JPH10141591A - Heat responding steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat responding steam trap which can discharge condensed water between a diaphragm and a lower wall member when steam transferring is suspended. SOLUTION: Arranged inside a valve chamber 6 communicated with an inlet 5 is a temperature controlling element 10 having an upper wall member 12, a lower wall member 21 formed with a center hole 19 and a communication hole 20, upper and lower diaphragms 15, 17 whose outer peripheral edges are fixed between the wall members 12 and 21, an expansion medium 16 sealed between the upper wall member 12 and the upper diaphragm 15, and a valve member 18 connected to the lower diaphragm 17. An induction passage 9 communicating the valve chamber 6 with an outlet 7 is thus opened and closed. The communication hole 20 has an opening area to the extent that is not blocked by surface tension of condensed water.

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. 7-174295. As understood from the publication, an upper wall member, a lower wall member having a central hole and a pore, a diaphragm having an outer peripheral edge fixed between both wall members, and a diaphragm between the upper wall member and the diaphragm. The enclosed expansion medium and a temperature control element having a valve member connected to the diaphragm are arranged in a valve chamber communicating with the inlet, and the valve member is driven through the diaphragm by utilizing expansion and contraction of the expansion medium. This opens and closes an outlet path communicating the valve chamber and the outlet.

[0003]

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 diaphragm is displaced in the valve closing direction, and the valve member closes the outlet passage. This prevents the discharge of steam. When a low-temperature fluid having a temperature equal to or lower than a predetermined temperature flows, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, and the valve member opens the outlet passage. As a result, condensate and air are discharged out of the system.

[0004] However, in such a type of thermo-responsive steam trap, when the steam transportation is stopped, the condensate between the diaphragm of the temperature control element and the lower wall member is not discharged. This condensate causes bacteria to multiply by this condensate, which is a serious problem particularly when used in the food and medical fields. The lower wall member has a central hole and pores, but the pores are for introducing pressure and have a small opening area. This is because the condensate on the outer peripheral side remains.

Accordingly, it is an object of the present invention to provide a thermally responsive steam trap which can discharge condensate between the diaphragm and the lower wall member when steam transportation is stopped.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems includes an upper wall member,
A temperature control comprising a lower wall member having a central hole, a diaphragm having an outer peripheral edge fixed between both wall members, an expansion medium sealed between the upper wall member and the diaphragm, and a valve member connected to the diaphragm. In a thermally responsive steam trap, an element is arranged in a valve chamber communicating with an inlet, and a valve member is driven by displacement of a diaphragm due to expansion and contraction of an expansion medium to open and close an outlet path connecting the valve chamber and the outlet. A heat-responsive steam trap is characterized in that a communication hole having an opening area large enough not to be blocked by the surface tension of condensate is opened in a lower wall member.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat-responsive steam trap according to the present invention has a lower wall member having a central hole and a communication hole having an opening area large enough not to be blocked by the surface tension of condensate. is there. Therefore, when the steam transportation is stopped, the condensate between the diaphragm and the lower wall member is discharged to the outlet through the central hole and the communication hole.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The inlet side member 1 and the outlet side member 2 are fixed by a mounting member 4 with a sealing member 3 interposed therebetween for maintaining airtightness therebetween to form a casing. Inlet side member 1
, An inlet 5 is formed, a valve chamber 6 is formed between the inlet side member 1 and the outlet side member 2, and an outlet 7 is formed in the outlet side member 2. An outlet path 9 for communicating the valve chamber 6 with the outlet 7 is formed in the partition wall 8 of the outlet side member 2 forming the bottom wall of the valve chamber 6. The inlet 5, the outlet 9 and the outlet 7 are formed coaxially.

A temperature control element 10 is arranged in the valve chamber 6.
The temperature control element 10 includes an upper wall member 12 having an inlet 11.
A plug member 13 for sealing the inlet 11 and an upper wall member 12
An upper diaphragm 15 forming an accommodation chamber 14 between the
An expansion medium 16 sealed in the storage chamber 14, a valve member 18 fixed to the lower diaphragm 17, a central hole 19 and a communication hole 2;
A lower wall member 21 having outer peripheral edges of the upper and lower diaphragms 15 and 17 sandwiched between the outer peripheral edges of the upper wall member 12
And a stopper 22 fixed to the upper wall member 12. Reference numeral 23 indicates a welded portion where the outer peripheral edges of the upper and lower wall members 12 and 21 and the upper and lower diaphragms 15 and 17 are fixed.

The temperature control element 10 is urged toward the lead-out path 9 by a coil spring 24 disposed between the temperature control element 10 and the inlet-side member 1, and the outer periphery of the lower surface of the lower wall member 21 is moved from the inner periphery of the outlet-side member 2 to the partition wall 8. Of the plurality of ribs 25 formed over the entire surface. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. As shown in FIG. 2, eight communication holes 20 of the lower wall member 21 are provided, each having an opening area which is not closed by the surface tension of the condensed water.

The operation of this embodiment is as follows. When the fluid temperature in the valve chamber 6 becomes lower than a predetermined value due to heat radiation, or when a low-temperature fluid flows into the valve chamber 6 from the inlet 5,
The expansion medium 16 contracts, the upper and lower diaphragms 15 and 17 are displaced upward by the application of the fluid pressure at the inlet 5, and the valve member 18 opens the outlet passage 9. Thereby, low-temperature condensate and air are discharged to the outlet 7.

When the temperature of the fluid flowing into the valve chamber 6 rises due to the discharge of the low-temperature fluid, the expansion medium 16 expands, and the valve member 1 passes through the upper and lower diaphragms 15 and 17.
8 is displaced downward to close the lead-out path 7 and prevent leakage of steam. By repeating such opening and closing operations, steam is not released and the condensate is automatically discharged.

When the steam transport is stopped, the condensed water between the lower diaphragm 17 and the lower wall member 21 is discharged from the central hole 19 and the communication hole 20 to the outlet 7 through the outlet passage 9.

[0014]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
When condensed water does not remain between the diaphragm and the lower wall member when the steam transportation is stopped, the propagation of bacteria can be prevented, and it can be used in the food and medical fields.

[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.

FIG. 2 is a sectional view of the lower wall member taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet side member 2 Outlet side member 4 Attachment member 5 Inlet 6 Valve room 7 Outlet 9 Outgoing path 10 Temperature control element 12 Upper wall member 15 Upper diaphragm 16 Expansion medium 17 Lower diaphragm 18 Valve member 19 Central hole 20 Communication hole 21 Lower Wall material

Claims (1)

[Claims] An upper wall member, a lower wall member having a central hole, a diaphragm having an outer peripheral edge fixed between the two wall members,
An expansion medium sealed between the upper wall member and the diaphragm;
A temperature control element having a valve member connected to a diaphragm is disposed in a valve chamber communicating with an inlet, and an outlet path for driving the valve member by displacement of the diaphragm due to expansion and contraction of the expansion medium to communicate the valve chamber with the outlet. And a communication hole having an opening area large enough not to be blocked by the surface tension of the condensate, is provided in the lower wall member.