JP2001071736A - Outside air introducing device for air conditioner of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide reasonably provided outside air introducing equipment for an air conditioner for a construction machine by employing the exterior rear of cub having no installation space for equipment in terms of their structure. SOLUTION: An outside air inlet 12 part is provided at the exterior rear 3 of a cab extended to surround an engine part side along the outside surface of the cab 1 in a construction machine. A duct 11 formed in the exterior rear 3 of the cab from the outside air inlet 12 part is connected through a chamber 17 provided in the interior of the cab to the outside air introducing part 21 of an air conditioner installed in the cab.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air introduction device for an air conditioner for a construction machine for taking outside air into an air conditioner mounted in a cab of the construction machine.

[0002]

2. Description of the Related Art Conventionally, an air introduction duct for an air conditioner provided in a cab of a construction machine is different from a case of an air conditioner in a normal vehicle or the like. We are struggling with measures to prevent intrusion of dust.

[0003] For this reason, for example, Japanese Patent Laid-Open No.
As disclosed by Japanese Patent No. 90624, a double-structured outside air introduction duct is attached to the outside of an outside air introduction port for an air conditioner that is opened in the cab wall, and the outside air introduction duct is connected to an outside duct. It describes a configuration in which the opening positions of the provided outside air inlet and the through-hole provided in the inner duct are provided so as not to overlap. In this outside air introduction duct, even if rainwater or dust is entrained in the outside air flowing in from the outside air suction port, the air circulation path is lengthened, and the air passage provided at the top of the inner duct is opened by collision or direction change. It is described that it is separated before passing through the hole, that the filter provided at the introduction part to the air conditioner is not obstructed by rainwater and dust intrusion, and that deterioration of air conditioning characteristics can be prevented for a long time. I have.

In Japanese Patent Application Laid-Open No. 9-290631, a dustproof filter is detachably provided outside an outside air introduction port for an air conditioner which is opened in a cab wall, and an outside air introduction hood which opens downward at the front side thereof. There is described an apparatus which is provided with an easy-to-maintain structure to prevent rainwater and dust from entering.

[0005]

In these prior arts,
In each case, a device is provided on the outside of the cab to prevent intrusion of rainwater, dust and the like in the outside air introduction portion to the air conditioner. However, these measures can be implemented on a large or medium-sized model that has a relatively large installation space in the cab, but for a model such as a small-turn hydraulic excavator, the installation space in the cab has ample space. Absent. For this reason, the installation space of the air conditioner is limited, and there is a problem in employing the outside air introduction device having the above-described structure.

Further, when the cab is downsized, there is a problem that it is inappropriate in terms of design to provide an outside air introduction portion for air conditioning on the outside of the cab.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an air conditioner for a construction machine that can be rationally provided by utilizing a rear portion outside a cab that does not have a space for installing equipment due to its structure. It is an object to provide an outside air introduction device.

[0008]

Means for Solving the Problems and Action / Effect To achieve the above-mentioned object, an outside air introduction device for an air conditioner for a construction machine according to the present invention comprises an engine section along an outside surface of a cab of the construction machine. An outside air inlet is provided at the rear outside of the cab extending to surround the side, and a duct formed by interposing a barrier portion from the outside air inlet to the inside of the rear outside of the cab is operated. It is characterized by being connected to an air conditioner outside air introduction unit installed indoors.

According to the present invention constructed as described above, the installation space is small, and the extended portion of the outer rear portion of the outside of the cab is formed so as to surround the engine section mounted on the upper revolving structure toward the cab. In addition, there is an advantage that the structure that merely serves as a so-called side cover of the engine unit can be effectively used by internally providing the outside air introduction duct to the air conditioner installed in the cab. . In addition, by causing a change in the flow path of the outside air in the duct connected from the outside air inlet to the air conditioner outside air inlet installed in the driver's cab with a barrier portion interposed therein, the rainwater accompanying the inflowing outside air can be changed. By separating the air and dust from the air conditioner, the filter provided in the outside air introduction section of the air conditioner is less likely to cause clogging and the like, so that deterioration of air conditioning characteristics can be prevented for a long time without impairing the appearance. To play. Further, since the outside air introduction port is provided on the left side of the cab having a low sound pressure level, there is an effect that noise in the cab can be reduced. Further, by providing the outside air inlet on the left outer side surface of the cab, the outside air inlet is isolated from the high-temperature engine exhaust, thereby improving the air conditioning efficiency.

The duct formed with the barrier portion interposed therebetween has a double-walled inner / outer structure at an outer rear portion of the cab, and has a slit-shaped outside air inlet provided at an upper portion of an outer plate thereof, and an inner plate. The air conditioner is connected to an air conditioner outside air introduction unit via a chamber attached to the indoor side so as to cover a conduction hole provided at a position separated from the outside air introduction port at a lower portion without overlapping with the outside air introduction port. .

In this way, if a cab (operator cab) is manufactured by assembling it by providing a slit-shaped outside air conducting port on the outer plate side and a conducting hole on the inner plate side when assembling the cab (operator cab), the duct can be used as is. Is formed, a separate chamber is manufactured, and the position is adjusted with the installation position of the air conditioner installed in the driver's cab.If the chamber is attached so as to surround the conduction hole formed in the inner plate, This has the effect of facilitating the assembling work and forming the outside air introduction duct. And in such a duct,
From the slit-shaped outside air inlet provided at the upper part of the outer plate to the outside air introduction part of the air conditioner through the chamber, the outside air flows down the flow passage formed between the inner and outer plates and is then provided to the inner plate. After passing through the communication hole, the air flow changes direction in the chamber and is guided to the outside air inlet of the air conditioner. After being separated, they pass through the filter and flow into the air conditioner. Therefore, there is an effect of extending the replacement life of the filter.

[0012] The duct formed with the barrier portion interposed therebetween has an inner / outer double wall structure at an outer rear portion of the cab, and has a slit-shaped outside air inlet provided at a lower portion of an outer plate, and an inner plate. Air-conducting holes are provided so that the flow of outside air is changed in the up-down direction and flows at a position distant from the outside air introduction port without overlapping with the outside air introduction port, and air conditioning provided in the cab surrounding the position of the conducting hole Preferably, a chamber adapted to be connected to the outside air introduction section of the machine is mounted on the inner plate. With such a configuration, the same effect as that of the duct can be obtained.

In a chamber provided so as to surround the conduction hole of the inner plate, if necessary, a partition wall for changing the direction of the air flowing from the conduction hole without going straight and guiding the air to the outlet may be provided. Good to do.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of an outside air introduction device for an air conditioner for construction equipment according to the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a cab of a construction machine provided with an outside air introduction device for an air conditioner according to the present invention, FIG. 2 is a right side view of FIG. 1, FIG. FIG. 5 is a longitudinal sectional view showing the relationship between the outside air introduction port of the duct and the communication port to the chamber, and FIG. 5 is a perspective view of the chamber attached to the cab side and a partially cutaway view of the attachment portion. .

The cab 1 shown in FIG. 1 is installed on an upper revolving structure (not shown) of a construction machine, for example, a small-swing hydraulic excavator. On the upper revolving superstructure, it is in a state of being cut out in order to secure an installation space for equipment such as an engine which is installed at a position immediately behind the cab. Only the rear left side 3 of the driver's cab 1 extends to the original rear end face position of the driver's cab, and covers the side of the engine and other equipment that fits in the cut-out portion (lower half portion 2) during installation. It has a structure.

The outside air introduction device 10 of the present embodiment for an air conditioner installed in such an operator's cab 1 is provided inside the operator's cab left outer side rear portion 3 having a double wall structure. ing. That is, the double-walled structure also serves as a duct.

A duct 11 for introducing outside air is provided between the inner and outer plates 13 and 14 in the rear portion 3 of the operator's cab on the left outer side, and is partitioned by a partition (not shown) in a required range. The outside air inlet 12 is provided with a plurality of appropriately sized horizontal slits in the upper position of the outer plate 13 in the vertical direction. In the duct 11, a conduction hole 15 of an appropriate size is opened at a position not overlapping with the outside air introduction port 12 in a lower portion on the side of the inner plate 14, and a chamber 17 is provided outside the conduction hole 15 (inside the cab). It is attached so as to be connected to the outside air introduction part 21 of the air conditioner 20. Reference numeral 22 denotes an air filter.

As shown in FIG. 5, the chamber 17 is formed in a deformable box shape that opens so as to cover the conduction hole 15, and has mounting seats 17a for the inner plate 14 on the upper side and both left and right sides adjacent to the opening. , 17b, 17c, and a mounting seat 17d for the floor of the cab is also provided on the lower side edge. Furthermore, this chamber 17
As shown in FIG. 3, the outlet 1 of the chamber 17 is surrounded so as to surround the conduction hole 15 without closing it.
A baffle plate 17e that changes the direction of the outside air in a direction opposite to the direction 8 is attached. The outlet 18 of the chamber 17 has a flat surface 17 oriented substantially perpendicular to the mounting surface for the inner plate 14.
f Opened at the center.

At the upper part of the flat surface 17f having the outlet 18 of the chamber 17, a mounting piece 19 for connecting to an outside air introduction part of the air conditioner is provided, and through a mounting bolt hole 19a provided on the mounting piece 19. The outside air introduction unit 21 side of the air conditioner 20 and the flat surface 17f provided with the outlet 18 are connected by bolting with a gasket 23 having high cushioning property.

In the outside air introduction device 10 of the present embodiment having the above-described configuration, the duct 11 formed in the rear left portion 3 of the cab 1 is set at a predetermined position when the cab 1 is manufactured. It is formed by combining and welding the inner and outer plates 13 and 14 provided with the outside air inlet 12 and the conduction hole 15. Therefore, if the chamber 17 is separately manufactured, the chamber 1 is formed after the outer shell of the cab 1 is formed.
7 having an outside air inlet 21 of an air conditioner 20 and an outlet 18 of a chamber 17 installed in a driver's cab.
7f is connected with the gasket 23 interposed therebetween, so that an outside air introduction path (duct) can be easily assembled.

In addition, in the outside air introduction passage (duct) formed as described above, the outside air introduction port 12 is located at the upper portion, and the taken in outside air is connected between the inner and outer side plates 13 and 14 to the conduction hole 15 opened at the lower portion. While flowing down the duct 11 formed and moving from the conduction hole 15 into the chamber 17, the flow state changes, so that the entrained dust and water droplets are separated, and further flow through the baffle plate 17 e in the chamber 17. Is suddenly changed, so that the suspended particles collide with the partition walls and are separated. As a result, the accompanying dust and the like are almost removed at the chamber outlet 18 and the air is introduced into the outside air introduction portion 21 of the air conditioner 20. Will be guided. Therefore, in the filter provided in the outside air introduction part 21 of the air conditioner 20, the occurrence of clogging due to dust or the like is significantly reduced, and deterioration of the air conditioning function can be prevented for a long time.

FIGS. 6 (a) and 6 (b) show a main part configuration diagram of another embodiment of the outside air introducing device.

External air introduction device 10A in this embodiment
Is basically the same as that of the above embodiment. Therefore, detailed description of the same or similar parts as in the above-described embodiment will be omitted, and the same reference numerals will be given.

The duct 11 of the outside air introducing device 10A is connected to the outside plate
The inner wall 14 has a double wall structure and is provided inside the double wall structure. The outside air introduction port 12a of this duct is provided with a plurality of horizontal slits vertically formed at a lower position (not shown, but below the outside air introduction port in the above-described embodiment in FIG. 1) in the rear portion of the outer surface. .

The duct 11 is provided with a conductive hole 15A of an appropriate size at a position lower than the inner plate 14 by an appropriate amount from the bottom 11a so as not to overlap with the outside air inlet 12, and the outside of the conductive hole 15A. A chamber 17 </ b> A is attached to (inside the operator cab) and is connected to the outside air introduction unit 21 of the air conditioner.

The chamber 17A in this embodiment is formed in a deformed box shape having a shape in which the side provided with the mounting seat for the inner plate 14 and the bottom are opened, as shown in FIG. 6 (b).
The conduction hole 15A provided on the duct 11 side is the chamber 1
7A, it is attached so that a portion corresponding to an extension of the inner plate 14 may exhibit a partition plate (partition) 14a. In FIG. 6B, for convenience of explanation, the outside air inlet 1 is shown.
2a is shown at a position close to the conduction hole 15A.

An outlet 18a is provided on one side of the chamber 17A. The side including the outlet 18a is flattened, and the chamber 17A is installed in the cab with a gasket 23 made of a relatively thick elastic material interposed therebetween. Outside air introduction part 21 of air conditioner
To be connected to.

The outside air introduction device 10A thus configured
In the same manner as the outside air introduction device 10 of the embodiment, workability at the time of manufacturing is easy, and an outside air intake duct to an air conditioner is provided in a space where no equipment or the like can be installed as an operator's cab. Dead space can be used effectively.

In addition, in the outside air introduction passage (duct) formed as described above, the outside air introduction port 12a is located at the lower portion, but the taken outside air flows through the duct 11 and reaches the conduction hole 15A. The accompanying dust and raindrops are separated by gravity, and the direction of the flow is rapidly changed by the partition plate 14a near the conduction hole 15A.
A is further classified according to the change in the flow rate in the chamber A and the flow rate in the chamber 17A to remove accompanying dust and the like. Therefore, dust and the like can be separated and supplied when the outside air is introduced into the air conditioner, so that the air filter 22 provided in the outside air introduction section 21 can be used for a long time without obstruction such as clogging and swelling due to moisture. It also has.

At the bottom of the duct 11 and the chamber 17 (17A) in the above description, drain extraction holes and dust extraction holes are provided at appropriate places, although not shown.

The baffle plate 17e inside the chamber 17 and the side plate around the conduction hole 15 (15A) in this embodiment correspond to the barrier portion in the present invention.

[Brief description of the drawings]

FIG. 1 is an external view of a cab of a construction machine including an external air introduction device for an air conditioner according to the present invention.

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a plan sectional view of a main part.

FIG. 4 is a longitudinal sectional view showing a relationship between an outside air introduction port of a duct and a conduction port to a chamber.

FIG. 5 is a partially cutaway perspective view of a chamber attached to the inside of the driver's cab and an attachment portion thereof.

FIGS. 6A and 6B are main part configuration diagrams of another embodiment of the outside air introduction device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cab 2 lower half in rear of cab 3 cab rear left outside surface 10, 10A outside air introduction device 11 duct 12, 12a outside air introduction port 13 outside plate 14 inside plate 14a partition plate 15, 15A conduction hole 17, 17A Chamber 18 Chamber outlet 20 Air conditioner 21 Outside air inlet 22 Air filter

Claims (3)

[Claims] An outside air inlet is provided at a rear portion outside the cab extending along the outer surface of the cab of the construction machine so as to surround the engine unit side, and the cab is provided from the outside air inlet. An outside air introduction device for an air conditioner for a construction machine, wherein a duct formed by interposing a barrier portion inside an outside rear portion is connected to an outside air introduction portion of an air conditioner installed in a cab. 2. A duct formed with the barrier portion interposed therebetween has an inner / outer double wall structure at an outside rear portion of the cab, and a slit-shaped outside air inlet is provided at an upper portion of an outer plate thereof.
The air conditioner is connected to the outside air introduction unit via a chamber mounted on the indoor side so as to cover a conduction hole provided at a position distant from the lower part of the inner plate without overlapping with the outside air introduction port. Item 4. An outside air introduction device for an air conditioner for construction machinery according to item 1. 3. A duct formed with the barrier portion interposed therebetween has an inner / outer double wall structure at an outer rear portion of the cab, and a slit-shaped outside air inlet is provided at a lower portion of an outer plate thereof.
A conduction hole is provided so that the flow of outside air is changed in the vertical direction and flows at a position distant from the outside air introduction port without overlapping with the outside air introduction port at an appropriate place below the inner plate, and provided in the cab surrounding the position of the conduction hole. The outside air introduction device for an air conditioner for a construction machine according to claim 1, wherein a chamber adapted to be connected to an outside air introduction portion of the air conditioner to be used is attached to an inner plate.