JPH11148596A - Thermally-actuated steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermally actuated steam trap which can simply build a trap with a different temperature of exhausted fluid. SOLUTION: A casing is composed of an upper segment 1 and lower segment 2 in which an inlet 4, valve chest 3, and outlet 5 are provided. A valve seat member 8 provided with a leadout passage 7 to put the valve chest 3 in communication with the outlet 5 is coupled by screw with the transverse wall 6 of the lower segment of casing 2. A temp. controlling element 10 is installed in the valve chest 3. The element 10 is formed by encapsulating an expansive medium 16 in the internal space 14 generated by attaching together the peripheral edges of a wall member 12 and a diaphragm 15 and coupling a valve member 17 with the diaphragm 15. A spacer 23 is interposed between the lower wall member 18 of the temp. controlling element 10 and a rib 19 of the lower segment of casing 2. Trap with a different temperature of the exhausted fluid is built by using spacer(s) 23 of different thickness or differing the distance between the valve seat member 8 and valve member 17 through an increase or decrease in the number of spacers 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in various steam-using equipment and steam pipes, and more particularly, to a temperature including a medium which is heated, expanded, cooled, and contracted. The present invention relates to a heat-responsive steam trap for discharging a fluid having a temperature lower than a desired temperature out of a system by using a control element.

[0002]

2. Description of the Related Art A thermally responsive steam trap using a temperature control element is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 8-28787. As understood from the publication, an inlet, a valve chamber, and an outlet are formed by casing, a valve seat member having an outlet path is attached between the valve chamber and the outlet, and a wall member and an outer peripheral edge of the diaphragm are fixed. A temperature control element having a valve member connected to the diaphragm is mounted in the valve chamber, and the diaphragm member is displaced and seated on the valve seat member by displacement of the diaphragm due to expansion and contraction of the expansion medium. This opens and closes the outlet route. The expansion medium is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

[0003]

When a high-temperature fluid of a predetermined temperature or more flows into the valve chamber, the expansion medium expands and the pressure in the internal space increases, and the diaphragm opposes the fluid pressure on the inlet side. The valve member is displaced in the valve closing direction to close the lead-out path. This prevents the discharge of steam. When a low-temperature fluid of a predetermined temperature or less flows in, the expansion medium contracts and the pressure in the internal space drops, and the diaphragm is displaced in the valve opening direction by the fluid pressure on the inlet side, and the valve member opens the outlet passage. . As a result, condensate and air are discharged out of the system.

[0004] However, such a thermo-responsive steam trap has a problem that it is difficult to make a trap having a different temperature of the discharged fluid.
That is, when the temperature of the discharged fluid is made different, a temperature control element in which an expansion medium having a different component is sealed must be made.

Accordingly, it is an object of the present invention to provide a thermo-responsive steam trap which can easily produce traps having different exhaust fluid temperatures.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is that a valve seat member having an inlet, a valve chamber, and an outlet formed by casing and having an outlet path. Is mounted between the valve chamber and the outlet, and an expansion medium is sealed in an internal space formed by fixing the outer peripheral edge of the diaphragm to the wall member, and a temperature control element having a valve member connected to the diaphragm is mounted in the valve chamber, thereby expanding the valve chamber. A valve member is attached to and detached from a valve seat member by a displacement of a diaphragm due to expansion and contraction of a medium to open and close a lead-out path, and a distance between the valve seat member and the valve member is set between a temperature control element and a casing. A heat-responsive steam trap characterized by interposing a spacer to be adjusted.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoresponsive steam trap of the present invention has a spacer for adjusting the distance between the valve seat member and the valve member between the temperature control element and the casing. . Therefore, by using a spacer having a large thickness, or by increasing the number of spacers to reduce the distance between the valve seat members, the valve member can be quickly closed by the expansion of the expansion medium. Since it sits on the member and closes the lead-out path,
The temperature of the discharge fluid is reduced. Conversely, by using a spacer having a small thickness, or by increasing the distance between the valve seat member and the valve member by reducing the number of spacers, the valve member is delayed by the expansion of the expansion medium. Since the outlet path is closed by sitting on the seat member, the temperature of the discharged fluid increases. As described above, by adjusting the distance between the valve seat member and the valve member by the spacer, traps having different temperatures of the discharged fluid can be easily formed.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). Upper case 1 and lower case 2
Are screwed together to form a casing having a valve chamber 3 therein. The upper case 1 has an inlet 4 and the lower case 2 has an outlet 5. The inlet 4 and the outlet 5 are formed coaxially. A valve seat member 8 having an outlet 7 communicating the valve chamber 3 and the outlet 5 is screwed to the transverse wall 6 of the lower casing 2. The lead-out path 7 includes a valve hole 21 and an orifice hole 22 having an opening area smaller than that of the valve hole 21, which are sequentially formed from the valve chamber 3 side to the outlet 5 side.

A temperature control element 10 is arranged above the valve seat member 8. The temperature control element 10 includes a wall member 12 having an inlet 11, a plug member 13 for sealing the inlet 11, and a diaphragm 15 forming an internal space 14 between the wall member 12.
An expansion medium 16 sealed in the internal space 14, a valve member 17 fixed to the diaphragm 15 by welding, and a lower wall member 18 fixed by welding with the outer peripheral edge of the diaphragm 15 sandwiched between the wall member 12. Be composed. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The temperature control element 10 is urged toward the valve seat member 8 by a spring 20 attached to the lower casing 2 so that the outer periphery of the lower surface of the lower wall member 18 is formed on the inner periphery of the lower casing 2. The ribs 19 are held against the steps of the plurality of ribs 19. A spacer 23 is interposed between the outer periphery of the lower surface of the lower wall member 18 and the step of the rib 19. When making a trap with a low temperature of the discharged fluid, a spacer 23 having a large thickness is used, or the number of the spacers 23 is increased to reduce the distance between the valve seat member 8 and the valve member 17. Conversely, when making a trap with a high temperature of the discharged fluid, a spacer 23 having a small thickness is used, or the number of the spacers 23 is reduced to increase the distance between the valve seat member 8 and the valve member 17. .
Reference numeral 26 designates a screen fixed between the upper case 1 and the lower case 2 for capturing foreign matter.

The operation of this embodiment is as follows. At the time of start, the temperature in the valve chamber 3 is low, the expansion medium 16 contracts, the diaphragm 15 is displaced in the valve opening direction by the fluid pressure on the inlet 4 side, and the valve member 17 is separated from the valve seat member 8. The outlet path 7 is open. Thereby, low-temperature condensate and air are discharged from the outlet 5.

When the temperature of the fluid flowing into the valve chamber 3 increases due to the discharge of the low-temperature fluid, the expansion medium 16 expands, and the diaphragm 15 moves in the valve closing direction against the fluid pressure on the inlet 4 side. And the valve member 17 is moved to the valve seat member 8.
And the outlet path 7 is closed. This prevents vapor leakage. When the distance between the valve seat member 8 and the valve member 17 is formed small by the spacer 23, the valve member 17 is quickly seated on the valve seat member 8 by the expansion of the expansion medium, and the outlet path 7 is closed. Therefore, the temperature of the discharged fluid is lowered. On the contrary, the valve seat member 8 and the valve member 1 are
When the distance between the members 7 is large, the temperature of the discharged fluid increases because the valve member 17 is seated on the valve seat member 8 and closes the outlet passage 7 by the expansion of the expansion medium.

When the temperature of the fluid in the valve chamber 3 becomes lower than a predetermined value due to heat radiation, the expansion medium 16 contracts and the diaphragm 15 is displaced in the valve opening direction by the fluid pressure on the inlet 4 side, and the valve member 17 is opened. Departure path 7 from seat member 8
Open. Thereby, low-temperature condensate and air are discharged from the outlet 5.

[0014]

The present invention has the following specific effects. As described above, according to the present invention, it is possible to easily make traps having different temperatures of discharged fluid by changing the thickness and the number of spacers interposed between the temperature control element and the casing.

[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.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper casing 2 Lower casing 3 Valve room 4 Inlet 5 Outlet 7 Outgoing route 8 Valve seat member 10 Temperature control element 12 Wall member 14 Internal space 15 Diaphragm 16 Expansion medium 17 Valve member 18 Lower wall member 19 Rib 23 Space Sa

Claims (1)

[Claims] An interior formed by forming an inlet, a valve chamber, and an outlet by casing, attaching a valve seat member having an outlet passage between the valve chamber and the outlet, and fixing the wall member and the outer peripheral edge of the diaphragm. The expansion medium is sealed in the space, and a temperature control element with a valve member connected to the diaphragm is installed in the valve chamber. A thermoresponsive steam trap, wherein a spacer for adjusting the distance between the valve seat member and the valve member is interposed between the temperature control element and the casing.