JP2008002286A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor for restraining the deterioration of performance by maintaining predetermined back pressure by improving the sealability of a back pressure valve. <P>SOLUTION: A back pressure valve element 34 is formed in a disk shape having a conical projection 34a. The sealing performance of the valve can be secured by opening and closing the valve by the projection 34a and a valve seat 35. Since the predetermined back pressure can be maintained, a turning scroll 15 is separated from a fixed scroll 14, and the scroll compressor capable of restraining the leakage of a compression space 37 and capable of restraining the deterioration of the performance can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the fixed scroll and the orbiting scroll are meshed with each other to form a compression chamber between them, and the use of the circular orbital motion of the orbiting scroll moves the compression chamber from the outer periphery to the center while reducing the volume. The present invention relates to a scroll compressor that repeatedly sucks, compresses and discharges fluid.

  Conventionally, this type of scroll compressor is provided with a back pressure control mechanism. (For example, refer to Patent Document 1).

FIG. 5 shows a longitudinal sectional view of the rear portion of the compressor of the conventional scroll compressor described in Patent Document 1. As shown in FIG. As shown in the figure, a back pressure control mechanism 2 is formed on the fixed scroll 1.
JP 2005-163655 A

  However, in the above-described conventional configuration, a back pressure control valve is formed by pressing the back pressure valve body against the back pressure valve seat with the back pressure valve spring, and the back pressure valve body is a disk or a sphere, and the back pressure valve body is a disk. Therefore, it is necessary to finish the back pressure valve seat with high surface accuracy.If the back pressure valve body is a sphere, it is in line contact with the back pressure valve seat, and the back pressure valve body position is slightly shifted between the back pressure valve seat and the back pressure valve body. In both cases, it is difficult to secure the seal between the back pressure valve seat and the back pressure valve body in terms of processing and assembly, leakage occurs, and the specified back pressure cannot be maintained. Due to the shortage, the orbiting scroll is separated from the fixed scroll, and the performance is deteriorated due to the leakage of the compression chamber.

  The present invention solves the above-mentioned conventional problems, and by improving the sealing performance of the back pressure valve seat and the back pressure valve body and maintaining a predetermined back pressure, the orbiting scroll is not pulled away from the fixed scroll, resulting in a decrease in performance. An object is to provide a highly efficient scroll compressor without happening.

  In order to solve the above-mentioned conventional problems, the scroll compressor according to the present invention is such that the back pressure valve body has a disk shape having a conical protrusion.

  As a result, the sealing performance between the back pressure valve seat and the back pressure valve body can be ensured, and a predetermined back pressure can be maintained. Therefore, the orbiting scroll is not pulled away from the fixed scroll, and leakage of the compression chamber can be suppressed.

  In the scroll compressor of the present invention, the orbiting scroll is not separated from the fixed scroll, and leakage of the compression chamber can be suppressed.

In a first aspect of the present invention, a compression mechanism, an electric motor, and an oil reservoir are arranged in an airtight container, and the compression mechanism is opposed to the fixed scroll having a spiral wrap on the end plate, and the wrap of the fixed scroll. The orbiting scroll having a meshing lap, a main bearing member provided at a position sandwiching the orbiting scroll by the fixed scroll, and an orbiting bearing portion provided on the end plate of the orbiting scroll, and orbiting the orbiting scroll. A crankshaft having an orbiting shaft; a main bearing portion provided on the main bearing member for supporting the crankshaft; and a high pressure portion serving as a discharge pressure and an intermediate pressure in the back space of the orbiting scroll on the main bearing member. Partitioning means for partitioning into the back pressure chamber, and through an oil supply passage that penetrates the oil in the oil reservoir axially through the crankshaft. A refueling mechanism for supplying the revolving bearing end space to the revolving bearing section space, and a refueling path for communicating the revolving bearing section space and the back pressure chamber is provided in the revolving scroll mirror slope, and the back pressure chamber and the suction chamber are inhaled. A suction communication passage communicating with the chamber is provided in the fixed scroll, and a communication passage valve chamber having a spring, a back pressure valve body, and a valve seat is formed in the suction communication passage, and a differential pressure between the back pressure and the suction pressure is generated. In a hermetic scroll compressor provided with a back pressure control mechanism that presses the back pressure valve body against a valve seat until a predetermined value or more is normally closed, the back pressure valve body has a disc shape and has a conical protrusion. By closing the valve with the projection and the valve seat, processing and assembly are easy, the seal between the valve body and the valve seat is ensured, and the predetermined back pressure can be maintained, so that leakage of the compression chamber can be suppressed. As a result, performance degradation can be suppressed.

  In the second invention, in particular, the clearance between the inner diameter of the communication passage valve chamber of the first invention and the outer diameter of the back pressure valve body is set to such a dimension that the protrusion does not come off the valve seat, so that the back pressure valve body is displaced. However, since the seal between the valve body and the valve seat is ensured and a predetermined back pressure can be maintained, leakage of the compression chamber can be suppressed, so that a decrease in performance can be suppressed.

  In the third invention, in particular, a notch is provided on the outer periphery of the back pressure valve body of the second invention, so that even when the clearance between the inner diameter of the communication passage valve chamber and the outer diameter of the back pressure valve body is small, the valve Since the amount of oil supplied to the suction chamber can be secured when the valve is opened, leakage between the compression chambers can be suppressed and the lubricity can be improved, so that a decrease in performance and a decrease in reliability can be suppressed.

  In the fourth aspect of the invention, in particular, by providing conical protrusions on both surfaces of the back pressure valve body of any one of the first to third aspects, it is possible to avoid defects due to reverse assembly during assembly. And cost increase due to defects can be suppressed.

  In the fifth aspect of the invention, in particular, by making the total height of the back pressure valve body of any one of the first to fourth aspects equal to or greater than the inner diameter of the communication passage valve chamber, it is possible to avoid defects caused by sideways assembly during assembly. And cost increase due to defects can be suppressed.

  In the sixth invention, in particular, the back pressure valve body according to any one of the first to fifth inventions is formed of an elastic body, so that the sealing performance between the back pressure valve body and the valve seat is improved and a predetermined back pressure is maintained. Since it is possible to suppress the leakage of the compression chamber, it is possible to suppress the performance degradation.

  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 a first embodiment of the present invention. FIG. 2 shows a longitudinal sectional view of the back pressure control mechanism in the first embodiment of the present invention.

In FIG. 1 and FIG. 2, fixing is performed between the main bearing member 13 of the crankshaft 12 fixed in the sealed container 11 by welding or shrink fitting and the fixed scroll 14 bolted on the main bearing member 13. An Oldham that sandwiches the orbiting scroll 15 meshing with the scroll 14 to form a scroll-type compression mechanism 16 and guides the orbiting scroll 15 to rotate between the orbiting scroll 15 and the main bearing member 13 so as to move in a circular orbit. A rotation prevention mechanism 17 using a ring or the like is provided, and a turning shaft portion 12 a at the upper end of the crankshaft 12 is fitted to a turning bearing 18 provided on the turning scroll 15. A suction chamber 19 for sucking refrigerant gas is provided on the outer peripheral portion of the fixed scroll 14, and a suction pipe 20 communicating with the outside of the sealed container 11 is fitted.

  The lower end of the crankshaft 12 reaches an oil reservoir 21 below the sealed container 11 and is pivotally supported by a secondary bearing member 22 fixed by welding or shrink fitting in the sealed container 11.

  The electric motor 23 is located between the main bearing member 13 and the auxiliary bearing member 22, and is integrally coupled to the stator 23 a fixed to the sealed container 11 by welding or shrink fitting, and the outer periphery in the middle of the crankshaft 12. The rotor 23b and the crankshaft 12 are stably rotated on the outer peripheral portions of the upper and lower end surfaces of the rotor 23b, and the orbiting scroll 15 is stably moved in a circular orbit. Balance weights 25a and 25b fixed by 24 are provided.

  The oil supply mechanism is constituted by a pump 26 driven at the lower end of the crankshaft 12, and an oil supply passage 27 penetrating in the axial direction is formed in the crankshaft 12 to supply oil in the oil reservoir 21.

  A back pressure chamber 28 is formed on the outer periphery of the orbiting scroll 15 by the fixed scroll 14 and the main bearing member 13, and the back pressure chamber radially extends from the orbiting bearing portion space 29 formed between the orbiting shaft portion 12 a and the orbiting scroll 15. An oil supply path 30 penetrating up to 28 is provided in the end plate 15 a of the orbiting scroll 15.

  The main bearing member 13 side of the end plate 15a of the orbiting scroll 15 is partitioned by a sealing material 31 having a rectangular cross section disposed on the main bearing member 13, and the inside is a high pressure and the outside is a back pressure chamber 28. The suction chamber 19 is communicated by a suction communication passage 32, and a communication passage valve chamber 36 having a spring 33, a back pressure valve body 34, and a valve seat 35 is formed in the suction communication passage 32, and a differential pressure between the back pressure and the suction pressure. A back pressure control mechanism is provided in which the back pressure valve body 34 is pressed against the valve seat 35 until the pressure becomes equal to or greater than a certain value, so as to be normally closed.

  The back pressure valve body 34 has a disk-like shape and has a conical protrusion 34 a, and the valve is opened and closed by the protrusion 34 a and the valve seat 35.

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

  First, as the crankshaft 12 is rotationally driven by the electric motor 23, the orbiting shaft portion 12a at the upper end of the crankshaft 12 is eccentrically driven to cause the orbiting scroll 15 to move in a circular orbit, thereby the fixed scroll 14 and the orbiting scroll. The suction chamber 37 formed between the suction pipe 20 and the fixed scroll 14 is connected to the outside of the hermetic container 11 by making use of the fact that the compression chamber 37 formed between the outer peripheral side and the center portion becomes smaller. The refrigerant gas is sucked in from 19 and compressed, and the refrigerant gas having a predetermined pressure or higher is discharged from the discharge port 38 at the center of the fixed scroll 14 to the discharge chamber 40 in the container by opening the reed valve 39. repeat.

  The discharged refrigerant gas passes through the discharge gas passage 41 penetrating the compression mechanism section 16 and reaches the upper portion of the rotor 23b, passes through the rotor gas passage 42 penetrating the rotor 23b, and enters the lower portion of the hermetic container 11. Guided through the stator gas passage 43 disposed on the outer periphery of the stator 23a and the compression mechanism section notch 44 disposed on the outer periphery of the compression mechanism section 16 and reaching the upper portion of the sealed container 11, and from the discharge pipe 45 to the outside of the sealed container 11 Is discharged.

  The oil in the oil reservoir 21 is supplied to the swivel bearing space 29 through an oil supply passage 27 that passes through the crankshaft 12 in the axial direction by a pump 26. The supplied oil is branched into two systems, and one system lubricates the slewing bearing 18 and the slewing shaft portion 12a, lubricates the main shaft portion 12b and the main bearing 46, and then drops under the main bearing member 13, finally. The oil is collected in the oil reservoir 21.

  The other system is guided to the back pressure chamber 28 through the oil supply path 30 by the differential pressure between the slewing bearing space 29 and the back pressure chamber 28.

In the communication passage valve chamber 36 in the suction communication passage 32, the valve opens when the differential pressure between the back pressure and the suction pressure becomes larger than the urging force of the spring 33, and the oil guided to the back pressure chamber 28 passes through the suction communication passage 32. Here, the back pressure valve element 34 has a disk shape and has a conical protrusion 34 a, and the valve is opened and closed by the protrusion 34 a and the valve seat 35. Therefore, the sealing performance of the valve is improved and a predetermined back pressure can be maintained.

  As described above, in the present embodiment, the back pressure valve element 34 has a disc shape and has the conical protrusion 34a, and the valve is sealed by opening and closing the valve by the protrusion 34a and the valve seat 35. The performance can be improved and the predetermined back pressure can be maintained, so that the performance degradation can be suppressed.

  Further, in the present embodiment, the clearance between the inner diameter of the communication passage valve chamber 36 and the outer diameter of the back pressure valve body 34 is set to such a dimension that the protrusion 34 a does not come off from the valve seat 35. Even in the case of deviation, a seal between the back pressure valve body 34 and the valve seat 35 can be secured, and a predetermined back pressure can be maintained, so that a decrease in performance can be suppressed.

  Further, as shown in FIG. 3, by providing a notch 34b on the outer periphery of the back pressure valve body 34, the valve opens even when the clearance between the inner diameter of the communication passage valve chamber 36 and the outer diameter of the back pressure valve body 34 is small. Since the area of the oil supply passage to the suction chamber 19 can be ensured, the amount of oil supply can be ensured, the leakage of the compression chamber 37 can be suppressed, and the lubricity can be improved.

  Further, by providing the conical protrusions 34a on both surfaces of the back pressure valve body 34 as shown in FIG. 4, it is possible to avoid defects caused by assembling in the reverse direction during assembly, and to suppress an increase in cost due to the defects. .

  Further, by setting the total height of the back pressure valve body 34 to be equal to or larger than the inner diameter of the communication passage valve chamber 36, it is possible to avoid defects caused by assembling sideways at the time of assembly, and to suppress an increase in cost due to the defects.

  Further, by configuring the back pressure valve body 34 with an elastic body, the sealing performance between the back pressure valve body 34 and the valve seat 35 is improved, and a predetermined back pressure can be maintained, so that leakage of the compression chamber 37 can be suppressed. Performance degradation can be suppressed.

  As described above, in the scroll compressor according to the present invention, the orbiting scroll is not pulled away from the fixed scroll, and the leakage of the compression chamber can be suppressed, so that the performance degradation can be suppressed. Machine can be provided. Furthermore, it is possible to make the product more comfortable and environmentally friendly as an air conditioner such as a room air conditioner or a heat pump water heater.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention 1 is a longitudinal sectional view of a back pressure control mechanism according to Embodiment 1 of the present invention. The perspective view of the back pressure valve body in Embodiment 1 of this invention The perspective view of the back pressure valve body in Embodiment 1 of this invention A longitudinal sectional view of a back pressure control mechanism of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Sealed container 12 Crankshaft 12a Orbiting shaft part 12b Main axis part 13 Main bearing member 14 Fixed scroll 15 Orbiting scroll 15a End plate 16 Compression mechanism 17 Anti-rotation mechanism 18 Orbiting bearing 19 Suction chamber 20 Suction pipe 21 Oil reservoir 22 Sub bearing member 23 Electric motor 23a Stator 23b Rotor 24 Pins 25a, 25b Balance weight 26 Pump 27 Oil supply passage 28 Back pressure chamber 29 Swivel bearing portion space 30 Oil supply passage 31 Seal material 32 Suction communication passage 33 Spring 34 Back pressure valve body 34a Protruding portion 34b Notch 35 Valve seat 36 Communication passage valve chamber 37 Compression chamber 38 Discharge port 39 Reed valve 40 Discharge chamber in container 41 Discharge gas passage 42 Rotor gas passage 43 Stator gas passage 44 Notch 45 compression mechanism section 45 Discharge pipe 46 Main bearing

Claims (6)

A compression mechanism section, an electric motor, and an oil reservoir are arranged in a sealed container, and the compression mechanism section has a fixed scroll having a spiral wrap on the end plate, and a turning scroll having a wrap meshing with the wrap of the fixed scroll. And a crankshaft having a main bearing member provided at a position sandwiching the orbiting scroll with the fixed scroll, and an orbiting shaft that engages with the orbiting bearing portion provided on the end plate of the orbiting scroll to orbit the orbiting scroll. And a main bearing portion provided on the main bearing member for pivotally supporting the crankshaft, and similarly, the back space of the orbiting scroll is partitioned into the main bearing member into a high pressure portion serving as a discharge pressure and a back pressure chamber serving as an intermediate pressure. The pivot shaft end through an oil supply passage having partition means and penetrating oil in the oil reservoir axially through the crankshaft. An inhalation mechanism having an oil supply mechanism for supplying to the orbiting bearing portion space, an oil supply path for communicating the orbiting bearing portion space and the back pressure chamber provided in the orbiting scroll end plate, and communicating the back pressure chamber and the intake chamber. A communication passage is provided in the fixed scroll, and a communication passage valve chamber having a spring, a back pressure valve body, and a valve seat is formed in the suction communication passage, and the differential pressure between the back pressure and the suction pressure becomes a predetermined value or more. In the hermetic scroll compressor provided with a back pressure control mechanism that presses the back pressure valve body against a valve seat and normally closes the back pressure valve body, the back pressure valve body has a disk-like shape and has a conical protrusion, and the protrusion A scroll compressor characterized in that the valve is closed by a part and a valve seat. 2. The scroll compressor according to claim 1, wherein the clearance between the inner diameter of the communication passage valve chamber and the outer diameter of the back pressure valve body is set to a dimension that prevents the protrusion from being detached from the valve seat. The scroll compressor according to claim 2, wherein a notch is provided on an outer periphery of the back pressure valve body. The scroll compressor according to any one of claims 1 to 3, wherein the protrusions are provided on both surfaces of the back pressure valve body. The scroll compressor according to any one of claims 1 to 4, wherein an overall height of the back pressure valve body is equal to or larger than an inner diameter of the communication passage valve chamber. The scroll compressor according to any one of claims 1 to 5, wherein the back pressure valve body is formed of an elastic body.

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