JPS60142194A - Lubricating oil cooling device of reduction gear - Google Patents

Abstract

PURPOSE:To permit to obtain a compact lubricating oil cooling device by a method wherein an evaporator is provided in a reduction gear box and a condenser is provided at the outside of the reduction gear box while an enclosed circulating system is formed by sealing a heat transfer medium, changeable reversibly between gas and liquid phases, into the system. CONSTITUTION:An evaporator 1 is provided in a reduction gear box 5 and a condenser 2 is provided at the outside of the same box 5 while both of them are connected through a gas phase pipeline 3 and a liquid phase pipeline 4. An enclosed circulating system is formed by the evaporator 1, the condenser 2 and the pipelines 3, 4 and the heat transfer medium of Flon or the like, changeable reversively between gas and liquid phases, is sealed into the system under a vacuum condition. Heat, generated by the operation of the reduction gear, increases the temperature of respective parts in the gear and the lubricating oil 7. The heat transfer medium in the evaporator 1 is evaporated, boiled and changed into gas, then, moves to the condenser 2 through the gas phase pipeline 3, becomes liquid by being deprived the heat thereof and condensed, returns into the evaporator 1 again through the liquid phase pipeline 4 and releases the heat of the lubricating oil in the reduction gear box to the outside thereof during circulating in the system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cooling device that transfers heat by utilizing condensation and vaporization of a heat transfer medium sealed in a sealed system, and in particular, a cooling device that transfers heat by utilizing condensation and vaporization of a heat transfer medium sealed in a closed system. This relates to a lubricating oil cooling device that dissipates the heat of the lubricating oil generated inside the gear reducer to the outside by installing the condensing part outside the reducer box.

In a gear reducer, lubricating oil is stored in the reducer box to lubricate the gears and other parts inside the reducer, but as the reducer operates, the temperature of the lubricating oil rises. must be cooled. Conventionally, in this type of gear reducer, a general heat exchanger (shell/tube type, plate type heat exchanger, etc.) using cooling water as a refrigerant is installed as a lubricating oil cooling facility, or air is used as a refrigerant. Lubricating oil is cooled using an air-cooled oil cooler. However, water-cooled cooling equipment requires extensive water supply equipment and cooling water piping, and can be installed in trenches, locations with poor cooling water quality, poor cooling water sources, or high locations.
It cannot be used on moving objects. In the case of an air-cooled type, the heat transfer performance is poor because heat is exchanged between the lubricating oil and the air, so the cooler must be large, and a blower and a blower to send cooling air to the cooler are required. A driving device is required, which naturally limits the scope of application. Both water-cooled and air-cooled systems require a drive pump and its oil piping to circulate the lubricating oil that is to be cooled. In this way, conventional water-cooled and air-cooled coolers require the installation of various accessories, which increases the number of causes of trouble, and problems with these accessory threads can interfere with the operation of the main gear reducer itself. This sometimes caused

An object of the present invention is to provide a compact lubricating oil cooling device that does not use cooling water and does not require any continuous cooling drive device.

According to one embodiment of the lubricating oil cooling device according to the present invention, an evaporator is disposed inside the reducer box, a condenser is provided outside the reducer box, and the evaporator and the condenser are arranged in a gas phase mode. The piping and the liquid phase piping are connected to form an unclosed circulation system i~, and the condenser is surrounded by a cylindrical body with a finned Iw in which a plurality of fins extending in the Q11 direction are formed on the outer 11111 part. A heat transfer medium that undergoes a reversible change between a gas phase and a liquid phase is enclosed within the circulation system.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of a lubricating oil cooling device according to the present invention. An evaporator l is installed inside the gear reducer box 5, and a condenser 2 is installed outside the reducer box 5, and these are connected to the gas phase piping 3 and the liquid phase piping 4.
are connected. The evaporator 1, the condenser 2, and the pipes 3 and 4 form a circulation system (heat exchange system) that is sealed from the outside. A heat medium is sealed in a vacuum state. Lubricating oil 7 for lubricating gears, shafts, etc. is stored in the reducer box 5. The heat generated by the operation of the reducer increases the temperature of each component within the reducer and the lubricating oil 7. The heat transfer medium in the evaporator 1 evaporates and boils due to the heat of this lubricating oil, becomes a gas, and moves to the condenser 2 through the gas phase pipe 3. In the condenser 2, the heat transfer medium in the gas phase loses heat υ to the outside air and condenses, becomes a liquid and returns to the evaporator 1 through the liquid phase piping 4. In this way, the inside of the system is As it circulates, the heat of the lubricating oil inside the reducer box is released to the outside.

2 and 3 are cross-sectional views showing various embodiments of the condenser according to the present invention. In the embodiment shown in FIGS. 1 and 2, the condenser is constituted by a finned heat dissipation tube 6 having a plurality of axially long radial fins 8 on its outer side. In the embodiment of FIG. 3, the housing has radial fins 8.
A cylindrical body 9 surrounding these fins 8 is provided at the outer end of the fins 8.
are fixed to form a condenser. Such a structure facilitates the natural circulation of external air around the M and m units, and the contact area with the external air is increased by the plurality of fins 8 or cylinders 9, and the heat transfer medium in the heat dissipation tube 6 is heat is released to the outside more effectively. In the embodiment shown in Fig. 3, by arranging the heat dissipation pipes 6 vertically, external air blows through the cylinder from bottom to top due to a kind of chimney effect, resulting in a good natural wind flow. Heat dissipation is provided.

As described above, according to the present invention, the heat transfer medium releases the heat of the lubricating oil to the outside while repeating evaporation, movement, condensation, and movement using only the natural cooling of the outside air and the heat from the lubricating oil. Therefore, no drive is required as a means of discharging heat, such as moving the heat transfer medium or conducting cooling air, and since the evaporator is installed inside the reducer box, it cools the lubricating oil that is the object of cooling. There is no need for a special drive system to circulate the heat to the outside, and troubles due to failure of these drive systems will not occur.As a reducer, heat is released to the outside via the heat transfer medium in the closed system, so there is no need for external communication. It is compact with no joints, and uses natural cooling from external air as the means of cooling the heat transfer medium. 13F4 is applicable not only to gear reducers but also to hydraulic oil cooling systems for various equipment where it is desirable to prevent cooling fluid from coming into contact with internal parts, etc., and for transformer oil cooling systems at power plants and substations. is also useful.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the lubricating oil cooling device of the present invention, FIG. 2 is a cross-sectional view showing an embodiment of the condenser M according to the present invention, and FIG. 3 is a schematic side view of the lubricating oil cooling device of the present invention. It is a cross-sectional view showing an embodiment of 1. Evaporator, 2. Condenser, 3. Gas phase piping, 4. Liquid phase piping, 5. Reducer box, 6... Heat dissipation tube, 7... Lube oil, 8...
・Fin, 9... Cylindrical body. Temporary agent Patent attorney Rikichi Somekawa

Claims (2)

[Claims] (1), Reduction (an evaporator is placed in a shallow box, a condenser is provided outside the reducer box, and the evaporator and condenser are connected with gas phase piping and liquid phase piping and sealed) A circulating system is formed, and a heat transfer medium that changes into gas and liquid is enclosed in the circulating system, and the condenser is composed of a finned tube having a plurality of fins on the outer side. Lubricating oil cooling system for gear reducer. (2) The finned tube of the condenser is constructed by fixing a cylindrical body around each fin to the outer end of radial fins. A lubricating oil cooling device for the gear reducer described in item 1.