Anti-freezing faucet

Abstract

The utility model 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 utility model belongs to the technical field of faucet, and relates to a freeze-proof faucet. BACKGROUND

[0002] At present, more and more residences are provided with gardens to facilitate people to plant flowers, grass or vegetables in the gardens, so that it is necessary to set a faucet and connect a water pipe in the garden to facilitate people to water in a large area. When the faucet is closed, water is often left in the water pipe and the faucet, and in winter or some areas where cold weather lasts all year round, the faucet or the water pipe is prone to be unable to be used due to the freezing of the left water.

[0003] Therefore, the applicant has proposed a patent application No. 201811036062.2, an automatic water discharge connector, which comprises a body with a water inlet end at the upper end and a water outlet end at the lower end, a sealing gasket in the form of a ring is arranged in the water inlet end, a baffle with a smaller cross section than the sealing gasket is arranged in the water inlet end, the baffle abuts against the sealing gasket and closes the upper opening of the central hole of the sealing gasket, a gas inlet hole is arranged on the outer side of the body and is in communication with the water outlet end, the sealing gasket can deform downward and close the gas inlet hole when water enters, a sleeve is slidably connected in the water outlet end, a support member with elasticity is connected to the sleeve, and a gap is formed between the upper end of the support member and the lower end surface of the sealing gasket. After the sleeve moves upward, the upper end of the support member can abut against the sealing gasket. After the faucet is closed, water is left in the faucet and the water pipe, the sealing gasket and the support member are simultaneously reset upward by relying on their own elastic force, the upper end of the support member abuts against the lower end surface of the sealing gasket again, the left water in the faucet enters the water inlet end of the body, but the force of the left water acting on the sealing gasket is smaller than the elastic force of the sealing gasket plus the elastic force of the support member abutting against the sealing gasket, so that the left water is isolated in the water inlet end, and the outside air enters the water pipe along the water outlet end due to the opening of the gas inlet hole, so that the water left in the water pipe is discharged under the action of the air pressure to prevent the water pipe from freezing due to the left water. After the left water in the water pipe is discharged, the water pipe is detached from the water outlet end of the body, at this time, the sleeve moves downward without the constraint of the water pipe, and thus the support member moves downward to form a gap between the upper end of the support member and the lower end surface of the sealing gasket. The pressure of the left water in the faucet isolated in the water inlet end acting on the sealing gasket is greater than the elastic force of the sealing gasket, so that the upper opening of the central hole of the sealing gasket is opened again, so that the left water in the faucet is discharged outward to prevent the faucet from freezing.

[0004] However, it also has shortcomings: the anti-freezing of the faucet needs to be realized after the water pipe is detached from the body of the automatic drainage connector, and then the water pipe needs to be connected again next time, so the operation is relatively inconvenient. Moreover, the connection firmness between the automatic drainage connector and the faucet affects the stability of the anti-freezing, and if the connection between the automatic drainage connector and the faucet is loose during use, the anti-freezing function may fail. Utility model content

[0005] The utility model discloses to solve the problem of inconvenient anti-freezing operation and poor anti-freezing stability.

[0006] The utility model discloses the purpose can be realized through the following technical scheme:

[0007] The anti-freezing faucet, including the valve body with the water inlet and the water outlet and the control rod with the lower end in the valve body and being screwed with the valve body, the control rod can move along the center line and control the communication or block of the water inlet and the water outlet when rotating, characterized in that, the valve body outside is equipped with the air inlet hole, the lower end of the control rod is equipped with the second sealing ring that abuts against the inner wall of the valve body on the outer circumferential side, and the second sealing ring is located between the air inlet hole and the water outlet, and the second sealing ring is separated from the inner wall of the valve body and makes the air inlet hole and the water outlet communicate when the control rod controls the water inlet and the water outlet to block.

[0008] In the normal state, the control rod is in the state of making the water inlet and the water outlet communicate, and the second sealing ring abuts against the inner wall of the valve body to form a seal and block between the air inlet hole and the water outlet, so that water can flow into the water outlet from the water inlet, but external air cannot flow into the water outlet from the air inlet and water in the valve body from the water inlet cannot flow out from the air inlet hole. Since water is always flowing, the water pipe connected outside the water outlet cannot freeze. When the user rotates the control rod to move along the center line in the direction of controlling the water inlet and the water outlet to block, the second sealing ring moves together because it is arranged on the outside of the control rod. When the control rod moves along the center line to block the water inlet and the water outlet, that is, the anti-freezing faucet is in the closed state, the second sealing ring is separated from the inner wall of the valve body and makes the air inlet hole and the water outlet communicate, so that water cannot flow into the valve body from the water inlet (the purpose of blocking the water inlet is to ensure that water cannot flow out from the air inlet), and external air enters the water outlet through the air inlet hole, and then the water remaining in the water outlet and the water remaining in the water pipe is discharged under the action of air pressure to prevent water from freezing.

[0009] Through the above arrangement, the anti-freezing faucet can discharge the water remaining in the water outlet and the water remaining in the water pipe to prevent freezing when it is closed without the connection of the drain connector, so that the poor anti-freezing effect or the failure of the anti-freezing function caused by the loose connection of the drain connector and other factors will not occur, and the stability of the anti-freezing is improved. Moreover, the anti-freezing of the faucet and the water pipe can be realized by only rotating the control rod, and the water pipe does not need to be disassembled, so the operation is more convenient.

[0010] In the above anti-freezing 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 the air inlet holes is several, and each air inlet hole is in communication with the annular air guide groove, and the outer periphery of the control rod in the valve body is provided with several strip-shaped air passing grooves arranged along the axial direction of the control rod, and the second sealing ring is located below each air passing groove.

[0011] In the state that the second sealing ring is separated from the inner wall of the valve body, the upper part of each air passing groove is located at the position of the annular air guide groove, and the lower part of each air passing groove is in communication with the water outlet. The external air first enters the annular air guide groove from each air inlet hole, and then enters the water outlet through each air passing 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 and moves along its own axis to control the water inlet and the water outlet from the communication state to the blocking state, through the arrangement of the annular air guide groove and each air passing groove, it can be ensured that the external air can always stably enter the water outlet to perform the anti-freezing function.

[0012] In the above anti-freezing faucet, the air inlet hole is a blind hole, the hole of the air inlet hole is arranged downward, and the annular air guide groove is in lateral communication with the air inlet hole.

[0013] Through the above arrangement, it can be ensured that rainwater cannot enter the valve body from the air inlet hole, which also ensures that the external air can stably enter the water outlet to perform the anti-freezing function.

[0014] In the above anti-freezing faucet, the valve body has a water passing cavity, the upper end of the valve body has a threaded connection hole for threaded connection of the control rod, and a sealing fitting hole concentrically arranged with the threaded connection hole and being a light hole, the annular air guide groove is located inside the threaded connection hole, the sealing fitting hole is in communication with the water passing cavity, the hole diameter of the sealing fitting hole is larger than that of the threaded connection hole, the lower end of the control rod has a shoulder capable of forming a clearance fit with the sealing fitting hole on the outer periphery, the outer periphery of the shoulder is provided with a mounting groove, and the second sealing ring is arranged in the mounting groove.

[0015] When the anti-freezing faucet is in normal water passing state, the convex shoulder is located in the sealing fitting hole and is sealed by the second sealing ring and the hole wall of the sealing fitting hole, so as to block the communication between the air inlet hole and the water passing cavity. When the control rod is rotated to move downward and the second sealing ring is separated from the hole wall of the sealing fitting hole, the lower end slot of the air passing groove is communicated with the air passing cavity, so that the external air can enter the water passing cavity through the air inlet hole, the annular air guide groove and the air passing groove in sequence, and then enters the water outlet to realize the anti-freezing function.

[0016] In the anti-freezing faucet, the air passing groove is partially provided above the convex shoulder of the second sealing ring.

[0017] Because the convex shoulder and the sealing fitting hole form a clearance fit, in general, if the second sealing ring has been separated from the hole wall of the sealing fitting hole, but the convex shoulder on the upper part of the second sealing ring is still located in the sealing fitting hole, the space between the two for the external air to enter the water passing cavity is relatively small. In order to ensure that the external air can stably enter the water passing cavity, the convex shoulder needs to be completely taken out of the sealing fitting hole. By partially providing the air passing groove above the convex shoulder of the second sealing ring, the external air can stably enter the water passing cavity to realize the anti-freezing function without the need to completely take the convex shoulder out of the sealing fitting hole.

[0018] In the anti-freezing faucet, the valve body has a blocking port in the water passing cavity, the lower end of the control rod is slidingly connected with a valve core along the center line direction, a check spring is arranged between the valve core and the lower end of the control rod in abutment, the valve core abuts at the blocking port under the action of the check spring, and a pre-closing spring is further 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 abuts with the inner wall of the valve body to form a seal, and the two ends of the pre-closing spring abut with 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] In the normal water passing state, the control rod is at a higher position, at this time, the two ends of the check spring abut with the valve core and the lower end of the control rod respectively, and one end of the pre-closing spring is in suspension, that is, it does not abut with the control rod and the valve core at the same time. The water coming from the water inlet will push open the valve core against the action of the check spring under the water pressure, and if the water in the pipe flows back, the water pressure of the backflow and the elastic force of the check spring will jointly act on the valve core to tightly abut the valve core at the blocking port to block the water inlet and the water outlet.

[0020] When the control lever is rotated to the position that the second sealing ring is just separated from the inner wall of the valve body, if the control lever is also in the state that the lower end of the control lever is abutting against the valve core to block the water inlet, although the water inlet is blocked, the external air cannot enter the water passing cavity smoothly (because at this time the second sealing ring is in the position that it is separated from the lower end of the sealing fitting hole by a small distance, and the gap for the external air to pass through is very small). Therefore, the pre-closing spring is arranged between the lower end of the control lever and the valve core, and the two ends of the pre-closing spring abut against the control lever and the valve core respectively before the second sealing ring is separated from the inner wall of the valve body. Thus, the pre-closing spring starts to act on the valve core to make the valve core abut against the blocking port to block the water inlet, that is, the pre-closing spring plays a role of pre-closing the anti-freezing faucet before the control lever is rotated to the position. In this way, on the one hand, the water inlet is blocked, and on the other hand, the control lever still has a certain moving distance to make the second sealing ring as far as possible from the position of the lower end of the sealing fitting hole, so as to ensure that the external air can enter the water passing cavity smoothly to realize the anti-freezing function stably.

[0021] In the above anti-freezing faucet, the upper end of the pre-closing spring is positioned with the control lever, the valve core has the first abutting surface, and the first abutting surface has a distance from the lower end of the pre-closing spring when the second sealing ring abuts against the inner wall of the valve body.

[0022] Through the above arrangement, the second abutting surface has a distance from the lower end of the pre-closing spring when the second sealing ring abuts against the inner wall of the valve body, that is, the lower end of the pre-closing spring is suspended. In this way, it is ensured that the pre-closing spring does not act when the anti-freezing faucet is in the normal water outlet state, and does not affect the normal movement of the valve core under the water inlet water pressure. Before the control lever is rotated 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 first, so that the pre-closing spring starts to act on the valve core to play a role of pre-closing the anti-freezing faucet.

[0023] In the above anti-freezing faucet, as another technical solution, the lower end of the pre-closing spring is positioned with the valve core, and the control lever has the second abutting surface. The second abutting surface has a distance from the upper end of the pre-closing spring when the second sealing ring abuts against the inner wall of the valve body.

[0024] Through the above arrangement, the first abutting surface has a distance from the upper end of the pre-closing spring when the second sealing ring abuts against the inner wall of the valve body, that is, the upper end of the pre-closing spring is suspended. In this way, it is ensured that the pre-closing spring does not act when the anti-freezing faucet is in the normal water outlet state, and does not affect the normal movement of the valve core under the water inlet water pressure. Before the control lever is rotated 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 first, so that the pre-closing spring starts to act on the valve core to play a role of pre-closing the anti-freezing faucet.

[0025] In the anti-freezing faucet, the lower end of the control rod has a mounting hole, the valve core comprises a circular head and a cylindrical fitting part fixed to the upper side of the head, the upper end of the fitting part 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 arrangement, the anti-freezing faucet can be pre-closed by the pre-closing spring acting on the valve core before the second sealing ring is separated from the inner wall of the valve body, and the arrangement of the pre-closing spring does not affect the continuous movement of the control rod to separate the second sealing ring from the inner wall of the valve body.

[0027] In the anti-freezing faucet, the upper end of the fitting part has a positioning hole one, the control rod further has a positioning hole two which is in communication with the mounting hole and the lower end hole, and the two ends of the check spring are located in the positioning hole one and the positioning hole two respectively.

[0028] Compared with the prior art, the anti-freezing faucet has the following advantages:

[0029] 1. The air inlet hole is arranged on the outer side of the valve body, the second sealing ring is arranged on the outer peripheral side of the lower end of the control rod and abuts against the inner wall of the valve body, the second sealing ring is located between the air inlet hole and the water outlet, and the second sealing ring is separated from the inner wall of the valve body and makes the air inlet hole communicate with the water outlet when the control rod controls the water inlet to be blocked, so that the external air can enter the water outlet and automatically drain the water remaining in the water outlet and the water remaining in the water pipe, so that the anti-freezing faucet can drain the water remaining in the water outlet and the water remaining in the water pipe when it is closed without the connection of the drain connector, thereby preventing freezing. Therefore, the phenomenon of poor anti-freezing effect or failure of the anti-freezing function caused by loose connection of the drain connector and the like is avoided, and the stability of anti-freezing is improved.

[0030] 2. The anti-freezing of the faucet and the water pipe can be realized by only rotating the control rod, and it is not necessary to disassemble the water pipe, so that the operation is more convenient.

[0031] 3. The pre-closing spring is arranged between the lower end of the control rod and the valve core, one end of the pre-closing spring is suspended and does not affect the normal movement of the valve core when the anti-freezing faucet is normally used, the pre-closing spring acts on the valve core when the control rod is rotated to realize the anti-freezing function, so that the anti-freezing faucet is pre-closed, and the water is prevented from flowing out directly from the air inlet hole before the second sealing ring is separated from the inner wall of the valve body. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a sectional view of the anti-freezing faucet in Example One in a normal state.

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

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

[0035] Figure 4 This is a cross-sectional view of the antifreeze faucet in the pre-closed state in Embodiment 1.

[0036] Figure 5 This is a cross-sectional view of the antifreeze faucet in the closed state in Embodiment 1.

[0037] In the diagram, 1. Valve body; 1a. Body; 1a1. Inlet; 1a2. Outlet; 1a3. Water passage cavity; 1a4. Divider; 1a5. Blocking port; 1b. Valve cap; 1b1. Air inlet; 1b2. Annular air guide groove; 1b3. Threaded connection hole; 1b4. Sealing mating hole; 2. Control rod; 2a. Air passage groove; 2b. Shoulder; 2b1. Mounting groove; 2c. Mounting hole; 2d. Positioning hole two; 3. Handwheel; 4. First sealing ring; 5. Valve core; 5a. Head; 5b. Mating part; 5b1. Positioning hole one; 5c. First abutment surface; 6. Check spring; 7. Sealing washer; 8. Second sealing ring; 9. Pre-closing spring. Detailed Implementation

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

[0039] Example 1

[0040] like Figure 1 As shown, the antifreeze faucet includes a valve body 1 with an inlet 1a1 and an outlet 1a2, and a control rod 2 threadedly connected to the valve body 1 with 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 connection or disconnection between the inlet 1a1 and the 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 handwheel 3. The upper end of the valve body 1 at the point where the control rod 2 extends is provided with a first sealing ring 4 that abuts against the outer peripheral wall of the upper end of the control rod 2 to form a seal. Specifically, the valve body 1 has a water passage cavity 1a3 that connects the inlet 1a1 and the outlet 1a2. The valve body 1 has a partition 1a4 that divides the water passage cavity 1a3 into two parts. The partition 1a4 is provided with a blocking port 1a5 that connects the two parts of the water passage cavity 1a3. The lower end of the control rod 2 is slidably connected to the valve core 5 along its center line. 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 at the bottom of the valve core 5. The valve core 5 abuts against the blocking port 1a5 under the action of the check spring 6.

[0041] Further, as shown in Figure 1 , Figure 2 and Figure 3 , the outer side of the valve body 1 is provided with air inlet holes 1b1, the lower end of the control rod 2 is provided with a second sealing ring 8 on the outer periphery side, which abuts against the inner wall of the valve body 1 to form a seal, the second sealing ring 8 is located between the air inlet holes 1b1 and the water outlet 1a2, and 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 makes the air inlet holes 1b1 and the water outlet 1a2 communicate. Specifically, 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 several, and each air inlet hole 1b1 is in communication with the annular air guide groove 1b2, the outer periphery side of the control rod 2 located in the valve body 1 is provided with several strip-shaped air passing grooves 2a arranged along the axial direction of the control rod 2, and the second sealing ring 8 is located below each air passing groove 2a. The air inlet hole 1b1 is a blind hole, the hole of the air inlet hole 1b1 is arranged downward, and the annular air guide groove 1b2 is in lateral communication with the air inlet hole 1b1. The upper end of the valve body 1 has a threaded connection hole 1b3 and a sealing fitting hole 1b4 which is concentrically arranged with the threaded connection hole 1b3 and is a light hole, the sealing fitting hole 1b4 is in communication with the water passing cavity 1a3, the annular air guide groove 1b2 is located on the inner side of the threaded connection hole 1b3, the hole diameter of the sealing fitting hole 1b4 is larger than that of the threaded connection hole 1b3, the lower end of the control rod 2 has a shoulder 2b which can form a clearance fit with the sealing fitting hole 1b4, the outer periphery side of the shoulder 2b is provided with a mounting groove 2b1, and the second sealing ring 8 is arranged in the mounting groove 2b1. Among them, the air passing groove 2a is partially arranged to the shoulder 2b above the second sealing ring 8.

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

[0043] Further, as shown in Figure 1 and Figure 2As shown, a pre-closing spring 9 is also 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 wall of the sealing mating hole 1b4, to form a seal, one end of the pre-closing spring 9 is suspended. Before the second sealing ring 8 separates from the inner wall of the valve body 1, both 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. This positioning can be achieved by directly fixing the two together. 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 lever 2 has a mounting hole 2c. The valve core 5 includes a circular head 5a and a columnar mating part 5b fixed to the upper side of the head 5a. The outer diameter of the mating part 5b is smaller than the outer diameter of the head 5a. The upper end of the mating part 5b is located inside the mounting hole 2c. The check spring 6 and the pre-closing spring 9 are both located inside the mounting hole 2c. The inner diameter of the pre-closing spring 9 is larger than the outer diameter of the check spring 6. The check spring 6 passes through the pre-closing spring 9. The first abutment surface 5c is the upper end surface of the mating part 5b. The upper end of the mating part 5b has a positioning hole 1 5b1. The control lever 2 also has a positioning hole 2d whose lower end opening communicates with the mounting hole 2c. The two ends of the check spring 6 are located inside the positioning hole 1 5b1 and the positioning hole 2d, respectively.

[0044] Under normal circumstances, such as Figure 1 As shown, the control lever 2 is in a high position, that is, in a state where the inlet 1a1 and the outlet 1a2 are connected. At this time, the second sealing ring 8 abuts against the wall of the sealing mating hole 1b4 to form a seal and block the air inlet 1b1 and the outlet 1a2. The two ends of the check spring 6 abut against the valve core 5 and the lower end of the control lever 2 respectively, but are not compressed, while the lower end of the pre-closing spring 9 is in a suspended state. The water entering from the inlet 1a1 is pushed open by the water pressure, overcoming the action of the check spring 6, and enters the water passage chamber 1a3 and then flows into the pipe from the outlet 1a2. If there is 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 press tightly against the blocking port 1a5, blocking the inlet 1a1 and the outlet 1a2. Under normal water flow conditions, the water pipe connected to the outlet 1a2 will not freeze because the water is constantly flowing.

[0045] When the user rotates the control lever 2 to move it downward along its center line, the second sealing ring 8, which is arranged on the outer circumferential side of the control lever 2, will move along with the control lever 2, and the lower end of the pre-closing spring 9 will also move downward along with the control lever 2. When the lower end of the pre-closing spring 9 comes into abutment with the valve core 5, the pre-closing spring 9 will start to act on the valve core 5 to press it against the blocking port la5 to block the water inlet (in practice, the pre-closing spring 9 is required to be not easily opened by the water pressure), that is, the frost-proof faucet is pre-closed before the control lever 2 is rotated to separate the second sealing ring 8 from the inner wall of the valve body 1. At this time, the frost-proof faucet has been pre-closed, that is, the valve core 5 cannot be opened by the water pressure, and the lower end of the control lever 2 can continue to move downward because it has not yet come into abutment with the valve core 5, and the frost-proof faucet is in the pre-closed state as shown in Fig. 1C. Continue to rotate the control lever 2 to move it downward, and after the second sealing ring 8 is separated from the hole of the sealing fitting hole lb4, and until the frost-proof faucet is in the fully closed state as shown in Fig. 1D, the upper part of the air passage 2a is located at the position of the annular air guide groove lb2, and the lower part of the air passage 2a is located at the water passage cavity la3, so that the external air enters the annular air guide groove lb2 from the air inlet holes lb1, and then enters the water outlet la2 through the air passages 2a, and under the action of air pressure, the water remaining in the water outlet la2 and the water remaining in the water pipe are discharged to prevent freezing due to water accumulation. Figure 4 Figure 5

[0046] Example Two

[0047] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in 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 fixed, the control lever 2 has a second abutment surface, and the second abutment surface has a spacing from the upper end of the pre-closing spring 9 when the second sealing ring 8 is in abutment with the inner wall of the valve body 1. The second abutment surface is the hole bottom surface of the mounting hole 2c (here, the hole bottom surface refers to the surface facing the hole of the mounting hole 2c).

[0048] Through the above arrangement, when the second sealing ring 8 is in abutment with the inner wall of the valve body 1, the second abutment surface has a spacing from 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 act when the frost-proof faucet is in the normal water outlet state and does not affect the normal movement of the valve core 5 under the action of the water inlet water pressure. When the second sealing ring 8 is separated from the inner wall of the valve body 1, the second abutment surface comes into abutment with the upper end of the pre-closing spring 9, so that the pre-closing spring 9 starts to act on the valve core 5 to pre-close the frost-proof faucet.

[0049] ​​The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A freeze-proof faucet, comprising a valve body (1) having a water inlet (1a1) and a water outlet (1a2), and a control lever (2) which is screwed to the valve body (1) and has its lower end located in the valve body (1), the control lever (2) being able to move along its center line and control the communication or blockage between the water inlet (1a1) and the water outlet (1a2) when it is rotated, characterized in that, The valve body (1) is provided with air inlet holes (1b1) on the outside, the lower end of the control rod (2) is provided with a second sealing ring (8) on the outer periphery, which abuts against the inner wall of the valve body (1), the second sealing ring (8) is located between the air inlet hole (1b1) and the water outlet (1a2), and when the control rod (2) controls the water inlet hole (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 makes the air inlet hole (1b1) communicate with the water outlet (1a2).

2. The freeze-proof faucet according to claim 1, wherein 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 several, and each air inlet hole (1b1) communicates with the annular air guide groove (1b2), and the outer periphery of the control rod (2) located in the valve body (1) is provided with a plurality of air passing grooves (2a) arranged in the axial direction of the control rod (2) in a strip shape, and the second sealing ring (8) is located below each air passing groove (2a).

3. The freeze-proof faucet according to claim 2, wherein The air inlet hole (1b1) is a blind hole, the hole opening of the air inlet hole (1b1) is arranged downward, and the annular air guide groove (1b2) communicates with the air inlet hole (1b1) laterally.

4. The freeze-proof faucet according to claim 3, wherein The valve body (1) has a water passing cavity (1a3) therein, the upper end of the valve body (1) has a threaded connection hole (1b3) for threaded connection of the control rod (2) and a sealing fitting hole (1b4) which is concentrically arranged with the threaded connection hole (1b3) and is a light hole, the annular air guide groove (1b2) is located inside the threaded connection hole (1b3), the sealing fitting hole (1b4) communicates with the water passing cavity (1a3), the hole diameter of the sealing fitting hole (1b4) is larger than that of the threaded connection hole (1b3), the lower end of the control rod (2) has a shoulder (2b) which can form a clearance fit with the sealing fitting hole (1b4) on the outer periphery, the outer periphery of the shoulder (2b) is provided with a mounting groove (2b1), and the second sealing ring (8) is arranged in the mounting groove (2b1).

5. The freeze-proof faucet according to claim 4, wherein The air passing groove (2a) is partially arranged to the shoulder (2b) above the second sealing ring (8).

6. The freeze-proof faucet according to claim 4, wherein The valve body (1) has a blocking port (1a5) in the water passing cavity (1a3), the lower end of the control rod (2) is slidingly connected with a valve core (5) along the center line direction, a check spring (6) is arranged in abutment between the valve core (5) and the lower end of the control rod (2), the valve core (5) abuts at the blocking port (1a5) under the action of the check spring (6), a pre-closing spring (9) is further 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) abuts against the inner wall of the valve body (1) to form a seal, and the two ends of the pre-closing spring (9) abut against the control rod (2) and the valve core (5) respectively before the second sealing ring (8) is separated from the inner wall of the valve body (1).

7. The freeze-proof faucet according to claim 6, wherein The upper end of the pre-closing spring (9) is positioned with the control rod (2), the valve core (5) has a first abutting surface (5c), and the first abutting surface (5c) has a spacing with the lower end of the pre-closing spring (9) when the second sealing ring (8) abuts against the inner wall of the valve body (1).

8. The freeze-proof faucet according to claim 6, wherein The lower end of the pre-closing spring (9) is positioned with the valve core (5), the control rod (2) has a second abutting surface, the second sealing ring (8) abuts with the inner wall of the valve body (1), and the second abutting surface has a spacing with the upper end of the pre-closing spring (9).

9. The freeze-proof faucet according to claim 7 or 8, wherein 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 fitting part (5b) fixed to the upper side of the head (5a), the upper end of the fitting part (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 freeze-proof faucet according to claim 9, wherein The upper end of the fitting part (5b) has a positioning hole one (5b1), the control rod (2) further has a positioning hole two (2d) which is in communication with the mounting hole (2c), and the two ends of the check spring (6) are respectively located in the positioning hole one (5b1) and the positioning hole two (2d).

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