JP2012021400A - Sealed type compressor and refrigerator equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed type compressor with improved efficiency of compression by reducing an ineffective volume formed by a suction reed valve, and a refrigerator equipped therewith.SOLUTION: The sealed type compressor, in which a drive part is housed in a sealed container, and a piston provided to a drive shaft driven by the drive part reciprocates in a compression chamber, includes a valve seat provided in an opening end of the compression chamber and having a suction bore, and a suction valve plate provided between the valve seat and the opening end of the compression chamber and having the suction reed valve for opening and closing the suction bore. The suction reed valve is integrally formed with the suction valve plate with a clearance therebetween so as to have a fixed end and a free end, the fixed end is provided with a bridge having a width smaller than the suction reed valve, and the fixed end of the suction reed valve is linked to the suction valve plate via the bridge, characteristically.

Description

  The present invention relates to a hermetic compressor and a refrigerator including the same.

  As background art in this technical field, there is JP-A-8-151977 (Patent Document 1). Patent Document 1 describes that in a valve device, a suction-type reed valve having a tongue shape is provided on a suction side valve body made of an elastic member by forming a slit.

JP-A-8-151977

  However, in the configuration described in Patent Document 1, the ineffective volume increases as the slit portion increases. For example, in the suction process, the high-pressure refrigerant that stays in the invalid volume is re-expanded in the compression chamber. Therefore, since the amount of refrigerant sucked into the compression chamber is reduced, the suction efficiency is lowered and the compression efficiency is lowered. Further, in the compression process, the ineffective volume is large, so that the refrigerant discharge efficiency is lowered.

  Further, when the suction reed valve is formed together with the slit by die cutting, the end surface after the die cutting leaves scratches, burrs, edges and the like. If these remain, there is a risk of fatigue failure due to repeated opening and closing operations of the suction reed valve. Therefore, a finishing process such as barrel polishing is important for the end face. However, if the slit is small, the end face of the suction reed valve cannot be polished sufficiently and becomes rough.

  Then, this invention aims at providing the hermetic compressor which improved compression efficiency by reducing the ineffective volume which a suction reed valve forms, and a refrigerator provided with the same.

  In order to solve the problem, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-mentioned problems. For example, a drive unit is housed in a sealed container, and a piston provided on a drive shaft driven by the drive unit reciprocates in the compression chamber. In a moving hermetic compressor, a valve seat provided at an opening end portion of the compression chamber and having a suction hole, and provided between the valve seat and the opening end portion of the compression chamber, opens and closes the suction hole. A suction valve plate having a suction reed valve, wherein the suction reed valve is formed integrally with the suction valve plate so as to have a fixed end and a free end, and is formed on the fixed end. Is provided with a bridging portion having a width smaller than that of the suction reed valve, and the fixed end portion of the suction reed valve is connected to the suction valve plate through the bridging portion.

  According to the present invention, it is possible to provide a hermetic compressor with improved compression efficiency by reducing the ineffective volume formed by the suction reed valve.

Sectional drawing which shows the whole structure of the hermetic compressor in one Example of this invention. AA sectional view taken on the line AA of FIG. The principal part disassembled perspective view of the hermetic compressor in one example of the present invention. The top view of the suction valve plate in one Example of this invention. The perspective view in the state where the suction reed valve in one example of the present invention operated. The enlarged view of the end surface of the suction reed valve in one Example of this invention. The enlarged view of the end surface of the suction reed valve in a comparative example. It is sectional drawing of the refrigerator of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the hermetic compressor of this embodiment is formed by joining an upper container 1 a and a lower container 1 b to form a hermetic container 1. Inside the hermetic container 1, there are provided a compression unit 10 that compresses the refrigerant, and a drive unit 21 that gives power to compress the refrigerant.

  As shown in FIG. 2, on one side and the other side of the sealed container 1, as shown in FIG. 2, a suction joint pipe 2 that guides an external refrigerant to the inside of the sealed container 1, and the refrigerant compressed by the compression unit 10 A discharge joint pipe 3 for discharging to the outside is provided.

  The compression unit 10 includes a cylinder block 11 in which a compression chamber 11a for compressing a refrigerant is formed, and a piston 12 that reciprocates linearly inside the compression chamber 11a to compress the refrigerant.

  The compression part 10 and the drive part 21 are engaged via the rotating shaft 13 provided with the eccentric shaft part 13a. A valve seat cover 14, a suction silencer 15, and a valve component 16 are attached to the top of the cylinder block 11, that is, the compression chamber opening end face 11b. The valve component 16 will be described later. Further, a seal member 16a is provided between the valve seat cover 14 and the valve component member 16, and closes the gap.

  As shown in FIG. 3, the valve component 16 includes a discharge valve 17, a valve seat 18 having a suction hole 18 a and a discharge hole 18 b, and a suction valve plate 19. The valve component 16 controls the flow of refrigerant sucked into the compression chamber 11a from the suction silencer 15 and refrigerant discharged from the compression chamber 11a into the discharge chamber 14a of the valve seat cover 14.

  Discharge mufflers 14 b and 14 c communicating with the discharge chamber 14 a of the valve seat cover 14 are connected to the valve seat cover 14. Further, one end of the discharge pipe 20 is connected to the discharge muffler 14c, and the other end is connected to the discharge joint pipe 3 (see FIG. 3).

  The drive unit 21 provides a driving force for the piston 12 to reciprocate inside the compression chamber 11a, and a stator 22 elastically supported inside the hermetic container 1 and an inner part of the stator 22 A rotor 23 that is separated from the periphery and interacts electromagnetically with the stator 22 is provided.

  One end of a rotating shaft 13 that rotates together with the rotor 23 is directly connected to the center of the rotor 23, and the piston 12 is slidably fitted to the eccentric shaft portion 13a at the other end.

  In FIG. 1, the support bearing 24 serves as a support frame for the compression unit 10 and the drive unit 21, and supports the rotation of the rotating shaft 13 and the rotor 23.

  Next, the configuration of the suction valve plate 19 will be described in detail with reference to FIGS. The suction valve plate 19 is formed by punching a thin steel plate with a press machine. The suction valve plate 19 is disposed between the valve seat 18 and the compression chamber opening end face 11b. The suction valve plate 19 includes a suction reed valve 30 and a suction reed valve support plate portion 40 that surrounds the suction reed valve 30 with a gap 30a therebetween. The gap 30a is formed by punching a thin steel plate, for example, and the suction reed valve 30 is formed at this time.

  The suction valve plate 19 is provided with a fastening hole 42 at a corner, and is fastened to the compression chamber opening end surface 11b by several fastening members 35 (for example, bolts). The compression chamber opening end surface 11b is processed into a highly accurate plane, and is assembled with the suction valve plate 19 sandwiched between the compression chamber opening end surface 11b and the joint surface of the valve seat 18, The compression chamber 11a is kept airtight.

  Therefore, the suction reed valve support plate portion 40 does not directly open and close the suction reed valve 30.

  The suction reed valve 30 has a structure including a fixed end portion 31 and a free end portion 32. The free end portion 32 is located at the opening projection position of the compression chamber opening end face 11b, that is, on the inner diameter side of the compression chamber 11a opening, and has a function of opening and closing the suction hole 18a of the valve seat 18. The fixed end portion 31 is disposed outside the compression chamber opening end surface 11b. Similarly to the suction reed valve support plate portion 40, the fixed end portion 31 is held and fixed by being sandwiched between the compression chamber opening end surface 11b and the joint surface of the valve seat 18 facing this surface.

  Between the fixed end portion 31 of the suction reed valve 30 and the suction reed valve support plate portion 40, a bridging portion 41 that connects them is provided. That is, the bridging portion 41 is disposed on the fixed end portion 31 side opposite to the free end portion 32 of the suction reed valve 30. The bridging portion 41 has a function of positioning the suction reed valve 30 with respect to the suction reed valve support plate portion 40. The width dimension of the bridging portion 41 is smaller than the width of the suction reed valve 30. In particular, the range of 2 to 10 times the width of the suction valve plate 19 is desirable. If it is this range, the lift-up at the time of grinding | polishing mentioned later is controlled appropriately, and the finishing roughness of the end surface of the suction reed valve 30 improves. Further, the length of the bridging portion 41 is shorter than the length from the fixed end portion 31 to the free end portion 32 of the suction reed valve 30, and is located outside the opening of the compression chamber opening end surface 11b.

  In the present embodiment, a pair of bridging portions 41 are provided at positions outside the width of the free end portion 32, thereby improving positioning accuracy and appropriately controlling lift-up of the suction reed valve 30 during polishing. . In addition, if the same effect can be show | played, the bridge | crosslinking part 41 may be single or multiple. Further, since the bridging portion 41 is sandwiched and fixed between the joint surface between the compression chamber opening end surface 11b and the valve seat 18, there is no functional problem in strength even if the bridging portion 41 has a small width dimension.

  In the hermetic compressor of the present embodiment, when the drive unit 21 is energized, the rotor 23 rotates due to an electrical interaction between the stator 22 and the rotor 23, and the rotary shaft directly connected to the rotor 23 rotates. 13 rotate together. Then, the piston 12 fitted and connected to the eccentric shaft portion 13a of the rotary shaft 13 reciprocates linearly inside the compression chamber 11a.

  When the piston 12 linearly reciprocates inside the compression chamber 11a, the refrigerant outside the sealed container 1 passes through the suction joint pipe 2 and is sucked into the sealed container 1 in the suction process. Thereafter, the air passes through the suction silencer 15 and passes through the suction hole 14d of the valve seat cover 14 and the suction hole 18a of the valve seat 18 and is sucked into the compression chamber 11a.

  In the discharge process, the refrigerant sucked into the compression chamber 11 a is compressed in the compression chamber 11 a, passes through the discharge hole 18 b of the valve seat 18, and is discharged into the discharge chamber 14 a of the valve seat cover 14. Thereafter, the gas passes through the discharge mufflers 14 b and 14 c, the discharge pipe 20, and the discharge joint pipe 3 and is discharged to the outside of the sealed container 1.

  In the suction process, the suction reed valve 30 opens the suction hole 18 a of the valve seat 18, and the discharge valve 17 closes the discharge hole 18 b of the valve seat 18. On the other hand, in the discharge process, the suction reed valve 30 closes the suction hole 18 a of the valve seat 18, and the discharge valve 17 opens and closes to open the discharge hole 18 b of the valve seat 18. By repeatedly performing such a process, the refrigerant is compressed.

  In the present embodiment, the suction valve plate 19 includes two elements, a suction reed valve 30 and a suction reed valve support plate portion 40, and the suction reed valve 30 is supported by the suction reed valve support plate portion 40 by a bridging portion 41. Is done. Thereby, since the suction reed valve 30 is integrally formed on one plate, assembly is easy.

  Next, processing of the end face of the suction reed valve 30 will be described. As shown in FIG. 5, the suction reed valve 30 is lifted up in the refrigerant suction process. When the end face B of the suction reed valve 30 is rough, the gap 30a must be increased accordingly, and the ineffective space increases. When the invalid space increases, the compression performance deteriorates. Therefore, in this embodiment, the end face B is barrel-polished after punching.

  Next, the suction reed valve of the present embodiment and the end faces of the conventional suction reed valve will be compared and described with reference to FIGS. FIG. 6 is an enlarged view of the end face B of the suction reed valve 30 in the present embodiment, and is a partially enlarged view after barrel polishing. In FIGS. 6 and 7, five samples are shown side by side.

  The width dimension of the clearance of the suction valve plate is 0.7 mm in the case of the conventional suction valve plate of FIG. 7, and the width dimension of the clearance 30a of the suction valve plate 19 of this embodiment of FIG. 6 is 0.3 mm. Design and barrel polishing.

  Comparing FIG. 6 and FIG. 7, it can be seen that FIG. 6 showing this embodiment has a better finished surface in each sample. In this embodiment, this is because the suction reed valve 30 is connected to the suction reed valve support plate portion 40 at the bridging portion 41. That is, in the barrel polishing finishing operation, the suction reed valve 30 is lifted up with respect to the suction reed valve support plate portion 40 with the bridging portion 41 as a starting point, so that the end face B of the suction reed valve 30 is opened from the gap 30a. This is because the barrel polishing finish on the end face of the suction reed valve 30 is efficiently performed.

  In particular, even when the gap 30a is narrowed, the lift-up is performed with the bridging portion 41 as a base point, so that the barrel polishing finish on the end surface of the suction reed valve 30 can be appropriately performed.

  As shown in FIG. 8, if the above-described hermetic compressor is installed in the refrigerator 100, the compression efficiency can be improved, the cooling efficiency can be improved, and the power consumption of the refrigerator 100 can be reduced.

  In the refrigerator 100, a refrigerator compartment 103, a freezer compartment 104, and a vegetable compartment 105, each having a different temperature range, are divided in order from the top in a heat insulating box 100a. Behind the freezer compartment 104 is an evaporator chamber 51a in which the evaporator 51 is housed. Above the evaporator 51, there is provided a blower 52 that circulates the cold air heat-exchanged by the evaporator 51 by blowing it to each storage chamber. The hermetic compressor 50 is installed in a machine room 102 behind a refrigerated temperature zone (a vegetable room 105 in this embodiment, but may be a refrigerated room 103).

  In other words, the hermetic compressor 50 that is heated to a high temperature is installed behind a relatively high temperature storage chamber. On the other hand, the evaporator 51 is installed behind a relatively low temperature storage room.

  The hermetic compressor 50, the condenser, the pressure reducing mechanism, and the evaporator 51 form a refrigeration cycle. The refrigerant sent to the discharge pipe is returned again into the hermetic compressor 51 through the condenser, the decompression mechanism, and the evaporator 51. In this refrigeration cycle, a hydrocarbon-based refrigerant (HC refrigerant) such as propane (R290) or isobutane (R600a) is used.

  As described above, according to the present invention, in the hermetic compressor and the refrigerator including the same, the end face of the suction reed valve has a good roughness, and a stable suction valve plate with few scratches, burrs, edges, and the like can be obtained. And compression efficiency can be improved.

DESCRIPTION OF SYMBOLS 1 Sealed container 1a Upper container 1b Lower container 2 Suction joint pipe 3 Discharge joint pipe 10 Compression part 11 Cylinder block 11a Compression chamber 11b Compression chamber opening end surface 12 Piston 13 Rotating shaft 13a Eccentric shaft part 14 Valve seat cover 14a Discharge chambers 14b and 14c Discharge muffler 15 Suction silencer 16 Valve component 17 Discharge valve 18 Valve seat 18a Suction hole 18b Discharge hole 19 Suction valve plate 20 Discharge pipe 21 Drive unit 22 Stator 23 Rotor 24 Support bearing 30 Suction reed valve 30a Clearance 31 Fixed end 32 Free end portion 35 Fastening member 40 Suction reed valve support plate portion 41 Bridge portion 42 Fastening hole

Claims (6)

In a hermetic compressor in which a drive unit is housed in a sealed container and a piston provided on a drive shaft driven by the drive unit reciprocates in a compression chamber.
A valve seat provided at the opening end of the compression chamber and having a suction hole;
A suction valve plate provided between the valve seat and the opening end of the compression chamber and having a suction reed valve that opens and closes the suction hole, and
The suction reed valve is integrally formed with a gap in the suction valve plate so as to have a fixed end and a free end,
The fixed end portion is provided with a bridging portion having a smaller width than the suction reed valve, and the fixed end portion of the suction reed valve is connected to the suction valve plate via the bridging portion Hermetic compressor.   2. The hermetic compression according to claim 1, wherein the bridging portion is shorter than a length from the fixed end portion to the free end portion of the suction reed valve and is located outside the opening of the compression chamber. Machine.   2. The hermetic compressor according to claim 1, wherein the bridging portion has a width that is twice to ten times the width of the suction valve plate.   The hermetic compressor according to claim 1, wherein two bridging portions are provided at intervals.   The fixed end portion of the suction reed valve is fixed between the opening end surface of the compression chamber and the valve seat, and the free end portion is located on the inner diameter side of the opening end surface of the compression chamber. The hermetic compressor according to claim 1. A refrigerated temperature zone and a freezing temperature zone partitioned into a heat insulating box,
An evaporator partitioned and installed behind the freezing temperature zone chamber;
A hermetic compressor installed on the rear side of the refrigerated temperature zone;
In a refrigerator comprising: a hermetic compressor, a condenser, a decompression unit, and a refrigeration cycle configured by pipe connection of the evaporator in order,
The hermetic compressor is a hermetic compressor in which a driving unit is housed in a hermetic container and a piston provided on a driving shaft driven by the driving unit reciprocates in a compression chamber,
A valve seat provided at the opening end of the compression chamber and having a suction hole;
A suction valve plate provided between the valve seat and the opening end of the compression chamber and having a suction reed valve that opens and closes the suction hole, and
The suction reed valve is integrally formed with a gap in the suction valve plate so as to have a fixed end and a free end,
The fixed end portion is provided with a bridging portion having a smaller width than the suction reed valve, and the fixed end portion of the suction reed valve is connected to the suction valve plate through the bridging portion. refrigerator.

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