CN1004830B

CN1004830B - Steam trap

Info

Publication number: CN1004830B
Application number: CN87107580.6A
Authority: CN
Inventors: 张立夫
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-10-21
Filing date: 1987-10-21
Publication date: 1989-07-19
Also published as: CN87107580A

Abstract

The present invention provides a heat expansion type drain valve which is suitable for the working pressure of at most 25 kgf/ cm<2>. The heat expansion type drain valve is characterized in that control and the purposes of steam blockage and water discharge are achieved by a volumetric expansion quantity generated by a combined body formed by casting a corrugated pipe and elastic materials in the change of temperature. The heat expansion type drain valve also has adjustability and continuous water discharge capability.

Description

Drain valve

The present invention relates to a kind of drain valve, particularly a kind of thermosensitive element adopts rubber and bellows is cast in block or only use the drain valve of rubber material.

The present invention is to be the continuation of 85108332 patent application by the application number that I submitted on November 16th, 1985.

The disclosed bellows drain valve that is used for steam heating in the U.S. Pat 3876139.Its thermosensitive element-bellows only utilized at work the axial displacement △ of elastic shell *, for the fixing elastic shell of an end, when under the situation of being heated, doing axial elongation, though moving direction is X axis basically, but, bear the laterally poor ability of (Y direction) effect because the rigidity of elastic shell own is very poor unstable again.After obstacle or object (valve seat) are touched in the mobile terminal, the easy warpage of bellows housing, especially the intermediate portion can outwards be plowed, so often can not guarantee the normal position that coincide between flap and the valve seat, its result causes that vapour is exactly the concentrated breach that occurs of certain position stress of elastic shell with Louing.This is especially serious for the lengthy bellows in the heavy caliber drain valve (the more person of wave number).Because the heavy caliber drain valve needs bigger shift value △ X and bears bigger steam total pressure.For example, general bore Dg32 will have 10～15 ripples could obtain the drain opening flow area of energy enough, yet the increase of wave number tends to cause the Lou increasing of vapour rate and the cracking of bellows.In addition, the drain valve of ripple tubing also has a weakness.After internal liquid was heated vaporization, internal pressure increased suddenly, and its value is often near the allowable stress of its elastic shell.Add the back flexible shell that expands and be subjected to external extruding force, this just breaks housing easily, is again forced element because the bellows housing is a thermosensitive element, and it is undertaking dual effect.Analyze from mechanics, shell inner surface is subjected to the outside uniform active force of expanding gas, and outside has only the concentrated active force (after flap touches valve seat) of two ends.To making case material be in many stress phases, in case surpass the value that material allowed, housing will break.

The object of the present invention is to provide a kind of temperature-sensitive sensing device of new model, by increasing the stroke of flap element, with sensitivity and the reliability of improving the valve block steam and drain water.

Another object of the present invention provides a kind of knockdown bellows temperature-sensitive sensing device, to improve the stress of bellows element in the present technology.To improve the durability of this element.

A further object of the present invention provides a kind of good start-stop performance, the drain valve of the valve mechanism of anti-leak-stopping vapour.

Above-mentioned purpose of the present invention realizes by following proposal.In a hydrophobic valve device of mainly forming by shell, thermal sensor element and setting device thereof.Rubber material and the inner thermal sensitivity expander that fills easy evaporating liquid bellows cast solid formation combined structure type have been adopted.It is limited in the stiff case of an end opening, handles the unlatching size of flap with their volumetric expansion amount.For the little small-bore drain valve of flap displacement amount.Expander only is made up of a kind of material of rubber.Whole in addition thermal sensor element and flap are in valve pocket, and setting device and valve seat are floating type relatively.

Advantage of the present invention is to replace in the past single linear expansion principle with the volumetric expansion principle.Obtain bigger hot static(al) effect stroke with less assembly, thereby improved the ability of heat sensitivity and block steam and drain water; Another advantage of the present invention is that bellows is cast in rubber body, and rubber body is limited in the stiff case again.Thereby improved the stress of bellows, improved the mechanical strength and the stability of thermosensitive element; Another advantage is that thermal sensor element and flap are floating type in valve pocket.Just avoided action that thermosensitive element expands with heat and contract with cold influence, flap and valve seat can normally have been coincide, thereby reach steam-tight purpose the flap orientation.

Design of the present invention and purpose thereof will can be further understood by following examples also in conjunction with the accompanying drawings.

Accompanying drawing 1 is the longitudinal sectional view according to the hydrophobic valve of a most preferred embodiment of the present invention.

Fig. 2 is the horizontal section of 1-1 position among Fig. 1.

Fig. 3 is the longitudinal sectional view of an alternative embodiment of the invention.

Referring to figs. 1 through 3, shell (10) comprises housing (11), valve seat (12), inlet (13), outlet (14) and valve pocket (15).The ingress is provided with filtrating equipment (16), and (16) are web plate among Fig. 1; (16) are the net tube among Fig. 3, and are stuck in the dirt-discharging hook (17), with packing ring (18) sealing.Thermal sensor element (20) comprises the stiff case plum blossom shell (21) of an end opening, the thermal sensitivity expander (22) that rubber (23) and metal bellows (24) are cast together is housed in the shell, fill evaporable liquid (25) in the metal bellows (24), seal (26) and link with screw thread with plum blossom shell (21).Flap (27) is inserted in (26) center of sealing, and end studs with teflon top (28), the outer spring (29) that is with of flap (27).Setting device (30) is by adjusting screw rod (31), stop-nut (32), bonnet (33), and packing ring (34) and O RunddichtringO (35) are formed.

This valve function is as follows: the filtrating equipment (16) that the medium that comes in the pipeline is located by inlet (13) enters valve pocket (15), and the water jacket through plum blossom shell (21) flows through outside the slit expulsion valve of flap (27) and valve seat (12) again.The saturation temperature of supposing steam and water of condensation is T ℃, earlier position in the valve is adjusted, and when steam entered in the chamber with the water of condensation that is higher than T ℃, expander (22) was met thermal expansion, makes closed mouthful to close, and steam just no longer enters; When the water of condensation that is lower than T ℃ entered, expander (22) shrank, and borrowed spring force that closed mouthful is strutted, and made water of condensation pass through the water jacket of plum blossom shell (21), flowed out outside the valve.The effect of plum blossom shell is that the volumetric expansion amount (X, Y, Z three degree swell incremenies) when making expander (22) heat expansion of rubber (23) and bellows (24) is converted into X axis displacement amount △ X, and △ X is complementary certainly with the height that enters cavity condensing water temperature T.Be that T is high more, △ X is just big more, and then water displacement is little; Otherwise T reduces, and △ X is just more little, and then water displacement is big, and this has just reached our purpose.

Further specify from hot static(al) principle, thermal expansion body is that (the volumetric expansion amount is △ V by first expansion element (23) rubber ₁) and second expansion element (24) bellows (the volumetric expansion amount is △ V ₂) form a comprehensive heat-swelling element jointly, its total volumetric expansion amount is △ V=△ V ₁+ △ V ₂, first expansion element (23) rubber that particularly points out, except self as the thermosensitive element that expands with heat and contract with cold, and shoulder the Volume Changes value △ V that even transmission second expansion element (24) bellows is produced in process of expansion and contraction ₂Because it is a kind of elastic material.Can in being subjected to thermal process, have the ability that resiles.Expander relends the effect that helps rigidity plum blossom shell, to be converted into by the volumetric expansion amount △ V that temperature variation causes along the displacement amount △ X of the axial component assemblying body of its opening, handle flap with this, realize flap being opened the control of size with the flowing medium temperature variation.Thereby reach the purpose of block steam and drain water, for small-bore drain valve, expander only needs element of first expansion element (23) rubber to form, because small-bore drain valve flap displacement amount is less, can satisfy.When the vaporization of bellows interior heated liquid outwards produces uniform active force, also be subjected to outside flexible rubber and inwardly produced uniform reaction force, these two kinds of even distributed forces all act on the shell wall side, direction is opposite, numerical value about equally, so cancel out each other basically, this just alleviated widely housing the elasticity tension of burden.Therefore the present invention's housing of working under higher vapor pressure also is unlikely cracking.

As seen from the figure, thermal sensor element (20) and flap (27) are that bear against, unsteady with respect to valve seat (12) and adjusting screw rod (31), are not that rigidity links.The action that they expand with heat and contract with cold can not have influence on the normal of flap and valve seat and coincide.

What deserves to be explained is that bellows (24) is the bottom surface of being close to plum blossom shell (21), to form the bottom of a pan shape heating surface, because wave number is (generally only 2～3) seldom, though other face castings are in rubber (23), reduced a part of direct heating surface, still compensated and have a surplus because bigger volumetric expansion amount is arranged.

When this valve is adjusted for the first time, but take-off the brake nut (32) turns adjusting screw rod (31) with screw-driver, when an exhaust port draining is not leaked vapour, just can tighten stop-nut (32), regulates promptly to accuse to finish, and this valve just can normally use.

Claims

1, drain valve of forming by the shell that has valve seat, thermal sensor element and setting device thereof, it is characterized in that the thermal sensitivity expander is to be cast together and be limited in the stiff case of an end opening by rubber and metal bellows, handles the unlatching size of flap with their volumetric expansion amount.

2, according to the said drain valve of claim 1, the rubber that it is characterized by in the wherein said thermal sensitivity expander can be fluorine rubber or ethylene propylene rubber or neoprene or above several synthetic rubber.

3,, it is characterized in that being filled with in the metal bellows (24) evaporable liquid (25) according to the said drain valve of claim 1.

4, according to the said drain valve of claim 1, it is characterized in that stiff case can be that the opening end of plum blossom shell (21) compresses with sealing (26), seal and be inserted with flap (27) in (26) and directly contact with expander (22).

5,, it is characterized in that said thermal sensor element (20) and flap (27) float with respect to setting device and valve seat (12) in valve pocket according to the said drain valve of claim 1.

6, according to the said drain valve of claim 1, the set filtrating equipment (16) of inlet that it is characterized in that shell (11) can be web plate or net tube.

7,, it is characterized in that for the little small-bore drain valve of flap displacement amount, expander (22) only is made up of a kind of material of rubber (23) according to claim 1 and 2 said drain valves.