JPH0828785A - Thermally-actuated steam trap - Google Patents

Abstract

PURPOSE:To prevent a valve part from suddenly being opened/closed so as to prevent occurrence of water hammer by using temperature control machine elements including media to be expanded/shrunk according to temperature, and arranging a plurality of temperature control machine elements having each different responsiveness in response to the pressure changes of diaphragms, in a lead-through direction. CONSTITUTION:When fluid temperature in a valve body 3 is low, expansion media 15a, 16b are in their shrunk condition, thus temperature control machine elements 9 are upwardly lifed by coil springs 19, and a valve part 18 is separated from a valve seat member 6 so as to fully open a lead-through passage 7. When the fluid temperature in a valve chamber 3 is raised by discharging low temperature fluid so that the expansion media 15a, 16b are expanded, firstly, a thinly formed diaphragm 14a is displaced so as to downwardly displace the temperature control machine elements 9 against the coil springs 19 through connecting members 16a, 16b. Secondly, a thickly formed diaphragm 14b is displaced so as to further clownwardly displace the temperature control machine elements 9, hereby, the valve part 18 gradually closes the valve seat member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, it is heated and cooled by steam and condensate and expands according to its temperature. The present invention relates to a heat-actuated steam trap that discharges condensed water below a desired temperature to the outside of a system by using a temperature control element containing a contracting medium.

[0002]

2. Description of the Related Art The basic structure of a heat-actuated steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, the outer peripheral edge of the diaphragm is fixed between the upper and lower dish-shaped wall members, the expansion medium is enclosed in the internal space between the upper wall member and the diaphragm, and the valve member is connected to the diaphragm. The temperature control element is placed in the valve chamber that communicates with the inlet, and the expansion / contraction of the expansion medium is used to drive the valve member through the diaphragm, and thereby the discharge path that communicates the valve chamber with the outlet. The valve seat member having the above-mentioned structure allows the valve member to be seated on and off.

When a high temperature fluid having a temperature higher than a predetermined temperature flows into the valve chamber, the expansion medium expands to displace the diaphragm in the valve closing direction so that the valve member is seated on the valve seat member and the outlet passage is closed. This prevents the discharge of steam. When a low-temperature fluid below a predetermined temperature flows in, the expansion medium contracts, the fluid pressure in the valve chamber causes the diaphragm to be displaced in the valve opening direction, the valve member separates from the valve seat member, and the lead-out path is opened. . As a result, condensed water and air are discharged outside the system.

[0004]

However, in the heat-actuated steam trap of this type, the valve member rapidly opens and closes the outlet passage due to the displacement of the diaphragm caused by the expansion and contraction of the expansion medium. There has been a problem that a rapid flow of fluid occurs on the inlet side or the outlet side to cause water hammer.

Therefore, a technical problem of the present invention is to obtain a heat-actuated steam trap which does not perform a sudden opening / closing operation.

[0006]

The technical means of the present invention taken to solve the above-mentioned technical problem is a valve seat having an inlet, a valve chamber and an outlet formed by a valve casing and having a discharge passage. A member is disposed between the valve chamber and the outlet, and a temperature control element including a wall member, a diaphragm having an outer peripheral edge fixed to the wall member, and an expansion medium enclosed between the wall member and the diaphragm is provided in the valve chamber. In the heat-actuated steam trap arranged in the above, a plurality of temperature control elements with different responsiveness to the pressure change of the diaphragm are arranged side by side in the axial direction of the discharge path, and the temperature control elements facing the discharge path are arranged. It is characterized in that a valve portion for opening and closing the outlet path is formed and an elastic member for urging the temperature control element in the valve opening direction is provided.

The responsiveness of the diaphragms constituting the respective temperature control elements to pressure changes is that the thickness is different, the presence or absence of ripples and the shape of ripples are different, and the diaphragms are made of materials having different elastic forces. It can be different depending on.

[0008]

The operation of the above technical means is as follows.
Since a plurality of temperature control elements having different responsiveness to the pressure change of the diaphragm are arranged side by side in the axial direction of the outlet path, the diaphragm sensitive to the pressure change due to the expansion of the expansion medium when the valve is closed. The valve portion gradually approaches the valve seat member in a stepwise manner according to the displacement of each diaphragm to fully close the lead-out path. When opening the valve,
Due to the contraction of the expansion medium, the diaphragms which are sensitive to the pressure change are sequentially displaced, and the valve portions are separated from the valve seat member according to the displacements of the respective diaphragms, and gradually separated gradually to fully open the outlet passage. In this way, the opening and closing operation becomes stepwise,
It doesn't happen suddenly.

[0009]

EXAMPLES Examples showing specific examples of the above technical means will be described (see FIGS. 1 to 3). Upper case 1 and lower case
The singing 2 and the singing 2 are screwed together to form a valve casing having the valve chamber 3 therein. An inlet 4 is formed in the upper casing 1 and an outlet 5 is formed in the lower casing 2. A valve seat member 6 is screwed between the valve chamber 3 and the outlet 5. A through passage 7 is formed in the center of the valve seat member 6 to connect the valve chamber 3 and the outlet 5.

Above the valve seat member 6 are located two temperature control elements 8 and 9 arranged side by side vertically. The temperature control elements 8 and 9 are wall members 11 having inlets 10a and 10b, respectively.
a, b and a plug member 12a for sealing the inlets 10a, 10b,
b, the diaphragms 14a, b forming the storage chambers 13a, 13b between the wall members 11a, b, the expansion media 15a, b sealed in the storage chambers 13a, 13b, and the diaphragms 14a, 14b.
It is composed of connecting members 16a, b fixed to the center of b, and fixed wall members 17a, b for fixing the outer peripheral edges of the diaphragms 14a, b between the wall members 11a, b. The lower surface of the plug member 12b of the temperature control element 9 on the lower side forms a valve portion 18 for seating on and off the valve seat member 6 to open and close the outlet passage 7. The diaphragm 14a is formed thinner than the diaphragm 14b. Ripples are formed on the diaphragms 14a and 14b. The expansion media 15a and 15b are made of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The temperature control elements 8 and 9 are urged upward by a coil spring 19 as an elastic member disposed below the lower temperature control element 9, and the upper temperature control element 8 is urged.
The outer periphery of the upper surface of the wall member 11a is held against the lower surfaces of a plurality of ribs 20 formed on the inner periphery of the upper casing 1. The outer circumferences of the temperature control elements 8 and 9 are vertically guided by a plurality of ribs 21 formed on the inner circumference of the lower casing 2.

When the temperature of the fluid flowing into the valve chamber 3 is low, the expansion media 15a and 15b contract, and the diaphragms 14a and 14b are displaced toward the wall members 11a and 11b, respectively, as shown in FIG. . The temperature control element 9 is lifted upward by the elastic force of the coil spring 19, and the valve portion 18 is separated from the valve seat member 6 to fully open the lead-out path 7.

When the temperature of the fluid flowing into the valve chamber 3 rises due to the discharge of the low temperature fluid, the expansion medium 15
a and b expand. The thin diaphragm 14a, which is sensitive to pressure changes, is fixed to the fixed wall member 17a.
Side, the temperature control element 9 is displaced downward via the connecting members 16a and 16b against the elastic force of the coil spring 19, and the valve portion 18 is moved to the valve seat member 6 as shown in FIG. Get closer. Subsequently, the thickly formed diaphragm 14b, which is insensitive to the pressure change, is displaced toward the fixed wall member 17b, and the temperature control element 9 is displaced further downward against the elastic force of the coil spring 19, as shown in FIG. As shown, the valve portion 18 is seated on the valve seat member 6 to close the outlet passage 7.

When the temperature inside the valve chamber 3 decreases or the temperature of the inflowing fluid decreases due to heat radiation or the like, the expansion medium 15
a and b contract. First, the thinly formed diaphragm 14a, which is sensitive to pressure changes, is displaced toward the wall member 11a, the elastic force of the coil spring 19 causes the temperature control element 9 to be displaced upward, and the valve portion 18 moves toward the valve seat member. Move away from 6. Subsequently, the thickly formed diaphragm 14b, which is insensitive to the pressure change, is displaced toward the wall member 11b, and the elastic force of the coil spring 19 causes the temperature control element 9 to be displaced further upward, resulting in the state shown in FIG. .

In the above embodiment, the diaphragms having different thicknesses are exemplified, but the response to the pressure change is obtained by forming the ripples on one diaphragm or by making the shapes of the ripples formed on both diaphragms different. You may have different sex. Also, by using a diaphragm made of materials with different elastic forces, for example,
One diaphragm may be made of stainless steel or nickel-molybdenum alloy represented by Hastelloy (trademark), and the other diaphragm may be made of phosphor bronze, or the same stainless steel may be used to change the carbon content. Alternatively, the responsiveness to pressure changes may be made different by using different chemical components. Further, in the above embodiment, two temperature control elements are arranged, but it is of course possible to arrange three or more. Further, although the fixed wall members are faced to each other, the wall members may be faced to each other or the wall member and the fixed wall member may be faced to each other.

[0016]

The present invention produces the following unique effects. As described above, the heat-actuated steam trap according to the present invention is
Since the valve does not open and close the outlet path suddenly,
No hammer is generated, and the valve portion and valve seat member are not damaged.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fully open state of a thermally actuated steam trap according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a half-opened state in which the heat-actuated steam trap of the embodiment of the present invention goes from fully open to fully closed.

FIG. 3 is a cross-sectional view showing a fully closed state of the thermally responsive steam trap according to the embodiment of the present invention.

[Explanation of symbols]

 3 valve chamber 4 inlet 5 outlet 6 valve seat member 7 outlet passage 8, 9 temperature control element 11a, b wall member 14a, b diaphragm 15a, b expansion medium 18 valve portion 19 coil spring

Claims (1)

[Claims] 1. A valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member having a lead-out path is arranged between the valve chamber and the outlet, and a wall member and an outer peripheral edge are fixed to the wall member. A temperature control element composed of a diaphragm and an expansion medium enclosed between the wall member and the diaphragm is arranged in the valve chamber, and a plurality of temperature control elements having different responsiveness to the pressure change of the diaphragm are provided. Are arranged side by side in the axial direction of the derivation path, a valve portion for opening and closing the derivation path is formed in the temperature control element facing the derivation path, and an elastic member for urging the temperature control element in the valve opening direction is provided. Thermally actuated steel characterized by
Mutrap.