JP2015020096A - Liquid gas injection device and liquid gas cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid gas injection device which stably injects a liquid gas while preventing the occurence of dew condensation.SOLUTION: A liquid gas injection device includes: a supply pipe 21 which supplies a liquid gas LN; a rotation nozzle head 22 which is attached to a tip of the supply pipe 21, is rotationally and integrally driven with the supply pipe 21, and is provided with multiple nozzles 27 for injecting the liquid gas LN; a power transmission mechanism 24 which transmits power for rotating the rotation nozzle head 22 to the supply pipe 21; a casing 25 which houses the power transmission mechanism 24 therein; and a heater 26 which prevents dew condensation occurring in the power transmission mechanism 24 and/or the casing 25.

Description

  The present invention relates to a liquefied gas injection device and a liquefied gas cleaning device.

  For example, there has been proposed a method for cleaning an object to be cleaned by injecting a low-temperature and high-pressure liquefied gas such as liquefied nitrogen gas (liquid nitrogen) or liquefied carbon dioxide gas (liquefied carbon dioxide) onto the object (for example, , See Patent Literatures 1 and 2).

  In this method, it is possible to remove deposits such as dirt adhering to the surface of the object to be cleaned without damaging the surface of the object to be cleaned. Further, since the liquefied gas is vaporized after the injection, it does not remain on the surface of the object to be cleaned after the treatment.

US Pat. No. 7,310,955 US Patent Application Publication No. 2012/0031994

  By the way, in the liquefied gas injection apparatus which injects the liquefied gas mentioned above, liquefied gas is injected from the several nozzle provided in this rotating nozzle head, rotating a rotating nozzle head. For this reason, the conventional liquefied gas injection apparatus has a configuration in which a drive motor for rotating the rotary nozzle head, a gear box for transmitting the power of the drive motor to the rotary nozzle head, and the like are provided. .

  However, in the conventional liquefied gas injection device, when such a gear box is cooled by the liquefied gas, moisture in the air may adhere and condensation may occur. In particular, when dew condensation occurs on the gears in the gear box, the gears are fixed due to freezing, resulting in failure of the gear box, the drive motor, and the like.

  The present invention has been proposed in view of such conventional circumstances, and a liquefied gas injection apparatus capable of stably injecting liquefied gas while preventing the occurrence of condensation, and such liquefaction. An object of the present invention is to provide a liquefied gas cleaning device that can stably clean an object to be cleaned using a gas injection device.

The present invention provides the following means.
(1) a supply pipe for supplying liquefied gas;
A rotating nozzle head that is attached to the tip of the supply pipe, is driven to rotate integrally with the supply pipe, and is provided with a plurality of nozzles that eject the liquefied gas;
A power transmission mechanism for transmitting power for rotating the rotary nozzle head to the supply pipe;
A casing that houses the power transmission mechanism therein;
A liquefied gas injection device comprising: a heater for preventing condensation generated in the power transmission mechanism and / or the casing.
(2) The liquefied gas injection device according to (1), wherein the heater is attached to the casing.
(3) The liquefied gas injection device according to (1), wherein the heater is disposed outside the casing.
(4) The liquefied gas injection device according to (1), wherein the heater is disposed inside the casing.
(5) The liquefied gas injection device according to (1), wherein the inside of the casing is set to a positive pressure by supplying dry air or nitrogen gas heated by the heater to the inside of the casing. .
(6) The liquefied gas injection device according to any one of (1) to (5), wherein the liquefied gas is liquid nitrogen.
(7) A liquefied gas cleaning device that cleans an object to be cleaned by injecting liquefied gas onto the object to be cleaned,
A liquefied gas cleaning apparatus comprising the liquefied gas injection device according to any one of (1) to (6).

  As described above, according to the present invention, a liquefied gas injection device capable of stably injecting liquefied gas while preventing the occurrence of dew condensation, and a liquefied gas injection device using such a liquefied gas injection device. It is possible to provide a liquefied gas cleaning apparatus capable of stably cleaning an object.

It is a block diagram which shows schematic structure of a liquefied gas cleaning apparatus. It is a cross-sectional schematic diagram which shows one structural example of a liquefied gas injection apparatus. It is a cross-sectional schematic diagram which shows another structural example of a liquefied gas injection apparatus. It is a cross-sectional schematic diagram which shows another structural example of a liquefied gas injection apparatus. It is a cross-sectional schematic diagram which shows another structural example of a liquefied gas injection apparatus.

Hereinafter, a liquefied gas injection device and a liquefied gas cleaning device to which the present invention is applied will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make the features easy to understand, there are cases in which the portions that become the features are schematically shown for convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

(Liquefied gas cleaning device)
First, a liquefied gas cleaning apparatus 1 shown in FIG. 1 will be described as an embodiment of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of the liquefied gas cleaning apparatus 1.

  As shown in FIG. 1, the liquefied gas cleaning device 1 includes a liquefied gas injection device 2, a heat exchanger 3, a booster 4, and a storage tank 5.

The liquefied gas injection device 2 injects liquid nitrogen LN ₂ as liquefied gas. The heat exchanger 3 lowers the temperature of the liquid nitrogen LN ₂ supplied to the liquefied gas injection device 2 and is connected to the liquefied gas injection device 2 via the hose 6. The booster 4 boosts the liquid nitrogen LN ₂ supplied to the heat exchanger 3, and is connected to the heat exchanger 3 via a pipe 7. The storage tank 5 stores liquid nitrogen LN ₂ and is connected to the booster 4 through a pipe 8.

In the liquefied gas cleaning apparatus 1 having the above-described configuration, the cleaning object S can be cleaned by injecting liquid nitrogen LN ₂ onto the cleaning object S. Specifically, in this liquefied gas cleaning device 1, liquid nitrogen LN ₂ is supplied from the storage tank 5 by operating the liquefied gas injection device 2. The liquid nitrogen LN ₂ is supplied to the liquefied gas injection device 2 in a low temperature and high pressure state by being boosted by the booster 4 and then being lowered in temperature by the heat exchanger 3. The liquefied gas injection device 2 injects low-temperature and high-pressure liquid nitrogen LN ₂ onto the object S to be cleaned.

As a result, it is possible to remove contaminants such as dirt adhering to the surface of the cleaning object S without damaging the surface of the cleaning object S. Further, since the liquid nitrogen LN ₂ is vaporized after jetting, the liquid nitrogen LN ₂ does not remain on the surface of the cleaning object S after the processing.

(Liquefied gas injection device)
Next, the configuration of the liquefied gas injection device 2 will be described with reference to FIG.
FIG. 2 is a schematic cross-sectional view showing a configuration example of the liquefied gas injection device 2.

  As illustrated in FIG. 2, the liquefied gas injection device 2 includes a supply pipe 21, a rotary nozzle head 22, a drive motor 23, a power transmission mechanism 24, a casing 25, and a heater 26.

The supply pipe 21 supplies liquid nitrogen LN ₂ to the rotary nozzle head 22, and both ends of the supply pipe 21 are rotatably supported while passing through the casing 25.

The rotary nozzle head 22 is attached to the tip of the supply pipe 21 and is driven to rotate integrally with the supply pipe 21. A plurality of nozzles 27 for injecting liquid nitrogen LN ₂ are provided on the front surface of the rotary nozzle head 22. Thereby, it is possible to eject liquid nitrogen LN ₂ from the plurality of nozzles 27 while rotating the rotary nozzle head 22.

  The drive motor 23 is attached to the proximal end side of the shaft 28 and rotationally drives the shaft 28. The shaft 28 is rotatably supported with the base end side penetrating the casing 25.

  The power transmission mechanism 24 transmits power for rotating the rotary nozzle head 22 from the drive motor 23 to the supply pipe 21. Specifically, a drive gear 29 is attached to the shaft 28. The drive gear 29 is rotationally driven integrally with the shaft 28 inside the casing 25. On the other hand, a driven gear 30 is attached to the supply pipe 21. The driven gear 30 is rotationally driven integrally with the supply pipe 21 inside the casing 25. The drive gear 29 and the driven gear 30 are meshed with each other. As a result, power for rotating the rotary nozzle head 22 can be transmitted.

  The casing 25 accommodates the power transmission mechanism 24 therein. A drain 31 is provided below the casing 25. In addition, a temperature sensor 32 for measuring the temperature of the casing 25 is attached to the casing 25.

  The temperature sensor 32 is electrically connected to a power supply device 36 that drives the heater 26 via a wiring 33. Thereby, it is possible to control the driving of the heater 26 while measuring the temperature of the casing 25.

  The heater 26 prevents condensation that occurs in the power transmission mechanism 24 and / or the casing 25. Specifically, in the present embodiment, the heater 26 is attached to the casing 25. The heater 26 is electrically connected to the power supply device 36 via the wiring 34. Thereby, electric power can be supplied to the heater 26 during operation.

  In the liquefied gas injection device 2 having the above-described configuration, the heater 26 heats the power transmission mechanism 24 in the casing 25 together with the casing 25 during operation. Thereby, the dew condensation which generate | occur | produces in the power transmission mechanism 24 and the casing 25 can be prevented.

Therefore, according to the present invention, by using the liquefied gas injection device 2 capable of stably injecting the liquid nitrogen LN ₂ while preventing the occurrence of condensation, and such a liquefied gas injection device 2, It is possible to provide the liquefied gas cleaning apparatus 1 that can stably clean the cleaning object S.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
Specifically, the liquefied gas cleaning device 1 may be configured to include liquefied gas injection devices 2A, 2B, and 2C as shown in FIGS. 3 to 5 in place of the liquefied gas injection device 2, for example.

  3 to 5 are schematic cross-sectional views showing other configuration examples of the liquefied gas injection devices 2A, 2B, and 2C. In addition, in the liquefied gas injection devices 2A, 2B, and 2C shown in FIGS. 3 to 5, portions equivalent to those of the liquefied gas injection device 2 are not described, and the same reference numerals are given in the drawings.

  As shown in FIG. 3, the liquefied gas injection device 2 </ b> A has a configuration in which a heater 37 is disposed outside the casing 25. In the case of this configuration, the heater 37 heats the casing 25 from the outside during operation. Thereby, while the power transmission mechanism 24 in this casing 25 is heated with the casing 25, the dew condensation which generate | occur | produces in the power transmission mechanism 24 and the casing 25 can be prevented.

  As shown in FIG. 4, the liquefied gas injection device 2 </ b> B has a configuration in which the heater 38 is disposed inside the casing 25. In the case of this configuration, the heater 38 heats the casing 25 from the inside during operation. Thereby, while the power transmission mechanism 24 in this casing 25 is heated with the casing 25, the dew condensation which generate | occur | produces in the power transmission mechanism 24 and the casing 25 can be prevented. In particular, in the case of this configuration, it is possible to efficiently prevent condensation of the drive gear 29 and the driven gear 30 by heating the vicinity of the drive gear 29 and the driven gear 30 meshed with each other.

  As shown in FIG. 5, the liquefied gas injection device 2 </ b> C is configured to supply dry air or nitrogen gas G heated by the heater 39 into the casing 25 through the pipe 40. In the case of this configuration, it is possible to prevent condensation that occurs in the power transmission mechanism 24 and the casing 25 while heating the power transmission mechanism 24 in the casing 25 together with the casing 25. Further, by supplying dry air or nitrogen gas G heated by the heater 35 to the inside of the casing 25, the inside of the casing 25 can be kept at a positive pressure. Thereby, it is possible to prevent air containing moisture from entering the casing 25.

  Moreover, in this invention, it is not limited to each structure of the liquefied gas injection apparatus 2, 2A, 2B, 2C mentioned above, It is also possible to use combining any 2 or more structures among these structures. It is.

In the above-described embodiment, liquid nitrogen LN ₂ is used as the liquefied gas, but other than that, it is also possible to use a liquefied gas such as liquefied carbon dioxide gas.

DESCRIPTION OF SYMBOLS 1 ... Liquefied gas cleaning apparatus 2 ... Liquefied gas injection apparatus 3 ... Heat exchanger 4 ... Booster device 5 ... Storage tank 21 ... Supply pipe 22 ... Rotating nozzle head 23 ... Drive motor 24 ... Power transmission mechanism 25 ... Casing 26 ... Heater 27 ... Nozzle 37 ... Heater 38 ... Heater 39 ... Heater LN ₂ ... Liquid nitrogen (liquefied gas) S ... Object to be cleaned

Claims (7)

A supply pipe for supplying liquefied gas;
A rotating nozzle head that is attached to the tip of the supply pipe, is driven to rotate integrally with the supply pipe, and is provided with a plurality of nozzles that eject the liquefied gas;
A power transmission mechanism for transmitting power for rotating the rotary nozzle head to the supply pipe;
A casing that houses the power transmission mechanism therein;
A liquefied gas injection device comprising: a heater for preventing condensation generated in the power transmission mechanism and / or the casing.   The liquefied gas injection device according to claim 1, wherein the heater is attached to the casing.   The liquefied gas injection device according to claim 1, wherein the heater is disposed outside the casing.   The liquefied gas injection device according to claim 1, wherein the heater is disposed inside the casing.   2. The liquefied gas injection device according to claim 1, wherein the inside of the casing is set to a positive pressure by supplying dry air or nitrogen gas heated by the heater into the casing.   The liquefied gas injection apparatus according to claim 1, wherein the liquefied gas is liquid nitrogen. A liquefied gas cleaning device for cleaning the object by injecting liquefied gas onto the object to be cleaned,
A liquefied gas cleaning apparatus comprising the liquefied gas injection device according to any one of claims 1 to 6.

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