JP3513286B2 - Engine driven air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to an engine driving type air conditioner. 2. Description of the Related Art FIG. 6 is a system diagram of a conventional air conditioner of this kind.
Is shown in During the cooling operation, when the compressor 2 is driven by the water-cooled engine 1, the gas refrigerant discharged from the compressor 2 enters the outdoor heat exchanger 4 through the four-way valve 3 as shown by the solid arrow, where Condensed and liquefied by radiating heat to the outside air sent by the outdoor fan 7. The liquid refrigerant adiabatically expands in the process of flowing through the throttle mechanism 5 and then enters the indoor heat exchanger 6 where it evaporates by cooling the indoor air sent by the indoor fan 8. Thereafter, the gas refrigerant returns to the compressor 2 via the four-way valve 3. [0004] During the heating operation, the four-way valve 3 is switched in the opposite direction, and the refrigerant discharged from the compressor 2 receives the four-way valve 3, the indoor heat exchanger 6, the throttle mechanism 5, the outdoor After passing through the heat exchanger 4 and the four-way valve 3 in this order, the compressor 2
Return to [0005] The engine cooling water heated by cooling the engine 1 enters the radiator 9, where it cools by radiating heat to the outside air sent by the outdoor fan 7, and is then energized by a cooling water circulation pump 10 to be energized by the cooling water circulation pump 10. Return to 1. This engine cooling water circuit has a reserve tank
16 are connected. The water-cooled engine 1, the reserve tank
16, the compressor 2, the outdoor heat exchanger 4, the outdoor fan 7, the radiator 9, and the like are housed and installed in the housing 12 of the outdoor unit 11, as shown in FIG. The engine cooling water is prepared by diluting ethylene glycol with water. When the temperature of the engine cooling water rises due to the operation of the engine 1, the water evaporates and the viscosity of the ethylene glycol increases due to an increase in the concentration of ethylene glycol.
The load on the cooling water circulation pump 10 increases. Therefore, a float switch 17 for detecting the liquid level is provided in the reserve tank 16, and when the liquid level in the reserve tank 16 falls below a predetermined value, the engine 1 is stopped by a signal from the float switch 17. . In addition, 18
Is a cap, and 19 is an exhaust port that allows overflow of cooling water. [0009] In the above-mentioned conventional air conditioner, when the liquid level in the reserve tank 16 decreases, the engine 1 is suddenly stopped by a signal from the float switch 17. there were. If the outdoor unit 11 shakes during an earthquake, strong wind, or the like, the float switch 17 may malfunction and the engine 1 may be stopped. [0011] SUMMARY OF THE INVENTION The present invention was invented to solve the above problems, it is an Abstract of their a compressor driven by a water-cooled engine, an outdoor heat The water-cooled engine is formed by a water-cooled engine, a radiator, a circulating pump, and a reserve tank that stores engine cooling water whose viscosity increases when moisture evaporates, while forming a refrigeration cycle with an exchanger, a throttle mechanism, an indoor heat exchanger, and the like. An engine-driven air conditioner, wherein the reserve tank is provided with a float switch for liquid level detection, wherein the water-cooled engine comprises:
Outdoor unit with reserve tank, compressor and outdoor heat exchanger
When the liquid level of the engine cooling water stored in the reserve tank falls below a predetermined value.
Action of the liquid level sensing float switch which operates in
When the operation state continues for a predetermined time or more , the water-cooled engine
Stop the engine and, if within the specified time, use the water-cooled engine
An engine-driven air conditioner is provided with an engine cooling water protection device that does not stop the engine. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a system diagram, FIG. 2 is a flowchart, and FIG. 3 is a reserve tank. It is an expanded sectional view of. As shown in FIG. 1, a water supply pipe 20 is connected to the reserve tank 16, and a water supply valve 21 is interposed in the water supply pipe 20. As shown in FIG. 3, a float switch 17 for detecting the liquid level is fixed to the tank cap 18 of the reserve tank 16, and the hole diameter D of the mounting opening 24 of the tank cap 18 is fixed.
Is larger than the diameter d of the float 17A of the float switch 17. The float switch 17 is activated when the liquid level of the engine cooling water 22 stored in the reserve tank 16 drops below a predetermined value, and this signal is input to the cooling water protection device 23. As shown in FIG. 2, when a signal from the float switch 17 is input, the cooling water protection device 23 outputs the signal to the water supply valve 21 to open the same and opens it for a predetermined period of time, for example, 30 seconds. When the time has elapsed, the water supply valve 21 is closed.
Thus, the engine cooling water is supplied from the water supply pipe 20 through the water supply valve 21 into the reserve tank 16, and when the level of the engine cooling water 22 in the reserve tank 16 rises, the float switch 17 is turned off. Other configurations are the same as those of the related art shown in FIGS. 6 and 7, and corresponding members are denoted by the same reference numerals and description thereof will be omitted. Thus, when the float switch 17 is operated, the engine cooling water is automatically supplied into the reserve tank 16, so that the stop of the engine 1 can be avoided. The float switch 17 is fixed to the tank cap 18 and the hole diameter D of the mounting port 24 is
A is larger than the diameter d of A.
The float 17A can be pulled out from the mounting port 24 by removing the float switch 17 from the mounting hole 24. Therefore, it becomes easy to mount and remove the float switch 17, and the cost can be reduced. A second embodiment of the present invention is shown in FIGS. In the second embodiment, as shown in FIG. 4, when the float switch 17 is operated, the signal is input to the engine cooling water protection device 30. As shown in FIG. 5, the engine cooling water protection device 30 outputs to the engine 1 and stops the operation when the operation state of the float switch 17 continues for a predetermined time set therein, for example, three minutes or more. ing. The water-cooled engine 1, the reserve tank
16, compressor 2, outdoor heat exchanger 4, etc.
As shown in FIG. 7, it is housed and installed in the housing 12 of the outdoor unit 11. In addition, the reserve tank 16 can be configured as shown in FIG. The other configuration is the same as that of the conventional one shown in FIG. 6, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted. Thus, when the float switch 17 is operated due to a decrease in the amount of the engine cooling water 22 in the reserve tank 16, that is, when the operation state of the float switch 17 continues for a predetermined time or more, the engine 1 is stopped. If the operating state is within the predetermined time, the engine 1 does not stop. Therefore, if the outdoor unit 11 is temporarily shaken by the earthquake or the wind, the engine 1 does not stop.
As a result, troubles such as service and inspection based on the malfunction of the float switch 17 can be avoided. [0023] In the present onset light according to the present invention, the water-cooled engine, the reserve tank, a compressor, with the outdoor heat exchanger is positioned accommodated in the outdoor unit, an engine cooling water reserved in the reservoir tank When the operating state of the liquid level detection float switch that operates when the liquid level of the liquid drops to a predetermined value or less continues for a predetermined time or more, the engine cooling water protection device stops the water-cooled engine, and the engine cooling water protection device stops the operation within a predetermined time. If, because it does not stop the water-cooled engine, it is possible to prevent the stopping of the water-cooled engine in the case where the outdoor unit is rocked by an earthquake or wind. [0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing a first embodiment of the present invention. FIG. 2 is a control flowchart of the first embodiment. FIG. 3 is an enlarged sectional view of a reserve tank according to the first embodiment. FIG. 4 is a system diagram showing a second embodiment of the present invention. FIG. 5 is a control flowchart according to the second embodiment. FIG. 6 is a system diagram of a conventional engine-driven air conditioner. FIG. 7 is a schematic sectional view showing an outdoor unit of a conventional engine-driven air conditioner. [Description of Signs] 1 Engine 2 Compressor 4 Outdoor heat exchanger 5 Throttle mechanism 6 Indoor heat exchanger 16 Reserve tank 17 Float switch 20 Water supply pipe 21 Water supply valve 23 Engine cooling water protection device

Continued on the front page (72) Michio Yoneda, Michio Yoneda, Nagoya Research Laboratories, Nagoya Research Laboratory, Nagoya Research Institute No. 1 Inside Mitsubishi Heavy Industries, Ltd. Aircon Works (56) References JP-A-6-33761 (JP, A) JP-A-54-82509 (JP, A) Fully open 1981-117018 (JP, U) Really open 54-82830 (JP, U) JP-A 5-73232 (JP, U) JP-A 7-14133 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01P 11 / 00 F24F 5/00 F25B 27/00

Claims (1)

(57) Claims 1. A refrigeration cycle is formed by a compressor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, and the like driven by a water-cooled engine. A radiator, a circulating pump, and a reserve tank for storing engine coolant whose viscosity increases when moisture evaporates form a cooling water circuit of the water-cooled engine, and the reserve tank is provided with a float switch for liquid level detection. An air conditioner, wherein the water-cooled engine, the reserve tank, the compressor, and the outdoor heat exchanger are housed and arranged in an outdoor unit, and the level of engine cooling water stored in the reserve tank is equal to or less than a predetermined value. When the state of operation of the float switch for detecting the liquid level, which is activated when An engine-driven air conditioner provided with an engine cooling water protection device that stops a cold engine and does not stop the water-cooled engine within a predetermined time.