JP4872175B2 - Hermetic electric compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to noise reduction and high reliability of a hermetic electric compressor used in a refrigerator or the like.
[0002]
[Prior art]
The conventional hermetic electric compressor, there is one shown in JP-A-62-271974.
Hereinafter, the above-described hermetic electric compressor will be described with reference to the drawings.
[0003]
Figure 8 is a cross-sectional view of a conventional hermetic electric compressor. Figure 9 is a plan view of a leaf spring which constitutes the conventional hermetic electric compressor. FIG. 10 is a schematic view of a gap between a suction muffler and a cylinder head of a conventional hermetic electric compressor. FIG. 11 is a conceptual view of spring characteristics of a leaf spring in a conventional hermetic electric compressor.
[0004]
8 and 9, 1 denotes a closed container, for storing the refrigerating machine oil 2. An electric element 5 includes a stator 3 and a rotor 4. 6 the compression element driven by the electric element 5 is housed together in a sealed container 1.
[0005]
Next , details of the compression element 6 will be described below.
[0006]
Reference numeral 10 denotes a crankshaft, which has a main shaft portion 11 on which the rotor 4 is press-fitted and fixed , and an eccentric portion 12 formed eccentric to the main shaft portion 11. Reference numeral 20 denotes a cylinder block having a substantially cylindrical compression chamber 22 and a bearing portion 23 that supports the main shaft portion 11. 30 is a piston, is fitted into the compression chamber 22 are connected by a connecting means 31 between the eccentric portion 12.
[0007]
A valve plate 34 seals the end face of the compression chamber 22 and has a suction hole 35. 36 is a gasket provided on the surface of the valve plate 34, 37 is a cylinder head, which forms a high-pressure chamber and is fixed to the anti-compression chamber 22 side of the valve plate 34.
[0008]
39 is a suction tube, is fixed to the closed container 1, is connected to a low pressure side of the refrigeration cycle (not shown), directing the refrigerant gas (not shown) into hermetic container 1. Reference numeral 40 denotes a suction muffler made of resin, which forms a sound deadening space 42, and an extending portion 44 extends around the suction hole 35 of the valve plate 34. 46 is a leaf spring, in a space formed between the extending portion 44 and the cylinder head 37, and is fitted so as to impart an elastic force.
[0009]
The operation of the hermetic electric compressor configured as described above will be described below.
The rotor 4 rotates the crankshaft 10, and the eccentric motion of the eccentric portion 12 drives the piston 30 via the connecting means 31, so that the piston 30 reciprocates in the compression chamber 22 . Accordingly, the refrigerant gas introduced into the sealed container 1 through the suction tube 39 is sucked from the suction muffler 40, is continuously compressed in the compression chamber 22, passes through the valve plate 34 again, and passes through the sealed container 1 It is discharged into the refrigeration cycle without being released inside.
[0010]
At this time, the intermittent compression caused by the reciprocating motion of the piston 30, the pressure pulsation generated in the compression chamber 22 is flowing back part silencing space 42 of suction muffler 40, the plate spring 46, and the extending portion 44 the space formed between the cylinder head 37, by being fitted to impart elastic force to prevent the leakage of the pressure pulsation is attenuated by the muffling space within 42, to reduce noise. Further, the extension portion 44 is elastically pressed around the suction hole 35 to absorb the thermal expansion and sag of the suction muffler 40, and press and fix the suction muffler 40. Suppresses rattling.
[0011]
[Problems to be solved by the invention]
However, in the conventional configuration, the force being-assembled suction muffler, press a gap dimension of the extending portion 44 and the cylinder head 37 of the suction muffler forms, but determined by the spring constant of the leaf spring 46, if the suction muffler When the force to wear is weak and the resin muffler 40 rattles between the cylinder head 37, the leaf spring 46, and the gasket 36 , resin powder is generated from the resin muffler 40 , and the compressor There is a possibility that each sliding part of the sliding part is worn out, or the moving part is locked by entering the gap between the sliding parts, or abnormal noise is generated. Further , even if the force for pressing the suction muffler is too strong , the suction muffler may be deformed and destroyed in the course of long-term use.
[0012]
Therefore, in the conventional configuration, the spatial distance H1 formed by the extension portion 44 of the suction muffler and the cylinder head 37 shown in FIG. 10 and the spring force P1 determined from the spring characteristics of the leaf spring 46 shown in FIG. It is necessary to obtain an appropriate load for adjusting and fixing the suction muffler 40 by pressing.
[0013]
However, when considering the respective dimensional tolerances of the spatial distance 1 becomes a possible variation from Amin to Amax, accordingly, the spring force P1 is a possible variation Bmin, to Bmax. Therefore, in order to obtain an appropriate load that satisfies the above conditions, the variation in the spatial distance H1 due to the dimensional tolerance width of the extending portion 44 of the suction muffler 40 and the dimensional tolerance width of the cylinder head 37 is minimized, and the plate It is necessary to manage the variation in the height direction of the spring 46 within a very narrow tolerance range . As a result, processes such as parts processing and dimension selection are required, resulting in a large cost increase. In addition, the handling of parts is severe and there is a drawback that it is difficult to maintain the design quality.
[0014]
The present invention solves the conventional problems, and is based on the premise that there is a large variation in the spatial distance formed between the extension part of the suction muffler and the cylinder head. Thus, an object of the present invention is to provide a hermetic electric compressor that suppresses rattling of the suction muffler, is low in noise, and has high reliability.
[0015]
[Means for Solving the Problems]
According to a first aspect of the present invention, a compression element driven by an electric element is accommodated in a sealed container, a cylinder block having a compression chamber, a piston reciprocating in the compression chamber, and the compression chamber A valve plate that seals the opening end of the valve plate, a suction muffler that has one end communicating with the compression chamber via the valve plate, and the other end that opens into the sealed container, and an anti-compression chamber of the valve plate The compression element includes a cylinder head that is disposed on the side and forms a high-pressure chamber, and a cylinder head that presses the extension portion of the suction muffler against the valve plate via a leaf spring, and extends the suction muffler. the spatial distance between the output portion and the cylinder head, when heated above the maximum temperature for use of the compressor, the plate spring is sized to produce a plastic deformation, further wherein A suction muffler is formed of a resin material, and the cylinder head is formed of a material having a smaller linear expansion coefficient than that of the suction muffler, and the heat treatment above the maximum use temperature of the compressor is performed after the assembly of the compressor. Thus, it has the effect of self-adjusting the spring characteristics suitable for the spatial distance between the extension portion of the suction muffler and the cylinder head and making the pressing force of the suction muffler constant.
[0016]
Furthermore, the suction muffler is formed of a resin material, carrying out the cylinder head, the formed material having a smaller linear expansion coefficient than the suction muffler, heat treatment or a maximum temperature of use of the compressor, after the assembly of the compressor By doing so, it is possible to self-adjust spring characteristics that match the spatial distance obtained at higher temperatures than when the compressor is operating, and when the compressor is operating, the leaf spring is used in the elastic region with the temperature rising the being-assembled force to allow can be stabilized.
[0017]
The invention according to claim 2 of the present invention, Oite to the invention of claim 1, the extending portion of the suction muffler, providing a projection which projects into the cylinder head side together, the plate spring a hole having a burring provided, fitted to the hole in the protrusion, by the plate spring engaged with the extending portion, during assembly of the compressor, the sub-assembly of the suction muffler and the cylinder head This makes it easy to assemble the compressor .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a hermetic electric compressor according to the present invention will be described below with reference to the drawings .
[0019]
(Embodiment 1)
Figure 1 is a fragmentary cross-sectional view of the hermetic electric compressor according to a first implementation of the present invention. FIG. 2 is an enlarged view of main portions of a suction muffler and a leaf spring of the hermetic electric compressor according to the first embodiment. Figure 3 is a schematic diagram of the gap between the suction muffler and the cylinder Dahe head of the hermetic electric compressor according to the first the embodiment. Figures 4 to 6 are graphs showing the concept of the spring characteristics of the leaf spring of the hermetic electric compressor according to the first the embodiment.
[0020]
1 and 2, 101 in closed containers for storing refrigerating machine oil 102. An electric element 105 includes a stator 103 and a rotor 104. The 106 compression element driven by the electric element 105, are housed together in a sealed container 101.
[0021]
Next , details of the compression element 106 will be described below.
[0022]
Reference numeral 110 denotes a crankshaft, which has a main shaft portion 111 on which the rotor 104 is press-fitted and fixed , and an eccentric portion 112 formed eccentrically with respect to the main shaft portion 111. A cylinder block 120 includes a substantially cylindrical compression chamber 122 and a bearing portion 123 that supports the main shaft portion 111. 130 is a piston, is fitted into the compression chamber 122 are connected by a connecting means 131 between the eccentric portion 112. A valve plate 134 seals the end face of the compression chamber 122 and has a suction hole 135.
[0023]
136 gasket provided in the valve plate 134 surface, 137 in the cylinder head to form a high pressure chamber, a small aluminum linear expansion coefficient than the synthetic resin material obtained by die-casting, the anti-compression chamber 122 side of the valve plate 134 Fixed. 139 is a suction tube, is fixed to the hermetic container 101, is connected to a low pressure side of the refrigeration cycle (not shown), directing the refrigerant gas (not shown) into hermetic container 1.
[0024]
Reference numeral 140 denotes a suction muffler formed of a synthetic resin material such as PBT or PPS. The muffler space 142 is formed, and an extending portion 144 extends around the suction hole 135 of the valve plate 134. A leaf spring 146 is formed of a spring steel material, a spring cold rolled steel material, or the like, and has a spring characteristic as shown in FIG. Leaf spring 146, the space formed between the extension portion 144 and the cylinder head 137, and is fitted so as to impart an elastic force. In addition, the hermetic electric compressor of the present invention is one that is heated and dried after assembly to a temperature of 150 ° C. or higher, which is higher than the temperature in the vicinity of the suction muffler extension 144 during actual operation of the compressor. A space distance H2 (hereinafter referred to as a space distance) shown in FIG. 3 between the extending portion 144 and the cylinder head 137 is set to a dimension D shown in FIG.
[0025]
In the above configuration, the spatial distance H2 after assembly as shown in FIG. 4, but the C dimension, when thrown into the hot drying oven, the spatial distance H2, the extension portion 144 of the suction muffler Due to the difference in the linear expansion coefficient of the cylinder head 137, the cylinder head 137 contracts to the D dimension.
[0026]
At this time, when combined with the maximum dimension tolerance of the extension part 144 of the suction muffler and the minimum dimension tolerance of the cylinder head 137 , the spatial distance H2 becomes Dmin, and when the minimum dimension tolerance of the extension part 144 of the suction muffler is When the cylinder head 137 is combined at the maximum dimensional tolerance , the spatial distance H2 becomes Dmax. When the spatial distance H2 is Dmin and Dmax, the spring characteristics of the leaf spring 146 are plastically deformed as shown in FIG. since it is in the region, after the plastic deformation, the spring characteristics of the space-time distance H2 is Dmin varies the characteristics shown in FIG. 6, the spring characteristic during Dmax changes the characteristics shown in FIG.
[0027]
Further, abutting portions 144a of the leaf spring of the extending portion 144 of the suction muffler, by the spring force of the leaf spring, shrinkage deformation, the spatial distance H2 dimension, spread their respective E min, to a point of Emax. In addition, since the points of Dmin and Dmax are higher than the temperature of the extension part 44a of the suction muffler during the operation of the compressor , there is no point narrower than the points of Emin and Emax during the operation of the compressor. , spring characteristics of the leaf spring 146 is never reached again the plastic deformation region.
[0028]
Therefore, when the compressor is cold to hot, the compressor is operated in the stable elastic range of Fmin to Emin and Fmax to Emax , respectively, and the spring force P2 is Gmin, Gmax at Fmin, Fmax, respectively. , hot of Emin, respectively, in the Emax Hmin, Hmax, and the on combination tolerance of the extending portion 144 and the cylinder head 137 of the suction muffler, even in minimum space distance, even in the maximum spatial distance, respectively a similar spring A force P2 is obtained. As described above, the self-adjusting function that cancels the influence of the variation in the spatial distance H2 works, and the design spring force can be stably maintained without returning to the lifetime elastic range.
[0029]
Further, when cold the Fmin, the spring force P2 = Gmin at point of Fmax, Gmax, at the time of assembly of the compressor and, during transportation and, and during operation of the compressor, a force due to vibration or impact applied to the stop or the like Even if the suction muffler 140 is applied, the rattling of the suction muffler 140 can be easily suppressed by setting the suction muffler 140 to a load that can be sufficiently pressed and fixed.
[0030]
The operation of the hermetic electric compressor configured as described above will be described below.
[0031]
The rotor 104 rotates the crankshaft 110, and the eccentric motion of the eccentric portion 112 drives the piston 130 via the connecting means 131, so that the piston 130 reciprocates within the compression chamber 22 . Along with this, the refrigerant gas introduced into the sealed container 101 through the suction tube 139 is sucked from the suction muffler 140, continuously compressed in the compression chamber 122, passes through the valve plate 134 again , and then the sealed container 1 It is discharged into the refrigeration cycle without being released inside.
[0032]
At this time, the intermittent compression caused by the reciprocating motion of the piston 130, the pressure pulsation generated in the compression chamber 122 is flowing back part silencing space 142 of the suction muffler 140, the plate spring 146, the extension portion 144 the space formed between the cylinder head 137, is fitted so as to impart an elastic force, and the elastic force, sets the extension portion 144 so that the load can be sufficiently being-assembled fixed to the gasket in fact, the leaf spring 146 may be to its set load self adjusting to obtain a reliable set load. Therefore, without pressure pulsations leaks, is attenuated by the muffling space 142, it is possible to reduce noise.
[0033]
Further, the extending portion 144, around the suction hole 135, because it is always pressed against resiliently in set load, the leaf spring 146 absorbs the thermal expansion and fatigue, etc. of the suction muffler 140, press the suction muffler 140 It is securely fixed to prevent rattling caused by vibrations.
[0034]
As described above, according to the hermetic electric compressor of the first embodiment, on the premise that the variation in the spatial distance formed between the extending portion 144 of the suction muffler 140 and the cylinder head 137 is large. By obtaining a certain spring force, there is no need to minimize the variation in the dimensional tolerance width of the extension portion 144 of the suction muffler 140 and the spatial distance H1 due to the dimensional tolerance width of the cylinder head 137 , and the height of the leaf spring 146 is increased. the direction of variation also, not good just to manage in the general tolerance range. As a result, processes such as part processing and dimension selection are not required, and manufacturing costs can be greatly reduced . In addition, it is possible to provide a hermetic type electric compressor that can maintain the design quality by handling the parts normally, stably suppress the shakiness of the suction muffler, and is low in noise and highly reliable.
[0035]
(Embodiment 2)
FIG. 7 is an exploded perspective view of a hermetic electric compressor according to the second embodiment of the present invention. 7, 140 in the suction muffler, the extending portion 244 of the suction muffler 140 is provided with a protrusion 144b protruding cylinder head side. 146 is a leaf spring, that has provided a hole 146b having a burring 146a stood in a counter-suction muffler side.
[0036]
In the above configuration, the protrusion 144b of the suction muffler, by inserting a hole 146b of the leaf spring, the protrusion 144b is press-fitted into the burring 146a, to provisionally stop the leaf spring 146 to the suction muffler 140 Can do. Thereby, the subassembly of a suction muffler and a leaf | plate spring is attained with a suction muffler before this assembly, and the assembly property of a compressor can be improved.
[0037]
【Effect of the invention】
As described above, the invention according to claim 1, in closed container, houses a compression element driven by the electric element, a cylindrical Dabu lock having a compression chamber, a piston reciprocating in said compression chamber the a valve plate that seals the open end of the compression chamber, and the suction muffler having one end communicating with the compression chamber through the valve plate, forms a silencing space the other end is open to the closed container, said valve plate disposed in the counter-compression chamber side of, to form a high pressure chamber, wherein the extending portion of the suction muffler, and a cylinder head for being-assembled to the valve plate via a leaf spring configuration of the compression element, wherein the spatial distance between said extending portion of the suction muffler cylinder head, said plate spring is plastically deformed as a raw Ji that size, further, the suction muffler, a resin material As well as formed, the cylinder head, the formed material having a smaller linear expansion coefficient than the suction muffler, the maximum temperature or heat treatment used in the compressor, which was carried out after assembly of the compressor, said suction muffler Even if there is a variation in the spatial distance between the extension part and the cylinder head, the leaf springs can be plastically deformed according to the variation distance, so that the spring characteristics of the leaf spring can be matched to each spatial distance. to self-adjusting to the characteristics, the variation of the being-assembled force of the suction muffler is reduced. As a result, a guarantee design that suppresses rattling of the suction muffler is facilitated, and a more reliable compressor can be provided.
[0038]
Furthermore, the suction muffler, thereby forming a resin material, said cylinder head, said forming material having a smaller linear expansion coefficient than the suction muffler, a heat treatment or a maximum temperature of use of the compressor, the assembly of the compressor By carrying out later, it is possible to self-adjust spring characteristics suitable for the spatial distance obtained at a higher temperature than when the compressor is operating . As a result, the pressing force is stabilized so that the leaf spring can be used in the elastic region even when the temperature rises during operation of the compressor.
[0039]
The invention according to claim 2 of the present invention, Oite to the invention of claim 1, the extending portion of the suction muffler, providing a projection which projects into the cylinder head side together, the plate spring provided a hole having a bar-ring, the hole portion fitted into the protrusion, obtained by engaging the plate spring to the extending portion, during assembly of the compressor, the suction muffler and the cylinder over head sub By enabling assembly, assembly and productivity can be improved.
[Brief description of the drawings]
[1] The present invention of the hermetic electric compressor in the first embodiment according to the sectional view Figure 2 of the hermetic electric compressor according to the first same facilities enlarged sectional view [FIG 3] of embodiment 1 of the same embodiment spatial distance of the suction muffler and the cylinder head and the clearance of the schematic diagram Figure 4 cLEARANCE and leaf spring view characteristics showing a spring load [5] of the embodiment 1 of the embodiment 1 of the leaf spring FIG. 6 is a characteristic diagram showing a change in spring load at the maximum. FIG. 6 is a characteristic diagram showing a change in spring load when the spatial distance of the leaf spring of the first embodiment is the minimum. FIG. plan view of the leaf spring in a cross-sectional view of the perspective view of the suction muffler and the leaf spring 8 conventional hermetic electric compressor 9 conventional hermetic electric compressor in the second embodiment of the compressor [10 ] Suction muffler and cylinder head in conventional hermetic electric compressor Schematic diagram of the gap with the lid [FIG. 11] Conceptual diagram of spring characteristics of the leaf spring in the conventional hermetic electric compressor [Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 Airtight container 105 Electric element 106 Compression element 111 Main shaft part 120 Cylinder block 122 Compression chamber 130 Piston 134 Valve plate 136 Gasket 137 Cylinder head 140 Suction muffler 142 Suction muffler muffler space 144 Suction muffler extension part 144b Suction muffler projection part 146 leaf spring 146a burring 146b hole

Claims (2)

A compression element driven by an electric element is accommodated in an airtight container, a cylinder block having a compression chamber, a piston that reciprocates in the compression chamber, a valve plate that seals an open end of the compression chamber, and one end Is connected to the compression chamber via the valve plate, the other end is disposed on the side opposite to the compression chamber of the valve plate, forming a silencing space that opens into the sealed container, and forms a high-pressure chamber, The compression element includes a cylinder head that presses the extension portion of the suction muffler to the valve plate via a leaf spring, and a spatial distance between the extension portion of the suction muffler and the cylinder head is set. , when heated above the maximum temperature for use of the compressor, the plate spring is sized to produce a plastic deformation, further the suction muffler, the form of a resin material As well as, the cylinder head, the formed material having a smaller linear expansion coefficient than the suction muffler, the maximum temperature or heat treatment using a compressor, hermetic electric compressor that is carried out after the assembly of the compressor. The extension part of the suction muffler is provided with a protrusion protruding to the cylinder head side, a hole with a burring is provided in the leaf spring, the hole is fitted into the protrusion, and the leaf spring is The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is locked to the extending portion.