KR20170041095A

KR20170041095A - Steam trap

Info

Publication number: KR20170041095A
Application number: KR1020150140621A
Authority: KR
Inventors: 백철현
Original assignee: 백철현
Priority date: 2015-10-06
Filing date: 2015-10-06
Publication date: 2017-04-14

Abstract

The present invention relates to a steam trap, and more particularly, to an orifice type steam trap capable of smoothly discharging condensed water generated in a steam transfer pipe such as a heat exchanger using steam.
The steam trap according to the present invention comprises: a hollow case having an inlet port through which condensed water flows into the interior and a duct with an outlet port to the outside; A valve body installed in a pipeline of the case to open and close a pipeline of the case; A plurality of orifices formed in the casing so as to discharge the condensed water introduced into the casing to the outside of the casing; And a shape memory alloy spring installed in the case to linearly reciprocate the valve body along a duct of the case, wherein when the shape memory alloy spring expands, the head portion of the valve body closes the outlet, When the shape memory alloy spring is contracted, the head portion of the valve body opens the discharge port.

Description

Steam Trap {STEAM TRAP}

The present invention relates to a steam trap, and more particularly, to an orifice type steam trap capable of smoothly discharging condensed water generated in a steam transfer pipe such as a heat exchanger using steam.

Generally, condensation water is generated in the transfer pipe due to temperature difference between the inside and the outside of the transfer pipe due to the high temperature and high pressure steam in the steam transfer pipe such as the production facility or the heat exchanger using steam (steam). Such condensate must be removed from time to time as it may cause water hammer or piping corrosion which can generate a lot of noise by striking the steam transfer pipe during steam transfer. At this time, since the heat efficiency is lowered when the steam is discharged together, an apparatus for selectively discharging only the condensed water is required, and a steam trap is installed in the steam transfer pipe in order to remove condensed water.

The steam trap automatically discharges only the condensate from the steam transfer piping, and it is provided in various ways such as ball float, disk type, bimetal type, bucket type, orifice type.

Ball float type steam trap discharges condensate by using density difference of steam and condensate. It is suitable for application of process equipment due to continuous discharging of condensed water, and it is advantageous not to be influenced by sudden fluctuations of pressure and flow rate. However, There is a disadvantage that different internal parts must be used depending on the working pressure.

The disk type steam trap belongs to a thermodynamic type in operation and discharges condensed water by opening and closing a disc valve (disc valve). The disc valve is operated only by one disc valve, The pressure drop in the pressure chamber due to the difference in the thermodynamic characteristics of the steam and the condensed water opens the valve to discharge the condensed water. The disc-type steam trap may be an air cooling type, a steam jacket type, an air jacket type, or the like, depending on the method of reducing the pressure in the transformer chamber.

The bimetallic steam trap belongs to a thermostatic type steam trap operated by a bimetal (bimetallic) as a sensing body and is used for the expansion shrinkage due to temperature changes of steam (high temperature) and condensate (low temperature) To discharge the condensed water by opening and closing the valve. Bimetallic steam traps are widely used as heat sink traps for heat sinks or steam heaters, as well as general purpose applications.

The bucket type steam trap is a float that uses an open water float (bucket). When the condensate reaches a certain amount, the bucket loses its buoyancy and falls, opening the valve, discharging the condensed water by the steam pressure, And when the amount of condensed water in the bucket is reduced, the buoyancy is increased again to close the valve, and the condensed water is discharged by the on-off operation. The difference in specific gravity between the condensed water and steam is used as the steam trap. Bucket-type steam traps include an upstream bucket-type steam trap with an upstream bucket and a downstream bucket-type steam trap using a downstream bucket.

The orifice type steam trap is constructed to prevent the leakage of steam when the discharged condensed water keeps occupying the orifice hole. Such orifice type steam traps are minimally reduced in leakage of steam, and there is no need to separately provide a steam trap and an operation part for removing condensed water, and is most widely used because it has a small heat generating area and a high heat transfer rate with respect to a heating body.

FIG. 1 is a view showing a use state of a general orifice steam trap.

In general, the orifice steam trap is installed on the steam transfer pipe 1 or the like as shown in FIG. 1, and discharges the condensed water generated from the steam by the low temperature outside air temperature. At this time, since the steam should not be leaked out, the orifice steam trap is installed in the branch pipe 2 branching from the steam transfer pipe 1, so that steam can be shut off and only the condensed water can be discharged, thereby improving energy efficiency.

Such a conventional orifice steam trap includes a spring for elastically supporting one side of the orifice unit in the body portion and a shape memory alloy member for elastically supporting the other side of the orifice unit in a direction opposite to the elastic support direction of the spring in the body portion. Wherein the spring and the shape memory alloy spring are provided on the same central axis with the orifice unit interposed therebetween.

However, in the conventional orifice steam traps as described above, the spring and the shape memory alloy spring are installed to elastically support the orifice unit in opposite directions. If the shape memory alloy spring is aged and the elastic force is lowered, There is a problem that the function can not be exerted.

Further, the conventional orifice steam traps have a problem in that fine particles such as scale existing in the condensed water are accumulated in the vicinity of the orifice holes or the condensed water discharge flow passage, the orifice holes are clogged or the flow passage is narrowed and the condensed water is not smoothly discharged.

KR 10-2010-0047438 A (2010.05.10.)

The present invention has been devised to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a steam trap capable of smoothly discharging condensed water generated in a steam transfer pipe such as a heat exchanger using steam have.

It is another object of the present invention to provide a steam trap which prevents particles such as scale existing in condensed water from accumulating in the periphery of the orifice hole or the condensate discharge passage, thereby preventing the orifice hole from being clogged or narrowing the flow passage.

It is still another object of the present invention to provide a steam trap capable of exhibiting a function of a steam trap even when the shape memory alloy spring is aged and the elastic force is lowered.

It is still another object of the present invention to provide a steam trap that is easy to manufacture and convenient for maintenance and management by making the piping through which the condensed water is discharged not to be complicated.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a vacuum cleaner comprising: a hollow case having an inlet port through which condensed water flows into the interior and a duct with an outlet port to the outside; A valve body installed in a pipeline of the case to open and close a pipeline of the case; A plurality of orifices formed in the casing so as to discharge the condensed water introduced into the casing to the outside of the casing; And a shape memory alloy spring installed in the case to linearly reciprocate the valve body along a duct of the case, wherein when the shape memory alloy spring expands, the head portion of the valve body closes the outlet, When the shape memory alloy spring is contracted, the head portion of the valve body opens the discharge port.

Preferably, the shape memory alloy spring is installed in the longitudinal direction of the valve body so as to surround the outer surface of the valve body, and one end is supported inside the case and the other end is supported by the valve body.

The steam trap further includes a coil spring disposed on the same axis as the shape memory alloy spring and having a diameter larger or smaller than that of the shape memory alloy spring, wherein the first end of the coil spring is located inside the case And the second end portion is supported by the valve body, and the valve body portion provided with the shape memory alloy spring and the valve body portion provided with the coil spring are the same.

The steam trap further includes a coil spring disposed coaxially with the shape memory alloy spring and having a diameter larger or smaller than that of the shape memory alloy spring, wherein the coil spring has a smaller diameter than the shape memory alloy spring and the coil spring. Wherein one end of a spring of a larger diameter among the shape memory alloy springs and the coil spring is connected to the other end of the spring having a smaller diameter by a first end of the spring, And the other end is supported by the valve body.

Preferably, the diameter of the channel formed in the case is larger than a portion where the first end of the small-diameter spring is supported, and a portion where one end of the large-diameter spring is supported is larger, A support tuck is formed at a portion where one end of the support portion is supported.

In addition, a first latching jaw is formed in the pipeline of the case, in which the head portion of the valve body is engaged in a direction opposite to a direction in which the condensed water is discharged so that the discharge port is closed when the valve body linearly moves toward the inlet port side, A second engaging step for engaging a rear portion of the valve body in a direction in which the condensed water is discharged so that the moving distance of the valve body is limited when the body linearly moves toward the discharge port, The first engaging jaw and the second engaging jaw, respectively.

The valve body may include a hollow body having a front and a rear opening, and an orifice formed at a plurality of stages may be inserted into the valve body.

Preferably, an orifice formed in a multistage manner is provided inside the case, which is isolated from the valve body.

According to the means for solving the above-mentioned problems, the present invention has the following effects.

According to the present invention, the valve body is linearly reciprocated in accordance with the thermal deformation of the shape memory alloy spring to open and close the discharge port through which the condensed water is discharged, thereby smoothly discharging the condensed water generated in the steam transfer pipe such as a heat exchanger using steam There is an effect that can be made.

Further, according to the present invention, by providing an orifice formed in a multi-stage inside the case, fine particles such as scale present in the condensed water are prevented from accumulating in the vicinity of the orifice hole or the condensed-water discharge flow passage to prevent the orifice hole from being clogged or the flow passage to be narrowed There is an effect that can be.

In addition, the present invention provides a coil spring that expands and contracts in the same direction as the shape memory alloy spring to assist the elastic force of the shape memory alloy spring, so that even when the shape memory alloy spring is aged and the elastic force is lowered, So that the function can be exerted.

In addition, the present invention provides a duct which is formed so as to discharge a large amount of condensed water and an orifice which is installed so as to discharge a small amount of condensed water from the inside of the case, have.

In addition, according to the present invention, the valve body, which linearly reciprocates by the elastic force of the shape memory alloy spring and / or the coil spring, and the orifice through which the condensed water passes, The burden of the memory alloy spring and / or the coil spring can be minimized. As a result, the shape memory alloy spring and / or the coil spring smoothly operate, and the discharge port through which the condensed water is discharged can be properly opened and closed by the valve body.

FIG. 1 is a view showing a use state of a general orifice steam trap.
2 is a perspective view showing the inside of the steam trap according to the first embodiment of the present invention.
3 is a view showing a state in which the discharge port of the steam trap according to the first embodiment of the present invention is closed.
4 is a view illustrating a state in which the discharge port of the steam trap according to the first embodiment of the present invention is opened.
5 is a perspective view showing the inside of the steam trap according to the second embodiment of the present invention.
6 is a view illustrating a state in which the discharge port of the steam trap according to the second embodiment of the present invention is closed.
7 is a view showing a state where the discharge port of the steam trap according to the third embodiment of the present invention is closed.
8 is a view illustrating a state in which the discharge port of the steam trap according to the third embodiment of the present invention is opened.
9 is a view showing a state in which the discharge port of the steam trap according to the fourth embodiment of the present invention is closed.
10 is a view illustrating a state in which the discharge port of the steam trap according to the fifth embodiment of the present invention is closed.
11 is a view illustrating a state in which the discharge port of the steam trap according to the fifth embodiment of the present invention is opened.
12 is a view showing a state in which the discharge port of the steam trap according to the sixth embodiment of the present invention is closed.

Hereinafter, preferred embodiments of the steam trap according to the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and that the inventor should properly interpret the concepts of the terms to best describe their invention It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. In addition, since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It is to be understood that equivalents and modifications are possible.

2 to 4 are views showing a first embodiment of a steam trap according to the present invention. FIG. 2 is a perspective view showing the inside of the steam trap according to the first embodiment of the present invention, FIG. 3 is a view showing a state where the discharge port of the steam trap according to the first embodiment of the present invention is closed, 1 is a view showing a state where an outlet of a steam trap according to a first embodiment of the present invention is opened.

The steam trap according to the first embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, and a shape memory alloy spring 40 as shown in Figs. 2 to 4 .

The case 10 is made of a material having excellent heat resistance and is formed into a hollow cylindrical shape. The case 10 includes a duct 12 having condensed water generated by condensation of steam in the steam transfer pipe and having an inlet 14 through which the steam is introduced into the case 10 and an outlet 15 through which the steam is discharged to the outside of the case 10 Is formed.

The pipeline 12 formed inside the case 10 is provided with a condenser 12 for closing the discharge port 15 of the pipeline 12 when the valve body 20 to be described later linearly moves toward the inlet port 14 side of the pipeline 12. [ A first latching jaw 16 is formed in which the head portion 22 of the valve body 20 is engaged in a direction opposite to the direction in which the valve body 20 is discharged. That is, the discharge port 15 is closed by causing the head portion 22 of the valve body 20 to be caught by the outer side surface of the first latching jaw 16. At this time, the outer side lower end of the first latching jaw 16 is formed so as to be inclined downward inward, and the head portion 22 of the valve body 20 is formed to be inclined so as to correspond to the shape of the first latching jaw 16. When the valve body 20 linearly moves toward the inlet port 14 of the pipeline 12, the head portion 22 of the valve body 20 comes into contact with the outer side surface of the first latching jaw 16, And the discharge port 15 of the duct 12 is closed.

The pipeline 12 formed inside the case 10 is provided with condensed water so that the movement distance of the valve body 20 is limited when the valve body 20 linearly moves toward the discharge port 15 side of the pipeline 12 A second latching jaw 17 is formed in which the rear portion 24 of the valve body 20 is hooked. That is, when the discharge port 15 of the pipeline 12 is closed, the second latching jaw 17 and the rear portion 24 of the valve body 20 are spaced apart from each other by a predetermined distance, When the rear portion 24 of the valve body 20 is caught by the second stopping jaw 17 while the valve body 20 is linearly moved and the valve body 20 is linearly moved, The head portion 22 of the main body 20 is moved, whereby the discharge port 15 is opened.

The valve body 20 is provided in the pipeline 12 of the case 10 so as to open and close the pipeline 12 of the case 10 and is made of a lightweight material having excellent heat resistance, And an orifice 30 to be described later is inserted therein. The head portion 22 of the valve body 20 is formed so as to be inclined so as to correspond to the first stopping protrusion 16 formed on the case 10 and the rear portion 24 of the valve body 20 is formed on the case 10, The second engaging protrusion 17 is formed to correspond to the second engaging protrusion 17. [ At this time, the rear portion 24 of the valve body 20 is formed with a plurality of inflow holes 24a through which the condensed water flows in the longitudinal direction of the valve body 20, and through the plurality of inflow holes 24a, (12) of the case (10).

The orifice 30 is formed in a multi-stage series and is inserted into the valve body 20 so that condensed water introduced into the case 10 is discharged to the outside of the case 10. In this way, the orifice 30 formed in a multi-stage series is installed for the purpose of decompression by a labyrinth effect. Accordingly, fine particles such as scale existing in the condensed water can be prevented from accumulating in the vicinity of the hole of the orifice 30 or the condensed-water discharge flow passage, thereby preventing the hole of the orifice 30 from being blocked or narrowing the flow passage.

The shape memory alloy spring 40 is installed in the case 10 to linearly reciprocate the valve body 20 along the duct 12 of the case 10. When the shape memory alloy spring 40 is inflated, the head portion 22 of the valve body 20 closes the discharge port 15, and when the shape memory alloy spring 40 contracts, the head portion 22 of the valve body 20 The outlet 15 is opened. The shape memory alloy spring 40 is installed in the longitudinal direction of the valve body 20 so as to surround the outer surface of the valve body 20. The one end portion 42 of the shape memory alloy spring 40 is supported inside the discharge port 15 side of the case 10, that is, on the inner side surface of the first stopping jaw 16 and the other end portion 44 is supported by the valve body 20 That is, the rear portion 24, of the case 10 on the side of the inlet 14 side.

Accordingly, when the internal temperature of the case 10 is maintained at a high temperature of 100 deg. C or more, the shape memory alloy spring 40 expands. As the shape memory alloy spring 40 expands, the rear portion 24 of the valve body 20 is moved in the opposite direction to the flow of the condensed water, and the head portion 22 of the valve body 20 is moved So that it is caught by the jaws 16 to close the discharge port 15 of the duct 12. At this time, a small amount of condensed water flowing into the case 10 is discharged to the outside of the case 10 through the orifice 30.

The amount of the condensed water flowing into the case 10 through the inflow hole 24a formed in the rear portion 24 of the valve body 20 in the state in which the discharge port 15 of the pipeline 12 is closed When the condensed water is filled in the duct 12, the internal temperature of the case 10 is lowered. At this time, the shape memory alloy spring 40 shrinks. As the shape memory alloy spring 40 contracts, the rear portion 24 of the valve body 20 is moved in the direction in which the condensed water flows into the outside of the case 10, When the portion 24 is caught by the second latching jaw 17, the movement is stopped further. At this time, the head portion 22 of the valve body 20 also moves in a direction in which the condensed water flows into the case 10 to be discharged to the outside. As a result, the discharge port 15 of the pipeline 12 is opened, 12 are discharged to the outside of the case 10 through the discharge port 15. [

When the condensed water filled in the duct 12 of the case 10 is completely discharged to the outside of the case 10 and the steam again flows into the case 10, the temperature inside the case 10 becomes higher again, ) Is expanded, and the above-described process is repeated. As described above, the valve body 20 is linearly reciprocated in accordance with the thermal deformation of the shape memory alloy spring 40 to open and close the discharge port 15 through which the condensed water is discharged. As a result, The condensed water generated in the condenser can be smoothly discharged.

5 and 6 are views showing a second embodiment of the steam trap according to the present invention. FIG. 5 is a perspective view showing the inside of the steam trap according to the second embodiment of the present invention, and FIG. 6 is a view showing a state where the discharge port of the steam trap according to the second embodiment of the present invention is closed.

A steam trap according to a second embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, and a shape memory alloy spring 40, as shown in Figs. 5 and 6 .

The condensed water is discharged in the pipeline 12 formed inside the case 10 such that the discharge port 15 of the pipeline 12 is closed when the valve body 20 linearly moves toward the inlet port 14 of the pipeline 12 A first latching jaw 16 is formed in which the head portion 22 of the valve body 20 is hooked. That is, the discharge port 15 is closed by causing the head portion 22 of the valve body 20 to be caught by the outer side surface of the first latching jaw 16. At this time, the outer side lower end of the first latching jaw 16 is formed so as to be inclined downward inward, and the head portion 22 of the valve body 20 is formed to be inclined so as to correspond to the shape of the first latching jaw 16. When the valve body 20 linearly moves toward the inlet port 14 of the pipeline 12, the head portion 22 of the valve body 20 comes into sliding contact with the outer side surface of the first latching jaw 16 The outlet 15 of the duct 12 is closed naturally.

The pipeline 12 formed inside the case 10 is provided with condensed water so that the movement distance of the valve body 20 is limited when the valve body 20 linearly moves toward the discharge port 15 side of the pipeline 12 A second latching jaw 17 is formed in which the rear portion 24 of the valve body 20 is hooked. That is, when the discharge port 15 of the conduit 12 is closed, the second latching jaw 17 and the rear portion 24 of the valve body 20 are spaced apart from each other by a predetermined distance, and in the direction in which the condensed water is discharged, When the rear portion 24 of the valve body 20 is caught by the second stopping jaw 17 while the valve body 20 is linearly moved and the valve body 20 is linearly moved, The head portion 22 of the main body 20 is moved, whereby the discharge port 15 is opened.

The valve body 20 is provided on the pipeline 12 of the case 10 so as to open and close the pipeline 12 of the case 10 and is made of a lightweight material excellent in heat resistance. The head portion 22 of the valve body 20 is formed so as to be inclined so as to correspond to the first stopping protrusion 16 formed on the case 10 and the rear portion 24 of the valve body 20 is formed on the case 10, The second engaging protrusion 17 is formed to correspond to the second engaging protrusion 17. [ At this time, a plurality of inlet holes 24a through which the condensed water flows in the longitudinal direction of the valve body 20 are formed in the rear portion 24 of the valve body 20, The condensed water flows into the duct 12 of the case 10 through the inlet 14 of the duct 12 formed in the case 10.

The orifice 30 is formed in a multi-stage series and is installed in the case 10 so as to be isolated from the valve body 20 so that the condensed water flowing into the case 10 is discharged to the outside of the case 10. That is, the conduit 12 formed so as to discharge a large amount of condensed water and the orifice 30 installed so as to discharge a small amount of condensed water are made in the interior of the case 10, And has a convenient effect on management. The valve body 20 which reciprocates linearly by the elastic force of the shape memory alloy spring 40 in the case 10 and the orifice 30 through which the condensed water passes are made to be biased in the case 10, It is possible to minimize the burden on the shape memory alloy spring 40 that reciprocates the body 20 linearly so that the shape memory alloy spring 40 smoothly operates and the discharge port 15, through which the condensed water is discharged, Can be properly opened and closed.

As described above, the orifice 30 formed in a multi-stage series is installed for the purpose of decompression by a labyrinth effect. Accordingly, fine particles such as scale existing in the condensed water can be prevented from accumulating in the vicinity of the hole of the orifice 30 or the condensed-water discharge flow passage, thereby preventing the hole of the orifice 30 from being blocked or narrowing the flow passage.

Accordingly, when the internal temperature of the case 10 is maintained at a high temperature of 100 deg. C or more, the shape memory alloy spring 40 expands. As the shape memory alloy spring 40 expands, the rear portion 24 of the valve body 20 to which the other end portion 44 of the shape memory alloy spring 40 is fixed is moved in the opposite direction in which the condensed water flows The head portion 22 of the valve body 20 also moves in a direction opposite to the flow of the condensed water as the rear portion 24 of the valve body 20 moves. Stops moving further and closes the discharge port 15 of the duct 12 when the first stopper 16 is caught by the first stopper 16. At this time, a small amount of condensed water flowing into the case 10 is discharged to the outside of the case 10 through the orifice 30.

The amount of the condensed water flowing into the case 10 through the inflow hole 24a formed in the rear portion 24 of the valve body 20 in the state in which the discharge port 15 of the pipeline 12 is closed When the condensed water is filled in the duct 12, the internal temperature of the case 10 is lowered. At this time, the shape memory alloy spring 40 shrinks. As the shape memory alloy spring 40 is contracted, the rear portion 24 of the valve body 20 to which the other end portion 44 of the shape memory alloy spring 40 is fixed flows into the outside of the case 10 When the rear portion 24 of the valve body 20 is caught by the second latching jaw 17, the movement of the valve body 20 is stopped. At this time, as the rear portion 24 of the valve body 20 moves, the head portion 22 of the valve body 20 also moves in a direction in which condensed water flows in and out of the case 10, The discharge port 15 of the pipeline 12 is opened and a large amount of condensed water that has been filled in the pipeline 12 is discharged to the outside of the case 10 through the discharge port 15. At the same time, a small amount of condensed water is discharged to the outside of the case 10 through the orifice 30 as well.

When the condensed water filled in the duct 12 of the case 10 is completely discharged to the outside of the case 10, the temperature inside the case 10 becomes higher again, and the shape memory alloy spring 40 expands And the above-described process is repeated. As described above, the valve body 20 is linearly reciprocated in accordance with the thermal deformation of the shape memory alloy spring 40 to open and close the discharge port 15 through which the condensed water is discharged. As a result, The condensed water generated in the condenser can be smoothly discharged.

7 and 8 are views showing a third embodiment of the steam trap according to the present invention. FIG. 7 is a view showing a state where the discharge port of the steam trap according to the third embodiment of the present invention is closed, and FIG. 8 is a view showing a state where the discharge port of the steam trap according to the third embodiment of the present invention is opened.

7 and 8, the steam trap according to the third embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, a shape memory alloy spring 40, (50).

The valve body 20 is provided in the pipeline 12 of the case 10 so as to open and close the pipeline 12 of the case 10 and is made of a lightweight material having excellent heat resistance, And the orifice 30 is inserted therein. The head portion 22 of the valve body 20 is formed so as to be inclined so as to correspond to the first stopping protrusion 16 formed on the case 10 and the rear portion 24 of the valve body 20 is formed on the case 10, The second engaging protrusion 17 is formed to correspond to the second engaging protrusion 17. [ At this time, a plurality of inlet holes 24a through which the condensed water flows in the longitudinal direction of the valve body 20 are formed in the rear portion 24 of the valve body 20, The condensed water flows into the duct 12 of the case 10 through the inlet 14 of the duct 12 formed in the case 10.

The orifice 30 is formed in a multi-stage series and is installed inside the case 10 so that the condensed water introduced into the case 10 is discharged to the outside of the case 10, and the valve body 20, As shown in FIG. In this way, the orifice 30 formed in a multi-stage series is installed for the purpose of decompression by a labyrinth effect. Accordingly, fine particles such as scale existing in the condensed water can be prevented from accumulating in the vicinity of the hole of the orifice 30 or the condensed-water discharge flow passage, thereby preventing the hole of the orifice 30 from being blocked or narrowing the flow passage.

The shape memory alloy spring 40 is installed in the case 10 to linearly reciprocate the valve body 20 along the duct 12 of the case 10. When the shape memory alloy spring 40 is inflated, the head portion 22 of the valve body 20 closes the discharge port 15, and when the shape memory alloy spring 40 contracts, the head portion 22 of the valve body 20 The outlet 15 is opened. The shape memory alloy spring 40 is installed in the longitudinal direction of the valve body 20 so as to surround the outer surface of the valve body 20. The one end portion 42 of the shape memory alloy spring 40 is supported inside the discharge port 15 side of the case 10, that is, on the inner side surface of the first stopping jaw 16 and the other end portion 44 is supported by the valve body 20 That is, the rear portion 24 of the case 10, which is located on the inlet 14 side.

The coil spring 50 is arranged on the same axis as the shape memory alloy spring 40 and is smaller in diameter than the shape memory alloy spring 40. Hereinafter, the shape memory alloy spring 40 will be described as a spring having a large diameter, and the coil spring 50 will be described as a spring having a small diameter. On the other hand, it is also possible to replace the shape memory alloy spring 40 with a spring having a small diameter and the coil spring 50 with a spring having a large diameter, unlike the description of the present invention.

The first end portion 52 of the coil spring 50 is supported on the side of the discharge port 15 side of the case 10, that is, on the inner side surface of the first latching jaw 16 and the second end portion 54 is supported on the valve body 20, which is located on the side of the inlet 14 of the case 10, that is, the rear portion 24. At this time, it is preferable that the portion of the valve body 20 provided with the shape memory alloy spring 40 and the portion of the valve body 20 provided with the coil spring 50 are the same.

In the steam trap constructed as described above, when the internal temperature of the case 10 is maintained at a high temperature of 100 deg. C or more, the shape memory alloy spring 40 expands. It is needless to say that the expansion force of the shape memory alloy spring 40 must be larger than the tensile force of the coil spring 50 at this time as the shape memory alloy spring 40 expands.

When the shape memory alloy spring 40 and the coil spring 50 are expanded, the other end portion 44 of the shape memory alloy spring 40 and the second end portion 54 of the coil spring 50 are fixed to the valve body 20 The rear portion 24 of the valve body 20 moves in the direction opposite to the direction in which the condensed water flows in and the head portion 22 of the valve body 20 also receives the condensed water as the rear portion 24 of the valve body 20 moves. When the head portion 22 of the valve body 20 is caught by the first latching jaw 16, the movement of the head portion 22 is stopped and the discharge port 15 of the pipeline 12 is closed. At this time, a small amount of condensed water flowing into the case 10 is discharged to the outside of the case 10 through the orifice 30.

The amount of the condensed water flowing into the case 10 through the inflow hole 24a formed in the rear portion 24 of the valve body 20 in the state in which the discharge port 15 of the pipeline 12 is closed When the condensed water is filled in the duct 12, the internal temperature of the case 10 is lowered. At this time, the shape memory alloy spring 40 shrinks. At this time, the coil spring 50 also expands and then shrinks due to the restoring force to return to the original state, thereby helping the shape memory alloy spring 40 to contract. As the shape memory alloy spring 40 and the coil spring 50 contract as described above, the other end portion 44 of the shape memory alloy spring 40 and the second end portion 54 of the coil spring 50 are fixed The rear portion 24 of the valve body 20 moves in the direction of being discharged to the outside of the case 10 and the rear portion 24 of the valve body 20 moves to the side of the second engaging jaw 17, It stops moving any more. At this time, as the rear portion 24 of the valve body 20 moves, the head portion 22 of the valve body 20 also moves in a direction in which condensed water flows in and out of the case 10, The discharge port 15 of the pipeline 12 is opened and a large amount of condensed water that has been filled in the pipeline 12 is discharged to the outside of the case 10 through the discharge port 15. At the same time, a small amount of condensed water is discharged to the outside of the case 10 through the orifice 30 as well.

When the condensed water filled in the duct 12 of the case 10 is completely discharged to the outside of the case 10, the temperature inside the case 10 becomes higher again, and the shape memory alloy spring 40, (50) expands, and the above-described process is repeated. As described above, the valve body 20 is linearly reciprocated in accordance with the thermal deformation of the shape memory alloy spring 40 to open and close the discharge port 15 through which the condensed water is discharged. As a result, The condensed water generated in the condenser can be smoothly discharged.

Further, by providing the coil spring 50 that expands and contracts in the same direction as the shape memory alloy spring 40 to assist the elastic force of the shape memory alloy spring 40, the shape memory alloy spring 40 is aged, The function of the steam trap can be exerted.

9 is a view showing a state in which the discharge port of the steam trap according to the fourth embodiment of the present invention is closed.

9, the steam trap according to the fourth embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, a shape memory alloy spring 40, and a coil spring 50, . The case 10, the shape memory alloy spring 40, and the coil spring 50 in the steam trap according to the fourth embodiment of the present invention are the same as those in the third embodiment described above, and thus the description thereof will be omitted.

The orifice 30 is formed in a multi-stage series and is installed in the case 10 so as to be isolated from the valve body 20 so that the condensed water flowing into the case 10 is discharged to the outside of the case 10. That is, the conduit 12 formed so as to discharge a large amount of condensed water and the orifice 30 installed so as to discharge a small amount of condensed water are made in the interior of the case 10, And has a convenient effect on management. The valve body 20 which linearly reciprocates by the elastic force of the shape memory alloy spring 40 and the coil spring 50 in the case 10 and the orifice 30 through which the condensed water passes are provided in the case 10 It is possible to minimize the burden on the shape memory alloy spring 40 and the coil spring 50 that make the valve body 20 linearly reciprocate so that the shape memory alloy spring 40 and the coil spring 50 So that the valve body 20 can properly open and close the discharge port 15 through which the condensed water is discharged.

In this way, the orifice 30 formed in a multi-stage series is installed for the purpose of decompression by a labyrinth effect. Accordingly, fine particles such as scale existing in the condensed water can be prevented from accumulating in the vicinity of the hole of the orifice 30 or the condensed-water discharge flow passage, thereby preventing the hole of the orifice 30 from being blocked or narrowing the flow passage.

10 and 11 are views showing a fifth embodiment of the steam trap according to the present invention. FIG. 10 is a view showing a state where the discharge port of the steam trap according to the fifth embodiment of the present invention is closed, and FIG. 11 is a view illustrating a state where the discharge port of the steam trap according to the fifth embodiment of the present invention is opened.

10 and 11, the steam trap according to the fifth embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, a shape memory alloy spring 40, (50).

On the other hand, the diameter of the channel 12 formed in the case 10 is smaller than the diameter of the one end of the shape memory alloy spring 40, which is larger in diameter than the portion where the first end 52 of the coil spring 50, And a support step 18 is formed at a position where one end 42 of the shape memory alloy spring 40 is supported.

The shape memory alloy spring 40 is installed in the case 10 to linearly reciprocate the valve body 20 along the duct 12 of the case 10. When the shape memory alloy spring 40 is inflated, the head portion 22 of the valve body 20 closes the discharge port 15, and when the shape memory alloy spring 40 contracts, the head portion 22 of the valve body 20 The outlet 15 is opened. The shape memory alloy spring 40 is installed in the longitudinal direction of the valve body 20 so as to surround the outer surface of the valve body 20. One end portion 42 of the shape memory alloy spring 40 is spaced apart from the portion where the first end portion 52 of the coil spring 50 is supported in the inward direction (direction opposite to the direction in which the condensed water is discharged) And the other end portion 44 is fixed to the portion of the valve body 20 located at the inlet 14 side of the case 10, that is, the rear portion 24.

The first end portion 52 of the coil spring 50 is supported on the side of the discharge port 15 side of the case 10, that is, on the inner side surface of the first latching jaw 16 and the second end portion 54 is supported on the valve body 20, which is located on the side of the inlet 14 of the case 10, that is, the rear portion 24.

12 is a view showing a state in which the discharge port of the steam trap according to the sixth embodiment of the present invention is closed.

12, the steam trap according to the sixth embodiment of the present invention includes a case 10, a valve body 20, an orifice 30, a shape memory alloy spring 40, and a coil spring 50, . The case 10, the shape memory alloy spring 40, and the coil spring 50 in the steam trap according to the sixth embodiment of the present invention are the same as those of the fifth embodiment described above, and thus the description thereof will be omitted.

Although the present invention has been described with reference to the coil-shaped shape memory alloy springs and coil springs, the present invention can be embodied as any other types of springs, such as plate shape memory alloy springs and plate springs.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be apparent to those of ordinary skill in the art.

10: Case 12:
14: inlet 15: outlet
16: first stopping jaw 17: second stopping jaw
18: support jaw 20: valve body
30: Orifice 40: Shape memory alloy spring
50: coil spring

Claims

A hollow case having an inlet port through which the condensed water flows into the inside and a ducting through which the outlet port is discharged to the outside;
A valve body installed in a pipeline of the case to open and close a pipeline of the case;
A plurality of orifices formed in the casing so as to discharge the condensed water introduced into the casing to the outside of the casing; And
And a shape memory alloy spring installed in the case to linearly reciprocate the valve body along a duct of the case,
Wherein when the shape memory alloy spring expands, the head portion of the valve body closes the discharge port, and when the shape memory alloy spring contracts, the head portion of the valve body opens the discharge port.

The method according to claim 1,
Wherein the shape memory alloy spring is installed in a longitudinal direction of the valve body so as to surround the outer surface of the valve body and one end is supported inside the case and the other end is supported by the valve body.

The method of claim 2,
Wherein the steam trap further includes a coil spring disposed on the same axis as the shape memory alloy spring and having a diameter larger or smaller than that of the shape memory alloy spring,
Wherein a first end of the coil spring is supported within the case and a second end is supported by the valve body,
Wherein the valve body portion in which the shape memory alloy spring is provided and the valve body portion in which the coil spring is provided are identical.

The method of claim 2,
Wherein the steam trap further includes a coil spring disposed on the same axis as the shape memory alloy spring and having a diameter larger or smaller than that of the shape memory alloy spring,
Wherein a first end of a spring having a small diameter of the shape memory alloy spring and a coil spring is supported inside the case and a second end is supported by the valve body,
One end of the spring having a large diameter among the shape memory alloy springs and the coil spring is spaced inward from a portion where the first end of the small diameter spring is supported and is supported inside the case and the other end is supported by the valve body Wherein the steam trap is a steam trap.

The method of claim 4,
Wherein a diameter of a channel formed in the case is larger than a portion of the spring having a smaller diameter than a portion where a first end of the spring is supported,
And a support step is formed at a portion where one end of the spring having a large diameter is supported.

The method according to claim 1,
Wherein the valve body is formed with a first engagement protrusion which is engaged with a head portion of the valve body in a direction opposite to a direction in which the condensed water is discharged so that the discharge port is closed when the valve body linearly moves toward the inlet port side, A second stopping jaw is formed at a rear portion of the valve body in a direction in which the condensed water is discharged so that the movement distance of the valve body is limited when the valve body linearly moves toward the discharge port side,
Wherein the head portion and the rear portion of the valve body are formed to correspond to the first and second stopping jaws, respectively.

The method according to any one of claims 1 to 6,
Wherein the valve body comprises a hollow body having a front and a rear opening, and an orifice formed at a plurality of stages is inserted into the valve body.

The method according to any one of claims 1 to 6,
Wherein an orifice formed in a multi-stage structure is provided inside the case, the steam trap being isolated from the valve body.