JP2019196807A - Nozzle type steam trap - Google Patents

Abstract

To obtain a nozzle type steam trap capable of adjusting the flow rate of drain easily in short time by external adjustment, and having a simple structure.SOLUTION: A nozzle type steam trap having a nozzle 5 in a path from a drain inlet 11 to a drain outlet 12, has a needle 20 that moves forward and backward from one end side of the nozzle 5 with respect to a drain discharge hole 51 of the nozzle 5. The needle 20 constitutes a needle valve that moves forward and backward by an external operation, to adjust the flow rate of drain together with the nozzle 5.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a nozzle-type steam trap that separates and discharges condensed water (hereinafter referred to as “drain”) generated by heat exchange of steam.

  In factories and other facilities that use steam as a heating source, steam traps that discharge heat generated in the heat exchanger and steam transport path outside the system are used to ensure operational stability and safety. ing.

  Various types of movable traps are widely known. Nozzle-type steam traps are widely used that utilize the fact that the kinematic viscosity when passing through a fine passage is lower in water than in steam and the mass flow rate of water is higher than in steam. The nozzle-type steam trap is a mechanism in which a nozzle is mounted in the main body, the passage of steam is blocked by a drain discharge hole provided in the nozzle, and only the drain is allowed to pass.

  The steam trap needs to adjust the flow rate of the drain according to the amount of drain discharge. In the conventional nozzle type steam trap, several types of nozzles having different drain discharge hole diameters are prepared, and a nozzle having a suitable drain discharge hole diameter is selected and mounted.

  According to such a conventional nozzle-type steam trap, in order to adjust the flow rate of the drain, it is necessary to remove a member such as a lid that seals the internal space, replace the nozzle, and seal again. . Therefore, in order to adjust the drain to an appropriate flow rate, it is necessary to determine whether or not the nozzle is appropriate while observing the discharge amount of the drain, and to adjust it by repeatedly attaching and detaching the nozzle. It took effort.

  Patent Document 1 describes a nozzle-type steam trap in which the height difference between the drain discharge port and the drain system discharge port that discharges the drain from the drain reservoir to the outside of the steam strap system is variable by a rotation mechanism. .

Japanese Patent No. 5694619

  A large vapor pressure is applied to the inlet side of the nozzle of the nozzle type steam trap, and the pressure on the outlet side of the nozzle is smaller than the pressure on the inlet side. In many cases, the drain discharged from the steam trap is returned to the boiler side through the pipe and reused, and since the pipe is standing up, the drain discharge side is in a drain pool state. Therefore, as described in Patent Document 1, even if the height difference between the drain outlet and the drain outlet outside the drain system is variable by the rotation mechanism, the drain flow rate is hardly changed, and the flow rate adjusting effect cannot be expected. .

  An object of the present invention is to provide a nozzle-type steam trap that can easily adjust the flow rate of a drain in a short time by adjusting from the outside while the internal space is closed, and has a simple configuration. .

The present invention
A nozzle-type steam trap having a nozzle in a path from a drain inlet to a drain outlet;
A needle that advances and retreats from one end side of the nozzle with respect to the drain discharge hole of the nozzle;
The most important feature of the needle is that it constitutes a needle valve that moves forward and backward by an external operation and adjusts the flow rate of the drain together with the nozzle.

  By adjusting the needle valve without opening the internal space and replacing the nozzle, the drain discharge amount can be finely adjusted easily and in a short time. The configuration for finely adjusting the flow rate of the drain is a configuration in which the needle valve is advanced and retracted with respect to the nozzle essential for the nozzle-type steam trap, and thus the configuration is simple.

It is the side view which looked at the example of the nozzle type steam trap concerning the present invention from the exit side of the drain. It is sectional drawing which follows the line AA shown in FIG. 1 of the said Example.

  Embodiments of a nozzle-type steam trap according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the nozzle-type steam trap is mainly configured by a housing 1 that is an integrally molded product by a die-cast method using a metal as a raw material. The housing 1 is substantially cylindrical and has a drain inlet 11 and a drain outlet 12.

  The drain inlet 11 and outlet 12 are aligned on a common central axis. In the embodiment of the housing 1 shown in FIG. 2, the central axis is in the horizontal direction. The steam trap is installed, for example, at a drain outlet of a heat exchanger that uses steam, and a drain inlet 11 is connected to the drain outlet. The drain outlet 12 can be connected to a steam generator, for example. By doing so, the drain, that is, the water produced by the condensation of the steam can be returned to the steam generator, and can be converted into steam again.

  On the drain inlet 11 side, there is a type in which a strainer incorporating a filter is incorporated as a common housing in order to remove solid matter from the drain. However, in the present embodiment, a strainer configured as a separate body can be mounted. A female thread is formed on the inner periphery of the drain 1 of the housing 1 on the inlet 11 side, and this female thread is a strainer mounting portion.

  In the housing 1, a nozzle mounting portion 15 is formed between the inlet 11 and the outlet 12 of the drain. The nozzle mounting portion 15 is formed in a cylindrical shape in the radial direction of the housing 1, that is, in a direction orthogonal to the central axis of the housing 1, and a surface corresponding to the cylindrical inner peripheral surface is formed with a female screw. The nozzle 5 is mounted on the nozzle mounting portion 15 by being screwed into the female screw. The nozzle 5 has a drain discharge hole 51 that passes through the nozzle 5 along the central axis. Accordingly, the drain discharge hole 51 of the nozzle 5 is oriented in the vertical direction in FIG.

  The drain is connected to the inlet 11, the communication hole 13 that connects the inlet 11 and the lower end of the drain discharge hole 51 of the nozzle 5 in FIG. 2, the drain discharge hole 51 of the nozzle 5, and the communication that connects the upper end of the drain discharge hole 51 and the outlet 12. It flows in the order of the hole 14 and the outlet 12. In FIG. 2, the nozzle 5 is mounted in the vertical direction, and the drain flows through the drain discharge hole 51 from the bottom to the top.

  In the housing 1, a needle holding portion 16 is formed at a position facing one end side of the needle 5. The needle holding portion 16 bulges in a cylindrical shape from the outer peripheral surface to the outer side in the radial direction at the central portion in the longitudinal direction of the cylindrical housing 1 as a whole. A female screw is formed on the inner peripheral surface of the needle holding portion 16, and a screw portion 22 of the needle 20 is screwed into the female screw. The needle 20 is rotated about its central axis, whereby the screw portion 22 is guided by the female screw and is held by the needle holding portion 16 so as to be able to advance and retreat.

  The tip 20 of the needle 20 corresponding to the lower end in FIG. 2 has an acute conical shape, and the tip 21 can be advanced and retracted with respect to the drain discharge hole 51 at the upper end of the nozzle 5. Since the tip end portion 21 of the needle 20 has a conical shape, when the needle 20 advances and retreats, a ring shape is generated between the drain discharge end side peripheral wall of the drain discharge hole 51 of the nozzle 5 and the tip end portion 21 of the needle 20. The gap area increases or decreases. The flow rate of the drain flowing from the inlet 11 to the outlet 12 can be adjusted by increasing or decreasing the gap area. That is, the needle 20 and the nozzle 5 constitute a needle valve.

  The needle 20 has an operation portion 23 at the upper end in FIG. 2, and the needle 20 can be advanced and retracted as described above by rotating the operation portion 23. The needle 20 passes through the cap 32, and the cap 32 is screwed into a male screw formed on the outer periphery of the needle holding portion 16. An appropriate sealing material is interposed between the needle 20 and the needle holding part 16 and between the cap 32 and the needle 20 and the needle holding part 16, and the inside of the housing 1 is sealed.

  The housing 1 has a nozzle replacement hole 18 on the side opposite to the needle holding portion 16 with the nozzle 20 interposed therebetween. A female screw is formed on the peripheral wall of the nozzle replacement hole 18, and a lid 30 is screwed into the female screw. The nozzle replacement hole 18 is sealed with a lid 30 and an appropriate sealing material.

  In the embodiment of the nozzle type steam trap described above, the inlet 11 is connected to, for example, the drain outlet of the heat exchanger. The nozzle-type steam trap is filled with the drain from the inlet 11 in the order of the communication hole 13, the drain discharge hole 51 of the nozzle 5, the communication path 14, and the outlet 12, and the drain flows in the order described above. By providing the nozzle 5, most of the vapor is separated from the drain and only the drain is discharged from the outlet 12.

  FIG. 1 and FIG. 2 show a nozzle type steam trap in a state in which the needle holding portion 16 is on the top and the nozzle replacement hole 18 is on the bottom. However, in this embodiment, since the housing 1 has a structure in which the strainer is a separate body, the posture of the nozzle-type steam trap can be arbitrarily rotated without being limited by the posture of the strainer. If the posture of the nozzle type steam trap is limited to the posture shown in FIGS. 1 and 2, the lid 30 becomes the lower surface side of the housing 1, and the replacement of the nozzle 5 becomes troublesome.

  In that respect, according to the illustrated embodiment, the housing 1 can be rotated around its central axis so that the lid 30 is on the upper side, and the nozzle 5 can be easily replaced. In the above installation mode, the operation portion 23 of the needle 20 is positioned on the lower side of the housing 1. However, since the operation portion 23 only rotates, there is no hindrance to the operation. Even if the rotation position of the housing 1 is in the horizontal or oblique direction and the operation part 23 of the needle 20 is located in the horizontal or oblique direction, the replacement of the nozzle 5 and the operability of the operation part 23 are good.

  It is necessary to set the flow rate of the drain discharged through the steam trap according to the specifications of the heat exchanger to which the nozzle type steam trap is connected. According to the said Example, the nozzle 5 is mounted | worn according to the specification of a heat exchanger. The nozzle 5 can be easily mounted by removing the lid 30 and opening the position of the housing 1 facing the nozzle 5, and can be easily replaced with a nozzle 5 having a different specification.

  Selection of the specification of the nozzle 5 can be said to be rough adjustment of the flow rate of the drain. Fine adjustment of the flow rate of the drain can be performed by a needle valve including the nozzle 5 and the needle 20. A nozzle 5 having a larger discharge hole is selected, and fine adjustment is performed while the flow rate is reduced by a needle valve.

  According to the above-described embodiment, it is possible to finely adjust the flow rate of the drain to be discharged and to set the flow rate most suitable for the specifications of the heat exchanger, etc., only by operating the needle valve from the outside. The flow rate of the drain is adjusted while observing the flow rate of the drain discharged from the outlet 12 and the presence or absence of vapor leakage. Therefore, an observation window may be provided in the pipe connected to the outlet 12, or a branch pipe for observation may be provided.

  In the conventional nozzle-type steam trap, as described at the beginning, several types of nozzles are prepared depending on the size of the drain discharge port, and adjusted to obtain an appropriate drain flow rate while replacing the nozzles. However, the conventional nozzle-type steam trap does not consider the convenience of nozzle replacement, and requires a lot of labor and time. Further, the drain flow rate was adjusted only by the nozzle, and fine adjustment was not possible.

  On the other hand, according to the nozzle-type steam trap according to the embodiment, if the nozzle 5 having the relatively large drain discharge port 51 is mounted and the flow rate of the drain is finely adjusted by externally operating the needle valve. Good. Therefore, the flow rate of the drain can be easily and quickly performed. Further, the needle valve can finely adjust the flow rate of the drain not continuously but continuously.

  Even if it becomes necessary to replace the nozzle 5 with one having a different specification, the nozzle 5 can be easily replaced by removing the lid 30.

  After adjusting the drain flow rate, the adjustment position of the needle 20 is held. Needle 20 need only be operable when it needs to be adjusted. Therefore, the operation part 23 of the needle 20 is structured so as to be detachable from the needle 20, and the operation member is attached only when necessary.

  The nozzle-type steam trap according to the above embodiment uses a nozzle essential for the nozzle-type steam trap as a part of the needle valve, so that the configuration is simplified despite the fine adjustment of the drain flow rate. can do.

DESCRIPTION OF SYMBOLS 1 Housing 5 Nozzle 11 Drain inlet 12 Drain outlet 15 Nozzle mounting part 16 Needle holding part 18 Nozzle replacement hole 20 Needle

The housing 1 has a nozzle replacement hole 18 on the side opposite to the needle holding portion 16 with the nozzle 5 interposed therebetween. A female screw is formed on the peripheral wall of the nozzle replacement hole 18, and a lid 30 is screwed into the female screw. The nozzle replacement hole 18 is sealed with a lid 30 and an appropriate sealing material.

Claims (6)

A nozzle-type steam trap having a nozzle in a path from a drain inlet to a drain outlet;
A needle that advances and retreats from one end side of the nozzle with respect to the drain discharge hole of the nozzle;
The nozzle is a nozzle-type steam trap that constitutes a needle valve that moves forward and backward by an external operation and adjusts the flow rate of the drain together with the nozzle.   The nozzle type steam trap according to claim 1, wherein the nozzle is mounted on a nozzle mounting portion of a housing formed of an integrally molded product by screwing.   3. The nozzle-type steam trap according to claim 2, wherein the nozzle is mounted in the housing, and the needle is mounted on a needle holding portion of the housing so as to be able to advance and retract toward the drain discharge end side of the nozzle.   4. The nozzle-type steam trap according to claim 2, wherein the housing has a nozzle replacement hole on a side opposite to the needle holding portion across the nozzle, and has a lid that closes the nozzle replacement hole.   The nozzle-type steam trap according to claim 2, 3 or 4, wherein the housing has a strainer mounting portion on the inlet side of the drain.   The nozzle-type steam trap according to claim 5, wherein the housing can take an arbitrary rotation posture with respect to the strainer mounted on the strainer mounting portion.

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