JP7374747B2 - HVAC unit - Google Patents

Description

The present invention relates to an HVAC unit with an evaporator within a housing.

For example, construction machines such as excavators and bulldozers are equipped with air conditioners to air condition the inside of the driver's cabin. The evaporator of the refrigerant circuit is installed inside the housing of the HVAC unit that makes up this air conditioner, and is configured to cool the inside of the driver's cabin. Since the evaporator is used in the evaporator, it is easy for the evaporator to malfunction due to the adhesion of dust and dirt.

When there is a problem with the air conditioning system and you want to check the status of the evaporator in the HVAC unit, conventionally there is no other way than to remove the HVAC unit from the construction machine, disassemble the HVAC unit, take out the evaporator, and check the status. There was a problem that there was no method, and maintenance required a large amount of man-hours.

On the other hand, as an attachment structure for an evaporator to an HVAC unit, a structure has been devised in which the evaporator is housed in a cassette or case, and the evaporator is detachably attached to the housing in that state (for example, Patent Document 1 , see Patent Document 2).

Japanese Patent Application Publication No. 2013-10500 Japanese Patent Application Publication No. 2018-203217

According to the configuration described in the above patent document, although the workability when installing the evaporator to the housing is improved, the workability when performing maintenance of the evaporator after it is installed on construction machinery etc. is still improved. There was a lot of room for.

The present invention has been made to solve the conventional technical problems, and an object of the present invention is to provide an HVAC unit that can significantly improve the maintainability of an evaporator provided within a housing.

The HVAC unit of the invention according to claim 1 is arranged under a seat in a driver's cab, and includes a housing and an evaporator provided in the housing, and a wall of the housing located in the front direction of the seat has a housing. , an opening is formed corresponding to the position where the evaporator is provided, and the evaporator can be taken out from inside the housing through the opening toward the front of the seat, and air is blown to the evaporator. an air blower, an air volume control device that is removably attached to the wall of the housing in which an opening is formed and controls the air volume of the blower, and an air volume control device that is formed on the wall of the housing at the location where the air volume control device is installed. The air volume control device is attached to the housing in a manner that blocks the insertion port, and the insertion port is configured to place the evaporator in a position where it can be seen from the outside with the air volume control device removed from the housing. It is characterized by being formed .

The HVAC unit of the invention according to claim 2 is provided with a case that accommodates the evaporator in a manner that allows ventilation to the evaporator and allows the evaporator to be delivered. It is characterized in that it is removably inserted into the housing, is removably attached to the housing, and closes the opening in the attached state.

The HVAC unit of the invention according to claim 3 is characterized in that, in the invention according to claim 2, a handle is formed in the case, and the handle is located outside the housing when it is attached to the housing.

In the HVAC unit of the invention of claim 4, in the invention of claim 2 or 3, the evaporator is provided in the housing in a manner crossing the horizontal direction at an acute angle, and a drainage part is provided at the bottom of the case. is formed, and the drain portion is located above the drain receiving portion formed in the housing when the case is attached to the housing.

In the HVAC unit of the invention according to claim 5, in the invention according to claims 2 to 4 , the case is formed with a pipe connection accommodating part for accommodating the connection part of the refrigerant pipe connected to the evaporator, and the housing In the installed state, the pipe connection housing is located outside the housing, and is characterized in that an expansion valve for reducing the pressure of the refrigerant flowing into the evaporator is housed in the pipe connection housing.

The HVAC unit of the invention according to claim 1 is arranged under a seat in a driver's cab, and includes a housing and an evaporator provided in the housing, and a wall of the housing located in the front direction of the seat has a housing. , an opening is formed corresponding to the position where the evaporator is installed, and the evaporator can be taken out from inside the housing through the opening toward the front of the seat, so that it can be secured inside the driver's cabin. It becomes possible to take out the evaporator from the housing and to attach the evaporator to the housing by utilizing the space under the passenger's feet.

Thereby, even if a problem occurs with the evaporator, the evaporator can be easily removed from the housing and cleaned or replaced without removing the housing and disassembling it. In particular, since it becomes possible to attach and detach the evaporator to the housing inside the operator's cabin, it becomes possible to significantly improve the maintenance workability of the HVAC unit as a whole.

In addition, there is an air blower for blowing air to the evaporator, an air volume control device that is removably attached to the wall of the housing with an opening formed therein, and that controls the air volume of the blower, and a housing where the air volume control device is installed. It further includes an insertion port for an air volume control device formed in the wall, and the air volume control device is attached to the housing in a manner that blocks the insertion port, and the insertion port can be inserted into the evaporator when the air volume control device is removed from the housing. is formed in a position that is visible from the outside, so if a problem occurs with the HVAC unit, the air volume control device can be removed and the evaporator can be installed from the front of the seat in the driver's cabin through the insertion port. You will be able to check the status of This makes it possible to easily determine whether or not a malfunction in the HVAC unit is caused by the evaporator, thereby significantly shortening the time required from identifying the cause of the malfunction to taking countermeasures. In particular, since the status of the evaporator can be checked using the insertion port of the air volume control device, there is no need to form a special window hole in the housing to check the status of the evaporator from the outside. It becomes sexual.

In addition to the above invention, the HVAC unit of the invention of claim 2 is provided with a case that accommodates the evaporator in a state where it can be delivered while allowing ventilation to the evaporator. The evaporator is inserted into and removably into the housing through the opening, and is removably attached to the housing, and the opening is closed in the attached state. The installation work becomes extremely easy. In particular, since the evaporator is housed in a case, it is now possible to protect the evaporator with the case during maintenance work, effectively eliminating the inconvenience of the evaporator being damaged during maintenance work. be able to suppress it.

Furthermore, if the handle is formed on the case as in the third aspect of the invention , and the handle is located outside the housing when attached to the housing, the work of attaching the case to the housing and removing it from the housing can be done easily. It can be easily carried out by holding the handle.

Furthermore, if the evaporator is provided in the housing at an acute angle to the horizontal direction as in the invention of claim 4 , it is possible to reduce the height dimension of the HVAC unit. This is particularly effective when the HVAC unit is placed under the seat in the driver's cab. Furthermore, if a drainage part is formed at the bottom of the case, and this drainage part is positioned above the drain receiver formed in the housing when the case is attached to the housing, the water drips from the evaporator. Drain water can smoothly flow from the drainage part of the case to the drain receiving part of the housing and be discharged.

Further, as in the invention of claim 5 , the case is formed with a pipe connection accommodating part for accommodating the connection part of the refrigerant pipe connected to the evaporator, and when the pipe connection accommodating part is attached to the housing, the pipe connection accommodating part is removed from the housing. If the refrigerant pipe is located at this position, after the case containing the evaporator is attached to the housing, the refrigerant pipe can be easily connected to the connection part in the pipe connection accommodating part outside the housing. The piping connection housing also accommodates an expansion valve for reducing the pressure of the refrigerant flowing into the evaporator, so the expansion valve as well as the evaporator must be attached to the case before assembly into the housing. This will further improve productivity.

In particular, since the expansion valve is also housed within the piping connection accommodating part of the case, the expansion valve can be protected by the case during installation and removal work from the housing, and the expansion valve can be damaged during work. This makes it possible to effectively eliminate or suppress the inconveniences that may occur.

1 is a perspective view illustrating a state in which an HVAC unit according to an embodiment of the present invention is arranged under a seat provided in a driver's cab of a construction machine. 2 is a schematic perspective view of the HVAC unit of FIG. 1. FIG. 3 is a detailed perspective view of the housing of the HVAC unit of FIG. 2; FIG. 2 is a schematic perspective view of the HVAC unit of FIG. 1 with the case removed from the housing; FIG. 5 is a detailed perspective view of the housing and case of the HVAC unit of FIG. 4. FIG. 4 is a plan view of a lower housing member constituting the housing of FIG. 3. FIG. FIG. 7 is a perspective view of the lower housing member of FIG. 6; FIG. 6 is an exploded perspective view of the case and seal member of FIG. 5; FIG. 9 is an exploded perspective view of the case and evaporator of FIG. 8; 10 is a perspective view of only the case of FIG. 9. FIG. FIG. 11 is a top perspective view of the lower case member of the case of FIG. 10; FIG. 12 is a lower perspective view of the lower case member of FIG. 11; FIG. 11 is a bottom perspective view of the upper case member of the case of FIG. 10; FIG. 6 is a plan view of the case of FIG. 5; 15 is a cross-sectional view taken along the line AA in FIG. 14. FIG.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The HVAC (Heating Ventilation and Air Conditioning) unit 1 of the embodiment to which the present invention is applied constitutes an air device (air conditioner) that air-conditions the inside of the operator's cab 2 of the construction machine. It takes in the air inside the driver's cab 2 (inside air) or the air outside the driver's cab 2 (outside air), controls the temperature, and blows it out into the driver's cab 2.

In the following explanation, the components of the air conditioner other than the HVAC unit 1 are not shown, but in reality, the evaporator 3 and expansion valve 4 provided in the HVAC unit 1, and the compressor (not shown) provided outside the operator's cab 2. The engine and the radiator are connected through refrigerant piping to form a well-known refrigerant circuit, thereby cooling and dehumidifying the inside of the driver's cab 2. Further, it is assumed that the HVAC unit 1 is also provided with a heater (not shown) for heating the interior of the driver's cab 2. This heater is composed of an engine heater core, an electric heater (PTC heater), a heating heat exchanger that constitutes a refrigerant circuit of an air conditioner, or the like.

FIG. 1 shows a perspective view of an HVAC unit 1 placed below a seat 6 installed in a driver's cab 2. As shown in FIG. The seat 6 is provided in the driver's cab 2 of a construction machine (not shown), and is a seat for a passenger to sit and operate the construction machine. In the present invention, the HVAC unit 1 is arranged below the seat 6. As shown in FIGS. 2 to 5, the HVAC unit 1 of the present invention includes a horizontally long housing 7, an evaporator 3 attached to the housing 7, an expansion valve 4, the heater, and the evaporator 3 and the heater. It is composed of blowers 8 (two units) and the like for blowing air inside and outside the room 2.

Specifically, as shown in FIG. 3, the housing 7 is composed of a lower housing member 11 (FIGS. 6 and 7) molded from hard synthetic resin or the like, and an upper housing member 12 that is fitted into the lower housing member 11. Both constitute a continuous ventilation passage 16 (FIGS. 6 and 7) that includes an evaporator storage space 13 and a blowout space 14 inside. In this case, the evaporator storage space 13 is configured on the right side of the housing 7 and the left side of the blowout space 14, and an air inlet 17 is formed at the end of the housing 7 on the evaporator storage space 13 side. A blowout port 18 is formed at the end on the side of the blowout space 14 . Note that 19 is a damper provided at each outlet 18, and the above-mentioned heater is arranged in the outlet space 14 on the back side of this damper 19 (downwind side of the evaporator 3).

As shown in FIGS. 6 and 7, the portion of the lower housing member 11 corresponding to the evaporator storage space 13 is sloped low toward the end on the air inlet 17 side to form a drain receiving portion 21. A drainage hole portion 21A is formed at the lowermost portion of the receiving portion 21. A drainage pipe (not shown) is connected to this drainage hole portion 21A from below.

In FIGS. 1, 2, and 4, 22 is a fan case. The two blowers 8 described above are comprised of centrifugal fans in the embodiment, and are installed within the fan case 22. A suction port 23 that communicates with the air suction side of the blower 8 is formed at one end of the fan case 22, and the opposite side of the suction port 23 is opened at two places, and each opening is connected to the air blowing side of each blower 8. It's communicating. The fan case 22 is attached to the housing 7 with the blower 8 attached thereto, with each opening corresponding to each air inlet 17 of the housing 7. Thereby, the air blowing side of the blower 8 communicates with the end of the ventilation passage 16 which is on the opposite side to the blowing outlet 18.

Furthermore, an opening 24 as shown in FIGS. 4 and 5 is formed in the wall 7A of the housing 7 located in the front direction of the seat 6 (the wall facing the passenger's foot space) (in fact, The opening 24 is bordered by the lower housing member 11 and the upper housing member 12). The opening 24 is formed obliquely at an angle close to horizontal, intersecting the horizontal direction at an acute angle. This opening 24 is formed at a position corresponding to the evaporator storage space 13 in which the evaporator 3 is provided.

Further, an air volume control device 26 that controls the air volume of the blower 8 is removably attached to the wall 7A of the housing 7 (FIGS. 2 and 4). This air volume control device 26 is electrically connected to the controller of the air conditioner and controls the air volume of the blower 8, but the air volume control device 26 is installed on the wall 7A at the location where the air volume control device 26 is installed. An insertion port 27 for insertion is formed as an opening (FIGS. 3 and 5).

This insertion port 27 is formed corresponding to the evaporator storage space 13 in the housing 7, and is blocked by the air volume control device 26 when the air volume control device 26 is attached to the housing 7 as shown in FIG. ing. Furthermore, when the air volume control device 26 is removed from the housing 7, the insertion port 27 is opened as shown in FIGS. As shown in FIG. 3, it is configured to be directly visible from the outside.

The evaporator 3 of the embodiment has a rectangular plate shape as a whole, and is equipped with a refrigerant inlet pipe 3A and a refrigerant outlet pipe 3B as shown in FIG. A connecting portion 3C for connecting is provided. Further, the above-mentioned expansion valve 4 for reducing the pressure of the refrigerant flowing into the evaporator 3 is also attached to this connecting portion 3C (FIG. 9). In the present invention, the evaporator 3 is provided in the housing 7 while being housed in a case 28 made of hard resin.

Next, the case 28 will be explained with reference to FIGS. 8 to 15. The overall shape of the case 28 is shown in FIG. This case 28 includes a frame-shaped upper case member 31 (FIG. 13) having dimensions that can accommodate the evaporator 3, and a frame-shaped lower case member 32 (FIG. 11) that removably engages with this upper case member 31. , FIG. 12) and seal members 33A and 33B (FIG. 8).

An upper handle part 34 and an upper pipe connection accommodating part 36 are formed on one side of the frame-shaped upper case member 31, and a plurality of engaged parts 37 are formed in the peripheral part (Fig. 13 , Figure 14). Furthermore, a lower handle portion 38 and a lower pipe connection accommodating portion 39 are formed on one side of the frame-shaped lower case member 32, and a plurality of engaging claws 41 are formed on the periphery (Fig. 11, Figure 15). It is assumed that an opening corresponding to the opening shape of the connecting portion 3C of the evaporator 3 is formed in the lower surface of the lower pipe connection accommodating portion 39 of the lower case member 32, as shown in FIG. Further, as will be described later, a drainage portion 42 is formed in the lower case member 32 at the lowest position when the case 28 is inserted into the housing 7, as shown in FIGS. 12 and 15.

When housing the evaporator 3 in the case 28, the evaporator 3 is placed on the lower case member 32 as shown by the arrow in FIG. into the lower piping connection accommodating part 39. In this state, the upper case member 31 is placed over the lower case member 32 as shown by the arrow in FIG. 9, and the engaging claw 41 is removably engaged with the engaged portion 37. Combine 32.

In this state, the evaporator 3 is housed in the case 28 so as to be delivered while being sandwiched between the upper and lower case members 31 and 32 (FIGS. 14 and 15). At this time, since the upper and lower case members 31 and 32 have a frame shape, the evaporator 3 is housed in the case 28 and can be ventilated from the outside. Further, the upper and lower handle portions 34 and 38 are coupled to each other to constitute a handle portion 43, and the upper and lower pipe connection accommodating portions 36 and 39 are also coupled to each other to constitute a piping connection accommodation portion 44. The refrigerant inlet pipes 3A, 3B, the connecting portion 3C, and the expansion valve 4 are accommodated in this piping connection accommodating portion 44. Note that 46 in FIG. 9 is a screw that detachably fastens the upper and lower case members 31 and 32 at the handle portion 43.

After the evaporator 3 is housed in the case 28 in this manner, a continuous sealing member 33A is attached to the other side and the opposite side perpendicular thereto, as shown in FIG. Moreover, upper and lower flange parts 47 and 48 are formed projecting from one side of the upper and lower case members 31 and 32 at positions on the evaporator 3 side of the upper and lower handle parts 34 and 38. A sealing member 33B is attached around the surface facing the vessel 3 (FIG. 8).

When installing the evaporator 3 in the housing 7, after housing the evaporator 3 in the case 28 as described above and pasting the seal members 33A and 33B, hold the handle 43 as shown by the black arrow in FIG. It is removably inserted into the housing 7 through the opening 24 as shown in FIG. As a result, as shown in FIG. 3, the evaporator 3 is placed in the evaporator storage space of the ventilation passage 16 of the housing 7 in a state that intersects with the horizontal direction at an acute angle, that is, in a diagonally inclined state at an angle close to the horizontal direction. 13.

Note that 49 in FIG. 5 is a screw for removably fastening the case 28 to the housing 7. Further, in this case, since the opening 24 is formed in the wall 7A of the housing 7 located in the front direction of the seat 6, the case 28 can be inserted using the space under the passenger's feet.

When the evaporator 3 is installed in the housing 7 as shown in FIG. 3, the sealing member 33A is in close contact with the inner wall of the housing 7. Further, since the sealing member 33B is in close contact with the outer surface of the wall 7A surrounding the opening 24 of the housing 7, there is substantially no gap between the case 28 and the inner wall of the housing 7 (sealed). ), the opening 24 is also closed (sealed) by the case 28. Further, the drain portion 42 of the case 28 is located above the drain receiving portion 21 of the lower housing member 11 of the housing 7.

Further, the handle portion 43 and the pipe connection accommodating portion 44 are located outside the housing 7. In particular, the lower surface of the pipe connection accommodating portion 44 is approximately horizontal. Then, the refrigerant pipe of the refrigerant circuit is removably connected to the connecting part 3C from below by using the above-mentioned opening on the lower surface of the pipe connection accommodating part 44. When the blower 8 of the HVAC unit 1 in which the evaporator 3 is installed in this way is operated, and the compressor of the refrigerant circuit is operated, air inside and outside the operator's cabin 2 is sucked in through the suction port 23 and into the ventilation passage 16. The refrigerant is ventilated through the evaporator 3 and exchanges heat with the refrigerant that evaporates within the evaporator 3. The air that has passed through the evaporator 3 then passes through the heater described above and is blown out into the driver's cab 2 from the air outlet 18, so that the inside of the driver's cab 2 is air-conditioned.

Moisture in the air (drain water) adhering to the evaporator 3 drips onto the drain receiving portion 21 of the lower housing member 11. Drain water dripping into the drain receiving portion 21 is collected in the drain hole portion 21A, and is discharged to the outside through the drain hole portion 21A.

Here, if a problem occurs in the HVAC unit 1, the air volume control device 26 is first removed from the housing 7. In this state, the insertion port 27 is opened and the evaporator 3 can be viewed from the outside through the insertion port 27 as shown in FIG. 3, so the state of the evaporator 3 can be checked by looking through the insertion port 27. If it is determined that there is a problem with dust or dirt adhering to the evaporator 3, first, after recovering the refrigerant in the refrigerant circuit, the refrigerant pipe is removed from the connection part 3C, and the screws 49 are also removed. Next, the user holds the handle 43 of the case 28 and pulls out the case 28 (evaporator 3) from inside the housing 7 through the opening 24 toward the front of the seat 6 as shown by the white arrow in FIG.

The work of taking out the case 28 (evaporator 3) can also be carried out using the space under the passenger's feet. After that, the seal members 33A and 33B are peeled off and the screws 46 are removed, and then the upper case member 31 is removed from the lower case member 32, and the evaporator 3 is taken out. If the evaporator 3 can be reused only by cleaning, it is housed in the case 28 again after cleaning. If it cannot be reused, a new evaporator 3 is housed in the case 28 and inserted into the housing 7 as described above.

As detailed above, in the present invention, the evaporator 3 is located on the wall 7A of the housing 7 of the HVAC unit 1 located below the seat 6 of the driver's cab 2 in the front direction of the seat 6. Since the opening 24 is formed in the housing 7 and the evaporator 3 can be taken out from inside the housing 7 through the opening 24 toward the front of the seat 6, the space under the feet of the passenger secured in the driver's cab 2 is utilized. Then, it becomes possible to take out the evaporator 3 from the housing 7 and to attach the evaporator 3 to the housing.

As a result, even if a problem occurs with the evaporator 3, the evaporator 3 can be easily removed from the housing 7 for cleaning or replacement without removing the housing 7 from the construction machine or the like and disassembling it. Become. In particular, since it becomes possible to attach and detach the evaporator 3 to the housing 7 inside the operator's cab 2, it becomes possible to significantly improve the maintenance workability of the HVAC unit 1 as a whole.

Further, an insertion port 27 is formed in the wall 7A of the housing 7 at a position where an air volume control device 26 for controlling the air volume of the blower 8 is attached, and the air volume control device 26 is attached to the housing 7 in a manner that blocks the insertion port 27. Since the insertion port 27 is formed in a position where the evaporator 3 can be seen from the outside with the air volume control device 26 removed from the housing 7, if a malfunction occurs in the HVAC unit 1, the air volume control device 26 can be removed. With the evaporator 3 removed, the state of the evaporator 3 can be checked from the front of the seat 6 in the driver's cab 2 through the insertion port 27.

This makes it possible to easily determine whether or not a malfunction in the HVAC unit 1 is caused by the evaporator 3, thereby significantly shortening the time required from identifying the cause of the malfunction to taking countermeasures. Become. In particular, since the state of the evaporator 3 can be checked using the insertion port 27 of the air volume control device 26, there is no need to form a special window hole in the housing to check the state of the evaporator 3 from the outside. This makes it more productive.

Further, a case 28 is provided to accommodate the evaporator 3 in a manner that allows ventilation to be delivered, and the case 28 is inserted into and removed from the housing 7 through the opening 24 with the evaporator 3 accommodated therein. Since the evaporator 3 is inserted freely and detachably attached to the housing 7, and the opening 24 is closed in the attached state, the evaporator 3 is removed from the housing 7 and the evaporator 3 is attached to the housing 7. becomes extremely easy. In particular, since the evaporator 3 is housed within the case 28, the evaporator 3 can be protected by the case 28 during maintenance work, which effectively eliminates the inconvenience of the evaporator 3 being damaged during maintenance work. can be resolved or suppressed.

The case 28 is made up of a frame-shaped upper case member 31, a frame-shaped lower case member 32 that is detachably engaged with the upper case member 31, and a seal member 33A provided at the peripheral edge. The evaporator 3 is accommodated in a manner that it can be delivered with the evaporator 3 sandwiched between the upper and lower case members 31 and 32, and the evaporator 3 is arranged in the housing 7 in the accommodated state and attached to the housing 7, so that the frame The evaporator 3 is mounted on a lower case member 32 having a shape, and the upper case member 31 is also covered with a frame-like upper case member 31, and the upper case member 31 is removably engaged with the lower case member 32. can be housed in the case 28, and the work of housing the evaporator 3 in the case 28 and taking out the evaporator 3 from the case 28 becomes extremely easy.

Further, since the sealing member 33A provided on the peripheral edge of the case 28 comes into close contact with the inner wall surface of the housing 7 when the case 28 is attached to the housing 7, the case 28 containing the evaporator 3 is attached to the housing 7. By simply attaching it, it becomes possible to avoid the inconvenience of the air ventilated into the housing 7 passing through the evaporator 3 without flowing into it, and the workability of assembling the HVAC unit 1 is also extremely improved.

In addition, since the handle part 43 is formed on the case 28 and the handle part 43 is located outside the housing 7 when it is attached to the housing 7, the work of attaching the case 28 to the housing 7 and removing it from the housing 7 is simplified. , can be easily carried out by holding the handle part 43.

In addition, since the evaporator 3 is disposed within the housing 7 so as to intersect with the horizontal direction at an acute angle, it is possible to reduce the height dimension of the HVAC unit 1, and the HVAC unit 1 is This is particularly effective when placed under the seat 6 in the room 2. Furthermore, a drainage part 42 is formed at the lowest part of the case 28, and this drainage part 42 is positioned above the drain receiving part 21 formed in the housing 7 when the case 28 is attached to the housing 7. Therefore, the drain water dripping from the evaporator 3 can smoothly flow from the drain section 42 of the case 28 to the drain receiving section 21 of the housing 7 and be discharged.

In addition, a pipe connection accommodating part 44 for accommodating the connection part 3C of the refrigerant pipe connected to the evaporator 3 is formed in the case 28, and when the pipe connection accommodating part 44 is attached to the housing 7, the pipe connection accommodating part 44 is removed from the housing 7. Therefore, after the case 28 containing the evaporator 3 is attached to the housing 7, the refrigerant pipe can be easily connected to the connection part 3C inside the pipe connection accommodating part 44 outside the housing 7. become able to. In addition, the expansion valve 4 for reducing the pressure of the refrigerant flowing into the evaporator 3 is also accommodated in the pipe connection accommodation section 44, so that the expansion valve 4 is also attached to the case 28 in addition to the evaporator 3. Assembling work to the housing 7 can now be carried out in a single step, thereby further improving productivity.

In particular, since the expansion valve 4 is also accommodated in the pipe connection accommodating portion 44 of the case 28, the expansion valve 4 can be protected by the case 28 during installation and removal from the housing 7. The inconvenience of the expansion valve 4 being damaged during work can also be effectively eliminated or suppressed.

Although the HVAC unit 1 under the seat 6 is shown exposed in FIG. 1, a removable grille is actually provided in the front direction of the HVAC unit 1. Further, instead of the grill, a wall may be provided in front of the HVAC unit 1, a slit may be formed in this wall, and a duct may be provided to connect the HVAC unit 1 and the slit. Furthermore, the space between the HVAC unit 1 and the slit may be covered with packing instead of using such a duct.

Further, the shapes of the housing 7, fan case 22, etc. of the HVAC unit 1 described in the embodiments are not limited thereto, and can be changed without departing from the spirit of the present invention. Further, in the embodiments, the present invention has been explained using construction machinery as an example, but it goes without saying that the present invention is effective not only for agricultural machinery, transportation vehicles, but also for general vehicles.

1 HVAC unit 3 Evaporator 4 Expansion valve 6 Seat 7 Housing 7A Wall 8 Blower 21 Drain receiver 24 Opening 26 Air volume control device 27 Insertion port 28 Case 31 Upper case member 32 Lower case member 33A 33B Seal member 42 Drain section 43 Handle Section 44 Piping connection housing section

Claims (5)

An HVAC unit located under the seat in the driver's cab,
housing and
an evaporator disposed within the housing;
An opening is formed in a wall of the housing located in the front direction of the seat, corresponding to a position where the evaporator is provided,
The evaporator is removable from inside the housing through the opening toward the front of the seat , and
a blower for blowing air to the evaporator;
an air volume control device that is removably attached to the wall of the housing in which the opening is formed, and that controls the air volume of the blower;
further comprising an insertion port for the air volume control device formed in the wall of the housing at a position where the air volume control device is attached;
The air volume control device is attached to the housing in a manner that closes the insertion port, and the insertion port is formed at a position where the evaporator is visible from the outside when the air volume control device is removed from the housing. An HVAC unit characterized by: comprising a case that accommodates the evaporator in a manner that allows ventilation to be delivered to the evaporator;
The case accommodates the evaporator and is removably inserted into the housing through the opening, is removably attached to the housing, and closes the opening in the attached state. 2. The HVAC unit of claim 1. 3. The HVAC unit according to claim 2, wherein a handle is formed in the case, and the handle is located outside the housing when the case is attached to the housing. The evaporator is disposed within the housing at an acute angle to the horizontal direction, and
A drain part is formed at a lowermost part of the case, and the drain part is located above a drain receiving part formed in the housing when the case is attached to the housing. 4. The HVAC unit according to claim 2 or claim 3. A piping connection accommodating part for accommodating a connection part of a refrigerant piping connected to the evaporator is formed in the case, and when the piping connection accommodating part is attached to the housing, the piping connection accommodating part is located outside the housing. At the same time,
5. The HVAC unit according to any one of claims 2 to 4, wherein the pipe connection housing section houses an expansion valve for reducing the pressure of the refrigerant flowing into the evaporator.

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