JP2010185556A - Thermoresponsive steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoresponsive steam trap capable of rapidly ejecting a condense each time when the condense flows in a valve chest, after ejecting a low temperature condense in early ventilation. <P>SOLUTION: The valve casing comprised of a body 1 and a lid 2 is formed with an inlet, a valve chest and an outlet. A valve seat member 9 through which a deviation path 8 communicating with the valve chest 4 and the outlet 7 is opened is provided between the valve chest 4 and the outlet 7. A temperature control element 11 which comprises a wall member 14, a diaphragm member 15, an expansion medium 16 encapsulated between both members 14 and 15 and a valve member 17 attached on the side of the valve seat member 9 of the diaphragm member 15 and through which a communication path 18 penetrating the wall member 14, the diaphragm member 15 and the valve member 17 is opened is disposed in the valve chest 4. The opening area of the communication path 18 of the temperature control element 11 is formed in a smaller size than the opening area of the deviation path 8 of the valve seat member 9. A float 19 is disposed in the valve chest 4, whereby the communication path 18 of the temperature control element 11 is open and closed depending on the displacement due to the floating and falling of the float 19. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, a temperature controller including a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature. The present invention relates to a thermally responsive steam trap that discharges condensate below a set temperature using element.

  A conventional thermally responsive steam trap is disclosed in Patent Document 1, for example. This is because the valve seat is formed between the valve chamber and the outlet by forming the inlet, the valve chamber, and the outlet in the valve casing, and the outlet passage communicating the valve chamber and the outlet is opened. A temperature control element having an expansion medium enclosed in between and a valve member attached to the valve seat member side of the diaphragm member and having a wall member, a diaphragm member and a communication passage penetrating the valve member disposed in the valve chamber; The valve member is driven by the displacement of the diaphragm member due to the expansion and contraction of the expansion medium to open and close the lead-out path of the valve seat member.

JP-A-9-26092

  The above-mentioned conventional thermally responsive steam trap prevents the leakage of steam by expanding the expansion medium when the temperature in the valve chamber rises, and the valve member is seated on the valve seat member via the diaphragm member to close the outlet passage. When the temperature in the valve chamber decreases, the expansion medium contracts and the valve member separates from the valve seat member and opens the outlet passage, thereby discharging the condensate out of the system. It can drain water quickly. However, in such a heat-responsive steam trap, the temperature drop of the condensate in the valve chamber is delayed from the temperature drop of the condensate in the upstream piping system after the discharge of the low-temperature condensate at the beginning of the ventilation. In addition, the valve closing operation is delayed, and there is a problem that condensate having a temperature lower than the set temperature to be discharged to the upstream piping system is retained.

  Therefore, the problem to be solved by the present invention is to provide a thermally responsive steam trap capable of quickly discharging condensate whenever condensate flows into the valve chamber after discharging low temperature condensate at the beginning of aeration.

  In order to solve the above-described problems, the thermally responsive steam trap of the present invention is configured such that a valve seat includes a valve casing formed with an inlet, a valve chamber, and an outlet, and a lead-out passage communicating the valve chamber and the outlet is opened. A wall member, a diaphragm member, an expansion medium enclosed between the two members, and a valve member attached to the valve seat member side of the diaphragm member, and penetrates the wall member, the diaphragm member, and the valve member. A temperature control element having an open communication path is arranged in the valve chamber, and the valve member is driven by the displacement of the diaphragm member due to expansion and contraction of the expansion medium to open and close the lead-out path of the valve seat member. The opening area of the communication passage is formed to be smaller than the opening area of the outlet passage of the valve seat member, the float is arranged in the valve chamber, and the communication path of the temperature control element is opened and closed by displacement due to the float rise and fall With what That.

  According to the present invention, the opening area of the communication passage of the temperature control element is formed to have a smaller diameter than the opening area of the outlet passage of the valve seat member, the float is disposed in the valve chamber, and the temperature is controlled by the displacement due to the float drop. Since the communication passage of the element is opened and closed, after discharging the low-temperature condensate at the beginning of ventilation, the float rises and falls every time the condensate flows into the valve chamber, thereby opening and closing the communication passage of the temperature control element. The condensate can be discharged quickly.

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. A lid 2 is fastened to the main body 1 with bolts 3 to form a valve casing, and a valve chamber 4 is formed inside. The main body 1 has an inlet 5, an outlet passage 6 and an outlet 7, and the inlet 5 communicates with the upper portion of the valve chamber 4. The inlet 5 and the outlet 7 are formed on the same axis in the horizontal direction. A valve seat member 9 having a lead-out path 8 is screwed to the main body 1 below the valve chamber 4. The lower part of the valve chamber 4 communicates with the outlet 7 from the outlet path 8 through the outlet passage 6. A temperature control element 11 is attached by a snap ring 12 in a cylindrical attachment member 10 fixed between the valve seat member 9 and the main body 1. The attachment member 10 is provided with a plurality of communication holes 13 that communicate with the inside and outside.

The temperature control element 11 includes a wall member 14, a diaphragm member 15, an expansion medium 16 enclosed between the members 14 and 15, and a valve member 17 attached to the diaphragm member 15 on the valve seat member 9 side. 14, a communication passage 18 that penetrates through the diaphragm member 15 and the valve member 17 is opened. The communication passage 18 is formed by welding the diaphragm member 15 and the valve member 17 side by side with their central openings, and welding the edge of the central opening of the wall member 14 and the edge of the central opening of the diaphragm member 15. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof. The opening area of the communication passage 18 of the temperature control element 11 is formed to be smaller in diameter than the opening area of the outlet path 8 of the valve seat member 9. The valve member 17 is driven by the displacement of the diaphragm member 15 due to the expansion and contraction of the expansion medium 16 to open and close the lead-out path 8 of the valve seat member 9. A hollow spherical float 19 that rises and falls according to the liquid level in the valve chamber 4 and is seated on the wall member 14 of the temperature control element 11 to open and close the communication passage 18 is disposed in the valve chamber 4 in a free state. A float seat 20 with which the float 19 abuts at a position where the communication path 18 is closed is provided below the float 19.

  The operation of the above-mentioned heat-responsive steam trap is as follows. When the temperature in the valve chamber 4 at the beginning of ventilation is low, the expansion medium 16 contracts, the diaphragm member 15 is displaced to the left, the valve member 17 is separated from the valve seat member 9, and the outlet path 8 is opened. As a result, the low-temperature condensate flowing into the valve chamber 4 is discharged from the outlet path 8 to the outlet 5. When the temperature in the valve chamber 4 rises, the expansion medium 16 expands, the diaphragm member 15 is displaced to the right, the valve member 17 is seated on the valve seat member 9, and the outlet path 8 is closed.

  After the valve member 17 is seated on the valve seat member 9 and the outlet passage 8 is closed, the float 19 that rises and falls according to the liquid level in the valve chamber 4 is seated on the wall member 14 of the temperature control element 11. The communication path 18 is opened and closed. When the communication path 18 is opened, the high-temperature condensate flowing into the valve chamber 4 is discharged from the communication path 18 to the outlet 5, and when the communication path 18 is closed, leakage of steam flowing into the valve chamber 4 is prevented. Since the float 19 rises quickly each time condensate flows into the valve chamber 4 and opens the communication path 18, the condensate can be discharged quickly even if the opening area of the communication path 18 has a small diameter.

  INDUSTRIAL APPLICABILITY The present invention can be used for a thermally responsive steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes using a temperature control element.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 7 Outlet 8 Outlet path 9 Valve seat member 11 Temperature control element 14 Wall member 15 Diaphragm member 16 Expansion medium 17 Valve member 18 Communication path 19 Float

Claims (1)

  The valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member that opens a lead-out path that connects the valve chamber and the outlet is provided between the valve chamber and the outlet, and is enclosed between the wall member, the diaphragm member, and both members. A temperature control element having a wall member, a diaphragm member, and a communication passage penetrating the valve member is disposed in the valve chamber. The valve member is driven by the displacement of the diaphragm member due to expansion and contraction to open and close the lead-out path of the valve seat member, and the opening area of the communication path of the temperature control element is made smaller than the opening area of the lead-out path of the valve seat member A thermally responsive steam trap, which is formed and has a float disposed in a valve chamber, and opens and closes the communication path of the temperature control element by a displacement caused by the float drop.

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