JPH04262196A - Thermal type steam trap - Google Patents

Abstract

PURPOSE:To open or close a valve member at the time when a diaphragm is broken, in a thermal type steam trap. CONSTITUTION:A low-pressure chamber 18 is formed between a valve seat member 9 and a diaphragm 13. A valve seat member 9 is formed with an outlet passage 21 communicating the low-pressure chamber 18 with an exit 7 as well as introduction passages 22, 23 communicating a valve chamber 4 with the low-pressure chamber 18. A valve member 19 for opening/closing the introduction passages 22, 23 and the outlet passage 21 is disposed in the low-pressure chamber 18 and is connected to the diaphragm 13. A change-over member 25 is provided, depending upon which position, a bypass passage 24 is controlled, and which permits the communication of the low-pressure chamber 18 to an exit 7, or permits the communication of this chamber 18 to the valve chamber 4.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using equipment and steam piping, and particularly relates to a steam trap that is heated and cooled by steam and condensate and expands according to the temperature. A thermally responsive steam system that uses a temperature control element containing a shrinking medium to discharge condensate below a desired temperature to the outside of the system.
Regarding Mutrap.

0002

2. Description of the Related Art A conventional thermally responsive steam trap will be explained with reference to Japanese Patent Publication No. 60-46318. In this method, a temperature control element containing an expansion medium is arranged in a valve chamber communicating with an inlet, and the expansion and contraction action of the expansion medium drives a valve member connected to the temperature control element and arranged in the valve chamber. The valve seat member is configured to be seated on and off from a valve seat member in which a lead-out passage communicating the valve chamber and the outlet is formed.

[0003] When high-temperature steam flows into the valve chamber, the expansion medium expands and seats the valve member on the valve seat member, closes the outlet passage and prevents the discharge of steam, allowing low-temperature condensate to When the expansion medium flows in, the expansion medium contracts, disengaging the valve member from the valve seat member, opening the introduction passage, and discharging the medium out of the system.

0004

[Problem to be Solved by the Invention] In the above system, when the temperature control element is damaged and the expansion medium flows out, the valve member seats on the valve seat member due to the fluid pressure on the inlet side and closes the outlet path. . If the valve is closed when the temperature control element is damaged, condensate cannot be discharged, so especially when discharging condensate from steam-using equipment, the operating efficiency of steam-using equipment may decrease or defective products may be produced. Problems arise. Therefore, the valve should open in the event of damage. On the other hand, if the valve can be opened when the temperature control element is damaged, the above-mentioned inconvenience can be solved, but steam will leak, which is not preferable from the point of view of energy saving. In particular, if a large number of traps are installed in a steam pipe, etc., the valve should be closed in the event of damage.

[0005] Therefore, the technical problem of the present invention is to make it possible to easily change whether the valve member should be closed or opened in the event of a failure of the temperature control element.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing, and to create a gap between the valve chamber and the outlet. A temperature control element containing an expansion medium is connected to the valve chamber side of the valve seat member to form a low pressure chamber therebetween. A bypass system in which an outlet passage communicating with the outlet is formed in a valve seat member, a valve member for opening and closing the inlet passage and the outlet passage is connected to a temperature control element and placed in a low pressure chamber, and the low pressure chamber is communicated with the valve chamber and the outlet. A passage is formed in the valve seat member, and a switching member is provided for opening and closing the bypass passage to communicate the low pressure chamber with the outlet or the low pressure chamber with the valve chamber.

[0007]

[Operation] The operation of the above technical means is as follows. When the temperature of the fluid entering the valve chamber from the inlet is high, the expansion medium expands and displaces the valve means, closing the inlet passage and preventing the hot fluid or steam from escaping. On the other hand, when cold fluid flows in, the expansion medium contracts, causing the valve means to leave the inlet passage and discharge the cold fluid to the outlet.

When the bypass passage communicates the low pressure chamber and the valve chamber by the switching means, even if the temperature control element is damaged and the expansion medium flows out, the valve member will not be able to contact the valve seat member due to the fluid pressure on the inlet side. Take a seat and close the inlet and outlet passages. On the other hand, if the bypass passage communicates the low pressure chamber and the outlet with the switching means, even if the temperature control element is damaged and the expansion medium flows out,
The low pressure chamber in which the valve member is placed communicates with the outlet via the bypass passage, and the fluid pressure on the inlet side acts on the valve member from the inlet passage in the valve opening direction, so the valve member is separated from the inlet passage and the outlet passage. and open the valve.

[0009]

[Embodiment] An embodiment illustrating a specific example of the above technical means will be described (see FIGS. 1 and 2). An upper casing 1 and a lower casing 2 are fastened together with bolts 3 to form a valve casing having a valve chamber 4 inside. Airtightness between the two casings 1 and 2 is maintained by an annular gasket 5. Inlet 6 to upper casing 1
An outlet 7 is formed in the lower casing 2.

A valve seat member 9 is provided on the partition wall 8 between the valve chamber 4 and the outlet 7.
Connect with screws. Airtightness between the partition wall 8 and the valve seat member 9 is maintained by an annular gasket 10. An annular spacer 11 is attached to the upper surface of the valve seat member 9. The valve seat member 9 and the spacer 11 are fixed by welding their respective outer peripheries (at the location indicated by reference number 12). A wall member 14 is attached to the upper surface of the spacer 11 with a diaphragm 13 in between. The spacer 11, the diaphragm 13, and the wall member 14 are fixed by welding their respective outer peripheries (reference number 15).

An expansion medium 16 is placed in the space between the diaphragm 13 and the wall member 14, and the space is sealed with a steel ball 17. The expansion medium 16 is formed of water, a fluid with a boiling point lower than water, or a mixture thereof. Diaphragm 13 and valve seat member 9
A disk-shaped valve member 19 is placed in a low pressure chamber 18 formed between the two. The plate member 20 placed on the upper surface of the diaphragm 13, the diaphragm 13, and the valve member 19 are connected by welding at their respective centers.

The valve seat member 9 has an outlet passage 21 in its center that communicates the low pressure chamber 18 with the outlet 7. Further, an annular groove 22 is formed around the annular groove 22, and four passages 23 are opened laterally from the annular groove 22, thereby forming an introduction path that communicates the valve chamber 4 and the low pressure chamber 18.

A bypass passage 24 communicating with the outlet 7 and the valve chamber 4 from the outside of the annular groove 22 is formed in the valve seat member 9 . A switching member 25 made of a steel ball is press-fitted into the bypass passage 24. When the switching member 25 is in the position indicated by the solid line, the low pressure chamber 18 and the outlet 7 communicate with each other, and when it is in the position indicated by the dotted line,
The low pressure chamber 18 and the valve chamber 4 communicate with each other. The outer diameter of the lower surface of the valve member 19 is formed larger than the outer diameter of the annular groove 24, and the valve seat member 9
When seated, the introduction passages 22 and 23 are closed. The opening of the bypass passage 24 to the low pressure chamber 18 is located outside the valve member 19 and is not closed by the valve member 19.

When the temperature of the fluid flowing into the valve chamber 4 from the inlet 6 is high, the expansion medium 16 expands and displaces the valve member 19 downwardly through the diaphragm 13 so that the valve member 19 is seated on the valve seat member 9. At least the inlet paths 22 and 23 and the outlet path 2
1 to prevent hot fluid or steam from escaping.

When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 16 contracts, the valve member 19 is separated from the valve seat member 9, the inlet passages 22, 23 and the outlet passage 21 are opened, and the low temperature The fluid, ie, low-temperature condensate, is discharged from the system through the outlet 7.

[0016]

[Effects of the Invention] The present invention produces the following unique effects. As described above, in the present invention, it is possible to select whether the valve member opens or closes when the temperature control element is damaged, so there is no reduction in the operating efficiency of steam-using equipment or the production of defective products. Alternatively, a trap that does not cause steam leakage can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a valve seat member of a thermally responsive steam trap according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the thermally responsive steam trap taken along line A-A in FIG. 1;

[Explanation of symbols]

1 Upper casing 2 Lower casing 4 Valve chamber 6 Entrance 7 Exit 9 Valve seat member 13 Diaphragm 14 Wall members 16 Expansion medium 18 Low pressure chamber 19 Valve member 21 Derivation path 22 Annular groove (introduction path) 23 Passage (introduction path) 24 Bypass passage 25 Switching member

Claims (1)

[Claims] Claim 1: A valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member is disposed between the valve chamber and the outlet, and a temperature control element containing an expansion medium is placed on the valve chamber side of the valve seat member. A valve member that connects to the valve seat member to form a low-pressure chamber therebetween, an inlet passage that communicates the valve chamber and the low-pressure chamber, and an outlet passage that communicates the low-pressure chamber and the outlet, and that opens and closes the inlet passage and the outlet passage. is connected to a temperature control element and arranged in a low pressure chamber, a bypass passage communicating the low pressure chamber with the valve chamber and the outlet is formed in the valve seat member, and the bypass passage is opened and closed to connect the low pressure chamber to the outlet or the low pressure chamber. A heat-responsive steam trap equipped with a switching member that communicates with the valve chamber.