JPH04890Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air filter useful as a filter installed in an air passage through which cold air cooled by a cooling device or cold air such as outside air in a cold region passes.

[Conventional technology]

Conventionally, there has been no special additional means for preventing the filter medium of the filter installed in the air conditioning air passage for blowing cold air from freezing or becoming moist due to the cold air flowing through it. Generally, the installation of filters where cold air passes is avoided as much as possible, and filters are installed downstream of the cold air preheating coil and reheating coil.

[Problem that the invention attempts to solve]

However, in air channels where there is no heating process such as preheating or reheating the cold air, such as an air conditioning air channel that supplies cold air to a freezer or refrigerator compartment, a filter must be inserted in the area through which the cold air passes. In such cases, the filter media may freeze or become wet, resulting in a significant drop in the purification performance of the filter, or in the worst case scenario, ventilation may become impossible and air conditioning operation may no longer be possible. In some cases, this resulted in a situation where the filter became unusable.

In particular, high-performance filters called HEPA filters are used in fields that require high cleanliness, such as biochemistry, but these high-performance filters are extremely resistant to freezing and moisture. In particular, the above-mentioned problems were becoming more prominent.

An object of the present invention is to provide an air filter that can effectively prevent the filter medium from freezing or becoming wet due to cold ventilation, thereby increasing the purification performance of the filter.

[Means for solving problems]

The characteristic configuration of the air filter according to this invention is as follows:
The filter frame has a hot air outlet for drying the filter medium facing the side surface of the filter medium, and its functions and effects are as follows.

[Effect]

By heating the filter media, it is attempted to prevent or effectively suppress freezing and wetting of the filter media, and in particular, drying the filter media by blowing hot air for drying the filter media onto the filter media. Therefore, the drying of the filter medium can be promoted by the synergy between the heating effect of the filter medium by the hot air and the moisture absorption effect from the filter medium and its atmosphere. Furthermore, in order to blow the hot air for drying the filter media onto the filter media, the hot air is blown toward the side of the filter media from the outlet formed in the filter frame facing the side of the filter media, so the hot air is blown onto the entire filter media. By permeating the filter material, the entire filter medium can be evenly dried, and it can also be handled as a filter with an air outlet, simplifying the structure for installing it into the air path and allowing it to be installed with good workability.

[Effect of idea]

Therefore, the present invention has become able to provide an air filter that can prevent the filter medium from freezing and becoming wet, has excellent filter performance, and is easy to assemble.

In particular, as will be shown in the examples below, when using a filter frame with a hollow structure that forms a hot air supply path to the air outlet inside, the structure of the hot air supply system can be simplified, and the filter Focusing on the fact that the air inflow port side is more likely to freeze and become wet, if the air outlet is formed so as to face a location that is biased towards the air inflow port side, the drying of the filter medium will be further improved. It can be done efficiently.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the air conditioning equipment for a refrigerator or freezer compartment 1 (hereinafter referred to as the target room) that requires high indoor cleanliness, and includes two air conditioners 2A, which operate alternately with each other.
It is equipped with 2B.

The first air conditioner 2A and the target room 1 are the first return air path 3
A first circulating air path 3 consisting of a and a first air supply path 3b
Also, the second air conditioner 2B and the target room 1 are connected to each other via a second air conditioner 2B and a second air conditioner 2B consisting of a second return air path 4a and a second air supply path 4b.
The circulation air passages 3 and 4 are connected to each other through return air ports 5A and 5, respectively.
B, return air automatic damper 6A, 6B, air supply fan 7
A, 7B, automatic air supply damper 8A, 8B, air supply port 9
It is equipped with A and 9B.

Each air conditioner 2A, 2B has a direct expansion cooling coil 10A, 10B on the upstream side in the air passage in its casing.
Also, high-performance filters 11A, 11 are installed on the downstream side.
It has B.

Each direct expansion cooling coil 10A, 10B is connected to the first and second air-cooled heat pump devices 12A, 12B respectively, and each connecting refrigerant pipe 13A, 13B is provided with an automatic refrigerant valve 14A, 14B, respectively. be.

Further, the direct expansion cooling coils 10A and 10B are each equipped with electric heaters 15A and 15B for defrost operation, while each high performance filter 1
It consists of an air filter F equipped with filter medium drying means 1A and 11B.

The air filter F is shown in FIGS. 1 and 2.
As shown in the figure, a filter medium 16C made of glass fiber is arranged in a filter medium arrangement space surrounded by an annular filter frame 16A, along with a plurality of separators 16B distributed and arranged at intervals. On the inner circumferential surface of the filter frame 16A, a plurality of outlets 16a of hot air for drying the filter medium are connected to the filter medium 16C at locations facing each other in the longitudinal direction of the separator 16B and toward the air inlet side. It is formed facing the side. and,
The filter frame 16A has the air outlet 1 inside.
The separator 16B has a hollow structure forming a hot air supply path 16b to the separator 6a, and a large number of holes for ventilation are formed in the separator 16B. Note that a guide 16C is attached to the filter frame 16A to regulate the blowing direction of the air outlet 16a in an oblique direction toward the air outlet side.

Also, air filter F has air outlet 16C.
By blowing hot air toward the side surface of the filter medium 16C, the hot air permeates into the filter medium 16C, heats the filter medium 16C, and absorbs moisture from the filter medium 16C to dry the filter medium 16C. It is structured as follows. Note that the separator 16B is made by bending paper or an aluminum plate into a zigzag shape.

In the figure, 17 indicates a hot air path 1 connected to the hot air supply path of the filter frame 16A in the interior high performance filters 11A, 11B, [F] of the air conditioners 2A, 2B.
8A and 18B are equipped with automatic hot air dampers 19A and 1, respectively.
9B is inserted.

The hot air generator 17 has a structure in which outside air is taken in by a fan 17B via a prefilter 17A, heated by an electric heating coil 17C, purified by an interior high-performance filter 17D, and then supplied to a heating drying means.

In addition, each air conditioner 2A, 2B includes a steam exhaust path 21A with automatic exhaust valves 20A, 20B for exhausting steam generated in the casing during defrost operation,
21B, and automatic exhaust valves 20A and 20 that exhaust steam generated within the casing during defrost operation.
Steam exhaust passages 21A and 21B with B, and filters 22A and 21B in the casing during defrost operation.
Automatic air supply valve 23 that takes in outside air via 22B
Outside air intake passages 24A and 24B with traps 25A and 23B are connected, and drain pans 27A and 27B that lead drain water to drains 26A and 26B with traps 25A and 25B are equipped with electric heaters 28A to prevent freezing. , 28B is attached.

Each steam exhaust path 21A, 21B is connected to an exhaust unit 29 for defrost operation, and the exhaust steam is purified by an internal high-performance filter 29A and discharged to the outside of the system by a fan 29B.

Furthermore, the internal high-performance filter 29A of the defrost operation exhaust unit 29 is provided with a hot air nozzle 30 that blows hot air onto the filter material and heats and dries the filter material, and the hot air nozzle 30 is also equipped with an automatic hot air damper. It is connected to the hot air generator 17 by a hot air passage 32 with a hot air passage 31 interposed therebetween.

On the other hand, as an exhaust system for the target chamber 1 and its front chamber 1a, an exhaust port 33 provided in each chamber 1, 1a is used.
The exhaust passages 33 from the chambers 1 and 33B are connected in parallel to the first exhaust unit 34A and the second exhaust unit 34B via automatic exhaust dampers 35A and 35B, respectively. The exhaust gas is purified by high-performance filters 36A, 36B inside the exhaust units 34A, 34B, and then discharged to the outside of the system by fans 37A, 37B.

In this example, the equipment configuration is suitable for air conditioning the target room 1 while maintaining it at a predetermined negative pressure.

Hot air nozzles 38A, 38B are also provided for the interior high performance filters 36A, 36B of the first and second exhaust units 34A, 34B, respectively, as described above, and these hot air nozzles 38A, 38B are also equipped with hot air automatic dampers as described above. They are each connected to the hot air generator 17 through hot air paths 40A and 40B with 39A and 39B interposed therebetween.

The door 41 of the target room 1 is attached with an electric heater 42 that heats the peripheral edge thereof. Also, target room 1
Inside, a first room temperature sensor 43A for controlling the operation of the first air conditioner 2A, a second room temperature sensor 43B for controlling the operation of the second air conditioner 2B, and
Fans 37A, 3 of exhaust units 34A, 34B
A room pressure sensor 43C is attached for controlling the room pressure by 7B.

The alternating operation of the first and second air conditioners 2A and 2B is automatically performed by switching control using a timer, and in this automatic alternating operation, automatic dampers and automatic valves are When one air conditioner system is put into air conditioning operation, the other air conditioner system is automatically put into defrost operation by the automatic switching operation and the automatic start/stop operation of each attached device.

That is, when the system of the first air conditioner 2A is in the air conditioning operation state, the automatic return air damper 6A, the automatic supply air damper 8A, the automatic refrigerant valve 14A, and the first exhaust unit 34A of the system of the first air conditioner 2A are activated. At the same time, the damper 35A of the first air conditioner system, the first air cooling heat pump device 12A, and the fan 37A of the first exhaust unit 34A are operated, and the defrost operation is executed at that time. In the system of the second air conditioner 2B, the second air conditioner 2B is
The automatic hot air dampers 19B, 39B, 31 of the air conditioner 2B, the second exhaust unit 34B, and the defrost operation exhaust unit 29 are opened, and
The automatic exhaust valve 20 of the second air conditioner 2B is connected to the defrost operation exhaust unit 29 which is also in operation.
B and the automatic air supply valve 23B are opened, and furthermore, the electric heating motor 15B for the direct expansion cooling coil 10B of the second air conditioner 2B is turned on. Then, all other automatic dampers, automatic valves, and attached devices are closed or stopped.

Furthermore, the electric heaters 28A, 2 for the drain pans 27A, 27B of the first and second air conditioners 2A, 2B
8B and the electric heater 42 for the door 41 of the target room 1 are normally maintained ON.

On the other hand, when the system of the second air conditioner 2B enters the air conditioning operation state due to automatic alternate operation, the automatic return damper 6B, automatic supply air damper 8B, automatic refrigerant valve 14B, and automatic refrigerant valve 14B of the system of the second air conditioner 2B are activated. The automatic exhaust damper 35B for the second exhaust unit 34B is opened, and the air supply fan 7B of the second air conditioner system is opened.
and the second air-cooled heat pump device 12B, and the second
The fan 37B of the exhaust unit 34B is operated,
On the other hand, in the system of the first air conditioner 2A in which the defrost operation is executed at that time, the first air conditioner 2A, the first exhaust unit 34A, and the exhaust unit 12 for the defrost operation are connected to the hot air generator 17 that is in operation. 29 respective hot air automatic dampers 19A, 39
A, 31 is opened, and the first exhaust unit 29 for defrost operation is also opened.
Automatic exhaust valve 20A and automatic air supply valve 23 of air conditioner 2A
A is opened, and furthermore, the electric heater 15A for the direct expansion cooling coil 10A of the first air conditioner 2A is turned on. And other automatic dampers and automatic valves,
Additionally, all attached equipment is closed or stopped.

Note that the defrost operation is started when the air conditioning operation is switched between the first air conditioner 2A and the second air conditioner 2B.
The defrost operation is stopped by independent timer control.

That is, after the defrost operation is started in one air conditioner system as described above in conjunction with the air conditioning operation switching, when the predetermined defrost operation time has elapsed, the hot air generator 17, for the defrost operation is started before the next air conditioning operation switching. The operation of the exhaust unit 29 and the direct expansion cooling coil electric heaters 15A, 15B is automatically stopped, and the automatic dampers and automatic valves 19A, 39A, and 39B related to the defrost operation are automatically stopped.
B, 31, 20A/B, 23A/B are automatically closed and the defrost operation is completed.

Hot air nozzles 38A, 38B for the interior high performance filters 36A, 36B of the first and second exhaust units 34A, 34B, and the interior high performance filter 29 of the defrost operation exhaust unit 29
As shown in FIG. 4, each of the hot air nozzles 30 for A has an annular shape corresponding to the frame 44 of the target filter F'. A circumferential internal hot air flow path f and a hot air path connection port 46 therefor are formed, and the hot air is directed from the internal hot air flow path f toward the center axis of the annular shape, and one side of the center axis direction is formed. A large number of hot air blowing holes 47 that blow out in a direction inclined at a predetermined angle are arranged in parallel on the inner circumference of the annular hot air nozzle body 45.

In other words, in the air passages inside the casings of the first and second air conditioners 2A and 2B, the direct expansion cooling coils 10A and 10B
The cold air cooled by the air passes through the air passages inside the casings of the first and second exhaust units 34A and 34B, and the cold air exhausted from the target chamber 1 passes through the air passages inside the casings of the first and second exhaust units 34A and 34B.
In the air passage inside the casing of the exhaust unit 29 for defrost operation, the residual cold air and moist steam in the air conditioner casing pass through, so the high-performance filters F and F' installed in the air passage inside the casing pass through the cold air. There is a concern that the filter media 16C, 48 may freeze or become wet due to this.

Therefore, hot air is blown onto the filter media 16C and 48 from the air outlet 16a in the high performance filter F of the air conditioners 2A and 2B, and from the hot air outlet 47 in the other high performance filter F'. .
By applying sufficient heat to C, 48 to heat and dry it, the filter medium 16 can be heated while avoiding adverse effects on temperature control with respect to cold air.
C, 48 is prevented or effectively suppressed from freezing or wetting, thereby filter media 16C, 4
8 is maintained in a dry state that can exhibit sufficient purification performance regardless of the passage of cold air, so that good air conditioning operation can be continued.

Also, during defrost operation, the direct expansion cooling coil 10
Together with the steam generated as the ice melts in A and 10B, the humid air generated as a result of heating and drying the high-performance filters 11A and 11B is transferred to the steam exhaust passages 21A and 21.
By discharging the air from inside the air conditioner casing using B, the high-performance filter 11 caused the generated steam and generated humid air to remain inside the casing.
Preventing refreezing and rewetting in A and 11B, thereby making it possible to maintain the purification performance of high-performance filters 11A and 11B more effectively by heating and drying the filter media as described above. There is.

[Another example] Another embodiment of the present invention will be shown below.

In the above embodiment, the present invention is applied to the internal high-performance filters 11A and 11B of the air conditioners 2A and 2B, but the present invention is applied to the internal high-performance filter 29A of the exhaust unit 29 for defrost operation and the first and second exhaust units 34A and 34B. Interior high performance filter 36
It can also be applied to A and 36B. In short, this invention can be applied to any filter that is likely to freeze or become moist due to passing cold air, regardless of whether it is installed anywhere in the air conditioning system or used for purposes other than air conditioning. can.

The model and purification performance class of the target filter are not concerned.

The hot air may be heated steam as well as heated air. In short, various gases can be used.

In the above embodiment, the air outlet 16a was formed on the inner surface of the filter frame 16A at a location opposite to the separator 16a in the longitudinal direction, but as shown in FIG. Of these, it may be provided only at locations facing the separators 16a in the direction of juxtaposition, or may be provided all around the inner surface of the filter frame 16A.

Furthermore, in the above embodiment, the outlet 16a was provided at a location that was biased towards the air inflow port, and the outlet direction was set to be diagonal. It's okay,
In addition, a plurality of blow-off ports 16a may be provided at intervals in the flow direction of the airflow, and the blow-off direction may be
The direction may be perpendicular to the flow direction of the airflow or an oblique direction toward the air inlet.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the air filter according to the present invention, FIG. 1 is a longitudinal sectional view of the air filter, FIG. 2 is a partially cutaway plan view of the air filter, and FIG. 3 is an air conditioner. Equipment piping system diagram,
FIG. 4 is a perspective view of the filter, and FIG. 5 is a longitudinal sectional view of an air filter showing another embodiment of the present invention. 16A... Filter frame, 16a... Air outlet,
16C... Filter material, 16b... Hot air supply path.

Claims (1)

[Claims for Utility Model Registration] 1. An air filter in which a filter frame 16A is formed with a hot air outlet 16a for drying the filter medium facing the side surface of the filter medium 16C. 2. The air filter according to claim 1, wherein the filter frame 16A has a hollow structure in which a hot air supply path 16b to the blower outlet 16a is formed inside the filter frame 16A. 3. The air filter according to claim 1 or 2, wherein the air outlet 16a is provided at a location that is biased toward the air inflow port.