JP4747478B2 - Hermetic compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hermetic compressor used in a freezer / refrigerator and the like.
[0002]
[Prior art]
Hermetic compressor used in refrigeration refrigeration apparatus or the like, efficiency is strongly desired. For this reason, a method has been conventionally proposed in which the temperature of the gas refrigerant sucked into the compression chamber is made as low as possible to increase the density of the gas refrigerant, thereby increasing the refrigerant circulation amount and increasing the efficiency. For example, in order to lower the temperature of the gas refrigerant, a suction muffler is provided in the suction flow path, and further , a gas refrigerant returning from the external cooling circuit is efficiently sucked into the suction muffler, US Pat. No. 5,496,156 There is a hermetic compressor as shown in FIG.
[0003]
Hereinafter, an example of the conventional hermetic compressor will be described with reference to the drawings.
[0004]
Figure 9 is a front sectional view of the conventional hermetic compressor, FIG. 10 is a side sectional view of a suction muffler.
[0005]
9, 10, 1 in closed container, 2 is the compression element 3 is an electric motor, the compression element 2 and the electric motor 3 is elastically supported on closed container 1 at the coil spring 4 together ing. The compression element 2 includes a cylinder block 6 having a compression chamber 5, a cylinder head 7, a piston 8, a crankshaft 9, a connecting means 10, a bearing 11, and the like. Electric motor 3, the rotor 12 is fixed to the crank shaft 9, is constituted by a stator 13, stator 13 is screwed to the cylinder block 6. Reference numeral 14 denotes lubricating oil which is stored in the lower part of the sealed container 1. Reference numeral 15 denotes a suction muffler, and reference numeral 16 denotes an inlet pipe that opens into the suction muffler 15 and guides the refrigerant to the compression chamber 5. Reference numeral 17 denotes a conical inlet port opened in the sealed container 1 for guiding the gas refrigerant into the suction muffler 15. Reference numeral 18 denotes a suction pipe fixed to the hermetic container 1, and is arranged to face the conical inlet port 17. Although not shown, an oil drain hole that communicates the inside and outside of the suction muffler is provided in the lower portion of the suction muffler 15.
[0006]
The operation of the hermetic compressor configured as described above will be described below.
[0007]
The electric motor 3 drives the crankshaft 9 of the compression element 2, the coupling means 10, the piston 8, etc., and the gas refrigerant flowing from the external cooling circuit (not shown) is once stored in the sealed container 1 via the suction pipe 18. Then, the air is sucked into the suction muffler 15 through the conical inlet port 17 and further intermittently sucked into the compression chamber 5 through the inlet pipe 16.
[0008]
At that time, the gas refrigerant is sucked into the suction muffler 15 with a relatively low temperature compared to the case where the suction pipe 18 and the conical inlet port 17 are close to each other and are not close to each other. . As a result, the suction mass (refrigerant circulation amount) per unit time of the gas refrigerant is increased, the refrigeration capacity is improved, and the efficiency of the hermetic compressor is improved.
[0009]
Further, when stopping, the lubricating oil 14 in the suction muffler 15 is discharged from the oil discharge hole to the outside suction muffler 15, it is prevented from compressed intake a large amount of lubricating oil 14 to the compression chamber 5 at start .
[0010]
[Problems to be solved by the invention]
However in the conventional configuration, the gas refrigerant, when it is opened to hermetic container 1 from the suction pipe 18, the temperature is increased by mixing with small gas refrigerant density at a high temperature in hermetic container 1. For this reason, the gas refrigerant sucked into the suction muffler 15 from the conical inlet port 17 becomes considerably hotter than the gas refrigerant immediately after the outlet of the suction pipe 18, and the refrigerant circulation amount becomes small and the efficiency is lowered.
[0011]
Further, since the suction muffler 15 is in the high-temperature gas refrigerant in the sealed container 1 and is close to the high-temperature electric motor 3, the temperature of the suction muffler 15 is increased by heat transfer and heat radiation, and the gas refrigerant is , temperature and heat while passing through the suction muffler 15 is increased, by the amount of circulating refrigerant is reduced, the refrigeration capacity and efficiency disadvantageously decreases.
[0012]
On the other hand, in order to lower the temperature of the gas refrigerant sucked into the suction muffler, the so-called direct suction method is adopted, in which the suction pipe and the inlet port of the suction muffler are connected by means of a flow path such as a close coil spring. In this case, since the gas refrigerant flows directly into the suction muffler by the communication means of the flow path, the temperature of the gas refrigerant decreases, but the pressure pulsation generated in the suction muffler and the vibration of the suction muffler The signal is transmitted to the suction pipe without being attenuated so much through the communication means. For this reason, there has been a drawback that vibration due to the suction pipe and the pipe connected to the suction pipe and noise caused by the vibration are increased.
[0013]
The present invention is intended to solve the conventional problems, by inhalation into the left suction muffler of low temperature gas refrigerant, to reduce further the temperature rise of the refrigerant in the suction muffler, with improved efficiency, pressure It is an object of the present invention to provide a hermetic compressor with low vibration and noise, with a simple structure at low cost, which makes it difficult to transmit pulsation and vibration from the suction muffler to the suction pipe.
[0014]
[Means for Solving the Problems]
According to a first aspect of the present invention, a lubricating oil is stored in a sealed container, a compression element driven by an electric motor is accommodated, a crankshaft composed of a main shaft and an eccentric shaft, and the crankshaft of the crankshaft A cylinder block that supports the main shaft and has a compression chamber, a piston that reciprocates in the compression chamber, a connecting means that connects the eccentric shaft of the crankshaft and the piston, and one end of the compression chamber via a valve plate A suction muffler having a suction port that communicates with the other end and that opens into the sealed container, and the suction port opens to the sealed container side of the suction muffler. the wall part of the sealed container side comprising the muffler enclosure extending to the closed container side is provided, a suction pipe communicating said sealed container and out of the muffler enclosure A is opened at a position facing, further, the center of the suction port, and has a structure in which the positions except the vertical and horizontal 25% of the closed container side surface of the suction muffler.
[0015]
With this configuration, most of the low-temperature gas refrigerant flowing from the suction pipe into the sealed container is directly sucked into the suction muffler from the opposite suction port, and the others are sealed from the side surface of the suction muffler with the muffler enclosure. After staying between the containers, it is sucked from the suction port. In this case, gas refrigerant is once retained in the muffler enclosure, because it does not touch the hot compression element and an electric motor, most temperature rise without being sucked into the suction muffler while cold. Further, since the low-temperature gas refrigerant stays in the muffler enclosure, the temperature of the side surface of the suction muffler on the side of the closed container is lowered, and the temperature rise of the gas refrigerant in the suction muffler is reduced. The refrigeration capacity and efficiency are improved by these two actions, that is, the temperature of the gas refrigerant sucked into the suction muffler from the suction port is lowered and the temperature rise of the refrigerant in the suction muffler is reduced.
[0016]
Further, since the suction muffler is not connected to the suction pipe , the vibration of the suction muffler is not transmitted to the suction pipe or the sealed container. Furthermore, the space in the muffler enclosure, because in communication with the large sealed container volume, pressure pulsation generated in the suction muffler, is attenuated as it is open to the muffler enclosure from the suction port, the suction tube Hardly communicates. Therefore, vibrations and noise caused by vibrations can be reduced.
[0017]
As described above, the present invention has the effects of improving the refrigerating capacity and efficiency and reducing the vibration and noise caused by the vibration.
[0018]
Further, the invention described in claim 1 is configured such that the center of the suction port is provided at a position excluding 25% on the top, bottom, left and right of the closed container side surface of the suction muffler. With this configuration, the suction port is located near the center of the muffler enclosure as compared with the case where the suction port is in the range of 25% up, down, left and right of the side of the muffler, that is, near the muffler enclosure. It is difficult to be affected by the high-temperature gas refrigerant, the temperature of the gas refrigerant sucked from the suction port is further lowered, and the refrigeration capacity and efficiency are further improved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, reference examples and embodiments of a hermetic compressor according to the present invention will be described with reference to the drawings.
[0020]
(Reference Example 1)
FIG. 1 is a front sectional view of a hermetic compressor according to Reference Example 1 of the present invention. FIG. 2 is a side cross-sectional view of the hermetic compressor of the first reference example. FIG. 3 is a plan cross-sectional view of the hermetic compressor of the first reference example.
[0021]
1, 2, 3, 19 in the closed vessel, 20 in the compression element, 21 is an electric motor, the compression element 20 and the electric motor 21, the sealed container 19 at the coil spring 22 together Elastically supported. The compression element 20 includes a cylinder block 24 having a compression chamber 23, a cylinder head 25, a piston 26, a crankshaft 27, a coupling means 28, a bearing 29, and the like. The crankshaft 27 includes a main shaft 27a and an eccentric shaft 27b. The electric motor 21, the rotor 30 is fixed to the crankshaft 27, is constituted by a stator 31, the stator 31 is screwed to the cylinder block 24. Reference numeral 32 denotes lubricating oil which is stored in the lower part of the sealed container 19. Reference numeral 33 denotes a suction muffler, which has one end communicating with the compression chamber 23 via the valve plate 34 and the other end provided with a suction port 35 that opens into the sealed container 19. The suction port 35 opens to the closed container 19 side of the suction muffler 33. Reference numeral 36 denotes a muffler enclosure, which is formed on the outer periphery of the side surface of the sealed container 19 including the suction port 35 and extends to the sealed container 19 side. A suction pipe 37 communicates the inside and outside of the sealed container 19 and opens at a position facing the inside of the muffler enclosure 36.
[0022]
The operation of the hermetic compressor configured as described above will be described below.
[0023]
The electric motor 21 drives the crankshaft 27, the coupling means 28, the piston 26 and the like of the compression element 20, and the gas refrigerant flowing from the external cooling circuit (not shown) enters the sealed container 19 through the suction pipe 37. Inflow. Low temperature gas refrigerant flowing into the closed vessel 19 from the suction pipe 37 is largely is sucked directly from the suction port 35 which faces into the suction muffler 33, others, the muffler enclosure 36, sealed container of the suction muffler 33 After temporarily retaining between the side surface on the 19 side and the sealed container 19, the air is sucked from the suction port 35. At this time, the gas refrigerant once retained in the muffler enclosure 36 does not touch the high-temperature compression element 20 or the electric motor 21, so that the temperature hardly rises and is sucked into the suction muffler 33 at a low temperature. Further, since the low-temperature gas refrigerant stays in the muffler enclosure 36, the temperature of the side surface of the suction muffler 33 on the closed container 19 side is lowered, and the temperature rise of the gas refrigerant in the suction muffler 33 is reduced. Due to these two actions, that is, the temperature of the gas refrigerant sucked into the suction muffler 33 from the suction port 35 becomes lower and the temperature rise of the refrigerant in the suction muffler 33 becomes smaller, the refrigerating capacity and efficiency are improved. improves.
[0024]
Further, suction muffler 33, since not connected with the suction pipe 37, the vibration of the suction muffler 33 is not transmitted to the suction pipe 37 and the closed container 19. Furthermore, the attenuation when the space in the muffler enclosure 36, for communicating with the large sealed container 19 of volume, pressure pulsation generated in the suction muffler 33, which is open to the muffler enclosure 36 through the inlet 35 And hardly transmitted into the suction pipe 37. Therefore, vibrations and noise caused by vibrations can be reduced.
[0025]
( Reference Example 2 )
FIG. 4 is a front sectional view of a hermetic compressor according to Reference Example 2 of the present invention. FIG. 5 is a side sectional view of the hermetic compressor of Reference Example 2 .
[0026]
4 and 5, reference numeral 38 denotes a suction muffler, and one end communicates with the compression chamber 23 via the valve plate 34, and the other end includes a suction port 35 that opens into the sealed container 19. The suction port 35 opens to the closed container 19 side of the suction muffler 38. Reference numeral 39 denotes a muffler enclosure, which is formed on the outer periphery of the side surface on the side of the sealed container 19 including the suction port 35 and extends to the side of the sealed container 19 and is formed of an elastic body. The elastic muffler enclosure 39 may be made of any material that can be used in an atmosphere of refrigerant or lubricating oil 32 and has elasticity. For example, there are rubber materials such as nitrile butadiene rubber (NBR) and epichlorohydrin rubber. In addition, a thin sheet may be formed. In this case, a fiber sheet coated with rubber, a fiber and rubber formed by compression heating, a fiber sheet alone, or Teflon may be used. Moreover, anti-sealed container 19 side surface of the suction muffler 38 is formed by a double wall. Reference numeral 40 denotes an oil drain hole provided in the lower part of the side surface of the suction muffler 38 on the closed container 19 side.
[0027]
Reference Example 2 is a hermetic compressor according to Reference Example 1, in which the muffler enclosure 39 is formed of an elastic body and the length of the muffler enclosure 39 extending is increased so that the suction muffler 38 on the side of the anti-sealed container 19 is The side surface is formed of a double wall, and an oil drain hole 40 is provided in the lower portion of the side surface of the suction muffler 38 on the closed container 19 side.
[0028]
The operation of the hermetic compressor configured as described above will be described below.
[0029]
During or during starting and stopping, or at the time of transportation, the compression element 20, because it is elastically supported by the coil spring 22, largely fluctuates in the sealed container 19. At that time, even if the muffler enclosure 39 comes into contact with the sealed container 19, the muffler enclosure 39 is formed of an elastic body, so that the muffler enclosure 39 is not damaged and no contact sound is generated. Therefore, assuming that no contact, as compared with the case of forming a muffler enclosure, can increase the height extending in the muffler enclosure 39. With this configuration, the gas refrigerant temporarily accumulated in the muffler enclosure 39, further temperature is lowered not easily mixed with the hot gas in the sealed container 19, gas is sucked into the suction muffler 38 from the inlet port 35 As the temperature of the refrigerant is lowered and the temperature of the suction muffler 38 is further lowered, the temperature rise of the refrigerant in the suction muffler 38 is reduced, and the refrigerating capacity and efficiency are further improved.
[0030]
Moreover, anti-sealed container 19 side surface of the suction muffler 38, since it is formed by a double wall, heat from the anti-sealing vessel 19 of the high temperature on the side gas refrigerant and a high temperature of the electric motor 21 of suction muffler 38 However, it is possible to prevent the suction muffler 38 from being transmitted to the gas refrigerant in the suction muffler 38 from the side surface on the anti-sealed container 19 side. Further, since the side surface of the suction muffler 38 on the side of the sealed container 19 is cooled by the muffler enclosure 39, it is not necessary to insulate by forming a double wall, and only the side surface on the side of the anti-sealed container 19 is doubled. By using this wall, the heat received from both sides is reduced, and the refrigeration capacity and efficiency are improved by a synergistic effect. Therefore, the refrigerating capacity and efficiency are improved with a simple structure at a low cost, compared to the case where all the sides of the suction muffler 38 are double walls.
[0031]
Further, since the oil drain hole 40 is provided in the lower part of the side surface of the suction muffler 38 on the closed container 19 side , the muffler enclosure 39 is provided between the side surface of the suction muffler 38 on the closed container 19 side and the closed container 19 during operation. The low-temperature gas refrigerant staying inside is sucked into the suction muffler 38 from the oil drain hole 40. Therefore, the refrigerating capacity and efficiency are improved without increasing the temperature of the gas refrigerant in the suction muffler 38.
[0032]
(Embodiment 1 )
FIG. 6 is a side sectional view of the hermetic compressor according to the first embodiment of the present invention. FIG. 7 is a plan sectional view of the hermetic compressor according to the first embodiment.
[0033]
6 and 7, reference numeral 41 denotes a suction muffler, which has one end communicating with the compression chamber 23 via the valve plate 34 and the other end provided with a suction port 42 that opens into the sealed container 19. The center of the suction port 42 is provided at a position excluding 25% on the top, bottom, left and right of the surface of the suction muffler 41 on the sealed container 19 side. Reference numeral 43 denotes a muffler enclosure, which is formed on the outer periphery of the side surface on the closed container 19 side including the suction port 42 and extends to the closed container 19 side. A suction pipe 44 communicates the inside and outside of the sealed container 19 and opens at a position facing the suction port 42 in the muffler enclosure 43.
[0034]
In the closed compressor according to the first embodiment, the first embodiment is such that the position of the suction port 42 is positioned near the center of the surface of the suction muffler 41 on the side of the sealed container 19, and the suction pipe 44 is placed in the muffler enclosure 43. The configuration is such that it faces the suction port 42.
[0035]
The operation of the hermetic compressor configured as described above will be described below.
[0036]
The suction port 42 is positioned near the center of the muffler enclosure 43 as compared with the case where the suction port 42 is in the range of 25% of the side of the suction muffler 41 in the vertical and horizontal directions, that is, close to the muffler enclosure 43. The temperature of the gas refrigerant sucked from the inlet 42 is further lowered, and the refrigerating capacity and efficiency are further improved.
[0037]
(Reference Example 3 )
FIG. 8 is a side sectional view of a hermetic compressor according to Reference Example 3 of the present invention.
[0038]
In FIG. 8, reference numeral 45 denotes a suction muffler, which has one end communicating with the compression chamber 23 via the valve plate 34 and the other end provided with a suction port 46 that opens into the sealed container 19. An intake gas receiving plate 47 is provided around the intake port 46 and connected to the main body of the intake muffler 45. The suction pipe 37 communicating with the inside and outside of the sealed container 19 is opened at a position facing the suction port 46 as in the first reference example.
[0039]
The operation of the hermetic compressor configured as described above will be described below.
[0040]
By providing the suction gas receiving plate 47 even when the suction port 46 is located near the end of the suction muffler 45 main body as shown in FIG. , part of the gas refrigerant flowing from the suction pipe 37 is temporarily retained against the front suction gas receiving plate 47, further suction gas receiving plate 47, because it is connected to the body of the suction muffler 45, a suction muffler 45 and the intake gas the front surface of the receiving plate 47, so that the low gas refrigerant temperature stays. The staying low temperature gas refrigerant, in addition to the temperature of the gas refrigerant sucked be lower in the suction muffler 45, the temperature rise of the refrigerant is small in the suction muffler 45 when the temperature is low in the suction muffler 45 The refrigeration capacity and efficiency are improved with a simple structure. In addition, since the suction gas receiving plate 47 exhibits a sufficient effect even if it is a thin plate, it is easy to apply even when the gap between the sealed container 19 and the suction muffler 45 is small, and only needs to be added to the conventional suction muffler. Easy to change.
[0041]
【The invention's effect】
As described above, the invention according to claim 1 includes, in the structure of the compression element, the suction muffler having one end communicating with the compression chamber via the valve plate and the other end having the suction port that opens into the sealed container. The suction port opens to the sealed container side of the suction muffler, and a muffler enclosure extending to the sealed container side is provided on the outer periphery of the sealed container side including the suction port, so that the suction port communicates with the inside and outside of the sealed container. the tube since the has a configuration in which is opened at a position facing the inside of the muffler enclosure, and the temperature of the gas refrigerant becomes lower to be sucked into the suction muffler from the inlet port, the refrigerant in the suction muffler By reducing the temperature rise, the refrigeration capacity and efficiency are improved, and vibrations and noise caused by vibrations can be reduced.
[0042]
In the invention according to claim 1, since the center of the suction port is provided at a position excluding the top, bottom, left and right 25% of the airtight container side surface of the suction muffler, the gas refrigerant having a high temperature outside the muffler enclosure is provided. The temperature of the gas refrigerant sucked from the suction port is further lowered, and the refrigerating capacity and efficiency are further improved.
[Brief description of the drawings]
FIG. 1 is a front sectional view of Reference Example 1 of a hermetic compressor according to the present invention. FIG. 2 is a side sectional view of a hermetic compressor of Reference Example 1. FIG. Plan sectional view [FIG. 4] Front sectional view of Reference Example 2 of a hermetic compressor according to the present invention [FIG. 5] Side sectional view of a hermetic compressor of Reference Example 2 [FIG. 6] Hermetic compressor according to the present invention side cross-sectional view of the first embodiment of FIG. 7 is a front sectional view of reference example 3 of the hermetic compressor according to a plan sectional view and FIG. 8 invention hermetic compressor of embodiment 1 of this embodiment 9 Front sectional view of a conventional hermetic compressor [Fig. 10] Side sectional view of a suction muffler of a conventional hermetic compressor [Explanation of symbols]
DESCRIPTION OF SYMBOLS 19 Sealed container 20 Compression element 21 Electric motor 23 Compression chamber 24 Cylinder block 26 Piston 27 Crankshaft 27a Main shaft 27b Eccentric shaft 28 Connecting means 32 Lubricating oil 33 Suction muffler 34 Valve plate 35 Suction port 36 Muffler enclosure 37 Suction pipe 38 Suction muffler 39 Muffler enclosure 40 Oil drain hole 41 Suction muffler 42 Suction port 43 Muffler enclosure 44 Suction pipe 45 Suction muffler 46 Suction port 47 Suction gas receiving plate

Claims (1)

A cylinder block that stores lubricating oil in an airtight container and accommodates a compression element that is driven by an electric motor, includes a main shaft and an eccentric shaft, and a cylinder block that supports the main shaft of the crank shaft and has a compression chamber. A piston that reciprocates in the compression chamber, a connecting means that connects the eccentric shaft of the crankshaft and the piston, one end communicating with the compression chamber via a valve plate, and the other end in the sealed container. A suction muffler having a suction opening that opens, and the suction opening opens to the closed container side of the suction muffler, and the closed container is disposed on the outer periphery of the side of the closed container including the suction opening. the muffler enclosure extending to the side provided a suction pipe communicating said sealed container and out, is opened at a position facing the inside of the muffler enclosure, further , The center of the inlet, the hermetic compressor provided in a position except for the vertical and horizontal 25% of the closed container side surface of the suction muffler.

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