JP3485767B2 - 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 mounted in, for example, an air conditioner / refrigerator, and more specifically, a plurality of scrolls formed by meshing a fixed scroll and an orbiting scroll. The present invention relates to a scroll compressor that discharges compressed gas compressed in a compression chamber to the outside of a closed container.

[0002]

2. Description of the Related Art A scroll type compressor 1A used in a refrigerating cycle such as an air conditioner has a structure shown in FIG. 6, for example. An electric element 2 and a scroll compression element 3 are provided inside a cylindrical closed container 1 whose both ends are closed.
And are built in. The electric element 2 is the closed container 1
4 fixed to the inner wall surface side of the
And a rotor 5 rotatably supported inside the rotor 5. A rotary shaft 6 is coupled to the rotor 5 in a penetrating state.
One end of the rotary shaft 6 is rotatably supported by a support frame 7 that constitutes a part of the scroll compression element 3. The other end of the rotary shaft 6 is projected from the rotor 5, and an oil supply unit 8 is connected to the tip of the rotor 5. An oil introduction pipe 9 is connected to the end of the oil supply section 8. The end of the oil introduction pipe 9 on the suction side is extended downward so as to be submerged in the lubricating oil b contained in the closed container 1. The lubricating oil b from the oil supply portion 8 is attached to the rotary shaft 6.
An oil passage 10 for sucking and supplying the oil is bored in the axial direction, and after the lubricating oil is supplied to each sliding portion such as the support frame 7 through the oil passage 10, it is recirculated. ing.

A pin portion (crank portion) of the rotary shaft 6 supported so as to penetrate the support frame 7 is provided such that its center is eccentric with the axis of the rotary shaft 6.
The pin 11 has a rocking scroll 12 connected to it. This swing scroll 1
2 is formed in a disc shape, and a boss hole portion 13 to which the pin portion 11 is connected is formed in the center portion of one side surface. A spiral wrap 14 is integrally formed on the other side surface of the oscillating scroll 12. A fixed scroll 15 is connected to the support frame 7. A fixed wrap 16 having a spiral shape is formed in the fixed scroll 15 at a portion facing the orbiting scroll 12, and a plurality of compression chambers 17 are formed between the fixed scroll 15 and the orbiting wrap 14. The refrigerant gas introduced from the outside of the closed container 1 to the outer peripheral portion of the scroll compression element 3 through the suction pipe 18 is located at a first suction port (not shown) of the scroll compression element 3 and at a position opposite to the first suction port. 1) A fixed scroll that is sucked from two positions of a second suction port (not shown) connected to a communication groove communicating with the suction port, is compressed in the compression chamber 17, and gradually moves to the center to reduce the volume. From the discharge port 19 provided at the center of the other side surface of the closed container 1
Lubricating oil discharged inside and entrained in this space is separated,
Pulsations are reduced.

The compressed gas discharged from the discharge port 19 into the closed container 1 is the fixed scroll 1 as indicated by the white arrow.
5 and a passage (not shown) provided in the support frame 7,
The lubricating oil in the refrigerant gas is further separated by the centrifugal force due to the rotation of the rotor 5 and the like toward the electric element 2, and the refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 20 to the outside of the closed container 1. The separated lubricating oil flows as shown by the black arrow, accumulates at the bottom of the closed container 1, and is circulated for use.

However, if the amounts of the refrigerants sucked from the first suction port and the second suction port (not shown) of the scroll compression element 3 are different, the suction efficiency is deteriorated and the pulsation is increased to cause noise. , There was a problem that reliability was reduced.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to make the amount of refrigerant sucked from the first suction port and the second suction port of the scroll compression element 3 as equal as possible so that the suction efficiency is improved. An object of the present invention is to provide a highly reliable scroll compressor in which pulsation and noise are suppressed by improving the scroll compressor.

[0007]

Means for Solving the Problems As a result of intensive studies made by the present inventors on such a problem, the cross-sectional area of the inlet portion of a specific refrigerant passage when the gap between the fixed wrap and the swing wrap is maximized is A1, The cross-sectional area of the inlet portion of the first suction port is A2,
When the cross-sectional area of the inlet portion of the communication groove is A3, these should be within the range represented by the specific formula (1), and / or from the inlet portion of the communication groove to a specific position. It has been found that the problem can be solved by providing a narrowed portion between the narrowed portions and making the cross-sectional area a3 of the communication groove extending from the narrowed portion to the second suction port smaller than the cross-sectional area A3, and has achieved the present invention. .

That is, the invention of claim 1 of the present invention comprises an electric element and a scroll compression element driven by the electric element in a closed container, and the scroll compression element has a fixed scroll having a spiral fixed wrap. And a rocking scroll having a spiral rocking wrap that orbits the fixed scroll by driving the electric element to form a plurality of compression chambers, and the scroll compression element is provided from outside the hermetic container. The refrigerant gas introduced into the refrigerant introduction portion of the outer periphery of the first suction port and the second suction port communicated with the first suction port at a position opposite to the first suction port are connected by a communication groove communicating with the first suction port, and the compression is performed. A scroll-type compressor that compresses in a chamber and discharges to the outside of the hermetically sealed container, wherein the sucked cooling is performed when the gap between the fixed wrap and the swing wrap becomes maximum. There the cross-sectional area of the inlet portion of the refrigerant passage extending through the outer periphery from the end portion of the swing lap to the second inlet and A1, the cross-sectional area of the inlet portion of the first suction port A2
And the cross-sectional area of the inlet of the communication groove is A3, A1, A2 and A3 are in the range represented by the following formula (1). 1.5 ≦ A2 / (A1 + A3) ≦ 2.5 Formula (1)

According to a second aspect of the present invention, an electric element and a scroll compression element driven by the electric element are provided in a closed container, and the scroll compression element has a fixed scroll having a spiral fixing wrap. And a rocking scroll having a spiral rocking wrap that orbits the fixed scroll by driving the electric element to form a plurality of compression chambers, and the scroll compression element is provided from outside the hermetic container. The refrigerant gas introduced into the refrigerant introduction portion of the outer peripheral portion of the second communication port is connected to the first suction port and the second suction port communicating with the first suction port at a position facing the first suction port.
A scroll-type compressor that sucks in from a suction port, compresses in the compression chamber, and discharges to the outside of the hermetic container, a line that extends and connects the center of the rotating shaft of the electric element and the center of the refrigerant introducing portion. And L is the length between two points where a line passing through the center of the width of the communication groove intersects, L from the inlet of the communication groove
4 is provided with a throttle part, and the cross-sectional area a3 of the communication groove from the throttle part to the second suction port is smaller than the cross-sectional area A3 of the inlet part. .

According to a third aspect of the present invention, in the scroll compressor according to the second aspect, the a3 and the A3 are in a range represented by the following formula (2). 0.8 ≦ a3 / A3 ≦ 1.0 Formula (2)

According to a fourth aspect of the present invention, in the scroll compressor according to the first aspect, a line that extends and connects the center of the rotating shaft of the electric element and the center of the refrigerant introducing portion, and the communication groove. When the length between the two points where the line passing through the center of the crossing is intersected is L, a throttle portion is provided between the inlet of the communication groove and L / 4, and from this throttle portion to the second suction port. A cross-sectional area a3 of the communication groove is smaller than a cross-sectional area A3 of the inlet portion.

According to a fifth aspect of the present invention, in the scroll compressor according to the fourth aspect, the a3 and the A3 are in a range represented by the following formula (3). 0.8 ≦ a3 / A3 ≦ 1.0 Formula (3)

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS. Figure 1
Is a fixed wrap, a swing wrap, a refrigerant introduction part, a first suction port, a communication groove, a second suction port, etc. when the gap between the fixed wrap and the swing wrap of the scroll compressor of the present invention is maximized. It is explanatory drawing which shows the relationship of. FIG. 2 shows a fixed wrap, an oscillating wrap, and a wrap, when the gap between the fixed wrap and the oscillating wrap of another scroll compressor of the present invention is maximized.
It is explanatory drawing which shows the relationship of a refrigerant | coolant introduction part, a 1st suction port, a communicating groove, a 2nd suction port, etc. 1 and 2, portions indicated by the same reference numerals as those in FIG. 6 have the same functions as the portions indicated by the same reference numerals in FIG.

As shown in FIG. 1, the scroll compression element 3
In addition, a fixed scroll 15 having a spiral fixed wrap 16 and an orbiting scroll 12 having a spiral wrap 14 revolving around the fixed scroll 15 by driving the electric element 2 (not shown) are provided. A plurality of compression chambers 17 are formed in mesh with each other.

Then, from the outside of the airtight container 1 (not shown), the refrigerant introduction portion 21 on the outer peripheral portion of the scroll compression element 3 is provided.
The refrigerant gas introduced into the first communication port 22 communicates with the first suction port 22 formed between the swing wrap 14 and the fixed wrap 16 and a position opposite to the first suction port 22. It is sucked from the second suction port 24 connected to the communication groove 23, compressed in the compression chamber 17, and gradually moves to the center to reduce the volume to the central portion of the other side surface of the fixed scroll 15. The ink is discharged from a discharge port 19 (not shown) provided.

About half of the refrigerant gas introduced into the refrigerant introducing portion 21 is sucked from the first suction port 22, and the rest is sucked from the second suction port 24 through a plurality of passages. The first refrigerant gas is a refrigerant gas that is absorbed by the second suction port 24 through a refrigerant passage 25 formed between the outer periphery of the swing wrap 14 and the outermost inner surface of the fixed scroll 15. The second refrigerant gas that is present and is sucked into the second suction port 24 is the refrigerant gas that is absorbed by the second suction port 24 through the communication groove 23.

The first suction port 22 and the second suction port 24
In order to make the amount of the refrigerant sucked from the refrigerant passage 25 as equal as possible, the cross-sectional area of the inlet portion 26 of the refrigerant passage 25 is A1, the cross-sectional area of the inlet portion 27 of the first suction port 22 is A2, and the communication is performed. The cross-sectional area of the inlet portion 28 of the groove 23 is A3
It is essential that A1, A2 and A3 are within the range represented by the above formula (1). The scroll compressor of the present invention is the same as the scroll compressor 1A shown in FIG. 6 except that it has such a configuration. [A2 / (A1 + A3)] represented by the formula (1) is 1.
If it is less than 5 or exceeds 2.5, the first
The balance of the amounts of the refrigerant sucked from the suction port 22 and the second suction port 24 is lost, the suction efficiency is deteriorated, pulsation is increased, noise is generated, and reliability is lowered.

In FIG. 3, [A2 / (A1 + A3)] is 1.
In the case of 5, 2.0 and 2.5, the first suction port 22
And the mass flow rate (kg / s) of the refrigerant sucked from the second suction port 24 are shown. When [A2 / (A1 + A3)] is particularly 1.5 or 2.0, the amount of the refrigerant sucked from the first suction port 22 and the second suction port 24 is well balanced and becomes substantially uniform. I understand.

Further, as shown in FIG. 2, in another scroll type compressor of the present invention, in order to equalize the amounts of the refrigerant sucked from the first suction port 22 and the second suction port 24 as much as possible. In addition, a line c that extends and connects the center O of the rotating shaft 6 of the electric element 2 and the center a of the coolant introducing portion 21 that are not shown intersects with a line d that passes through the center of the width of the communication groove 23 ( When the length between x and y) is L, a throttle portion 29 is provided between the inlet portion 28 of the communication groove 23 and L / 4, and the throttle portion 29 to the second suction port 24 The cross-sectional area a3 of the communication groove 23 is equal to the cross-sectional area A of the inlet portion 24.
Make it smaller than 3. Preferably, the ratio of a3 / A3 is in the range represented by the above formula (3). Other than such a configuration, another scroll type compressor of the present invention is similar to the scroll type compressor 1A shown in FIG.

In FIG. 4, [A2 / (A1 + A3)] is 2.
0, and the position where the throttle portion 29 is provided is 0 (refrigerant introduction portion 21
Immediately after), the mass flow rate (kg / s) of the refrigerant sucked from the first suction port 22 and the second suction port 24 when L / 4 and L / 2 are shown. It is understood that the balance is lost in the case of L / 2, but the balance is improved by providing the narrowed portion 29 between the inlet portion 28 of the communication groove 23 and L / 4.

In FIG. 5, [A2 / (A1 + A3)] is 2.
0 and the position where the diaphragm portion 29 is provided is L / 4,
The suction flow velocity (m / s) of the refrigerant sucked from the first suction port 22 and the second suction port 24 when the ratio of a3 / A3 is changed to 0.5, 0.8, and 1 is shown. It can be seen that the balance is lost when the ratio a3 / A3 is 0.5, but the balance is improved when the ratio a3 / A3 is 0.8 and 1.0.

In the above description of the present invention, the horizontal scroll type compressor has been described. However, the scroll type compressor of the present invention is not limited to the horizontal type, and the vertical type scroll type compressor can be used. It can also be applied to machines and other types of scroll compressors.

[0023]

In the scroll compressor of the present invention, the amounts of the refrigerant sucked from the first suction port and the second suction port are made as equal as possible, so that the suction efficiency is improved, and the pulsation and noise are improved. Is suppressed, reliability is improved, and stable operation is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of the scroll compressor according to the present invention, in which the gap between the fixed wrap and the oscillating wrap is maximized, the fixed wrap, the oscillating wrap, the refrigerant introducing portion, the first suction port, the communication groove, and the second suction. It is explanatory drawing which shows the relationship of a mouth etc.

FIG. 2 is a view showing another scroll type compressor according to the present invention when the gap between the fixed wrap and the swing wrap is maximized, the fixed wrap, the swing wrap, the refrigerant introduction part, the first suction port, the communication groove, It is explanatory drawing which shows the relationship of 2 suction ports.

FIG. 3 is a graph showing the mass weight (kg / s) of the refrigerant sucked from the first suction port and the second suction port.

FIG. 4 is a graph showing the mass weight (kg / s) of the refrigerant sucked from the first suction port and the second suction port.

FIG. 5 is a graph showing the suction flow velocity (m / s) of the refrigerant sucked from the first suction port and the second suction port.

FIG. 6 is a cross-sectional view showing the overall configuration of a conventional scroll compressor.

[Explanation of symbols]

b Lubricating oil 1A scroll type compressor 1 closed container 2 electric elements 3 scroll compression element 4 stator 5 rotor 6 rotation axes 7 Support frame 8 Refueling department 9 Oil introduction pipe 10 oil passage 11 pin part 12 orbiting scroll 13 Boss hole 14 rocking wrap 15 Fixed scroll 16 fixed wrap 17 Compression chamber 18 Inhalation tube 19 Discharge port 20 discharge pipe 21 Refrigerant introduction part 22 First suction port 23 Communication pipe 24 Second suction port 25 Refrigerant passage 26, 27, 28 Entrance 29 Aperture

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuya Sato 2-5-5 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Kazuaki Fujiwara 2-chome, Keihan Hondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Inventor Kenzo Matsumoto 2-chome, Keihan Hon-dori, Moriguchi City, Osaka Prefecture 5-5 Sanyo Electric Co., Ltd. (72) Takashi Sato 2-chome, Keihan Hon-dori, Moriguchi City, Osaka Prefecture 5-5 Sanyo Electric Co., Ltd. (56) Reference JP 61-226585 (JP, A) JP 3-134286 (JP, A) JP 59-79085 (JP, A) JP JP 7-91380 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (5)

(57) [Claims] 1. A hermetically sealed container comprising an electric element and a scroll compression element driven by the electric element, the scroll compression element having a fixed scroll having a spiral fixed wrap, and the fixed scroll having the electric element A plurality of compression chambers are formed by meshing with an orbiting scroll having an orbital orbiting wrap that revolves when the elements are driven, and the plurality of compression chambers are introduced from the outside of the hermetic container into the refrigerant introduction portion on the outer peripheral portion of the scroll compression element. Refrigerant gas is sucked from the first suction port and a second suction port connected to a position facing the first suction port through a communication groove communicating with the first suction port and compressed in the compression chamber to outside the closed container. In the scroll compressor, the sucked refrigerant is drawn from the end of the swing wrap to the outer periphery thereof when the gap between the fixed wrap and the swing wrap is maximum. The cross-sectional area of the inlet portion of the refrigerant passage leading to the second suction port via A1 is A1, the cross-sectional area of the inlet portion of the first suction port is A2, and the cross-sectional area of the inlet portion of the communication groove is A3. At this time, A1, A2, and A3 are in a range represented by the following formula (1). 1.5 ≦ A2 / (A1 + A3) ≦ 2.5 Formula (1) 2. A hermetically sealed container comprising an electric element and a scroll compression element driven by the electric element, the scroll compression element having a fixed scroll having a spiral fixed wrap, and the fixed scroll having the electric element A plurality of compression chambers are formed by meshing with an orbiting scroll having an orbital orbiting wrap that revolves when the elements are driven, and the plurality of compression chambers are introduced from the outside of the hermetic container into the refrigerant introduction portion on the outer peripheral portion of the scroll compression element. Refrigerant gas is sucked from the first suction port and a second suction port connected to a position facing the first suction port through a communication groove communicating with the first suction port and compressed in the compression chamber to outside the closed container. In the scroll type compressor that discharges to, the line connecting the center of the rotary shaft of the electric element and the center of the refrigerant introduction part by extension and the line passing through the center of the width of the communication groove intersect 2 When the length between the points is L, a throttle portion is provided between the inlet portion of the communication groove and L / 4, and the cross-sectional area a of the communication groove from the throttle portion to the second suction port is a.
3. The scroll compressor, wherein 3 is smaller than the cross-sectional area A3 of the inlet portion. 3. The scroll compressor according to claim 2, wherein the a3 and the A3 are in a range represented by the following formula (2). 0.8 ≦ a3 / A3 ≦ 1.0 Formula (2) 4. When the length between two points where a line extending and connecting the center of the rotating shaft of the electric element and the center of the refrigerant introducing portion and a line passing through the center of the communication groove intersect is L. , A narrowed portion is provided between the inlet of the communication groove and L / 4, and a cross-sectional area a3 of the communication groove from the narrowed portion to the second suction port.
2. The scroll compressor according to claim 1, wherein the cross section is smaller than the cross-sectional area A3 of the inlet portion. 5. The scroll compressor according to claim 4, wherein the a3 and the A3 are in a range represented by the following formula (3). 0.8 ≦ a3 / A3 ≦ 1.0 Formula (3)