 13 slides in contact with the cylindrical outer wall of the transmission part 50. In the antifreeze state, the inner end of the first valve stem 13 is close to the thick wall of the transmission part 50, and in the water-flow state, the inner end of the first valve stem 13 is close to the thin wall of the transmission part 50.

[0104] Specifically, the transmission part 50 is located at the lower end of the second valve stem 28 and can control the axial extension and retraction of the first valve stem 13 by the passage of the second valve stem 28. The transmission part 50 is elliptical in shape, and the extension and retraction control of the first valve stem 13 can be achieved by rotating the second valve stem 28. The axial length of the transmission part 50 should be greater than the extension and retraction distance of the second valve stem 28 to ensure that the first valve stem 13 never disengages from the transmission part 50.

[0105] Specific working principle: When switching the state of the first valve core 12, the second valve rod 28 needs to be rotated by the control cap 45. The rear end of the first valve rod 13 is in contact with the position of different thickness on the transmission part 50 to realize the extension and retraction control of the first valve rod 13.

[0106] Example 6 The working principle of this embodiment is basically the same as that of embodiment 1, except that the switch structure 7 is different.

[0107] Specific implementation examples Figure 16 As shown, the switch structure 7 includes a lever 58 rotatably connected to the outside of the tubular body 1. The rotating end of the lever 58 is connected to the end of the first valve stem 13 of the water shut-off valve 6 via a cable 59. The cable 59 passes through a cable through hole 60 on the tubular body 1, and there is a circumferential seal between the cable through hole 60 and the cable 59. The cable 59 is a flexible cable, and the cable body extends and retracts in the cable through hole 60. Specifically, in this embodiment, the switch structure 59 is completely independent of the vent valve 8. Since the first valve stem 13 is positioned axially by the valve stem support 21, the flexible cable 59 can pull the first valve stem 13 with a force forming an acute angle with its axial direction. The radial component of the force cancels out the wall support force of the tubular body 1, while the axial component is used to specifically pull the first valve stem 13 downstream. The flexible cable 59 is specifically a thin, bendable iron wire. To prevent leakage, the extension portion of the cable 59 in the cable passage 60 is replaced by a rigid sealing slider, which circumferentially seals the cable passage 60.

[0108] Specific working principle: When it is necessary to close the shut-off valve 6, the lever 58 is moved and the cable 59 pulls the first valve stem 13 to extend downstream. The first valve core 12 and the positioning step 10 achieve a sealing fit, thus closing the inlet 11.

[0109] Example 7 The working principle of this embodiment is basically the same as that of embodiment 6, except that the switch structure 7 is different.

[0110] Specific implementation examples Figure 17 As shown, the cable 59 is a rigid cable with two hinged ends. One rigid cable rotates in the cable through hole 60 through the sealing shaft 63 and its outer end is connected to the lever 58. The other rigid cable is located in the water passage 2 and its inner end is hinged to the end of the first valve stem 13.

[0111] Specifically, the cable 59 in this embodiment consists of two rigid cables, which are straight rods that do not bend or deform. One rigid cable passes through the cable through hole 60 and is rotatably connected to a radially extending sealing shaft 63 in the cable through hole 60. The sealing shaft 63 is slidably sealed with the inner wall of the cable through hole 60. The lever 58 controls the swing of the rigid cable. The other rigid cable is located in the water passage 2 and converts the swing action into the extension and retraction action of the first valve stem 13. In order to ensure the swing space of the rigid cable, flared relief grooves are provided at both ends of the cable through hole 60.

[0112] Specific working principle: When it is necessary to close the shut-off valve 6, the lever 58 is moved, and the rigid cable passing through the wall of the tubular body 1 rotates around the sealing shaft 63. The rigid cable connected to the inner end of the rigid cable pulls the first valve stem 13 to extend downstream, and the first valve core 12 and the positioning step 10 achieve a sealing fit, thus closing the inlet 11.

[0113] Example 8 The working principle of this embodiment is basically the same as that of embodiment 1, except for the vent valve.

[0114] Specific implementation examples Figure 18 As shown, the vent valve 8 includes a valve core mounting hole 61 provided on the wall of the tubular body 1. A vent valve core 62 is provided in the valve core mounting hole 61. The valve core mounting hole 61 is connected to the water channel 2 and the outside atmosphere. The vent valve core 62 is actually similar to the valve core on a tire and can control the opening and closing of the valve core mounting hole 61.

[0115] Specific working principle: When it is necessary to open the vent valve 8, simply press the vent valve core 62. After releasing, the vent valve core 62 extends and resets, switching back to the closed state of the valve core mounting hole 61 and maintaining it normally.

[0116] 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 faucet antifreeze component, comprising a tubular body (1), wherein the tubular body (1) is provided with a water passage (2), characterized in that, One end of the tubular body (1) is an inlet end (4) for connecting to the water supply pipe (3), and the other end is an outlet end (5) for connecting to the faucet or integrated with the faucet. The inlet end (4) is equipped with a shut-off valve (6). The shut-off valve (6) can cut off or open the water passage (2) from the inlet end (4) under the control of the switch structure (7). A vent valve (8) is provided on the downstream side of the tubular body (1) at the inlet end (4), which can connect the water passage (2) to the outside atmosphere. The antifreeze component (9) includes an antifreeze state and a water-passing state. When the water shut-off valve (6) is closed and the air vent valve (8) is open, it is in the antifreeze state. When the water shut-off valve (6) is open and the air vent valve (8) is closed, it is in the water-passing state.

2. The faucet antifreeze component according to claim 1, characterized in that, The shut-off valve (6) is set at the inlet end (4) in the axial direction parallel to the tubular body (1).

3. The faucet antifreeze component according to claim 2, characterized in that, The tubular body (1) has a positioning step (10) on one side of the water inlet end (4), and the positioning step (10) forms a water inlet (11). The water shut-off valve (6) includes a first valve core (12) that can be sealed and fitted with the positioning step (10). The first valve core (12) is used to close and open the water inlet (11).

4. The faucet antifreeze component according to claim 3, characterized in that, The first valve core has a first valve stem (13) on the side away from the water inlet (4). The first valve stem (13) passes through the water inlet (11) and its outer diameter is smaller than the inner diameter of the water inlet (11). The first valve stem (13) is connected to the switch structure (7).

5. The faucet antifreeze component according to claim 3, characterized in that, The positioning step (10) is annular, and the first valve core (12) includes an outer wall in the shape of a column or a cone. A first sealing ring (14) is fitted on the outer wall. The first sealing ring (14) can seal against the inner periphery of the inner end face of the positioning step (10). Alternatively, the positioning step (10) has an inner sealing cone surface (15) with a large opening facing the water inlet end (4). The first sealing ring (14) can seal against the inner sealing cone surface (15). Alternatively, the outer diameter of the first valve core (12) is larger than the inner diameter of the positioning step (10), and the first valve core (12) is provided with a first sealing ring (14) on one end face near the rod body. The first sealing ring (14) can seal against the inner end face of the positioning step (10). The first sealing ring (14) is located on the side of the inlet (11) near the inlet end (4).

6. The faucet antifreeze component according to claim 4, characterized in that, An elastic component (17) is provided between the first valve stem (13) and the tubular body (1) to make the first valve core (12) always tend to close the inlet (11).

7. The faucet antifreeze component according to claim 6, characterized in that, The elastic component is a first spring (18), one end of which directly or indirectly abuts against the back of the positioning step (10) away from the water inlet end (4), and the other end abuts against the spring abutment part (19) on the first valve stem (13).

8. The faucet antifreeze component according to claim 7, characterized in that, The positioning step (10) is provided with a valve stem bracket (21) on the side away from the water inlet end (4) for guiding the first valve stem (13). The first valve stem (13) passes through the valve stem bracket (21), and the first spring (18) is located inside the valve stem bracket (21).

9. The faucet antifreeze component according to claim 8, characterized in that, The valve stem bracket (21) includes a guide plate (22), and the guide plate (22) has at least three support legs (23) extending along the thickness direction on one side. The support legs (23) abut against the back of the positioning step (10). One end of the first spring (18) abuts against the back of the positioning step (10), and the other end abuts against the spring abutment part (19). Alternatively, the valve stem support (21) includes two parallel guide plates (22), and a plurality of support legs (23) extending in the thickness direction are connected between the opposite surfaces of the two guide plates (22). The first spring (18) is located between the two guide plates (22), with one end abutting against the spring abutting part (19) and the other end abutting against the guide plate (22) on the side of the positioning step (10). The first spring (18) causes the first valve stem (13) to tend to move toward the outlet end (5).

10. The faucet antifreeze component according to claim 9, characterized in that, The guide plate (22) has a guide hole (24) through its axis, the first valve stem (13) passes through the guide hole (24), and the outer end of the valve stem bracket (21) is pressed against the inner wall of the tubular body (1) after being tightened by an open spring. The outer diameter of the guide plate (22) is adapted to the inner diameter of the water passage (2), and the guide plate (22) is also provided with a hollow structure (25) that runs through the thickness direction.

11. The faucet antifreeze component according to claim 1, characterized in that, The vent valve (8) includes a tubular mounting platform (26) integrally or detachably fixed to the wall of the tubular body (1). A valve stem mounting hole (27) is formed axially through the tubular mounting platform (26). A second valve stem (28) is provided in the valve stem mounting hole (27). A circumferential sealing structure (29) is provided between the second valve stem (28) and the valve stem mounting hole (27). A venting structure (30) is provided on the second valve stem (28). By rotating the second valve stem (28) circumferentially and / or extending and retracting the second valve stem (28), the venting structure (30) can be controlled to switch between a venting state that connects the water passage (2) and the outside atmosphere, and an isolation state that cuts off the connection between the water passage (2) and the outside atmosphere.

12. The faucet antifreeze component according to claim 11, characterized in that, The ventilation structure (30) includes at least two ventilation holes (31) disposed on the second valve stem (28). The ventilation holes (31) are connected by a connecting channel (32). In the ventilation state, the ventilation holes (31) are distributed on the inner and outer sides of the circumferential sealing structure (29). In the isolation state, the ventilation holes (31) are located on the same side of the circumferential sealing structure (29).

13. The faucet antifreeze component according to claim 12, characterized in that, The connecting channel (32) is axially penetrating or blind-hole type from the upper end of the second valve stem (28). One vent hole (31) is provided on the side wall of the second valve stem (28), and the other vent hole (31) is provided on the side wall of the second valve stem or the bottom of the second valve stem (28). A sealing plug (34) is provided in the connecting channel (32) on the side of the vent hole (31) away from the water passage (2). Alternatively, the connecting channel (32) is axially opened as a blind hole from the bottom of the second valve stem (28), with one vent (31) located on the side wall of the second valve stem (28) and the other vent (31) being the lower inlet of the connecting channel (32).

14. The faucet antifreeze component according to claim 11, characterized in that, The second valve stem (28) is provided with a radially extending limiting rod (35), and the tubular mounting platform (26) is provided with a radially extending limiting groove (36) on its side. The limiting rod (35) slides in the limiting groove (36). The limiting groove (36) includes an axially extending telescopic section (37) and a circumferentially extending rotating section (38). The rotating section (38) is an upwardly inclined straight line or an arc or a broken line shape with its front end bent toward the telescopic section (37). The rod of the limiting rod (35) can abut against the top surface of the sealing plug (34) in the connecting channel (32) to limit the sealing plug (34) axially.

15. The faucet antifreeze component according to claim 11, characterized in that, The circumferential sealing structure (29) includes a second sealing ring (39), and a sealing ring groove (40) is provided in the valve stem mounting hole (27). The second sealing ring (39) is fitted in the sealing ring groove (40) and its inner side is sealed to the second valve stem (28). Alternatively, the second valve stem (28) may have a sealing ring groove (40) on its body, and the second sealing ring (39) may be fitted inside the sealing ring groove (40) and have a sealing fit with the inner wall of the valve stem mounting hole (27) on its outer side.

16. The faucet antifreeze component according to claim 11, characterized in that, The valve stem mounting hole (27) is provided with a second spring (41) sleeved on the second valve stem (28). The two ends of the second spring (41) abut against the upper abutment part (42) on the second valve stem (28) and the lower abutment part (43) in the valve stem mounting hole (27), respectively. The upper abutment part (42) is a limiting rod (35) extending radially on the second valve stem (28), and the lower abutment part (43) is an abutment boss (44) protruding radially on the inner wall of the valve stem mounting hole (27).

17. The faucet antifreeze component according to claim 11, characterized in that, The upper end of the second valve stem (28) is fixed with an operating cap (45), and a lifting gap (46) is provided between the inner top surface of the operating cap (45) and the top surface of the tubular mounting platform (26). The control cap (45) includes a cap body (47) with a U-shaped cross-section and a rotating ear (48) extending radially on the cap body (47). The cap body (47) is fitted onto the upper end of the tubular mounting platform. A through hole (49) axially communicating with the second valve stem (28) is provided through the cap body (47).

18. The faucet antifreeze component according to any one of claims 1-17, characterized in that, The switch structure (7) includes a transmission part (50) disposed at the lower end of the second valve stem (28) of the vent valve (8). The transmission part (50) is in contact with the inner end of the first valve stem (13) of the shut-off valve (6) and can convert the rotation and / or extension and retraction of the second valve stem (28) into the axial extension and retraction of the first valve stem (13).

19. The faucet antifreeze component according to claim 18, characterized in that, The transmission part (50) is conical, and the inner end of the first valve stem (13) slides in contact with the conical transmission surface (51) of the transmission part (50). In the antifreeze state, the inner end of the first valve stem (13) is close to the small diameter end (52), and in the water-passing state, the inner end of the first valve stem (13) is close to the large diameter end (53). Alternatively, the transmission part (50) is in the shape of a cam column, and the inner end of the first valve stem (13) slides in contact with the outer cylindrical wall of the transmission part (50). In the antifreeze state, the inner end of the first valve stem (13) is close to the thick wall of the transmission part (50), and in the water-passing state, the inner end of the first valve stem (13) is close to the thin wall of the transmission part (50).

20. The faucet antifreeze component according to any one of claims 1-10, characterized in that, The vent valve (8) includes a valve core mounting hole (61) provided on the wall of the tubular body (1), and a vent valve core (62) is provided in the valve core mounting hole (61). The valve core mounting hole (61) is connected to the water channel (2) and the outside atmosphere. The vent valve core (62) can control the opening and closing of the valve core mounting hole (61).

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