Drain trap

Abstract

The drain trap 1 comprises a casing 2 having an inlet passage 5 for drain 4 and a storage chamber 7 communicating with the inlet passage 5; a valve mechanism 10 having a valve hole 12 formed in the storage chamber 7, a valve body 13 for opening and closing the valve hole 12, and a float 15 with a lever 16 for opening and closing the valve body 13; and a regulating plate 20 for restricting the flow of drain 4. The regulating plate 20 is located between the end of the inlet passage 5 in the storage chamber 7 and the float 15, and has a float protection wall 21 that prevents the drain 4 flowing in from the first end 5a from colliding with the float 15.

Description

Technical Field

[0001] The technology of the present disclosure relates to a drain trap.

Background Art

[0002] For example, Patent Document 1 below discloses a float-type drain trap. This drain trap receives a gas-liquid mixture of compressed air and drain from an inlet at the upper part of the cover, separates the drain, and discharges the drain from a discharge port provided at the lower part of the side wall.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the drain trap as described above, the inflowing drain is likely to directly hit the float. Therefore, when the flow rate of the drain is large, the drain may act on the float or the lever connected thereto, which may cause a failure. In particular, damage may occur at the connection portion between the float and the lever due to the impact, and improvement has been demanded.

[0005] The technology of the present disclosure has been devised in view of the above actual situation, and the main problem is to provide a drain trap that can suppress damage to the float and the lever caused by the drain.

Means for Solving the Problems

[0006] The drain trap of this disclosure comprises a casing having a drain inlet and a storage chamber communicating with the inlet; a valve mechanism having a valve hole formed in the storage chamber, a valve body for opening and closing the valve hole, and a float with a lever disposed in the storage chamber for opening and closing the valve body; and a regulating plate disposed in the storage chamber for restricting the flow of the drain, wherein the regulating plate is located between the end of the inlet in the storage chamber and the float, and has a float protection wall that prevents the drain flowing in from the end from colliding with the float. [Effects of the Invention]

[0007] By adopting the above-described features, the drain trap of this disclosure can effectively suppress damage to the float and lever caused by drain. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view showing the closed valve state of the drain trap in this embodiment. [Figure 2] Figure 1 is a cross-sectional view showing the open state of the drain trap. [Figure 3] This is a perspective view showing the regulatory plate of this embodiment. [Figure 4] This is an enlarged view of the upper wall portion of the regulatory plate shown in Figure 3, viewed from above. [Figure 5] Figure 3 is a side view of the regulatory plate. [Modes for carrying out the invention]

[0009] One embodiment of this disclosure will be described below with reference to the drawings. The drawings contain the features of this disclosure, but may include exaggerations or representations that differ from the actual structural dimensional ratios in order to aid in understanding this disclosure. In addition, the same reference numerals are used for elements that are the same or common throughout each embodiment, and redundant explanations are omitted. In addition, well-known configurations may be used as appropriate for configurations not described herein.

[0010] Figure 1 is a cross-sectional view showing the internal structure of the drain trap 1. In Figure 1, the vertical direction is the Z-axis direction, the horizontal direction perpendicular to the Z-axis direction is the X-axis direction, and the direction perpendicular to the Z-axis direction and the X-axis direction is the Y-axis direction. In each figure, these directions are indicated by arrows to aid in understanding this disclosure. Furthermore, in this specification, a virtual plane extending parallel to the X-axis and Y-axis directions may be referred to as the XY plane, a virtual plane extending parallel to the X-axis and Z-axis directions may be referred to as the XZ plane, and a virtual plane extending parallel to the Y-axis and Z-axis directions may be referred to as the YZ plane.

[0011] As shown in Figure 1, the drain trap 1 is a device for discharging steam, compressed air, or condensed water from gas, and is designed to separate and discharge only the condensed water while minimizing the escape of the steam, etc. The drain trap 1 of this embodiment is used, for example, as a steam trap connected to a piping system for steam transfer installed in an industrial plant. However, the drain trap 1 of this disclosure is not limited to this form and may also be used as an air trap that discharges condensed water while preventing the discharge of air, or as a gas trap that discharges condensed water while preventing the discharge of gas.

[0012] The drain trap 1 comprises a casing 2 including a main body 2a and a lid 2b. In this embodiment, hanging brackets and bolts are provided on the upper part of the lid 2b, but in each figure, their side view is shown rather than their cross-sectional shape. Similarly, for components that do not require a cross-sectional shape to be shown, such as the float 15 described later, the side view is shown. The casing 2 has a flow path 3 through which the drain 4 flows. The flow path 3 includes an inlet passage 5 into which the drain 4 flows and an outlet passage 6 into which the drain 4 flows out. The inlet passage 5 and the outlet passage 6 are each provided in the main body 2a of the casing 2. The flow path 3 also includes a storage chamber 7 that communicates with the inlet passage 5. The storage chamber 7 also communicates with the outlet passage 6. When the drain trap 1 of this embodiment is used, the drain 4 flows into the inlet passage 5 (see arrow A1). Furthermore, drain 4 gradually accumulates in the storage chamber 7, and the accumulated drain 4 is appropriately discharged from the outflow passage 6 by opening and closing the valve mechanism 10, which will be explained below (see arrow A2). Figure 1 shows the closed state of the drain trap 1.

[0013] In this embodiment, the inlet passage 5 extends in the X-axis direction. When the drain trap 1 is in use, not only drain 4 but also steam may flow into the inlet passage 5. From the viewpoint of quickly replacing the drain 4 or steam with the gas in the storage chamber 7, the inlet passage 5 in this embodiment is connected to the storage chamber 7 via a first end 5a for drain inflow and a second end 5b provided at a higher position than the first end 5a. The second end 5b can also play a role in releasing the gas in the storage chamber 7 as drain 4 flows in from the first end 5a. The first end 5a opens to the storage chamber 7 with an area sufficiently larger than that of the second end 5b. Furthermore, the lower end of the opening edge of the first end 5a relative to the storage chamber 7 and the bottom of the storage chamber 7 are substantially at the same vertical position. This allows drain 4 to quickly flow into the storage chamber 7 from the first end 5a. However, the inlet passage 5 of this disclosure is not limited to this configuration.

[0014] The outflow passage 6 extends, for example, in the X-axis direction. Downstream of the outflow passage 6, for example, another pipe (not shown) is connected and opens to the outside. In another embodiment, a device that utilizes the latent heat of the drain 4 may be provided downstream of the outflow passage 6 (not shown).

[0015] A valve mechanism 10 is provided in the storage chamber 7. The valve mechanism 10 opens and closes the connection between the storage chamber 7 and the outflow passage 6. The valve mechanism 10 includes a valve case 11 with a valve hole 12 formed therein for the outflow passage 6, a valve body 13 that opens and closes the valve hole 12, and a driver 14 that drives the valve body 13.

[0016] The drive unit 14 includes a float 15 with a lever 16. The float 15 is formed, for example, as a hollow sphere with a hollow interior, and is able to float relative to the drain 4. The float 15 and lever 16 are, for example, made of metal and are connected by welding. The lever 16 is rotatably supported on a shaft provided in the storage chamber 7. The lever 16 swings about the shaft as the float 15 rises and falls. A valve body 13 is connected to the end of the lever 16. As a result, the drive unit 14 moves the valve body 13 up and down according to the drain water level in the storage chamber 7, opening and closing the valve hole 12. Specifically, when the drain water level is low, the position of the float 15 becomes relatively low, the lever 16 raises the valve body 13, and the valve hole 12 closes. Therefore, as long as there is little drain 4 stored in the storage chamber 7, the valve hole 12 remains closed, and the drain continues to be stored in the storage chamber 7.

[0017] Figure 2 is a cross-sectional view of the drain trap 1 in the open state. As shown in Figure 2, when the drain water level in the storage chamber 7 rises, the position of the float 15 rises accordingly, causing the valve body 13 to descend by the lever 16 and the valve hole 12 to open. As a result, the drain 4 in the storage chamber 7 moves toward the outflow passage 6 and the drain 4 is discharged.

[0018] As shown in FIG. 1, in the drain trap 1 in the closed valve state, a part of the float 15 faces the first end 5a of the inflow path 5. Conventionally, when the inflow path 5 and the float 15 are in such a positional relationship, the incoming drain 4 is likely to directly hit the float 15. For this reason, when the flow velocity of the drain 4 is large, an impact acts on the float 15 and the lever 16, which may cause a failure. In particular, due to the impact, damage may occur at the connection portion between the float 15 and the lever 16, and improvement has been demanded.

[0019] In contrast, the storage chamber 7 of the present disclosure is provided with a regulation plate 20 for regulating the flow of the drain 4. This regulation plate 20 is disposed between the float 15 and the inner wall 7i of the storage chamber 7. The inner wall 7i means the surface forming the space of the storage chamber 7, and any of the ceiling surface 7u, the bottom surface 7d, and the side wall 7s of the storage chamber 7 is included in the inner wall 7i. Note that the regulation plate 20 of the present embodiment is provided between the bottom surface 7d of the storage chamber 7 and the float 15.

[0020] FIG. 3 shows an enlarged perspective view of this regulation plate 20. As shown in FIGS. 1 and 3, the regulation plate 20 includes a float protection wall 21. The float protection wall 21 is located between the first end 5a of the inflow path 5 and the float 15, and inhibits the collision of the drain 4 flowing in from the first end 5a against the float 15. Thereby, the drain 4 flowing into the storage chamber 7 contacts the float protection wall 21 and its flow velocity is reduced, preventing an impact from acting on the float 15 and the lever 16. Therefore, damage to the float 15 and the lever 16 caused by the drain 4 can be effectively suppressed. Note that the first end 5a is an example of the end of the inflow path 5 in the storage chamber 7.

[0021] The following describes the more detailed configuration of the present embodiment. Each configuration described below shows a specific aspect of the present embodiment. Therefore, it is needless to say that the present disclosure can exhibit the above-described effects even if it does not have the configurations described below. Further, even if any one of the configurations described below is applied alone to the drain trap 1 of the present disclosure having the above-described features, an improvement in performance corresponding to each configuration can be expected. Furthermore, when several of the configurations described below are applied in combination, a combined improvement in performance corresponding to each configuration can be expected.

[0022] As shown in FIG. 3, the restricting plate 20 of the present embodiment is formed of, for example, a stainless steel plate material. The thickness t1 of the plate material is, for example, 2.0 to 5.0 mm. Note that the numerical range of various parameters described in this specification is not limited to this thickness t1, and unless otherwise specified, it means the numerical range for the average of the parameters. Further, the average means dividing the measurement target into a plurality of minute regions of a proper size, measuring the corresponding parameter for each minute region, and dividing the sum of the parameters of each minute region obtained by the number of divided minute regions.

[0023] The restricting plate 20 does not have minute holes for filtering the drain 4. That is, the restricting plate 20 of the present embodiment is different from the strainer, filter, and screen provided in a conventional drain trap.

[0024] As shown in FIG. 1, the restricting plate 20 of the present embodiment is disposed between the first end portion 5a and the float 15, and is not disposed between the second end portion 5b and the float 15. Thereby, the entry and exit of steam and gas at the second end portion 5b are not inhibited by the restricting plate 20, and the gas in the storage chamber 7 is easily replaced with the drain 4 or steam. By this action, the rippling of the liquid level of the drain 4 in the storage chamber 7 is suppressed, and the float 15 easily strokes as designed. Note that the restricting plate 20 of the present disclosure is not limited to such an aspect, and for example, the restricting plate 20 may also be disposed between the second end portion 5b and the float 15.

[0025] The float protection wall 21 is positioned to cover the float 15 so that the drain 4 flowing in from the first end 5a of the inflow passage 5 does not directly hit the float 15. Furthermore, the outer edge of the float protection wall 21 is spaced apart from the inner wall 7i of the storage chamber 7 so that the drain 4 that comes into contact with the float protection wall 21 is quickly guided to the bottom of the storage chamber 7. From the viewpoint of more reliably suppressing damage to the float 15 and lever 16, it is desirable that the outer surface area of ​​the float protection wall 21 be 50% or more of the opening area in the storage chamber 7 at the first end 5a of the inflow passage 5.

[0026] As shown in Figure 3, the float protection wall 21 includes an upper wall portion 25 and a main wall portion 30. At least a portion of the upper wall portion 25 faces the direction of inflow of the drain 4 from the first end portion 5a. Here, "facing" means that the outer surface of the upper wall portion 25 extends in a direction that reduces the flow velocity of the drain 4, and is not limited to a configuration in which the outer surface is perpendicular to the inflow direction of the drain 4. In this embodiment, the upper wall portion 25 has an outer surface 25s that extends along the vertical direction (Z-axis direction). In this specification, when it is described that "a certain outer surface extends along a specific direction (or surface)", it includes a configuration in which the angle between the certain outer surface and the specific direction (or surface) is 10° or less, and preferably includes a configuration in which the angle is 5° or less. The main wall portion 30 is connected to the lower end of the upper wall portion 25 and extends inclined with respect to the vertical direction so as it goes downwards it approaches the float 5. The main wall portion 30 is inclined downward in the direction away from the upper wall portion 25. As a result, the angle between the outer surface 25s of the upper wall portion 25 and the outer surface 30s of the main wall portion 30 is obtuse.

[0027] Figure 4 shows an enlarged view of the upper wall portion 25 as seen from above. In Figure 4, the contour 15a of the float 15 at the same height as the upper surface 25u of the upper wall portion 25 is partially shown. Also, in Figure 4, the main body wall portion 30 (shown in Figure 3) is omitted.

[0028] As shown in Figures 3 and 4, in a top view of the upper wall portion 25, the upper wall portion 25 is curved to surround the float 15. Also, in the top view, the upper wall portion 25 has a longitudinal direction that intersects with the inflow direction of the drain 4 at the first end 5a of the inflow passage 5. The upper wall portion 25 includes one central wall portion 26 and two side wall portions 27 connected in the longitudinal direction. The central wall portion 26 is located in the center of the longitudinal direction. The two side wall portions 27 are located on both sides of the central wall portion 26 in the longitudinal direction. The central wall portion 26 and the side wall portions 27 are each made of a flat plate material. As shown in Figure 4, it is desirable that the upper wall portion 25 is curved between the central wall portion 26 and the two side wall portions 27 to surround the float 15. Specifically, the central wall portion 26, that is, the outer surface 26s of the central wall portion 26, extends in a direction intersecting the X-axis direction, and preferably parallel to the YZ plane. Each side wall portion 27, that is, the outer surface 27s of each side wall portion 27, extends inclined toward the float 15 side as it moves away from the central wall portion 26 in the Y-axis direction.

[0029] Such an upper wall portion 25 can reduce the momentum of the drain 4 moving in the X-axis direction with the central wall portion 26. Furthermore, the drain 4 that hits the central wall portion 26 moves along the side wall portion 27 and is stored in the storage chamber 7 without impacting the float 15 (see arrow A3). Therefore, by having the above-described shape of the upper wall portion 25, damage to the float 15 can be reliably suppressed. However, the configuration is not limited to this, and the upper wall portion 25 may, for example, be curved in an arc shape or a V shape when viewed from above.

[0030] As shown in Figure 1, the outer surface 26s of the central wall 26 extends substantially parallel to the vertical direction. Here, "substantially parallel" includes cases where the angle of the outer surface 26s with respect to the vertical direction is 5° or less. Such a central wall 26 can reliably reduce the flow velocity of the drain 4. In another embodiment, the outer surface 26s of the central wall 26 may be slightly inclined (for example, 10° or less) with respect to the vertical direction (Z-axis direction). In this case, it is desirable that the outer surface 26s of the central wall 26 is inclined downwards toward approaching the float 15. This makes it easier for the drain 4 that hits the central wall 26 to be guided downwards toward the bottom of the storage chamber 7.

[0031] As shown in Figure 4, the angle θ1 between the outer surface 26s of the central wall portion 26 and the outer surface 27s of the side wall portion 27 (the angle on the float 15 side) is appropriately determined so that the side wall portion 27 does not move excessively far from the outer surface of the float 15. In this embodiment, the angle θ1 is set to an obtuse angle, for example, 140 to 170°.

[0032] As shown in Figure 1, the upper end 25u of the upper wall portion 25 is located above the first end 5a of the inflow passage 5, and more specifically, it is desirable that it be located above the upper end 9u of the first end 5a. This ensures that the upper wall portion 25 can reliably reduce the force of the drain 4. If the connection portion between the upper wall of the inflow passage 5 and the inner wall 7i of the storage chamber 7 is chamfered to form a curved surface, the center of the curved surface is the upper end 25u.

[0033] If the vertical length of the upper wall portion 25 is excessively long, bending stress is more likely to act on the connection portion between the upper wall portion 25 and the main body wall portion 30 (shown in Figure 4), which may impair the durability of the regulating plate 20. From this viewpoint, the upper end 25u of the upper wall portion 25 is located below, for example, the boundary 2c between the main body portion 2a and the lid 2b of the casing 2, and preferably below the second end portion 5b.

[0034] As shown in Figure 3, the main body wall 30 has a longitudinal direction that extends inclined with respect to the vertical direction and a width direction perpendicular to the longitudinal direction. The main body wall 30 also includes one central main body wall 31 and two side main body wall 32 that are connected in the width direction. The central main body wall 31 is connected to the lower end of the upper wall 25 and extends in the longitudinal direction. The central main body wall 31 is inclined with respect to the vertical direction and inclined downward as it moves away from the central wall 26 of the upper wall 25 toward the float 15. The two side main body wall 32 are connected to both sides of the central main body wall 31 in the width direction and extend inclined with respect to the vertical direction. The main body wall 30 is also curved between the central main body wall 31 and the two side main body wall 32 so as to surround the float 15.

[0035] Figure 5 shows a side view of the regulating plate 20. As shown in Figure 5, the main body wall portion 30 of the float protection wall 21 has the above-described features, so that the drain 4 that hits the main body central wall portion 31 (shown in Figure 3) or the main body side wall portion 32 is smoothly guided downward and stored in the storage chamber 7 without causing any impact on the float 15 (see arrow A4).

[0036] As shown in Figure 3, the angle between the outer surface 31s of the central wall portion 31 and the outer surface 32s of the side wall portion 32 is smaller than, for example, the angle θ1 (shown in Figure 4) between the central wall portion 26 and the side wall portion 27 in the upper wall portion 25, and is set to, for example, 135 to 165°. This makes it easier for the drain 4 that hits the upper wall portion 25 to be guided downward.

[0037] It goes without saying that the float protection wall 21 is curved between the central wall portion 26 of the upper wall portion 25 and the central wall portion 31 of the main body, so as to surround the float 15. The angle between the outer surface 26s of the central wall portion 26 and the outer surface 31s of the central wall portion 31 of the main body is, for example, 110 to 130°.

[0038] In this embodiment, a gap 34 is formed between the main body side wall 32 and the side wall 27 of the upper wall 25. This reduces the force with which the drain 4 pushes against the float protection wall 21, thereby improving the durability of the float protection wall 21. In another embodiment, the main body side wall 32 and the side wall 27 of the upper wall 25 may be connected. In this embodiment, damage to the float 15 can be suppressed even more reliably.

[0039] In this embodiment, the central wall portion 26 and side wall portions 27 of the upper wall portion 25 of the float protection wall 21, and the central wall portion 31 and side wall portions 32 of the main body wall portion 30, are each made of a plate material with a flat outer surface. This makes it easier to manufacture the regulating plate 20. However, the float protection wall 21 is not limited to this configuration and may have a smooth curved surface that follows the outer surface of the float 15. The regulating plate 20 may be manufactured, for example, by welding together multiple plate materials, or by forging from a single plate material.

[0040] The regulating plate 20 of this embodiment includes a fastening portion 35. The fastening portion 35 is supported by one of the members arranged in the storage chamber 7 (shown in Figure 1). The fastening portion 35 of this embodiment is bolted to the member, but is not limited to this configuration. The fastening portion 35 of this embodiment is bolted to the outer surface of the valve case 11 (shown in Figure 1) included in the valve mechanism 10, for example. As a result, the fastening portion 35 is plate-shaped and extends in the vertical direction. More specifically, the fastening portion 35 is a flat plate-shaped object extending along the YZ plane, and the outer surfaces of the fastening portion 35 face each other in the X-axis direction.

[0041] As the float protection wall 21 is pushed in the X-axis direction by the drain 4, the fastening portion 35 has the above-described characteristics, which makes it easier for the regulating plate 20 to flex in the X-axis direction without local deformation, thereby improving the durability of the regulating plate 20. In another embodiment, for example, if the fastening portion 35 is bolted to the bottom surface 7d of the storage chamber 7 (shown in Figure 1), stress tends to concentrate around the fastening portion 35 due to the drain 4, which may impair the durability of the regulating plate 20.

[0042] The regulating plate 20 includes a base portion 40 connecting the float protection wall 21 and the fastening portion 35. In this embodiment, the base portion 40 includes, for example, a first base plate 41, a second base plate 42, a first curved portion 43, and a second curved portion 44.

[0043] The first base plate 41 is connected to the X-axis end of the float protection wall 21 and has a flat outer surface extending along the XY plane. The first base plate 41 is also an example of a contact portion that contacts the bottom surface 7d of the storage chamber 7 (shown in Figure 1), and in a desirable embodiment, the entire first base plate 41 is in contact with the bottom surface 7d. This prevents the float protection wall 21 from bending downward.

[0044] The second base plate 42 is positioned closer to the fastening portion 35 than the first base plate 41 and has a flat outer surface extending along the XY plane. Furthermore, the entire second base plate 42 is separated from the bottom surface 7d of the storage chamber 7 (shown in Figure 1).

[0045] The first curved portion 43 is provided between the first base plate 41 and the second base plate 42, and connects them. As shown in Figures 3 and 5, in a side view of the regulating plate 20, the first curved portion 43 is curved in an S-shape.

[0046] The second curved portion 44 is provided between the second base plate 42 and the fastening portion 35, and connects them. As shown in Figures 3 and 5, in a side view of the regulating plate 20, the second curved portion 44 is curved in an L-shape.

[0047] The base portion 40 having the above characteristics can flex in a variety of directions compared to the configuration in which the entire base portion is in contact with the bottom surface of the storage chamber 7. Therefore, even if forces in various directions act on the float protection wall 21, the entire regulating plate 20, including the base portion 40, can flex appropriately, preventing stress from concentrating at specific locations. Consequently, the durability of the regulating plate 20 is improved.

[0048] Although particularly preferred embodiments of this disclosure have been described in detail above, this disclosure is not limited to the illustrated embodiments and can be modified and implemented in various ways. [Industrial applicability]

[0049] As explained above, this disclosure is useful as a drain trap. [Explanation of Symbols]

[0050] 2 Casing 4 Drain 5 Inflow channel 7 Storage chamber 10 Valve mechanism 12 valve holes 13 Valve body 16 Lever 15 floats 20 Regulation Plate 21 Float protection wall

Claims

1. A casing having a drain inlet and a storage chamber communicating with the inlet, A valve mechanism comprising a valve hole formed in the storage chamber, a valve body for opening and closing the valve hole, and a float with a lever disposed in the storage chamber for opening and closing the valve body, The storage chamber is equipped with a regulating plate that restricts the flow of the drain, The regulating plate is located between the end of the inflow passage in the storage chamber and the float, and has a float protection wall that prevents the drain flowing in from the end from colliding with the float. The float protection wall includes an upper wall portion facing the direction of drain inflow from the end, and a main wall portion connected to the lower end of the upper wall portion, which is inclined in the vertical direction so as it approaches the float downwards, and extends to a position below the float. In a top view of the upper wall portion, the upper wall portion is curved to surround the float. The upper wall portion has a longitudinal direction extending in a direction intersecting the drain inflow direction at the end, and includes a central wall portion with a flat outer surface provided in the center of the longitudinal direction, and two side wall portions provided on both sides of the central wall portion in the longitudinal direction. The drain trap is characterized in that the upper wall portion is curved between the central wall portion and the two side wall portions so as to surround the float.

2. A drain trap according to claim 1, A drain trap characterized in that the upper end of the upper wall portion is located above the end of the inflow passage.

3. A casing having a drain inlet and a storage chamber communicating with the inlet, A valve mechanism comprising a valve hole formed in the storage chamber, a valve body for opening and closing the valve hole, and a float with a lever disposed in the storage chamber for opening and closing the valve body, The storage chamber is equipped with a regulating plate that restricts the flow of the drain, The regulating plate is located between the end of the inflow passage in the storage chamber and the float, and has a float protection wall that prevents the drain flowing in from the end from colliding with the float. The float protection wall includes an upper wall portion facing the direction of drain inflow from the end, and a main wall portion connected to the lower end of the upper wall portion, which is inclined in the vertical direction so as it approaches the float downwards, and extends to a position below the float. The main body wall portion has a longitudinal direction that extends inclined with respect to the vertical direction and a width direction perpendicular to the longitudinal direction, and includes a central main body wall portion that extends in the longitudinal direction connected to the lower end of the upper wall portion, and two side main body wall portions that are connected to both sides of the central main body wall portion in the width direction. The drain trap is characterized in that the main body wall portion is curved between the central main body wall portion and the two main body side wall portions so as to surround the float.

4. A casing having a drain inlet and a storage chamber communicating with the inlet, A valve mechanism comprising a valve hole formed in the storage chamber, a valve body for opening and closing the valve hole, and a float with a lever disposed in the storage chamber for opening and closing the valve body, The storage chamber is equipped with a regulating plate that restricts the flow of the drain, The regulating plate is located between the end of the inflow passage in the storage chamber and the float, and has a float protection wall that prevents the drain flowing in from the end from colliding with the float. The float protection wall includes an upper wall portion facing the direction of drain inflow from the end, and a main wall portion connected to the lower end of the upper wall portion, which is inclined in the vertical direction so as it approaches the float downwards, and extends to a position below the float. The regulating plate includes a fastening portion supported by any of the members arranged in the storage chamber, The drain trap is characterized in that the fastening portion is plate-shaped and extends in the vertical direction.

5. A casing having a drain inlet and a storage chamber communicating with the inlet, A valve mechanism comprising a valve hole formed in the storage chamber, a valve body for opening and closing the valve hole, and a float with a lever disposed in the storage chamber for opening and closing the valve body, The storage chamber is equipped with a regulating plate that restricts the flow of the drain, The regulating plate is located between the end of the inflow passage in the storage chamber and the float, and has a float protection wall that prevents the drain flowing in from the end from colliding with the float. The float protection wall includes an upper wall portion facing the direction of drain inflow from the end, and a main wall portion connected to the lower end of the upper wall portion, which is inclined in the vertical direction so as it approaches the float downwards, and extends to a position below the float. The drain trap is characterized in that the regulating plate includes a contact portion that contacts the bottom surface of the storage chamber.

6. A drain trap according to any one of claims 3 to 5, A drain trap characterized in that, in a top view of the upper wall portion, the upper wall portion is curved so as to surround the float.

7. A drain trap according to claim 6, The upper wall portion has a longitudinal direction extending in a direction intersecting the drain inflow direction at the end, and includes a central wall portion with a flat outer surface provided in the center of the longitudinal direction, and two side wall portions provided on both sides of the central wall portion in the longitudinal direction. The drain trap is characterized in that the upper wall portion is curved between the central wall portion and the two side wall portions so as to surround the float.

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