JP5040111B2 - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor capable of improving compression efficiency by securing sealing performance between a cylinder and an end plate member and inhibiting leak of refrigerant gas from a cylinder chamber. <P>SOLUTION: A first cylinder 121 and an upper side end plate member are fastened by bolts 8. A hole part 81 is provided between the adjacent bolts 8, 8 on a contact surface 121a of the first cylinder 121 with the upper side end plate member. The seal area on which the first cylinder 121 and the upper side end plate between the adjacent bolts 8, 8 are thereby reduced, and seal contact pressure is increased. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator.

  2. Description of the Related Art Conventionally, there is a compressor provided with a compression element having a cylinder and an end plate member attached to the opening end of the cylinder (see JP-A-9-88856: Patent Document 1).

The cylinder and the end plate member are fastened to each other via a plurality of bolts. A cylinder chamber for compressing the refrigerant gas is formed by the cylinder and the end plate member.
Japanese Patent Laid-Open No. 9-88856

  However, in the conventional compressor, of the contact surfaces of the cylinder and the end plate member, a portion in the vicinity of the bolt has a high surface pressure and is sufficiently sealed, but between the adjacent bolts. In this part, the surface pressure decreased due to the elastic deformation of the cylinder and the end plate member, and the seal was insufficient. Therefore, the refrigerant gas leaks from the cylinder chamber at an insufficiently sealed portion, or conversely, the high-pressure gas in the container flows into the cylinder chamber and the compressed gas is overheated, resulting in a reduction in compression efficiency. There was a problem to do.

  Then, the subject of this invention is ensuring the sealing performance between a cylinder and an end plate member, suppressing overheating by leakage of refrigerant gas from a cylinder room, or inflow of high pressure gas in a container into a cylinder room, The object is to provide a compressor capable of improving the compression efficiency.

In order to solve the above-described problems, a compressor according to the present invention includes a cylinder and an end plate member that is fastened to the opening end of the cylinder via a plurality of bolts and forms a cylinder chamber that compresses the refrigerant gas together with the cylinder. Prepared,
The plurality of bolts are arranged in the circumferential direction around the central axis of the cylinder chamber,
A hole for increasing the surface pressure between the contact surface of the cylinder and the contact surface of the end plate member is provided between the bolts adjacent in the circumferential direction on the contact surface of the cylinder with respect to the end plate member;
The bolt and the hole are arranged around the cylinder chamber around the central axis of the cylinder chamber,
The hole is formed to penetrate the cylinder ,
The hole is characterized in that it exists on an arc line connecting the centers of the bolts adjacent in the circumferential direction in an arc shape with the central axis of the cylinder chamber as the center .

  According to the compressor of the present invention, the contact surface of the cylinder and the end plate member are arranged between the adjacent bolts on at least one of the contact surface of the cylinder or the contact surface of the end plate member. Since the hole part which raises the surface pressure with the said contact surface is provided, the sealing performance of the said contact surface of the said cylinder between the said adjacent bolts and the said contact surface of the said end plate member is securable. Therefore, it is possible to suppress overheating due to leakage of refrigerant gas from the cylinder chamber and inflow of high-pressure gas in the container into the cylinder chamber, and compression efficiency can be improved.

  Moreover, in the compressor of one Embodiment, the said hole part is machined and formed.

  According to the compressor of this embodiment, since the hole can be machined simultaneously with the bolt hole for passing the bolt, the hole can be formed at low cost.

  Moreover, in the compressor of one Embodiment, the said hole is shape | molded and formed by sintering.

  According to the compressor of this embodiment, since the hole is formed by molding by sintering, processing cost is not required, and the material cost of the end plate member can be reduced.

  Moreover, in the compressor of one Embodiment, the said hole is shape | molded and formed by casting.

  According to the compressor of this embodiment, since the hole is formed by casting, the processing cost becomes unnecessary, and the material cost of the end plate member can be reduced.

  According to the compressor of the present invention, the contact surface of the cylinder and the end plate member are in contact between the adjacent bolts on at least one of the contact surface of the cylinder or the contact surface of the end plate member. Since the hole for increasing the surface pressure with the surface is provided, the sealing performance between the cylinder and the end plate member is ensured, the leakage of the refrigerant gas from the cylinder chamber and the cylinder of the high-pressure gas in the container Compression efficiency can be improved by suppressing overheating due to inflow into the chamber.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a longitudinal sectional view showing an embodiment of the compressor of the present invention. The compressor includes an airtight container 1, a compression element 2 disposed in the airtight container 1, and a motor 3 disposed in the airtight container 1 and driving the compression element 2 via the shaft 12. I have. This compressor is a so-called high-pressure dome type rotary compressor, and the compressor element 2 is disposed below and the motor 3 is disposed above in the sealed container 1.

  The motor 3 includes a rotor 6 and a stator 5 disposed on the outer side in the radial direction of the rotor 6 via an air gap. The shaft 12 is attached to the rotor 6.

  The rotor 6 includes, for example, a rotor body made of laminated electromagnetic steel plates and a magnet embedded in the rotor body. The stator 5 includes a stator body made of, for example, iron and a coil wound around the stator body.

  The motor 3 rotates the rotor 6 together with the shaft 12 by the electromagnetic force generated in the stator 5 by passing an electric current through the coil, and drives the compression element 2 via the shaft 12.

  A suction pipe 11 for sucking refrigerant gas is attached to the sealed container 1, and an accumulator 10 is connected to the suction pipe 11. That is, the compression element 2 sucks the refrigerant gas from the accumulator 10 through the suction pipe 11.

  The refrigerant gas is obtained by controlling a condenser, an expansion mechanism, and an evaporator (not shown) that constitute an air conditioner as an example of a refrigeration system together with the compressor.

  The compressor discharges compressed high-temperature and high-pressure discharge gas from the compression element 2 and fills the inside of the hermetic container 1, and passes through a gap between the stator 5 and the rotor 6 of the motor 3. After the motor 3 is cooled, it is discharged from the discharge pipe 13 to the outside. Lubricating oil 9 is stored in the lower portion of the high-pressure region in the sealed container 1.

  The compression element 2 includes an upper end plate member 50, a first cylinder 121, an intermediate end plate member 70, and a second cylinder 221 in order from top to bottom along the rotation axis of the shaft 12. And a lower end plate member 60.

  The upper end plate member 50 and the intermediate end plate member 70 are attached to upper and lower open ends of the first cylinder 121, respectively. The intermediate end plate member 70 and the lower end plate member 60 are attached to the upper and lower open ends of the second cylinder 221, respectively.

  A first cylinder chamber 122 is formed by the first cylinder 121, the upper end plate member 50, and the intermediate end plate member 70. The second cylinder chamber 222 is formed by the second cylinder 221, the lower end plate member 60, and the intermediate end plate member 70.

  The upper end plate member 50 includes a disk-shaped main body 51 and a boss 52 provided upward in the center of the main body 51. The main body 51 and the boss 52 are inserted through the shaft 12. The main body 51 is provided with a discharge port 51 a that communicates with the first cylinder chamber 122.

  A discharge valve 131 is attached to the main body 51 so as to be located on the opposite side of the main body 51 from the first cylinder 121. The discharge valve 131 is a reed valve, for example, and opens and closes the discharge port 51a.

  A cup-shaped first muffler cover 340 is attached to the main body 51 so as to cover the discharge valve 131 on the side opposite to the first cylinder 121. The first muffler cover 340 is fixed to the main body 51 with bolts 8. The first muffler cover 340 is inserted through the boss portion 52.

  A first muffler chamber 342 is formed by the first muffler cover 340 and the upper end plate member 50. The first muffler chamber 342 and the first cylinder chamber 122 are communicated with each other through the discharge port 51a.

  The lower end plate member 60 includes a disc-shaped main body portion 61 and a boss portion 62 provided downward in the center of the main body portion 61. The main body 61 and the boss 62 are inserted through the shaft 12. The main body 61 is provided with a discharge port (not shown) that communicates with the second cylinder chamber 222.

  A discharge valve (not shown) is attached to the main body 61 so as to be located on the opposite side of the main body 61 from the second cylinder 221, and the discharge valve opens and closes the discharge port.

  A second muffler cover 240 is attached to the main body 61 so as to cover the discharge valve on the side opposite to the second cylinder 221. The second muffler cover 240 is fixed to the main body 61 with bolts 8. The second muffler cover 240 is inserted through the boss portion 62.

  A second muffler chamber 242 is formed by the second muffler cover 240 and the lower end plate member 60. The second muffler chamber 242 and the second cylinder chamber 222 are communicated with each other through the discharge port.

  The second muffler chamber 242 and the first muffler chamber 342 include the lower end plate member 60, the second cylinder 221, the intermediate end plate member 70, the first cylinder 121, and the upper side. The end plate member 50 is inserted through a hole (not shown).

  The first muffler chamber 342 and the outside of the first muffler cover 340 are communicated with each other through a hole (not shown) formed in the first muffler cover 340.

  The end plate members 50, 60, 70, the cylinders 121, 221, and the muffler covers 240, 340 are integrally tightened and fixed by a plurality of bolts 8. The upper end plate member 50 of the compression element 2 is attached to the sealed container 1 by welding or the like.

  One end of the shaft 12 is supported by the upper end plate member 50 and the lower end plate member 60. That is, the shaft 12 is cantilevered. One end portion (support end side) of the shaft 12 enters the inside of the first cylinder chamber 122 and the second cylinder chamber 222.

  The shaft 12 is provided with a first eccentric pin 126 so as to be positioned in the first cylinder chamber 122. The first eccentric pin 126 is fitted to the first roller 127. The first roller 127 is disposed in the first cylinder chamber 122 so as to be capable of revolving the central axis of the first cylinder chamber 122, and performs a compression action by the revolving motion of the first roller 127. I have to.

  The shaft 12 is provided with a second eccentric pin 226 so as to be positioned in the second cylinder chamber 222. The second eccentric pin 226 is fitted to the second roller 227. The second roller 227 is disposed in the second cylinder chamber 222 so as to be able to revolve the central axis of the second cylinder chamber 222, and performs a compression action by the revolving motion of the second roller 227. I have to.

  The first eccentric pin 126 and the second eccentric pin 226 are at a position shifted by 180 ° with respect to the rotation axis of the shaft 12.

  Next, the compression action of the first cylinder chamber 122 will be described.

  As shown in FIG. 2, the inside of the first cylinder chamber 122 is partitioned by a blade 128 provided integrally with the first roller 127. That is, in the chamber on the right side of the blade 128, one of the suction pipes 11 opens on the inner surface of the first cylinder chamber 122 to form a refrigerant gas suction chamber (low pressure chamber) 123. On the other hand, in the chamber on the left side of the blade 128, the discharge port 51a (shown in FIG. 1) opens to the inner surface of the first cylinder chamber 122 to form a refrigerant gas discharge chamber (high pressure chamber) 124. Yes.

  Semi-cylindrical bushes 125, 125 are in close contact with both surfaces of the blade 128 for sealing. The bushes 125 and 125 are held by the first cylinder 121. That is, the blade 128 is supported by the first cylinder 121. Lubrication is performed between the blade 128 and the bushes 125 and 125, and between the bush 125 and the first cylinder 121.

  Then, the first eccentric pin 126 rotates eccentrically with the shaft 12, and the first roller 127 fitted to the first eccentric pin 126 moves the outer peripheral surface of the first roller 127. Revolving in contact with the inner peripheral surface of the first cylinder chamber 122.

  As the first roller 127 revolves in the first cylinder chamber 122, the blade 128 advances and retreats with both side surfaces of the blade 128 held by the bushes 125, 125. Then, a low-pressure refrigerant gas is sucked into the suction chamber 123 from the suction pipe 11 and compressed to a high pressure in the discharge chamber 124, and then the high-pressure refrigerant gas is discharged from the discharge port 51a (shown in FIG. 1). Discharge.

  Thereafter, as shown in FIG. 1, the refrigerant gas discharged from the discharge port 51 a is discharged to the outside of the first muffler cover 340 via the first muffler chamber 342.

  On the other hand, the compression action of the second cylinder chamber 222 is the same as the compression action of the first cylinder chamber 122. In other words, low-pressure refrigerant gas is sucked into the second cylinder chamber 222 from the other suction pipe 11, and the refrigerant gas is compressed by the revolving motion of the second roller 227 in the second cylinder chamber 222. The high-pressure refrigerant gas is discharged outside the first muffler cover 340 via the second muffler chamber 242 and the first muffler chamber 342.

  The compression action of the first cylinder chamber 122 and the compression action of the second cylinder chamber 222 are in a phase shifted by 180 °.

  As shown in FIGS. 1 and 2, a hole 81 is provided between the adjacent bolts 8 on the contact surface 121 a of the first cylinder 121 with respect to the upper end plate member 50. The hole 81 increases the surface pressure between the contact surface 121 a of the first cylinder 121 and the contact surface 50 a of the upper end plate member 50 with respect to the first cylinder 121.

  In the contact surface 121 a of the first cylinder 121, a plurality of bolt holes 80 for passing the bolts 8 are arranged around the central axis 122 a of the first cylinder chamber 122. That is, the plurality of bolts 8 are arranged in the circumferential direction of the first cylinder 121.

  The hole portion 81 is provided at least one by one in the other portion of the adjacent bolts 8 except the one portion where the bush 125 is provided. That is, the hole 81 may be provided between at least one pair of the adjacent bolts 8 and 8.

  The hole 81 is formed in a penetrating shape or a concave shape. The shape of the hole 81 is formed in a perfect circle when viewed from the direction of the central axis 122 a of the first cylinder chamber 122. The hole 81 may be formed in an elliptical shape, a quadrangular shape, an arc shape, or the like.

  For example, the hole 81 may serve as a hole through which the second muffler chamber 242 and the first muffler chamber 342 communicate with each other to flow a refrigerant gas, or a hole through which the lubricating oil 9 flows. .

  The hole 81 is formed by machining. Therefore, the hole 81 can be formed at a low cost. Further, the hole 81 can be formed simultaneously with the bolt hole 80.

  In the compressor having the above-described configuration, the hole 81 is provided between the adjacent bolts 8 and 8 on the contact surface 121a of the first cylinder 121. Therefore, between the adjacent bolts 8 and 8, The seal area pressure can be increased by reducing the seal area where the contact surface 121a of the first cylinder 121 and the contact surface 50a of the upper end plate member 50 are in contact with each other.

  Therefore, the sealing performance between the contact surface 121a of the first cylinder 121 between the adjacent bolts 8 and 8 and the contact surface 50a of the upper end plate member 50 can be ensured, and the first cylinder chamber can be secured. While suppressing the leakage of the refrigerant gas from 122, the overheating due to the flow of the high-pressure gas in the sealed container 1 into the first cylinder chamber 122 can be suppressed, and the compression efficiency can be improved.

  In addition, since a gas layer is formed in the hole 81, heat transfer between the outside and the inside of the first cylinder 121 is suppressed, and the compression efficiency can be further improved.

  In addition, the hole 81 is provided between the adjacent bolts 8 and 8 on the contact surface of the second cylinder 221 with respect to the lower end plate member 60, and the above-described between the adjacent bolts 8 and 8 is provided. The sealing property between the second cylinder 221 and the lower end plate member 60 may be ensured.

  Further, the adjacent bolts on at least one of the contact surfaces of the cylinders 121, 221 with respect to the end plate members 50, 60, 70 or the contact surfaces of the end plate members 50, 60, 70 with respect to the cylinders 121, 221 What is necessary is just to provide the said hole part 81 between 8,8.

  When the hole 81 is provided on both the contact surface of the cylinders 121, 221 and the contact surface of the end plate members 50, 60, 70, the hole 81 of the cylinders 121, 221 It is preferable not to overlap with the hole 81 of the end plate members 50, 60, and 70, and the surface pressure can be increased efficiently.

  The hole 81 may be formed by molding by sintering, or may be formed by molding by casting, so that a processing step is not required and the end The amount of material of the plate members 50, 60, 70 can be reduced, and the processing cost and material cost of the end plate members 50, 60, 70 can be reduced.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the compression element 2 may be a rotary type in which a roller and a blade are separate bodies. As the compression element 2, a scroll type or a reciprocating type may be used in addition to the rotary type. The compression element 2 may be a single cylinder type having one cylinder chamber. Further, a third muffler cover communicating with the first muffler chamber 342 and the second muffler chamber 242 may be provided outside the first muffler cover 340 to form a two-stage muffler.

It is a longitudinal section showing one embodiment of the compressor of the present invention. It is a top view of the principal part of a compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing container 2 Compression element 3 Motor 5 Stator 6 Rotor 8 Bolt 11 Suction pipe 12 Shaft 50, 60, 70 End plate member 50a Contact surface 80 Bolt hole 81 Hole 121, 221 Cylinder 121a Contact surface 122, 222 Cylinder chamber

Claims (4)

Cylinders (121, 221);
An end plate member (122, 222) that forms a cylinder chamber (122, 222) that compresses the refrigerant gas together with the cylinders (121, 221) by being fastened to the open ends of the cylinders (121, 221) via a plurality of bolts (8). 50, 60, 70)
The plurality of bolts (8) are arranged in the circumferential direction around the central axis (122a) of the cylinder chamber (122, 222),
Between the bolts (8, 8) adjacent in the circumferential direction to the contact surface (121a) of the cylinder (121, 221) with respect to the end plate member (50, 60, 70), the cylinder (121, 221) A hole (81) for increasing the surface pressure between the contact surface (121a) and the contact surface (50a) of the end plate member (50, 60, 70) is provided.
The bolt (8) and the hole (81) are arranged around the cylinder chamber (122, 222) around the central axis (122a) of the cylinder chamber (122, 222),
The hole (81) is formed through the cylinder (121, 221) ,
The hole (81) exists on an arc line that connects the centers of the bolts (8, 8) adjacent in the circumferential direction in an arc shape with the center axis (122a) of the cylinder chamber (122, 222) as a center. The compressor characterized by doing. The compressor according to claim 1,
The compressor according to claim 1, wherein the hole (81) is formed by machining. The compressor according to claim 1,
The compressor, wherein the hole (81) is formed by sintering. The compressor according to claim 1,
The said hole (81) is shape | molded and formed by casting, The compressor characterized by the above-mentioned.

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