JP3381114B2 - Thermo-responsive steam trap - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling various types of steam by using a temperature control element including a medium which is heated and cooled by steam and condensate and expands and contracts according to the temperature. The present invention relates to a thermo-responsive steam trap that automatically discharges condensate generated in used equipment and steam piping, and more particularly to a thermo-responsive steam trap that can discharge a large amount of condensate. 2. Description of the Related Art The basic configuration of a thermally responsive steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, a temperature control element in which an expansion medium is sealed between a wall member and a diaphragm is disposed in a valve chamber communicating with the inlet, and the displacement of the diaphragm due to expansion and contraction of the expansion medium causes the valve chamber to move. The outlet path that communicates with the outlet is opened and closed. When a high-temperature fluid having a temperature equal to or higher than a predetermined temperature flows into the valve chamber, the expansion medium expands, the internal pressure increases, and the diaphragm is displaced in the valve closing direction to close the outlet passage. This prevents the discharge of steam. When a low temperature fluid below a predetermined temperature flows in, the expansion medium contracts and the internal pressure decreases,
The diaphragm is displaced in the valve opening direction to open the outlet path.
As a result, condensate and air are discharged out of the system. [0004] However, in such a thermo-responsive steam trap of this type, only a single outlet passage is opened and closed by a temperature control element, so that the discharge capacity is reduced. However, there is a problem that it is not suitable for discharging a large amount of condensate. [0005] Accordingly, it is an object of the present invention to provide a large-volume heat-responsive steam trap capable of discharging a large amount of condensate. Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to provide an inlet by a valve casing, a valve chamber communicating with the inlet, and a first valve. And a temperature control element which forms an outlet communicating with the valve chamber via two outlet paths and has an expansion medium sealed between first and second diaphragms having different responsiveness to pressure change. This is a heat-responsive steam trap which is disposed between the outlet passages and opens and closes the two outlet passages by displacement of the two diaphragms due to expansion and contraction of the expansion medium. [0007] The first diaphragm and the second diaphragm,
Responsiveness to pressure changes can be varied by varying the thickness, the presence or absence of ripples and the shape of the ripples, or by using materials having different elastic forces. The operation of the above technical means is as follows.
When a high-temperature fluid having a temperature equal to or higher than a predetermined temperature flows into the valve chamber, the expansion medium sealed between the first and second diaphragms expands to increase the internal pressure, and the first and second diaphragms face each other.
Displaced in the direction of the outgoing path and the second outgoing path, and the two outgoing paths are closed. When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows, the expansion medium contracts and the internal pressure decreases, and the two diaphragms open the first outlet passage and the second outlet passage, respectively. As described above, since the two outlet paths are opened and closed by the temperature control element, the discharge capacity can be increased, and a large amount of condensate can be discharged. Further, since the first diaphragm and the second diaphragm have different responsiveness to a pressure change, the diaphragm sensitive to the pressure change first displaces and opens or closes one of the outlet paths, and subsequently is insensitive to the pressure change. The other diaphragm is displaced to open and close the other outlet path. As described above, since the two outlet paths are not opened and closed at the same time, a rapid flow of fluid accompanying the on-off valve does not occur, and there is no danger of inducing water hammer. An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The body 1 and the end member 2 are connected by bolts (not shown) to form a valve casing having a valve chamber 3 therein. An inlet 4 is formed in the end member 2 and the main body 1 is formed.
Has an outlet 5 coaxial with the inlet 4. Entrance 4
Communicates with the valve chamber 3 through inflow passages 6 and 7 formed in the main body 1. A first valve seat member 9 having a first outlet passage 8 opened and a second valve seat member 11 having a second outlet passage 10 opened coaxially in a partition wall between the valve chamber 3 and the outlet 5. Screw-connected. The valve chamber 3 communicates with the outlet 5 from the first and second outlet passages 8 and 10 through the outside of the partition wall. A temperature control element 12 is arranged between the first valve seat member 9 and the second valve seat member 11, and is held by a spring 13. The temperature control element 12 is formed by fixing the outer peripheral edge of the first diaphragm 14 and the outer peripheral edge of the second diaphragm 15 and sealing the expansion medium 16 in an internal space formed therebetween.
The first diaphragm 14 is formed thin so that the response to a pressure change is more sensitive than that of the second diaphragm 15. The expansion medium 16 is water, a liquid having a lower boiling point than water,
Alternatively, it is formed of a mixture thereof. Valve members 17 and 18 for opening and closing the outlet passages 8 and 10 are fixed to the center of the first and second diaphragms 14 and 15, respectively. A wall member 1 having an opening at the center of the outer peripheral edge of the first and second diaphragms 14 and 15 for opening and closing the valve members 17 and 18.
The outer peripheral edges of 9, 20 are fixed. When the temperature of the fluid flowing into the valve chamber 3 is high, the expansion medium 16 sealed between the first and second diaphragms 14 and 15 expands to increase the internal pressure. And
First, the first diaphragm 14, which is formed to be thin and is sensitive to a change in pressure, is displaced toward the first valve seat 9 and the first diaphragm 14
The outlet path 8 is closed. Subsequently, the second diaphragm 15 which is insensitive to a change in pressure formed thickly is displaced toward the second valve seat 11, and the second outlet passage 10 is closed by the valve member 18. When the temperature in the valve chamber 3 decreases due to heat radiation or the temperature of the fluid flowing into the valve chamber 3 is low, the expansion medium 16 contracts and the internal pressure in the internal space decreases. Then, first, the first diaphragm 14 is displaced, and the valve member 17 opens the first outlet passage 8, and subsequently, the second diaphragm 15 is displaced, and the valve member 18 opens the second outlet passage 10. In the above embodiment, an example using diaphragms having different thicknesses has been described. However, by forming a ripple on one of the diaphragms or making the shapes of the ripples formed on both of the diaphragms different, a response to a pressure change can be obtained. Sex may be different. Also, by using a diaphragm formed of materials having different elastic forces, for example,
One diaphragm is made of stainless steel or a nickel-molybdenum alloy represented by Hastelloy (trade name), and the other diaphragm is made of phosphor bronze, or the carbon content is changed even if the same stainless steel is used. Alternatively, the responsiveness to a pressure change may be varied by using different chemical components. The present invention has the following specific effects. As described above, according to the present invention, since two outlet paths can be opened and closed by the temperature control element, a large amount of condensate can be discharged, and a large amount of heat-responsive steam trap can be provided.
Also, since the two outgoing paths can be opened and closed sequentially by the temperature control element, it is possible to prevent the rapid flow of fluid accompanying the on-off valve, and to provide a heat-responsive steam trap that does not cause water hammer. Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a thermally responsive steam trap according to an embodiment of the present invention. [Description of Signs] 1 Main body 2 End member 3 Valve chamber 4 Inlet 5 Outlet 8 First outlet path 10 Second outlet path 12 Temperature control element 14 First diaphragm 15 Second diaphragm 16 Expansion medium

Claims (1)

(57) [Claim 1] An inlet, a valve chamber communicating with the inlet by valve casing, and an outlet communicating with the valve chamber via first and second two lead-out paths. A temperature control element formed and filled with an expansion medium between first and second diaphragms having different responsiveness to a pressure change is disposed between the two outlet paths, and displacement of both diaphragms due to expansion and contraction of the expansion medium. By the said 2
A thermo-responsive steam trap characterized by opening and closing two outlet paths.