JP2586866B2 - Well-balanced draft chamber with integrated air conditioning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents various harmful substances such as gas or dust generated in the course of chemical experiments from diffusing into a laboratory and contaminating the human body. Further, the present invention relates to a draft chamber which is an experimental equipment capable of smoothly discharging these.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned draft chamber has the following structure. (1) General type A configuration in which the inside of the chamber is forcibly evacuated by an exhaust fan, and the air is supplied to the chamber by suctioning 100% of the room air.

(2) Air curtain type The outside air is supplied by an air supply fan, an air curtain is formed at the front opening of the draft chamber by this air supply, and the inside of the chamber is forcibly exhausted by an exhaust fan. thing.

(3) Push-pull type The concept of supply and exhaust is the same as that of the air curtain type.
The amount of air exhausted by the exhaust fan is made larger than the amount of air supplied by the air supply fan, and the shortage of air supply is sucked from the room,
Higher degree of isolation between chamber and laboratory.

[0005]

Among the above-mentioned conventional draft chambers, in the general type, the supply / exhaust balance in the room changes depending on whether the draft chamber for sucking room air is in operation or not. Therefore, it was necessary to take measures such as controlling the air flow rate on the air conditioning equipment side.

In the air curtain type and the push-pull type, since the outside air is introduced by an air supply fan when the draft chamber is operated, it is not necessary to control the air volume on the air conditioning equipment side, but the outside air is introduced directly. Therefore, there is a problem that a temperature difference is generated between the room and the room, the temperature of the sample during the experiment changes, and the experimenter feels discomfort such as cold draft.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and reduces the load on the air conditioning equipment.
It is an object of the present invention to obtain a well-balanced draft chamber integrated with air conditioning that can comfortably improve an experimental work environment.

[0008]

In order to solve the above-mentioned problems, a well-balanced draft chamber integrated with an air conditioner according to the present invention comprises: a draft duct for introducing outside air into a draft chamber through a draft fan; An exhaust duct for exhausting air in the chamber through an exhaust fan, and a draft chamber that forms an air curtain at a front opening of the draft chamber with outside air introduced through the air supply duct. The total air supply introduced through the air duct is made equal to the total exhaust air exhausted through the exhaust duct, and a part of the air supply is supplied from the air supply duct to the indoor air blower. The air is blown into the room through the outlet, and the air amount corresponding to the air is sucked from the room into the draft chamber through the front opening, and the air is supplied to the room. Utilization-side heat exchanger in the duct, is characterized in that the heat source-side heat exchanger becomes comprise respectively disposed the heat pump in said exhaust duct.

[0009]

The well-balanced draft chamber integrated with air conditioning according to the present invention makes the total air supply amount and the total exhaust air amount equal as described above, blows a part of the air supply into the room, and converts the indoor air corresponding to that amount into the room. The suction into the chamber prevents the diffusion of harmful gas and dust to the indoor side, and at the same time, the supply / exhaust balance in the room can be maintained irrespective of operation or non-operation.

[0010] In addition, since a use side heat exchanger of a heat pump is provided in the air supply duct to supply air-conditioned air, it is possible to prevent temperature fluctuations in the room.
The temperature of the sample during the experiment and its surroundings can be kept within a certain range, and the cold draft in the draft chamber of the experimenter can be eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. As shown in the drawing, the outside air introduced from the air supply fan 2 through the air supply duct 3 to the draft chamber 1 is drawn into the air curtain from the air curtain outlet 5 provided in the front opening 4 of the draft chamber. Mouth 6
The air is supplied by blowing the air toward the draft chamber 1, while the air in the draft chamber 1 can be exhausted by the exhaust fan 8 through the exhaust duct 7.

Here, 75% of the total air supply is supplied to the air curtain outlet so that the total air supply introduced through the air supply duct 3 and the total exhaust air exhausted through the exhaust duct 7 become equal. 5 blows out into draft chamber 1, another 25%
Air outlet 1 that communicates air from air supply duct 3 to room 9
The air is blown into the room 9 through 0.

As described above, the total supply amount and the total exhaust amount are made equal, and the supply / exhaust amount in the draft chamber 1 caused by blowing a part of the supply amount into the room is unbalanced.
The air in the room 9 is balanced by sucking 25% of the air from the front opening 4 of the draft chamber 1 and
This prevents harmful substances generated in the draft chamber 1 from diffusing into the room 9.

The use side heat exchanger 11 provided in the air supply duct 3 and the exhaust duct 7 branched from the air supply duct 3.
A heat pump 15 is constituted by a heat source side heat exchanger 12 provided in an exhaust duct 16 connected to the compressor, a compressor 13 and a four-way valve 14, so that the supplied external air can be cooled or heated.

According to the above configuration, the total air supply amount and the total exhaust air amount are made equal, and a part of the air supply is blown out from the room air outlet 10 into the room 9 to thereby reduce the amount of air blown into the room. Is drawn into the draft chamber 1 from the front opening 4 by an amount corresponding to
Regardless of whether the air conditioner is in operation or not, the air balance in the room can be maintained, the fluctuation of the air conditioning load can be reduced, and the effect of preventing harmful substances generated in the draft chamber 1 from diffusing into the room can be enhanced. be able to.

In the summer, the refrigerant circulation direction of the heat pump 15 is set to a solid arrow direction by the four-way valve 14, and the use side heat exchanger 11 acts as an evaporator and the heat source side heat exchanger 12 acts as a condenser to cool the supply air. Then, the pumped heat is discharged to the exhaust side to perform cooling. On the other hand, in winter, the refrigerant circulation direction is set to the dashed arrow direction by the four-way valve 14, the use side heat exchanger 11 is used as the condenser, and the heat source side heat exchanger 12 is used as the heat source side heat exchanger 12. Since the heating can be performed by heating the supply air by acting as an evaporator, the outside air can be air-conditioned and supplied to the draft chamber 1. Therefore, the temperature of the experiment sample and the surrounding air can be maintained within a certain range, and the discomfort of the cold draft caused by direct exposure of the experimenter to the outside air can be eliminated.

Further, heat exchangers 11 and 12 for air conditioning are supplied and supplied.
Since it is arranged in the exhaust ducts 3 and 16 and uses a part of the air supply, it is not necessary to lay the refrigerant pipes constituting the heat pump 15 and to install space for the outdoor unit. Thus, the air conditioning in the draft chamber 1 can be realized smartly.

[0018]

As described above, according to the well-balanced draft chamber integrated with air conditioning according to the present invention,
The imbalance of indoor air between the operation and non-operation of the draft chamber and the fluctuation of the air conditioning load can be eliminated, so that the load on the air conditioning equipment can be reduced and the outside air can be air-conditioned by supplying air. Therefore, it is possible to prevent a change in the temperature of the specimen during the experiment and to improve and improve the experiment environment. Further, since the heat pump for air-conditioning the inside of the draft chamber is installed compactly, space saving and simplification of construction can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Draft chamber 2 Air supply fan 3 Air supply duct 4 Front opening 5 Air curtain outlet 6 Air curtain inlet 7 Exhaust duct 8 Exhaust fan 9 Room 10 Indoor air outlet 11 User side heat exchanger 12 Heat source side heat exchanger 13 Compressor 14 Four-way valve 15 Heat pump 16 Exhaust duct

Claims (1)

(57) [Claims] 1. An air supply duct for introducing outside air into a draft chamber through an air supply fan, and an exhaust duct for exhausting air in the draft chamber through an exhaust fan, wherein the air supply duct is provided. The total amount of air introduced through the air supply duct and the total amount of air exhausted through the exhaust duct in the draft chamber that forms an air curtain at the front opening of the draft chamber with the outside air introduced through And a part of the air supply amount is blown into the room from the air supply duct through an indoor air outlet communicating with the room, and the air amount corresponding to the air supply amount is blown out of the room through the front opening portion into the draft chamber. And a heat pump in which a heat source side heat exchanger is disposed in the exhaust duct, respectively. A well-balanced draft chamber with integrated air conditioning.