JP2819936B2 - 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 for use in a refrigerating apparatus, and more particularly, to a fixed scroll provided with a suction passage, a check valve provided in the suction passage, and prevention of reverse rotation when stopped. The invention relates to a scroll compressor.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor having a check valve provided in a suction passage provided in a fixed scroll is described, for example, in Japanese Patent Publication No. 1-334312. As shown in FIG. 9, this conventional compressor includes a spiral scroll A1 and a spiral body A2, a fixed scroll C having a discharge port B on the winding start side of the spiral body A2, and a fitting in the spiral groove A. Spiral body E
And a movable scroll F that orbits with respect to the fixed scroll C. Each of the scrolls C and F is
A compression element in which the spiral bodies A2, E are overlapped with each other so as to mesh with each other, and a suction chamber is provided at the end of the spiral of the spiral bodies A2, E is provided in a vertical closed casing G. A high-pressure chamber I communicating with the discharge port B between the top wall of the casing G and the fixed scroll C.
The fixed scroll C is provided with a suction passage J extending in the thickness direction of the fixed scroll C and communicating with the suction chamber. The suction passage J has a disk that opens during operation and closes when operation stops. A check valve K and a spring L for urging the check valve K in a closing direction are housed in the casing G. There is provided a suction pipe M which communicates with the suction passage J through the chamber I vertically.

During operation of the compressor, the pressure in the suction pipe M becomes larger than the pressure in the suction passage J, so that the check valve K is opened against the spring L.
The gas in the suction pipe M is sucked into the compression chamber formed between the spiral body A2 and the spiral body E via the suction passage J and the suction chamber, and the suction gas is compressed to form the discharge port B. Is discharged to the outside through the high-pressure chamber I. When the operation is stopped, the pressure in the suction pipe M becomes smaller than that of the suction passage J. The valve K is closed to close the suction passage J, and the compressed high-pressure gas flows backward from the beginning of the scrolls of the scrolls C and F to the suction pipe M through the suction chamber and the suction passage J. This prevents the movable scroll F from rotating in the reverse direction, thereby preventing the generation of a reverse noise due to the reverse rotation and the outflow of oil contained in the compressed gas to the outside.

[0004]

However, as described above, the compressed high-pressure gas is prevented from flowing backward from the winding start side of each of the scrolls C and F to the suction pipe M through the suction passage J. Therefore, when the check valve K is provided in the suction passage J and the check valve K is always urged in the closing direction by the spring L, when the compressor is operated, the check valve K When the suction passage J is opened by the movement of K, the spring L acts as a movement resistance of the check valve K. That is, the pressure of the suction gas in the suction pipe M is reduced by the urging force of the spring L. As a result, the air is sucked into the suction chamber, and therefore, the volume efficiency in the compression chamber is reduced, and the efficiency of the compressor is reduced.

The present invention has been made in view of the above problems, and has as its object to reduce the pressure of the suction gas sucked from the suction pipe into the suction chamber without causing a pressure loss. It is an object of the present invention to provide a scroll compressor capable of smoothly sucking air into the compressor and improving the volumetric efficiency in the compression chamber, while preventing the gas from flowing backward when the operation is stopped.

[0006]

In order to achieve the above object, the present invention relates to a fixed scroll 2 having a spiral groove 22 and a spiral body 23, and a discharge port 20 communicating with a winding start side of the spiral body 23. A movable scroll 3 having a spiral body 32 fitted into the spiral groove 22 and orbiting with respect to the fixed scroll 2. A suction chamber 6 is provided at a winding end end side of each of the spiral bodies 23 and 32. In a scroll compressor in which a suction pipe 10 communicates with the suction chamber 6, the fixed scroll 2 has a vertical hole 24a extending vertically, and an upper side of the vertical hole 24a communicates with the suction chamber 6. 24, the suction pipe 10 is communicated with the suction passage 24, and the communication side of the vertical hole 24 to the suction chamber 6 is closed by its own weight above the vertical hole 24a; In which the check valve 7 to open the vertical hole 24a to the suction chamber 6 is provided with a pressure difference between the intake pipe 10 and the inlet chamber 6.

In a horizontal scroll compressor in which the fixed scroll 2 and the movable scroll 3 are arranged in a horizontal direction, the fixed scroll 2 extends vertically from below the fixed scroll 2 and extends vertically. 6
A suction passage 24 formed of a vertical hole that opens into the suction chamber 6 is provided. The opening width of the suction passage 24 with respect to the suction chamber 6 is made smaller than the diameter of the suction passage. Is slidably mounted.

Further, in a vertical scroll compressor in which the fixed scroll 2 and the movable scroll 3 are vertically arranged, the suction passage 24 is defined by a partition formed on the upper surface of the fixed scroll 2 by the partition plate 13. Room 25
A vertical hole 24a extending from the compartment 25 in the thickness direction of the fixed scroll 2, a communication passage 26 communicating the compartment 25 with the suction chamber 6, and a fixed scroll 2a extending from the lower end of the vertical hole 24a. Horizontal hole 27 opening in the outer periphery of
It is formed by:

A movement restricting surface 24b of the check valve 7 is provided above the vertical hole 24a in the suction passage 24, and the check valve 7 is formed of a plate. It is preferable that an auxiliary plate 8 having a smaller shape than the check valve 7 is interposed between the check valve 7 and the movement restricting surface 24b.

It is preferable that a projection 81 is provided on the upper surface of the auxiliary plate 8 to come into contact with the movement regulating surface 24b when the check valve 7 is opened.

[0011]

In the above-described scroll compressor, the check valve 7 provided in the suction passage 24 of the fixed scroll 2 is operated during operation.
The opening operation is performed by the pressure difference between the suction chamber 6 and the suction pipe 10, and gas is sucked from the suction pipe 10 into the suction chamber 6 through the suction passage 24, and the suction gas is provided to each of the scrolls 2 and 3. When the operation of the compressor is stopped, the gas supply from the suction pipe 10 to the suction passage 24 and the suction chamber 6 is stopped. , The check valve 7 is closed by its own weight, and the suction passage 24 is closed.
Of the high-pressure gas from the compression chamber side through the suction chamber 6 and the suction passage 24 to the suction pipe 10 side is prevented. That is, the opening and closing operation of the suction passage 24 by the check valve 7 is performed by using the self-weight of the check valve 7 and the pressure difference between the suction chamber 6 and the suction pipe 10 without using a spring as in the related art. Therefore, when gas is sucked from the suction pipe 10 into the suction passage 24 and the suction chamber 6 during the operation of the compressor, the check valve 7 applies a pressure loss to the suction gas. Without suction, the suction gas is smoothly sucked into the suction chamber 6, and the volumetric efficiency in the compression chamber is increased.

Further, in a horizontal scroll compressor in which the fixed scroll 2 and the movable scroll 3 are arranged in a horizontal direction, a vertical hole is formed so as to open into the suction chamber 6 vertically from below the fixed scroll 2. Since the suction passage 24 is provided, the structure of the suction passage 24 can be simplified, and the opening width of the suction passage 24 with respect to the suction chamber 6 is made smaller than the diameter of the suction passage 24. Since the check valve 7 is slidably provided in the opening of the suction passage 24 in the suction chamber 6, when the check valve 7 is opened and closed when the compressor is operating and when the compressor is stopped, The check valve 7 is guided by the suction passage 24 without using a special guide member or the like.
4 can be prevented, so that the structure of the suction passage 24 can be simplified, and the cost can be reduced.

Further, in the vertical scroll compressor in which the fixed scroll 2 and the movable scroll 3 are vertically arranged, the suction passage 24 is provided with the fixed scroll 2 and the movable scroll 3.
A partition 25 formed by the partition plate 13 on the upper surface of the fixed scroll 2, a vertical hole 24 a extending from the partition 25 in the thickness direction of the fixed scroll 2, the partition 25 and the suction chamber 6.
And a horizontal hole 27 opening from the lower end of the vertical hole 24a to the outer peripheral portion of the fixed scroll 2, so that the upper surface of the fixed scroll 2 is A heat insulating space can be formed on the side, so that the gas in the compression chamber is not overheated by the discharge gas discharged from the discharge port 20, and the performance can be improved.

A vertical hole 24 in the suction passage 24 is provided.
The check valve 7 is formed of a plate, and a movement regulating surface 24b of the check valve 7 is provided on the upper side of the check valve 7a.
The check valve 7 is provided between the upper surface of the
When the auxiliary plate 8 having a smaller shape is interposed, when the check valve 7 is closed from the open operation state, the check plate 7 may directly adhere to the movement restricting surface 24b with the auxiliary plate 8. Can be prevented, and even if the check valve 7 is attached to the auxiliary plate 8, since the auxiliary plate 8 is smaller in size than the check valve 7, the check valve 7 At the back side of the outer periphery of the auxiliary plate 8
4 by applying a back pressure to the check plate 7 from the auxiliary plate 8.
And the suction valve 24 can be closed by the check valve 7, so that the backflow of high-pressure gas from the compression chamber to the suction pipe 10 side can be prevented.

A projection 8 is provided on the upper surface of the auxiliary plate 8 so as to come into contact with the movement regulating surface 24b when the check valve 7 is opened.
1 is provided, the protrusion 81 of the auxiliary plate 8 is brought into contact with the movement restricting surface 24b when the check valve 7 is opened,
The entire surface of the auxiliary plate 8 can be prevented from sticking to the movement restricting surface 24b, so that the suction passage 24 can be properly closed by the check valve 7, and the suction pipe 10 can be removed from the compression chamber. Backflow of the high-pressure gas to the side can be prevented.

[0016]

FIG. 1 shows an open-type horizontal scroll compressor as a scroll compressor. A head plate 21 is provided in a horizontally long casing 1 to which a suction pipe 10 and a discharge pipe 11 are connected.
A movable scroll having a fixed scroll 2 having a spiral groove 22 and a spiral body 23 formed by the spiral groove 22 on one side surface, and a spiral body 32 fitted to the spiral groove 22 on one side surface of an end plate 31. 3 and these scrolls 2,
3 are overlapped with each other so that the spiral bodies 23 and 32 mesh with each other, and the winding end portions 23a and 3 of the spiral bodies 23 and 32 are overlapped.
On the 2a side, the spiral groove 22 and the end plate 31 of the movable scroll 3
Forms a suction chamber 6, while supporting a drive shaft 5 having an eccentric drive part 51 for mounting the frame 4 in the casing 1 and for orbiting the movable scroll 3 with respect to the fixed scroll 2. The other end of the drive shaft 5 is discharged outward from the casing 1 and is driven by an external drive source.

A discharge port 20 communicating with the spiral groove 22 is provided at the center of the end plate 21 of the fixed scroll 2 at the winding start side of the spiral body 23. A discharge chamber 1a in which the discharge port 20 opens is formed between the casing 1 and one end side wall.

In the above-described compressor, as shown in FIGS. 1 to 3, the fixed scroll 2 has a vertical hole 24a extending vertically from a lower side thereof and having an upper side communicating with the suction chamber 6. Is formed, and the suction pipe 10 is inserted into and connected to the vertical hole 24a constituting the suction passage 24.
4 is seated under its own weight on a valve seat surface 10a provided at the insertion end of the suction pipe 10 when the operation is stopped, and
a of a check valve 7 which closes the communication side of the suction chamber 6 with the suction chamber 6 and enables the vertical hole 24a to be opened to the suction chamber 6 by a pressure difference between the suction chamber 6 and the suction pipe 10 during operation. The suction passage 2 is movably provided.
The movement regulating surface 24b of the check valve 7 is formed on the upper surface side of the vertical hole 24a in FIG.

During the operation of the compressor, the pressure difference between the suction chamber 6 and the suction pipe 10 is utilized,
When the pressure on the suction pipe 10 side increases, the check valve 7 is moved upward to the movement restricting surface 24b, and the vertical hole 2
4a is opened to the suction chamber 6, gas is sucked from the suction pipe 10 into the suction chamber 6 through the suction passage 24, and the suction gas is compressed in the compression chamber b between the spiral bodies 23 and 32. The compressed gas is discharged from the discharge port 20 to the discharge chamber 1a through the oil separator 12 provided in the discharge chamber 1a, and discharged from the discharge pipe 11 to the outside.

When the operation of the compressor is stopped, the supply of gas from the suction pipe 10 to the suction passage 24 and the suction chamber 6 is stopped, so that the check valve 7 is closed by its own weight. The communication side of the vertical hole 24a to the suction chamber 6 is closed to prevent the backflow of the high-pressure gas from the compression chamber A to the suction pipe 10 through the suction chamber 6 and the suction passage 24. That is, the opening / closing operation of the check valve 7 is performed by the weight of the check valve 7 and the pressure difference between the suction chamber 6 and the suction pipe 10 without using a spring as in the related art. Accordingly, when the operation of the compressor is stopped, the backflow of the high-pressure gas from the compression chamber a to the suction pipe 10 can be prevented. When the gas is sucked into the chamber 6, the suction gas is smoothly sucked into the suction chamber 6 without giving pressure loss to the suction gas by the check valve 7, and the volume in the compression chamber A is increased. Efficiency is increased.

As shown in FIG. 5, the check valve 7 is formed of a disk-shaped plate, and the check valve 7 is provided on the upper surface side of the check valve 7 with the movement control surface 24b. As shown in FIG. 5, a disk-shaped auxiliary plate 8 having a smaller diameter than the check valve 7 is provided. That is, the diameter of the check valve 7 is φX, and the diameter of the auxiliary plate 8 is When φY, φX> φY
That is. When the operation is stopped, the check valve 7 is stopped.
When the valve is closed from the open state, the presence of the auxiliary plate 8 prevents the check valve 7 from directly sticking to the movement restricting surface 24b side. Even when the valve 7 is stuck, the auxiliary plate 8 has a smaller diameter than the check valve 7, and a back pressure on the suction passage 24 side is applied to the back side of the outer periphery of the auxiliary plate 8 in the check valve 7. As a result, the check valve 7 is easily peeled off from the auxiliary plate 8 by the back pressure, the suction passage 24 is closed by the check valve 7, and the suction chamber 10 is moved from the compression chamber A to the suction pipe 10 side. The backflow of the high pressure gas to the gas is prevented.

Further, a projection 81 is provided on the upper surface of the auxiliary plate 8 when the opening of the check valve 7 is in contact with the movement regulating surface 24b. When the stop valve 7 is opened, the entire surface of the auxiliary plate 8 is prevented from sticking to the movement restricting surface 24b, and the auxiliary plate 8 and the check valve 7 can satisfactorily close the suction passage 24. .

The vertical hole 24 in the suction passage 24
As shown in FIG. 4, an opening 24c that opens into the suction chamber 6 is formed on the upper side of the opening a. When the opening width of the opening 24c is L,
The opening width L is the diameter φd of the vertical hole 24a of the suction passage 24.
The diameter is made smaller than that, that is, L <φd. With the above configuration, when the check valve 7 is opened and closed along the suction passage 24 during the operation and the stop of the compressor, without using a special guide member or the like separately, The check valve 7 can be guided by the suction passage 24 to prevent the check valve 7 from jumping out of the suction passage 24.

Further, as shown in FIG. 3, when the check valve 7 and the auxiliary plate 8 are seated on the valve seat surface 10a of the suction pipe 10 inserted into the suction passage 24 when the operation is stopped. Assuming that the height from the auxiliary plate 8 to the movement restricting surface 24b is S, the height S is further larger than the diameter φY of the auxiliary plate 8 formed smaller in diameter than the diameter φX of the check valve 7. It is formed so as to be small, that is, so as to satisfy S <φY <φX. With this configuration, the check valve 7 and the auxiliary plate 8 are connected to the valve seat surface 10a of the suction pipe 10.
Of the suction passage 24 by the check valve 7 and the auxiliary plate 8 can be more favorably performed.

In the above embodiment, the horizontal type scroll compressor has been described. However, the present invention can be applied to a vertical type scroll compressor. Next, a vertical type scroll compressor will be described.

The vertical scroll compressor is basically the same as the horizontal scroll compressor described above. As shown in FIG.
A fixed scroll 2 having a spiral groove 22 and a spiral body 23 formed by the spiral groove 22 on one side surface;
A movable scroll 3 having a spiral body 32 fitted to the spiral groove 22 is disposed on one side surface of the movable scroll 3 so as to face up and down.
These scrolls 2 and 3 are connected to the spirals 23 and 32, respectively.
Are overlapped so as to mesh with each other, and the respective spiral bodies 23, 32
A suction chamber 6 is formed at the end of the winding end.
A frame 4 and a motor 9 are provided in the casing 1, and a drive shaft 5 extending from the motor 9 is connected to the movable scroll 3. Are made to orbit with respect to the fixed scroll 2.

Between the fixed scroll 2 and the top wall of the casing 1, there is provided a discharge chamber 1a in which the discharge port 20 is opened, and the discharge chamber 1a and a lower chamber of the casing 1 in the casing 1 below the frame 4. 1b is communicated with a communication passage (not shown) to open a discharge pipe 11 in the lower chamber 1b. In the center of the drive shaft 5, lubricating oil in an oil reservoir at the bottom of the casing 1 is supplied. Pumping oil supply passage 51
Is provided. In FIG. 6, reference numeral 40 denotes the oil supply passage 5.
Reference numeral 41 denotes an oil injection tube for supplying lubricating oil to the compression chamber A, by returning the lubricating oil supplied from 1 to the bearing portion and the like to the oil reservoir.

In the above-described vertical scroll compressor, the suction passage 24 for connecting the suction pipe 10 is provided on the upper surface of the fixed scroll 2 as shown in FIGS. A partition chamber 25 formed between a partition plate 13 made of a heat insulating material or the like and a concave portion formed on the upper surface of the fixed scroll 2, and provided in the vertical direction of the fixed scroll 2 from the partition chamber 25. A communication hole 26 provided at a position apart from the vertical hole 24a of the compartment 25 and communicating the compartment 25 with the suction chamber 6;
And a horizontal hole 27 opening from the lower end to the outer peripheral portion of the fixed scroll 2.

Then, the suction pipe 10 is connected to the horizontal hole 27, and the movement restricting surface 24b is formed on the upper wall surface of the compartment 25 facing the vertical hole 24a, that is, on the inner surface of the partition plate 13. At the same time, the check valve 7 which is closed by its own weight and opened by the pressure difference between the suction chamber 6 and the suction pipe 10 is provided above the vertical hole 24a in the compartment 25.

With the above configuration, during operation of the compressor, the suction pipe 10 side has a higher pressure than the suction chamber 6, and the pressure difference causes the check valve 7 to move upward to the movement regulating surface 24b. The suction passage 24 is moved
The vertical hole 24a is opened to the suction chamber 6, and the suction gas from the suction pipe 10 is sucked into the suction chamber 6 from the vertical hole 24a through the compartment 25 and the communication passage 26. , The check valve 7 is connected to the suction pipe 1.
0 and the pressure difference between the suction chamber 6 and the suction chamber 6, the check valve 7 does not give a pressure loss to the suction gas, and the suction gas flows from the vertical hole 24a and the compartment 25 into the suction chamber 6. , And the volumetric efficiency in the compression chamber A is increased. When the operation of the compressor is stopped, the supply of gas from the suction pipe 10 to the suction chamber 6 is stopped, so that the check valve 7 is closed by its own weight, and the vertical hole in the compartment 25 is closed. By closing the upper side of the suction chamber 24a, it is possible to prevent the high-pressure gas from flowing backward from the compression chamber A side to the suction pipe 10 side through the vertical hole 24a of the suction passage 24.

Further, in the vertical scroll compressor as described above, similarly to the above-described horizontal scroll compressor, the diameter of the check valve 7 is smaller than that of the check valve 7 above the check valve 7. An auxiliary plate 8 is provided to prevent the check valve 7 from directly sticking to the movement restricting surface 24b side with the auxiliary plate 8, and the check valve 7 is temporarily attached to the auxiliary plate 8. The auxiliary plate 8 in the check valve 7
A back pressure on the side of the compartment 25 is applied to the outer peripheral rear surface of the check plate 7 so that the check valve 7 is easily peeled off from the auxiliary plate 8 by the back pressure. The communication side to the suction chamber 6 is closed to prevent the backflow of the high-pressure gas from the compression chamber A to the suction pipe 10 side. Further, the upper surface of the auxiliary plate 8 is provided with the movement restricting surface 24 when the check valve 7 is opened, as described above.
b to prevent the entire surface of the auxiliary plate 8 from sticking to the movement restricting surface 24b when the check valve 7 is opened.
Thus, the suction passage 24 can be properly closed by the check valve 7.

Also, by forming the compartment 25 wide so as to extend in the circumferential direction as shown in FIG. 7, the compartment 25 can be used as a heat insulating space. Overheating of the gas in the compression chamber b due to the discharged gas can be reduced, and the performance can be improved.

[0033]

As described above, according to the present invention, the fixed scroll 2 is provided with the vertical hole 24a extending in the vertical direction, and the upper side of the vertical hole 24a is provided with the suction passage 24 communicating with the suction chamber 6. The suction pipe 10 communicates with the suction passage 24, and the vertical hole 24a is provided above the vertical hole 24a.
a closed by its own weight on the communication side to the suction chamber 6, and
Since the check valve 7 for opening the vertical hole 24a to the suction chamber 6 by the pressure difference between the suction chamber 6 and the suction pipe 10 is provided, the opening / closing operation of the suction passage 24 by the check valve 7 is performed as in the conventional case. Without using a spring, the operation can be performed by the weight of the check valve 7 and the pressure difference between the suction chamber 6 and the suction pipe 10. From suction passage 2
When the gas is sucked into the suction chamber 4 and the suction chamber 6, the check valve 7 can smoothly suck the suction gas into the suction chamber without giving a pressure loss to the suction gas,
Volumetric efficiency in the compression chamber can be increased.

In a horizontal scroll compressor in which the fixed scroll 2 and the movable scroll 3 are arranged in a horizontal direction, a vertical hole is formed so as to open vertically into the suction chamber 6 from below the fixed scroll 2. The suction passage 24 can be formed only by providing the suction passage 2.
4 can be simplified, and the opening width of the suction passage 24 to the suction chamber 6 is made smaller than the diameter of the suction passage 24, and the check valve is provided in the opening of the suction passage 24 in the suction chamber 6. By installing the valve 7 slidably, when the check valve 7 is opened and closed when the compressor is operating and when the compressor is stopped, the suction can be performed without using a special guide member or the like. Passage 24
The check valve 7 can be guided to prevent the check valve 7 from jumping out of the suction passage 24.
The structure of the suction passage 24 can be simplified, and the cost can be reduced.

Further, in a vertical scroll compressor in which the fixed scroll 2 and the movable scroll 3 are vertically arranged, the suction passage 24 is connected to the fixed scroll 2
A partition 25 formed by the partition plate 13 on the upper surface of the fixed scroll 2, a vertical hole 24 a extending from the partition 25 in the thickness direction of the fixed scroll 2, the partition 25 and the suction chamber 6.
And a horizontal hole 27 opening from the lower end of the vertical hole 24a to the outer peripheral portion of the fixed scroll 2 so that the upper side of the fixed scroll 2 can be Since the heat insulating space can be formed in the compression chamber, the overheating of the gas in the compression chamber by the discharge gas discharged from the discharge port 20 can be reduced, and the performance can be improved. .

The vertical hole 24 in the suction passage 24
The check valve 7 is formed of a plate, and a movement regulating surface 24b of the check valve 7 is provided on the upper side of the check valve 7a.
The check valve 7 is provided between the upper surface of the
When the check valve 7 is closed from the open operation state by interposing the auxiliary plate 8 having a smaller shape, the check valve 7 is directly stuck to the movement restricting surface 24b by the auxiliary plate 8. Can be prevented, and even if the check valve 7 is attached to the auxiliary plate 8, the check plate 8 is smaller than the check valve 7. 7, a back pressure on the suction passage 24 side is applied to the outer peripheral back side of the auxiliary plate 8 to separate the check valve 7 from the auxiliary plate 8 and close the suction passage 24 with the check valve 7. Therefore, backflow of the high-pressure gas from the compression chamber to the suction pipe 10 can be prevented.

Further, by providing a projection 81 on the upper surface of the auxiliary plate 8 for contacting the movement restricting surface 24b when the check valve 7 is opened, the auxiliary plate 8 is opened when the check valve 7 is opened. 8 can be made to abut on the movement restricting surface 24b to prevent the entire surface of the auxiliary plate 8 from sticking to the movement restricting surface 24b. Therefore, the closing of the suction passage 24 by the check valve 7 can be prevented. This can be performed well, and backflow of high-pressure gas from the compression chamber to the suction pipe 10 can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll compressor according to the present invention with a horizontal compressor partially omitted.

FIG. 2 is an enlarged side view illustrating a spiral groove side of a fixed scroll in the compressor, in which an upper half is omitted.

FIG. 3 is a half sectional view as seen from the direction of line XX in FIG. 2;

FIG. 4 is a cross-sectional view as seen from the direction of line YY in FIG. 2;

FIG. 5 is a plan view of a check valve and an auxiliary plate.

FIG. 6 is a cross-sectional view of the vertical scroll compressor with a part omitted.

FIG. 7 is a scaled plan sectional view showing a main part of a fixed scroll of the compressor.

FIG. 8 is a sectional view taken along line ZZ of FIG. 7;

FIG. 9 is a longitudinal sectional view of a conventional scroll compressor.

[Explanation of symbols]

 2 Fixed scroll 20 Discharge port 22 Spiral groove 23 Spiral body 24 Suction passage 24a Vertical hole 24b Movement regulating surface 25 Partition chamber 26 Communication passage 27 Side hole 3 Movable scroll 32 Spiral body 6 Suction chamber 7 Check valve 8 Auxiliary plate 81 Projection 10 Suction pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04C 18/02 311

Claims (5)

(57) [Claims] 1. A fixed scroll 2 having a spiral groove 22 and a spiral body 23, and a discharge port 20 on the winding start side of the spiral body 23.
A movable scroll 3 having a spiral body 32 fitted in the spiral groove 22 and orbiting with respect to the fixed scroll 2
A suction chamber 6 is provided at the end of the spiral of each of the spiral bodies 23, 32, and the suction pipe 1 is provided in the suction chamber 6.
0, wherein the fixed scroll 2 is provided with a vertical hole 24a extending in a vertical direction, and an upper side of the vertical hole 24a is provided with a suction passage 24 communicating with the suction chamber 6. The suction pipe 1 is provided in the suction passage 24.
0, and the side of the vertical hole 24a communicating with the suction chamber 6 is closed by its own weight above the vertical hole 24a, and the pressure difference between the suction chamber 6 and the suction pipe 10 causes the vertical hole 24a to communicate with the vertical hole 24a. A scroll compressor comprising a check valve 7 for opening 24a to a suction chamber 6. 2. A fixed scroll 2 and a movable scroll 3 are arranged in a horizontal direction, and a suction passage formed in the fixed scroll 2 and extending in a vertical direction from below the fixed scroll 2 and comprising a vertical hole opening to a suction chamber 6. 24, the opening width of the suction passage 24 with respect to the suction chamber 6 is made smaller than the diameter of the suction passage, and the check valve 7 is slidably housed in the opening of the suction passage 24 in the suction chamber 6. The scroll compressor according to claim 1. 3. A fixed scroll 2 and a movable scroll 3 are vertically arranged, and a suction passage 24 is formed in a partition chamber 2 formed by a partition plate 13 on an upper surface of the fixed scroll 2.
5, a vertical hole 24a extending from the compartment 25 in the thickness direction of the fixed scroll 2, a communication passage 26 communicating the compartment 25 with the suction chamber 6, and a fixed scroll from the lower end of the vertical hole 24a. 2 which is open on the outer periphery of 2
The scroll compressor according to claim 1, wherein the scroll compressor is formed by: 4. A check valve 7 is provided above the vertical hole 24a in the suction passage 24. The check valve 7 is formed of a plate, and the check valve 7 is formed of a plate. The scroll compressor according to claim 1, wherein an auxiliary plate (8) having a shape smaller than the check valve (7) is interposed between the scroll control surface (24b) and the movement restricting surface (24b). 5. The scroll compressor according to claim 4, wherein a projection 81 is provided on an upper surface of the auxiliary plate 8 to come into contact with the movement regulating surface 24b when the check valve 7 is opened.