JP6523545B1 - Fluid discharge device - Google Patents

Abstract

A fluid discharge device having an orifice, which is, for example, an orifice type steam trap, preferably eliminating clogging when the orifice is clogged. A fluid discharge device (10) according to an embodiment of the present invention includes an orifice (12), and is a flow path restricting portion (20) provided upstream of the orifice in a flow path (14) of the fluid discharge device. The hole 22 of the flow passage restricting portion is a flow passage restricting portion having an opening cross-sectional area larger than that of the orifice 12 and a bypass portion 24 communicated between the flow passage restricting portion and the orifice, A valve 30 is provided in the bypass flow passage 26 of the bypass portion, and the bypass flow passage includes a bypass portion whose cross-sectional area is larger than the opening cross-sectional area of the hole of the flow passage restriction portion. [Selected figure] Figure 1

Description

  The present invention relates to a fluid discharge device for discharging fluid from piping or the like.

  BACKGROUND Conventionally, in steam piping systems such as steam transport pipes and devices using steam, a steam trap that automatically discharges condensed water of the steam to the outside is used. The steam trap is an orifice type steam trap provided with a normally open orifice for discharging the above-mentioned condensed water.

  In the orifice type steam trap, when the orifice diameter is small, there is a problem that foreign substances such as deposits are easily clogged in the orifice. Therefore, in such a steam trap, various means or methods for suppressing clogging of the orifice have been proposed (see, for example, Patent Document 1 and Patent Document 2).

JP, 2010-281372, A JP, 2015-45377, A

  However, neither the steam trap described in Patent Document 1 nor the steam trap described in Patent Document 2 is directed to preventing clogging of the orifice, and is not directed to clearing the clogging when the orifice is clogged.

  Therefore, the present invention has been made in view of the above problems, and an object thereof is, for example, in a fluid discharge device having an orifice which is an orifice type steam trap, the clogging is preferably eliminated when the orifice is clogged. It is to do.

In order to achieve the above object, one aspect of the present invention is
A fluid discharge device having an orifice, wherein
A flow path restriction portion provided upstream of the orifice in the flow path of the fluid discharge device, wherein the hole of the flow path restriction portion has an opening cross-sectional area larger than that of the orifice. When,
A bypass portion communicating between the flow path limiting portion and the orifice, wherein a valve is provided in the bypass flow path of the bypass portion, and a cross-sectional area of the bypass flow path is the flow path limiting portion A fluid discharge device is provided, including a bypass portion that is larger than the opening cross-sectional area of the hole.

  Preferably, the hole of the flow passage restriction portion is formed such that fluid passing through the hole of the flow passage restriction portion is directed directly to the orifice.

  The fluid ejector may be a steam trap.

  According to the fluid discharge device according to the above aspect of the present invention, when the orifice is clogged, the clog can be suitably eliminated.

It is a schematic block diagram of the fluid discharge device concerning one embodiment of the present invention. It is a figure for demonstrating the manufacture example of the fluid discharge device of FIG. FIG. 7 is a schematic view showing the operating state of the fluid ejection device of FIG. 1 when the orifice is not clogged. FIG. 7 is a schematic view showing the operating state of the fluid discharge device of FIG. 1 when the orifice is clogged. It is a schematic diagram showing the action | operation state of the fluid discharge device of FIG. 1 when a valve is opened, when an orifice is clogged. It is a schematic diagram showing the action | operation state of the fluid discharge device of FIG. 1 when clogging of the orifice was eliminated.

  Hereinafter, an embodiment according to the present invention will be described based on the attached drawings. The same parts (or configurations) are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description about them will not be repeated.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a steam trap 10 as a fluid discharge device according to an embodiment of the present invention. In addition, "steam trap" is a trap used for steam equipment and steam piping etc. "Trap" is a generic name of self-powered valve which automatically drains from equipment, piping etc. in JIS B 0100. It is defined as ".

  The steam trap 10 is provided with an orifice 12. The orifice 12 is a hole provided in the fluid flow path 14 defined along the central axis 10A of the steam trap 10, and the reduced diameter portion narrower than the portions 14b and 14c of the flow path 14 before and after that. It is.

  The steam trap 10 includes a main body 16 in which a flow path 14 is formed. The axis 16A of the main body 16 coincides with the central axis 10A of the steam trap 10. The main body portion 16 is a substantially cylindrical member, and partitions the flow path 14 penetrating from the first end face 16b to the second end face 16c along the axis 16A. The first end face 16b is located on the opposite side of the second end face 16c, and extends orthogonal to the axis 16A as well as the second end face 16c. In the steam trap 10, the first end face 16b side is connected to a steam piping system such as a steam transport pipe or a device using steam. Preferably, the steam trap 10 is applied such that the first end face 16 b is located vertically above the second end face 16 c. In FIG. 1, the axis 10A of the steam trap 10 extends in the vertical direction, and the steam trap 10 is depicted in this posture in the other drawings. However, the present invention is not limited to the use of the steam trap 10 in that position.

  An orifice plate portion 18 is provided in the middle of the flow path 14, that is, between the first end face 16 b and the second end face 16 c. The orifice plate 18 extends perpendicularly to the central axis 10 A and extends inside the main body 16. The orifice plate 18 is formed with a hole or orifice 12 extending therethrough. The orifice 12 is formed to have the central axis 10A as its axis. Although the orifice 12 is a cylindrical hole in FIG. 1, it is more preferable that the orifice 12 be tapered so as to extend from the first end face 16 b side to the second end face 16 c side, for example.

  A flow path restricting portion 20 is provided on the first end face 16 b side of the orifice plate portion 18, that is, on the upstream side of the flow path 14. The flow path limiting portion 20 is a plate-like portion extending orthogonal to the central axis 10A between the first end face 16b and the second end face 16c, and extends inside the main body portion 16. The flow path restricting portion 20 is formed to have a hole or a through hole 22 penetrating therethrough. The through hole 22 may be referred to as a second orifice, and in this case, the orifice 12 may be referred to as a first orifice. The through hole 22 is formed to have the central axis 10A as its axis. In FIG. 1, the through hole 22 is a cylindrical hole, but may be tapered, for example, so as to expand from the first end face 16 b side to the second end face 16 c side.

  As is apparent from FIG. 1, the flow channel 14 has the same diameter D1, that is, the cross-sectional area, except for the orifice plate portion 18 having the orifice 12 and the flow path limiting portion 20 having the through hole 22. Therefore, the fluid flowing from the upstream side into the flow passage 14 reaches the through hole 22 from the first flow passage 14a of diameter D1 and is narrowed by the through hole 22 and then passes through the second flow passage 14b of diameter D1 and the orifice 12 And may be squeezed by the orifice 12 and discharged to the external environment, for example, through the third flow passage 14c of diameter D1.

  Furthermore, a bypass portion 24 extending from the main body portion 16 to the outside is provided. The bypass portion 24 forms a bypass flow passage 26 extending from the inside to the outside of the main body portion 16. The bypass portion 24, that is, the bypass flow passage 26 communicates with the second flow passage 14 b between the orifice 12 and the flow passage restriction portion 20. The bypass passage 26 has a bypass axis 26A defined to extend in the radial direction from the central axis 10A of the steam trap 10 as a central axis. However, the bypass flow channel 26 is not limited to extending in the radial direction as described above, and for example, the bypass flow channel 26 is provided to extend in the tangential direction of the second flow channel 14b in a virtual cross section determined to be orthogonal to the central axis 10A. It may be done.

  The bypass flow path 26 is provided with a valve 30. The valve 30 is a manual valve here but may be a motorized valve. Further, the type of the valve 30 may be a butterfly type, a shutter type, or a poppet type, and the present invention does not matter whether the type of the valve 30 is used.

The opening diameter (diameter) D2 of the orifice 12 has the relationship of the following expression (1) with the opening diameter (diameter) D3 of the through hole 22 and the flow passage diameter (diameter) D4 of the bypass flow passage 26. In addition, in (1) Formula, the relationship between them and the diameter D1 of the flow path 14 is also shown. Because of the relationship of equation (1), the through hole 22 of the flow path limiting unit 20 has an opening cross-sectional area larger than that of the orifice 12. Further, the cross-sectional area of the bypass flow passage 26 is larger than the opening cross-sectional area of the through hole 22 of the flow passage restriction portion 20.
D2 <D3 <D4 <D1 (1)

  The opening diameter D2 of the orifice 12, the opening diameter D3 of the through hole 22 of the flow path limiting portion 20, the flow path diameter D4 of the bypass flow path 26, and the diameter D1 of the flow path 14 are pipes to which the steam trap 10 is applied. It may be determined according to the fluid flowing. The fluid flowing in the piping to which the steam trap 10 of the present embodiment is applied is steam. Therefore, in the steam trap 10, in particular, the opening diameter D2 of the orifice 12 is determined so that only the condensed water of the steam is discharged from the orifice 12 and the steam is not leaked.

  The opening diameter D2 of the orifice 12 may be, for example, 1.5 mm or less, preferably 1 mm or less. Further, the opening diameter D2 of the orifice 12 is 0.3 mm or more. For example, the diameter D2 of the orifice 12 may be about 0.7 mm. The opening diameter D2 may have dimensions other than these.

  The opening diameter D3 of the through hole 22 of the flow path restricting portion 22 is usually determined so that the through hole 22 does not get clogged by foreign matter and the like and both the vapor and the condensed water also pass through. Furthermore, as described later, the opening diameter D3 of the through hole 22 should not be too large so that the fluid spouted from the through hole 22 can remove foreign matter and the like when the orifice 12 is clogged. The opening diameter D3 of the through hole 22 may be, for example, 3 mm or more and 5 mm or less.

  The steam trap 10 shown in FIG. 1 is configured such that the main body portion 16 integrally includes the orifice plate portion 18 and the flow path restricting portion 20. However, the steam trap 10 can be configured by assembling a plurality of members. For example, as shown in FIG. 2, the steam trap 10 includes an outer cylindrical portion 40 including a bypass portion 24, a first inner insertion portion 42 including a flow rate limiting portion 20, an orifice plate portion 18, and a cylindrical first portion. The two inner insertion portions 44 may be assembled. The flow rate limiting unit 20 may be a member independent of the first inner insertion portion 42. And when manufacturing steam trap 10 by assembling a plurality of members, a seal member may be provided between each member. In addition, when connecting each member mutually, mechanical connection means, such as a screw mechanism, may be used, and chemical connection means, such as welding, may be used.

  The operation and effects of the steam trap 10 having the above configuration will be described based on FIGS. 3 to 6. FIG. 3 shows the steam trap 10 in which the first end face 16b side is connected to a steam piping system such as a steam transport pipe or a device using steam, where steam, particularly condensed water W thereof flows from the first end face side. It is a schematic diagram shown. In the steam trap 10 of FIG. 3, the condensed water passes through the first flow passage 14 a, the through hole 22, and the second flow passage 14 b in order, and then is discharged to the outside by passing through the orifice 12. In the steam trap 10 of FIG. 3, the valve 30 is completely closed.

  When the steam trap 10 is new or similar or after cleaning, only condensed water is automatically discharged to the outside from the orifice 12 of the steam trap 10 as shown in FIG. However, for example, when time passes more than a certain amount, it is a salt or an oxide of metal ions contained in condensed water, for example, a Ca-based compound or rust that has flowed from the upstream of the steam trap 10. Etc. adheres to the orifice 12 or its periphery. If foreign matter or the like accumulates on the orifice 12, the fluid discharge efficiency of the steam trap 10 decreases, and if it is left as it is, the orifice 12 is blocked by the foreign matter or the like and the condensed water can not be discharged. The steam trap 10 in a state in which the orifice 12 is clogged by foreign matter C is shown in FIG.

  In order to clear the clogging of the orifice 12 in the steam trap 10 of FIG. 4, the operator can remove the steam trap and clean or clean it like the conventional steam trap. However, since the steam trap 10 has the above configuration, clogging of the orifice 12 can be eliminated without removing the steam trap.

  In the steam trap 10 of FIG. 4, if clogging occurs in the orifice 12, condensed water is accumulated in a steam pipe or the like, so that the working efficiency of a device using steam or the like is reduced. For example, when there is a heat exchanger on the upstream side of the steam trap 10 with the steam generated by the boiler, the efficiency of heat exchange in the heat exchanger is reduced. Therefore, such operation efficiency or its equivalent value is detected, for example, based on the output of the temperature sensor provided in the above-mentioned heat exchanger, and when the operation efficiency falls below a predetermined level, the orifice 12 is clogged Can be determined.

  When the orifice 12 is clogged, for example, when it is determined that the orifice 12 is clogged, the worker opens the valve 30. Thereby, as shown in FIG. 5, the condensed water etc. which accumulated in the 2nd flow path 14b are discharged | emitted via the valve | bulb 30 outside. At this time, since the opening diameter D3 of the through hole 22 is smaller than the flow passage diameter D4 of the bypass flow passage 26, the flow rate of condensed water or the like guided to the second flow passage 14b via the through hole 22 It is less than the flow rate of condensed water etc. discharged to the outside via Therefore, as shown in FIG. 5, the condensed water is hardly accumulated in the second flow path 14b, and the condensed water or the like flowing out of the through hole 22 vigorously falls on the orifice 12 and the periphery thereof. In particular, the through hole 22 is disposed on the central axis 10 of the steam trap 10 in the same manner as the orifice 12, in other words, the fluid passing through the through hole 22 is positioned and directly directed to the orifice 12 It is done. The through holes 22 are defined so as to pass steam and condensed water but not too large. Therefore, condensed water or the like can flow out of the through hole 22 and more preferably collide with the orifice 12 or its periphery. The steam trap 10 in this state is shown in FIG.

  The condensed water or the like vigorously collides with the orifice 12 or the periphery thereof, so that foreign matter C or the like clogged in the orifice 12 can be removed. The separated foreign matter C and the like may be discharged together with the condensed water and the like through the valve 30. FIG. 6 schematically illustrates the discharge of foreign matter and the like through the bypass flow channel 26. Thus, foreign matter C and the like can be removed, and clogging of the orifice 12 can be suitably eliminated. Therefore, as shown in FIG. 6, the condensed water can flow out from the orifice 12. When the valve 30 is closed in the state of FIG. 6, as described based on FIG. 1, it is possible to discharge only the condensed water again.

  As mentioned above, although the steam trap 10 as a fluid discharge device concerning one embodiment of the present invention was explained, the present invention is not limited to the above-mentioned composition. The fluid discharge device according to the present invention may be other than a steam trap, and may be, for example, a discharge device of oil or the like (fuel oil, edible oil or the like).

  As mentioned above, although typical embodiment and modification of the present invention were described, the present invention can change variously. Various substitutions and modifications are possible without departing from the spirit and scope of the present invention as defined by the claims of the present application.

DESCRIPTION OF SYMBOLS 10 Steam trap 12 Orifice 18 Orifice plate part 20 Flow restriction part 22 Through hole 24 Bypass part 26 Bypass flow path 30 valve

Claims (2)

A fluid discharge device having an orifice, wherein
A flow path restriction portion provided upstream of the orifice in the flow path of the fluid discharge device, wherein the hole of the flow path restriction portion has an opening cross-sectional area larger than that of the orifice. When,
A bypass portion communicating between the flow path limiting portion and the orifice, wherein a valve is provided in the bypass flow path of the bypass portion, and a cross-sectional area of the bypass flow path is the flow path limiting portion And a bypass portion larger than the opening cross-sectional area of the hole ,
The hole of the flow passage restriction portion is formed such that fluid passing through the hole of the flow passage restriction portion is directed directly to the orifice.
Fluid discharge device. The fluid discharge device is a steam trap, the fluid discharge device according to claim 1.

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