JP2009002224A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor preventing seizure by inhibiting deformation of a fixed scroll due to thermal expansion and securing high reliability. <P>SOLUTION: Heat insulating material is installed at an anti-lap side of an end plate of the fixed scroll 2, heat conduction to a fixed scroll end plate from high temperature working fluid is inhibited to inhibit temperature rise of the fixed scroll 2 even during high speed-high differential pressure operation in which delivery temperature gets high, and deformation due to thermal expansion of the fixed scroll end plate and the fixed scroll lap is inhibited to prevent contact of a turning scroll 3 and the fixed scroll 2. Consequently, increase of input and seizure can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor used in a cooling device such as a cooling / heating air conditioner or a refrigerator, or a heat pump type hot water supply device.

The structure of patent document 1 is known for this kind of conventional scroll compressor. FIG. 4 is a cross-sectional view showing a conventional scroll compressor described in Patent Document 1. As shown in FIG. In FIG. 4, a fixed scroll 2 having a spiral wall body standing on one side surface of the end plate 2b and fixed in a fixed position, and a spiral-shaped other body standing on one side surface of another end plate 3a. It is comprised from the turning scroll 3 supported so that revolving turning motion was possible, engaging each said wall body and preventing rotation. The fixed scroll 2 has a discharge port 2d, and the working fluid is discharged out of the compressor through the discharge pipe 2e.
JP 2006-266170 A

  However, the discharge temperature becomes very high during high speed and high differential pressure operation, and the temperature of the working fluid in the discharge pipe also becomes high, so heat conduction from the high temperature working fluid to the fixed scroll end plate causes the fixed scroll temperature to rise. With the rise, the fixed scroll end plate and the fixed scroll wrap are deformed due to thermal expansion, and the orbiting scroll and the fixed scroll come into contact with each other, resulting in an increase in input and seizure.

  If the fixed scroll and the orbiting scroll are set to have a wide axial gap in consideration of the thermal expansion of the fixed scroll wrap, leakage from this gap will increase during low-speed and low differential pressure operation, resulting in reduced compressor performance. was there.

  An object of the present invention is to solve the conventional problems described above, and to provide a scroll compressor that suppresses deformation due to thermal expansion of a fixed scroll and has high reliability and high performance regardless of operating conditions.

  In order to solve the conventional problem, the scroll compressor according to the present invention is provided with a heat insulating material on the opposite side of the end plate of the fixed scroll.

  As a result, even during high speed and high differential pressure operation where the discharge temperature is high, heat conduction from the high temperature working fluid to the fixed scroll end plate is suppressed, and the temperature rise of the fixed scroll is suppressed. Since the deformation due to the thermal expansion is suppressed and the contact between the orbiting scroll and the fixed scroll can be prevented, an increase in input and seizure can be prevented.

  The scroll compressor of this invention can suppress the deformation | transformation by the thermal expansion of a fixed scroll, and can improve the reliability and performance of a scroll compressor.

The first invention provides heat conduction from the high temperature working fluid to the fixed scroll end plate even during high-speed and high differential pressure operation where the discharge temperature becomes high by providing a heat insulating material on the opposite side of the end plate of the fixed scroll end plate. This suppresses the temperature rise of the fixed scroll, suppresses deformation due to thermal expansion of the fixed scroll end plate and the fixed scroll wrap, and prevents contact between the orbiting scroll and the fixed scroll, thereby preventing an increase in input and seizure.

  According to the second aspect of the present invention, since the heat conduction from the discharge port to the fixed scroll wrap can be suppressed by installing a heat insulating material in the discharge port, deformation due to thermal expansion of the fixed scroll end plate and the fixed scroll wrap can be further suppressed.

  In the third aspect of the invention, the heat insulating material is a paint containing a hollow ceramic, so that the heat insulating effect is enhanced, and it can be easily applied to parts having a complicated shape, and the heat conduction from the discharge port to the fixed scroll wrap is suppressed. Therefore, deformation due to thermal expansion of the fixed scroll end plate and the fixed scroll wrap can be further suppressed.

  According to the fourth aspect of the present invention, since the heat in the muffler can be effectively radiated to the outside of the muffler by installing the radiation fins on the muffler, the deformation due to the thermal expansion of the fixed scroll end plate and the fixed scroll wrap is further suppressed. it can.

  In the fifth invention, since the muffler is made of an aluminum alloy, the heat in the muffler can be dissipated more effectively outside the muffler. Therefore, deformation due to thermal expansion of the fixed scroll end plate and the fixed scroll wrap is prevented. Further suppression is possible.

  According to a sixth aspect of the present invention, even when the working fluid of the compressor is carbon dioxide having a large differential pressure during operation, the high-temperature working fluid is moved from the high-temperature working fluid to the fixed scroll end plate during high-speed and high differential pressure operation where the discharge temperature is high. The heat transfer of the fixed scroll is suppressed, the temperature rise of the fixed scroll is suppressed, the deformation due to the thermal expansion of the fixed scroll end plate and the fixed scroll wrap is suppressed, and the contact between the orbiting scroll and the fixed scroll can be prevented. Can be prevented.

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

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to the first embodiment of the present invention. The operation and action of the scroll compressor configured as shown in FIG. 1 will be described below.

  As shown in FIG. 1, the scroll compressor of the present invention includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in an airtight container 1, and a fixed bolted on the main bearing member 11. A scroll-type compression mechanism 2f is configured by sandwiching a revolving scroll 3 meshing with the fixed scroll 2 between the scroll 2 and the revolving scroll 3 between the revolving scroll 3 and the main bearing member 11 is prevented from rotating. A rotation restricting mechanism 14 such as an Oldham ring that guides the orbital movement is provided, and the orbiting scroll 3 is eccentrically driven by the eccentric shaft portion 4a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 3 to move in a circular orbit. By using this, the compression chamber 15 formed between the fixed scroll 2 and the orbiting scroll 3 becomes smaller while moving from the outer peripheral side to the center portion. The working fluid gas is sucked and compressed from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 2, and the working fluid gas exceeding the predetermined pressure is compressed at the center of the fixed scroll 2. The discharge valve 19 is pushed open from the discharge port 2d and discharged into the muffler 21 repeatedly.

A sliding partition ring 78 disposed on the main bearing member 11 is provided on the back surface portion of the orbiting scroll 3, and the high-pressure portion that is an inner region of the sliding partition ring 78 is formed by the sliding partition ring 78 while performing the orbiting motion. And a back pressure space set to an intermediate pressure between the high pressure and the low pressure, which is the outer region. By applying the pressure on the back surface, the orbiting scroll 3 is stably pressed against the fixed scroll 2 to reduce leakage and stably perform circular orbit movement.

  Further, the fixed scroll 2 includes a back pressure adjusting valve 9 that controls the pressure in the back pressure space 29 on the back surface of the orbiting scroll 3.

  The working fluid discharged into the muffler 21 passes through the discharge flow path A22, passes through the rotor through hole 23, is reversed, passes through the discharge flow path B27 from the stator through hole 24, enters the mechanical upper space 25, and is discharged. It is discharged out of the compressor from the pipe 2e.

  During high-speed and high differential pressure operation, the working fluid temperature is highest in the muffler 21, the fixed scroll 2 is heated in the muffler 21, and the fixed scroll 2 and the main bearing member 11 are heated in the discharge flow path A22. The heat conduction from the high temperature working fluid in the muffler 21 to the fixed scroll 2 occurs, and as the temperature of the fixed scroll 2 rises, the end plate of the fixed scroll 2 and the wrap portion of the fixed scroll 2 are deformed by thermal expansion. In some cases, the orbiting scroll 3 and the fixed scroll 2 are in contact with each other, resulting in an increase in input or seizure.

  In addition, if the wide gap in the axial direction between the fixed scroll 2 and the orbiting scroll 3 is set in consideration of the thermal expansion of the lap of the fixed scroll 2, leakage from this gap increases during low speed / low differential pressure operation, and the performance of the compressor May be reduced.

  By installing the heat insulating material 26 on the surface of the fixed scroll 2 in contact with the muffler 21, heat conduction from the high temperature working fluid in the muffler 21 to the fixed scroll 2 is suppressed, and the fixed scroll 2 accompanying the temperature rise of the fixed scroll 2. The deformation due to the thermal expansion of the end plate and the wrap portion of the fixed scroll 2 can be suppressed.

  In addition, if the coating material containing the hollow ceramic with a high heat insulation effect is used, since it can apply to the fixed scroll 2, a heat insulating material can be installed easily.

  Further, the discharge flow path A may be insulated.

(Embodiment 2)
FIG. 2 is a longitudinal sectional view of a compression mechanism portion of the scroll compressor according to the second embodiment of the present invention.

  In the second embodiment, a particularly characteristic configuration is that a heat insulating material is provided in the discharge port 2d.

  The operation of the scroll compressor in the second embodiment is the same as that in the first embodiment, and the description of the basic operation is omitted.

  When the working fluid is carbon dioxide, since the pressure during operation is large, the rigidity of the fixed scroll 2 must be ensured in order to suppress deformation of the fixed scroll 2 due to the differential pressure. Therefore, the fixed scroll 2 becomes thicker in the axial direction, the discharge port 2d becomes longer in the axial direction, and the area for receiving heat becomes larger.

  By installing a heat insulating material on the inner surface of the discharge port 2d through which the high-temperature working fluid immediately after discharge passes, heat conduction from the high-temperature working fluid in the discharge port 2d to the fixed scroll 2 is suppressed, and the fixed scroll 2 It is possible to suppress deformation due to thermal expansion of the end plate of the fixed scroll 2 and the lap portion of the fixed scroll 2 due to the temperature rise.

  In addition, if the coating material containing the hollow ceramic with a high heat insulation effect is used, since it can apply to the fixed scroll 2, a heat insulating material can be installed easily.

(Embodiment 3)
FIG. 3 is a longitudinal sectional view of a compression mechanism portion of a scroll compressor according to the third embodiment of the present invention.

  In the present embodiment, a particularly characteristic configuration is that the muffler 21 is provided with radiating fins 28.

  The operation of the scroll compressor in the third embodiment is the same as that in the first embodiment, and the description of the basic operation is omitted.

  During high-speed and high differential pressure operation, the working fluid temperature is highest in the muffler 21, the fixed scroll 2 is heated in the muffler 21, and the fixed scroll 2 and the main bearing member 11 are heated in the discharge flow path A22. The heat conduction from the high temperature working fluid in the muffler 21 to the fixed scroll 2 occurs, and as the temperature of the fixed scroll 2 rises, the end plate of the fixed scroll 2 and the wrap portion of the fixed scroll 2 are deformed by thermal expansion. In some cases, the orbiting scroll 3 and the fixed scroll 2 are in contact with each other, resulting in an increase in input or seizure.

  In addition, if the wide gap in the axial direction between the fixed scroll 2 and the orbiting scroll 3 is set in consideration of the thermal expansion of the lap of the fixed scroll 2, leakage from this gap increases during low speed / low differential pressure operation, and the performance of the compressor May be reduced.

  By installing heat radiating fins on the muffler 21, the heat in the muffler 21 is radiated to the mechanical upper space 25, thereby preventing the working fluid temperature in the muffler 21 from rising and fixing from the high temperature working fluid in the muffler 21. Heat conduction to the scroll 2 can be suppressed, and deformation due to thermal expansion of the end plate of the fixed scroll 2 and the wrap portion of the fixed scroll 2 can be suppressed as the temperature of the fixed scroll 2 increases.

  Furthermore, if the material of the muffler 21 is an aluminum alloy having high thermal conductivity, the heat in the muffler 21 can be radiated more effectively to the mechanical upper space 25.

  As described above, the scroll compressor according to the present invention can suppress deformation due to thermal expansion of the fixed scroll, and is not limited to the working fluid as the working fluid, and the air scroll compressor, the vacuum pump, and the scroll type expander. It can also be applied to the use of scroll fluid machines such as.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention The longitudinal cross-sectional view of the scroll compressor in Embodiment 2 of this invention The longitudinal cross-sectional view of the scroll compressor in Embodiment 3 of this invention Sectional view of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Fixed scroll 2b Fixed scroll end plate 2d Discharge port 2e Discharge pipe 2f Scroll compression mechanism part 3 Orbiting scroll 3a Orbiting scroll end plate 4 Crankshaft 4a Eccentric part 9 Back pressure adjustment valve 11 Main bearing member 14 Rotation restriction mechanism 15 Compression chamber 16 Suction Pipe 17 Suction Port 19 Discharge Valve 21 Muffler 22 Suction Channel A
23 Rotor through hole 24 Stator through hole 25 Mechanical upper space 26 Heat insulating material 27 Discharge flow path B
28 Radiation fin 29 Back pressure space 30 High pressure part 78 Sliding partition ring

Claims (6)

By meshing the fixed scroll and the orbiting scroll where the spiral wrap rises from the end plate provided with the discharge port, and moving the orbiting scroll along the circular orbit under the restriction of rotation, it moves while changing the volume. , Forming a compression chamber, the working fluid sucked from the suction port is compressed in the compression chamber, passes through the muffler adjacent to the opposite side of the fixed scroll from the discharge port, and then discharges to the outside of the compressor A scroll compressor having a flow path to be provided, wherein a heat insulating material is provided on a side opposite to the end of the fixed scroll end plate. The scroll compressor according to claim 1, wherein a heat insulating material is provided in the discharge port. The scroll compressor of Claim 1 or Claim 2 which comprised the heat insulating material with the hollow ceramic particle | grains. The scroll compressor according to any one of claims 1 to 3, wherein the muffler is provided with heat radiation fins. The scroll compressor according to claim 4, wherein the muffler is made of an aluminum alloy. The scroll compressor according to any one of claims 1 to 5, wherein the working fluid is carbon dioxide.

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