JP2009191764A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor of high refrigeration capacity and efficiency in which a suction reed opens earlier and it is made easier to fill refrigerant into a compression chamber since the suction reed is pushed and opened by expansion force of high pressure refrigerant remaining in a recess. <P>SOLUTION: A valve plate 133 is provided with the recess 141 surrounding a whole circumference or a part of a suction hole 131 at a seat surface 138 of the valve plate 133 on which a head part 139 of the suction reed 135 is seated, and is provided with an extended groove 143 providing communication between a non-seating surface 142 on which the head part 139 is not seated and the recess 141. Also, the valve plate is provided with a suction read seat surface 145 formed by the recess 141 and the suction hole 131. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used in a refrigeration cycle such as a household refrigerator, a vending machine, an air conditioner, and a heat pump.

  This type of hermetic compressor stores an electric element and a mechanical element together with a refrigerant in a hermetic container, and includes a valve plate fixed to the opening end of the cylinder and a suction lead that opens and closes the suction hole. Thus, the operation of sucking and discharging the refrigerant is performed. In recent years, high efficiency has been demanded by improving the operability of the suction lead (for example, see Patent Document 1).

  The conventional hermetic compressor will be described below with reference to the drawings.

  FIG. 6 is a front view of a conventional hermetic compressor described in Patent Document 1 in which a hermetic container is cut out and the internal components are viewed with the cylinder side facing forward, and FIG. 7 is a conventional hermetic compressor. It is a longitudinal cross-sectional view at the time of cutting a machine into right and left. FIG. 8 is an enlarged cross-sectional view of the main part of FIG. 7, and is a cross-sectional view of the main part of the suction stroke in which the suction lead is opened.

  6 to 8, the airtight container 1 is filled with the refrigerant 2, the refrigerating machine oil 3 is stored on the bottom surface, and both the electric element 4 and the compression element 5 are elastically supported in the airtight container 1. .

  The electric element 4 includes a rotor 11 and a stator 12. The electric element 4 is disposed above the compression element 5 and is driven by the electric element 4.

  Next, details of the compression element 5 will be described below.

  The shaft 13 includes a main shaft portion 14 that engages and locks the rotor 11, and an eccentric portion 15 that is formed eccentric to the main shaft portion 14. The cylinder block 21 has a substantially cylindrical cylinder 22. A piston 23 is loosely fitted in the cylinder 22, and the piston 23 is connected to the eccentric portion 15 by a connecting means 24.

  A suction pipe 31 for sucking the refrigerant 2 from a refrigeration cycle (not shown) outside the sealed container 1 is attached through the sealed container 1, and the suction pipe 31 is connected via a joint spring 32 and a suction pipe 33. The suction muffler 34 is made of a heat-insulating plastic such as PBT.

  The suction muffler 34 communicates with the suction port 36 of the cylinder head 35. The cylinder head 35 is fixed by sandwiching a valve plate 37 in the cylinder block 21.

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

  When electricity is supplied to the stator 12 of the electric element 4, the rotor 11 rotates and the main shaft portion 14 fitted and locked to the rotor 11 rotates.

  As the main shaft portion 14 rotates, the eccentric portion 15 of the shaft 13 performs an eccentric motion, and the piston 23 connected to the eccentric portion 15 by the connecting means 24 reciprocates in the cylinder 22, and the refrigerant in the compression chamber 41. 2 inhalation and compression are repeated.

  The refrigerant 2 passes through a suction pipe 31 fixed to the sealed container 1 from a refrigeration cycle (not shown) outside the sealed container 1, and is sucked into the suction muffler 34 through a joint spring 32 and a suction pipe 33.

The suction muffler 34 communicates with a suction port 36 of the cylinder head 35, and a suction hole 38 formed in the suction port 36 and the valve plate 37. The refrigerant 2 is opened when the suction lead 39 is opened. And is sucked into the compression chamber 41 through the suction hole 38.
JP 2000-291559 A

  However, in the above-described conventional configuration, since the adhesion force due to the viscosity of the refrigerating machine oil 3 adhering between the suction lead 39 and the valve plate 37 is large, the suction stroke proceeds and the pressure in the compression chamber 41 greatly decreases. The suction lead 39 is not opened, and the start of suction of the refrigerant 2 into the compression chamber 41 is delayed, and an increase in suction loss, a decrease in refrigerating capacity due to an insufficient amount of refrigerant 2 filled in the compression chamber 41, and a decrease in efficiency. It had the problem of occurring.

  The present invention solves the above-described conventional problems, and since the suction lead is quickly opened and the refrigerant is sucked into the compression chamber with the start of the suction stroke, the suction type has a small suction loss, a high refrigerating capacity and high efficiency. An object is to provide a compressor.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention includes a suction lead having a head portion that opens and closes the suction hole, and the entire circumference of the suction hole is formed on the seating surface of the valve plate on which the head portion is seated. Alternatively, a recess that surrounds a part is provided, and an extension groove that communicates the recess and the non-sitting surface on which the head is not seated is provided. During the compression stroke, high-pressure refrigerant is guided to the recess through the extension groove. Since the suction lead is pushed open by the high pressure of the refrigerant accumulated in the recess as the suction stroke starts, the suction lead opens faster.

  The hermetic compressor of the present invention includes a suction lead having a head part that opens and closes the suction hole, and a seating surface of the valve plate on which the head part is seated is provided with a recess surrounding the entire circumference or part of the suction hole. With an extension groove that communicates the recess and the non-sitting surface where the head does not sit, the suction lead opens quickly with the start of the suction stroke, and the refrigerant is sucked into the compression chamber, so the suction loss is small, A hermetic compressor with high refrigerating capacity and efficiency can be provided.

  According to a first aspect of the present invention, there is provided a cylinder formed in a cylinder block, a piston inserted reciprocally in the cylinder, a valve plate provided at an end of the cylinder and having a suction hole formed therein. A suction lead formed by a leaf spring material and provided on the cylinder side of the valve plate to open and close the suction hole, and the suction lead includes a head portion that opens and closes the suction hole. The seating surface of the valve plate to be seated is provided with a recess surrounding the entire circumference or part of the suction hole, and an extension groove that communicates the recess with a non-sitting surface on which the head is not seated. During the compression stroke, the high-pressure refrigerant is introduced into the recess surrounding the suction hole through which the head portion is seated via the extending groove, and stored in the recess as the suction stroke starts. The high-pressure pressure pushes the suction lead open, and as the suction stroke starts, the suction lead opens quickly and sucks refrigerant into the compression chamber. Can be provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the ratio of the projected area of the recess to the projected area of the suction hole is in the range of 1% to 5%. In addition to the effect of the invention according to claim 1, in addition to the effect of the invention according to claim 1, a recess for storing a minimum of high-pressure refrigerant is provided so that the suction lead can be quickly opened. The charging amount of the refrigerant into the compression chamber is improved, high refrigeration capacity is obtained, and efficiency can be improved.

  The invention according to claim 3 is the invention according to claim 1 or 2, further comprising a suction lead sheet surface formed by a recess and a suction hole, and a projected area of the suction lead sheet surface with respect to a projected area of the suction hole. The ratio is 3% to 60%, ensuring sealing between the suction hole and the recess, and suppressing the viscous resistance of the refrigerating machine oil adhering between the suction lead sheet surface and the suction lead. Therefore, in addition to the effect of the invention described in claim 1 or 2, the suction lead opens more quickly while ensuring the sealing performance on the suction lead sheet surface, and the amount of refrigerant filled in the compression chamber is reduced. It is possible to improve and obtain a high refrigeration capacity and to improve the efficiency.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the suction lead sheet surface is annular and the width is in the range of 0.3 mm to 0.8 mm. The sealability between the suction hole and the recess can be ensured, and the viscous resistance of the refrigerating machine oil adhered between the suction lead sheet surface and the suction lead can be suppressed, so that any one of claims 1 to 3 can be used. In addition to the effects of the invention described in the item, the suction lead opens more quickly while ensuring the sealing performance on the suction lead sheet surface, the amount of refrigerant filled in the compression chamber is improved, and high refrigeration capacity is obtained. Further, the efficiency can be improved, and further, the processing is easy, so the number of processing steps can be reduced and the manufacturing can be performed at low cost.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the cross-sectional area of the extending groove communicating with the non-sitting surface is greater than the opening on the non-sitting surface side. It is formed so as to reduce the cross-sectional area of the opening on the hole side, and during the compression stroke, the high-pressure refrigerant is easily guided to the recess surrounding the suction hole where the head portion is seated via the extension groove, Further, immediately after the start of the suction stroke, the high-pressure refrigerant filled in the recess can be made difficult to leak from the extension groove, and in addition to the effect of the invention according to any one of claims 1 to 4, The suction lead opens faster, the amount of refrigerant filled in the compression chamber is improved, high refrigeration capacity is obtained, and efficiency can be improved.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the concave portion has a substantially V-shaped cross-sectional shape, and the projected area of the concave portion facing the head portion is determined. Since the volume of the recess can be reduced while maintaining, the amount of re-expansion loss due to the refrigerant accumulated in the recess can be suppressed, and in addition to the effect of the invention according to any one of claims 1 to 5. In addition, the amount of refrigerant filled in the compression chamber is improved, high refrigeration capacity is obtained, and efficiency can be improved.

  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 longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention, FIG. 2 is a front view of a valve plate in the hermetic compressor of the same embodiment, and FIG. 3 is relative to a suction lead. FIG. 4 is a longitudinal sectional view taken along the line AA in FIG. 2, and FIG. 5 is a front view of the suction lead in the hermetic compressor according to the embodiment.

  In FIG. 2, in order to explain the relative position of the suction lead 135 with respect to the valve plate 133, the suction lead 135 is indicated by a dotted line.

  In FIGS. 1 to 5, the sealed container 101 is filled with the refrigerant 103, the refrigerating machine oil 105 is stored on the bottom surface, and both the electric element 107 and the compression element 109 are elastically supported in the sealed container 101.

  The electric element 107 includes a rotor 111 and a stator 113. The electric element 107 is disposed below the compression element 109 and is driven by the electric element 107.

  Next, details of the compression element 109 will be described below.

  The shaft 115 includes a main shaft portion 117 that engages and locks the rotor 111, and an eccentric portion 119 that is formed eccentric to the main shaft portion 117. The cylinder block 121 has a substantially cylindrical cylinder 123, and a piston 125 is loosely fitted in the cylinder 123, and the piston 125 is connected to the eccentric portion 119 by a connecting means 127.

  One end of the opening end of the cylinder 123 is closed by the piston 125, and the other end is provided on the side of the cylinder 123 of the valve plate 133 having the suction hole 131 and the valve plate 133 to open and close the suction hole 131. A compression chamber 137 is formed in the cylinder 123 by being blocked by the suction lead 135.

  The suction lead 135 includes a head portion 139 that opens and closes the suction hole 131.

  The valve plate 133 is provided with a recess 141 surrounding the entire circumference or part of the suction hole 131 on the seating surface 138 of the valve plate 133 on which the head portion 139 of the suction lead 135 is seated, and the non-sitting surface on which the head portion 139 is not seated. An extension groove 143 that communicates 142 and the recess 141 is provided. In addition, a suction lead sheet surface 145 formed by the recess 141 and the suction hole 131 is provided.

  The sucked refrigerant 103 passes through a suction hole 131 formed in the valve plate 133 from the suction chamber 147 and is guided to the compression chamber 137 after the suction lead 135 is opened.

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

  When electricity is supplied to the stator 113 of the electric element 107, the rotor 111 rotates, and the main shaft portion 117 fitted and locked to the rotor 111 rotates.

  The eccentric portion 119 of the shaft 115 performs an eccentric motion by the rotation of the main shaft portion 117, and the piston 125 connected to the eccentric portion 119 by the connecting means 127 reciprocates in the cylinder 123, and the refrigerant in the compression chamber 137. 103 inhalation and compression are repeated.

  The suction lead 135 is pushed and bent inside the compression chamber 137 during the suction stroke, whereby the suction hole 131 formed in the valve plate 133 is opened and the low-pressure refrigerant 103 is sucked into the compression chamber 137. .

  On the other hand, during the compression stroke, when the pressure in the compression chamber 137 becomes higher than the pressure in the suction hole 131 due to an increase in the pressure in the compression chamber 137, the head portion 139 of the suction lead 135 closes the suction hole 131, and then The pressure further increases due to the volume change in the compression chamber 137, and the high-pressure refrigerant 103 is discharged from a discharge hole (not shown).

  In order to open the suction lead 135 in the suction stroke, the force (F1) for opening the suction lead 135 needs to exceed the force (F2) for suppressing the opening.

  Here, the force (F1) for opening the suction lead 135 is the pressure difference (P) between the pressure in the suction chamber 147 and the pressure in the compression chamber 137, and the projected area (A) of the suction hole 131 formed in the valve plate 133. ) And an expansion force (E) due to the high-pressure refrigerant stored in the recess 141.

  Further, the force (F2) for suppressing the opening of the suction lead 135 is the refrigeration adhering between the spring force (a) of the suction lead 135 and the suction lead 135 and the suction lead sheet surface 145 provided on the valve plate 133. The adhesion force (b) due to the viscosity of the machine oil 105 is added.

  Here, the spring force (a) of the suction lead 135 is affected by the plate thickness and shape of the suction lead 135, and the refrigeration adhering between the suction lead 135 and the suction lead seat surface 145 provided on the valve plate 133. The adhesion force (b) due to the viscosity of the machine oil 105 is affected by the area / width of the suction lead sheet surface 145 and the viscosity of the refrigerating machine oil 105.

  In the present invention, the seating surface 138 of the valve plate 133 on which the head portion 139 of the suction lead 135 is seated is provided with a recess 141 that surrounds the entire circumference or part of the suction hole 131, and the recess 141 and the head portion 139 are not seated. By providing the extending groove 143 that communicates with the seating surface 142, the head portion 139 of the suction lead 135 seals the suction hole 131 formed in the valve plate 133 during the compression stroke, and the suction lead 135. The head portion 139 seals the concave portion 141 provided in the valve plate 133 and accumulates the high-pressure refrigerant 103 in the concave portion 141 through the extending groove 143.

  Next, during the intake stroke, the high-pressure refrigerant 103 accumulated in the recess 141 immediately expands as the pressure in the compression chamber 137 decreases. Due to this expansion force (E), the head portion 139 of the suction lead 135 is pushed open from the seating surface 138 of the valve plate 133 in which the suction hole 131 is formed, and the suction hole 131 is quickly opened as the suction stroke starts. Opened.

  Therefore, since the suction lead 135 is opened quickly and the refrigerant 103 is sucked into the compression chamber 137 as the suction stroke starts, it is possible to provide a hermetic compressor with low suction loss and high refrigeration capacity and efficiency. it can.

  In addition, the ratio of the projected area of the recess 141 to the projected area of the suction hole 131 is in the range of 1% to 5%, and the minimum high pressure pressure is set so that the suction lead 135 is quickly opened with the start of the suction stroke. In order to reduce the re-expansion loss due to the high-pressure refrigerant 103 accumulated in the recess 141, the charging amount of the refrigerant 103 into the compression chamber 137 is further improved, and high refrigerating capacity is achieved. As a result, the efficiency can be improved.

  In addition, a suction lead sheet surface 145 formed by the recess 141 and the suction hole 131 is provided, and the ratio of the projected area of the suction lead sheet surface 145 to the projected area of the suction hole 131 is in the range of 3% to 60%. Since the sealing performance between the suction hole 131 and the recess 141 can be secured and the viscous resistance of the refrigerating machine oil 105 adhering between the suction lead sheet surface 145 and the suction lead 135 can be suppressed, the suction lead sheet surface 145 Since the adhesion force between the suction lead 135 and the suction lead sheet surface 145 can be suppressed while ensuring the sealing performance at the same time, the suction lead 135 opens more quickly, and the amount of the refrigerant 103 filling the compression chamber 137 is increased. It is possible to improve and obtain a high refrigeration capacity and to improve the efficiency.

  The suction lead sheet surface 145 has an annular shape and a width in the range of 0.3 mm to 0.8 mm. The suction lead sheet surface 145 secures the sealing performance between the suction hole 131 and the recess 141, and Since the viscous resistance of the refrigerating machine oil 105 adhering to the suction lead 135 can be suppressed and the adhesion force between the suction lead 135 and the suction lead sheet surface 145 can be suppressed, the suction lead 135 is further opened. Faster, the charging amount of the refrigerant 103 into the compression chamber 137 is improved, high refrigeration capacity can be obtained, the efficiency can be improved, and the processing is easy, so the number of processing steps can be reduced and the manufacturing can be performed at low cost. be able to.

  The cross-sectional area of the extending groove 143 communicating with the non-sitting surface 142 is formed so that the cross-sectional area of the opening on the suction hole 131 side is smaller than the opening on the non-sitting surface 142 side. Sometimes, the high-pressure refrigerant 103 is easily guided to the concave portion 141 surrounding the suction hole 131 where the head portion 139 is seated via the extending groove 143, and the high-pressure pressure filled in the concave portion 141 immediately after the start of the suction stroke. The refrigerant 103 can be made difficult to leak from the extending groove 143, and the expansion force of the high-pressure refrigerant stored in the recess 141 can be sufficiently utilized. Therefore, the suction lead 135 is opened more quickly, and the compression chamber 137 is opened. The charging amount of the refrigerant 103 into the inside is improved, high refrigeration capacity is obtained, and efficiency can be improved.

  The concave portion 141 has a substantially V-shaped cross-sectional shape. By maintaining the projected area of the concave portion 141, the volume of the concave portion 141 can be reduced while ensuring the surface pressure for pushing up the suction lead 135. Therefore, in order to suppress the amount of re-expansion loss due to the refrigerant 103 accumulated in the recess 141, the amount of the refrigerant 103 filled in the compression chamber 137 can be further improved, the refrigeration capacity can be increased, and the efficiency can be improved. .

  In the present embodiment, the electric element 107 is an inverter and is operated at a frequency other than the commercial power supply frequency, and it is good if the eigenvalue of the suction lead 135 matches the rotation speed, but depending on the rotation speed, The eigenvalues of the suction lead 135 do not match, and the opening of the suction lead 135 may be significantly delayed or the opening amount may be small. However, in the present invention, the high pressure accumulated in the recess 141 at any rotational speed. Due to the expansion force of the refrigerant 103 under pressure, the suction lead 135 is quickly pushed open with the start of the suction stroke, and the suction hole 131 is opened, so that the amount of the refrigerant 103 filled in the compression chamber 137 is improved. In addition, a high refrigeration capacity can be obtained over the entire rotation speed of the inverter, and the efficiency can be improved.

  In the present embodiment, the refrigerant 103 to be used is R600a. In the case of R600a, the suction pressure is lower than that of other refrigerants 103 such as R134a, so that it is difficult to obtain a pressure difference. Although it took time to open, in the present invention, due to the expansion force of the high-pressure refrigerant 103 accumulated in the recess 141, the suction lead 135 is quickly pushed open with the start of the suction stroke, and the suction hole 131. Therefore, even in the refrigerant 103 having a low low pressure, such as R600a, the amount of the refrigerant 103 filled in the compression chamber 137 can be improved, so that a high refrigerating capacity can be obtained and the efficiency can be improved. it can.

  As described above, in the hermetic compressor according to the present invention, the suction lead includes the head portion that opens and closes the suction hole, and the seating surface of the valve plate on which the head portion is seated surrounds the entire circumference or part of the suction hole. It is provided with a recess and an extension groove that communicates the recess and the non-sitting surface on which the head portion does not sit, and can improve refrigeration capacity and efficiency. It can be applied to all uses using refrigeration cycles such as showcases and vending machines.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Front view of valve plate in hermetic compressor of the embodiment 2 is an enlarged view of the main part of FIG. 2 showing the relative position to the suction lead. Longitudinal sectional view taken along line AA in FIG. Front view of suction lead in hermetic compressor of the embodiment Front view showing the internal structure of a conventional hermetic compressor Vertical section of a conventional hermetic compressor Fig. 7 is an enlarged cross-sectional view of the main part

Explanation of symbols

121 Cylinder block 123 Cylinder 125 Piston 131 Suction hole 133 Valve plate 135 Suction lead 138 Seating surface 139 Head portion 141 Recess 142 Non-sitting surface 143 Extension groove 145 Suction lead sheet surface

Claims (6)

  Formed by a cylinder formed in a cylinder block, a piston reciprocally inserted in the cylinder, a valve plate provided at an end of the cylinder and having a suction hole, and a leaf spring material, A suction lead provided on the cylinder side of the valve plate for opening and closing the suction hole, the suction lead having a head portion for opening and closing the suction hole, and a seating surface of the valve plate on which the head portion is seated A hermetic compressor provided with a recess surrounding the entire circumference or part of the suction hole and having an extending groove that communicates the recess with a non-sitting surface on which the head portion is not seated.   The hermetic compressor according to claim 1, wherein the ratio of the projected area of the recess to the projected area of the suction hole is in the range of 1% to 5%.   The suction lead sheet surface formed by a recess and a suction hole is provided, and the ratio of the projected area of the suction lead sheet surface to the projected area of the suction hole is in the range of 3% to 60%. Hermetic compressor.   The hermetic compressor according to any one of claims 1 to 3, wherein the suction lead sheet surface has an annular shape and a width in a range of 0.3 mm to 0.8 mm.   5. The cross-sectional area of the extending groove communicating with the non-sitting surface is formed so that the cross-sectional area of the opening on the suction hole side is smaller than the opening on the non-sitting surface side. The hermetic compressor described in 1.   The hermetic compressor according to any one of claims 1 to 5, wherein the recess has a substantially V-shaped cross-sectional shape.