阅读说明：本技术 结晶专用换向阀 (Crystallize Special change-over valve ) 是由 项光忠 于 2019-08-27 设计创作，主要内容包括：本发明公开了结晶专用换向阀,包括阀体,所述阀体且位于两端的输送管道连接法兰之间的阀体外侧均设置有伴热夹套,所述伴热夹套的底部对称设置有伴热接管,所述阀体的内部设置有阀座,所述阀座内侧设置有阀芯,所述阀体的上部设置有压套,所述压套与阀座导通,所述压套的底端与阀座之间设置有填料层,所述压套的顶端通过压板与阀杆连接固定,所述阀杆的顶端延伸至气动执行器或电动执行器的内部。本发明中,通过在阀体的外侧设置伴热夹套,并通过伴热接管循环输送伴热介质至阀体和伴热夹套之间,从而使得内腔中的介质始终处于稳定的温度,即便处于关闭状态阀芯的进口侧的介质不流动,也难以具备结晶的条件,从而减少结晶的产生。(The invention discloses crystallization Special change-over valves, including valve body, heat tracing collet is provided on the outside of the valve body and the valve body being located between the conveyance conduit connecting flange at both ends, the bottom symmetrical of the heat tracing collet is provided with heat tracing adapter tube, the valve body is internally provided with valve seat, spool is provided on the inside of the valve seat, the top of the valve body is provided with pressing sleeve, the pressing sleeve is connected with valve seat, packing layer is provided between the bottom end and valve seat of the pressing sleeve, the top of the pressing sleeve is connected and fixed by pressing plate and valve rod, the top of the valve rod extends to the inside of pneumatic actuator or Electric Actuator.In the present invention, by the way that heat tracing collet is arranged in the outside of valve body, and by heat tracing adapter tube circulation conveying heat tracing medium between valve body and heat tracing collet, so that the medium in inner cavity is in stable temperature always, it is not flowed even in the medium of the inlet side of closed state spool, also it is difficult to the condition for having crystallization, to reduce the generation of crystallization.)

1. crystallizing Special change-over valve, including valve body (1), which is characterized in that the valve body (1) and the conveyance conduit company for being located at both ends It is provided with heat tracing collet (3) on the outside of valve body (1) between acting flange (2), the bottom symmetrical of the heat tracing collet (3) is provided with Heat tracing takes over (4), and the valve body (1) is internally provided with valve seat (5), is provided with spool (6) on the inside of the valve seat (5), described The top of valve body (1) is provided with pressing sleeve (7), and the pressing sleeve (7) and valve seat (5) are connected, the bottom end of the pressing sleeve (7) and valve seat (5) it is provided between packing layer (8), the top of the pressing sleeve (7) is connected and fixed by pressing plate (9) with valve rod (10), the valve The top of bar (10) extends to the inside of pneumatic actuator (11), is provided with valve position switch at the top of the pneumatic actuator (11) (12), it is provided with solenoid valve (13) and filtering pressure reducing valve (14) on the outside of the pneumatic actuator (11), the one of the valve body (1) Side is provided with scavenging conduit (15).

2. crystallization Special change-over valve according to claim 1, which is characterized in that the valve body (1) and valve seat (5) pass through platform Terrace cooperation, and the first dust-proof seal ring (16) are provided between valve body (1) and the mating surface of valve seat (5), the valve seat (5) It is provided with placing groove (17) on cooperation step surface, the inside of the placing groove (17) is placed with counterbalance spring (18).

3. crystallization Special change-over valve according to claim 1, which is characterized in that set between the valve seat (5) and spool (6) It is equipped with and is welded on valve seat (5) with the scraper (19) of spool (6) surface engagement, the scraper (19).

4. crystallization Special change-over valve according to claim 1, which is characterized in that the one end of the valve rod (10) is provided with Blowout prevention structure (20), the blowout prevention structure (20) and pressing sleeve (7) and valve body (1) cooperate, the end face of the valve rod (10) and valve body (1) the second dust-proof seal ring (21) are provided between.

5. crystallization Special change-over valve according to claim 1, which is characterized in that set between the spool (6) and valve body (1) It is equipped with middle chamber (22), and the inside of valve body (1) is connected to scavenging conduit (15), is provided with manual ball on the scavenging conduit (15) Valve.

Technical field

The present invention relates to reversal valve technical fields, more particularly to crystallization Special change-over valve.

Background technique

In the industrial production, valve using more and more extensive, and the form of valve group is mostly used to use.The medium of transmission is logical The import for crossing tee tube and valve enters inner cavity, then leaves from outlet, is provided with spool in the lumen for closing inner chamber, valve Door changes the flow direction of medium by the open state of spool.

Due to using two valves, not only higher cost, but also stability is poor, therefore produces reversal valve, but changes To valve when transmitting some special media (such as: melamine), medium easily crystallizes under static and low-temperature condition, therefore uses Reversal valve can encounter such problems to control when such medium flows to:

1, the medium for being in close state the inlet side of spool does not flow, and temperature is lower, dead zone easy to form, crystallizes to medium It creates condition；

2, it can be set in spool face after medium crystallization, seriously affects the smooth opening and closing and leakproofness of spool, leads to the reversal valve Replacement can only be scrapped, production is stopped work, and huge economic loss is caused.

Summary of the invention

It is an object of the invention to: it is not flowed to solve the medium for the inlet side for being in close state spool, and temperature It can be set in spool face after lower easy crystallization and medium crystallization, the smooth opening and closing and leakproofness of spool is seriously affected, lead The problem of causing the reversal valve that can only scrap replacement, producing and stop work, cause huge economic loss, and the dedicated commutation of crystallization proposed Valve.

To achieve the goals above, present invention employs following technical solutions:

Outside crystallization Special change-over valve, including valve body, the valve body and the valve body being located between the conveyance conduit connecting flange at both ends Side is provided with heat tracing collet, and the bottom symmetrical of the heat tracing collet is provided with heat tracing adapter tube, and the valve body is internally provided with Valve seat, the valve seat inside are provided with spool, and the top of the valve body is provided with pressing sleeve, and the pressing sleeve is connected with valve seat, described Packing layer is provided between the bottom end and valve seat of pressing sleeve, the top of the pressing sleeve is connected and fixed by pressing plate and valve rod, the valve The top of bar extends to the inside of pneumatic actuator, and valve position switch is provided at the top of the pneumatic actuator, described pneumatically to hold Solenoid valve and filtering pressure reducing valve are provided on the outside of row device, the side of the valve body is provided with scavenging conduit.

It is as above-mentioned technical proposal to further describe:

The valve body and valve seat are cooperated by step surface, and the first dust seal is provided between valve body and the mating surface of valve seat It encloses, is provided with placing groove on the cooperation step surface of the valve seat, the inside of the placing groove is placed with counterbalance spring.

It is as above-mentioned technical proposal to further describe:

The scraper with spool face cooperation is provided between the valve seat and spool, the scraper is welded on valve seat.

It is as above-mentioned technical proposal to further describe:

The one end of the valve rod is provided with blowout prevention structure, the blowout prevention structure and pressing sleeve and valve body cooperates, the end of the valve rod The second dust-proof seal ring is provided between face and valve body.

It is as above-mentioned technical proposal to further describe:

It is provided with middle chamber between the spool and valve body, and the inside of valve body is connected to scavenging conduit, is set on the scavenging conduit It is equipped with manual ball valve.

In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:

1, in the present invention, by the way that heat tracing collet is arranged in the outside of valve body, and extremely by heat tracing adapter tube circulation conveying heat tracing medium Between valve body and heat tracing collet, so that the medium in inner cavity is in higher temperature always, even in closed state valve The medium of the inlet side of core does not flow, it is also difficult to have the condition of crystallization, to reduce the generation of crystallization.

2, in the present invention, the scraper that setting prevents crystallization from accumulating on the sealing surface of valve seat, if any Binding in spool Spherical surface on, during valve core rotation, the edge of a knife of scraper will root out the crystalline solid of spherical surface, thus guarantee spool spherical surface begin Cleaning is kept eventually, and guarantee valve sealing face is not scratched and higher leakproofness.

3, in the present invention, due in equipment running process, crystalline solid can be in each position of body cavity, to avoid and Reducing, hydrops stuck on valve seat construction design compensation position and crystallization etc. influences the sensitivity of valve seat, therefore in valve body and valve seat The first dust seal loop mechanism of place's design, can effectively prevent medium from entering the gap between valve body and valve seat, and protection sealing is mended Repaying property does not fail persistently.

4, in the present invention, pressure medium can generate outside thrust to valve rod under operating conditions, to prevent valve rod from spraying, Stem design blowout prevention structure, while valve rod is installed from inside to outside effectively prevent valve rod to spray and reduce connecing for valve rod and spool Contacting surface product guarantees that valve rod and spool contact surface are always consistent, effectively avoids ejection and valve rod and the spool of valve rod Steady contact.

5, in the present invention, the second dust-proof seal ring of the setting of valve stem end effectively prevent material to penetrate into packing layer, keeps away Exempt from product and generate influence of the crystal to valve stability, and the second dust-proof seal ring is most nearby set in valve rod and from valve inner wall, Prevent material and enter valve body and valve lever clearance, avoid the influence to operation torque, preventing valve, torque increases in use And valve event is insensitive.

6, in the present invention, blow valve port is arranged in valve lumen, and is connected to by scavenging conduit and manual ball valve with external, when encountering It uses or shuts down for a long time and use too long, if valve cavity generation crystal cannot exclude, steam soaking valve can be passed through The cleaning of door inner cavity and sealing surface removes the puzzlement of valve cleaning to be dismantled from and because of material waste caused by dismantling.

7, in the present invention, since medium has the particularity of crystallization, valve chamber is made to increase valve body and spool compounding practice Spatial design makes spool reduce influence of the crystalline solid to spool as far as possible in bigger middle chamber.

Detailed description of the invention

Fig. 1 shows the front view of the crystallization Special change-over valve provided according to embodiments of the present invention；

Fig. 2 shows the partial sectional views at A-A in Fig. 1；

Fig. 3 shows the partial enlarged view in Fig. 2 at B；

Fig. 4 shows the partial enlarged view in Fig. 2 at C；

Fig. 5 shows the partial enlarged view in Fig. 2 at D；

Fig. 6 shows the schematic diagram of the middle chamber provided according to embodiments of the present invention；

Fig. 7 shows access schematic diagram when the crystallization Special change-over valve provided according to embodiments of the present invention is normal to obtain electricity condition；

Access schematic diagram when Fig. 8 shows the crystallization Special change-over valve failure provided according to embodiments of the present invention or power failure state.

Marginal data:

1, valve body；2, conveyance conduit connecting flange；3, heat tracing collet；4, heat tracing is taken over；5, valve seat；6, spool；7, pressing sleeve；8, it fills out The bed of material；9, pressing plate；10, valve rod；11, pneumatic actuator；12, valve position switch；13, solenoid valve；14, filtering pressure reducing valve；15, it purges Pipe；16, the first dust-proof seal ring；17, placing groove；18, counterbalance spring；19, scraper；20, blowout prevention structure；21, second is dust-proof close Seal；22, middle chamber.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other Embodiment shall fall within the protection scope of the present invention.

Fig. 1-8 is please referred to, the present invention provides a kind of technical solution: crystallization Special change-over valve, including valve body 1, valve body 1 and position Heat tracing collet 3, the bottom symmetrical of heat tracing collet 3 are provided on the outside of valve body 1 between the conveyance conduit connecting flange 2 at both ends It is provided with heat tracing adapter tube 4, valve body 1 is internally provided with valve seat 5, spool 6 is provided on the inside of valve seat 5, and the top of valve body 1 is provided with Pressing sleeve 7, pressing sleeve 7 and valve seat 5 are connected, and are provided with packing layer 8 between the bottom end and valve seat 5 of pressing sleeve 7, the top of pressing sleeve 7 passes through pressure Plate 9 is connected and fixed with valve rod 10, and the top of valve rod 10 extends to the inside of pneumatic actuator 11, and the top of pneumatic actuator 11 is set It is equipped with valve position switch 12, the outside of pneumatic actuator 11 is provided with solenoid valve 13 and filtering pressure reducing valve 14, the side setting of valve body 1 There is scavenging conduit 15.

By the way that heat tracing collet 3 is arranged in the outside of valve body 1, and pass through 4 circulation conveying heat tracing medium of heat tracing adapter tube to valve body 1 Between heat tracing collet 3, so that the medium in inner cavity is in higher temperature always, even in closed state spool 6 The medium of inlet side do not flow, it is also difficult to have the condition of crystallization, to reduce the generation of crystallization, spool 6 uses spherical junctions Structure can fast implement commutation.

Simultaneously 1 inner cavity of valve body always with media contact, therefore inner cavity use process of refinement, reach mirror surface requirement, make object Material is not easy to adhere to cavity wall, and use for a long time, which can be effectively prevented, to be led to crystal adherency accumulation and influence circulation area.

Specifically, as shown in figure 3, valve body 1 and valve seat 5 are cooperated by step surface, and the mating surface of valve body 1 and valve seat 5 it Between be provided with the first dust-proof seal ring 16, be provided with placing groove 17 on the cooperation step surface of valve seat 5, the inside of placing groove 17 is placed There is counterbalance spring 18, since in equipment running process, crystalline solid can be in each position of 1 inner cavity of valve body, to avoid and reducing , hydrops stuck on 5 structure design compensation position of valve seat and crystallization etc. influence the sensitivity of valve seat 5, therefore in valve body 1 and valve seat 5 Design 16 mechanism of the first dust-proof seal ring, place, can effectively prevent medium from entering the gap between valve body 1 and valve seat 5, protect close It seals and compensatory does not fail persistently.

Specifically, as shown in figure 4, being provided with the scraper 19 with 6 surface engagement of spool, scraper 19 between valve seat 5 and spool 6 It is welded on valve seat 5, to prevent material crystallization to be sticked on the spherical surface of attached spool 6, leading to valve, torque is increased in use With the factors such as poorly sealed, therefore the scraper 19 that setting prevents crystallization from accumulating on the sealing surface of valve seat 5 exists if any Binding On the spherical surface of spool 6, in 6 rotation process of spool, the edge of a knife of scraper 19 will root out the crystalline solid of spherical surface, to guarantee spool 6 spherical surface remains cleaning, and guarantee valve sealing face is not scratched and higher leakproofness.

Specifically, as shown in figure 5, the one end of valve rod 10 is provided with blowout prevention structure 20, blowout prevention structure 20 and pressing sleeve 7 and valve Body 1 cooperates, and is provided with the second dust-proof seal ring 21, under operating conditions pressure medium meeting between the end face and valve body 1 of valve rod 10 Outside thrust is generated to valve rod 10, to prevent valve rod 10 from spraying, valve rod 10 devises blowout prevention structure 20, and valve rod 10 is from inside to outside Installation effectively prevent valve rod 10 to spray and reduce the contact area of valve rod 10 and spool 6, guarantees valve rod 10 and 6 contact surface of spool It is always consistent, effectively avoid the ejection of valve rod 10 and the steady contact of valve rod 10 and spool 6；10 end of valve rod The second dust-proof seal ring 21 being arranged effectively prevent material to penetrate into packing layer 8, and product is avoided to generate crystal to valve stability Influence, and the second dust-proof seal ring 21 is most nearby set in valve rod 10 and from valve inner wall, prevents material and enter valve body 1 and valve rod 10 gaps avoid the influence to operation torque, and preventing valve, torque increases in use and valve event is insensitive.

Specifically, as shown in fig. 6, be provided with middle chamber 22 between spool 6 and valve body 1, and the inside of valve body 1 and purging Pipe 15 is connected to, and is provided with manual ball valve on scavenging conduit 15, and since medium has the particularity of crystallization, valve chamber is made to increase 1 He of valve body 6 compounding practice spatial design of spool makes spool 6 reduce crystalline solid as far as possible to the shadow of spool 6 in bigger middle chamber 22 Ring, valve lumen be arranged blow valve port, when encounter for a long time use or shut down use too long, if valve cavity generate crystal without When method excludes, by the cleaning of steam soaking valve cavity and sealing surface, can remove from the puzzlement of valve to be dismantled cleaning with And because of material waste caused by dismantling.

Working principle:

When normal work, 4 circulation conveying heat tracing medium of heat tracing adapter tube is between valve body 1 and heat tracing collet 3, so that in inner cavity Medium be in higher temperature always.

Valve position switch 12 starts simultaneously, and driving stem 10 acts, until valve rod 10 acts on spool 6, forces spool 6 dynamic Make to complete commutation, realizes access as shown in Figure 7.

When valve failure or power loss, valve position switch 12 can not act, then pneumatic actuator 11 starts, driving stem 10 Movement forces the movement of spool 6 to complete commutation, realizes access as shown in Figure 8 until valve rod 10 acts on spool 6.

When valve is not used for a long time, by scavenging conduit 15 and manual ball valve by high-temperature steam, valve cavity is cleaned And the crystallization of sealing surface.

The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.