CN217056335U - Frost valve - Google Patents

Abstract

The utility model relates to an anti-freezing valve, which comprises a valve body, the front end of valve body is connected with the inlet tube, and the rear end is connected with the valve gap, the front end of inlet tube is connected with the front-end connection, be equipped with the disk seat of intaking in the front-end connection, be equipped with the valve rod in the valve body, the coaxial connecting pipe that is equipped with in the inlet tube, the rear end of connecting pipe stretches into in the valve body and with valve rod threaded connection, the front end of connecting pipe is connected with the valve clack assembly, the front end of valve clack assembly is equipped with into water sealing member, into water sealing member with the disk seat of intaking constitutes into water sealing pair, be equipped with out water interface and vacuum on the valve body and abolish the interface, the vacuum abolishes the interface mounting and abolishes the subassembly in the vacuum. The utility model discloses close the back at the valve, valve pocket in the valve body can pass through interface and atmosphere intercommunication are abolished in the vacuum, and the water of depositing in the inside and external outdoor water pipe of valve can automatic discharge, avoids leading to outdoor water pipe, valve even indoor water pipe to freeze the damage because of outdoor temperature crosses lowly.

Description

Frost valve

Technical Field

The utility model relates to an anti-freezing valve belongs to valve technical field.

Background

For outdoor water facilities, such as private garden watering, outdoor car washing, etc., water under pressure is stored in an outdoor water pipe (usually a hose), in winter, water in the hose freezes in most areas, and a part related to a valve and an indoor pipeline freezes due to heat transfer, which easily damages the hose, the valve, the indoor pipeline, etc.

SUMMERY OF THE UTILITY MODEL

For overcoming prior art's above-mentioned defect, the utility model provides an anti-icing valve, when its back of closing, the valve can be automatic discharges its inside deposit water with in the external outdoor water pipe, avoids crossing low because of outdoor temperature and causes outdoor water pipe, valve or even indoor water pipe to freeze the damage.

The utility model discloses realize that the technical scheme of above-mentioned purpose is: the utility model provides an anti-freezing valve, includes the valve body, the front end of valve body is connected with the inlet tube, and the rear end is connected with the valve gap, the front end of inlet tube is connected with the front connector, be equipped with the disk seat of intaking in the front connector, be equipped with the valve rod in the valve body, be equipped with the valve rod through-hole on the valve gap, the valve rod passes the valve rod through-hole, and with valve gap threaded connection, its outer end is installed and is used for rotatory manual piece, the coaxial connecting pipe that is equipped with in the inlet tube, the rear end of connecting pipe stretch into in the valve body and with valve rod threaded connection, the front end of connecting pipe is connected with the valve clack assembly, the front end of valve clack assembly is equipped with into water sealing member, into water sealing member with the disk seat of intaking constitutes into water sealing pair, be equipped with out water interface and the broken interface in vacuum on the valve body, the broken interface in vacuum is installed and is broken the subassembly in vacuum.

Preferably, the vacuum breaking interface is located at the top of the valve body, the vacuum breaking assembly comprises a joint, a sliding block and a protective cap, the joint is tubular and comprises a wide section located at the upper end and a narrow section located at the lower end, the narrow section is in threaded connection with the vacuum breaking interface, the wide section is located outside the vacuum breaking interface and is spaced from the vacuum breaking interface, the outer diameter of the wide section is larger than that of the vacuum breaking interface, an air inlet valve seat extending into the narrow section is coaxially arranged in the wide section, the outer diameter of the air inlet valve seat is smaller than that of the narrow section, an air inlet channel communicated with a medium channel of the air inlet valve seat is arranged at a connecting part between the wide section and the narrow section, the sliding block is located in the narrow section and is in clearance fit with the inner wall of the narrow section, the upper end of the sliding block is provided with an air inlet sealing piece, the air inlet sealing piece and the air inlet valve seat form an air inlet sealing pair, and the protective cap is connected to the top end of the wide-diameter section.

Preferably, the aperture of the air inlet of the vacuum breaking interface communicated with the valve body is smaller than the inner diameter of the narrow-diameter section.

Preferably, the sliding block is cylindrical, a plurality of supporting legs extending downwards are arranged at the bottom end of the sliding block, the supporting legs are evenly distributed along the circumference of the outer edge of the bottom end of the sliding block, a space is reserved between every two adjacent supporting legs, and the space between the outer wall of each supporting leg and the axis of the sliding block is larger than the radius of the cross section of the air inlet.

Further, the distance between the inner wall of each supporting leg and the axis of the sliding block is larger than the radius of the cross section of the air inlet.

Each of the legs may be a plastic (e.g., POM plastic) leg or a rubber leg.

Preferably, the air inlet sealing element is an annular rubber pad, an annular air inlet sealing element mounting groove is formed in the top surface of the sliding block, and the air inlet sealing element is embedded in the air inlet sealing element mounting groove.

Further, the outer diameter of the air inlet valve seat is smaller than the outer diameter of the sliding block and smaller than the outer edge diameter of the air inlet sealing element mounting groove, the inner edge diameter of the air inlet sealing element mounting groove is smaller than the inner diameter of the air inlet valve seat, and the top surface of the air inlet sealing element is higher than the top surface of the outer wall of the air inlet sealing element mounting groove.

Preferably, the outer wall of the bottom of the air inlet valve seat is a tapered surface with a gradually reduced outer diameter from top to bottom and/or the inner wall of the bottom of the air inlet valve seat is a tapered surface with a gradually expanded inner diameter from top to bottom.

Preferably, be equipped with a plurality of in the inlet tube the guide shaft cover of connecting pipe, a plurality of the guide shaft cover is in along axial evenly distributed in the inlet tube, the guide shaft cover is cross guide shaft cover.

Preferably, the valve flap assembly comprises a valve flap, a sleeve and a cylindrical spring, the sleeve is coaxially positioned in the water inlet pipe, the outer diameter of the sleeve is smaller than the inner diameter of the water inlet pipe, the inner diameter of the sleeve is matched with the outer diameter of the connecting pipe, the front end of the connecting pipe is inserted into the rear end of the sleeve and fixedly connected with the rear end of the sleeve, the valve flap is positioned at the front end of the sleeve and coaxially provided with a cylindrical extension section which extends backwards, the outer diameter of the extension section is smaller than the inner diameter of the sleeve and is inserted into the sleeve from the front end of the sleeve, the rear end of the extension section and the inner wall of the front part of the sleeve are provided with a limiting structure which is matched with each other and prevents the extension section from being separated from the sleeve, the inner wall of the rear part of the sleeve is provided with an annular flange which extends inwards in the radial direction, the cylindrical spring is positioned in the sleeve, the front end of the cylindrical spring is abutted against the end wall of the rear end of the extension section, and the rear end of the annular flange, the water inlet sealing piece is fixedly arranged on the front end face of the valve clack.

Preferably, the water inlet sealing element is a rubber pad, a water inlet sealing element mounting groove is formed in the front end face of the valve clack, and the water inlet sealing element is embedded in the water inlet sealing element mounting groove.

Furthermore, a backward screw hole is formed in the front end of the valve clack along the axis of the valve clack, a matched screw is arranged in the screw hole, the water inlet sealing piece is annular, and the screw penetrates through a central through hole of the water inlet sealing piece to be in threaded connection with the screw hole, so that the water inlet sealing piece is installed and fixed on the valve clack.

Furthermore, the outer diameter of the water inlet valve seat is smaller than the outer diameter of the valve clack and smaller than the inner diameter of the water inlet sealing element mounting groove, the outer diameter of the head of the screw is smaller than the inner diameter of the valve seat, and the front end face of the water inlet sealing element protrudes forwards out of the water inlet sealing element mounting groove.

Preferably, the section of the side wall of the rear part of the water inlet valve seat is in the shape of an arc with a backward arc top, or the outer wall of the rear part of the water inlet valve seat is a conical surface with a gradually reduced outer diameter from front to back and/or the inner wall of the rear part of the water inlet valve seat is a conical surface with a gradually enlarged inner diameter from front to back.

Preferably, the limiting structure comprises an annular limiting boss which is arranged at the rear end of the extending section and protrudes radially outwards, and an annular limiting flange which is arranged on the inner wall of the front part of the sleeve and protrudes radially inwards, the extending section and the annular limiting flange are in sliding clearance fit, and the outer diameter of the annular limiting boss is smaller than the inner diameter of the sleeve and larger than the inner diameter of the annular limiting flange.

Preferably, the front joint is an elbow.

Furthermore, the water inlet valve seat is positioned in a straight section of the elbow, which is coaxial with the water inlet pipe.

Preferably, a gasket which protrudes outwards in the radial direction is arranged on the outer wall of the water inlet pipe.

The beneficial effects of the utility model are that:

(1) the utility model discloses after the valve is closed, the valve body with the pressure reduction in the inlet tube, the slider is in under the effect of atmospheric pressure the joint is inside to slide down, the sealing member that admits air with the separation of inlet valve seat, make the valve pocket in the valve body communicate with external atmosphere, the deposit water in the valve inside and the external outdoor water pipe can be discharged automatically, avoid causing outdoor water pipe, valve or even indoor water pipe to freeze and damage because outdoor temperature is low excessively, even deposit water in the outdoor water pipe does not discharge thoroughly, because deposit water in the valve discharges cleanly, also can form air blocking between deposit water in the outdoor water pipe and indoor water pipe, can effectively avoid causing the condition that valve and indoor water pipe freeze and damage jointly when freezing in the outdoor water pipe;

(2) the utility model can complete the closing of the water inlet end of the valve and the discharging of the water stored in the valve simultaneously by one operation in the opening state of the valve, saves time and labor in operation, and can effectively avoid freezing and freezing the valve and the water pipe due to forgetting to discharge the water stored in the valve after the outdoor water is used in the low-temperature environment;

(3) the utility model discloses work as when the play water end of the outdoor water pipe of play water interface connection was closed, valve (end of intaking) was not closed the valve body with under the water pressure effect in the intake pipe, the valve clack can move forward, will the sealing member top of intaking forms sealedly on the intake valve seat, can effectively prevent the valve body with water refluence in the intake pipe.

Drawings

Fig. 1 is a schematic sectional structure diagram of the present invention.

Detailed Description

All directional indicators (e.g., upper, lower, front, rear, top, bottom, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a certain specific posture (as shown in the drawings), and do not constitute the limitation of the actual use direction, and if the specific posture is changed, the directional indicator is changed accordingly.

Referring to fig. 1, the utility model discloses an anti-freezing valve, mainly used connect indoor water pipe and outdoor water pipe, including valve body 1, the front end (the water inlet side) of valve body is connected (for example the welding) and is had inlet tube 2, the inlet tube is the straight tube, the rear end of valve body is connected (for threaded connection usually) and is had valve cap 3, the front end of inlet tube is connected (threaded connection or adopts the nut fastening connection) and has front connector 4, be equipped with inlet valve seat 5 in the front connector, inlet valve seat's medium passageway with the inlet tube is coaxial, be equipped with valve rod 6 in the valve body, be equipped with the valve rod through-hole on the valve cap, the valve rod passes the valve rod through-hole, and with valve cap threaded connection, its outer end is installed and is used for rotatory manual piece 7, for example handle or hand wheel. The water inlet valve is characterized in that a connecting pipe 8 is coaxially arranged in the water inlet pipe, the outer diameter of the connecting pipe is smaller than the inner diameter of the water inlet pipe, an annular cavity between the connecting pipe and the water inlet pipe forms a water flow channel in the water inlet pipe, the rear end of the connecting pipe extends into the valve body and is coaxially in threaded connection with the valve rod, the front end of the connecting pipe is connected with a valve clack assembly, a water inlet sealing piece 9 is arranged at the front end of the valve clack assembly, the water inlet sealing piece and the water inlet valve seat form a water inlet sealing pair, and the water inlet sealing piece is tightly pressed on the water inlet valve seat in a normal state (in a valve closing state). The valve body is provided with a water outlet port 10 and a vacuum breaking port 11, and the vacuum breaking port is provided with a vacuum breaking assembly. When the antifreezing valve is used, the antifreezing valve is generally horizontally installed on a wall of a house, the front connector is located indoors and is used for connecting an indoor water pipe (a water supply pipe), the valve body is located outdoors, and an outdoor water pipe (a water pipe, such as a hose) is connected through the water outlet interface.

The vacuum breaking interface is usually positioned at the top of the valve body, the vacuum breaking assembly preferably comprises a joint 12, a sliding block 13 and a protective cap 14, the joint is tubular and comprises a wide section positioned at the upper end and a narrow section positioned at the lower end, the wide section is coaxial with the narrow section, an internal thread is arranged in the vacuum breaking interface, an external thread matched with the narrow section is arranged on the outer wall of the narrow section, the narrow section is in threaded connection with the vacuum breaking interface, the wide section is positioned outside the vacuum breaking interface, a space is reserved between the bottom end of the wide section and the vacuum breaking interface, the outer diameter of the wide section is larger than that of the vacuum breaking interface, an air inlet valve seat 15 extending into the narrow section is coaxially arranged in the wide section, the outer diameter of the air inlet valve seat is smaller than the inner diameter of the narrow section, and a medium channel of the air inlet valve seat is coaxial with the narrow section, the wide footpath section with connecting portion between the narrow footpath section be equipped with the inlet channel of the medium passageway intercommunication of inlet valve seat, the slider is located in the narrow footpath section, and with clearance sliding fit between the inner wall of narrow footpath section, the upper end of slider is equipped with inlet seal 16, inlet seal with the inlet valve seat constitutes inlet seal pair, under the frost valve is in the open mode, the valve pocket of valve body with there is rivers to pass through in the inlet tube, the slider will under hydraulic effect inlet seal props up on the inlet valve seat, forms sealedly, prevents that the water of valve from breaking the interface outflow in the vacuum. The helmet is connected the top of wide footpath section is used for the shutoff the top mouth of wide footpath section, the helmet with can adopt threaded connection's mode to connect between the wide footpath section, also can adopt the mode of joint to connect.

The vacuum breaking interface with the setting of vacuum breaking subassembly works as the back is closed to the frost valve (the end of intaking is closed, intake valve seat with the sealing member that intakes is sealed), the valve body with pressure reduction in the intake pipe, because the medium passageway of intake valve seat passes through intake passage and atmosphere intercommunication, the slider is in under the effect of atmospheric pressure the slip downwards in the joint, intake sealing member with the intake valve seat separates, makes valve pocket and external atmosphere intercommunication in the valve body, and the water of depositing in the valve inside and external outdoor water pipe can be discharged from the play water end of outdoor water pipe automatically, avoids leading to outdoor water pipe, valve or even indoor water pipe freezing damage because of outdoor temperature is low excessively. Even if the water of depositing in the outdoor water pipe is not discharged thoroughly, because the water of depositing in the valve discharges totally, also can form the air between the indoor water pipe and the water of depositing in the outdoor water pipe and block, can effectively avoid causing the condition that valve and indoor water pipe freeze and damage to take place jointly when freezing in the outdoor water pipe.

The aperture of the air inlet 17 communicated with the valve body through the vacuum breaking interface is preferably smaller than the inner diameter of the narrow-diameter section, so that the sliding block is prevented from entering the valve cavity of the valve body except under the atmospheric pressure.

The sliding block is preferably cylindrical, a plurality of supporting legs 18 extending downwards are arranged at the bottom end of the sliding block, the supporting legs are evenly distributed along the circumference of the outer edge of the bottom end of the sliding block, a space is reserved between every two adjacent supporting legs, the space between the outer wall of each supporting leg and the axis of the sliding block is larger than the radius of the cross section of the air inlet, and further, the space between the inner wall of each supporting leg and the axis of the sliding block is larger than the radius of the cross section of the air inlet. With the arrangement, when the sliding block moves downwards under the action of atmospheric pressure and abuts against the upper end wall of the air inlet, air can enter the valve cavity of the valve body through the air inlet through the space between the adjacent support legs.

Each of the legs may be a plastic (e.g., POM plastic) leg or a rubber leg, which avoids damage due to frequent collision or contact with the upper end wall of the air inlet under atmospheric pressure.

The air inlet sealing piece is preferably an annular rubber pad, an annular air inlet sealing piece installing groove is formed in the top surface of the sliding block, and the air inlet sealing piece is embedded in the air inlet sealing piece installing groove. The outer diameter of the air inlet valve seat is smaller than the outer diameter of the sliding block and smaller than the outer edge diameter of the air inlet sealing element mounting groove, the inner edge diameter of the air inlet sealing element mounting groove is smaller than the inner diameter of the air inlet valve seat, and the top surface of the air inlet sealing element is preferably higher than the top surface of the outer wall of the air inlet sealing element mounting groove. So set up, admit air the sealing member can with the effective contact is realized to the terminal surface of the disk seat that admits air, guarantees sealed effect.

The bottom outer wall of the air inlet valve seat is a conical surface with a gradually reduced outer diameter from top to bottom and/or the bottom inner wall of the air inlet valve seat is a conical surface with a gradually enlarged inner diameter from top to bottom, so that the wall thickness of the bottom end of the air inlet valve seat is relatively small, the contact part of the air inlet sealing element and the bottom end of the air inlet valve seat is downwards sunken under the water pressure in the valve body (in an anti-freezing valve opening state), and the air inlet sealing element covers the bottom wall (a narrow annular surface) of the air inlet valve seat, so that the sealing effect is improved.

Preferably be equipped with a plurality of in the intake pipe the guide shaft cover 19 of connecting pipe, a plurality of the guide shaft cover is in along axial evenly distributed in the intake pipe, it is right the connecting pipe plays support and guide effect, the preferred cross guide shaft cover of guide shaft cover can be right the connecting pipe plays support and guide effect, does not influence rivers again and passes through. The guide sleeve is preferably made of plastic, for example POM plastic.

The valve flap assembly preferably comprises a valve flap 20, a sleeve 21 and a cylindrical spring 22, the sleeve is coaxially positioned at the front part in the water inlet pipe, the outer diameter of the sleeve is smaller than the inner diameter of the water inlet pipe, the inner diameter of the sleeve is matched with the outer diameter of the connecting pipe, the front end of the connecting pipe is inserted into the rear end of the sleeve and fixedly connected (for example welded), the valve flap is coaxially positioned at the front end of the sleeve, a cylindrical extension section 23 which extends backwards is coaxially arranged, the outer diameter of the extension section is smaller than the inner diameter of the sleeve and is inserted into the sleeve from the front end of the sleeve, a limit structure which is matched with the extension section and prevents the extension section from falling off from the sleeve is arranged on the rear end of the extension section and the inner wall of the front part of the sleeve, an annular flange which extends radially inwards is arranged on the inner wall of the rear part of the sleeve, the cylindrical spring is positioned in the sleeve, and the front end of the cylindrical spring is abutted against the end wall of the extension section, the rear end is propped against or connected to the annular flange, and the water inlet sealing piece is fixedly arranged on the front end face of the valve clack.

The water inlet sealing piece is preferably a rubber pad, a water inlet sealing piece mounting groove is formed in the front end face of the valve clack, and the water inlet sealing piece is embedded in the water inlet sealing piece mounting groove.

The front end of the valve clack is preferably provided with a backward screw hole along the axis of the valve clack, the screw hole is provided with a matched screw 24, the water inlet sealing element is annular, and the screw penetrates through a central through hole of the water inlet sealing element to be in threaded connection with the screw hole, so that the water inlet sealing element is fixedly installed on the valve clack. The external diameter of the water inlet valve seat is smaller than the external diameter of the valve clack and smaller than the internal diameter of the water inlet sealing piece mounting groove, the external diameter of the head of the screw is smaller than the internal diameter of the valve seat, and the front end face of the water inlet sealing piece preferably protrudes forwards to form the water inlet sealing piece mounting groove. So set up, the sealing member of intaking can with the effective contact is realized to the terminal surface of the disk seat of intaking, guarantees sealed effect.

The cross section of the rear side wall of the water inlet valve seat is preferably in an arc shape with the arc top facing backwards, or the outer wall of the rear part of the water inlet valve seat is in a conical surface with the outer diameter gradually reduced from front to back and/or the inner wall of the rear part of the water inlet valve seat is in a conical surface with the inner diameter gradually expanded from front to back. So set up, the rear end wall thickness of intake valve seat is less relatively under cylindrical spring's thrust and/or under the water pressure in the intake pipe, the sealing member that intakes with the contact site of the rear end of intake valve seat is sunken backward, the cladding of the sealing member that intakes is lived the rear end wall (narrower anchor ring) of intake valve seat improves sealed effect.

The limiting structure preferably comprises a radially outward protruding annular limiting boss arranged at the rear end of the extending section and a radially inward protruding annular limiting flange arranged on the inner wall of the front portion of the sleeve, the extending section is in sliding clearance fit with the annular limiting flange, and the outer diameter of the annular limiting boss is smaller than the inner diameter of the sleeve and larger than the inner diameter of the annular limiting flange. Therefore, when the valve clack moves forwards for a certain distance relative to the sleeve, the front end face of the annular limiting boss abuts against the rear end face of the annular limiting flange, and the extension section is prevented from being separated from the sleeve.

The extension section can be the tube-shape, perhaps, the valve clack be equipped with a plurality of extension piece that stretches out backward, a plurality of the extension piece is followed the rear end outer fringe circumference evenly distributed of valve clack is adjacent leave the interval between the extension piece, the cross section of extension piece is the arc, the radian with the radian of the rear end outer fringe circumference of valve clack is the same, by a plurality of the extension piece constitutes the extension section.

The front joint is preferably an elbow, and is convenient to be connected with an indoor water pipe. The water inlet valve seat is positioned in a straight section of the elbow, which is coaxial with the water inlet pipe.

The outer wall of the water inlet pipe is preferably provided with a gasket 25 protruding outwards in the radial direction, so that the antifreezing valve can be conveniently positioned on a wall body when being installed.

The connection or relative movement part of each part of the antifreezing valve is provided with a sealing ring or a sealing gasket according to the prior art so as to ensure the sealing effect.

The utility model discloses a theory of operation and working process do: the valve is opened by rotating the hand piece, the connecting pipe drives the sleeve pipe to move backwards, the valve clack moves backwards (the extension section slides backwards in the sleeve pipe) under the action of water pressure in the indoor water pipe, the water inlet sealing piece is separated from the water inlet valve seat, water from the indoor water pipe enters the valve cavity in the valve body through the water inlet pipe and then enters the outdoor water pipe through the water outlet interface, the water is discharged from the water outlet end (usually connected with a spray head or a spray nozzle) of the outdoor water pipe for use, the sliding block pushes the air inlet sealing piece against the air inlet valve seat under the action of the water pressure in the valve cavity of the valve body, and the water in the valve body cannot flow out of the vacuum breaking interface. When the water outlet end of the outdoor water pipe is closed and the valve is not closed through the manual piece, the water pressure in the water inlet pipe rises, the valve clack is pushed forwards (the extension section slides forwards in the sleeve) until the water inlet sealing piece is pressed against the water inlet valve seat, and a non-return seal is formed to prevent water in the valve from flowing backwards. When the water outlet end of the outdoor water pipe is not closed but the valve is directly closed by rotating the hand piece, the sleeve is driven by the connecting pipe to move forwards, the valve clack moves forwards under the thrust action of the cylindrical spring (the extension section slides forwards in the sleeve) until the water inlet sealing piece is pressed on the water inlet valve seat to form sealing, the valve is closed to feed water, the pressure in the water inlet pipe and the valve body is reduced, the medium channel of the air inlet valve seat is communicated with the atmosphere through the air inlet channel, the slide block slides downwards in the joint under the action of the atmospheric pressure, the air inlet sealing piece is separated from the air inlet valve seat, the valve cavity in the valve body is communicated with the outside atmosphere, and the water stored in the valve door and the water stored in the outdoor water pipe are automatically discharged from the water outlet end of the outdoor water pipe.

The preferred and optional technical means disclosed in the present invention, except for the specific description and the further limitation that one preferred or optional technical means is another technical means, can be combined at will to form a plurality of different technical solutions.

Claims (10)

1. An anti-freezing valve, which comprises a valve body and is characterized in that the front end of the valve body is connected with a water inlet pipe, the rear end is connected with a valve cover, the front end of the water inlet pipe is connected with a front joint, a water inlet valve seat is arranged in the front joint, a valve rod is arranged in the valve body, a valve rod through hole is arranged on the valve cover, the valve rod passes through the valve rod through hole and is in threaded connection with the valve cover, a manual piece for rotation is arranged at the outer end of the valve body, a connecting pipe is coaxially arranged in the water inlet pipe, the rear end of the connecting pipe extends into the valve body and is in threaded connection with the valve rod, the front end of the connecting pipe is connected with a valve clack assembly, the front end of the valve clack assembly is provided with a water inlet sealing element, the water inlet sealing piece and the water inlet valve seat form a water inlet sealing pair, the valve body is provided with a water outlet port and a vacuum breaking port, and the vacuum breaking port is provided with a vacuum breaking assembly.

2. The antifreeze valve of claim 1, wherein said vacuum breaking port is located at a top portion of said valve body, said vacuum breaking assembly includes a joint, a slider and a cap, said joint is tubular and includes a wide section at an upper end and a narrow section at a lower end, said narrow section is threaded into said vacuum breaking port, said wide section is located outside said vacuum breaking port with a space therebetween, said wide section has an outer diameter larger than that of said vacuum breaking port, said wide section has an inlet valve seat coaxially located therein and extending into said narrow section, said inlet valve seat has an outer diameter smaller than that of said narrow section, a connecting portion between said wide section and said narrow section has an inlet passage communicating with a medium passage of said inlet valve seat, said slider is located in said narrow section and is in clearance fit with an inner wall of said narrow section, the upper end of the sliding block is provided with an air inlet sealing piece, the air inlet sealing piece and the air inlet valve seat form an air inlet sealing pair, and the protective cap is connected to the top end of the wide-diameter section.

3. The antifreeze valve of claim 2, wherein the diameter of the gas inlet port of said vacuum breaking port communicating with said valve body is smaller than the inner diameter of said narrow diameter section.

4. The antifreeze valve of claim 3, wherein said slide is cylindrical, and has a bottom end provided with a plurality of legs extending downward, said plurality of legs being uniformly distributed along the circumference of the outer periphery of the bottom end of said slide, and a space being provided between adjacent legs, and the space between the outer wall of each leg and the axis of said slide being larger than the radius of the cross section of said air inlet.

5. The antifreeze valve according to claim 4, wherein said air inlet packing is an annular rubber packing, and an annular air inlet packing installation groove is provided on a top surface of said slider, and said air inlet packing is fitted in said air inlet packing installation groove.

6. The antifreeze valve according to claim 5, wherein the bottom outer wall of said intake valve seat is tapered from top to bottom in outer diameter and/or the bottom inner wall of said intake valve seat is tapered from top to bottom in inner diameter.

7. The antifreeze valve according to claim 1, 2, 3, 4, 5 or 6, wherein the valve flap assembly comprises a valve flap, a sleeve and a cylindrical spring, the sleeve is coaxially disposed in the water inlet pipe, the outer diameter of the sleeve is smaller than the inner diameter of the water inlet pipe, the inner diameter of the sleeve is matched with the outer diameter of the connecting pipe, the front end of the connecting pipe is inserted into the rear end of the sleeve and fixedly connected, the valve flap is disposed at the front end of the sleeve, a cylindrical extension section which extends rearward is coaxially disposed, the outer diameter of the extension section is smaller than the inner diameter of the sleeve and is inserted into the sleeve from the front end of the sleeve, a limit structure which is matched with the sleeve and prevents the extension section from falling out of the sleeve is disposed at the rear end of the extension section and the front inner wall of the sleeve, an annular flange which extends radially inward is disposed at the rear inner wall of the sleeve, and the cylindrical spring is disposed in the sleeve, the front end of the water inlet sealing piece is abutted against the rear end wall of the extension section, the rear end of the water inlet sealing piece is abutted against the annular flange, and the water inlet sealing piece is fixedly arranged on the front end face of the valve clack.

8. The antifreeze valve of claim 7, wherein the water inlet seal is a rubber pad, and a water inlet seal installation groove is provided on the front end surface of the valve flap, and the water inlet seal is fitted in the water inlet seal installation groove.

9. The antifreeze valve according to claim 8, wherein the rear side wall of said inlet valve seat has a circular arc shape with a backward arc top, or the rear outer wall of said inlet valve seat has a tapered surface with a gradually decreasing outer diameter from front to back and/or the rear inner wall of said inlet valve seat has a tapered surface with a gradually increasing inner diameter from front to back.

10. The antifreeze valve of claim 9, wherein said front joint is an elbow.

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