JPH04317816A - Operation cabin air conditioner at upper part swivelling type work machine - Google Patents

Abstract

PURPOSE:To solve various problems such as cost, maintenance, space and environment that involve the prior combustion type heating system in the heating/ cooling of an operation cabin. CONSTITUTION:A warm water heating heat exchanger 32 is provided at an operation cabin provided at an upper part swiveling body, and at the same time a warm water swivel joint 29 is provided above an upper part swiveling body 3 swiveling center at the joining portion of a lower part travel body 1 and the upper part swiveling body 3, and lower part warm water pipe passages 27, 28 connected to a lower part travel body side engine E cooling water passage, and upper part hot water pipe passages 30, 31 connected to the heat exchanger 32, are connected to each other by means of the hot water swivel joint 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a driver's cab in an upper revolving working machine such as a crane, which is composed of a lower traveling body and an upper revolving body, and has a driver's cab provided in the upper revolving body.

0002

2. Description of the Related Art FIG. 4 shows a wheel crane as an example of an upper swing type working machine.

In the figure, reference numeral 1 denotes a lower traveling body, and an upper rotating body 3 is mounted on this lower traveling body 1 via a swing bearing 2. This upper rotating body 3 is equipped with a rotating body 3 for both crane operation and traveling. A driver's cab 4 for use is provided. 5 is boom.

On the other hand, an engine E as a power source is installed in the lower traveling body 1, and various operations of the upper rotating body 3, such as swinging and raising and lowering the boom, are performed by pressure oil from a hydraulic pump driven by the engine E. It will be done.

A hydraulic swivel joint 6 is provided on the rotation center O of the upper rotating body 3 at the upper and lower connecting portion by the swing bearing 2, and hydraulic piping for a pump circuit and a tank circuit provided on the lower traveling body 1 side, A hydraulic piping of a hydraulic actuator circuit provided on the upper revolving body 3 side is connected through this swivel joint 6.

[0006] Furthermore, this wheel crane is equipped with an air conditioner for the driver's cab 4. The structure and operation of this conventional air conditioner will be explained with reference to FIG.

(Cooling) Pressure oil from a hydraulic pump 7 driven by the engine E is sent through a pump line 8 and a swivel joint 6 to a hydraulic motor 9 on the upper revolving structure 3 side, and is cooled by this motor 9. The compressor 10 during the cycle is driven to rotate.

Reference numeral 11 indicates a tank pipe for returning oil returned from the motor 9 to the tank T, and 12 indicates an electromagnetic clutch provided between the motor 9 and the compressor 10.

[0009] The refrigerant compressed by the compressor 10 to a high temperature and high pressure is transferred to a condenser 13, a receiver 14, and an expansion valve 15.
The air then enters a heat exchanger (evaporator) 16, where it performs a heat exchange action, and then returns to the compressor 10. 17 is a condenser fan, and 18 is a fan of the heat exchanger 16.

(Heating) An oil combustion heating system is used for heating. That is, 19 is a combustion type heater provided in the driver's cab 4, and fuel (kerosene or light oil) is supplied from a fuel tank 20 installed in the upper revolving structure 3 outside the driver's cab 4.
is combusted by this heater 19, and the interior of the driver's cabin 4 is heated by the combustion heat.

Note that 21 is a control panel that performs cooling control, and 22 is a heater control panel that performs heating control.

0012

[Problems to be Solved by the Invention] Conventional air conditioners for upper-swivel working machines employ oil-burning heating systems for heating as described above, which causes various problems such as the following. Ta.

■ The heating equipment becomes large-scale due to the heater 19, tank 20, exhaust duct (not shown), etc.
In addition to high equipment costs, running costs also increase due to fuel costs.

[0014] Since oil is burned, special attention must be paid to ensuring safety including fire prevention, and maintenance is extremely troublesome due to the necessity of fuel management and refueling.

[0015] Since the heater 19 is large and requires a large fuel tank 20, the space occupied by these elements becomes large, and the upper revolving body 3 becomes larger accordingly.

[0016] There are environmental problems peculiar to combustion heating systems, such as the generation of odors and air pollution due to the combustion of oil.

By the way, as another heating method, a method in which high-temperature refrigerant compressed by a compressor in a refrigeration cycle is sent to a heat exchanger as a heat source is also adopted in some cases, but according to this method, both cooling and heating Since only one of these can be performed, there is a problem in that a dehumidifying function cannot be obtained by using both in combination.

On the other hand, a problem with the cooling system is that a dedicated pump 7 and motor 9 are required, which is disadvantageous in terms of equipment cost and space. Furthermore, since engine power is transmitted to the compressor 10 via the pump 7 and the motor 9, there is a problem in that power loss is large.

Therefore, the invention of claim 1 solves the various problems faced by combustion heating systems while maintaining the dehumidification function, and provides an upper-swivel type work system that is advantageous in terms of cost, maintenance, space, and environment. It provides mechanical air conditioning equipment.

[0020] In addition to the object of the invention of claim 1, the invention of claim 2 provides an air conditioner for an upper swing type working machine that can simplify equipment and reduce power loss in the cooling system. It provides equipment.

[0021]

[Means for Solving the Problems] The invention of claim 1 provides an upper revolving working machine in which an upper rotating body is mounted on a lower traveling body, an engine is provided on the lower traveling body, and a driver's cab is provided on the upper rotating body. , a heat exchanger for hot water heating is provided in the operator's cab, and a hot water swivel joint is provided on the center of rotation of the upper revolving structure at the joint between the lower traveling structure and the upper revolving structure, and a hot water swivel joint is provided in the cooling water channel of the engine. The connected lower hot water pipe and the upper hot water pipe connected to the heat exchanger are connected by the hot water swivel joint.

The invention of claim 2 provides an upper revolving working machine in which an upper rotating body is mounted on the lower traveling body, an engine is provided on the lower traveling body, and a driver's cab is provided on the upper rotating body. , a compressor constituting a refrigeration cycle for cooling is provided to be driven by the engine, and a heat exchanger for hot water heating and a heat exchanger for cooling are respectively provided in the operator's cabin, and a lower part of the compressor is provided. A hot water swivel joint and a refrigerant swivel joint are provided above the center of rotation of the upper revolving body at the joint between the traveling body and the upper revolving body, and a lower hot water pipe connected to the cooling water channel of the engine and the heating heat The hot water swivel joint connects an upper hot water pipe connected to the exchanger, and a lower refrigerant pipe connected to the compressor and an upper refrigerant pipe connected to the cooling heat exchanger. They are connected by the above-mentioned refrigerant swivel joint.

[0023]

According to the structure of claim 1, since the coolant heat, which is engine exhaust heat, is used as a heating heat source, a dedicated heat source for heating is not required. Therefore, large-scale heating equipment such as a combustion heater and a fuel tank, which are required in conventional combustion heating systems, are not required.

Moreover, since the heating and cooling systems are separate systems, the dehumidifying function can be maintained by using both systems together.

According to the second aspect of the present invention, in addition to the hot water heating system of the first aspect, the compressor of the refrigeration cycle is directly driven by the engine, and the refrigerant from the compressor is passed through the swivel joint to the upper refrigerant pipe. This eliminates engine power loss due to the intervention of a pump and motor.

[0026]

[Embodiment] An embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

First Embodiment (See FIGS. 1 and 2) In this embodiment, the cooling system is the same as the conventional device shown in FIG. do.

In FIG. 1, 23 is a water pump for circulating engine cooling water, and 24 is a radiator.

A discharge side (high temperature side) pipe 25 and a return side (low temperature side) pipe 2 from the engine E in this cooling waterway.
6, both the lower outbound and return side hot water pipes 27,
28 are connected, and both hot water pipes 27 and 28 are connected to one end of an upper outgoing hot water pipe 30 and an upper incoming hot water pipe 31 on the upper revolving body 3 side, respectively, via a hot water swivel joint 29. There is.

[0030] In the operator's cab 4, a heat exchanger 1 of the cooling system is installed.
A heating system heat exchanger 32 is provided separately from the heating system 6, and the other ends of both upper hot water pipes 30 and 31 are connected to the inlet and outlet of this heat exchanger 32.

33 is a fan of this heat exchanger 32, and 34 is a central control panel that controls both the cooling and heating systems.

With this configuration, a portion of the high temperature cooling water discharged from the engine E is routed from the lower outgoing hot water pipe 27 to the hot water swivel joint 29 to the upper outgoing hot water pipe 30 to the heat exchanger 32 to the upper part. It circulates along the route of return side hot water pipe 31 → swivel joint 29 → lower return side hot water pipe 28 → engine E, and is heated to the driver's cab 4 by the heat exchange action in the heat exchanger 32.
The inside is heated.

In other words, since engine exhaust heat can be used as a heating heat source, large-scale equipment such as a heat source (conventional combustion type heater) dedicated to heating and a fuel tank is not required. Only the exchanger 32 and fan 33 need be provided.

[0034] Therefore, compared to conventional devices, the heating equipment is greatly simplified, the cost of the equipment is much lower, and the space occupied by the equipment is much smaller. Also,
Since no fuel is required, running costs are lower, and there is no need for careful monitoring and maintenance to ensure safety, including fuel management, replenishment, and fire prevention, and there is less equipment to maintain. Moreover, since it is easy to manage, maintenance is extremely simple.

Furthermore, unlike the case where a high temperature refrigerant is used as a heat source in a refrigeration cycle, simultaneous operation of cooling and heating is possible, so that a dehumidifying function can be ensured.

[0036] In addition, the heat exchanger 16 is used for both cooling and heating.
, 32, it is possible to centrally control these using one control panel 34. In addition,
It is also possible to combine the fans 18, 32 of both heat exchangers 16, 32 into one, which further facilitates centralized control.

By the way, when the distance between the engine E and the heat exchanger 32 is long, an auxiliary pump may be provided in the upper or lower hot water pipe to ensure the flow rate and pressure of hot water.

The hydraulic and hot water swivel joints 6, 29 used in this air conditioner are arranged concentrically on the pivot center O of the upper revolving body 3 at the upper and lower joints. This will be explained with reference to FIG.

As shown in the figure, on the pivot center O, a hydraulic swivel joint 6 is provided on the lower side, and a hot water swivel joint 29 is provided on the upper side.

Both of these swivel joints 6, 29 are composed of bodies 6a, 29a and stems 6b, 29b, respectively. The body 6a of the hydraulic swivel joint 6 is attached to the upper rotating body (revolving frame) 3, and the stem 6b is attached to the lower traveling body (traveling frame). body frame) 1.

In the hydraulic swivel joint 6, pump lines (pipes) 8 and 11 shown in FIG. These pipes are connected to each other, and these pipes communicate with each other through a joint internal flow path.

Further, the stems 6b, 29b of both swivel joints 6, 29 are provided with tunnel-shaped hollow portions 35, 36 in their respective centers, communicating with each other in the vertical direction, and connecting hot water pipes on both the outgoing and returning sides of the lower part. Channels 27, 28 are passed through these hollows 35, 36.

On the other hand, both the upper outgoing and incoming hot water pipes 30 and 31 are connected to the body 2 of the hot water swivel joint 29.
9a, and upper and lower corresponding hot water pipes are connected to each other via a flow path (not particularly designated) formed between the body 29a and the stem 29b.

In this way, the structure is such that hot water is circulated between the engine E on the lower traveling body 1 side and the heat exchanger 32 on the upper revolving body 3 side via the swivel joints 6 and 29. .

Second Embodiment (See FIG. 3) In this second embodiment, the same hot water heating system as in the first embodiment is used for heating, and the same hot water heating system as the first embodiment is used for cooling.
A configuration different from that of the embodiment is adopted.

[0046] Therefore, the repeated explanation of the heating system will be omitted, and only the cooling system will be explained. In addition,
The refrigeration cycle itself of the cooling system is the same as in the first embodiment.

In this embodiment, the so-called outdoor unit, that is, the compressor 10 and the condenser 13 (including the condenser fan 17), among the elements constituting the refrigeration cycle.
, a receiver 14, and an expansion valve 15 are installed on the lower traveling body 1 side, and the compressor 10 is directly driven by the engine E. 37 is an electromagnetic clutch provided between this engine E and the compressor 10.

A refrigerant swivel joint 38 is provided along with the hot water swivel joint 29 on the rotation center O, and the refrigerant is transferred from the compressor 10 to the lower refrigerant outgoing pipe 39 to the refrigerant swivel joint 38 to the upper refrigerant outgoing pipe 40. → In the route of heat exchanger 16 → Upper return side refrigerant pipe 4
The cooling operation is performed by circulating the refrigerant through the following route: 1→refrigerant swivel joint 38→lower return side refrigerant pipe 42→compressor 10.

According to this configuration, the dedicated pump 7 and motor 9 that were necessary in the first embodiment can be omitted as cooling equipment while ensuring the same cooling function as in the first embodiment.

[0050] Therefore, the equipment is simplified and the equipment cost is reduced. Further, since there is no power loss due to interposing the pump 7 and motor 9 between the engine E and the compressor 10, energy efficiency is improved.

[0051] In the upper revolving type work machine, each operation on the upper revolving body 3 side is normally performed by hydraulic pressure, and even in the configuration of this second embodiment, a hydraulic swivel joint is required, so the total Three types of swivel joints are arranged concentrically on the pivot center O.

By the way, as a modification of the second embodiment, only the compressor 10 of the outdoor unit is directly driven by the engine E on the lower traveling structure 1 side, and the other elements are driven by the upper rotating structure 3 as in the first embodiment. It may be installed on the side.

[0053]

[Effects of the Invention] As described above, according to the invention of claim 1, in an upper swing type working machine such as a wheel crane, engine cooling water is supplied to the operator's cab of the upper swing structure via a hot water swivel joint for heating purposes. Because the system is configured to send cooling water heat, which is engine exhaust heat, to a heat exchanger and use it as a heat source for heating the driver's cabin, there is no need for large-scale equipment such as a combustion heater and fuel tank, which is required in conventional combustion heating systems. No longer needed. Therefore, both equipment cost and running cost are low.

[0054] Maintenance is extremely simple because there is no need to pay special attention to ensuring safety including fire prevention, and there is no need for fuel management or refueling.

[0055] The equipment is simple and compact, and the space occupied can be significantly reduced.

[0056] Environmental problems peculiar to combustion heating systems, such as odor generation and air pollution due to combustion of oil, are eliminated.

Furthermore, since this heating system is a separate system from the cooling system, the dehumidifying function can be maintained by using both together.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the compressor of the refrigeration cycle is directly driven by the engine, and the refrigerant from the compressor is passed through the swivel joint to the upper refrigerant pipe. This eliminates engine power loss due to the intervention of a pump and motor, increasing energy efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a cooling and heating system of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a partially sectional front view of a swivel joint used in the device of the embodiment.

FIG. 3 is a diagram showing a cooling and heating system of an air conditioner according to a second embodiment of the present invention.

FIG. 4 is a side view showing a schematic configuration of a wheel crane as an example of an upper swing type working machine.

FIG. 5 is a diagram showing a cooling and heating system of a conventional air conditioner.

[Explanation of symbols]

1 Lower traveling body 3 Upper rotating body O Turning center of upper rotating body 4 Driver's cab E Engine 32 Heat exchanger for heating the driver's cab 29 Hot water swivel joint 27 Lower outgoing hot water pipe 28 Lower returning hot water pipe 30 Upper outward path Side hot water pipe 31 Upper return side hot water pipe 10 Compressor 13 constituting a refrigeration cycle for cooling Condenser 14 Receiver 15 Expansion valve 16 Heat exchanger 39 Lower outgoing refrigerant pipe 42 Lower return refrigerant pipe 38 Refrigerant swivel joint 40 Upper outgoing refrigerant pipe 41 Upper return refrigerant pipe

Claims (2)

[Claims] Claim 1: An upper rotating working machine in which an upper rotating body is mounted on a lower traveling body, an engine is provided on the lower traveling body, and a driver's cab is provided in the upper rotating body, wherein the operator's cab is equipped with a heat exchanger for hot water heating. A hot water swivel joint is provided above the center of rotation of the upper rotating body at the joint between the lower traveling body and the upper rotating body, and a lower hot water pipe connected to the cooling water channel of the engine, An air conditioner for an operator's cab in an upper swing type working machine, characterized in that an upper hot water pipe connected to an exchanger is connected by the hot water swivel joint. 2. An upper swing type work machine in which an upper rotating body is mounted on a lower traveling body, an engine is provided on the lower traveling body, and a driver's cab is provided on the upper rotating body, wherein the lower traveling body includes:
A compressor constituting a refrigeration cycle for cooling is provided to be driven by the engine, and
A heat exchanger for hot water heating and a heat exchanger for cooling are provided in the operator's cab, respectively, and a hot water swivel joint and a hot water swivel joint are installed on the center of rotation of the upper revolving body at the joint between the lower traveling body and the upper revolving body. A refrigerant swivel joint is provided, and the lower hot water pipe connected to the cooling water channel of the engine and the upper hot water pipe connected to the heating heat exchanger are connected by the hot water swivel joint, and A driver's cab in an upper swing type work machine, characterized in that a lower refrigerant pipe connected to the compressor and an upper refrigerant pipe connected to the cooling heat exchanger are connected by the refrigerant swivel joint. Air conditioner.