JP2021094877A - HVAC unit - Google Patents

Abstract

To provide a heating ventilation and air conditioning (HVAC) unit which enables significant improvement of maintainability of an evaporator provided in a housing.SOLUTION: A heating ventilation and air conditioning (HVAC) unit 1 is disposed at the lower side of a seat 6 of a driving cab 2 and includes: a housing 7; and an evaporator provided in the housing 7. An opening is formed corresponding to a position, at which the evaporator is provided, on a wall 7A located in a forward direction of the seat 6 of the housing 7. The evaporator can be taken out from the housing 7 in the forward direction of the seat 6 through the opening in a state that the evaporator is housed in the case 28.SELECTED DRAWING: Figure 1

Description

The present invention relates to an HVAC unit having an evaporator inside the housing.

For example, in construction machines such as excavators and bulldozers, an air conditioner is provided to air-condition the driver's cab. An evaporator of a refrigerant circuit is installed in the housing of the HVAC unit that constitutes this air conditioner so that the cab can be cooled, but under a harsh environment of high vibration and high dust. Since it is used in the above, the evaporator is liable to malfunction due to the adhesion of dust and dirt.

When checking the condition of the evaporator inside the HVAC unit due to a malfunction of the air conditioner, conventionally, after removing the HVAC unit from the construction machine, the HVAC unit is disassembled, and the evaporator is taken out to check the condition. There was a problem that there was no method and a large amount of man-hours were required for maintenance.

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

Japanese Unexamined Patent Publication No. 2013-10500 JP-A-2018-203217

According to the configuration described in the above patent document, the workability when attaching the evaporator to the housing is improved, but the workability when performing maintenance of the evaporator after being attached to a construction machine or the like is still improved. There was a lot of room for it.

The present invention has been made to solve such conventional technical problems, and an object of the present invention is to provide an HVAC unit capable of significantly improving the maintainability of an evaporator provided in a housing.

The HVAC unit of the invention of claim 1 is arranged under the seat of the driver's cab, includes a housing and an evaporator provided in the housing, and is provided on a wall located in the front direction of the seat of the housing. An opening is formed corresponding to a position where the evaporator is provided, and the evaporator is characterized in that it can be taken out from the inside of the housing toward the front of the seat through the opening.

The HVAC unit according to the second aspect of the present invention includes a blower for blowing air to the evaporator in the above invention, an air volume control device that is detachably attached to the wall of a housing having an opening and controls the air volume of the blower. The air volume control device is provided with an insertion port formed on the wall of the housing at the position where the air volume control device is attached. The air volume control device is attached to the housing so as to close the insertion port, and the insertion port is the air volume from the housing. It is characterized in that the evaporator is formed at a position visible from the outside with the control device removed.

In each of the above inventions, the HVAC unit of the invention of claim 3 includes a case in which the evaporator is accommodated in a state where the evaporator can be ventilated, and this case is provided from an opening in a state where the evaporator is accommodated. It is characterized in that it is removably inserted into a housing, detachably attached to the housing, and the opening is closed in the attached state.

The HVAC unit of the invention of claim 4 includes a housing and an evaporator provided in the housing, and includes a case for accommodating the evaporator, and the case includes a frame-shaped upper case member. The evaporator is delivered with the evaporator sandwiched between the upper and lower case members, which consists of a frame-shaped lower case member that engages with the upper case member in a detachable manner and a seal member provided on the peripheral edge. It is characterized in that it is possibly housed, placed in a housing in a housed state, attached to the housing, and in the mounted state the sealing member is in close contact with the inner surface of the wall of the housing.

The HVAC unit according to the fifth aspect of the present invention includes an opening formed corresponding to the wall of the housing at the position where the evaporator is provided in the above invention, and the case is inside the housing from the opening in a state where the evaporator is housed. It is characterized in that it is removably inserted into and detachably attached to the housing, and the opening is closed in the attached state.

The HVAC unit according to the sixth aspect of the present invention is characterized in that, in the third to fifth aspects of the invention, a handle portion is formed in the case, and the handle portion is located outside the housing in a state of being attached to the housing. And.

In the HVAC unit of the invention of claim 7, in the invention of claims 3 to 6, the evaporator is provided in the housing so as to intersect at an acute angle with respect to the horizontal direction, and a drainage portion is provided at the bottom of the case. Is formed, and the drainage portion is located above the drain receiving portion formed in the housing in a state where the case is attached to the housing.

In the HVAC unit of the invention of claim 8, in the invention of claims 3 to 7, a pipe connection accommodating portion accommodating the connection portion of the refrigerant pipe connected to the evaporator is formed in the case, and the housing is formed with the pipe connection accommodating portion. In the attached state, the pipe connection accommodating portion is located outside the housing, and the pipe connection accommodating portion is characterized in that an expansion valve for reducing the pressure of the refrigerant flowing into the evaporator is accommodated.

The HVAC unit of the invention of claim 1 is arranged under the seat in the driver's cab, includes a housing and an evaporator provided in the housing, and is provided on a wall located in the front direction of the seat of the housing. , An opening is formed corresponding to the position where the evaporator is provided, and the evaporator can be taken out from the inside of the housing toward the front of the seat through the opening, so that the evaporator is secured in the driver's cab. The space under the passenger's feet can be used to remove the evaporator from the housing and attach the evaporator to the housing.

As a result, even if a problem occurs in the evaporator, the evaporator can be easily removed from the housing and cleaned or replaced without removing the housing and disassembling the housing. In particular, since the work of attaching and detaching the evaporator to and from the housing can be performed in the driver's cab, the maintenance workability of the HVAC unit can be remarkably improved as a whole.

Further, in addition to the above invention, the HVAC unit of the invention of claim 2 is detachably attached to a blower for blowing air to the evaporator and a wall of a housing having an opening, and an air volume for controlling the air volume of the blower. It is equipped with a control device and an insertion port for the air volume control device formed on the wall of the housing 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 Since the evaporator is formed in a position where it can be seen from the outside with the air volume control device removed from the housing, if a problem occurs in the HVAC unit, the air volume control device is removed from the cab. It becomes possible to check the state of the evaporator from the front direction of the seat through the insertion port. As a result, it becomes possible to easily determine whether or not the defect of the HVAC unit is caused by the evaporator, so that the time required from the identification of the cause of the defect to the countermeasure can be remarkably shortened. In particular, since the state 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 or the like in the housing for checking the state of the evaporator from the outside, and production is possible. It will be rich in sex.

Further, in addition to the above inventions, the HVAC unit of the invention of claim 3 includes a case in which the evaporator is accommodated in a state where the evaporator can be ventilated, and this case includes a state in which the evaporator is accommodated. It is removably inserted into the housing from the opening, and is detachably attached to the housing, and the opening is closed in the attached state. Therefore, the evaporator is taken out from the housing and the evaporator is attached to the housing. The work of installing is extremely easy. In particular, since the evaporator is housed in the case, the evaporator can be protected by the case during maintenance work, and the inconvenience that the evaporator is damaged during the work can be effectively eliminated or. It will be possible to suppress it.

The HVAC unit of the invention of claim 4 includes a housing and an evaporator provided in the housing, and includes a case for accommodating the evaporator, and the case includes a frame-shaped upper case member. The evaporator is delivered with the evaporator sandwiched between the upper and lower case members, which consists of a frame-shaped lower case member that engages with the upper case member in a detachable manner and a seal member provided on the peripheral edge. Since it can be accommodated, placed in the housing in the accommodated state, and attached to the housing, the work of removing the evaporator from the housing and attaching the evaporator to the housing becomes extremely easy. In this case, since the evaporator is housed in the case, the evaporator can be protected by the case during installation and removal work, and the inconvenience that the evaporator is damaged during the work is effectively eliminated. Or, it becomes possible to suppress it.

In particular, the evaporator is placed on the frame-shaped lower case member, which is also covered with the frame-shaped upper case member, and the upper case member is engaged with the lower case member in a detachable manner so that the evaporator can be mounted inside the case. Since it can be accommodated in the case, it becomes extremely easy to accommodate the evaporator in the case and to take out the evaporator from the case.

Further, since the sealing member provided on the peripheral edge of the case is in close contact with the inner surface of the wall of the housing when the case is attached to the housing, ventilation is provided inside the housing simply by attaching the case containing the evaporator to the housing. It becomes possible to avoid the inconvenience that the air to be passed through the evaporator without flowing into the evaporator, and the assembly workability of the HVAC unit becomes extremely good.

Further, the HVAC unit of the invention of claim 5 is provided with an opening formed corresponding to the wall of the housing at a position where the evaporator is provided in addition to the above invention, and the case is opened in a state of accommodating the evaporator. It is removably inserted into the housing from the part, and it is detachably attached to the housing, and the opening is closed in the attached state, so the work of attaching and removing the case containing the evaporator to the housing. The performance is further improved, and the productivity and maintenance workability can be improved.

Further, if the handle portion is formed in the case as in the invention of claim 6 and the handle portion is located outside the housing in a state of being attached to the housing, the work of attaching the case to the housing and removing it from the housing can be performed. You will be able to easily hold the handle.

Further, if the evaporator is provided in the housing so as to intersect the horizontal direction at a sharp angle as in the invention of claim 7, the dimension of the HVAC unit in the height direction can be reduced. This is especially effective when the HVAC unit is placed under the seat in the driver's cab. Further, if a drainage portion is formed at the bottom of the case and the drainage portion is located above the drain receiving portion formed in the housing with the case attached to the housing, the water drops from the evaporator. Drain water can be smoothly drained from the drainage part of the case to the drainage receiving part of the housing.

Further, as in the invention of claim 8, a pipe connection accommodating portion for accommodating the connection portion of the refrigerant pipe connected to the evaporator is formed in the case, and the pipe connection accommodating portion is outside the housing in a state of being attached to the housing. If it is positioned, the refrigerant pipe can be easily connected to the connection portion in the pipe connection accommodating portion outside the housing after the case containing the evaporator is attached to the housing. Further, since the expansion valve for reducing the pressure of the refrigerant flowing into the evaporator is also accommodated in the pipe connection accommodating portion, the expansion valve is also attached to the case in addition to the evaporator, and the assembly work is performed on the housing. You will be able to do this, and your productivity will be further improved.

In particular, since the expansion valve is also housed in the pipe connection accommodating part of the case, the expansion valve can be protected by the case when it is attached to or removed from the housing, and the expansion valve is damaged during the work. The inconvenience caused by this can be effectively eliminated or suppressed.

It is a perspective view explaining the state in which the HVAC unit of one embodiment to which this invention is applied is arranged under the seat provided in the driver's cab of a construction machine. It is a schematic perspective view of the HVAC unit of FIG. It is a detailed perspective view of the housing of the HVAC unit of FIG. It is a schematic perspective view of the HVAC unit of FIG. 1 in a state where the case is removed from the housing. It is a detailed perspective view of the housing and the case of the HVAC unit of FIG. It is a top view of the lower housing member which constitutes the housing of FIG. It is a perspective view of the lower housing member of FIG. FIG. 5 is an exploded perspective view of the case and the seal member of FIG. It is an exploded perspective view of the case and an evaporator of FIG. It is a perspective view of only the case of FIG. It is an upper perspective view of the lower case member of the case of FIG. It is a lower perspective view of the lower case member of FIG. It is a lower perspective view of the upper case member of the case of FIG. It is a top view of the case of FIG. FIG. 14 is a cross-sectional view taken along the line AA of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to 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) for air-conditioning the inside of the cab 2 of the construction machine, and is inside the cab 2 of the construction machine. It is installed and takes in the air inside the cab 2 (inside air) or the air outside the cab 2 (outside air), regulates the temperature, and blows it out into the cab 2.

Although the components of the air conditioner other than the HVAC unit 1 are not shown in the following description, the evaporator 3 and the expansion valve 4 provided in the HVAC unit 1 and the compressor (not shown) provided outside the cab 2 are actually not shown. A machine and a radiator are connected by a refrigerant pipe to form a well-known refrigerant circuit to cool and dehumidify the inside of the cab 2. Further, it is assumed that the HVAC unit 1 is also provided with a heater (not shown) for heating the inside of the cab 2. This heater is composed of a heater core of an engine, an electric heater (PTC heater), a heat exchanger for heating that constitutes a refrigerant circuit of an air conditioner, and the like.

FIG. 1 shows a perspective view showing a state in which the HVAC unit 1 is arranged under the seat 6 installed in the driver's cab 2. The seat 6 is provided in the driver's cab 2 of the construction machine (not shown), and is a seat for the passenger to sit down 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 operates on a horizontally long housing 7, an evaporator 3, an expansion valve 4, the heater, and the evaporator 3 and the heater attached to the housing 7. It is composed of blowers 8 (2 units) for blowing air inside and outside the room 2.

The housing 7 is composed of a lower housing member 11 (FIGS. 6 and 7) molded from a hard synthetic resin or the like and an upper housing member 12 fitted to the lower housing member 11 in detail as shown in FIG. Both form a continuous ventilation passage 16 (FIGS. 6 and 7) including 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 on 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. , An outlet 18 is formed at the end on the outlet space 14 side. Reference numeral 19 denotes a damper provided at each outlet 18, and the heater described above is assumed to be arranged in the outlet space 14 (leeward side of the evaporator 3) on the back side of the damper 19.

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

In FIGS. 1, 2, and 4, reference numeral 22 denotes a fan case. The two blowers 8 described above are made of a centrifugal fan in the embodiment, and are mounted in the fan case 22. A suction port 23 communicating 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 on the air blow side of each blower 8. Communicating. The fan case 22 is attached to the housing 7 with the blower 8 attached, and each opening corresponds to each air inlet 17 of the housing 7. As a result, the air blowing side of the blower 8 communicates with the end of the ventilation passage 16 which is opposite to the air outlet 18.

Further, an opening 24 as shown in FIGS. 4 and 5 is formed in the wall 7A (the wall facing the space under the feet of the passenger) of the housing 7 located in the front direction of the seat 6 (actually). Is bordered by the lower housing member 11 and the upper housing member 12 to form the opening 24). The openings 24 intersect with each other at an acute angle with respect to the horizontal direction, and are formed diagonally at an angle close to horizontal. The 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 for controlling the air volume of the blower 8 is detachably attached to the wall 7A of the housing 7 (FIGS. 2 and 4). The air volume control device 26 is electrically connected to the controller of the air conditioner to control the air volume of the blower 8. The air volume control device 26 is mounted on the wall 7A at the position where the air volume control device 26 is attached. An insertion port 27 for insertion is formed (FIGS. 3 and 5).

The insertion port 27 is formed corresponding to the evaporator storage space 13 in the housing 7, and is closed 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. Further, when the air volume control device 26 is removed from the housing 7, the insertion port 27 is opened as shown in FIGS. 3 and 5, and the state of the evaporator 3 provided in the housing 7 via the insertion port 27 is changed. As shown in FIG. 3, it is configured so that it can be directly viewed from the outside.

The evaporator 3 of the embodiment has a rectangular plate shape as a whole, and includes a refrigerant inlet pipe 3A and a refrigerant outlet pipe 3B as shown in FIG. 9, and a refrigerant pipe is connected to the evaporator 3 at their ends. A connecting portion 3C for connecting the above 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 the connection portion 3C (FIG. 9). Then, in the present invention, the evaporator 3 is provided in the housing 7 in a state of being housed in the case 28 made of hard resin.

Next, the case 28 will be described with reference to FIGS. 8 to 15. The overall shape of the case 28 is shown in FIG. The case 28 has a frame-shaped upper case member 31 (FIG. 13) having a size capable of accommodating the evaporator 3 and a frame-shaped lower case member 32 (FIG. 11) that engages with the upper case member 31 in a detachable manner. , FIG. 12) and the seal members 33A and 33B (FIG. 8).

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

When the evaporator 3 is housed in the case 28, the evaporator 3 is placed on the lower case member 32 as shown by an arrow in FIG. 9, and the refrigerant inlet pipes 3A and 3B, the connection portion 3C and the expansion valve 4 are placed. Is inserted into the lower pipe connection accommodating portion 39. In that state, as shown by the arrow in FIG. 9, the upper case member 31 is placed on the lower case member 32, and the engaging claw 41 is engaged with the engaged portion 37 so as to be engaged and disengaged. 32 are combined.

In this state, the evaporator 3 is housed in the case 28 in a state of 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 connected to each other to form the handle portion 43, and the upper and lower pipe connection accommodating portions 36 and 39 are also connected to each other to form the pipe connection accommodating portion 44. Then, the refrigerant inlet pipes 3A and 3B, the connection portion 3C and the expansion valve 4 are accommodated in the pipe 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 with the handle portion 43.

After the evaporator 3 is housed in the case 28 in this way, a continuous sealing member 33A is attached to the other side and the side orthogonal to the other side and facing each other as shown in FIG. Further, on one side of the upper and lower case members 31 and 32, upper and lower flange portions 47 and 48 are formed so as to be on the evaporator 3 side of the upper and lower handle portions 34 and 38, and the flange portions 47 and 48 are evaporated. A seal member 33B is attached around the surface on the side of the vessel 3 (FIG. 8).

When the evaporator 3 is provided in the housing 7, the evaporator 3 is housed in the case 28 as described above, the seal members 33A and 33B are attached, and then the handle portion 43 is held and shown by the black arrow in FIG. As described above, it is freely inserted into and detached from the opening 24 into the housing 7. As a result, as shown in FIG. 3, the evaporator 3 intersects the horizontal direction at an acute angle, that is, the evaporator storage space of the ventilation passage 16 of the housing 7 is inclined at an angle close to horizontal. It is arranged in 13.

Reference numeral 49 in FIG. 5 is a screw for detachably 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 insertion work of the case 28 can be performed by utilizing the space under the passenger's feet.

With the evaporator 3 provided in the housing 7 as shown in FIG. 3, the sealing member 33A comes into close contact with the inner surface of the wall of the housing 7. Further, since the sealing member 33B is in close contact with the outer surface of the wall 7A around the opening 24 of the housing 7, there is substantially no gap (sealed) between the case 28 and the inner surface of the wall of the housing 7. ), The opening 24 is also closed (sealed) by the case 28. Further, the drainage 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 substantially horizontal. Then, using the above-mentioned opening on the lower surface of the pipe connection accommodating portion 44, the refrigerant pipe of the refrigerant circuit is detachably connected to the connection portion 3C from below. When the blower 8 of the HVAC unit 1 in which the evaporator 3 is installed is operated in this way and the compressor of the refrigerant circuit is operated, the air inside and outside the cab 2 is sucked from the suction port 23, and the inside of the ventilation passage 16 It is ventilated to the evaporator 3 of the above and exchanges heat with the refrigerant that evaporates in 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 cab 2 from the outlet 18, so that the inside of the cab 2 is air-conditioned.

Moisture (drain water) in the air adhering to the evaporator 3 is dropped onto the drain receiving portion 21 of the lower housing member 11. The drain water dropped on the drain receiving portion 21 is collected in the drain hole portion 21A and discharged to the outside from the drain hole portion 21A.

Here, if a problem occurs in the HVAC unit 1, first, the air volume control device 26 is removed from the housing 7. In this state, the insertion port 27 is opened, and the evaporator 3 can be visually recognized from the outside as shown in FIG. 3 from the insertion port 27. Therefore, the state of the evaporator 3 is confirmed by looking into the insertion port 27. When it is identified that the evaporator 3 has a problem of dust or dirt adhering to the evaporator 3, first, the refrigerant of the refrigerant circuit is recovered, the refrigerant pipe is removed from the connection portion 3C, and the screw 49 is also removed. Next, the case 28 (evaporator 3) is pulled out from inside the housing 7 through the opening 24 in the front direction of the seat 6 as shown by the white arrow in FIG. 5 by holding the handle portion 43 of the case 28.

The work of taking out the case 28 (evaporator 3) can also be performed using the space under the passenger's feet. Then, after peeling off the seal members 33A and 33B and removing the screws 46, 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 described in detail above, in the present invention, the evaporator 3 is provided on the wall 7A located in the front direction of the seat 6 of the housing 7 of the HVAC unit 1 arranged under the seat 6 of the driver's cab 2. Since the opening 24 is formed and the evaporator 3 can be taken out from the inside of the housing 7 in the front direction of the seat 6 through the opening 24, the space under the passenger's feet secured in the driver's cab 2 is used. Then, the evaporator 3 can be taken out from the housing 7 and the evaporator 3 can be attached to the housing.

As a result, even if a problem occurs in 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 the work of attaching and detaching the evaporator 3 to and from the housing 7 can be performed in the driver's cab 2, the maintenance workability of the HVAC unit 1 can be remarkably improved as a whole.

Further, an insertion port 27 is formed on the wall 7A of the housing 7 at a position where the 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 so as to close the insertion port 27. The insertion port 27 is formed at a position where the evaporator 3 can be seen from the outside with the air volume control device 26 removed from the housing 7. Therefore, if a problem occurs in the HVAC unit 1, the air volume control device 26 The state of the evaporator 3 can be confirmed from the front direction of the seat 6 through the insertion port 27 in the driver's cab 2 with the above removed.

As a result, it becomes possible to easily determine whether or not the defect of the HVAC unit 1 is caused by the evaporator 3, so that the time required from the identification of the cause of the defect to the countermeasure can be remarkably shortened. Become. In particular, since the state of the evaporator 3 can be confirmed by using the insertion port 27 of the air volume control device 26, it is also necessary to form a special window hole in the housing for confirming the state of the evaporator 3 from the outside. It will be highly productive.

Further, a case 28 for accommodating the evaporator 3 in a state where the evaporator 3 can be ventilated is provided, and the case 28 is inserted into and removed from the opening 24 in the state where the evaporator 3 is accommodated. Since the evaporator 3 is freely inserted and detachably attached to the housing 7 and the opening 24 is closed in the attached state, the evaporator 3 is taken out from the housing 7 and the evaporator 3 is attached to the housing 7. Is extremely easy. In particular, since the evaporator 3 is housed in the case 28, the evaporator 3 can be protected by the case 28 during maintenance work, and the inconvenience that the evaporator 3 is damaged during the work is also effective. It will be possible to eliminate or suppress it.

Further, the case 28 is composed of a frame-shaped upper case member 31, a frame-shaped lower case member 32 that engages with the upper case member 31 in a detachable manner, and a seal member 33A provided on the peripheral edge portion. The evaporator 3 was accommodated in a state where the evaporator 3 was sandwiched between the upper and lower case members 31 and 32 so as to be able to be delivered, and the evaporator 3 was arranged in the housing 7 in the accommodated state and attached to the housing 7. The evaporator 3 is placed on the shaped lower case member 32, which is also covered with the frame-shaped upper case member 31 and the upper case member 31 is engaged with the lower case member 32 in a disengaged manner. Can be housed in the case 28, and the work of accommodating the evaporator 3 in the case 28 and taking out the evaporator 3 from the case 28 becomes extremely easy.

Further, since the seal member 33A provided on the peripheral edge of the case 28 is in close contact with the inner surface of the wall of the housing 7 in a state where the case 28 is attached to the housing 7, the case 28 containing the evaporator 3 is attached to the housing 7. Just by attaching it, it becomes possible to avoid the inconvenience that the air ventilated in the housing 7 passes through the evaporator 3 without flowing into the evaporator 3, and the assembly workability of the HVAC unit 1 becomes extremely good.

Further, since the handle portion 43 is formed on the case 28 and the handle portion 43 is located outside the housing 7 while being attached to the housing 7, the case 28 is attached to the housing 7 and removed from the housing 7. , The handle portion 43 can be easily held.

Further, since the evaporator 3 is provided in the housing 7 at an acute angle with respect to the horizontal direction, the dimension of the HVAC unit 1 in the height direction can be reduced, and the HVAC unit 1 operates. It is particularly effective when it is arranged under the seat 6 of the room 2. Further, a drainage portion 42 is formed at the lowermost portion of the case 28 so that the drainage portion 42 is located above the drain receiving portion 21 formed in the housing 7 with the case 28 attached to the housing 7. Therefore, the drain water dripping from the evaporator 3 can be smoothly flowed from the drainage portion 42 of the case 28 to the drain receiving portion 21 of the housing 7 and discharged.

Further, a pipe connection accommodating portion 44 for accommodating the connection portion 3C of the refrigerant pipe connected to the evaporator 3 is formed in the case 28, and the pipe connection accommodating portion 44 is outside the housing 7 in a state of being attached to the housing 7. Since the case 28 in which the evaporator 3 is housed is attached to the housing 7, the refrigerant pipe can be easily connected to the connection part 3C in the pipe connection housing part 44 outside the housing 7. become able to. Further, since the expansion valve 4 for reducing the pressure of the refrigerant flowing into the evaporator 3 is also accommodated in the pipe connection accommodating portion 44, the expansion valve 4 is attached to the case 28 in addition to the evaporator 3. It becomes possible to perform the assembling work to the housing 7 and the productivity is further improved.

In particular, since the expansion valve 4 is also housed in the pipe connection accommodating portion 44 of the case 28, the expansion valve 4 can be protected by the case 28 when it is attached to or removed from the housing 7. The inconvenience that the expansion valve 4 is damaged during the work can be effectively eliminated or suppressed.

Although the HVAC unit 1 under the seat 6 is shown to be exposed in FIG. 1, a detachable grill 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 the wall, and a duct connecting the HVAC unit 1 and the slit may be provided. Further, the space between the HVAC unit 1 and the slit may be covered with packing without using such a duct.

Further, the shapes of the housing 7 and the fan case 22 of the HVAC unit 1 described in the examples are not limited thereto, and can be changed without departing from the spirit of the present invention. Further, in the examples, the present invention has been described by taking a construction machine as an example, but it goes without saying that the present invention is also effective not only for agricultural machines, transportation vehicles, or 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 part 43 Handle Part 44 Piping connection accommodating part

Claims (8)

An HVAC unit located under the driver's seat,
With the housing
The housing is provided with an evaporator provided in the housing.
An opening is formed in the wall of the housing located in the front direction of the seat so as to correspond to the position where the evaporator is provided.
The HVAC unit is characterized in that the evaporator can be taken out from the inside of the housing in the front direction of the seat through the opening. A blower for blowing air to the evaporator and
An air volume control device that is detachably attached to the wall of the housing in which the opening is formed and controls the air volume of the blower.
It is provided with an insertion port for the air volume control device formed on 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 so as to close the insertion port, and the air volume control device is attached to the housing.
The HVAC unit according to claim 1, wherein the insertion port is formed at a position where the evaporator can be visually recognized from the outside in a state where the air volume control device is removed from the housing. Provided with a case for accommodating the evaporator in a state where the evaporator can be ventilated so that the evaporator can be delivered.
The case is removably inserted into the housing through the opening while accommodating the evaporator, and is detachably attached to the housing, and the opening is closed in the attached state. The HVAC unit according to claim 1 or 2. An HVAC unit including a housing and an evaporator provided in the housing.
A case for accommodating the evaporator is provided.
The case is
Frame-shaped upper case member and
A frame-shaped lower case member that engages with the upper case member in a detachable manner,
It consists of a sealing member provided on the peripheral edge.
The evaporator is accommodated so as to be able to be delivered with the evaporator sandwiched between the upper and lower case members, and the evaporator is placed in the housing in the accommodated state, attached to the housing, and the seal in the attached state. An HVAC unit characterized in that the member is in close contact with the inner surface of the wall of the housing. It has an opening formed corresponding to the wall of the housing at the position where the evaporator is provided.
The case is removably inserted into the housing through the opening while accommodating the evaporator, and is detachably attached to the housing, and the opening is closed in the attached state. The HVAC unit according to claim 4, wherein the HVAC unit is characterized. The method according to any one of claims 3 to 5, wherein a handle portion is formed in the case, and the handle portion is located outside the housing in a state of being attached to the housing. HVAC unit. The evaporator is provided in the housing so as to intersect at an acute angle with respect to the horizontal direction, and the evaporator is provided in the housing.
A claim is characterized in that a drainage portion is formed at the lowermost portion of the case, and the drainage portion is located above a drain receiving portion formed in the housing in a state where the case is attached to the housing. The HVAC unit according to any one of 3 to 6. The case is formed with a pipe connection accommodating portion for accommodating a connection portion of a refrigerant pipe connected to the evaporator, and the pipe connection accommodating portion is located outside the housing in a state of being attached to the housing. And at the same time
The HVAC unit according to any one of claims 3 to 7, wherein an expansion valve for reducing the pressure of the refrigerant flowing into the evaporator is accommodated in the pipe connection accommodating portion.

Images