Pilot-operated type electromagnetic valve with double plunger tubes

Abstract

The pilot-operated type double-magnetism-isolating-pipe electromagnetic valve comprises an electromagnetic assembly, the electromagnetic assembly comprises an outer magnetism isolating pipe, an inner magnetism isolating pipe, a movable iron core and an electromagnetic coil, a connecting cavity is formed between the inner magnetism isolating pipe and the outer magnetism isolating pipe, a connecting channel is formed in the lower end of the outer magnetism isolating pipe, and a communicating channel is formed in the upper end of the outer magnetism isolating pipe; the movable iron core is arranged in the inner magnetism isolating tube in a sliding mode, and a control channel is formed between the movable iron core and the inner magnetism isolating tube. When the electromagnetic valve is in a closed state, namely, the electromagnetic coil is in a power-off state, the medium is matched with the sealing spring to drive the piston to move downwards so as to effectively seal the end part of the main outflow channel, and when the electromagnetic valve is in the closed state, namely, the electromagnetic coil is in a power-on state, the piston is driven to move downwards. A medium is difficult to enter the control cavity and apply downward pressure to the piston, so that the electromagnetic valve can be quickly opened and stably kept in an opening state. In other words, the electromagnetic valve has the advantages of being high in response speed and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to a pilot operated solenoid valve, in particular, to a pilot operated solenoid valve with double magnetic isolation tubes. BACKGROUND

[0002] At present, a pilot operated solenoid valve structure with fast response is disclosed in Chinese patent No. CN114458769A, which comprises an electromagnet assembly, a spring assembly, a pilot valve assembly and a main valve assembly.

[0003] The electromagnet assembly comprises a magnetic isolation sleeve, a coil, a compression nut, a tight cap and a nozzle body.

[0004] The pilot valve assembly comprises an armature, a pilot spool and a pilot seal, the pilot seal is nested at the lower end of the pilot spool, the pilot spool is located in the inner hole of the armature, and the armature can drive the pilot spool and the pilot seal to move up and down.

[0005] The spring assembly comprises a spring upper seat, a pilot spring, a return spring, a gasket and a limiting block, the spring upper seat is connected with the lower end of the tight cap in the electromagnet assembly, the limiting block is installed at the inner hole of the nozzle body in the electromagnet assembly, the limiting block is axially limited by the gasket, the two ends of the pilot spring are connected with the spring upper seat and the pilot spool in the pilot valve assembly respectively, the two ends of the return spring are connected with the gasket and the armature in the pilot valve assembly respectively, and the pilot valve assembly can move up and down in the spring assembly.

[0006] The main valve assembly comprises a main valve spool, a main valve seal ring and a main valve seat, the main valve seal ring is located at the sealing groove on the main valve spool, the main valve seat is provided with an inlet channel, the main valve spool is provided with a pressure relief channel and a pilot channel which are parallel to the axis, and the main valve spool can move up and down between the main valve seat and the gasket in the spring assembly.

[0007] The cavity formed by the pilot valve assembly, the tight cap and the magnetic isolation sleeve in the electromagnet assembly is the upper spring cavity, the cavity formed between the main valve assembly and the pilot valve assembly is the control cavity, and the pilot channel communicates the inlet channel and the control cavity.

[0008] After power on, the electromagnet assembly generates suction force, the pilot valve assembly moves upward against the spring force of the pilot spring, the sealing surface A27 is separated to make the control cavity and the back pressure cavity communicate through the pressure relief channel, the pressure in the control cavity is reduced through the pressure relief channel, the main valve spool moves upward after the pressure difference between the inlet channel and the control cavity is generated, and the sealing B1 end surface and the sealing B2 end surface are separated to make the medium in the inlet channel flow to the back pressure cavity.

[0009] However, after the electromagnet assembly is powered on, the medium will continuously enter the control cavity through the pilot channel and be discharged through the pressure relief channel, which will affect the response speed and reliability of the solenoid valve. SUMMARY

[0010] Therefore, the present application aims to provide a pilot electromagnetic valve with double magnetic separation tubes, which has the advantages of fast response speed and high reliability.

[0011] To solve the above technical problems, the technical scheme of the present application is as follows: a pilot electromagnetic valve with double magnetic separation tubes, comprising a main valve assembly and an electromagnetic assembly. A main inflow channel is formed at the front end of the main valve assembly, a main outflow channel is formed at the rear end of the main valve assembly, a control chamber is formed inside the main valve assembly, the control chamber is connected to the main inflow channel and the main outflow channel, a sealing spring and a piston are arranged in the control chamber, the sealing spring drives the piston to seal the front end of the main outflow channel by elastic force. An installation groove is formed at the upper end of the main valve assembly, a secondary inflow channel is formed at the front inside of the main valve assembly, the two ends of the secondary inflow channel are respectively connected to the main inflow channel and the installation groove, a filtering mechanism is arranged in the secondary inflow channel, the filtering mechanism is used to filter the medium flowing through the secondary inflow channel, a pressurization channel is formed at the middle inside of the main valve assembly, the two ends of the pressurization channel are respectively connected to the installation groove and the control chamber, a secondary outflow channel is formed at the rear inside of the main valve assembly, the two ends of the secondary outflow channel are respectively connected to the installation groove and the main outflow channel. The electromagnetic assembly comprises an outer magnetic separation tube, an inner magnetic separation tube, a movable iron core and an electromagnetic coil, the lower end of the outer magnetic separation tube is arranged in the installation groove, the inner magnetic separation tube is arranged in the outer magnetic separation tube, and a connection chamber is formed between the inner magnetic separation tube and the outer magnetic separation tube, a connection channel is formed at the lower end of the outer magnetic separation tube, the two ends of the connection channel are respectively connected to the connection chamber and the secondary inflow channel, a communication channel is formed at the upper end of the outer magnetic separation tube, the two ends of the communication channel are respectively connected to the connection chamber and the inner cavity of the inner magnetic separation tube, the movable iron core is slidingly arranged in the inner magnetic separation tube, a control channel is formed between the movable iron core and the inner magnetic separation tube, the two ends of the control channel are respectively connected to the communication channel and the pressurization channel, the electromagnetic coil is arranged outside the outer magnetic separation tube, when the electromagnetic coil is powered on, the movable iron core moves upward and seals the communication channel, when the electromagnetic coil is powered off, the movable iron core moves downward and seals the secondary outflow channel.

[0012] When the electromagnetic coil is in the power-off state, the movable iron core moves downward and seals the upper end of the auxiliary outflow channel. In this state, the medium in the main inflow channel will flow through the auxiliary inflow channel, the connecting channel, the connecting chamber, the communication channel, the control channel, the pressure boosting channel, and finally enter the control chamber under the action of pressure. At this time, the medium in the control chamber will exert a downward pressure on the piston. Thus, the piston will move downward under the action of the elastic force of the sealing spring and the pressure of the medium, and seal the upper end of the main outflow channel.

[0013] When the electromagnetic coil is in the power-off state, the movable iron core moves downward and seals the upper end of the auxiliary outflow channel. In this state, the medium in the main inflow channel will flow through the auxiliary inflow channel, the connecting channel, the connecting chamber, the communication channel, the control channel, the pressure boosting channel, and finally enter the control chamber under the action of pressure. At this time, the medium in the control chamber will exert a downward pressure on the piston. Thus, the piston will move downward under the action of the elastic force of the sealing spring and the pressure of the medium, and seal the upper end of the main outflow channel.

[0014] In summary, when the above-mentioned electromagnetic valve is in the closed state, i.e. the electromagnetic coil is in the power-off state, the medium will drive the piston to move downward with the cooperation of the sealing spring, so as to effectively seal the end of the main outflow channel. When the above-mentioned electromagnetic valve is in the closed state, i.e. the electromagnetic coil is in the power-on state, the medium is difficult to enter the control chamber and exert a downward pressure on the piston. Thus, the above-mentioned electromagnetic valve can be quickly opened and stably maintained in the open state. That is, the above-mentioned electromagnetic valve has the advantages of fast response speed and high reliability.

[0015] The filter mechanism is arranged in the auxiliary inflow channel, which can filter the medium flowing through the auxiliary inflow channel, so that impurities in the medium are not easy to enter between the outer magnetic isolation tube and the inner magnetic isolation tube, which helps to prolong the service life of the above-mentioned electromagnetic valve.

[0016] Preferably, the main valve assembly comprises a valve body and a valve cover, the main inflow channel is arranged at the front end of the valve body, the main outflow channel is arranged at the rear end of the valve body, the mounting groove is arranged at the upper end of the valve cover, the pressure boosting channel is arranged at the middle part of the valve cover, the control chamber is arranged at the lower end of the valve cover, the auxiliary inflow channel comprises an auxiliary inflow section one arranged on the valve body and an auxiliary inflow section two arranged on the valve cover, and the auxiliary outflow channel comprises an auxiliary outflow section one arranged on the valve body and an auxiliary outflow section two arranged on the valve cover.

[0017] By the above technical solution, the main valve assembly is divided into a valve body and a valve cover, so that the main inflow channel, the main outflow channel, the auxiliary inflow channel, the auxiliary outflow channel, and the control chamber can be more conveniently machined.

[0018] Preferably, the secondary inflow section II comprises an introduction flow channel, a connecting flow channel and an outlet flow channel, the lower end of the introduction flow channel penetrates through the lower end of the valve cover towards the end face of the valve body, the upper end of the introduction flow channel extends upward along the axial direction of the control chamber, the front end of the connecting flow channel penetrates through the front end face of the valve cover, the rear end of the connecting flow channel extends rearward along a direction perpendicular to the central axis of the control chamber, and the middle part of the connecting flow channel is in communication with the upper end of the introduction flow channel, the lower end of the outlet flow channel is in communication with the upper part of the rear end of the connecting flow channel, the upper end of the outlet flow channel extends obliquely upward and is in communication with the mounting groove, and the front end of the connecting flow channel is threadedly connected with a sealing plug.

[0019] Through the above technical scheme, the secondary inflow section II is composed of the introduction flow channel, the connecting flow channel and the outlet flow channel, and the lower end of the introduction flow channel penetrates through the lower end of the valve cover, the front end of the connecting flow channel penetrates through the front side wall of the valve cover, and the upper end of the outlet flow channel is in communication with the mounting groove. The secondary inflow section II thus arranged has the advantage of being convenient to process. The sealing plug seals the front end of the connecting flow channel, so that the medium is not easy to flow out from the front end of the connecting flow channel.

[0020] Preferably, the connecting flow channel is provided with a guide rib at each of the two inner side walls, the guide rib extends along the axial direction of the connecting flow channel, the filtering mechanism comprises a collecting frame and a filter screen, the two sides of the collecting frame are recessed to form guide grooves for the guide ribs, the collecting frame is slidably arranged in the connecting flow channel through the two guide grooves, the front end of the collecting frame is rotatably connected with the rear end of the sealing plug, and the filter screen is fixedly arranged on the upper part of the rear end of the collecting frame. When the collecting frame abuts against the rear end of the connecting flow channel, the filter screen covers the lower end of the outlet flow channel.

[0021] Through the above technical scheme, the guide rib and the guide groove cooperate with each other to limit the circumferential rotation of the collecting frame, so as to ensure that the upper end opening of the collecting frame can always be opposite to the lower end of the outlet flow channel. The front end of the collecting frame is rotatably connected with the sealing plug, so that the collecting frame will not rotate with the sealing plug when the sealing plug is rotated to seal the front end of the connecting flow channel. Moreover, the sealing plug can continuously drive the collecting frame to extend into the connecting flow channel during the rotation of the sealing plug, until the rear end of the collecting frame abuts against the rear end of the connecting flow channel. The filter screen is fixedly arranged on the upper part of the rear end of the collecting frame, so that the impurities blocked by the filter screen can fall into the collecting frame. When the collecting frame collects a large amount of impurities, the sealing plug only needs to be rotated in the reverse direction to take out the collecting frame from the connecting flow channel, and the impurities in the collecting frame can be removed.

[0022] Preferably, a blocking slope one is arranged at the lower end of the front side of the collecting frame, a blocking slope two is arranged at the lower end of the rear side of the collecting frame, and the distance between the blocking slope one and the blocking slope two gradually increases from bottom to top, so as to collect the impurities blocked by the filter screen.

[0023] Through the above technical solution, the distance between the blocking slope one and the blocking slope two gradually increases from bottom to top, so as to block the impurities collected in the collecting frame, so as to prevent the impurities from flowing back to the introduction flow channel.

[0024] Preferably, a guiding slope one is arranged at the upper end of the front side of the collecting frame, the guiding slope one is parallel to the blocking slope one, a guiding slope two is arranged at the upper end of the rear side of the collecting frame, and the guiding slope two is parallel to the blocking slope one.

[0025] Through the above technical solution, the guiding slope one and the guiding slope two cooperate with each other, so as to guide the medium to flow from the introduction flow channel to the introduction flow channel.

[0026] Preferably, a slag blocking slope is arranged at the middle part of the collecting frame, the slag blocking slope is parallel to the guiding slope two, the lower end of the slag blocking slope is connected with the lower end of the blocking slope one, and the upper end of the slag blocking slope is located in front of the upper end of the guiding slope two.

[0027] Through the above technical solution, the slag blocking slope and the blocking slope two form a chamber for collecting impurities, so that the impurities are not easy to flow back to the introduction flow channel. The slag blocking slope is parallel to the guiding slope two, so that the slag blocking slope does not easily hinder the flow of the medium.

[0028] Preferably, a connecting ring groove is arranged at the inner side of the mounting groove, and the connecting ring groove connects the auxiliary inflow channel and the connecting channel.

[0029] Through the above technical solution, the connecting ring groove is arranged at the inner side of the mounting groove, so as to keep the auxiliary inflow channel and the connecting channel in effective communication, and the assembly of the electromagnetic valve becomes more convenient.

[0030] Preferably, a receiving groove is arranged at the lower end of the outer magnetic isolation pipe, a reset spring is arranged in the receiving groove, and the two ends of the reset spring are connected with the outer magnetic isolation pipe and the movable iron core respectively. The reset spring drives the movable iron core to seal the auxiliary outflow channel through the elastic force.

[0031] Through the above technical solution, the reset spring can exert a downward elastic force on the movable iron core, so as to drive the movable iron core to quickly reset.

[0032] Preferably, the upper end of the movable iron core is provided with an upper T-shaped groove, an upper sealing block is arranged in the upper T-shaped groove, the upper sealing block is opposite to the end of the communication passage, the lower end of the movable iron core is provided with a lower T-shaped groove, a lower sealing block is arranged in the lower T-shaped groove, the lower sealing block is opposite to the end of the auxiliary outflow passage, the middle part of the movable iron core is provided with a connecting hole, the two ends of the connecting hole are connected with the upper T-shaped groove and the lower T-shaped groove respectively, a pressing spring is arranged in the connecting hole, and the two ends of the pressing spring are connected with the upper sealing block and the lower sealing block respectively, so as to exert an outward elastic force on the upper sealing block and the lower sealing block.

[0033] Through the technical scheme, the pressing spring exerts an outward elastic force on the upper sealing block and the lower sealing block, so that the upper sealing block can effectively seal the end of the communication passage when the electromagnetic coil is powered on, and the lower sealing block can effectively seal the end of the auxiliary outflow passage when the electromagnetic coil is powered off. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Structure diagram of the embodiment Figure 1 ; Figure 2 A enlarged view of A of Figure 1 ; Figure 3 Structure diagram of the embodiment Figure 2 ; Figure 4 B enlarged view of B of Figure 3 .

[0035] Fig. 1, main inflow passage; 2, main outflow passage; 3, main valve assembly; 301, valve body; 302, valve cover; 4, electromagnetic assembly; 41, outer magnetic isolation tube; 42, inner magnetic isolation tube; 43, movable iron core; 44, electromagnetic coil; 5, control chamber; 6, sealing spring; 7, piston; 8, mounting groove; 9, auxiliary inflow passage; 91, auxiliary inflow section one; 92, auxiliary inflow section two; 921, leading flow channel; 922, connecting flow channel; 923, leading flow channel; 10, pressure boosting passage; 11, auxiliary outflow passage; 111, auxiliary outflow section one; 112, auxiliary outflow section two; 12, connecting chamber; 13, connecting passage; 14, communicating passage; 15, control passage; 16, connecting ring groove; 17, receiving groove; 18, return spring; 19, upper T-shaped groove; 20, upper sealing block; 21, lower T-shaped groove; 22, lower sealing block; 23, connecting hole; 24, abutting spring; 25, limiting groove; 26, lower embedding groove; 27, upper embedding groove; 28, guide sleeve; 29, filtering mechanism; 291, collecting frame; 292, filter screen; 30, sealing plug; 31, guide rib; 32, guide channel; 33, blocking inclined surface one; 34, blocking inclined surface two; 35, guiding inclined surface one; 36, guiding inclined surface two; 37, slag blocking inclined plate. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application are further described in detail below with reference to the accompanying drawings, so that the technical scheme of the present application is easier to understand and master.

[0037] A pilot-operated electromagnetic valve with double magnetic isolation tubes, as shown in Figures 1 to 4 , comprises a main valve assembly 3 and an electromagnetic assembly 4 arranged at the upper end of the main valve assembly 3. In use, the on-off state of the main valve assembly 3 can be changed by changing the on-off state of the electromagnetic assembly 4.

[0038] The front end of the main valve assembly 3 is provided with a main inflow passage 1, the rear end of the main valve assembly 3 is provided with a main outflow passage 2, and the inside of the main valve assembly 3 is provided with a control chamber 5 connected with the main inflow passage 1 and the main outflow passage 2. The control chamber 5 is provided with a sealing spring 6 and a piston 7, and the sealing spring 6 drives the piston 7 to seal the front end of the main outflow passage 2 by elastic force.

[0039] The upper end of the main valve assembly 3 is provided with a mounting groove 8. The inside of the main valve assembly 3 is provided with an auxiliary inflow passage 9 at the front side, and the two ends of the auxiliary inflow passage 9 are respectively communicated with the main inflow passage 1 and the mounting groove 8. The auxiliary inflow passage 9 is provided with a filtering mechanism 29 for filtering the medium flowing through the auxiliary inflow passage 9. The inside of the main valve assembly 3 is provided with a pressure boosting passage 10 at the middle section, and the two ends of the pressure boosting passage 10 are respectively connected with the mounting groove 8 and the control chamber 5. The inside of the main valve assembly 3 is provided with an auxiliary outflow passage 11 at the rear side, and the two ends of the auxiliary outflow passage 11 are respectively communicated with the mounting groove 8 and the main outflow passage 2.

[0040] The electromagnetic assembly 4 comprises an outer magnetic isolation tube 41, an inner magnetic isolation tube 42, a movable iron core 43, and an electromagnetic coil 44. The lower end of the outer magnetic isolation tube 41 is arranged in the mounting groove 8. In this embodiment, the lower end of the outer magnetic isolation tube 41 is provided with external threads, and the inner wall of the mounting groove 8 is provided with internal threads, and the external threads are screwed with the internal threads to fixedly connect the outer magnetic isolation tube 41 with the mounting groove 8. The inner magnetic isolation tube 42 is arranged in the outer magnetic isolation tube 41, and a connecting chamber 12 is formed between the inner magnetic isolation tube 42 and the outer magnetic isolation tube 41. The lower end of the outer magnetic isolation tube 41 is provided with a connecting passage 13, and the two ends of the connecting passage 13 are connected with the connecting chamber 12 and the secondary inflow passage 9, respectively. The upper end of the outer magnetic isolation tube 41 is provided with a communicating passage 14, and the two ends of the communicating passage 14 are connected with the connecting chamber 12 and the inner cavity of the inner magnetic isolation tube 42, respectively. The movable iron core 43 is slidingly arranged in the inner magnetic isolation tube 42, and a control passage 15 is formed between the movable iron core 43 and the inner magnetic isolation tube 42, and the two ends of the control passage 15 are connected with the communicating passage 14 and the pressurizing passage 10, respectively. The electromagnetic coil 44 is arranged outside the outer magnetic isolation tube 41, and when the electromagnetic coil 44 is powered on, the movable iron core 43 moves upward and seals the communicating passage 14, and when the electromagnetic coil 44 is powered off, the movable iron core 43 moves downward and seals the secondary outflow passage 11.

[0041] The inner side of the mounting groove 8 is provided with a connecting ring groove 16, and the connecting ring groove 16 connects the secondary inflow passage 9 and the connecting passage 13.

[0042] The lower end of the outer magnetic isolation tube 41 is provided with a receiving groove 17, and the receiving groove 17 is provided with a reset spring 18, and the two ends of the reset spring 18 are connected with the outer magnetic isolation tube 41 and the movable iron core 43, respectively, and the reset spring 18 drives the movable iron core 43 to seal the secondary outflow passage 11 by elastic force.

[0043] The upper end of the movable iron core 43 is provided with an upper T-shaped groove 19, and the upper T-shaped groove 19 is provided with a matched upper sealing block 20, and the upper sealing block 20 is opposite to the end of the communicating passage 14. The lower end of the movable iron core 43 is provided with a lower T-shaped groove 21, and the lower T-shaped groove 21 is provided with a matched lower sealing block 22, and the lower sealing block 22 is opposite to the end of the secondary outflow passage 11. The middle part of the movable iron core 43 is provided with a connecting hole 23, and the two ends of the connecting hole 23 are connected with the upper T-shaped groove 19 and the lower T-shaped groove 21, respectively. The connecting hole 23 is provided with a pressing spring 24, and the two ends of the pressing spring 24 are connected with the upper sealing block 20 and the lower sealing block 22, respectively, so as to apply outward elastic force to the upper sealing block 20 and the lower sealing block 22.

[0044] The upper end of the piston 7 is provided with a limiting groove 25, and the lower end of the sealing spring 6 extends into the limiting groove 25.

[0045] The main valve assembly 3 comprises a valve body 301 and a valve cover 302. The main inflow passage 1 is formed in the front end of the valve body 301, the main outflow passage 2 is formed in the rear end of the valve body 301, the mounting groove 8 is formed in the upper end of the valve cover 302, the pressurizing passage 10 is formed in the middle of the valve cover 302, the control chamber 5 is formed in the lower end of the valve cover 302, the auxiliary inflow passage 9 comprises an auxiliary inflow section one 91 formed in the valve body 301 and an auxiliary inflow section two 92 formed in the valve cover 302, and the auxiliary outflow passage 11 comprises an auxiliary outflow section one 111 formed in the valve body 301 and an auxiliary outflow section two 112 formed in the valve cover 302. The upper end of the auxiliary outflow section one 111 is provided with a lower embedding groove 26, the lower end of the auxiliary outflow section two 112 is provided with an upper embedding groove 27, and the guide sleeve 28 is embedded between the lower embedding groove 26 and the upper embedding groove 27.

[0046] The auxiliary inflow section two 92 comprises an introduction flow channel 921, a connecting flow channel 922 and an outlet flow channel 923. The lower end of the introduction flow channel 921 penetrates the valve cover 302 towards the end face of the valve body 301, and the upper end of the introduction flow channel 921 extends upwards along the axial direction of the control chamber 5. The front end of the connecting flow channel 922 penetrates the front end face of the valve cover 302, the rear end of the connecting flow channel 922 extends rearward along a direction perpendicular to the central axis of the control chamber 5, and the middle part of the connecting flow channel 922 is in communication with the upper end of the introduction flow channel 921. The lower end of the outlet flow channel 923 is in communication with the upper part of the rear end of the connecting flow channel 922, and the upper end of the outlet flow channel 923 extends obliquely upwards and is in communication with the mounting groove 8. The front end of the connecting flow channel 922 is threadedly connected with the sealing plug 30.

[0047] The connecting flow channel 922 is provided with a guide rib 31 at the opposite two inner side walls, and the guide rib 31 extends along the axial direction of the connecting flow channel 922. The filtering mechanism 29 comprises a collecting frame 291 and a filter screen 292. The opposite two sides of the collecting frame 291 are recessed to form guide through grooves 32 for the guide rib 31, and the collecting frame 291 is slidingly arranged in the connecting flow channel 922 through the two guide through grooves 32, and the front end of the collecting frame 291 is rotationally connected with the rear end of the sealing plug 30. The filter screen 292 is fixedly arranged on the upper part of the rear end of the collecting frame 291, and when the collecting frame 291 abuts against the rear end of the connecting flow channel 922, the filter screen 292 covers the lower end of the outlet flow channel 923.

[0048] The lower end of the front side of the collecting frame 291 is provided with a blocking slope 33, and the lower end of the rear side of the collecting frame 291 is provided with a blocking slope 34. The distance between the blocking slope 33 and the blocking slope 34 gradually increases from bottom to top, so as to collect the impurities blocked by the filter screen 292. The upper end of the front side of the collecting frame 291 is provided with a guiding slope 35, which is parallel to the blocking slope 33. The upper end of the rear side of the collecting frame 291 is provided with a guiding slope 36, which is parallel to the blocking slope 33. The middle part of the collecting frame 291 is provided with a slag blocking slope 37, which is parallel to the guiding slope 36. The lower end of the slag blocking slope 37 is connected with the lower end of the blocking slope 33, and the upper end of the slag blocking slope 37 is located in front of the upper end of the guiding slope 36.

[0049] Of course, the above is only a typical example of the present application, and in addition, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A pilot-operated solenoid valve with a double-isolated magnetic tube, characterized by: It comprises a main valve assembly (3) and an electromagnetic assembly (4); The front end of the main valve assembly (3) is provided with a main inlet channel (1), the rear end of the main valve assembly (3) is provided with a main outlet channel (2), the interior of the main valve assembly (3) is provided with a control chamber (5), the control chamber (5) is connected to the main inlet channel (1) and the main outlet channel (2), a sealing spring (6) and a piston (7) are provided in the control chamber (5), and the sealing spring (6) drives the piston (7) to seal the front end of the main outlet channel (2) through elastic force; The upper end of the main valve assembly (3) is provided with a mounting groove (8), the inner front side of the main valve assembly (3) is provided with a secondary inflow channel (9), the two ends of the secondary inflow channel (9) are respectively connected to the main inflow channel (1) and the mounting groove (8), the secondary inflow channel (9) is provided with a filter mechanism (29), the filter mechanism (29) is used to filter the medium flowing through the secondary inflow channel (9), the inner middle section of the main valve assembly (3) is provided with a boosting channel (10), the two ends of the boosting channel (10) are respectively connected to the mounting groove (8) and the control chamber (5), the inner rear side of the main valve assembly (3) is provided with a secondary outflow channel (11), the two ends of the secondary outflow channel (11) are respectively connected to the mounting groove (8) and the main outflow channel (2); The electromagnetic assembly (4) includes an outer magnetic isolation tube (41), an inner magnetic isolation tube (42), a movable iron core (43) and an electromagnetic coil (44); the lower end of the outer magnetic isolation tube (41) is arranged in the mounting groove (8); the inner magnetic isolation tube (42) is arranged in the outer magnetic isolation tube (41); and a connecting chamber (12) is formed between the inner magnetic isolation tube (42) and the outer magnetic isolation tube (41); a connecting channel (13) is provided at the lower end of the outer magnetic isolation tube (41); the two ends of the connecting channel (13) are respectively connected to the connecting chamber (12) and the auxiliary inflow channel (9); the upper end of the outer magnetic isolation tube (41) is provided with a connecting channel (14); the two ends of the connecting channel (14) are respectively connected to the connecting chamber (12) and the auxiliary inflow channel (9); The connecting chamber (12) and the inner cavity of the inner magnetic isolation tube (42) are connected, the movable iron core (43) is slidably arranged in the inner magnetic isolation tube (42), a control channel (15) is formed between the movable iron core (43) and the inner magnetic isolation tube (42), the two ends of the control channel (15) are respectively connected to the connecting channel (14) and the boost channel (10), the electromagnetic coil (44) is arranged on the outside of the outer magnetic isolation tube (41), when the electromagnetic coil (44) is energized, the movable iron core (43) moves up and seals the connecting channel (14), and when the electromagnetic coil (44) is de-energized, the movable iron core (43) moves down and seals the secondary outflow channel (11).

2. A pilot-operated solenoid valve with a double-isolated magnetic tube according to claim 1, characterized in that: The main valve assembly (3) includes a valve body (301) and a valve cover (302), the main inlet channel (1) is opened at the front end of the valve body (301), the main outlet channel (2) is opened at the rear end of the valve body (301), the mounting groove (8) is opened at the upper end of the valve cover (302), the boost channel (10) is opened in the middle of the valve cover (302), the control chamber (5) is opened at the lower end of the valve cover (302), the secondary inlet channel (9) includes a secondary inlet section 1 (91) opened on the valve body (301) and a secondary inlet section 2 (92) opened on the valve cover (302), and the secondary outlet channel (11) includes a secondary outlet section 1 (111) opened on the valve body (301) and a secondary outlet section 2 (112) opened on the valve cover (302).

3. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 2, characterized in that: The auxiliary inflow section 2 (92) includes an inlet flow channel (921), a connecting flow channel (922) and an outlet flow channel (923). The lower end of the inlet flow channel (921) passes through the valve cover (302) toward the end surface of the valve body (301). The upper end of the inlet flow channel (921) extends upward along the axial direction of the control chamber (5). The front end of the connecting flow channel (922) passes through the front end surface of the valve cover (302). The connecting flow channel (922) ) extends backward in a direction perpendicular to the central axis of the control chamber (5), and the middle part of the connecting flow channel (922) is connected to the upper end of the inlet flow channel (921), the lower end of the outlet flow channel (923) is connected to the upper part of the rear end of the connecting flow channel (922), the upper end of the outlet flow channel (923) extends obliquely upward and is connected to the mounting groove (8), and the front end of the connecting flow channel (922) is threadedly connected to a sealing plug (30).

4. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 3, characterized in that: The connecting flow channel (922) is provided with guide ribs (31) on both inner side walls thereof, and the guide ribs (31) extend along the axial direction of the connecting flow channel (922). The filtering mechanism (29) comprises a collecting frame (291) and a filter screen (292). The collecting frame (291) is recessed on both sides thereof to form guide grooves (32) for the guide ribs (31) to be placed therein, and the collecting frame (291) is slidably arranged in the connecting flow channel (922) through the two guide grooves (32). The front end of the collecting frame (291) is rotatably connected to the rear end of the sealing plug (30). The filter screen (292) is fixedly arranged at the upper portion of the rear end of the collecting frame (291). When the collecting frame (291) abuts against the rear end of the connecting flow channel (922), the filter screen (292) covers the lower end of the outlet flow channel (923).

5. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 4, characterized in that: The lower end of the front side of the collection frame (291) is provided with a blocking slope 1 (33), and the lower end of the rear side of the collection frame (291) is provided with a blocking slope 2 (34). The distance between the blocking slope 1 (33) and the blocking slope 2 (34) gradually increases from bottom to top, so as to collect impurities blocked by the filter screen (292).

6. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 5, characterized in that: The upper front end of the collecting frame (291) is provided with a guiding slope 1 (35), and the guiding slope 1 (35) is parallel to the blocking slope 1 (33); the upper rear end of the collecting frame (291) is provided with a guiding slope 2 (36), and the guiding slope 2 (36) is parallel to the blocking slope 1 (33).

7. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 6, characterized in that: A slag blocking inclined plate (37) is provided in the middle of the collecting frame (291), and the slag blocking inclined plate (37) is parallel to the second guiding inclined surface (36). The lower end of the slag blocking inclined plate (37) is engaged with the lower end of the first blocking inclined surface (33), and the upper end of the slag blocking inclined plate (37) is located in front of the upper end of the second guiding inclined surface (36).

8. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 1, characterized in that: A connecting ring groove (16) is provided on the inner side of the installation groove (8), and the connecting ring groove (16) connects the auxiliary inflow channel (9) and the connecting channel (13).

9. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 1, characterized in that: A receiving groove (17) is provided at the lower end of the outer magnetic isolation tube (41), and a return spring (18) is provided in the receiving groove (17). The two ends of the return spring (18) are respectively connected to the outer magnetic isolation tube (41) and the movable iron core (43). The return spring (18) drives the movable iron core (43) to seal the secondary outflow channel (11) through elastic force.

10. The pilot-operated solenoid valve with double magnetic isolation tubes according to claim 1, characterized in that: An upper T-shaped groove (19) is provided at the upper end of the movable iron core (43), and an adapted upper sealing block (20) is provided in the upper T-shaped groove (19), and the upper sealing block (20) is opposite to the end of the communicating channel (14); a lower T-shaped groove (21) is provided at the lower end of the movable iron core (43), and an adapted lower sealing block (22) is provided in the lower T-shaped groove (21), and the lower sealing block (22) is opposite to the end of the secondary outflow channel (11). A connecting hole (23) is provided in the middle of the movable iron core (43), and the two ends of the connecting hole (23) are respectively connected to the upper T-slot (19) and the lower T-slot (21). A pressing spring (24) is provided in the connecting hole (23), and the two ends of the pressing spring (24) are respectively connected to the upper sealing block (20) and the lower sealing block (22) for applying an outward elastic force to the upper sealing block (20) and the lower sealing block (22).

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