CN203585436U

CN203585436U - Switch valve assembly, anti-freezing water feeding pipe device and station water supply system

Info

Publication number: CN203585436U
Application number: CN201320613372.2U
Authority: CN
Inventors: 韩志国
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-30
Filing date: 2013-09-30
Publication date: 2014-05-07
Anticipated expiration: 2023-09-30

Abstract

The utility model discloses a switch valve assembly, an anti-freezing water feeding pipe device and a station water supply system. A water inlet flow channel, a water outlet flow channel, a main flow channel, a three-way valve element, a main air valve, an auxiliary air valve, branch flow channels and a reset assembly are arranged in a valve body of the switch valve assembly. The three-way valve element triggers the auxiliary air valve when the water outlet flow channel is communicated to the main flow channel so as to enable the branch flow channels to be communicated to a first cavity to allow compressed air to enter the first cavity to act on the inner end face of a second piston, a first piston and the second piston are away from a compressed air inlet in the same direction, and partial compressed air flows out from the water outlet flow channel after entering the main flow channel. The second piston moves to trigger the reset assembly so as to drive the auxiliary air valve to reset to enable the branch flow channels to be communicated to a second cavity. When the acting force of compressed air in the second cavity to the outer end face of the second piston is larger than the acting force of the compressed air in the main flow channel to the first piston, the first piston enables the compressed air inlet to be closed. The switch valve assembly, the anti-freezing water feeding pipe device and the station water supply system are simple and safe in operation and stable and reliable in performance and lowers energy consumption.

Description

Switch valve component, anti-freezing water supply pipeline device and station water supply system

Technical Field

The utility model relates to a water supply system field of vehicle, concretely relates to prevent frostbite water supply pipe device, use switching valve subassembly on preventing frostbite water supply pipe and use water supply pipe device's station water supply system prevents frostbite.

Background

The water source storage is an important component of the railway passenger train, is one of essential basic conditions for passenger journey and life, and is an important aspect of humanized service of the passenger train. At present, the railway passenger car in China mostly adopts an on-board water storage tank for water source storage. Since the railway passenger car section has long running time and short stop time, the railway passenger car needs to supply water quickly when stopping at each stop of the railway section.

The water source supplement for the passenger train is carried out at the stop station of the passenger train by conveying water in a water well into a water storage tank of the passenger train through a water supply pipeline. The existing water supply pipelines are long in length, and when the existing water supply pipelines are in a low-temperature environment, residual liquid of the water supply pipelines can be frozen because the residual liquid is not removed in time, so that the water supply pipelines are blocked, and the water storage of a subsequent train is influenced.

In order to solve the problem that the water supply pipeline of the railway passenger car is blocked due to icing in the low-temperature environment, the water supply pipeline of the railway passenger car is tried to be solved by adopting three modes in the prior art, and the method specifically comprises the following steps:

the first mode is as follows: an electric tracing band is adopted. Namely, an electric tracing band is added on the water supply pipeline. However, the water supply pipe is a hose and is pulled frequently, the electric tracing band is very easy to be damaged, and only low-voltage power supply can be realized for preventing people from electric shock, and the electric energy loss of the low-voltage power supply is relatively large due to the long water supply pipe.

The second mode is as follows: an automatic pipe collecting device is adopted. The water supply pipeline adopts a rubber hose, and the rubber hose is automatically retracted into the water well after water is added into the passenger car. However, the softness of the rubber tube changes along with the change of the environmental temperature, and the rubber tube becomes hard in winter severe cold weather, so that the rubber tube cannot be retracted underground by the tube retracting device.

The third mode is as follows: and a compressed air circuit is controlled by adopting an electromagnetic valve, and residual liquid in the pipeline is removed by using compressed air. However, the electromagnetic valve has high requirements on working environment, so that the electromagnetic valve is easy to break down and has unstable working state. The requirement of the passenger car water supply on the stability of the equipment is extremely high, so the problem of icing of the water supply pipeline in a low-temperature environment cannot be well solved.

In view of the disadvantages of the above three solutions, the existing water supply pipeline adopts a long-flowing water mode to prevent the water supply pipeline from freezing in a low-temperature environment, that is, the existing water supply pipeline supplies water uninterruptedly. Because the water flows continuously, the water supply pipeline can not be frozen in a low-temperature environment. However, in the long-flow mode, continuous water supply is still needed when the passenger car does not need to store water, so that a great deal of waste of water resources is caused.

Therefore, the anti-freezing water supply pipeline device is needed to be provided, which can remove residual liquid in the pipeline in time and save water resources, has low requirements on working environment, and has stable and reliable performance and low operation and maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a can in time clear away remaining liquid, water economy resource in the pipeline, and have stable performance reliable, operation maintenance cost low prevents frostbite water supply pipe device.

According to an aspect of the utility model, a switch valve member is provided, including the valve body, the valve body includes:

the water inlet flow passage, the water outlet flow passage and the gas flow passage are respectively communicated with a water source, a water supply pipeline and a compressed gas source; the gas flow channel comprises a main flow channel and a branch flow channel;

the three-way valve core is used for selectively communicating the water outlet channel with the water inlet channel or the main channel;

the hollow cavity is communicated with a compressed gas source through a branch flow passage;

the main air valve comprises a main piston rod, a first piston and a second piston, wherein the first piston and the second piston are fixed at two ends of the main piston rod; the second piston is arranged in the hollow cavity, divides the hollow cavity into a first cavity and a second cavity and is provided with an inner end face and an outer end face which respectively face the first cavity and the second cavity;

the auxiliary air valve is arranged at the outlet of the branch flow passage and is used for enabling the branch flow passage to be selectively communicated with the first cavity or the second cavity;

the reset assembly is arranged between the main air valve and the auxiliary air valve and is connected to the auxiliary air valve through a connecting end;

when the three-way valve core enables the water outlet flow channel to be communicated with the main flow channel, the auxiliary air valve is triggered to enable the branch flow channel to be communicated with the first cavity, compressed gas is allowed to enter the first cavity to act on the inner end face of the second piston, the compressed gas acting on the inner end face of the second piston and the compressed gas acting on the first piston act in the same direction to push the first piston and the second piston to move away from the compressed gas inlet, and therefore part of the compressed gas is allowed to flow out of the water outlet flow channel after entering the main flow channel from the compressed air inlet;

when the acting force of the compressed gas in the second cavity on the outer end surface of the second piston is larger than the acting force of the compressed gas in the main flow channel on the first piston, the first piston moves towards the compressed gas inlet until the compressed gas inlet is closed.

The hollow cavity also comprises a switching cavity communicated with the outlet of the branch flow channel, the first cavity and the second cavity;

the auxiliary air valve comprises a third piston arranged in the switching cavity;

after the auxiliary gas valve is triggered by the three-way valve core, the third piston moves to a position between the outlet of the branch flow channel and the second cavity so as to prevent the compressed gas of the branch flow channel from entering the second cavity and allow the compressed gas of the branch flow channel to enter the first cavity and act on the inner end face of the second piston;

after the auxiliary gas valve is driven by the reset assembly to move reversely and reset, the third piston moves to a position between the outlet of the branch flow passage and the first cavity so as to prevent compressed gas of the branch flow passage from entering the first cavity and allow the compressed gas of the branch flow passage to enter the second cavity to act on the outer end face of the second piston.

Further, the auxiliary air valve also comprises an auxiliary piston rod with a first end and a second end,

when the three-way valve core enables the water outlet flow channel to be communicated with the main flow channel, the first end of the auxiliary air valve is triggered to enable the branch flow channel to be communicated with the first cavity, and compressed gas is allowed to enter the first cavity and act on the inner end face of the second piston;

the third piston is fixed to the second end of the auxiliary piston rod and is connected to one end of the reset assembly.

Preferably, the reset component comprises a lever, the lever is fixed in the second cavity through a hinge and comprises a free end and a connecting end connected with the auxiliary air valve, and the free end and the connecting end are positioned on two sides of the hinge;

when the first piston closes the compressed gas inlet, the free end of the lever is positioned on one side of the outer end face of the second piston and is not in contact with the outer end face of the second piston;

and in the process that the first piston and the second piston move away from the compressed gas inlet, the outer end surface of the second piston touches the free end of the lever and pushes the free end of the lever to move, so that the connecting end of the lever is linked to push the auxiliary gas valve to reset.

Wherein when the first piston closes the compressed gas inlet, the area of the region where the compressed air acts on the sealing face of the first piston is smaller than the area of the outer end face of the second piston.

Preferably, the first and second electrodes are formed of a metal,

the first cavity is internally provided with: the valve plug is arranged between the inlet of the first cavity and the inner end face of the second piston so as to allow compressed gas to enter the first cavity to act on the inner end face of the second piston and prevent the compressed gas from flowing backwards; the first spring is connected between the valve plug and the inner wall of the first cavity and is in a compressed state;

and/or

The second cavity is internally provided with: and the second spring is connected between the outer end face of the second piston and the inner wall of the second cavity and is in a compressed state.

The inner diameter of the branch flow channel is smaller than that of the main flow channel.

Preferably, the first and second electrodes are formed of a metal,

the pressure of the compressed gas is 0.3-0.4 MPa;

the three-way valve core is a spherical or cylindrical valve core;

the time from the time when the first piston allows the compressed gas to enter the main flow channel to the time when the compressed gas is prevented from entering the main flow channel is 8-20 seconds.

According to the utility model discloses an on the other hand still provides a water supply pipe device prevents frostbite, include:

a water supply pipeline communicated with a water source;

a gas supply conduit in communication with a source of compressed gas;

a water supply pipe; and

the aforementioned on-off valve assembly; wherein,

the water supply pipeline is communicated with the water inlet channel of the switch valve component; the gas supply pipeline is communicated with a gas channel of the switch valve component; the water supply pipeline is communicated with the water outlet flow channel of the switch valve component.

According to the utility model discloses a still provide a station water supply system in another aspect, including water source, compressed air source and aforementioned frostproofing water supply pipe device.

According to the above technical scheme, the utility model provides a switching valve subassembly can prevent the phenomenon of freezing in the water supply pipe effectively to have water economy resource, easy operation safety, stable performance are reliable and energy saving's advantage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art further embodiments and drawings can be derived from the embodiments shown in the drawings.

FIG. 1 shows a schematic construction of an on-off valve assembly;

FIG. 2a is a diagram illustrating a state in which a water source supplies water to a water supply pipe through an on-off valve assembly;

FIG. 2b shows the internal state of the on/off valve assembly after manual shut-off of the water supply and rotation of the three-way valve cartridge;

FIG. 2c is a diagram showing the gas flow path in the valve assembly;

FIG. 2d shows the first piston of the on/off valve assembly in a state preventing gas flow communication;

FIG. 3 is a graph showing the positional relationship between the mechanical interlock and the auxiliary piston rod in the auxiliary valve;

FIG. 4 shows a schematic diagram of the construction of the antifreeze feed pipe apparatus.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

The utility model discloses an inventor observes, under low temperature environment, utilizes compressed air's pressure in time to clear away the remaining liquid in the passenger train water supply pipe and can prevent well that the water supply pipe from freezing to reach the effect of preventing frostbite. However, the existing compressed air gas circuit is controlled by an electromagnetic valve, and the electromagnetic valve has high requirements on the working environment, and the water supply pipeline of the passenger car is in a severe environment, so that the working state of the compressed air gas circuit controlled by the electromagnetic valve is unstable. Therefore the utility model discloses an inventor sets up switch valve subassembly in the water supply line, and this switch valve subassembly utilizes compressed gas to clear away the residual liquid in the water supply line in the settlement time to self-closing compressed gas source after the settlement time, thereby prevent effectively that the water supply line from freezing, and not high, the easy operation safety, the stable performance reliability to the environmental requirement.

According to the utility model discloses an aspect provides a switch valve subassembly, including the valve body, the valve body includes into water runner, play water runner, gas flow way, three-way valve core, cavity, main air valve, supplementary pneumatic valve and reset assembly. Wherein,

the water inlet flow channel is communicated with a water source, the water outlet flow channel is communicated with a water supply pipeline, and the gas flow channel is communicated with a compressed gas source.

The gas flow passage includes a main flow passage and a branch flow passage.

The three-way valve core is used for selectively communicating the water outlet channel with the water inlet channel or the main channel; preferably, the three-way valve core is a spherical or cylindrical valve core.

the main air valve comprises a main piston rod, a first piston and a second piston, wherein the first piston and the second piston are fixed at two ends of the main piston rod; the second piston is arranged in the hollow cavity, divides the hollow cavity into a first cavity and a second cavity and is provided with an inner end face and an outer end face which respectively face the first cavity and the second cavity.

And the auxiliary air valve is arranged at the outlet of the branch flow passage and is used for selectively communicating the branch flow passage with the first cavity or the second cavity.

The time from the compressed gas entering the main flow channel to the compressed gas entering the main flow channel is allowed to be 8-20 seconds by the first piston.

Furthermore, the hollow cavity also comprises a switching cavity communicated with the outlet of the branch flow channel, the first cavity and the second cavity;

after the auxiliary air valve is triggered by the three-way valve core, the third piston moves to a position between the outlet of the branch flow channel and the second cavity so as to prevent compressed gas of the branch flow channel from entering the second cavity and allow the compressed gas of the branch flow channel to enter the first cavity and act on the inner end face of the second piston;

after the auxiliary gas valve is driven by the reset assembly to move reversely and reset, the third piston moves to a position between the outlet of the branch flow channel and the first cavity so as to prevent compressed gas of the branch flow channel from entering the first cavity and allow the compressed gas of the branch flow channel to enter the second cavity to act on the outer end face of the second piston.

Further, the auxiliary gas valve further comprises an auxiliary piston rod having a first end and a second end,

Preferably, the reset assembly of the present invention comprises a lever, the lever is fixed in the second cavity through a hinge, the lever comprises a free end and a connecting end connected with the auxiliary air valve, and the free end and the connecting end are located at two sides of the hinge;

in the process that the first piston and the second piston move away from the compressed gas inlet, the outer end face of the second piston touches the free end of the lever and pushes the free end of the lever to move, so that the connecting end of the lever is linked to push the auxiliary gas valve to reset.

Wherein when the first piston closes the compressed gas inlet, the area of the region where the compressed air acts on the sealing face of the first piston is smaller than the area of the outer end face of the second piston. When the first piston closes the compressed gas inlet, the pressure of the compressed air acting on the end surface of the first piston is the same as the pressure of the compressed air acting on the outer end surface of the second piston, and as the area of the area acting on the sealing surface of the first piston is smaller than the area of the outer end surface of the second piston, the acting force of the compressed air acting on the outer end surface of the second piston is larger than the pressure borne by the end surface of the first piston, the first piston can seal the compressed gas inlet of the main flow passage to prevent the compressed gas from entering the main flow passage.

Preferably, the first and second electrodes are formed of a metal,

and/or

Preferably, the first and second electrodes are formed of a metal,

the inner diameter of the branch flow passage is smaller than that of the main flow passage. The present invention provides a branch flow passage having an inner diameter which can be a maximum inner diameter, a minimum inner diameter, an average inner diameter, an inlet inner diameter, an outlet inner diameter, or the like.

The construction and operation of the switching valve assembly will now be described in detail with reference to the preferred embodiments.

Fig. 1 shows a schematic construction of a switching valve assembly. As shown in fig. 1, the switching valve assembly includes a valve body 10. The valve body 10 comprises a water inlet flow passage 101, a water outlet flow passage 102, a gas flow passage 103, a three-way valve core 104 with a spherical or cylindrical valve core, a hollow cavity, a main air valve, an auxiliary air valve and a reset assembly. Wherein,

the water inlet channel 101, the water outlet channel 102 and the gas channel 103 are respectively used for being communicated with a water source, a water supply pipeline and a compressed gas source.

The gas flow channel 103 includes a branch flow channel 105 and a main flow channel. In various embodiments of the present invention, the main flow channel preferably includes a horizontal flow channel 131 communicating with the compressed gas source and a vertical flow channel 132 communicating with the three-way valve element 104. The inner diameter of the horizontal flow passage 131 is equal to or smaller than the inner diameter of the vertical flow passage 132, and the outlet of the horizontal flow passage 131 communicates with the middle-lower portion of the vertical flow passage 132. The junction of the horizontal channel 131 and the vertical channel 132 can be regarded as a compressed gas inlet of the main channel.

The three-way valve core 104 comprises two interfaces and a bent flow passage communicated with the two interfaces. As a preferred embodiment, the bending angle of the bent flow channel is 90 degrees. The three-way spool 104 rotates relative to each other in two positions, a first position and a second position, within the valve body 10. When the water inlet channel 101 is at the first position, the water outlet channel 102 is communicated with the water inlet channel 101; in the second position, the outlet flow channel 102 is in communication with the gas flow channel 103. Through the rotation of the three-way valve core 104, the water outlet channel 102 is selectively communicated with the water inlet channel 101 or the gas channel 103. Of course, the bending angle of the bending flow channel in the three-way valve core 104 in this embodiment is only exemplary, and is not limited to the bending angle, and in an actual production process, the bending angle of the bending flow channel is determined according to the angle between the communication of the water inlet flow channel 101, the water outlet flow channel 102 and the gas flow channel 103 in the valve body 10.

The hollow chamber is communicated with a compressed gas source through a branch flow passage 105. In an embodiment of the present invention, the branch flow channel 105 may be directly connected to a compressed gas source; as a more preferable embodiment, the branch flow channel 105 may further communicate with the horizontal flow channel 131 in the main flow channel, which may reduce the number of holes on the surface of the valve body 10 and improve the strength of the valve body 10. Preferably, the inner diameter of the branch flow passage 105 in the present embodiment is smaller than the inner diameter of the horizontal flow passage 131.

The main air valve includes a main piston rod 106, and a first piston 107 and a second piston 108 fixed to both ends of the main piston rod 106. Wherein,

the first piston 107 is disposed at a compressed gas inlet in the main flow passage and blocks or allows the compressed gas to flow into the main flow passage with its sealing surface.

A second piston 108 is disposed in the hollow cavity and divides the hollow cavity into a first chamber 109 and a second chamber 110. The end face of the second piston facing the first cavity is defined as an inner end face, and the end face facing the second cavity is defined as an outer end face.

Preferably, the area of the inner end surface and the area of the outer end surface of the second piston 108 are equal. The area of the end face of the first piston 107 is smaller than the area of the outer end face of the second piston 108.

In various embodiments of the present invention, the first piston 107 is preferably disposed at a junction of the vertical flow passage 132 and the horizontal flow passage 131, and an outlet of the horizontal flow passage 131 is a compressed gas inlet of the main flow passage. The area of the end surface of the first piston 107 is larger than the area of the outlet of the horizontal flow passage 131. The outlet area of the horizontal flow passage 131 is the sealing surface area of the first piston 107. When the gas flow passage 103 and the water outlet flow passage 102 are not communicated, the end surface of the first piston 107 is attached to the end surface of the outlet periphery of the horizontal flow passage, and the area of the region acting on the sealing surface of the first piston 107 is smaller than the area of the outer end surface of the second piston, so that the acting force of the compressed air acting on the outer end surface of the second piston is larger than the pressure borne by the end surface of the first piston, and the first piston can seal the compressed gas inlet of the main flow passage to prevent the compressed gas from entering the main flow passage.

In the embodiment of the present invention, the hollow cavity preferably adopts an L-shaped cavity. Defining an L-shaped hollow cavity, the vertical portion is the second cavity 110, and the horizontal portion is the first cavity 109. Preferably, the second piston 108 is sleeved with a sealing ring towards the periphery of the first cavity 109 to seal the first cavity 109.

The opening of the hollow cavity is also provided with a switching cavity 111 which is communicated with the outlet of the branch flow passage, the first cavity and the second cavity.

The auxiliary air valve is disposed at an outlet of the branch flow passage 105, and is used for selectively communicating the branch flow passage 105 with the second chamber 110 or the first chamber 109.

In the embodiments of the present invention, as a preferred solution, the auxiliary air valve can make the branch flow channel 105 selectively communicate with the second cavity 110 or the first cavity 109, specifically:

the auxiliary gas valve comprises an auxiliary piston rod 112, a third piston 113 and a fourth piston 114, wherein the third piston 113 and the fourth piston 114 are fixed on the auxiliary piston rod 112, and the third piston 113 is arranged in the switching cavity 111. A first end of the auxiliary piston rod 112 extends to the three-way valve spool 104 and is triggered by the mechanical interlocking means of the three-way valve spool 104, and a third piston 113 is fixed to a second end of the auxiliary piston rod 112, the second end extending to the second chamber 110 and being connected to one end of the reset assembly. A gap is left between the third piston 113 and the fourth piston 114.

After the auxiliary gas valve is triggered by the three-way valve core 104, the third piston 113 moves to a position between the outlet of the branch flow passage and the second cavity to prevent the compressed gas of the branch flow passage from entering the second cavity and allow the compressed gas of the branch flow passage to enter the first cavity to act on the inner end surface of the second piston.

And the resetting component is arranged between the main air valve and the auxiliary air valve and is connected to the auxiliary air valve through a connecting end. In various embodiments of the present invention, the reset assembly preferably includes a lever 115. Wherein,

the lever 115 is pivotally fixed in the second chamber 110 and includes a connection end connected to the auxiliary valve and a free end. The free end and the connecting end are positioned at two sides of the pivot. The connecting end is connected to the second end of the auxiliary piston rod 112 extending into the second cavity 110, and the free end is disposed at the left end of the second piston 108 in the second cavity 110. The left end and the right end of the utility model are defined by the relative position in the diagram, which is only used for describing convenience and does not limit the setting direction of the free end of the lever.

The reset assembly in this embodiment is only exemplary, and it may also adopt a gear or other linkage components, as long as it can realize that the components that push the auxiliary piston rod to make the auxiliary air valve return to the position when not triggering in the moving process of the second piston 108 all fall into the protection scope of the present invention.

Further, the first cavity 109 has therein: a first spring 117 and a valve plug 118. Wherein,

the valve plug 118 is disposed between the inlet of the first cavity and the inner end surface of the second piston to allow compressed gas to enter the first cavity to act on the inner end surface of the second piston and prevent reverse flow of the compressed gas.

A first spring 117 is connected between the valve plug and the inner wall of the first chamber and is in a compressed state.

The second cavity 110 is provided with: a second spring 116 connected between the outer end face of the second piston and the inner wall of the second chamber and in a compressed state.

The operation of the switching valve assembly will be explained in detail with reference to the accompanying drawings.

FIG. 2a is a diagram illustrating a state in which a water source supplies water to a water supply pipe through an on-off valve assembly. As shown in fig. 2a, the three-way valve core 104 connects the inlet channel 101 and the outlet channel 102, and the water source delivers water to the water supply pipeline. At this time, the auxiliary air valve is in an unfired state. One part of the compressed gas acts on the outer end surface of the first piston 107 through the outlet of the horizontal flow passage, the other part of the compressed gas enters the second cavity 110 through the branch flow passage 105 and acts on the outer end surface of the second piston 108, and because the pressure of the compressed gas in the horizontal flow passage 131 and the second cavity 110 is the same, and the area of the region of the compressed gas acting on the sealing surface of the first piston 107 is smaller than that of the outer end surface of the second piston 108, the pressure on the outer end surface of the second piston 108 is larger than that on the end surface of the first piston 107, the first piston 107 in the main air valve blocks the outlet of the horizontal flow passage 131, namely the compressed gas inlet of the main flow passage, thereby preventing the compressed gas from entering the main flow passage.

After the water source conveying pipeline is manually closed (the operation is the same as the action of an original water supply valve for closing the water source conveying pipeline, and the operation difficulty is not increased), the three-way valve core 104 is rotated, and as shown in fig. 2b, the water outlet flow channel 102 is communicated with the main flow channel of the gas flow channel 103. At the same time, a mechanical interlocking device in the three-way valve core 104 triggers an auxiliary air valve, the auxiliary air valve enables the branch flow passage 105 to be communicated with the first cavity 109, and the second cavity 110 is closed. The compressed air in the branch flow passage 105 enters the first cavity 109 through a gap between the third piston 113 and the fourth piston 114, the intake flow passage 111, and acts on the inner end surface of the second piston. The first piston 107 is acted by the compressed gas in the horizontal flow channel 131, the second piston 108 is acted by the compressed gas in the first cavity 109, along with the increase of the air input and pressure of the compressed gas in the first cavity 109, the acting force of the first piston 107 and the second piston 108 is greater than the acting force of the compressed gas in the second cavity 110 on the second piston 108, the first piston 107 and the second piston 108 in the main air valve move towards the direction far away from the compressed gas inlet under the action of the same-direction acting force, so that the compressed gas inlet of the main flow channel is opened, the compressed gas enters the water supply pipeline through the main flow channel and the water outlet flow channel 102, and residual liquid in the water supply pipeline is removed.

During the movement of the second piston 108, the outer end surface of the second piston 108 triggers the free end of the lever 115 and pushes the free end of the lever 115 to move in the same movement direction as the second piston 108, so as to drive the auxiliary gas valve to reset, as shown in fig. 2c, at which time the gas flow passage is still open. When the auxiliary air valve returns to the position before triggering, the branch flow passage 105 is communicated with the second cavity, and the first cavity 109 loses pressure; since the volume of the second chamber is larger than that of the first chamber 109, the second chamber 110 needs to increase the amount of intake air in a period of time, when the amount of intake air in the second chamber 110 increases to a point where the force of the compressed gas on the second piston 108 is larger than that of the compressed gas in the main flow passage on the first piston 107, the compressed gas in the second chamber 110 pushes the second piston 108 to move towards the compressed gas inlet, and the first piston 107 moves towards the compressed gas inlet correspondingly under the linkage of the main piston rod 106 until the compressed gas inlet is closed, as shown in fig. 2 d.

In the embodiment, the pressure of the compressed gas adopted by the compressed gas source is within the pressure range of 0.3-0.4 MPa. The time from the compressed gas entering the main flow channel to the compressed gas entering the main flow channel is allowed to be 8-20 seconds by the first piston, namely the time for the main gas valve to be closed in a delayed mode is 8-20 seconds. Therefore, the on-off valve assembly realizes the functions of delaying and automatically closing the main air valve through the charging and discharging speed and the time difference formed by the pressure on the two sides of the second piston 108 of the main air valve.

Preferably, a compressed gas intake amount adjusting valve may be provided on the branch flow passage 105, and the time delay of the main valve may be realized by adjusting the compressed gas intake amount adjusting valve.

Fig. 3 shows a diagram of the position relationship between the mechanical interlock and the auxiliary piston rod in the auxiliary gas valve. As shown in fig. 3, the mechanical interlocking device is a toggle structure 301 disposed in the three-way valve core. After the water valve of the water source conveying pipeline is manually closed, the three-way valve core rotates by 90 degrees to enable the water outlet flow channel to be communicated with the gas flow channel, and at the moment, the plectrum structure 301 stirs the auxiliary piston rod of the auxiliary gas valve to enable the auxiliary gas valve to move to the position after triggering.

When the water valve is opened, the three-way valve core rotates reversely, the shifting piece structure 301 rotates but can not enable the auxiliary piston rod of the auxiliary air valve to move, when the three-way valve core rotates reversely by 90 degrees, the water source conveying pipeline is opened, and the water inlet flow channel is communicated with the water outlet flow channel. The auxiliary air valve resets under the action of the resetting component.

Through experimental detection, the switch valve assembly in the embodiment can blow dry residual liquid in a water supply pipeline of 30-40 meters within 8 seconds. The valve assembly consumes 30-50 liters of compressed gas with 0.3-0.4 MPa per operation, and the power consumption of the air compressor is checked to be less than 0.005 kwh/time, and the reduced electricity charge is less than 5 cm/time.

According to the technical scheme provided by the utility model, switching valve subassembly can prevent water supply pipe icing phenomenon effectively to have a great deal of advantages such as water economy resource, easy operation safety, stable performance are reliable and energy saving.

According to the utility model discloses a further aspect provides an use above-mentioned switching valve subassembly's frostproofing water supply line device. FIG. 4 shows a schematic diagram of the construction of the antifreeze feed pipe apparatus. As shown in fig. 4, the antifreeze feed pipe includes a water supply pipe 401 communicating with a water source, a gas supply pipe 402 communicating with a compressed gas source, a feed pipe 403, and an on-off valve assembly 404, wherein,

the water supply pipeline 401 is communicated with a water inlet flow channel of the switch valve component; the gas supply pipe 402 is communicated with a gas flow passage of the switch valve component; the water supply pipe 403 is communicated with the water outlet flow passage of the switch valve component.

The detailed structure of the switching valve assembly is not described herein.

According to the utility model discloses a still another aspect provides a station water supply system. The station water supply system comprises a water source and a compressed air source anti-freezing water supply pipeline device. By utilizing the anti-freezing water supply pipeline device, the station water supply system can normally supply water for the vehicles at the station in a low-temperature environment.

Compare with the current mode of the interior long flowing water of pipeline, the utility model discloses a can not only the water conservation, can also be convenient for pipeline maintenance and maintenance.

Station, can be for railway station, bus station or other vehicle stop places.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An on-off valve assembly comprising a valve body, the valve body comprising:

2. The switching valve assembly according to claim 1, wherein the hollow chamber further comprises a switching chamber communicating with the outlet of the branch flow passage, the first chamber and the second chamber;

3. The switching valve assembly of claim 2 wherein the auxiliary gas valve further comprises an auxiliary piston rod having a first end and a second end,

4. The switching valve assembly according to claim 1, wherein the reset assembly comprises a lever pivotally mounted in the second chamber, the lever comprising a free end and a connecting end connected to the auxiliary valve, the free end and the connecting end being disposed on opposite sides of the pivot;

5. The switching valve assembly according to claim 1,

when the first piston closes the compressed gas inlet, the area of the region where the compressed air acts on the sealing face of the first piston is smaller than the area of the outer end face of the second piston.

6. The switching valve assembly according to one of claims 1 to 5,

and/or

7. The switching valve assembly according to one of claims 1 to 5,

8. The switching valve assembly according to one of claims 1 to 5, comprising at least one of the following features:

the pressure of the compressed gas is 0.3-0.4 MPa;

the three-way valve core is a spherical or cylindrical valve core;

9. An anti-freeze water supply pipe apparatus, comprising:

a water supply pipeline communicated with a water source;

a gas supply conduit in communication with a source of compressed gas;

a water supply pipe; and

the on-off valve assembly of any one of claims 1 to 8; wherein,

10. A station water supply system characterized by comprising a water source, a compressed air source and the antifreeze water supply pipe apparatus as set forth in claim 9.