JP5980644B2 - Steam humidifier - Google Patents

Description

  The present invention relates to a steam humidifier that performs spraying so that condensate and water droplets do not enter the air, and particularly relates to the technical field of steam humidifiers used in air conditioners.

Conventionally, an air conditioner is required to maintain the temperature of air appropriately and to maintain appropriate humidity, and a humidifier is provided for this purpose.
The steam humidifier incorporated in these conventional air conditioners has a structure as shown in FIG. 1 and, as disclosed in Patent Document 1 and Patent Document 2 by the present applicant, water vapor from a nozzle provided in the humidification pipe. Is usually sprayed in the form of a mist.
A conventional steam humidifier will be described with reference to FIG. 1. The steam humidifier a is provided with a steam supply part b for supplying high-pressure steam, and the steam is supplied from the steam supply part b to a supply header d via a control valve c. The supply header d is provided with a drain header e facing in the horizontal direction, and a plurality of humidifying pipes g having a large number of nozzles f are provided in parallel between the supply header d and the drain header e. A drain pipe h without a nozzle is provided at the lower stage, and drained water droplets are collected in a drain header e and discharged from a drain discharge pipe i.
Water vapor must be sprayed from the nozzle f of the steam humidifier a. However, if the amount of condensed water returning to the water droplets is not reduced, a large amount of drainage is generated and a treatment device is not provided. However, a further problem is that if water droplets are mixed in this air-conditioned air, it may be scattered in the air conditioner or duct, causing damage to the equipment, so it must be avoided as much as possible.

Japanese Utility Model Publication No. 4-90826 Japanese Patent No. 4716380

By the way, a conventional control valve (electric two-way valve) is provided upstream of the humidified steam supply side to control the amount of steam humidified in the air, but the control valve adjusts the opening according to the required amount of humidification. Adjust the amount of steam flowing. Here, the size of the control valve is determined by the maximum humidification amount. When the required humidification amount is relatively large, the control valve can follow, but when the required humidification amount is small, the controllability follows by the size of the control valve. It becomes difficult.
In general, if the control valve size is large, the lower limit value of the humidification amount adjustment by opening adjustment becomes large, and it becomes difficult to adjust the steam amount by opening degree for the small required humidification amount, and as a result, ON-OFF control is achieved. Needless to say, the controllability is poor with a small amount of humidification. In other words, when adjusting the amount of humidification with a single control valve, if the amount of humidification decreases, operation with a small opening will occur, and if it cannot be fully throttled, ON-OFF control will occur and the humidity will not be stable. There was a point.

In addition, since the supply header of the conventional humidifier is directly arranged in the air conditioner, it is affected by the ambient air in the air conditioner, and the steam in the supply header is likely to become drain, causing drain jumping. There is a problem, that is, if the steam supplied to the humidification tube is low in the case of low temperature air, the steam in the supply header will be cooled by the low temperature air and become condensate, and it will be condensed with the steam from the humidification nozzle. When the condensed water is ejected, there is a problem that it is liable to cause an adverse effect such as wet equipment downstream and water droplets themselves being blown into the air-conditioned space.
The present invention has been made in view of the above-described problems, and the followability of control is further improved even with a small amount of humidification. Further, the steam in the supply header is prevented from becoming drained, and condensed water is added to the air-conditioned space. The purpose is to provide a steam humidifier that prevents the amount of spraying as much as possible.

In order to solve the above-mentioned problems, the invention of claim 1 is a steam humidifier that is supplied with high-pressure steam and humidifies, and is provided with two steam injection systems using a humidifying nozzle that injects steam, and the high-pressure steam is supplied. A control valve is provided in each of the two steam supply sections, and the control valve is connected to a supply header of each system, and a first humidification pipe having a plurality of humidification nozzles from the first supply header of one system Are connected to the first drain header of the first system facing each other, and the drain is discharged from the discharge part at the bottom of the first drain header, and the second supply header of the other system is inside the pipe of the first drain header. Disposing the second humidifying pipe having a plurality of humidifying nozzles from the second supply header to the second drain header of the second system facing each other, and discharging the drain from the discharge part at the bottom of the second drain header, Similarly said No. Supply header is a steam humidifier, characterized in that disposed inside the tube of the second drain header.
The invention according to claim 2 is characterized in that the steam humidifier according to claim 1 operates only one of the two systems of the humidifying nozzle when the humidification amount is small.
According to a third aspect of the present invention, in the steam humidifier of the air conditioner according to the first or second aspect, the humidifying pipes are alternately arranged in the vertical direction.
According to a fourth aspect of the present invention, the steam humidifier according to the first, second, or third aspect is used for conditioned air of an air conditioner.

According to the invention of the steam humidifier of the present invention, since the steam injection system of the humidifying nozzle is made into two systems, a control valve with a supply amount of half of the whole can be used, so a small opening degree with a small amount of humidification can be used. Even during operation, ON-OFF control is not performed, and control follow-up is further improved. Also, if the two steam injection systems are operated together, it is possible to operate with a larger opening than when there is only one control valve, and the ON / OFF control is not performed and the humidity is stabilized.
Further, since the steam injection system of the humidifying nozzles is arranged with two humidifying nozzles alternately in the vertical direction, the distribution of steam is improved.
Furthermore, because the supply headers of each other are placed in the other drain header filled with relatively warm steam, the supply headers are isolated from the influence of the ambient air by the drain header even when the ambient temperature is low. It is difficult for the steam to become drainage, and it is possible to prevent drainage. Moreover, since the steam injection system of the humidifying nozzle is made into two systems, it is not an expensive large-sized humidifier rather than dividing it into two humidifiers with half the capacity, so that it is low cost and space-saving. Furthermore, even if one system fails, it is possible to operate the other system and take emergency measures.

  Further, in the case of the humidification amount of the small amount of steam injection described above, only one of the first system and the second system of the steam injection system of the humidifying nozzle will be operated, and the inside of the drain header of the system that does not operate Is not warm because no steam is supplied, but the outside of the supply header is still surrounded by a drain header, which isolates the supply header from the effects of ambient air, so that the supply header (41, 42) It is difficult for the steam to become drain, and it is possible to prevent drain jumping.

A schematic diagram showing an overview of a conventional steam humidifying tube, It is a schematic diagram which shows the outline | summary of the steam humidifier of this invention.

An embodiment of a steam humidifier provided in the air conditioner of the present invention will be described with reference to FIG.
In FIG. 2, in this embodiment, the steam humidifier 1 provided in the air conditioner is provided with two steam injection systems that are supplied with high-pressure steam and humidify.
From the first system of these steam injections (hereinafter, the members of the first system will be referred to as “first”), the two-way valve from the first steam supply unit 21 opens and closes in stages according to the required steam volume. High-pressure steam is supplied by the first control valve 31 that performs control, and the controlled predetermined amount of high-pressure steam is supplied to the first supply header 41, and the first supply header 41 is supplied to the opposing first drain header 51. A plurality of first humidification tubes 61 are spanned and connected.

  The first supply header 41 has a bottom 43 and is provided with a drain pipe 71 without a nozzle at the lowest stage of the first humidification pipe 61, so that drain water collected at the bottom 411 of the first supply header 41. Is guided to the first drain header 51. This drains drain water accumulated in the steam pipe 8 or the like from the first drain header 51 through the drain pipe 71 at the start-up in the morning.

A humidifying nozzle 611 is provided at a predetermined location on the outer periphery of the first humidifying tube 61, and the distribution of the humidifying nozzle 611 is arranged so that the distribution of the sprayed water vapor is appropriate.
The atmosphere which is sprayed as water vapor from the humidifying nozzle 611 and mixed with the remaining water vapor and condensed water is discharged as drain from the discharge portion 511 at the bottom of the first drain header 51.
The first drain header 51 is a large-diameter tube type and is filled with relatively warm steam. By utilizing this relatively warm atmosphere, the second system (hereinafter, the members of the second system are referred to as “first system”). 2) is provided in the pipe of the first drain header 51. With such a configuration, since the surroundings of the second supply header 42 are in a relatively warm atmosphere, the cold air in the air passage is not exposed, so that the second supply header 42 is prevented from being cooled. Thereby, the vapor | steam in the 2nd supply header 42 cannot become a drain easily, and a drain jump can also be reduced.

  Here, the shape of the first drain header 51 and the second drain header 52 is a large-diameter pipe type, but since the inside of the first drain header 51 and the second drain header 52 needs to have a two-tube structure in which the supply header is arranged, the inside is also of a large diameter. It must be an empty tube, and the cross-sectional shape of the “tube type” may be a circle, an ellipse, a polygon such as a quadrangular prism, a semicircular shape, a kamaboko type, etc. .

  Similarly, since the first supply header 41 of the first system of steam injection is also arranged in the pipe of the second drain header 52 of the second system with a relatively warm atmosphere, the first supply header 41 is cooled. Therefore, it is difficult for the steam in the first supply header 41 to become drain, and the drain jump can also be reduced.

Next, the second system of the steam injection will be described again, but it is almost the same as the first system, and the open / close control is performed stepwise according to the required amount of steam by the electric two-way valve from the second steam supply unit 22. High-pressure steam is supplied by the second control valve 32, and a predetermined amount of high-pressure steam controlled is supplied to the second supply header 42, and the second supply header 42 has a plurality of second drain headers 52 facing each other. Two humidification pipes 62 are spanned and connected. The second supply header 42 has a bottom having a bottom 421, and a drain pipe 72 having no nozzle is provided at the lowermost stage of the second humidification pipe 62. The bottom of the second supply header 42 is the same as in the first system. The drain water accumulated in 421 is guided to the second drain header 52 and drained from the drain pipe 72.
A humidifying nozzle 621 is provided at a predetermined location on the outer periphery of the second humidifying tube 62, and the distribution of the sprayed water vapor is appropriate for the distribution of the humidifying nozzle 621 and the humidifying nozzle 611 of the first system. Has been placed.
The atmosphere which is sprayed as water vapor from the humidifying nozzle 621 and the remaining water vapor and condensed water coexist is discharged as drain from the discharge portion 521 at the bottom of the second drain header 52.

Here, since the 1st humidification pipe | tube 61 and the 2nd humidification pipe | tube 62 which branched from a pair of supply header (41,42) were arranged alternately by the orthogonal | vertical direction, the ejection of the water vapor | steam from these humidification nozzles (611,621) The speed is inevitably faster when close to the supply header (41, 42) and slower at the end, but this tendency is changed by alternately arranging in the vertical direction, so that the injection state is made uniform.
Further, in combination with the humidifying nozzles 611 and 621 appropriately set in the humidifying pipes (611 and 621), the spray distribution becomes more uniform. In addition, although the humidification pipe | tube (611, 621) is only displayed up and down in FIG. 2, of course, the humidification pipe | tube (611, 621) is arrange | positioned suitably also in the intermediate part.

[Operation]
In this embodiment, the steam injection system of the humidifying nozzle is made into two systems, and two humidifiers having the same capacity are prepared. When a small amount of water vapor is injected, either the first system or the second system is used. Select and operate.
That is, the size of the control valve is determined by the maximum humidification amount, but in the case of this embodiment, each control valve can also halve the capacity of the entire humidification amount, and the required humidification amount is halved. Accordingly, the control valve size can be reduced, thereby improving the followability of control in the small injection region.
In general, if the control valve size is small, the lower limit value of the humidification amount adjustment by adjusting the opening becomes smaller. ON / OFF control in a region can be avoided, and a small amount of humidification improves control followability and stabilizes the humidity of conditioned air.

In this case, either the first system or the second system of the steam injection system of the humidifying nozzle is operated, but steam is supplied to the inside of the drain header (51, 52) of the system that does not operate. Because it is not warmed, the outside of the supply header (41, 42) is still surrounded by the drain header (51, 52), and the supply header (41, 42) is isolated from the influence of ambient air. The steam in the supply headers (41, 42) is unlikely to become drainage, and drainage can be prevented.
As described above, when the humidification amount of the steam injection is small, either the first system or the second system is selected and operated from the followability of the control valve. However, if the humidification amount increases, the humidification nozzle If two steam injection systems are operated, the inside of the pipe of the drain header (51, 52) is warmed and the steam is less likely to become drainage. Therefore, it is preferable to operate the two systems simultaneously.

According to the invention of the steam humidifier of the present invention, in addition to the operation and effect described above, the steam injection system of the humidifying nozzle is divided into two systems. Since it is not a humidifier, it saves space at low cost. Furthermore, even if one system fails, it is possible to operate the other system and take emergency measures.
Needless to say, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.

1 .. Steam humidifier 21 .. 1st steam supply part, 22 .. 2nd steam supply part,
31..First control valve, 32..Second control valve,
41 ··· First supply header, 42 ··· Second supply header, 411, 421 ·· Bottom,
51 .. First drain header, 52 .. Second drain header,
511,521 .. discharge section,
61 .. First humidifying tube, 62 .. Second humidifying tube,
611, 621 ... Humidification nozzle 71, 72 ... Drain pipe,
8. Steam piping

Claims (4)

In a steam humidifier that is supplied with high-pressure steam and humidifies it,
Two steam injection systems with a humidifying nozzle that injects water vapor are provided,
Each of the two steam supply sections to which the high-pressure steam is supplied is provided with a control valve,
The control valve is connected to the supply header of each system,
A first humidification pipe having a plurality of humidification nozzles is connected to the first drain header of the first system facing from the first supply header of one system, and the drain is discharged from the discharge part at the bottom of the first drain header. ,
The second supply header of the other system is arranged inside the pipe of the first drain header, and the second humidification pipe having a plurality of humidification nozzles is connected to the second drain header of the second system facing from the second supply header. Connect to drain from the drain at the bottom of the second drain header,
Similarly, the steam humidifier is characterized in that the first supply header is disposed inside the pipe of the second drain header.   The steam humidifier according to claim 1, wherein when the amount of humidification is small, only one of the two systems is operated as the humidifying nozzle. vessel.   The steam humidifier of the air conditioner according to claim 1 or 2, wherein the humidifying pipes are alternately arranged in the vertical direction.   The steam humidifier according to claim 1, 2 or 3, wherein the steam humidifier is used for conditioned air of an air conditioner.

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