JPH102488A - Thermally actuated steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam trap that can prevent leakage of steam without damaging diaphragms. SOLUTION: An inlet 1 and an outlet 2 are formed at a body 3. Valve chambers 6, 22 are formed by the body 3 and covers 4, 20, and diaphragms 9, 25 of corrugated disc shape are fitted thereto. Thermal expansion media 10, 26 are filled between the diaphragms 9, 25 and the covers 4, 20. Protruding parts 11, 27 serving as a valve seat part are provided at opposed center parts of the diaphragms 9, 25. When the thermal expansion media 10, 26 are expanded, the diaphragms 9, 25 are displaced and brought into contact with only the protruding parts 11, 27 to prevent leakage of steam.

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 only condensate, which is condensed water of steam generated in various steam-using equipment and steam pipes, and more particularly to a steam trap which flows into a valve chamber. The present invention relates to a thermo-responsive steam trap having a temperature-sensitive responsive element that is heated or cooled by the above-described method and deforms in accordance with the temperature thereof, and discharges only condensate having a desired temperature or less to the outside of the system.

[0002]

2. Description of the Related Art A conventional heat-responsive steam trap will be described with reference to Japanese Patent Publication No. 6-68252. this is,
A thermal expansion element is used as a temperature-sensitive element. An inlet, a valve chamber, and an outlet are formed by valve casing, the inlet and the valve chamber communicate with each other through an introduction path, and the valve chamber and the outlet are connected through a valve seat. A diaphragm in which a thermal expansion medium is sealed is disposed opposite to a valve seat portion and an introduction path, and the diaphragm is driven by the expansion and contraction action of the thermal expansion medium so as to cut off the communication between the inlet and the outlet. It is. As the thermal expansion medium, a mixture with water or a liquid having a boiling point lower than that of water is used.

[0003]

In the above-mentioned conventional heat-responsive steam trap, since the diaphragm is disposed so as to face the introduction path and the valve port of the valve seat portion, the diaphragm is disposed in the introduction path and the valve port. There was a problem that the diaphragm was damaged at the edge. If the diaphragm is damaged, the thermal expansion medium flows out, and the diaphragm is not driven in accordance with the temperature, and cannot function as a steam trap.

Further, in the above-mentioned conventional apparatus, foreign matter such as rust or dust in the fluid stays at the end of the introduction path or the valve port, and the fluid is reliably sealed even when the diaphragm is driven. And there was a problem of leaking steam. At the end of the introduction passage on the valve chamber side or near the valve opening of the valve seat, foreign matters such as rust and scale in the fluid tend to stay due to a large change in the flow direction and flow velocity of the fluid.

[0005] It is therefore an object of the present invention to prevent the diaphragm from being damaged at the edge portion and to prevent the vapor from leaking due to the stagnation of foreign matter.

[0006]

In order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems by providing an inlet, a valve chamber, and an outlet by valve casing, and having a diaphragm in the valve chamber and an outer periphery of the diaphragm. A valve is fixedly attached to a casing, a thermal expansion medium is sealed in the diaphragm, and an inlet and an outlet are communicated with each other by expansion and contraction of the thermal expansion medium. An introduction path that communicates the valve chamber and an outlet path that communicates the plurality of valve chambers and the outlet are provided, and a plurality of diaphragms are arranged at the valve chamber side ends of the introduction path and the outlet path without abutting on the introduction path. A plurality of valve seats for partitioning the passage and the lead-out passage are arranged in the respective valve chambers, and the respective diaphragms contact only the plurality of valve seats to shut off the inlet and the outlet.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The thermal expansion medium enclosed in each diaphragm expands when the condensate flowing in from the inlet is higher than a predetermined temperature, and comes into contact with a valve seat section that separates the introduction path and the exit path. By shutting off the inlet and outlet to prevent the discharge of steam together with the high-temperature condensate, the condensate shrinks when the temperature of the condensate drops by a predetermined temperature, the contact with the valve seat is released, and the low-temperature condensate is discharged from the outlet. Discharge to the outside.

[0008] By arranging the plurality of diaphragms so as to abut only the respective valve seats without contacting the valve chamber side ends of the introduction path and the outflow path, the edge of the introduction path and the outflow path can be provided. The diaphragm is not damaged, the sealing property is not reduced due to the foreign matter staying, and the steam is not leaked.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a valve body is formed by fastening a body 3 having an inlet 1 and an outlet 2 and lids 4, 20 with bolts 5, 21.
Configure the thing. A valve chamber 6 is provided between the lid 4 and the main body 3,
A valve chamber 22 is formed between the valve body 0 and the main body 3, and communicates with the inlet 1 via introduction paths 7 and 23, respectively, and communicates with the outlet 2 via outlet paths 8 and 24, respectively.

A disk corrugated diaphragm 9 is mounted in the valve chamber 6 with its outer peripheral portion sandwiched between the main body 3 and the lid 4, and a disk corrugated diaphragm 2 is mounted in the valve chamber 22.
5 is sandwiched between the main body 3 and the lid 20 and attached. In the space between the upper part of the diaphragm 9 and the lid 4 and in the space between the lower part of the diaphragm 25 and the lid 20, thermal expansion media 10, 26 are provided.
Is enclosed.

At the center of the main body 3, the respective valve chambers 6, 22
Are provided with gently sloped projections 11 and 27 at the center of the.
The projections 11 and 27 as valve seats are orthogonal to the central axes of the introduction paths 7 and 23 and the exit paths 8 and 24 so as to partition the introduction paths 7 and 23 and the exit paths 8 and 24. 25
Formed along the diameter of The end portion 12 of the introduction passage 7 on the valve chamber 6 side and the end portion 13 of the outlet passage 8 on the valve chamber 6 side are respectively descended substantially at right angles to be connected to the convex portion 11. Portion 28 and End 29 of Valve Guide 22 on Outlet Channel 24
Are raised substantially at right angles to each other and connected to the protruding portions 27, so that even if the diaphragms 9 and 25 are displaced toward the protruding portions 11 and 27, the surfaces of the diaphragms 9 and 25 are moved to the end portions 12 and 1 respectively.
Avoid contact with 3, 28, 29.

The state shown in FIG.
Is contracted, the diaphragms 9 and 25 are separated from the convex portions 11 and 27, and the introduction paths 7, 23 and the extraction paths 8, 24, that is, the entrance 1
And a state in which the outlet 2 is communicated without being partitioned. Therefore, the low-temperature condensate flowing from the inlet 1 connected to a steam-using device or a steam pipe (not shown) is applied to the diaphragms 9 and 25.
And flows between the convex portions 11 and 27 and is discharged from the outlet 2 to the outside.

When the low-temperature condensate is discharged and the high-temperature condensate flows into the valve chambers 6 and 22, the thermal expansion media 10 and 26 expand and the diaphragms 9 and 25 are displaced to displace the projections 11 and 22, respectively. 27
Abutment with the introduction paths 7 and 23 and the exit paths 8 and 2
The section 4 is divided so that the fluid does not flow down to the outlet paths 8 and 24, so that high-temperature condensate and discharge of steam to the outside are prevented.

When the diaphragms 9 and 25 come into contact with the projections 11 and 27, the surfaces of the diaphragms 9 and 25 are connected to the ends 12 and 28 of the introduction paths 7 and 23 and the ends 1 and 28 of the extraction paths 8 and 24.
There is no contact with 3,29 and therefore no damage at their edges. In addition, diaphragms 9 and 2
5 are formed with a gentle slope, and the flow direction and flow velocity of the condensate do not change significantly, so that foreign substances such as rust, dust, scale, etc., stay there. And therefore the surfaces of the diaphragms 9 and 25 and the projection 1
Seals 1 and 27 are secure and do not leak steam to the outside.

In the present embodiment, the inlet 1 and the outlet 2 have been described, but the inlet and the outlet can be reversed.

In this embodiment, the thermal expansion medium 1
Although 0 and 26 have been described as having the same composition,
Thermal expansion media of different compositions can also be used. For example, the lower thermal expansion medium 26 may be a liquid that evaporates at a temperature 5 ° C. lower than the saturation temperature of the used steam pressure, and the upper thermal expansion medium 10 may be 10 ° C. than the saturated temperature of the used steam pressure.
By making the liquid evaporate only at a low temperature, the relatively high temperature condensate near the saturation temperature is discharged through the lower inlet channel 23, the diaphragm 25 and the outlet channel 24, and the lower temperature condensate is considerably lower than the saturation temperature. Can be discharged through the upper introduction path 7, the diaphragm 9, and the extraction path 8 only when the inflow has occurred. Thus, by changing the composition of the thermal expansion medium, the temperature of the condensed water to be discharged can be appropriately changed.

[0017]

As described above, in the present invention, the plurality of diaphragms are arranged so as to abut only the corresponding valve seats without abutting on the valve chamber side ends of the introduction path and the derivation path. Accordingly, it is possible to prevent the diaphragm from being damaged at the edge of the introduction path or the exit path, and to prevent the vapor from leaking due to the stagnation of foreign matter.

Also, in the present invention, by disposing a plurality of diaphragms and valve seats, a larger amount of condensate can be quickly discharged as compared with a case where only a pair of diaphragms and valve seats are disposed. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a thermally responsive steam trap of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 6,22 Valve room 7,23 Introducing route 8,24 Outgoing route 9,25 Diaphragm 10,26 Thermal expansion medium 11,27 Convex part

Claims (1)

[Claims] An inlet, a valve chamber, and an outlet are formed by valve casing, a diaphragm is fixedly mounted on the valve casing at its outer periphery, and a thermal expansion medium is sealed in the diaphragm. In the one that shuts off the communication between the inlet and the outlet by expansion and contraction of the thermal expansion medium, a plurality of valve chambers are provided,
Providing an introduction path communicating the inlet and the plurality of valve chambers, and an outlet path communicating the plurality of valve chambers and the outlet, and disposing the plurality of diaphragms at the valve chamber side ends of the introduction path and the outlet path without abutting. In addition, a plurality of valve seats partitioning the introduction path and the outlet path are arranged in the respective valve chambers, and the inlet and the outlet are shut off by the respective diaphragms abutting only on the plurality of valve seats. A thermo-responsive steam trap characterized by the following.