阅读说明：本技术 一种阀杆组件、主阀结构及泄压式两位五通电磁换向阀 (Valve rod assembly, main valve structure and pressure relief type two-position five-way electromagnetic reversing valve ) 是由 刘华玲 邱捷 王广建 申铁柱 于 2021-11-17 设计创作，主要内容包括：本发明涉及换向阀技术领域,尤其涉及一种阀杆组件,包括：阀杆,凸出有环状的密封截止结构；中隔套,包括两圈外密封结构、两个侧密封结构以及主体；侧密封结构上设置有第二通道,密封截止结构在阀杆直线运动的过程中,在主体内对其中一侧的侧密封结构上的第二通道进行封堵；阀杆的直线运动因两侧气体对两端产生的压力差而进行。本发明中的阀杆组件适于整体处于受压状态,根据双侧的压力差进行两侧第二通道的开启来进行方向切换,从而可应用于先导结构为常开型的电磁阀换向阀中,耐振动冲击性能好；本发明中还请求保护一种主阀结构及泄压式两位五通电磁换向阀,通过常开型先导配合主阀设计泄压式换向结构,控制安全系数高,不易产生误动作。(The invention relates to the technical field of reversing valves, in particular to a valve rod assembly, which comprises: the valve rod is protruded with an annular sealing stop structure; the middle spacer bush comprises two circles of outer sealing structures, two side sealing structures and a main body; the side sealing structure is provided with a second channel, and the sealing stop structure blocks the second channel on the side sealing structure on one side in the main body in the linear motion process of the valve rod; the linear movement of the valve stem is caused by the pressure difference between the two ends of the two side gas pairs. The valve rod assembly is suitable for being integrally in a pressed state, and the direction switching is carried out by opening the second channels on two sides according to the pressure difference on two sides, so that the valve rod assembly can be applied to the electromagnetic valve reversing valve with a normally-open pilot structure and has good vibration and impact resistance; the invention also discloses a main valve structure and a pressure relief type two-position five-way electromagnetic reversing valve.)

1. The utility model provides a valve rod assembly, its characterized in that installs in the valve body of two five-way electromagnetic directional valves of pressure release formula, includes:

the middle section of the valve rod protrudes outwards around the circumferential direction to form an annular sealing stop structure;

the middle spacer bush comprises two circles of outer sealing structures, two side sealing structures and a main body connected with the outer sealing structures and the side sealing structures;

the outer sealing structures are sealed with the inner wall of the cavity of the valve body, a first channel for gas to enter the main body is formed between the two outer sealing structures, a second channel for gas to flow out of the main body is arranged on the side sealing structure, and the sealing stop structure blocks the second channel on the side sealing structure on one side in the main body in the linear motion process of the valve rod;

wherein the linear motion of the valve stem is performed by a pressure difference between the two sides of the valve stem due to the gas on the two sides.

2. The valve stem assembly of claim 1, further comprising two sets of side spacers symmetrically disposed on opposite sides of the middle spacer, each set comprising a first side spacer attached to the middle spacer and a second side spacer attached to the first side spacer;

the first side spacer bush and the second side spacer bush respectively comprise an outer sealing ring, an inner sealing ring and a ring body structure which is used for installing the outer sealing ring and the inner sealing ring and is internally provided with a through channel; the outer sealing ring is sealed with the inner wall of the cavity of the valve body, and the inner sealing ring is fixed on the inner wall of the ring body structure;

the end part of the valve rod is provided with a tail section with an enlarged diameter; a third channel for gas to flow out of the ring body structure is formed between the outer sealing ring of the first side spacer bush and the outer sealing structure; the inner sealing ring of the first side spacer bush is attached to the tail section on one side moving to the first position to realize sealing when gas flows into the annular structure on one side of the inner sealing ring, and is separated from the tail section on one side moving to the second position to realize sealing release when gas flows into the annular structure on the other side;

the inner side of the ring structure of the first side spacer bush which is unsealed is communicated with the inner side of the ring structure of the second side spacer bush which is on the same side, and a fourth channel for gas to flow out of the ring structure is formed between the second side spacer bush and the inner wall of the cavity.

3. The valve stem assembly of claim 2, wherein the inner seal ring is mounted in a counterbore at one side end of the annulus structure, comprising:

the connecting part, the outer sealing branch and the inner sealing branch are led out from one side of the connecting part and are scattered, and a V-shaped opening facing to a through channel of the ring body structure is formed between the outer sealing branch and the inner sealing branch;

the inner sealing branch is freely stretched or attached to the end section.

4. A main valve structure, wherein the valve stem assembly according to any one of claims 1 to 3 is used, comprising:

the valve body and a combined structure formed by a rear cover piston assembly, a valve rod assembly and a front cover piston assembly which are connected in sequence;

the utility model discloses a piston assembly, including back lid piston assembly, cavity, front cover piston assembly, integrated configuration, straight line motion, perpendicular to in the direction of linear motion, back lid piston assembly is greater than to the gaseous extrusion area of back lid piston cavity back lid piston assembly is to the gaseous extrusion area of front cover piston assembly in the front cover piston cavity, just integrated configuration's straight line motion is gone on because of the gaseous pressure differential that produces both ends piston assembly of both sides.

5. The main valve structure according to claim 4, wherein said chamber is of uniform cross-section in the length direction, inside which is disposed a piston sleeve;

the outer side of the piston sleeve is in sealing fit with the inner wall of the cavity, and the inner side of the piston sleeve is in sealing fit with the front cover piston assembly.

6. A pressure relief type two-position five-way electromagnetic directional valve, which is characterized by comprising a main valve structure as claimed in claim 4, and a pilot assembly;

the valve body is provided with an air inlet, a first working port, a second working port, a pilot air inlet channel and a pilot air outlet channel, air entering from the air inlet enters the front cover piston cavity and the pilot piston cavity of the pilot assembly through the pilot air inlet channel respectively, and the pilot assembly introduces the air in the pilot piston cavity into the atmosphere when the power is on or introduces the air in the rear cover piston cavity through the pilot air outlet channel when the power is off;

the combined structure is switched in position in the process of linear motion, so that the air inlet is communicated with the first working port, or the air inlet is communicated with the second working port.

7. The pressure relief type two-position five-way electromagnetic directional valve according to claim 6, characterized in that the pilot assembly comprises:

the pilot seat is fixedly connected with the valve body, and is internally provided with an inflow channel communicated with the pilot gas inlet channel and an outflow channel communicated with the pilot gas outlet channel;

one end of the magnetism isolating pipe is fixedly connected with the pilot base;

the lower static iron core, the movable iron core and the upper static iron core are sequentially arranged in the magnetism isolating pipe, the lower static iron core and the upper static iron core are fixedly arranged relative to the magnetism isolating pipe, a pilot piston cavity is formed between the lower static iron core and the magnetism isolating pipe, and the lower static iron core is provided with a fifth channel communicated with the inflow channel and the magnetism isolating pipe and a sixth channel communicated with the inflow channel and the outflow channel; the upper static iron core is provided with a seventh channel communicated with the inside of the magnetism isolating pipe and the external atmospheric environment;

the electromagnetic component is used for enabling the movable iron core to be attached to the lower static iron core through electromagnetic suction force generated after the coil is electrified and plugging the fifth channel;

the reset structure is used for extruding the movable iron core and keeping away from the lower static iron core after the coil is powered off, and is attached to the upper static iron core, and the seventh channel is blocked.

8. The pressure relief type two-position five-way electromagnetic directional valve according to claim 7, characterized in that two ends of the axis of the movable iron core are respectively provided with an upper rubber plug attached to the upper static iron core and a lower rubber plug attached to the lower static iron core.

9. The pressure relief type two-position five-way electromagnetic directional valve according to claim 7, characterized in that the pilot assembly further comprises a nut fixedly connected with the electromagnetic assembly and provided with a through hole site communicating the inside and the outside;

the nut is internally provided with an internal thread hole, the upper static iron core is connected with the internal thread hole through external threads and is relative to the nut for fixing, and the magnetism isolating pipe is extruded after being fixed.

10. The pressure relief type two-position five-way electromagnetic directional valve according to claim 9, further comprising a manual adjustment structure for manually opening the seventh passage, comprising:

the adjusting rod is attached to the hole position on the nut and moves linearly under the guidance of the hole position;

the end part of the adjusting rod is led out of the nut for operation, and a limiting structure is arranged on the periphery of the adjusting rod and used for limiting the maximum leading-out length of the adjusting rod relative to the nut;

the upper static iron core is provided with a containing cavity for containing the end part of the adjusting rod, the end part of the adjusting rod faces to the seventh channel, and the seventh channel allows the adjusting rod to penetrate through to extrude the movable iron core;

the reset spring is sleeved outside the adjusting rod, one end of the reset spring is abutted to the bottom of the containing cavity, and the other end of the reset spring is abutted to the limiting structure and is arranged in a compression state.

Technical Field

The invention relates to the technical field of reversing valves, in particular to a valve rod assembly, a main valve structure and a pressure relief type two-position five-way electromagnetic reversing valve.

Background

At present, for a two-position five-way electromagnetic reversing valve of a cut-off type, a pilot part structure of the two-position five-way electromagnetic reversing valve generally adopts a normally closed structure, the pilot part is in a closed state in a power-off state, pilot gas is opened when power is on, and a valve rod part of the electromagnetic valve is pushed to realize reversing action.

In view of the above problems, the present designer is based on the practical experience and professional knowledge that are abundant over many years in engineering application of such products, and is actively making research and innovation in cooperation with the application of the theory, so as to design a valve rod assembly, a main valve structure and a pressure relief type two-position five-way electromagnetic directional valve.

Disclosure of Invention

The invention provides a valve rod assembly which can effectively solve the problems in the background art. Meanwhile, the invention also discloses a main valve structure and a pressure relief type two-position five-way electromagnetic directional valve, and the main valve structure and the pressure relief type two-position five-way electromagnetic directional valve have the same technical effect.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a valve rod assembly, installs in the valve body of two five-way electromagnetic directional valves of pressure release formula, includes:

the middle section of the valve rod protrudes outwards around the circumferential direction to form an annular sealing stop structure;

the middle spacer bush comprises two circles of outer sealing structures, two side sealing structures and a main body connected with the outer sealing structures and the side sealing structures;

the outer sealing structures are sealed with the inner wall of the cavity of the valve body, a first channel for gas to enter the main body is formed between the two outer sealing structures, a second channel for gas to flow out of the main body is arranged on the side sealing structure, and the sealing stop structure blocks the second channel on the side sealing structure on one side in the main body in the linear motion process of the valve rod;

wherein the linear motion of the valve stem is performed by a pressure difference between the two sides of the valve stem due to the gas on the two sides.

The two groups of side spacer sleeves are symmetrically arranged on two sides of the middle spacer sleeve and respectively comprise a first side spacer sleeve attached to the middle spacer sleeve and a second side spacer sleeve attached to the first side spacer sleeve;

the first side spacer bush and the second side spacer bush respectively comprise an outer sealing ring, an inner sealing ring and a ring body structure which is used for installing the outer sealing ring and the inner sealing ring and is internally provided with a through channel; the outer sealing ring is sealed with the inner wall of the cavity of the valve body, and the inner sealing ring is fixed on the inner wall of the ring body structure;

the end part of the valve rod is provided with a tail section with an enlarged diameter; a third channel for gas to flow out of the ring body structure is formed between the outer sealing ring of the first side spacer bush and the outer sealing structure; the inner sealing ring of the first side spacer bush is attached to the tail section on one side moving to the first position to realize sealing when gas flows into the annular structure on one side of the inner sealing ring, and is separated from the tail section on one side moving to the second position to realize sealing release when gas flows into the annular structure on the other side;

the inner side of the ring structure of the first side spacer bush which is unsealed is communicated with the inner side of the ring structure of the second side spacer bush which is on the same side, and a fourth channel for gas to flow out of the ring structure is formed between the second side spacer bush and the inner wall of the cavity.

Further, the inner sealing ring is installed in the countersunk hole site of one side end of the ring structure, and includes:

the connecting part, the outer sealing branch and the inner sealing branch are led out from one side of the connecting part and are scattered, and a V-shaped opening facing to a through channel of the ring body structure is formed between the outer sealing branch and the inner sealing branch;

the inner sealing branch is freely stretched or attached to the end section.

A main valve structure employing a valve stem assembly as described above, comprising:

the valve body and a combined structure formed by a rear cover piston assembly, a valve rod assembly and a front cover piston assembly which are connected in sequence;

the utility model discloses a piston assembly, including back lid piston assembly, cavity, front cover piston assembly, integrated configuration, straight line motion, perpendicular to in the direction of linear motion, back lid piston assembly is greater than to the gaseous extrusion area of back lid piston cavity back lid piston assembly is to the gaseous extrusion area of front cover piston assembly in the front cover piston cavity, just integrated configuration's straight line motion is gone on because of the gaseous pressure differential that produces both ends piston assembly of both sides.

Furthermore, the cavity is of a uniform cross-section structure in the length direction, and a piston sleeve is arranged inside the cavity;

the outer side of the piston sleeve is in sealing fit with the inner wall of the cavity, and the inner side of the piston sleeve is in sealing fit with the front cover piston assembly.

A pressure relief type two-position five-way electromagnetic directional valve comprises a main valve structure and a pilot assembly;

the valve body is provided with an air inlet, a first working port, a second working port, a pilot air inlet channel and a pilot air outlet channel, air entering from the air inlet enters the front cover piston cavity and the pilot piston cavity of the pilot assembly through the pilot air inlet channel respectively, and the pilot assembly introduces the air in the pilot piston cavity into the atmosphere when the power is on or introduces the air in the rear cover piston cavity through the pilot air outlet channel when the power is off;

the combined structure is switched in position in the process of linear motion, so that the air inlet is communicated with the first working port, or the air inlet is communicated with the second working port.

Further, the pilot assembly includes:

the pilot seat is fixedly connected with the valve body, and is internally provided with an inflow channel communicated with the pilot gas inlet channel and an outflow channel communicated with the pilot gas outlet channel;

one end of the magnetism isolating pipe is fixedly connected with the pilot base;

the lower static iron core, the movable iron core and the upper static iron core are sequentially arranged in the magnetism isolating pipe, the lower static iron core and the upper static iron core are fixedly arranged relative to the magnetism isolating pipe, a pilot piston cavity is formed between the lower static iron core and the magnetism isolating pipe, and the lower static iron core is provided with a fifth channel communicated with the inflow channel and the magnetism isolating pipe and a sixth channel communicated with the inflow channel and the outflow channel; the upper static iron core is provided with a seventh channel communicated with the inside of the magnetism isolating pipe and the external atmospheric environment;

the electromagnetic component is used for enabling the movable iron core to be attached to the lower static iron core through electromagnetic suction force generated after the coil is electrified and plugging the fifth channel;

the reset structure is used for extruding the movable iron core and keeping away from the lower static iron core after the coil is powered off, and is attached to the upper static iron core, and the seventh channel is blocked.

Further, the both ends of moving the iron core axis be provided with respectively with go up the rubberizing of quiet iron core laminating stifled, and with the lower gluey of quiet iron core laminating is stifled down.

Furthermore, the pilot assembly also comprises a nut which is fixedly connected with the electromagnetic assembly and is provided with a through hole site communicated with the inside and the outside;

the nut is internally provided with an internal thread hole, the upper static iron core is connected with the internal thread hole through external threads and is relative to the nut for fixing, and the magnetism isolating pipe is extruded after being fixed.

Further, still include manual regulation structure for carrying out manual opening to the seventh passageway, include:

the adjusting rod is attached to the hole position on the nut and moves linearly under the guidance of the hole position;

the end part of the adjusting rod is led out of the nut for operation, and a limiting structure is arranged on the periphery of the adjusting rod and used for limiting the maximum leading-out length of the adjusting rod relative to the nut;

the upper static iron core is provided with a containing cavity for containing the end part of the adjusting rod, the end part of the adjusting rod faces to the seventh channel, and the seventh channel allows the adjusting rod to penetrate through to extrude the movable iron core;

the reset spring is sleeved outside the adjusting rod, one end of the reset spring is abutted to the bottom of the containing cavity, and the other end of the reset spring is abutted to the limiting structure and is arranged in a compression state.

Through the technical scheme of the invention, the following technical effects can be realized:

the valve rod assembly is suitable for being integrally in a pressed state, and the direction switching is carried out by alternatively opening the second channels on two sides according to the pressure difference received by the end parts on two sides, so that the valve rod assembly can be applied to the electromagnetic valve reversing valve with a normally open pilot structure, and has good vibration and impact resistance.

Meanwhile, a specific structural form that the linear motion of the valve rod is carried out due to the pressure difference formed by the gas on the two sides to the piston assembly is given, the extrusion area of the rear cover piston assembly to the gas in the rear cover piston cavity is larger than that of the front cover piston assembly to the gas in the front cover piston cavity, so that under the same air pressure, the gas thrust generated at the end part of the rear cover piston assembly is larger than that generated at the end part of the front cover piston assembly, the linear motion of the combined structure is generated due to the pressure difference, and the valve rod assembly acts on the front cover piston assembly; when the rear cover piston cavity is free of air pressure, the end part of the rear cover piston assembly is free of air thrust, the air thrust of the end part of the front cover piston assembly still exists, and the front cover piston assembly pushes the valve rod assembly to move towards one side of the rear cover piston cavity under the action of the air thrust, so that the air passage switching is completed.

The normally open type pilot valve is matched with the main valve to design the pressure relief type reversing structure, the control safety coefficient is high, the electromagnetic pilot part is opened in a normal state, the rear cover piston cavity and the front cover piston cavity in the valve body are filled with gas, the valve rod assembly is controlled to be kept through the area difference of the front cover piston assembly and the rear cover piston assembly, the whole valve is in a pressed state, misoperation is not easy to occur, and the safety and reliability are high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a valve stem configuration;

FIG. 2 is a schematic view of the connection of the valve stem to the spacer sleeve;

FIG. 3 is a schematic structural view of a spacer sleeve;

FIG. 4 is a cross-sectional view of the middle spacer, a set of side spacers and the valve stem after they are connected;

FIG. 5 is a schematic illustration of the valve stem assembly;

FIG. 6 is a schematic view of another operating state of FIG. 4;

FIG. 7 is an exploded view of the first side spacer and the second side spacer;

FIG. 8 is a schematic structural view of the inner seal ring;

FIG. 9 is a cross-sectional view of the inner seal ring after attachment to the support gasket;

FIG. 10 is a cross-sectional view of the main valve structure in a first operating condition;

FIG. 11 is an enlarged view of a portion of FIG. 10 at A;

FIG. 12 is an enlarged view of a portion of FIG. 10 at B;

FIG. 13 is an exploded schematic view of the rear cap piston assembly and valve stem assembly;

FIG. 14 is a schematic illustration of the piston sleeve configuration;

FIG. 15 is a schematic view (partially shown) of FIG. 10 in another operating state;

FIG. 16 is a cross-sectional view of a pressure relief type two-position five-way solenoid directional valve;

FIG. 17 is a schematic structural view of a pressure relief type two-position five-way electromagnetic directional valve;

FIG. 18 is a front view of a pressure relief type two-position five-way solenoid directional valve;

FIG. 19 is a cross-sectional view of the pilot assembly;

FIG. 20 is a cross-sectional view of the pilot assembly coupled to the valve body;

FIG. 21 is an enlarged view of a portion of FIG. 20 at C;

FIG. 22 is a schematic view showing the connection of the pilot mount, the flux barrier, the lower stationary core and the upper stationary core;

FIG. 23 is a schematic view of the connection of the lower stationary core, the movable core and the upper stationary core;

FIG. 24 is an enlarged view of a portion of FIG. 22 at E;

FIG. 25 is an enlarged view of a portion of FIG. 20 at D;

FIG. 26 is a cross-sectional view of the upper stationary core, the nut, and the manual adjustment mechanism shown coupled together;

FIG. 27 is a schematic view of the connection of the nut and the manual adjustment mechanism;

reference numerals:

1. a valve body; 11. a rear cap piston cavity; 12. a front cover piston cavity; 13. an air inlet; 14. a first working port; 15. a second working port; 16. a pilot inlet passage; 17. a pilot air outlet channel; 18. a first exhaust port; 19. a second exhaust port;

2. a rear cap piston assembly;

3. a valve stem assembly; 31. a valve stem; 31a, an intermediate section; 31b, end segment; 31c, sealing a stop structure; 32. a middle spacer bush; 32a, an outer seal structure; 32b, a side sealing structure; 32c, a first channel; 32d, a second channel; 32e, a body; 33. a first side spacer sleeve; 33a, an outer sealing ring; 33b, an inner seal ring; 33b-1, a linking moiety; 33b-2, outer sealing branch; 33b-3, inner sealing branch; 33b-4, and is opened in a V shape; 33c, a ring structure; 33d, a third channel; 33e, a fourth channel; 34. a second side spacer sleeve; 35. a support gasket; 35a, a gasket ring; 35b, a support ring; 35c, sealing the cavity;

4. a front cap piston assembly;

5. a pilot assembly; 51. a pilot base; 51a, an inflow channel; 51b, an outflow channel; 52. a magnetism isolating pipe; 53. a lower stationary core; 53a, a fifth channel; 53b, sixth channel; 54. a movable iron core; 54a, gluing and blocking; 54b, gluing and blocking; 55. an upper stationary core; 55a, a seventh channel; 55b, a cavity; 56. an electromagnetic assembly; 57. a nut; 58. a reset structure;

6. a piston sleeve;

7. a manual adjustment structure; 71. adjusting a rod; 72. a return spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

As shown in fig. 1-3, a valve rod assembly is installed in valve body 1 of two five-way electromagnetic directional valves of pressure release formula, includes:

a valve rod 31, wherein an annular sealing stopping structure 31c protrudes outwards from the middle section 31a of the valve rod 31 in the circumferential direction; the middle spacer 32 comprises two circles of outer sealing structures 32a, two side sealing structures 32b and a main body 32e connected with the two side sealing structures; the outer sealing structures 32a are sealed with the inner wall of the cavity of the valve body 1, a first channel 32c for gas to enter the main body 32e is formed between the two outer sealing structures 32a, a second channel 32d for gas to flow out of the main body 32e is arranged on the side sealing structure 32b, and the second channel 32d on the side sealing structure 32b on one side is blocked in the main body 32e by the sealing stop structure 31c in the process of linear movement of the valve rod 31; the linear movement of the valve rod 31 is caused by a pressure difference between the two ends of the gas pair on both sides.

The valve rod assembly 3 is suitable for being wholly in a pressed state, and the direction switching is carried out by selectively opening the second passages 32d on two sides according to the pressure difference on two sides, so that the valve rod assembly can be applied to the electromagnetic valve reversing valve with a normally open pilot structure, has good vibration and impact resistance, is not easy to generate misoperation, and has high safety and reliability.

During operation, the position of the middle spacer 32 is basically kept unchanged, the entering gas enters the main body 32e under the restriction of the two outer sealing structures 32a, and the operation selection of supplying gas to the second channel 32d on the side is realized through the movement selection of the valve rod 31, so that the communication between the middle spacer 32 and one side is realized.

The outer sealing structure 32a may be a conventional O-ring, and the side sealing structure 32b may be an independent gasket attached to the sidewall of the main body 32e, or may be a part of the main body 32e, and the second channel 32d is formed by forming a hole.

Specifically, as an optimized form, referring to fig. 3, the middle spacer 32 is an annular main body 32e, an annular retraction area is arranged outside the main body 32e, a plurality of through holes are uniformly formed in the retraction area around the axis, the through holes are used as the first channel 32c, the side sealing structure 32b is attached to two sides of the main body 32e, an O-shaped sealing ring is sleeved on the periphery of the side sealing structure 32b to serve as the outer sealing structure 32a, and one side of the O-shaped sealing ring is limited by the side wall of the main body 32 e. The gas entering from the gas inlet of the reversing valve reaches the space between the retraction area and the inner wall of the cavity and enters the main body 32e from the through hole; above-mentioned structural style's well spacer 32 structure is more stable, and admits air more evenly, and more importantly, each independent structure is easily processed more to obtain higher precision more easily.

As shown in fig. 4 to 6, the present invention preferably further includes two sets of side spacers symmetrically disposed on two sides of the middle spacer 32, and respectively including a first side spacer 33 attached to the middle spacer 32 and a second side spacer 34 attached to the first side spacer 33; the first side spacer 33 and the second side spacer 34 both comprise an outer sealing ring 33a, an inner sealing ring 33b and a ring body structure 33c which is used for mounting the outer sealing ring and the inner sealing ring and is internally provided with a through channel; the outer sealing ring 33a is sealed with the inner wall of the cavity of the valve body 1, and the inner sealing ring 33b is fixed on the inner wall of the ring body structure 33 c.

The end of the valve stem 31 is provided with an enlarged diameter end section 31 b; a third channel 33d for the gas to flow out of the ring structure 33c is formed between the outer sealing ring 33a and the outer sealing structure 32a of the first side spacer 33; the inner sealing ring 33b of the first side spacer 33 is attached to the end section 31b of one side moving to the first position to realize sealing when the gas flows into the annular structure 33c of one side where the inner sealing ring is located, and is separated from the end section 31b of one side moving to the second position to realize sealing release when the gas flows into the annular structure 33c of the other side; the inner side of the ring structure 33c of the first side spacer 33 which is unsealed is communicated with the inner side of the ring structure 33c of the second side spacer 34 on the same side, and a fourth channel 33e for gas to flow out of the ring structure 33c is formed between the second side spacer 34 and the inner wall of the cavity.

In operation, referring to fig. 4, as shown by the dotted line, a schematic diagram of the gas from the inlet of the reversing valve flowing into the annular structure 33c of the left first side spacer 33 is shown, at this time, the sealing stop structure 31c of the valve rod 31 is attached to the right side sealing structure 32b to realize sealing, and the inner sealing ring 33b of the side first side spacer 33 is attached to the end section 31b of the valve rod 31 to realize sealing.

When the valve rod 31 moves, referring to fig. 6, as shown by the dotted line, a schematic view of the communication between the inner parts of the annular structures 33c of the first side spacer 33 and the second side spacer 34 is shown, and at this time, the inner sealing ring 33b of the first side spacer 33 is unsealed from the end section 31b of the valve rod 31.

The structure of the valve rod assembly 3 is further optimized in the preferred scheme, and as a more simplified mode, the first side spacer 33 and the second side spacer 34 can be set to be identical in structure, as shown in fig. 5, so that the processing difficulty is reduced, and the universality is realized.

In the above embodiment, the outer sealing ring 33a may also be in the form of an O-ring, so that the outer sealing forms for the center spacer 32 and the side spacers are kept uniform, and the complexity of the parts is reduced. In order to reduce the influence of the internal leakage on the control accuracy due to the existence of the movement form of the valve rod 31, as shown in fig. 6 to 8, the preferred embodiment described above is that the inner sealing ring 33b is installed in a countersunk hole at one end of the ring structure 33c, and includes: the connecting part 33b-1, and an outer sealing branch 33b-2 and an inner sealing branch 33b-3 which are led out from one side of the connecting part 33b-1 and are in a scattered shape, and a V-shaped opening 33b-4 facing a through channel of the ring body structure 33c is formed between the two branches; the inner sealing branch 33b-3 is free to stretch or otherwise conform to the end segment 31 b.

In the process of using, the connecting portion 33b-1 can be attached and fixed by any structure such as a cover body adjacent to the side spacer or other side spacers, so as to be stably limited in the countersunk hole site, and for the V-shaped opening 33b-4, see fig. 8, it faces to the direction of gas supply, i.e. the direction of the right straight line arrow in the figure, so as to bear the impact force caused by the gas flow, in the above process, the inner sealing branch 33b-3 is necessarily attached to the end section 31b, and since the V-shaped opening 33b-4 faces to the through channel, a greater expansion tendency is obtained with the outer sealing branch 33b-2 under the action of the gas flow as indicated by the upper and lower arrows in the figure, so that the sealing effect of the inner side and the outer side is better.

Since the outer sealing branch 33b-2 protrudes from the connecting portion 33b-1 to be sealed with the end section 31b, a guiding slope form is formed between the outer sealing branch and the connecting portion 33b-1, and the slope form can guide the arrival of the end section 31b during the movement of the valve rod 31, so that the damage probability caused by the impact of the valve rod 31 is reduced, and preferably, an approximately parallel slope form can be arranged between the middle section 31a and the end section 31b of the valve rod 31. The sealing structure is not easy to wear, the action of the valve rod 31 is not easy to generate foreign matter clamping stagnation faults, and the service life is long.

In the above-described structural form, since the V-shaped opening 33b-4 extends outward by a certain distance with respect to the connecting portion 33b-1, the pressing force to the end section 31b is small due to flexibility of itself; in order to avoid the internal leakage which may occur in the above-mentioned situation, as a preferable mode, as shown in fig. 9, a support gasket 35 may be further added, which includes a gasket ring 35a disposed perpendicularly to the axis of the valve stem 31, and a support ring 35b connected to the inner side of the gasket ring 35a and disposed in a trumpet-like divergent manner; the gasket ring 35a is squeezed between the outer sealing branch 33b-2 and the bottom of the counter sink, the end of the support ring 35b is attached to the middle of the inner sealing branch 33b-3, the V-shaped opening 33b-4 is divided into a sealing cavity 35c and a new V-shaped opening, and the support ring 35b is smoothly protruded in curvature towards the outside of the V-shaped opening before being pressed.

When the supporting sealing gasket 35 bears the pressure direction indicated by the arrow in the drawing in the working process, the supporting ring 35b tends to extend and straighten under the action of pressure, so as to extrude the position attached to the inner sealing branch 33b-3 and achieve the purpose of supporting the inner sealing branch 33b-3, so as to improve the extrusion force of the supporting ring on the tail section 31b and improve the sealing effect.

When the valve rod 31 presses the inner sealing branch 33b-3 from the direction opposite to the arrow in the figure, the inner sealing branch 33b-3 presses the support ring 35b to expand the bending degree thereof, the external force required in the process is small, and therefore, excessive reaction force cannot be caused to the inner sealing branch 33b-3, and the inner sealing branch 33b-3 cannot expand outwards to avoid the effect of shearing damage by the valve rod 31 from being affected. In order to ensure the accuracy of the supporting position of the supporting ring 35b, a step structure can be arranged on the inner side of the inner sealing branch 33b-3 for limiting.

Example two

As shown in fig. 10 to 13, a main valve structure using the valve stem assembly 3 of the first embodiment includes:

the valve comprises a valve body 1 and a combined structure consisting of a rear cover piston assembly 2, a valve rod assembly 3 and a front cover piston assembly 4 which are sequentially connected; back lid piston assembly 2 forms back lid piston cavity 11 with cavity one end, protecgulum piston assembly 4 forms protecgulum piston cavity 12 with the cavity other end, integrated configuration is along linear motion, and in the direction of perpendicular to linear motion, back lid piston assembly 2 is greater than protecgulum piston assembly 4 to the gaseous extrusion area in protecgulum piston cavity 12 to the gaseous extrusion area in the protecgulum piston assembly 11, and integrated configuration's linear motion goes on because of the gaseous pressure differential to both ends piston assembly production of both sides.

In the present embodiment, a specific structural form is given that can enable the linear motion of the valve rod 31 to be performed due to the pressure difference between the gases on the two sides in the first embodiment, that is, because the extrusion area of the back cover piston assembly 2 to the gas in the back cover piston cavity 11 is larger than the extrusion area of the front cover piston assembly 4 to the gas in the front cover piston cavity 12, under the same air pressure, as shown in fig. 10, the air thrust generated at the end of the back cover piston assembly 2 is larger than the air thrust generated at the end of the front cover piston assembly 4, so that the linear motion of the combined structure occurs due to the pressure difference, and the valve rod assembly 3 moves towards the front cover piston assembly 4; when the rear cover piston cavity 11 has no air pressure, the end of the rear cover piston assembly 2 has no air thrust, and the end of the front cover piston assembly 4 still has air thrust, as shown in fig. 15, the front cover piston assembly 4 pushes the valve rod assembly 3 to move towards the rear cover piston cavity 11 side under the action of the air thrust, so that the switching of the air passages is completed.

In the present embodiment, during the process of establishing the outer peripheral seal of the piston assembly, the structural form of the inner sealing ring 33b optimized in the first embodiment may also be adopted, and a better sealing effect may also be achieved, wherein, preferably, the V-shaped opening faces to the side of the piston cavity. Wherein, can design a grease groove on the piston, be used for storing lubricating grease when installing and using, make the piston sealing washer be in lubricated state in long-term reciprocating motion, the sealing washer is difficult for wearing and tearing under lubricated state, and the life-span is more permanent.

In order to reduce the processing difficulty of the valve body 1, the cavity is of a uniform cross-section structure in the length direction, and a piston sleeve 6 is arranged inside the cavity; the outer side of the piston sleeve 6 is in sealing fit with the inner wall of the cavity, and the inner side of the piston sleeve is in sealing fit with the front cover piston assembly 4. Referring to the structure of the piston sleeve 6 in fig. 14, through the arrangement of the piston sleeve 6, a cavity can be obtained by directly processing a through hole with a uniform cross section for the valve body 1, the process is simpler, the size difference between the front cover piston assembly 4 and the rear cover piston assembly 2 is adapted through the installation of the piston sleeve 6, and the effective sealing and fitting on two sides are ensured.

EXAMPLE III

As shown in fig. 16 to 18, a pressure relief type two-position five-way electromagnetic directional valve includes a main valve structure in the second embodiment, and a pilot assembly 5; the valve body 1 is provided with an air inlet 13, a first working port 14, a second working port 15, a pilot air inlet channel 16 and a pilot air outlet channel 17, air entering from the air inlet 13 enters a front cover piston cavity 12 and a pilot piston cavity of the pilot assembly 5 through the pilot air inlet channel 16 respectively, and the pilot assembly 5 introduces the air in the pilot piston cavity into the atmosphere when being electrified or introduces the air in a rear cover piston cavity 11 through the pilot air outlet channel 17 when being powered off; the combined structure is switched in position in the process of linear motion, so that the air inlet 13 is communicated with the first working port 14, or the air inlet 13 is communicated with the second working port 15.

As shown in fig. 16, the communication between the air inlet 13 and the first working port 14 is illustrated, as shown by the dotted line, and the communication is illustrated, and the process of obtaining the communication is as follows:

a part of the gas flowing in from the gas inlet 13 enters the front cover piston cavity 12 to generate acting force towards the end part of the valve rod 31 on the front cover piston assembly 4; the other part of the gas enters the pilot assembly 5, is introduced into the rear cover piston cavity 11 through the pilot gas outlet channel 17, and generates acting force towards the end part of the valve rod 31 for the rear cover piston assembly 2, because the extrusion area of the rear cover piston assembly 2 to the gas in the rear cover piston cavity 11 is larger than the extrusion area of the front cover piston assembly 4 to the gas in the front cover piston cavity 12, the gas thrust generated by pressing the end part of the rear cover piston assembly 2 by the same gas is larger than the gas thrust generated by pressing the end part of the front cover piston assembly 4, so that linear motion of the combined structure is generated due to pressure difference, the valve rod 31 assembly acts towards the front cover piston assembly 4, the gas inlet 13 is communicated with the first working port 14, and the second working port 15 is communicated with the second gas outlet 19.

In the process, the pilot assembly 5 is not powered, a normally open pilot is designed to be matched with the main valve to design a pressure relief type reversing structure, the control safety factor is high, the electromagnetic pilot part is opened in a normal state, the rear cover piston cavity 11 and the front cover piston cavity 12 in the valve body 1 are both filled with gas, the valve rod 31 assembly is controlled to be kept through the area difference of the front cover piston assembly 2 and the rear cover piston assembly 2, the whole valve is in a pressed state, the vibration and impact resistance performance is good, the misoperation is not easy to generate, and the safety and reliability are high.

Referring to fig. 15, the communication between the air inlet 13 and the second working port 15 is shown, as indicated by the dotted line, and the communication is shown, and the process of obtaining this is as follows:

when the pilot assembly 5 is powered on, the pilot assembly acts, the air introduced into the rear cover piston cavity 11 through the pilot air outlet channel 17 in the process is introduced into the atmosphere, so that the rear cover piston cavity 11 has no air pressure, the end part of the rear cover piston assembly 2 has no air thrust, the air thrust at the end part of the front cover piston assembly 4 still exists, the front cover piston assembly 4 is pushed by the air thrust to move the valve rod 31 assembly to one side of the rear cover piston cavity 11, the switching of air channels is completed, the air inlet 13 is communicated with the second working port 15, and the first working port 14 is communicated with the first exhaust port 18.

In the invention, a large-small piston assembly structure is designed, gas exists in piston cavities at two ends of a combined structure in a normal state, the position of a valve rod 31 assembly is controlled by a gas thrust difference value generated by the large and small piston assemblies, and in a power-on state, the gas thrust at the end part of the piston assembly at one end is removed, so that the action reversing of the valve rod 31 assembly is realized, namely, the action switching of the electromagnetic reversing valve is realized by discharging the pressure at one end.

In the above embodiment, a belleville spring structure may be further provided to compensate for length deviation generated by the cooperative installation of the plurality of spacer assemblies and the valve body 1, and it is ensured that no axial gap is generated when the spacer assemblies are installed in the cavity of the valve body 1.

As shown in fig. 19 to 25, the pilot assembly 5 preferably includes: the pilot seat 51 is fixedly connected with the valve body 1, and is internally provided with an inflow channel 51a communicated with the pilot inlet channel 16 and an outflow channel 51b communicated with the pilot outlet channel 17; one end of the magnetism isolating pipe 52 is fixedly connected with the pilot base 51; the lower static iron core 53, the movable iron core 54 and the upper static iron core 55 are sequentially arranged inside the magnetism isolating pipe 52, the lower static iron core 53 and the upper static iron core 55 are fixedly arranged relative to the magnetism isolating pipe 52, and a pilot piston cavity is formed between the lower static iron core 53 and the upper static iron core 55; the lower stationary core 53 is provided with a fifth passage 53a communicating the inflow passage 51a with the inside of the magnetism isolating pipe 52, and a sixth passage 53b communicating the inside of the magnetism isolating pipe 52 with the outflow passage 51 b; the upper static iron core 55 is provided with a seventh channel 55a communicating the inside of the magnetism isolating pipe 52 with the outside atmosphere; the electromagnetic assembly 56 is used for enabling the movable iron core 54 to be attached to the lower static iron core 53 by electromagnetic attraction generated after the coil is electrified and plugging the fifth channel 53 a; the reset structure 58, after the coil is powered off, extrudes the movable iron core 54 to keep away from the lower static iron core 53, and is attached to the upper static iron core 55, so as to block the seventh channel 55 a.

In order to achieve better sealing effect, two ends of the axis of the movable iron core 54 are respectively provided with an upper glue plug 54a attached to the upper static iron core 55 and a lower glue plug 54b attached to the lower static iron core.

In the working process, when the coil is electrified, the electromagnetic attraction force generated by the electromagnetic coil attracts the movable iron core 54 to overcome the extrusion force of the reset structure 58 to act and attract the lower static iron core 53 together, at this time, the movable iron core 54 can be separated from the upper static iron core 55 through the upper rubber plug 54a arranged on the movable iron core, and attract the lower static iron core 53 together through the lower rubber plug 54b arranged on the movable iron core to generate sealing, so that the pilot air inlet at the pilot seat 51 is cut off; the upper rubber plug 54a of the movable iron core 54 is opened to be in air-tight seal with the upper static iron core 55 and communicated with the atmosphere, the air in the rear cover piston cavity 11 reaches the seventh channel 55a of the upper static iron core 55 through the pilot air outlet channel 17 and then is exhausted to the atmosphere, at this time, the rear cover piston cavity 11 has no air pressure, the rear cover piston assembly 2 has no air thrust, the air thrust of the front cover piston assembly 4 still exists, the front cover piston assembly 4 pushes the valve rod 31 to move towards the rear cover piston cavity 11 under the action of the air thrust until the sealing cut-off surface on the other side of the sealing cut-off structure 31c of the valve rod 31 touches the side sealing structure 32b on the same side to form cut-off sealing, the electromagnetic valve completes one power-on reversing action, at the moment, the air inlet 13 is communicated with the second working port 15, and the first working port 14 is communicated with the first exhaust port 18.

In order to facilitate the processing and installation of the structure, the pilot assembly 5 further comprises a nut 57 which is fixedly connected with the electromagnetic assembly 56 and is provided with a through hole site for communicating the inside and the outside; the nut 57 is internally provided with a female screw hole, and the upper stationary core 55 is fixed to the nut 57 by connection of an external screw and the female screw hole, and presses the flux barrier 52 after the fixation.

During the installation process, the fixed connection between the upper stationary core 55 and the nut 57 can be firstly established, then the connection between the nut 57 and the electromagnetic assembly 56 can be established, and then the upper stationary core 55 is rotated to axially press the magnetic isolation tube 52, thereby ensuring the position stability of the whole partial structure of the pilot assembly 5 in the axial direction.

To facilitate manual control, as shown in fig. 26 and 27, a manual adjustment mechanism 7 is further included for manually opening the seventh passage 55a, including: the adjusting rod 71 is attached to the hole position on the nut 57 and moves linearly under the guidance of the hole position; the end part of the adjusting rod 71 is led out of the nut 57 for operation, and the periphery of the adjusting rod 71 is provided with a limiting structure for limiting the maximum led-out length of the adjusting rod 71 relative to the nut 57; the upper static iron core 55 is provided with a cavity 55b for accommodating the end part of the adjusting rod 71, the end part of the adjusting rod 71 faces to the seventh channel 55a, and the seventh channel 55a allows the adjusting rod 71 to penetrate through to extrude the movable iron core 54; and the return spring 72 is sleeved outside the adjusting rod 71, one end of the return spring abuts against the bottom of the accommodating cavity 55b, and the other end of the return spring abuts against the limiting structure and is arranged in a compressed state.

Through the structure, the seventh channel 55a can be manually opened, and only by squeezing the leading-out part of the adjusting rod 71 through external force to overcome the elastic force of the return spring 72, the adjusting rod 71 squeezes the movable iron core 54 to be attached to the lower static iron core 53.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.