JPH0542689U - Hermetic compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain good lubricity of the compressor regardless of the two-phase separation of lubricating oil and liquid refrigerant, and to expand the selection range of lubricating oil type. [Composition] A compressor 2 and an oil pump 6 are arranged in an airtight container 1, and an oil layer of lubricating oil L stored in a lower space 1a of the airtight container 1 is provided at a suction port 6a portion of the oil pump 6. A floating member X that floats the suction port 6a is provided corresponding to the portion. The floating member X is composed of a flexible hose 12 and a floating body 13 attached to the tip of the flexible hose 12 and having a specific gravity at least smaller than that of the liquid refrigerant F. With this configuration, when the oil level of the lubricating oil L rises due to the liquid refrigerant F accumulated while the apparatus is stopped, the substantial height position of the suction port 6a of the oil pump 6 changes correspondingly, The suction port 6a is always located in the lubricating oil L, which prevents the liquid refrigerant F from being sucked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hermetic compressor.

[0002]

[Prior Art]

FIG. 2 shows a conventional hermetic compressor Z ₀ for a general air conditioner. In this hermetic compressor Z ₀ , a compressor 2 having a crankshaft 4 slightly below the vertical middle position in a vertically long cylindrical hermetic container 1 is used with the crankshaft 4 oriented vertically. It is fixedly arranged by a stay 5, and a motor 3 having a stator 31 and a core 32 is arranged vertically above the compressor 2, and the crankshaft 4 is rotationally driven by the motor 3. It has become. Then, the refrigerant gas introduced from the refrigerant gas inlet 7 penetrating the peripheral wall of the hermetically sealed container 1 is compressed to a predetermined pressure by the compressor 2 and discharged from the refrigerant gas outlet 8 to the refrigerant circulation system. (For a conventional example of such a hermetic compressor, see, for example, Japanese Utility Model Laid-Open No. 2-44666).

Further, in this hermetic compressor Z ₀ , in order to supply the lubricating oil L to the lubricating parts such as the crank part of the compressor 2, its lower end surface is provided at the axial center part of the crankshaft 4. An oil passage 41 that opens upwardly and extends upward and oil supply holes 42 and 43 that branch from the oil passage 41 to the lubrication parts are formed, while at the lower end opening end of the oil passage 41, a suction port An oil pump 6 including a cylindrical casing 6b forming 6a and vanes 6c arranged in the casing 6b is attached. The oil pump 6 rotates integrally with the crankshaft 4 when the motor 3 rotates the crankshaft 4, and the blades 6c of the oil pump 6 collect the lubricating oil L accumulated in the lower space 1a of the closed container 1. Is sucked from the suction port 6a and can be supplied to the lubrication portion of the compressor 2 through the oil passage 41 and the oil supply holes 42 and 43.

[0004]

By the way, in such a hermetic compressor for an air conditioner, since the refrigerant circulates in a gas state during its operation, the refrigerant is circulated in the lower space 1a of the hermetic container 1. Almost only the lubricating oil L is accumulated. For this reason, the oil pump 6 can efficiently supply the lubricating oil L to the respective lubrication parts of the compressor 2, and therefore the occurrence of poor lubrication of the lubrication parts is unlikely to occur.

However, when the air conditioner is stopped for a long time, the refrigerant gas in the closed container 1 during operation is gradually condensed due to its pressure decrease or temperature decrease, and this becomes the liquid refrigerant F in the lower space 1a. Collect. In this case, since the lubricating oil L has a smaller specific gravity than the liquid refrigerant F, when the compatibility between the lubricating oil L and the liquid refrigerant F is poor, as shown in FIG. And are separated into two phases, upper and lower. Therefore, when the operation of the hermetic compressor Z ₀ is restarted along with the restart of the air conditioner with the lubricating oil L and the liquid refrigerant F separated into the upper and lower two phases in this way, the oil pump 6 Since the suction port 6a is located not in the lubricating oil L but in the liquid refrigerant F below it, the oil pump 6 sucks the liquid refrigerant F and supplies it to the lubricating portion. As a result, poor lubrication occurs in the lubricated part, resulting in serious problems such as impaired durability.

Further, as one method of preventing such a problem, when selecting the types of the lubricating oil L and the liquid refrigerant F, the compatibility between them is sufficiently taken into consideration, and the lubricating oil L and the liquid refrigerant F are considered. It is conceivable that and will not be separated into two phases and will be pooled in the lower space 1a in a melted state, but in this case, the range of selection of the type of lubricating oil L or liquid refrigerant F However, it may be necessary to use expensive lubricating oil L or liquid refrigerant F in some cases, and it is hard to say that it is a good idea in terms of reducing running costs.

Therefore, in the present invention, without narrowing the selection range of the lubricating oil and the liquid refrigerant, the occurrence of the lubrication failure of the compressor at the time of restarting the apparatus can be prevented in advance, and the durability of the compressor can be ensured. It was made as an attempt to provide a hermetic compressor capable of improving the cost and reducing the running cost.

[0008]

[Means for Solving the Problems]

 As a concrete means for solving the problem in the present invention, in the invention according to claim 1, the compressor 2 and the oil pump 6 are arranged in the closed container 1 as illustrated in FIG. In the suction port 6a portion of the oil pump 6, a floating member X for floating the suction port 6a is provided corresponding to the oil layer portion of the lubricating oil L stored in the lower space 1a of the closed container 1. It has a feature.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, the floating member X is attached to a flexible hose 12 having appropriate flexibility and a tip portion of the flexible hose 12. It is characterized in that the floating body 13 is attached and has a specific gravity smaller than that of at least the liquid refrigerant F.

[0010]

[Action]

 With each of the inventions of the present application, the following actions can be obtained by adopting such a configuration.

According to the first aspect of the present invention, even when the lubricating oil L and the liquid refrigerant F are separated into upper and lower two phases in the lower space 1a of the closed container 1 when the apparatus is restarted, The height position of the suction port 6a of the oil pump 6 is substantially raised by the floating member X following the change in the rise of the oil level of the lubricating oil L due to the presence of the liquid refrigerant F, so The suction port 6a is always located in the portion of the lubricating oil L regardless of the level of the oil surface of the oil L. Therefore, when the oil pump 6 is operated when the device is restarted, the lubricating oil L is surely supplied to each lubrication part of the crankshaft 4, and good lubricity of the lubrication part is maintained. Is.

According to the second aspect of the invention, the floating member X is composed of the flexible hose 12 and the floating body 13 attached to the tip side thereof, and the floating body 13 has a specific gravity of at least that of the liquid refrigerant F. Since the setting is made small, even if the lubricating oil L and the liquid refrigerant F are separated into upper and lower two phases in the lower space 1a when the device is restarted, the buoyancy of the floating body 13 and the flexible hose By virtue of the synergistic action with the flexibility of 12, the floating body 13 (that is, the substantial suction port of the oil pump 6) is always located in the lubricating oil L portion. The lubricating oil L is reliably supplied.

[0013]

[Effect of the device]

 Therefore, according to the hermetic compressor of each invention of the present application, it is assumed that the lubricating oil L and the liquid refrigerant F are separated into upper and lower two phases in the lower space 1a of the hermetic container 1 when the apparatus is restarted. Since it is possible to reliably supply only the lubricating oil L to the lubricating parts of the compressor 2 by the oil pump 6 without being affected by this, for example, due to sucking the liquid refrigerant F at the time of restart as in the conventional case. As a result, poor lubrication does not occur, and as a result, the durability of the device can be improved by ensuring good lubricity.

Further, even if the lubricating oil L and the liquid refrigerant F are separated as described above, high lubricity can be surely secured without being affected by the separation of the lubricating oil L. When selecting L and the liquid refrigerant F, it is possible to freely select them without concern for their compatibility, for example, in terms of performance or price, which in turn contributes to improved performance or reduced running costs. The effect of being able to do so can also be expected.

[0015]

【Example】

Hereinafter, the hermetic compressor of the present invention will be described in detail based on embodiments. FIG. 1 shows a hermetic compressor Z for an air conditioner according to an embodiment of the present invention. The hermetic compressor Z of this embodiment has the same basic structure as the hermetic compressor Z ₀ of the above-described conventional structure, and therefore, here, the same parts as those shown in FIG. 2 are used. The same reference numerals are given to them to omit the description thereof, and only the structure peculiar to the present invention and its action and effect will be described in detail.

In the hermetic compressor Z of this embodiment, the lubricating oil L and the liquid refrigerant F exist in the lower space 1a below the compressor 2 in a state of being separated into upper and lower two phases while the compressor 2 is stopped. However, in order to ensure that only the lubricating oil L is sucked by the oil pump 6 and can be supplied to each lubricating portion of the crankshaft 4 when the operation is restarted, the invention of the present application is first applied. A hose support member 11 composed of a tubular body having a diameter larger than that of the oil pump 6 may be oil-tightly surrounded on the outer side of the oil pump 6 and allow rotation of the oil pump 6 inside thereof. In this way, the casing 2a of the compressor 2 is fastened and fixed to the lower end thereof. Further, one end of a flexible hose 12 of a predetermined length having appropriate flexibility is attached to the tip end (that is, the lower end) of the hose support member 11, and the other end of the flexible hose 12 is attached. A floating body 13 having a suction port 13a having a predetermined diameter is attached to the.

In this case, the specific gravity of the floating body 13 is appropriately set so as to be at least smaller than that of the liquid refrigerant F. Further, when the flexible hose 12 provided with the floating body 13 is attached to the outside of the oil pump 6 in this way, the suction position of the oil pump 6 is defined by the suction port 13a of the floating body 13 instead of the suction port 6a. The Rukoto .

According to the hermetic compressor Z configured as described above, the lubricating oil L and the liquid refrigerant F are vertically separated in the lower space 1a of the hermetic container 1 as shown in FIG. Even if the floating body 13 exists in a separated state, the floating body 13 has a specific gravity smaller than that of the liquid refrigerant F, so that the floating body 13 rises as the oil level of the lubricating oil L rises, and its suction port 1 3a is opened in the lubricating oil L. Therefore, when the operation is restarted under such a condition, regardless of the presence of the liquid refrigerant F, the oil pump 6 sucks only the lubricating oil L from the suction port 13a of the floating body 13 and removes it. Since the oil is supplied to the predetermined lubrication portion through the oil passage 41 and the oil supply holes 42 and 43, the conventional situation such as poor lubrication due to the suction of the liquid refrigerant F does not occur, and it is possible to improve the quality immediately after restart. Lubricity is ensured. For this reason, the durability of the compressor 2 is improved, which can contribute to the improvement of the durability of the hermetic compressor Z itself.

Further, as the operation time elapses, the liquid refrigerant F gradually evaporates to become a refrigerant gas and disappears from the lower space 1a. Therefore, the oil level of the lubricating oil L in the lower space 1a gradually decreases, but in this case as well, the floating body 13 descends with the decrease in the oil level (the state shown by the chain line in FIG. 1, see reference numeral 13 '. ), The inhalation of the lubricating oil L is continued.

In the above embodiment, the flexible hose 12 and the floating body 13 constitute the floating member X in the scope of claims for utility model registration.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional hermetic compressor.

[Explanation of symbols]

1 is a closed container, 2 is a compressor, 3 is a motor, 4 is a crankshaft, 5 is a stay, 6 is an oil pump, 4 is a refrigerant gas inlet,
8 is a refrigerant gas outlet, 11 is a hose support member, 12 is a flexible hose, 13 is a floating body, 31 is a stator, 32
Is a core, 41 is an oil passage, L is lubricating oil, and F is a liquid refrigerant.

Claims (2)

[Scope of utility model registration request] 1. A compressor (2) and an oil pump in a closed container (1).
(6) and the suction port of the oil pump (6)
In the portion (6a), the suction port is provided corresponding to the oil layer portion of the lubricating oil (L) stored in the lower space (1a) of the closed container (1).
A hermetic compressor provided with a floating member (X) for floating (6a). 2. The floating member (X) according to claim 1.
However, a flexible hose (12) with moderate flexibility
And a floating body (13) attached to the tip of the flexible hose (12) and having a specific gravity at least smaller than that of the liquid refrigerant (F).