JP2001171328A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize 'head cooling and foot heating' control to keep room temperature comfortable by supplying cold air and warm air from different blowoff ports. SOLUTION: In this air conditioner, a casing 12 of an air conditioning unit 11 comprises a unit case 14 having an air intake port 13, and a changeover box 15. The unit case 14 is provided with a blower 18, an evaporator 19 and a heater core 20 or the like, while air conditioning dampers 22, 23 are turnably provided before and behind the heater core 20. The changeover box 15 is formed as a short box-like body, while one end side of the changeover box 15 is connected to a conditioned air takeout port 14A of the unit case 14 through a seal member 16. A changeover damper 25 is provided inside the changeover box 15. The changeover damper 25 approaches the takeout port 14A of the unit case 14 when the changeover damper 25 turns to an intermediate position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner which is provided in a construction machine such as a hydraulic shovel and is preferably used for adjusting a temperature in a cab.

[0002]

2. Description of the Related Art In general, construction machines such as hydraulic shovels are equipped with an air conditioner for improving the comfort in the cab, and this air conditioner can adjust the temperature in the cab according to the operator's preference. (For example, JP-A-7-186693).

A conventional air conditioner of this type is provided, for example, in a driver's cab at a position behind a driver's seat or the like. One end of the air conditioner serves as an inlet for inside air or outside air, and the other end of the air conditioner sends a plurality of cool air or warm air. A casing serving as an outlet, a blower provided in the casing and configured to blow air sucked from the inlet toward the plurality of outlets, and provided in the casing positioned between the blower and the outlet. And a switching damper which is provided in the casing and located downstream of the cooler and the heater and selectively opens and closes the plurality of outlets.

When an operator seated in the driver's seat operates an air conditioner switch or the like to cool, for example, the operator's cab, the airflow generated in the casing by the blower is cooled by a cooler, and the operator's cab is opened through the outlet of the casing. Supply cold air to Further, at the time of heating, the air flow in the casing is warmed by the heater, so that warm air is supplied from the outlet to the cab.

In this case, the switching damper provided on the outlet side of the casing closes the lower outlet and opens the upper outlet, for example, to allow cool air to flow downward from the upper side of the cab during cooling. Cool air is supplied into the cab from the upper outlet. During heating, the switching damper closes the upper outlet and opens the lower outlet to supply warm air from the lower side into the cab and efficiently circulate warm air in the cab using natural convection. Things.

Further, a temperature adjusting damper is provided in the casing of the air conditioner, for example, located between the cooler and the heater. The temperature adjusting damper is provided with a cool air amount by the cooler and a warm air by the heater. The temperature of the air (conditioned air) supplied from the outlet to the cab is adjusted by variably adjusting the amount of air.

[0007]

In the above-described conventional air conditioner, the temperature of the conditioned air supplied into the cab can be variably adjusted because the temperature adjusting damper is provided in the casing. It is. However, the air temperature in the driver's cab is not always uniform, for example, between the upper layer side and the lower layer side, and the operator feels that the lower side of the body is too hot and the upper side (head) side is too warm even though it is cold. In such a case, there is a problem that it is difficult to maintain the temperature in the cab in an appropriate temperature control state.

Further, since a switching damper for selectively opening and closing a plurality of outlets is provided on the downstream side of the casing, it is possible to switch the blowing direction of the conditioned air by the switching damper. However, since the temperature in the cab cannot be adjusted only by switching the air blowing direction of the conditioned air, the operator needs to frequently rotate the temperature adjustment damper and the air blowing direction switching damper, thereby increasing the burden on the operator. There is a problem of doing.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to blow air flows having different temperatures from first and second outlets.
For example, cool air can be supplied to the upper body of the operator and warm air can be supplied to the lower body of the operator, so-called “head cold foot heat” control can be realized, and the indoor temperature can be maintained at an appropriate temperature control state. An object of the present invention is to provide an air conditioner capable of surely reducing a load.

[0010]

In order to solve the above-mentioned problems, the invention of claim 1 has an air inlet at one end and a first and a second air outlet for sending cool air or warm air to the other end. And a casing provided with the air outlet of the first and second air inlets.
A blower that blows air toward the outlet of the blower, a cooler that is provided in the casing and that is located downstream of the blower and that cools air flowing in the casing to generate cool air, and a downstream side of the cooler. And a heater provided in the casing and warming the air flowing through the casing to generate warm air.

A feature of the structure adopted by the first aspect of the present invention is that, during cooling, the amount of intake air on the heater side is reduced to allow the cool air from the cooler to flow downstream, and to flow to the heater side during heating. Temperature adjustment that controls the amount of intake air flowing to the heater side to an intermediate air amount when the warm air flows to the downstream side by increasing the amount of intake air and is adjusted to an intermediate temperature between the time of cooling and the time of heating. Means, provided in the casing at a position downstream of the temperature adjusting means, wherein when the temperature adjusting means controls the intake air amount on the heater side to an intermediate air amount, the cool air from the cooler and the heater And a diversion control unit that diverts the warm air from the first air outlet, guides the cool air to the first air outlet side, and guides the warm air to the second air outlet side.

With this configuration, when the temperature adjustment control means controls the intake air amount flowing to the heater side to the intermediate intake air amount by the temperature adjustment control means for adjusting the temperature to the intermediate temperature between the cooling operation and the heating operation, The control means can divide and control the cool air from the cooler and the warm air from the heater. In this state, the cool air is led to the first outlet side and the warm air is led to the second outlet side. Can be realized.

According to the second aspect of the present invention, the temperature adjusting means is rotatably provided between the outflow side of the cooler and the inflow side of the heater. A first temperature control damper that adjusts the amount of intake air flowing through the heater in accordance with the opening, and the amount of warm air flowing out of the heater that is rotatably provided on the outflow side of the heater according to the opening. A second temperature control damper for adjusting the
The second temperature control damper is configured to rotate to an intermediate opening position when adjusting the air temperature to the intermediate temperature.

In this way, during cooling, the first and second temperature control dampers are both turned to the heater side to reduce the amount of intake air passing through the heater and to allow the cool air from the cooler to flow downstream as it is. Can be. During heating, the first and second
By rotating both the temperature control dampers in a direction away from the heater, the amount of intake air flowing to the heater side can be increased, and the warm air generated by the heater can be circulated downstream. When the temperature is adjusted to an intermediate temperature between the time of cooling and the time of heating, both the first and second temperature control dampers are rotated to the intermediate opening position, and the intake air amount flowing to the heater side is adjusted to the intermediate air amount. Can be controlled.

According to the third aspect of the present invention, the flow dividing control means is provided between the first outlet and the second outlet so as to be rotatable in the casing, and the first rotary is provided. In the position, the first outlet is opened and the second outlet is closed, and in the second pivot position, the second outlet is opened and the first outlet is closed, and the first pivot position is opened. When the rotary damper is rotated to an intermediate position between the second rotation position and the second rotation position, the switching damper guides the warm air flowing out of the heater to the second air outlet side and the cool air from the cooler to the first air outlet side. Make up.

Thus, when the switching damper is rotated to an intermediate position between the first rotating position and the second rotating position, the warm air flowing out of the heater and the cool air flowing from the cooler are transferred to the tip of the switching damper. Side, the warm air can be guided to the second outlet side, and the cool air from the cooler can be diverted to the first outlet side.
Can be guided to the exit.

According to the fourth aspect of the present invention, the casing houses a blower, a cooler, and a heater therein, and has a unit case having an air inlet at one end and a conditioned air outlet at the other end. The inlet side is connected to the conditioned air outlet side of the unit case, and the outlet side of the conditioned air includes a substantially T-shaped outlet switching box having first and second outlets. The inflow port of the conditioned air is provided in the outlet switching box so as to switch between the first outlet and the second outlet.

With this arrangement, the switching damper provided in the substantially T-shaped delivery port switching box can divide the inlet side of the delivery port switching box into two when rotated to the intermediate position. , The cold air and the warm air can be divided and controlled.

Further, according to the fifth aspect of the present invention, the cooler is disposed in the middle of the air passage in the casing, and the heater closes a part of the air passage located downstream of the cooler in the casing. And the remaining portion of the air passage corresponding to the heater is opened as a cool air passage.

Thus, at the position downstream of the cooler, the air passage in the casing can be divided into a warm air passage on the heater side and a remaining cool air passage.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air conditioner according to an embodiment of the present invention will be described in detail with reference to FIGS.

In the figure, 1 is a lower traveling body of a hydraulic shovel, 2
Denotes an upper revolving structure that is rotatably mounted on the lower traveling structure 1. The upper revolving structure 2 forms a vehicle body of a construction machine together with the lower traveling structure 1. The upper revolving unit 2 has a frame 3 (hereinafter, referred to as a revolving frame 3). On the revolving frame 3, a cab 4 defining an operator's cab, and a cab 4 A building cover 5 accommodating a prime mover and the like, and a counterweight 6 and the like located behind the building cover 5 are provided.

Reference numeral 7 denotes a working device provided at the front of the upper revolving unit 2. The working device 7 includes a boom 7A provided at the front of the revolving frame 3 so as to be able to move up and down, and a tip of the boom 7A. The arm 7B is roughly constituted by an arm 7B provided so as to be able to move up and down, and a bucket 7C provided rotatably at the distal end side of the arm 7B. The working device 7 excavates earth and sand on the tip side of the bucket 7C by rotating the bucket 7C while raising and lowering the boom 7A and the arm 7B.

Next, 8 is a driver's seat provided in the cab 4 as shown in FIG. 2, and 9 is an operation console (only one is shown) arranged on both the left and right sides of the driver's seat 8. The driver's seat 8 and the console 9 are installed on the floor plate 4A of the cab 4 so as to be adjustable. Then, the operator seated in the driver's seat 8 operates the working device 7 and the like by tilting the operation levers 9A provided on the left and right consoles 9.

A cab 4 is located behind the driver's seat 8.
The rear cover 10 is formed as a decorative cover made of, for example, a resin material. The rear cover 10 is connected to an air conditioning unit 11 described later.
And the like from the upper side to protect the air conditioning unit 11 and to improve the aesthetics in the cab 4 behind the driver's seat 8.

Reference numeral 11 denotes a cab 4 located behind the driver's seat 8.
The air-conditioning unit 11 is an air-conditioning unit that constitutes an air-conditioning device provided in the inside.
And a blower 1 described later provided in the casing 12.
8, an evaporator 19, a heater core 20, and the like.

The casing 1 of the air conditioning unit 11
2 is a rectangular cylindrical unit case 14 provided with an air inlet 13 at one end thereof opening upward, the other end serving as a conditioned air outlet 14A and extending in the left and right directions; And an outlet switching box 15 (hereinafter, referred to as a switching box 15) provided on the side of the outlet 14A. The outlet 14A of the unit case 14 is a connection port to the switching box 15.

Here, the switching box 15 is formed as a short box having a substantially T-shape. One end of the switching box 15 is connected to an outlet 14A of the unit case 14 via a sealing member 16 to flow the conditioned air. The entrance is 15A. Also,
On the other end side of the switching box 15, upper and lower outlets 15B, 1B are opened in a direction substantially perpendicular to the inlet 15A.
5C, and the outlets 15B and 15C are provided with first and second outlets.
This constitutes a delivery port for The switching box 15 is provided with a later-described switching damper 25 on the side of the wall surface 15D facing the inlet 15A, and the upper and lower outlets 15B, 1B.
5C is opened and closed by the switching damper 25.

On the other hand, an inside / outside air switching box (not shown) is provided at one end side of the unit case 14 above the air intake 13, and the inside / outside air switching box (not shown) is provided through the inside / outside air switching box. The outside air is indicated by arrow A in FIG.
The air is sucked from the air intake 13 in the direction.

Reference numeral 17 denotes a branch box provided on the upper side of the switching box 15. The lower side of the branch box 17 is shown in FIG.
Is connected to the outlet 15B of the switching box 15 as shown in FIG. The branch box 17 is provided with front and rear openings 17A (only the front side is shown) as shown in FIG.
A front extension duct 27 and an upper extension duct 28 described later are connected to each of the openings 17A.

Reference numeral 18 denotes a blower provided in the unit case 14 below the air inlet 13.
Is composed of an electric motor 18A mounted on the lower surface side of the unit case 14 as shown in FIG. 4, and a blower fan 18B driven to rotate by the electric motor 18A. The blower 18 sucks inside air or outside air from the air inlet 13 by the rotation of the blower fan 18B, and forcibly blows this air into an air passage 21 described later in the direction of arrow A.

Reference numeral 19 denotes an evaporator as a cooler provided in the unit case 14 and located downstream of the blower fan 18B.
The unit case 14 is disposed over the entire height (full width) of the unit case 14 so as to close an air passage 21 described later.

The evaporator 19 constitutes a part of a cooling device, and cools intake air flowing in the unit case 14 in the direction of arrow A by driving, for example, a refrigerant compressor (not shown). This is to generate cool air in the air passage 21 of the casing 12. In addition, evaporator 1
9 has a dehumidifying function, so that the evaporator 19 is often operated, for example, even during a heating operation described later.

A heater core 20 is located downstream of the evaporator 19 and is provided in the unit case 14 as a heater. The heater core 20 constitutes a part of a heating device. It flows into the heater core 20 through a valve (not shown). Thus, the heater core 20 warms the intake air flowing in the unit case 14 in the direction indicated by the arrow A, and generates warm air in the casing 12.

Here, in the unit case 14, a portion downstream of the blower fan 18B is an air passage 21. The air passage 21 is located at the position of the heater core 20 and has a cool air passage 21A as a first air passage and a second air passage 21A. And a warm air passage 21B as an air passage.

That is, the lower surface of the heater core 20 is fixed to the unit case 14, the upper end of the heater core 20 extends to an intermediate height position of the unit case 14, and is arranged so as to close a part of the air passage 21. A heater core 20 and a temperature control damper 2 to be described later are provided on the downstream side of the unit case 14.
4 and 6, a cold air passage 21A through which cool air flows in the direction of arrow A1 as shown in FIGS. 4 and 6, and a warm air passage 21B through which warm air flows in the direction of arrow A2 as shown in FIGS. They are formed to be branched from each other.

Reference numeral 22 denotes an evaporator 19 and a heater core 20.
And a first temperature control damper provided in the unit case 14 to open and close the cold air passage 21A between
The first temperature control damper 22 is composed of a plate-shaped valve or the like, and is attached to a corner at the upper end of the heater core 20 via a support shaft 22A so as to be rotatable in a direction indicated by an arrow in FIG. The first temperature control damper 22 constitutes a temperature control means together with a second temperature control damper 23 described later, and controls the amount of intake air flowing through the cool air passage 21A and the warm air passage 21B according to the opening degree. It is.

Reference numeral 23 denotes a unit case which is located on the outflow side of the heater core 20 so as to open and close the warm air passage 21B.
A second temperature control damper provided in the
4 also includes a plate-shaped valve or the like, and is attached to a lower corner of the heater core 20 via a support shaft 23A so as to be rotatable in a direction indicated by an arrow in FIG. And the temperature control dampers 22 and 23
Are driven in conjunction with each other by a temperature control actuator 24 shown in FIG. 7, and are rotationally controlled between a cooling position indicated by a solid line in FIG. 4 and a heating position indicated by a two-dot chain line. Note that the temperature control actuator 24 is configured by an electric motor or the like.

Here, when the temperature control dampers 22 and 23 are rotated to the cooling position indicated by the solid line in FIG.
2 closes the inflow side of the heater core 20 and the temperature control damper 23
Closes the outflow side of the heater core 20. As a result, the air in the unit case 14 is kept in a cool
1A, flows only in the direction indicated by the arrow A1.
The intake air amount flowing through the 0 (warm air passage 21B) side is reduced to substantially zero.

When the temperature control dampers 22 and 23 are turned to the heating position as shown in FIG. 5, the temperature control damper 22 opens the inflow side of the heater core 20 to substantially close the cold air passage 21A side, and The adjustment damper 23 fully opens the outflow side of the heater core 20 to allow air to flow through the warm air passage 21B. As a result, the air in the unit case 14 becomes warm in the warm air passage 21B and flows only in the direction indicated by the arrow A2, so that the amount of intake air flowing through the heater core 20 is greatly increased.

On the other hand, when the temperature control dampers 22 and 23 are rotated to an intermediate position between the cooling position and the heating position as shown in FIG. 6, the cool air passing through the evaporator 19 is cooled.
A and the warm air passage 21B are divided into two parts.
Sets the outlet side of the heater core 20 to a half-open state. As a result, in the unit case 14, the cool air flows in the direction of the arrow A1 in the cool air passage 21A, and the warm air flows in the direction of the arrow A2 in the warm air passage 21B.

Reference numeral 25 denotes a switching damper provided in the switching box 15 as a flow dividing control means.
Reference numeral 5 denotes a plate-shaped valve or the like,
It is attached to 5D via a support shaft 25A so as to be rotatable upward and downward. The leading end of the switching damper 25 extends into the inlet 15A of the switching box 15, and the outlet 15A is switched so that the inlet 15A is switched to the outlets 15B and 15C.
B and 15C are selectively opened and closed. The switching damper 25 is driven by a wind direction actuator 26 shown in FIG. 7, and the wind direction actuator 26 is configured by an electric motor or the like.

Here, the switching damper 25 fully opens the outlet 15B and closes the outlet 15C at the lower position as the first rotation position shown in FIG. As a result, the conditioned air is guided upward in the switching box 15 in the direction of arrow B. In addition, in the upper position as the second rotation position indicated by the solid line in FIG. 5, the switching damper 25 closes the outlet 15B,
The outlet 15C is fully opened. In this case, the conditioned air is guided downward in the switching box 15 in the direction of arrow C toward the below-described duct 29.

On the other hand, when the switching damper 25 is rotated to an intermediate position between the upper position and the lower position as shown in FIG.
4A, the inlet 15A of the switching box 15 is divided into approximately two parts. For example, the cool air flowing in the direction of arrow A1 and the warm air flowing in the direction of arrow A2 are moved upward.
Divide it down. Thus, the switching damper 25 guides the cool air toward the outlet 15B in the direction of arrow B and the warm air toward the outlet 15C in the direction of arrow C at the intermediate position.

Reference numeral 27 denotes a front extending duct connected to the opening 17A of the branch box 17. The front extending duct 27 extends inside the cab 4 toward the front of the driver's seat 8 as shown in FIG. Are bent upward along the front side of the cab 4. An outlet 27A for cool air or warm air (conditioned air) is provided at the tip end of the forward duct 27, and the air outlet 27A blows conditioned air into the cab 4 in the direction of arrow B1. In addition, the blowout port 27A has a function of removing fogging of the front glass or the like by sending conditioned air to the front glass (not shown) of the cab 4, for example.

Reference numeral 28 denotes an upper duct connected to the branch box 17 at a position opposite to the front duct 27, and the upper duct 28 faces upward to the rear of the branch box 17 as shown in FIG. An outlet box 28A is provided at the upper end of the outlet box 28A so as to extend in a left and right direction. And
A plurality of outlets 28 are provided on the upper surface side of the outlet box 28A.
Are formed, and each of the outlets 28B is provided with a louver or the like for adjusting an air blowing direction.

Here, the blowing box 2 of the upper duct 28
As shown in FIG. 2, 8 </ b> A protrudes upward from the rear end side of the rear cover 10 and is disposed close to the rear surface of the cab 4. The blowout box 28A blows conditioned air in the direction of arrow B2 along the rear surface of the cab 4, and circulates the conditioned air in the cab 4 from above to below in the direction of arrow B3. Note that the conditioned air in the direction of arrow B1 blown out from the outlet 27A of the front extension duct 27 also
It circulates in the cab 4 from above to below in the direction of arrow B3.

Reference numeral 29 denotes a lower duct connected to the outlet 15C of the switching box 15, and the lower duct 29 is provided in FIG.
As shown in FIG. 3, the inside of the rear cover 10 extends downward of the air conditioning unit 11, bends substantially in an L shape along the floor plate 4 </ b> A of the cab 4, and further extends inside the cab 4 toward the front side of the driver's seat 8. ing. The distal end of the lower duct 29 is an outlet 29A that opens diagonally upward at the front position of the driver's seat 8, and the outlet 29A directs conditioned air toward the lower part (foot) of the operator in the direction of arrow C1. It has a configuration to blow out.

Next, reference numeral 30 denotes a fan switch provided on the console 9 and the like in the cab 4 for controlling the operation and stop of the blower 18, and 31 denotes an air conditioner switch as an air conditioning switch provided on the console 9 and the like in the cab 4. The air conditioner switch 31 is connected to an input side of a controller 34 to be described later as shown in FIG.
It outputs a command signal for stopping.

Reference numeral 32 denotes a temperature control switch for controlling the temperature of the conditioned air. The temperature control switch 32 is also provided on the console 9 or the like in the cab 4 and is manually operated by an operator. The temperature control switch 32 is selectively operated to any one of switching positions such as "cooling", "heating", "intermediate temperature", and "blowing" as shown in FIGS.

Reference numeral 33 denotes a wind direction selection switch for selecting the wind direction of the conditioned air. The wind direction selection switch 33 is provided on the upper surface of the console 9 at a position close to the temperature control switch 32 and is manually operated by an operator. . And
The wind direction selection switch 33 is connected to the cab 4 from the air conditioning unit 11.
As shown in FIG. 8, the wind direction of the conditioned air supplied inward is selected as "automatic wind direction" or "automatic release" which is manual switching.

Here, the wind direction selection switch 33 allows the user to select the wind direction "B", "C" or the like as shown in FIG. 9 at the "automatic release" position where manual switching is performed. In response to the control signal, the switching damper 25 is rotated to the lower position illustrated in FIG. 4 to blow the conditioned air upward in the direction of arrow B. As a result, the conditioned air from the air conditioning unit 11 is supplied to the outlet 27 of the forward duct 27.
A is supplied in the direction of arrow B1 in FIG. 2 from A, and is supplied in the direction of arrow B2 from the blowing box 28A of the upper extension duct 28.

When the wind direction "C" is selected by the wind direction selection switch 33, the switching damper 25 is turned to the upper position illustrated in FIG. And blow it down. Thereby, the conditioned air from the air conditioning unit 11 flows from the outlet 29A of the lower duct 29 through the arrow C1 in FIG.
Supplied in the direction. On the other hand, when the switching damper 25 is rotated to the intermediate position illustrated in FIG. 6 by a signal from the wind direction selection switch 33, the conditioned air flows upward and downward in the cab 4 in directions indicated by arrows B and C. It is supplied.

Reference numeral 34 denotes a controller constituted by a microcomputer or the like.
Is the fan switch 30 and the air conditioner switch 3 on the input side
1, connected to a temperature control switch 32, a wind direction selection switch 33, etc., the output side of which is a blower 18, a temperature control actuator 2
4 and the wind direction actuator 26 and the like.
The controller 34 stores programs and the like shown in FIGS. 8 and 9 in a storage unit 34A including a ROM, a RAM, and the like, and performs an air conditioning control process and the like by the air conditioning unit 11.

Here, the controller 34 constitutes a temperature adjusting means together with the first and second temperature adjusting dampers 22 and 23 and the temperature adjusting actuator 24, and controls the temperature adjusting dampers 22 and 23 according to a command signal from the temperature adjusting switch 32. The rotation is selectively controlled to a cooling position shown in FIG. 4, a heating position shown in FIG. 5, or an intermediate position shown in FIG.

The controller 34 is provided with the switching damper 25.
When the intermediate temperature is selected in step 10 in FIG. 8 and the wind direction is selected as “automatic” by the wind direction selection switch 33 in step 12 as shown in FIG. As shown in FIG. 6, the rotation of the switching damper 25 is controlled to the intermediate position. As a result, the air flow in the air conditioning unit 11 is divided into cold air in the direction indicated by arrow A1 and warm air in the direction indicated by arrow A2, and the divided cold air is guided to the outlet 15B in the direction indicated by arrow B, and the warm air is discharged into the outlet. It is guided in the direction of arrow C to the 15C side.

The air conditioner for a hydraulic shovel according to the present embodiment has the above-described configuration.
When the operator seated on the driver's seat 8 in the vehicle tilts the operation lever 9A or the like, the vehicle is moved forward or backward, or the work device 7 is operated to excavate earth and sand.

When the temperature inside the cab 4 rises or falls due to a change in the outside air temperature, the operator operates the fan switch 30 and the air conditioner switch 31 to start the air conditioning unit 11 and the controller 34 controls the air conditioning. The control process is executed according to the programs shown in FIGS.

That is, when the processing operation is started, it is determined in step 1 whether or not the "cooling" operation is selected by the temperature control switch 32. If "YES" is determined, the process proceeds to step 2 and the temperature control damper is operated. The rotation of the wheels 22 and 23 is controlled to the cooling position indicated by the solid line in FIG. Thus, the intake air flowing in the air passage 21 of the unit case 14 in the direction indicated by the arrow A flows only in the direction indicated by the arrow A1 through the cool air passage 21A while being cooled by the evaporator 19.

Then, in step 3, it is determined whether or not the wind direction is selected to be "automatic" by the wind direction selection switch 33. If "YES" is determined, the wind direction control suitable for the cooling operation is performed. Move to switch damper 2
5 is rotated to the lower position shown by the solid line in FIG. 4, and the cool air flowing from the cool air passage 21A in the direction of arrow A1 is guided to the outlet 15B side of the switching box 15 in the direction of arrow B.

As a result, the cool air from the air conditioning unit 11 flows from the outlet 27A of the forward duct 27 through the arrow B1 in FIG.
To the cab 4 in the direction
8 is supplied from the blowing box 28A in the direction of arrow B2. As shown in FIG. 2, the cold air collides with each other on the upper side of the driver's seat 8 and circulates in the cab 4 from above to below in the direction indicated by the arrow B3, and efficiently removes the air inside the cab 4. Cool down.

If "NO" is determined in step 3, the wind direction selection switch 33 has been switched to the "automatic release" position, so that the process proceeds to step 18 shown in FIG. 9 and the wind direction "C" is selected. Is determined, "YES"
When the determination is made, the process proceeds to step 19, in which the switching damper 25 is rotated to the upper position shown by the dashed line in FIG. 4, and the cool air is blown downward toward the outlet 15C. Thereby, the cool air from the air conditioning unit 11 is supplied from the outlet 29A of the lower duct 29 into the cab 4 in the direction of arrow C1 in FIG.

On the other hand, if "NO" is determined in the step 18, it can be determined that the intermediate wind direction has been selected by the wind direction selection switch 33. Therefore, the process proceeds to the step 20, and the switching damper 25 is set to a two-dot chain line in FIG. Then, the rotation is controlled to the intermediate position exemplified in (1), and the process returns in step S21. Thereby, the cool air as conditioned air is blown toward the outlets 15B and 15C of the switching box 15 in the directions indicated by arrows B and C, and the outlet 27A of the front extension duct 27 and the upper extension duct 2
8 and the outlet 29A of the lower duct 29.
, Cool air is supplied into the cab 4.

Next, when it is determined "NO" in step 1 in FIG.
Is switched to “heating” operation.
Then, when it is determined “YES” in step 6,
In step 7, the temperature control dampers 22 and 23 are rotated to the heating position as shown in FIG. 5, and the temperature control damper 22 opens the inflow side of the heater core 20 to close the cool air passage 21A. The outflow side of the heater core 20 is fully opened.

As a result, the intake air in the unit case 14 is heated by the heater core 20, becomes warm air, and flows through the warm air passage 21B only in the direction of arrow A2. Then, in the next step 8, it is determined whether the wind direction is "automatic",
When the determination is "YES", the flow proceeds to step 9 to perform the wind direction control suitable for the heating operation, and the switching damper 25 is rotated to the upper position shown by the solid line in FIG.
Switch the hot air flowing in the direction of arrow A2 from the switching box 15
To the outlet 15C side in the direction of arrow C, and return in step 5.

In this case, the warm air from the air conditioning unit 11 is supplied from the outlet 29A of the downwardly extending duct 29 toward the operator's feet in the direction of arrow C1 in FIG.
Thus, warm air is blown from the lower side of the body of the operator in the cab 4, and the operator is comfortably warmed from the foot side.

If "NO" is determined in step 8, the wind direction selection switch 33 has been switched to the "automatic release" position, so that the flow proceeds to step 16 shown in FIG. 9 and the wind direction "B" is selected. Is determined, "YES"
When the determination is made, the process proceeds to step 17, in which the switching damper 25 is rotated to the lower position indicated by the dashed line in FIG. 5, and the warm air is blown upward toward the outlet 15B. Thereby, the warm air from the air conditioning unit 11 can be supplied from the outlet 27A of the front extending duct 27 in the direction of arrow B1 in FIG.
Can be supplied in any direction.

Next, when it is determined "NO" in step 6 in FIG.
It is determined whether or not 2 has been switched to the "intermediate temperature". If "YES" is determined in step 10, the process proceeds to step 11, and the temperature control dampers 22, 23 are rotated to the intermediate position as shown in FIG.

Then, in this case, the cool air that has passed through the evaporator 19 is cooled by the temperature control damper 22 into the cool air passage 21A.
The temperature control damper 23 sets the outlet side of the heater core 20 to a half-open state.
Thereby, the cool air passage 21 in the unit case 14 is formed.
Cool air flows in the direction A in the direction of arrow A1, and warm air flows in the direction of arrow A2 in the direction of the warm air passage 21B.

Then, in the next step 12, it is determined whether or not the wind direction is "automatic". If the determination is "YES", so-called "head cold foot heat" control is executed.
Then, the switching damper 25 is rotated to the intermediate position shown in FIG.

As a result, the air flow in the air conditioning unit 11 is divided into cold air in the direction of arrow A1 and warm air in the direction of arrow A2, and the split cold air is guided to the outlet 15B in the direction of arrow B. At the same time, the warm air is guided in the direction of arrow C to the outlet 15C side. Then, the cold air flows into the forward duct 27.
2 is supplied into the cab 4 in the direction shown by arrow B1 in FIG. 2, and is supplied from the blowout box 28A of the upper extension duct 28 in the direction shown by arrow B2. And circulate in the cab 4 from above to below in the direction of arrow B3.

The warm air from the air conditioning unit 11 is supplied from the outlet 29A of the downward duct 29 toward the operator's feet in the direction indicated by the arrow C1 in FIG. Can be supplied. As a result, the interior of the cab 4 is adjusted to a comfortable room temperature state of “head cold foot heat” in which cool air is supplied to the upper side of the operator's body and warm air is supplied to the lower side.

On the other hand, if "NO" is determined in step 12, the wind direction selection switch 33 has been switched to the "automatic release" position, so the flow proceeds to step 16 shown in FIG. 9 and the wind direction "B" is selected. Is determined, and “YE
S, the process proceeds to step 17 and the switching damper 25 is rotated to the lower position as illustrated in FIG.
The air is blown upward toward the outlet 15B while mixing the cool air and the warm air.

As a result, the conditioned air from the air conditioning unit 11 has an intermediate temperature between the cold air and the warm air,
7 is supplied in the direction of arrow B1 in FIG. 2 from the outlet 27A of FIG.
It will be supplied in two directions.

If "NO" is determined in the step 16, the process proceeds to a step 18 to determine whether or not the wind direction "C" is selected. Then, in step 18, "YE
When the determination is "S", the process proceeds to step 19, in which the switching damper 25 is rotated to the upper position as illustrated in FIG.
The air is blown downward to the outlet 15C side while mixing the cool air and the warm air. Thereby, the conditioned air from the air conditioning unit 11 has an intermediate temperature between the cool air and the warm air, and is supplied from the outlet 29A of the lower duct 29 in the direction of arrow C1 in FIG.

Next, if "NO" is determined in step 10, the process proceeds to step 14 in FIG. 9 to determine whether or not the air conditioner switch 31 has been switched to "OFF" together with the fan switch 30. If it is determined, the process proceeds to step 22 and returns. Step 14
Is determined to be "NO", for example, the air conditioner switch 31 is turned "OFF" and the fan switch 30 is turned "O".
It is determined that the state has been switched to only the blower control in the “N” state, and the blower control by the blower 18 is executed in step 15.

In this case, the refrigerant compressor and the like of the cooling device are stopped, the cooling of the air by the evaporator 19 is interrupted, and the temperature control dampers 22 and 23 are rotated to the positions shown by solid lines in FIG. The heating of the air by the heater core 20 is also interrupted. Then, in the next step 16, it is determined whether or not the wind direction “B” is selected by the wind direction selection switch 33, and if “YES” is determined, the switching damper 25 is moved to the lower direction shown by a solid line in FIG. It rotates to the side position, and blows air upward to the outlet 15B side.

If "NO" is determined in the step 16, the process proceeds to a step 18, and the wind direction selecting switch 33
It is determined whether or not the wind direction “C” is selected.
If "YES" is determined in the step 18, the switching damper 25 is rotated to an upper position indicated by a dashed line in FIG. 4 in a step 19, and the air is blown downward in the direction of arrow C.

Further, if "NO" is determined in step 18, it can be determined that the intermediate wind direction has been selected by the wind direction selection switch 33. Therefore, the process proceeds to step 20, and the switching damper 25 is indicated by a two-dot chain line in FIG. The rotation is controlled to the illustrated intermediate position, whereby the blowing air can be circulated in the directions indicated by arrows B and C toward the outlets 15B and 15C of the switching box 15, respectively.

Thus, in the present embodiment, the casing 12 of the air conditioning unit 11 is made up of the unit case 14 provided with the blower 18, the evaporator 19, the heater core 20, and the like, and the conditioned air outlet of the unit case 14. A switching box 15 connected to the side of the unit case 14 and extending to a position approaching the outlet 14A side of the unit case 14 when rotated to an intermediate position. Is provided, the following operation and effect can be obtained.

That is, in order for the operator to set the temperature inside the cab 4 to an intermediate temperature between the time of cooling and the time of heating, the operator switches the temperature control switch 32 to the "intermediate temperature" and sets the wind direction selection switch 33 to the "automatic" position. , The temperature control dampers 22, 23 are rotated to the intermediate position as shown in FIG.
The switching damper 25 is also automatically rotated to the intermediate position.

For this reason, the cool air that has passed through the evaporator 19 of the air conditioning unit 11 is divided into two by the temperature control dampers 22 and 23 into the cool air passage 21A side and the warm air passage 21B side. To the warm air passage 21B side in the direction of arrow A2.

When the switching damper 25 is rotated to the intermediate position, the cooling air in the direction indicated by the arrow A1 and the warm air in the direction indicated by the arrow A2 can be reliably divided in the switching box 15, and the divided cold air is discharged to the outlet 15B. In addition to being drawn out in the direction of arrow B, the warm air can be drawn out in the direction of arrow C toward the outlet 15C.

As a result, in the cab 4 of the hydraulic excavator, the arrow B in FIG.
Cool air can be supplied to the upper part of the operator's body in one direction, and cool air can also be supplied from the blow-out box 28A of the upper duct 28 in the direction of arrow B2, and these cool air collide with each other above the driver's seat 8. Then, the cool air can be circulated in the cab 4 from above to below in the direction of arrow B3.

At this time, the warm air from the air conditioning unit 11 is blown out from the outlet 29A of the downwardly extending duct 29 toward the operator's feet in the direction indicated by the arrow C1 in FIG. Can supply warm air. Therefore, in the cab 4, it is possible to supply cold air to the upper part of the body of the operator and to supply warm air to the lower part of the body.

Therefore, according to the present embodiment, the upper and lower outlets 1 provided in the switching box 15 of the air conditioning unit 11 are provided.
It is possible to blow air flows having different temperatures from 5B and 15C, so that so-called “head cold foot heat” control can be realized, and the temperature inside the cab 4 can be maintained in an appropriate temperature control state.

In order to comfortably adjust the temperature inside the cab 4, the operator does not need to frequently switch the temperature control switch 32 and the wind direction selection switch 33 as described in the related art, for example. The burden on the operator can be reliably reduced, and the livability in the cab 4 can be improved.

In the above embodiment, when the air conditioning temperature is set to the intermediate temperature, the temperature control dampers 22, 23 are rotated to the intermediate position shown in FIG. 6, but the present invention is not limited to this. The present invention is not limited to this. For example, the rotation positions of the temperature control dampers 22 and 23 may be changed or adjusted appropriately according to the set temperature or the like.

In the above embodiment, the case where the air conditioning unit 11 is provided in the cab 4 of the hydraulic shovel has been described as an example. However, the present invention is not limited to this, and other construction such as a hydraulic crane may be used. The present invention may be applied to an air conditioner of a machine, a truck, a bus, a passenger car, or the like.

[0090]

As described in detail above, according to the first aspect of the present invention, the casing is provided with temperature adjusting means for adjusting the temperature of the conditioned air, and the amount of intake air flowing to the heater side by the temperature adjusting means. At the downstream side of the temperature adjusting means, and a shunt control means for shunting the cool air by the cooler and the warm air by the heater, so that the temperature of the conditioned air is controlled by the temperature adjusting means during cooling and during heating. When the intake air amount flowing to the heater side is controlled to an intermediate air amount in order to adjust to the intermediate temperature, the cool air by the cooler and the warm air by the heater can be divided by the division control means,
In this state, the "cool head heat" control can be realized by introducing cool air to the first outlet side and warm air to the second outlet side. Then, the work of adjusting the room temperature or the like to an appropriate temperature can be simplified, and the burden on the operator or the like can be reduced.

According to the second aspect of the present invention, the first temperature control damper rotatably provided between the outflow side of the cooler and the inflow side of the heater, and Since the second temperature control damper is rotatably provided on the outflow side of the heater, the first and second temperature control dampers are used when adjusting the temperature between cooling and heating. By rotating both to the intermediate opening position, the intake air amount flowing to the heater side can be controlled to the intermediate air amount, and the cool air and the warm air are divided into two and circulated to the downstream side of the casing. Can be.

According to the third aspect of the present invention, the flow dividing control means is constituted by a switching damper which is located between the first outlet and the second outlet and is rotatably provided in the casing. The switching damper opens a first outlet in a first rotation position and closes a second outlet, and opens a second outlet and closes the first outlet in a second rotation position. At the same time, when the air is rotated to an intermediate position between the first rotation position and the second rotation position, the cool air from the cooler is guided to the first air outlet side and the warm air flowing out of the heater is sent to the second air outlet. Because it is configured to be guided to the outlet side, the warm air flowing out of the heater and the cool air from the cooler can be divided by the tip side of the switching damper,
The cool air from the cooler can be blown to the outside from the first outlet side, and the warm air can be blown to the outside from the second outlet side.

According to the invention described in claim 4, the casing houses a blower, a cooler, and a heater therein, and has a unit case having one end serving as an air inlet and the other end serving as a conditioned air outlet, A substantially T-shaped outlet switching box provided with an inlet side of the conditioned air connected to an outlet side of the unit case and a switching damper for opening and closing the first and second outlets on the outlet side of the conditioned air; When the switching damper provided in the outlet switching box is rotated to the intermediate position, the switching damper is extended so as to be divided into two on the inlet side of the outlet switching box. The leading end side can satisfactorily divide cold air and warm air.

Further, according to the invention of claim 5,
The cooler is disposed in the middle of the air passage in the casing, the heater is disposed to close a part of the air passage in the casing, and the remaining portion of the air passage corresponding to the heater is provided with the cool air passage. Since the air passage in the casing can be divided into a warm air passage on the heater side and a remaining cool air passage at a position downstream of the cooler, the cool air and the warm air can be divided into two and flow downstream. Can be.

[Brief description of the drawings]

FIG. 1 is an overall view showing a hydraulic shovel to which an air conditioner according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing an arrangement relationship of a driver seat, an air conditioning unit, respective ducts, and the like provided in a cab in FIG.

FIG. 3 is a perspective view showing the air conditioning unit in FIG. 2 together with an upper duct and a lower duct.

FIG. 4 shows an air conditioning unit during cooling operation, as indicated by an arrow in FIG.
FIG. 4 is a vertical cross-sectional view as seen from the IV-IV direction.

FIG. 5 is a vertical sectional view of the air-conditioning unit during a heating operation at the same position as in FIG. 4;

FIG. 6 is a longitudinal sectional view of the air-conditioning unit at the time of branch control at the same position as in FIG. 4;

FIG. 7 is a control block diagram of the air conditioner according to the embodiment of the present invention.

FIG. 8 is a flowchart showing an air conditioning control process by a controller.

FIG. 9 is a flowchart showing an air conditioning control process following FIG. 8;

[Explanation of symbols]

 Reference Signs List 4 Cab 11 Air conditioning unit (air conditioner) 12 Casing 13 Air inlet 14 Unit case 14A Outlet 15 Outlet switching box 15A Inlet 15B Outlet (first outlet) 15C Outlet (second outlet) 18 Blower 19 Evaporator (cooler) 20 Heater core (heater) 21 Air passage 21A Cold air passage 21B Warm air passage 22 First temperature control damper (Temperature adjusting means) 23 Second temperature control damper (Temperature adjusting means) 25 Switching damper (Shunt flow) Control means) 27A, 28B, 29A Air outlet 34 Controller

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Asami 39, Higashihara, Chiyo-ji, Konan-cho, Osato-gun, Saitama F-term in Zexel Konan Plant (reference) 3L011 BA00 BH01 BJ00

Claims (5)

[Claims] 1. A casing having an air inlet on one end side and first and second outlets for sending out cool air or warm air on the other end side; A blower that circulates the sucked air toward the first and second outlets; a blower that is provided in the casing and that is located downstream of the blower and that cools air flowing through the casing to generate cool air An air conditioner comprising: a cooler; and a heater located in the casing and located downstream of the cooler and configured to heat air flowing through the casing to generate warm air. The cool air by the cooler is circulated downstream by narrowing down the air amount, and the warm air is circulated downstream by increasing the intake air amount flowing to the heater side during heating, and intermediate between the cooling time and the heating time. temperature Temperature adjustment means for controlling the amount of intake air flowing to the heater side to an intermediate air amount when adjusting, the temperature adjustment means is provided on the casing at a downstream side of the temperature adjustment means, and the temperature adjustment means When the intake air amount is controlled to an intermediate air amount, the cool air from the cooler and the warm air from the heater are diverted to separate the cool air from the first air amount.
An air-conditioning system, comprising: a flow dividing control unit that guides warm air to the second outlet side of the outlet port. 2. The temperature adjusting means is rotatably provided between an outflow side of the cooler and an inflow side of the heater. The intake air flowing to the heater side out of the cool air flowing out of the cooler. A first temperature control damper that adjusts the amount according to the opening degree, and a second temperature control damper that is rotatably provided on the outflow side of the heater and adjusts the intake air amount of warm air flowing out of the heater according to the opening degree. The air conditioner according to claim 1, wherein the first and second temperature control dampers rotate to an intermediate opening position when adjusting the air temperature to the intermediate temperature. 3. The flow dividing control means is rotatably provided on the casing between the first outlet and the second outlet, and is provided at the first rotating position. The outlet is opened and the second outlet is closed, and in the second rotational position, the second outlet is closed.
When the first outlet is closed by closing the first outlet, and the air is rotated to an intermediate position between the first rotation position and the second rotation position, the warm air flowing out of the heater is transferred to the second air outlet. 3. The air conditioner according to claim 1, further comprising a switching damper that guides the cool air from the cooler to an outlet side and guides the cool air from the cooler to a first outlet side. 4. 4. The casing has the blower therein,
A unit case containing a cooler and a heater and having one end serving as an air inlet and the other end serving as a conditioned air outlet, and a conditioned air outlet connected to the conditioned air outlet of the unit case; The switch damper has a substantially T-shaped outlet switching box having a first outlet and a second outlet. The switching damper connects the inlet of the conditioned air to a first outlet and a second outlet. The air conditioner according to claim 3, wherein the air conditioner is configured to be provided in the outlet switching box so as to be switched. 5. The cooler is disposed in the middle of an air passage in the casing, and the heater is disposed in the casing so as to close a part of the air passage located downstream of the cooler in the casing. 5. The air conditioner according to claim 1, wherein a remaining portion of the air passage corresponding to the heater is configured to open as a cool air passage. 6.