CN112361021A - Air valve and pneumatic double-diaphragm pump - Google Patents

Abstract

The invention discloses an air valve and a pneumatic double-diaphragm pump, wherein the air valve comprises a main air valve, a reversing valve, an air inlet and an air outlet, the main air valve comprises a valve seat and a main air valve core, the main air valve core is arranged in the valve seat and can slide in a reciprocating manner along the axial direction of the main air valve core, the main air valve core and the valve seat form a first cavity and a second cavity, and the first cavity and the second cavity are respectively arranged at two ends of the main air valve core in the axial direction; the reversing valve is arranged in the valve seat, the first chamber and the second chamber are switched and communicated between the air inlet and the air outlet through the reversing valve, and internal passages among the main air valve, the reversing valve, the air inlet and the air outlet are all located in the valve seat. This pneumatic valve is integrated in same disk seat with main air valve and switching-over valve, through the switching-over valve with high-pressure gas leading-in, derive first cavity or second cavity, realize the reciprocating motion of main air valve core to each internal passage all sets up in the disk seat, has improved the reliability of gas circuit intercommunication, has simplified the structure, is convenient for maintain the valve body.

Description

Air valve and pneumatic double-diaphragm pump

Technical Field

The invention relates to an air valve and a pneumatic double-diaphragm pump.

Background

The pneumatic double diaphragm pump is a new type of conveying machinery, and usually adopts compressed air, nitrogen or natural gas as power. Two main air cavities are arranged in the pneumatic double-diaphragm pump. The pneumatic double diaphragm pump comprises a main air valve and a reversing valve. The main air valves are used for switching the air supply and exhaust sequence of the two main air cavities, so that the diaphragm is driven to reciprocate by high-pressure air, and the suction and discharge of liquid are realized. The valve core of the main air valve is moved by the reversing valve. The reversing valve drives the valve core of the main air valve to move by changing the flow direction of the gas introduced into the main air valve. At present, the main air valve and the reversing valve are designed into separate modules, so that the number of parts of a valve body is large, the structure is complex, the sealing surface is increased due to the fact that the main air valve and the reversing valve are arranged separately, and the risk of leakage between air paths is increased.

Disclosure of Invention

The invention aims to overcome the defect that the structure of a valve body is complex due to the fact that a main air valve and a reversing valve are arranged in a split mode in the prior art, and provides an air valve and a pneumatic double-diaphragm pump.

The invention solves the technical problems through the following technical scheme:

an air valve comprises a main air valve, a reversing valve, an air inlet and an air outlet, wherein the main air valve comprises a valve seat and a main air valve core, the main air valve core is arranged in the valve seat and can slide in a reciprocating mode along the axial direction of the main air valve core, the main air valve core and the valve seat form a first cavity and a second cavity, and the first cavity and the second cavity are respectively arranged at two ends of the main air valve core in the axial direction;

the reversing valve is arranged in the valve seat, the first chamber and the second chamber are switched and communicated between the air inlet and the air outlet through the reversing valve, and internal passages among the main air valve, the reversing valve, the air inlet and the air outlet are all located in the valve seat.

In this scheme, this pneumatic valve is with main air valve and switching-over valve integration in same disk seat, through the switching-over valve with high-pressure gas leading-in, derive first cavity or second cavity, realize the reciprocating motion of main air valve core to each inside passage all sets up in the disk seat, has simplified the structure of pneumatic valve correspondingly, has improved the reliability of gas circuit intercommunication, the maintenance of the pneumatic valve of also being convenient for simultaneously.

Preferably, the reversing valve comprises a reversing valve core, the reversing valve core is arranged in the valve seat and can slide in a reciprocating manner along the axial direction of the reversing valve core, one end of the reversing valve core is used for being abutted against and pushed by a first diaphragm of the pneumatic double-diaphragm pump, and the other end of the reversing valve core is used for being abutted against and pushed by a second diaphragm of the pneumatic double-diaphragm pump.

In this scheme, the switching-over case sets up between first diaphragm and second diaphragm, and first diaphragm and second diaphragm are pushed by high-pressure gas. When the first diaphragm is close to and abutted against one end of the reversing valve core, the first diaphragm pushes the reversing valve core to slide towards the direction of the second diaphragm, and when the second diaphragm is close to and abutted against the other end of the reversing valve core, the second diaphragm pushes the reversing valve core to slide towards the direction of the first diaphragm, so that the reciprocating sliding of the reversing valve core is realized.

Preferably, a first annular groove and a second annular groove are arranged on the outer peripheral surface of the reversing valve core, the internal passage comprises a first exhaust passage, a second exhaust passage, a first switching passage, a second switching passage and an air inlet passage, the first exhaust passage and the second exhaust passage are communicated with the exhaust port, and the air inlet passage is communicated with the air inlet;

one end of the first switching passage communicates with the first chamber, and the other end of the first switching passage switches communication between the first exhaust passage and the intake passage through the first annular groove;

one end of the second switching passage communicates with the second chamber, and the other end of the second switching passage switches communication between the second exhaust passage and the intake passage through the second annular groove.

In this aspect, the first switching passage is provided between the first exhaust passage and the intake passage, and the second switching passage is provided between the second exhaust passage and the intake passage. When the reversing valve core slides to one end, the first annular groove communicates the first exhaust passage with the first switching passage to exhaust gas in the first chamber, and meanwhile, the second annular groove communicates the gas inlet passage with the second switching passage to charge gas in the second chamber. When the reversing valve core slides to the other end, the first annular groove communicates the air inlet passage with the first switching passage to charge air into the first chamber, and simultaneously the second annular groove communicates the second air outlet passage with the second switching passage to discharge air in the second chamber.

When the reversing valve core slides, gas can be rapidly led in or led out of the first cavity and the second cavity, and the main valve core is pushed to reciprocate by high-pressure gas.

Preferably, the reversing valve further includes a first valve sleeve, the first valve sleeve is sleeved on the reversing valve core, a plurality of annular flanges are arranged on the outer peripheral surface of the first valve sleeve, the outer peripheries of the annular flanges abut against the inner wall of the valve seat, annular cavities corresponding to the first exhaust passage, the second exhaust passage, the first switching passage, the second switching passage and the intake passage one to one are formed between adjacent annular flanges, and the first exhaust passage, the second exhaust passage, the first switching passage, the second switching passage and the intake passage all penetrate through the corresponding annular cavities.

In this scheme, the gaseous follow annular cavity that is arranged in the drive diaphragm passes through, and annular cavity is arranged in the impurity of holding gas, prevents that impurity from blockking up the gas circuit, also is convenient for regularly clear up the switching-over valve simultaneously, prolongs the life of switching-over valve.

Preferably, the first valve sleeve further comprises a plurality of first sealing rings, a sealing groove is formed in the outer peripheral surface of the annular flange, the first sealing rings are embedded in the sealing groove, and the first sealing rings are used for sealing the valve sleeve and the valve seat.

In this scheme, first sealing ring is used for improving the gas tightness between first valve barrel and the disk seat, avoids leaking gas between each gas circuit, improves the reliability of switching-over valve.

Preferably, the reversing valve core further comprises a plurality of second sealing rings, a plurality of sealing grooves are formed in the outer peripheral surface of the reversing valve core, the second sealing rings are embedded in the sealing grooves, and the second sealing rings are used for sealing the reversing valve core and the first valve sleeve.

In the scheme, the reversing valve core moves in a reciprocating mode, and the second sealing ring is used for improving the air tightness between the reversing valve core and the valve sleeve, so that accurate and reliable communication of all air passages is realized when the reversing valve core is switched.

Preferably, a third annular groove and a fourth annular groove are arranged on the outer peripheral surface of the main air valve core, a first pump chamber channel, a first exhaust channel, a second pump chamber channel and a second exhaust channel are further arranged in the valve seat, and the first exhaust channel and the second exhaust channel are communicated with the exhaust port;

one end of the first pump chamber channel is used for being communicated with a first diaphragm chamber of the pneumatic double-diaphragm pump, and the other end of the first pump chamber channel is switched and communicated between the first exhaust channel and the air inlet through the third annular groove;

one end of the second pump chamber channel is used for being communicated with a second diaphragm chamber of the pneumatic double-diaphragm pump, and the other end of the second pump chamber channel is switched and communicated between the second exhaust channel and the air inlet through the fourth annular groove.

In this aspect, the first pump chamber passage is provided between the first exhaust passage and the intake port, and the second pump chamber passage is provided between the second exhaust passage and the intake port. When the main air valve core slides, gas can be quickly introduced into or led out of the first diaphragm cavity and the second diaphragm cavity, so that the diaphragms are driven to do reciprocating motion through high-pressure gas, and then the double-diaphragm pump can suck and discharge liquid.

Preferably, the main air valve further comprises a valve sleeve component, the peripheral surface of the valve sleeve component abuts against the inner wall of the valve seat, and the valve sleeve component is sleeved on the main air valve core;

the valve barrel subassembly includes a plurality of valve barrel units, and is a plurality of the connection can be dismantled in proper order to the valve barrel unit, the valve barrel unit includes the lantern ring and connecting piece, the one end of connecting piece can be dismantled connect in the lantern ring, the other end of connecting piece is used for dismantling and connects next the lantern ring.

In this scheme, the valve barrel is spliced by a plurality of valve barrel units, forms the cavity air flue between the lantern ring, compares with the air flue that fluting formed on main gas case, and the space of its cavity air flue is bigger, is convenient for hold more impurity. Meanwhile, the valve sleeve component is convenient to clean or replace due to the detachable connection mode.

Preferably, the valve housing assembly includes a first sealing member, an annular groove is disposed on an outer peripheral surface of the collar, the first sealing member is embedded in the annular groove, and the first sealing member is used for sealing the collar and the valve seat.

In this scheme, first sealing member is used for improving the gas tightness between the lantern ring and the disk seat, avoids leaking gas between each gas circuit, improves main air valve's reliability.

Preferably, the main gas valve core further comprises a second sealing element, an annular groove is formed in the outer peripheral surface of the main gas valve core, the second sealing element is embedded in the annular groove, and the second sealing element is used for sealing the main gas valve core and the sleeve ring.

In this scheme, because main air valve core reciprocating motion, the second sealing member is used for improving the gas tightness between main air valve core and the lantern ring, ensures that main air valve core when the conversion, realizes that each gas circuit communicates accurately, reliably.

Preferably, the valve seat includes a valve body and an end cover, an end of the valve body is provided with an installation channel, the installation channel extends along an axial direction of the main air valve core, the main air valve core can be installed through the installation channel, and the end cover is used for closing the installation channel and is detachably connected to the valve body.

In this scheme, the installation passageway is convenient for to main air valve core installation, maintenance.

A pneumatic double diaphragm pump comprises a first diaphragm chamber, a second diaphragm chamber and the air valve, wherein the air valve is arranged between the first diaphragm chamber and the second diaphragm chamber and is respectively communicated with the first diaphragm chamber and the second diaphragm chamber.

In this scheme, because the pneumatic valve has integrateed main air valve and switching-over valve, for whole part, consequently need not to carry out whole disassembling to pneumatic two diaphragm pumps, just can get out the air valve, conveniently clears up or change vulnerable part main air valve and switching-over valve simultaneously. The air valve is arranged in the middle of the pneumatic double-diaphragm pump, so that internal passages are conveniently and symmetrically arranged, and the structure is optimized.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows: this pneumatic valve is integrated in same disk seat with main air valve and switching-over valve, through the switching-over valve with high-pressure gas leading-in, derive first cavity or second cavity, realize the reciprocating motion of main air valve core to each inside passage all sets up in the disk seat, has improved the reliability of gas circuit intercommunication, has simplified the structure of pneumatic valve, has improved economic benefits, the maintenance of the pneumatic valve of also being convenient for simultaneously.

Drawings

Fig. 1 is a schematic perspective view of a first viewing angle of a pneumatic double diaphragm pump according to a preferred embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second viewing angle of the pneumatic double diaphragm pump according to a preferred embodiment of the invention.

Fig. 3 is an exploded view of a pneumatic double diaphragm pump according to a preferred embodiment of the present invention.

Fig. 4 is a third perspective view of a pneumatic double diaphragm pump according to a preferred embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a-a in fig. 4.

Fig. 6 is a schematic cross-sectional view of B-B in fig. 4.

FIG. 7 is a schematic diagram of the internal structure of a main valve at a first viewing angle according to a preferred embodiment of the present invention.

FIG. 8 is a second perspective internal view of the main valve according to the preferred embodiment of the present invention.

FIG. 9 is a schematic diagram of the inner structure of the main valve at a third viewing angle according to a preferred embodiment of the present invention.

FIG. 10 is a schematic structural view of a main air valve core according to a preferred embodiment of the present invention.

Fig. 11 is a schematic structural view of a valve sleeve assembly in accordance with a preferred embodiment of the present invention.

Fig. 12 is a schematic structural view of a direction change valve core according to a preferred embodiment of the present invention.

Fig. 13 is a schematic structural view of a first valve sleeve according to a preferred embodiment of the present invention.

Description of reference numerals:

pneumatic double diaphragm pump 10

First diaphragm chamber 101

Second diaphragm chamber 102

Left fluid chamber 103

Right fluid chamber 104

Center shaft 105

Liquid inlet 106

Liquid discharge port 107

Gas valve 1

Main air valve 11

Valve seat 111

Valve body 112

Threaded hole 1121

End cap 113

First exhaust passage 1101

Second exhaust passage 1102

First switching path 1103

Second switching path 1104

Intake passage 1105

First pump chamber passage 1106

First exhaust channel 1107

Second pump chamber passage 1108

Second exhaust passage 1109

Main gas spool 114

Third annular groove 1141

Fourth annular recess 1142

First chamber 115

Second chamber 116

Valve housing assembly 117

Valve housing unit 1171

Collar 11711

Connector 11712

First seal 1172

Second seal 1173

Reversing valve 12

The direction change valve spool 121

First annular groove 1211

Second annular groove 1212

First valve housing 122

Annular flange 1221

Annular cavity 1222

First seal ring 123

Second seal ring 124

Air inlet 13

Exhaust port 14

Gas flow 100

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 1 to 13, the present embodiment discloses a gas valve, and the gas valve 1 includes a main gas valve 11, a directional valve 12, an intake port 13, and an exhaust port 14. The main air valve 11 includes a valve seat 111 and a main air valve core 114, the main air valve core 114 is disposed inside the valve seat 111 and is capable of reciprocating sliding along an axial direction of the main air valve core 114, the main air valve core 114 and the valve seat 111 form a first chamber 115 and a second chamber 116, and the first chamber 115 and the second chamber 116 are respectively disposed at two ends of the main air valve core 114 in the axial direction. The direction change valve 12 is disposed in the valve seat 111, the first chamber 115 and the second chamber 116 are switched and communicated between the intake port 13 and the exhaust port 14 by the direction change valve 12, and the internal passages among the main air valve 11, the direction change valve 12, the intake port 13, and the exhaust port 14 are located inside the valve seat 111.

In the embodiment, the main air valve 11 and the reversing valve 12 are integrated in the same valve seat 111 of the air valve 1, high-pressure air is introduced into and led out of the first chamber 115 or the second chamber 116 through the reversing valve 12, the reciprocating motion of the main air valve core 114 is realized, and each internal passage is arranged in the valve seat 111, so that the structure of the air valve 1 is correspondingly simplified, the reliability of air passage communication is improved, and meanwhile, the maintenance of the air valve 1 is facilitated.

As shown in fig. 5 and 6, the direction valve 12 includes a direction valve spool 121, the direction valve spool 121 being disposed in the valve seat 111 and reciprocally slidable in an axial direction of the direction valve spool 121, and the direction valve spool 121 being located between a first diaphragm (not shown) and a second diaphragm (not shown). One end of the direction change valve spool 121 is adapted to abut against and be pushed by a first diaphragm of the air operated double diaphragm pump 10, and the other end of the direction change valve spool 121 is adapted to abut against and be pushed by a second diaphragm of the air operated double diaphragm pump 10. The first and second diaphragms are connected by a central shaft 105 and can be pulled towards each other by the central shaft 105.

When the first diaphragm chamber 101 is filled with high-pressure gas, the first diaphragm pulls the second diaphragm to approach and push the diverter valve spool 121 to slide towards the first diaphragm through the central shaft 105; when the second diaphragm chamber 102 is filled with high-pressure gas, the second diaphragm pulls the first diaphragm to approach and push the direction switching valve element 121 to slide toward the direction of the second diaphragm through the central shaft 105, thereby realizing the reciprocating sliding of the direction switching valve element 121.

As shown in fig. 7 and 12, the direction change valve body 121 is provided with a first annular groove 1211 and a second annular groove 1212 on an outer peripheral surface thereof. The internal passages include a first exhaust passage 1101, a second exhaust passage 1102, a first switching passage 1103, a second switching passage 1104, and an intake passage 1105. The first switching passage 1103 is provided between the first exhaust passage 1101 and the intake passage 1105, and the second switching passage 1104 is provided between the second exhaust passage 1102 and the intake passage 1105, facilitating quick switching of communication by the diverter valve body 121. The first exhaust passage 1101 and the second exhaust passage 1102 each communicate with the exhaust port 14. The intake passage 1105 communicates with the intake port 13. One end of the first switching passage 1103 communicates with the first chamber 115, the other end of the first switching passage 1103 switches communication between the first exhaust passage 1101 and the intake passage 1105 via the first annular groove 1211, one end of the second switching passage 1104 communicates with the second chamber 116, and the other end of the second switching passage 1104 switches communication between the second exhaust passage 1102 and the intake passage 1105 via the second annular groove 1212.

The working process of the reversing valve 12 is as follows:

when the direction change valve spool 121 slides to one end, the first annular groove 1211 communicates the first exhaust passage 1101 with the first switching passage 1103, so that the first chamber 115 communicates with the exhaust port 14, discharging the gas of the first chamber 115; meanwhile, the second annular groove 1212 communicates the intake passage 1105 with the second switching passage 1104, so that the second chamber 116 communicates with the intake port 13, and the high-pressure gas is charged into the second chamber 116, thereby pushing the direction change valve element 121 to slide toward the first chamber 115. When the direction changing valve element 121 slides to the other end, the first annular groove 1211 connects the gas inlet path 1105 with the first switching path 1103, so that the first chamber 115 is connected with the gas inlet 13, high-pressure gas is filled into the first chamber 115, and the direction changing valve element 121 is pushed to slide towards the second chamber 116; at the same time, the second annular groove 1212 communicates the second exhaust passage 1102 with the second switching passage 1104, so that the second chamber 116 communicates with the exhaust port 14, exhausting the gas of the second chamber 116. When the direction switching valve element 121 slides, gas can be rapidly introduced into or discharged from the first chamber 115 and the second chamber 116, and the main gas valve element 114 is pushed to reciprocate by high-pressure gas.

As shown in fig. 13, to increase the service life of the reversing valve 12, the reversing valve 12 further includes a first valve housing 122. The first valve housing 122 is fitted to the selector valve body 121, a plurality of annular flanges 1221 are provided on an outer peripheral surface of the first valve housing 122, an outer periphery of the annular flanges 1221 abuts against an inner wall of the valve seat 111, and annular cavities 1222 corresponding to the first exhaust passage 1101, the second exhaust passage 1102, the first switching passage 1103, the second switching passage 1104, and the intake passage 1105 in one-to-one correspondence are formed between adjacent annular flanges 1221. The first exhaust path 1101, the second exhaust path 1102, the first switching path 1103, the second switching path 1104 and the intake path 1105 all pass through the corresponding annular cavity 1222, so that the compressed gas passes through the annular cavity 1222, impurities in the gas are contained in the annular cavity 1222, the impurities are prevented from blocking the gas path, and the periodic cleaning of the directional valve 12 is facilitated. A screw hole 1121 for fixing the first valve housing 122 is further provided in the valve seat 111, and a screw is screwed into the screw hole 1121 to fix the first valve housing 122 to the valve seat 111.

In order to improve the sealing performance of each air passage, the first valve housing 122 further includes a plurality of first sealing rings 123. The outer peripheral surface of the annular flange 1221 is provided with a sealing groove, the first sealing ring 123 is embedded in the sealing groove, and the first sealing ring 123 is used for sealing the valve sleeve and the valve seat 111, so that air leakage between air passages is avoided, and the reliability of the reversing valve 12 is improved.

As shown in fig. 12, since the direction switching valve element 121 slides back and forth, in order to ensure that the gas passages of the direction switching valve element 121 are accurately and reliably communicated when the gas passages are switched, the direction switching valve element 121 further includes a plurality of second sealing rings 124. A plurality of seal grooves are formed in the outer circumferential surface of the direction valve element 121, a second seal ring 124 is fitted in the seal grooves, and the second seal ring 124 is used for sealing the direction valve element 121 and the first valve sleeve 122.

As shown in fig. 7 to 10, to facilitate the air passage switching, a third annular groove 1141 and a fourth annular groove 1142 are provided on the outer circumferential surface of the main air spool 114. Also disposed within the valve seat 111 are a first pump chamber passage 1106, a first exhaust passage 1107, a second pump chamber passage 1108, and a second exhaust passage 1109. The first pump chamber passage 1106 is provided between the first exhaust passage 1107 and the intake port 13, and the second pump chamber passage 1108 is provided between the second exhaust passage 1109 and the intake port 13. The first exhaust passage 1107 and the second exhaust passage 1109 are both communicated with the exhaust port 14.

One end of the first pump chamber channel 1106 is used to communicate with the first diaphragm chamber 101 of the air operated double diaphragm pump 10, and the other end of the first pump chamber channel 1106 switches communication between the first exhaust channel 1107 and the air inlet 13 through the third annular recess 1141. One end of the second pump chamber passage 1108 is used to communicate with the second diaphragm chamber 102 of the air operated double diaphragm pump 10, and the other end of the second pump chamber passage 1108 switches communication between the second exhaust passage 1109 and the intake port 13 through the fourth annular groove 1142.

The working process of the main gas valve 11 is as follows:

when the main air valve spool 114 slides to the upper end, the third annular groove 1141 communicates the first exhaust passage 1107 with the first pump chamber passage 1106, so that the first diaphragm chamber 101 communicates with the exhaust port 14, and the air in the first diaphragm chamber 101 is exhausted; at the same time, the fourth annular recess 1142 communicates the air inlet 13 with the second pump chamber passage 1108, so that the second diaphragm chamber 102 communicates with the air inlet 13, and the second diaphragm chamber 102 is charged with high-pressure air, causing the second diaphragm to open. When the main spool 114 slides to the lower end, the third annular recess 1141 communicates the first pump chamber channel 1106 with the intake port 13, so that the first diaphragm chamber 101 communicates with the intake port 13, and the first diaphragm chamber 101 is filled with high-pressure gas, causing the first diaphragm to open; at the same time, the fourth annular recess 1142 communicates the second vent passage 1109 with the second pump chamber passage 1108, so that the second diaphragm chamber 102 communicates with the vent 14, venting the gas in the second diaphragm chamber 102. When the main air valve core 114 slides, gas can be rapidly introduced into or discharged from the first diaphragm chamber 101 and the second diaphragm chamber 102, so that the diaphragms are driven to reciprocate by high-pressure gas, and then the suction and discharge work of the double-diaphragm pump on liquid is realized.

The main air valve 11 further includes a valve sleeve assembly 117, an outer peripheral surface of the valve sleeve assembly 117 abuts against an inner wall of the valve seat 111, and the valve sleeve assembly 117 is sleeved on the main air valve core 114. Valve housing assembly 117 includes a plurality of valve housing units 1171 which, in turn, are removably coupled, valve housing unit 1171 including a collar 11711 and a connector 11712, one end of connector 11712 being removably coupled to collar 11711 and the other end of connector 11712 being adapted to removably couple to the next collar 11711. The cavity air passage is formed between the collars 11711 and is larger in space than the air passage formed by the slots in the main air spool 114 to accommodate more impurities. Meanwhile, the valve sleeve component is convenient to clean or replace due to the detachable connection mode.

As shown in fig. 11, in order to improve the sealing performance of each air path, the valve housing assembly 117 further includes a first sealing member 1172, an annular groove is disposed on the outer peripheral surface of the collar 11711, the first sealing member 1172 is embedded in the annular groove, and the first sealing member 1172 is used for sealing the collar 11711 and the valve seat 111, so as to avoid air leakage between each air path and improve the reliability of the main air valve 11.

As shown in fig. 10, since the main air valve core 114 performs a reciprocating sliding motion, in order to ensure that each air passage is accurately and reliably communicated when the main air valve core 114 is switched, the main air valve core 114 further includes a second sealing member 1173. An annular groove is formed in the outer peripheral surface of the main gas spool 114, a second seal 1173 is embedded in the annular groove, and the second seal 1173 is used for sealing the main gas spool 114 and the collar 11711.

As shown in fig. 5 and 7, in order to facilitate installation and maintenance of the main air valve 11, the valve seat 111 includes a valve body 112 and an end cover 113, the end of the valve body 112 is provided with an installation passage extending in the axial direction of the main air valve core 114, the main air valve core 114 can be installed through the installation passage, and the end cover 113 is used for closing the installation passage and detachably connected to the valve body 112.

A pneumatic double diaphragm pump comprises a first diaphragm cavity 101, a second diaphragm cavity 102 and the air valve 1, wherein the air valve 1 is arranged between the first diaphragm cavity 101 and the second diaphragm cavity 102, and the air valve 1 is respectively communicated with the first diaphragm cavity 101 and the second diaphragm cavity 102. Because the pneumatic valve 1 has integrateed main air valve 11 and switching-over valve 12, for whole part, pneumatic valve 1 installs in the centre of pneumatic two diaphragm pumps 10, consequently need not to carry out whole disassembling to pneumatic two diaphragm pumps 10, just can get out pneumatic valve 1, conveniently clears up or changes wearing parts to main air valve 11 and switching-over valve 12 simultaneously, also is convenient for symmetrical arrangement internal passage, optimizes the structure. The gas flow direction 100 in an air operated double diaphragm pump is shown by the labeled arrows in fig. 5 and 6.

The working process of the double-diaphragm pump is as follows:

high-pressure compressed air enters the pump from the air inlet 13, enters the first diaphragm cavity 101 through the main air valve core 114 and the first pump cavity channel 1106, pushes the first diaphragm to move leftwards, compresses liquid in the left liquid cavity 103 and discharges the liquid to the liquid discharge port 107, simultaneously pulls the second diaphragm to move leftwards through the connection of the central shaft 105, and forms vacuum in the right liquid cavity 104 to suck the liquid from the liquid inlet 106. When the second diaphragm moves leftwards, the reversing valve core 121 is pushed to move leftwards, so that the air passage is switched, high-pressure air is introduced into the second chamber 116 at one end of the main air valve core 114, meanwhile, the high-pressure air in the first chamber 115 at the other end of the main air valve core 114 is discharged, and the main air valve core 114 slides under the action of pressure difference. When high-pressure compressed air and second pump chamber passageway 1108 communicate, communicate first diaphragm chamber 101 with first exhaust passageway 1107 simultaneously, thereby it aerifys to lead to first diaphragm chamber 101 exhaust second diaphragm chamber 102, the second diaphragm drives first diaphragm and promotes the connecting rod switching-over through center pin 105, arrange right liquid chamber 104 in liquid to leakage fluid dram 107, left liquid chamber 103 inhales liquid from inlet 106 simultaneously, the circulation is reciprocal, only need to last to fill into high-pressure gas in pneumatic double diaphragm pump 10, can form the continuous suction and drainage process automatically.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (12)

1. An air valve comprises a main air valve, a reversing valve, an air inlet and an air outlet, and is characterized in that the main air valve comprises a valve seat and a main air valve core, the main air valve core is arranged in the valve seat and can slide in a reciprocating mode along the axial direction of the main air valve core, the main air valve core and the valve seat form a first cavity and a second cavity, and the first cavity and the second cavity are respectively arranged at two ends of the main air valve core in the axial direction;

the reversing valve is arranged in the valve seat, the first chamber and the second chamber are switched and communicated between the air inlet and the air outlet through the reversing valve, and internal passages among the main air valve, the reversing valve, the air inlet and the air outlet are all located in the valve seat.

2. The gas valve as claimed in claim 1, wherein the reversing valve comprises a reversing valve core, the reversing valve core is arranged in the valve seat and can slide in a reciprocating manner along the axial direction of the reversing valve core, one end of the reversing valve core is used for being abutted against and pushed by a first diaphragm of the pneumatic double-diaphragm pump, and the other end of the reversing valve core is used for being abutted against and pushed by a second diaphragm of the pneumatic double-diaphragm pump.

3. The air valve as claimed in claim 2, wherein a first annular groove and a second annular groove are provided on an outer peripheral surface of the direction change valve spool, the internal passage includes a first exhaust passage, a second exhaust passage, a first switching passage, a second switching passage, and an intake passage, the first exhaust passage and the second exhaust passage are both communicated with the exhaust port, and the intake passage is communicated with the intake port;

one end of the first switching passage communicates with the first chamber, and the other end of the first switching passage switches communication between the first exhaust passage and the intake passage through the first annular groove;

one end of the second switching passage communicates with the second chamber, and the other end of the second switching passage switches communication between the second exhaust passage and the intake passage through the second annular groove.

4. The air valve as claimed in claim 3, wherein the direction valve further comprises a first valve housing, the first valve housing is sleeved on the direction valve core, a plurality of annular flanges are arranged on the outer peripheral surface of the first valve housing, the outer peripheries of the annular flanges abut against the inner wall of the valve seat, annular cavities corresponding to the first exhaust passage, the second exhaust passage, the first switching passage, the second switching passage and the air inlet passage one to one are formed between adjacent annular flanges, and the first exhaust passage, the second exhaust passage, the first switching passage, the second switching passage and the air inlet passage all penetrate through the corresponding annular cavities.

5. The gas valve as claimed in claim 4, wherein the first valve housing further comprises a plurality of first sealing rings, a sealing groove is formed on the outer circumferential surface of the annular flange, the first sealing rings are embedded in the sealing groove, and the first sealing rings are used for sealing the valve housing and the valve seat.

6. The gas valve as claimed in claim 4, wherein the direction changing valve core further comprises a plurality of second sealing rings, a plurality of sealing grooves are arranged on the outer peripheral surface of the direction changing valve core, the second sealing rings are embedded in the sealing grooves, and the second sealing rings are used for sealing the direction changing valve core and the first valve sleeve.

7. The air valve as claimed in claim 1, wherein a third annular groove and a fourth annular groove are formed on the outer peripheral surface of the main air valve core, a first pump chamber passage, a first exhaust passage, a second pump chamber passage and a second exhaust passage are further formed in the valve seat, and the first exhaust passage and the second exhaust passage are both communicated with the exhaust port;

one end of the first pump chamber channel is used for being communicated with a first diaphragm chamber of the pneumatic double-diaphragm pump, and the other end of the first pump chamber channel is switched and communicated between the first exhaust channel and the air inlet through the third annular groove;

one end of the second pump chamber channel is used for being communicated with a second diaphragm chamber of the pneumatic double-diaphragm pump, and the other end of the second pump chamber channel is switched and communicated between the second exhaust channel and the air inlet through the fourth annular groove.

8. The gas valve as recited in claim 1, wherein the main gas valve further comprises a valve sleeve assembly, the outer peripheral surface of the valve sleeve assembly abuts against the inner wall of the valve seat, and the valve sleeve assembly is sleeved on the main gas valve core;

the valve barrel subassembly includes a plurality of valve barrel units, and is a plurality of the connection can be dismantled in proper order to the valve barrel unit, the valve barrel unit includes the lantern ring and connecting piece, the one end of connecting piece can be dismantled connect in the lantern ring, the other end of connecting piece is used for dismantling and connects next the lantern ring.

9. The gas valve as recited in claim 8 wherein the valve housing assembly includes a first seal member, an annular groove is provided on an outer peripheral surface of the collar, the first seal member is fitted in the annular groove, and the first seal member is used to seal the collar with the valve seat.

10. The gas valve as claimed in claim 8, wherein the main gas valve core further comprises a second sealing element, an annular groove is arranged on the outer peripheral surface of the main gas valve core, the second sealing element is embedded in the annular groove, and the second sealing element is used for sealing the main gas valve core and the collar.

11. The gas valve as recited in claim 1, wherein the valve seat includes a valve body having a mounting passage provided at an end thereof, the mounting passage extending in an axial direction of the main gas spool, the main gas spool being mountable through the mounting passage, and an end cap for closing the mounting passage and detachably attached to the valve body.

12. A pneumatic double diaphragm pump, comprising a first diaphragm chamber, a second diaphragm chamber and an air valve according to any of claims 1-11, which air valve is mounted between the first diaphragm chamber and the second diaphragm chamber and which air valve communicates with the first diaphragm chamber and the second diaphragm chamber, respectively.

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