JP2013231429A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor having higher efficiency than a conventional one.SOLUTION: A hermetic compressor includes an intake pipe arranged in a sealed container for sucking a refrigerant gas from the outside into the sealed container, and a suction muffler 131 having an inner space. An outlet opening 179 of the inlet pipe 149 and an inlet opening 191 of an outlet pipe 153 are disposed to face each other, and an opening area S1 of the inlet opening of the outlet pipe 153 is smaller than an opening area S2 of the outlet opening of the inlet pipe 149.

Description

  The present invention relates to a hermetic compressor used in a freezer / refrigerator and the like.

  As a conventional hermetic compressor, a suction muffler having an inlet pipe and an outlet pipe is provided in a sealed container, and the inlet opening area of the outlet pipe of the suction muffler is made larger than the outlet opening area of the inlet pipe. The refrigerant gas released from the outlet opening is easily sucked from the inlet opening of the outlet pipe, and the heat reception until the refrigerant gas released in the suction muffler reaches the outlet pipe is reduced and the efficiency is thereby improved. Those are known (for example, see Patent Document 1). Further, Patent Document 2 discloses a hermetic compressor having the same configuration by the present applicant.

  Hereinafter, a conventional hermetic compressor disclosed in Patent Document 1 will be described with reference to the drawings.

  FIG. 5 is a cross-sectional view of main parts of a conventional hermetic compressor, and FIG. 6 is a cross-sectional view of main parts of a suction muffler used in the conventional hermetic compressor.

  5 and 6, the hermetic container 1 includes a discharge pipe (not shown) connected to a cooling system (not shown) and a suction pipe 3, and stores and fixes oil (not shown) at the bottom. An electric element (not shown) including a child (not shown) and a rotor (not shown) and a compression element 5 driven by the electric element (not shown) are accommodated, and the inside is filled with the refrigerant gas 7.

  Next, the main configuration of the compression element 5 will be described.

  The cylinder 9 includes a substantially cylindrical compression chamber 11 and a bearing portion 13. The valve plate 15 includes a discharge valve device 17 on the side opposite to the cylinder 9 and closes the compression chamber 11. The head 19 covers the valve plate 15 and forms a discharge chamber 21. The suction muffler 23 is configured such that one end opens into the sealed container 1 and the other end communicates with the compression chamber 11 via a suction valve 25. The crankshaft 27 has a main shaft portion 29 and an eccentric portion 31, is supported by the bearing portion 13 of the cylinder 9 and is press-fitted and fixed to a rotor (not shown). The piston 33 is inserted into the compression chamber 11 so as to be reciprocally slidable, and is connected to the eccentric portion 31 by a connecting rod 35.

  Next, the suction muffler 23 provided in the compression element 5 will be described.

  The suction muffler 23 includes a first inlet pipe 43, a second inlet pipe 53, and an outlet pipe 59. One end of the first inlet pipe 43 has an intake gas inlet 37 that opens into the sealed container 1, and the other end has an outlet opening 41 that opens into a first muffler space 39 in the suction muffler 23. One end of the second inlet pipe 53 has an inlet opening 45 that opens into the first muffler space 39, and the other end has an outlet opening 49 that opens into the second muffler space 47 and a resonator 51. . One end of the outlet pipe 59 has an inlet opening 55 that opens substantially in the center of the second muffler space 47, and the other end has an outlet opening 57 that communicates with the compression chamber 11 via the suction valve 25.

  Further, the outlet opening 49 of the second inlet pipe 53 and the inlet opening 55 of the outlet pipe 59 are arranged to face each other, and the opening area of the inlet opening 55 of the outlet pipe 59 is the second inlet pipe 53. It is larger than the opening area of the outlet opening 49.

  The operation of the hermetic compressor configured as described above will be described below.

  The refrigerant gas 7 returning from the cooling system (not shown) to the hermetic compressor is sucked from the suction gas inlet portion 37 of the suction muffler 23, passes through the first inlet pipe 43, and the first gas in the suction muffler 23. Refrigerant gas is released into the muffler space 39, sucked from the inlet opening 45 of the second inlet pipe 53 having the resonator 51, opened into the second muffler space 47, and passed through the outlet pipe 59 to the cylinder 9. 7 is supplied. The outlet opening 49 of the second inlet pipe 53 and the inlet opening 55 of the outlet pipe 59 face each other, and the opening area of the inlet opening 55 of the outlet pipe 59 is equal to that of the outlet opening 49 of the second inlet pipe 53. Larger than the opening area. As a result, the refrigerant gas 7 discharged from the second inlet pipe 53 can be easily sucked from the outlet pipe 59, so that the refrigerant gas 7 opened to the second muffler space 47 in the suction muffler 23 reaches the outlet pipe 59. It has been said that the heat reception up to can be reduced and the efficiency can be improved.

US Patent Application Publication No. US2009 / 0038329A1 Japanese Patent No. 4682447

  However, the conventional technology has a problem that there is room for improving the efficiency of the hermetic compressor as described later.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a highly efficient hermetic compressor as compared with the conventional example.

  In order to solve the conventional problems, the outlet opening of the inlet pipe and the inlet opening of the outlet pipe are opposed to each other, and the opening area of the inlet opening of the outlet pipe is made smaller than the opening area of the outlet opening of the inlet pipe.

  As a result, a relatively large amount of cold refrigerant gas discharged from the outlet opening of the inlet pipe is sucked from the inlet opening of the outlet pipe as compared with the warm refrigerant in the inner space of the suction muffler, so that the heat receiving loss is reduced. Compared to the above, a highly efficient hermetic compressor can be provided.

  That is, it is difficult for the warm refrigerant in the inner space of the suction muffler to be sucked from the inlet opening of the outlet pipe, and conversely, the cold refrigerant gas discharged from the outlet opening of the inlet pipe is easily sucked, so that the heat receiving loss is reduced. Reduced.

  The hermetic compressor of the present invention can provide a highly efficient hermetic compressor as compared with the prior art.

It is sectional drawing of the hermetic compressor in Embodiment 1 of this invention. It is principal part sectional drawing of the suction muffler used for the hermetic compressor in Embodiment 1 of this invention. It is the sectional view on the AA line of FIG. It is a table | surface which shows the result of the performance test of the hermetic compressor in Embodiment 1 of this invention. It is principal part sectional drawing of the conventional hermetic compressor. It is principal part sectional drawing of the suction muffler used for the conventional hermetic compressor.

(Knowledge that became the basis of the present invention)
In the hermetic compressor of Patent Document 2 by the present applicant, one end of the outlet pipe of the suction muffler provided in the hermetic container and one end of the inlet pipe face each other, and the inlet opening area of the outlet pipe is the outlet opening area of the inlet pipe. Greater than. This makes it easier for the refrigerant gas released from the outlet opening of the inlet pipe to be sucked from the inlet opening of the outlet pipe, reducing heat reception until the refrigerant gas released into the suction muffler reaches the outlet pipe, and improving efficiency. improves.

  In order to further improve the energy efficiency of the above-described hermetic compressor, the present inventors have conducted detailed studies including experiments on the arrangement structure of one end of the outlet pipe and one end of the inlet pipe of the suction muffler. As a result, the effect of improving the efficiency in the hermetic compressor of Patent Document 2 is mainly brought about by making one end of the outlet pipe of the suction muffler and one end of the inlet pipe face each other, and It has been found that if the opening area of the inlet section of the outlet pipe is larger than the opening area of the outlet section of the inlet pipe, the cold refrigerant gas and the warm refrigerant gas are simultaneously sucked in, resulting in an increase in heat receiving loss and a decrease in the refrigeration capacity .

  The present invention has been made on the basis of such knowledge, and aims to improve the efficiency of a hermetic compressor by reducing heat reception loss by making it difficult to suck warm refrigerant gas in the internal space of the suction muffler. It is said.

  In the first invention, the hermetic compressor includes a hermetic container, an electric element disposed in the hermetic container, a compression element driven by the electric element, and an external element disposed in the hermetic container. A suction pipe for sucking refrigerant gas into the sealed container, and a suction muffler having an internal space. The suction muffler has one end opened in the sealed container and the other end of the suction muffler. An inlet pipe having an outlet opening that opens into the internal space; an outlet pipe having one end opening into the internal space of the suction muffler and the other end communicating with the compression chamber of the compression element; The outlet opening of the inlet pipe and the inlet opening of the outlet pipe are arranged to face each other, and the inlet opening area of the outlet pipe is smaller than the outlet opening area of the inlet pipe.

  As a result, a relatively large amount of cold refrigerant gas discharged from the outlet opening of the inlet pipe is sucked from the inlet opening of the outlet pipe as compared with the warm refrigerant in the internal space of the suction muffler. That is, it is difficult for warm refrigerant gas in the suction muffler space to be sucked from the inlet opening of the outlet pipe, and conversely, cold refrigerant gas discharged from the outlet opening of the inlet pipe is easily sucked, so that the heat receiving loss is reduced. Thus, a highly efficient hermetic compressor can be provided.

  According to a second invention, in the first invention, the outlet opening of the inlet pipe and the inlet opening of the outlet pipe face each other in a substantially horizontal direction, and the center of the inlet opening of the outlet pipe is the center of the inlet pipe. It is located between the center of the outlet opening and the lower inner wall surface of the outlet opening of the inlet pipe.

  As a result, since the cold refrigerant discharged from the outlet opening of the inlet pipe flows downward due to gravity, the inlet opening of the outlet pipe is located between the center of the outlet opening of the inlet pipe and the lower inner wall surface of the outlet opening of the inlet pipe. By being provided in between, the inlet opening can easily receive the refrigerant flowing downward. For this reason, since heat receiving is further reduced, a hermetic compressor with higher efficiency can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a hermetic compressor according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of a main part of a suction muffler used in the hermetic compressor according to Embodiment 1 of the present invention. 3 is a cross-sectional view taken along line AA in FIG.

  1, 2, and 3, the sealed container 101 includes a discharge pipe (not shown) connected to a cooling system (not shown) and a suction pipe 103, and stores oil 105 at the bottom and a stator. The electric element 111 composed of 107 and the rotor 109 and the compression element 113 driven by the electric element 111 are accommodated, and the internal space is filled with the refrigerant gas 115.

  Next, the main configuration of the compression element 113 will be described. A known compressor can be used as the compression element 113. Below, the compression element 113 comprised with a reciprocating compressor is illustrated.

  The cylinder 117 includes a substantially cylindrical compression chamber 119 and a bearing portion 121. The valve plate 123 includes a discharge valve device 125 on the side opposite to the cylinder 117 and closes the compression chamber 119. The head 127 covers the valve plate 123 and forms a discharge chamber 129. One end of the suction muffler 131 opens into the internal space of the sealed container 101, and the other end communicates with the inside of the compression chamber 119 via the suction valve 133. The crankshaft 135 has a main shaft portion 137 and an eccentric portion 139, and is supported by the bearing portion 121 of the cylinder 117 and press-fitted and fixed to the rotor 109. The piston 141 is inserted into the compression chamber 119 so as to be slidable back and forth, and is connected to the eccentric portion 139 by a connecting rod 143.

  Next, the suction muffler 131 provided in the compression element 113 will be described.

  The suction muffler 131 has a muffler space (internal space) 157 and is a silencer as means for attenuating noise generated in the compression chamber 119 and the suction valve 133. From the viewpoint of improving the performance of the hermetic compressor, it is desirable to be made of a material having low thermal conductivity, for example, a synthetic resin material. The synthetic resin material may be, for example, a material such as PBT (Polybutyleneterephtalate) or PPS (Polyphenylenesulfide) in consideration of a use environment such as a refrigerant gas atmosphere and a high temperature.

  The suction muffler 131 includes, for example, a muffler body 145, a muffler cover 147, an L-shaped refracting portion 151 of the inlet pipe 149, and an L-shaped refracting section 155 of the outlet pipe 153. Usually, after each component is assembled, the muffler body 145 and the muffler cover 147 are welded to each other by an ultrasonic welding method or the like, and the suction muffler 131 is formed. At this time, the muffler cover 147 has a flat and simple shape, and has a function as an upper wall surface forming the muffler space 157.

  In addition, an L-shaped refracting portion 151 of the inlet pipe 149 and an L-shaped refracting section 155 of the outlet pipe 153 are supported by protrusions (not shown) formed integrally with the muffler cover 147, respectively. Thereby, the welding coupling | bonding of the muffler main body 145 and the L-shaped refractive part 151,155 can be abbreviate | omitted. Note that the shapes of the inlet pipe 149 and the outlet pipe 153 are not limited to this, and may be any shape as long as one ends of the inlet pipe 149 and the outlet pipe 153 face each other.

  Here, the protrusions may be integrally formed on the L-shaped refracting portions 151 and 155, respectively. In this configuration as well, the welding connection between the muffler main body 145 and the L-shaped refracting portions 151 and 155 can be omitted.

  The introduction part 163 is formed integrally with the muffler main body 145, and one end thereof opens into the sealed container 101 and the other end opens into the inlet pipe 149. The wall surface forming the introduction portion 163 and the wall surface 165 forming the muffler main body 145 coincide with each other only on the back surface 167, and other remaining wall surfaces are different. The sealed container 101 side opening 169 of the introduction part 163 has a substantially rectangular opening shape and has a space inside a substantially polyhedron, and has a direction facing the suction pipe 103.

  The inlet tube 149 includes, for example, a vertical portion 171 and an L-shaped refracting portion 151, and the inlet tube 149 is formed in an approximately L shape by the L-shaped refracting portion 151, and the vertical portion 171 and the L-shaped refracting portion. Each of the connection portions 173 and 175 of 151 includes a combination of a plurality of arcs or straight lines.

  One end of the inlet pipe 149 opens into the sealed container 101, and the other end thereof is a circular or multi-sided shaped outlet opening 179 provided in a substantially horizontal direction (center (F) 177 direction) of the L-shaped refracting portion 151. To the muffler space 157 of the suction muffler 131. In addition, a side branch type resonator 181 that extends downward from the L-shaped refracting portion 151 is formed on one of the substantially axial lines of the L-shaped refracting portion 151 of the inlet pipe 149. The side branch type resonator 181 may be omitted.

  Next, the outlet pipe 153 includes, for example, a vertical portion 183 and an L-shaped refracting portion 155, and the outlet pipe 153 is formed in a substantially L shape by the L-shaped refracting portion 155. Each shape of the connection parts 185 and 187 of the mold refraction part 155 is composed of a combination of a plurality of arcs or straight lines.

  One end of the outlet pipe 153 communicates with the compression chamber 119 via the suction valve 133, and the other end is a circle or many provided in a substantially horizontal direction (center (G) 189 direction) of the L-shaped refracting portion 155. The muffler space 157 is opened by a side-shaped inlet opening 191. The inlet opening 191 and the outlet opening 179 of the L-shaped refracting part 151 are opposed to each other in a substantially horizontal direction.

  At this time, the opening area S1 of the inlet opening 191 is smaller than the opening area S2 of the outlet opening 179, and the center (G) 189 of the L-shaped refracting part 155 is the center of the L-shaped refracting part 151 (F ) And the lower inner wall surface 193 of the outlet opening 179.

  The vertical portion 171 of the inlet pipe 149 and the vertical portion 183 of the outlet pipe 153 are integrally formed with the side wall surface 165 of the sealed container 101 of the muffler main body 145, respectively.

  The operation and action of the hermetic compressor configured as described above will be described below.

  Referring to FIGS. 1 and 2, the cold refrigerant gas 115 returned from the suction pipe 103 enters the inlet pipe 149 through the introduction part 163, passes through the vertical part 171, and exits from the outlet opening part 179 of the L-shaped refracting part 151. It flows into the muffler space 157 and is led to the inlet opening 191 of the L-shaped refracting part 155 of the outlet pipe 153 disposed so as to face the outlet opening 179 and passes through the vertical part 183 of the outlet pipe 153. Then, it is fed into the compression chamber 119.

  At this time, since the opening area S1 of the inlet opening 191 of the L-shaped refracting part 155 is smaller than the opening area S2 of the outlet opening 179, the warm refrigerant gas in the suction muffler space 157 is introduced from the inlet opening 191 of the outlet pipe 153. 115 is difficult to be sucked, and conversely, the cold refrigerant gas 115 discharged from the outlet opening 179 of the inlet pipe 149 is easily sucked, so that a heat receiving loss is reduced and a highly efficient hermetic compressor is provided. Can do.

  Further, the center (G) 189 of the inlet opening 191 of the outlet pipe 153 is located between the center (F) 177 of the outlet opening 179 of the inlet pipe 149 and the lower inner wall surface 193 of the outlet opening 179 of the inlet pipe 149. It is arranged to do. As a result, the inlet opening 191 is positioned below the outlet opening 179 in the substantially vertical direction, so that when the cold refrigerant gas 115 is discharged from the outlet opening 179, it easily flows downward due to gravity. Therefore, it becomes easier to receive the cold refrigerant gas 115 at the inlet opening 191. For this reason, since a heat receiving loss is further reduced, a hermetic compressor with higher efficiency can be provided.

(Example)
In order to verify the effect of the hermetic compressor of the present embodiment, the present inventors manufactured a hermetic compressor according to the present embodiment, and the hermetic compressor was subjected to certain conditions. A performance test was performed. The test conditions were AHAM (Association of Home Appliance Manufacturers) conditions. The condensation temperature in the refrigeration cycle was 40.6 ° C., the evaporation temperature was −23.3 ° C., the intake gas temperature was 32.2 ° C., the temperature before the expansion valve was 32.2 ° C., and the surface temperature of the sealed container was 65 ° C. The compressor was operated by a 115V / 60Hz power supply in an environment with an external temperature of 32.2 ° C.

  In this test, the test result obtained by the hermetic compressor of the present embodiment was compared with the test result obtained by the comparative example. A hermetic compressor having the same configuration as that of the hermetic compressor of Patent Document 2 was used as a comparative example.

In the present embodiment, the inlet opening area S1 of the outlet pipe of the suction muffler is smaller than the outlet opening area S2 of the inlet pipe. Here, the opening shape of the inlet pipe is a circle having a diameter φ of 10 mm, and the opening shape of the outlet pipe is a circle having a diameter φ of 9 mm. The sectional area S2 of the opening of the inlet pipe is about 79 mm ² and the sectional area S1 of the opening of the outlet pipe is about 64 mm ² .

In the comparative example, the inlet opening area S1 of the outlet pipe of the suction muffler is larger than the outlet opening area S2 of the inlet pipe. Here, the opening shape of the inlet pipe is a rectangle of 7 mm × 8 mm, and the opening shape of the outlet pipe is a circle having a diameter φ of 10 mm. The cross-sectional area S2 of the inlet pipe opening is about 56 mm ² and the cross-sectional area S1 of the outlet pipe opening is about 79 mm ² .

  In the present embodiment and the comparative example, the inlet opening of the outlet pipe and the outlet opening of the inlet pipe are separated by a certain distance.

  FIG. 4 shows the results of the performance test. Q (W) is the refrigeration capacity, P (W) is the refrigeration power consumption, COP (Coefficient Of Performance) and EER (energy efficiency ratio) both indicate the energy consumption efficiency. In addition to the embodiment and the comparative example, the table also shows the result of a hermetic compressor in which the inlet pipe and the outlet pipe of the suction muffler do not face each other as a reference example. As shown in FIG. 4, both the example and the comparative example have improved refrigeration capacity and energy consumption efficiency compared to the reference example. Moreover, the Example has the refrigerating capacity and energy consumption efficiency improved compared with the comparative example. That is, according to the hermetic compressor of the present embodiment, it has been proved that the energy efficiency is further improved as compared with the conventional configuration.

(Other embodiments)
In the first embodiment, the suction muffler 131 is configured such that the muffler main body 145 and the muffler cover 147 are formed as separate members and are tightly coupled to each other after assembly. However, the present invention is not limited to this. The muffler body and the muffler cover may be formed as an integral unit. For example, the suction muffler 131 may be integrally molded.

  In the first embodiment, the inlet opening 191 of the outlet pipe 153 is disposed to face the outlet opening 179 of the inlet pipe 149 in a substantially horizontal direction, but the opposing direction of both openings is arbitrary. For example, they may be arranged to face each other in a substantially vertical direction.

  From the foregoing description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  The hermetic compressor according to the present invention can be applied to a compressor used in a refrigeration cycle, and can be widely mounted in a refrigeration apparatus. Further, such a compressor can be deployed in various devices such as a home refrigerator, an air conditioner, a dehumidifier, a showcase, and a vending machine.

101 Sealed Container 103 Suction Pipe 111 Electric Element 113 Compression Element 131 Suction Muffler 145 Muffler Body 147 Muffler Cover 149 Inlet Pipe 153 Outlet Pipe 177 Center (F)
179 Exit opening 189 Center (G)
191 Entrance opening 193 Lower inner diameter wall

Claims (2)

A sealed container;
An electric element disposed in the sealed container;
A compression element driven by the electric element;
A suction pipe disposed in the sealed container for sucking refrigerant gas into the sealed container from the outside;
Equipped with a suction muffler having an internal space,
The inlet muffler has an inlet pipe having an outlet opening that has one end opened in the sealed container and the other end opened in the internal space of the suction muffler;
One end has an inlet opening that opens into the internal space of the suction muffler, and the other end includes an outlet pipe communicating with the compression chamber of the compression element;
A hermetic compressor, wherein an outlet opening of the inlet pipe and an inlet opening of the outlet pipe are arranged to face each other, and an inlet opening area of the outlet pipe is smaller than an outlet opening area of the inlet pipe.   The outlet opening of the inlet pipe and the inlet opening of the outlet pipe face each other in a substantially horizontal direction, and the center of the inlet opening of the outlet pipe is the center of the outlet opening of the inlet pipe and the outlet of the inlet pipe The hermetic compressor according to claim 1, which is located between a lower inner wall surface of the opening.

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