JPH04225731A - Air conditioning unit - Google Patents

Abstract

PURPOSE:To provide an air conditioning unit wherein cleanness in a room is free to be contaminated and wherein it can easily deal with an alteration of partitioning in the room. CONSTITUTION:The title unit comprises a prefilter 2 which captures particles in air supplied into a room 24 and which is disposed replaceably, an air condenser 3 which is located below the foregoing prefilter 2 for removal of sensible heat of the air, a fan 4 which is located below the air condenser 3 for directing the air downward, and a HEPA filter 5 which is located below the fan 4 in an air tight manner for capturing particles in the air.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning unit that removes particles and sensible heat from air to be supplied into a room.

0002

2. Description of the Related Art Air to be supplied to a clean room or the like must be supplied into the room after removing particles from the air and cooling the air from being heated by a heat source within the clean room. Until now, there has been no air conditioning unit configured as a single unit for use for such purposes.

[0003] In other words, conventional air conditioning equipment for the purpose of removing dust and sensible heat from the air has been equipped with an air chamber in the ceiling (the space between the ceiling and the concrete slab above), and an air chamber in the lower surface of the air chamber. Arrange the required number of units consisting of the installed filters, open the bottom of each filter to the ceiling of the room, and usually install one unit each in a central room where the blower and air cooler can be easily inspected separately. , the blower and air cooler were connected to the air chamber of each unit by a duct.

0004

[Problems to be Solved by the Invention] Firstly, in the conventional air conditioning equipment described above, when the filter becomes clogged, it becomes necessary to replace the filter, and therefore, the filter needs to be detachably attached to the lower surface of the air chamber. be. For this reason, the filter must be replaced during normal operation, and the possibility of loss of airtightness at the filter installation site cannot be completely eliminated, and if a leak occurs at the filter installation site, the Air is supplied indoors bypassing the filter, and therefore the possibility of deteriorating the cleanliness of the indoor air cannot be eliminated.

Second, when a single room is divided into two rooms, the existing blower and air cooler are used only in the first room, and the existing blower and air cooler are used only in the first room. It becomes necessary to add one blower and one air cooler for the installation, and if the building was not designed with the additional space for installation taken into consideration from the beginning, there is a risk that there is no way to deal with this. In addition, regarding the ducts that were supplying the air chambers of each unit in both rooms, the duct route from the existing blower to the unit for the second room was removed, and a new blower was installed instead to the unit for the second room. Similarly, a new cooling system for the air cooler had to be installed for the newly installed air cooler, which ended up requiring equipment installation and duct/piping work. Changes and new installation work were forced, and it could not be said that there was a high level of flexibility in responding to changes in indoor partitions.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air cooling unit that does not pose a risk of deteriorating the cleanliness of the room and can easily accommodate changes in the partitions in the room.

[0007]

[Means for Solving the Problems] The present invention includes a pre-filter that collects particles in the air to be supplied into a room and is arranged in a replaceable manner, and a pre-filter that is arranged below the pre-filter and collects particles in the air to be supplied indoors. An air cooler consisting of an air cooler to be removed, a fan disposed below the air cooler to blow the air downward, and a HEPA filter airtightly disposed below the fan to collect particles in the air. The harmonization unit achieves the above objectives.

[0008]

[Operation] Dust removal from the air is performed by a pre-filter and a HEPA filter, but since the pre-filter is disposed on the upstream side of the air flow, clogging due to dust removal occurs exclusively in the pre-filter. Since the pre-filter is disposed at the top of each air conditioning unit, a clogged pre-filter can be easily replaced with a new pre-filter.

[0009] Since dust removal from the air is carried out exclusively by the pre-filter, clogging of the HEPA filter is significantly reduced.
The frequency of replacing HEPA filters due to clogging is significantly lower than that of pre-filters, and HEPA filters are not required for normal operation.
It is no longer necessary to consider replacing the PA filter, and therefore the HEPA filter can be mounted airtight on the fan, so that the air pumped into the room by the fan always passes through the HEPA filter, thus improving the cleanliness of the indoor air. There is no risk of worsening the condition.

[0010] Furthermore, since each air conditioning unit independently functions to remove dust and cool the air, when changing the partitions in a room, it is necessary to add more air conditioning units.
Alternatively, it is only necessary to adjust the flow rate of cooling water passing through the secondary side of each air cooler, and no other special construction is required.

[0011]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings. In FIG. 1, the air conditioning unit 1 consists of a pre-filter 2, an air cooler 3, a fan 4, and a HEPA filter 5, and the pre-filter 2, air cooler 3, fan 4, and HEPA filter 5 are arranged below in that order. The concrete slabs 20 and the ceiling 21 are stacked on top of each other and are supported by the support frame 6.
It is located at 2. The support frame 6 is fixed to a support fitting 23 suspended from the concrete slab 20.

The prefilter 2 collects particles contained in the air supplied to the room 24, and is placed on a stepped surface formed on the support frame 6 so that it can be easily replaced. The air cooler 3 removes only the sensible heat of the air, and therefore does not require a drain pan, and therefore also allows for vertical air flow as in this embodiment. In this embodiment, a plate-fin type heat exchanger is used as the air cooler 3. The fan 4 blows air vertically downward, and although it is generally preferable to use an axial fan, a centrifugal fan can also be used. Like the pre-filter 2, the HEPA filter 5 collects particles contained in the air, and its outer frame 7
is airtightly fixed to the support frame 6, and in normal operation it is set to H.
Replacement of the EPA filter 5 is not considered. That is, in addition to being able to bolt the outer frame 7 to the support frame 6,
It is also possible to weld. In the latter case, HEP
When the A filter 5 is clogged, the H
The EPA filter 5 or the entire air conditioning unit 1 will be replaced. The lower surface of the HEPA filter 5 is flush with the opening in the ceiling 21, and in this embodiment, a diffuser 8 is attached to the opening in the ceiling 21 to make the flow of air in the room turbulent. However, depending on the indoor cleanliness class and heat load, the air conditioning units 1 without the diffuser 8 may be arranged densely to make the indoor air flow laminar.

FIG. 2 shows an installation example of the above embodiment, in which the air in the room 24 reaches the outside through the intake hole 26 opened at the bottom of the floor 25, rises between the return air partitions 27, and reaches the ceiling 22. After reaching the room and being cooled and dusted by the air conditioning unit 1 placed in the ceiling ceiling 22, the room returns to the room 24 again. That is, since the ceiling space 22 is used as a return air chamber and the return air partition 27 is used as a duct, there is no need for a normal air conditioning duct or air conditioning machine room.

Returning to FIG. 1, a three-way switching valve 12 that is switched and controlled by an actuator 13 is installed between the cooling water pipe 10 and the cooling water main pipe 11 on the secondary side of the air cooler 3. The three-way switching valve 12 controls the flow rate of cooling water passing through the secondary side of the air cooler 3. That is, the three-way switching valve 12 switches between a cooling water flow path that passes through the secondary side of the air cooler 3 and a cooling water flow path that bypasses the secondary side of the air cooler 3. The switching of the flow paths is performed in units of a fixed cycle time, for example, 10 seconds, as shown in FIG. 3.

In other words, when the flow path of the cooling water passing through the secondary side of the air cooler 3 is opened and the bypass flow path is closed, it is called "open", and the cooling water passing through the secondary side of the air cooler 3 is called "open". When the water flow path is closed and the detour flow path is opened, it is called "closed", and when there is no cooling load, it is closed for all 10 seconds, and therefore the closed state is maintained throughout each cycle. When the cooling load is small, it is opened for, say, 2 seconds out of 10 seconds and closed for the remaining 8 seconds.As the cooling load increases, the opening time becomes longer and the closing time shortens accordingly, until the cooling load reaches the maximum. When , it is open for all 10 seconds, and therefore remains open throughout each cycle.

Note that the flow rate of cooling water passing through the secondary side of the air cooler 3 can be controlled by a control valve that continuously controls the flow rate. Since the linearity of the cooling water flow rate with respect to the increase/decrease signal is not necessarily optimal, this embodiment uses ON-OFF control for each cycle time as described above.

The present embodiment is constructed as described above, and since clogging due to dust removal occurs exclusively in the easily replaceable pre-filter 2, the HEPA filter 5 will not become clogged over a long period of time, for example, over the service life of the air conditioning unit 1. Therefore, the HEPA filter 5 can be airtightly attached to the fan 4, and as a result, there is no risk of deteriorating the cleanliness of the air in the room 24. Furthermore, when changing the partition 27 in the room 24, it is only necessary to change the signal line to the actuator 13 of the three-way switching valve 12 attached to the cooling water pipe of each air cooler 3, and no special construction is required. .

[0018]

According to the present invention, an air conditioning unit is provided which does not pose a risk of deteriorating the cleanliness of the room and can easily accommodate changes in the partitions of the room.

[Brief explanation of the drawing]

[Fig. 1] A vertical cross-sectional view showing one embodiment of the present invention.

[Fig. 2] A vertical cross-sectional view showing an installation example of the embodiment.

FIG. 3 is a diagram showing a method for controlling the flow rate of cooling water in the air cooler of the embodiment.

[Explanation of symbols]

1...Air conditioning unit 2...Pre-filter
3...Air cooler 4...Fan 5...HEPA
Filter 6...Support frame 7...Outer frame 8...Diffuser 10...Cooling water piping 11...Cooling water main pipe 12...3-way switching valve 13...Actuator 20...Concrete slab 21...Ceiling 22...Ceiling corner 23...Support metal fittings 24...Indoor
25...Floor surface

Claims (3)

[Claims] 1. A pre-filter that collects particles in the air to be supplied into a room and is replaceably arranged; an air cooler that is arranged below the pre-filter and removes sensible heat from the air; An air conditioning unit comprising a fan disposed below an air cooler to blow the air downward, and a HEPA filter disposed airtightly below the fan to collect particles in the air. 2. The air conditioning unit according to claim 1, wherein a valve for regulating the flow rate of the cooling water passing through the secondary side of the air cooler is attached to the cooling water flow path. 3. The valve is constituted by a three-way switching valve that switches between a cooling water flow path passing through the secondary side of the air cooler and a cooling water flow path bypassing the secondary side. The channel switching is performed by opening the cooling water channel that passes through the secondary side of the air cooler for a certain period of each cycle time, and closing the bypass channel for a certain period of each cycle time. During the remaining time, the cooling water flow path passing through the secondary side of the air cooler is closed and the detour flow path is opened, and
3. The air conditioning unit according to claim 2, wherein the length of the certain period of time in each cycle time is controlled to increase or decrease depending on the cooling load.