JP2008280862A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor capable of shortening a release time of a lead valve. <P>SOLUTION: The compressor 10 is provided with a discharge hole 43 that communicates a cylinder chamber 22 and a first discharge chamber 13A with each other, a lead valve 50 (discharge valve) that opens and closes the discharge hole 43, and a valve support 51 that restricts an opening limit position of the lead valve 50. The valve support 51 has an opening portion 60 through which a back face of the lead valve positioned at the open limit position is partially exposed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor, and more particularly to a valve support for the compressor.

The conventional compressor has a suction hole that communicates the suction chamber and the cylinder chamber, a discharge hole that communicates the cylinder chamber and the discharge chamber, a reed valve that opens and closes the discharge hole, and a valve support that regulates the open limit position of the reed valve. (See, for example, Patent Document 1). In this compressor, as the volume of the cylinder chamber changes, fluid is sucked from the suction chamber through the suction hole into the cylinder chamber and compressed in the cylinder chamber. Then, the fluid compressed in the cylinder chamber passes through the discharge hole, pushes up the reed valve, and is discharged into the discharge chamber. At that time, the valve support is installed so that the reed valve cannot be pushed up beyond a certain height.
JP 2004-308428 A

  However, in the above-described conventional compressor, the reed valve sticks to the valve support, and the reed valve is open for a long time. For this reason, the fluid compressed and delivered to the discharge chamber from the discharge hole of the unoccupied reed valve returns to the inside of the cylinder chamber and is recompressed in the cylinder chamber, reducing the compression efficiency. I will invite you.

  Accordingly, an object of the present invention is to provide a compressor in which the reed valve opening time is shortened and the compression efficiency is improved.

The invention according to claim 1 is a compressor that sucks, compresses and discharges fluid,
A reed valve that opens and closes a discharge hole that communicates between the cylinder chamber and the discharge chamber; and a valve support that regulates an open limit position of the reed valve. The valve support has a back surface of the reed valve at the open limit position. An opening for partially exposing is provided.

  A second aspect of the present invention is the compressor according to the first aspect, characterized in that the opening portion is provided on the tip side from the center portion in the longitudinal direction of the valve support.

  A third aspect of the present invention is the compressor according to the second aspect, wherein the open portion is provided in a cutout shape at a longitudinal end of the valve support.

  Invention of Claim 4 is the compressor in any one of Claims 1-3, Comprising: From the seat surface of the said reed valve in the vicinity of the front-end | tip of the said valve support, toward the opening direction of the said opening part substantially A guide surface that rises up is provided.

  According to the first aspect of the present invention, the fluid that flows backward from the discharge chamber to the cylinder chamber through the discharge hole after the discharge process is applied to the reed valve through the opening of the valve support. It can be shortened.

  According to the second aspect of the present invention, the reed valve is closed with a weaker force than that provided on the rear side by providing the position of the opening portion on the tip side from the central portion in the longitudinal direction of the valve support. Can do.

  According to invention of Claim 3, the effect | action and effect of Claim 2 can be exhibited to the maximum.

  According to the fourth aspect of the present invention, the fluid that flows backward from the discharge chamber to the cylinder chamber through the discharge hole after the discharge step is completed is guided by the guide surface toward the opening direction of the opening portion. The action and effect of 3 are further improved.

  First, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic diagram of a refrigeration cycle to which the compressor of this embodiment is applied.

  The compressor 10 of this embodiment is applied to the refrigeration cycle of an automobile air conditioner. As shown in FIG. 1, the refrigeration cycle 1 is configured by connecting a compressor 10, a condenser 2, an expansion valve 3, an evaporator 4 and a gas-liquid separator 5 in this order. The pressurized refrigerant compressed by the compressor 10 is After being sent to 2 and cooled, the expansion valve 3 adiabatically expands to lower the temperature, and this low-temperature refrigerant passes through the evaporator 4 to exchange heat with the conditioned air and then returns to the compressor 10. The refrigerant returned from the evaporator 4 to the compressor 10 is gas-liquid separated by the gas-liquid separator 5 in the middle, and only the gas-phase refrigerant returns to the compressor 10.

  Next, the compressor of this embodiment will be described. FIG. 2 is a cross-sectional view of the compressor according to the present embodiment, and FIG. 3 is a cross-sectional view taken along line EE of FIG.

  The compressor 10 sucks, compresses and discharges a refrigerant as a fluid. As shown in FIG. 2, the compressor 10 is configured such that a compressor main body 20 and an electric motor 30 as a drive unit of the compressor main body 20 are arranged in a housing 11.

  The compressor housing 11 is formed by connecting a container-shaped first housing 11A and a lid-shaped second housing 11B with bolts or the like, and has a sealed box shape.

  The space in the housing 11 is partitioned by the compressor body 20, and the suction chamber 12 is provided on the right side in FIG. 2 with the compressor body 20 in between, while the discharge chamber 13B is provided on the left side in FIG. .

  The compressor body 20 of the present embodiment is configured as a vane type rotary compressor having vanes. The compressor body 20 includes a cylinder block 21 having a cylinder chamber 22 formed in a non-circular shape with a smooth inner periphery, a compressor rotor 23 housed rotatably in the cylinder chamber 22, and an outer periphery of the compressor rotor 23. A vane 24 (see FIG. 3), which is arranged so as to be able to protrude and retract at a predetermined interval and whose tip is in sliding contact with the inner periphery of the cylinder chamber 22, is joined to both axial sides of the cylinder block 21 and closes both axial sides of the cylinder chamber 22. In addition, a side block 25 and a side block 26 with which the compressor rotor 23 comes into sliding contact are provided.

  The side block 26 is provided with a suction hole 41 for communicating the suction chamber 12 and the cylinder chamber 22, and the cylinder block 21 is a discharge hole extending in the radial direction for communicating the cylinder chamber 22 and the first discharge chamber 13 </ b> A. 43 (see FIG. 3) is provided, and the side block 25 is provided with a communication hole 45 extending in the axial direction that communicates the first discharge chamber 13A and the second discharge chamber 13B. Note that an L-shaped notch is provided on the outer periphery of the cylinder block 21, and this L-shaped notch forms the first discharge chamber 13 </ b> A.

  When the compressor rotor 23 rotates, the volume in the circumferential direction of the cylinder chamber 22 changes as the vane 24 moves in and out, so that the low-pressure refrigerant sucked into the cylinder chamber 22 from the suction hole 41 is compressed in the cylinder chamber 22. The compressed high-pressure refrigerant is discharged from the cylinder chamber 22 to the first discharge chamber 13A through the discharge hole 43, and flows to the second discharge chamber 13B through the communication hole 45. The high-pressure refrigerant discharged into the second discharge chamber 13B is discharged from the discharge port 15 to the outside (outlet piping).

  Next, a discharge valve mechanism that opens and closes the discharge hole 43 will be described with reference to FIGS.

  The discharge valve mechanism includes a reed valve 50 that opens and closes the discharge hole 43 (discharge valve), and a valve support 51 that supports the reed valve 50.

  As shown in FIG. 8, a spacer 52, a reed valve 50, and a valve support 51 are stacked on the seating surface 54 of the cylinder block 21, and bolts 53 serving as fastening means are provided at the longitudinal base ends of the reed valve 50 and the valve support 51. It is fixed with. The reed valve 50 has a proximal end side 50a separated from the seating surface 54 by a spacer 52, curved toward the seating surface side at a longitudinal intermediate portion 50b, and a longitudinal distal end portion 50c blocking the discharge hole 43. .

  At the end of the compression stroke, the high-pressure refrigerant compressed in the cylinder chamber 22 pushes up the reed valve 50 blocking the discharge hole 43 and is discharged into the first discharge chamber 13A. In addition, in order to prevent the reed valve 50 from opening too much, a valve support 51 is provided on the back side of the reed valve 50, which receives the back side of the reed valve 50 and prevents the reed valve 50 from being pushed up beyond a certain height.

  At this time, when the rotational speed of the comprotor 23 is fast and the push-up amount of the reed valve 50 is large, the reed valve 50 sticks to the valve support 51. Therefore, in order to prevent this, the tip of the valve support 51 is notched. An opening 60 is provided (see FIG. 7). The opening 60 is U-shaped.

Further, a guide surface 55 is provided in the vicinity of the valve support 51 so as to rise from the seat surface 54 of the reed valve 50 toward the opening direction of the opening 60 (see the arrow in FIG. 9). (See Figs. 8 and 9)
The effects of this embodiment are listed below.

  First, the high-pressure refrigerant compressed in the cylinder chamber 22 pushes up the reed valve 50 blocking the discharge hole 43 and is discharged into the first discharge chamber 13A. Since the opening 60 is provided, sticking of the reed valve 50 can be prevented. Therefore, the opening time of the reed valve 50 can be shortened, and the refrigerant that flows backward from the discharge chamber 13 </ b> A into the cylinder chamber 22 can be reduced. As a result, recompression in the cylinder chamber 22 can be prevented, and compression efficiency can be improved.

  Secondly, in this embodiment, since the opening 60 is provided on the tip side from the center in the longitudinal direction of the valve support 51, the reed valve 50 is pushed back to the seat surface 54 side with a relatively weak force, The discharge hole 43 can be closed.

  Thirdly, in the present embodiment, since the opening 60 is provided at the tip of the valve support 51, the second effect can be obtained more reliably.

  Fourth, since a guide surface 55 is provided in the vicinity of the valve support 51 from the seat surface 54 of the reed valve 50 so as to rise substantially in the opening direction of the opening 60, the reverse flow flows from the discharge chamber 13A toward the discharge hole 43. Since the refrigerant can be guided by the guide surface 55 in the opening direction of the opening 60, the above-described effects can be exhibited to the maximum.

  It should be noted that the present invention should not be construed as limited to the above-described embodiments. For example, in the above-described embodiment, the notch-shaped opening 60 is provided at the tip of the valve support 51, but the opening 60B may have a hole shape like the valve support 51B shown in FIG. In addition, as in the valve support 51C shown in FIG. 11, the opening 60C may be formed substantially along the outer peripheral edge of the valve support 51C. Various modifications can be made within the scope of the technical idea of the present invention.

It is a figure which shows roughly the refrigerating cycle in which the electric compressor in one Embodiment of this invention is used. It is sectional drawing of the same electric compressor. It is EE sectional drawing of FIG. It is a side view of the discharge valve mechanism seen from the arrow F direction in FIG. It is a side view which shows the seat surface of the cylinder block seen from the arrow F direction in FIG. It is a side view of the reed valve of the discharge valve mechanism. It is a side view of the valve support of the same discharge valve mechanism. The principal part expanded sectional view showing the discharge hole vicinity of a cylinder block is shown, and it is at the time of closing of a reed valve. The principal part expanded sectional view showing the discharge hole vicinity of a cylinder block is shown, and it is at the time of opening and closing of a reed valve. It is a side view which shows the 1st modification of a valve support. It is a side view which shows the 2nd modification of a valve support.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle 10 ... Electric compressor 11 ... Housing 12 ... Suction chamber 13A ... 1st discharge chamber (discharge chamber)
13B ... Second discharge chamber (discharge chamber)
14 ... suction port 15 ... discharge port 20 ... compressor body 21 ... cylinder block 22 ... cylinder chamber 23 ... compressor rotor 24 ... vane 25 ... discharge chamber side block 26 ... Suction chamber side block 30 ... Electric motor 41 ... Suction hole 43 ... Discharge hole 45 ... Communication hole 50 ... Reed valve 51 ... Valve support 52 ... Spacer 53 ... Bolt 54 ... Seating surface 55 ... Guide surface 60 ... Opening

Claims (4)

A compressor (10) for sucking, compressing and discharging fluid,
A reed valve (50) for opening and closing a discharge hole (43) communicating with the cylinder chamber (12) and the discharge chamber (13A, 13B), and a valve support (51) for regulating the open limit position of the reed valve (50). The valve support (51) is provided with an opening (60, 60B, 60C) that partially exposes the back surface of the reed valve (50) in the open limit position ( 10). A compressor (10) according to claim 1, comprising:
The compressor (10), wherein the opening (60, 60B) is provided on the front end side of the central portion in the longitudinal direction of the valve support (51, 51B). A compressor (10) according to claim 2, comprising:
The compressor (10), wherein the opening (60) is provided in a cutout shape at a longitudinal end of the valve support (51). A compressor (10) according to any of claims 1-3,
A guide surface that rises in the vicinity of the tip of the valve support (51, 51B, 51C) from the seat surface (54) of the reed valve (50) substantially in the opening direction of the opening (60, 60B, 60C). 55). A compressor (10) characterized in that it is provided.

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