JP2010281372A - Steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam trap hardly clogged at all by changing a complete flow passage of condensate, by increasing the combination number of orifices and valve chests in a limited space. <P>SOLUTION: An orifice body 20 is formed by respectively juxtaposing a plurality of blocks 21-23 in the series direction in a state of bringing mutual longitudinal end surfaces into close contact with each other. The plurality of blocks 21-23 have an inside flow passage 20a for turning to the outlet side after introducing fluid in one direction and its inverse direction from the inlet 24 side by circulating the fluid by mutually communicating between the respective blocks 21-23. A combination of orifice flow passages 31-35 of a small diameter cross section and the valve chests 41-44 expanding to its outlet side, is successively formed in a plurality of places along the inside flow passage 20a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a steam trap that automatically discharges steam condensate generated in steam piping systems such as steam transport pipes and steam-using equipment to the outside, and in particular condensate water from a plurality of orifices that are always open. The present invention relates to an orifice type steam trap to be discharged.

As conventional orifice type steam traps, for example, those described in Patent Document 1, Patent Document 2, or Patent Document 3 are known.
These have a basic structure in which a plurality of sets of orifices that are contraction portions and valve chambers that are expansion portions are arranged in series. It was the structure which prevents the penetration of steam to some extent by making it eccentric.

Japanese Utility Model Publication No. 60-2098 JP 2001-27389 A JP 2001-27392 A

  In the conventional orifice type steam trap described above, the orifice and the valve chamber are arranged in series. Therefore, in order to increase the resistance by increasing the number of combinations of the orifice and the valve chamber, there is a gap between the fluid introduction portion and the discharge portion. The distance will be longer. For this reason, there is a problem in that it is contrary to the demand for space saving and is difficult to manufacture.

  As described above, there is a problem in increasing the number of combinations of orifices and valve chambers. As a result, when the differential pressure is high or the amount of condensed water is very small, it is necessary to reduce the cross-sectional area of the orifice. Another problem has arisen that the orifice tends to clog the orifice.

  The present invention has been made paying attention to the problems of the conventional techniques as described above, and increases the number of combinations of orifices and valve chambers in a limited space, and completely changes the flow path of condensed water. The aim is to provide a steam trap that is less clogged.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In a steam trap (10) which includes an orifice body (20) provided in a flow path (12) through which a fluid flows in one direction, and discharges condensed water of steam to the outside by the orifice body (20).
The orifice body (20) is composed of a plurality of blocks (21 to 23) arranged in series in a state where front and rear end surfaces are in close contact with each other,
The plurality of blocks (21 to 23) communicate with each other between the plurality of blocks, and the fluid circulates, and the fluid is circulated from the inlet (24) side to the one direction and vice versa, and then to the outlet side. (20a)
Along with the internal flow path (20a), a combination of orifice flow paths (31 to 35) having a small-diameter cross section and valve chambers (41 to 44) extending to the outlet side thereof are sequentially formed at a plurality of locations. Steam trap (10).

  [2] The steam trap (10) according to [1], wherein the orifice channels (31 to 35) in the internal channel (20a) are eccentric in the center axis before and after series.

  [3] The valve chambers (41 to 44) in the internal flow path (20a) are recessed recesses formed on the front and rear end faces of the block, or recesses formed in an annular shape around the recesses. The steam trap (10) according to [1] or [2], wherein the groove is formed by closing end faces before and after series connection.

[4] The plurality of blocks (21 to 23) includes three blocks, an upper block (21), a middle block (22), and a lower block (23).
The upper block (21) includes an inlet (24) as the concave portion formed in the front end surface, a first valve chamber (41) as the concave groove formed in the rear end surface, and the first valve chamber ( 41) a third valve chamber (43) as the recess formed inside, and a first orifice channel (31) communicating the inlet (24) and the first valve chamber (41). ,
The lower block (23) includes a second valve chamber (42) as the concave groove formed in the front end surface, and a fourth valve chamber as the concave portion formed inside the second valve chamber (42). (44) and a fifth orifice channel (35) communicating with the fourth valve chamber (44) and having an outlet opening at the rear end face thereof,
The middle block (22) includes a second orifice channel (32) communicating the first valve chamber (41) and the second valve chamber (42), the second valve chamber (42) and the second valve chamber (42). A third orifice channel (33) communicating with the three valve chamber (43), and a fourth orifice channel (34) communicating with the third valve chamber (43) and the fourth valve chamber (44). The steam trap (10) according to [3], comprising:

The present invention operates as follows.
According to the steam trap (10) described in [1], each block constituting the orifice body (20) guides the fluid once or repeatedly in one direction from the inlet (24) side and in the opposite direction, and then exits the block. The internal flow path (20a) which goes to the side is provided, and combinations of the orifice flow paths (31 to 35) and the valve chambers (41 to 44) are sequentially formed at a plurality of locations along the internal flow path (20a).

  Thereby, compared with the case where the internal flow path (20a) is linear along the axis, the length of the flow path (12) relative to the entire length of the orifice body (20) can be increased, and the orifice flow path The number of sets of (31-35) and valve chambers (41-44) also increases. Accordingly, it is difficult for the fluid to flow in the orifice body (20). As a result, in the combination of the orifice channels (31 to 35) and the valve chambers (41 to 44) through which the same fluid flows, the sectional area of the orifice can be increased, and clogging due to foreign matters can be prevented.

  Further, the collision in each valve chamber (41 to 44) causes the kinetic energy to be attenuated, and this is larger as the flow velocity is faster. Therefore, the damping effect is higher when there is more steam than when there is more fluid. Therefore, the effect of preventing the steam from being discharged downstream is enhanced.

  According to the steam trap (10) described in the above [2], the central axis of the orifice flow paths (31 to 35) in the internal flow path (20a) is eccentric before and after the series. As a result, the penetration phenomenon is prevented and the pressure energy in the valve chambers (41 to 44) is increased by converting the velocity energy into the pressure energy, thereby preventing the flow of steam from the outlet of the orifice channel (31 to 35). As a result, the leakage of steam to the outside can be reduced.

  According to the steam trap (10) described in [3] above, the valve chambers (41 to 44) in the internal flow path (20a) are recessed recesses formed in the front and rear end faces of the block, or the recesses The groove formed in the shape of a ring that circulates around is closed by end faces before and after the series. Thereby, the complicated internal valve chamber (41-44) which cannot be made with a casting_mold | template can be processed easily.

  The specific steam trap (10) may be configured as described in [4] above, for example. That is, the plurality of blocks (21 to 23) includes three blocks, that is, an upper block (21), a middle block (22), and a lower block (23).

  The upper block (21) includes an inlet (24) as a recess formed in the front end surface, a first valve chamber (41) as a recessed groove formed in the rear end surface, and the first valve chamber (41). A third valve chamber (43) serving as a recess formed inside, and a first orifice channel (31) communicating the inlet (24) and the first valve chamber (41) are provided.

  The lower block (23) includes a second valve chamber (42) as a concave groove formed in the front end surface, and a fourth valve chamber (44) as a concave portion formed inside the second valve chamber (42). And a fifth orifice channel (35) communicating with the fourth valve chamber (44) and having an outlet opening at the rear end face.

  The middle block (22) includes a second orifice channel (32) communicating the first valve chamber (41) and the second valve chamber (42), the second valve chamber (42) and the third valve chamber (42). A third orifice channel (33) communicating with the valve chamber (43), and a fourth orifice channel (34) communicating between the third valve chamber (43) and the fourth valve chamber (44). Prepare.

  Due to the combination of the orifice flow paths (31 to 35) and the valve chambers (41 to 44), the orifice flow paths (31 to 31) are separated at the distance from the inlet (24) to the outlet of the fifth orifice flow path (35). 35) and the valve chambers (41 to 44), the number of the orifice channels that can be provided only about 3 sets by simply decentering the orifice channels is increased to 5 sets, and the length of the orifice channels is also 8/3 times Since it increases so much, fluid becomes difficult to flow.

  According to the steam trap according to the present invention, the number of combinations of orifices and valve chambers is increased in a limited space, and the flow path direction of the trap body can be reduced by enabling a complete flow path change of the condensed water. In addition to being able to be shortened, it is possible to adopt a larger orifice diameter, and as a result, clogging of the orifice with foreign matter is greatly improved.

It is a longitudinal section showing the whole steam trap concerning an embodiment of the invention. It is a longitudinal cross-sectional view which shows the upper stage block of the steam trap which concerns on embodiment of this invention. It is a top view which shows the front-end surface of the upper stage block of the steam trap which concerns on embodiment of this invention. It is a bottom view which shows the rear end surface of the upper stage block of the steam trap which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the lower block of the steam trap which concerns on embodiment of this invention. It is a top view which shows the front end surface of the lower block of the steam trap which concerns on embodiment of this invention. It is a bottom view which shows the rear end surface of the lower block of the steam trap which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the middle block of the steam trap which concerns on embodiment of this invention. It is a top view (bottom view) which shows the front end surface (rear end surface) of the middle stage block of the steam trap which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the whole steam trap which concerns on another embodiment of this invention.

Hereinafter, various embodiments representing the present invention will be described with reference to the drawings.
1 to 9 show a steam trap 10 according to the present embodiment.
FIG. 1 is a longitudinal sectional view of the entire steam trap 10. The steam trap 10 includes an orifice body 20 provided in a flow path 12 of a cylindrical trap casing 11 in which a fluid flows in one direction, and the orifice body 20 automatically discharges steam condensate to the outside. is there.

  The orifice body 20 is formed by arranging a plurality of cylindrical blocks 21 to 23 in series in a state where front and rear end surfaces are in close contact with each other. In the present embodiment, the plurality of blocks 21 to 23 include three blocks: an upper block 21, a middle block 22, and a lower block 23. Note that the orifice body 20 is preferably made of metal.

  The plurality of blocks 21 to 23 communicate with each other between the blocks 21 to 23 so that the fluid circulates, and the internal flow toward the outlet side after guiding the fluid once or repeatedly from the inlet side to the one direction and the opposite direction. A path 20a is provided. Along the internal channel 20a, combinations of orifice channels 31 to 35 having a small-diameter cross section and valve chambers 41 to 45 extending on the outlet side are sequentially formed at a plurality of locations.

  The central axes of the orifice channels 31 to 35 are eccentric before and after the series. Further, each of the valve chambers 41 to 45 has a cylindrical depression-like depression formed on the front and rear end faces of the blocks 21 to 23, or a ring-shaped annular groove that circulates around the depression, It is formed by closing the end faces before and after the series. Hereinafter, the blocks 21 to 23 will be described in order.

  2 is a longitudinal sectional view of the upper block 21, FIG. 3 is a top view showing the front end surface 21a of the upper block 21, and FIG. 4 is a bottom view showing the rear end surface 21b of the upper block 21. As shown in FIG. The upper block 21 includes an inlet 24 as a recess formed in the front end surface 21a, a first valve chamber 41 as a recess formed in the rear end surface 21b, and a recess formed inside the first valve chamber 41. As a third valve chamber 43, and a first orifice channel 31 communicating the inlet 24 and the first valve chamber 41.

  FIG. 5 is a longitudinal sectional view of the lower block 23, FIG. 6 is a top view showing the front end surface 23 a of the lower block 23, and FIG. 7 is a bottom view showing the rear end surface 23 b of the lower block 23. The lower block 23 includes a second valve chamber 42 as a concave groove formed in the front end surface 23a, a fourth valve chamber 44 as a concave portion formed inside the second valve chamber 42, and the fourth valve chamber. And a fifth orifice channel 35 that opens to the rear end face 23b as an outlet.

  8 is a longitudinal sectional view of the middle block 22, and FIG. 9 is a top view (bottom view) showing the front end face 22a (rear end face 22b) of the middle block 22. As shown in FIG. The middle block 22 includes a second orifice channel 32 that communicates the first valve chamber 41 and the second valve chamber 42, and a third orifice that communicates the second valve chamber 42 and the third valve chamber 43. A flow path 33 and a fourth orifice flow path 34 that communicates the third valve chamber 43 and the fourth valve chamber 44 are provided.

Next, the operation of the present embodiment will be described.
In FIG. 1, an upper block 21, an intermediate block 22, and a lower block 23 that constitute the orifice body 20 are arranged in the flow path 12 of the trap casing 11 in a series direction with front and rear end surfaces in close contact with each other.

  In this state, when a steam fluid from a steam-using device or a steam transport pipe (not shown) reaches the inlet 24 of the orifice body 20, it flows through the first orifice channel 31 of the upper block 21 and enters the first valve chamber 41. Inflow. At this time, the fluid is diffused in the first valve chamber 41 to reduce the volume and expand the volume, and the kinetic energy is reduced by colliding with the wall (front end surface 22a) facing the outlet of the first orifice channel 31.

  As shown in FIG. 2 and FIG. 4, the first valve chamber 41 is formed in an annular shape that circulates in the circumferential direction, so that the fluid moves half a round in the first valve chamber 41 and the second orifice of the middle block 22. It flows into the flow path 32.

  The fluid that has flowed into the second orifice channel 32 flows into the second valve chamber 42 of the lower block 23 and is diffused, decompressed and volume expanded, and a wall (second valve) facing the outlet of the second orifice channel 32. It collides with the bottom of the chamber 42 and decelerates. As shown in FIG. 6, the second valve chamber 42 is also formed in an annular shape that circulates in the circumferential direction, so that the fluid moves halfway around the second valve chamber 42 and enters the third orifice channel 33 of the intermediate block 22. Inflow.

  As shown in FIG. 9, the middle block 22 is provided with a second orifice channel 32, a third orifice channel 33, and a fourth orifice channel 34. The fluid that has flowed into the third orifice channel 33 returns to the upper block 21 again and flows into the third valve chamber 43. Then, after colliding and expanding again, it flows into the fourth orifice channel 34 of the middle block 22 and flows into the fourth valve chamber 44 of the lower block 23. The fluid colliding with the expansion in the fourth valve chamber 44 flows into the fifth orifice channel 35 provided eccentrically and is discharged from the outlet thereof.

  Thus, by sequentially forming combinations of the orifice channels 31 to 35 and the valve chambers 41 to 44 along the internal channel 20a of the orifice body 20 at a plurality of locations, the fifth orifice channel 35 from the inlet 24 is formed. In the distance to the outlet, the number of combinations of the orifice flow path and the valve chamber is increased to five sets that are provided with only three sets by simply decentering the orifice, and the length of the orifice is also increased by 8/3 times. Therefore, it becomes difficult for fluid to flow.

As a result, in the combination of the orifice flow path and the valve chamber through which the same fluid flows, the cross-sectional area of the orifice can be increased, and clogging due to foreign matters can be prevented.
Further, the collision in each of the valve chambers 41 to 44 causes the kinetic energy to be attenuated, and this is larger as the flow velocity is faster. Therefore, the damping effect is higher when there is more steam than when there is more fluid. Therefore, the effect of preventing the steam from being discharged downstream is enhanced.

  The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention. For example, in the above-described embodiment, the upper, middle and lower blocks are made into one set, but a combination of two or more than four is also possible.

  Here, as the number of combinations of blocks increases, the cross-sectional area of the orifice can be increased even in places where the fluid flow rate is low or where the high differential pressure is high, which is more resistant to foreign matter clogging and increases the effect that steam is not discharged downstream. . Specifically, for example, four blocks 51 to 54 may be combined to form a steam trap 10A shown in FIG. Here, the blocks 52 and 53 forming the middle stage are configured by arranging components having a common structure at different rotation angles, and the cost can be reduced by sharing the blocks in this way.

  The steam trap that automatically discharges steam condensate generated in steam piping systems such as steam transport pipes and steam-using equipment to the outside automatically has a simple structure and requires less labor and time to assemble, thus reducing costs. can do. In addition, it can be configured compactly, and can meet the demand for space saving.

DESCRIPTION OF SYMBOLS 10 ... Steam trap 10A ... Steam trap 11 ... Trap casing 12 ... Flow path 20 ... Orifice main body 20a ... Internal flow path 21 ... Upper block 21a ... Front end surface 21b ... Rear end surface 22 ... Middle block 22a ... Front end surface 22b ... Rear end surface 23 ... Lower block 23a ... Front end face 23b ... Rear end face 24 ... Inlet 31 ... First orifice passage 32 ... Second orifice passage 33 ... Third orifice passage 34 ... Fourth orifice passage 35 ... Fifth orifice passage 41 ... 1st valve chamber 42 ... 2nd valve chamber 43 ... 3rd valve chamber 44 ... 4th valve chamber 51 ... Block 52 ... Block 53 ... Block 54 ... Block

Claims (4)

In a steam trap that includes an orifice body provided in a flow path in which a fluid flows in one direction, and discharges condensed water of steam to the outside by the orifice body,
The orifice body is composed of a plurality of blocks arranged in series in a state where front and rear end surfaces are in close contact with each other,
The plurality of blocks include an internal flow path that communicates with each other between the blocks, circulates the fluid, guides the fluid from the inlet side to the one direction and vice versa, and then toward the outlet side
A steam trap, wherein a combination of an orifice channel having a small-diameter cross section and a valve chamber extending to the outlet side is sequentially formed at a plurality of locations along the internal channel.   2. The steam trap according to claim 1, wherein each of the orifice channels in the internal channel has a center axis that is eccentric before and after series.   The valve chamber in the internal flow path is formed by closing concave recesses formed on the front and rear end faces of the block or annular grooves formed around the recess with the front and rear end faces in series. The steam trap according to claim 1, wherein the steam trap is performed. The plurality of blocks include three blocks, an upper block, a middle block, and a lower block,
The upper block includes an inlet as the concave portion formed in the front end surface, a first valve chamber as the concave groove formed in the rear end surface, and the concave portion formed inside the first valve chamber. A third valve chamber, and a first orifice channel that communicates the inlet and the first valve chamber,
The lower block communicates with the second valve chamber as the concave groove formed in the front end surface, the fourth valve chamber as the concave portion formed inside the second valve chamber, and the fourth valve chamber. And a fifth orifice channel having an outlet opening at the rear end surface,
The middle block includes a second orifice channel that communicates the first valve chamber and the second valve chamber, a third orifice channel that communicates the second valve chamber and the third valve chamber, The steam trap according to claim 3, further comprising a fourth orifice channel that communicates the third valve chamber and the fourth valve chamber.

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