Air-operated reversing valve

Abstract

The present invention discloses a gas-controlled reversing valve, comprising a valve body and a valve stem, wherein the valve stem is arranged in the valve body and divides an upper chamber and a lower air chamber for collecting air in the valve body, wherein an air bag is arranged in the upper chamber, wherein the bottom of the air bag is supported on the valve stem, wherein a first upper air nozzle connected to the air bag is arranged on the valve body, wherein a first lower air nozzle and a second lower air nozzle connected to the lower air chamber are arranged on the valve body, and wherein a sealing plug and a spring for opening or closing the first lower air nozzle are also included, wherein under normal conditions, the spring drives the valve stem to move upward so that the sealing plug closes the first lower air nozzle. An air bag and a lower air chamber are arranged in the reversing valve, and the size of the air bag and the lower air chamber is adjusted by the vertical movement of the valve stem, thereby controlling the sealing plug to open or close the first lower air nozzle, and utilizing gas pressure as a power source for control, and having the advantages of simple structure, light weight and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to a reversing valve, in particular to a pneumatically controlled reversing valve, and belongs to the field of pneumatic operation of sanitary products. Background Art

[0002] Directional valves are used in water control systems in the field of plumbing and sanitary ware to control the on / off and reversing of waterways. Most reversing valves use electromagnetic structures to control the on / off action, that is, electromagnetic reversing valves, which use a large number of electromagnetic components and have a complex structure. Although they have strong performance, such as being able to control different waterways at the same time, they are expensive and prone to failure. They also have high requirements for waterproof performance when used in the field of plumbing (mainly because electromagnetic valves require electricity, and batteries must be replaced regularly, or AC power brings safety hazards and is not energy-saving or environmentally friendly). Some reversing valves also use a mechanical valve core structure to open and cut off the waterway by rotating or moving the valve core. Although this structure is not as complex as the electromagnetic valve, its performance is also weak, and it can often only control the on / off of a single waterway (there is no way to achieve flexible connection), and there is still room for improvement in the structure, and the problems of heavy weight and high cost have not been effectively solved. Summary of the invention

[0003] The present invention provides a pneumatically controlled reversing valve which can be used to control different waterways and has a simple structure, light weight and low manufacturing cost. The technical solution adopted by the present invention to solve the technical problem is:

[0004] The air-controlled reversing valve comprises a valve body and a valve stem, wherein the valve stem is arranged in the valve body and divides the valve body into an upper chamber and a lower air chamber for collecting air, the valve stem can slide vertically to increase or decrease the upper chamber and the lower chamber, an air bag is arranged in the upper chamber, the bottom of the air bag is supported on the valve stem, a first upper air nozzle connected to the air bag is arranged on the valve body, a first lower air nozzle and a second lower air nozzle connected to the lower air chamber are arranged on the valve body, and the valve body also comprises a sealing plug and a spring for opening or closing the first lower air nozzle, the sealing plug is connected to the lower part of the valve stem and moves synchronously with the valve stem, the area of ​​the air bag vertically pressing on the valve stem is larger than the area of ​​the lower air chamber vertically pressing on the valve stem, and under normal circumstances, the spring drives the valve stem to move upward so that the sealing plug closes the first lower air nozzle.

[0005] The air-controlled reversing valve comprises a valve body and a valve stem. The valve stem is arranged in the valve body and divides the upper and lower air chambers for collecting air into the valve body. The valve stem can slide vertically to increase or decrease the upper and lower air chambers. The valve body is provided with a first upper air nozzle connected to the upper air chamber, and the valve body is provided with a first lower air nozzle and a second lower air nozzle connected to the lower air chamber. The valve body also comprises a sealing plug and a spring for opening or closing the first lower air nozzle. The sealing plug is connected to the lower part of the valve stem and moves synchronously with the valve stem. The area of ​​the upper air chamber vertically pressing on the valve stem is larger than the area of ​​the lower air chamber vertically pressing on the valve stem. Under normal circumstances, the spring drives the valve stem to move upward so that the sealing plug closes the first lower air nozzle.

[0006] Compared with the background technology, this technical solution has the following advantages:

[0007] An air bag (or upper air chamber) and a lower air chamber are arranged in the reversing valve, and the size of the air bag (or upper air chamber) and the lower air chamber is adjusted by the vertical movement of the valve stem, thereby controlling the sealing plug to open or close the first lower air nozzle, and using gas pressure as a power source for control, which has the advantages of simple structure, light weight and low manufacturing cost. Moreover, (the existing pneumatic operation of sanitary ware products remains at single pneumatic start, and linkage is not achieved) the functional components for adjusting the docking of the first upper air nozzle, the first lower air nozzle, and the second lower air nozzle, in conjunction with the switching opening or closing of the first lower air nozzle, can be applied to different control valve bodies, and the function is powerful.

[0008] For example, after the third lower air nozzle connected to the lower air chamber is provided on the valve body, the first upper air nozzle is connected to the second lower air nozzle and both are connected to the water inlet valve. At the same time, the first lower air nozzle is connected to the drain valve and the pressure relief valve, and the third lower air nozzle is connected to the air pumping device. In this way, the air pumping device can be used to control the water inlet valve to first let in water, and then the drain valve starts delayed drainage, thereby increasing the flushing kinetic energy of the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] Figure 1 A schematic diagram of the air-controlled reversing valve of the present invention closing the first lower air nozzle is depicted.

[0011] Figure 2 A schematic diagram of the air-controlled reversing valve of the present invention opening the first lower air nozzle is depicted.

[0012] Figure 3 Draws Figure 1 The diagram shown is a connection diagram of the air-controlled reversing valve used in a water control system.

[0013] Figure 4 A schematic diagram of the structural deformation of the air-controlled reversing valve is drawn. DETAILED DESCRIPTION

[0014] Please refer to Figure 1 and Figure 2 The reversing valve comprises a valve body 10, a valve stem 20, and a sealing plug 30. The valve stem 20 is arranged in the valve body 10 and divides the upper chamber 11 and the lower air chamber 12 for collecting and storing air in the valve body. The valve stem 20 can slide vertically so as to increase or decrease the upper chamber 11 and the lower air chamber 12. An air bag 40 is arranged in the upper chamber 11, and the bottom of the air bag 40 is supported on the valve stem 20. The air bag 40 is also used to collect and store air. The valve body 10 is provided with a first upper air nozzle 13 connected to the air bag 40, and the valve body 10 is provided with a first lower air nozzle 15 and a second lower air nozzle 16 connected to the lower air chamber 12. The sealing plug 30 is used to open or close the first lower air nozzle 15. The sealing plug 30 is connected to the lower part of the valve stem 20 and moves synchronously with the valve stem. When the valve stem 20 moves upward, the sealing plug 30 blocks the first lower air nozzle 15, and when the valve stem 20 moves downward, the first lower air nozzle is opened. The valve stem 20 is also provided with a spring 50. Under normal conditions, the spring 50 drives the valve stem 20 to move upward so that the sealing plug 30 closes the first lower air nozzle 15. That is, under normal conditions, the first lower air nozzle 15 is in a closed state. The area of ​​the valve stem 20 vertically pressed by the airbag 40 is larger than the area of ​​the valve stem 20 vertically pressed by the lower air chamber 12, that is, the area of ​​the bottom surface of the airbag in contact with the valve stem is larger than the area of ​​the top surface of the lower air chamber in contact with the valve stem. Therefore, when the air pressure in the airbag 40 and the lower air chamber 12 is equal (for example, when the same air source is introduced and the air pressure increases to a set value), the driving force of the two on the valve stem 20 is different, so the valve stem 20 can be controlled to overcome the elastic force of the spring and move downward and open the first lower air nozzle 15. It can be understood that if the airbag 40 and the lower air chamber 12 are connected to the atmosphere, the pressure difference between the upper and lower sides of the valve stem 20 is very small, which is not enough to overcome the elastic force of the spring 50, so that the first lower air nozzle 15 remains closed.

[0015] When the first upper air nozzle 13 and the second lower air nozzle 16 are connected to different functional components, such as a water inlet valve and a water discharge valve, the opening and closing of the water inlet valve and the water discharge valve can be controlled in linkage.

[0016] Preferably, 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 .

[0017] Preferably, the sealing plug 30 includes a column body 32 and a head 34 connected to the bottom of the column body, the column body 32 passes through the first lower gas nozzle 15, and the head 34 is located below the first lower gas nozzle 15. Further, a mutually matching sealing surface (opposing inclined surfaces) is provided between the head 34 and the first lower gas nozzle 15, so that the 34 can more reliably seal the first lower gas nozzle 15.

[0018] Preferably, the upper part of the valve stem 20 is a tube structure with an opening on the top surface and covers the airbag 40, and the lower part is a tube structure with an opening on the bottom surface, and the cross-sectional area of ​​the upper part is larger than the cross-sectional area of ​​the lower part, so as to ensure that the force-bearing area corresponding to the valve stem 20 and the airbag 40 is larger than the force-bearing area corresponding to the lower air chamber 12. A sealing ring 60 is provided 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.

[0019] Preferably, the valve body 10 includes a valve sleeve 17 and an upper cover 18, the first lower air nozzle 15 and the second lower air nozzle 16 are arranged at the lower part of the valve sleeve 17, the upper cover 18 covers the top opening of the valve sleeve 17, and the first upper air nozzle 13 is arranged on the upper cover 18. An air hole is arranged on the side wall of the valve sleeve 17, and the air hole is located between the sealing ring 60 and the upper end surface of the valve stem 20. In this way, during the vertical movement of the valve stem, the air in the interval between the top surface of the valve stem 20 and the sealing ring 60 can be easily discharged or replenished through the air hole and communicated with the atmosphere, so that the movement of the valve stem 20 will not be affected by air resistance, the air pressure of the airbag and the lower air chamber is stable, and the reversing valve is more sensitive.

[0020] Preferably, the valve body 10 is provided with a third lower air nozzle 19 (such as Figure 3 The third lower air nozzle 19 is reserved to further increase the functionality of the reversing valve, as will be described below by way of example. In addition, the valve body 10 may also be provided with a second upper air nozzle connected to the air bag 40. The number of air nozzles connected to the air bag or the lower air chamber may be increased or decreased according to the number and position of the functional components to be connected.

[0021] Also refer to Figure 3 When the reversing valve is provided with the third lower air nozzle 19, the first upper air nozzle 13 is communicated with the second lower air nozzle 16 and is connected to the water inlet valve 800, the first lower air nozzle 15 is connected to the drain valve 700, the pressure relief valve 500, and the pressure regulating valve 400 (the pressure regulating valve can be omitted), the third lower air nozzle 19 is connected to the inflation device 200, and a one-way valve 600 is provided at the outlet position of the first lower air nozzle 15 to prevent the gas from flowing back to the lower air chamber 12.

[0022] When the air-inflating device 200 inflates, the pressure in the lower air chamber 12 increases instantaneously to ensure that the sealing plug 30 still closes the first lower air nozzle 15, and at the same time, air enters the starting airbag of the water inlet valve 800 and drives the water inlet valve 800 to open and let in water (after the air enters the starting airbag, it presses the connecting rod on the float downward, thereby opening the back pressure switch of the water inlet valve); the air-inflating device 200 continues to inflate, and the air pressure in the airbag 40 continues to increase and finally equals the air pressure in the lower air chamber 12, and the pressure difference between the airbag 40 and the lower air chamber 12 on the valve stem 20 drives the valve stem 20 to move downward and open the first lower air nozzle 16, and the air-inflating device 200 replenishes air to the pressure-stabilizing valve 400 and the drain valve 700 to increase the pressure, and then the airbag of the drain valve 700 reaches the set pressure and the drain valve starts to open for drainage (the drain valve airbag expands and lifts the pull rod to open the water outlet), and at the same time, the gas will also be slowly discharged from the pressure relief valve 500.

[0023] After the air is returned to the air-inflating device 200, the starting airbag of the water inlet valve 800 contracts and no longer restricts the connecting rod of the float, and the water inlet valve 800 enters a normal working mode. For example, when the water level rises to the set value, the water inlet valve automatically closes, and the pressure in the airbag and the lower air chamber drops. The spring 50 drives the valve stem 20 upward again to allow the sealing plug 30 to close the first lower air nozzle 16. In addition, the airbag and the pressure-stabilizing valve 400 of the drain valve 700 are slowly depressurized by the pressure relief valve 500, thereby extending the closing time of the drain valve 700. After the airbag of the drain valve 700 contracts, the drain valve 700 is closed to drain water.

[0024] The system controls the start of the water inlet valve 800 and the drain valve 700 at the same time, and the water inlet valve 800 first lets in water, and then the drain valve 700 starts to delay drainage. Since the timing of opening the water inlet valve 800 is advanced, the flushing force can be enhanced by relying on the water inlet of the water inlet valve 800, and is applied to low-pressure water tanks.

[0025] Please refer to Figure 4 , schematic diagram of the structural deformation of the air-controlled reversing valve, the difference is that: the valve stem 20 directly divides the upper air chamber 70 and the lower air chamber 12 for collecting air in the valve body 10, and the upper air chamber 70 and the lower air chamber 12 increase or decrease as the valve stem 20 slides vertically. (In specific implementation, a V-shaped sealing ring can be provided at the connection between the valve sleeve 17 and the upper cover 18, so that the sealing of the upper air chamber can be ensured) The upper air chamber 70 replaces the air bag 40 mentioned above, so the first upper air nozzle 13 (there may also be a second upper air nozzle) is connected to the upper air chamber 70. The area of ​​the upper air chamber 70 vertically pressing on the valve stem 20 is larger than the area of ​​the lower air chamber 12 vertically pressing on the valve stem 20, so that when the air pressure in the upper and lower air chambers is equal, the valve stem moves downward due to the driving of the gas pressure difference and drives the sealing plug 30 to open the first lower air nozzle 15. This structure can be applied to Figure 3 In the control system, the corresponding waterway control function can also be realized.

[0026] In addition, in order to increase the sealing performance of the upper air chamber 70, an upper sealing ring 80 is provided between the outer wall of the upper part of the valve stem 20 and the inner wall of the valve body 10, and the upper air chamber 70 is directly surrounded by the upper part of the valve stem 20 and the valve body 10. Further, a sealing ring 90 is provided between the upper cover 18 and the inner wall of the valve sleeve 17. In this structure, the air hole is located between the upper sealing ring 80 and the lower sealing ring 60, and the lower sealing ring 60 is the sealing ring between the lower part of the valve stem 20 and the inner wall of the valve body 10.

[0027] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A pneumatically controlled reversing valve, comprising a valve body, characterized in that: The vent valve is provided with a spring which is adapted to move the valve stem upwards and into contact with the valve body to release the vent valve, the vent valve is provided with a spring which is adapted to move the valve stem upwards and into contact with the valve body to release the vent valve.

2. The gas-controlled reversing valve according to claim 1, characterized in that: The sealing plug includes a column body and a head connected to the bottom of the column body, the column body passes through the first lower air nozzle, and the head is located below the first lower air nozzle; a sealing surface that cooperates with each other is provided between the head and the first lower air nozzle.

3. The gas-controlled reversing valve according to claim 1 or 2, characterized in that: The upper part of the valve stem is a tube structure with an opening on the top surface and covers the airbag, and the lower part is a tube structure with an opening on the bottom surface, and the cross-sectional area of ​​the upper part is larger than that of the lower part. A sealing ring is provided between the outer wall of the lower part and the inner wall of the valve body, and the lower part and the valve body form the lower air chamber.

4. The air-controlled reversing valve according to claim 3, characterized in that: The valve body includes 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 the top end opening of the valve sleeve, and the first upper air nozzle is arranged on the upper cover; an air hole is provided on the side wall of the valve sleeve, and the air hole is located between the sealing ring and the upper end surface of the valve stem.

5. The gas-controlled reversing valve according to claim 1 or 2, characterized in that: The valve body is provided with a second upper air nozzle communicating with the air bag, and / or the valve body is provided with a third lower air nozzle communicating with the lower air chamber.

6. A pneumatically controlled reversing valve, comprising a valve body, characterized in that: The vent valve is provided with a spring which is adapted to move the valve stem upward and the spring is adapted to move the valve stem in a direction of rotation relative to the vent valve.

7. The air-controlled reversing valve according to claim 6, characterized in that: The sealing plug includes a column body and a head connected to the bottom of the column body, the column body passes through the first lower air nozzle, and the head is located below the first lower air nozzle; a sealing surface that cooperates with each other is provided between the head and the first lower air nozzle.

8. The air-controlled reversing valve according to claim 6 or 7, characterized in that: The upper part of the valve stem is a cylindrical structure with an opening on the top surface, an upper sealing ring is provided between the outer wall of the upper part and the inner wall of the valve body, and the upper part and the valve body form the upper air chamber; the lower part is a cylindrical structure with an opening on the bottom surface, a lower sealing ring is provided between the outer wall of the lower part and the inner wall of the valve body, and the lower part and the valve body form the lower air chamber; and the cross-sectional area of ​​the upper part is greater than that of the lower part.

9. The gas-controlled reversing valve according to claim 8, characterized in that: The valve body includes 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 the top end opening of the valve sleeve, a sealing ring is arranged between the upper cover and the inner wall of the valve sleeve, the first upper air nozzle is arranged on the upper cover, an air hole is arranged on the side wall of the valve sleeve, and the air hole is located between the upper and lower sealing rings.

10. The air-controlled reversing valve according to claim 6 or 7, characterized in that: The valve body is provided with a second upper air nozzle communicating with the upper air chamber, and / or the valve body is provided with a third lower air nozzle communicating with the lower air chamber.

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