Pilot valve integrated with internal and external pilot control functions

Abstract

The utility model discloses a pilot valve integrated with internal and external pilot control functions, which comprises a pilot valve seat, a coil assembly is connected onto the pilot valve seat, the coil assembly comprises a coil body, a movable iron core and a static iron core, the static iron core is fixedly arranged in the coil body, the movable iron core is movably arranged in the coil body, and the movable iron core is connected with the static iron core. A pilot valve cavity, a first valve cavity, a pilot valve port and an inner pilot air channel are formed in the pilot valve seat, a first air inlet is formed in the pilot valve seat and communicated with the pilot valve port through the inner pilot air channel, the movable iron core is provided with a first plug matched with the pilot valve port in a sealing mode, and an iron core spring matched with the movable iron core in an abutting mode is arranged in the pilot valve cavity. An outer pilot air channel is further arranged in the pilot valve seat, a second air inlet is formed in the pilot valve seat, the second air inlet is communicated with the pilot valve cavity through the outer pilot air channel, the pilot valve cavity is communicated with the first valve cavity, the universality of the pilot valve is high, and by additionally arranging the outer pilot air channel, the pilot valve can be opened under the conditions that power is cut off and the pilot valve cannot be touched by hands.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pilot valve, especially to a pilot valve integrated with internal and external pilot control functions. BACKGROUND

[0002] On the current market, the control mode of pneumatic electromagnetic valve is mainly divided into two kinds, one is to adopt internal pilot air source control, and the other is to adopt external pilot air source control. The pneumatic electromagnetic valve is generally composed of a pilot valve and a main valve, and the pilot valve is connected with the main valve. In the structure of the pneumatic electromagnetic valve, the gas inlet of the main valve is usually connected to a positive pressure air source. In this case, the pilot valve can be designed with an internal pilot air passage and obtain the positive pressure air source through the gas inlet of the main valve, or the pilot valve can be designed with an external pilot air passage, i.e. to obtain the positive pressure air source through an external air source, without directly obtaining the air source through the gas inlet of the main valve. On the market, the pilot valve is designed in two different ways, i.e. with internal pilot air passage and external pilot air passage. However, in general, the pilot valve is only provided with one of the two pilot air passages, and the more common one is the pilot valve with internal pilot air passage. The main advantage of this design is that it can share the gas inlet of the main valve to obtain the positive pressure air source, simplifying the system structure. However, when the pilot valve only uses the internal pilot air passage, it cannot be normally opened in case of power failure or other emergency situations, and the pilot valve cannot be manually controlled in time. Therefore, it is necessary to improve it. SUMMARY

[0003] The utility model discloses to the defects and insufficient of prior art, provide a kind of pilot valve integrated with internal and external pilot control functions, simple and reasonable structure, easy operation, pilot valve not only is provided with internal pilot air passage but also is provided with external pilot air passage, when main valve gas inlet connects positive pressure air source, internal pilot air passage can be used, external pilot air passage can be used, when main valve gas inlet connects negative pressure air source, the pilot valve can be controlled main valve to realize reversing function by external pilot air passage, the versatility of pilot valve is high, by increasing external pilot air passage, pilot valve can be opened in the case of power failure, hand cannot be touched, it is convenient to control.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model discloses a pilot valve integrated with inside and outside pilot control function, including pilot valve seat, be connected with coil assembly on the pilot valve seat, the coil assembly includes coil body, moving core and static core, the static core is fixedly arranged in the coil body, the moving core is movably arranged in the coil body and is matched with the static core, be equipped with pilot valve chamber, first valve chamber, pilot valve port and inside pilot air channel in the pilot valve seat, is provided with first air inlet on the pilot valve seat, first air inlet is passed through inside pilot air channel and is linked with pilot valve port, the moving core is inserted into pilot valve chamber and is provided with the first plug that is sealed with pilot valve port cooperation, is provided with the iron core spring that is matched with the moving core in pilot valve chamber, the moving core can reciprocate between first station and second station, make first plug open or seal pilot valve port, pilot valve port is passed through first plug and is linked with pilot valve chamber, still be provided with outside pilot air channel in the pilot valve seat, be provided with second air inlet on the pilot valve seat, second air inlet is passed through outside pilot air channel and is linked with pilot valve chamber, pilot valve chamber is linked with first valve chamber.

[0006] Further, the side wall of the pilot valve seat is provided with a manual lever, a first mounting groove for mounting the manual lever is arranged in the pilot valve seat, a first spring is arranged in the first mounting groove, the first spring is in abutting cooperation with the manual lever and makes the manual lever have an upward movement trend, one end of the manual lever is inserted into the pilot valve chamber and is in abutting cooperation with the moving core, the other end of the manual lever is extended out of the side wall of the pilot valve seat and is provided with a knob part.

[0007] Further, a first limiting step in limiting cooperation with the knob part is arranged in the first mounting groove.

[0008] Further, a tab cooperating with the manual lever is arranged on the pilot valve seat, a slot in plug-in cooperation with the tab and a recess connected with the slot are arranged on the side wall of the manual lever.

[0009] Further, a first sealing ring is arranged between the manual lever and the first mounting groove, and a groove corresponding to the first sealing ring is arranged on the outer side wall of the manual lever.

[0010] Further, a one-way valve is arranged in the second air inlet, the one-way valve comprises a one-way base, a second spring, a steel ball and an air inlet seat, the one-way base is inserted into the second air inlet and is fixedly connected with the second air inlet, the air inlet seat is fixedly arranged in the one-way base, an air inlet hole is formed in the air inlet seat, the second spring and the steel ball are movably arranged between the air inlet seat and the one-way base, one end of the second spring is in abutting cooperation with the one-way base, the other end of the second spring is in abutting cooperation with the steel ball and makes the steel ball have a movement trend of sealing the air inlet hole.

[0011] Further, a second sealing ring is arranged between the air inlet seat and the steel ball, and the steel ball is in sealing cooperation with the second sealing ring.

[0012] Further, the outer side wall of the one-way base is provided with a limiting protrusion, and the inner wall of the second air inlet is provided with a limiting groove matched with the limiting protrusion.

[0013] Further, the first air inlet is provided with a third sealing ring.

[0014] Further, the coil assembly further comprises a sleeve, the coil body is arranged outside the sleeve, the static iron core is fixedly arranged in the sleeve, the moving iron core is movably arranged in the sleeve, the static iron core is provided with an exhaust passage, and the moving iron core is provided with a second plug head for sealing the exhaust passage on one end close to the static iron core.

[0015] The beneficial effects of the utility model are as follows: the pilot valve with the internal and external pilot control functions, the pilot valve is provided with not only the internal pilot air channel but also the external pilot air channel, can adapt to the main valve of different working forms, when the main valve air inlet connects the positive pressure gas source, can adopt the internal pilot air channel, also can adopt the external pilot air channel, when the main valve air inlet connects the negative pressure gas source, the pilot valve can control the main valve to realize the reversing function through the external pilot air channel, need not additionally design the pilot valve used in cooperation with the main valve, the pilot valve is high in universality, the pilot valve is further provided with a manual lever, the design of the manual lever allows the user to manually open the pilot valve under the condition of power failure, through the increase of the external pilot air channel, the main valve can realize the reversing under the negative pressure, and through the increase of the external pilot air channel, the pilot valve can be opened under the condition that the power failure and the manual operation cannot be reached, is convenient to control. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the cross section structure schematic diagram under the first visual angle of the utility model;

[0017] Figure 2 It is Figure 1 It is the enlarged structure schematic diagram of A in the utility model;

[0018] Figure 3 It is Figure 1 It is the enlarged structure schematic diagram of B in the utility model;

[0019] Figure 4 It is the cross section structure schematic diagram under the second visual angle of the utility model;

[0020] Figure 5 It is the structure schematic diagram of the utility model;

[0021] Figure 6 It is the structure schematic diagram of the manual lever under the third visual angle;

[0022] Figure 7 It is the structure schematic diagram of the manual lever under the fourth visual angle;

[0023] Figure 8 is the sectional structure schematic view of the utility model under the working condition;

[0024] Figure 9 is the sectional structure schematic view of the valve body.

[0025] Figures 1-9 Middle: 1, pilot valve seat;11, first air inlet;111, third sealing ring;12, second air inlet;13, inner pilot air channel;14, outer pilot air channel;15, pilot valve cavity;16, first valve cavity;17, pilot valve port;2, coil assembly;21, coil body;211, coil nut;2111, exhaust hole;22, moving iron core;221, first plug;222, second plug;223, third spring;23, static iron core;231, exhaust passage;24, sleeve;241, fourth sealing ring;25, iron core spring;26, junction box;261, screw;3, pressing plate;4, manual rod;41, knob part;42, first sealing ring;43, insertion slot;44, recessed part;45, first spring;46, recess;5, insertion sheet;6, one-way valve;61, one-way base;611, limiting protrusion;62, second spring;63, steel ball;64, air inlet seat;641, air inlet hole;65, air inlet connector;66, second sealing ring;7, main valve;71, main valve air inlet;72, first working port;73, second working port;74, first exhaust port;75, second exhaust port;76, valve stem;77, first piston;78, second piston;79, third pilot air channel. DETAILED DESCRIPTION

[0026] The utility model will be further explained in connection with the drawings.

[0027] As Figures 1-9The shown pilot valve integrated with internal and external pilot control functions comprises a pilot valve seat 1, a coil assembly 2 connected to the pilot valve seat 1, the coil assembly 2 comprising a coil body 21, a moving iron core 22 and a static iron core 23, the static iron core 23 fixedly arranged in the coil body 21, the moving iron core 22 movably arranged in the coil body 21 and matched with the static iron core 23, the pilot valve seat 1 being provided with a pilot valve cavity 15, a first valve cavity 16, a pilot valve port 17 and an internal pilot air channel 13, the pilot valve cavity 15 being communicated with the first valve cavity 16, specifically, the pilot valve seat 1 is provided with a through hole for communicating the pilot valve cavity 15 and the first valve cavity 16, the moving iron core 22 extending into the pilot valve cavity 15 and being provided with a first plug 221 sealingly matched with the pilot valve port 17, the pilot valve cavity 15 being provided with an iron core spring 25 abutting with the moving iron core 22, the moving iron core 22 reciprocating between a first station and a second station so that the first plug 221 opens or seals the pilot valve port 17, the pilot valve port 17 being communicated with the pilot valve cavity 15 through the first plug 221, referring to Figures 4-5 , the end face of the pilot valve seat 1 is provided with a first air inlet 11, the first air inlet 11 being communicated with the pilot valve port 17 through the internal pilot air channel 13, preferably, the first air inlet 11 is provided with a third sealing ring 111, which can improve the sealing effect and prevent air leakage, specifically, in this embodiment, when the coil body 21 is not electrified, the moving iron core 22 is located at the first station, at this time, the moving iron core 22 is sealingly matched with the pilot valve port 17 under the elastic force of the iron core spring 25, the pilot valve port 17 is closed, and the gas source in the internal pilot air channel 13 cannot enter the pilot valve cavity 15 through the pilot valve port 17; when the coil body 21 is electrified, a magnetic field is generated, at this time, the moving iron core 22 is attracted to the static iron core 23 by force to overcome the elastic force of the iron core spring 25, at this time, the moving iron core 22 moves to the second station, a gap is formed between the first plug 221 and the pilot valve port 17, the pilot valve port 17 is opened, at this time, the gas source in the internal pilot air channel 13 enters the pilot valve cavity 15 and the first valve cavity 16 in sequence through the pilot valve port 17; referring to Figure 1 , the pilot valve seat 1 is further provided with an external pilot air channel 14, the side wall of the pilot valve seat 1 is provided with a second air inlet 12, the second air inlet 12 is communicated with the pilot valve cavity 15 through the external pilot air channel 14, the gas source in the external pilot air channel 14 enters the first valve cavity 16 through the pilot valve cavity 15.

[0028] The utility model discloses a pilot valve integrated with inside and outside pilot control function, pilot valve inside not only is provided with inside pilot air channel 13 still is provided with outside pilot air channel 14, can adapt to the main valve 7 of different working form, when the main valve air inlet 71 connects positive pressure gas source, can use inside pilot air channel 13, also can use outside pilot air channel 14, when the main valve air inlet 71 connects negative pressure gas source, this pilot valve can control the main valve 7 through outside pilot air channel 14 to realize the reversing function, need not additionally design the pilot valve of cooperation with the main valve 7, and the pilot valve is high in universality, through increasing outside pilot air channel 14, make the main valve 7 can realize reversing under negative pressure, and through increasing outside pilot air channel 14, can open the pilot valve under the condition that power failure, human hand cannot reach.

[0029] Preferably, in the embodiment, the side wall of the pilot valve seat 1 is provided with a manual rod 4, and the first installation groove for installing the manual rod 4 is arranged in the pilot valve seat 1. The first spring 45 is arranged in the first installation groove, and the first spring 45 is in abutting cooperation with the manual rod 4 and makes the manual rod 4 have an upward movement trend. The first spring 45 can be used for resetting the manual rod 4. One end of the manual rod 4 extends into the pilot valve cavity 15 and is in abutting cooperation with the moving iron core 22. The other end of the manual rod 4 extends out of the side wall of the pilot valve seat 1 and is provided with a knob part 41. Preferably, in the embodiment, the first installation groove is provided with a first limiting step in limiting cooperation with the knob part 41, so as to limit the stroke of the downward movement of the manual rod 4. When needed, the user can press down the manual rod 4 through the knob part 41, so as to push the moving iron core 22 to move, open the pilot valve port 17, and the design of the manual rod 4 allows the user to manually open the pilot valve in the case of power failure.

[0030] Preferably, in the embodiment, referring to Figure 1 , the pilot valve seat 1 is provided with a plug 5 in cooperation with the manual rod 4, referring to Figures 6-7 , the side wall of the manual rod 4 is provided with a plug groove 43 in plug cooperation with the plug 5 and a recess 44 connected with the plug groove 43. This structure design not only enhances the connection strength between the manual rod 4 and the pilot valve seat 1, but also provides additional positioning and limiting functions.

[0031] Preferably, in the embodiment, referring to Figure 1 , the first sealing ring 42 is arranged between the manual rod 4 and the first installation groove, so as to improve the sealing performance and prevent air leakage. The outer side wall of the manual rod 4 is provided with a groove 46 corresponding to the first sealing ring 42, so as to avoid that the first sealing ring 42 is undesirably detached.

[0032] Preferably, in the embodiment, referring to Figure 2The second air inlet 12 is provided with a one-way valve 6, the one-way valve 6 comprises a one-way base 61, a second spring 62, a steel ball 63 and an air inlet seat 64, the one-way base 61 extends into the second air inlet 12 and is fixedly connected with the second air inlet 12, the air inlet seat 64 is fixedly arranged in the one-way base 61, an air inlet hole 641 is formed in the air inlet seat 64, the second spring 62 and the steel ball 63 are movably arranged between the air inlet seat 64 and the one-way base 61, one end of the second spring 62 abuts against the one-way base 61, the other end of the second spring 62 abuts against the steel ball 63 and makes the steel ball 63 have a movement tendency of sealing the air inlet hole 641, so as to prevent the air pressure from leaking from the second air inlet 12 when the inner pilot air passage 13 is used, and affecting the use.

[0033] Preferably, in the embodiment, the air inlet seat 64 is further connected with an air inlet connector 65, the air inlet connector 65 extends into the one-way base 61 and abuts against the air inlet seat 64, so as to ensure the stability and reliability of the connection.

[0034] Preferably, in the embodiment, in order to ensure that the sealing performance of the one-way valve 6 is more reliable, the air inlet seat 64 is further provided with a second sealing ring 66 between the air inlet seat 64 and the steel ball 63, the steel ball 63 is sealingly matched with the second sealing ring 66, and the gas leakage is further prevented.

[0035] Preferably, in the embodiment, a limiting protrusion 611 is arranged on the outer side wall of the one-way base 61, and a limiting groove is arranged on the inner wall of the second air inlet 12 and is limitingly matched with the limiting protrusion 611, the limiting protrusion 611 and the limiting groove are limitingly matched, so as to avoid that the one-way base 61 is undesirably separated from the second air inlet 12 and affects the use.

[0036] Preferably, in the embodiment, referring to Figure 1 The coil assembly 2 further comprises a sleeve 24 and a junction box 26, the junction box 26 is connected to the coil body 21, the junction box 26 and the coil body 21 are fixedly connected through a screw 261, so as to ensure the stability and reliability of the connection, the coil body 21 is arranged outside the sleeve 24, the static iron core 23 is fixedly arranged in the sleeve 24, and the dynamic iron core 22 is movably arranged in the sleeve 24, the static iron core 23 is provided with an exhaust passage 231, the coil body 21 is further provided with a coil nut 211, the coil nut 211 is fixedly connected with the static iron core 23, the coil nut 211 is further provided with an exhaust hole 2111, the gas in the exhaust passage 231 is discharged through the exhaust hole 2111, one end of the dynamic iron core 22 close to the static iron core 23 is provided with a second plug 222 for sealing the exhaust passage 231, and a third spring 223 is arranged between the first plug 221 and the second plug 222, so as to provide necessary elastic force.

[0037] Referring to Figure 3In order to further improve the sealing performance, the sleeve 24 is provided with a fourth sealing ring 241 between the pilot valve seat 1.

[0038] Referring to Figure 8 It is the cross-sectional structure schematic diagram of the double electric control electromagnetic valve, the double electric control electromagnetic valve includes the main valve 7, the main valve 7 is respectively provided with main valve air inlet 71, first working port 72, second working port 73, first exhaust port 74 and second exhaust port 75, the both sides of main valve 7 are respectively provided with the pilot valve integrated with the internal and external pilot control function, the first valve cavity 16 of left side pilot valve is provided with the first piston 77, the first valve cavity 16 of right side pilot valve is provided with the second piston 78, the valve rod 76 is movably arranged in the main valve 7, the both ends of valve rod 76 are respectively abutted with first piston 77 and second piston 78, valve rod 76 can reciprocate between third station and fourth station, specifically, it has multiple control modes, the first control mode is as follows, when the pilot valve of one side of double electric control electromagnetic valve is electrified, the main valve 7 can be reversed, the second control mode is as follows, when the user presses the manual rod 4 of one side pilot valve, the main valve 7 can be reversed, the third control mode is as follows, when the external air inlet connector 65 of one side pilot valve is quickly connected with compressed gas, the compressed gas directly enters the first chamber of corresponding pilot valve, and the main valve 7 can be reversed, it needs to be explained that when the main valve 7 is started by the third mode, the main valve air inlet 71 can be connected with negative pressure gas source, and in the first control mode and the second control mode, the main valve air inlet 71 cannot be connected with negative pressure gas source, and needs to be connected with positive pressure gas source, in addition, it needs to be explained that when the pilot valve adopts internal pilot airway 13, referring to Figure 9 The main valve 7 is provided with third pilot airway 79 corresponding to the pilot valve, the pilot valve is provided with two, the third pilot airway 79 is also provided with two corresponding, the third pilot airway 79 is connected with first air inlet 11 of pilot valve and main valve air inlet 71 respectively, and when the pilot valve adopts internal pilot airway 13, the main valve air inlet 71 cannot be connected with negative pressure gas source, when the pilot valve adopts external pilot airway 14, the main valve 7 does not set third pilot airway 79 or needs to block third pilot airway 79, when the pilot valve adopts external pilot airway 14, the main valve air inlet 71 can be connected with negative pressure gas source.

[0039] The above only is the preferred implementation of the utility model, therefore, the equivalent change or modification of the structure, feature and principle, which is described in the utility model patent application range, is included in the utility model patent application range.

Claims

1. A pilot valve integrated with inner and outer pilot control functions, comprising a pilot valve seat (1), a coil assembly (2) connected to the pilot valve seat (1), the coil assembly (2) comprising a coil body (21), a moving iron core (22) and a static iron core (23), the static iron core (23) being fixedly arranged in the coil body (21), the moving iron core (22) being movably arranged in the coil body (21) and cooperating with the static iron core (23), the pilot valve seat (1) being provided with a pilot valve cavity (15), a first valve cavity (16), a pilot valve port (17) and an inner pilot air passage (13), the pilot valve seat (1) being provided with a first air inlet (11), the first air inlet (11) being in communication with the pilot valve port (17) through the inner pilot air passage (13), the moving iron core (22) extending into the pilot valve cavity (15) and being provided with a first plug (221) sealingly cooperating with the pilot valve port (17), the pilot valve cavity (15) being provided with an iron core spring (25) abutting against the moving iron core (22), the moving iron core (22) being reciprocable between a first position and a second position to open or seal the pilot valve port (17) by the first plug (221), the pilot valve port (17) being in communication with the pilot valve cavity (15) through the first plug (221), characterized in that: The pilot valve seat (1) is further provided with an outer pilot air channel (14), and the pilot valve seat (1) is provided with a second air inlet (12), which is communicated with a pilot valve cavity (15) through the outer pilot air channel (14), and the pilot valve cavity (15) is communicated with a first valve cavity (16).

2. The pilot valve integrated with the inner and outer pilot control functions according to claim 1, characterized in that: The side wall of the pilot valve seat (1) is provided with a manual rod (4), and the pilot valve seat (1) is provided with a first mounting groove for mounting the manual rod (4), and the first mounting groove is provided with a first spring (45), which is in abutting cooperation with the manual rod (4) and makes the manual rod (4) have an upward movement trend, one end of the manual rod (4) extends into the pilot valve cavity (15) and is in abutting cooperation with a moving iron core (22), and the other end of the manual rod (4) extends out of the side wall of the pilot valve seat (1) and is provided with a knob part (41).

3. The pilot valve integrated with the inner and outer pilot control functions according to claim 2, characterized in that: The first mounting groove is provided with a first limiting step in limiting cooperation with the knob part (41).

4. The pilot valve integrated with the inner and outer pilot control functions according to claim 2, characterized in that: The pilot valve seat (1) is provided with a tab (5) in cooperation with the manual rod (4), and the side wall of the manual rod (4) is provided with a slot (43) in plug-in cooperation with the tab (5) and a recess (44) connected with the slot (43).

5. The pilot valve integrated with the inner and outer pilot control functions according to claim 2, characterized in that: The first sealing ring (42) is arranged between the manual rod (4) and the first mounting groove, and the outer side wall of the manual rod (4) is provided with a groove (46) in corresponding cooperation with the first sealing ring (42).

6. The pilot valve integrated with the inner and outer pilot control functions according to claim 1, characterized in that: The second air inlet (12) is provided with a one-way valve (6), which comprises a one-way base (61), a second spring (62), a steel ball (63) and an air inlet seat (64), the one-way base (61) extends into the second air inlet (12) and is fixedly connected with the second air inlet (12), the air inlet seat (64) is fixedly arranged in the one-way base (61), the air inlet seat (64) is provided with an air inlet hole (641), and the second spring (62) and the steel ball (63) are movably arranged between the air inlet seat (64) and the one-way base (61), one end of the second spring (62) abuts against the one-way base (61), and the other end of the second spring (62) abuts against the steel ball (63) and makes the steel ball (63) have a movement trend of sealing the air inlet hole (641).

7. The pilot valve integrated with the inner and outer pilot control functions according to claim 6, characterized in that: The second sealing ring (66) is further arranged between the air inlet seat (64) and the steel ball (63), and the steel ball (63) is in sealing cooperation with the second sealing ring (66).

8. The pilot valve integrated with the inner and outer pilot control functions according to claim 6, characterized in that: The outer side wall of the one-way base (61) is provided with a limiting protrusion (611), and the inner wall of the second air inlet (12) is provided with a limiting groove in limiting cooperation with the limiting protrusion (611).

9. The pilot valve integrated with the inner and outer pilot control functions according to claim 1, characterized in that: The first air inlet (11) is provided with a third sealing ring (111).

10. The pilot valve integrated with the inner and outer pilot control functions according to claim 1, characterized in that: The coil assembly (2) further comprises a sleeve (24), the coil body (21) is arranged outside the sleeve (24), the static iron core (23) is fixedly arranged in the sleeve (24), the moving iron core (22) is movably arranged in the sleeve (24), the static iron core (23) is provided with an exhaust passage (231), and the moving iron core (22) is provided with a second plug (222) for sealing the exhaust passage (231) on one end close to the static iron core (23).

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