JP2005299744A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam trap allowing a bimetallic strip part to separate a float from a valve seat securely until temperature of the whole main body becomes sufficiently high temperature to exhaust air and drain condensate at low temperature. <P>SOLUTION: In an adjusting plate 4, one end 4b is fixed to an internal wall of the main body 1, and the other end 4c is a free end to adjust coming-into contact and leaving of the float 2 for the valve seat 3 by bending and eccentric position of the bimetallic strip part 4a. The bimetallic strip part 4a has a curved part 4d, which is arranged to pass through the vicinity of a bottom part of the main body 1 and bend in accordance with temperature in the vicinity of the bottom part of the main body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steam trap that separates and discharges condensate condensed with steam from steam.

  As the steam trap, there is known a float type steam trap configured to control the discharge of condensate by contact and separation of the float with respect to the valve seat.

  Such a steam trap generally has a main body having a fluid inlet and outlet, a float accommodated in the main body, a valve connected to the outlet and capable of controlling the discharge of condensate by the contact and separation of the float. And when the condensate stays in the main body for a certain amount or more, the float rises and is separated from the valve seat, and the condensate is discharged from the main body to the outside of the main body.

  However, with only the above configuration, the float remains in contact with the valve seat when there is not enough liquid inside the main body, such as at the start-up when steam starts to be introduced. The problem is that air remains and condensate cannot be discharged. For this reason, in this type of steam trap, a bimetal plate is provided between the float and the valve seat, and whether the float is in contact with or separated from the valve seat is adjusted by bending deflection of the bimetal plate due to temperature changes inside the body. The above-mentioned problem is avoided by providing a valve mechanism, generally called an air vent, which is configured with another valve seat and another valve for controlling opening and closing of the valve seat with a bimetal or the like at a position different from the valve seat.

For example, in Patent Document 1, a bimetal plate is provided between a float housed in a float chamber having a fluid inflow port and a valve seat connected to a discharge port, and this bimetal plate has a U-shaped cross section. A technique of a steam trap is disclosed in which the float is controlled by bending deflection on one non-fixed side of the shape.
Japanese Utility Model Publication No. 48-8742

  However, in the steam trap disclosed in the above-mentioned publication, the bimetal plate is arranged above the valve seat, and is configured to bend according to the temperature of the upper half of the valve body whose temperature rises quickly. At the time of start-up, etc., there is a possibility that air discharge becomes insufficient as a result of the bimetal portion contacting the float to the valve seat before the entire body reaches a sufficiently high temperature.

  The present invention has been made in view of the above problems, and until the entire main body is sufficiently heated, the bimetal portion can reliably separate the float from the valve seat and discharge air or low-temperature condensate. The challenge is to provide a steam trap that can be used.

  The present invention for solving the above problems includes a main body having a fluid inflow port and a discharge port, a float accommodated in the main body, a condensate and a condensate by connecting and separating the float in the main body and connected to the discharge port. A valve seat that discharges non-condensable gas such as air, and a bimetal part that adjusts the contact and separation of the float with respect to this valve seat by bending deflection accompanying the temperature change inside the main body, and separates the float from the valve seat at low temperatures An adjustment plate provided with an adjustment plate, wherein the adjustment plate has one end fixed to the inner wall of the main body and the other end is a free end. This is to adjust the contact and separation of the float with respect to the valve seat, and the bimetal part of the adjusting plate has a curved part, and this curved part is arranged so as to pass near the bottom part of the main body, and near the bottom part of the main body. Depending on the temperature of A steam trap, characterized in that it is configured to tune.

  According to the present invention, the bimetal portion of the adjustment plate bends according to the temperature of the bimetal storage portion provided at the bottom of the main body, and adjusts the contact and separation of the float so that the float is separated from the valve seat at low temperatures. When the main body is at a low temperature, such as during start-up, the float is separated from the valve seat, and the air remaining in the upstream piping and the main body can be discharged from the discharge port.

  In addition, since the bimetal portion of the adjustment plate is configured to bend according to the temperature of the bimetal storage portion provided at the bottom of the main body where the rise in temperature is most delayed, until the entire main body becomes sufficiently hot The bimetal part can reliably separate the float from the valve seat and discharge air and low-temperature condensate.

  In addition, since the curved portion is configured to bend according to the temperature of the bimetal storage portion provided at the bottom of the main body where the rise in temperature is most delayed, it is curved until the entire main body becomes sufficiently hot. The part can more reliably separate the float from the valve seat and discharge air and low-temperature condensate.

  Further, the steam trap according to the present invention is provided with a condensate reservoir for accumulating condensate at the bottom of the main body, and the bimetal portion of the adjusting plate is configured such that all or a part of the curved portion reaches the condensate reservoir. Preferably it is attached.

  In this way, the bimetal part is attached in such a manner that all or part of the curved part reaches the condensate reservoir provided at the bottom of the main body, so that the entire main body and the condensate in the condensate reservoir are sufficiently Until the temperature rises, the curved portion can more reliably separate the float from the valve seat and discharge air and low-temperature condensate.

  The temperature at which the bimetal portion of the adjusting plate separates the float from the valve seat is set to 100 ° C. or less, for example, about 80 ° C., while the steam trap is under a pressure well above atmospheric pressure, and accordingly Since the saturated steam temperature is used at a temperature exceeding 100 ° C., there is no problem that even the high-temperature steam is discharged by the valve opening by the bimetal part.

  As described above, according to the present invention, until the entire valve body becomes sufficiently hot, such as during start-up, the bimetal part reliably separates the float from the valve seat and discharges air and low-temperature condensate. There is a remarkable effect that it can be done.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a configuration of a steam trap 10 according to an embodiment of the present invention, and FIG. 2 is a top view of FIG.

  Referring to FIGS. 1 and 2, the illustrated steam trap 10 according to the embodiment of the present invention is employed to separate and discharge the condensate W condensed from the steam S from the steam S. Yes, the main body 1, the float 2 accommodated in the main body 1, the valve seat 3 capable of controlling the discharge of the condensate W by the contact and separation of the float 2, and the contact and separation of the float 2 with respect to the valve seat 3 are adjusted. And an adjustment plate 4.

  The main body 1 has a structure in which upper and lower split casings 1a and 1b are connected by bolts 1m. The main body 1 has an inlet 1c and an outlet 1d. The inlet 1c and the outlet 1d are internally threaded 1e, 1f is provided and can be connected to other piping parts.

  Further, a condensate reservoir 1n for accumulating the condensate W is provided at the bottom of the main body.

  The float 2 is composed of a stainless steel hollow sphere, and rises and falls according to the water level of the condensate staying in the main body 1. Further, the float 2 is restricted from being displaced upward by a screen 1 g made of a stainless steel porous plate provided in the main body 1.

  The valve seat 3 is a nozzle component that is connected to the discharge port 1d inside the main body 1 and that can control the discharge of the condensate W by the contact and separation of the float 2. The opening 3a contacts the outer surface of the float 2 and discharges the discharge port. It is comprised so that discharge of the condensate W to 1d may be stopped. And this valve seat 3 has the external thread part 3b, and is being fixed to the internal thread 1h provided in the inner wall of the main body 1 connected to the discharge port 1d.

  In this embodiment, the adjustment plate 4 is composed of a bimetal portion 4a made of a bimetal special metal plate joined with dissimilar metals. One end 4b of the adjusting plate 4 is fixed to the inner wall of the main body 1 with screws 1j, and the other end 4c is a free end, and the float 2 is brought into and out of contact with the valve seat 3 by the bending displacement of the bimetal portion 4a. Adjust.

  Further, the bimetal portion 4a of the adjustment plate 4 adjusts the contact / separation of the float 2 with respect to the valve seat 3 by bending deflection accompanying the temperature change inside the main body 1 so that the float 2 is separated from the valve seat 3 at a low temperature. It is composed of. In the present embodiment, the bimetal portion 4a has a curved portion 4d, and the curved portion 4d is provided at the bottom of the main body 1 in such a manner that all or a portion of the curved portion 4d reaches the condensate reservoir 1n. Is disposed in the bimetal storage portion 1k. And this bimetal part 4a bends according to the temperature of the bimetal accommodating part 1k which is the lowest temperature part in accommodation spaces, such as the float of the main body 1, and this bimetal accommodating part 1k makes the float 2 the valve seat 3 at the time of low temperature. It is comprised so that it may space apart from. In addition, the bimetal part 4a does not need to be provided over the whole adjustment board 4, and may comprise a part in the bimetal accommodating part 1k.

  Next, the operation of the steam trap 10 according to the embodiment of the present invention will be described with reference to FIGS. 3 to 8 are explanatory diagrams showing states at each stage from the start-up to the normal operation state, and FIGS. 9 to 12 are once the operation is stopped and the main body 1 is cooled. It is explanatory drawing which shows the state when introducing steam S again and restarting an operation | movement.

  First, referring to FIGS. 3 to 8, the start-up time when the steam S is started to be introduced into the empty main body 1 will be described.

  FIG. 3 is an explanatory diagram showing a state before starting operation. Since the main body 1 is in a low temperature state, the bimetal portion 4 a of the adjustment plate 4 is bent according to the temperature of the bimetal storage portion 1 k provided at the bottom of the main body 1, and separates the float 2 from the valve seat 3. The contact / separation of the float 2 is adjusted as follows.

  FIG. 4 is an explanatory view showing a state in which the low-temperature condensate W preceding the air A and steam S in the upstream pipe flows in and stays at the bottom of the main body 1. The temperature of the bimetal part 4a is low, the float 2 is separated from the valve seat 3, and the air A remaining in the upstream piping and the main body is discharged from the discharge port 1d.

  FIG. 5 shows a state in which the water level of the low-temperature condensate W staying in the main body has risen to the opening 3 a of the valve seat 3. The temperature of the bimetal part 4a is still low, the float 2 is separated from the valve seat 3, and the air A and the low temperature condensate W are discharged | emitted from the discharge port 1d.

  FIG. 6 shows a state in which steam and high-temperature condensate W flow into the main body 1 and the temperature of the bimetal portion 4 a rises and is bent so that the float 2 comes into contact with the valve seat 3. Thereby, discharge of the condensate W stops and the condensate W stays.

  FIG. 7 shows a state in which the float 2 has been lifted as the condensate W stays and thus is separated from the valve seat 3. Thereby, the condensate W staying in the main body 1 starts to be discharged from the discharge port 1d.

  FIG. 8 shows a state where the water level is lowered and the float is lowered as the condensate W is discharged, and is in contact with the valve seat 3. Thereby, the discharge of the condensate W is stopped.

  Next, with reference to FIGS. 9 to 12, a description will be given of a case where the operation is restarted after the operation is stopped once and the main body 1 is cooled.

  FIG. 9 is an explanatory diagram showing a state in which the operation is stopped after the main body 1 is cooled. Condensate W accumulates in the main body 1 and raises the float 2.

  FIG. 10 shows a state in which the low-temperature condensate W preceding the air A and steam S in the upstream pipe flows. The temperature of the bimetal part 4a is low, the float 2 is separated from the valve seat 3, and the low temperature condensate W is discharged | emitted from the discharge port 1d.

  FIG. 11 shows a state in which the water level of the low-temperature condensate W staying in the main body has dropped to the opening 3 a of the valve seat 3. The temperature of the bimetal part 4a is still low, the float 2 is separated from the valve seat 3, and the air A and the low temperature condensate W are discharged | emitted from the discharge port 1d.

  In particular, the rise in temperature of the bimetal storage portion 1k provided at the bottom is slower than the vicinity of the water surface of the condensate W accumulated therein, and the float 2 is not operated until the temperature of the bimetal storage portion 1k rises sufficiently. The state separated from the seat 3 is maintained.

  When steam and high-temperature condensate W flow into the main body 1 and the temperature of the bimetal storage portion 1k rises, the bimetal portion 4a reacts and the float 2 is applied to the valve seat 3 as shown in FIG. It will be in the state bent so that it may contact. Thereby, discharge of the condensate W stops and the condensate W stays.

  Thereafter, as shown in FIGS. 6 to 8 described above, the discharge of the condensate W is controlled by the operation of the float 2 according to the water level.

  As described above, according to the steam trap 10 according to the embodiment of the present invention, the bimetal portion 4a of the adjustment plate 4 bends according to the temperature of the bimetal storage portion 1k provided at the bottom of the main body 1. Since the float 2 is adjusted so that the float 2 is separated from the valve seat 3 at a low temperature, the float 2 is separated from the valve seat 3 when the main body 1 is at a low temperature such as at start-up, and the upstream piping and main body 1 can be discharged from the discharge port 1d.

  Further, since the bimetal portion 4a of the adjustment plate 4 is configured to bend according to the temperature of the bimetal storage portion 1k provided at the bottom of the main body 1 where the rise in temperature is most delayed, the entire main body 1 is sufficient. Until the temperature becomes high, the bimetal part 4a can reliably separate the float 2 from the valve seat 3 and discharge the air A and the low-temperature condensate W.

  Further, according to the steam trap 10, the curved portion 4d of the bimetal portion 4a of the adjustment plate 4 is disposed in the bimetal storage portion 1k provided at the bottom of the main body 1, and is provided at the bottom of the main body 1 where the temperature rise is most delayed. Since the curved portion 4d is configured to bend according to the temperature of the bimetal storage portion 1k, the curved portion 4d more reliably controls the float 2 until the entire body 1 is sufficiently heated. The air A and the low-temperature condensate W can be discharged away from the seat 3.

  Moreover, according to the steam trap 10, since the bimetal part 4a is attached in such a manner that all or a part of the curved part 4d reaches the condensate reservoir 1n provided at the bottom of the main body, the main body 1 and the condensate reservoir are attached. Until the condensate W in 1n reaches a sufficiently high temperature, the curved portion 4d further reliably separates the float 2 from the valve seat 3 and discharges the air A and the low-temperature condensate W.

  The above-described embodiment is merely a preferred specific example of the present invention, and the present invention is not limited to the above-described embodiment.

  For example, the design of the material of the main body 1, the float 2, the valve seat 3, the adjustment plate 4 and the like can be variously changed.

  In addition, it goes without saying that various design changes are possible within the scope of the claims of the present invention.

It is a sectional side view which shows the structure of the steam trap which concerns on embodiment of this invention. FIG. 2 is a top view of FIG. 1. It is explanatory drawing which shows the state before it starts introducing steam | vapor. It is explanatory drawing which shows the state which the low temperature condensate preceded the air and steam of an upstream piping flows in, and is staying in the bottom part of a main body. It is explanatory drawing which shows the state which the water level of the low temperature condensate staying in the main body rose to the opening part of the valve seat. It is explanatory drawing which showed the state bent so that a vapor | steam and high temperature condensate flowed into a main body, the temperature of a bimetal part rose, and a float was made to contact | abut to a valve seat. It is explanatory drawing which showed the state spaced apart from the valve seat because the float rose with the stay of condensate. It is explanatory drawing which shows the state which the water level fell and the float fell and contact | abutted to the valve seat. It is explanatory drawing which shows the state under operation stop after a main body is cooled. It is explanatory drawing which showed the state into which the low temperature condensate preceded the air and steam of upstream piping inflow. The state where the water level of the low-temperature condensate staying in the body is lowered to the opening of the valve seat is shown. It is explanatory drawing which showed the state bent so that a vapor | steam and the high temperature condensate W flowed into a main body, the temperature of a bimetal part rose, and a float was made to contact | abut to a valve seat.

Explanation of symbols

A Air (fluid)
W Condensate (fluid)
DESCRIPTION OF SYMBOLS 1 Main body 1c Inflow port 1d Discharge port 1k Bimetal storage part 1n provided in the bottom part Condensate reservoir 2 Float 3 Valve seat 4 Adjustment plate 4a Bimetal part 4b One end 4c of an adjustment plate 4d Other end 4d Curved part 10 of an adjustment plate

Claims (2)

A main body having a fluid inlet and outlet, a float accommodated in the main body, and a valve that is connected to the outlet inside the main body and discharges noncondensable gases such as condensate and air by contacting and separating the float And an adjustment plate provided with a bimetal portion that adjusts the contact and separation of the float with respect to the valve seat by bending deflection accompanying a temperature change inside the main body and separates the float from the valve seat at a low temperature. A steam trap,
The adjustment plate has one end fixed to the inner wall of the main body and the other end is a free end, and adjusts the contact and separation of the float with respect to the valve seat by bending deflection of the bimetal part.
The bimetal portion of the adjusting plate has a curved portion, and the curved portion is disposed so as to pass near the bottom portion of the main body, and is configured to bend according to the temperature near the bottom portion of the main body. A steam trap characterized by that.   A condensate reservoir for accumulating condensate is provided at the bottom of the main body, and the bimetal portion of the adjustment plate is attached in such a manner that all or part of the curved portion reaches the condensate reservoir. Item 4. The steam trap according to item 1.

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