EP3330544A1

EP3330544A1 - Compressor

Info

Publication number: EP3330544A1
Application number: EP17203559.4A
Authority: EP
Inventors: Shunsuke Yakushiji
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2016-11-30
Filing date: 2017-11-24
Publication date: 2018-06-06
Also published as: JP2018091165A

Abstract

The compressor includes a discharge valve mechanism (B) which, according to a pressure difference between one side (21) and the other side (22) communicating with each other through a discharge port (23), automatically opens and closes a discharge opening (24) which opens to the other side (22) of the discharge port (23), in which the discharge valve mechanism (B) includes a valve body (25) which is elastically deformed as a pressure of the one side (21) is greater than a pressure of the other side (22) to open the discharge opening (24) and is returned to an original state as the pressure of the one side (21) is less than or equal to the pressure of the other side (22) to close the discharge opening (25), and a wall portion (30) which protrudes from one surface (17a) of the other side (22) on which the discharge opening (24) is formed and is provided around the discharge opening (24) and the valve body (25).

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a compressor.

Description of Related Art

A compressor for compressing a fluid such as a refrigerant is provided in an air conditioner, a refrigerator, or the like.
In addition, a scroll compressor, a rotary compressor, or the like is applied to this kind of compressor.
For example, a scroll compressor is configured to include a cylindrical housing body, a housing which includes an upper cover and a lower cover closing an upper opening and a lower opening of the housing body, a discharge cover which partitions the inside of the housing to form a discharge chamber on the upper side, a scroll compression mechanism which is accommodated in the housing and compresses a fluid such as a refrigerant introduced into the housing through a suction pipe by a revolution turning motion of a turning scroll with respect to a fixed scroll, and an electric motor and a rotary shaft for performing the turning scroll on the revolution turning motion (for example, refer to Patent Document 1 and Patent Document 2).
In the discharge cover, a discharge port is formed to penetrate the discharge cover so as to cause a compression chamber (one side) on the scroll compression mechanism side and a discharge chamber (the other side) to communicate with each other. In addition, the scroll compressor includes a valve body and a discharge valve mechanism having the valve body, in which the valve body prevents a compressed fluid from flowing backward from the discharge chamber to the compression chamber by automatically opening and closing a discharge opening which opens to the discharge chamber side of the discharge cover according to a compression event during one rotation of the turning scroll, that is, according to a pressure difference between the compression chamber and the discharge chamber.
In the scroll compressor, the rotary shaft is rotated by the electric motor, the turning scroll of the scroll compression mechanism performs the revolution turning motion, and thus, the fluid such as the refrigerant introduced from the suction pipe into the housing is compressed in the compression chamber, and the compressed fluid (high-temperature and high-pressure compressed gas) is generated.
If a pressure in the compression chamber is higher than that in the discharge chamber, the valve body (reed valve body) is pushed up by this pressure difference to open the discharge opening of the discharge port, and thus, the compressed fluid is ejected to the discharge chamber through the discharge port and the discharge opening to be fed to the discharge chamber. In addition, for example, the compressed fluid is discharged to a refrigerating cycle side, to which the scroll compressor is connected, through the discharge pipe from the discharge chamber to be fed to the refrigerating cycle side.

Patent Document 1: Japanese Unexamined Patent Application, First Publication No. 2014-040827
Patent Document 2: Japanese Unexamined Patent Application, First Publication No. 2013-167215

SUMMARY OF THE INVENTION

However, in the conventional compressor, the reed valve body closes the discharge opening when the compression event ends. However, when the reed valve body closes the valve, the pressure difference between the compression chamber on the one side and the discharge chamber on the other side decreases, and thus, a portion of the compressed fluid such as the refrigerant may instantaneously flow backward through a gap between the reed valve body and the discharge opening, and there is a concern that compression efficiency decreases due to the backflow of the compressed fluid.
In addition, pressure pulsation is generated by the backflow of the compressed fluid such as a refrigerant, and thus, pulsating sound (noise) may be generated.
Moreover, the reed valve body is opened and closed according to the pressure difference between the compression chamber on the one side and the discharge chamber on the other side, and the compressed fluid is discharged in only one direction limited from the compression chamber to the discharge chamber. Accordingly, a choke flow is generated when the reed valve body opens the discharge opening to eject the compressed fluid from the discharge port to the discharge chamber, and thus, there is a concern that compression efficiency decreases.
According to an aspect of the present invention, there is provided a compressor including: a discharge valve mechanism which, according to a pressure difference between one side and the other side communicating with each other through a discharge port, automatically opens and closes a discharge opening which opens to the other side of the discharge port, in which the discharge valve mechanism includes a valve body which is elastically deformed as a pressure of the one side is greater than a pressure of the other side to open the discharge opening and is returned to an original state as the pressure of the one side is less than or equal to the pressure of the other side to close the discharge opening, and a wall portion which protrudes from one surface of the other side on which the discharge opening is formed and is provided around the discharge opening and the valve body.
In addition, in the compressor of the present invention, preferably, the wall portion is disposed in a vortex flow generation region in which the discharge opening is opened and a compressed fluid discharged from the one side to the other side becomes a vortex flow.
Moreover, in the compressor of the present invention, the valve body may be a reed valve body in which one end portion is fixed and the discharge opening is opened and is closed on the other end side, and a disposition and/or a height of the wall portion may be set according to a lift amount of the reed valve body in a longitudinal direction along the other end of the reed valve body from the one end thereof when the discharge opening is opened.
In addition, in the compressor of the present invention, the discharge valve mechanism may include a recessed portion which is recessed on one surface on the other side on which the discharge opening is formed and is provided around the discharge opening and the valve body.
According to another aspect of the present invention, there is provided a compressor including: a discharge valve mechanism which, according to a pressure difference between one side and the other side communicating with each other through a discharge port, automatically opens and closes a discharge opening which opens to the other side of the discharge port, in which the discharge valve mechanism includes a valve body which is elastically deformed as a pressure of the one side is greater than a pressure of the other side to open the discharge opening and is returned to an original state as the pressure of the one side is less than or equal to the pressure of the other side to close the discharge opening, and a recessed portion which is recessed on one surface on the other side on which the discharge opening is formed and is provided around the discharge opening and the valve body.
In the compressor of the present invention, the wall portion and/or the recessed portion is provided around the discharge opening and the valve body. Accordingly, at the time of a valve close at which the valve body elastically deformed according to a pressure difference between the one side and the other side to open the discharge opening returns to the original state to close the discharge opening, a backflow of the compressed fluid instantaneously generated from the other side to the one side can be suppressed (prevented) by the wall portion or the recessed portion.
Accordingly, compared to the conventional compressor, it is possible to increase generation efficiency of the compressed fluid, and it is possible to prevent the occurrence of the pulsation caused by the backflow of the compressed fluid and the occurrence of noise caused by the pulsation.
In addition, the flow of the compressed fluid can be controlled by the wall portion or the recessed portion, and thus, it is possible to prevent the occurrence of the choke flow. From this, it is possible to prevent the decrease in the generation efficiency of the compressed fluid.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal section view showing a compressor according to first and second embodiments of the present invention.
FIG. 2 is a longitudinal section view showing a discharge valve mechanism according to the first embodiment of the present invention.
FIG. 3 is a view taken along line X1-X1 of FIG. 2 and is a cross sectional view showing the discharge valve mechanism according to the first embodiment of the present invention.
FIG. 4 is a longitudinal section view showing a modification example of the discharge valve mechanism according to the first embodiment of the present invention.
FIG. 5 is a longitudinal section view showing a conventional discharge valve mechanism.
FIG. 6 is a view taken along line X1-X1 of FIG. 5 and a cross sectional view showing the conventional discharge valve mechanism.
FIG. 7 is a longitudinal section view showing another modification example of the discharge valve mechanism according to the first embodiment of the present invention.
FIG. 8 is a view from line X1-X1 of FIG. 7 and a plan view showing another modification example of the discharge valve mechanism according to the first embodiment of the present invention.
FIG. 9 is a longitudinal section view showing a discharge valve mechanism according to the second embodiment of the present invention.
FIG. 10 is a view from line X1-X1 of FIG. 9 and a plan view showing the discharge valve mechanism according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a compressor according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 8.
Here, in the present embodiment, the compressor according to the present invention will be described as being a vertical type scroll compressor provided in an air conditioner, a refrigerator, or the like.
As shown in FIG. 1, a compressor A of the present embodiment is configured to include a housing 1, an electric motor 2 provided in the housing 1, and a scroll compression mechanism 3 which is provided in the housing 1 and compresses a fluid such as a refrigerant by driving of the electric motor 2.
The housing 1 is formed to include a cylindrical housing body 1a, an upper cover 1b which closes an upper end opening of the housing body 1a, and a lower cover 1c which closes a lower end opening of the housing body 1a. In the housing 1, a suction pipe 4 for supplying a fluid such as refrigerant from an accumulator or the like into the housing 1 is provided on a side surface of the housing body 1a, and a discharge pipe 5 for discharging the fluid compressed by the scroll compression mechanism 3 to the outside is provided on the upper cover 1b.
The electric motor 2 includes a stator 6 and a rotor 7 and is configured to supply power from a power source to the stator 6 and rotate the rotor 7 in one direction around an axis O1 extending an up-down direction S1.
In addition, a rotary shaft 8 is integrally attached to the rotor 7 such that the axis O1 direction is the up-down direction S1. An upper end side of the rotary shaft 8 in the axis O1 direction is pivotally supported by an upper bearing 10, a lower end side thereof in the axis O1 direction is pivotally supported by a lower bearing 11, and thus, the rotary shaft 8 is provided to rotate around the axis O1 according to the rotation of the rotor 7. The upper bearing 10 and the lower bearing 11 are each provided to be integrally fixed to the housing body 1a.
An eccentric pin 12 which has an axis O2 oriented in the up-down direction S1 and is eccentric (offset) with respect to the axis O1 of the rotary shaft 8 is integrally provided on the upper end portion of the rotary shaft 8.
The scroll compression mechanism 3 includes a fixed scroll 15, a turning scroll 16 which revolves around the fixed scroll 15, a discharge cover 17, and a discharge valve mechanism B.
The fixed scroll 15 is formed to include a disk-shaped end plate 15a and a fixed lap 15b which protrudes downward from the lower surface of the end plate 15a and is spirally provided. The fixed scroll 15 is joined to the upper bearing 10 by a bolt or the like and is disposed to be fixed to the inside of the housing 1. Moreover, a communication hole 18 which is formed to penetrate an upper surface of the end plate 15a from a lower surface thereof is provided in the fixed scroll 15.
The turning scroll 16 is formed to include a disk-shaped end plate 16a and a turning lap 16b which protrudes upward from the upper surface of the end plate 16a and is spirally disposed.
In addition, a boss 20 is integrally provided on a lower surface (rear surface) of the end plate 16a of the turning scroll 16, and a drive bush is assembled to the boss 20 via a bearing.
The eccentric pin 12 is fitted into the drive bush. Accordingly, the turning scroll 16 is eccentrically connected to the rotary shaft 8, and is provided to rotate (revolve) with an eccentric distance from the axis (axis center) O1 of the rotary shaft 8 as a radius according to the rotation of the rotary shaft 8 around the axis O1. In addition, a rotation restraining member such as an Oldham ring is provided between the turning scroll 16 and the rotary shaft 8 such that the turning scroll 16 revolves and does not rotate.
The fixed scroll 15 and the turning scroll 16 are disposed such that the fixed lap 15b and the turning lap 16b mesh with each other so as to overlap each other vertically. In this case, the fixed scroll 15 and the turning scroll 16 are eccentric to each other by a predetermined amount and are provided such that the fixed lap 15b and the turning lap 16b mesh with each other by shifting the phase by 180°. In addition, the fixed lap 15b and the turning lap 16b are disposed to come into contact with each other at a plurality of locations according to a rotation angle of the turning scroll 16.
Moreover, a portion between a lower surface of the fixed scroll 15 and an upper surface of the turning scroll 16, that is, a portion in which the fixed lap 15b and the turning lap 16b mesh with each other becomes a compression chamber 21 in which a fluid such as a refrigerant is compressed. In the scroll compression mechanism 3 of the present embodiment, the compression chamber 21 is formed point symmetrically with respect to the central portion (innermost peripheral portion) of the spiral of the fixed lap 15b and the turning lap 16b, the fluid gradually moves to the inner peripheral side while a volume of the fluid decreases according to the turning of the turning scroll 16, and thus, the fluid is compressed maximally at the center portion of the spiral.
The discharge cover 17 is disposed above the fixed scroll 15 and is provided so as to divide the inside of the housing 1 into an upper discharge chamber 22 to which the discharge pipe 5 is connected and a lower space (compression chamber 21) to which the suction pipe 4 is connected.
As shown in FIGS. 1, 2, 3, and 4, the discharge valve mechanism B of the present embodiment includes a discharge port 23 which is formed to penetrate an upper surface (one surface) of the discharge cover 17 from a lower surface thereof and causes the compression chamber 21 and the discharge chamber 22 to communicate with each other through a communication hole 18 formed to penetrate the end plate 15a of the fixed scroll 15, and a valve body 25 which opens and closes a circular discharge opening 24 formed so as to open to an upper surface (one surface) 17a of the discharge cover 17 of the discharge port 23 according to a pressure difference between the compression chamber 21 and the discharge chamber 22.
The valve body 25 is a reed valve body, one end (base end) 25a side of the valve body 25 is fixed to the upper surface 17a of the discharge cover 17, and the other end (tip) 25b side thereof overlaps the discharge opening 24 in the up-down direction S1 to close the discharge opening 24.
The valve body 25 has the one end 25a side which is a portion fixed to the discharge cover 17 as a supporting point, and when the pressure in the compression chamber 21 is equal to or less than the pressure in the discharge chamber 22, the other end 25b side closes the discharge opening 24. In addition, when the pressure in the compression chamber 21 is larger than the pressure in the discharge chamber 22, the valve body 25 is elastically deformed by the pressure difference with the one end 25a side which is a portion fixed to the discharge cover 17 as a supporting point, the other end 25b side is lifted upward to open the discharge opening 24, and thus, a compressed fluid R is fed from the compression chamber 21 to the discharge chamber 22 through the discharge opening 24. Moreover, the valve body 25 opens the discharge opening 24 to feed the compressed fluid R to the discharge chamber 22, and if the pressure in the compression chamber 21 is equal to or less than the pressure in the discharge chamber 22, the valve body 25 lowers the other end 25b side to the original state to close the discharge opening 24.
That is, the valve body 25 automatically opens and closes the discharge opening 24 according to the pressure difference between the compression chamber 21 and the discharge chamber 22 to feed the compressed fluid R from the compression chamber 21 to the discharge chamber 22.
Moreover, in the present embodiment, the discharge cover 17 includes a valve seat 17b which protrudes upward from the upper surface (one surface) 17a of the discharge cover 17 to surround the circular discharge opening 24 and is connected in an annular shape, and a lower surface of the valve body 25 comes into close contact with an upper end of the valve seat 17b in the protrusion direction to close the discharge opening 24.
In addition, in the present embodiment, a retainer 26 is provided, which has one end side is supported to be fixed to the discharge cover 17, is inclined upward toward the other end side, and overlap the valve body 25 and the discharge opening 24 above these. The retainer 26 abuts on the valve body 25 when the valve body 25 is elastically deformed by the pressure difference and is lifted up, and thus, regulates further lift-up of the valve body 25. That is, the retainer 26 is formed at a predetermined inclination angle from the one end side toward the other end side, and thus, is provided to regulate a lift amount at each position of the portions of the valve body 25, which are elastically deformed from the one end 25a side to the other end 25b and are lifted up, in a longitudinal direction S2.
Accordingly, the discharge valve mechanism B of the present embodiment is configured such that the valve body 25 is not excessively deformed elastically when opening the discharging opening 24.
In the compressor A of the present embodiment configured as described above, for example, when the operation of the compressor A is controlled by a controller provided in the air conditioner or the refrigerator and the compressor A starts, the electric motor 2 is energized by the controller and a fluid such as a refrigerant is introduced into the housing 1 through the suction pipe 4.
If the electric motor 2 is energized, the rotary shaft 8 rotates, and the turning scroll 16 performs a revolution turning motion with respect to the fixed scroll 15. Accordingly, the fluid such as the refrigerant is compressed in the compression chamber 21 between the turning scroll 16 and the fixed scroll 15. In addition, the fluid is compressed by the revolution turning motion of the turning scroll 16, and the fluid is sequentially sucked from the suction pipe 4 into the housing 1, and from the outer peripheral portions of the turning scroll 16 and the fixed scroll 15 to the portion between the turning scroll 16 and the fixed scroll 15.
In addition, the compressed fluid R which is compressed maximally in the compression chamber 21 formed at the center portion of the spiral flows through the communication hole 18 and the discharge port 23 to push up the valve body 25 of the discharge valve mechanism B, and the compressed fluid R is fed to be ejected into the discharge chamber 22 from the discharge opening 24 which is opened by pushing up the valve body 25. Moreover, the compressed fluid R is discharged to an external refrigerant circuit or the like through the discharge pipe 5 from the discharge chamber 22. In this case, the fluid in the compression chamber 21 of the center portion of the spiral is discharged until the pressures in the compression chamber 21, the communication hole 18, and the discharge port 23 are balanced with the pressure in the discharge chamber 22.
That is, if the compressed fluid R is discharged to the discharge chamber 22 and the pressure in the compression chamber 21 is equal to or less than the pressure in the discharge chamber 22, the valve body 25 is pushed down and the discharge opening 24 is automatically closed. Accordingly, until the operation of the compressor A is controlled to be stopped by the controller, the compressed fluid R having a predetermined pressure is generated by the revolution turning motion of the turning scroll 16 continued by the driving of the electric motor 2, and the discharge and the supply of the compressed fluid R with respect to the refrigerant circuit or the like are repeatedly performed.
Here, the valve body 25 is gradually pushed down as the compressed fluid R is ejected from the discharge opening 24 and the pressure difference between the compression chamber 21 and the discharge chamber 22 decreases, and the discharge opening 24 is closed when the valve body 25 abuts on the valve seat 17b.
When the discharge opening 24 is closed, as shown in FIGS. 5 and 6, a pressure balance is instantaneously lost in a state where the pressure difference between the compression chamber 21 and the discharge chamber 22 decreases and the valve body 25 does not completely close the discharge opening 24, and thus, there is a concern that a backflow of the compressed fluid R (R') from the discharge chamber 22 to the compression chamber 21 occurs. If this backflow phenomenon occurs, a decrease in a generation efficiency of the compressed fluid R is generated. In addition, there is a concern that a pressure pulsation and noise are generated by the backflow of the compressed fluid R. Moreover, when the compressed fluid R is ejected from the discharge opening 24 into the discharge chamber 22, the compressed fluid R is ejected only in certain limited direction of discharge opening 24, and thus, a choke flow easily occurs.
On the other hand, in the discharge valve mechanism B of the present embodiment, as shown in FIGS. 2, 3, and 4, a wall portion 30 which protrudes upward from the upper surface (one surface) 17a of the discharge cover 17 is provided around the discharge opening 24 and the valve body 25.
In addition, in the present embodiment, the wall portion 30 is provided in a vortex flow generation region in which the compressed fluid R which flows through the discharge port 23 and is discharged from the discharge opening 24 becomes a vortex flow when the pressure in the compression chamber 21 is larger than the pressure in the discharge chamber 22 and the compressed fluid R is fed from the discharge opening 24 opened by the elastic deformation of the valve body 25 the discharge chamber 22.
In addition, as shown in FIGS. 7 and 8, the wall portion 30 may be formed such that a height thereof is changed in the protrusion direction according to the positions around the discharge opening 24 and the valve body 25 to correspond the inclination angle of the valve body 25 elastically deformed by the pressure difference between the compression chamber 21 and the discharge chamber 22, that is, to correspond (for example, is in proportion with) the lift amount L of each position from the one end 25a side of the valve body 25 to the other end 25b thereof in the longitudinal direction S2. In other words, the wall portion 30 is not provided or the height of the wall portion 30 decreases in a portion where the backflow of the compressed fluid R is rarely generated (is not generated) or the vortex flow is rarely generated (is not generated).
In addition, as shown in FIG. 8, the valve body 25 does not need to be constricted with respect to the portion on the other end 25b side and formed with a narrower width on the one end 25a side. That is, it is not particularly necessary to limit the shape of the valve body 25.
Accordingly, in the compressor A of the present embodiment, the wall portion 30 is provided around the discharge opening 24 and the valve body 25, and thus, it is possible to suppress / prevent the occurrence of the backflow of the compressed fluid R (R') from the discharge chamber 22 to the compression chamber 21 by the wall portion 30 at a moment of valve closing at which the valve body 25 elastically deformed to open the discharge opening 24 returns the original state and the discharge opening 24 is closed.
Accordingly, compared to the conventional compressor, it is possible to increase the generation efficiency of the compressed fluid R, and it is possible to prevent the occurrence of the pulsation caused by the backflow of the compressed fluid R and the occurrence of the noise caused by the pulsation. In addition, the flow of the compressed fluid R can be controlled by the wall portion 30, and thus, it is possible to prevent the occurrence of the choke flow. From this, it is possible to suppress / prevent the decrease in the generation efficiency of the compressed fluid R.
In addition, in the compressor A of the present embodiment, the wall portion 30 is provided in the vortex flow generation region in which the compressed fluid R discharged from the discharge opening 24 becomes the vortex flow, and thus, it is possible to suppress / prevent the occurrence of the vortex flow of the compressed fluid R. Accordingly, it is possible to suppress / prevent the decrease in the generation efficiency of the compressed fluid R caused by the occurrence of the vortex flow of the compressed fluid R.
Moreover, the wall portion 30 is not provided or the height of the wall portion 30 decreases in the portion where the backflow of the compressed fluid R is rarely generated (is not generated) or the vortex flow is rarely generated (is not generated), and thus, a pressure loss caused by providing the wall portion 30 is prevented, and the above-described effects can be realized.
Hereinbefore, the first embodiment of the compressor of the present invention is described. However, the present invention is not limited to the first embodiment and can be appropriately modified within a scope which does not departed from the gist.
In the present embodiment, the case in which the compressor according to the present invention is a vertical type scroll compressor provided in an air conditioner, a refrigerator, or the like is described. However, the compressor of the present invention may be other type compressors such as a horizontal type scroll compressor or rotary compressor.
That is, the present invention may be any configuration as long as it includes the discharge valve mechanism B having the valve body 25 which opens and closes the discharge opening 24 of the discharge port 23 causing the one side 21 to communicate with the other side 22 and feeding the compressed fluid R by the pressure difference between the one side 21 and the other side 22 and the wall portion 30 for suppressing / preventing the occurrence of the backflow or the vortex flow of the compressor fluid R is provided in the discharge valve mechanism B, and particularly, there is no need to limit the type / the configuration for generating the compressed fluid R.
Moreover, even in a case where the type / the configuration for generating the compressed fluid R are different from those of the compressor A of the present embodiment, if the wall portion 30 for suppressing / preventing the occurrence of the backflow or the vortex flow of the compressed fluid R is provided in the discharge valve mechanism B, effects similar to those of the present embodiment can be obtained.
Moreover, in the present embodiment, the wall portion 30 is provided in the vortex flow generation region of the compressed fluid R. However, the wall portion 30 may be provided in the vicinity of the valve seat 17b on the other end 25b side of the valve body 25 or the like, that is, the wall portion 30 may be provided at a location at which the amount of the backflow of the compressed fluid R is large regardless of frequency of the occurrence of the vortex flow or presence or absence of the vortex flow (refer to Figs. 7 and 8). In addition, the side surface of the wall portion 30 may be formed in a multistage shape (stepwise shape) to more effectively suppress / prevent the occurrence of the backflow or the vortex flow.
Next, a compressor according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10 (FIG. 1). Next, similarly to the first embodiment, in the present embodiment, the compressor according to the present invention relates to the scroll compressor provided in an air conditioner or a refrigerator, and only a configuration of a discharge valve mechanism is different from that of the first embodiment. Accordingly, in the present embodiment, the same reference numerals are assigned to configurations similar to those of the first embodiment, and detail descriptions thereof are omitted.
Similarly to the first embodiment, the compressor A of the present embodiment is configured to include the housing 1, the electric motor 2 provided in the housing 1, and the scroll compression mechanism 3 which is provided in the housing 1 and compresses a fluid such as a refrigerant by driving of the electric motor 2.
The scroll compression mechanism 3 includes the fixed scroll 15, the turning scroll 16 which revolves around the fixed scroll 15, the discharge cover 17, and the discharge valve mechanism B.
In addition, the discharge valve mechanism B of the present embodiment includes the discharge port 23 which is formed to penetrate the upper surface 17a of the discharge cover 17 from the lower surface thereof and causes the compression chamber 21 and the discharge chamber 22 to communicate with each other through the communication hole 18 formed to penetrate the end plate 15a of the fixed scroll 15, and the valve body 25 which opens and closes the circular discharge opening 24 formed so as to open to the upper surface 17a of the discharge cover 17 of the discharge port 23 according to the pressure difference between the compression chamber 21 and the discharge chamber 22.
In the discharge valve mechanism B of the present embodiment, as shown in FIGS. 9 and 10, a recessed portion 31 which is recessed downward from the upper surface 17a of the discharge cover 17 is provided around the discharge opening 24 and the valve body 25.
Moreover, in the present embodiment, the recessed portion 31 may be formed such that a depth thereof is changed in the recessed direction according to the positions around the discharge opening 24 and the valve body 25 to correspond the inclination angle of the valve body 25 elastically deformed by the pressure difference between the compression chamber 21 and the discharge chamber 22, that is, to correspond (for example, is in proportion with) the lift amount L of each position from the one end 25a side of the valve body 25 to the other end 25b thereof in the longitudinal direction S2. In other words, the recessed portion 31 may not be provided or the depth of the recessed portion 31 may decrease in a portion where the backflow of the compressed fluid R is rarely generated (is not generated).
Accordingly, in the compressor A of the present embodiment, the recessed portion 31 is provided around the discharge opening 24 and the valve body 25, and thus, it is possible to suppress / prevent the occurrence of the backflow of the compressed fluid R from the discharge chamber 22 to the compression chamber 21 by the recessed portion 31 at a moment of valve closing at which the valve body 25 elastically deformed to open the discharge opening 24 returns the original state and the discharge opening 24 is closed.
Accordingly, compared to the conventional compressor, it is possible to increase the generation efficiency of the compressed fluid R, and it is possible to prevent the occurrence of the pulsation caused by the backflow of the compressed fluid R and the occurrence of the noise caused by the pulsation. In addition, the flow of the compressed fluid R can be controlled by the recessed portion 31, and thus, it is possible to prevent the occurrence of the choke flow. From this, it is possible to suppress / prevent the decrease in the generation efficiency of the compressed fluid R.
Moreover, the recessed portion 31 is not provided or the depth of the recessed portion 31 decreases in the portion where the backflow of the compressed fluid R is rarely generated (is not generated), and thus, a pressure loss caused by providing the recessed portion 31 is prevented, and the above-described effects can be realized.
Hereinbefore, the second embodiment of the compressor according to the present invention is described. However, the present invention is not limited to the second embodiment, can include a modification example (a modification example similar to the modification example of the first embodiment) of the first embodiment, and can be appropriately modified within the scope which does not depart from the gist.
For example, the discharge valve mechanism B which includes the wall portion 30 of the first embodiment and the recessed portion 31 of the present embodiment may be configured. For example, as shown in FIG. 10, if the wall portion 30 is provided on a T1 side and the recessed portion 31 is provided on a T2 side, the effects can be appropriately exerted.
While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims.

EXPLANATION OF REFERENCES

1: housing
1a: housing body
1b: upper cover
1c: lower cover
2: electric motor
3: scroll compression mechanism
4: suction pipe
5: discharge pipe
6: stator
7: rotor
8: rotary shaft
10: upper bearing
11: lower bearing
12: eccentric pin
15: fixed scroll
15a: end plate
15b: fixed lap
16: turning scroll
16a: end plate
16b: turning lap
17: discharge cover
17a: upper surface (one surface)
17b: valve seat
18: communication hole
20: boss
21: compression chamber (one side)
22: discharge chamber (other side)
23: discharge port
24: discharge opening
25: valve body (reed valve body)
25a: one end
25b: other end
26: retainer
30: wall portion
31: recessed portion
A: compressor
B: discharge valve mechanism
L: lift amount
O1: axis
O2: axis
R: compressed fluid
R': compressed fluid flowing backward
S1: up-down direction
S2: longitudinal direction of valve body

Claims

A compressor comprising:
a discharge valve mechanism (B) which, according to a pressure difference between one side (21) and the other side (22) communicating with each other through a discharge port (23), automatically opens and closes a discharge opening (24) which opens to the other side of the discharge port (23),

wherein the discharge valve mechanism (B) includes a valve body (25) which is configured to be elastically deformed as a pressure of the one side (21) is greater than a pressure of the other side (22) to open the discharge opening (24) and to return to an original state as the pressure of the one side (21) is less than or equal to the pressure of the other side (22) to close the discharge opening (24), and a wall portion (30) which protrudes from one surface (17a) of the other side (22) on which the discharge opening (24) is formed and is provided around the discharge opening (24) and the valve body (25).
The compressor according to claim 1,
wherein the wall portion (30) is disposed in a vortex flow generation region in which the discharge opening (24) is opened and a compressed fluid discharged from the one side (21) to the other side (22) becomes a vortex flow.
The compressor according to claim 1 or 2,
wherein the valve body (25) is a reed valve body in which one end portion is fixed and the discharge opening (24) is opened and is closed on the other end side, and a disposition and/or a height of the wall portion (30) is set according to a lift amount of the reed valve body (25) in a longitudinal direction along the other end (25b) of the reed valve body (25) from the one end (25a) thereof when the discharge opening (24) is opened.
The compressor according to any one of claims 1 to 3,
wherein the discharge valve mechanism (B) includes a recessed portion (31) which is recessed on one surface on the other side (22) on which the discharge opening (24) is formed and is provided around the discharge opening (24) and the valve body (25).
A compressor comprising:
a discharge valve mechanism (B) which, according to a pressure difference between one side (21) and the other side (22) communicating with each other through a discharge port (23), automatically opens and closes a discharge opening (24) which opens to the other side (22) of the discharge port (23),

wherein the discharge valve mechanism (B) includes a valve body (25) which is configured to be elastically deformed as a pressure of the one side (21) is greater than a pressure of the other side (22) to open the discharge opening (24) and to return to an original state as the pressure of the one side (21) is less than or equal to the pressure of the other side (22) to close the discharge opening (24), and a recessed portion (31) which is recessed on one surface on the other side (22) on which the discharge opening (24) is formed and is provided around the discharge opening (24) and the valve body (25).