KR101064374B1 - Sealed Type Compressor - Google Patents

Abstract

assignment

In the refrigeration circuit using the HC refrigerant, it is an object to provide a hermetic compressor that is safe from ignition and explosion even if the refrigerant leaks.

Resolution

The hermetic compressor 100 according to the present invention has a compression mechanism 20 and a motor 10 for driving the compression mechanism 20 in the hermetic container 1, and the crankshaft rotates by the electric motor 10. On the cylinder 16 which arranges the rolling piston 7 which fits into the eccentric shaft 6a of (6) inside, and the cylinder head 4 and the frame 5 which block the axial ends of the cylinder 16, The compression chamber constituted by Ben is divided into a high pressure chamber and a low pressure chamber by Ben to continuously compress the refrigerant, and in the hermetic compressor 100 using the HC refrigerant, the electric motor is fitted to the inner circumferential surface of the hermetic container and fixed to the outer diameter of the electric motor. It is characterized in that D / H is 0.5 or more and less than 1.6 when the inner diameter of the cylinder is D and the height of the cylinder is H.

Hermetic compressor

Description

Sealed Compressor

The present invention relates to a hermetic compressor that can be preferably used, for example, in a refrigerating device, an air conditioning device, a hot water supply device, and the like.

In a refrigeration cycle apparatus using a flammable or toxic refrigerant as a primary refrigerant and using another secondary refrigerant, in order to reduce the size of the apparatus, a compressor and a pressure reducer are connected to each other, and a main refrigerant is sealed therein. The main refrigerant circuit, the use-side heat exchanger and the use-side pump are pipe-connected, the use-side refrigerant circuit in which the use-side refrigerant is sealed, the heat source-side heat exchanger and the heat source-side pump are pipe-connected, and A heat source side refrigerant circuit in which a heat source side refrigerant is enclosed, a medium side heat exchanger connected to each of the main refrigerant circuit and the use side refrigerant circuit, and performing heat exchange between the main refrigerant and the use side refrigerant, and a main refrigerant circuit and the heat source side refrigerant. A refrigeration unit which is connected to each of the circuits and includes a heat source side intermediate heat exchanger that performs heat exchange between the main refrigerant and the heat source side refrigerant, and the use-side pump is driven by the same drive mechanism as the compressor. Cycle devices have been proposed. In this refrigeration cycle apparatus, the outer diameter of the drive mechanism is made smaller than the outer diameter of the compressor (see Patent Document 1, for example).

As a conventional hermetic compressor, a rotary compressor having a value obtained by dividing a cylinder inner diameter by a cylinder height of 1.6 to 1.7 is proposed (see Patent Document 2, for example).

Patent Document 1: Japanese Patent Laid-Open No. 2000-65431 (No. 7 page, Fig. 2)

Patent Document 2: Japanese Patent Laid-Open No. 5-302584

Natural refrigerants such as HC (hydrocarbon) refrigerant and R717 (ammonia) have attracted attention as refrigerants that have no threat to the ozone layer and have a low global warming coefficient. As HC refrigerant | coolant, there exist each single refrigerant | coolant of R170 (ethane), R1270 (propylene), R290 (propane), and R600a (isobutane), or these mixed refrigerants.

When the HC refrigerant is used in the refrigerant circuit, if the refrigerant leaks, it is flammable and there is a risk of ignition explosion. Therefore, it is preferable to reduce the amount of refrigerant enclosed in the refrigerant circuit in order to reduce the risk. As for the hermetic compressor used for a refrigeration apparatus, an air conditioning apparatus, a hot water supply apparatus, etc., the pressure in the hermetic container is a thing of the type which becomes high pressure normally. Therefore, in order to reduce the amount of refrigerant enclosed in the refrigerant circuit, it is necessary to reduce the space volume in the hermetic container of the hermetic compressor.

In the said patent document 1 made | formed in order to solve this point, there exists a subject shown below. It is necessary to drive the compressor mechanism of the main refrigerant circuit using the HC refrigerant and the heat source side pump of the heat source side refrigerant circuit with the same electric motor, and completely separate the main refrigerant circuit and the heat source side refrigerant circuit. Therefore, as shown in FIG. 2 of 7th page of the said patent document 1, the container which covers a compression mechanism part, the container which covers an electric motor, and the container which covers a heat source side pump are comprised separately, respectively. In addition, the stator and the rotor inside the motor are kept airtight by the can.

In such a configuration, the compressor mechanism and the motor are coaxial with the stator of the motor fixed to the sealed container covering the motor, and the rotor fixed to the drive shaft of the compressor mechanism freely supported by the compressor mechanism. ) Is not secured within a predetermined value, it causes abnormal vibration and abnormal noise, and in the worst case, it becomes impossible to operate. For this reason, the airtight container which covers a compression mechanism part, and the airtight container which cover an electric motor need to be manufactured by the high precision coaxial assembly technique, and there exists a subject that the productivity falls remarkably and becomes expensive.

Moreover, the rotary compressor of the said patent document 2 has the subject shown below. In conventional air conditioners, R410A refrigerant has been used as the refrigerant. If the HC refrigerant is used in place of the R410A refrigerant, when the compression mechanism portion equals the volume pushed out, the refrigeration capacity is reduced by about 10% due to the characteristics of the refrigerant. For example, if the refrigerating capacity at the time of using the R410A refrigerant is A, and if the hermetic compressor using HC refrigerant is manufactured in the same volume to push out, the refrigerating capacity is 0.9xA. In order to achieve the same freezing capacity as the conventional R410A refrigerant, it is necessary to increase the extruding volume by 10%.

In general, the compression efficiency of a hermetic compressor is proportional to the value obtained by dividing the cylinder inner diameter by the cylinder height. In other words, if the cylinder inner diameter is relatively large with respect to the cylinder height, and the flat cylinder dimension, the compression efficiency is increased. At this time, if the cylinder inner diameter and the cylinder height are designed in accordance with the prior art, the cylinder inner diameter is enlarged.

However, enlarging the inner diameter of the cylinder means enlarging the outer diameter of the cylinder, that is, the inner diameter of the sealed container covering the cylinder. Increasing the inner diameter of the hermetic container also increases the inner diameter of the bottom of the hermetic container storing the refrigeration oil supplied to the compression mechanism. Attempting to secure a constant liquid level increases the amount of refrigeration oil to be enclosed.

In general, HC refrigerant has a very high solubility with respect to the refrigeration oil currently used, and is well soluble in the refrigeration oil. Therefore, when there is much refrigeration oil in a hermetic compressor, it is necessary to encapsulate as much as the quantity of the refrigerant | coolant encapsulated and melt | dissolve in the refrigeration oil accordingly.

When the HC refrigerant is used in the refrigeration circuit, if the refrigerant leaks due to flammability, there is a risk of ignition explosion. Therefore, it is preferable to reduce the amount of refrigerant enclosed in the refrigerating circuit in order to reduce the risk. If the amount of refrigerant sealed is large, the risk of ignition and explosion increases.

In addition, when the hermetic compressor is discarded, it is dismantled and classified and recycled into iron, aluminum, copper, etc., but the refrigeration oil is disposed of because there is no reuse purpose. Therefore, when there is much refrigeration oil enclosed, the refrigeration oil discarded also increases, and the influence on the environment becomes strong.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and by reducing the amount of encapsulated refrigerant used in a refrigeration circuit using HC refrigerant, there is little risk of ignition or explosion even if the refrigerant leaks. To provide a safe, hermetic compressor.

The hermetic compressor according to the present invention has a compression mechanism portion for compressing a refrigerant and an electric motor for driving the compression mechanism portion in a hermetic container, and includes a rolling piston fitted to an eccentric shaft of a crankshaft rotated by an electric motor therein. In a hermetic compressor using a HC refrigerant by continuously compressing a compression chamber constituted by a cylinder and a cylinder head and a frame closing the axial ends of the cylinder into a high pressure chamber and a low pressure chamber by Ben. The motor is fitted to the inner circumferential surface of the airtight container and is fixed. When the outer diameter of the motor is smaller than the outer diameter of the compression mechanism, the inner diameter of the cylinder is D and the height of the cylinder is H. It features.

The hermetic compressor according to the present invention can reduce the amount of refrigerant encapsulated by making the outer diameter of the electric motor smaller than the outer diameter of the compression mechanism, and if the HC refrigerant leaks, there is little risk of ignition and explosion. Can be provided. In addition, when the inner diameter of the cylinder is D and the height of the cylinder is H, the D / H is 0.5 or more and less than 1.6, so that even when the pushing volume is enlarged, the cylinder is elongated without expanding the inner diameter of the cylinder. Since the inner diameter is not expanded and the shell inner diameter is not expanded, the amount of the refrigerant to be sealed is small and the refrigerator oil to be sealed is small. Therefore, even if the HC refrigerant leaks, there is less risk of ignition and explosion, and a hermetic compressor can be obtained in which the impact on the environment at the time of disassembly is reduced.

Embodiment 1.

1 and 2 show a first embodiment, FIG. 1 is a longitudinal sectional view schematically showing the hermetic compressor 100, and FIG. 2 is a longitudinal sectional view of a main part of the hermetic compressor 100. As shown in FIG.

The configuration of the hermetic compressor 100 will be described with reference to FIG. 1. The hermetic compressor 100 will be described using a rotary compressor as an example. However, in addition to a rotary compressor, it is applicable also to a scroll compressor. The hermetic compressor 100 houses the compression mechanism 20 and the electric motor 10 for driving the compression mechanism 20 in the sealed container 1.

The electric motor 10 is provided with the stator 2 and the rotor 3 which rotates inside this stator 2. Electric power is supplied to the stator 2 from the glass terminal 30. As the electric motor 10, a brushless DC motor, an induction motor, etc. are used normally.

The compression mechanism 20 has a cylinder 16, the outer peripheral portion of which is fixed to the inner wall of the sealed container (1). Inside the cylinder 16, there is a space in which both axial end surfaces are opened, and the rolling piston 7 is accommodated in this space. The rolling piston 7 eccentrically rotates the inside of the cylinder 16 by fitting to the eccentric shaft 6a of the crankshaft 6.

One opening (motor 10 side) of the cylinder 16 is closed by the frame 5. The frame 5 is also called an upper bearing, and supports the crankshaft 6.

The other opening of the cylinder 16 is closed by the cylinder head 4. The cylinder head 4 is also called a lower bearing and supports the crankshaft 6.

A ben (not shown) is slid freely assembled into a groove (not shown) of the cylinder 16 and always abuts against the outer circumference of the rolling piston 7 to divide the inside of the compression chamber into a high pressure side and a low pressure side.

The refrigeration oil 40 is stored at the bottom of the sealed container 1, and is led to the inside of the rolling piston 7 via the inside of the crankshaft 6.

In addition, the suction muffler 22 is fixed to the outside of the sealed container 1. The refrigerant gas (low pressure, low temperature) from the refrigerant circuit (not shown) is sucked from the suction pipe 23 provided above the suction muffler 22. Suction gas is supplied to the compression chamber of the compression mechanism part 20 via the lower connection pipe 24 provided in the lower end of the suction muffler 22.

The high temperature and high pressure discharge gas compressed by the compression mechanism 20 is discharged into the sealed container 1, passes through the electric motor 10, and exits from the discharge tube 25 to the refrigerant circuit (not shown).

Here, the relationship between the cylinder inner diameter D, the cylinder height H, and compression efficiency is demonstrated. The compression efficiency of the hermetic compressor 100, that is, the ratio of the actual refrigerating capacity to the theoretical refrigerating capacity, is the amount of refrigerant gas leaking from the high pressure side to the low pressure side in the compression process of the hermetic compressor 100. It decreases because the actual freezing capacity decreases. The amount of refrigerant leaked from the high pressure side to the low pressure side in this compression step is proportional to the cylinder height.

That is, when the cylinder height is lowered, the flow path area leaking from the high pressure side to the low pressure side decreases accordingly, so that the decrease in the freezing capacity is alleviated. For this reason, in the conventional compressor, the value obtained by dividing the cylinder inner diameter D by the cylinder height H is often set to 1.6 or more.

Therefore, the cylinder internal diameter D becomes large and the internal diameter of the bottom part of the sealed container 1 which stores the refrigeration oil 40 supplied to the compression mechanism part 20 also becomes large. Attempting to secure a constant level of liquid level increases the amount of refrigeration oil to be enclosed.

In general, the HC refrigerant has a very high solubility with respect to the refrigerator oil 40 currently used, and is well dissolved in the refrigerator oil 40. Therefore, if there is a lot of refrigeration oil 40 in the hermetic compressor 100, it is necessary to encapsulate as much as the amount of refrigerant to be sealed and the amount dissolved in the refrigeration oil 40 accordingly.

When the HC refrigerant is used in the refrigeration circuit, when the refrigerant leaks, there is a risk of flammable explosion due to flammability. Therefore, it is preferable to reduce the amount of refrigerant encapsulated in the refrigerating circuit in order to reduce the risk. If the amount of refrigerant encapsulated is large, the risk of ignition and explosion increases.

In addition, when the hermetic compressor 100 is discarded, it is dismantled and classified and recycled into iron, aluminum, copper, etc., but the refrigeration oil 40 is discarded because there is no reuse purpose. Therefore, when the refrigeration oil 40 is enclosed much, the refrigeration oil 40 discarded also increases, and the influence on the environment becomes strong.

In this embodiment, in order to prevent this incompatibility, since the value D / H obtained by dividing the inner diameter D of the cylinder 16 by the height of the cylinder 16 is set to 0.5 or more and less than 1.6, the cylinder ( 16 has an elongated shape, and the cylinder inner diameter D does not increase, and therefore the inner diameter of the sealed container 1 does not increase.

As described above, according to the present embodiment, the value D / H obtained by dividing the inner diameter D of the cylinder 16 by the height of the cylinder 16 is set to 0.5 or more and less than 1.6. Therefore, even when the pushing-out volume of the hermetic compressor 100 is enlarged, since the inner diameter D of the hermetic container 1 is elongated without enlarging the cylinder inner diameter D, the inner diameter of the hermetic container 1 is not enlarged. The amount of refrigerant is small, and the refrigerant oil encapsulated is small. Therefore, even if the refrigerant leaks, there is a low risk of ignition and explosion, and there is an effect that it is possible to obtain the hermetic compressor 100 having a reduced impact on the environment during disassembly.

Embodiment 2:

FIG. 3 is a diagram showing Embodiment 2 and is a longitudinal sectional view schematically showing the hermetic compressor 100.

The structure of the hermetic compressor 100 shown in FIG. 3 is the same as the hermetic compressor 100 of FIG. 1 except the following point.

(1) The outer diameter Dm of the electric motor 10 is made smaller than the outer diameter Dc of the compression mechanism 20.

(2) In connection with this, the inner diameter of the portion 1a covering the electric motor 10 of the hermetic container 1 is smaller than the inner diameter of the portion 1b covering the compression mechanism 20 of the hermetic container 1.

The electric motor 10 is fitted and fixed to the inner circumference of the airtight container 1 by heating and fitting.

Here, the output of the electric motor 10 of the hermetic compressor 100 is demonstrated. In the conventional hermetic compressor 100, even if the refrigerant changes due to the constraints of the production equipment, the same compression mechanism 20 and the electric motor 10 are often used.

Conventionally, in air conditioners, R410A refrigerant has been used. If the HC refrigerant is used in place of the R410A refrigerant, the refrigerating capacity is reduced by about 10% due to the characteristics of the refrigerant when the pushing volume of the compression mechanism 20 is equal. Here, the pushing volume is a geometric volume pushed out by the hermetic compressor 100 per revolution.

For example, if the output of the motor 10 when the R410A refrigerant was used is A, then if the hermetic compressor 100 using the HC refrigerant is manufactured in the same volume to push out, the motor 10 will be at that time. The output which needs to generate | occur | produce should just be 0.9xA which reduced 10% of conventional things, and the difference 0.1xA becomes a surplus.

In order to reduce the surplus of the output of this electric motor 10, the outer diameter Dm of the electric motor 10 is reduced, and smaller than the outer diameter Dc of the compression mechanism part 20. FIG. That is, the outer diameter of the core 2a used by the electric motor 10 is made small, the volume is reduced, and the output of the electric motor 10 is adjusted. In this case, the axial length (core width) of the core 2a is made constant.

It is assumed that the output of the electric motor 10 is proportional to the volume of the core 2a (total of the stator and the rotor). Since the core width is constant, when the output which the motor 10 needs to generate | occur | produce is 0.9xA which reduced 10% of the conventional thing, the outer diameter of the electric motor 10 can be made small as (√0.9 ≒ 0.95Dm). Since the outer diameter of the electric motor 10 is the same as the inner diameter of the hermetically sealed container 1 of the part which covers the electric motor 10, the inner diameter of the hermetically sealed container 1 of the part which covers the electric motor 10 can also be made small about 5%. . By doing so, the internal volume of the sealed container 1 is reduced.

As the internal space volume of the sealed container 1 becomes smaller, the space of the high pressure is reduced, and the amount of refrigerant encapsulated in the refrigerating circuit can be reduced.

As mentioned above, according to Embodiment 2, it has the following effects. That is, since the outer diameter Dm of the electric motor 10 is made small with respect to the outer diameter Dc of the compression mechanism part 20, the space volume inside the airtight container 1 can be made small, and the amount of refrigerant | coolant sealed can be reduced. Can be. Therefore, even when using a flammable refrigerant, even if the refrigerant leaks, there is little risk of ignition and explosion, and there is an effect that a safe hermetic compressor 100 can be obtained.

In the said patent document 1, as shown in FIG. 2 of 7th page, the container which covers a compression mechanism part, the container which covers an electric motor, and the container which covers a heat source side pump are comprised separately, respectively. Moreover, the stator is isolate | separated by the can inside the electric motor. The main refrigerant which is flammable or toxic does not exist in the part of a stator. Therefore, even if the electric motor is made small, the amount of the main refrigerant having flammability or toxicity cannot be reduced.

Embodiment 3.

In Embodiment 2, although the outer diameter Dm of the electric motor 10 was made small with respect to the outer diameter Dc of the compression mechanism part 20, in this embodiment, in order to reduce the excess of the output of the electric motor 10, The width (axial length) of the core 2a of the electric motor 10 is made small with respect to the width of the core 2a of the electric motor 10 which has been set for a conventional refrigerant such as R410A, for example. The output of the electric motor 10 is adjusted by reducing the volume of the core 2a to be used. In connection with this, the height of the airtight container 1 which covers the electric motor 10 is also made low. By doing so, the internal volume of the sealed container 1 is reduced.

It is assumed that the output of the electric motor 10 is proportional to the volume of the core 2a (total of the stator and the rotor). The outer diameter of the electric motor 10 is made constant. Since the outer diameter of the electric motor 10 is constant, when the output which the electric motor 10 needs to generate | occur | produce is 0.9xA which the conventional 10% reduced, the core width H of the electric motor 10 can also be made small as 0.9H. have.

As the internal space volume of the sealed container 1 becomes smaller, the space of the high pressure is reduced, and the amount of refrigerant encapsulated in the refrigerating circuit can be reduced.

Thus, according to this embodiment, it has the following effects. That is, since the width of the core 2a of the electric motor 10 is made small with respect to the width of the core 2a of the electric motor 10 set with respect to the conventional refrigerant | coolant, such as R410A, for example, the sealed container 1 By reducing the internal space volume and reducing the amount of encapsulated refrigerant, even if a flammable refrigerant is used, there is little risk of ignition and explosion even if the refrigerant leaks, and a safe hermetic compressor 100 can be obtained. It works.

Moreover, it is also possible to comprise the hermetic compressor 100 by combining Embodiment 1, 2, 3 suitably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1: is a figure which shows Embodiment 1, and is a longitudinal cross-sectional view which shows schematically the hermetic compressor 100. FIG.

FIG. 2 is a diagram showing a first embodiment, the longitudinal cross-sectional view of main parts of the hermetic compressor 100. FIG.

FIG. 3 is a diagram showing Embodiment 2, and is a longitudinal sectional view schematically showing the hermetic compressor 100. FIG.

(Explanation of symbols for the main parts of the drawing)

1: airtight container

1a: part covering electric motor 10 of airtight container 1

1b: part covering the compression mechanism 20 of the hermetic container 1

2: stator

2a: core

3: rotor

4: cylinder head

5: frame

6: crankshaft

6a: eccentric shaft

7: rolling piston

16: cylinder

20: compressor section

22: suction muffler

23: suction pipe

24: lower connection pipe

25: discharge tube

30: glass terminal

40: refrigerator oil

100: hermetic compressor

Claims (1)

In one hermetically sealed container, there is a compressor mechanism portion for compressing a refrigerant to be discharged into the hermetic container, and an electric motor for driving the compressor mechanism portion and passing the refrigerant discharged from the compressor sphere into the hermetic container before exiting the hermetic container. , A compression chamber constituted by a cylinder for arranging a rolling piston fitted therein with an eccentric shaft of a crankshaft rotated by the electric motor, and a cylinder head and a frame closing the axial ends of the cylinder, a high pressure chamber by Ben. In a hermetic compressor, which is divided into a low pressure chamber and continuously compresses a refrigerant, and uses an HC (hydrocarbon) refrigerant, The electric motor is fixed to the inner peripheral surface of the hermetic container, The outer diameter of the electric motor is made smaller than the outer diameter of the compressor sphere so that the inner diameter of the portion covering the motor of the sealed container is smaller than the inner diameter of the portion covering the compressor sphere of the sealed container, When the inner diameter of the cylinder is D and the height of the cylinder is H, D / H is 0.5 or more and less than 1.6, characterized in that the hermetic compressor.

Images