JP5643558B2 - Thermally responsive steam trap - Google Patents

Description

The present invention uses a temperature control element including a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature, and automatically discharges condensate generated in various steam-using devices and steam pipes. The present invention relates to a responsive steam trap, and more particularly to a heat responsive steam trap that can discharge a large amount of condensate.

A conventional thermally responsive steam trap is disclosed in Patent Document 1, for example. This forms an inlet in the valve casing, a valve chamber communicating with the inlet, an outlet communicating with the valve chamber via the first outlet passage and the second outlet passage, and a first diaphragm sensitive to pressure changes and A temperature control element in which an expansion medium is sealed in an internal space between a second diaphragm that is insensitive to pressure changes is disposed between the first lead-out path and the second lead-out path, and the first diaphragm is caused by expansion and contraction of the expansion medium. The first derivation path and the second derivation path are opened and closed by the displacement of the second diaphragm.

JP-A-8-247390

In the conventional thermoresponsive steam trap, when a high-temperature fluid having a predetermined temperature or more flows into the valve chamber, the expansion medium expands, the first diaphragm first closes the first lead-out path, and then the second diaphragm 2 When the lead-out path is closed and a low-temperature fluid having a predetermined temperature or less flows in, the expansion medium contracts, the first diaphragm opens the first lead-out path, and then the second diaphragm opens the second lead-out path. As a result, the first lead-out path and the second lead-out path are opened and closed by the temperature control element, so that the discharge capacity can be increased and a large amount of condensate can be discharged. When the internal pressure of the space decreases, if only the first diaphragm that opens the first lead-out path is further displaced in the valve opening direction and the second diaphragm cannot open the second lead-out path, a large amount of condensate cannot be discharged. problem There was.

Therefore, the problem to be solved by the present invention is to provide a thermally responsive steam trap in which the first diaphragm and the second diaphragm can reliably open the first lead-out path and the second lead-out path, respectively.

In order to solve the above-mentioned problems, the thermally responsive steam trap of the present invention communicates with the valve chamber via the inlet through the valve casing, the valve chamber communicating with the inlet, the first outlet passage and the second outlet passage. An expansion medium is sealed in an internal space between a first diaphragm that is sensitive to pressure changes and a second diaphragm that is insensitive to pressure changes, and the first diaphragm and the second diaphragm opening the first lead-out path A temperature control element provided with a stopper member in an internal space between the first diaphragm and the second diaphragm for restricting the displacement of the second diaphragm that opens the second lead-out path beyond a predetermined amount in the valve opening direction; The first lead-out path and the second lead-out path are opened and closed by the displacement of the first diaphragm and the second diaphragm due to the expansion and contraction of the expansion medium.

According to the present invention, the first diaphragm and the second diaphragm are stopper members for restricting a predetermined displacement or more in the valve opening direction of the first diaphragm that opens the first lead-out path and the second diaphragm that opens the second lead-out path. Therefore, it is possible to prevent only one of the diaphragms opening one of the outlet passages from being further displaced in the valve opening direction, and the first diaphragm and the second diaphragm are surely each of the first diaphragm and the first diaphragm. There is an effect that the lead-out path and the second lead-out path can be opened.

It is sectional drawing of the thermally responsive steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The main body 1 and the end member 2 are connected with 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 an outlet 5 coaxial with the inlet 4 is formed in the main body 1. The inlet 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 lead-out path 8 and a second valve seat member 11 having a second lead-out path 10 opened are coaxially screwed to a partition wall between the valve chamber 3 and the outlet 5. ing. The valve chamber 3 communicates with the outlet 5 from the first and second lead-out paths 8 and 10 through the outside of the partition wall.

A temperature control element 12 is disposed 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 has a stopper member 21 having an opening in the center between the first and second diaphragms 14 and 15 to fix the outer peripheral edges thereof, and the first and second diaphragms 14 and 15. The expansion medium 16 is sealed in the internal space formed between the two. The first diaphragm 14 is formed thinner than the second diaphragm 15 so as to be more sensitive to pressure changes. The first diaphragm 14 and the second diaphragm 15 can be made to have different responsiveness to pressure changes by changing the presence or absence of ripples and the shape of the ripples or by using materials having different elasticity. The stopper member 21 restricts a predetermined displacement or more in the valve opening direction of the first diaphragm 14 opening the first lead-out path 8 and the second diaphragm 15 opening the second lead-out path 10. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. Valve members 17 and 18 for opening and closing the first and second lead-out paths 8 and 10 are fixed to the first and second diaphragms 14 and 15 at the centers, respectively. The outer peripheral edges of the wall members 19 and 20 having an opening through which the valve members 17 and 18 enter and exit are fixed to the outer peripheral edges of the first and second diaphragms 14 and 15.

The operation of the heat-responsive steam trap is as follows. When the temperature of the fluid flowing into the valve chamber 3 is high, the expansion medium 16 enclosed in the internal space between the first and second diaphragms 14 and 15 expands to increase the internal pressure of the internal space. The first diaphragm 14 is displaced toward the first valve seat member 9 and the first outlet path 8 is closed by the valve member 17, and then the second diaphragm 15 is displaced toward the second valve seat member 11 and the valve member 18. Then the second lead-out path 10 is closed.

When the temperature in the valve chamber 3 decreases due to heat dissipation or the like, 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. First, the first diaphragm 14 However, the valve member 17 opens away from the first valve seat member 9 and opens the first outlet passage 8, and then the second diaphragm 15 moves away from the second valve seat member 11 and the valve member 18 opens the second outlet passage 10.

The present invention uses a temperature control element including a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature, and automatically discharges condensate generated in various steam-using devices and steam pipes. Can be used for responsive steam traps.

DESCRIPTION OF SYMBOLS 1 Main body 2 End member 3 Valve chamber 4 Inlet 5 Outlet 8 1st outlet path 10 2nd outlet path 12 Temperature control element 14 1st diaphragm 15 2nd diaphragm 16 Expansion medium 21 Stopper member

Claims (1)

An inlet in the valve housing, a valve chamber communicating with the inlet, through the first outlet passage and the second outlet passage and an outlet communicating with said valve chamber, the first diaphragm and pressure sensitive to pressure changes The same expansion medium is enclosed in the entire inner space between the second diaphragms which is insensitive to changes, and has an opening that communicates the first diaphragm side and the second diaphragm side of the inner space . wherein the first diaphragm and the second outlet passage said stopper member for regulating a predetermined further displacement of the opening the said second diaphragm of each of the valve opening direction of the first diaphragm and the second diaphragm 1 outlet passage opened wherein the temperature controller element provided in the internal space is disposed between the first outlet passage and the second outlet passage, the first diaphragm due to deflation of the inflation medium and the second between the The thermally responsive type steam trap which is characterized in that so as to open and close the first outlet passage and the second outlet passage by the displacement of Iyafuramu.

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