JP2014095746A - Air conditioner and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dew condensation without consuming unnecessary power.SOLUTION: An air conditioner includes: a first heat exchanger 420 that functions as a condenser; a second heat exchanger 430 that functions as an evaporator; a first duct 600 as a first air blowing path through which an air current passing through the first heat exchanger 420 flows to a guide plate 100 that is a first place; and second ducts 32Y, M, C, and K as second air blowing paths through which an air current passing through the second heat exchanger 430 flows to developing units 19Y, M, C, and K that are second places. When blowing the air current having passed the second heat exchanger 430 and cooled, from the second ducts 32Y, M, C, and K to the developing units 19Y, M, C, and K, the air conditioner blows the air current having passed through the first heat exchanger 420 from the first duct 600 to the guide plate 100.

Description

  The present invention relates to an air conditioner and an image forming apparatus. More specifically, the present invention relates to an air conditioner that air-conditions a heat generating part of an electronic device or a heat generating part of a home appliance, and a copier, a printer, a facsimile, and at least two functions thereof. The present invention relates to an image forming apparatus equipped with a heat generating part such as a multifunction peripheral equipped with an air conditioner for cooling a portion where the temperature rises by the heat generating part.

  An electrophotographic image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine having at least two of these functions includes a reading device, a writing device, a photoconductor, a developing device, etc. It has many units that generate heat. Therefore, in order to control the temperature and humidity environment in the machine, it is generally performed to take in external air and control the machine environment.

  However, if the in-machine environment is adjusted only with external air, the efficiency of the in-machine environment is poor because the control of the in-machine environment depends on the temperature and humidity of the external atmosphere. In view of this, for example, Japanese Patent Application Laid-Open No. 2012-073596 (Patent Document 1) proposes an image forming apparatus in which an air conditioner (air conditioner) is mounted to control the in-machine environment.

  An image forming apparatus according to this proposal has an air supply port, an air supply device, an exhaust device, a cooling device, and a ventilation unit that partially shields the air supply port to allow air to pass therethrough. A detachable cover, and the cover can be selectively attached to a common air supply port. When the cooling device is attached to the air supply port, the air supply device is a cooling device. When the cover is attached to the air supply port, the air supply device passes the outside air directly through the cover's ventilation section. It is configured to supply to.

  In the image forming apparatus, an increase in the temperature inside the apparatus is one problem, but dew condensation due to moisture on the paper is also one of the major problems. In particular, after passing through the fixing portion, a large amount of moisture is generated from the paper, and the environment is likely to cause condensation.

  However, the image forming apparatus proposed in Patent Document 1 can switch the attachment / detachment state of the cooling device with a simple configuration without substantially changing the air flow inside the apparatus main body, and is effective according to demand. In particular, the inside of the apparatus main body can be cooled, and no special consideration is given to condensation.

  In view of the dew condensation countermeasure, there is a method of ventilating. Usually, however, an air conditioner provided for cooling the inside of the image forming apparatus must be heated. This means that extra power is consumed when taking measures against condensation using an air conditioner.

  Therefore, a problem to be solved by the present invention is to prevent condensation without consuming extra power.

  In order to solve the above problems, the present invention is an air conditioner including a first heat exchanger that functions as a condenser and a second heat exchanger that functions as an evaporator, wherein the first heat exchanger functions as an evaporator. A first air passage that blows the airflow passing through the heat exchanger to the first location, and a second air passage that blows the airflow passing through the second heat exchanger to the second location. When the airflow that has passed through the second heat exchanger and is cooled is blown from the second air passage to the second location, the airflow that has passed through the first heat exchanger is the first airflow. It is characterized by sending air to the first location from the air supply path.

According to the present invention, condensation can be prevented without consuming extra power.
Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a diagram illustrating a schematic configuration of an image forming apparatus including an air conditioner according to an embodiment. It is a block diagram which shows the control structure for performing the airflow control to the guide plate in this embodiment. It is a flowchart which shows the control procedure of the airflow control to the guide plate performed by the control part of FIG. It is a figure which shows the modification of this embodiment.

  The present invention is characterized in that the airflow that has passed through the condenser during cooling is caused to flow around the conveyance path of the location to be cooled, the airflow around the location is circulated, and condensation at the location to be cooled is prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of an image forming apparatus according to the present embodiment. In the figure, the image forming apparatus PR includes an image forming unit 1 in which four image forming units 11Y, 11M, 11C, and 11K are arranged in parallel. Each of the image forming units 11Y, 11M, 11C, and 11K is a drum-shaped photoconductor 18Y, M, C, K serving as a latent image carrier, a drum cleaning unit 12Y, M, C, K, and a charging unit 13Y, M, C, Indispensable image forming elements for forming an image by an electrophotographic method such as K, two-component developing units 19Y, 19M, 19C, and 19K, and a charge eliminating unit are housed in a frame (not shown). These image forming units 11Y, 11M, 11C, and 11K are detachable from the main body of the image forming apparatus as process units, and the consumable parts of each color can be independently replaced at a time. Y represents yellow, M represents magenta, C represents cyan, and K represents black.

  Above the image forming unit 1, an exposure unit 9 is provided as a latent image forming unit. In addition, a reading device 10 that scans and reads a document placed on a contact glass is provided at the top of the device. Below the image forming unit 1, a transfer unit 2 including an intermediate transfer belt 15 as an intermediate transfer member is provided. The intermediate transfer belt 15 is stretched around a plurality of support rollers, and rotates in the clockwise direction in the drawing.

  A secondary transfer device 4 is provided below the transfer unit 2. The secondary transfer device 4 includes a secondary transfer roller 17. The secondary transfer roller 17 is in contact with a portion of the intermediate transfer belt 15 that is wound around the transfer counter roller 16 from the belt front surface to form a secondary transfer nip. A secondary transfer bias is applied to the secondary transfer roller 17 by a power source (not shown). The transfer counter roller 16 is electrically grounded. Thereby, a secondary transfer electric field is formed in the secondary transfer nip.

  On the left side of the secondary transfer device 4 in the figure, a fixing unit 7 having a heating roller having a heating element therein is provided in order to fix the toner image transferred onto the paper. Between the secondary transfer device 4 and the fixing unit 7, a conveying belt 6 that conveys the paper after the toner image transfer to the fixing unit 7 is provided. Below the apparatus, there is provided a paper feed unit 3 that feeds paper that is separated and fed one by one from a paper feed accommodating section (not shown) to the secondary transfer device 4. In addition, a paper discharge unit 8 that transports the paper that has passed through the fixing unit 7 to the outside of the apparatus or to the duplex unit 5 is provided.

  When making a copy with the image forming apparatus PR configured as described above, the document is read by the reading device 10. In parallel with this document reading, the intermediate transfer belt 15 moves in the clockwise direction in the figure. At the same time, in the image forming unit 1, yellow Y and magenta are formed on the photosensitive members 18Y, M, C, and K whose surfaces are charged by the charging units 13Y, 13M, 13C, and 13K, respectively, based on the read document contents. A latent image is formed by exposure by the exposure unit 9 using color-specific information of M, cyan C, and black K, respectively.

  Next, the latent images on the photoconductors 18Y, 18M, 18C, and 18K are developed by the developing units 19Y, 19M, 19C, and 19K to form single-color toner images (developed images). Then, the toner images on the photoconductors 18Y, 18M, 18C, and 18K are sequentially transferred onto the intermediate transfer belt 15 so as to overlap each other, and a composite toner image is formed on the intermediate transfer belt 15. The photosensitive members 18Y, 18M, 18C, and 18K after the transfer of the toner image are removed by the drum cleaning units 12Y, 12M, 12C, and 12K to remove residual toner remaining on the photosensitive members 18Y, 18M, 18C, and 18K. Prepare for image formation.

  In parallel with such toner image formation, the paper is fed out one by one from a paper feed accommodating portion (not shown), and abutted against the registration roller 14 to be stopped. Then, the registration roller 14 is rotated in synchronization with the movement and timing of the toner image superimposed on the intermediate transfer belt 15. As a result, the sheet is fed between the intermediate transfer belt 15 and the secondary transfer device 4, and the toner image is transferred to the fed sheet by the secondary transfer device 4.

  Next, the sheet on which the toner image is transferred is transported by the transport belt 6 and sent to the fixing unit 7. In the fixing unit 7, heat and pressure are applied to the paper to fix the toner image on the paper. After fixing, the paper is guided by the guide plate 100 and sent to the paper discharge unit 8. In the paper discharge unit 8, the conveyance path is switched by the switching claw, and the paper is guided to a paper discharge tray (not shown) outside the apparatus (on the left side of the apparatus) or the double-side unit 5 below. In the duplex unit 5, the sheet is reversed and guided again to the secondary transfer position (nip position between the secondary transfer device 4 and the intermediate transfer belt 15). Eject onto the output tray. The intermediate transfer belt 15 after the image transfer is removed by the intermediate transfer belt cleaning unit 90 to remove residual toner remaining on the intermediate transfer belt 15 and prepare for another image formation.

  FIG. 2 is a diagram illustrating a schematic configuration of an image forming apparatus including an air conditioner (air conditioner) 400 according to the present embodiment.

  FIG. 2 shows the image forming unit 1 and the air conditioner 400 of the image forming apparatus PR. In FIG. 2, the second ducts 32Y, 32M, 32C, and 32K are arranged in parallel in the developing units 19Y, M, C, and K of the respective color image forming units 11Y, 11M, 11C, and 11K of the image forming unit 1, respectively. The cooling airflow is sent from the air conditioner 400 to the second ducts 32Y, 32M, 32C, 32K via the cooling circulation path 700, and the airflow that is heat-exchanged from the second ducts 32Y, 32M, 32C, 32K It comes to return. On the other hand, the warm air discharged from the air conditioner 400 is sent to the guide plate 100 via an air flow discharge path (hereinafter referred to as a first duct) 600. The first duct 600 is provided with an airflow generation device (fan) 200, and warm air is forcibly sent to the guide plate by the airflow generation device 200.

  The air conditioner 400 includes a compressor 410 that compresses the refrigerant, a first heat exchanger (condenser) 420 that performs heat exchange between the refrigerant and air, a second heat exchanger (evaporator) 430, and decompresses the refrigerant. The expansion valve 440 includes a four-way valve 450 that switches the refrigerant flow path. Moreover, air can be heated or cooled by repeating the following cycles.

1. Compression: The low-pressure / low-temperature refrigerant vapor is compressed by the compressor 410 into a high-pressure / high-temperature refrigerant vapor.
2. Condensation: Refrigerant vapor that has become high pressure and high temperature in the compressor 410 is sent to the first heat exchanger (condenser) 420 to be cooled by exchanging heat with air to form a refrigerant liquid (the air is heated). ) 3. Expansion: The high-pressure refrigerant liquid liquefied by the first heat exchanger (condenser) 420 is decompressed by the expansion valve 440.
4). Evaporation: The refrigerant liquid decompressed by the expansion valve 440 evaporates in the second heat exchanger (evaporator) 430 and takes heat from the air (the air is cooled).

  In the image forming apparatus PR shown in FIG. 2, the air flow cooled by the second heat exchanger 430 is sent to the second ducts 32Y, 32M, 32C, 32K via the cooling circulation path 700, and the developing unit 19Y. , M, C, K are cooled. The airflow that has passed through the second ducts 32Y, 32M, 32C, 32K is returned to the second heat exchanger 430.

  Further, valves 300-1, 2, 3, and 4 that can be independently operated are provided in the flow paths immediately before the second ducts 32Y, 32M, 32C, and 32K, respectively. When the valves 300-1, 2, 3, and 4 are opened, the airflow is supplied to the second ducts 32Y, 32M, 32C, and 32K, the cooling state is established, and the valves 300-1, 2, 3, and 4 are closed. Then, the supply of the air current is stopped, and an uncooled state is entered. The valves 300-1, 2, 3, and 4 can be independently controlled to open and close.

  Furthermore, the second heat exchanger 430 can switch the strength of the airflow, and the cooling output can be adjusted. Thereby, cooling performance changes and cooling control is possible.

  In the air conditioner 400, based on the image information of the image forming apparatus PR, the airflow passes only through the second ducts 32Y, 32M, 32C, and 32K that cool the developing units 19Y, 19M, 19C, and 19K to be operated from now. In addition, the valves 300-1, 2, 3, and 4 can be controlled to open and close. In parallel with this opening / closing control, by changing the output of the second heat exchanger 430, it is possible to optimize the cooling performance and suppress unnecessary cooling. For example, in monochrome printing, only the black developing unit 19K is driven, so only the valve 300-1 is opened and the other valves are closed.

  In addition, air discharged from the first heat exchanger 420 and heated by the first heat exchanger 420 is fed into the first duct 600 by the airflow generation device 200. Then, it passes through the guide plate 100 located at the end of the first duct 600 and is discharged out of the machine from a discharge port (not shown).

  The air flow discharged from the first duct 600 reuses the hot air discharged from the first heat exchanger 420. As a result, the portion that needs to be heated or ventilated can be ventilated without using wasted power. In the present embodiment, the guide plate 100 is installed in the exit conveyance path of the fixing unit 7 and is exhausted out of the apparatus together with the air in the fixing unit 7. In this process, the inside of the fixing unit 7 can be ventilated with warm air, and condensation of the guide plate 100 can be prevented. In addition, by feeding warm air, the inside of the fixing unit 7 is not actively cooled, and the power consumption of the fixing unit can be suppressed.

  FIG. 3 is a block diagram showing a control configuration for performing airflow control on the guide plate in the present embodiment.

  A control configuration for performing airflow control includes a control unit 800, a temperature sensor 900, a humidity sensor 910, and an airflow generation device 200. The controller 800 receives temperature detection information from the temperature sensor 900 and humidity detection information from the humidity sensor 910. The controller 800 controls the output of the airflow generation device 200 based on the input temperature and humidity detection information. The output of the airflow generation device 200 is the amount of warm air sent to the guide plate 100, and this airflow control corresponds to, for example, the control of the rotational speed of the fan constituting the airflow generation device 200.

  The temperature sensor 900 detects the temperature of the guide plate 100. The humidity sensor 910 is provided near the guide plate 100 and detects the humidity near the guide plate 100. The humidity sensor 910 is provided at three locations in the paper conveyance direction of the guide plate 100 (see FIG. 5B) and at three locations in the direction intersecting the paper conveyance direction. It becomes possible to calculate the saturated water vapor amount of the part from the detection results of the temperature sensor 900 and the humidity sensor 910, and the control unit 800 controls the airflow generation device 200 based on the calculated saturated water vapor amount.

  The control unit 800 includes a CPU and a memory in the circuit. The CPU includes a control unit and a calculation unit. The control unit controls the flow of instruction interpretation and program control, and the calculation unit executes calculation. The program is stored in the memory, and an instruction to be executed (a numerical value or a sequence of numerical values) is taken out from the memory in which the program is placed, and the program is executed.

  FIG. 4 is a flowchart showing a control procedure of airflow control to the guide plate executed by the CPU of the control unit shown in FIG.

  In the figure, when the image forming operation of the image forming apparatus PR is started (step S1), the airflow generation device 200 is turned on and air blowing is started (step S2). Next, the temperature and humidity of the guide plate 100 are detected by the temperature sensor 900 and the humidity sensor 910, and the control unit 800 determines whether or not the amount is equal to or less than the saturated water vapor amount obtained from the relationship between the temperature and humidity (step S3).

  If it is less than the saturated water vapor amount in this determination, it is determined whether or not the image forming operation has been completed (step S4). If the image forming operation has been completed, the air flow generator 200 is turned off, and the processing of this flowchart is performed. The process ends (step S5).

  If the image forming operation has not been completed, the process returns to step S3 to determine whether the amount is equal to or less than the saturated water vapor amount until the image forming operation is completed.

  On the other hand, if it is larger than the saturated water vapor amount in step S3, the output of the airflow generation device 200 is increased (the rotational speed of the fan is increased from the regulation) to increase the air volume (step S6). In this case, even if the outside air is humid, it is possible to reduce the humidity near the guide plate 100 by increasing the air volume.

  Thereafter, the output (air volume) of the airflow generation device 200 is maintained until the saturated water vapor amount or less (step S7: N), and when the saturated water vapor amount or less is reached, the output (air flow) of the airflow generation device 200 is restored (step). S8). Then, the process proceeds to step S4, and the processes after step S3 are repeated until the image forming operation is completed.

  By the above control procedure, the humidity of the guide plate 100 can be lowered, so that the condensation of the fixing unit 7 can be prevented.

  In the above-described embodiment, the output of the airflow generation device 200 is variably controlled. However, the airflow generation device 200 is omitted, and the output of the fan 421 of the first heat exchanger 420 is variable. It is also possible.

  In the present embodiment, the guide plate 100 is described as the guide plate closest to the fixing device 7, but as shown in FIG. The first duct 600 can be provided and controlled in the same manner as in this embodiment.

  Furthermore, in addition to the control of the fan of the airflow generation device 200 or the blower fan 421, the temperature control of the air conditioner is also used in combination, thereby enabling more efficient temperature control.

  FIG. 5 is a diagram showing a modification of the present embodiment. In this modified example, the image forming apparatus PR shown in FIG. 1 is provided in the fixing unit 7 in the fixing unit 7 that is provided on the exit conveyance path from the fixing unit 7. FIG. 5A is a perspective view of the main part of the fixing unit, and FIG. 5B is a sectional view thereof.

  In FIG. 5A, the direction of the arrow D1 is the sheet conveyance direction, and openings 601 are provided on both sides of the unit longitudinal direction of the fixing unit 7 (direction orthogonal to the sheet conveyance direction). And the front-end | tip of the 1st duct 600 extended from the 1st heat exchanger 420 is connected with the opening 601. As shown in FIG. As shown in FIG. 5B, the guide plate 100 is provided along the longitudinal direction of the unit on the downstream side of the heating roller 7a and the pressure roller 7b in the sheet conveying direction, and the sheet is conveyed between the guide plates 100. The The guide plate 100 is disposed within the projected area of the opening 601 in the unit longitudinal direction. Thereby, the airflow from the first duct 600 reaches the guide plate 100, and the humidity near the guide plate 100 can be lowered. And the airflow containing moisture is exhausted from the opening 601 on the back side. In FIG. 5, reference numeral 910 indicates three humidity sensors arranged along the paper transport direction.

  In the present embodiment, an example is shown in which the image forming apparatus PR is air-conditioned by the air-conditioning apparatus 400, but the present invention is also applicable to an apparatus that air-conditions a heat generating part of an electronic device or a heat generating part of a home appliance. Needless to say, it can be applied.

  As described above, according to the present embodiment, the following effects can be obtained.

1) In the present embodiment, in the air conditioner including the first heat exchanger 420 that functions as a condenser and the second heat exchanger 430 that functions as an evaporator, the first heat exchanger 420 is The first duct 600 as a first air flow path for blowing the airflow passing through the guide plate 100 as the first location, and the developing unit as the second location as the airflow passing through the second heat exchanger 430 19Y, M, C, and K, and second ducts 32Y, 32M, 32C, and 32D as second air passages that pass through the second heat exchanger 430 and the cooled airflow. When air is sent from the second ducts 32Y, 32M, 32C, 32K to the developing units 19Y, 19M, C, K, the airflow that has passed through the first heat exchanger 420 is sent from the first duct 600 to the guide plate 100. This
Since the warm airflow that has passed through the first heat exchanger 420 can be sent around the guide plate 100 on the downstream side of the fixing unit 7, it is possible to prevent condensation immediately after fixing. In the cooling operation for cooling the cooling unit in the image forming apparatus PR, the heat of the first heat exchanger (condenser) 420 is used, so that the heating operation is not necessary and extra power is consumed. There is no.
-When used in an electronic device, when a part that needs to be cooled is cooled, a warm air current generated by cooling operation may be blown to a place where condensation may occur. Condensation can be prevented without consuming extra power.
There are effects such as.

2) When the cooled airflow is blown from the second ducts 32Y, 32M, 32C, 32K, which are the second air flow paths, to the developing units 19Y, 19M, C, K, which are the second locations, Since the warm air current is blown from the first duct 600 that is the first blowing path to the guide plate 100 that is the first place where condensation is likely to occur, the occurrence of condensation can be prevented.

3) Since the guide plate 100, which is the first location, is a conveyance path that conveys the sheet immediately after fixing (immediately after passing through the heating roller 7a and the pressure roller 7b), the occurrence of condensation is prevented in the conveyance path immediately after fixing. can do. As a result, there is no adverse effect on the image formed on the paper due to condensation.

4) Since the conveyance path in 3) is located in the fixing unit 7 or on the downstream side of the fixing unit 7 in the sheet conveyance direction, the occurrence of condensation due to moisture evaporation from the sheet after passing through the fixing unit 7 is prevented. be able to.

5) Since the temperature sensor 900 and the humidity sensor 910 for detecting the temperature and humidity of the part are provided in the transport path, the temperature state and the humidity state of the transport path can be grasped.

6) The apparatus further includes a control unit 800 that controls the amount of airflow that is blown through the first duct 600 that is the first air supply path, and the control unit 800 is based on the detection results of the temperature sensor 900 and the humidity sensor 910. Then, the saturated water vapor amount is calculated. Then, the control unit 800 controls the blowing amount based on the calculated saturated water vapor amount and the relative humidity (water vapor amount) at the first location. As a result, it is possible to supply the necessary air volume with the necessary power, and it is possible to suppress unnecessary power consumption.

7) Since the control of the air flow is performed as the rotation control of the fan provided in the first duct 600 or the air fan 421 of the first heat exchanger 420, the air flow can be easily increased. It can be controlled to a predetermined temperature in a short time.

8) The second location includes one of the units that generate heat during image formation, such as a reading device, writing device, photoconductor, and developing device, and uses the warm air current generated when cooling them to prevent condensation Therefore, it is possible to take measures against condensation using an air conditioner without consuming extra power.

  In the claims, the first heat exchanger is denoted by reference numeral 420 in the present embodiment, the second heat exchanger is denoted by reference numeral 430, the first portion is directed to the guide plate 100, and the first air flow path is airflow. In the discharge path (first duct) 600, the second part is in the developing units 19Y, M, C, K, the second blowing path is in the second ducts 32Y, 32M, 32C, 32K, and the air conditioner is 400, the image forming apparatus corresponds to the code PR, the fixing unit corresponds to the code 7, the temperature sensor corresponds to the code 900, the humidity sensor corresponds to the code 910, the control unit corresponds to the code 800, and the blower fan corresponds to the code 421.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention, and all the technical matters included in the technical idea described in the claims are all included. The subject of the present invention. The above embodiment shows a preferable example, but those skilled in the art can realize various alternatives, modifications, variations, and improvements from the contents disclosed in this specification, These are included in the technical scope described in the appended claims.

7 Fixing unit 19Y, M, C, K Developing unit 32Y, M, C, K Second duct 100 Guide plate 400 Air conditioner 420 First heat exchanger 421 Blower fan 430 Second heat exchanger 600 Airflow discharge path (First duct)
800 control unit 900 temperature sensor 910 humidity sensor PR image forming apparatus

JP 2012-073596 A

Claims (9)

A first heat exchanger that functions as a condenser;
A second heat exchanger that functions as an evaporator;
An air conditioner comprising:
A first blowing path for blowing an airflow passing through the first heat exchanger to a first location;
A second air flow path for blowing airflow passing through the second heat exchanger to a second location;
With
When the cooled airflow passes through the second heat exchanger and is blown from the second blowing path to the second location, the airflow that has passed through the first heat exchanger is sent to the first blowing path. An air conditioner that blows air to the first location. An image forming apparatus comprising the air conditioner according to claim 1,
The image forming apparatus according to claim 1, wherein the first portion is a portion where condensation is likely to occur when an airflow cooled from the second air blowing path is blown. The image forming apparatus according to claim 2,
The image forming apparatus, wherein the first portion is a conveyance path for conveying a sheet immediately after fixing. The image forming apparatus according to claim 3, wherein
The image forming apparatus, wherein the transport path is located in the fixing unit or downstream of the fixing unit in the sheet transport direction. The image forming apparatus according to claim 3, wherein:
An image forming apparatus, wherein a temperature detection unit and a humidity detection unit for detecting the temperature and humidity of the part are provided in the conveyance path. The image forming apparatus according to claim 5, wherein
And further comprising a control means for controlling the amount of airflow that is blown through the first airflow path,
The image forming apparatus according to claim 1, wherein the control unit controls the air flow rate based on detection results of the temperature detection unit and the humidity detection unit. The image forming apparatus according to claim 6,
A fan for blowing air in the first air passage;
The image forming apparatus according to claim 1, wherein the control unit controls an air blowing amount of the fan. The image forming apparatus according to claim 7,
The image forming apparatus, wherein the fan is a blower fan provided in the first blower path or a blower fan of the first heat exchanger. The image forming apparatus according to any one of claims 2 to 8,
The image forming apparatus, wherein the second portion is a unit necessary for image formation accompanied by heat generation.

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