JPH11303777A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge residual coolant in a compression chamber of a compressor when a scroll compressor is stopped. SOLUTION: In this type of scroll compressor, relief holes 44, 46 are formed on a portion in a compression chamber 64 of a fixed scroll relevant to the way of a compression process. At the time of starting the scroll compressor, liquid coolant prepared by liquefying cooling medium and refrigeration oil are discharged from the relief holes 44, 46 by the use of less pressure on a back side of the fixed scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for supplying a refrigerant for an air conditioner.

[0002]

2. Description of the Related Art In general, an air conditioner in which a compressor, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are sequentially connected to form a refrigerant circuit is known. In such an air conditioner, when the refrigerant is pressurized in the compressor, the oil for lubricating the rotating member is mixed with the refrigerant, and after discharging from the compressor, the separation device is attached to separate the oil to separate the refrigerant so that only the refrigerant is removed. It flows to the four-way valve. However, when the compressor is stopped, a phenomenon that a part of the refrigerant containing oil stays in the refrigerant passage from the refrigerant inlet of the compressor to the separation device (a stagnation phenomenon) occurs. Especially,
There is a problem that the refrigerant that has fallen in the compression chamber is liquefied (the refrigerant becomes the refrigerant liquid and the oil mist becomes the liquid oil) with the passage of time.

[0003] If there is a refrigerant containing oil stored in the compression chamber of the compressor, the refrigerant liquid and liquid oil will be compressed in the compression chamber when the compressor is started next time. At this time, the inside of the compressor, in particular, the compression chamber may be damaged by compressing the liquid having a smaller compression ratio than the gas.

In order to prevent such damage inside the compressor, the strength of the fixed scroll and the movable scroll constituting the compression chamber must be improved. In addition, measures have been taken to reduce the impact when compressing liquid by reducing the number of connection rotations of a clutch arranged in a power transmission mechanism for rotating the orbiting scroll.

[0005]

However, the improvement of the strength of the members such as the fixed scroll and the movable scroll has problems such as material cost and increase in the weight of the compressor.
The discharge force at the time of starting the compressor was to be reduced by lowering the clutch connection rotation speed of the movable scroll.

Therefore, the present invention provides a compressor which does not cause the above-described problems when the compressor is started next time, even if the refrigerant containing oil stagnates in the pressurizing chamber of the compressor when the compressor is stopped. Providing is a technical issue.

[0007]

Means for Solving the Problems The technical means taken in the present invention to solve the above technical problem is to provide a scroll compressor having a housing having an inlet and an outlet, a housing which is housed in the housing and has a first side. A fixed scroll having a spiral body, a movable scroll having a second scroll body fitted to the first spiral body, and eccentrically rotating to form a compression chamber between the fixed scroll and a movable scroll; and a housing in the compression chamber. A suction passage for guiding fluid from the inlet, a hole penetrating a fixed scroll provided at a position for maximally compressing the fluid in the compression chamber, and a lead member attached to the other side of the fixed scroll so that the hole can be closed. Comprising a discharge valve, a hole penetrating a fixed scroll provided in the middle of the compression process in the compression chamber, and a lead member attached to the other side of the fixed scroll so as to close the hole. A valve is that from the other side of the fixed scroll was composed of a discharge passage for guiding the fluid to the outlet of the housing. This configuration pays attention to the fact that the pressure of the portion of the fixed scroll on the other side where the discharge fluid is discharged is small when the scroll compressor is started. That is, since the pressure on the other side of the fixed scroll is small,
When the scroll compressor is started, during the compression process of the pressure in the compression chamber, the lead member of the relief valve is opened, and the stagnated refrigerant staying inside the compression chamber and discharging to the discharge side. On the other hand, after starting the scroll compressor,
The pressure increases due to the presence of the refrigerant that has been pressurized and discharged on the other side of the fixed scroll, and the lead member of the relief valve provided in the middle of the compression process is closed,
The refrigerant will not be discharged to the discharge side during the compression process, but will be discharged from the discharge valve to the discharge side only at the position where compression is maximized. Therefore, when the scroll compressor is started (when the pressure on the other side of the fixed scroll is small), the lead member of the relief valve is opened to discharge the refrigerant that has fallen inside the compression chamber via the relief valve, and the scroll compressor is activated. In the middle (when the pressure on the other side of the fixed scroll is small), the relief valve is closed, and the refrigerant is discharged only from the discharge valve.

[0008] Preferably, the scroll compressor includes a plurality of relief valves, and each relief valve is arranged so as to be evenly distributed on the fixed scroll. According to this configuration, the refrigerant laid down when the scroll compressor is started can be reliably discharged to the discharge side without being affected by the rotational position of the orbiting scroll.

More preferably, the lead member of the discharge valve of the scroll compressor and the lead member of the relief valve are made of the same material and have the same thickness. According to this configuration, the components can be shared, and the cost can be reduced.
Further, selection of a lead member can be easily performed. That is, when the pressure on the discharge side of the fixed scroll is small, the reed member required for the present invention can open the relief valve,
When the pressure on the discharge side of the fixed scroll is large, it is necessary to have a characteristic that only the discharge valve having the maximum pressure in the compression chamber can be opened without opening the relief valve. The reed member is required to have a pressure characteristic that changes the opening and closing of the valve between the maximum pressure of the compression chamber and the pressure during the compression process, and this can be easily selected.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a scroll compressor 10 of the present invention.

The external appearance of the scroll compressor 10 is composed of a housing 16 having an inlet 12 and an outlet 14 and a clutch pulley 18 for transmitting the driving force of an engine (not shown) via a compressor belt (not shown) or the like. ing.

One end (left end in the figure) of the shaft 20 is fixed integrally with the timing pulley 18 at the center of rotation of the timing pulley 18. This shaft 20 is rotatably supported by an inner bearing 22 and an outer bearing 24. The other end (the right end in the figure) of the shaft 20 extends into the housing 16, and a large-diameter portion 21 having a large diameter is formed at the end. Note that a mechanical seal 26 is arranged on the outer periphery of the shaft 20 located between the timing pulley 18 and the housing 16.

The housing 16 includes a substantially cylindrical partition member 28, a fixed scroll 32 fixed to one end of the partition member 28 by a screw 30, and a movable scroll 56 fitted to the fixed scroll 32.

As shown in FIGS. 2 and 3, the fixed scroll 32 includes a disk-shaped main body 34, a spiral body 36 projecting to one side (the left side in FIG. 2) of the main body 34, and a main body 34. And an annular ring 38 projecting to the other side (the right side in FIG. 2) of the portion 34. Fixed scroll 32
Is provided with a wavy preventing plate 40 having an L-shaped cross section. FIG. 3 is a side valve diagram of FIG. 2 viewed from the right side in FIG.
For the sake of explanation, the wavy preventing plate 40 is omitted. The main body 34 is provided with one discharge hole 42 and two relief holes 44 and 46. The ejection hole 42
Is a spiral body 3 fitted with a movable scroll 56 described later.
6 are formed at the maximum compression position of the pressure chamber 64 formed by the pressure chamber 6, and the relief holes 44 and 46 are both formed at the position where the pressure chamber 64 is being compressed. Discharge hole 42 and relief 44,
46 is closed by lead members 50, 52, 54 which are respectively fixed by bolts 48. As shown by broken lines in FIG. 2, the ejection holes 42 and the relief holes 44, 4
When the pressure of 6 increases, the lead members 50, 52, 54 bend and open the discharge holes 42 and the reliefs 44, 46. Further, the outer peripheral portion of the spiral body 36 of the fixed scroll 32 is fixed by the partition member 28 and the screw 30 as shown in FIG.

The movable scroll 56 includes a main body 58, a spiral body 60, and a flange 62. The main body 58 has a disk shape and a diameter smaller than that of the main body 34 of the fixed scroll 32. The spiral body 60 is formed on a surface of the main body part 58 opposing the main body part 34 of the fixed scroll 32, and the spiral body 36 of the fixed scroll 32 is formed.
To form a pressure chamber 64. The flange portion 62
It has an annular shape and is formed integrally with the main body 58 on the surface (left side in the drawing) of the main body 58 opposite to the surface on which the spiral body 60 is formed.

The partition member 28 has a substantially cylindrical shape, and rotatably holds the large-diameter portion 21 of the shaft 20 via a bearing 66 at the center in the axial direction. Also, an axial communication hole 70,
The housing 16 has an annular hole 72 communicating with the communication hole 70.
And the outer peripheral portion of the pressure chamber 64 are communicated with each other.
Further, between the outer periphery of the partition member 28 and the inner periphery of the housing 16, the back side of the fixed scroll 32 (the annular ring 38).
A passage 74 is formed to communicate the space K on the side) with the discharge port 14 of the housing 16. The lower half of the passage 74 formed on the outer periphery of the partition member 28 is an oil pan 75 for storing oil (refrigeration oil) for lubricating various rotating parts of the scroll compressor. The liquid level M of the refrigerating machine oil is set so as not to climb over the waving preventing plate 40, so that the refrigerating machine oil does not flow into the pressure chamber 64 through the discharge hole 42 and the relief holes 44 and 46. The oil pan 75 has an oil extraction hole 84.
Is formed, and the pressure of the fluid discharged from the discharge hole 42 acts on the liquid surface of the oil pan 75 to extract the pressurized refrigerating machine oil, and the shaft 20 passes through an oil passage (not shown).
The refrigerating machine oil is supplied to the lubricating oil passage 86 of the rotating part of the above.

The back surface of the movable scroll 56 (the flange 6)
2), bearings 7 attached to the inner wall of the flange portion 62
6 and a large-diameter portion 21 of the shaft 20 via an eccentric bush 78 to form an integral component. A counterweight 80 is fixed to the outer peripheral side of the eccentric bush 78, and an Oldham ring 82 is attached to the outer periphery of the flange portion 62 of the movable scroll 56.
With the above configuration, the movable scroll 56 is
With the rotation of 0, the shaft 20 can be rotated about a position eccentric with respect to the rotation axis of the shaft 20 by a predetermined amount. In addition, the movable scroll 56 performs a revolving motion in which rotation is prevented by the Oldham ring 82. As a result of this orbiting motion, as shown in FIG.
The pressure chamber 64 formed between the movable scroll 6 and the spiral body 60 of the movable scroll 56 is guided to the center of the fixed scroll 32 while gradually reducing the volume.

The scroll compressor 10 having the above configuration
The operation of will be described.

The driving force of an engine (not shown) is transmitted to the clutch pulley 18 via the compressor belt, and the clutch pulley 18 is rotated. The shaft 20 integrated with the clutch pulley 18 rotates, and the movable scroll 56 connected to the shaft 20 rotates eccentrically. By the eccentric rotation of the movable scroll 56, the pressure chamber 64 defined between the spiral body 36 of the fixed scroll 32 and the spiral body 60 of the movable scroll 56 is gradually reduced in volume and fixed while rotating. Guided to the center of the scroll.
Therefore, the refrigerant guided to the outer periphery of the fitting portion between the fixed scroll 32 and the movable scroll 56 through the suction port 12 and the communication hole 70 is compressed by the compression chamber 64. A part of the refrigerant is blown from the suction port 12 to the mechanical seal 26, and after cooling the mechanical seal 26, the annular hole 7 is cooled.
2. It is guided to the outer periphery of the fitting portion between the fixed scroll 32 and the movable scroll 56 through the communication hole 70.

The refrigerant compressed by the compression chamber 64 is discharged to the space K on the back surface of the fixed scroll 32 through the discharge hole 42. At this time, the pressure of the refrigerant is
2 is bent to the position shown in FIG. 2 to open the discharge hole 42. The refrigerant discharged into the space K on the back surface of the fixed scroll 32 is guided to the protrusion 14 through the passage 74 and is discharged from the protrusion 14.

Here, the refrigerant of the air conditioner will be described. In order to assist lubrication of the sliding portion of the scroll compressor 10, refrigerating machine oil is supplied to the scroll compressor in the form of mist and discharged from the discharge port 14 in order to assist lubrication of the sliding portion of the scroll compressor 10. The pressurized refrigerant separates the refrigeration oil in the oil separator. Therefore, when the scroll compressor is stopped, if there is refrigerant remaining in the pressure chamber 64, the refrigerant and the refrigerating machine oil mixed in the refrigerant are liquefied with the passage of time. When the scroll compressor is started next time, the liquefied refrigerant and the refrigerating machine oil are abnormally compressed even if the pressure in the pressure chamber 64 is reduced and the pressure is increased even if the pressure is increased. Pressure may be applied and the spirals 36, 60, etc. may be damaged.

In the scroll compressor 10, the relief holes 44 and 46 are formed while the volume of the compression chamber 64 is decreasing (compression process). Therefore, even if the refrigerant stagnated in the pressure chamber 64 at the time of startup is present as liquefied refrigerant and liquefied refrigerant, this liquid refrigerant and refrigeration oil are transferred from the relief holes 44 and 46 to the space K on the back side of the fixed scroll 32. It can be released and returned to the oil pan. That is, when the scroll compressor 10 is started, no refrigerant is discharged into the space K on the back side of the fixed scroll 32, and the pressure in the space K on the back side of the fixed scroll 32 is low. it can. On the other hand, while the scroll compressor 10 is rotating, the high-pressure refrigerant fills the space K on the back side of the fixed scroll 32 from the discharge hole 42, and the leads 52 and 54 cannot be opened with the pressure in the compression process.
By maximizing the pressure in the compression chamber 64, the lead 50 can be opened in the discharge hole 42.

When the scroll compressor 10 is started, the clutch pulley 18 is once rotated at a low speed to discharge the refrigerant inside the compression chamber 64, particularly the liquefied refrigerating machine oil, into the space K from the relief holes 44 and 46. After that, the clutch pulley 18 can be rotated at a high speed.

[0024]

According to the first aspect of the present invention, when the scroll compressor is started, the lead member of the relief valve is opened, and the refrigerant that has fallen into the compression chamber through the relief valve is discharged. Can close the relief valve and discharge the refrigerant only from the discharge valve. Therefore, even if there is a liquefied refrigerant inside when the scroll compressor is started, it is possible to prevent damage to the members due to the compression of the liquid having a small pressure fluctuation.

According to the second aspect of the invention, the refrigerant that has fallen asleep when the scroll compressor is started can be reliably discharged to the discharge side without being affected by the rotational position of the movable scroll.

According to the third aspect of the present invention, the components of the lead member can be shared and the cost can be reduced. Further, the selection of the lead member can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a scroll compressor according to the present invention.

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

FIG. 3 is a side view of the fixed scroll of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Scroll compressor 12 Suction port (entrance) 14 Projection port (exit) 16 Housing 32 Fixed scroll 36 Spiral body (first spiral body) 42 Projection hole 44, 46 Relief hole 50, 52, 54 Lead member 56 Movable scroll 60 spiral Body (second spiral body) 70 Communication hole 74 Passage

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshimi Watanabe 2-1-1 Asahi-cho, Kariya-shi, Aichi Pref. Aisin Seiki Co., Ltd.

Claims (3)

[Claims] 1. A housing having an inlet and an outlet, a fixed scroll housed in the housing and having a first scroll on one side, and a second scroll fitted to the first scroll. A movable scroll having an eccentric rotation to form a compression chamber with the fixed scroll; a suction passage for guiding fluid from an inlet of the housing to the compression chamber; and a position for maximally compressing the fluid in the compression chamber. A discharge valve comprising a hole penetrating the fixed scroll provided on the other side of the fixed scroll and a lead member attached to the other side of the fixed scroll so as to close the hole, and the fixed member provided in the middle of a compression process in the compression chamber. A relief valve comprising a hole passing through the scroll and a reed member attached to the other side of the fixed scroll so as to close the hole, and a fluid from the other side of the fixed scroll to an outlet of the housing. Scroll compressor consisting of a discharge passage that guides the air. 2. The scroll compressor according to claim 1, wherein a plurality of said relief valves are provided, and each relief valve is evenly distributed on said fixed scroll. 3. The scroll compressor according to claim 1, wherein the lead member of the discharge valve and the lead member of the relief valve are made of the same material and have the same thickness.