CN215806514U - Main air inlet and outlet valve with adjustable initial air displacement and full-function air valve with main air inlet and outlet valve - Google Patents

Abstract

The utility model discloses a main air inlet and outlet valve with adjustable initial air displacement, which comprises a first valve body, a first cover body and a valve core assembly, wherein the first cover body is covered above the first valve body and is provided with a large-caliber air inlet and outlet, and the valve core assembly is hung on the first cover body; the valve core assembly comprises a valve rod and a valve core, the valve rod is fixedly arranged on the first cover body through a valve core support, the other end of the valve rod extends into the valve cavity of the main intake and exhaust valve, and the valve core is movably connected to the valve rod and can slide along the valve rod; under the initial state, the valve core and the large-caliber air inlet and outlet form a gap for air inlet and outlet under the coordination of self gravity and upward acting force of the valve rod, the size of the gap is adjustable, the air exhaust requirements of water pipelines with different diameters can be met, and the application range is wide. The utility model also discloses a full-function air valve with the main air inlet and outlet valve, which can realize multi-stage air exhaust under the positive pressure state of internal air and high-speed air supplement under the negative pressure state.

Description

Main air inlet and outlet valve with adjustable initial air displacement and full-function air valve with main air inlet and outlet valve

Technical Field

The utility model relates to the technical field of pipeline valves, in particular to a main air inlet and outlet valve with adjustable initial air displacement and a full-function air valve with the same.

Background

The air valve is used as a functional valve, the performance and the reliability of the air valve are different from those of a conventional valve, and the correct type selection of the air valve is related to whether the air valve has the functions of safety protection, energy conservation and consumption reduction. The whole quality of the domestic air valve is not high, the function recognition degree of the air valve is not high for some domestic users, the air valve is not used by some users even based on the optional heart states in the use process, when the air valve breaks down, the maintenance valve below the exhaust valve is turned off, the air valve becomes a decoration, and great hidden danger is brought to the safety of a pipeline. Under the current situation, domestic air valves are not objectively applied, so that the market of the air valves is uneven, and the value is difficult to reflect. With the rapid development of water conservancy and hydropower engineering in China, the problems of exposure in the operation process of a water conveying pipeline are more and more, and the following problems mainly exist:

1. the micro exhaust valve does not work or the exhaust volume is too low

The trace exhaust valve can not work, which means that the trace exhaust valve can not exhaust the pressure air accumulated under the pressure-maintaining working condition in the pipeline; the reason that the exhaust volume is too low is that the pressure air accumulated under the pressure-holding working condition of the pipeline cannot be completely discharged due to the small exhaust flow area of the micro exhaust valve, and the accumulated air is more and more.

2. The pressure exhaust opening pressure of the micro exhaust valve is low

The pressure exhaust opening pressure of the micro exhaust valve is low, which means that the pressure for opening and exhausting the micro exhaust valve is lower than the working condition pressure of the system, so that the micro exhaust valve cannot be normally opened for exhausting. The micro exhaust valve cannot exhaust the air accumulated under the pressure-maintaining working condition of the pipeline, namely the micro exhaust valve is almost out of service.

3. Air valve sealing water leakage

Mainly has the air valve low pressure seal water leakage, high pressure seal water leakage, seal failure to cause water leakage, etc.

4. Foreign matter causes the jamming of the first sealing ring position of the air valve

When negative pressure appears in the pipeline, the air valve admits a large amount of air, and when the air valve becomes the exhaust state from the tonifying qi state, water and debris in the pipeline get into the air valve intracavity, arouse the gas vent to seal the card and hinder, appear the air valve phenomenon of leaking.

5. Low air supplement quantity of air valve

The air supply amount is the volume of air supplied into the pipeline by the air valve in unit time. The air supplement amount is low, and when negative pressure is generated in the pipeline, air cannot be supplemented quickly, the negative pressure cannot be eliminated, and the safety of the pipeline is threatened.

6. Water hammer generated by too fast air valve exhaust speed

The air valve has no multi-stage exhaust function, and a large amount of quick exhaust leads to the water filling speed to be too high to generate water filling water hammer, or the separated water column quickly closes the water hammer generated by a large amount of exhaust.

7. Low differential pressure of air valve

The pressure differential is the difference between the exhaust valve inlet pressure and the outlet atmospheric pressure. The air valve closing pressure difference refers to the difference between the inlet pressure and the outlet pressure of the valve when the exhaust valve is closed due to the fact that the floating ball is blown by air to block the large-caliber air inlet and outlet when the exhaust valve is used for exhausting a large amount of air. If the pressure difference is too low, the floating ball (floating body) can be blown by air to block the large-caliber air inlet and outlet in the water filling process of the pipeline, so that air resistance is generated in the pipeline, and the water filling of the pipeline cannot be finished.

In order to comprehensively solve numerous problems exposed in the running process of a water pipeline, a main air inlet and outlet valve with adjustable initial air displacement and a full-function air valve with the main air inlet and outlet valve are developed, and the problems are solved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the main air inlet and outlet valve with adjustable initial air displacement.

Another object of the present invention is to provide a full-function air valve having a main intake/exhaust valve, which can perform multi-stage exhaust in a positive pressure state and high-speed air supply in a negative pressure state of internal air.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

in a first aspect, the present invention provides a main intake and exhaust valve with adjustable initial displacement, where the main intake and exhaust valve includes a first valve body, a first cover body covering the first valve body and having a large-caliber intake and exhaust port, and a valve core assembly suspended on the first cover body; the valve core assembly comprises a valve rod and a valve core, the valve rod is fixedly arranged on the first cover body through a valve core support, the other end of the valve rod extends into the valve cavity of the main air inlet and outlet valve, and the valve core is movably connected to the valve rod and slides upwards along the valve rod under the action of medium pushing so as to seal the large-caliber air inlet and outlet; in an initial state, a gap for air intake and exhaust is formed between the valve core and the large-caliber air intake and exhaust port, and the size of the gap is adjustable.

Preferably, the valve core support is fixedly arranged on the mounting table in the first cover body through a fastening piece and an adjusting piece, and the adjusting piece is used for adjusting the axial distance between the valve core support and the mounting table so as to drive the valve rod to move up and down, so that the gap between the valve core and the large-caliber air inlet and outlet is adjustable.

Further preferably, the adjusting member is a flat head screw, a flat head end of the adjusting member penetrates through the valve core support and abuts against the mounting table, and the axial distance between the valve core support and the mounting table can be adjusted by rotating the flat head screw.

Further preferably, the top end of the valve rod is provided with an external thread, and the external thread is in threaded connection with the valve core support through an upper locking nut and a lower locking nut so as to realize locking and height adjustment of the valve rod.

Preferably, the valve core assembly further comprises a sleeve arranged in the middle of the valve core and a valve core pressing sleeve covering the sleeve, the lower end of the valve rod penetrates through the valve core pressing sleeve and extends into the sleeve, and a limiting block is arranged at the end part of the valve rod; and a spring is sleeved on the valve rod in the space range of the limiting block and the valve core pressing sleeve.

Preferably, the valve core comprises a pressure receiving part for bearing the air pressure in the valve cavity and an extension part extending along the outer diameter of the upper edge of the pressure receiving part, a plurality of first guide ribs are annularly arranged in the valve cavity of the main air inlet and outlet valve, the lower parts of the first guide ribs protrude towards the direction of the valve core to form a limiting bulge, and the limiting bulge is matched with the extension part to control the maximum downward moving distance of the valve core.

Preferably, a pressing plate is arranged on the periphery of the bottom of the first cover body, a first sealing ring with a step-shaped section is fixedly arranged on the pressing plate, the first sealing ring is of a wave-shaped multilayer linear sealing structure, and the wave-shaped multilayer linear sealing structure is attached to the top surface of the extending portion of the valve core to seal the large-caliber air inlet and outlet.

Preferably, a filter screen is arranged on the first valve body below the valve core, a dirt cleaning port is formed in the side face of the first valve body between the filter screen and the inlet of the main air inlet/outlet valve, a blank cap is arranged on the dirt cleaning port, and a water drainage ball valve is arranged on the blank cap; the filter screen adopts a curved surface or a polyhedral structure.

In a second aspect, the present invention further provides a full-function air valve, including the main air intake and exhaust valve in the above technical solution, and a slowly-closed type water hammer preventing air valve and a micro exhaust valve respectively integrated on the side surface of the main air intake and exhaust valve and communicated with the internal cavity of the main air intake and exhaust valve, where the main air intake and exhaust valve, the slowly-closed type water hammer preventing air valve and the micro exhaust valve are mutually matched to achieve multi-stage air exhaust in a positive pressure (greater than atmospheric pressure) state and high-speed air supplement in a negative pressure (less than or equal to atmospheric pressure) state of the internal air of the full-function air valve.

Preferably, the slow-closing type water hammer prevention air valve comprises a second valve body, a floating body arranged in the second valve body, a valve clack arranged above the floating body and a second cover body covering the second valve body; the gas-liquid separation device is characterized in that a working space for air supply, exhaust and flow limiting is formed inside the second cover body, a buffer body and a support frame are arranged in the working space, a through hole is formed in the middle of the support frame, a guide sleeve is inserted in the through hole, a guide shaft is connected above the guide sleeve, a flow limiting plate is sleeved on the guide shaft and moves upwards along the guide shaft under the thrust action of gas to abut against the buffer body, and therefore the gas discharge speed is reduced.

Further preferably, a guide rod is arranged at the top of the valve clack, the upper part of the guide rod extends into the guide sleeve to move up and down, and the lower part of the guide rod penetrates out of the valve clack; and a trace exhaust structure is arranged at the lower part of the guide rod, so that a small amount of gas in the valve cavity can be exhausted outwards in a valve clack sealing state.

More preferably, the micro exhaust structure comprises a micro exhaust port arranged at the lower part of the guide rod, and the micro exhaust port is used for communicating the slow-closing type water hammer prevention air valve cavity with the working space; the top of the floating body is provided with a sealing gasket matched with the trace exhaust port, and the floating body moves upwards under the buoyancy action of water to seal the trace exhaust port.

Preferably, the sealing surfaces of the slow-closing type waterproof hammer air valve and the micro-exhaust valve are higher than the sealing surface of the main air inlet and exhaust valve, the micro-exhaust valve is integrated on the main air inlet and exhaust valve through a first bent pipe, and the slow-closing type waterproof hammer air valve is integrated on the main air inlet and exhaust valve through a second bent pipe; the axial lines of the main air inlet and outlet valve, the micro air outlet valve and the slow-closing type water hammer preventing air valve are parallel to each other.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. the full-function air valve has three air inlets and outlets: the large-caliber air inlet and outlet, the slowly-closed water hammer air valve air inlet and outlet and the micro-exhaust valve air outlet of the main air inlet and outlet valve can realize 4 stages of exhausting in a large quantity of exhausting stages, a high-speed exhausting first stage, a high-speed exhausting second stage and a micro-exhausting stage, and in addition, when negative pressure occurs in a pipeline, a large quantity of air can be quickly supplied; the air supply device has the advantages of eliminating water hammer and gas collection in the pipeline when the pipeline runs, realizing the opening and air supply of the large-diameter air inlet and outlet when the pressure in the pipeline is equal to the atmospheric pressure, having double micro-exhaust outlets and being capable of reducing the gas collection phenomenon of the pipeline in advance.

2. The volume design of the upper cavity of the valve body of the full-function air valve is large, the sectional area of gas circulation is larger than that of the nominal diameter of the valve when the large-diameter air inlet and outlet of the main air inlet and outlet valve is fully opened, and the air inlet and outlet capacity of the air inlet and outlet is high.

3. The valve body is provided with a dirt cleaning port and a water drainage ball valve. If in debris get into the global function air valve body, can effectively block debris entering global function air valve body upper chamber through the filter screen, can avoid debris to arouse the jamming phenomenon of the first sealing washer position of global function air valve and moving part, can clear up the debris that the filter screen filtered down through the dirt removing opening on the valve body, before opening the stifle on the dirt removing opening, sluicing ball valve pressure release and exhaust on the accessible stifle.

4. The filter screen adopts the curved surface or polyhedron design, guarantees that the filtration pore area of filter screen is greater than the nominal diameter sectional area of valve, and the normal flow area of full function air valve can not be reduced to the import department installation filter screen in full function air valve body.

5. The first sealing ring of the large-diameter air inlet and outlet of the main air inlet and outlet valve adopts a wave-shaped multilayer linear sealing structure, the sealing contact surface is designed into wave-shaped multilayer line contact, the sealing contact area can be reduced, the sealing specific pressure is enlarged, the mutual extrusion degree of the sealing contact surface is enlarged, the sealing effect is improved, and the sealing reliability is high.

6. The gap between the valve core of the main air inlet and outlet valve and the large-caliber air inlet and outlet can be adjusted through the valve core support, the air outlet requirements of water pipelines with different diameters can be met, and the application range is wide.

Drawings

Figure 1 is a schematic cross-sectional view of a typical fully functional air valve of the present invention.

Fig. 2 is a cross-sectional schematic view of the valve core assembly of the present invention.

FIG. 3 is a cross-sectional view of the assembly of the valve core assembly with the cover of the main intake/exhaust valve according to the present invention.

Fig. 4 is an enlarged schematic view of B in fig. 3.

Fig. 5 is a schematic sectional view of the slow-closing type air valve for a waterproof hammer according to the present invention.

Fig. 6 is an enlarged schematic view of a structure at a in fig. 5.

Fig. 7 is a schematic view showing a state where the full-function air valve of the present invention exhausts at a low speed.

Fig. 8 is a schematic view showing a state where the air valve of the slow-closure type water hammer of the present invention is exhausted at a high speed.

Fig. 9 is a schematic view showing the state of throttling exhaust of the air valve of the slow-closure type water hammer according to the present invention.

Figure 10 is a schematic view of the fully functional air valve of the present invention after the evacuation of the air.

Fig. 11 is a schematic view showing a state of a minute amount of air exhaustion in the full-function air valve of the present invention.

Fig. 12 is an enlarged schematic view of the structure at C in fig. 11.

Fig. 13 is an enlarged schematic view of fig. 11 at D.

Figure 14 is a schematic view of the high volume of make-up air within the full function air valve of the present invention.

Reference numerals: 1-a first valve body; 2, filtering a screen; 3-a valve core assembly; 4-a first sealing ring; 5, pressing a plate; 6-a second bend; 7-a first valve cover; 8-large gland; 9-slowly closing type water hammer preventing air valve; 10-small gland; 11-a spool support; 12-upper locking nut; 13-upper cover; 14-lower locknut; 15-micro exhaust valve; 16-a protective net; 17-a first bend; 18-blank cap; 19-external thread straight-through pipe joint; 20-a water escape ball valve; 21-a first guide rib; 22-a mounting table; 23-a fastener; 24-an adjustment member; 31-a valve core; 32-a valve stem; 33-a spring; 34-valve core pressing sleeve; 35-a sleeve; 36-a limiting block; 311-a pressure receiving portion; 312-an extension; 91-a second valve body; 92-a float; 93-a gasket; 94-valve flap; 95-a second seal ring; 96-a second valve cover; 97-a buffer; 98-a guide sleeve; 99-a restrictor plate; 910-a guide shaft; 911-support sleeve; 912-protective screening; 913-a gland; 914-micro vent; 915-a limiting column; 916-carrying disc; 917-equal length stud; 918-cap nut; 919-a second guide rib; 920-a guide bar; 921-supporting frame.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Referring to fig. 1 and 2, a main intake and exhaust valve with adjustable initial exhaust volume, the volume of the cavity inside the main intake and exhaust valve is large at the top and small at the bottom, and the upper cavity and the lower cavity are in smooth transition; the volume design of the upper cavity is larger, and the sectional area of gas circulation is larger than that of the nominal diameter of the valve when the large-diameter gas inlet and outlet is fully opened, so that the strong gas supplementing capacity of the large-diameter gas inlet and outlet is ensured. The main air inlet and outlet valve comprises a first valve body 1, a first cover body which is covered above the first valve body 1 and is provided with a large-caliber air inlet and outlet port with the caliber of 0.8-1m, and a valve core assembly 3 hung on the first cover body; the valve core assembly 3 comprises a valve rod 32 and a valve core 31, the valve rod 32 is fixedly arranged on the first cover body through a valve core support 11, the other end of the valve rod extends into the valve cavity of the main intake/exhaust valve, and the valve core 31 is movably connected to the valve rod 32 and can slide along the valve rod 32; in an initial state, a gap for air intake and exhaust is formed between the valve core 31 and the large-caliber air intake and exhaust port under the coordination of the self gravity and the upward acting force of the valve rod 32, and the size of the gap is adjustable; the valve core 31 can move upwards along the valve rod 32 by means of the thrust action of gas in the vertical direction so as to seal the large-caliber air inlet and outlet.

In order to adjust the exhaust gap between the valve core and the large-caliber intake and exhaust port in the initial state, an installation platform for installing the valve core support 11 is arranged in the first cover body, the valve core support 11 is fixed on the installation platform 22 through a fastener 23 and an adjusting piece 24, and the fastener 23 adopts a hexagon socket head cap screw for fastening and connecting the valve core support 11 and the installation platform 22; the adjusting piece 24 is a flat head screw, the flat head end of the adjusting piece penetrates through the valve core support 11 and abuts against the mounting table 22, the distance between the valve core support 11 and the mounting table in the axis direction can be adjusted by rotating the flat head screw, so that the valve rod 32 is driven to move up and down, and then the gap between the valve core 31 and the large-caliber air inlet and outlet is adjustable.

Referring to fig. 3, the valve core assembly 3 is mounted on the upper cavity of the valve body, the valve core support 11 is mounted on the first cover body, the upper end of the valve rod 32 has an external thread, the upper end of the valve rod 32 penetrates through the valve core support 11, the lower locking nut 14 is screwed into the valve rod 32, and the lower locking nut 14 is fixed on the valve core support 11 by using a hexagon socket head cap screw, so that the valve core assembly 3 is suspended on the valve core support 11. In order to prevent the valve core assembly 3 from rotating during operation, an upper lock nut 12 is added to the upper end of the lower lock nut 14, thereby fixing and locking the valve core 31. Meanwhile, the upper locking nut 12 and the lower locking nut 14 can also adjust the size of a gap between the valve core assembly 3 and the large-diameter air inlet and outlet.

The valve core assembly 3 further comprises a sleeve 35, a valve core pressing sleeve 34 and a spring 33, the sleeve 35 is arranged in the middle of the valve core 31, and the valve core pressing sleeve 34 is arranged above the sleeve 35 in a covering mode; the lower end of the valve rod 32 penetrates through the valve core pressing sleeve 34 and extends into the sleeve 35, the lower end is also provided with a limiting block 36, and the limiting block 36 and the valve core pressing sleeve 34 form limiting fit to avoid the valve core 31 from falling off under a non-pressure state; the spring 33 is sleeved on the valve rod 32 in the space range of the limit block 36 and the valve core pressing sleeve 34, the spring 33 is continuously omitted in the figure, and the valve core 31 and the large-caliber air inlet and outlet are kept in a slightly opened state under the combined action of the self gravity and the spring elasticity.

Referring to fig. 2, the valve core 31 includes a pressure receiving portion 311 for receiving the air pressure in the valve cavity and an extending portion 312 extending radially along the outer diameter of the upper edge of the pressure receiving portion 311, and a plurality of first guiding ribs 21 are circumferentially arranged in the valve cavity of the main intake/exhaust valve, so as to ensure that the valve core assembly 3 does not deflect during the up-and-down movement; the lower portion of the first guiding rib 21 protrudes toward the valve core 31 to form a limiting protrusion, and the limiting protrusion cooperates with the extending portion 312 to control the maximum downward movement distance of the valve core 31.

The first cover body comprises an upper cover 13, a small gland 10, a large gland 8 and a first valve cover 7, wherein the upper cover 13, the small gland 10 and the large gland 8 are sequentially connected and arranged from the axis to the outside and are in a step shape; the first valve cover 7 is positioned at the bottom edge of the whole first cover body, and an air inlet and outlet channel is formed among the first valve cover 7, the upper cover 13, the small gland 10 and the large gland 8 and is used for connecting the first valve body 1 and being in sealing contact with the valve core assembly 3.

Referring to fig. 4, in order to ensure the sealing performance between the valve core 31 and the large-diameter air inlet and outlet, the first valve cover 7 is provided with a first sealing ring 4, and the first sealing ring 4 is fixed at the bottom of the first valve cover 7 by a pressing plate 5, and the first sealing ring 4 adopts a wave-shaped multilayer linear sealing structure which is attached to the top surface of the extending portion 312 of the valve core 31 to seal the large-diameter air inlet and outlet. The sealing contact surface is designed into wave-shaped multilayer line contact, so that the sealing contact area can be reduced, the sealing specific pressure is enlarged, the mutual extrusion degree of the sealing contact surface is enlarged, the sealing effect is improved, and the sealing reliability is high.

In order to prevent sundries from entering the full-function air valve body, a filter screen 2 is arranged on the first valve body 1 below the valve core 31 and is fixed on a boss in the inner cavity of the first valve body 1 through a hexagon screw. A dirt cleaning opening is formed in the side face of the first valve body 1 between the filter screen 2 and the inlet of the main air inlet and outlet valve, a blank cap 18 is arranged on the dirt cleaning opening, and a water drainage ball valve is arranged on the blank cap 18. The filter screen 2 in this embodiment preferably adopts the design of falling trapezoidal, guarantees that the air flow area of import filter screen 2 is greater than the valve nominal diameter sectional area, and the normal flow area of full-function air valve can not be reduced to the import department installation filter screen 2 in the full-function air valve body.

Referring to fig. 1, a full-function air valve includes a main air inlet/outlet valve, a micro air outlet valve 15 and a slow-closing type water hammer prevention air valve 9, wherein the main air inlet/outlet valve is used for quickly exhausting air when a pipeline is filled with water and quickly introducing air when negative pressure is generated in the pipeline; the main air inlet and outlet valve, the slowly-closed type water hammer air valve 9 and the micro-air outlet valve 15 are mutually matched to realize multi-stage air exhaust in a positive pressure state of the internal air of the full-function air valve and high-speed air supplement in a negative pressure state.

Referring to fig. 5, the slowly-closed type water hammer prevention air valve 9 is integrated on the side surface of the main intake/exhaust valve through a second elbow 6 and communicated with the internal cavity thereof, and includes a second valve body 91, a floating body 92 disposed in the second valve body 91, a valve flap 94 disposed above the floating body 92, and a second cover body covering the second valve body 91; the second cover body comprises a gland 913, a buffer body 97 and a second valve cover 96 which are sequentially arranged from top to bottom, and a working space for air intake and exhaust and flow limitation is formed among the gland 913, the buffer body 97 and the second valve cover 96; the second valve cover 96 in the working space is provided with a support frame 921, the middle part of the support frame 921 is provided with a through hole, the guide sleeve 98 is inserted in the through hole, the guide shaft 910 is connected with the upper part of the guide sleeve 98 by screw threads, the guide shaft 910 is sleeved with a flow limiting plate 99, and the flow limiting plate 99 can move upwards along the guide shaft 910 under the thrust action of gas and is abutted against the buffer body 97 so as to slow down the discharge speed of the gas.

Referring to fig. 6, a guide rod 920 is disposed at the top of the valve flap 94, the upper portion of the guide rod 920 extends into the guide sleeve 98 to move up and down, and the lower portion thereof penetrates through the valve flap 94; a trace air outlet 914 is arranged at the lower part of the guide rod 920, and the trace air outlet 914 is used for communicating the valve cavity of the slow-closing type waterproof hammer air valve 9 with the working space and can allow a small amount of air in the valve cavity to be discharged outwards under the sealing state of the valve clack; the top of the floating body 92 is provided with a sealing gasket 93 matched with the micro air vent 914, and the floating body moves upwards under the buoyancy action of water to seal the micro air vent 914. A bearing disc 916 for bearing the floating body 92 is arranged in the second valve body 91, a limiting column 915 is arranged at the bottom of the floating body 92, and the limiting column 915 penetrates through the bearing disc 916 and can move up and down along the vertical direction.

The gland 913 is fixedly connected with the second valve cover 96 through an equal-length stud 917 and a cap-shaped nut 918, a protective screen 912 is installed at an air outlet of the second cover body, the top of the protective screen 912 is connected with the gland 913, and the bottom of the protective screen 912 is connected with the buffer body 97; the top of the buffer 97 extends inward for a length to abut against the top of the upwardly moving restrictor plate 99. A support sleeve 911 is sleeved outside the equal-length stud 917, the top of the support sleeve 911 is in contact with the gland 913, and the bottom of the support sleeve 911 is in contact with the buffer 97. The second valve cover 96 is provided with a second sealing ring 95 at the bottom, and the second sealing ring 95 is used for being in sealing contact with the valve clack 94, so that the sealing effect is improved.

In order to ensure that the floating body 92 does not deflect in the up-and-down movement process, 4 second guide ribs 919 are arranged in the cavity of the second valve body 91, and the 4 second guide ribs have a guide function and can form limiting fit on the floating body 92 in the horizontal direction.

The micro exhaust valve 15 is integrated on the side surface of the main intake and exhaust valve through a first bent pipe 17 and communicated with an internal cavity of the main intake and exhaust valve, and the first bent pipe 17 is connected with the inlet end part of the micro exhaust valve 15 through an external thread straight pipe joint 19. The micro exhaust valve 15 includes a floating ball, a link mechanism and a micro exhaust hole, and conventional options in the art are adopted, and the embodiment is not further described.

Referring to fig. 7-14, a method for controlling the intake and exhaust of a full-function air valve comprises the following steps:

1. when the pipeline is empty, namely no pressure and no water exist in the pipeline, at the moment, the large-caliber air inlet and outlet is in an initial opening state, the slowly-closed water hammer air valve is in a full opening state, and the micro exhaust valve is in an opening state;

2. full-function air valve mass exhaust stage

When the pipeline is filled with water, the water filling speed in the pipeline is controlled to be 0.3-0.5m/s, the exhaust pressure difference between the valve cavity of the full-function air valve and the external atmospheric pressure is not more than 2KPa (a first threshold), all air inlets and outlets of the full-function air valve can exhaust normally, namely, the large-caliber air inlets and outlets can exhaust air in an initial state, the slowly-closed type water hammer preventing air valve exhausts air in a full-open state, and the micro-exhaust valve exhausts air (because the area of the micro-exhaust outlet is smaller, the exhaust amount can be ignored at the moment), and the full-function air valve is in a large-amount exhaust state at the moment, as shown in figure 7;

3. high-speed exhaust first stage of full-function air valve

When the water filling speed in the pipeline exceeds 0.3-0.5m/s, and the exhaust pressure difference between the valve cavity of the full-function air valve and the external atmospheric pressure exceeds 2KPa (a second threshold), the valve core can close the large-diameter air inlet and outlet under the thrust action of gas, the large-diameter air inlet and outlet stops exhausting, the exhaust pressure in the pipeline can be instantly increased due to the closing of the large-diameter air inlet and outlet, and the slowly-closed type water hammer air valve can be fully opened to perform a high-speed exhaust state (the total exhaust area of the full-function air valve is reduced, the exhaust capacity is reduced, a pressure air bag is formed in the pipeline, the water filling speed in the pipeline can be reduced by the air bag in the pipeline), and the micro exhaust valve performs exhaust (the exhaust amount can be ignored due to the small area of the micro exhaust port), as shown in figure 8;

3. high-speed exhaust second stage of full-function air valve

When the exhaust pressure difference between the valve cavity of the full-function air valve and the external atmospheric pressure exceeds 15-30KPa (a third threshold), the flow limiting plate is put into operation, the flow limiting plate 99 moves upwards along the guide shaft 910 under the thrust action of strong pressure gas and abuts against the buffer body 97, and the exhaust area of the exhaust channel of the slow-closing type water hammer air valve 9 is reduced; at this time, the air pressure in the valve chamber of the full-function air valve increases, the slow-closing type water hammer prevention air valve 9 is still in a high-speed exhaust state (due to the fact that the total exhaust area of the full-function air valve is reduced, the exhaust capacity is reduced, the pressure air bag is formed in the pipeline, the water filling speed in the pipeline can be reduced by the air bag in the pipeline, the water filling speed is kept in an allowable range), and the micro exhaust valve 15 continues to exhaust air, as shown in fig. 9.

The flow in the throttling state is 5-30% of the flow of the slowly-closed water hammer air valve in the same differential pressure non-throttling state (or the flow can be defined according to the requirement of a user by changing the size of the hole on the flow limiting plate).

When the pipeline fills water, when the water filling speed can not be effectively controlled, the air in the pipeline is discharged at a high speed through the air valve, the water in the pipeline impacts the floating ball at a high speed to form larger impact pressure, and the speed of air discharge can be effectively reduced through the throttling water hammer prevention device, so that the pressure fluctuation in the system is reduced, and the generation of a water filling hammer is avoided.

4. After the empty pipe is filled with water, all the exhaust ports are automatically closed.

After the air pipe is filled with water, the air in the pipeline is completely discharged, the water enters a full-function air valve, and all exhaust ports are automatically closed under the buoyancy action of the water, as shown in fig. 10;

5. micro exhaust stage

When the water in the pipeline is normally conveyed, a small amount of gas separated out from the water body can continue to gather at the upper part of the air valve. When the gas is accumulated to a certain amount, the valve clack sealed with the slow-closing type waterproof hammer air valve cannot fall due to the existence of gas pressure in the valve cavity, but a floating ball in the micro exhaust valve and a floating body in the slow-closing type waterproof hammer air valve can fall along with the reduction of the water level; the descending of the floating ball in the micro exhaust valve drives the connecting rod mechanism to move downwards, the micro exhaust hole is opened, and the gas is exhausted outwards; when the floating body in the slow-closing type water hammer air valve descends, the micro exhaust port is directly opened, and the gas is exhausted outwards. In the discharging process, the water level gradually rises, the micro exhaust port and the micro exhaust hole are closed again, the exhaust is stopped, and the circulation is continuously carried out, so that the air bag is not formed, as shown in the figure 11-13;

6. stage of large amount of air supply

When negative pressure occurs in the pipeline due to water drainage of the pipeline or pipeline accidents, the large-diameter air inlet and outlet can be opened rapidly under the action of the self gravity of the valve core assembly, (a certain gap is kept between a sealing surface on the valve core assembly and a sealing ring of the large-diameter air inlet and outlet during installation, and when the pressure in the pipeline is equal to the atmospheric pressure, the large-diameter air inlet and outlet can be opened for air supplement), the valve core assembly can move downwards under the action of the negative pressure, the larger the negative pressure is, the larger the downward movement distance of the valve core is, and the downward movement of the valve core is realized by the negative pressure overcoming the force of the spring in the movement process.

The slowly-closed type water hammer air valve can be opened for air supplement under the negative pressure of-1 KPa, a large amount of air supplement is carried out by the large-diameter air inlet and outlet and the slowly-closed type water hammer air valve together, the vacuum phenomenon in a pipeline can be avoided, and the safety of the pipeline is ensured, as shown in figure 14;

7. after water enters the pipeline again, the full-function air valve can repeat the exhaust process, air in the pipeline is discharged in a staged mode, and water hammer in the pipeline is effectively avoided. After the air is exhausted, water enters the full-function air valve, and all the air inlet and exhaust ports are automatically closed under the action of the water, as shown in figure 10.

A full function air valve of the present invention can be easily manufactured or used by those skilled in the art according to the description of the present invention and the accompanying drawings, and can produce the positive effects of the present invention described herein.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (12)

1. The utility model provides an initial displacement adjustable main air inlet and outlet valve which characterized in that: the main air inlet and outlet valve comprises a first valve body (1), a first cover body which is covered above the first valve body (1) and is provided with a large-caliber air inlet and outlet, and a valve core assembly (3) hung on the first cover body; the valve core assembly (3) comprises a valve rod (32) and a valve core (31), the valve rod (32) is fixedly arranged on the first cover body through a valve core support (11), the other end of the valve rod extends into the valve cavity of the main air inlet and outlet valve, and the valve core (31) is movably connected to the valve rod (32) and slides upwards along the valve rod (32) under the action of medium pushing so as to seal the large-caliber air inlet and outlet; in an initial state, a gap for air intake and exhaust is formed between the valve core (31) and the large-caliber air intake and exhaust port, and the size of the gap is adjustable.

2. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1, wherein: the valve core support (11) is fixedly arranged on the mounting table in the first cover body through a fastening piece and an adjusting piece, and the adjusting piece is used for adjusting the axial distance between the valve core support (11) and the mounting table so as to drive the valve rod (32) to move up and down, so that the gap between the valve core (31) and the large-caliber air inlet and outlet is adjustable.

3. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 2 wherein: the adjusting piece is a flat head screw, the flat head end of the adjusting piece penetrates through the valve core support (11) and abuts against the mounting table, and the axial distance between the valve core support (11) and the mounting table can be adjusted by rotating the flat head screw.

4. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1 or 2, characterized in that: the top end of the valve rod (32) is provided with an external thread, and the external thread is in threaded connection with the valve core support (11) through an upper locking nut (12) and a lower locking nut (14) so as to realize locking and height adjustment of the valve rod (32).

5. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1, wherein: the valve core assembly (3) further comprises a sleeve (35) arranged in the middle of the valve core (31) and a valve core pressing sleeve (34) covering the sleeve (35), the lower end of the valve rod (32) penetrates through the valve core pressing sleeve (34) and extends into the sleeve (35), and a limiting block (36) is arranged at the end part of the valve rod; and a spring (33) is sleeved on the valve rod (32) in the space range of the limiting block (36) and the valve core pressing sleeve (34).

6. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1, wherein: the valve core (31) comprises a pressure receiving part (311) for bearing air pressure in the valve cavity and an extending part (312) extending along the outer diameter of the upper edge of the pressure receiving part (311), a plurality of first guide ribs (21) are annularly arranged in the valve cavity of the main air inlet and outlet valve, the lower part of each first guide rib (21) protrudes towards the direction of the valve core (31) to form a limiting protrusion, and the limiting protrusion is matched with the extending part to control the maximum downward movement distance of the valve core (31).

7. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1, wherein: the periphery of the bottom of the first cover body is provided with a pressing plate (5), a first sealing ring (4) with a step-shaped section is fixedly arranged on the pressing plate (5), the first sealing ring (4) adopts a wave-shaped multilayer linear sealing structure, and the wave-shaped multilayer linear sealing structure is used for being attached to the top surface of an extending part (312) of the valve core (31) to seal the large-caliber air inlet and outlet.

8. A main inlet/outlet valve with adjustable initial exhaust volume according to claim 1, wherein: a filter screen (2) is arranged on the first valve body (1) below the valve core (31), a dirt cleaning opening is formed in the side face of the first valve body (1) between the filter screen (2) and the inlet of the main air inlet and outlet valve, a blank cap (18) is arranged on the dirt cleaning opening, and a water drainage ball valve (20) is arranged on the blank cap (18); the filter screen (2) adopts a curved surface or a polyhedral structure.

9. A full function air valve characterized by: the air valve comprises a main air inlet and outlet valve as claimed in claim 1 and a slowly-closed type water hammer preventing air valve (9) and a micro air outlet valve (15) which are respectively integrated on the side surfaces of the main air inlet and outlet valve and communicated with the inner cavity of the main air inlet and outlet valve, wherein the main air inlet and outlet valve, the slowly-closed type water hammer preventing air valve (9) and the micro air outlet valve (15) are mutually matched to realize multi-stage air exhaust in a positive pressure state and high-speed air supplement in a negative pressure state of the air in the full-function air valve.

10. A full function air valve according to claim 9 wherein: the slowly-closed type water hammer preventing air valve (9) comprises a second valve body (91), a floating body (92) arranged in the second valve body (91), a valve clack (94) arranged above the floating body (92) and a second cover body covering the second valve body (91); the inside working space that supplies air inlet and outlet and current-limiting that forms of second lid, be equipped with buffer (97) and support frame (921) in the working space, the through-hole has been seted up at support frame (921) middle part, and guide sleeve (98) have been alternate in the through-hole, and guide sleeve (98) top is connected with guiding axle (910), and the cover is equipped with current-limiting plate (99) on guiding axle (910), and current-limiting plate (99) are followed guiding axle (910) rebound and are leaned on to buffer (97) under gaseous thrust effect to reduce gaseous discharge capacity.

11. A full function air valve according to claim 10 wherein: the top of the valve clack (94) is provided with a guide rod (920), the upper part of the guide rod (920) extends into the guide sleeve (98) to move up and down, and the lower part of the guide rod penetrates out of the valve clack (94); and a micro exhaust structure is arranged at the lower part of the guide rod (920), so that a small amount of gas in the valve cavity can be exhausted outwards in a valve clack sealing state.

12. A full function air valve according to claim 11 wherein: the micro exhaust structure comprises a micro exhaust port (914) arranged at the lower part of the guide rod (920), and the micro exhaust port (914) is used for communicating the valve cavity of the slowly-closed type waterproof hammer air valve (9) with the working space; and a sealing gasket (93) matched with the micro exhaust port (914) is arranged at the top of the floating body (92), and moves upwards under the buoyancy action of water to seal the micro exhaust port (914).

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