JP3068384B2 - Horizontal 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 horizontal scroll compressor.

[0002]

2. Description of the Related Art A horizontal scroll compressor is used by being incorporated in a refrigerating apparatus or the like. A conventional horizontal scroll compressor will be described with reference to FIG. FIG. 2 shows the entire scroll compressor. In FIG. 2, a housing 1 is provided horizontally, and the inside of the housing 1 is covered with a high-pressure space 3 by a discharge cover 2.
And a low-pressure space 4. A scroll-type compression mechanism C is provided in the left part of the low-pressure space 4 in the figure, an electric motor M is provided in the center, and an oil pump P is provided in the right part of the low-pressure space 4. , The electric motor M and the oil pump P are connected by a rotating shaft 5 provided on the electric motor M.

An electric motor M includes a stator 6 fixed to the sealed housing 1 and a rotor 7 combined inside the stator 6.
And a rotating shaft 5 inserted through and fixed to the rotor 7.
The rotating shaft 5 extends to both ends of the rotor 7. The rotating shaft 5 is supported by casings 20 and 27 provided inside the housing 1.

The scroll type compression mechanism C has a fixed scroll 8 and an orbiting scroll 9. The fixed scroll 8 includes an end plate 10 and a spiral wrap 11, and a discharge port 12 is provided at a central portion along a lateral direction. Is provided. The orbiting scroll 9 includes an end plate 13 and a spiral wrap 14, and a bush 16 is provided inside a boss 15 provided on a side portion of the end plate 13.
Are rotatably fitted via a bearing 17, and an eccentric shaft 18 provided at the end of the rotating shaft 5 is slidably inserted into the bush 16.

The fixed scroll 8 and the orbiting scroll 9 have a plurality of closed spaces in which the end plates 10 and 13 are eccentric by a predetermined distance and the wraps 11 and 14 are combined with each other at an angle of 180 degrees. 19 are formed. The orbiting scroll 9 is slidably supported by a casing 20 fixed inside the hermetically sealed housing 1, and between the orbiting scroll 9 and the casing 20, a revolving orbiting motion of the orbiting scroll 9 is allowed but rotation is prevented. A rotation prevention mechanism 21 is provided.

The outer periphery of the end plate 10 of the fixed scroll 8 is supported by a casing 20, and a projection 22 is formed at the center of the end plate 10 of the fixed scroll 8, and the projection 22 is formed on the discharge cover 2. It is supported by the hole 23. A gas suction pipe 24 is provided in the low pressure space 4 of the sealed housing 1, and a gas discharge pipe 25 is provided in the high pressure space 3.

Further, the discharge cover 2 allows the gas to be discharged from the discharge port 12 to the high-pressure space 3 when the compression mechanism C is operating, and allows the gas to be discharged from the high-pressure space 3 when the driving of the compression mechanism C is stopped. A check valve 41 for preventing reverse flow of gas to the discharge port 12 to prevent reverse rotation of the orbiting scroll 9 due to reverse flow of gas, that is, to prevent the orbiting scroll 9 from rotating in a direction to expand a closed space between the scroll and the fixed scroll. Is provided.

That is, a circular through hole 26 is formed in the center of the discharge cover 2, and a horizontally disposed holding cylinder 42 is provided in the hole 26, and a valve element 43 is provided inside the holding cylinder 42. Thus, a check valve 41 is configured.

The holding cylinder 42 has a cylindrical shape with both ends open, and has an upstream end formed with a through hole 2 of the discharge cover 2.
6, the upstream end opening of the holding cylinder 42 communicates with the discharge port 12 of the fixed scroll 8. Holding cylinder 42
Downstream end of the housing 1 projects into the high-pressure space 3 of the housing 1, and a downstream end thereof is formed with a gap for discharging gas to an end plate of the housing 1. The gap prevents the valve element 43 from coming off.

The valve body 43 has a spherical shape, and its diameter is smaller than the inner diameter of the holding cylinder 42 and is fixed so as to form a gas flow gap between the valve body 43 and the inner surface of the holding cylinder 42. The scroll 8 has such a size that the discharge port 12 of the scroll 8 can be closed. The valve body 43 is a holding cylinder 42
The holding cylinder 42 is provided movably in the axial direction inside the
Of the discharge port 12
And moves toward the downstream end to open the discharge port 12.

In the horizontal scroll compressor constructed as described above, the check valve 41 is provided when the compression mechanism C is not driven.
The valve element 43 contacts the side surface of the end plate 10 of the fixed scroll 8 to close the discharge port 12.

When the compression mechanism C is driven, the rotation shaft 5 is rotated by driving the motor M, and this rotation is transmitted to the orbiting scroll 9 of the compression mechanism C via the eccentric shaft 18, the bush 16 and the boss 15. You. The orbiting scroll 9 performs a revolving orbiting motion on a circular orbit having a revolving orbital radius while being prevented from rotating by the rotation preventing mechanism 21.

Then, the gas enters the low-pressure space 4 of the sealed housing 1 via the suction pipe 24, and then the compression mechanism C
Is sucked into the closed section 19. Then, as the volume of the closed space 19 decreases due to the revolving orbiting motion of the orbiting scroll 9, the gas reaches the center while being compressed.

Here, the gas enters the discharge port 12 of the fixed scroll 8 and presses the valve body 43 provided inside the holding cylinder 42 of the check valve 41 in a direction away from the discharge port 12 by the pressure. The valve body 43 moves inside the holding cylinder 42 from the upstream end to the downstream end. This allows the discharge port 1
2 is opened and gas is discharged from the discharge port 12 into the holding cylinder 42.

The gas discharged from the discharge port 12 enters the inside of the holding cylinder 42 and is discharged into the holding cylinder 42 from the downstream end opening into the high-pressure space 3. The gas flowing into the high pressure side space 3 is
The liquid is discharged to the outside through the line 5.

When the driving of the compression mechanism C is stopped, the valve body 43
Moves from a position distant from the discharge port 12 and moves inside the holding tube 12 toward the discharge port 12 so as to contact the side surface of the end plate 10 of the fixed scroll 8 in which the discharge port 12 is formed.

Further, an oil pump P incorporated in a lower portion inside the housing 1 is formed on the rotating shaft 5 by being rotationally driven by the rotating shaft 5 and sucking the lubricating oil accumulated at the bottom inside the housing 1. It is supplied to the sliding part of the compression mechanism C through the hole 5a.

[0018]

The check valve provided in the above-mentioned horizontal scroll compressor has the following problems. This problem is caused by the holding cylinder 4 in the check valve 41.
2 is a positional relationship with respect to a horizontal line.

That is, in the conventional check valve 41, the holding cylinder 4
2 is provided so that the central axis is inclined with respect to the horizontal line so that the downstream end faces upward, and the valve element 43 provided inside the holding cylinder 42 is brought into contact with the surface of the fixed scroll 8 by the inclination of the holding cylinder 42. There is a configuration that employs a configuration in which the discharge port 12 is closed by contact.

In this configuration, the valve body 43 moves due to the inclination of the holding cylinder 42 and comes into contact with the side surface of the fixed scroll 8 to close the discharge port 12.
The original valve operation of the check valve, that is, the prevention of the backflow of the gas to the valve, is performed. However, in this configuration, a force is always applied to the valve body 43 toward the upstream end, that is, toward the surface of the fixed scroll 8 due to the inclination of the holding cylinder 42. After the valve 43 is pushed up by the gas discharged from the discharge port 12 and moved in a direction away from the discharge port 12, the valve body 43 descends and collides with the surface of the fixed scroll 8 to generate an abnormal sound. May cause noise.

In order to solve this problem, it is conceivable to provide the holding cylinder 42 with its central axis inclined with respect to a horizontal line so that the downstream end faces downward. However, in this configuration, since a force always acts on the valve body 43 toward the downstream end, that is, in a direction away from the surface of the fixed scroll 8, the driving of the compression mechanism C is stopped and the compression mechanism C becomes negative pressure. When a differential pressure is generated between the upstream side and the downstream side of the check valve, that is, between the compression mechanism C and the high-pressure space 3, the valve body 43
Cannot move toward the upstream end of the holding cylinder 42, that is, the side surface of the fixed scroll 8.
2, the backflow of gas from the high-pressure space 3 to the compression mechanism C cannot be prevented, and there is a problem that the orbiting scroll 9 of the compression mechanism C rotates in the reverse direction.

Conventionally, no measures have been taken against such a problem, and there has been a demand for a solution to this problem.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a horizontal scroll compressor including a check valve that performs a valve operation quietly and reliably.

[0023]

In order to achieve the above object, a horizontal scroll type compressor according to the present invention reduces the area of an enclosed space formed by combining a fixed scroll and an orbiting scroll with each other while reducing the area thereof. A horizontal scroll-type compressor that moves toward the center of the scroll to compress the gas and discharges this gas to the outside through a discharge port formed in the one scroll and a check valve communicating with the discharge port. The check valve is provided with a horizontally disposed holding cylinder communicating with the discharge port, and movably provided inside the holding cylinder according to a differential pressure between an upstream side and a downstream side of the check valve. And a valve body that opens and closes the discharge port by moving the orbiting scroll, and the differential pressure between the upstream side and the downstream side of the check valve when the orbiting scroll is driven is ΔPD,
The pressure difference between the upstream side and the downstream side of the check valve when gas is flowing backward immediately after the driving of the orbiting scroll is stopped is ΔPS, the weight of the valve body is m, the pressure receiving area of the valve body. Is A, and the angle of the holding cylinder with respect to the horizontal line is φ, ΔPD · A> m · tan φμ, ΔPS · A> m · tan
The holding cylinder is provided with its downstream end facing upward within a range of φd, φμ>φ> φd.

[0024]

The holding cylinder in the check valve is provided at an angle with respect to the horizontal line within the range defined by the above equation, so that when the compression mechanism becomes a negative pressure, the valve body moves inside the holding cylinder. To close the discharge port of the scroll and reliably perform the valve operation to prevent the backflow of gas from the high-pressure space to the compression mechanism, and the valve body hits the scroll surface while driving the compression mechanism, generating abnormal noise. It can be prevented from occurring.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The horizontal scroll compressor shown in FIG. 1 is based on the horizontal scroll compressor shown in FIG. 2, and the same parts as those in FIG. 2 are denoted by the same reference numerals.

That is, in this embodiment, the check valve 41
Is a holding cylinder 42 which is provided laterally in the hole 30 of the discharge cover 2 and is open at both ends, and a spherical valve body 43 which is provided inside the holding cylinder 42 so as to be movable in its axial direction.
It is composed of

In the check valve 41 of this embodiment, the holding cylinder 42
Are arranged so that their central axes are at an angle φ with respect to the horizontal line and their downstream ends are upward. The inclination angle φ of the holding cylinder 42 is set in the range described below.

That is, the holding cylinder 42 reduces the pressure difference between the upstream and downstream sides of the check valve 41 when the orbiting scroll 9 is driven by ΔPD, and the gas flows backward immediately after the orbiting scroll 9 is stopped. When the differential pressure between the upstream side and the downstream side of the check valve 41 is ΔPS, the weight of the valve body 43 is m,
When the pressure receiving area of the valve element 43 is A, ΔPD · A> m · t
anφμ, ΔPS ・ A> m ・ tanφd, φμ>φ> φ
It is provided with the downstream end of the holding cylinder 42 facing upward in the range of d.

In the check valve 41 having this structure, the holding cylinder 42 is provided at an angle φ in the above-mentioned range with respect to the horizontal line so as to be inclined so that the downstream end faces upward. Is stopped and the compression mechanism C becomes negative pressure, and when a differential pressure is generated between the upstream side and the downstream side of the check valve 41, that is, between the compression mechanism C and the high-pressure space 3, the valve element 43
Moves toward the upstream end of the holding cylinder 42, that is, toward the surface of the fixed scroll 8, and reliably closes the discharge port 12. Therefore, backflow of gas from the high-pressure space 3 to the compression mechanism C can be prevented, Can be prevented from causing the orbiting scroll 9 of the compression mechanism C to rotate in the reverse direction due to the reverse flow of.

That is, when the driving of the compression mechanism C is stopped and the pressure of the compression mechanism C becomes negative, and a pressure difference is generated between the compression mechanism C and the high-pressure space 3, the valve element 43 moves to fix the fixed scroll. 8, the discharge port 12 is closed to close the discharge port 12, thereby preventing the reverse flow of gas from the high-pressure space 3 to the compression mechanism C, thereby ensuring the original valve operation of the check valve.

In addition, in the check valve 41 having this structure, the holding cylinder 42 is provided at an angle φ in the above-mentioned range with respect to the horizontal line so as to be inclined so that the downstream end faces upward. During the driving of the valve body 43, the valve body 43 is pushed up by the gas discharged from the discharge port 12, moved in a direction away from the discharge port 12, and held at that position,
Therefore, it is possible to prevent the problem that the valve body 43 descends and collides with the surface of the fixed scroll 8 to generate an abnormal sound and cause noise.

As described above, in the present invention, the holding cylinder 42 of the check valve 41 is provided at an angle with respect to the horizontal line within the range defined by the above-described formula, so that the compression mechanism C is provided.
When the pressure becomes negative, the valve body 43 moves inside the holding cylinder 42, closes the discharge port 12 of the fixed scroll 8, and reliably performs the valve operation for preventing the reverse flow of gas from the high pressure space 3 to the compression mechanism C. In addition, it is possible to prevent the valve 43 from hitting the surface of the fixed scroll 7 and generating an abnormal sound while the compression mechanism C is being driven. The present invention is not limited to the above-described embodiment, but can be implemented with various modifications.

[0033]

As described above, according to the present invention, it is possible to obtain a horizontal scroll compressor provided with a check valve which is silent and performs valve operation reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of a horizontal scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a conventional horizontal scroll compressor.

[Explanation of symbols]

1 ... housing 8 ... fixed scroll, 9 ...
Orbiting scroll, 12: discharge port, 41: check valve, 42: holding cylinder, 43: valve body.

Claims (1)

(57) [Claims] 1. A closed space formed by combining a fixed scroll and an orbiting scroll with each other is moved toward the center of both scrolls while reducing the area thereof to compress gas, and the gas is compressed by the one of the two scrolls. In a horizontal scroll compressor that discharges to the outside via a discharge port formed in a scroll and a check valve communicating with the discharge port, the check valve includes a horizontally disposed holding cylinder that communicates with the discharge port. And a valve body movably provided inside the holding cylinder and moving in accordance with a pressure difference between an upstream side and a downstream side of the check valve to open and close the discharge port. The differential pressure between the upstream side and the downstream side of the check valve when is driven is ΔPD, and the upstream side of the check valve when the gas is flowing backward immediately after the driving of the orbiting scroll is stopped. And downstream .DELTA.PS, the pressure of the valve body is m, the pressure receiving area of the valve body is A, and the angle of the holding cylinder with respect to the horizontal line is .phi., .DELTA.PD.A> m.tan.phi., .DELTA.PS.A> m-tan
A horizontal scroll type compressor, wherein the holding cylinder is provided with its downstream end facing upward within a range of φd, φμ>φ> φd.