Anti-freezing faucet

Abstract

The invention provides an anti-freezing faucet, and belongs to the technical field of faucets. The problems that the anti-freezing operation is inconvenient and the anti-freezing stability is poor are solved. The anti-freezing faucet comprises a valve body with a water inlet and a water outlet and a control rod which is in threaded connection with the valve body, the lower end of the control rod is located in the valve body, and the control rod can move along the center line of the control rod when rotating and control connection or disconnection of the water inlet and the water outlet. A second sealing ring abutting against the inner wall of the valve body is arranged on the peripheral side of the lower end of the control rod, the second sealing ring is located between the air inlet and the water outlet, and when the control rod controls the water inlet and the water outlet to be blocked, the second sealing ring is separated from the inner wall of the valve body and enables the air inlet and the water outlet to be communicated. The device has the advantages of good anti-freezing stability, convenience in operation and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of faucets and relates to an antifreeze faucet. Background Art

[0002] At present, more and more houses (especially in developed countries) have their own gardens, so that people can grow flowers or vegetables in the gardens. Therefore, it is necessary to install faucets in the gardens and connect water pipes for use, so as to facilitate people to water a large area. When the faucet is turned off, water often remains in the water pipes and faucets. In this case, in winter when the temperature is low or in some areas with cold weather all year round, it is easy for the faucet or water pipe to freeze and become unusable due to the residual water.

[0003] To this end, the applicant has proposed an automatic drainage joint with patent application number 201811036062.2, which includes a main body with an upper end as a water inlet end and a lower end as a water outlet end. A ring-shaped sealing gasket and a baffle with a cross-section smaller than the sealing gasket are provided in the water inlet end. The baffle rests on the sealing gasket and closes the opening on the center hole of the sealing gasket. An air inlet hole connected to the water outlet end is provided on the outside of the main body. When water enters, the sealing gasket can be deformed downward and close the air inlet hole. A ferrule is slidably connected in the water outlet end, and an elastic support member is connected to the ferrule. There is a gap between the upper end of the support member and the lower end face of the sealing gasket. After the ferrule moves upward, the upper end of the support member can be pressed against the sealing gasket. After the faucet is closed, water remains in the faucet and the water pipe, and the sealing gasket and the support member both rely on their own elastic force to reset upward at the same time, and the upper end of the support member is again pressed against the lower end surface of the sealing gasket, and the remaining water in the faucet enters the water inlet end of the main body. However, the force exerted by the accumulated water on the sealing gasket is smaller than the elastic force of the sealing gasket itself plus the elastic force of the support member on the sealing gasket. Therefore, the accumulated water is isolated in the water inlet end, and because the air inlet hole is opened, outside air can enter the water pipe along the water outlet end, thereby discharging the water remaining in the water pipe under the action of air pressure to prevent the inside of the water pipe from freezing due to the accumulated water. After the residual water in the water pipe is drained, the water pipe is removed from the water outlet end of the main body. At this time, the ferrule loses the constraint of the water pipe and moves downward. As a result, the support member moves downward so that there is a gap between its upper end and the lower end surface of the sealing gasket. The pressure exerted on the sealing gasket by the water accumulated inside the faucet isolated in the water inlet end is greater than the elastic force of the sealing gasket itself, so that the upper port of the center hole of the sealing gasket is opened again, so that the water accumulated inside the faucet is discharged to the outside to prevent the faucet from freezing.

[0004] However, it also has its shortcomings: the faucet antifreeze can only be achieved after the water pipe is removed from the main body of the automatic drainage joint. Then the water pipe needs to be connected again when it is used again next time, which is inconvenient to operate. In addition, the firmness of the connection between the automatic drainage joint and the faucet will also affect the stability of antifreeze. If the connection between the automatic drainage joint and the faucet becomes loose during use, the antifreeze function may fail. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose an antifreeze faucet, which solves the problems of inconvenient antifreeze operation and poor antifreeze stability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] An antifreeze faucet comprises a valve body with a water inlet and a water outlet, and a control rod threadedly connected to the valve body and with its lower end located in the valve body. When the control rod is rotated, it can move along its own center line and control the connection or blocking of the water inlet and the water outlet. It is characterized in that an air inlet hole is provided on the outer side of the valve body, and a second sealing ring abutting against the inner wall of the valve body is provided on the outer peripheral side of the lower end of the control rod. The second sealing ring is located between the air inlet and the water outlet. When the control rod controls the water inlet and the water outlet to be blocked, the second sealing ring is separated from the inner wall of the valve body and connects the air inlet and the water outlet.

[0008] Under normal conditions, the control rod is in a state of connecting the water inlet and the water outlet. At this time, the second sealing ring abuts against the inner wall of the valve body to form a seal and blocks the air inlet and the water outlet. At this time, water can flow from the water inlet into the water outlet, but the external air cannot flow into the water outlet through the air inlet, and the water flowing into the valve body from the water inlet will not flow out from the air inlet. Since the water is always flowing, there will be no freezing in the water pipe connected to the outside of the water outlet. When the user turns the control rod to move along its own center line in the direction that can control the blocking of the water inlet and the water outlet, the second sealing ring will move with it because it is set on the outside of the control rod. When the control rod moves along its own center line to block the water inlet and the water outlet, that is, the antifreeze faucet is in a closed state, the second sealing ring is separated from the inner wall of the valve body and the air inlet and the water outlet are connected. At this time, water will no longer flow into the valve body from the water inlet (the purpose of blocking the water inlet is to ensure that the water will not flow out directly from the air inlet), and the outside air enters the water outlet through the air inlet, and then the water remaining in the water outlet and the water remaining in the water pipe are discharged under the action of air pressure to prevent water accumulation and freezing.

[0009] Through the above arrangement, the antifreeze faucet can discharge the water remaining in the water outlet and the water remaining in the water pipe when it is closed without the help of the connection of the drainage joint to prevent freezing, thereby preventing the phenomenon of poor antifreeze effect or failure of the antifreeze function caused by factors such as loose connection of the drainage joint, thereby improving the stability of antifreeze. Moreover, the antifreeze of the faucet and the water pipe can be achieved by simply turning the control lever, without the need to disassemble the water pipe, etc., so the operation is also more convenient.

[0010] In the above-mentioned antifreeze faucet, the inner wall of the valve body is provided with an annular air guide groove at the threaded connection between the valve body and the control rod, the number of air inlet holes is several and each air inlet hole is connected to the annular air guide groove, and the outer peripheral side of the control rod located in the valve body is provided with a plurality of strip-shaped air grooves arranged along the axial direction of the control rod, and the second sealing ring is located below each air groove.

[0011] When the second sealing ring is separated from the inner wall of the valve body, the upper part of each air passage groove is located at the position of the annular air guide groove, and the lower part of each air passage groove is connected to the water outlet. External air first enters the annular air guide groove from each air inlet, and then finally enters the water outlet through each air passage groove and discharges the water remaining in the water outlet and the water remaining in the water pipe under the action of air pressure. Because the control rod rotates while moving along its own axis to control the water inlet and the water outlet from the connected state to the blocked state, the setting of the annular air guide groove and each air passage groove can ensure that the outside air can always stably enter the water outlet to perform the antifreeze function.

[0012] In the above-mentioned antifreeze faucet, the air inlet hole is a blind hole, the opening of the air inlet hole is arranged downward, and the annular air guide groove is laterally connected to the air inlet hole.

[0013] Through the above arrangement, it can be ensured that rainwater will not enter the valve body through the air inlet, which also ensures that the outside air can stably enter the water outlet to perform the antifreeze function.

[0014] In the above-mentioned antifreeze faucet, the valve body is provided with a water flow cavity, the upper end of the valve body is provided with a threaded connection hole for threaded connection of a control rod and a sealing matching hole which is concentrically arranged with the threaded connection hole and is a smooth hole, the annular air guide groove is located on the inner side of the threaded connection hole, the sealing matching hole is connected with the water flow cavity, the aperture of the sealing matching hole is larger than that of the threaded connection hole, the outer peripheral side of the lower end of the control rod is provided with a boss which can form a clearance fit with the sealing matching hole, the outer peripheral side of the boss is provided with an installation groove, and the second sealing ring is arranged in the installation groove.

[0015] When the antifreeze faucet is in a normal water flow state, the convex shoulder is located in the sealing matching hole and the second sealing ring abuts against the hole wall of the sealing matching hole to form a seal, thereby blocking the connection between the air inlet and the water flow cavity. Turn the control rod to move it downward, and when the second sealing ring separates from the hole wall of the sealing matching hole, the lower end notch of the air flow groove is connected to the air flow cavity, so that the outside air can enter the water flow cavity through the air inlet, the annular air guide groove and the air flow groove in sequence, and then finally enter the water outlet from the water flow cavity to achieve the antifreeze function.

[0016] In the above-mentioned antifreeze faucet, the air passage portion is opened to the convex shoulder above the second sealing ring.

[0017] Because the convex shoulder and the sealing matching hole form a clearance fit, generally speaking, if the second sealing ring has been separated from the hole wall of the sealing matching hole, but the convex shoulder on the second sealing ring is still located in the sealing matching hole, the space between the two for outside air to enter the water passage cavity is relatively small. In order to ensure that outside air can stably enter the water passage cavity, the convex shoulder needs to be completely out of the sealing matching hole. By opening the air passage groove part to the convex shoulder above the second sealing ring, it is possible to ensure that outside air can stably enter the water passage cavity to achieve the antifreeze function without having to make the convex shoulder come out of the sealing matching hole.

[0018] In the above-mentioned antifreeze faucet, the valve body has a blocking port in the water flow chamber, the lower end of the control rod is slidably connected to the valve core along its center line direction, a check spring is arranged between the valve core and the lower end of the control rod, the valve core is pressed against the blocking port under the action of the check spring, a pre-closing spring is also arranged between the lower end of the control rod and the valve core, one end of the pre-closing spring is suspended when the second sealing ring presses against the inner wall of the valve body to form a seal, and the two ends of the pre-closing spring press against the control rod and the valve core respectively before the control rod moves to separate the second sealing ring from the inner wall of the valve body.

[0019] Under normal water discharge state, the control rod is at a higher position, at which time the two ends of the check spring are respectively against the valve core and the lower end of the control rod, while one end of the pre-closing spring is suspended, that is, it is not against the control rod and the valve core at the same time. The water coming in from the water inlet, under the action of water pressure, pushes the valve core open to overcome the action of the check spring, and if there is water backflow in the pipe, the backflow water pressure and the elastic force of the check spring work together to make the valve core tightly against the blocking port to block the water inlet and the water outlet.

[0020] When the control rod is rotated until the second sealing ring is just separated from the inner wall of the valve body, if the control rod is just in the state where its lower end presses the valve core against the blocking port, although the water inlet is blocked, the external air cannot smoothly enter the water passage cavity at this time (because the second sealing ring is a little outside the lower end opening of the sealing matching hole at this time, and the gap for the external air to pass here is very small). Therefore, a pre-closing spring is arranged between the lower end of the control rod and the valve core, and the two ends of the pre-closing spring respectively abut against the control rod and the valve core before the second sealing ring begins to separate from the inner wall of the valve body, so that the pre-closing spring will begin to act on the valve core to press against the blocking port to block the water inlet, that is, it plays the role of pre-closing the antifreeze faucet before the control rod is rotated into place, so that on the one hand, the water inlet is ensured to be blocked, and on the other hand, the control rod can still have a certain moving distance to make the second sealing ring as far away from the lower end opening of the sealing matching hole as possible, so as to ensure that the external air can smoothly enter the water passage cavity to stably realize the antifreeze function.

[0021] In the above-mentioned antifreeze faucet, the upper end of the pre-closing spring is positioned with the control rod, the valve core has a first abutment surface, and when the second sealing ring abuts against the inner wall of the valve body, there is a distance between the first abutment surface and the lower end of the pre-closing spring.

[0022] Through the above arrangement, when the second sealing ring abuts against the inner wall of the valve body, there is a gap between the second abutting surface and the lower end of the pre-closing spring, that is, the lower end of the pre-closing spring is suspended, which ensures that the pre-closing spring does not work when the antifreeze faucet is in a normal water discharge state, and does not affect the normal movement of the valve core under the action of the water inlet pressure. Before the control rod rotates to separate the second sealing ring from the inner wall of the valve body, the first abutting surface abuts against the lower end of the pre-closing spring, so that the pre-closing spring begins to act on the valve core and plays a role in pre-closing the antifreeze faucet.

[0023] In the above-mentioned antifreeze faucet, as another technical solution, the lower end of the pre-closing spring is positioned with the valve core, the control rod has a second abutment surface, and when the second sealing ring abuts against the inner wall of the valve body, there is a distance between the second abutment surface and the upper end of the pre-closing spring.

[0024] Through the above arrangement, when the second sealing ring abuts against the inner wall of the valve body, there is a gap between the first abutting surface and the upper end of the pre-closing spring, that is, the upper end of the pre-closing spring is suspended, which ensures that the pre-closing spring does not work when the antifreeze faucet is in a normal water discharge state, and does not affect the normal movement of the valve core under the action of the water inlet pressure. Before the control rod rotates to separate the second sealing ring from the inner wall of the valve body, the second abutting surface abuts against the upper end of the pre-closing spring, so that the pre-closing spring begins to act on the valve core to pre-close the antifreeze faucet.

[0025] In the above-mentioned antifreeze faucet, the lower end of the control rod has a mounting hole, the valve core includes a circular head and a cylindrical mating portion fixedly connected to the upper side of the head, the upper end of the mating portion is located in the mounting hole, the check spring and the pre-closing spring are both located in the mounting hole, the inner diameter of the pre-closing spring is larger than the outer diameter of the check spring, and the check spring passes through the pre-closing spring.

[0026] Through the above-mentioned configuration, the pre-closing spring can be used to act on the valve core to pre-close the antifreeze faucet before the second sealing ring is separated from the inner wall of the valve body, while ensuring that the setting of the pre-closing spring will not affect the continued movement of the control rod to completely separate the second sealing ring from the inner wall of the valve body.

[0027] In the above-mentioned antifreeze faucet, the upper end of the matching part has a positioning hole 1, and the control rod also has a positioning hole 2 whose lower end opening is connected to the mounting hole, and the two ends of the check spring are respectively located in the positioning hole 1 and the positioning hole 2.

[0028] Compared with the prior art, this antifreeze faucet has the following advantages:

[0029] 1. An air inlet is arranged on the outside of the valve body, and a second sealing ring is arranged on the outer peripheral side of the lower end of the control rod, which is against the inner wall of the valve body. The second sealing ring is located between the air inlet and the water outlet. When the control rod controls the water inlet and the water outlet to be blocked, the second sealing ring is separated from the inner wall of the valve body and the air inlet and the water outlet are connected, so that the outside air can enter the water outlet and the water remaining in the water outlet and the water remaining in the water pipe are automatically discharged, so that the antifreeze faucet can discharge the water remaining in the water outlet and the water remaining in the water pipe when it is closed without the help of the connection of the drainage joint to prevent freezing, thereby preventing the occurrence of poor antifreeze effect or failure of the antifreeze function due to factors such as loose connection of the drainage joint, thereby improving the stability of antifreeze;

[0030] 2. You only need to turn the control lever to prevent the faucet and water pipes from freezing. There is no need to disassemble the water pipes, so the operation is more convenient.

[0031] 3. A pre-closing spring is arranged between the lower end of the control rod and the valve core. When the antifreeze faucet is in normal use, one end of the pre-closing spring is suspended in the air without affecting the normal activity of the valve core. When the control rod is rotated to realize the antifreeze function, the pre-closing spring is used to act on the valve core to realize the pre-closing of the antifreeze faucet, ensuring that water will not flow out directly from the air inlet before the second sealing ring is separated from the inner wall of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of the antifreeze faucet in the first embodiment in a normal state.

[0033] Figure 2 yes Figure 1 Schematic diagram of the control lever.

[0034] Figure 3 yes Figure 2 Sectional view along AA direction.

[0035] Figure 4 It is a cross-sectional view of the antifreeze faucet in the first embodiment in the pre-closed state.

[0036] Figure 5 It is a cross-sectional view of the antifreeze faucet in the first embodiment in a closed state.

[0037] In the figure, 1, valve body; 1a, main body; 1a1, water inlet; 1a2, water outlet; 1a3, water passage chamber; 1a4, partition; 1a5, blocking port; 1b, valve cap; 1b1, air inlet hole; 1b2, annular air guide groove; 1b3, threaded connection hole; 1b4, sealing matching hole; 2, control rod; 2a, air passage groove; 2b, boss; 2b1, mounting groove; 2c, mounting hole; 2d, positioning hole 2; 3, hand wheel; 4, first sealing ring; 5, valve core; 5a, head; 5b, matching part; 5b1, positioning hole 1; 5c, first abutment surface; 6, check spring; 7, sealing gasket; 8, second sealing ring; 9, pre-closing spring. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] Embodiment 1

[0040] like Figure 1 As shown, the antifreeze faucet comprises a valve body 1 having a water inlet 1a1 and a water outlet 1a2, and a control rod 2 which is threadedly connected to the valve body 1 and has its lower end located inside the valve body 1. When the control rod 2 rotates, it can move along its own center line and control the water inlet 1a1 to be connected or disconnected from the water outlet 1a2. The upper end of the control rod 2 extends out of the upper end of the valve body 1 and is fixedly connected to a hand wheel 3. The upper end of the valve body 1 is provided with a first sealing ring 4 which abuts against the outer peripheral wall of the upper end of the control rod 2 to form a seal at the extending portion of the control rod 2. Specifically, the valve body 1 has a water passage chamber 1a3 connecting the water inlet 1a1 with the water outlet 1a2, and the valve body 1 has a partition 1a4 in the water passage chamber 1a3 for dividing the water passage chamber 1a3 into two parts. The partition 1a4 is provided with a blocking port 1a5 for connecting the two parts of the water passage chamber 1a3. The lower end of the control rod 2 is slidably connected with a valve core 5 along its center line direction, a check spring 6 is provided between the valve core 5 and the lower end of the control rod 2, a sealing gasket 7 is embedded in the bottom of the valve core 5, and the valve core 5 abuts against the blocking port 1a5 under the action of the check spring 6.

[0041] Furthermore, if Figure 1 , Figure 2 and Figure 3 As shown, an air inlet 1b1 is provided on the outside of the valve body 1, and a second sealing ring 8 is provided on the outer peripheral side of the lower end of the control rod 2 to form a seal against the inner wall of the valve body 1. The second sealing ring 8 is located between the air inlet 1b1 and the water outlet 1a2. When the control rod 2 controls the water inlet 1a1 and the water outlet 1a2 to be blocked, the second sealing ring 8 is separated from the inner wall of the valve body 1 and the air inlet 1b1 is connected to the water outlet 1a2. Specifically, an annular air guide groove 1b2 is provided on the inner wall of the valve body 1 at the threaded connection between the valve body 1 and the control rod 2. The number of air inlet 1b1 is several and each air inlet 1b1 is connected to the annular air guide groove 1b2. A plurality of strip-shaped air passage grooves 2a are provided on the outer peripheral side of the control rod 2 located in the valve body 1 along the axial direction of the control rod 2, and the second sealing ring 8 is located below each air passage groove 2a. The air inlet hole 1b1 is a blind hole, the opening of the air inlet hole 1b1 is set downward, and the annular air guide groove 1b2 is laterally connected to the air inlet hole 1b1. The upper end of the valve body 1 has a threaded connection hole 1b3 and a sealing matching hole 1b4 which is concentrically arranged with the threaded connection hole 1b3 and is a light hole. The sealing matching hole 1b4 is connected to the water passage chamber 1a3. The annular air guide groove 1b2 is located on the inner side of the threaded connection hole 1b3. The aperture of the sealing matching hole 1b4 is larger than that of the threaded connection hole 1b3. The outer peripheral side of the lower end of the control rod 2 has a convex shoulder 2b that can form a clearance fit with the sealing matching hole 1b4. The outer peripheral side of the convex shoulder 2b is provided with an installation groove 2b1, and the second sealing ring 8 is arranged in the installation groove 2b1. Among them, the air passage groove 2a part is opened to the convex shoulder 2b above the second sealing ring 8.

[0042] In this embodiment, the valve body 1 includes a main body 1a and a valve cap 1b threadedly connected to the upper end of the main body 1a, the air inlet 1b1, the annular air guide groove 1b2, the threaded connection hole 1b3 and the sealing matching hole 1b4 are all located on the valve cap 1b, and the water inlet 1a1, the water outlet 1a2, the water passage chamber 1a3 and the blocking port 1a5 are located in the main body 1a.

[0043] Furthermore, if Figure 1 and Figure 2As shown, a pre-closing spring 9 is further provided between the lower end of the control rod 2 and the valve core 5. When the second sealing ring 8 abuts against the inner wall of the valve body 1, i.e., the hole wall of the sealing matching hole 1b4, to form a seal, one end of the pre-closing spring 9 is suspended in the air. Before the second sealing ring 8 is separated from the inner wall of the valve body 1, the two ends of the pre-closing spring 9 abut against the control rod 2 and the valve core 5, respectively. Specifically, the upper end of the pre-closing spring 9 is positioned with the control rod 2, and the positioning here can be that the two are directly fixedly connected, and the valve core 5 has a first abutting surface 5c. When the second sealing ring 8 abuts against the inner wall of the valve body 1, there is a gap between the first abutting surface 5c and the lower end of the pre-closing spring 9. In this embodiment, the lower end of the control rod 2 has a mounting hole 2c, the valve core 5 includes a circular head 5a and a columnar matching portion 5b fixedly connected to the upper side of the head 5a, the outer diameter of the matching portion 5b is smaller than the outer diameter of the head 5a, the upper end of the matching portion 5b is located in the mounting hole 2c, the check spring 6 and the pre-closing spring 9 are both located in the mounting hole 2c, the inner diameter of the pre-closing spring 9 is larger than the outer diameter of the check spring 6, and the check spring 6 passes through the pre-closing spring 9. Among them, the first abutting surface 5c is the upper end surface of the matching portion 5b, the upper end of the matching portion 5b has a positioning hole 1 5b1, the control rod 2 also has a positioning hole 2d whose lower end opening is connected to the mounting hole 2c, and the two ends of the check spring 6 are respectively located in the positioning hole 1 5b1 and the positioning hole 2 2d.

[0044] Under normal conditions, Figure 1 As shown, the control rod 2 is at a higher position, that is, in a state where the water inlet 1a1 and the water outlet 1a2 are connected. At this time, the second sealing ring 8 abuts against the hole wall of the sealing matching hole 1b4 to form a seal and block between the air inlet 1b1 and the water outlet 1a2, and the two ends of the check spring 6 abut against the valve core 5 and the lower end of the control rod 2 respectively but are not compressed, and the lower end of the pre-closing spring 9 is in a suspended state. The water coming in from the water inlet 1a1, under the action of water pressure, pushes the valve core 5 open to overcome the action of the check spring 6, and thus enters the water passage chamber 1a3 and then flows into the pipe from the water outlet 1a2. If there is water backflow in the pipe, the backflow water pressure and the elastic force of the check spring 6 work together to make the valve core 5 tightly abut against the blocking port 1a5 to block the water inlet 1a1 and the water outlet 1a2. In a normal water outlet state, since the water is always flowing, there will be no freezing in the water pipe connected to the water outlet 1a2.

[0045] When the user rotates the control rod 2 to make it move downward along its own center line, the second sealing ring 8 will move along with it because it is arranged on the outer peripheral side of the control rod 2, and at the same time, the lower end of the pre-closing spring 9 will also move downward with the control rod 2. When the lower end of the pre-closing spring 9 abuts against the valve core 5, the pre-closing spring 9 begins to act on the valve core 5 to make it press against the blocking port 1a5 to block the water inlet (in practice, the pre-closing spring 9 is required not to be easily pushed open by the incoming water pressure), that is, the antifreeze faucet is pre-closed before the control rod 2 is rotated to separate the second sealing ring 8 from the inner wall of the valve body 1. At this time, the antifreeze faucet has been pre-closed, that is, the valve core 5 can no longer be pushed open by the incoming water pressure, and at the same time, the lower end of the control rod 2 can continue to move downward because it has not yet abutted against the valve core 5. When the antifreeze faucet is in the pre-closed state, Figure 4 Continue to rotate the control rod 2 to make it move downward until the second sealing ring 8 is separated from the opening of the sealing matching hole 1b4 and until the antifreeze faucet is in the position shown in FIG. Figure 5 In the fully closed state shown, the upper part of the air groove 2a is located at the position of the annular air guide groove 1b2, and the lower part of the air groove 2a is located at the water passage chamber 1a3, so that the external air enters the annular air guide groove 1b2 from each air inlet hole 1b1, and then finally enters the water outlet 1a2 through each air groove 2a, and under the action of air pressure, the water remaining in the water outlet 1a2 and the water remaining in the water pipe are discharged to prevent freezing due to water accumulation.

[0046] Embodiment 2

[0047] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the lower end of the pre-closing spring 9 is positioned with the valve core 5, and similarly, the positioning here can be that the two are directly fixedly connected, and the control rod 2 has a second abutting surface, and when the second sealing ring 8 abuts against the inner wall of the valve body 1, there is a gap between the second abutting surface and the upper end of the pre-closing spring 9. The second abutting surface is the bottom surface of the mounting hole 2c (the bottom surface here refers to the surface facing the orifice of the mounting hole 2c).

[0048] Through the above arrangement, when the second sealing ring 8 abuts against the inner wall of the valve body 1, there is a gap between the second abutting surface and the upper end of the pre-closing spring 9, that is, the upper end of the pre-closing spring 9 is suspended, which ensures that the pre-closing spring 9 does not work when the antifreeze faucet is in a normal water discharge state, and does not affect the normal activity of the valve core 5 under the water pressure of the inlet water. When the second sealing ring 8 is separated from the inner wall of the valve body 1, the second abutting surface abuts against the upper end of the pre-closing spring 9, so that the pre-closing spring 9 starts to act on the valve core 5 and plays a role in pre-closing the antifreeze faucet.

[0049] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An antifreeze faucet, comprising a valve body (1) having a water inlet (1a1) and a water outlet (1a2), and a control rod (2) threadedly connected to the valve body (1) and with its lower end located inside the valve body (1), wherein the control rod (2) can move along its own center line when rotating and control the connection or blocking of the water inlet (1a1) and the water outlet (1a2), characterized in that: The valve body (1) is provided with an air inlet (1b1) on the outside, and a second sealing ring (8) abutting against the inner wall of the valve body (1) is provided on the outer peripheral side of the lower end of the control rod (2). The second sealing ring (8) is located between the air inlet (1b1) and the water outlet (1a2). When the control rod (2) controls the water inlet (1a1) and the water outlet (1a2) to be blocked, the second sealing ring (8) is separated from the inner wall of the valve body (1) and the air inlet (1b1) and the water outlet (1a2) are connected.

2. The antifreeze faucet according to claim 1, characterized in that: The inner wall of the valve body (1) is provided with an annular air guide groove (1b2) at the threaded connection between the valve body (1) and the control rod (2); the number of air inlet holes (1b1) is multiple and each air inlet hole (1b1) is connected to the annular air guide groove (1b2); the outer peripheral side of the control rod (2) located in the valve body (1) is provided with a plurality of strip-shaped air passage grooves (2a) arranged along the axial direction of the control rod (2); and the second sealing ring (8) is located below each air passage groove (2a).

3. The antifreeze faucet according to claim 2, characterized in that: The air inlet hole (1b1) is a blind hole, the opening of the air inlet hole (1b1) is arranged downward, and the annular air guide groove (1b2) is laterally connected to the air inlet hole (1b1).

4. The antifreeze faucet according to claim 3, characterized in that: The valve body (1) has a water passage cavity (1a3) therein, the upper end of the valve body (1) has a threaded connection hole (1b3) for threaded connection of a control rod (2) and a sealing matching hole (1b4) which is arranged concentrically with the threaded connection hole (1b3) and is a smooth hole, the annular air guide groove (1b2) is located inside the threaded connection hole (1b3), the sealing matching hole (1b4) is connected to the water passage cavity (1a3), the aperture of the sealing matching hole (1b4) is larger than that of the threaded connection hole (1b3), the outer peripheral side of the lower end of the control rod (2) has a boss (2b) which can form a clearance fit with the sealing matching hole (1b4), the outer peripheral side of the boss (2b) is provided with a mounting groove (2b1), and a second sealing ring (8) is arranged in the mounting groove (2b1).

5. The antifreeze faucet according to claim 4, characterized in that: The air passage groove (2a) is partially opened to the convex shoulder (2b) above the second sealing ring (8).

6. The antifreeze faucet according to claim 4, characterized in that: The valve body (1) has a blocking opening (1a5) in the water passage chamber (1a3); the lower end of the control rod (2) is slidably connected to a valve core (5) along the center line direction thereof; a check spring (6) is arranged between the valve core (5) and the lower end of the control rod (2); the valve core (5) is pressed against the blocking opening (1a5) under the action of the check spring (6); a pre-closing spring (9) is also arranged between the lower end of the control rod (2) and the valve core (5); one end of the pre-closing spring (9) is suspended when the second sealing ring (8) and the inner wall of the valve body (1) are pressed against each other to form a seal; before the control rod (2) moves to separate the second sealing ring (8) from the inner wall of the valve body (1), the two ends of the pre-closing spring (9) are pressed against the control rod (2) and the valve core (5) respectively.

7. The antifreeze faucet according to claim 6, characterized in that: The upper end of the pre-closing spring (9) is positioned with respect to the control rod (2), the valve core (5) has a first abutting surface (5c), and when the second sealing ring (8) abuts against the inner wall of the valve body (1), there is a distance between the first abutting surface (5c) and the lower end of the pre-closing spring (9).

8. The antifreeze faucet according to claim 6, characterized in that: The lower end of the pre-closing spring (9) is positioned with the valve core (5), the control rod (2) has a second abutment surface, and when the second sealing ring (8) abuts against the inner wall of the valve body (1), there is a distance between the second abutment surface and the upper end of the pre-closing spring (9).

9. The antifreeze faucet according to claim 7 or 8, characterized in that: The lower end of the control rod (2) has a mounting hole (2c), the valve core (5) includes a circular head (5a) and a cylindrical matching portion (5b) fixedly connected to the upper side of the head (5a), the upper end of the matching portion (5b) is located in the mounting hole (2c), the check spring (6) and the pre-closing spring (9) are both located in the mounting hole (2c), the inner diameter of the pre-closing spring (9) is larger than the outer diameter of the check spring (6), and the check spring (6) passes through the pre-closing spring (9).

10. The antifreeze faucet according to claim 9, characterized in that: The upper end of the matching portion (5b) has a positioning hole 1 (5b1), and the control rod (2) also has a positioning hole 2 (2d) whose lower end opening is connected to the mounting hole (2c), and the two ends of the check spring (6) are respectively located in the positioning hole 1 (5b1) and the positioning hole 2 (2d).

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