JP2003083254A - Package type air compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve compression efficiency in a package type air compressor and suppress temperature rise of each operating section. SOLUTION: In the package type air compressor, a casing 3 provided with a suction port 1 and a discharge port 2 comprises inside a compressor 5, its driving electric motor 6 and a compressed air tank 4 for storing a compressed air discharged from the compressor 5, and a cooling fan 15, and a cooling element 10 disposed close to the suction port 1 for feeding air into the casing 3. A condensed water 19 accumulated in a bottom of the compressed air tank 4 is introduced to the cooling element 10 through a conduit 16, and is diffused from a leading end of the conduit 16 to the cooling element 10 by using a compressed air accumulated in the compressed air tank 4, whereby the air flowing in the case from the suction port 1 is cooled by using heat of evaporation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, its driving prime mover, and generated compressed air inside a substantially hermetically sealed casing for noise prevention and safety assurance. The present invention relates to a package-type air compressor that accommodates a compressed air tank or the like that stores the

[0002]

2. Description of the Related Art In a package type air compressor as described above, the temperature inside the housing rises as the operating time elapses, the compression efficiency decreases, and the durability and life of each operating part are adversely affected.

Therefore, it is necessary to prevent the temperature in the housing from exceeding a certain level, especially when the atmospheric temperature is high, such as in the summer, and conventionally, a cooling fan is used to forcibly blow the air into the housing. I was doing.

Further, in the conventional apparatus, when the amount of condensed water generated from the air compressed by the compressor exceeds a certain amount, the condensed water is discharged out of the housing as it is.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the condensed water generated from the air compressed by the compressor is used to discharge the intake air to various parts in the housing, particularly the compressor, the electric motor, the compressed air tank, and the compressor. By cooling also, the compression efficiency is improved especially when the outside air temperature is high, and the temperature rise of each operating portion is suppressed to improve its durability and life.

[0006]

In order to achieve the above object, the package type air compressor of the present invention is characterized by adopting the following configuration. (1) Inside the casing that has an intake port and an exhaust port, a compressor,
A package type in which a driving electric motor and a compressed air tank for storing compressed air discharged from the compressor are housed, and a cooling fan and a cooling element for supplying air into the housing are provided in the vicinity of the intake port. In the air compressor, the condensed water accumulated at the bottom of the compressed air tank is guided to the vicinity of the cooling element by a conduit, and the pressure of the compressed air accumulated in the compressed air tank is used to make the cooling element from the tip of the conduit. By being dispersed inside, the heat of vaporization is used to cool the atmosphere flowing in through the intake port.

(2) In the above item (1), a condensed water level detection sensor and an electric normally-closed valve are provided at appropriate places of the compressed air tank and the conduit, respectively, so that the water level of the condensed water accumulated in the compressed air tank is constant. When the above is reached, the condensed water surface detection sensor detects that fact and opens the electric normally-closed on-off valve.

(3) In the above item (2), the electric normally-closed valve is opened only when the detection accuracy of the atmospheric temperature detection sensor provided in a proper place exceeds a certain value.

(4) In the above item (1), a condensed water level detection sensor and an electric on-off valve are provided at appropriate places of the compressed air tank and the conduit, respectively, so that the water level of the condensed water accumulated in the compressed air tank is above a certain level. Then, the condensed water surface detection sensor detects that fact and opens the electric on-off valve, and when the water level of the condensed water falls below a certain level, the condensed water surface detection sensor detects that fact and closes the electric on-off valve. I will let you.

(5) In the above item (4), the electric on-off valve is opened only when the temperature detected by the atmospheric temperature detecting sensor provided in a proper place exceeds a certain value.

(6) In any one of the above items (1) to (5), the temperature of the condensed water in the conduit is lowered by applying the atmosphere sent by the cooling fan into the housing to the conduit.

(7) In the above item (6), a cooling fin is provided in the conduit at a portion exposed to the atmosphere sent by the cooling fan.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view schematically showing an embodiment of the present invention. A compressed air tank (4) and a compressor (5) are provided from the bottom to the rear of the housing (3) having an intake port (1) at a proper position on the front surface and an exhaust port (2) near the rear end of the upper surface. ), And an electric motor (6) for driving the compressor are provided in a stacked state.

A condensed water surface detection sensor (7) is attached to the compressed air tank (4), and the lower end of the detection rod (8) is located slightly above the bottom surface of the compressed air tank (4). A suction port (9) is provided on the front surface of the compressor (5).

On the rear side of the intake port (1) in the housing (3),
A cooling element (10) covering the entire surface is provided.
The illustrated cooling element (10) is of a water sprinkling type that uses heat of vaporization, the top surface (11) of which is open and the bottom wall (12) is
The condensate drain pipe (13) is connected.

Immediately after the cooling element (10), there is provided a cooling fan (15) which is appropriately driven around the front-rear shaft (14) by an electric motor (not shown).

At the bottom of the compressed air tank (4) is a conduit (16).
The rear end is open, the conduit (16) rises behind the cooling fan (15) and then goes forward, and the downward sprinkler (17) provided at the front end of the conduit (16) opens the cooling element (10). It is located directly above the upper surface (11).

A solenoid valve as an electric on-off valve is provided at a proper place below the rising portion of the conduit (16) behind the cooling fan (15).
(18) is provided. At the portion above the solenoid valve (18) that contacts the cooling air from the cooling fan (15), the conduit
Optional cooling fins (22) are provided in (16).

The solenoid valve (18) is opened and closed by an electric signal, and is electrically connected to the condensed water surface detection sensor (7), and the detection sensor (7) condenses in the compressed air tank (4). When it detects that the water level of the water (19) has exceeded a certain level,
When the solenoid valve (18) is opened and the water level falls below a certain level, the solenoid valve (1
8) is designed to be closed.

The solenoid valve (18) is a normally open type on-off valve that is closed when the water level of the condensed water (19) is below a certain level, or as a normally closed type on-off valve, the condensed water (19) is closed. It may be implemented so that it opens when the water surface reaches a certain level.

Atmosphere thermometers (21) are provided at appropriate places on the top wall (20) of the casing (3) and at other appropriate places.
1) is electrically connected to the solenoid valve (18), and when the atmosphere exceeds a certain temperature, the condensed water surface detection sensor
The solenoid valve (18) is designed to be opened only when a signal is received from (7).

Thus, according to the above embodiment, the solenoid valve (18) opens when the water level of the condensed water (19) in the compressed air tank (4) exceeds a certain level in the case where the atmosphere has a constant temperature. The condensed water (19) is sent through the conduit (16) by the pressure in the compressed air tank (4) and is sprayed from the water discharge port (17) at the front end of the condensed water (4) toward the cooling element (10).

Therefore, the cooling fan (15) is used for the intake port.
The atmosphere sucked from (1) and passing through the cooling element (10) is cooled by vaporization of the condensed water (19) to be sprayed, and then flows into the housing (3).

Therefore, the temperature in the housing (3) becomes lower than that in the atmosphere, and the compressed air tank (4), the compressor (5) and the electric motor.
The temperature of (6) is deprived, air having a temperature lower than that of the atmosphere is sucked from the suction port (9) of the compressor (5), and the compressed air tank (4) is also cooled. In addition to improving efficiency, overheating of each operating part is prevented and its durability is also improved.

The condensed water (19) discharged from the sprinkling port (17) and descending in the cooling element (10) is discharged through the discharge pipe (13) and appropriately treated.

Although not shown, a compressed air tank
In the lower part of (4), a discharging means capable of discharging condensed water may be provided as needed.

[0027]

The main effects of the invention described in each claim are listed below. The invention according to claim 1: -The condensed water accumulated in the compressed air tank is sprayed from the front end thereof into the cooling element through the conduit by the pressure in the tank, and the inflowing air into the housing is caused by the heat of vaporization thereof. To be cooled.

Therefore, since the temperature of the intake air to the compressor is lowered, the compression efficiency is improved, the overheating of the electric motor is prevented, and the compressed air tank is cooled, so that the condensed water is separated from the compressed air well. , The amount of generation also increases.

Further, since the condensed water accumulated in the compressed air tank can be discharged through the conduit at any time, it is not necessary to provide a separate means for discharging the condensed water in the compressed air tank.

According to the second aspect of the invention, the condensed air in the compressed air tank is wasted because the condensed water is automatically sent only when the amount of condensed water accumulated in the compressed air tank exceeds a certain amount. Will not be released to.

According to the third aspect of the present invention, the condensed water is sent to the cooling element only when the amount of the condensed water accumulated in the compressed air tank becomes a certain amount or more and the atmospheric temperature is higher than the certain amount. Therefore, even when the atmospheric temperature is low,
Condensed water is never sent unnecessarily to the cooling element.

According to a fourth aspect of the present invention, the supply and stop of the condensed water in the compressed air tank to the cooling element are automatically performed according to the water level.

Invention of Claim 5: -The same effect as that of the invention of Claim 3 is exhibited.

The invention according to claim 6 is: -The temperature of the condensed water sprinkled on the cooling element is lowered, so that the effect of cooling the intake air is large.

Invention of Claim 7: -The effect of the preceding item is further promoted.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention.

[Explanation of symbols]

(1) Intake port (2) Exhaust port (3) Case (4) Compressed air tank (5) Compressor (6) Electric motor (7) Condensed water level detection sensor (8) Detection rod (9) Suction port (10) Cooling element (11) Top surface (12) Bottom wall (13) Discharge pipe (14) Front-rear axis (15) Cooling fan (16) Conduit (17) Water spout (18) Solenoid valve (19) Condensed water (20) Top wall (21) Atmospheric thermometer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Fumihiro Murano             3176 Shinyoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa             Anest Iwata Co., Ltd. F-term (reference) 3H003 AC02 BE06 BG04 CD06                 3H076 AA35 BB06 CC07 CC94 CC99

Claims (7)

[Claims] 1. Inside a housing having an intake port and an exhaust port,
A compressor, an electric motor for driving the same, and a compressed air tank for storing compressed air discharged from the compressor are housed, and a cooling fan and a cooling element for supplying air into the housing are provided in the vicinity of the intake port. In the package type air compressor, the condensed water accumulated at the bottom of the compressed air tank is guided to the vicinity of the cooling element by the conduit, and the pressure of the compressed air accumulated in the compressed air tank is used to make the tip of the conduit. The air-cooling device is characterized in that the heat of vaporization is used to cool the atmosphere flowing in through the intake port by spraying the air from the above into the cooling element. 2. A condensed water level detection sensor and an electric normally closed on-off valve are provided at appropriate places of the compressed air tank and the conduit respectively, and when the water level of the condensed water accumulated in the compressed air tank exceeds a certain level, the condensed water level is increased. The package type air compressor according to claim 1, wherein the detection sensor detects that fact and opens the electric normally-closed valve. 3. The package according to claim 2, wherein the electric normally-closed valve is opened only when the detection accuracy of an atmospheric temperature detection sensor provided in a proper place exceeds a certain value. Type air compressor. 4. A condensed water level detection sensor and an electric on-off valve are provided at appropriate places of the compressed air tank and the conduit, respectively.
When the water level of condensed water accumulated in the compressed air tank exceeds a certain level, the condensed water level detection sensor detects that fact and opens the electric on-off valve, and when the water level of the condensed water falls below a certain level, the condensed water level is detected. The sensor detects that fact and closes the electric on-off valve.
The packaged air compressor described. 5. The package type air compressor according to claim 4, wherein the electric on-off valve is opened only when the temperature detected by an atmospheric temperature detection sensor provided in a proper place exceeds a certain value. Machine. 6. The package mold according to claim 1, wherein the temperature of the condensed water in the conduit is lowered by applying the atmosphere sent to the inside of the housing by a cooling fan to the conduit. air compressor. 7. The package type air compressor according to claim 6, wherein a cooling fin is provided in the conduit at a portion exposed to the atmosphere sent by the cooling fan.