阅读说明：本技术 一种安全阀 (Safety valve ) 是由 黄延军 邵玉刚 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种安全阀,包括阀体,所述阀体内设有上端开口的阀腔,所述阀体的圆周侧面设有与阀腔连通的出口管,所述阀体的底部设有与阀腔连通的进口管；所述阀腔内设有主阀座；所述阀腔的上端开口处固定安装有阀盖,所述阀盖设有竖直向下延伸的套管；所述套管上套接有第一弹簧；所述套管内滑动连接有主控制杆,所述套管设有竖直滑槽,所述主阀芯与套管转动连接的内侧壁上设有第一螺旋槽,所述主控制杆的圆周侧面设有第一凸柱；所述套管内设有第二弹簧；所述阀盖内设有先导阀组件；该安全阀不仅结构简单,而且避免了主阀芯由于加工误差累计而产生的卡阀现象；同时还能避免主阀芯与主阀座之间在启闭时的碰撞。(The invention discloses a safety valve which comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, an outlet pipe communicated with the valve cavity is arranged on the circumferential side surface of the valve body, and an inlet pipe communicated with the valve cavity is arranged at the bottom of the valve body; a main valve seat is arranged in the valve cavity; a valve cover is fixedly arranged at an opening at the upper end of the valve cavity, and is provided with a sleeve extending vertically and downwards; a first spring is sleeved on the sleeve; a main control rod is connected in the sleeve in a sliding mode, the sleeve is provided with a vertical sliding groove, a first spiral groove is formed in the inner side wall, rotatably connected with the sleeve, of the main valve core, and a first protruding column is arranged on the circumferential side face of the main control rod; a second spring is arranged in the sleeve; a pilot valve assembly is arranged in the valve cover; the safety valve is simple in structure, and the valve clamping phenomenon caused by accumulated machining errors of the main valve core is avoided; meanwhile, the collision between the main valve core and the main valve seat during opening and closing can be avoided.)

1. A safety valve is characterized by comprising a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, an outlet pipe communicated with the valve cavity is arranged on the circumferential side surface of the valve body, and an inlet pipe communicated with the valve cavity is arranged at the bottom of the valve body; a main valve seat for separating the inlet pipe and the outlet pipe is arranged in the valve cavity; a valve cover is fixedly arranged at an opening at the upper end of the valve cavity, and a sleeve extending vertically and downwards is arranged on the surface of the valve cover facing the inlet pipe; the main valve seat is provided with a first valve hole for communicating the inlet pipe and the outlet pipe, the sleeve is rotatably connected with a main valve core, and the main valve core is provided with a second valve hole; the sleeve is sleeved with a first spring, and the first spring is positioned between the valve cover and the main valve core and used for forcing the main valve core to be tightly pressed on the main valve seat; a main control rod with the lower end penetrating through the main valve seat is connected in the sleeve in a sliding mode, a vertical sliding groove is formed in the circumferential side face, rotatably connected with the main valve core, of the sleeve, a first spiral groove is formed in the inner side wall, rotatably connected with the sleeve, of the main valve core, and a first protruding column which penetrates through the vertical sliding groove and extends into the first spiral groove is formed in the circumferential side face of the main control rod; a second spring for forcing the main control rod to move downwards is arranged at the upper end of the main control rod in the sleeve; be equipped with the pilot valve subassembly in the valve gap, when the pressure in the inlet pipe is less than the pressure of predetermineeing of pilot valve subassembly, first projection is located the lower extreme of vertical spout, and just first valve opening staggers completely with the second valve opening, when the pressure in the inlet pipe is greater than the pressure of predetermineeing of pilot valve subassembly, vertical spout upward movement is followed to first projection to rotate through the cooperation drive main valve element with first helicla flute, make first valve opening and second valve opening intersect and to overlap completely.

2. The safety valve according to claim 1, characterized in that the pilot valve core assembly comprises a pilot control rod, a third spring, a pilot valve core and a cover body, wherein the upper end of the valve cover is provided with a rotating groove, the bottom center position of the rotating groove is provided with a shaft hole, and the pilot control rod is connected in the shaft hole in a sliding mode; the pilot valve core is rotationally connected to the pilot control rod and is positioned in the rotating groove, and the cover body is fixedly arranged on the valve cover and covers the opening at the upper end of the rotating groove to prevent the pilot valve core from separating from the rotating groove; the third spring is positioned in the cover body, and the lower end of the third spring is abutted against the upper end of the pilot control rod and used for forcing the pilot control rod to move downwards; two positioning chutes with opposite positions are arranged on the inner side wall of the cover body along the vertical direction, and two positioning bulges extending into the positioning chutes are arranged on the pilot control rod; a second spiral groove is formed in the inner side wall, rotatably connected with the pilot control valve core, of the pilot control valve rod, and a second convex column extending into the second spiral groove is arranged on the circumferential side face of the pilot control rod;

a main control cavity is formed between the upper end of a main control rod and the upper end of the sleeve in the sleeve, a pilot control cavity is formed between the lower end of the pilot control rod and the lower end of the shaft hole in the shaft hole, a first through hole for communicating the inlet pipe with the pilot control cavity and a second through hole communicated with the outlet pipe are formed in the valve body and the valve cover, and a third through hole for communicating the rotating groove with the first through hole and a fourth through hole for communicating the rotating groove with the second through hole are formed in the valve cover; a fifth through-flow hole for communicating the main control cavity with the rotating groove is formed in the valve cover; the pilot valve core is provided with an arc-shaped communicating groove on the surface facing the bottom of the rotating groove; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is smaller than the pre-tightening force of the third spring, the arc-shaped communication groove communicates the third through-flow hole with the fifth through-flow hole; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is larger than the pretightening force of the third spring, the arc-shaped communication groove communicates the fourth through-flow hole with the fifth through-flow hole.

3. The safety valve according to claim 2, wherein the pilot lever is provided at an upper end thereof with a positioning plate, the positioning projection is provided on a circumferential side surface of the positioning plate, and a lower end of the third spring abuts against the positioning plate.

4. The safety valve according to claim 3, wherein a positioning column extending vertically upwards is arranged at the center of the positioning disc, and the lower end of the third spring is sleeved on the positioning column.

5. The safety valve of claim 3, wherein a bolt is rotatably coupled to the cover, a lower end of the bolt extends into the cover, and an upper end of the third spring abuts against the lower end of the bolt through the first spring washer.

6. The safety valve of claim 1, wherein the upper end of the first spring is provided with a second spring pad sleeved on the sleeve.

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a safety valve.

Background

The pilot operated safety valve is mainly used in the fields of petroleum, chemical industry, electric power, metallurgy and the like, and is an optimal overpressure protection device on pressurized equipment, containers or pipelines. In practical application, machining errors can be generated due to machining of the valve body and the guide sleeve, and during assembly, due to accumulated errors, the concentricity of the main valve core and the main valve seat can be deviated sometimes, so that the main valve is insensitive to movement, and the safety valve cannot be opened under rated pressure. Impurities can be attached to the sealing surface of the main valve core when the main valve core is opened, the sealing of the main valve core is poor when the main valve core is closed, and the sealing surface and the valve seat of the main valve core can be damaged; the traditional valve core collides with the sealing surface of the valve seat when being opened and closed, so that the valve core and the sealing surface of the valve seat are damaged, and the service life is influenced; when the traditional pilot operated safety valve works, the main valve is rapidly opened and closed, so that great pressure impact can be caused, great burden can be brought to the system by the pressure impact, and the service life of the system is shortened; the pilot valve used by the existing safety valve is generally in a seat valve form, and can collide when the pilot valve core and the pilot valve seat are closed, so that a sealing surface between the pilot valve core and the pilot valve seat is damaged, the pilot valve is opened in advance when the set pressure is not reached, and the safety valve cannot work normally.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a safety valve which is simple in structure and avoids the valve clamping phenomenon of a main valve core due to accumulated machining errors; meanwhile, the collision between the main valve core and the main valve seat during opening and closing can be avoided.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a safety valve comprises a valve body, wherein a valve cavity with an opening at the upper end is arranged in the valve body, an outlet pipe communicated with the valve cavity is arranged on the circumferential side surface of the valve body, and an inlet pipe communicated with the valve cavity is arranged at the bottom of the valve body; a main valve seat for separating the inlet pipe and the outlet pipe is arranged in the valve cavity; a valve cover is fixedly arranged at an opening at the upper end of the valve cavity, and a sleeve extending vertically and downwards is arranged on the surface of the valve cover facing the inlet pipe; the main valve seat is provided with a first valve hole for communicating the inlet pipe and the outlet pipe, the sleeve is rotatably connected with a main valve core, and the main valve core is provided with a second valve hole; the sleeve is sleeved with a first spring, and the first spring is positioned between the valve cover and the main valve core and used for forcing the main valve core to be tightly pressed on the main valve seat; a main control rod with the lower end penetrating through the main valve seat is connected in the sleeve in a sliding mode, a vertical sliding groove is formed in the circumferential side face, rotatably connected with the main valve core, of the sleeve, a first spiral groove is formed in the inner side wall, rotatably connected with the sleeve, of the main valve core, and a first protruding column which penetrates through the vertical sliding groove and extends into the first spiral groove is formed in the circumferential side face of the main control rod; a second spring for forcing the main control rod to move downwards is arranged at the upper end of the main control rod in the sleeve; be equipped with the pilot valve subassembly in the valve gap, when the pressure in the inlet pipe is less than the pressure of predetermineeing of pilot valve subassembly, first projection is located the lower extreme of vertical spout, and just first valve opening staggers completely with the second valve opening, when the pressure in the inlet pipe is greater than the pressure of predetermineeing of pilot valve subassembly, vertical spout upward movement is followed to first projection to rotate through the cooperation drive main valve element with first helicla flute, make first valve opening and second valve opening intersect and to overlap completely.

In a further technical scheme, the pilot valve core assembly comprises a pilot control rod, a third spring, a pilot valve core and a cover body, wherein a rotating groove is formed in the upper end of the valve cover, a shaft hole is formed in the center of the bottom of the rotating groove, and the pilot control rod is connected in the shaft hole in a sliding mode; the pilot valve core is rotationally connected to the pilot control rod and is positioned in the rotating groove, and the cover body is fixedly arranged on the valve cover and covers the opening at the upper end of the rotating groove to prevent the pilot valve core from separating from the rotating groove; the third spring is positioned in the cover body, and the lower end of the third spring is abutted against the upper end of the pilot control rod and used for forcing the pilot control rod to move downwards; two positioning chutes with opposite positions are arranged on the inner side wall of the cover body along the vertical direction, and two positioning bulges extending into the positioning chutes are arranged on the pilot control rod; a second spiral groove is formed in the inner side wall, rotatably connected with the pilot control valve core, of the pilot control valve rod, and a second convex column extending into the second spiral groove is arranged on the circumferential side face of the pilot control rod;

a main control cavity is formed between the upper end of a main control rod and the upper end of the sleeve in the sleeve, a pilot control cavity is formed between the lower end of the pilot control rod and the lower end of the shaft hole in the shaft hole, a first through hole for communicating the inlet pipe with the pilot control cavity and a second through hole communicated with the outlet pipe are formed in the valve body and the valve cover, and a third through hole for communicating the rotating groove with the first through hole and a fourth through hole for communicating the rotating groove with the second through hole are formed in the valve cover; a fifth through-flow hole for communicating the main control cavity with the rotating groove is formed in the valve cover; the pilot valve core is provided with an arc-shaped communicating groove on the surface facing the bottom of the rotating groove; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is smaller than the pre-tightening force of the third spring, the arc-shaped communication groove communicates the third through-flow hole with the fifth through-flow hole; when the pressure of the medium in the inlet pipe acting on the lower end of the pilot control rod is larger than the pretightening force of the third spring, the arc-shaped communication groove communicates the fourth through-flow hole with the fifth through-flow hole.

In a further technical scheme, the upper end of guide's control lever is equipped with the positioning disk, the setting of location arch is on the circumference side of positioning disk, the lower extreme of third spring is contradicted on the positioning disk.

In a further technical scheme, a positioning column extending vertically and upwards is arranged at the center of the positioning disc, and the lower end of the third spring is sleeved on the positioning column.

In a further technical scheme, the cover body is rotatably connected with a bolt, the lower end of the bolt extends into the cover body, and the upper end of the third spring is abutted against the lower end of the bolt through the first spring pad.

In a further technical scheme, a second spring cushion sleeved on the sleeve is arranged at the upper end of the first spring.

(III) advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the main valve core is controlled to rotate by using the main control rod, so that the first valve hole is opened and closed, and the valve clamping phenomenon caused by accumulated machining errors of the main valve core is avoided; meanwhile, the collision between the main valve core and the valve seat during opening and closing is avoided, the sealing surface of the valve seat is protected, and the service life is longer;

(2) the mode that the main valve core is controlled to rotate by the main control rod so as to open and close the first valve hole is adopted, so that the first valve hole is not opened rapidly as a traditional pilot safety valve when opened and closed, but the opening area is opened slowly from small to large, and the system pressure impact can be reduced;

(3) the mode of opening and close first valve opening is rotatory through main valve core for first valve opening when opening, adnexed impurity on the sealed face can be scraped along with sealed rotation of face when main valve core closes, can not pressed the damage that causes sealed face between sealed face, long service life.

(4) The pilot valve component adopts a mode of rotating the pilot valve core, so that the pilot valve core cannot collide when being opened and closed, and the service life is prolonged; and meanwhile, impurities attached to the pilot valve core can be hung along with the rotation of the sealing surface when the pilot valve core is closed, so that the sealing surface cannot be damaged, and the service life is longer.

Drawings

FIG. 1 is a front view of the present invention

FIG. 2 is a left side view of the present invention

FIG. 3 is a top view of the present invention

FIG. 4 is a block diagram of the present invention

FIG. 5 is a cross-sectional view taken in the direction A-A of FIG. 2 with the safety valve closed;

FIG. 6 is a cross-sectional view taken in the direction B-B of FIG. 2 with the safety valve closed;

FIG. 7 is a cross-sectional view taken in the direction A-A of FIG. 2 with the relief valve open;

FIG. 8 is a cross-sectional view in the direction B-B of FIG. 2 with the relief valve open;

FIG. 9 is a cross-sectional view in the direction C-C of FIG. 1 with the safety valve closed;

FIG. 10 is a block diagram of a main poppet of the present invention;

FIG. 11 is a first construction of the pilot valve cartridge of the present invention;

FIG. 12 is a second construction view of the pilot valve cartridge of the present invention;

FIG. 13 is a perspective view of a second helical groove in the pilot operated valve spool according to the present invention;

FIG. 14 is a block diagram of the pilot control lever of the present invention;

fig. 15 is a structural view of the cover of the present invention.

Detailed Description

Referring to fig. 1-15, a safety valve includes a valve body 1, a valve cavity 101 with an open upper end is provided in the valve body 1, an outlet pipe 102 communicated with the valve cavity 101 is provided on a circumferential side surface of the valve body 1, and an inlet pipe 103 communicated with the valve cavity 101 is provided at a bottom of the valve body 1; a main valve seat 104 for separating an inlet pipe 103 and an outlet pipe 102 is arranged in the valve cavity 101; a valve cover 6 is fixedly installed at an opening at the upper end of the valve cavity 101, and a sleeve 601 which vertically extends downwards is arranged on the surface of the valve cover 6 facing the inlet pipe 103; a first valve hole 1c for communicating the inlet pipe 103 with the outlet pipe 102 is formed in the main valve seat 104, a main valve element 2 is rotatably connected to the sleeve 601, and a second valve hole 2b is formed in the main valve element 2; a first spring 5 is sleeved on the sleeve 601, the first spring 5 is positioned between the bonnet 6 and the main valve element 2 and used for forcing the main valve element 2 to be pressed on the main valve seat 104, a second spring pad 51 sleeved on the sleeve 601 is arranged at the upper end of the first spring 5, and the second spring pad 51 is arranged to reduce the friction force between the upper end of the first spring 5 and the bonnet 6; a main control rod 3 with the lower end penetrating through the main valve seat 104 is connected in the sleeve 601 in a sliding manner, a vertical sliding groove 6k is formed in the circumferential side surface of the sleeve 601, which is rotatably connected with the main valve core 2, a first spiral groove 2a is formed in the inner side wall of the main valve core 2, which is rotatably connected with the sleeve 601, and a first convex column 3a penetrating through the vertical sliding groove 6k and extending into the first spiral groove 2a is formed in the circumferential side surface of the main control rod 3; a second spring 4 for forcing the main control rod 3 to move downwards is arranged at the upper end of the main control rod 3 in the sleeve 601; the valve cover 6 is internally provided with a pilot valve assembly, when the pressure in the inlet pipe 103 is smaller than the preset pressure of the pilot valve assembly, the first convex column 3a is positioned at the lower end of the vertical sliding groove 6k, the first valve hole 1c and the second valve hole 2b are completely staggered, when the pressure in the inlet pipe 103 is larger than the preset pressure of the pilot valve assembly, the first convex column 3a moves upwards along the vertical sliding groove 6k and drives the main valve core 2 to rotate through the matching with the first spiral groove 2a, and therefore the first valve hole 1c and the second valve hole 2b are intersected until being completely overlapped.

In a further technical scheme, the pilot valve core assembly comprises a pilot control rod 7, a third spring 10, a pilot valve core 8 and a cover body 9, a rotating groove 61 is arranged at the upper end of the valve cover 6, a shaft hole 62 is arranged at the center of the bottom of the rotating groove 61, and the pilot control rod 7 is connected in the shaft hole 62 in a sliding manner; the pilot valve core 8 is rotatably connected to the pilot control rod 7 and is positioned in the rotating groove 61, and the cover body 9 is fixedly installed on the valve cover 6 and covers an opening at the upper end of the rotating groove 61 to prevent the pilot valve core 8 from being separated from the rotating groove 61; the third spring 10 is positioned in the cover body 9, and the lower end of the third spring is abutted against the upper end of the pilot control rod 7 to force the pilot control rod 7 to move downwards; two positioning chutes 9a with opposite positions are arranged on the inner side wall of the cover body 9 along the vertical direction, a positioning disc 71 is arranged at the upper end of the pilot control rod 7, two positioning protrusions 7b extending into the positioning chutes 9a are arranged on the circumferential side surface of the positioning disc 71, and the lower end of the third spring 10 abuts against the positioning disc 71; a second spiral groove 8a is formed in the inner side wall of the pilot valve core 8, which is rotatably connected with the pilot control rod 7, and a second convex column 7a extending into the second spiral groove 8a is arranged on the circumferential side surface of the pilot control rod 7. In order to prevent the lower end of the third spring 10 from sliding, a positioning column 72 extending vertically upwards is arranged at the central position of the positioning disc 71, and the lower end of the third spring 10 is sleeved on the positioning column 72.

A main control chamber 6h is formed between the upper end of the main control lever 3 and the upper end of the sleeve 601 in the sleeve 601, a pilot control chamber 6g is formed between the lower end of the pilot control lever 7 and the lower end of the shaft hole 62 in the shaft hole 62, a first through-flow hole 1a for communicating the inlet pipe 103 and the pilot control chamber 6g and a second through-flow hole 1b communicated with the outlet pipe 102 are formed in the valve body 1 and the valve cover 6, and a third through-flow hole 6e for communicating the rotary groove 61 and the first through-flow hole 1a and a fourth through-flow hole 6f for communicating the rotary groove 61 and the second through-flow hole 1b are formed in the valve cover 6; a fifth through hole 6j for communicating the main control cavity 6h with the rotating groove 61 is further formed in the valve cover 6; the surface of the pilot valve core 8 facing the bottom of the rotating groove 61 is provided with an arc-shaped communicating groove 8 b; when the pressure of the medium in the inlet pipe 103 acting on the lower end of the pilot control rod 7 is smaller than the pre-tightening force of the third spring 10, the arc-shaped communication groove 8b communicates the third through-flow hole 6e with the fifth through-flow hole 6 j; when the pressure of the medium in the inlet pipe 103 acting on the lower end of the pilot control lever 7 is greater than the biasing force of the third spring 10, the arc-shaped communication groove 8b communicates the fourth through-hole 6f with the fifth through-hole 6 j.

In addition, a bolt 77 is rotatably connected to the cover 9, the lower end of the bolt 77 extends into the cover 9, and the upper end of the third spring 10 abuts against the lower end of the bolt 77 through a first spring pad 78; the setting of the screw 77 enables the adjustment of the pretension of the third spring 10.

When the safety valve works, a medium enters the valve cavity 101 from the inlet pipe 103, and when the system pressure does not exceed the set pressure of the pilot valve assembly, the medium enters the main control cavity 6h through the inlet pipe 103, the first through-flow hole 1a, the third through-flow hole 6e, the arc-shaped communication groove 8b and the fifth through-flow hole 6j (shown in FIG. 6); at this time, the upper end and the lower end of the main control rod 3 are acted by the medium equally, the main control rod 3 is kept still under the action of the second spring 4, so that the main valve core 2 is also kept still (as shown in fig. 5), the first valve hole 1c and the second valve hole 2b are completely staggered, and the inlet pipe 103 is not communicated with the outlet pipe 102; when the pressure of the system medium rises and exceeds the pressure set by the pilot valve assembly, the medium enters the pilot control chamber 6g through the inlet pipe 103 and the first through-flow hole 1a and overcomes the force of the third spring 10 acting on the pilot control rod 7 to push the pilot control rod 7 to move upwards, due to the matching of the positioning protrusion 7b on the pilot control rod 7 and the positioning chute 9a and the matching relationship of the second convex column 7a and the second spiral groove 8a, the pilot control rod 7 moves upwards to drive the pilot valve spool 8 to rotate around the pilot control rod 7, when the pilot control rod 7 moves upwards to the position shown in fig. 7, the thrust of the system medium acting on the lower end of the pilot control rod 7 is balanced with the pre-tightening force of the third spring 10, at the moment, the state of the pilot valve spool 8 is shown in fig. 7 and 8, the medium in the main control chamber 6h passes through the fifth through-flow hole 6j, the arc-shaped communication groove 8b, and the medium, The fourth through-flow hole 6f and the second through-flow hole 1b are discharged from the outlet pipe 102, the medium thrust borne by the lower portion of the main control rod 3 is large at the moment, and the medium thrust borne by the lower portion of the main control rod is pushed upwards, due to the matching of the first convex column 3a and the vertical sliding groove 6k and the matching of the first convex column 3a and the first spiral groove 2a, the main control rod 3 drives the main valve element 2 to rotate while moving upwards, the first valve hole 1c and the second valve hole 2b are driven to intersect until completely coinciding, at the moment, the medium passes through the inlet pipe 103, the first valve hole 1c, the second valve hole 2b, and the outlet pipe 102 flows through the safety valve. After the system medium pressure is reduced, the pilot control rod 7 falls back under the action of the third spring 10, the pilot valve core 8 rotates back to the state shown in fig. 5 and 6, after the system medium pressure is reduced, the main control rod 3 falls back under the action of the second spring 4, the main valve core 2 rotates back, if impurities remain on the sealing surface at the moment, the main valve core 2 and the pilot valve core 8 hang the impurities on the sealing surface in the process of rotating back the main valve core 2 and the pilot valve core 8, the sealing surface is protected, and the service life is prolonged; because main valve element 2 rotates and opens first valve opening 1c and second valve opening 2b, then the switching of first valve opening 1c and second valve opening 2b is more gentle, can not produce pressure impact, has promoted system life.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.