JP2012163261A - Air conditioner cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner cleaning method that does not require troublesome aftertreatment of dry ice powder and compressed air as a cleaning medium, and that facilitates carrying out aftertreatment of separated contaminants.SOLUTION: The dry ice powder P comes into contact with and impacts on surfaces of air conditioning function parts such as a fin 101a of an indoor heat exchanger 101, a blade 105a of a cross flow fan 105, and a louver 106, and an inner wall surface 104a of a communicating passage 104 or the like, and thereby the contaminants C are separated from contaminated parts of these surfaces. The contaminants C separated from the contaminated parts are guided to a temporary filter 152 installed on a discharge port 151 along a flow of the compressed air (and the dry ice powder P) and are captured. The compressed air is exhausted to an external by passing through the temporary filter 152.

Description

  The present invention relates to a cleaning method for cleaning the inside of an air conditioner such as an air conditioner, an air cleaner, an electrostatic precipitator, or a mist collector. Specifically, the air-conditioning equipment is provided with a communication passage that circulates air from the inlet to the outlet and is air-conditioned by the air-conditioning function portion provided in the communication passage. The present invention relates to a method for cleaning an air conditioner that removes existing dirt substances.

  Various cleaning methods for cleaning the inside of an air conditioner that is an air conditioner have been proposed. For example, in the cleaning methods shown in Patent Documents 1 and 2, the cleaning portion or the entire air conditioner is covered with a cover or the like, and the cleaning liquid is sprayed into the air conditioner, and the removed dirt substance and cleaning liquid are received as dirty water by the cover or the like.

Japanese Patent No. 2800800 Japanese Patent No. 3325259

  The air-conditioner cleaning methods described in these patent documents have an advantage that the interior can be cleaned with the air-conditioner installed. However, since the cleaning liquid is sprayed inside the air conditioner, it is necessary to cover the entire air conditioner with a cover, etc. so that the removed dirt substance and cleaning liquid do not scatter outside the air conditioner. The post-treatment of the sewage collected in (1) is a complicated process. In some cases, a solvent such as a solvent for removing dirt or water cannot be used as a cleaning medium (for example, when the air conditioner is an electric dust collector).

  An object of the present invention is to provide an air-conditioning equipment cleaning method that does not require troublesome post-processing for dry ice powder and compressed air, which are cleaning media, and that allows easy post-processing of separated soil substances.

Means for Solving the Problems and Effects of the Invention

In order to solve the above-mentioned problem, the present invention includes a communication passage that circulates air from a suction port to a blowout port, and the air-conditioning function portion of the air-conditioning apparatus that performs air conditioning by the air-conditioning function portion provided in the communication passage, A method of cleaning an air conditioner that removes a dirt substance present in at least one dirt spot of a communication path,
One of the suction port and the blower port is a supply port for cleaning, and the other is a discharge port, and the discharge port is provided with a temporary filter that has air permeability and prevents the passage of dirt substances. To cover temporarily,
By spraying dry ice powder together with compressed air from the supply port toward the discharge port, the dirt substance is separated from the dirt spot by contact or impact of the dry ice powder, and the separated dirt substance is at least compressed air. When there is dry ice powder that is not sublimated, it is captured by the temporary filter along with the dry ice powder when it is guided to the temporary filter installed at the discharge port on the flow of At least compressed air passes through the temporary filter and is discharged outside.
After stopping the spraying of the dry ice powder and the compressed air, the dirt substance is removed from the air conditioner by removing the temporary filter that has caught the dirt substance from the outlet.

  In the above air-conditioning equipment cleaning method, a temporary filter is installed to temporarily block the inlet or outlet, and dry ice powder is sprayed with compressed air to separate the dirt substance from the dirt spot. Capture with a temporary filter. Therefore, there is no need for cumbersome post-processing for dry ice powder or compressed air, which is a cleaning medium, and the post-processing is completed by removing the temporary filter that captures the contaminants from the air-conditioning equipment. And clean. Specifically, most dry ice powders sublimate into a gas (carbon dioxide) when separating dirt from the soiled part, pass through a temporary filter with compressed air, and are discharged to the outside. If there is no dry ice powder, it will be captured by the temporary filter along with the dirt material.

  Moreover, since the dry ice powder, which is a cleaning medium, is in a solid state when sprayed to a soiled area, it is easy to separate the soiled substance by impact energy, and can be released into the air as it is when sublimated into gas (carbon dioxide). . Therefore, dry ice powder can be used for air conditioning equipment that cannot use liquid as a cleaning medium, such as an electric dust collector, and is highly versatile as a cleaning medium.

In the present invention, the “air conditioner” includes at least an air conditioner, an air cleaner, an electric dust collector, and a mist collector.
・ The air conditioner is equipped with a communication passage that circulates air in the room, factory, etc. from the inlet to the outlet, and air conditioning such as heat exchanger fins provided in the communication passage is used for air conditioning such as temperature and humidity. Do.
・ The air purifier is equipped with a communication passage that circulates air in the room, factory, etc. from the inlet to the outlet, and the communication passage is provided with air-conditioning functions such as a dust collection filter and a fan fan blade. Cleans the air by removing fine particles such as dust, pollen, house dust and oil mist floating in the air, and removing odors from pets and indoor environments. Of course, an air purifier for adsorbing cigarette smoke is also included in the air conditioning equipment to which the cleaning method according to the present invention is applied.
-The electrostatic precipitator is provided with a communication passage that circulates air in the room, factory, etc. from the inlet to the outlet, and the communication passage includes a blade of an ionizer (charged portion) charged to a high voltage of the negative electrode, Air-conditioning function unit such as a collector plate (dust collector) with positive charge is provided, and dust and oil mist charged in the negative electrode are absorbed by the positive collector by corona discharge of the ionizer unit. And clean the air by collecting.
-The mist collector is equipped with a communication passage that circulates air contaminated in the factory from the inlet to the outlet, and the oil mist that floats in the contaminated air by various types of air conditioning functions provided in the passage. Remove fume, oil, etc. to clean the air. There are many types of operating systems for mist collectors (for example, oil mist collectors), such as centrifugal separation systems, filter systems, and electrostatic dust collection systems. The filter system may have the same structure as the above air cleaner, and the electric dust collection system may have the same structure as the above electric dust collector.

  Among them, “air conditioner” is a general term for an air conditioner, a cooler, a heater, and the like, regardless of whether it is a dedicated cooling unit, a combined cooling or heating unit, or a home or commercial one. The “air conditioner” includes an integrated type and a separate type. The integrated type, like a window type room air conditioner, is an integrated compressor, condenser and evaporator. On the other hand, the separate type has an outdoor unit integrated with a compressor and an outdoor heat exchanger (condenser for cooling and an evaporator for heating) and an indoor heat exchanger (an evaporator for cooling and a condenser for heating). Is connected to the indoor unit with a refrigerant pipe. The indoor unit installation form for the separate type may be any of a wall-mounted type, a ceiling-embedded type, a ceiling-suspended type, a floor-standing type, and the like. Of course, an air conditioner mounted on a vehicle (or a moving body) such as an air conditioner for an automobile, an air conditioner for an aircraft, and an air conditioner for a train is also included in the air conditioner to which the cleaning method according to the present invention is applied.

  In the case of an air conditioner, fins of a heat exchanger (condenser or evaporator) are arranged in the communication path, and the blades of a blower fan that sucks or sends air, a wind direction plate that adjusts the blowing direction of air, and the like Is also arranged and constitutes an air conditioning function unit. Therefore, the dirt substance adhering to the surface of these air-conditioning function parts, the inner wall surface of the communication path, etc. is separated by the contact or impact of dry ice powder.

In addition, the suction port and the discharge port that were the discharge port were changed to a new supply port for cleaning, and the one that was the supply port was changed to a new discharge port. In the same way as last time, temporarily cover with a temporary filter from the outside,
Dry ice powder and compressed air are sprayed from the new supply port to the new discharge port in the opposite direction to the previous passage, and the dirt substance is temporarily filtered with a temporary filter installed at the new discharge port. Captured as well,
After the spraying of dry ice powder and compressed air is stopped, the extraneous filter that captures the dirt substance is removed from the new outlet to remove the dirt substance from the air conditioner.

  As described above, the internal cleaning of the communication path is performed from both sides of the suction port side and the blower outlet side, so that even if the communication path is curved in the middle or the cross-sectional shape is changed, dry ice Since the powder spreads widely, the dirt substance is easily separated from the dirt spot, and the cleaning effect can be obtained in a short time. Especially in an air conditioner, unevenness in cleaning occurs by causing dry ice powder to collide with air conditioning function parts such as fins of heat exchangers, fan fan blades, and wind direction plates arranged in the middle of the communication path from both directions. It becomes difficult.

  The dry ice powder is produced by cutting a dry ice block and supplied to the injection unit, and the dry ice powder is injected together with the compressed air from the injection unit into the communication path.

  The dry ice powder, which is a cleaning medium, is not prepared in advance, but is scraped off when it is actually sprayed, so it can spray freshly made soft and soft dry ice powder, and its mass is small and collision energy is not excessive. In addition, it is possible to prevent damage to the surface of the air conditioning function unit, the inner wall surface of the communication path, and the like.

  Furthermore, when the spraying unit starts spraying dry ice powder and compressed air, cutting of the dry ice block is started, and when the spraying unit stops spraying dry ice powder and compressed air, the cutting of the dry ice block is stopped. Is done.

  Thus, by providing as much dry ice powder as necessary when necessary, it is possible to prevent waste such as generation of excessive dry ice powder and retention or sublimation before being used for cleaning.

  The dry ice powder produced by cutting is supplied to the injection unit via the powder hose, and the supply of dry ice powder is stopped while the supply of dry ice powder is stopped until the time limit has elapsed since the injection start of the injection unit. Then, at least dry ice powder remaining in the powder hose is discharged from the spraying section for cleaning, and after the time limit has elapsed, new dry ice powder is supplied to the powder hose and guided to the spraying section.

  Thereby, the inside of a powder hose etc. are cleaned at the time of the injection start of an injection part. For example, even when dry ice powder remains in the powder hose when the cleaning operation is temporarily suspended, the cleaning operation can be performed after the residual dry ice powder is cleaned at the start of injection of the injection unit. It is possible to prevent the ice mass (powder mass) having a large mass from colliding with the surface of the air-conditioning function unit, the inner wall surface of the communication path, etc., and damaging them.

  Alternatively, dry ice powder produced by cutting is supplied to the injection unit via a powder hose, and compressed air is supplied in a state where supply of dry ice powder is stopped until the time limit has elapsed since the injection stop of the injection unit. By continuing, at least the dry ice powder remaining in the powder hose is discharged from the spray unit and cleaned.

  Thereby, the inside of a powder hose etc. are cleaned at the time of injection stop of an injection part. For example, when the cleaning operation is temporarily suspended, dry ice powder that remains in the powder hose, etc., adheres to each other (freezes) and tends to form ice blocks (which may increase in size) is stopped by the spray unit. Since it is sometimes cleaned, it is possible to avoid clogging of the combined ice blocks in the hose and the injection section, and the combined large ice blocks (powder blocks) on the surface of the air-conditioning function section, the inner wall surface of the communication path, etc. You can prevent them from colliding and damaging them.

  Also, while the dry ice block is rotated forward by a motor, the cutting blade bites into the dry ice block for cutting, and the cutting blade does not bite into the dry ice block for cutting against the reverse rotation of the motor. Yes, when the injection unit starts the injection, the motor is once rotated in the reverse direction and then turned to the normal rotation to start cutting.

  Cutting of the dry ice block is stopped by stopping the injection of the injection unit, but when the injection of the injection unit is restarted, the dry ice block is restarted by the motor and cutting for obtaining dry ice powder is resumed from the middle. Will do. When the dry ice block is stopped in the middle of cutting, it is normal that the cutting blade bites into the dry ice block and a step is generated there. If the motor is restarted in this state, a large torque is required to start cutting from that stage, and an excessive load is likely to be applied to the motor, but once the motor is reversed, the cutting edge of the cutting blade is moved away from the stage. Cutting can be resumed without applying an excessive load to the motor by causing the motor to rotate forward and applying momentum to the cutting blade to cause the stage to collide.

  Furthermore, the particle size of the dry ice powder cut out from the dry ice block can be changed by changing the rotation speed of the motor.

  For example, if the components of the air-conditioning function section and the walls of the communication passage are thin and weak in strength, increasing the number of revolutions of the motor to reduce the particle size of the dry ice powder and reduce the powder mass will cause injection. -Impact energy at the time of collision is also reduced, and damage to the surface of the air conditioning function unit and the inner wall surface of the communication path can be avoided. On the other hand, when cleaning the dirt that is difficult to remove due to the high strength of the components of the air conditioning function section and the walls of the communication path, if the mass of the powder is increased by lowering the number of revolutions of the motor, This increases the energy and improves the cleaning power.

Schematic explanatory drawing which shows one Example of the air-conditioning equipment cleaning method which concerns on this invention. Explanatory drawing which shows the principal part of FIG. Explanatory drawing which shows the air-conditioning equipment washing | cleaning method following FIG. BRIEF DESCRIPTION OF THE DRAWINGS Whole schematic which shows simply an example of the blasting apparatus used for the air-conditioning equipment washing | cleaning of this invention. FIG. 5 is a control system diagram of FIG. 4. The perspective view which shows the vicinity of the cutting blade and hopper of FIG. Schematic explaining the action of the injection gun. The flowchart which shows the control program of the blasting apparatus of FIG. Schematic which shows the process of the cleaning of the dry ice powder in a powder hose. Schematic following FIG. Schematic following FIG. 10 of supplying new dry ice powder after cleaning. Process drawing where the dry ice block is reversed once and then turned forward to resume cutting. Explanatory drawing which shows the other Example of the air-conditioning equipment cleaning method which concerns on this invention. Explanatory drawing which shows the further another Example of the air-conditioning equipment cleaning method which concerns on this invention. Explanatory drawing which shows the further another Example of the air-conditioning equipment cleaning method which concerns on this invention. Explanatory drawing which shows the further another Example of the air-conditioning equipment cleaning method which concerns on this invention.

Example 1
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a schematic explanatory view showing an embodiment of an air conditioner cleaning method according to the present invention, and shows a case where the air conditioner is an air conditioner (air conditioner cleaning). The air conditioner AC shown in FIG. 1 is a separate type for cooling and heating, in which an indoor unit 100 and an outdoor unit 110 are connected by a refrigerant pipe 120. The indoor unit 100 includes an indoor heat exchanger 101 (an evaporator during cooling and a condenser during heating), and an outdoor unit 110 includes a compressor 111 and an outdoor heat exchanger 112 (a condenser during cooling and an evaporator during heating). Built in. Reference numeral 113 denotes a propeller fan as a blower fan provided in the outdoor unit 110.

  In the upper part of the indoor unit 100, a suction port 102 for introducing indoor air to be adjusted is opened forward. A blower outlet 103 for returning the adjusted air to the room opens at the lower part of the indoor unit 100 toward the front lower side. A communication path 104 through which air introduced from the suction port 102 is circulated to the blower outlet 103 is formed to be curved in order to change the direction from the lateral direction to the downward direction. Inside the communication path 104, fins 101a of the indoor heat exchanger 101 are arranged, and the blades 105a of the cross flow fan 105 as a blower fan for sending the adjusted air into the room and the air blowing direction are adjusted. A wind direction plate 106 and the like are also arranged, and these serve as an air conditioning function unit. Reference numeral 107 denotes an air conditioner filter for capturing dust when air is introduced from the suction port 102.

  The indoor unit 100 is a horizontally long (long in the direction orthogonal to the paper surface) wall-hanging type, and is also called a room air conditioner. The suction port 102 and the air outlet 103 that open to the indoor unit 100, the communication path 104, the cross flow fan 105 (blade 105a), the wind direction plate 106, and the air conditioner filter 107 that are arranged inside the indoor unit 100 are all horizontally long. Is formed. In the indoor heat exchanger 101, a large number of fins 101a positioned in parallel with the paper surface are arranged along a direction orthogonal to the paper surface. The indoor unit 100 introduces indoor air from the suction port 102, adjusts temperature, humidity, and the like and repeats the operation of returning the air from the blower outlet 103 to the room, so that the contaminant C is deposited on the inner wall surface 104 a of the communication path 104. Adhere (see FIG. 2). In particular, since the dirt substance C adheres a lot to the air conditioning function parts such as the fins 101a of the indoor heat exchanger 101, the blades 105a of the cross flow fan 105, the wind direction plate 106, etc., it is encouraged to periodically clean the inside. Yes. Thus, in this embodiment, the target for air conditioning cleaning is the indoor unit 100, and the indoor unit 100 is a substantial air conditioner.

  FIG. 2 is an explanatory view showing a main part of the air conditioning equipment cleaning method. As shown in FIG. 2, the air outlet 103 of the indoor unit 100 is used as a supply port 150 for cleaning, and the suction port 102 is used as a discharge port 151 for cleaning. The exhaust port 151 (suction port 102) is covered with a temporary filter 152 from the outside, and is temporarily closed during the air-conditioner cleaning. The temporary filter 152 has air permeability so as to prevent the passage of the dirt substance C adhering to the surface of the air-conditioning function unit, the inner wall surface 104a of the communication path 104, and the like. Consist of 1 mm to 0.5 mm mesh. Normally, the air conditioner filter 107 is detachable with respect to the indoor unit 100, and thus is removed and separately cleaned.

  The dry ice powder P formed into a granular shape by the blast device 1 (see FIG. 1) is sprayed from the supply port 150 toward the discharge port 151 together with the compressed air pressurized by the air compressor 9 (see FIG. 1). The dry ice powder P cuts the dry ice block B (see FIG. 4), and is supplied to the injection gun 7 as an injection unit through the powder hose 8, and the compressed air is supplied from the air compressor 9 through the air hose 10. The dry ice powder P and the compressed air are injected from the injection gun 7 toward the communication path 104.

  The dry ice powder P comes into contact with or impacts the surfaces of the air conditioning function parts such as the fins 101a of the indoor heat exchanger 101, the blades 105a of the cross flow fan 105, the wind direction plate 106, the inner wall surface 104a of the communication passage 104, and the like. As a result, the dirt substance C is separated from the dirt spots on these surfaces. The dirt substance C separated from the dirt spot is guided to the temporary filter 152 installed at the outlet 151 along the flow of compressed air (and dry ice powder P) and captured. Most dry ice powder P sublimates into a gas (carbon dioxide) when separating the dirt substance C from the dirt spot, passes through a temporary filter 152 together with compressed air, and is discharged to the outside. When the dry ice powder P that is not present is present, it is captured by the temporary filter 152 together with the dirt substance C. Further, the compressed air passes through a temporary filter 152 and is discharged to the outside.

  After the injection of the dry ice powder P and the compressed air is stopped by the operation of the spray gun 7, the temporary filter 152 that captures the dirt substance C is removed from the outlet 151 (suction inlet 102), thereby removing the dirt substance C from the air conditioner. Remove from.

  Next, FIG. 3 is explanatory drawing which shows the air-conditioning equipment washing | cleaning method following FIG. In FIG. 3, the suction port 102 and the blower port 103 that are the discharge ports in FIG. 2 are the new supply ports 150 ′ for cleaning, and the ones that are the supply ports are the new discharge ports 151 ′. Change to The new outlet 151 ′ is covered with a temporary filter 152 ′ from the outside in the same manner as in FIG. 2, and is temporarily closed during the air-conditioner cleaning subsequent to FIG. 2.

  The dry ice powder P and the compressed air are jetted in the direction opposite to that in FIG. 2 from the new supply port 150 ′ (suction port 102) toward the new discharge port 151 ′ (blower port 103). . Therefore, the contaminant C adhering to the surface of the air-conditioning function unit such as the fin 101a of the indoor heat exchanger 101, the blade 105a of the cross flow fan 105, the wind direction plate 106, and the inner wall surface 104a of the communication path 104 is In the same manner as in FIG. 2, the temporary filter 152 ′ installed at the new outlet 151 ′ is guided and captured. By stopping the spraying of the dry ice powder P and the compressed air by operating the spray gun 7, the temporary filter 152 ′ that captures the dirt substance C is removed from the new discharge port 151 ′ (blow-out port 103) to remove the dirt. Material C is removed from the air conditioner.

  As described above, the dry ice powder P or the compressed air that is a cleaning medium does not require a troublesome post-treatment such as collecting or detoxifying liquids such as sewage, and is a temporary filter that captures the dirt substance C. Since the post-processing is completed by removing (disposal) 152, 152 ′ from the air conditioner (indoor unit 100), the cleaning operation can be performed efficiently and cleanly.

  Furthermore, by performing internal cleaning of the communication path 104 from both the suction port 102 side and the air outlet 103 side, the dirt substance C can be easily separated from the contaminated portion even in the curved communication path 104, and the communication path 104 is shortened. The cleaning effect can be obtained with time. In particular, by causing the dry ice powder P to collide from both directions against the air conditioning function units such as the fins 101a of the indoor heat exchanger 101, the blades 105a of the cross flow fan 105, and the wind direction plate 106 arranged in the middle of the communication path 104, Uneven cleaning is less likely to occur.

  When the cleaning operation shown in FIG. 2 is X and the cleaning operation shown in FIG. 3 is Y, the cleaning operation is further increased by increasing the number of cleaning operations such as X → Y → X or X → Y → X → Y. The effect can be further enhanced. Also, since the cleaning operations X and Y can be expected to have a considerable cleaning effect even if they are performed independently, the present invention includes a cleaning method using only X or only Y.

  The blasting apparatus used in the air conditioning equipment cleaning method of the present invention including the air conditioning cleaning method described above will be described in more detail with reference to FIGS. The blasting device 1 shown in FIG. 4 includes a frame 3 that can be moved by wheels 2, a motor 20 that rotates the dry ice block B through the holder 4, and dry ice powder P obtained by cutting the dry ice block B. A hopper 6 to be accommodated, an injection gun 7 which is held by an operator and injects dry ice powder P together with compressed air, and the injection gun 7 and the hopper 6 are connected to guide the dry ice powder P of the hopper 6 to the injection gun 7. A powder hose 8, an air hose 10 that guides compressed air from an air compressor 9 as a pressure source to the injection gun 7, and an on / off operation unit that is provided in the injection gun 7 and starts and stops the injection of the compressed air and the dry ice powder P The on / off lever 11 and the nozzle switch 12 are provided.

  The frame 3 includes a placement portion 15 on which the dry ice block B is placed, and a cutting blade 17 is provided so as to slightly protrude upward from a slit 16 formed in the placement portion 15. The dry ice block B is placed so as to be pressed. The holder 4 includes a plurality of needles 4 a, and these needles 4 a bite into the upper surface of the dry ice block B and transmit rotational torque to the block B. The holder 4 is connected to a motor 20 via a drive shaft 18 and a speed reduction mechanism 19. The motor 20 is an electric motor or an air motor, and its output is distributed via a speed reduction mechanism 19 to a drive shaft 18 that rotates the holder 4 and a screw shaft 21 that lowers the holder 4 according to cutting. The screw shaft 21 is held by the speed reduction mechanism 19 and is screwed with a nut 22 provided on a part 3 a of the frame 3.

  For example, as shown in FIG. 6, the dry ice block B has a prismatic shape, the bottom surface of which is pressed against the cutting blade 17, and the drive shaft 18 of the holder 4 on the rotary sliding surface 23 formed on the mounting portion 15. Rotate around. The hopper 6 only needs to have a shape in which the cross section gradually decreases from the upper opening 6a toward the lower part. In this example, the slit 16 formed in the mounting portion 15 is included in the center of its own opening 6a. An inverted conical wax shape or a trumpet shape (a curved shape in which an inverted conical peripheral wall bulges toward the center line side) is provided, and a powder hose 8 is connected to the lower part thereof. In addition, the thin line drawn on the inner peripheral surface of the hopper 6 is for, for example, showing a trumpet-shaped curved surface in three dimensions, and the thin line itself does not indicate a special substance. In FIG. 4, the dry ice block B is placed on the placement portion 15 with the holder 4 in the raised end position, and then the holder 4, the speed reduction mechanism 19, and the motor 20 are pushed downward by, for example, the operator's force. Then, the screw shaft 21 follows and rotates, and the needle 4a of the holder 4 pierces the upper surface of the dry ice block B and holds it.

  When the dry ice block B is rotated through the holder 4 by the rotation of the motor 20, the block B is cut by the cutting blade 17 to obtain the dry ice powder P, which is passed through the slit 16 of the mounting portion 15 to the hopper 6. Be contained. The screw shaft 21 is also rotated by the drive of the motor 20, and as the cutting progresses, the holder 4 is displaced downward by the action of the screw shaft 21, and the motor 20 stops at the lower limit position where the holder 4 approaches the cutting blade 17. The dry ice block B is placed on the placement unit 15. The motor 20 is connected to a controller 25, and an operation panel 26 is connected to the controller 25 as a powder particle size changing operation unit that changes the particle size of the dry ice powder P by changing the rotation speed of the motor 20. Are arranged at appropriate positions on the frame 3.

  The operation panel 26 is switched to, for example, a plurality of stages, thereby changing the rotation speed of the motor 20 and thus the particle size of the dry ice powder P obtained by cutting the dry ice block B. For example, when the dial is aligned with the scale 1 of the operation panel 26, the rotational speed of the motor 20 becomes the slowest, whereby the relative speed between the dry ice block B and the cutting blade 17 becomes small, so that the dry ice powder P with large particles can be obtained. In contrast, when the dial is adjusted to the scale 5 and the rotational speed of the motor 20 is increased, the relative speed between the cutting blade 17 and the dry ice block B is increased, and powder P having a small particle size is obtained.

  If the particle size of the powder P is small, its mass is small. Therefore, the dry ice powder P is compressed from the spray gun (nozzle) 7 to the communication path 104 and the air conditioning function unit (see FIGS. 1 to 3) that are the objects to be cleaned. The impact energy when jetting with air is small, and the dry ice powder P having a large particle size has a large mass and a large impact energy by jetting. Therefore, the particle size of the dry ice powder P is adjusted to a plurality of levels (5 levels in the illustrated example) or continuously or continuously according to the strength of the object to be cleaned and the purpose of cleaning.

  The compressor 9 as a pressurizing source is provided with wheels 29 and can move along with the blasting device 1, and compressed air generated by the compressor 9 is supplied to the air hose 10 through the compressor hose 30 and the electromagnetic valve 31. Then, it is guided to the spray gun 7 through the hose 10. The spray gun 7 is gripped by an operator. When the on / off lever 11 is gripped, the nozzle switch 12 built in the gun 7 is turned on, and when the lever 11 is released, the nozzle switch 12 is turned off.

  As shown in FIG. 5, the nozzle switch 12 is connected to the controller 25 together with the motor 20 and the electromagnetic valve 31, and supplies an on / off signal to the controller 25. The controller 25 includes a CPU 33, a timer 34, a sequence circuit 35, and a control program 36. For example, when receiving an ON signal from the nozzle switch 12, the controller 25 opens the electromagnetic valve 31 to guide compressed air from the compressor 9 to the nozzle gun 17. After the time limit is measured, the motor 20 is started via the sequence circuit 35. When receiving an off signal from the nozzle switch 12, the controller 25 outputs a command signal for stopping the motor 20 and closing the electromagnetic valve 31. The control program 36 is a program in which a program to be described later for controlling the entire blast apparatus 1 is written in a memory, and is executed by the CPU 33.

  As shown in FIG. 7, a powder hose 8 and an air hose 10 are connected to the spray gun 7, and they merge to form one ejection hole. When compressed air flows from the air hose 10 at a high speed in the spray gun 7, the air in the powder hose 8 is sucked by the venturi effect, and the dry ice powder P present in the hopper 6 is sucked and supplied to the spray gun 7. The dry ice powder P is sprayed from the tip (nozzle) of the spray gun 7 in a state where the dry ice powder P is mixed in a mist state with compressed air. By making the hopper 6 into an inverted conical wax shape or a trumpet shape, dry ice powder P is uniformly and smoothly guided to the spray gun 7 from the entire peripheral surface of the hopper 6 through the powder hose 8 in accordance with the venturi effect. . The output of the air compressor 9, and the compressed air pressure, for example, is about 0.1 MP (megapascal) to 0.7 MP (1 to 7 kgf / cm 2), and fine dry ice powder P having a small mass should be used. Therefore, powder injection for cleaning or the like can be performed even at a low pressure of about 0.1 MP (1 kgf / cm 2). As a result, a so-called small-output baby compressor can be used as the air compressor 9, thereby moving a lightweight and small mobile air compressor that moves with the movement of the blasting device 1 (for example, moved by being pulled by the blasting device 1). Accordingly, the blasting device 1 can be moved to a necessary location together with the air compressor 9 and used for various purposes including cleaning.

  As shown in FIG. 12 (d), the cutting blade 17 bites into the bottom surface of the block B in the forward rotation of the dry ice block B, and performs cutting in the opposite direction as shown in FIG. 12 (b). The direction or angle of the blade edge is set so that the cutting blade 17 does not bite into the dry ice block B during (reverse rotation).

  Next, the overall operation of the blasting apparatus 1 will be described based on the flowchart of the control program shown in FIG. In S1, when the power is turned on, the compressor 9 is started, and in S2, it is determined whether or not the dry ice block B has been placed at a predetermined position of the placement portion 15 (for example, a positioning switch is turned on). ). Then, in S3, the holder 4 descends and is pressed against the upper surface of the dry ice block B, and the needle portion 4a bites into the holder and holds the block B. In this step, for example, the screw shaft 21 in FIG. 1 can be rotated by a dedicated motor prepared separately from the motor 20 and the holder 4 can be lowered, or the holder 4 is lowered by an air cylinder or the like instead of the motor. You can also. In this example, the operator can manually push down the holder 4 via the speed reduction mechanism 19 and press it against the upper surface of the dry ice block B. In this state, when the operator grasps the lever 11 of the injection gun 7 and the nozzle switch 12 is turned on (S4), the solenoid valve (valve) 31 is opened in S5, and the compressed air generated in the compressor 9 is sent to the injection gun 7. Sent.

  Further, a predetermined time limit (for example, about 2 to 5 seconds) is set by the timer 34 of FIG. 5 in S6, and this state continues until time is up in S7. In the order of explanation of the program of FIG. 8, it is a story at the time of the first start-up. For example, after S13, the nozzle switch 12 is turned on again by S4 (that is, spraying of dry ice powder P is performed, which is once Assuming that the fuel is stopped and injection is performed again), as shown in FIG. 9, the rotation of the dry ice block B is stopped and not cut. However, since the solenoid valve 31 is in the open state, the compressed air is guided to the injection gun 7 through the air hose 10 and is ejected from the injection gun 7 at a high speed. Therefore, the dry ice powder remaining in the powder hose 8 due to the above-mentioned venturi effect. P is sucked toward the spray gun 7 and ejected together with the compressed air. As shown in FIG. 10, when the dry ice powder P remaining in the powder hose 8 is almost discharged out of the hose 8, a time limit elapses (time up in S7), and the motors 20 in S8 and S9 in FIG. This is the step of restarting cutting of the dry ice block B by the activation of.

  Here, as shown in FIG. 12A, in the state where the cutting of the dry ice block B is stopped halfway, the cutting blade 17 bites into the bottom surface of the block B, and a step (step) is generated. If the motor 20 is driven as it is and cutting is started, a large load is applied to the motor 20. Therefore, as shown in FIGS. 12A and 12B, the motor 20 is reversely rotated by a predetermined angle (for example, in a range of 360 ° or less), and thereafter, as shown in FIGS. 12C and 12D, If the motor 20 is rotated forward and cutting is started from the position shown in (d), the relative speed is generated between the cutting blade 17 and the step of the dry ice block B at the start of cutting. The initial torque associated with can be reduced. This is steps S8 and S9 in FIG. By restarting the cutting, as shown in FIG. 11, the newly cut dry ice powder P is supplied to the spray gun 7 through the powder hose 8 after being cleaned. While the nozzle switch 12 remains on, the block B continues to be cut by the rotation (forward rotation) of the dry ice block B by the motor 20, and the dry ice powder P obtained thereby is sent to the spray gun 7, A cleaning operation is performed by being injected together with the compressed air to the communication path 104 and the air conditioning function unit, which are objects to be cleaned (see FIGS. 1 to 3).

  When the nozzle switch 12 is turned off in S10, the motor 20 is stopped in S11, the cutting of the dry ice block B is finished, the electromagnetic valve 31 is closed in S12, and the injection of the compressed air and the dry ice powder P from the injection gun 7 is performed. Stop. If the power switch is turned off in step S13, the process ends. If not, the process returns to step S4 to determine whether the nozzle switch 12 is turned on. Thereafter, the same process is repeated.

  As shown in FIGS. 9 to 11, when the injection from the injection gun 7 is resumed, the dry ice powder P remaining in the powder hose 8 is discharged from the powder hose 8 and further from the injection gun 7. Since the dry ice powder P prepared in this step is supplied to the spray gun 7, the powders remaining in the powder hose 8 combine to form an ice lump, which causes clogging and damages the object. Inconvenience is eliminated.

  Note that steps S6 and S7 (step A) in FIG. 8 may be inserted between S11 and S12. In this case, when the injection from the injection gun 7 is interrupted and the nozzle switch 12 is turned off, the motor 20 is stopped in S11, and the cutting of the dry ice block B is also stopped accordingly. Thereafter, the time limit is set by the timer 34, and the electromagnetic valve 31 in FIG. 4 is kept open until the time limit expires. Therefore, the compressed air from the compressor 9 continues to be supplied to the injection gun 7 through the air hose 10 within the time limit. Therefore, as shown in FIGS. 9 and 10, the dry ice powder P remaining in the powder hose 8 is discharged from the spray gun 7 to the outside within the time limit after the injection is stopped.

  In the above description, S5 to S7 in the controller 25 and the control program 36 shown in FIG. 8 function as cleaning means, and S5 to S7 in FIG. 8 serve as a powder supply control unit for the cleaning. Further, when the steps S6 and S7 are inserted between S11 and S12, the above-described controller 25 and these steps S11 and S12 serve as a powder supply control unit as a cleaning means. Similarly, the controller 25 and S10 and S11 in FIG. 8 are cutting stop control units, and S8 and S9 are cutting resumption control units. Moreover, description of the control program of FIG. 8 also becomes the Example of the air-conditioning equipment cleaning method of this invention. In FIG. 8, S6 and S7 next to S5 and S6 and S7 next to S11 can be provided in an overlapping manner. In this case, the cleaning process is performed both when the spray gun 7 is turned on and off. Is done.

(Example 2)
FIG. 13 is an explanatory view showing another embodiment of the air-conditioning equipment cleaning method according to the present invention, in which the installation mode of the indoor unit as the air-conditioning equipment is a ceiling-embedded type or ceiling-suspended type air conditioner (air-conditioner cleaning) Represents. The ceiling-embedded or ceiling-suspended indoor unit 200 shown in FIG. 13 includes a plurality (one on each side in the figure) around a rectangular (square in the figure) suction port 202 located in the center. A total of four outlets 203 are provided, and the inlet 202 and each outlet 203 are connected to each other through a communication path (not shown).

  Therefore, as shown in FIG. 13A, when the intake port 202 of the indoor unit 200 is used as the supply port 250 for cleaning and the plurality of outlets 203 are used as the discharge ports 251 for cleaning, A temporary filter 252 is installed so as to cover the discharge port 251 (blow-out port 203), and dry ice powder P and compressed air are injected from the supply port 250 (suction port 202).

On the other hand, when the plurality of outlets 203 of the indoor unit 200 are used as the supply port 250 ′ for cleaning and the suction port 202 is used as the discharge port 251 ′ for cleaning, two cleaning modes are possible.
(1) First cleaning mode As shown in FIG. 13B, in the cleaning mode in which each outlet 203 is used as a supply port 250 ′ for cleaning, a temporary discharge port 251 ′ (suction port 202) is provided. The filter 252 ′ is installed, and the dry ice powder P and the compressed air are simultaneously sprayed from all the supply ports 250 ′ (the air outlet 203).

(2) Second Cleaning Mode As shown in FIG. 13C, in the cleaning mode in which each outlet 203 is individually used as a supply port 250 ′ for cleaning, either dry ice powder P or compressed air is used. Since injection is performed from the two supply ports 250 ′ (air outlet 203), a temporary filter 252 ″ is installed so as to cover the discharge port 251 ′ (suction port 202) and the remaining three supply ports 250 ″ (air outlet 203). To do. As a result, when dry ice powder P and compressed air are jetted from the supply port 250 ′, the contaminants that jump out from the discharge port 251 ′ and the remaining supply port 250 ″ can be captured by the temporary filter 252 ″. Then, as the supply port 250 ′ for injecting dry ice powder P and compressed air is sequentially changed, the installation position (covering range) of the temporary filter 252 ″ is also changed sequentially.

(Example 3)
FIG. 14 is an explanatory view showing still another embodiment of the air conditioning equipment cleaning method according to the present invention, and shows a case where the air conditioning equipment is an air purifier. An air purifier 300 shown in FIG. 14 includes a communication passage 304 that circulates air in a room, a factory, or the like from a suction port 302 that opens sideways to a blowout port 303 that opens upward. The communication passage 304 is provided with an air conditioning function unit such as a dust collection filter 307 disposed behind the suction port 302 to collect dust and the like from the circulating air, and a blade 305a of a sirocco fan 305 as a blower fan. The air is purified by removing fine particles such as dust, pollen, house dust, and oil mist floating in the air, and removing odors emitted from pets and the indoor environment.

  The air outlet 300 of the air cleaner 300 is used as a supply port 350 for cleaning, and the suction port 302 is used as a discharge port 351 for cleaning. A temporary filter 352 is placed on the discharge port 351 (suction port 302) from the outside, and is temporarily closed while the air cleaner 300 is being cleaned internally. Normally, the dust collection filter 307 is detachable from the air purifier 300, so it is removed and washed separately. However, it remains attached to other air conditioning function units (such as the blades 305a of the sirocco fan 305) or the communication path 304. It may be washed at the same time.

  The dry ice powder P is injected from the supply port 350 toward the communication path 304 together with the compressed air by the injection gun 7 (injection unit). When the dry ice powder P contacts or impacts the surface of the air conditioning function unit such as the blade 305a of the sirocco fan 305 or the inner wall surface 304a of the communication path 304, the dirt substance C such as oil mist or dust Separate from the soiled areas of these surfaces. The dirt substance C separated from the dirt spot is carried by the flow of compressed air (and dry ice powder P) and led to a temporary filter 352 installed at the discharge port 351 and captured. Most dry ice powder P sublimates into a gas (carbon dioxide) when separating the dirt substance C from the dirt spot, passes through a temporary filter 352 together with compressed air, and is discharged to the outside. If dry ice powder P is not present, it is captured by the temporary filter 352 together with the dirt substance C. The compressed air passes through a temporary filter 352 and is discharged to the outside.

  After the injection of the dry ice powder P and compressed air is stopped by operating the spray gun 7, the temporary filter 352 that captures the dirt substance C is removed from the discharge port 351 (suction inlet 302) to remove the dirt substance C from the air. Remove from the cleaner 300. Next, when the dry ice powder P and the compressed air are sprayed so as to flow in the direction opposite to that in FIG. 14 in the communication path 304, the dirt substance C separated from the dirt spot is obtained as in FIG. 3 (Example 1). It is captured by a temporary filter installed on the outlet 303 side.

Example 4
FIG. 15 is an explanatory view showing still another embodiment of the air conditioning equipment cleaning method according to the present invention, and shows a case where the air conditioning equipment is an electric dust collector. An electrostatic precipitator 400 shown in FIG. 15 includes a communication path 404 that circulates air in a room, a factory, or the like from an inlet 402 connected to a blower duct to an outlet 403 connected to the suction duct. In the communication path 404, there are air-conditioning function units such as a blade 405a of an ionizer unit 405 (charging unit) charged to a negative high voltage and a plate 406a of a collector unit 406 (dust collecting unit) having a positive charge. The air is cleaned by adsorbing and collecting fine particles such as dust and oil mist, which are provided and charged to the negative electrode by corona discharge of the ionizer unit 405, by the positive electrode collector unit 406. A plurality (three in the drawing) of blades 405 a of the ionizer unit 405 are arranged in parallel to the air flow on the side close to the suction port 402, and the plate 406 a of the collector unit 406 has an air flow on the side close to the air outlet 403. Are arranged in parallel with each other (five in the figure). Since the electrostatic precipitator 400 includes many ionizers 405 for corona discharge and high voltage components, moisture is strictly prohibited, and thus liquid cannot be used as a cleaning medium. Reference numeral 407 denotes a dust collection filter disposed immediately after the suction port 402 in order to collect relatively large dust or the like from air flowing from the suction port 402 to the blower outlet 403.

  The discharge port 403 of the electric dust collector 400 is used as a supply port 450 for cleaning, and the suction port 402 is used as a discharge port 451 for cleaning. The discharge port 451 (suction port 402) is covered with a temporary filter 452 from the outside, and is temporarily closed while the inside of the electrostatic precipitator 400 is cleaned. In general, the dust collection filter 407 is detachable from the electric dust collector 400, and thus is removed and separately cleaned.

  The dry ice powder P is sprayed from the supply port 450 toward the communication path 404 together with the compressed air by the spray gun 7 (spray unit). When the dry ice powder P comes into contact with or impacts the surface of the air-conditioning function section such as the blade 405a of the ionizer section 405 and the plate 406a of the collector section 406, the inner wall surface 404a of the communication path 404, etc. The soil material C is separated from the soiled portions of these surfaces. The dirt substance C separated from the dirt spot is carried by the flow of compressed air (and dry ice powder P) to the temporary filter 452 installed at the discharge port 451 and captured. Most dry ice powder P sublimates into a gas (carbon dioxide) when separating the dirt substance C from the dirt spot, passes through a temporary filter 452 with compressed air, and is discharged to the outside. When the dry ice powder P that is not present is present, it is captured by the temporary filter 452 together with the dirt substance C. The compressed air passes through a temporary filter 452 and is discharged to the outside.

  After the spraying of the dry ice powder P and compressed air is stopped by operating the spray gun 7, the temporary filter 452 that captures the dirt substance C is removed from the discharge port 451 (suction port 402), so that the dirt substance C is electrically removed. Remove from dust collector 400. Next, when the dry ice powder P and the compressed air are sprayed so as to flow in the direction opposite to that in FIG. 15 in the communication path 404, the dirty substance C separated from the dirty portion is the same as in FIG. 3 (Example 1). It is captured by a temporary filter installed on the outlet 403 side.

  As described above, the dry ice powder as a cleaning medium is in a solid state when sprayed to a soiled area. Therefore, it is easy to separate the soiled substance by impact energy, and when it is sublimated into a gas (carbon dioxide), it is left in the air as it is. Can be released. Therefore, the dry ice powder can be used with peace of mind even for an air conditioner such as the electric dust collector 400 that cannot use a liquid as a cleaning medium.

(Example 5)
FIG. 16 is an explanatory view showing still another embodiment of the air conditioning equipment cleaning method according to the present invention, and shows the case where the air conditioning equipment is a centrifugal oil mist collector. The oil mist collector 500 shown in FIG. 16 includes a communication passage 504 that allows air contaminated in the factory to flow from the inlet 502 connected to the air duct to the outlet 503 connected to the suction duct. In the communication path 404, an air-conditioning function unit such as a mist processing plate 505a rotated by a motor 505b of a mist collecting unit 505, a blade 506a of a propeller fan 506 as a blower fan rotated by a motor 506b, and the like. Is provided. The mist processing plate 505a has through holes 505c (or recesses) for collecting mist, and one or a plurality (three in the figure) are arranged in the air flow direction. Oil mist or the like floating in the air is collected by the mist processing plate 505a of the mist collecting unit 505, liquefied, centrifuged by rotation, and dropped into the oil reservoir 504b, thereby cleaning the air.

  The blowout port 503 of the oil mist collector 500 is used as a supply port 550 for cleaning, and the suction port 502 is used as a discharge port 551 for cleaning. A temporary filter 552 is placed on the discharge port 551 (suction port 502) from the outside, and is temporarily closed during the internal cleaning of the oil mist collector 500.

  The dry ice powder P is sprayed from the supply port 550 toward the communication path 504 together with the compressed air by the spray gun 7 (spray unit). The dry ice powder P contacts or impacts the surface of the air-conditioning function unit such as the mist processing plate 505a of the mist collecting unit 505, the blade 506a of the propeller fan 506, the inner wall surface 504a of the communication passage 504, and the like. Thus, the soil substance C such as oil mist is separated from the soiled portions on these surfaces. The dirt substance C separated from the dirt spot is guided and captured by a temporary filter 552 installed in the discharge port 551 on the flow of compressed air (and dry ice powder P). Most dry ice powders P sublimate into a gas (carbon dioxide) when separating the soil substance C from the soiled part, pass through a temporary filter 552 together with compressed air, and are discharged to the outside. When the dry ice powder P that is not present is present, it is captured by the temporary filter 552 together with the dirt substance C. The compressed air passes through a temporary filter 552 and is discharged to the outside.

  After the spraying of the dry ice powder P and compressed air is stopped by operating the spray gun 7, the temporary filter 552 that captures the dirt substance C is removed from the discharge port 551 (suction port 502), whereby the dirt substance C is oiled. Remove from mist collector 500. Next, when the dry ice powder P and the compressed air are sprayed so as to flow in the direction opposite to that in FIG. 16 in the communication path 504, as in FIG. 3 (Example 1), the dirt substance C separated from the dirt spot is It is captured by a temporary filter installed on the outlet 503 side.

1 Blasting device 3 Frame 4 Holder 6 Hopper 7 Injection gun (injection part)
8 Powder hose 9 Air compressor (pressure source)
10 Air hose 11 ON / OFF lever 12 Nozzle switch (11 + 12 = ON / OFF control part)
DESCRIPTION OF SYMBOLS 15 Mounting part 17 Cutting blade 20 Motor 21 Screw shaft 25 Controller 26 Operation panel (powder particle size change operation part)
31 Solenoid valve 34 Timer 36 Control program 100 Indoor unit (air conditioner)
101 Indoor heat exchanger 101a Fin (air conditioning function part)
102 Inlet 103 Outlet 104 Communication path 104a Inner wall 105 Cross flow fan (fan)
105a Feather (air conditioning function part)
106 Wind direction plate (air conditioning function part)
107 Air Conditioner Filter 110 Outdoor Unit 150, 150 ′ Supply Port 151, 151 ′ Discharge Port 152, 152 ′ Filter C Dirt Substance P Dry Ice Powder

Claims (8)

It exists in at least one of the air-conditioning function section and the communication path of the air-conditioning equipment that is provided with a communication path that circulates air from the inlet to the outlet and that performs air conditioning by the air-conditioning function section provided in the communication path. An air conditioner cleaning method for removing dirt substances,
One of the suction port and the blower port is a supply port for cleaning, and the other is a discharge port, and the discharge port is provided with a temporary filter that has air permeability and prevents the passage of dirt substances. To cover temporarily,
By spraying dry ice powder together with compressed air from the supply port toward the discharge port, the dirt substance is separated from the dirt spot by contact or impact of the dry ice powder, and the separated dirt substance is at least compressed air. When there is dry ice powder that is not sublimated, it is captured by the temporary filter along with the dry ice powder when it is guided to the temporary filter installed at the discharge port on the flow of At least compressed air passes through the temporary filter and is discharged outside.
A cleaning method for an air conditioner, wherein after removing spraying of dry ice powder and compressed air, the contaminant is removed from the air conditioner by removing a temporary filter that captures the contaminant from the outlet. The suction port and the discharge port were changed from the previous time so that the discharge port was a new supply port for cleaning, and the supply port was a new discharge port. As with the previous time, the temporary outlet is covered with a temporary filter from the outside,
Dry ice powder and compressed air are sprayed from the new supply port to the new discharge port in the opposite direction to the previous passage, and the contaminants are collected by a temporary filter installed at the new discharge port. As well as captured and
The air-conditioning equipment washing | cleaning method of Claim 1 which removes a dirt substance from the said air-conditioning equipment by removing the temporary filter which captured the dirt substance from a new discharge port, after stopping injection of dry ice powder and compressed air.   The air conditioning apparatus according to claim 1 or 2, wherein the dry ice powder is produced by cutting a dry ice block and is supplied to an injection unit, and the dry ice powder is injected into the communication path from the injection unit together with compressed air. Cleaning method.   When the spray unit starts spraying dry ice powder and compressed air, cutting of the dry ice block is started, and when the spray unit stops spraying dry ice powder and compressed air, the cutting of the dry ice block is stopped. The air-conditioning equipment cleaning method according to claim 3. Dry ice powder made by cutting is supplied to the spraying part through a powder hose,
By supplying compressed air in a state where supply of dry ice powder is stopped until the time limit has elapsed from the start of injection of the injection unit, at least dry ice powder remaining in the powder hose is discharged from the injection unit. The air-conditioning equipment washing | cleaning method of Claim 3 or 4 which supplies a new dry ice powder to the said powder hose, and guides it to the said injection | spraying part after time limit has passed. Dry ice powder made by cutting is supplied to the spraying part through a powder hose,
By continuing to supply the compressed air with the supply of dry ice powder stopped until the time limit has elapsed since the injection stop of the injection unit, at least dry ice powder remaining in the powder hose is discharged from the injection unit. The air-conditioning equipment cleaning method according to claim 3 or 4, wherein the cleaning is performed.   While the dry ice block is rotated forward by a motor, the cutting blade bites into the dry ice block to perform cutting, and the cutting blade does not cut into the dry ice block and does not cut against the reverse rotation of the motor. The air-conditioning equipment cleaning method according to any one of claims 3 to 6, wherein when the spraying unit starts spraying, the motor is once rotated reversely and then turned to forward rotation to start cutting. .   The air-conditioning equipment washing | cleaning method of Claim 7 which changes the particle size of the dry ice powder scraped off from a dry ice block by changing the rotation speed of the said motor.

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