JP2012145307A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor capable of minimizing a pressure loss of coolant gas when the coolant gas passes through a suction accumulator and, thereby improving the efficiency of the suction of the coolant gas.SOLUTION: The hermetic compressor 100 is characterized in that a suction accumulator 1 has the following elements: (1) an inflow pipe 2 being a straight pipe having a constant inside diameter to which a coolant pipe of a refrigeration cycle is connected; (2) a barrel 5 which has such a shape that the whole is cylindrical and both ends are narrowed, is configured in a prescribed diameter that gives such a volume to satisfy gas-liquid separation of suction coolant gas and function of storing liquid coolant containing separated refrigerator oil, and configured in such a diffuser shape that the end part of the inflow pipe side has a prescribed deployment angle, a diffuser shaped part 6 smoothly formed with an inwardly-convex curve and connected to the inflow pipe; and (3) at least one outflow pipe 3 in which the diameter of inflow port is larger than the diameter of the inflow pipe or the inflow port 7-1 is a bell mouth shape.

Description

  The present invention relates to a hermetic compressor. Specifically, it relates to suppression of pressure loss in the suction accumulator.

  Conventionally, in order to secure a volume for storing liquid refrigerant including gas-liquid separation of the refrigerant refrigerant and separated refrigerating machine oil, hermetic compression in which an outflow pipe and an inflow pipe are inserted into the body to reach the inside of the body A suction accumulator for a machine has been proposed (see, for example, Patent Document 1).

JP2009-162222A (FIG. 8)

A suction accumulator provided in a conventional hermetic compressor and having a function of storing a liquid containing gas and liquid separation of suction refrigerant gas and separated refrigeration oil has a body volume and an air conditioner main body that can satisfy the functions. Since it is restricted by the pipe diameter and the diameter of the compression chamber suction engagement portion of the compressor, there are the following problems.
(1) The refrigerant gas that passes through the suction accumulator body from the inflow pipe provided in the suction accumulator, flows into the outflow pipe provided in the suction accumulator, and is sucked from the compression chamber suction engagement portion of the compressor, The sudden expansion loss when flowing from the inflow pipe into the suction accumulator body becomes very large.
(2) The sudden contraction loss of the refrigerant gas when passing through the suction accumulator body and flowing into the outflow pipe becomes very large.

  For this reason, the refrigerant gas suction efficiency is reduced, the pressure of the refrigerant gas sucked into the compressor is lowered, and the compression work is increased as compared with the ideal pressure state of the refrigeration cycle. Thereby, the compressor efficiency is lowered, and further, the pressure of the evaporator provided in the air conditioner main body is lowered, leading to a reduction in the refrigeration cycle efficiency.

  The present invention has been made to solve the above-described problems, and can improve the refrigerant gas suction efficiency by minimizing the pressure loss of the refrigerant gas when the refrigerant gas passes through the suction accumulator. A hermetic compressor is provided.

A hermetic compressor according to the present invention is a hermetic compressor including a suction accumulator on a side of a hermetic container,
The inhalation accumulator includes the following elements.
(1) An inflow pipe having a constant inner diameter and connected to a refrigerant pipe of a refrigeration cycle;
(2) The overall shape is cylindrical and both ends are squeezed, and is configured to have a predetermined diameter having a volume satisfying the function of storing liquid refrigerant including gas-liquid separation of suction refrigerant gas and separated refrigeration oil, A body portion that is configured to have a diffuser shape with a predetermined deployment angle at the end portion on the inflow pipe side, and the diffuser shape portion is smoothly formed with an inward convex curve and connected to the inflow pipe;
(3) At least one outflow pipe in which the diameter of the inflow port is larger than the diameter of the inflow pipe or the inflow port has a bell mouth shape.

  In the hermetic compressor according to the present invention, the inflow pipe of the suction accumulator is configured in a diffuser shape with a predetermined deployment angle at the end on the inflow pipe side, and the diffuser shape portion is smoothly formed with a convex curve inward. The refrigerant gas is provided with a suction accumulator by connecting at least one outflow pipe having a diameter larger than that of the inflow pipe or having a bell mouth shape. The refrigerant gas suction efficiency is improved by minimizing the pressure loss of the refrigerant gas when passing through. Furthermore, the pressure of the refrigerant gas sucked into the hermetic compressor is increased, and the compression work is close to the ideal pressure state of the refrigeration cycle, so that the compressor efficiency is improved and the evaporator pressure of the refrigeration cycle is also improved This has the effect of improving the refrigeration cycle efficiency.

FIG. 3 shows the first embodiment and is a longitudinal sectional view showing the overall configuration of the hermetic compressor 100. FIG. FIG. 3 shows the first embodiment, and shows a part of the suction accumulator 1 in cross section. The A section enlarged view of FIG. FIG. 5 shows the first embodiment, and shows a cross section of a part of a modified inhalation accumulator 1-1. FIG. 5 shows the first embodiment, and shows a relationship between a deployment angle and a pressure loss in a gently expanding pipe. FIG. 5 shows the first embodiment and shows the relationship between the outflow pipe diameter and the pressure loss. FIG. 3 shows the first embodiment, and is a refrigerant circuit diagram of the air conditioner. FIG. 3 is a diagram illustrating the first embodiment and is an exploded perspective view of the outdoor unit 300 of the air conditioner. It is a figure shown for a comparison and is a longitudinal cross-sectional view which shows the whole structure of the general hermetic compressor 200. It is a figure shown for a comparison and is a figure which shows a part of the suction accumulator 21 of a general hermetic compressor 200 in cross section.

Embodiment 1 FIG.
The hermetic compressor of the present embodiment has a function of storing liquid refrigerant including gas-liquid separation of suction refrigerant gas and separated refrigeration oil from an inflow pipe constituted by a straight pipe connected to the air conditioner body. A suction accumulator body of any diameter with a satisfactory volume is connected to a deployment angle having a diffuser effect and a smooth curved shape convex inward, the inlet is preferably enlarged, and the compression chamber inlet of the compression element A suction accumulator having at least one outflow pipe contracted by the engaging portion is provided.

  Further, the hermetic compressor according to the present embodiment has an inflow pipe connected to the air conditioner main body for minimizing pressure loss while regulating the position of the refrigerant pipe connected from the air conditioner main body. It is a straight pipe provided with one protrusion shape (stopper) facing toward. The expansion angle having a diffuser effect and the smooth curved shape convex inward have a expansion angle of 10 ° to 60 ° from the inlet pipe outlet portion in order to minimize the expansion loss of the refrigerant gas passing therethrough. Smoothly connected to the body. Refrigerant gas that has passed through a smooth curved shape that protrudes inward minimizes the contraction loss when flowing into the inlet of the suction accumulator outlet pipe, and stores liquid refrigerant containing frozen gas oil that has separated the suction refrigerant gas. In order to satisfy the function, the inlet outer diameter of the suction accumulator outlet pipe is larger than the inlet accumulator inlet pipe diameter, and the diameter of the inlet inlet of the suction accumulator outlet pipe is adapted to the compression chamber suction port engaging portion. A hermetic compressor having a suction accumulator having at least one outflow pipe reduced in diameter at least at one place.

  Further, in the hermetic compressor of the present embodiment, the tip (inlet) of the outflow pipe provided in at least one suction accumulator minimizes the sudden contraction loss when the refrigerant gas flows into the outflow pipe. A bell mouth-shaped inlet may be used, and the bell mouth shape has an outer diameter larger than the inlet accumulator inlet pipe diameter.

  FIG. 1 shows the first embodiment, and is a longitudinal sectional view showing the overall configuration of the hermetic compressor 100. The hermetic compressor 100 will be described with reference to FIG.

  A hermetic compressor 100 shown in FIG. 1 is a one-cylinder rotary compressor. In the hermetic compressor 100, a compression element 101 that compresses a refrigerant and an electric element 102 that drives the compression element 101 are housed in a hermetic container 110, and the sliding portion of the compression element 101 is lubricated at the bottom of the hermetic container 110. Refrigerating machine oil is stored.

  In the compression element 101 that compresses the refrigerant, a rolling piston that fits in an eccentric portion of the rotating shaft rotates in a cylinder in which both ends in the axial direction are closed by two upper and lower bearings. In the cylinder, a vane provided so as to be movable forward and backward in the radial direction is arranged so as to always contact the rolling piston. The refrigerant is compressed in a compression chamber surrounded by the inner peripheral surface of the cylinder, the outer peripheral surface of the rolling piston, the vane, and the two bearings.

  A brushless DC motor, an induction motor, or the like is used for the electric element 102 that drives the compression element 101 via a rotating shaft.

  The refrigerant compressed by the compression element 101 is discharged into the sealed container 110, passes through the electric element 102, and flows out from the discharge pipe 130 to the high pressure side of the refrigerant circuit (not shown).

  Electric power is supplied to the electric element 102 from a commercial power source through a glass terminal 120 fixed to the sealed container 110.

  The hermetic compressor 100 includes a suction accumulator 1 on a side portion thereof. This embodiment is characterized by the structure of the suction accumulator 1. Therefore, the suction accumulator 1 will be described in detail below.

  FIG. 2 is a diagram showing the first embodiment, and is a diagram showing a part of the suction accumulator 1 in cross section, and FIG. 3 is an enlarged view of a portion A in FIG. The suction accumulator 1 will be described with reference to FIGS.

The suction accumulator 1 includes the following elements.
(1) Body part 5: The whole body is cylindrical (for example, the cross section is circular), and both ends are narrowed. The body portion 5 is configured to have an arbitrary diameter having a volume that satisfies the function of gas-liquid separation of the suction refrigerant gas and the storage of the liquid refrigerant including the separated refrigerating machine oil. An end portion on the inflow pipe 2 side, which will be described later, of the body portion 5 has a diffuser shape. In a diffusion cylinder that is a tube having a gradually increasing cross-sectional area, at subsonic speeds (M <1, M is the Mach number), the velocity and the Mach number are decreased, and the pressure is increased. Such a tube is called a diffuser. Furthermore, the diffuser-shaped portion 6 of the body portion 5 of the present embodiment is smoothly formed with an inwardly convex curve (for example, an arc). The expansion angle (see FIG. 2) of the diffuser-shaped portion 6 is described later in detail, but is preferably 10 to 60 °. The development angle represents the spread of the cross-sectional area. When the cross-sectional area does not change, it is 0 °. Further, when the cross-sectional area suddenly expands when flowing into the body portion from the inflow pipe as in the general suction accumulator 21 shown in FIG. 10, the deployment angle is approximately 180 °.

(2) Inflow pipe 2: A straight pipe having a constant inner diameter, to which a refrigerant pipe of a unit (for example, an outdoor unit of an air conditioner) is connected. A diffuser-shaped portion 6 (a deployment angle (10 ° to 60 °) having a diffuser effect and a smooth curve (for example, an arc) inwardly convex) having a diffuser effect is smoothly connected from the inflow pipe 2 to the body portion 5. The inflow pipe 2 includes at least one protrusion-shaped portion 2a that protrudes inward. The protrusion-shaped portion 2a can minimize the pressure loss when the refrigerant gas passes through the inflow pipe 2 while satisfying that the refrigerant piping of the unit (for example, the outdoor unit of the air conditioner) is regulated (positioned). The inflow pipe of the general suction accumulator 21 (see FIG. 10) restricts the position of the refrigerant pipe of the unit by restricting a part of the straight pipe (thinning the diameter), so that the refrigerant gas passes through the inflow pipe. There is a pressure loss of.

(3) Outflow pipe 3: The outflow part 8 of the outflow pipe 3 of the suction accumulator 1 has a diameter (contracted) so as to fit the compression chamber suction port engaging part 4 of the hermetic compressor 100. In the outflow pipe 3, an oil return hole 10 for returning the refrigeration oil to the hermetic compressor 100 is formed in the lower part of the body part 5. The diameter of the inlet 7 of the outflow pipe 3 is larger than the diameter of the inflow pipe 2.

(4) Ring member 9: The ring member 9 is fitted to the substantially central part of the body part 5 and has the effect of increasing the strength of the body part 5, and also has the role of fixing the suction accumulator 1 to the sealed container 110.

  The hermetic compressor 100 is mounted on, for example, an outdoor unit of an air conditioner main body, and is evaporated in a heat exchanger (outdoor heat exchanger (during heating) or indoor heat exchanger (during cooling)) to be in a gas state. A pipe (unit pipe) through which the refrigerant gas flows is connected to the inflow pipe 2 of the suction accumulator 1 attached to the side surface of the hermetic compressor 100 (see FIG. 3).

  An example of an air conditioner will be described with reference to FIGS.

  7 and 8 show the first embodiment, FIG. 7 is a refrigerant circuit diagram of the air conditioner, and FIG. 8 is an exploded perspective view of the outdoor unit 300 of the air conditioner.

  As shown in FIG. 7, the refrigerant circuit of the air conditioner includes a hermetic compressor 100 that compresses the refrigerant, a four-way valve 52 that switches a refrigerant flow direction between the cooling operation and the heating operation, a condenser and a heating device during the cooling operation. An outdoor heat exchanger 53 that operates as an evaporator during operation, a decompression device 54 (electronically controlled expansion valve) that depressurizes high-pressure liquid refrigerant into a low-pressure gas-liquid two-phase refrigerant, an evaporator during cooling operation, During the heating operation, the indoor heat exchanger 55 operating as a condenser is sequentially connected to constitute a refrigeration cycle.

  The solid line arrows in FIG. 7 indicate the direction in which the refrigerant flows during the cooling operation. Moreover, the broken line arrow of FIG. 7 shows the direction through which the refrigerant flows during the heating operation.

  The outdoor heat exchanger 53 is provided with an outdoor fan 56, and the indoor heat exchanger 55 is provided with an indoor fan 57 (cross flow fan).

  During the cooling operation, the high-temperature and high-pressure refrigerant compressed from the hermetic compressor 100 is discharged and flows into the outdoor heat exchanger 53 via the four-way valve 52. In the outdoor heat exchanger 53, outdoor air is exchanged with the refrigerant while the outdoor air passes between the fins of the outdoor heat exchanger 53 and the tubes (heat transfer tubes) by the outdoor fan 56 provided in the air passage. The refrigerant is cooled to a high pressure liquid state, and the outdoor heat exchanger 53 functions as a condenser. Thereafter, the pressure is reduced through the decompression device 54, becomes a low-pressure gas-liquid two-phase refrigerant, and flows into the indoor heat exchanger 55. In the indoor side heat exchanger 55, the indoor air passes through between the fins and the tubes (heat transfer tubes) of the indoor side heat exchanger 55 by driving of the indoor side blower 57 (cross flow fan) attached to the air passage. By exchanging heat, the air blown into the indoor space is cooled, while the refrigerant receives heat from the air and evaporates into a gaseous state (the indoor heat exchanger 55 acts as an evaporator), and the refrigerant is then sealed. Return to the mold compressor 100. The indoor space is air-conditioned (cooled) by the air cooled by the indoor heat exchanger 55.

  Further, during the heating operation, the four-way valve 52 is inverted, so that the refrigerant flows in the opposite direction to the refrigerant flow during the cooling operation in the refrigeration cycle, and the indoor heat exchanger 55 serves as a condenser to perform outdoor heat exchange. Vessel 53 acts as an evaporator. The indoor space is air-conditioned (heated) by the air heated by the indoor heat exchanger 55.

  The structure of the outdoor unit 300 of an air conditioner will be described with reference to FIG. The outdoor unit 300 of the air conditioner includes a substantially L-shaped outdoor heat exchanger 53 in a plan view, a bottom plate 68 (base) that forms the bottom of the casing of the outdoor unit 300, and a flat plate that forms the top surface of the casing. Top panel 59, a front panel 60 that is substantially L-shaped in plan view that constitutes the front and one side of the housing, a side panel 61 that constitutes the other side of the housing, an air passage (blower room), and a machine Air is sent to the separator 62 that separates the chamber, the electrical box 63 that stores electrical components, the hermetic compressor 100 that compresses the refrigerant, the refrigerant piping and refrigerant circuit components 64 that form the refrigerant circuit, and the outdoor heat exchanger 53. The outdoor blower 56 etc. to perform are comprised.

  By mounting the hermetic compressor 100 of the present embodiment on the outdoor unit 300 of the air conditioner configured as described above, the compressor efficiency is improved by making the compression work close to the ideal pressure state of the refrigeration cycle. Further, the pressure of the evaporator provided in the air conditioner main body is improved, and the refrigeration cycle efficiency is improved.

  The refrigerant gas passes through the inside of the suction accumulator 1 from the inflow pipe 2 of the suction accumulator 1, passes through the outflow pipe 3 of the suction accumulator, and enters the hermetic compressor 100 from the compression chamber suction port engaging portion 4 of the hermetic compressor 100. Flow into. Further, it is adiabatically compressed in the compression chamber of the hermetic compressor 100 and discharged from the upper discharge pipe 130 connected to the air conditioner main body of the hermetic compressor 100. The discharged refrigerant gas is condensed (outdoor heat exchanger (cooling)) and evaporated (indoor heat exchanger (heating)) by heat exchange with ambient air in the heat exchanger inside the air conditioner body, and again The cycle of flowing in from the inflow pipe 2 of the suction accumulator 1 provided on the side surface of the hermetic compressor 100 is repeated.

  In addition, the refrigerant flowing into the suction accumulator 1 is not completely evaporated in the heat exchanger, and the refrigerating machine oil necessary for lubricating the mechanical parts (sliding parts) of the compression element 101 stored in the hermetic compressor 100. Is mixed with the refrigerant and discharged in the adiabatic compression step, so that the gas refrigerant, the liquid refrigerant, and the refrigerating machine oil are mixed.

  When a large amount of liquid refrigerant component in the mixed fluid in which gas refrigerant, liquid refrigerant, and refrigeration oil are mixed flows into the compression chamber of the hermetic compressor 100, the liquid refrigerant component adheres to the mechanical component (sliding component) of the compression element 101. The refrigerating machine oil that has been melted into the liquid refrigerant will impair normal lubrication of the mechanical parts (sliding parts) of the compression element 101.

  For this purpose, the hermetic compressor 100 is provided with a suction accumulator 1 on its side surface. The suction accumulator 1 separates the mixed fluid of gas refrigerant, liquid refrigerant, and refrigeration oil that has flowed into the interior into gas refrigerant, liquid refrigerant, and refrigeration oil. The gas refrigerant flows into the hermetic compressor 100 main body through the outflow pipe 3 of the suction accumulator 1. Liquid refrigerant / refrigeration oil is stored in the body portion 5 of the suction accumulator 1, thereby preventing a large amount of liquid refrigerant component from flowing into the compression chamber of the hermetic compressor 100.

  Further, since the stored refrigeration oil has a higher density than the liquid refrigerant and stays in the lower part, only the refrigeration oil gradually enters the main body of the hermetic compressor 100 through the oil return hole 10 at the lower part of the outflow pipe 3 of the suction accumulator 1. Inflow. The stored liquid refrigerant is gradually vaporized and stays in the upper part of the suction accumulator 1, and therefore flows into the outflow pipe 3 of the suction accumulator 1.

  The suction accumulator 1 is an arbitrary volume having a volume satisfying the function of storing the liquid refrigerant including the gas-liquid separation of the suction refrigerant gas and the separated refrigerating machine oil from the inflow pipe 2 which is a straight pipe connected to the air conditioner body. The body portion 5 of the suction accumulator 1 having a diameter is smoothly connected with a deployment angle having a diffuser effect and an inwardly convex curve (for example, an arc).

  The suction accumulator 1 includes at least one outflow pipe 3 having a diameter of the inflow port 7 larger than that of the inflow pipe 2 and having a contracted outflow portion 8 that engages with the compression chamber suction port engaging portion 4.

  The inflow pipe 2 connected to the air conditioner body (unit refrigerant pipe) is a straight pipe in order to minimize pressure loss. The diffuser-shaped portion 6 having a spread angle having a diffuser effect and a curved curve (for example, an arc) on the inside minimizes the expansion loss of the refrigerant gas passing therethrough. In addition, in order to form a positive flow toward the outer diameter direction of the body portion 5 and to make gas-liquid separation more efficient, the body portion 5 has a deployment angle of 10 ° to 60 ° from the outlet portion of the inflow pipe 2. It is connected smoothly. Minimizes contraction loss when refrigerant gas that has passed through the diffuser-shaped portion 6 having an inwardly convex curve (for example, an arc) flows into the inlet 7 of the outlet pipe 3 of the suction accumulator 1, and separates the refrigerant refrigerant In order to satisfy the function of storing the liquid refrigerant containing the refrigerating machine oil, the inflow port 7 of the outflow pipe 3 has an outer diameter larger than the diameter of the inflow pipe 2. The outflow pipe 3 has a diameter that matches the compression chamber suction port engagement portion 4 from the diameter of the inflow port 7 of the outflow tube 3, and the compression chamber suction port engagement portion 4 at the opposite end of the inflow port 7. It is contracted in at least one place of the outflow part 8 which engages. The suction accumulator 1 includes at least one outflow pipe 3.

  FIG. 4 is a diagram showing the first embodiment, and is a diagram showing a part of a suction accumulator 1-1 according to a modified example in cross section. The suction accumulator 1-1 of the modification is different from the suction accumulator 1 shown in FIG. 2 only in the outflow pipe 3-1, and the others are the same. In the outflow pipe 3-1 of the suction accumulator 1-1 of the modified example, the inflow port 7-1 has a bell mouth shape. By making the inlet 7-1 of the outflow pipe 3-1 into a bell mouth shape, the gas refrigerant component flows into the outflow pipe 3-1 without impairing the smooth flow.

  Next, the operation will be described. In the suction accumulators 1, 1-1 according to the present embodiment, the refrigerant gas flowing from the air conditioner body into the suction accumulator 1 provided in the hermetic compressor 100 flows into the suction accumulator 1 by the above configuration. Smoothly connected from the pipe 2 to the body portion 5 of the suction accumulator 1 by a diffuser-shaped portion 6 having a spread angle having a diffuser effect and a convex curve (for example, an arc) on the inside, while minimizing the separation of the refrigerant gas flow pass.

  Further, since the positive flow toward the outer diameter side of the body portion 5 of the suction accumulator 1 can be performed, the gas-liquid separation of the suction refrigerant gas is performed efficiently. The liquid refrigerant component including the refrigerating machine oil is stored in the lower part of the body part 5 of the suction accumulator 1 along the outer diameter side of the body part 5 of the suction accumulator 1. The gas refrigerant component forms a flow toward the inlet 7 of the outflow pipe 3 provided in the suction accumulator 1 while maintaining a smooth flow.

  Further, the inflow port 7 of the outflow pipe 3 provided in the suction accumulator 1 has a circular shape or a bell mouth shape having an outer diameter larger than the diameter of the inflow pipe 2. Therefore, the gas refrigerant component flows into the outflow pipe 3 without impairing the smooth flow. The inside of the outflow pipe 3 is reduced in diameter so that the friction loss of the pipe is minimized and the outflow portion 8 of the outflow pipe 3 is fitted to the compression chamber suction port engaging portion 4 of the hermetic compressor 100. Therefore, the smooth flow of the refrigerant gas is maintained and flows into the compression chamber suction port engaging portion 4 of the hermetic compressor 100.

  The inflow pipe 2 that is a straight pipe provided in the suction accumulator 1 is provided with at least one protrusion-shaped portion 2a facing inward. Therefore, the pressure loss when the refrigerant gas passes through the inflow pipe 2 can be minimized while satisfying that the insertion position of the refrigerant pipe connected to the air conditioner body is regulated.

  The effects of the present embodiment will be described. First, a general hermetic compressor 200 and a suction accumulator 21 will be described.

  FIGS. 9 and 10 are diagrams for comparison, FIG. 9 is a longitudinal sectional view showing the entire configuration of a general hermetic compressor 200, and FIG. 10 is a diagram of a suction accumulator 21 of the general hermetic compressor 200. It is a figure which shows a part in a cross section.

  The general hermetic compressor 200 shown in FIG. 9 is different from the hermetic compressor 100 of FIG. 1 only in the suction accumulator 21. The compression element 201 of the hermetic compressor 200, the electric element 202, the hermetic container 210, the glass terminal 220, the discharge pipe 230, and the compression chamber suction port engaging part 24 are respectively connected to the compression element 101 and the electric element 102 of the hermetic compressor 100. These correspond to the sealed container 110, the glass terminal 120, the discharge pipe 130, and the compression chamber suction port engaging portion 4.

A suction accumulator 21 of a general hermetic compressor 200 is different from the suction accumulator 1 of the present embodiment in the following points.
a. The inflow pipe 22 provided in the suction accumulator 21 is inserted into the body part 25, and the upper part from the outlet of the inflow pipe 22 of the body part 25 has an invalid volume from the viewpoint of refrigerant flow (see FIG. 10). ).
b. Since the refrigerant flow path suddenly expands from the inflow pipe 22 to the body part 25 (deployment angle is approximately 180 °), the rapid expansion loss is very large.
c. The outflow portion 28 of the outflow tube 23 is a straight tube that is not reduced in diameter so as to fit the compression chamber suction port engaging portion 4 of the hermetic compressor 200. Therefore, the smooth flow of the refrigerant gas is disturbed at the compression chamber suction port engaging portion 24 of the hermetic compressor 200.
d. The inlet 27 of the outflow pipe 23 does not have a bell mouth shape.

  5 and 6 are diagrams showing the first embodiment, FIG. 5 is a diagram showing the relationship between the expansion angle and the pressure loss in the gently expanding pipe, and FIG. 6 is a diagram showing the relationship between the outlet pipe diameter and the pressure loss. It is.

  As already described, the suction accumulator 1 of the present embodiment is different from the suction accumulator 21 of the general hermetic compressor 200 in that the deployment angle from the inflow pipe 2 provided in the suction accumulator 1 to the body portion 5 is as follows. Is smoothly connected by a diffuser-shaped portion 6 having a small (10 ° to 60) and a convex curve (for example, an arc) inside. Therefore, there is no invalid volume as a flow path that exists in the suction accumulator 21 of the general hermetic compressor 200. Moreover, since the expansion | deployment angle from the inflow pipe 2 to the trunk | drum 5 is small (10 degrees-60), sudden expansion loss becomes very small (refer FIG. 5).

  Further, the inlet 7 of the outflow pipe 3 provided in the suction accumulator 1 has a circular shape or a bell mouth shape having an outer diameter larger than the diameter of the inflow pipe 2. Therefore, the sudden contraction loss when the refrigerant gas flows into the inlet 7 of the outflow pipe 3 and the pipe friction loss when the refrigerant gas passes through the inside of the outflow pipe 3 become very small as shown in FIG.

  As described above, the hermetic compressor 100 including the suction accumulators 1, 1-1 according to the present embodiment can satisfy the function of storing the liquid refrigerant including the gas-liquid separation of the suction refrigerant gas and the separated refrigerating machine oil. The shape of the body part 5, the inflow pipe 2 and the outflow pipe 3 of the suction accumulator 1 is selected within a range to ensure the volume of the body part 5, and has a deployment angle having a diffuser effect and a convex curve (for example, an arc) on the inside. By connecting smoothly with the diffuser shape part 6, the pressure loss of the refrigerant gas when the refrigerant gas passes through the suction accumulator 1 is minimized. Thereby, the refrigerant gas suction efficiency is improved, and the pressure of the refrigerant gas sucked into the compression chamber suction port engaging portion 4 of the hermetic compressor 100 is improved, so that the compression work is close to the ideal pressure state of the refrigeration cycle. Thus, the compressor efficiency is improved, and further, the pressure of the evaporator provided in the air conditioner main body is improved, thereby improving the refrigeration cycle efficiency.

  DESCRIPTION OF SYMBOLS 1 Inhalation accumulator, 1-1 Inhalation accumulator, 2 Inflow pipe, 2a Projection shape part, 3 Outflow pipe, 3-1 Outflow pipe, 4 Compression chamber suction port engaging part, 5 Body part, 6 Diffuser shape part, 7 Inlet 7-1 Inlet, 8 Outlet, 9 Ring member, 10 Oil return hole, 21 Inlet accumulator, 22 Inlet pipe, 23 Outlet pipe, 24 Compression chamber inlet engaging part, 25 Body part, 27 Inlet, 28 Outflow part, 52 four-way valve, 53 outdoor heat exchanger, 54 pressure reducing device, 55 indoor heat exchanger, 56 outdoor fan, 57 indoor fan, 59 top panel, 60 front panel, 61 side panel, 62 separator, 63 Electrical box, 64 Refrigerant piping / refrigerant circuit parts, 68 Bottom plate, 100 Hermetic compressor, 102 Electric element, 110 Hermetic container, 120 Glass terminal, 130 discharge pipe, 200 hermetic compressor, 201 compression element, 202 electric element, 21 suction accumulator, 210 airtight container, 220 glass terminal, 230 discharge pipe, 300 outdoor unit.

Claims (5)

A hermetic compressor having a suction accumulator on the side of the hermetic container,
The suction accumulator comprises the following elements, a hermetic compressor,
(1) An inflow pipe having a constant inner diameter and connected to a refrigerant pipe of a refrigeration cycle;
(2) The overall shape is cylindrical and both ends are squeezed, and is configured to have a predetermined diameter having a volume satisfying the function of storing liquid refrigerant including gas-liquid separation of suction refrigerant gas and separated refrigeration oil, A body portion connected to the inflow pipe, the end portion on the inflow pipe side being configured in a diffuser shape with a predetermined deployment angle, and the diffuser shape portion being smoothly formed with a convex curve inside;
(3) At least one outflow pipe in which the diameter of the inlet is larger than the diameter of the inflow pipe or the inlet has a bell mouth shape.   2. The hermetic compressor according to claim 1, wherein the inflow pipe protrudes inwardly and includes a protrusion-shaped portion for positioning a refrigerant pipe of the refrigeration cycle.   3. The hermetic compressor according to claim 1, wherein the outflow part of the outflow pipe is contracted to fit the compression chamber suction port engaging part of the hermetic compressor.   4. The hermetic compressor according to claim 1, wherein the outflow pipe includes an oil return hole for returning the refrigeration oil to the hermetic compressor at a lower portion in the body part.   The hermetic compressor according to any one of claims 1 to 4, wherein the predetermined deployment angle is 10 ° to 60 °.

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