WO2017150602A1

WO2017150602A1 - Compressor

Info

Publication number: WO2017150602A1
Application number: PCT/JP2017/008085
Authority: WO
Inventors: 創佐藤; 央幸木全; 洋悟高須; 一樹高橋
Original assignee: 三菱重工サーマルシステムズ株式会社
Priority date: 2016-03-04
Filing date: 2017-03-01
Publication date: 2017-09-08
Also published as: CN108474378B; JP2017155719A; CN108474378A; EP3382205B1; EP3382205A4; JP6710545B2; EP3382205A1

Abstract

This hermetic scroll compressor comprises: a hermetic housing; a scroll compressing mechanism housed in the hermetic housing; a discharge cover (3) provided with a discharge port (29) through which a refrigerant compressed by the scroll compressing mechanism passes; a discharge chamber formed between the hermetic housing and the discharge cover (3); an injection tube (50) provided so as to be passed inside the discharge chamber, and within which the refrigerant flows; and a reed valve (40) that is provided to the discharge port (29) of the discharge cover (3), and that is configured such that the refrigerant discharged from the discharge port (29) to the discharge chamber is ejected in a direction separating from the injection tube (50).

Description

Compressor

The present invention relates to a compressor.

The closed scroll compressor is used, for example, in a refrigeration system, an air conditioner, etc., and compresses and discharges a refrigerant supplied from the outside.
In the closed scroll compressor, a discharge chamber is formed above the scroll compression mechanism in a closed housing. The discharge chamber is a space surrounded by the scroll type compression mechanism and the housing, and the refrigerant compressed by the compression mechanism is supplied to temporarily store the refrigerant, and then discharge the refrigerant from the discharge pipe to the outside.

Patent Documents 1 and 2 listed below disclose that, in a scroll compressor, an injection pipe for introducing a refrigerant at an intermediate pressure from the outside into the compression chamber of the compression mechanism is provided. By supplying the liquid refrigerant to the compression chamber through the injection pipe, the temperature of the refrigerant is reduced by the latent heat when the liquid refrigerant evaporates, and the inside of the compression chamber is cooled.

In addition, in the scroll compressor, a volume control pipe (hereinafter referred to as a "bypass pipe") may be provided to extract the refrigerant at an intermediate pressure of the compression chamber to the outside. The medium pressure refrigerant extracted to the outside is returned to the suction side of the compressor. This enables capacity control operation of the compressor.

JP, 2009-287512, A JP, 2015-113817, A

An injection pipe and a bypass pipe provided in the hermetic scroll compressor are provided through the upper portion of the housing and the discharge chamber, and are connected to the compression mechanism. Therefore, the refrigerant passing through the injection pipe and the bypass pipe is heated by the high temperature refrigerant in the discharge chamber. In particular, as shown in FIG. 6 and FIG. 7, when the refrigerant discharged from the discharge port 29 is installed toward the injection pipe 50 or the bypass pipe by the reed valve 40, the injection pipe 50 or the bypass pipe The passing refrigerant is likely to be heated. When the refrigerant passing through the injection pipe is heated, there arises a problem that the inside of the compression chamber can not be cooled, and when the refrigerant passing through the bypass pipe is heated, the volume of the refrigerant increases and the compression efficiency decreases. Problems arise and in each case the desired performance of the compressor is not obtained.

The present invention has been made in view of such circumstances, and it is possible to suppress the temperature rise of the refrigerant passing through a pipe section such as an injection pipe and a bypass pipe installed inside the discharge chamber. The purpose is to provide a machine.

In order to solve the above-mentioned subject, a compressor of the present invention adopts the following means.
That is, the compressor according to one aspect of the present invention includes a housing, a scroll-type compression mechanism housed in the housing, and a discharge cover or the discharge cover provided with a discharge port through which the refrigerant compressed by the compression mechanism passes. A fixed scroll of a compression mechanism, a discharge chamber formed between the housing and the discharge cover or the fixed scroll, a piping portion which passes through the discharge chamber and through which the refrigerant flows; And a reed valve provided at the discharge port of the discharge cover or the fixed scroll and having a configuration in which the refrigerant discharged from the discharge port to the discharge chamber is blown out in a direction away from the piping portion.

According to this configuration, the refrigerant compressed by the compression mechanism is formed between the housing and the discharge cover or between the housing and the fixed scroll of the compression mechanism from the discharge port provided in the discharge cover or the fixed scroll of the compression mechanism. It is discharged into the discharge chamber. At this time, the refrigerant discharged from the discharge port to the discharge chamber is blown out in the direction away from the piping portion by the reed valve provided at the discharge port. Therefore, since the high temperature refrigerant discharged from the discharge port does not directly go to the piping part at the shortest distance, the refrigerant passing through the piping part is not easily heated.

In the above aspect, the reed valve may have a plate-like member that blows out the refrigerant discharged from the discharge port in a predetermined blowing direction, and the piping portion may be provided on the rear side in the blowing direction.

According to this configuration, the refrigerant discharged from the discharge port is blown out in the predetermined blowing direction by the plate-like member of the reed valve. Then, since the piping portion is provided on the rear side in the predetermined blowing direction of the refrigerant, the refrigerant discharged from the discharge port to the discharge chamber does not directly go to the piping portion, so the refrigerant passing through the piping portion is heated Hateful.

In the above aspect, the plate-like member of the reed valve is long in one direction, one end thereof is fixed to the discharge cover or the fixed scroll, and the other end can be opened and closed with respect to the discharge port. The line connecting the one end and the other end and the line connecting the discharge port and the piping portion may be 90 ° or less.

In the above aspect, the plate-like member of the reed valve is long in one direction, one end is fixed to the discharge cover or the fixed scroll, the other end can be opened and closed with respect to the discharge port, and the discharge port is When the reed valve is provided at two places, one at each of the discharge ports, the plate-like members of the two reed valves may be installed so as to sandwich the pipe portion.

In the above-mentioned mode, the above-mentioned piping part may be installed on a perpendicular bisector of a line segment which connects two above-mentioned discharge mouths.

In the above aspect, the angle formed by the line connecting the one end and the other end of one plate member and the line connecting the one end and the other end of the other plate member may be 90 ° or less.

In the above aspect, the discharge valve further includes a discharge pipe installed through the housing and discharging the refrigerant in the discharge chamber to the outside, and the refrigerant discharged from the discharge port to the discharge chamber is discharged by the reed valve. The discharge pipe may be installed so as to blow out in a direction approaching the pipe.

In the above aspect, the discharge valve further includes a discharge pipe installed through the housing and discharging the refrigerant in the discharge chamber to the outside, and the refrigerant discharged from the discharge port to the discharge chamber is discharged by the reed valve. The discharge pipe is installed so as to be blown out in a direction approaching the pipe, and the discharge pipe is installed on the opposite side of the piping section with a line connecting the two discharge ports interposed therebetween. It is also good.

According to the present invention, it is possible to suppress the temperature rise of the refrigerant passing through the piping portion such as the injection pipe and the bypass pipe, which is installed inside the discharge chamber.

It is a longitudinal section showing a scroll type compressor concerning one embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional view which shows the scroll-type compressor which concerns on one Embodiment of this invention. It is a schematic cross-sectional view which shows the scroll-type compressor which concerns on one Embodiment of this invention, and has shown the case where only one discharge port is provided. It is a schematic cross-sectional view which shows the scroll-type compressor which concerns on one Embodiment of this invention, and has shown the case where two discharge ports are provided. It is a schematic longitudinal cross-sectional view which shows the modification of the scroll-type compressor which concerns on one Embodiment of this invention. It is a schematic cross-sectional view which shows the comparative example of a scroll-type compressor, and has shown the case where only one discharge port is provided. It is a schematic cross-sectional view which shows the comparative example of a scroll type compressor, and has shown the case where two discharge ports are provided. It is a schematic cross-sectional view which shows the comparative example of a scroll type compressor, and has shown the case where two discharge ports are provided. It is a schematic cross-sectional view which shows the comparative example of a scroll type compressor, and has shown the case where two discharge ports are provided.

Hereinafter, a sealed scroll compressor according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a hermetic scroll compressor 1 as a scroll fluid machine includes a vertically elongated cylindrical hermetic housing 2 whose bottom is sealed by a lower cover. The upper portion of the sealed housing 2 is sealed by a discharge cover 3 and an upper cover 4, and a discharge chamber 5 is formed between the discharge cover 3 and the upper cover 4 for discharging a compressed high-pressure gas. .

An upper bearing member (frame member) 6 is fixedly installed at the upper portion in the sealed housing 2, and the scroll compression mechanism 7 is incorporated via the upper bearing member 6, and the stator 8 and the rotor 9 are formed at the lower portion. An electric motor 10 is provided. The electric motor 10 is incorporated by the stator 8 being fixedly installed in the closed housing 2, and the crankshaft 11 is fixed to the rotor 9.

At the upper end of the crankshaft 11, a crank pin 12 whose axis is eccentric by a predetermined dimension is provided, and the scroll compression mechanism 7 is driven by the electric motor 10 by connecting the crank pin 12 to the scroll compression mechanism 7. It is made possible. The upper portion of the crankshaft 11 is rotatably supported by the journal bearing portion 6A of the upper bearing member 6, and the lower end portion is rotatably supported by the lower journal bearing 13 provided at the lower portion of the sealed housing 2. ing.

Between the lower journal bearing 13 and the lower end of the crankshaft 11, a positive displacement oil supply pump 14 is provided, and the lubricating oil 15 filled in the bottom of the sealed housing 2 is sucked through the suction pipe 16 It is configured to discharge into a flow passage 17 which is bored in the shaft 11 along the axial direction. The lubricating oil 15 can be supplied to a portion requiring lubrication such as the upper bearing member 6, the scroll compression mechanism 7 and the lower journal bearing 13 through the flow passage 17.

The scroll compression mechanism 7 has the upper bearing member 6 as one component, and is slidably supported by the fixed scroll 18 fixedly installed on the upper bearing member 6 and the thrust bearing portion 6B of the upper bearing member 6 Is interposed between the upper bearing member 6 and the orbiting scroll 19 so as to prevent rotation of the orbiting scroll 19 and to rotate the orbiting orbit. The rotational force of the crankshaft 11 is provided to the orbiting scroll 19 provided between the rotation preventing mechanism 21 such as an acceptable Oldham ring, and the bearing boss 19C provided on the crank pin 12 of the crankshaft 11 and the back surface of the orbiting scroll 19. Of the fixed scroll 18 is provided with a drive bush 22 and a pivot bearing (needle bearing) 23 for It is installed on the upper bearing member 6 in a state connected to the scan charge cover 3.

The fixed scroll 18 includes an end plate 18A and a spiral wrap 18B erected on the end plate 18A. A discharge port 24 is provided at the center of the end plate 18A, and wrap teeth of the spiral wrap 18B are provided. The tip seal 25 is installed on the front surface. The orbiting scroll 19 also includes an end plate 19A and a spiral wrap 19B erected on the end plate 19A. A bearing boss 19C is provided on the back of the end plate 19A, and the wrap of the spiral wrap 19B is provided. The tip seal 26 is installed on the tooth tip surface.

The scroll compression mechanism 7 opens the refrigerant gas sucked into the sealed housing 2 through the suction pipe 27 opened at a position facing the stator winding 8A of the electric motor 10 into the sealed housing 2. It is drawn into the compression chamber 20 from the suction port 28 and compressed into a high temperature and high pressure gas. The compressed gas is discharged into the discharge chamber 5 through the discharge port 24 provided at the center of the fixed scroll 18 and the discharge port 29 provided to the discharge cover 3, and is further connected to the discharge chamber 5. It is sent to the outside of the compressor through the discharge pipe 30 which

In the present embodiment, an injection pipe 50 for introducing a refrigerant at an intermediate pressure into the compression chamber 20 of the scroll compression mechanism 7 from the outside is provided. By supplying the liquid refrigerant to the compression chamber 20 via the injection pipe 50, the temperature of the refrigerant can be lowered by the latent heat when the liquid refrigerant evaporates, and the inside of the compression chamber 20 can be cooled. The injection pipe penetrates the closed housing 2 and the discharge chamber 5 and is connected to the fixed scroll 18.

The reed valve 40 is a thin plate member and is provided at the outlet of the discharge port 29 to open and close the discharge port 29. The reed valve 40 regulates the flow of the refrigerant in only one direction. By providing the reed valve 40, in the present embodiment, the refrigerant flows only from the compression chamber 20 to the discharge chamber 5 side.

Above the reed valve 40, a retainer 41 for limiting the movable range (the upper limit of the opening degree) of the reed valve 40 is provided. When the reed valve 40 opens, the reed valve 40 contacts the lower surface of the retainer 41, whereby the retainer 41 can be regulated so that the reed valve 40 does not open too much. The retainer 41 is a highly rigid member that is unlikely to be deformed.

The reed valve 40 is a member which is long in one direction, and its end has, for example, an arc shape. One end side of the reed valve 40 is fixed to the discharge cover 3 by a bolt 42, and the other end side of the reed valve 40 can be opened and closed with respect to the discharge port 29. Similarly to the reed valve 40, the retainer 41 is a member which is long in one direction, and one end side thereof is fixed together with the reed valve 40 by a bolt 42 on the upper side of the reed valve 40.

Thereby, the reed valve 40 blows out the refrigerant discharged from the discharge port 29 in a predetermined blowing direction. The predetermined blowing direction is the front of the center of the circle of the discharge port 29 having a circular shape, assuming that the movable side opposite to the side fixed by the bolt 42 is the front. The refrigerant flowing to the rear side with respect to the center of the discharge port 29 is also smaller than the amount flowing to the front.

In the present embodiment, the reed valve 40 is attached to the discharge cover 3 so that the refrigerant discharged from the discharge port 29 to the discharge chamber 5 is blown out in the direction away from the injection pipe 50. For example, the injection pipe 50 is provided on the rear side in the blowing direction of the refrigerant from the discharge port 29, and the refrigerant is blown out in the direction away from the injection pipe 50.

Thus, the refrigerant is blown out in the direction away from the injection pipe 50 by the reed valve 40 provided at the discharge port 29. Therefore, since the high temperature refrigerant discharged from the discharge port 29 does not directly go to the piping portion at the shortest distance, the refrigerant passing through the injection pipe 50 is hardly heated.

When only one discharge port 29 is formed in the discharge cover 3, as shown in FIG. 3, a line connecting one end and the other end of the reed valve 40 which is a plate-like member, the discharge port 29 and the injection pipe 50 The connecting line is desirably less than 90 °, preferably not more than 60 °. As a result, the injection pipe 50 is provided at the rear side in the blowout direction of the refrigerant from the discharge port 29, and the refrigerant is reliably blown out in the direction away from the injection pipe 50. In addition, illustration of the retainer 41 is abbreviate | omitted in FIG.

As shown in FIG. 2 and FIG. 4, when discharge ports 29 are formed in two places in the discharge cover 3 and one reed valve 40 is provided in each discharge port 29, two reed valves 40 which are plate-like members are provided. Are installed so as to sandwich the injection pipe 50. As a result, the injection pipe 50 is provided at the rear side in the blowout direction of the refrigerant from the two discharge ports 29, and the refrigerant is blown out in the direction away from the injection pipe 50. In addition, illustration of the retainer 41 is abbreviate | omitted in FIG.

That is, as shown in FIGS. 8 and 9, unlike the case where only one discharge port 29 is formed in the discharge cover 3, a line connecting one end and the other end of the reed valve 40, the discharge port 29 and the injection pipe 50. It is difficult to make the line connecting them less than 90 °. Even if the line connecting one end and the other end of the reed valve 40 and the line connecting the discharge port 29 and the injection pipe 50 can be 90 °, the refrigerant blown out from the discharge port 29 may possibly hit the injection pipe 50 is there. 8 shows the case where two reed valves are fixed on the same side with respect to the discharge port 29, and FIG. 9 shows the case where two reed valves are fixed on different sides with respect to the discharge port 29. There is.

As shown in FIG. 4, when the two reed valves 40 are installed to sandwich the injection pipe 50, the injection pipe 50 is installed on a perpendicular bisector of a line connecting the two discharge ports 29. . With such an arrangement relationship, the two reed valves 40 can be installed so as to sandwich the injection pipe 50, and the refrigerant is blown out in the direction away from the injection pipe 50.

For the two reed valves 40, as shown in FIG. 4, the angle between the line connecting one end and the other end of one reed valve 40 and the line connecting the one end and the other end of the other reed valve 40 is 90 It is desirable that it is less than or equal to °. Thus, the refrigerant can be blown out in the direction away from the injection pipe 50 without the refrigerants blown out from the two discharge ports 29 interfering with each other.

As described above, according to the present embodiment, since the refrigerant blown out from the discharge port 29 does not directly hit the injection pipe 50, the refrigerant flowing inside the injection pipe 50 is not easily heated. As a result, the inside of the compression chamber 20 is appropriately cooled by the refrigerant that passes through the injection pipe 50 and is supplied to the compression chamber 20, and the performance degradation of the hermetic scroll compressor 1 can be prevented.

In the above description, the relationship between the discharge direction of the refrigerant blown out from the discharge port 29 regulated by the reed valve 40 and the position of the injection pipe 50 has been described, but the position of the discharge pipe 30 installed in the housing is further considered You may

That is, the discharge pipe 30 is installed such that the refrigerant discharged from the discharge port 29 to the discharge chamber 5 is blown out by the reed valve 40 in the direction approaching the discharge pipe 30. That is, the discharge pipe 30 is provided on the front side in the blowing direction of the refrigerant from the discharge port 29. As a result, the amount of the refrigerant discharged from the discharge port 29 toward the injection pipe 50 decreases, and the refrigerant flowing inside the injection pipe 50 becomes less likely to be heated.

When discharge ports 29 are formed at two locations in discharge cover 3 and one reed valve 40 is provided for each discharge port 29, discharge pipe 30 is provided with injection via a line connecting two discharge ports 29. It is provided on the opposite side to the tube 50. Preferably, the discharge pipe 30 is disposed on a vertical bisector of a line connecting two discharge ports 29. As a result, the amount of the refrigerant discharged from the discharge port 29 toward the injection pipe 50 is surely reduced, and the refrigerant flowing inside the injection pipe 50 is less likely to be heated.

Further, in the above description, the case where the injection pipe 50 is installed has been described, but in the case where a bypass pipe is provided instead of the injection pipe 50 in the enclosed scroll compressor 1, discharge is achieved by the same arrangement relationship. The refrigerant blown out from the port 29 can be prevented from directly impinging on the bypass pipe. As a result, since the refrigerant flowing in the bypass pipe is not heated, the refrigerant passes through the bypass pipe and is returned to the inside of the hermetic scroll compressor 1 without increasing the volume of the refrigerant. Also in this case, it is possible to prevent the performance of the hermetic scroll compressor 1 from being degraded.

In the embodiment described above, the case where the reed valve 40 is installed for the discharge port 29 formed in the discharge cover 3 has been described, but the present invention is not limited to this example. That is, in the case where the discharge cover 3 is not provided, the reed valve 40 may be installed to the discharge port 24 formed in the fixed scroll 18 as shown in FIG. 5. Also in this case, the reed valve 40 is installed based on the relationship between the blowing direction of the refrigerant blown out from the discharge port 24 regulated by the reed valve 40 and the position of the injection pipe 50 as in the above description. The discharge pipe 30 may also be installed in the same manner as described above.

Even when the reed valve 40 is installed to the discharge port 24 formed in the fixed scroll 18, the refrigerant blown out from the discharge port 24 does not directly hit the injection pipe 50, so the refrigerant flowing inside the injection pipe 50 is It is hard to be heated. As a result, the inside of the compression chamber 20 can be appropriately cooled by the refrigerant that passes through the injection pipe 50 and is supplied to the compression chamber 20, and the performance degradation of the compressor can be prevented.

DESCRIPTION OF SYMBOLS 1: Sealed scroll compressor 2: Sealed housing 3: Discharge cover 4: Upper cover 5: Discharge chamber 6: Upper bearing member 6A: Journal bearing portion 6B: Thrust bearing portion 7: Scroll compression mechanism 8: Stator 8A: Stator winding Line 9: Rotor 10: Electric motor 11: Crankshaft 12: Crank pin 13: Lower journal bearing 14: Displacement type oil pump 15: Lubricant oil 16: Suction pipe 17: Flow passage 18: Fixed scroll 18A: End plate 18B: Swirl 19: end plate 19B: spiral wrap 19C: bearing boss 20: compression chamber 21: rotation preventing mechanism 22: drive bush 24: discharge port 25: tip seal 26: tip seal 27: suction pipe 28: Inlet 29: Discharge Port 30: Discharge pipe 40: Reed valve 41: Retainer 42: Bolt 50: Injection pipe

Claims

With the housing,
A scroll type compression mechanism housed in the housing;
A discharge cover provided with a discharge port through which the refrigerant compressed by the compression mechanism passes, or a fixed scroll of the compression mechanism;
A discharge chamber formed between the housing and the discharge cover or the fixed scroll;
A piping portion which passes through the inside of the discharge chamber and through which the refrigerant flows;
A reed valve provided at the discharge port of the discharge cover or the fixed scroll and having a configuration in which a refrigerant discharged from the discharge port to the discharge chamber is blown out in a direction away from the piping section;
A compressor comprising:
The reed valve has a plate-like member for blowing out the refrigerant discharged from the discharge port in a predetermined blowing direction,
The said piping part is a compressor of Claim 1 provided in the back side of the said blowing direction.
The plate-like member of the reed valve is long in one direction, one end is fixed to the discharge cover or the fixed scroll, and the other end can be opened and closed with respect to the discharge port,
The compressor according to claim 2, wherein a line connecting the one end and the other end of the plate-like member and a line connecting the discharge port and the piping portion are 90 ° or less.
The plate-like member of the reed valve is long in one direction, one end is fixed to the discharge cover or the fixed scroll, and the other end can be opened and closed with respect to the discharge port,
When the two discharge ports are provided and one reed valve is provided for each of the discharge ports,
The compressor according to claim 2, wherein the plate-like members of the two reed valves are installed to sandwich the pipe portion.
The compressor according to claim 4, wherein the piping unit is installed on a perpendicular bisector of a line segment connecting two of the discharge ports.
The angle between the line connecting the one end and the other end of one plate member and the line connecting the one end and the other end of the other plate member is 90 ° or less. The compressor as described in.
It further comprises a discharge pipe installed through the housing and discharging the refrigerant in the discharge chamber to the outside,
The discharge pipe is installed such that the refrigerant discharged from the discharge port to the discharge chamber is blown out in the direction approaching the discharge pipe by the reed valve. Description compressor.
It further comprises a discharge pipe installed through the housing and discharging the refrigerant in the discharge chamber to the outside,
The discharge pipe is installed such that the refrigerant discharged from the discharge port to the discharge chamber is blown by the reed valve in the direction approaching the discharge pipe, and the discharge pipe includes two discharge ports. The compressor according to any one of claims 4 to 6, wherein the compressor is installed on the opposite side of the pipe section with a line connecting the two.