JP3279223B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a scroll compressor provided with a suction check valve for suppressing reverse rotation of a movable scroll.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional scroll compressor having a suction check valve. The scroll compressor shown in FIG. 4 is disclosed in Japanese Patent Publication No. 1-334312. The scroll compressor shown in FIG. 4 will be described below, but for convenience of description, the names of the respective parts have been appropriately changed so as to correspond to the present invention.

Referring to FIG. 4, in a closed casing 1, a compression element 4 composed of a fixed scroll 2 and a movable scroll 3, a housing 6a for holding the compression element 4, and a movable scroll 3 are turned. A crankshaft 11 for rotating the crankshaft 11 and a motor 10 for rotating the crankshaft 11 are incorporated. In addition, a suction pipe 16 for feeding gas refrigerant into a compression chamber 27 formed by the fixed scroll 2 and the movable scroll 3 is provided in the closed casing 1.
And an external discharge pipe for discharging the gas refrigerant that has been compressed in the compression chamber 27 and discharged into the closed casing 1 through the discharge port 14 to the outside.

[0006] One end of the suction pipe 16 is inserted into a predetermined position of the fixed scroll 2, and a suction hole 20 is provided immediately below the fixed scroll 2. A suction check valve 21 urged by a spring 22 is provided in the suction hole 20. By installing such a suction check valve 21, the reverse flow of the lubricating oil and the movable scroll 3
Can be suppressed.

[0005] The movable scroll 3 is provided with a boss portion 3a, and at one end of the crankshaft 11, an eccentric portion 11a is provided. This eccentric part 11a is inserted inside the boss part 3a. The motor 10 includes a rotor 9 and a stator 8,
The crankshaft 11 is fitted to the rotor 9. Thereby,
The crankshaft 11 can be rotated by the motor 10, and the movable scroll 3 can be turned. An oil reservoir 15 is provided at the bottom of the closed casing 1.
Is provided.

Next, the structure near the installation of the suction check valve 21 will be described in more detail with reference to FIG. FIG.
5 is a view showing the vicinity of a suction check valve 21 in FIG.

Referring to FIG. 5, suction pipe 16 is connected to fixed scroll 2 via O-ring 23. And
The end face 24 of the suction pipe 16 is deeper than the tooth bottom 25. During operation of the scroll compressor, the suction check valve 21 moves downward, and gas refrigerant is sent into the compression chamber 27 as shown by an arrow in FIG. When the operation is stopped, the suction check valve 21 is brought into contact with the end face 24 to prevent the backflow of the lubricating oil or the like.

However, the conventional scroll compressor shown in FIGS. 4 and 5 has the following problems. When the operation is stopped, the suction check valve 21 moves upward and abuts against the end face 24 of the suction pipe 16. However, since the end face 24 is deeper than the tooth bottom face 25, the tooth bottom face 25 and the suction check valve There is a problem in that a part of the contact 21 interferes with the upward movement of the suction check valve 21.

FIG. 6 shows an improved example designed to solve the above problem. Figure 6 shows the Japanese Patent Publication No. 2-14.
It is a figure which shows the vicinity of the suction check valve 21 of the scroll compressor disclosed by Unexamined-Japanese-Patent No. 559.

As shown in FIG. 6, a counterbore 26 is provided in the vicinity of the end face 24 in this improved example. By providing such a counterbore 26, the suction check valve 21 can be smoothly moved to the end face 24. Further, in the case shown in FIG. 5, the width of the flow path of the gas refrigerant is H-H1, but in FIG.
In the improved example shown in FIG. 2, the width of the flow path of the gas refrigerant is increased by the size of the counterbore 26. Therefore, the pressure loss at the time of sending the gas refrigerant into the compression chamber 27 can be reduced as compared with the case shown in FIG.

[0011]

However, the above-described improved example also has the following problem.

By forming the counterbore 26, the flow area of the gas refrigerant can be somewhat increased and the pressure loss at the time of suction of the gas refrigerant can be reduced to some extent, but the flow path of the gas refrigerant is defined. As described above, since the wall surface of the fixed scroll 2 still exists, the pressure loss due to the influence of the wall surface cannot be eliminated. Also, in view of the minimum required thickness of the end plate 2a of the fixed scroll 2, the depth of the spot facing 26 cannot be made too large. Therefore, even if the counterbore 26 is provided, it is difficult to secure a flow path having the same width as the tooth height H of the fixed scroll 2, and it can be said that the degree of pressure loss that can be reduced is small.

As described above, even in the above-mentioned improved example, it was difficult to sufficiently reduce the pressure loss when the gas refrigerant was sucked. The present invention has been made to solve such a problem. An object of the present invention is to provide a scroll compressor capable of effectively reducing a pressure loss when a gas refrigerant is sucked into the compression chamber 27.

[0014]

A scroll compressor according to a first aspect of the present invention includes a closed casing, a fixed scroll, a movable scroll, a suction pipe, and a suction check valve. The fixed scroll has a suction hole that is incorporated in a closed casing and into which gas refrigerant before compression is fed. The movable scroll forms a compression chamber for compressing the gas refrigerant with the fixed scroll. The suction pipe is for supplying a gas refrigerant to the suction hole. The suction check valve suppresses reverse rotation of the movable scroll by opening and closing the suction pipe. An auxiliary suction hole is provided around the suction hole to penetrate the fixed scroll and communicate the compression chamber and the suction hole .

A scroll compressor according to a second aspect of the present invention includes a closed casing, a fixed scroll, a movable scroll, a suction pipe, and a suction check valve. The fixed scroll has a suction hole that is incorporated in a closed casing and into which gas refrigerant before compression is fed. The movable scroll forms a compression chamber for compressing the gas refrigerant with the fixed scroll. The suction pipe is for supplying a gas refrigerant to the suction hole. The suction check valve suppresses reverse rotation of the movable scroll by opening and closing the suction pipe. And
An auxiliary suction hole is provided around the suction hole to penetrate the end plate of the fixed scroll.

A scroll compressor according to a third aspect of the present invention includes a closed casing, a fixed scroll, a movable scroll, a suction pipe, and a suction check valve. The fixed scroll is incorporated in a closed casing, and has a suction hole into which gas refrigerant before compression is fed and a spiral groove. The movable scroll forms a compression chamber for compressing the gas refrigerant with the fixed scroll. The suction pipe is for supplying a gas refrigerant to the suction hole. The suction check valve suppresses reverse rotation of the movable scroll by opening and closing the suction pipe. It has a contour that intersects the contour of the suction hole at two points, the interval between the two points is smaller than the diameter of the suction hole,
An auxiliary suction hole is provided at the end of the spiral groove and extends through the end plate of the fixed scroll.

[0017] In the scroll compressor according to the fourth aspect,
The fixed scroll is held in a closed casing by a housing, and the space in the closed casing is partitioned into a low-pressure chamber and a high-pressure chamber by the housing, and the suction hole communicates with the low-pressure chamber by an auxiliary suction hole.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a scroll compressor according to one embodiment of the present invention. In addition, for convenience of illustration, hatching is omitted in some parts.

Referring to FIG. 1, the scroll compressor according to the present invention includes a closed casing 1, in which a compression element 4, an upper housing 6, a crankshaft 11, a motor 10, , The lower housing 7 are assembled.

The compression element 4 is composed of a fixed scroll 2 and a movable scroll 3, and a gas refrigerant is sent from the outside through a suction pipe 16 into a compression chamber 27 formed between the fixed scroll 2 and the movable scroll 3. It is. The movable scroll 3 has a boss 3a. The eccentric part 11a of the crankshaft 11 is inserted inside the boss part 3a. A slide bush 18 is inserted between the eccentric portion 11a and the boss 3a.

The crankshaft 11 is held by the upper housing 6 via an upper bearing 12a, for example, a rolling bearing. The crankshaft 11 is also held by the lower housing 7 via a lower bearing 12b. This crankshaft 11 is fitted into the rotor 9 of the motor 10. Rotor 9
Is around the stator 8. The space inside the closed casing 1 is changed by the upper housing 6 to the high pressure chamber 1.
3 and a low-pressure chamber 5. In addition, closed casing 1
An oil reservoir 15 is provided at the bottom of the oil reservoir.

A gas refrigerant is sent through the suction pipe 16 into the scroll compressor having the above configuration.
This gas refrigerant is sent into the compression chamber 27 and is compressed in the compression chamber 27. Then, it is fed into a discharge gas passage (not shown) formed in the crankshaft 11 through a discharge port 14 provided in the movable scroll 3. The compressed gas refrigerant thus sent into the crankshaft 11 is discharged into the closed casing 1 from a discharge port (not shown) provided in the crankshaft 11, and is discharged into an external discharge pipe (not shown). Through the scroll compressor.

Next, the features of the present invention will be described in detail with reference to FIGS. FIG. 2 is a partial plan view of the fixed scroll 2 according to the present invention, and FIG. 3 is an enlarged view of a cross-sectional structure along the line III-III in FIG. In FIG. 3, the illustration of the spring provided immediately below the suction check valve 21 is omitted.

As shown in FIG. 1, one end of the suction pipe 16 is fitted into the fixed scroll 2. Immediately below the connection between the suction pipe 16 and the fixed scroll 2, as shown in FIG. A suction hole 20 into which the gas refrigerant is sent through the suction pipe 16 is provided. As shown in FIG. 2, an auxiliary suction hole 19 is provided so as to partially overlap with the suction hole 20. The contour of the auxiliary suction hole 19 intersects the contour of the suction hole 20 at two points, and the interval D between the two points is smaller than the diameter of the suction hole 20. This makes it possible to prevent the suction check valve 21 from falling off. In addition, the auxiliary suction hole 1
9 is a winding end portion 2 of the spiral groove 2b of the fixed scroll 2.
Open at b1. Further, as shown in FIG. 3, the auxiliary suction hole 19 is provided through the end plate 2a of the fixed scroll 2, and the auxiliary suction hole 19 connects the suction hole 20 and the low-pressure chamber 5. The auxiliary suction hole 19 may be provided not only through the end plate 2a of the fixed scroll 2 but also entirely through the fixed scroll 2 in the axial direction (vertical direction in FIG. 3).

The gas refrigerant before compression passes through the suction pipe 16 and the suction hole 20 according to the arrow in FIG.
Sent inside. At this time, by providing the auxiliary suction hole 19, it is possible to eliminate the influence of the wall surface of the fixed scroll 2 on the gas refrigerant immediately below the auxiliary suction hole 19. This makes it possible to effectively reduce the pressure loss at the time of suction of the gas refrigerant, as compared with the case of the conventional example shown in FIG. 5 or FIG. Further, since the auxiliary suction hole 19 is provided so as to penetrate the end plate 2a, the flow having the same width as the spiral tooth height H of the fixed scroll 2 is provided as compared with the case where the counterbore 26 shown in FIG. It is possible to secure a road. This can also contribute to a reduction in pressure loss when the gas refrigerant is sucked. From the above,
According to the scroll compressor in the present embodiment, FIG.
It is possible to more effectively reduce the pressure loss when sucking the gas refrigerant than in the case of the conventional example shown in FIG.

In the above-described embodiment, the case where the suction check valve 21 is provided on the fixed scroll 2 has been described, but the suction check valve 21 may be provided in the suction pipe 16. In this case, there is no need to provide a spring or a spring seat directly below the suction hole 20, and the pressure loss at the time of sucking the gas refrigerant can be reduced more effectively. In the above-described embodiment shown in FIGS.
Is connected to the fixed scroll 2, but the suction pipe 16 and the fixed scroll 2 may be separated from each other.
In this case, it is preferable to install the suction check valve 21 in the suction pipe 16. Further, a plurality of auxiliary suction holes 19 may be provided. Further, the auxiliary suction holes 19 may be formed at the time of forming a material (forged product, casting) before processing the fixed scroll 2.

Although the embodiment of the present invention has been described above, the embodiment disclosed this time is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0028]

In the scroll compressor according to the first aspect of the present invention, an auxiliary suction hole is provided around the suction hole provided in the fixed scroll so as to penetrate the fixed scroll. As described above, since the auxiliary suction hole is provided so as to penetrate the fixed scroll, it is possible to eliminate the influence of the wall surface of the fixed scroll on the gas refrigerant passing immediately below the auxiliary suction hole. As a result, it is possible to further reduce the pressure loss at the time of suction of the gas refrigerant as compared with the case of the conventional example shown in FIG. Further, since the auxiliary suction hole penetrates through the fixed scroll, the flow area of the gas refrigerant immediately before the compression chamber is increased as compared with the case where the counterbore 26 is formed as in the conventional example shown in FIG. It becomes possible. This can also contribute to a reduction in pressure loss at the time of suction of the gas refrigerant. As described above, according to the present invention, it is possible to more effectively reduce the pressure loss at the time of suction of the gas refrigerant than the conventional example. Thereby, the volume efficiency can be improved, and the efficiency of the scroll compressor can be improved. Further, the present invention can be applied to scroll compressors formed by spirals of various sizes only by adjusting the planar position of the auxiliary suction hole. This makes it possible to use a common casing top (corresponding to the upper end of the closed casing 1 in FIG. 1),
In addition, an effect of improving the assemblability due to facilitating automation in assembling can be obtained.

[0029] In the scroll compressor according to the second aspect,
An auxiliary suction hole is provided to penetrate the end plate of the fixed scroll. In this case, the same effect as in the above case can be obtained.

[0030] In the scroll compressor according to the third aspect,
The outline of the suction hole and the outline of the auxiliary suction hole intersect at two points, and the interval between the two points is set to be smaller than the diameter of the suction hole. Thereby, in addition to the above effects, it is possible to prevent the suction check valve from falling off.

[0031] In the scroll compressor according to the fourth aspect,
The space in the closed casing is partitioned by the housing into a high-pressure chamber and a low-pressure chamber, and the suction port and the low-pressure chamber communicate with each other through the auxiliary suction port. By providing the high-pressure chamber and the low-pressure chamber in the closed casing in this way, an auxiliary suction hole penetrating the fixed scroll can be formed, and the various effects described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a scroll compressor according to one embodiment of the present invention.

FIG. 2 is a partial plan view of the fixed scroll according to the present invention.

FIG. 3 is an enlarged view of a sectional structure taken along line III-III in FIG. 2;

FIG. 4 is a cross-sectional view illustrating an example of a conventional scroll compressor.

5 is a diagram showing a structure near a suction check valve in the scroll compressor shown in FIG.

FIG. 6 is a view showing a structure in the vicinity of a suction check valve in an improved example of the conventional scroll compressor shown in FIGS. 4 and 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed casing 2 Fixed scroll 2a End plate 2b Spiral groove 2b1 End of winding 3 Movable scroll 5 Low pressure chamber 6 Upper housing 7 Lower housing 16 Suction pipe 19 Auxiliary suction hole 20 Suction hole 21 Suction check valve

────────────────────────────────────────────────── (5) References JP-A-4-350376 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (4)

(57) [Claims] 1. A fixed scroll (2) having a closed casing (1), a suction hole (20) incorporated in the closed casing (1), and into which a gas refrigerant before compression is fed, and the fixed scroll (2). (3) movable scroll (3) forming a compression chamber (27) for compressing the gas refrigerant
A suction pipe (16) for supplying the gaseous refrigerant to the suction hole (20); and a suction check which suppresses reverse rotation of the movable scroll (3) by opening and closing the suction pipe (16). Valve (21)
The fixed scroll (2) around the suction hole (20).
Through the compression chamber (27) and the suction hole (20).
A scroll compressor characterized by having an auxiliary suction hole (19) communicating with the scroll compressor. 2. A fixed scroll (2) having a closed casing (1), a suction hole (20) incorporated in the closed casing (1), and into which a gas refrigerant before compression is fed, and the fixed scroll (2). (3) movable scroll (3) forming a compression chamber (27) for compressing the gas refrigerant
A suction pipe (16) for supplying the gaseous refrigerant to the suction hole (20); and a suction check which suppresses reverse rotation of the movable scroll (3) by opening and closing the suction pipe (16). Valve (21)
The fixed scroll (2) around the suction hole (20).
A scroll compressor characterized in that an auxiliary suction hole (19) penetrating through the end plate (2a) is provided. 3. A closed casing (1), a suction hole (20) incorporated in the closed casing (1), into which a gas refrigerant before compression is fed, and a spiral groove (2b).
A movable scroll (3) forming a compression chamber (27) for compressing the gas refrigerant between the fixed scroll (2) having the following structure and the fixed scroll (2).
A suction pipe (16) for supplying the gas refrigerant to the suction hole (20), and a suction check for opening and closing the suction pipe (16) to prevent the movable scroll (3) from reversing. A valve (21), having a contour intersecting the contour of the suction hole (20) at two points, wherein the interval (D) between the two points is smaller than the diameter of the suction hole (20), (2b)
b1), the end plate (2) of the fixed scroll (2).
A scroll compressor characterized by having an auxiliary suction hole (19) passing through a). 4. The fixed scroll (2) is held in the closed casing (1) by a housing (6), and the space in the closed casing (1) is reduced by the housing (6) to a low pressure chamber (5). The scroll compressor according to any one of claims 1 to 3, wherein the scroll compressor is partitioned into a high-pressure chamber (13) and the suction port (20) communicates with the low-pressure chamber (5) through the auxiliary suction port (19). .