JPH0540689Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of a water-cooled sealed electric motor water canister, and is intended to prevent damage to the water canister caused by freezing due to a temperature drop when the flow of cooling water is stopped. In a water jacket composed of an electric motor frame and an outer jacket surrounding the motor frame, only the inside of the outer jacket is lined with a non-water-absorbing multicellular elastic material,
It was designed to form a water cloak.

Here, the term "sealed motor" refers to a canned type electric motor or a hermetically sealed type electric motor, and the load object thereof is limited to a pump or compressor for pumping or compressing fluid. Furthermore, most of the target equipment of this application is a non-leakage type refrigerator in a compressor.

In this case, since the rotor of the sealed electric motor is safely isolated from at least the outside air, it is impossible to cool the rotor with a cooling fan attached to the rotor as in a general-purpose electric motor.

For this reason, a cooling method using water cooling, which has an excellent cooling effect, has been developed to cool a sealed motor whose load is a refrigerator. (Japanese Patent Application No. 61-266710) This is designed to improve insulation resistance due to the water resistance of the sealed motor, to prevent destruction of the cooling water canister caused by the volumetric expansion of ice when cooling water freezes, and to improve efficiency. The outer cover of the water canopy is made of an elastic material.

However, the overall structure of the electric motor and the refrigerator that is connected and integrated with it is such that the outer cover for the water canopy is made of a highly rigid solid steel material and a flexible elastic material. This may cause a sensual feeling of discomfort due to handling such as shape and maintenance during transportation, lifting, and installation, and during post-installation maintenance, or due to an incongruity in appearance between softness and rigidity. It is something that occurs.

The present invention was developed in view of this point.
In other words, it is not necessary for the outer jacket for the water jacket of a sealed motor to be limited to an elastic material that can handle the volume expansion that occurs during cooling; instead, it is necessary to use a material with high rigidity and low elongation, and to This can be achieved by lining only the inside with a non-absorbent multicellular elastic material.

However, lining the frame of an electric motor with such a material will greatly impede cooling of the motor interior through heat conduction through the frame. Moreover, the volumetric expansion caused by ice formation occurs on the outer surface of the ice formation, that is, on the outer side of the water canopy, and not on the inner side of the frame, which is both harmful and unhelpful.

Regarding volumetric expansion due to freezing, the compressed volume of the non-water-absorbing multicellular elastic material is 10% of the cooling water volume of the water canopy.
A volume sufficient to achieve the above volume reduction is required.

Next, this will be explained with reference to the diagram. FIG. 1A shows a side view, and FIG. 1B shows a sectional view taken along YY'. 1 is a refrigerator,
A sealed electric motor drives the two, and the two are joined together by a flange. 3 is a motor frame, 4 is a stator core of the motor, 5 is a stator coil, 6 is a rotor directly connected to the shaft of the refrigerator 2, 7 is an outer jacket surrounding the outer periphery of the frame 3 and forming a water canopy, 8 numeral 9 indicates a cooling water inlet, 10 indicates a cooling water outlet, and 11 indicates a cooling water.

In the figure, while the refrigerator 2 is stopped, the cooling water is not dehydrated and the temperature of the outside air drops below zero degrees, or the refrigerant on the refrigerator side flows into the sealed motor 1 while the refrigerator is stopped. If the refrigerator starts operating under such conditions, the refrigerant will rapidly evaporate, resulting in a drop in temperature below zero, and the cooling water in the water cannula of the motor 1 will freeze. It is something that becomes. At this time, the volume expansion occurs on the outer surface of the frozen ice, but the volume of the non-water-absorbing multicellular material 8 lined inside the water mantle jacket 7 is reduced.

At that time, the volume reduction rate is designed and constructed with a margin of 10% or more of the volume of the cooling water inside the water cannula, so the water cannula envelope 7 is not subject to the enormous expansion pressure caused by freezing. No damage to the water mantle occurs at all.

As detailed above, in this invention, the water jacket of the water-cooled sealed electric motor is lined with a non-water-absorbing multi-cell material, so even if the cooling water freezes, There is no damage caused by this, and it can compensate for the weaknesses or sensual discomfort of conventional water mantle jackets made of elastic materials.

[Brief explanation of the drawing]

FIG. 1A is a side view of a water-cooled sealed electric motor for a refrigerator, and FIG. 1B is a sectional view taken along the Y-Y' axis in FIG. 1... water-cooled sealed electric motor, 2... refrigerator, 3...
...Motor frame, 4...Stator core, 5...Stator coil, 6...Rotor, 7...Water mantle cover, 8...
...Non-water-absorbing multicellular elastic material, 9...Cooling water inlet, 1
0...Cooling water outlet, 11...Cooling water.

Claims (1)

[Scope of utility model registration request] A water cooling water jacket for a water-cooled sealed motor, characterized in that the cooling water jacket is composed of a sealed motor frame and a jacket surrounding the frame, and the jacket is lined with a non-water-absorbing multicellular elastic material only on the inside of the jacket. Structure of the cloak.