JP5794653B1 - steam trap - Google Patents

Abstract

A steam trap is provided which is not easily blocked and easily follows a change in drain amount. A steam trap 20 is provided. In the steam trap 20, the path length of the orifice hole 33 is relatively short and the internal space 34 is relatively wide, and the path length of the tunnel hole 43 as the orifice hole is relatively long and the internal space 44 is relatively long. A narrow tunnel member 40, and an orifice member 30 and a casing 50 for accommodating the tunnel member 40. The inner diameter of the tunnel hole 43 serving as the orifice hole of the tunnel member 40 is preferably set so that a capillary phenomenon occurs in the inflowing drain. [Selection] Figure 1

Description

  The present invention relates to a steam trap for discharging drain generated by being attached to a steam-using device or a steam piping system.

  Conventionally, so-called steam traps for automatically discharging the generated drain have been used in steam-using equipment and steam piping systems. As a steam trap, a float type that opens and closes a valve by detecting a specific gravity difference between steam and drain by a float, and a disk type that utilizes a difference in thermodynamic characteristics between steam and drain have been used. Furthermore, an orifice type steam trap has been used as a relatively simple structure with a small number of parts.

  For example, Patent Document 1 discloses a steam trap that discharges drain to the outside with a small-diameter orifice, a drain inflow pipe connected to the steam trap, an ejector member connected to a branch passage of the drain inflow pipe, There is disclosed a steam trap device including an orifice communication passage that communicates a suction chamber of an ejector member and an orifice inlet side.

Japanese Patent Laid-Open No. 4-95694

  By the way, in the conventional orifice type steam trap disclosed in Patent Document 1, when the float type or disk type is replaced with the orifice type, the accumulated foreign matter flows all at once, thereby closing the orifice hole. There was a case. Furthermore, it has been found that with a conventional orifice type steam trap, the steam leakage gradually increases as the drain amount decreases. Therefore, a steam strap that can easily follow the change in the drain amount is desired.

  Therefore, an object of the present invention is to provide a steam trap that is not easily blocked and easily follows a change in the drain amount.

  In order to achieve the above-mentioned object, the steam trap of the present invention has an orifice member having a relatively short path length of the orifice hole and a relatively wide internal space, and a relatively long path length of the orifice hole and a relatively large internal space. A narrow tunnel member, and a casing for accommodating the orifice member and the tunnel member.

  As described above, the steam trap of the present invention includes an orifice member having a relatively short path length of the orifice hole and a relatively wide internal space, and a tunnel having a relatively long path length of the orifice hole and a relatively narrow internal space. A member, and a casing that houses the orifice member and the tunnel member. With such a configuration, a labyrinth effect and a deceleration effect are produced, so that the steam trap is less likely to block and easily follow the change in the drain amount.

It is a side view of the whole steam trap apparatus. 1 is a cross-sectional view of a steam trap of Example 1. FIG. It is sectional drawing of the steam trap of a modification. It is sectional drawing of a modification steam trap. It is sectional drawing of the orifice member of the steam trap of Example 2. FIG. 6 is a cross-sectional view of an orifice member of a steam trap of Example 3. FIG. It is sectional drawing of the steam trap of other forms. (A) is an example in which three tunnel members are arranged on the downstream side, (b) is an example in which two tunnel members are arranged on the downstream side and one is replaced with an orifice member, and (c) is a tunnel member and This is an example in which orifice members are alternately arranged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Constitution)
First, the whole structure of the steam trap apparatus 1 provided with the steam trap 2 of this invention is demonstrated using FIG. As shown in FIG. 1, the steam trap device 1 according to this embodiment includes a Y-type strainer 10 and a steam trap 20.

  The Y-type strainer 10 includes a drain inlet 11, a drain outlet 12, a branch port 13, and a cylindrical filter 14 having both ends connected to the drain inlet 11 and the branch port 13. The cylindrical filter 14 has a large number of small holes when the filter is stretched on a cylindrical side surface.

  Further, an on-off valve 15 such as a ball valve is connected to the branch port 13 of the Y-type strainer 10. This on-off valve 15 is normally closed. The drain flows into the cylindrical filter 14 from the drain inlet 11 and exits from the small hole of the filter to the hollow portion in the Y-type strainer 10. At this time, foreign matters such as iron powder and rust contained in the drain are captured by the filter. The drain from which foreign matter has been removed in this manner is discharged from the hollow portion of the Y-type strainer 10 through the outlet 13.

  Further, when the pressure of the drain flowing into the cylindrical filter 14 through the drain inlet 11 is high, some foreign matter contained in the drain penetrates the filter and hollows the Y-strainer 10 together with the drain. Go out to the department.

  Then, a socket with a female thread for connecting the upstream pipe is attached to the drain inlet 11 of the Y-type strainer 10. Similarly, a socket with a female thread for connecting an orifice type steam trap 20 is attached to the drain outlet 12.

  As shown in FIG. 2, the steam trap 20 of this embodiment has a relatively short orifice hole path length and a relatively wide internal space, and a relatively long orifice hole path length. A tunnel member 40 having a relatively narrow internal space, and a casing 50 that accommodates the orifice member 30 and the tunnel member 40 are provided.

  The casing 50 is formed in a substantially cylindrical shape with metal or the like, and the front end 51 and the rear end 52 are open. The inner diameter of the circular opening at the tip 51 is narrowed to be smaller than the outer diameters of the orifice member 30 and the tunnel member 40. The inner diameter of the circular opening at the rear end 52 is larger than the outer diameters of the orifice member 30 and the tunnel member 40. A thread groove is threaded near the rear end 52 of the inner surface of the casing 50. The casing 50 accommodates the orifice member 30, the tunnel member 40, the orifice member 30, the tunnel member 40, and the orifice member 30 in order from the tip 51 close to the Y-shaped strainer 10.

  The orifice member 30 is surrounded by a cylindrical portion 31 that constitutes a cylinder, a distal end portion 32 that closes the distal end of the cylindrical portion 31, an orifice hole 33 provided in the central portion of the distal end portion 32, and the cylindrical portion 31 and the distal end portion 32. And an internal space 34. The orifice hole 33 is formed so as to penetrate a truncated cone (cone with the tip cut off) protruding from the center of the tip end portion 32 and linearly expands from the tip 51 toward the rear end 52. Formed.

  The tunnel member 40 is surrounded by a cylindrical portion 41 that forms a cylinder, a distal end portion 42 that closes the distal end of the cylindrical portion 41, a tunnel hole 43 provided in the center of the distal end portion 42, and the cylindrical portion 41 and the distal end portion 42. And an internal space 44 formed. The tunnel hole 43 is formed so as to penetrate the center of the front end portion 42, and is formed so as to have the same diameter (having a constant inner diameter) from the front end 51 toward the rear end 52. The inner diameter of the tunnel hole 43 is preferably set so that capillarity occurs in the inflowing drain. The inner diameter of the tunnel hole 43 is not limited, but is preferably in a range of 11 mm or less in diameter in order to surely generate a capillary phenomenon (blockage of the tunnel hole 43 by liquid drain). As described above, the drain capillary phenomenon in the tunnel member 40 has two effects, that is, a steam leakage preventing effect due to the airtight holding by the drain and a constant flow rate holding effect due to the differential pressure between the inlet and the outlet.

  Here, the length of the cylindrical portion 31 of the orifice member 30 is longer than the length of the cylindrical portion 41 of the tunnel member 40. In other words, the thickness of the tip portion 32 of the orifice member 30 is smaller than the thickness of the tip portion 42 of the tunnel member 40. Therefore, the path length of the orifice hole 33 is shorter than the path length of the tunnel hole 43, and the internal space 34 of the orifice member 30 is wider than the internal space of the tunnel member 40.

  Next, a modified example of the steam trap 20A will be described with reference to FIG. The steam trap 20 </ b> A differs from the steam trap 20 described above in the arrangement order of the orifice member 30 and the tunnel member 40. Specifically, the casing 50 accommodates the orifice member 30, the orifice member 30, the orifice member 30, and the tunnel member 40 </ b> A in order from the tip 51 close to the Y-strainer 10. That is, the length of the tunnel member 40 </ b> A of this modification is twice the length of the tunnel member 40 described above. Accordingly, the total path length of the tunnel members 40, 40 of the steam trap 20 and the path length of the tunnel member 40A of the steam trap 20A of this modification are substantially the same length.

  Next, a modified example of the steam trap 20B will be described with reference to FIG. The steam trap 20B is different from the steam traps 20 and 20A described above in the order in which the orifice member 30 and the tunnel member 40 are arranged. Specifically, the casing 50 accommodates the orifice member 30, the tunnel member 40, the orifice member 30, and the tunnel member 40 </ b> A in order from the tip 51 close to the Y-strainer 10. That is, the length of the tunnel member 40 </ b> A of this modification is twice the length of the tunnel member 40 described above. Therefore, the path length of the tunnel member 40A of the steam trap 20B of this modification is longer by one tunnel member 40 than the total path length of the tunnel members 40, 40 of the steam trap 20 described above. In this way, the flow velocity can be adjusted according to the length of the tunnel member 40.

(Action / Effect)
Next, actions and effects exhibited by the steam trap 20 (20A, 20B) of the present embodiment and the modification will be listed and described.

(1) As described above, in the steam trap 20 of this embodiment, the path length of the orifice hole 33 is relatively short and the internal space 34 is relatively wide, and the path length of the tunnel hole 43 as the orifice hole. The tunnel member 40 is relatively long and the internal space 44 is relatively narrow, and the casing 50 that accommodates the orifice member 30 and the tunnel member 40 is provided. With such a configuration, a labyrinth effect and a deceleration effect are produced, so that the steam trap 20 is less likely to block and easily follow the change in the drain amount. That is, a large pressure reduction effect (labyrinth effect) can be obtained by arranging a plurality of orifice pieces (orifice member 30 and tunnel member 40) in series. In other words, since the flow velocity of the vapor (gas) is several tens of times faster than that of the drain (liquid), the flow velocity of the vapor (gas) is reduced by the drain (liquid) due to the capillary phenomenon generated in the tunnel hole 43, so that The pressure reducing effect in the internal space 34 is increased. Thus, the combination of the orifice member 30 and the tunnel member 40 can make the orifice member 30 have a hole diameter that is difficult to close. Thus, the larger the number of combinations of the orifice member 30 and the tunnel member 40, the larger the orifice diameter.

  That is, the drain that exits the orifice hole 33 adiabatically expands in the internal space 34 (and the internal space 44) created between the next tunnel member 40 (or the orifice member 30), and the pressure is reduced. The part turns into steam again. Therefore, it becomes more difficult to pass through the next tunnel member 40 (labyrinth effect).

  Furthermore, although the drain flows in the tunnel hole 43 due to capillary action due to the surface tension action, the slow-flowing drain flows with the cross-section closed, so the passage speed of the vapor expanded several hundred times is also slow. Become. Therefore, the amount of leaked steam is extremely small in terms of weight (drain seal effect).

  In other words, the diameter of the orifice hole 33 can be increased by enhancing the labyrinth effect and the drain seal effect. By enlarging the hole diameter of the orifice hole 33 in this manner, the orifice hole 33 (tunnel hole 43) is less likely to be blocked, and the followability of load fluctuations with respect to the discharge capacity is increased. Specifically, while leakage has conventionally occurred at a load factor of 50% or less, in the present invention, leakage occurs only at a load factor of approximately 35% or less. In other words, in the conventional type, the entrained steam amount could not be measured up to 50% load (drain) of the drain discharge amount possessed by the orifice, but by the combination of the orifice member 30 and the tunnel member 40, the entrained steam amount was 30%. The amount of steam cannot be measured. That is, the corresponding range of the orifice trap is greatly expanded.

The conventional type (intermittent type) has a service life of 4 to 5 years, but has been proven to have a tunnel effect of 20 years or more (no SUS-made erosion), and it has great power in reducing CO ₂ emissions. Is demonstrated.

(2) The inner diameter of the tunnel hole 43 serving as the orifice hole of the tunnel member 40 is set so that a capillary phenomenon occurs in the inflowing drain. In other words, the drain seal effect is achieved by making the cross section of the tunnel hole 43 closed by the inflowing drain.

(3) A plurality of orifice members 30 and tunnel members 40 are provided, and the orifice members 30 and the tunnel members 40 are alternately accommodated in the casing 50, so that the pressure can be reduced while reducing the flow rate of the drain. Thereby, a synergistic effect of the drain seal effect and the labyrinth effect can be generated. In other words, in order to obtain the same level of drain seal effect, the hole diameters of the orifice hole 33 and the tunnel hole 43 can be made larger than before.

  In addition, since the orifice member 30 and the tunnel member 40 are each formed as a piece (a replaceable small part), the arrangement order of the orifice member 30 and the tunnel member 40 is appropriately adjusted, or the tunnel member 40 is replaced by a tunnel. By arranging the member 40, the ratio between the labyrinth effect and the drain seal effect (particularly the deceleration effect) can be adjusted. This facilitates achieving optimal member placement for each system. For example, by arranging three orifice members 30 and then arranging the tunnel member 40, the number of locations where the labyrinth effect is generated can be reduced from five to four. In addition, by doubling the length of the second tunnel member 40A instead of the first orifice member 30 from the rear end 52, the number of places where the labyrinth effect is generated can be reduced from five to four. it can. In this case, the speed reduction effect can be further increased by further increasing the length of the tunnel hole 43 by 1.5 times.

  Hereinafter, an orifice member 30A having a form different from that of the first embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  Similar to the orifice member 30 of the first embodiment, the orifice member 30 </ b> A of the present embodiment includes a cylindrical portion 31, a tip portion 32, an orifice hole 33, and an internal space 34. And the helical groove | channel 35 is formed in the inner surface of the cylinder part 31 of a present Example, as shown in FIG. The spiral groove 35 is formed to move in the axial direction perpendicular to the rotation surface while rotating around the central axis of the orifice member 30A.

  As described above, the spiral groove 35 is formed on the inner surface of the cylindrical portion 31 of the orifice member 30A of the present embodiment, so that the rotational speed of the drain and steam flowing into the internal space 34 from the orifice hole 33 is increased. Ingredients can be generated. This further reduces the speed of drain and steam.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus the description thereof is omitted.

  Hereinafter, an orifice member 30B having a form different from those of the first and second embodiments will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  Similarly to the orifice members 30 and 30A of the first and second embodiments, the orifice member 30B of the present embodiment includes a cylindrical portion 31, a tip portion 32, an orifice hole 33A, and an internal space 34. The orifice hole 33A of this embodiment is formed such that the inner diameter changes (expands) in at least two stages from the front end 51 toward the rear end 52. Specifically, as shown in FIG. 6, the hole diameter of the orifice hole 33A is formed to change in three stages. That is, the inclination at the tip of the orifice hole 33A is minimum, the inclination at the rear end is maximum, and the intermediate portion has an intermediate inclination. In other words, the orifice hole 33 </ b> A is configured to expand toward the end while changing the inclination in two stages from the tip toward the internal space 34.

  In this way, the orifice hole 33A is formed so that the inner diameter changes in at least two stages, so that the diameter of the orifice hole 33A increases toward the back of the orifice hole 33A, so that the labyrinth effect is more efficiently generated. Can be made. That is, the drain that has entered from the orifice hole 33A is adiabatically expanded in the internal space 34 formed between the next tunnel member or the orifice member and the pressure is reduced, and a part of the drain is changed to steam again. Therefore, it becomes difficult to pass through the next tunnel member or orifice member (labyrinth effect).

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus the description thereof is omitted.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to the present invention. included.

  For example, the number of orifice members 30 and tunnel members 40 is not limited to a total of five as in the embodiment, but may be a total of four or less, or a total of six or more. In the case of a total of six, it can arrange as shown to Fig.7 (a)-(c).

  FIG. 7A shows an example in which three tunnel members 40 are arranged on the downstream side. That is, the orifice member 30, the orifice member 30, the orifice member 30, the tunnel member 40, the tunnel member 40, and the tunnel member 40 are arranged in this order from the upstream side.

  FIG. 7B shows an example in which two of the tunnel members 40 are exchanged on the downstream side and one is replaced with an orifice member. That is, the orifice member 30, the orifice member 30, the tunnel member 40, the orifice member 30, the tunnel member 40, and the tunnel member 40 are arranged in this order from the upstream side.

  FIG. 7C shows an example in which the tunnel members 40 and the orifice members 30 are alternately arranged. That is, the orifice member 30, the tunnel member 40, the orifice member 30, the tunnel member 40, the orifice member 30, and the tunnel member 40 are arranged in this order from the upstream side.

DESCRIPTION OF SYMBOLS 1 Steam trap apparatus 10 Y type strainer 11 Drain inlet 12 Drain outlet 13 Branch port 14 Cylindrical filter 15 On-off valve 20, 20A, 20B Steam trap 30, 30A, 30B Orifice member 33, 33A Orifice hole 34 Internal space 40, 40A Tunnel member 43 Tunnel hole 44 Internal space 50 Casing

Claims (5)

A steam trap,
An orifice member having a relatively short path length of the orifice hole and a relatively wide internal space;
A tunnel member having a relatively long path length of the orifice hole and a relatively narrow internal space;
A steam trap, comprising: a casing that accommodates the orifice member and the tunnel member in series .   2. The steam trap according to claim 1, wherein an inner diameter of an orifice hole of the tunnel member is set so that a capillary phenomenon occurs in an inflowing drain. A plurality of each of the orifice member and the tunnel member,
The steam trap according to claim 1 or 2, wherein the orifice member and the tunnel member are alternately accommodated in the casing.   The steam trap according to any one of claims 1 to 3, wherein a spiral groove is formed in an internal space of the orifice member. The steam trap according to any one of claims 1 to 4, wherein the orifice hole of the orifice member is formed so that an inner diameter thereof changes in at least two stages.