JP2594947B2 - Push-pull type cooling / condensing and recovery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is provided in a cleaning apparatus to efficiently collect vapor such as a volatile organic solvent, and to suppress the emission to a work area to prevent a work environment. The present invention relates to a push-pull type cooling / condensing / recovering device capable of keeping the pressure safely.

(Conventional technology and problems to be solved) Conventionally, an organic solvent is often used for cleaning a component such as a metal and a resin. This is a cleaning mainly performed for the purpose of degreasing, and generally uses a highly volatile chlorine-based organic solvent such as trichloroethylene or Freon-113. Although there are various cleaning methods using the organic solvent, the cleaning effect is enhanced by warm-bathing the object to be cleaned in the organic solvent or using the vapor of the organic solvent. These organic solvents are harmful to the human body,
In addition, since such cleaning is performed because it is an environmental pollutant, it is necessary to take measures to prevent the organic solvent from escaping out of the tank or diffusing into an outdoor or indoor working area.

FIG. 2 is an explanatory view showing a conventional example of a cleaning apparatus. This is an example of a cleaning apparatus having two cleaning tanks, an ultrasonic tank and a steam tank. In FIG. 1, reference numeral 1 denotes an ultrasonic tank, and reference numeral 2 denotes a steam tank. A cleaning liquid of an organic solvent is stored in the ultrasonic bath 1 and the steam bath 2. Reference numeral 3 denotes a vibrator provided at the bottom of the ultrasonic bath 1, and reference numeral 4 denotes a steam heater. 5 is a condensing coil provided on the upper inner wall surface of the washing tank for condensing the solvent vapor, and 6 is a water separator provided on the inner wall surface of the washing tank below the condensing coil 5.

The object to be cleaned is immersed in the ultrasonic bath 1 and placed above the steam bath 2 to be cleaned. During steam cleaning, solvent vapor condenses on the surface of the object to be cleaned, and dissolves and removes dirt such as oils and fats attached to the surface. The organic solvent stays as vapor in the upper part of the cleaning tank, but is cooled to a temperature lower than the dew point by the condensing coil 5 provided in the upper part of the cleaning tank and dropped into the cleaning tank. At this time, water vapor in the air is simultaneously condensed by the condensing coil 5, so that the condensed water and the solvent travel along the inner wall surface of the washing tank and are collected in the water separator 6. Separated,
Only the solvent is returned to the cleaning tank.

As described above, even in the conventional apparatus, harmful organic solvents and the like are considered so as not to escape to the outside of the cleaning tank.
These devices have the following two major problems, which are regarded as problems in many factories.

Although the temperature near the condensing coil 5 is low, the thermal conductivity of the air is low, so that the temperature near the center of the upper part of the washing tank where the organic solvent stays does not drop below the dew point. The vapor dissipates outside the cleaning tank.

When the cooling capacity of the condensing coil 5 is increased in order to keep the temperature near the upper central part of the washing tank below the dew point, the condensing coil 5
The temperature in the vicinity of falls below the dew point of water vapor, and the water vapor in the air condenses and drops and mixes into the cleaning liquid. As a result, the quality of the cleaning liquid deteriorates, causing stains, rust and the like of the product.

The present invention has been made in order to solve these problems, and an object of the present invention is to be able to uniformly cool the atmosphere above the cleaning tank, to control that the cleaning liquid diffuses outside the cleaning tank, and An object of the present invention is to provide a push-pull type cooling / condensing / recovering apparatus which can efficiently recover a high-purity organic solvent.

(Means for Solving the Problems) The present invention has the following configuration in order to achieve the above object.

That is, in a push-pull type cooling / condensing / recovering device attached to a cleaning device using a volatile organic solvent, the push-pull type cooling / condensing / recovering device pushes the organic solvent into the opening of the tank opposite to one end and the other end of the tank. A push hood that sends out an air current by a pull and a pull hood that sucks the air flow are provided, and a condensation coil for cooling the passing air flow and condensing and collecting the organic solvent is installed in the push hood and the pull hood; And the push hood communicate with each other by a duct to form a circulation path for air returning the air sucked by the pull hood to the push hood, and within the circulation path, recovering the organic solvent flowing into the pull hood. A device is provided, sends air to the push hood in the middle of the duct, and sucks air from the pull hood Characterized in that a blowing means for forming a circulating flow of air in the circulation path Te.

(Operation) By sending air from the push hood by the blowing means and sucking air by the pull hood, a push-pull flow is formed between the push hood and the pull hood. The airflow forming the push-pull flow is cooled by the condensing coil when passing through the push hood and the pull hood, and forms a push-pull flow cooled to a predetermined temperature. The push-pull flow shields the upper part of the tank storing the organic solvent and prevents the organic solvent from escaping from the tank to the outside. The solvent vapor in the airflow sucked into the pull hood is collected by the collecting device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the structure of a push-pull type cooling / condensing / recovering apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a hot tub, and 12 denotes a steam tank, each of which stores an organic solvent cleaning liquid. Reference numeral 14 denotes a push hood provided on the upper surface of one of the walls of the cleaning tank including the hot tub 10 and the steam tank 12, and reference numeral 16 denotes a pull hood provided on the inner wall surface of the cleaning tank facing the push hood 14.

Reference numeral 30 denotes a condensation coil installed on the front side of each of the push hood 14 and the pull hood 16. The condensing coils 30 are arranged in multiple stages in the traveling direction of the airflow in the push hood 14 and the pull hood 16, and are configured so that the airflow is effectively cooled when the airflow passes through the condensing coils 30.

The bottom surfaces of the push hood 14 and the pull hood 16 are formed in a gutter shape, and the organic solvent condensed by the condensing coil 30 and dropped into the push hood 14 and the pull hood 16 is collected at the gutter-shaped bottom surface and returned to the cleaning tank.

Reference numeral 34 denotes a resistance plate provided in the push hood 14 and the pull hood 16. The resistance plate 34 is for giving a gradient to the flow rates of the blow-out and the suction so that the flow speed of the push hood 14 and the pull hood 16 is higher at the upper side than at the lower side.

The bottom of the pull hood 16 is connected via a duct 18 to the pull hood 16
Is connected to the adsorption tank 23 that stores activated carbon and the like disposed below the tank. The adsorption tank 23 is for completely adsorbing and recovering the organic solvent vapor that has not been cooled and condensed by the condensing coil 30 in the pull hood 16.

The adsorption tank 23 is used as a recovery device for the organic solvent.In place of the adsorption tank 23 containing activated carbon, a recovery device for cooling the solvent vapor recovered by the pull hood 16 and recovering the solvent may be installed. Good.

A duct 24 is connected to a side surface near the lower portion of the adsorption tank 23, and is connected to a duct 27 that is exhausted to the outside via a fan 26 installed as a blower in the middle of the duct 24.

Reference numeral 28 denotes a duct having one end communicating with the bottom of the push hood 14 and the other end connected to the exhaust duct 27. A flow rate adjusting damper 32 is provided inside the branch between the duct 28 and the exhaust duct 27.

Next, the operation of the push-pull type cooling / condensing and collecting apparatus of this embodiment will be described.

From the push food 14 to the pull food 16,
An airflow constantly flowing at a predetermined speed is formed, and the air containing the organic solvent at the top of the cleaning tank is sucked into the pull hood 16. In this embodiment, the resistance plate 34 forms an airflow having a flow velocity gradient as shown in the figure.

The vapor sucked into the pull hood 16 is cooled by the condensing coil 30, drops on the bottom of the pull hood 16 and is collected in the washing tank, and the vapor passing through the condensing coil 30 is adsorbed and collected in the adsorption tank 23.

The air that has passed through the adsorption tank 23 is transported to the exhaust side by the fan 26, a part of the air is exhausted to the outside by the flow adjustment damper 32, and the rest is blown out of the push hood 14 again into the cleaning tank. Even when air is blown out of the push hood 14, the air is also cooled by the condensation coil 30, and the cooling air flows out toward the pull hood 16. Thus, the air cooled by the condensation coil 30 of the push hood 14 and the pull hood 16 is circulated as a whole.

Since the air flow sent out by the fan 26 is branched by the flow rate adjusting damper 32, the flow rate sucked by the pull hood 16 is larger than the flow rate blown out from the push hood 14. This allows pull food
On the 16 side, a small amount of air is sucked from the outside of the cleaning tank.

The push-pull type cooling / condensing and recovering apparatus of this embodiment forms a push-pull flow in the upper part of the washing tank as described above, thereby shielding the upper part of the washing tank with the airflow, and evaporating the solvent vapor from the washing tank. Is prevented from escaping to the outside. In particular, in this embodiment, the push hood
By installing the condensation coil 30 in the pull hood 14 and the pull hood 16, the push-pull flow can be cooled appropriately, and the upper part of the washing tank through which the push-pull flow circulates can be uniformly cooled, and the solvent vapor The divergence is effectively prevented. Thereby, the problem that the vicinity of the upper central portion of the cleaning tank could not be completely shielded due to the low thermal conductivity of air in the related art can be solved, and an effective shielding action can be achieved.

(Effect of the Invention) According to the present invention, as described above, a push-pull airflow is provided above a tank for storing a volatile substance such as an organic solvent, and in particular, a push-pull flow provided by cooling air is provided. A remarkable effect such as

By the push-pull flow by the cooling air, an effective shielding effect can be obtained, and the emission of volatile substances can be effectively prevented.

It is possible to obtain a shielding effect without excessively cooling the air flow by push-pull, which saves energy and also prevents airborne moisture from being mixed into the organic solvent by not cooling excessively, Volatile substances such as organic solvents having a high concentration can be recovered.

By exhausting the purified air after recovering the vapor of a volatile substance such as an organic solvent, the generation of pollution can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of an embodiment of a push-pull type cooling / condensing and collecting apparatus according to the present invention, and FIG. 2 is an explanatory view showing a conventional configuration of a cleaning tank using a volatile substance. 10 …… hot tub, 12 …… steam bath, 14 …… push food,
16 ... pull hood, 18 ... duct, 23 ... adsorption tank, 26 ...
... Fan, 30 ... Condensing coil, 32 ... Flow adjustment damper,
34 ... Resistance body.

Claims (1)

(57) [Claims] 1. A push-pull type cooling / condensing / recovering device attached to a cleaning device using a volatile organic solvent, wherein an upper opening of the tank is provided opposite one end and the other end of a tank for storing the organic solvent. A push hood that sends out an air flow by push-pull and a pull hood that sucks the air flow are provided in the section, and a condensation coil for cooling the passing air flow and condensing and collecting the organic solvent is installed in the push hood and the pull hood. Forming a circulation path for air that returns the air sucked by the pull hood to the push hood by communicating the pull hood and the push hood with a duct, and in the circulation path, the organic solvent that has flowed into the pull hood is formed. Providing a collecting device for collecting, sending air to the push hood in the middle of the duct, and removing air from the pull hood Push-pull cooling condenser suction to be characterized in that a blowing means for forming a circulating flow of air in the circulation path.