JP2006183518A - Vacuum prevention device for scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum prevention device for a scroll compressor capable of preventing an inside of a hermetic vessel from getting in a vacuum condition by selectively making communication between a low pressure space and a high pressure space of the hermetic vessel by pressure difference between the low pressure space of the hermetic vessel and a compression pocket formed by a lap of a turning scroll and a lap of a fixed scroll. <P>SOLUTION: The vacuum prevention device for the scroll compressor composed of the hermetic vessel 10 divided in the high pressure space H and the low pressure space L, the fixed scroll 50 in the hermetic vessel, and the turning scroll 60 meshing with the fixed scroll and turning, is provided with a communication flow passage F making communication between the high pressure space, the low pressure space of the hermetic vessel and the compression pocket, a slider movably inserted in the communication flow passage and making or shutting off communication between the high pressure space and the low pressure space of the hermetic vessel by pressure difference between the low pressure space of the hermetic vessel and the compression pocket, and an elastic support means elastically supporting the slider. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll compressor, and more specifically, a scroll compressor that not only prevents the inside of a hermetic container from being in a vacuum state during operation but also smoothly performs an operation to prevent vacuum. The present invention relates to a vacuum prevention device.

  Generally, a compressor converts electric energy into kinetic energy, and compresses refrigerant gas with the kinetic energy. A compressor is a core element that constitutes a refrigeration cycle system, such as a rotary compressor, a scroll compressor, and a reciprocal compressor by a compression mechanism that compresses refrigerant. There are various types. Such compressors are used in refrigerators, air conditioners, showcases and the like.

  FIG. 8 shows an example of a conventional scroll compressor. As shown in FIG. 8, the scroll compressor includes an airtight container 10, a main frame 20 and a subframe 30 fixedly coupled to the upper and lower sides of the airtight container 10, and the main frame 20 and the subframe 30. A drive motor 40 fixedly coupled to the inside of the sealed container 10 so as to be positioned therebetween, a fixed scroll 50 fixedly coupled to the inside of the sealed container 10 at a predetermined interval from the main frame 20, and the fixed scroll 50 The orbiting scroll 60 positioned between the fixed scroll 50 and the main frame 20 so as to engage with each other so as to be able to perform the orbiting movement, the rotary shaft 70 for transmitting the driving force of the drive motor 40 to the orbiting scroll 60, the orbiting scroll 60 and the main frame 20. Of the closed container 10 and the Oldham ring 80 inserted between Part configured to include a high-low pressure separation plate 90 which separates into a high pressure space H and a low-pressure space L, and the.

  The sealed container 10 is connected with a suction pipe 1 through which gas is sucked and a discharge pipe 2 through which gas is discharged. The suction pipe 1 is located in the low pressure space L, and the discharge pipe 2 is located in the high pressure space H. The low pressure space L of the sealed container 10 is a space where gas is sucked, and the high pressure space H is a space where compressed gas is discharged. The lower part of the hermetic container 10 is filled with oil supplied to the sliding portion.

  The fixed scroll 50 includes a body portion 51 having a predetermined shape, a wrap 52 formed in an involute shape below the body portion 51, and a discharge hole 53 formed through the center of the body portion 51.

  The orbiting scroll 60 includes an end plate portion 61 having a predetermined area, a wrap 62 formed in an involute shape on the upper surface of the end plate portion 61, and a boss portion 63 formed on the lower surface of the end plate portion 61.

  The drive motor 40 includes a stator 42 that is fixedly coupled to the inner peripheral surface of the sealed container 10, a winding coil 43 that is wound around the stator 42, and a rotation that is rotatably inserted into the stator 42. And a child 44.

  The rotating shaft 70 includes an eccentric portion 71. Further, the rotary shaft 70 is press-fitted into the rotor 44 and is inserted through the main frame 20, and the eccentric portion 71 is inserted into the orbiting scroll boss portion 63.

Reference numeral 100 denotes backflow prevention means for preventing backflow of the discharge gas.
The operation of the scroll compressor as described above is as follows.

  First, power is applied to the drive motor 40 to activate the drive motor 40. When the rotary shaft 70 rotates in response to the transmission of the rotational force of the drive motor 40, the orbiting scroll 60 coupled to the eccentric portion 71 of the rotary shaft performs a orbiting motion based on the axis center of the rotary shaft 70. The orbiting scroll 60 orbits while being prevented from rotating by the Oldham ring 80.

  As the orbiting scroll 60 orbits, the orbiting scroll wrap 62 meshes with the stationary scroll wrap 52 and the orbiting scroll wrap 62 and the orbiting scroll wrap 62 and the stationary scroll wrap 52 form a plurality of compression pockets P. The plurality of compression pockets P move to the central part of the fixed scroll 50 and the orbiting scroll 60, and at the same time, the gas is sucked in and compressed while changing the volume, and discharged through the discharge holes 53 of the fixed scroll 50.

  The compression pocket P is formed continuously as the orbiting scroll 60 orbits. When the compression pocket P is located at the edge of the fixed scroll 50, the compression pocket P is in a low pressure state that is a suction pressure, and when it is located in the center of the fixed scroll 50, it is in a high pressure state that is a discharge pressure. When it is located between the center and the center, it is in an intermediate pressure state.

  The high-temperature and high-pressure gas discharged to the discharge hole 53 of the fixed scroll 50 flows out of the sealed container 10 through the high-pressure space H of the sealed container 10 and the discharge pipe 2.

  The scroll compressor constitutes a refrigeration cycle system. In the refrigeration cycle system, when the scroll compressor operates, high-temperature and high-pressure gas discharged from the scroll compressor passes through a condenser, a capillary tube, and an evaporator. The gas passing through the evaporator flows into the scroll compressor, and such a circulation process is repeated.

  On the other hand, a problem occurs in the refrigeration cycle system or a problem occurs on the suction side of the scroll compressor, and the scroll is sucked into the sealed container 10 of the scroll compressor through the suction pipe 1 in a state where the gas is shut off. When the operation of the compressor is continued, the low pressure space L of the sealed container 10 is maintained in a vacuum state. When the low-pressure space L of the sealed container 10 is in a vacuum state, vacuum discharge is generated from a terminal portion that is located on the low-pressure space L side of the sealed container 10 and is connected to the drive motor 40 to induce damage to the compressor. In particular, when the terminal and the insulating coating connected to the terminal are defective, there is a high probability that vacuum discharge will occur.

  Further, since the drive motor 40 is located in the low pressure space L of the sealed container 10, when the low pressure space L of the sealed container 10 is maintained in a vacuum state, heat generated by the drive motor 40 cannot be effectively transmitted to the outside. Therefore, the problem that the wire insulation film is damaged by overheating of the drive motor 40 occurs.

  In order to solve such a problem, many researches and developments are in progress, and as one method for improving the problem, the high-pressure space H and the low-pressure space L of the sealed container 10 are communicated. A connection channel is provided, and a valve that reacts according to the gas temperature of the high-pressure space H of the sealed container 10 is provided on the connection channel side. When the high-pressure space H of the hermetic container 10 reaches a set temperature or higher, the valve reacts to open the connection flow path, thereby communicating the high-pressure space H and the low-pressure space L of the hermetic container 10. This prevents the low-pressure space L of the sealed container 10 from being evacuated.

  However, such a method has a problem that the operability of the valve is remarkably reduced or not activated when a predetermined pressure or more is applied to the connection flow path.

  The present invention is to solve the above-mentioned problems, and an object of the present invention is to reduce the pressure between the compression pocket formed by the orbiting scroll wrap and the fixed scroll wrap and the low-pressure space of the sealed container. Depending on the difference, the high-pressure space and the low-pressure space of the closed container are selectively communicated or blocked, so that not only the inside of the closed container is evacuated but also the high-pressure space and low-pressure of the closed container are prevented. An object of the present invention is to provide a scroll compressor vacuum preventer capable of smoothly performing an operation of communicating or blocking a space.

  In order to achieve the object of the present invention, a sealed container partitioned into a high-pressure space and a low-pressure space, a fixed scroll provided in the sealed container, and a swivel that swivels in mesh with the fixed scroll. A scroll compressor vacuum preventer comprising a scroll, and a high-pressure space, a low-pressure space of the hermetic container, and a connected flow connecting a compression pocket formed by a wrap of the fixed scroll and a wrap of the orbiting scroll A slider that is movably inserted into the channel and the connecting flow path, and that connects or closes the high-pressure space and the low-pressure space of the sealed container by a pressure difference between the low-pressure space and the compression pocket of the sealed container; There is provided a vacuum preventing device for a scroll compressor comprising elastic support means for elastically supporting the slider.

  The vacuum preventer for a scroll compressor according to the present invention provides a vacuum state inside the sealed container when the gas cannot be smoothly sucked into the sealed container through the suction pipe of the compressor or the suction is shut off during the compressor operation. By preventing this, the compressor can be prevented from being damaged due to the vacuum inside the sealed container, so that the reliability of the compressor can be improved.

  In addition, since the annular groove is formed on the outer peripheral surface of the slider, the slider moves more smoothly, thereby preventing the inside of the sealed container from being evacuated quickly and sensitively. In addition, the reliability can be further improved, and in addition, there is an effect that the compression efficiency can be increased by preventing gas leakage.

  Hereinafter, the vacuum prevention device of the scroll compressor of the present invention will be described in detail with reference to embodiments shown in the drawings.

  FIG. 1 is a cross-sectional view showing a scroll compressor provided with an embodiment of a vacuum prevention device for a scroll compressor according to the present invention, and FIG. 2 is a cross-sectional view showing the vacuum prevention device for the scroll compressor. . The same reference numerals are assigned to the same parts as those in the prior art.

  As shown in the figure, the scroll compressor equipped with the scroll compressor vacuum preventer according to the present invention includes a hermetic container 10 and a main frame 20 and a subframe fixedly coupled to the upper and lower sides of the hermetic container 10, respectively. 30, a drive motor 40 fixedly coupled to the inside of the sealed container 10 so as to be positioned between the main frame 20 and the subframe 30, and fixedly coupled to the inside of the sealed container 10 at a predetermined interval from the main frame 20. The fixed scroll 50, the orbiting scroll 60 that meshes with the fixed scroll 50 so as to be capable of turning motion, and the rotary shaft 70 that transmits the driving force of the drive motor 40 to the turning scroll 60. And the rotation of the orbiting scroll 60 inserted between the orbiting scroll 60 and the main frame 20. The Oldham ring 80 for preventing comprises the interior of the sealed container 10 and the high-low pressure separation plate 90 which separates into a high pressure space H and a low-pressure space L, include. One side of the high / low pressure separating plate 90 is coupled to the upper surface of the fixed scroll 50, and the other side of the high / low pressure separating plate 90 is coupled to the sealed container 10.

The sealed container 10 is connected to a suction pipe 1 for sucking gas and a discharge pipe 2 for discharging gas. The suction pipe 1 is located in the low pressure space L, and the discharge pipe 2 is located in the high pressure space H. The lower part of the hermetic container 10 is filled with oil supplied to the sliding portion.
Such a configuration is the same as that of the prior art, and a specific description thereof will be omitted.

  In addition, in one embodiment of the vacuum prevention device, the high pressure space H, the low pressure space L of the sealed container 10, the connecting flow path F that connects the compression pocket P formed by the fixed scroll wrap 52 and the orbiting scroll wrap 62. And a slider 110 that is movably inserted into the connecting flow path F and communicates or closes the high-pressure space H and the low-pressure space L of the sealed container 10 by a pressure difference between the low-pressure space L of the sealed container 10 and the compression pocket P. And elastic support means for elastically supporting the slider 110.

The connecting flow path F is desirably provided in the fixed scroll 50.
The fixed scroll 50 includes a body portion 51 having a predetermined shape, a wrap 52 formed in an involute shape below the body portion 51, and a discharge hole 53 formed through the center of the body portion 51.

  The connection flow path F is formed in the body portion 51 so that the sliding hole 54 formed with a predetermined depth on the side surface of the fixed scroll body portion 51 and the upper surface of the body portion 51 and the sliding hole 54 communicate with each other. And the second hole 56 formed in the body portion 51 so that the sliding hole 54 and the compression pocket P communicate with each other.

  The sliding hole 54 is preferably formed in a horizontal direction parallel to the upper surface of the body portion 51 and has a circular cross section. Further, the sliding hole 54 is exposed to the low pressure space L of the sealed container 10. It is desirable that the position of the second hole 56 is further located at the center of the fixed scroll 50 than the position of the first hole 55. The first hole 55 and the second hole 56 are formed in a vertical direction, and the inner diameter of the first hole 55 and the inner diameter of the second hole 56 are formed in a circle smaller than the inner diameter of the sliding hole 54.

  The compression pocket P in which the second hole 56 is located is one in which an intermediate pressure acts among the compression pockets P formed by the fixed scroll wrap 52 and the orbiting scroll wrap 62.

  The slider 110 has a body part 111 having a cross-sectional shape corresponding to the cross-sectional shape of the sliding hole 54 and a predetermined length, and has a cross-sectional area smaller than the cross-sectional area of the body part 111 on one side of the body part 111. The step protrusion 112 is formed to extend to the thickness and the pressure on the side of the compression pocket P acts, and the annular groove 113 is formed in an annular shape having a predetermined width and depth on the outer peripheral surface of the body 111. A stepped surface 114 is formed at a connecting portion between the stepped protrusion 112 and the body 111 by a difference in cross section between the stepped protrusion 112 and the body 111.

  The slider 110 is inserted into the connection flow path F so that the step protrusion 112 is positioned on the center side of the fixed scroll 50. The length of the step protrusion 112 of the slider 110 is such that the other end of the step protrusion 112 is positioned in the second hole 56 when the surface of one end of the step protrusion 112 contacts the end surface of the sliding hole 54. It is formed.

  As a modification of the slider 110, as shown in FIG. 3, a plurality of annular grooves 113 formed in the body portion 111 of the slider 110 are formed. By forming a plurality of annular grooves 113 on the outer peripheral surface of the body portion 111, the body portion 111 is partitioned into a plurality of portions.

  The elastic support means includes a spring 120 inserted into the connecting flow path F to elastically support the slider 110, a through hole 131 formed therein, and a spring support tube that press-fits into the sliding hole 54 and supports the spring 120. 130.

  The spring 120 is preferably a compression coil spring. One side of the spring 120 is supported on one side of the spring support tube 130, and the other side of the spring 120 is supported on one side of the slider 110. The through hole 131 of the spring support tube 130 communicates with the sliding hole 54.

Hereinafter, the effect of the vacuum prevention device of the scroll compressor of the present invention will be described.
First, as described in the prior art, when the rotary shaft 70 is rotated by receiving the rotational force of the drive motor 40, the orbiting scroll 60 coupled to the eccentric portion 71 of the rotary shaft rotates. A swiveling motion is performed with the axis center of the shaft 70 as a reference.

  As the orbiting scroll 60 orbits, the orbiting scroll wrap 62 meshes with the stationary scroll wrap 52 and the orbiting scroll wrap 62 and the orbiting scroll wrap 62 and the stationary scroll wrap 52 form a plurality of compression pockets P. The plurality of compression pockets P are moved to the center of the fixed scroll 50 and the orbiting scroll 60, and at the same time the volume is changed, gas is sucked in, compressed, and discharged through the fixed scroll discharge hole 53.

  The high-temperature and high-pressure gas discharged into the discharge hole 53 of the fixed scroll flows out of the sealed container 10 through the high-pressure space H of the sealed container 10 and the discharge pipe 2.

  As described above, in the normal operation state, as shown in FIG. 4, the pressure of the low pressure space L acts on one side of the slider 110 inserted into the sliding hole 54 and the intermediate pressure state is applied to the other side of the slider 110. The pressure of the compression pocket P acts. The intermediate pressure in the compression pocket P acts on the slider 110 through the second hole 56. Due to the pressure difference acting on both sides of the slider 110, the slider 110 moves to the spring 120 side while being compressed. When the slider 110 is moved and positioned on the spring 120 side, the slider 110 closes the first hole 55, and the first hole 55 on which the high discharge pressure acts and the low pressure space L side of the sealed container 10. And will not communicate. It is desirable that the annular groove 113 of the slider 110 is designed to be positioned in the first hole 55 in a state where the slider 110 is moved to the spring 120 side.

  On the other hand, when the scroll compressor is in operation, the side of the suction pipe 1 that sucks in gas is blocked, and if the gas does not flow through the suction pipe 1 or the gas does not flow smoothly, the sealed container 10 While the gas existing inside is compressed by the fixed scroll 50 and the orbiting scroll 60 and discharged into the high-pressure space H of the sealed container 10, the low-pressure space L of the sealed container 10 gradually becomes a vacuum state.

  When the low-pressure space L of the hermetic container 10 is gradually in a vacuum state, as shown in FIG. 5, the gas flowing into the compression pocket P formed by the orbiting scroll wrap 62 and the fixed scroll wrap 52 is reduced. The pressure in the pocket P is lowered. As a result, the pressure difference between the low pressure space L of the sealed container 10 and the inside of the compression pocket P becomes small, and the slider 110 moves to the inside of the sliding hole 54 by the elastic force of the spring 120.

  When the slider 110 moves to the inside of the sliding hole 54, the first hole 55 communicates with the low pressure space L of the sealed container 10 through a part of the sliding hole 54, and the gas in the high pressure space H of the sealed container 10 is The fluid flows into the low-pressure space L of the sealed container 10 through the sliding hole 54 of the first hole 55.

  The gas flowing into the low-pressure space L of the hermetic container 10 is also discharged into the high-pressure space H of the hermetic container 10 through the compression pocket P formed by the orbiting scroll wrap 62 and the fixed scroll wrap 52. Even if such a process is repeated and the gas sucked through the suction pipe 1 is blocked, the low-pressure space L of the sealed container 10 is prevented from being in a vacuum state.

  On the other hand, when the annular groove 113 of the slider 110 coincides with the first hole 55 in a state where the slider 110 moves to the spring 120 side, the pressure in the high-pressure space H of the sealed container 10 is changed as shown in FIG. Since the first hole 55 acts on the entire inside of the annular groove 113, the high pressure acting on the first hole 55 is distributed throughout the annular groove 113. As a result, the slider 110 moves smoothly due to the pressure difference acting on both sides of the slider 110 and the elastic force of the spring 120. If the annular groove 113 is not provided on the outer peripheral surface of the slider 110, the pressure in the high-pressure space H of the sealed container 10 acts only on a part of the outer peripheral surface of the slider 110 through the first hole 55. Does not move smoothly.

  Further, since the annular groove 113 is formed on the outer peripheral surface of the slider 110, the high pressure acting through the first hole 55 in a state where the slider 110 closes the first hole 55 causes the inner peripheral surface of the sliding hole 54 and the slider to slide. It is possible to minimize leakage through the outer peripheral surface of 110. When a plurality of annular grooves 113 are formed on the outer peripheral surface of the slider 110, gas leaked between the outer peripheral surface of the slider 110 and the inner peripheral surface of the sliding hole 54 is generated in the annular groove 113 as shown in FIG. While being reinflated repeatedly, the gas is more effectively blocked from leaking.

It is sectional drawing of the scroll compressor with which one Embodiment of the vacuum prevention apparatus of the scroll compressor of this invention was equipped. It is sectional drawing which shows the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the other modification of the slider which comprises the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the annular groove which comprises the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows the operation state of the annular groove which comprises the vacuum prevention apparatus of the scroll compressor of this invention. It is sectional drawing which shows a common scroll compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sealing container 50 Fixed scroll 54 Sliding hole 55 1st hole 56 2nd hole 60 Orbiting scroll 110 Slider 111 Body part 112 Step projection part 113 Ring-shaped groove 120 Spring 130 Spring support pipe F Connection flow path H High pressure space L Low pressure space

Claims (10)

Vacuum prevention of a scroll compressor composed of a hermetic container partitioned into a high-pressure space and a low-pressure space, a fixed scroll provided inside the hermetic container, and a turning scroll that orbits and engages with the fixed scroll. A device,
A high-pressure space, a low-pressure space of the hermetic container, and a connecting flow path for connecting a compression pocket formed by a wrap of the fixed scroll and a wrap of the orbiting scroll;
A slider that is movably inserted into the connecting flow path and connects or closes the high-pressure space and the low-pressure space of the hermetic container by a pressure difference between the low-pressure space of the hermetic container and a compression pocket;
Elastic support means for elastically supporting the slider;
An anti-vacuum device for a scroll compressor, comprising:   2. The scroll compressor vacuum preventer according to claim 1, wherein the connection channel is provided in the fixed scroll.   The connecting flow path includes a sliding hole formed with a predetermined depth on a side of the fixed scroll so as to be exposed to the low pressure space of the sealed container, and the high pressure space of the sealed container and the sliding hole communicate with each other. And a second hole formed in the fixed scroll so that the sliding hole and the compression pocket communicate with each other. A vacuum preventing device for a scroll compressor according to 2.   4. The scroll compressor according to claim 3, wherein an intermediate pressure of the compression pocket formed by the fixed scroll wrap and the orbiting scroll wrap acts on the compression pocket in which the second hole is located. 5. Vacuum prevention device.   4. The scroll compressor vacuum prevention device according to claim 3, wherein the position of the second hole is located further to the center side of the fixed scroll than the position of the first hole. 5.   4. The scroll compressor vacuum preventer according to claim 3, wherein the first hole is located on an upper surface of the fixed scroll. 5.   The slider has a body portion having a cross-sectional shape corresponding to the cross-sectional shape of the sliding hole and a predetermined length, and has a cross-sectional area smaller than the cross-sectional area of the body portion on one side of the body portion and extending to a predetermined length. The stepped protrusion portion formed and applied with pressure on the compression pocket side, and an annular groove formed in an annular shape having a predetermined width and depth on the outer peripheral surface of the body portion. 2. A vacuum preventing device for a scroll compressor according to 1.   8. The scroll compressor vacuum prevention device according to claim 7, wherein the slider is inserted into the connection channel such that the step protrusion is positioned on the center side of the fixed scroll.   The scroll compressor vacuum prevention device according to claim 7, wherein a plurality of the annular grooves are formed in the body portion.   The elastic support means includes a spring that is inserted into the connection channel and elastically supports the slider, a spring support tube that has a through hole formed therein and is press-fitted into the connection channel to support the spring, The vacuum preventer for a scroll compressor according to claim 1, comprising:

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