JPH0684754B2 - Scroll compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scroll compressor for refrigerating and cooling.

2. Description of the Related Art A scroll system has been drawing attention as a recent refrigeration compressor. The operating principle of such a scroll compressor will be described with reference to FIGS. 3 (a) to 3 (d).

FIG. 3 (a) shows a phase relationship between the movable scroll wrap 1a and the fixed scroll wrap 2a in a state where compression is started upon completion of suction, and FIGS. 3 (b), 3 (c) and 3 ( FIG. 3D shows a state in which the movable scroll wrap 1a is rotated 90 degrees counterclockwise from the states of FIGS. 3A, 3B, and 3C, respectively. As the state of FIG. 3 (a) shifts to the state of FIG. 3 (b) and FIG. 3 (c), the closed space formed by both scroll wraps 1a and 2a decreases, the refrigerant is compressed, and the closed space is closed. The compressed refrigerant is discharged by communicating with the discharge hole 3. When the movable scroll wrap 1a further rotates 90 degrees from the state of FIG. 3 (d), it returns to the original state, that is, the state of FIG. 3 (a). 3 (a) to 3 (d), the enclosed space is formed by the radial contact points 4 of the scroll wraps 1a and 2a.

A conventional scroll compressor will be described with reference to FIG. Reference numeral 2 denotes a fixed scroll which is composed of an end plate 2b having a discharge hole 3 and a fixed scroll wrap 2a having an involute curve which stands upright on the end plate 2b and is fixed to the housing 5. Reference numeral 1 denotes a movable scroll, which comprises a mirror plate 1b and a movable scroll wrap 1a formed by an involute curve which stands upright on the mirror plate 1b. The movable scroll 1 is rotatable via a bearing 7a of a frame 6 fixed to a housing 5. Bearings on the crank portion 8a of the supported shaft 8
The movable scroll wrap 1a is mounted via the 7b, and the movable scroll wrap 1a is assembled so as to mesh with the fixed scroll wrap 2a. A rotation preventing mechanism 9 is provided to prevent the movable scroll 1 from rotating, and is fixedly attached to the frame 6. The shaft 8 is pivoted by a motor composed of a stator 10 and a rotor 11 to move the movable scroll 1 relative to the fixed scroll 2 as shown in FIG. 3 to pressurize the refrigerant gas in the sealed space 12.

In the scroll compressor as described above, a through space is provided in the movable scroll 1 or the fixed scroll 2 to form a closed space.
There is one that takes out the compressed refrigerant from the inside 12 or injects the refrigerant gas into the closed space 12 (for example, JP-A-55-37520).
Japanese Patent Laid-Open No. 53-119412 and Japanese Patent Laid-Open No. 54-81513).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, according to the description in the above-mentioned patent publication, conventionally, the improvement of the sealing property between the tip of the scroll wrap and the scroll end plate is mainly a problem. Absent.

In addition, in a conventional scroll compressor in which a movable scroll or a fixed scroll is provided with a through hole, one through hole is provided at a position approximately 180 ° ahead of the other through hole. The two through holes were not always located in different sealed spaces under the same pressure condition.

This will be described with reference to FIGS. 5 and 6.

In FIG. 5, one through hole 21 is located in the center between the fixed scroll wraps, the other through hole 22 is in contact with the outer diameter side of the fixed scroll wrap, and in FIG. 6, one through hole 31 is the fixed scroll. The other through hole 32, which is in contact with the inner diameter side of the wrap, is provided in the central portion between the fixed scroll wraps.
And each (A), when the crank angle is 0 °,
FIG. 3B shows the case where the crank angle is 180 °.

First, in FIG. 5, in FIG. 5 (A), although located in different sealed spaces under the same pressure condition, the flow resistance is different and the pressures are uneven because the opening areas are different.

Further, FIG. 3B is located in the same compression space.

Next, in FIG. 6 (A) is located in different sealed spaces under the same pressure condition, but the flow resistance is different. Further, FIG. 3B is located in the compression space under different pressure conditions.

Therefore, in the conventional scroll compressor of this type, by providing the through holes, the pressure in the enclosed space becomes uneven, extra torque is applied to the rotation preventing mechanism of the movable scroll, and performance is deteriorated. I was there.

Therefore, an object of the present invention is to make the refrigerant pressures of the compression chambers forming a pair always equal in a compressor provided with a through hole.

Means for Solving the Problems In order to achieve the above object, the present invention is such that half of the through holes are in contact with the outer diameter side of the fixed scroll wrap or the movable scroll wrap, and the remaining half of the through holes are the fixed scroll wrap or The through hole that is in contact with the inner diameter side of the movable scroll wrap and is in contact with the inner diameter side is the helix line with respect to the through hole that is in contact with the outer diameter side with the center portion of the curved line of the fixed scroll wrap or the movable scroll wrap as the center. It is provided at a position where the curve advances by approximately 180 °.

Action Due to the above means, the through holes forming a pair are always located in different closed spaces under the same pressure condition.

Embodiment A scroll compressor according to an embodiment of the present invention will be described below with reference to FIG. 1 together with a refrigerant circuit.

For the sake of convenience, the same functional parts as those in FIG. 4 are designated by the same reference numerals.

A scroll compressor 13 according to one embodiment of the present invention includes a movable scroll 1 in which a wrap made of an involute curve is formed upright on an end plate, and a fixed scroll 2 having a wrap also made of an involute curve. The movable scroll 1 and the fixed scroll 2 are engaged with each other with the wraps inside, and the movable scroll 1 is caused to orbit with respect to the fixed scroll 2 so that the refrigerant gas in the closed space 12 closed by the scrolls 1 and 2 is discharged. Boost.

In FIG. 1, the scroll compressor 13 is connected to a condenser 14, a pressure reducer 15, an evaporator 16, etc. to form a refrigerant circuit. Reference numerals 17a and 17b denote through holes provided in the end plate of the fixed scroll 2, and in this case, two through holes are provided. An introduction pipe 18 connecting the closed space 12 and the outlet of the condenser 14 through the through holes 17a and 17b is provided. The refrigerant pressure in the closed space 12 is the scroll compressor.
The through holes 17a and 17b are provided at positions such that the suction pressure in the suction pipe 19 of 13 and the discharge pressure in the discharge hole 3 are approximately in the middle (geometric mean).
Is provided. Then, as shown in FIG. 2, one through hole 17a is provided at a position in contact with the inner diameter side involute curve of the fixed scroll wrap 2a, and the other through hole 17b is in contact with the outer diameter side involute curve of the fixed scroll wrap 2a. The through hole 17b is provided at a position advanced by an angle of about 180 ° with respect to the through hole 17a by the involute curve. Further, a decompressor 20 is provided for adjusting the refrigerant pressure to the closed space 12 in the introduction pipe 18.

The operation of the above configuration will be described.

Operate the scroll compressor 13 to move the movable scroll 1 to the third position.
When the fixed scroll 2 is swung as shown in the figure, the refrigerant gas in the closed space 12 is compressed and the high-temperature high-pressure gas is discharged from the discharge hole 3, flows into the condenser 14, is liquefied and condensed, and is decompressed in the decompressor 15. It is squeezed to become a low-pressure refrigerant, which endothermically evaporates in the evaporator 16 and the low-pressure gas returns from the suction pipe 19 to the compressor 13 to perform refrigerant or freezing. In this case, the high-pressure refrigerant at the outlet of the condenser 14 is pressure-controlled by the decompressor 20 by the introduction pipe 18 to become a low-temperature refrigerant, which flows into the closed spaces 12a and 12b through the through holes 17a and 17b, respectively, and the pressure is already raised to an intermediate pressure. The refrigerant gas in the space (12) is cooled to reduce the compression work, and the amount of compressed refrigerant is increased to improve the performance of the compressor (13). Further, since the refrigerant pressures in the closed spaces 12a, 12b are equal, the amounts of the low-temperature refrigerants respectively flowing in from the introduction pipes 18 become equal, and therefore the refrigerant pressures in the closed spaces 12a, 12b after the low-temperature refrigerant has flowed in are also equal. Also, even when they join each other and communicate with the discharge hole 3, there is an effect that there is no mutual flow or turbulence and no loss occurs.

In this embodiment, the through hole 17 is provided in the end plate of the fixed scroll 2 to introduce the refrigerant liquid at the outlet of the condenser 14 into the scroll compressor. It is also possible to introduce it.

As described above, the scroll compressor in the present embodiment is provided with the through hole on the end plate side of the fixed scroll, so that the refrigerant liquid can be introduced into the cylinder in the compressor easily and inexpensively, and the intermediate pressure once in the compressor can be obtained. Cools high-temperature refrigerant gas that has been boosted to up to reduce compression work and increases the amount of discharged refrigerant to improve the performance of the compressor, and when providing an even number of through holes, seal each pair as a pair. Since the low-temperature refrigerant is introduced to the place where the refrigerant pressure is the same in the space cylinder, almost the same introduction amount can be selected, the torque balance is good, and even after the even number of closed spaces have joined, the refrigerant pressure is almost the same. There is no backflow or turbulence between them, there is little loss, the pressure of the refrigerant introduced into the closed space of the compressor can be adjusted by installing a pressure reducer in the introduction pipe, and the compressor can be stopped. The conducted smoothly refrigerant pressure balance the refrigerant flows through the inlet pipe side in the reverse of the cylinder enclosed space, not to apply an excessive load on reboot.

As is apparent from the above description, according to the present invention, the end plate of the fixed scroll or the movable scroll is provided with an even number of through holes, and half of the through holes are on the outer diameter side of the fixed scroll wrap or the movable scroll wrap. The other half of the through holes are in contact with the inner diameter side of the fixed scroll wrap or the movable scroll wrap, and the through holes in contact with the inner diameter side are in contact with the outer diameter side of the fixed scroll wrap or the movable scroll wrap. The refrigerant pressure in each closed space having a pair of through holes can always be made equal by arranging the curve so that the curve is advanced by about 180 ° about the center of the curve. As a result, it is possible to suppress wear of each component such as bearings without adding extra torque to the movable scroll and its rotation prevention mechanism. It is possible to extend the life of the product. Further, it is possible to suppress the noise generated when the movable scroll is tilted, which is generated when the excessive torque is applied. Further, it is possible to suppress the friction loss of the bearing and the like that occurs when receiving an excessive torque, and prevent the deterioration of the compressor efficiency.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram having a scroll compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of the scroll compressor according to the embodiment, and FIG. FIGS. 4 and 5 are sectional views of a conventional scroll compressor, and FIGS. 5 and 6 are sectional views of a conventional scroll compressor having through holes. 1 ... Movable scroll, 1a ... Movable scroll wrap,
2 ... fixed scroll, 2a ... fixed scroll wrap,
3 ... Discharge hole, 9 ... Rotation prevention mechanism, 12 ... Sealed space,
17a, 17b ... through hole, 18 ... introduction pipe, 20 ... decompressor.

Claims (1)

[Claims] 1. A fixed scroll and a movable scroll in which a wrap consisting of a curved line is formed on an end plate are meshed with each other with the wraps inside, and the movable scroll is caused to orbit with respect to the fixed scroll, and is closed by the both scroll wraps. In a scroll compressor that pressurizes the enclosed space,
An even number of through holes are provided in the end plate of the fixed scroll or the movable scroll, half of the through holes are in contact with the outer diameter side of the fixed scroll wrap or the movable scroll wrap, and the remaining half of the through holes are the fixed scroll wrap or While being in contact with the inner diameter side of the movable scroll, the through-hole which is in contact with the inner diameter side with respect to the through-hole which is in contact with the outer diameter side is centered around the central portion of the line curve of the fixed scroll wrap or the movable scroll wrap. Is a scroll compressor that is installed at an angle of about 180 °.