JP2009052428A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor improved in performance without largely increasing cost and adaptable to a variety of capacity ranks without largely changing the structure of the compressor. <P>SOLUTION: A slope 24 is formed on the upper surface of a scroll lap 9b at the portion affecting a compression function and a seal function toward a swirl center part. Consequently, the scroll compressor improved in performance without largely increasing cost and adaptable to a variety of capacity ranks can be provided without largely changing the structure of the compressor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scroll compressor used for an air conditioner, a refrigerator, a blower, a water heater, and the like.

  In the scroll compressor which comprises the conventional freezing apparatus, the structure of patent document 1 was known, for example. FIG. 7 is an enlarged plan view of the mechanism of the conventional scroll compressor described in Patent Document 1.

As shown in FIG. 7, a wrap forming a part of the orbiting scroll is placed on the support disk with respect to the spiral fixed scroll wrap 105b formed upright on one surface of the end plate 105a forming a part of the fixed scroll 105. And orbiting scroll wraps having a shape similar to that of the fixed scroll wrap to form a pair of spiral symmetric compression spaces between the two scrolls, and discharging to the center of the fixed scroll wrap. A discharge port that communicates with the chamber is provided, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs a revolving motion with respect to the fixed scroll via a rotation preventing member, whereby each compression space is brought into the suction side. Divided into multiple compression chambers that move continuously toward the discharge side, the volume changes to compress the fluid, and inside the compression chamber and sealed container Relief holes 101 and 102 that communicate with the discharge side are provided, and relief valves 103 and 104 that open and close the relief holes 101 and 102 due to a pressure difference between the compression chamber and the discharge side in the sealed container are provided. The relief valves 103 and 104 are opened to prevent overcompression.
JP 2000-329082 A

  Along with the diversification of capability ranks in the main body system in which the scroll compressor is used, there is a need for a scroll compressor with higher performance by sharing a variety of capability ranks in one compressor.

  However, in the conventional configuration, if the load is optimized for low load conditions due to the difference in pressure load in various capacity ranks, the performance will be significantly reduced under high load conditions. Conversely, if optimized for high load conditions, the load will be low. Under certain conditions, the performance will drop significantly. It is possible to optimize for each load condition by changing the position of the relief hole, but in order to change the position of the relief hole according to the load condition, in addition to changing the drilling program, the relief valve shape and the relief valve Changes in the assembly process will result in significant capital investment, leading to increased costs.

  The scroll compressor of the present invention solves the above-mentioned conventional problems, and by providing a slope at an optimum position according to each load condition, it is possible to improve performance without significantly increasing costs by changing only the machining program. It aims to cope with various ability ranks.

In order to solve the above-described conventional problems, the scroll compressor according to the present invention has a part of the orbiting scroll with respect to the spiral fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. A wrapping wrap stands upright on a support disk, and orbiting scroll wraps having a shape similar to the fixed scroll wrap are engaged with each other to form a pair of spiral-shaped symmetrical compression spaces between the scrolls. By providing a discharge port leading to a discharge chamber in the center of the scroll wrap, providing a suction chamber outside the fixed scroll wrap, and the orbiting scroll performs a revolving motion with respect to the fixed scroll via a rotation prevention member, Each of the compression spaces is partitioned into a plurality of compression chambers that continuously transition from the suction side toward the discharge side, and the volume changes to compress the fluid, Affecting moiety to the compression function and the sealing function of the crawl lap top toward the spiral center constituting the slope.

  The scroll compressor according to the present invention has a slope at an optimum position in accordance with each load condition, so that the scroll corresponding to various performance ranks with high performance without significantly increasing the cost by changing only the machining program. A compressor is obtained.

  In the first invention, a motor composed of a stator and a rotor and a compression mechanism driven by the motor are disposed inside the sealed container, and is formed upright on one surface of the end plate forming a part of the fixed scroll. The wrap which forms a part of the orbiting scroll stands upright on the support disk with respect to the spiral fixed scroll wrap formed, and the orbiting scroll wraps having a shape similar to the fixed scroll wrap are engaged with each other, A pair of spiral symmetric compression spaces are formed, a discharge port leading to the discharge chamber is provided at the center of the fixed scroll wrap, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll is provided via a rotation prevention member. Performs a revolving motion with respect to the fixed scroll, whereby each compression space is partitioned into a plurality of compression chambers that continuously transition from the suction side to the discharge side, and fluid is By changing the volume to shrink and forming a slope toward the center of the spiral at the part that affects the compression function and sealing function of the top surface of the scroll wrap, the original scroll wrap can be restored without greatly changing the scroll wrap shape. It is possible to reduce the volume ratio at the start of suction and the end of compression. In particular, by providing a slope at the position of the optimum volume ratio at a volume ratio where the pressure difference is small at low loads, over-compression during fluid discharge is reduced, and high performance can be achieved. Moreover, since the scroll wrap height is lowered, the bending moment applied to the scroll wrap wall surface due to the fluid pressure is reduced, the strength of the scroll wrap root portion is improved, and high reliability can be obtained. In addition, since only the machining program is changed, a scroll compressor corresponding to various performance ranks with high performance can be obtained without significantly increasing the cost.

  According to the second aspect of the present invention, since the height of the deepest part of the slope is 0.95 or less with respect to the height of the top part of the scroll wrap, the fluid can be stably supplied without being affected by the oil seal. Discharged. On the other hand, if it is 0.95 or more, the fluid discharge amount varies due to the influence of the oil seal, and the overcompression reduction amount also varies. Therefore, it is possible to minimize the variation in performance by setting it to 0.95 or less.

  According to a third aspect of the present invention, the volume ratio formed by the scroll wrap outer wall or the scroll wrap inner wall in the volume ratio inherently possessed by the scroll wrap is obtained by intersecting only one of the outer wall side and the inner wall side of the scroll wrap. Only one of the formed volume ratios can be changed, and the degree of freedom in design is increased.

  The fourth aspect of the invention has two slopes with different starting positions, and simultaneously changes the volume ratio formed by the scroll wrap outer wall and the volume ratio formed by the scroll wrap inner wall, out of the volume ratio originally possessed by the scroll wrap. It becomes possible to increase the degree of freedom of design.

The fifth invention has two slopes with different height ratios, so that in the compression chamber formed by the outer wall of the scroll wrap and the compression chamber formed by the inner wall of the scroll wrap, fluid discharge in the compression chamber on one side is optimal. When overcompression occurs in the other compression chamber, overcompression can be improved by reducing the height ratio on only one side. In addition, since the height ratio of the compression chamber that is optimal for fluid discharge can be made constant, it is possible to suppress deterioration in performance due to recompression accompanying an increase in dead volume.

  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 Embodiment 1 of the present invention.

  In FIG. 1, the entire inside of the iron sealed container 1 is a high-pressure atmosphere communicating with the discharge pipe 2, a motor 3 at the center, a compression part at the top, and a crankshaft fixed to the rotor 3 a of the motor 3. A main body frame 5 of a compression portion that supports one end of 4 is fixed to the sealed container 1, and a fixed scroll 6 is attached to the main body frame 5.

  The oil hole 7 in the main shaft direction provided in the crankshaft 4 has one end communicating with the oil supply pump device 8 and the other end finally communicating with the orbiting bearing 10 of the orbiting scroll 9. The orbiting scroll 9 that meshes with the fixed scroll 6 to form the compression space 11 includes a support disk 9a in which a spiral orbiting scroll wrap 9b and an orbiting bearing 10 are erected, and between the fixed scroll 6 and the main body frame 5. Is arranged.

  The fixed scroll 6 includes an end plate 6a and a spiral fixed scroll wrap 6b. A discharge port 12 is disposed at the center of the fixed scroll wrap 6b, and a suction chamber 13 is disposed at the outer periphery.

  The orbiting shaft portion 4b that is eccentric from the main shaft portion 4a of the crankshaft 4 and is disposed at the upper end portion of the crankshaft 4 engages and slides with the orbiting bearing 10 of the orbiting scroll 9 and is disposed at the lower end portion of the crankshaft 4. The auxiliary shaft portion 4c is pivotally supported by an auxiliary bearing 19 fixed by welding or shrink fitting in the sealed container 1, and is supported at three points of the main shaft portion 4a, the turning shaft portion 4b, and the auxiliary shaft portion 4c. ing. Between the support disk 9a of the orbiting scroll 9 and the first thrust bearing 15a provided on the main body frame 5, a minute gap capable of forming an oil film is provided. An annular seal member 16 that is substantially concentric with the slewing bearing 10 is mounted on the support disk 9a in a loose state, and the annular seal member 16 partitions the inner back chamber 17 and the outer back pressure chamber 18 from each other. .

  The lubricating oil sucked up by the oil supply pump device 8 passes through the oil hole 7 of the crankshaft 4 and is guided to the axial inner space 20 formed between the orbiting bearing 10 and the orbiting shaft portion 14 of the orbiting scroll 9. Is connected to a back pressure chamber 18 formed by being surrounded by the fixed scroll 6 and the main body frame 5 through a throttle portion 21 provided on the back surface of the support disk 9a of the orbiting scroll 9, and the orbiting scroll 9 is fixedly scrolled. The lap 6b is guided to the suction chamber 13 through the back pressure regulating valve 22 having the function of pressing against the second thrust bearing 15b on the outer peripheral portion of the wrap 6b and the oil supply passage 22a. The other is guided to the compression space 11 via the passage 26 inside the orbiting scroll 9, and oil is supplied to the sliding portion between the orbiting scroll wrap 9 b and the end plate 6 a of the fixed scroll 6. The remaining oil that has not flowed to the compression section passes through the slewing bearing 10, the back chamber 17, and the main bearing 14 and is discharged to the outside of the compression section.

  A check valve device 23 that opens and closes the outlet side of the discharge port 12 is mounted on the plane of the end plate 6a of the fixed scroll 6, and the check valve device 23 includes a reed valve 23a made of a thin steel plate and a valve presser 23b. Become.

  About the scroll compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

FIG. 2 is a three-dimensional view showing the positional relationship between the orbiting scroll wrap 9 b and the slope 24 of the orbiting scroll 9. The height ratio when the height of the uppermost part of the orbiting scroll wrap 9b is h and the height of the deepest part of the slope 24 is h1 is h1 / h. By configuring the slope 24 toward the center of the spiral at the portion that affects the compression function and the sealing function on the upper surface of the orbiting scroll wrap 9b, the original orbiting scroll wrap 9b can be formed without greatly changing the shape of the orbiting scroll wrap 9b. It is possible to reduce the volume ratio at the start of suction and the end of compression. In particular, by providing the slope 24 at the position of the optimum volume ratio at a volume ratio where the pressure difference becomes small at low load, over-compression during fluid discharge is reduced, and high performance can be achieved. Further, since the height of the scroll wrap 9b is reduced, the bending moment applied to the wall surface of the scroll wrap 9b due to the fluid pressure is reduced, the strength of the base portion of the scroll wrap 9b is improved, and high reliability can be obtained. . In addition, since only the machining program is changed, a scroll compressor corresponding to various performance ranks with high performance can be obtained without significantly increasing the cost.

  In the graph of FIG. 3, the horizontal axis represents the height ratio (h1 / h), and the vertical axis represents the measurement result of the leakage flow rate from the slope 24 in a state where oil is mixed. As can be seen from FIG. 3, when the height ratio is 0.95 or more, the flow rate varies due to the influence of the oil seal. Therefore, by setting the height ratio to 0.95 or less, it is possible to obtain a fixed amount of fluid discharge according to the height ratio without being affected by the oil seal, and to minimize variations in the overcompression reduction amount. It is possible to stabilize the performance.

  Further, as shown in FIG. 4, the slope 24 intersects with only one of the outer wall side and the inner wall side of the orbiting scroll wrap 9b, so that the volume ratio of the orbiting scroll wrap 9b is essentially the outer wall of the orbiting scroll wrap 9b. Only one of the volume ratio formed or the volume ratio formed by the inner wall of the orbiting scroll wrap 9b can be changed, and the degree of freedom in design is increased.

  Further, as shown in FIG. 5, by having two slopes 24 having different start positions, the volume ratio formed by the outer wall of the orbiting scroll wrap 9b and the inner wall of the orbiting scroll wrap 9b in the volume ratio originally possessed by the orbiting scroll wrap 9b. The volume ratio formed by can be changed at the same time, and the degree of freedom of design is expanded.

  Further, as shown in FIG. 6, by having two slopes 24 having different height ratios, in the compression chamber formed by the outer wall of the scroll wrap and the compression chamber formed by the inner wall of the scroll wrap 9b, When fluid discharge is optimal and overcompression is performed in the other compression chamber, reducing the height ratio on only one side reduces fluid discharge resistance and improves overcompression. In addition, since the height ratio of the compression chamber, which is optimal fluid discharge, can be constant, it is possible to suppress performance deterioration due to recompression due to an increase in dead volume.

As described above, the scroll compressor according to the present invention has a high performance without significantly changing the configuration of the compressor by configuring the slope in the portion that affects the compression function and the sealing function of the upper surface of the scroll wrap. In addition to air compressors using HFC refrigerants and HCFC refrigerants, scroll compressors compatible with various capacity ranks can be obtained, such as air conditioners and heat pump water heaters using natural refrigerant CO ₂ . It can also be applied to applications.

The longitudinal cross-sectional view of the vertical scroll compressor in Embodiment 1 of this invention A three-dimensional view of the slope of the upper surface of the orbiting scroll wrap in the first embodiment of the present invention The characteristic view which shows the flow volume in the height difference of the deepest part of the slope provided in the turning scroll wrap upper surface in Embodiment 1 of this invention The three-dimensional figure of the slope which cross | intersects only the outer wall of the turning scroll wrap upper surface in Embodiment 1 of this invention Three-dimensional view of two slopes having different start positions on the upper surface of the orbiting scroll wrap in the first embodiment of the present invention Three-dimensional view of two slopes having different height ratios on the upper surface of the orbiting scroll wrap in Embodiment 1 of the present invention Enlarged plan view of the mechanism of a conventional vertical scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Discharge pipe 3 Motor 3a Rotor 3b Stator 4 Crankshaft 4a Main shaft part 4b Turning shaft part 4c Subshaft part 5 Body frame 6 Fixed scroll 6a End plate 6b Fixed scroll wrap 7 Oil hole 8 Oil supply pump device 9 Turning scroll 9a support disk 9b orbiting scroll lap 10 orbiting bearing 11 compression space 12 discharge port 13 suction chamber 14 main bearing 15a first thrust bearing 15b second thrust bearing 16 annular seal member 17 back chamber 18 back pressure chamber 19 sub bearing 20 Internal space 21 Throttle part 22 Back pressure adjustment valve 22a Oil supply passage 23 Check valve device 23a Reed valve 23b Valve retainer 24 Slope

Claims (5)

In contrast to the spiral fixed scroll wrap formed upright on one side of the end plate that forms part of the fixed scroll, the wrap that forms a part of the orbiting scroll stands upright on the support disc, and the fixed scroll wrap A revolving scroll wrap having a similar shape is meshed with each other to form a pair of spiral symmetric compression spaces between the scrolls, and a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap. A suction chamber is provided outside the scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation prevention member, whereby the respective compression spaces are continuously shifted from the suction side toward the discharge side. A scroll compressor which is partitioned into a plurality of compression chambers and changes in volume so as to compress fluid, the compressor on the upper surface of the scroll wrap And a scroll compressor which is characterized by being configured to slope toward the spiral center to affect part sealing function. The scroll compressor according to claim 1, wherein the height of the deepest part of the slope is 0.95 or less with respect to the height of the uppermost part of the scroll wrap. The scroll compressor according to claim 1 or 2, wherein the slope intersects only one of the outer wall and the inner wall of the scroll wrap. The scroll compressor according to claim 1, wherein the scroll compressor has two slopes having different start positions. The scroll compressor according to any one of claims 1 to 4, wherein the scroll compressor has two slopes having different height ratios.