CN2361914Y - Water return self-controlling valve for atmospheric boiler - Google Patents

Abstract

The utility model relates to a water return self-controlling valve for atmospheric boiler which comprises a valve body 10, an upper cap 50, a bottom cap 60, a valve rod 30 and a valve core 20. The lower part of the valve body is provided with a piston barrel 13, the middle part is provided with a valve hole 15, the end part of the valve hole is provided with a slope stopping opening 16, the upper part of the valve rod is arranged in a guide sleeve 51 of the upper cap, and the lower end is connected with a piston 40. The upper part of the valve rod is provided with the valve core 20, the edge of the valve plate of the valve core is provided with a flange 27 which is corresponding to the slot stopping opening 16 of the end part of the valve hole, a pressing plate 23 of the valve core and a U-shaped leather cup 22 can be arranged in the valve hole 15 together. The center of the bottom cap is provided with a water inlet 61, a water discharging valve 70 is arranged in the bore, and the utility model has the advantages of simple structure, low cost, which can effectively prevent the water hammer phenomena.

Description

Normal-pressure boiler backwater internally piloted valve

The utility model relates to the backwater control valve in a kind of atmospheric hot-water heating system.

The operation characteristic of normal-pressure boiler is that furnace roof communicates with atmosphere, and spill pipe is arranged, when normal operation, and because of the circulating water pump stability of flow, boiler turnover water balance, thereby water liquid level stabilizing in the stove.When termination of pumping or accidental shutdown, need close backwater valve immediately, otherwise the water in the system can be constantly leaks into boiler and overflows from the overflow mouth of pipe from return pipe, cause energy waste, even can scald the staff.Thereby various backwater internally piloted valves have appearred, wherein solenoid valve and float valve are because of safeguarding and technical reason is eliminated.Advanced at present technological scheme is the hydraulic control switch valve, as CN2081937, CN2166311, CN2163276.Its common feature is to set up control chamber in valve body, utilize piston hydraulic action control valve bore, and spring structure has been adopted in resetting of valve plate (lobe).No matter be the inner spring formula or the internally piloted valve of outer spring formula, all there be structure more complicated, manufacture cost height, can not effectively avoid the shortcoming of backwater water hammer, the deficiency that also has the spring easy-to-rust, easily twined for inner spring formula control valve by foreign material.

The purpose of this utility model is to overcome the shortcoming of prior art, provide a kind of simple in structure, cost is lower, can effectively prevent the normal-pressure boiler backwater internally piloted valve that water hammer takes place.

The utility model is achieved through the following technical solutions its purpose.A kind of normal-pressure boiler backwater internally piloted valve, comprise: the horizontally disposed valve body of intake-outlet, be positioned at the valve opening at valve body middle part, the valve rod that is connected with valve body, be installed in the spool on valve rod top, be positioned at the piston cylinder of valve body lower portion, piston, and loam cake, lower cover, described valve opening end face has the inclined-plane seam, described spool comprises: suit and be positioned at fixed plate on the valve rod boss successively, the U-shaped leather cup, pressing plate, sealing plate, valve plate, fastening with nut, there is the flange with the corresponding contact of valve opening end chamfer seam at its valve plate edge, and pressing plate can enter in the valve opening together with the U-shaped leather cup, the upper end of described valve rod is installed in the guide pin bushing of loam cake, and the lower end of valve rod connects piston.

Described piston comprises: suit and be positioned at punch holder, U-shaped leather cup, middle clamp plate, inversion U-shaped leather cup, die holder on the valve rod boss successively, and fastening with the spiral shell inspection.Described lower cover and piston cylinder are with being threaded, and there is the water-aspirator pressure water inlet at the middle part of lower cover, and drain valve is housed in the hole.Described drain valve is made up of valve seat, hollow valve head, nut, and its valve seat is threaded in the water intake, and the hollow valve head is threaded with valve seat, and fastening with nut.The outer surface of hollow valve head has the groove of vertical perforation.Described loam cake is threaded with valve body, and the center of loam cake has valve rod to regulate the jackscrew of location.

Advantage of the present utility model:

1, simple in structure.Because piston cylinder and valve body are taked overall structure, valve rod double as piston rod, upper and lower covers adopts screw-thread fit with being connected of valve body, has therefore simplified device greatly, makes internally piloted valve compact to design, simple in structure, has reduced manufacture cost.

2, sealing is reliable.Spool is taked the secondary seal structure, be that pressing plate is a primary seal together with better seal is arranged between U-shaped leather cup and the cylindrical shape valve opening, the flange of valve plate has formed the cutter type together with sealing plate with the inclined-plane seam of valve opening end and has been sealed into secondary seal, the sealing of cutter type not only has excellent sealing performance, and has the positioning action that stops spool to glide.The X-shaped sealing configuration that piston has taked opposite U-shaped leather cup of both direction and clamping plate to form, down cup spreading water shutoff during work, last leather cup plays the effect of anti-silt obstruction.

3, effectively prevented water hammer.Owing to the secondary seal that is sealed into of spool and valve opening, between the two-stage sealing segment distance is arranged.When termination of pumping, piston glides, make the pressing plate of spool enter the cylindrical shape valve opening together with the U-shaped leather cup, first order sealing is worked, current are sealed, and the hydraulic pressure in the return water system raises, and spool continues to glide under the impact of current simultaneously, when the valve plate flange with after the valve opening seam contacts, cutter type sealing in the second level is worked and is forced spool to stop gliding.Like this, in this moment, return water system pressure on the one hand will raise, because spool continues to glide volume is increased to some extent on the other hand, so water hammer just is difficult to take place.Reasonably design makes internally piloted valve prevent the water hammer of return water system after the termination of pumping effectively.

4, open sensitive, close steadily.Owing to covering the drain valve that with groove is housed down, and can adjust the position regulation bleeder quantity up and down, thereby control piston drives the rate of descent of spool, produce the buffering damping function when making it to close, reasonably design piston area in addition, therefore, internally piloted valve has the sensitivity of unlatching rapidly, closes the characteristics of buffering damping.

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Fig. 1 is a kind of structural representation of normal-pressure boiler backwater internally piloted valve.

Fig. 2 is the structural representation of piston cylinder drain valve.

Fig. 3 is the A-A sectional view of Fig. 2.

As shown in Figure 1, a kind of normal-pressure boiler backwater internally piloted valve comprises: intake- outlet 11,12 horizontally disposed valve bodies 10, loam cake 50, lower cover 60, be positioned at valve body middle part valve rod 30, be installed in the spool 20 on the valve rod.Piston cylinder 13 is arranged at the bottom of its valve body 10, and iron chains have lining 14, and there is valve opening 15 at the middle part of valve body 10.The upper end of its valve rod 30 is installed in the guide pin bushing 51 of loam cake 50, and the lower end connects piston 40, and spool 20 is equipped with on the top of valve rod.Its spool 20 comprises: suit and be positioned at fixed plate 21 on the valve rod boss, U-shaped leather cup 22, pressing plate 23, sealing plate 24, valve plate 25, fastening with bolt 26 successively.Its piston 40 comprises: suit and be positioned at punch holder 41 on the valve rod boss, U-shaped leather cup 42, middle clamp plate 43, be inverted U-shaped leather cup 44, die holder 45 successively, and fastening with bolt 46.The middle part of its lower cover 50 has is equipped with drain valve 70 in water-aspirator pressure water inlet 61, the hole, referring to Fig. 2, shown in Figure 3, drain valve is made up of valve seat 71, hollow valve head 72, nut 73, and valve seat is threaded in the water intake, and hollow valve head 72 is threaded with valve seat 71 and is fastening with nut 73.The outer surface of hollow valve head has the groove 74 of vertical perforation.Its valve opening 15 is cylindrical, and nose end has inclined-plane seam 16, and valve plate 25 is upper cone, can prevent sedimentation, and the edge of valve plate has and the corresponding flange 27 of the inclined-plane seam of valve opening end.Its pressing plate 23 can enter in the cylindrical shape valve opening 15 together with U-shaped leather cup 22.The center of its loam cake 50 has valve rod to regulate the jackscrew 52 of location, and loam cake and valve body are with being threaded and being lined with sealing gasket.Its lower cover 60 is threaded with piston cylinder 13 usefulness, and is lined with sealing gasket.

Working procedure of the present utility model is as follows: after water pump is opened, press water is entered piston cylinder 13, is promoted piston 40 and move upward by water intake 61, make on the spool 20 and move, valve opening 15 is opened, and the hot water in the return water system enters valve body by inlet 11 and flows through valve opening 15 from water outlet 12 inflow boilers.When water pump is shut down; no press water in the piston cylinder 13; the thrust that piston 40 makes progress disappears; spool 20 loses holder power, begins to descend, and current are cut off after pressing plate 23 and U-shaped leather cup 22 enter valve opening 15; spool 20 continues to glide under water impact; gliding after the flange 27 of valve plate contacts with valve opening 15 end faces just stops, and internally piloted valve is closed, and has eliminated serious water hammer.

Claims (5)

1, a kind of normal-pressure boiler backwater internally piloted valve, comprise: the horizontally disposed valve body of intake-outlet (10), be positioned at the valve opening (15) at valve body middle part, the valve rod that is connected with valve body (30), be installed in the spool (20) on valve rod top, be positioned at the piston cylinder (13) of valve body (10) bottom, piston (40), and loam cake (50), lower cover (60), it is characterized in that described valve opening (15) end face has inclined-plane seam (16), described spool comprises: suit and be positioned at fixed plate (21) on the valve rod boss successively, U-shaped leather cup (22), pressing plate (23), sealing plate (24), valve plate (25), fastening with nut (26), there is the flange (27) with the corresponding contact of valve opening end chamfer seam (16) at its valve plate (25) edge, pressing plate (23) can enter in the valve opening (15) together with U-shaped leather cup (22), the upper end of described valve rod (30) is installed in the guide pin bushing (51) of loam cake (50), and the lower end of valve rod connects piston (40).

2, according to the described normal-pressure boiler backwater of claim 1 internally piloted valve, it is characterized in that described piston (40) comprising: suit and be positioned at punch holder (41) on the valve rod boss, U-shaped leather cup (42), middle clamp plate (43), be inverted U-shaped leather cup (44), die holder (45) successively, fastening with bolt (46).

3, according to the described normal-pressure boiler backwater of claim 1 internally piloted valve, it is characterized in that described lower cover (60) and piston cylinder (13) with being threaded, there is water-aspirator pressure water inlet (61) at the middle part of lower cover, and drain valve (70) is housed in the hole.

4, according to the described normal-pressure boiler backwater of claim 3 internally piloted valve, it is characterized in that described drain valve (70) is made up of valve seat (71), hollow valve head (72), nut (73), its valve seat is threaded in the water intake (61), and the hollow valve head is threaded with valve seat, and fastening with nut.The outer surface of hollow valve head has the groove (74) of vertical perforation.

5, according to the described normal-pressure boiler backwater of claim 1 internally piloted valve, it is characterized in that described loam cake (50) is threaded with valve body, the center of loam cake has valve rod to regulate the jackscrew (52) of location.

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