CN212297859U

CN212297859U - Reversing valve

Info

Publication number: CN212297859U
Application number: CN202020569861.2U
Authority: CN
Inventors: 胡利荣; 彭东; 于兴义
Original assignee: Oceanwell Xiamen Industrial Co ltd
Current assignee: Oceanwell Xiamen Industrial Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2021-01-05
Anticipated expiration: 2030-04-16

Abstract

The utility model discloses a reversing valve, including valve body, valve rod, the valve rod set up in the valve body and be in divide out the lower air cock of cavity and being used for collecting the air in the valve body, be equipped with the gasbag in the epicoele, be equipped with on the valve body with the first air cock of going up of gasbag intercommunication, be equipped with on the valve body with air cock under first air cock of lower air cock intercommunication and the second, the sealing plug is connected the valve rod lower part with valve rod synchronous motion. Set up gasbag and lower air chamber in the switching-over valve to adjust the size of gasbag and lower air chamber through the vertical removal of valve rod, thereby the control sealing plug is opened or is closed first air cock down, utilizes gas pressure to control as the power supply, has simple structure, light in weight and low in manufacturing cost's advantage. Moreover, the functional components for adjusting the butt joint of the first upper air nozzle, the first lower air nozzle and the second lower air nozzle can be applied to different control valve bodies, and the function is strong.

Description

Reversing valve

Technical Field

The utility model relates to a switching-over valve especially relates to gas accuse formula switching-over valve, belongs to bathroom product pneumatic operation field.

Background

The reversing valve is applied to a water path control system in the field of water heating bathrooms and is used for controlling the on-off and reversing of a water path. Most of reversing valves control the switch action through the electromagnetic structure, namely the electromagnetic reversing valve adopts a large amount of electromagnetic elements, the structure is complex, although the performance is strong, for example, different water routes can be controlled simultaneously, the price is high and the fault is easy to occur, the requirement for the waterproof performance is high when the reversing valve is used in the water heating field (the main electromagnetic valve needs electricity, or the battery needs to be replaced regularly, or the alternating current brings potential safety hazard, energy is not saved, and the environment is protected). Some reversing valves adopt a mechanical valve core structure, and the water path is opened and cut off through the rotation or movement of the valve core, but the structure is not complicated by an electromagnetic valve, but has weak performance, can only control the on-off of a single water path (flexible connection cannot be realized), and the problems of large weight and high cost are not effectively solved because the structure still has improved space.

SUMMERY OF THE UTILITY MODEL

The utility model provides a reversing valve can be used to control different water routes, simple structure, light in weight, low in manufacturing cost moreover. The utility model provides a technical scheme that its technical problem adopted is:

reversing valve, including the valve body, still include the valve rod, the valve rod set up in the valve body and in divide out the lower air chamber of last cavity and being used for collecting the air in the valve body, thereby the valve rod can vertically slide and make go up cavity, lower air chamber realize the increase or reduce, be equipped with the gasbag in the epicoele, the gasbag bottom sprag is in on the valve rod, be equipped with on the valve body with the first air cock of going up of gasbag intercommunication, be equipped with on the valve body with air chamber intercommunication first air cock and second are down air cock down, still including being used for opening or closing the sealing plug of first air cock, the sealing plug is connected the valve rod lower part with valve rod synchronous movement, the vertical pressure of gasbag is in to the area on the valve rod is greater than the vertical pressure of lower air chamber is to the area of valve rod, thereby the valve rod is in the gasbag moves down and drives because the drive of gas pressure difference under the condition that the atmospheric pressure in the air chamber A lower air nozzle.

The reversing valve comprises a valve body and a valve rod, wherein the valve rod is arranged in the valve body and divides an upper air chamber and a lower air chamber for collecting air in the valve body, the valve rod can vertically slide so as to enlarge or reduce the upper air chamber and the lower air chamber, the valve body is provided with a first upper air nozzle and a second upper air nozzle which are communicated with the upper air chamber, the valve body is provided with a first lower air nozzle communicated with the lower air chamber and also comprises a sealing plug used for opening or closing the first lower air nozzle, the sealing plug is connected to the lower part of the valve rod and moves synchronously with the valve rod, the area of the upper air chamber for vertically pressing the valve rod is larger than the area of the lower air chamber for vertically pressing the valve rod, therefore, the valve rod moves downwards under the condition that the air pressures in the upper air chamber and the lower air chamber are equal due to the driving of the air pressure difference and drives the sealing plug to close the first lower air nozzle.

Compared with the background technology, the technical scheme has the following advantages:

the reversing valve is internally provided with an air bag (or an upper air chamber) and a lower air chamber, and the sizes of the air bag (or the upper air chamber) and the lower air chamber are adjusted through the vertical movement of the valve rod, so that the first lower air nozzle is controlled to be opened or closed by the control sealing plug, the air pressure is used as a power source for controlling, and the reversing valve has the advantages of simple structure, light weight and low manufacturing cost. And (current bathroom product pneumatic operation, stop single pneumatic start, do not realize the linkage) the functional unit of adjustment first air cock, second air cock butt joint, the switching of cooperation first air cock is opened or is closed, just can be applied to in the middle of the control valve body of difference, powerful.

For example, after a second upper air nozzle communicated with the air bag is arranged on the valve body, the first upper air nozzle is in butt joint with the inflating device, and the second upper air nozzle is communicated with a second lower air nozzle and is connected with a pneumatic control needle valve, so that the opening and closing of the pneumatic control needle valve can be controlled;

for example, after a second upper air nozzle communicated with the air bag is arranged on the valve body, the first upper air nozzle is in butt joint with the inflating device, the second upper air nozzle is communicated with a second lower air nozzle and is connected with the air control needle valve, and meanwhile, the first lower air nozzle is connected with the pressure release valve, so that the delayed closing of the air control needle valve can be controlled;

for example, after a third lower air nozzle communicated with the lower air chamber is arranged on the valve body, the first upper air nozzle is connected with the second lower air nozzle and is connected with the drain valve and the pressure release valve, meanwhile, the first lower air nozzle is connected with the water inlet valve, and the third lower air nozzle is in butt joint with the inflating device, so that the inflating device can be used for controlling the water inlet valve to firstly feed water, then the drain valve starts to delay drainage, and the water inlet valve finally stops feeding water after drainage is finished;

for example, after a second upper air nozzle communicated with the air bag is arranged on the valve body at the same time, the first upper air nozzle is in butt joint with the inflating device, the second upper air nozzle is communicated with the second lower air nozzle and then is connected with the drain valve, and meanwhile, the first lower air nozzle is connected with the pressure release valve and the water inlet valve, so that the drain valve can be controlled to be started firstly for draining, and the water inlet of the water inlet valve is started in a delayed manner;

for example, after a second upper air nozzle communicated with the air bag is arranged on the valve body, the first upper air nozzle is in butt joint with the inflating device, the second upper air nozzle is communicated with the second lower air nozzle and then is connected with the water discharging valve and the water inlet valve, and meanwhile, the first lower air nozzle is connected with the pressure release valve, so that the water discharging valve and the water inlet valve can be controlled to be started simultaneously, the opening time of the water inlet valve is advanced, and the air-conditioning valve is applied to occasions with special requirements.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic exploded view of a first embodiment of the reversing valve of the present invention.

FIG. 2 is a schematic perspective view of the reversing valve of FIG. 1.

FIG. 3 is a schematic cross-sectional view of the reversing valve of FIG. 1.

Fig. 4 is a schematic connection diagram of the reversing valve shown in fig. 1 applied to a first control system.

Fig. 5 is a schematic connection diagram of the reversing valve shown in fig. 1 applied to a second control system.

Fig. 6 is a schematic connection diagram of the reversing valve shown in fig. 1 applied to a third control system.

Fig. 7 is a schematic connection diagram of the reversing valve shown in fig. 1 applied to a fourth control system.

Fig. 8 is a schematic connection diagram of the reversing valve shown in fig. 1 applied to a fifth control system.

Figure 9 depicts a schematic cross-sectional view of a second embodiment of the reversing valve of the present invention.

Detailed Description

Referring to fig. 1 to 3, the reversing valve includes a valve body 10, a valve rod 20, and a sealing plug 30, the valve rod 20 is disposed in the valve body 10 and divides an upper chamber 11 and a lower chamber 12 for collecting and storing air, and the valve rod 20 can slide vertically to enlarge or reduce the upper chamber 11 and the lower chamber 12. An air bag 40 is arranged in the upper chamber 11, the bottom of the air bag 40 is supported on the valve rod 20, and the air bag 40 is also used for collecting and storing air. The valve body 10 is provided with a first upper nozzle 13 and a second upper nozzle 14 which are communicated with the air bag 40 (the second upper nozzle 14 is not necessary, for example, in the control system shown in fig. 6, if a pressure maintaining valve is not provided, the second upper nozzle may not be provided), and the valve body is provided with a first lower nozzle 15 and a second lower nozzle 16 which are communicated with the lower air chamber 12. The sealing plug is used for opening or closing the first lower air tap 15, and the sealing plug 30 is connected to the lower part of the valve rod 20 and moves synchronously with the valve rod. The area of the air bag 40 vertically pressing on the valve rod 20 is larger than the area of the lower air chamber 12 vertically pressing on the valve rod 20, that is, the area of the bottom surface of the air bag contacting with the valve rod is larger than the area of the top surface of the lower air chamber contacting with the valve rod, so that the valve rod 20 moves downwards and drives the sealing plug 30 to close the first lower air nozzle 15 when the air pressure in the air bag 40 and the lower air chamber 12 increases to a set value due to the driving of the air pressure difference. It will be appreciated that if the air bag 40 and the lower air chamber 12 are open to the atmosphere, and the pressure difference between the upper side and the lower side of the valve stem 20 is very small, the sealing plug 30 is not enough to seal the first lower air nozzle 15, and the gap between the sealing plug 30 and the first lower air nozzle 15 can pass through the air, so that the first lower air nozzle 15 is in an open state under normal atmosphere conditions.

Preferably, a spring 50 is further included, wherein the spring 50 is tensioned between the valve body 10 and the valve stem 20 and applies a vertical upward elastic force to the valve stem 20, and when the air bag 40 and the lower air chamber 12 are communicated with the external atmosphere, the elastic force of the spring 50 slightly pushes up the sealing plug 30 to open the first lower air tap 15. Thus, the lower air chamber 12 is slightly pressurized to easily open and lower air tap 15, and the switching of the diverter valve becomes more sensitive.

Preferably, the upper part of the valve rod 20 is of a cylinder structure with an open top surface and covers the air bag 40, the lower part is of a cylinder structure with an open bottom surface, and the sectional area of the upper part is larger than that of the lower part, so that the stress area of the valve rod 20 corresponding to the air bag 40 is larger than that of the lower air chamber 12. A sealing ring 60 is arranged between the outer wall of the lower part and the inner wall of the valve body 10, and the lower part and the valve body enclose the lower air chamber 12.

Preferably, the valve body 10 includes a valve housing 17 and an upper cover 18, the first lower nozzle 15 and the second lower nozzle 16 are disposed at the lower portion of the valve housing 17, the upper cover 18 covers the opening at the top end of the valve housing 17, and the first upper nozzle 13 and the second upper nozzle 14 are disposed at the upper cover 18. And a gas passing hole is formed in the side wall of the valve sleeve 17 and is positioned between the sealing ring 60 and the upper end surface of the valve rod 20. Therefore, in the vertical movement process of the valve rod, air in the interval between the top surface of the valve rod 20 and the sealing ring 60 is easily discharged or supplemented with air when passing through the air hole and is communicated with the atmosphere, so that the movement of the valve rod 20 cannot be influenced by air resistance, the air pressure of an air bag and the air pressure of a lower air chamber are stable, and the reversing valve is more sensitive.

Preferably, a third lower air nozzle 19 (shown in fig. 6) is disposed on the valve body 10 and is communicated with the lower air chamber 12. The provision of a third lower nozzle 19 may further add to the functionality of the diverter valve, as will be illustrated below.

Referring to fig. 4, in the case that the third lower nozzle 19 of the reversing valve is closed or not provided, the first upper nozzle 13 is butted with the inflating device 200, the second upper nozzle 14 is communicated with the second lower nozzle and is connected with the pneumatic needle valve 300, when the inflating device 200 inflates, the air bag 40 and the lower air chamber 12 are pressurized simultaneously and the pressure is equal, so that the sealing plug 30 moves downwards to close the first lower nozzle 15, the pneumatic needle valve 300 is opened under the driving of increased air pressure to realize pressure relief and drainage, which may be water discharged from a faucet or water discharged from a urinal, etc. When the exhaust device 200 returns, the pressure of the air bag 40 and the lower air chamber 12 simultaneously decreases, and the air control needle valve 300 is closed again. The structure and the working principle of the pneumatic control needle valve 300 are the prior art and are not described in detail.

Referring to fig. 5, in the case that the third lower nozzle 19 of the reversing valve is closed or not provided, the first upper nozzle 13 is butted with the inflating device 200, the second upper nozzle 14 is connected with the second lower nozzle 16 and then connected with the pressure maintaining valve 400 (the pressure maintaining valve may be omitted) and the air control needle valve 300, meanwhile, the first lower nozzle 15 is connected with the pressure relief valve 500, and the one-way valve 600 is provided at the outlet position of the second upper nozzle 14 to prevent air from flowing into the airbag 40 from the second upper nozzle 14. When the inflating device 200 inflates, the air bag 40, the lower air chamber 12 and the pressure stabilizing valve 400 are pressurized simultaneously, the first lower air nozzle 15 is closed by the sealing plug 30, and the air control needle valve 300 is driven by increased air pressure to be opened, so that pressure relief and drainage are realized. When the air exhausting device 200 returns air, the pressure of the air bag 40 is reduced, the air pressure in the lower air chamber 12 drives the valve rod 20 to move upwards, so that the first lower air nozzle 15 is opened, air in the air control needle valve 300 and the pressure stabilizing valve 400 flows back to the lower air chamber 12, air is exhausted from the pressure relief valve 500, after the air is exhausted, the air control needle valve 300 is closed again to stop water, and the delayed closing of the air control needle valve 300 is realized, namely the time length of water drainage is controlled. The structure can simplify the air pipeline and simplify the structure of the drainage system. The structures of the pressure maintaining valve 400 and the pressure relief valve 500 are also the prior art and are not described in detail.

Referring to fig. 6, in the case that the reversing valve is provided with a third lower nozzle 19, the second upper nozzle 14 is connected with the pressure maintaining valve 400 (the second upper nozzle and the pressure maintaining valve may be omitted), the first upper nozzle 13 and the second lower nozzle 16 are connected and then are connected with the drain valve 700 and the pressure relief valve 500, the one-way valve 600 is arranged at the outlet position of the second lower nozzle 16 to prevent air from flowing back to the lower air chamber, the first lower nozzle 15 is connected with the water inlet valve 800, and the third lower nozzle 19 is connected with the inflating device 200. When the inflating device 200 inflates, the pressure of the lower air chamber 12 is instantly increased and the first lower air nozzle 15 is opened, meanwhile, air enters the starting air bag of the water inlet valve 800 and drives the water inlet valve 800 to be opened to realize water inlet (after the air enters the starting air bag, the connecting rod on the buoy is pressed downwards, so that the back pressure switch of the water inlet valve is opened), the inflating device 200 continuously inflates, the pressure stabilizing valve 400, the air bag 40 and the water drain valve 700 are simultaneously pressurized, then the water drain valve is started to be opened to drain water (the air bag of the water drain valve expands to lift the pull rod to open the water outlet), after the air bag of the water drain valve 700 is pressurized, the valve rod 20 is driven to move downwards to. The inflating device 200 stops inflating, air in the pressure stabilizing valve 400, the air bag 40 and the drain valve 700 is gradually exhausted through the pressure relief valve 500, when the air pressure drops to a set value, the drain valve 700 closes the water drainage, the water inlet valve 800 starts the air pressure in the air bag to drive the sealing plug 30 to move upwards to open the first lower air nozzle 15, then the air is exhausted through the pressure relief valve 500, after the water inlet valve 800 starts the air bag to exhaust, the sealing plug 30 closes the first lower air nozzle 15 again, and the water inlet valve 800 controls the water inlet to stop by the rising of the buoy. The system simultaneously controls the starting of the water inlet valve 800 and the starting of the water discharge valve 700, the water inlet valve 800 firstly realizes water inlet, then the water discharge valve 700 starts water discharge, and after the water discharge is finished, the water inlet valve 800 is driven by the buoy of the water inlet valve 800 to stop water, so the system can be applied to a low-pressure water tank and improves the flushing force by the water inlet of the water inlet valve 800.

Referring to fig. 7, under the condition that the third lower nozzle 19 of the reversing valve is closed or not provided, the first upper nozzle 13 is in butt joint with the inflating device 200, the second upper nozzle 14 is connected with the second lower nozzle 16 and then is connected with the pressure maintaining valve 400 (the pressure maintaining valve can be omitted) and the drain valve 700, the one-way valve 600 is arranged at the outlet position of the second upper nozzle 14 to prevent air from flowing back into the air bag 40, and the first lower nozzle 15 is connected with the pressure relief valve 500 and the water inlet valve 800. When the inflating device 200 inflates, the sealing plug 30 closes the first lower air nozzle 15, the air bag 40, the lower air chamber 12, the pressure stabilizing valve 400 and the drain valve 700 are pressurized simultaneously, and when the set pressure is reached, the drain valve 700 is started to drain water (the drain valve air bag expands to lift the pull rod to open the water outlet). After the air inflating device 200 returns air, the pressure of the air bag 40 decreases, the air pressure of the lower air chamber 12 drives the valve rod 20 to move upwards to open the first lower air nozzle 15, the air of the pressure stabilizing valve 400 and the water discharging valve 700 enters the pressure releasing valve 500 and the water inlet valve 800, the limit of the float of the water inlet valve 800 is opened by the kinetic energy of the air (for example, the float is hooked by the hook, and after the hook is opened, the float falls to open the water inlet valve back pressure switch), and the water inlet valve 800 is started to realize water inlet. After the gas is gradually discharged, the drain valve 700 stops the water again. The system also controls the water inlet valve 800 and the drain valve 700 at the same time, and starts the drain valve 700 first, so that the unstable operation of the drain valve 700 caused by the impact of the water flow of the inlet water on the drain valve 700 after the water inlet valve 800 is opened can be prevented.

Referring to fig. 8, when the third lower nozzle 19 of the reversing valve is closed or not provided, the first upper nozzle 13 is connected with the inflating device 200 in a butt joint mode, the second upper nozzle 14 is connected with the second lower nozzle 16 and then connected with the pressure stabilizing valve 400, the drain valve 700 and the water inlet valve 800, the one-way valve 600 is arranged at the outlet position of the second upper nozzle 14 to prevent air from flowing back into the air bag 40, and the first lower nozzle 15 is connected with the pressure relief valve 500. When the inflating device 200 inflates, the sealing plug 30 closes the first lower air nozzle 15, the air bag 40, the lower air chamber 12, the pressure stabilizing valve 400, the drain valve 700 and the water inlet valve 800 are pressurized simultaneously, when the set pressure is reached, the drain valve 700 is started (the air bag of the drain valve expands to lift the pull rod to open the water outlet), the water inlet valve 800 is started (the air enters the starting air bag and then presses the connecting rod on the buoy downwards to open the back pressure switch of the water inlet valve), namely the water inlet valve 800 is started when the liquid level does not fall, and the starting time of the water inlet valve 800. After the air inflating device 200 returns air, the pressure of the air bag 40 decreases, the air pressure of the lower air chamber 12 drives the valve rod 20 to move upwards to open the first lower air nozzle 15, and the air of the pressure stabilizing valve 400, the drain valve 700 and the water inlet valve 800 enters the pressure release valve 500 for delayed air release. After the gas is gradually discharged, the water is stopped again by the drain valve 700, and the water inlet valve 800 is closed after the liquid level rises to a set height. The system controls the water inlet valve 800 and the water discharge valve 700 at the same time, and advances the opening time of the water inlet valve 800, and can be applied to a low-pressure water tank to increase the flushing force by means of the water inlet valve 800.

Referring to fig. 9, the second embodiment of the reversing valve of the present invention is different from the first embodiment in that: the valve stem 20 directly partitions the upper and

lower air chambers

70 and 12 for collecting air within the valve body 10, and the upper and

lower air chambers

70 and 12 are enlarged or reduced as the valve stem 20 vertically slides. (in practical application, a V-shaped sealing ring may be disposed at the joint of the valve housing 17 and the upper cover 18, so as to ensure the sealing performance of the upper air chamber). the upper air chamber 70 replaces the air bag in the first embodiment, and therefore, the first upper air nozzle 13 and the second upper air nozzle 14 (the second upper air nozzle may be omitted) are communicated with the upper air chamber 70. The area of the upper air chamber 70 vertically pressing on the valve rod 20 is larger than the area of the lower air chamber 12 vertically pressing on the valve rod 20, so that the valve rod moves downwards and drives the sealing plug to close the first lower air nozzle 15 under the driving of the air pressure difference when the air pressures in the upper air chamber and the lower air chamber are equal. The structure of the second embodiment can be applied to the control systems of fig. 4 to 8 instead of the structure of the first embodiment, and the corresponding control functions can be realized as well.

In addition, in order to increase the sealing performance of the upper air chamber 70, an upper sealing ring 80 is arranged between the outer wall of the upper part of the valve rod 20 and the inner wall of the valve body 10, and the upper air chamber 70 is directly enclosed by the upper part of the valve rod 20 and the valve body 10. Further, a sealing ring 90 is arranged between the upper cover 18 and the inner wall of the valve housing 17. In this embodiment, the air passing hole is located between the upper sealing ring 80 and the lower sealing ring 60, and the lower sealing ring 60 is a sealing ring between the lower portion of the valve rod 20 and the inner wall of the valve body 10.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. A reversing valve comprises a valve body, and is characterized in that: still include the valve rod, the valve rod set up in the valve body and divide out the lower air chamber of last cavity and being used for collecting the air in the valve body, thereby valve rod vertical slip makes go up cavity, lower air chamber and realize the increase or reduce, be equipped with the gasbag in the epicoele, the gasbag bottom sprag is in on the valve rod, be equipped with on the valve body with the first air cock of going up of gasbag intercommunication, be equipped with on the valve body with air chamber intercommunication first air cock and second air cock down still are used for opening or closing under the lower air cock the sealing plug of first air cock, the sealing plug is connected the valve rod lower part with valve rod synchronous movement, the gasbag is vertical to be pressed area on the valve rod is greater than the air chamber is vertical to be pressed down the area of valve rod.

2. The reversing valve of claim 1, wherein: the sealing plug is characterized by further comprising a spring, the spring is tensioned between the valve body and the valve rod and exerts vertical upward elastic force on the valve rod, and when the air bag and the lower air chamber are communicated with the outside atmosphere, the sealing plug is jacked up by the elastic force of the spring to open the first lower air nozzle.

3. The reversing valve according to claim 1 or 2, wherein: the upper part of the valve rod is of a cylinder structure with an opening on the top surface and sleeved on the air bag, the lower part of the valve rod is of a cylinder structure with an opening on the bottom surface, the sectional area of the upper part is larger than that of the lower part of the valve rod, a sealing ring is arranged between the outer wall of the lower part of the valve rod and the inner wall of the valve body, and the lower part of the valve rod and the valve body enclose.

4. The reversing valve of claim 3, wherein: the valve body comprises a valve sleeve and an upper cover, a first lower air nozzle and a second lower air nozzle are arranged at the lower part of the valve sleeve, the upper cover covers an opening at the top end of the valve sleeve, and the first upper air nozzle is arranged on the upper cover; and the side wall of the valve sleeve is provided with a gas passing hole, and the gas passing hole is positioned between the sealing ring and the upper end surface of the valve rod.

5. The reversing valve according to claim 1 or 2, wherein: the valve body is provided with a second upper air nozzle communicated with the air bag; and a third lower air nozzle communicated with the lower air chamber is arranged on the valve body.

6. A reversing valve comprises a valve body, and is characterized in that: still include the valve rod, the valve rod set up in the valve body and divide out the upper and lower air chamber that is used for collecting the air in the valve body, thereby valve rod vertical slip makes upper and lower air chamber realizes the increase or reduces, be equipped with on the valve body with go up the first air cock of going up of air chamber intercommunication, be equipped with on the valve body with air cock under first air cock of air chamber intercommunication and the second still including being used for opening or closing the sealing plug of first air cock, the sealing plug is connected the valve rod lower part with valve rod synchronous movement, it arrives to go up the vertical area of exerting pressure on the valve rod is greater than the vertical area of exerting pressure of air chamber is arrived down the area of valve rod.

7. The reversing valve of claim 6, wherein: the valve body is provided with a valve rod, the valve rod is provided with a sealing plug, the sealing plug is arranged in the valve body, the valve rod is arranged in the valve body, the spring is tensioned between the valve body and the valve rod and exerts vertical upward elastic force on the valve rod, and when the upper air chamber and the lower air chamber are communicated with the outside atmosphere, the sealing plug is jacke.

8. The reversing valve according to claim 6 or 7, wherein: the upper part of the valve rod is of a cylinder structure with an opening on the top surface, an upper sealing ring is arranged between the outer wall of the upper part and the inner wall of the valve body, and the upper part and the valve body enclose an upper air chamber; the lower part is of a cylinder structure with an opening at the bottom surface, a lower sealing ring is arranged between the outer wall of the lower part and the inner wall of the valve body, and the lower part and the valve body enclose a lower air chamber; and the cross-sectional area of the upper portion is greater than the cross-sectional area of the lower portion.

9. The reversing valve of claim 8, wherein: the valve body includes valve barrel and upper cover, and first air cock and second are located down the air cock the valve barrel lower part, the upper cover covers valve barrel top end opening, the upper cover with be equipped with the sealing ring between the valve barrel inner wall, first last air cock set up in the upper cover, be equipped with the gas pocket on the valve barrel lateral wall, it is located to cross the gas pocket between the upper and lower sealing washer.

10. The reversing valve according to claim 6 or 7, wherein: the valve body is provided with a second upper air nozzle communicated with the upper air chamber; and a third lower air nozzle communicated with the lower air chamber is arranged on the valve body.