JPS62258941A - Ventilating and air-conditioning equipment - Google Patents

Abstract

PURPOSE:To prevent the adhesion of snow to the surface of a feed filter by a method wherein a perforated board filter, in which a multitude of small holes are bored, is provided between an atmosphere intake and the feed air filter and, further, a reticulated air-permeable net is attached so as to be opposed to the perforated board filter. CONSTITUTION:A perforated board filter 15, in which a multitude of small holes 15a are bored, is provided between an atmosphere intake 1a and a feed air filter 4 and, further, a reticulated air-permeable net 16 is attached so as to be opposed to the downstream side of the filter 15. The air-permeable net 16 is made of a material such as fiber, metal, synthetic resin or the like and the size of the mesh of the net is selected by considering snow arresting performance and the pressure loss of airstream of the air permeable net 16. Highly humid snow pieces, blown into a casing 2a together with atmosphere, are removed by colliding against the perforated board filter 15 and a part of fine powder snow provided with low humidity can be removed by the perforated board filter 15, however, the other part of the powder snow can be arrested by the air-permeable net 16. Accordingly, a ventilating and air-conditioning device seldom suffered from a blockading accident due to snow and high in reliability may be obtained.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Industrial Application Field)
In various plant facilities such as ~, Precision Industry Plan 1~, ventilation air conditioning equipment that controls and maintains cleanliness in indoor lagoons, Ventilation air conditioning V that can prevent accidents in which the air supply filter is blocked by snow that has entered
Set tV1i to 1.

(Prior art) Ventilation and air conditioning systems installed in various plant equipment are used to control indoor temperature and humidity in order to maintain the operation of each machine within the plant at all times, and to maintain appropriate conditions for operators and employees. It is installed for the purpose of maintaining comfortable livability, essay collection rt, or purifying and discharging contaminated air.

Among these, the conventional ventilation air system installed in the atomic bomb 1-JA is constructed as shown in FIGS. 6 to 8.

Outside air is introduced into the supply air processing device 3 through an outside air intake port 1a located on the side of the building 1 of the nuclear power plant equipment. A louver 2 is attached to the outside air intake port 1a, and the inclined surface of the louver 2 prevents rainwater from entering the company building 1. , Said air supply station Fi! Inside the KiU, there are installed an air supply filter 4 that removes dust, particulate salt, and other substances in the outside air, and a heating coil 5 and a cooling coil 6 that heat the outside air. The outside air after being processed by the supply air processing device 3 passes through the supply air duct 7 and passes through the 50% volume 613.
(one of which is a spare) or a 100% capacity fan (one of which is a spare) is used to air the air in areas with high radiation levels (so-called contaminated areas) or spaces where no radioactive materials exist (so-called clean areas). Air is supplied to each air-conditioned space 9 in the area).

In the case of air conditioning for contaminated areas, J
3. Therefore, as shown in FIG. 6, after the air supplied from the air supply duct 7 to the air-conditioned space 9 and the air between the two units are treated in the exhaust treatment IIP 10 located on the right side of the exhaust filter 14. A one-through type is adopted in which the exhaust pipe 11 exits from the exhaust pipe 13 to the outdoors via the exhaust duct 11 through the IJ air sonofunte 12. Said exhaust station 1! The P5AVIJ10J3 and the exhaust fan 12 have a 50% capacity f in order to ensure the safety, reliability, and redundancy of the air supply fan 8 and the 1st shrine-like plant.
il 3' units (one of which is a spare) or 100% capacity lift 2
It consists of two machines (one of which is for pre-boiling).

On the other hand, in JIA cases of air conditioning targeting clean areas, M...
+lL Since accumulation of material costs is not a problem, a portion of the air heat exchanged in the air conditioned space 9 is transferred to the air supply area 11I! A return duct system is adopted in which the remaining air is returned to the Wt3 and the remaining air is vented.

When using any type of ventilation air conditioning system, avoid using filter openings 1' installed at various locations.K G
Must be J. Particularly in nuclear couplants, continuous 24-hour IFI operation is required for about a year, so ventilation and air conditioning systems and III units are required to have sufficient reliability.

(@Illuminating point that the invention seeks to solve) However, the number of cases where plant equipment is constructed in cold regions with a lot of snowfall is increasing, and during the first snowfall of winter, fine snow is carried away by strong winds and the ventilation and air conditioning It may be blown into the equipment and cause problems with operation. In other words, snow enters the supply air processing device 3 along with the outside air introduced from the louver 2 attached to the outside air intake port 1a of the ventilation room a device, and then adheres to the supply air filter 4. □ Gradually increase the accumulation ω and change the air supply filter 4 to 1ffl' in an extremely short period of time. There was a problem in that the function of the entire ventilation air conditioning system was stopped by blocking the air. The present invention was devised to solve the above-mentioned problems, and by incorporating a structure that prevents snow from adhering to the surface of the air supply filter, the influence of snowfall can be minimized. The purpose of the present invention is to provide a highly reliable ventilation air conditioning system. Inside the ventilation air conditioner, we use a perforated plate filter with a large number of small holes in VIF stages between the outside air intake and the supply air filter, and also install a mesh ventilation net opposite the perforated plate filter. It consists of

(Function) Relatively large snowflakes that enter through the outside air intake and are entrained by the outside air collide with the perforated plate filter, coalesce on the surface, and are removed. On the other hand, the moisture is low and the powder snow u1
Some of it adheres to the surface of the porous plate filter and is removed, but most of it passes through the small pores of the porous plate filter and flows into the stream side. and is much smaller than the size of the pores in the perforated filter]] and is trapped and removed by the permeable ventilation net. Therefore, if the snow that has entered the air supply section Ill d blows directly onto the air supply filter and clogs it, #H
:1 There is no risk of causing blockage.

(Example) Hereinafter, a 1/M example will be explained with reference to the drawings. Note that the 194-air air conditioner according to the present invention is characterized by the configuration of the outside air intake area, and other features are the same as those of the conventional device, so only these features will be illustrated and explained in the drawings below. Also, the names of device elements that are not common are given the same symbols as in the conventional example.

In Fig. 1, a louver 2 is attached to the outside air intake 1a installed on the side wall of the NZ building 1 of the plant equipment to prevent rainwater from entering, and a precise filtration system is installed downstream of the louver 2. A supply air filter 4 is equipped. Furthermore, a large number of small holes 15 are provided in the flow path between the outside air intake port 1a and the air supply filter 4.
A perforated plate filter 15 with holes a is provided in a transverse state, and a mesh-like ventilation net i 16 is attached opposite to the downstream side of the perforated plate filter 15.

The porous plate filter 15 may be a flat perforated plate as shown in the cross-sectional view of FIG. 1, but if the plate material is bent and formed as illustrated in FIG. Compared to a perforated plate, the section modulus is increased and the strength is improved.

In addition, the ventilation net 1 16 is made of materials such as fiber braid, metal, synthetic resin, etc., arranged in a mesh pattern and molded. It is selected as appropriate in consideration of the pressure loss of the airflow outside the person. The ventilation net 16 is selected to have an opening of -[1] depending on the snow condition 11, which is within the range of openings equivalent to 16 to 24 meshes based on the sieve mesh standard. In addition, the cross-sectional area of the frame casing 2a, which is the installation location of the perforated plate filter 15 and the ventilation net 1-16 and serves as an inflow path for outside air, is such that the average flow velocity of the outside air taken in is 1.
．． Set it so that it is 5m and 10 seconds or less.

In the above configuration, large, high-moisture snowflakes that are entrained by the outside air and blown into the louver 2a through the gap in the louver 2 attached to the outside air intake 11a are filtered through the porous plate filter 1.
It collides with 5 and is removed. -・Fine powder snow with low humidity is partially filtered through the perforated plate filter 15 as well as larger snowflakes.
However, other powder snow passes through the small holes 15a and flows in the first direction, and is then captured by the ventilation net 16. By the way, if the average flow velocity of the outside air near the ventilation net 16 is about 1.5 m/sec, the odor ζ is about 30.
Invading snow is divided by 1 at a capture rate of 50%, and when the average flow velocity is about 2.5 mfjj seconds, the capture rate remains at about 5%, demonstrating that the capture rate is generally better when the average flow velocity is small. has been done. Therefore, in order to maintain good snow trapping efficiency, the average flow velocity of the introduced outside air is preferably 1.5 m/sec or less.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a 1gi side view showing an embodiment in which the ventilation net in the embodiment shown in FIG. 1 is formed by laying a plurality of belt-shaped ventilation net elements 16a on the rear surface of the perforated plate filter 15. That is, multiple ventilation nets! -Each ventilation net ff11 that vertically adjoins the element 16a
6a are arranged so as to partially overlap each other, and the upper edge of each ventilation net element 16a is fixed to the rear surface of the porous plate filter 15 to form a ventilation net.

In the above configuration, the fine snow powder 17 that has passed through the small holes 15a of the porous plate filter 15 is transferred to the belt-shaped ventilation net element 16a.
collides with and falls downward. In addition, when the outside air blowing speed momentarily increases, the ventilation net element 16a
As shown in the figure, the perforated plate filter 15 is
At this time, the snow masses accumulated between the perforated plate filter 15 and the ventilation net element 16a are peeled off and dropped upward and downward (!), thereby preventing clogging of the ventilation net itself.

Although not shown in the drawings as an example of this embodiment, when installing in an area where there is a lot of particularly fine powder snow, a ventilation net 16 is placed in front of the primary filter of the perforated plate filter 15. The plate filter 15 may be used as a branch 'I material of the ventilation net I/16. In yet another embodiment, if ventilation nets 1G are stretched on both the front and rear surfaces of the C1 porous plate filter 15, the intrusion of powder snow can be more efficiently prevented.

Although Example C is exemplified as a ventilation air conditioner in a nuclear power plant, the application of the device of the present invention is not limited to this, but can also be applied to ventilation air conditioners of other plant equipment installed in snowy areas. Needless to say, it's a monkey.

〔Effect of the invention〕

As is clear from the above explanation, in the J3 ventilation air conditioner of the present invention, a perforated plate filter with many small holes is placed between the outside air intake and the supply air filter! l! At the same time, a mesh (1-shaped ventilation net) is placed opposite the perforated filter, so that the snow that has been carried away when the outside air passes through the perforated filter and the ventilation net is efficiently removed. This makes it possible to remove the snow well and prevent the air supply filter from becoming clogged with snow.

Therefore, even in areas with heavy snowfall, it is possible to provide highly reliable ventilation with fewer accidents caused by snow.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the ventilation room conditioning 2 according to the present invention, Fig. 2 is a front view of the perforated plate filter, and Fig. 3 is the
Fig. 4 is a sectional view showing another embodiment of the present invention, and Fig. 5 shows a state in which the ventilation net is floating. Figure 6 shows a conventional ventilation air conditioning system.
FIG. 7 is a perspective view of one plant building showing the louver mounting position t, and FIG. 8 is a sectional view taken along the line vm-vm in FIG. 7. 1...ll'p111a...Outside air intake, 2...
Louver, 2a...Structure casing, 3...Air supply processing device 14...Air supply filter, 5...Heating coil, 6
...Cooling coil, 7...Air supply duct! ~, 8... Air supply fan, 9... Air conditioned space, 10... IJF air processing Pi39 (, 11... Exhaust gas 1~.12... Exhaust fan, 13... Ji cylinder, 14... Exhaust filter, 15... Porous plate filter, 16... Ventilation net,
15a... Small hole, 16a... Ventilation net element, 17
···snow. Applicant's agent Hisashi Hatano

Claims (1)

[Claims] 1. In a ventilation air conditioner that introduces outside air from an outside air intake provided in a building of plant equipment into a supply air filter, removes foreign matter contained in the outside air, and sends the air to an air-conditioned space. ,
A ventilation air conditioner characterized in that a perforated plate filter having a large number of small holes is provided between an outside air intake port and a supply air filter, and a mesh-like ventilation net is further attached opposite to the perforated plate filter. 2. The ventilation net is formed so as to cover the entire rear surface of the perforated plate filter by fixing the upper edges of a plurality of net elements formed in a band shape to the rear surface of the perforated plate filter. Air conditioner.