JP4466316B2 - Hermetic scroll compressor - Google Patents

Description

The present invention relates to a hermetic scroll compressor used in the field of refrigeration and air conditioning.

The fixed scroll that forms the scroll wrap on the end plate and the orbiting scroll are meshed with each other, and a constant pressure is applied to the back of the orbiting scroll end plate so that the end plates of both scrolls are in close contact to form a compression chamber. Has a bearing for forming a back pressure chamber in the clearance between the orbiting scroll and supporting the Oldham ring and the crankshaft main shaft while supporting the Oldham ring and the crankshaft main shaft. Is connected to the eccentric part of the crankshaft and is compressed in the center by reducing the volume toward the center by rotating the orbiting scroll using the rotational movement by the electric motor provided in the crankshaft main shaft part. In a scroll compressor having a configuration of discharging from a discharge hole, the fixed scroll The orbiting scroll slides with a thin oil film between the lap tooth tip and the lap tooth bottom surface during operation, and the clearance setting is made with high precision machining and high precision to reduce the leakage loss of the sliding part. Although managed by assembling, depending on the setting of the gap, the orbiting scroll and the fixed scroll may come into metal contact, which may cause galling or seizure due to friction.
Japanese Patent Laid-Open No. 2-16385

In the conventional technology, high-accuracy machining for each part has been established, but when the fixed scroll and the orbiting scroll are made of different materials, the gap value is unintended due to the difference in thermal expansion coefficient. In some cases, if the gap is extremely narrow, it may be a problem in terms of durability. An object of the present invention is to provide a hermetic scroll compressor that can always ensure durability even in an abnormal state.

In the gap to be set between the orbiting scroll with each lap addendum and a lap tooth bottom which is combined of the fixed scroll in order to solve the above conventional problems, a large gap only larger the orbiting scroll of the effects of thermal expansion Even when the orbiting scroll inevitably comes into contact with the fixed scroll due to thermal expansion or pressure during abnormal operation, the tooth bottom of the orbiting scroll and the fixed scroll are always in advance. The contact surface pressure generated at the bottom portion of the orbiting scroll tooth base, which has a high thermal expansion coefficient and is inferior in material strength, is set so that the tooth tip of the orbiting scroll contacts first, and the contact of the orbiting scroll tooth tip is reduced. It is possible to prevent deterioration of durability that causes abnormal wear and seizure by increasing the surface pressure when contacted by always following the bottom of the tooth. Next, it is possible to provide a hermetic scroll compressor capable of ensuring durable than the prior art.

  The present invention can improve the durability of the orbiting scroll forming the compression chamber of the hermetic scroll compressor.

  1st invention sets the clearance gap provided in each lap tooth tip and lap tooth bottom which meshes a turning scroll and a fixed scroll by changing the height of only a turning scroll. According to this configuration, even when the orbiting scroll having a high thermal expansion coefficient is deformed first and comes into contact with the fixed scroll, the lap tooth bottom of the orbiting scroll always comes into contact with the lap tooth tip of the fixed scroll. In particular, an abnormal increase in the surface pressure at the lap tooth tip of the orbiting scroll can be avoided, and abnormal sliding, wear, galling, seizure, etc. during operation can be prevented.

  According to a second invention, in the first invention, the seal material disposed on the upper surface of the orbiting scroll lap is abolished, and the design gap between the bottom surface of the fixed scroll and the wrap tooth tip of the orbiting scroll is further reduced. According to this configuration, since the leakage loss from the gap is reduced, higher efficiency can be expected, but since the half-surface gap is minimized, the wrap tooth tip of the orbiting scroll further contacts the lap tooth bottom of the fixed scroll. However, abnormal sliding, abrasion, galling, and seizure are likely to occur, but can be prevented.

  According to a third aspect of the present invention, in the first aspect of the invention, the starting point for providing a slope that widens the gap between the wrap tooth tip and the lap tooth bottom of the orbiting scroll, that is, the fixed scroll, is the bottom of the orbiting scroll tooth bottom. The point is closer to the center side than the wrap tooth tip. According to this configuration, even when the orbiting scroll having a high thermal expansion coefficient is deformed first and comes into contact with the fixed scroll, the lap tooth bottom of the orbiting scroll always comes into contact with the lap tooth tip of the fixed scroll. In particular, an abnormal increase in the surface pressure at the lap tooth tip of the orbiting scroll can be avoided, and abnormal sliding, wear, galling, seizure, etc. during operation can be prevented.

  According to a fourth invention, in the third invention, the seal material disposed on the top surface of the orbiting scroll lap is eliminated, and the design gap between the bottom surface of the fixed scroll and the wrap tooth tip of the orbiting scroll is further reduced. According to this configuration, since the leakage loss from the gap is reduced, higher efficiency can be expected, but since the half-surface gap is minimized, the wrap tooth tip of the orbiting scroll further contacts the lap tooth bottom of the fixed scroll. However, abnormal sliding, abrasion, galling, and seizure are likely to occur, but can be prevented.

According to a fifth aspect, in the third aspect, the amount of height change between the lap tooth tip and the lap tooth bottom of the orbiting scroll, that is, an inclination that widens the gap between the fixed scroll and the tooth bottom of the orbiting scroll is the wrap tooth. It is configured to be smaller than the previous one. According to this configuration, even when the orbiting scroll having a high thermal expansion coefficient is deformed first and comes into contact with the fixed scroll, the lap tooth bottom of the orbiting scroll always comes into contact with the lap tooth tip of the fixed scroll. In particular, an abnormal increase in the surface pressure at the lap tooth tip of the orbiting scroll can be avoided, and abnormal sliding, wear, galling, seizure, etc. during operation can be prevented.

  In a sixth aspect of the present invention, the seal material disposed on the upper surface of the orbiting scroll lap is abolished in the fifth aspect of the invention, and the design gap between the bottom surface of the fixed scroll and the wrap tooth tip of the orbiting scroll is further reduced. According to this configuration, since the leakage loss from the gap is reduced, higher efficiency can be expected, but since the half-surface gap is minimized, the wrap tooth tip of the orbiting scroll further contacts the lap tooth bottom of the fixed scroll. However, abnormal sliding, abrasion, galling, and seizure are likely to occur, but can be prevented.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a hermetic scroll compressor. The refrigerant gas sucked from the suction pipe 1 passes through the suction chamber 3 of the fixed scroll 2 and is confined in the compression chamber 5 formed by meshing with the orbiting scroll 4, and is compressed and discharged while decreasing in volume toward the center. It is discharged from port 6. The fixed scroll 2 and the orbiting scroll 4 are made of different materials, and the orbiting scroll 4 is made of a material having a large coefficient of thermal expansion. Lubricating oil is sucked up from the lower part of the compressor by a trochoid pump 7 which is given rotational motion by the crankshaft 8, and is guided to the inner space 10 of the orbiting scroll through the lubricating oil supply hole 9 in the crankshaft 8. . From here, the oil flow path is divided into two directions, and one side passes through a throttle portion 11 provided on the back of the end plate of the orbiting scroll 4 to a back pressure chamber 13 formed by being surrounded by the fixed scroll 2 and the bearing 12. Led. The back pressure chamber 13 has an intermediate pressure of high and low pressure, and the back pressure adjusting mechanism 14 controls the intermediate pressure to be a constant pressure. The back pressure adjusting mechanism 14 is provided with a valve 16 in a passage 15 communicating from the back pressure chamber 13 to the suction chamber 3 through the inside of the fixed scroll 2, and the pressure in the back pressure chamber 13 is set pressure. When the pressure is higher, the valve 16 is opened and the oil in the back pressure chamber 13 is supplied to the suction chamber 3 to maintain the back pressure chamber at a constant intermediate pressure. Further, the oil supplied to the suction chamber 3 moves to the compression chamber 5 along with the swiveling motion, and serves to prevent leakage between the compression chambers. FIG. 2 is a diagram in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in a radial direction from the center of the wrap. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

(Embodiment 2)
Since the seal material 18 is not provided at the tooth tip of the wrap 17 of the orbiting scroll 4, the lap tooth tip gap of the orbiting scroll is set to be smaller than the gap of the first embodiment. As a result, the leakage loss is reduced as compared with the case where the seal material 18 is used, but the lap tooth tip is more likely to come into contact with the fixed scroll 2 during the operation. FIG. 3 is a diagram in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in a radial direction from the center of the wrap. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

(Embodiment 3)
FIG. 4 shows a plan view in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in the radial direction from the center of the wrap. In this way, the height change start point is set at a place where the lap tooth bottom 19 is closer to the center than the lap tooth tip 20. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

(Embodiment 4)
Since the seal material 18 is not provided at the tooth tip of the wrap 17 of the orbiting scroll 4, the lap tooth tip gap of the orbiting scroll is set to be smaller than the gap of the first embodiment. As a result, the leakage loss is reduced as compared with the case where the seal material 18 is used, but the lap tooth tip is more likely to come into contact with the fixed scroll 2 during the operation. FIG. 5 shows a plan view in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in the radial direction from the center of the wrap to the height of the lap tooth tip and the tooth bottom of the orbiting scroll 4. The height change start point is set at a place where the lap tooth bottom 19 is closer to the center than the lap tooth tip 20. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

(Embodiment 5)
FIG. 6 is a diagram in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in the radial direction from the center of the wrap. As described above, the height change amount and the lap tooth bottom inclination amount 21 are set to be smaller than the lap tooth tip inclination amount 22. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

(Embodiment 6)
Since the seal material 18 is not provided at the tooth tip of the wrap 17 of the orbiting scroll 4, the lap tooth tip gap of the orbiting scroll is set to be smaller than the gap of the first embodiment. As a result, the leakage loss is reduced as compared with the case where the seal material 18 is used, but the lap tooth tip is more likely to come into contact with the fixed scroll 2 during the operation. FIG. 7 is a plan view in which the heights of the wrap tooth tip and the tooth bottom of the orbiting scroll 4 are developed in a radial direction from the center of the wrap to the height of the lap tooth tip and the tooth bottom of the orbiting scroll 4. As described above, the height change amount and the lap tooth bottom inclination amount 21 are set to be smaller than the lap tooth tip inclination amount 22. By setting it as such a design dimension, even when the central part approaches the fixed scroll 2 due to the influence of thermal expansion or pressure, the lap tooth bottom can always be set to contact the fixed scroll 2 first. Sliding wear, galling, and seizure of the orbiting scroll 4 can be prevented.

  As described above, the hermetic scroll compressor according to the present invention is a compressor in the case where the fixed scroll and the orbiting scroll are made of different materials, and particularly the thermal expansion coefficient of the orbiting scroll is large and the material strength is inferior. In addition, it is possible to provide a compressor that does not impair the durability of the orbiting scroll.

Sectional drawing of the hermetic scroll compressor which shows the Example of this invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention Schematic developed in the radial direction of the orbiting scroll wrap height showing another embodiment of the present invention

DESCRIPTION OF SYMBOLS 1 Suction pipe 2 Fixed scroll 3 Suction chamber 4 Orbiting scroll 5 Compression chamber 6 Discharge port 7 Trochoid pump 8 Crankshaft 9 Internal hole 10 Eccentric bearing internal space 11 Throttle part 12 Bearing 13 Back pressure chamber 14 Back pressure adjustment mechanism 15 Passage 16 Valve 17 Lap 18 Sealing material 19 Lap tooth bottom change start point 20 Lap tooth tip change start point 21 Lap tooth bottom inclination amount 22 Lap tooth tip inclination amount

Claims (6)

A first scroll member comprising a first scroll plate and an involute curve standing upright or a first scroll wrap having a curved shape similar to the first scroll plate and an involute curve standing upright A second scroll member made of a second scroll wrap having a curved shape similar to that of the first scroll member substantially matches the upright direction of each scroll wrap, and faces and engages the scroll wraps. The second scroll member viewed from the side performs a turning motion about an axis substantially parallel to the upright direction of each scroll wrap without rotation about an axis substantially parallel to the upright direction of each lap. In the scroll compressor, a part of the first orbiting scroll member or a part thereof. The first end plate surface that defines the distance between the scroll members in the lap upright direction during operation with a member that moves together with the first end plate surface and a part of the second fixed scroll member or a member that moves integrally with the first end plate surface in the lap upright direction during operation. A second end plate surface that defines the distance between the scroll members is provided, and the tooth bottom of the orbiting scroll wrap and the teeth of the fixed scroll wrap when the distance between both scroll members is defined by the first and second end plate surfaces during assembly. In the case where a clearance is provided between the tip of the orbiting scroll wrap and a tooth bottom of the fixed scroll wrap, and a clearance between the tip of the fixed scroll wrap and the bottom of the fixed scroll wrap, bottom is formed so as to approach gradually the fixed scroll side from the center to the radially outside of the spiral, the pivoting scan during operation Hermetic scroll compressor, wherein a tooth tip of the tooth bottom and the fixed scroll of the rolls was set to contact before the tooth bottom of the fixed scroll and the addendum of the orbiting scroll. Since the sealing material originally provided on the upper surface of the orbiting scroll lap is omitted by making the gap between the wrap tooth tip of the orbiting scroll and the lap tooth bottom of the fixed scroll minute, the influence of thermal expansion strain generated in the orbiting scroll The hermetic scroll compressor according to claim 1, wherein By providing the lap tooth tip and the root height change starting point provided in the orbiting scroll at a position where the lap tooth root is closer to the center than the lap tooth tip, the tooth bottom of the orbiting scroll and the tooth tip of the fixed scroll are provided during operation. 2. The hermetic scroll compressor according to claim 1, wherein the hermetic scroll compressor is set to come into contact with the tooth tip of the orbiting scroll and the tooth bottom of the fixed scroll. Since the sealing material originally provided on the upper surface of the orbiting scroll lap is omitted by making the gap between the wrap tooth tip of the orbiting scroll and the lap tooth bottom of the fixed scroll minute, the influence of thermal expansion strain generated in the orbiting scroll The hermetic scroll compressor according to claim 3, wherein becomes larger. The amount of change in the height of the wrap tooth tip and the tooth bottom provided in the orbiting scroll is set so that the lap tooth root is shallower than the lap tooth tip, and the tooth bottom of the orbiting scroll and the tooth tip of the fixed scroll are set to 4. The hermetic scroll compressor according to claim 3, wherein the hermetic scroll compressor is set so as to come into contact with the tooth tip and the tooth bottom of the fixed scroll. Since the sealing material originally provided on the upper surface of the orbiting scroll lap is omitted by making the gap between the wrap tooth tip of the orbiting scroll and the lap tooth bottom of the fixed scroll minute, the influence of thermal expansion strain generated in the orbiting scroll The hermetic scroll compressor according to claim 5, wherein becomes larger.

Images