JP2714075B2 - Discharge valve device for scroll compressor - Google Patents

Description

The present invention relates to an improvement in a discharge valve device of a scroll compressor.

(B) Conventional technology A conventional discharge valve device of a compressor is configured as shown in, for example, Japanese Utility Model Publication No. 56-4873. Here, a conventional example will be described with reference to this publication. In FIG. 5 to FIG. 7, reference numeral 50 denotes a closed container, in which a motor unit 51 and a compressor unit 52 are incorporated.

The compressor section 52 supports one end of a plurality of piston rods 56 on a crankshaft section 55 of a main shaft 54 in a crankcase 53, and attaches a piston 57 provided at the other end of the piston rod to the crankcase 53. It is located in the formed cylinder 58. A cylinder head 60 is provided at the opening of the cylinder 58 via a valve plate 59, and a suction chamber 61 and a discharge chamber 62 are formed in the cylinder head. This suction chamber is a communication hole formed in the cylinder head 60.
It communicates with the inside of the sealed container 50 via 63 and also communicates with the inside of the cylinder 58 via a suction hole 64 formed in the valve plate 59. The discharge chamber 62 communicates with the inside of the cylinder 58 via a discharge hole 65 formed in the valve plate 59, and also communicates with a discharge port 67 of the sealed container 50 via a discharge pipe 66. Further, in the valve plate 59, a suction valve 68 is provided on the cylinder 58 side of the suction hole 64, while a discharge valve 69 and a stopper 70 are provided on the cylinder head 60 side of the discharge hole 65.

The valve plate 59 is formed of a square metal plate. The valve plate is a molded product formed by sintering using metal particles such as iron powder as a raw material, and has a sloped position that becomes deeper from one side to the other side at a position where the discharge valve 69 is mounted. A rectangular depression 72 having a bottom surface 71 is formed simultaneously with the molding of the valve plate 59 by a sintering method. A discharge hole 65 is opened in a thin portion of the inclined bottom surface 71, and a discharge valve 69 is formed in the thick portion.
The base is supported.

In the discharge valve device of the compressor having this structure, the bottom 72 is inclined so that the recess 72 for mounting the discharge valve 69 is provided deeper in the direction in which the discharge hole 65 is provided, and the discharge hole 65 is shortened to reduce the flow resistance. Thus, the pressure loss is reduced, and the refrigerating capacity is improved.

(C) Problems to be Solved by the Invention However, when the valve plate 59 is operated, the discharge chamber 62 in the cylinder head 60 has a high discharge pressure, and the inside of the cylinder 58 changes from a low pressure to a high pressure.
Since the pressure difference acting on 71 changes, the plate thickness of the recess 72 on the discharge hole 65 side cannot be made too thin in consideration of the case where the pressure difference during the suction stroke becomes maximum.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a discharge valve device for a scroll compressor in which the thickness of a portion around a discharge hole to which a discharge valve is attached can be reduced.

(D) Means for Solving the Problems The present invention relates to a fixed scroll in which a spiral wrap is erected on a steel plate, and an orbiting scroll in which a spiral wrap is erected on a head plate facing the fixed scroll. A plurality of compression spaces formed in step (a) are gradually reduced from the outside toward the inside to perform compression, and a discharge hole is provided in a fixed scroll end plate so as to communicate with a central compression space. The discharge valve that opens and closes is mounted on the head plate from the center to the outside, and the discharge valve is disposed in a valve storage recess provided on the head plate of the fixed scroll, and the contact surface of the recess with the discharge valve is formed in the discharge hole. The shield plate is inclined so that the side becomes thin, and a shield plate is attached to the end plate to partially cover the discharge hole side of the recess for storing the valve.

(E) Action The present invention is configured as described above, so that the contact surface of the concave portion for valve storage provided on the end plate of the fixed scroll, which is in contact with the discharge valve, is inclined so that the discharge hole side becomes thin, and the compression space is formed. The thickness of the contact surface on the side where the pressure difference between the inside and the discharge chamber behind the end plate is large is increased, the strength of the contact surface of the recess for storing the valve and the passage resistance of the discharge hole are reduced, and the refrigerating capacity is improved In this case, the opening / closing noise of the discharge valve is attenuated by the shielding plate.

(F) Embodiment The present invention will be described below with reference to the embodiment shown in FIGS.

Reference numeral 1 denotes a closed container in which a scroll compressor unit 2 is provided on the upper side, and an electric motor unit 3 for driving the compressor unit is provided on the lower side.
Are stored respectively. Reference numeral 4 denotes a frame, in which a bearing 6 for supporting the rotary shaft 5 is provided at the center. The scroll compressor unit 2 includes a fixed scroll 7 and an orbiting scroll 8. The fixed scroll 7 has a disk-shaped end plate 9, an annular wall 10 protruding from one peripheral edge of the end plate, and an involute-like or an approximate curve standing upright on the end plate 9 surrounded by the annular wall. And a spiral wrap 11 composed of Fixed scroll 7
The end plate 9 is provided with a discharge hole 12 at the center. The fixed scroll 7 is fixed to the peripheral edge of the frame 4 with the projecting directions of the annular wall 10 and the wrap 11 facing downward. The orbiting scroll 8 has a disk-shaped end plate 13, an involute-shaped wrap 14 erected on one surface of the end plate, and a spiral wrap 14 formed of a curved line similar to the involute-shaped end plate 13.
And a pin portion 15 protruding from the center of the other surface. The orbiting scroll 8 has the wrap 14 projecting upward, and this wrap is the wrap of the fixed scroll 7.
A plurality of compression spaces 16 are formed inside so as to face and mesh with each other. Reference numeral 17 denotes a boss hole provided at the tip of the rotary shaft 5 for inserting the pin portion 15 of the orbiting scroll 8, and the center of the boss hole is provided eccentric with the axis of the rotary shaft 5. Reference numeral 18 denotes an Oldham coupling that revolves on a circular orbit so that the orbiting scroll 8 does not apparently rotate with respect to the fixed scroll 7. A suction passage 19 for guiding a working fluid to the scroll compressor unit 2 is formed on the outer periphery of the frame 4. Reference numeral 20 denotes a suction pipe, which is opened in the closed casing 1 below the electric motor unit 3. Reference numeral 21 denotes a discharge pipe attached to the upper wall of the closed casing 1, and the discharge pipe is provided in an upper space 22 communicating with the discharge hole 12.

Reference numeral 23 denotes a discharge valve for opening and closing the discharge hole 12, and this discharge valve is mounted on the end plate 9 on the upper space 22 side from the center toward the outside. Numeral 24 is a recess for accommodating the discharge valve 23, and
The concave portion is provided with a contact surface 25 with which the discharge valve 23 contacts, which is inclined so that the discharge hole 12 side becomes thin. Reference numeral 26 denotes a shield plate, which is attached to the end plate 9 so as to partially cover the discharge hole 12 side of the recess 24 for storing a valve.

In the discharge valve device of the scroll compressor configured as described above, when the electric motor unit 3 is rotated, the rotational force is transmitted to the orbiting scroll 8 via the rotating shaft 5. That is, the orbiting scroll 8 is driven by the pin 15 inserted into the boss hole 17 of the rotating shaft 5 eccentrically with respect to the axis of the rotating shaft, and does not apparently rotate with respect to the fixed scroll 7 by the Oldham coupling 18. In a circular orbit. Then, the fixed scroll 7 and the orbiting scroll 8 reduce the compression space 16 formed by these scrolls from the outside toward the inside, and flow into the closed casing 1 from the suction pipe 20 to remove the electric motor section 3. The working fluid flowing through the suction passage 19 on the outer periphery of the through frame 4 is compressed. The compressed working fluid opens the discharge valve 23 from the discharge hole 12 of the end plate 9 of the fixed scroll 7, and is discharged from the discharge pipe 21 to the outside of the closed container 1 through the upper space 22.

Upper space facing the end plate 9 of the fixed scroll 7
The pressure difference between the discharge pressure of 22 and the plurality of compression spaces 16 is such that these compression spaces gradually increase in pressure from the outside toward the center, so that the center is smaller than the outside. For this reason, the center portion of the end plate 9 is hardly subjected to stress due to the pressure difference. The recess 24 for accommodating the discharge valve 23 has a contact surface with which the discharge valve contacts.
Even if the plate 25 is inclined so that the plate thickness on the side of the discharge hole 12 becomes thin, it is not affected by the stress due to the pressure difference, so that the passage resistance of the discharge hole can be reduced.

Further, the discharge valve 23 is disposed in the concave portion 24 for storing the valve, and the discharge hole 12 side of the concave portion is partially covered with the shielding plate 26,
Noise caused by opening and closing is attenuated. Moreover, since the discharge valve 23 is attached to the inclined contact surface 25 such that the open side is lower than the fixed side, the distance between the discharge valve 23 and the shielding plate 26 on the side where the displacement is large from this contact surface can be increased. I have to. Thus, the discharge valve 23 can be prevented from hitting the shielding plate 26.

According to the present invention, the discharge valve 23 is disposed in the valve housing recess 24 in which the contact surface 25 provided on the end plate 9 is inclined, and the discharge hole 12 side of the recess is partially covered with the shielding plate 26. Discharge hole
Even if the refrigerating capacity is improved by reducing the passage resistance of the passage 12, the strength of the contact surface 25 to which the discharge valve 23 is attached is not impaired, and the noise accompanying opening and closing of the discharge valve 23 is reduced by the recess 24 and the shielding plate 26. And can be attenuated.

(G) Effect of the Invention The discharge valve device of the scroll compressor according to the present invention has a fixed scroll in which a spiral wrap is erected on a head plate, and a spiral wrap is erected on a head plate facing the fixed scroll. A plurality of compression spaces formed by the orbiting scroll are gradually reduced from the outside to the inside to perform compression, and a discharge hole is provided in the end plate of the fixed scroll so as to communicate with the center compression space. A discharge valve for opening and closing the discharge hole is mounted on a head plate from the center toward the outside, and the discharge valve is arranged in a valve storage recess provided in the head plate of the fixed scroll. Since the surface is inclined so that the discharge hole side becomes thin, and a shield plate that partially covers the discharge hole side of the valve housing concave portion is attached to the end plate, the valve housing provided on the end plate of the fixed scroll is provided. Recess contact By inclining the surface so that the plate thickness on the discharge hole side becomes thin, a portion where the pressure difference between the pressure of the discharge chamber acting as the back pressure of the discharge valve on the contact surface of the concave portion and the pressure of each compression space is small. By reducing the pressure resistance at the discharge hole by reducing the passage resistance by reducing the passage resistance by making the effect of the stress due to the pressure difference It can be made to have no effect. In addition, the discharge valve is arranged in the concave portion, and the discharge hole side of the concave portion is partially covered with the shielding plate, so that noise accompanying opening and closing can be attenuated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention, FIG. 2 is a sectional view showing a state where a wrap of a fixed scroll and an orbiting scroll are engaged, and FIG. FIG. 4 is a sectional view taken along line AA of FIG. 3, FIG. 5 is a partial sectional view of a conventional reciprocating compressor, and FIG. 6 is a sectional view of FIG. FIG. 7 is an enlarged sectional view of a portion B, and FIG. 7 is a perspective view of the valve plate. 1 ... closed container, 2 ... scroll compressor section, 7 ... fixed scroll, 8 ... swinging scroll, 9, 13 ... end plate,
11,14… wrap, 12… discharge hole, 16… compression space, 23
... discharge valve, 24 ... recess for valve storage, 25 ... contact surface, 26
……Shield.

Claims (1)

(57) [Claims] 1. A scroll compressor unit is housed in a closed container, and the compressor unit is formed by a fixed scroll having a spiral wrap standing on a mirror plate and a spiral plate which meshes with the fixed scroll. A plurality of compression spaces formed by the fixed scroll and the oscillating scroll. Is gradually reduced from the outside to the inside to perform compression, and a discharge hole is provided in the end plate of the fixed scroll so as to communicate with the central compression space, and a discharge valve for opening and closing this discharge hole is provided from the center to the outside. In the discharge valve device of the scroll compressor mounted on the head plate toward the end, the discharge valve is disposed in a valve storage recess provided in the head plate of the fixed scroll. A discharge valve device for a scroll compressor, wherein a contact surface is inclined so that a discharge hole side becomes thin, and a shield plate that partially covers the discharge hole side of a valve housing concave portion is attached to the end plate. .