JP7638514B2 - Drain Trap - Google Patents

Description

This application relates to a drain trap.

Drain traps that are installed in steam systems and the like to suppress the discharge of steam while discharging condensate are known. For example, the drain trap disclosed in Patent Document 1 has multiple valve holes that communicate with a drain discharge passage, and temperature-responsive valves that open and close each valve hole. In this drain trap, when the temperature drops to a predetermined temperature, the multiple temperature-responsive valves open, and condensate is discharged from the multiple valve holes into the discharge passage.

Japanese Patent Application Publication No. 8-86396

However, in the above-mentioned drain trap, the drain discharged from multiple valve holes collides with each other in the discharge passage, which may reduce the flow rate of the drain and reduce the drain discharge capacity (discharge flow rate).

The technology disclosed in this application was developed in consideration of these circumstances, and its purpose is to suppress the decrease in discharge capacity (discharge flow rate) caused by collisions between drains.

The technology disclosed in this application is a drain trap that includes a casing, multiple valve mechanisms, and a discharge path. The casing is formed with an inlet and an outlet for drain. The multiple valve mechanisms are provided within the casing and have a valve hole through which drain flowing in from the inlet passes, and a valve body that opens and closes the valve hole depending on temperature. The discharge path has multiple vertical flow paths extending vertically from the valve hole of each of the multiple valve mechanisms, and a horizontal flow path in which the multiple vertical flow paths are connected in sequence in the upstream and downstream directions and in which drains from the multiple vertical flow paths join, and leads the joined drain in the horizontal flow path to the outlet. The horizontal flow path is inclined downward as it approaches the downstream side.

The technology disclosed in this application makes it possible to suppress the decrease in discharge capacity (discharge flow rate) caused by collisions between drains.

FIG. 1 is a cross-sectional view showing a schematic configuration of a drain trap. FIG. 2 is a partial cross-sectional view taken along line AA of FIG. FIG. 3 is a cross-sectional view taken along line BB of FIG. 2, with some parts omitted.

The following describes embodiments of the present application with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the technology disclosed in the present application, its applications, or its uses.

The drain trap 100 of this embodiment is installed in a steam system, etc., and allows drain to flow out when drain flows in, but prevents steam from flowing out when steam flows in.

Figure 1 is a cross-sectional view showing the schematic configuration of a drain trap 100. The drain trap 100 includes a casing 10 in which a flow path for a fluid, including liquid, is formed, and two types of valve mechanisms (main valve mechanism 30 and sub-valve mechanism 40) that are provided in the flow path and open and close the flow path. The main valve mechanism 30 discharges drainage that has flowed into the casing 10. The sub-valve mechanism 40 discharges air and drainage that has flowed into the casing 10.

The casing 10 has a lower portion 11 and an upper portion 12. The casing 10 is formed with a drain inlet 21 and outlet 23, a storage chamber 22, and two drain paths (main drain path 24, secondary drain path 25). The storage chamber 22 is connected to the inlet 21, and drain that flows in from the inlet 21 is temporarily stored in the storage chamber 22. The main drain path 24 connects the storage chamber 22 to the outlet 23, and the secondary drain path 25 connects the storage chamber 22 to the main drain path 24.

In the casing 10, a flow path is formed by the inlet 21, the storage chamber 22, the outlet 23, the main discharge path 24, and the secondary discharge path 25. Specifically, the flow path has a main flow path for discharging drainage and a secondary flow path for discharging air and drainage. The main flow path is formed by the inlet 21, the storage chamber 22, the main discharge path 24, and the outlet 23. The secondary flow path is formed by the inlet 21, the storage chamber 22, the secondary discharge path 25, the main discharge path 24, and the outlet 23.

The inlet 21 and the outlet 23 are provided in the lower part 11. The inlet 21 and the outlet 23 are provided coaxially. In other words, the inlet 21 and the outlet 23 are formed on the same axis Y that extends horizontally. The storage chamber 22 is provided in the lower part 11. The main discharge path 24 is formed in the lower part 11, with its upstream end connected to the lower part of the storage chamber 22 and its downstream end connected to the outlet 23. The secondary discharge path 25 is formed across the lower part 11 and the upper part 12, with its upstream end connected to the upper part of the storage chamber 22 and its downstream end connected to the main discharge path 24.

The inlet 21 and outlet 23 are each connected to the piping of the steam system. As shown in FIG. 1, in the drain trap 100, the axis Y direction is the upstream-downstream direction, and the height direction is the up-down direction. In addition, in the drain trap 100, the right side facing downstream is defined as the right, and the left side is defined as the left (see FIG. 2).

The main valve mechanism 30 opens and closes the main flow path. Specifically, the main valve mechanism 30 is a valve mechanism that allows drain to flow from the storage chamber 22 to the main discharge path 24, while preventing steam from flowing from the storage chamber 22 to the main discharge path 24. The main valve mechanism 30 is provided in the storage chamber 22, and has a valve body 31 and a valve seat 32.

The valve body 31 is a hollow spherical float, and is housed in the storage chamber 22 in a free state. The valve seat 32 is provided at the connection of the storage chamber 22 to the main discharge passage 24. The valve seat 32 is formed with a valve hole 33 as a main valve hole through which the drain of the storage chamber 22 passes. In other words, the valve hole 33 is provided at the bottom of the storage chamber 22, and connects the storage chamber 22 to the main discharge passage 24. The upstream end of the valve hole 33 forms an orifice. The main discharge passage 24 is connected to the valve hole 33, and guides the drain that passes through the valve hole 33 to the outlet 23.

In the main valve mechanism 30, the valve element 31 rises and falls according to the drain water level in the storage chamber 22, opening and closing the valve hole 33. Specifically, when the drain in the storage chamber 22 increases, the valve element 31 rises and leaves the valve seat 32, opening the valve hole 33. On the other hand, when the drain in the storage chamber 22 decreases, the valve element 31 falls and sits on the valve seat 32, closing the valve hole 33. In this way, the valve hole 33 is opened and closed, thereby opening and closing the main flow path.

The storage chamber 22 is provided with a screen 27 at the communicating portion with the inlet 21. The screen 27 prevents foreign matter from entering the storage chamber 22 from the inlet 21. The storage chamber 22 is provided with a valve cover 28 near the top. The valve cover 28 is provided above the valve seat 32, and divides the storage chamber 22 into upper and lower parts. The valve cover 28 prevents the valve body 31 from floating up to a predetermined height or higher by coming into contact with the valve cover 28. Although not shown, the valve cover 28 is provided with a through hole through which drain from the inlet 21 flows.

The sub-valve mechanisms 40 open and close the sub-flow passage, and multiple sub-valve mechanisms (four in this embodiment) are provided. Specifically, the four sub-valve mechanisms 40 are valve mechanisms that allow low-temperature air and drain to flow from the storage chamber 22 to the sub-discharge passage 25, while preventing steam from flowing from the storage chamber 22 to the sub-discharge passage 25. Each of the four sub-valve mechanisms 40 is provided above the storage chamber 22, and has a valve body 41 and a valve seat 42.

When the four sub-valve mechanisms 40 are described separately, they are referred to as the first sub-valve mechanism 40a, the second sub-valve mechanism 40b, the third sub-valve mechanism 40c, and the fourth sub-valve mechanism 40d (see Figures 1 and 3). In this embodiment, the first sub-valve mechanism 40a and the second sub-valve mechanism 40b correspond to the valve mechanisms according to the claims of this application.

The valve body 41 is a temperature-responsive member. Although not shown, the valve body 41 contains a thin plate diaphragm and a thermal expansion/contraction liquid inside. The valve seat 42 is provided at the connection part of the storage chamber 22 to the secondary discharge path 25. The valve seat 42 is formed with a valve hole 43 through which the drain of the storage chamber 22 (i.e., the drain that flows in from the inlet 21) passes. In other words, the valve hole 43 is provided at the top of the storage chamber 22, and connects the storage chamber 22 to the secondary discharge path 25. The upstream end of the valve hole 43 forms an orifice.

The sub-valve mechanism 40 is configured so that when the temperature of the valve body 41 (storage chamber 22) drops to a predetermined temperature, the valve body 41 opens the valve hole 43. That is, in the sub-valve mechanism 40, the valve body 41 expands or contracts depending on the temperature, opening and closing the valve hole 43. Specifically, when the temperature of the valve body 41 (storage chamber 22) drops to a predetermined temperature, the valve body 41 contracts and leaves the valve seat 42, opening the valve hole 43. On the other hand, when the temperature of the valve body 41 (storage chamber 22) rises above the predetermined temperature, the valve body 41 expands and seats on the valve seat 42, closing the valve hole 43. In this way, the valve hole 43 is opened and closed, thereby opening and closing the sub-flow path.

The first sub-valve mechanism 40a and the second sub-valve mechanism 40b are arranged in order from the upstream side in the axial center Y direction. The third sub-valve mechanism 40c and the fourth sub-valve mechanism 40d are arranged in order in the horizontal direction perpendicular to the axial center Y (see FIG. 3). The third sub-valve mechanism 40c and the fourth sub-valve mechanism 40d are arranged along an axis passing through approximately the center between the first sub-valve mechanism 40a and the second sub-valve mechanism 40b. The four sub-valve mechanisms 40 are arranged at the same height in the storage chamber 22. With the four sub-valve mechanisms 40 arranged in this manner, the valve hole 43 of the first sub-valve mechanism 40a is closest to the inlet 21.

Furthermore, among the four sub-valve mechanisms 40, the predetermined temperature of the first sub-valve mechanism 40a, which is closest between the valve hole 43 and the inlet 21, is set to the highest temperature. In other words, among the four sub-valve mechanisms 40, when the temperature of the valve body 41 (storage chamber 22) drops, the first sub-valve mechanism 40a is configured to open the earliest. Note that the predetermined temperatures of the three sub-valve mechanisms 40 other than the first sub-valve mechanism 40a are set to the same temperature.

Figure 2 is a partial cross-sectional view taken along line A-A in Figure 1. Figure 3 is a cross-sectional view taken along line B-B in Figure 2, with some parts omitted.

The secondary discharge passage 25 includes a first flow passage 251 and a second flow passage 252 extending vertically from the valve holes 43 of the two secondary valve mechanisms 40 (first secondary valve mechanism 40a, second secondary valve mechanism 40b), a fifth flow passage 255 in which the first flow passage 251 and the second flow passage 252 are connected in the upstream and downstream directions, and the drains from the first flow passage 251 and the second flow passage 252 join together, and the joined drain of the fifth flow passage 255 is led to the outlet 23. The secondary discharge passage 25 corresponds to the discharge passage according to the claims of this application.

Specifically, the secondary discharge passage 25 has eight passages (first passage 251 to eighth passage 258).

The first flow path 251 to the fourth flow path 254 are vertical flow paths that extend vertically in a straight line from the valve hole 43. The first flow path 251 to the fourth flow path 254 are connected to the valve holes 43 of the four sub-valve mechanisms 40. In other words, the first flow path 251 is connected to the valve hole 43 of the first sub-valve mechanism 40a, the second flow path 252 is connected to the valve hole 43 of the second sub-valve mechanism 40b, the third flow path 253 is connected to the valve hole 43 of the third sub-valve mechanism 40c, and the fourth flow path 254 is connected to the valve hole 43 of the fourth sub-valve mechanism 40d. The first flow path 251 and the second flow path 252 correspond to the vertical flow paths according to the claims of this application.

The fifth flow path 255 to the seventh flow path 257 are horizontal flow paths connected to the first flow path 251 to the fourth flow path 254. More specifically, the fifth flow path 255 is a linear flow path extending in the direction of the axis Y when viewed from above. The first flow path 251 is connected to the vicinity of the upstream end of the fifth flow path 255. The second flow path 252 is connected to the approximate center of the fifth flow path 255. In other words, the first flow path 251 and the second flow path 252 are connected to the fifth flow path 255 in order from the upstream side. Furthermore, the fifth flow path 255 is a common horizontal flow path for the first flow path 251 and the second flow path 252. The fifth flow path 255 corresponds to the horizontal flow path according to the claims of this application. The sixth flow path 256 is located to the right of the fifth flow path 255. The sixth flow path 256 is a linear flow path inclined with respect to the axis Y when viewed from above. The third flow path 253 is connected to the sixth flow path 256 near the upstream end. The seventh flow path 257 is located to the left of the fifth flow path 255. When viewed from above, the seventh flow path 257 is a linear flow path that is inclined with respect to the axis Y.

The flow path formed by the first flow path 251 and the fifth flow path 255, the flow path formed by the third flow path 253 and the sixth flow path 256, and the flow path formed by the fourth flow path 254 and the seventh flow path 257 merge at an acute angle toward each other's downstream side. That is, the fifth flow path 255, the sixth flow path 256, and the seventh flow path 257 merge at an acute angle toward each other's downstream side.

Specifically, the fifth flow path 255, the sixth flow path 256, and the seventh flow path 257 merge (are connected) at their respective downstream ends. The merge angle θa between the fifth flow path 255 and the sixth flow path 256, i.e., the intersection angle between the axis Xa of the fifth flow path 255 and the axis Xb of the sixth flow path 256, is an acute angle. The merge angle θb between the fifth flow path 255 and the seventh flow path 257, i.e., the intersection angle between the axis Xa of the fifth flow path 255 and the axis Xc of the seventh flow path 257, is an acute angle. Furthermore, the merge angle between the sixth flow path 256 and the seventh flow path 257 (merging angle θa + merging angle θb) is also an acute angle.

The eighth flow path 258 is a flow path that extends vertically in a straight line. The upstream end of the eighth flow path 258 is connected to the downstream ends (i.e., the junction) of the fifth flow path 255, the sixth flow path 256, and the seventh flow path 257. The downstream end of the eighth flow path 258 is connected to the main discharge path 24. In other words, the eighth flow path 258 is a communication path that communicates with the downstream end of the fifth flow path 255 and the main discharge path 24. The eighth flow path 258 leads the junction drain of the fifth flow path 255, the sixth flow path 256, and the seventh flow path 257 to the main discharge path 24 and ultimately to the outlet 23.

The secondary discharge passage 25 is disposed above the outlet 23. In other words, the fifth flow passage 255, the sixth flow passage 256, and the seventh flow passage 257 are located above the outlet 23. The fifth flow passage 255, the sixth flow passage 256, and the seventh flow passage 257 are inclined downward toward the downstream side. In other words, as shown in FIG. 1, the fifth flow passage 255 is inclined at an inclination angle θr with respect to the horizontal direction. Although not shown, the sixth flow passage 256 and the seventh flow passage 257 are also inclined in a similar manner.

Actions
The operation of the drain trap 100 described above during operation of the steam system will now be described. During operation, high-temperature and high-pressure drain flows into the drain trap 100.

Specifically, high-temperature, high-pressure drain flows in through the inlet 21 and is stored in the storage chamber 22. In the main valve mechanism 30, when the drain water level in the storage chamber 22 rises to a predetermined level, the valve body 31 rises and leaves the valve seat 32, opening the valve hole 33. In other words, the main valve mechanism 30 opens. Then, the drain in the storage chamber 22 flows through the main valve mechanism 30 into the main discharge path 24 and out through the outlet 23.

When the amount of drainage flowing into the storage chamber 22 from the inlet 21 is greater than the amount of drainage flowing out of the main valve mechanism 30, the drainage accumulates to the top of the storage chamber 22. In the four sub-valve mechanisms 40, the temperature of the valve body 41 approaches the temperature of the drainage, but does not exceed a predetermined temperature. Therefore, in the four sub-valve mechanisms 40, the valve body 41 is lifted from the valve seat 42 and the valve hole 43 is open. Therefore, the drainage flows out into the sub-discharge passage 25 via the four sub-valve mechanisms 40, passes through the main discharge passage 24, and flows out of the outlet 23.

More specifically, the drain that has passed through the first sub-valve mechanism 40a flows into the fifth flow path 255 via the first flow path 251. The drain that has passed through the second sub-valve mechanism 40b flows into the fifth flow path 255 via the second flow path 252 and merges with the drain that has passed through the first sub-valve mechanism 40a. The drain that has passed through the third sub-valve mechanism 40c flows into the sixth flow path 256 via the third flow path 253. The drain that has passed through the fourth sub-valve mechanism 40d flows into the seventh flow path 257 via the fourth flow path 254.

The fifth flow path 255, the sixth flow path 256, and the seventh flow path 257 are inclined downward toward the downstream side, so the flow rate of the drain increases in the fifth flow path 255 and the like compared to, for example, a flow path that extends horizontally. As a result, the drain discharge flow rate increases.

When the flow rate of the drain in the fifth flow path 255 increases in this way, the pressure in the fifth flow path 255 decreases. As a result, the drain in the second flow path 252 is sucked into the fifth flow path 255. This promotes the outflow of the drain in the second sub-valve mechanism 40b. As a result, the decrease in discharge capacity (discharge flow rate) caused by the collision (confluence) of the drains in the fifth flow path 255 is suppressed.

The drains that flow through the fifth flow path 255, sixth flow path 256, and seventh flow path 257 merge with each other. At this time, since the merging angles of the fifth flow path 255, sixth flow path 256, and seventh flow path 257 are acute angles, the decrease in flow rate caused by the drains colliding (merging) with each other is suppressed compared to when the merging angles are, for example, 90 degrees or obtuse angles. Therefore, the decrease in discharge capacity (discharge flow rate) caused by the drains colliding (merging) with each other is suppressed. The merged drains from the fifth flow path 255 and the like flow through the eighth flow path 258 and the main discharge path 24 and flow out of the outlet 23.

On the other hand, when high-temperature, high-pressure steam flows into the storage chamber 22 from the inlet 21, the drain of the storage chamber 22 flows out of the main valve mechanism 30 and decreases, and eventually the valve body 31 seats on the valve seat 32. In this way, the main valve mechanism 30 closes, and the outflow of steam from the valve hole 33 is prevented. Also, when steam flows into the storage chamber 22, the temperature of the valve body 41 in the four sub-valve mechanisms 40 rises. Then, the valve body 41 expands and seats on the valve seat 42. In this way, the sub-valve mechanisms 40 close, and the outflow of steam from the valve hole 43 is prevented.

After the outflow of steam is thus prevented, for example, if a large amount of drainage rapidly flows into the storage chamber 22, the temperature of the valve body 41 (storage chamber 22) in the four sub-valve mechanisms 40 gradually decreases. In this case, since the predetermined temperature of the first sub-valve mechanism 40a is set to the highest temperature among the four sub-valve mechanisms 40, the first sub-valve mechanism 40a opens first. Therefore, since the valve hole 43 of the first sub-valve mechanism 40a is closest to the inlet 21, the drainage that has flowed in from the inlet 21 can be quickly discharged to the sub-discharge path 25.

In this way, during operation, the drain trap 100 allows incoming high-temperature drain to flow downstream while preventing incoming steam from escaping.

When the steam system starts operating (when starting up), the temperature of the valve body 41 is below a predetermined temperature, so the four auxiliary valve mechanisms 40 are open. At this start of operation, low-temperature, low-pressure residual drain from the steam system flows into the drain trap 100. The residual drain that has flowed into the storage chamber 22 flows out of the outlet 23 via the main valve mechanism 30 and the auxiliary valve mechanism 40. Even at this start of operation, the auxiliary discharge path 25 suppresses a decrease in discharge capacity (discharge flow rate) caused by collisions (confluence) of drains.

At the start of operation, air present in the piping of the steam system also flows into the drain trap 100 together with the residual drain. The air that flows into the drain trap 100 flows from the storage chamber 22 through the secondary valve mechanism 40 into the secondary discharge path 25, and then flows through the main discharge path 24 and out of the outlet 23.

As described above, the drain trap 100 of the embodiment includes a casing 10 in which the drain inlet 21 and outlet 23 are formed, two auxiliary valve mechanisms 40 (valve mechanisms, first auxiliary valve mechanism 40a and second auxiliary valve mechanism 40b) that are provided in the casing 10 and have a valve hole 43 through which the drain flowing in from the inlet 21 passes and a valve body 41 that opens and closes the valve hole 43 depending on the temperature, a first flow path 251 (vertical flow path) and a second flow path 252 (vertical flow path) extending vertically from each valve hole 43 of the two auxiliary valve mechanisms 40, a fifth flow path 255 (horizontal flow path) in which the first flow path 251 and the second flow path 252 are connected in order in the upstream and downstream directions and in which the drains from the first flow path 251 and the second flow path 252 join, and a secondary discharge path 25 that leads the joined drain of the fifth flow path 255 to the outlet 23. The fifth flow path 255 is inclined downward as it goes downstream.

According to the above configuration, since the fifth flow path 255 is inclined downward toward the downstream side, the flow rate of the drain in the fifth flow path 255 increases compared to when the fifth flow path extends horizontally. Therefore, in the portion of the fifth flow path 255 to which the second flow path 252 is connected, the pressure decreases due to the increased flow rate of the drain. Therefore, the drain in the second flow path 252 is sucked into the fifth flow path 255. Therefore, the outflow of the drain in the second sub-valve mechanism 40b can be promoted, and as a result, the decrease in the discharge capacity (discharge flow rate) caused by the collision (confluence) of the drains can be suppressed.

In addition, in the drain trap 100 of the above embodiment, the two sub-valve mechanisms 40 are configured so that the valve body 41 opens the valve hole 43 when the temperature of the valve body 41 drops to a predetermined temperature. Of the two sub-valve mechanisms 40 (the first sub-valve mechanism 40a and the second sub-valve mechanism 40b), the predetermined temperature of the first sub-valve mechanism 40a, which is closest between the valve hole 43 and the inlet 21, is set to the highest temperature.

According to the above configuration, when the temperature of the valve body 41 (storage chamber 22) gradually drops, the first sub-valve mechanism 40a opens first because the predetermined temperature of the first sub-valve mechanism 40a is set to the highest temperature among the two sub-valve mechanisms 40. Therefore, the valve hole 43 of the first sub-valve mechanism 40a is closest to the inlet 21, so the drainage that has flowed in from the inlet 21 can be quickly discharged into the sub-discharge path 25. Therefore, the drainage can be effectively discharged.

In addition, in the drain trap 100 of the above embodiment, the secondary drain passage 25 further includes an eighth flow passage 258 (communication passage) that communicates with the downstream end of the fifth flow passage 255 and the main drain passage 24.

According to the above configuration, a relatively large amount of drain flows in the main discharge passage 24, and therefore the flow rate of the drain is high. Therefore, the drain in the eighth flow passage 258 is sucked into the main discharge passage 24 by the flow of the drain in the main discharge passage 24. Accordingly, the flow of the drain in the fifth flow passage 255 is promoted. Therefore, the decrease in the discharge capacity (discharge flow rate) in the secondary discharge passage 25 can be further suppressed.
Other Embodiments
The technology disclosed in the present application may be configured as follows with respect to the above-described embodiment.

For example, in the drain trap 100 of the above embodiment, the fifth flow path 255 connects two vertical flow paths, the first flow path 251 and the second flow path 252, but it may connect three of the four vertical flow paths, the first flow path 251 to the fourth flow path 254, or it may connect all four vertical flow paths, the first flow path 251 to the fourth flow path 254. In other words, the technology disclosed in this application requires that the number of vertical flow paths connected to one horizontal flow path be two or more.

In addition, in the drain trap 100 of the above embodiment, the sixth flow path 256 and the seventh flow path 257 may be omitted, and a common lateral flow path to which the third flow path 253 and the fourth flow path 254 are connected may be provided.

In the drain trap 100 of the above embodiment, the second flow path 252 and the fifth flow path 255 may be joined at an acute angle toward each other's downstream side. By doing so, it is possible to suppress a decrease in flow rate caused by the collision (joining) of the drain of the fifth flow path 255 flowing from the first flow path 251 with the drain of the second flow path 252.

In addition, in the drain trap 100 of the above embodiment, the number of auxiliary valve mechanisms 40 is not limited to four, but may be two, three, five or more.

In addition, in the drain trap 100 of the above embodiment, the main valve mechanism 30 may be omitted.

The technology disclosed in this application is useful for drain traps.

100 Drain trap (valve device)
10 Casing 21 Inlet 22 Storage chamber 23 Outlet 24 Main discharge passage 25 Sub-discharge passage (discharge passage)
30 Main valve mechanism 31 Valve body (float)
33 Valve hole 40 Sub-valve mechanism (valve mechanism)
40a First sub-valve mechanism (sub-valve mechanism)
40b Second sub-valve mechanism (sub-valve mechanism)
40c Third sub-valve mechanism (sub-valve mechanism)
40d Fourth sub-valve mechanism (sub-valve mechanism)
41 Valve body 43 Valve hole 251 First flow path (vertical flow path)
252 Second flow path (vertical flow path)
255 Fifth flow path (lateral flow path)
258 8th flow path (connection path)

Claims (3)

a casing having a drain inlet and drain outlet formed therein;
a plurality of valve mechanisms provided within the casing, the valve mechanisms including a valve hole through which the drain that has flowed in from the inlet passes and a valve body that opens and closes the valve hole in response to temperature;
a plurality of vertical flow paths extending vertically from the valve holes of each of the plurality of valve mechanisms; a horizontal flow path in which the vertical flow paths are connected in sequence in the upstream and downstream directions and in which drains from the plurality of vertical flow paths join; and a discharge path that leads the joined drains of the horizontal flow paths to the outlet,
The lateral flow passage is inclined downward toward the downstream side ,
The plurality of valve mechanisms are configured such that the valve body opens the valve hole when the temperature of the valve body drops to a predetermined temperature,
Among the plurality of valve mechanisms, the predetermined temperature of the valve mechanism having the closest distance between the valve hole and the inlet is set to the highest temperature.
A drain trap characterized by: 2. The drain trap according to claim 1 ,
The casing is formed with a storage chamber in which the drain that flows in from the inlet is stored,
a main valve mechanism including a main valve hole provided at a lower portion of the storage chamber and through which the drain of the storage chamber passes, and a float accommodated in the storage chamber and configured to open and close the main valve hole;
a main discharge passage communicating with the main valve hole and directing the drain that has passed through the main valve hole to the outlet,
The valve mechanism is a sub-valve mechanism in which the valve hole is provided in an upper portion of the storage chamber and the drain of the storage chamber passes through the valve hole,
A drain trap characterized in that the discharge passage is a secondary discharge passage. 3. The drain trap according to claim 2 ,
The drain trap according to claim 1, wherein the discharge passage further includes a communication passage that communicates with a downstream end of the lateral passage and the main discharge passage.

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